CN116404322B - End cover assembly, energy storage device, power utilization system and energy storage system - Google Patents
End cover assembly, energy storage device, power utilization system and energy storage system Download PDFInfo
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- CN116404322B CN116404322B CN202310635209.4A CN202310635209A CN116404322B CN 116404322 B CN116404322 B CN 116404322B CN 202310635209 A CN202310635209 A CN 202310635209A CN 116404322 B CN116404322 B CN 116404322B
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- top cover
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- 238000004146 energy storage Methods 0.000 title claims abstract description 254
- 238000009423 ventilation Methods 0.000 claims abstract description 134
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 239000011324 bead Substances 0.000 claims description 9
- 238000003475 lamination Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 16
- 239000003792 electrolyte Substances 0.000 description 44
- 238000004880 explosion Methods 0.000 description 20
- 230000009286 beneficial effect Effects 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 238000003466 welding Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/16—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application relates to an end cover assembly, an energy storage device, an electricity utilization system and an energy storage system. The end cover assembly is provided with a top cover, an explosion-proof valve and a lower plastic assembly, the top cover is provided with an explosion-proof hole and penetrates through the first surface and the second surface, and the top cover is provided with an inner wall surrounding the explosion-proof hole; the explosion-proof valve seals the explosion-proof hole and is welded on the top cover, and comprises a deformation part and a connecting part for connecting the deformation part and the inner wall; the lower plastic component is arranged on the second surface side of the top cover; the lower plastic component and the explosion-proof valve enclose a cavity, the lower plastic component is provided with a first lower plastic part, the first lower plastic part is provided with at least one ventilation hole, the area enclosed by the orthographic projections of the ventilation holes on the second surface is a first projection, and the orthographic projection of the connecting part on the second surface is a second projection; along the extension direction of the top cover, the distance between one end of the second projection deviating from the explosion-proof hole and one end of the first projection deviating from the explosion-proof hole is L1, the length of the first projection is L2, and 1/6 is less than or equal to L1/L2 is less than or equal to 1/3. The explosion-proof valve of the end cover assembly has high reliability.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device, an electricity utilization system and an energy storage system.
Background
In the use process of the energy storage device, a large amount of gas can be generated in the energy storage device due to the fact that the energy storage device is used in an overcharged, overdischarged, short-circuited or severe environment, so that the voltage in the energy storage device is continuously increased. The explosion-proof valve is arranged at the cover of the energy storage device, and when the pressure in the energy storage device reaches a certain value, the gas can be decompressed through the explosion-proof valve so as to reduce the explosion risk of the energy storage device. However, in order to realize the insulation between the electrode assembly in the energy storage device and the top cover, a lower plastic part is generally arranged at the lower end of the top cover, the structure of the existing lower plastic part is unreasonable, when the pressure in the energy storage device reaches a certain value, the lower plastic part can block the stroke of the explosion-proof valve for the gas in the energy storage device, so that the gas in the energy storage device is blocked to the explosion-proof valve to a certain extent, the reliability of the explosion-proof valve of the energy storage device is affected, and the safety performance of the energy storage device is reduced.
Disclosure of Invention
In view of this, the application provides an end cover assembly, energy storage device, power consumption system and energy storage system, the explosion-proof valve of end cover assembly has higher reliability.
The application provides an end cover assembly, which comprises a top cover, an explosion-proof valve and a lower plastic assembly, wherein the top cover is provided with explosion-proof holes, the top cover is provided with a first surface and a second surface which are arranged in a back-to-back mode, and the explosion-proof holes penetrate through the first surface and the second surface respectively; the top cover is provided with an inner wall surrounding the explosion-proof hole; the explosion-proof valve seals the explosion-proof hole and is welded to the top cover, and comprises a deformation part and a connecting part, and the connecting part is connected with the deformation part and the inner wall; the lower plastic component is arranged on the second surface side of the top cover in a lamination mode; the lower plastic component and the explosion-proof valve enclose a cavity, the lower plastic component comprises a first lower plastic part, the first lower plastic part is provided with at least one air vent, and at least one air vent communicates the space of one side of the first lower plastic part, which is away from the top cover, with the cavity; the extending direction of the top cover is a first direction, the area surrounded by the orthographic projections of the air holes on the second surface is a first projection, and the orthographic projection of the connecting part on the second surface is a second projection; the second projection is located within the range of the first projection and the first projection projects toward a direction away from the explosion vent as compared to the second projection; along the first direction, the distance between one end of the second projection, which is away from the explosion-proof hole, and one end of the first projection, which is away from the explosion-proof hole, is L1, and the length of the first projection along the first direction is L2, wherein L1/L2 is more than or equal to 1/6 and less than or equal to 1/3.
Further, the second projection is located in the range of the first projection, the area of the overlapping part of the second projection and the first projection is S1, and the area of the first projection is S2, wherein S1/S2 is more than or equal to 1/4 and less than or equal to 1/2.
Further, the second projection is located within the range of the first projection, and an area S1 of a portion where the second projection overlaps with the first projection satisfies a range: 8mm of 2 ≤S1≤28mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The area S2 of the first projection satisfies the range: 48mm 2 ≤S2≤68mm 2 。
Further, the first projection and the second projection have an overlapping region, and a width of the overlapping region along the first direction satisfies a range: h1 is more than or equal to 1mm and less than or equal to 3.5mm.
Further, the top cover extends along the first direction, the first lower plastic part is provided with two ventilation holes, the two ventilation holes are arranged along the direction perpendicular to the first direction at intervals, the first lower plastic part comprises a first lower plastic body and a first ventilation part which are connected, the first ventilation part is provided with the ventilation holes, the first ventilation part comprises a body part, a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged at intervals on the surface of the body part, which is away from the top cover, the first protruding part is arranged around one of the two ventilation holes, the second protruding part is arranged around the other of the two ventilation holes, a gap is formed between the first protruding part and the second protruding part, and the gap is communicated with the cavity.
Further, in a direction perpendicular to the first direction, a distance H2 of a gap between the first protruding portion and the second protruding portion satisfies a range: h2 is more than or equal to 0.6mm and less than or equal to 1.5mm.
Further, along the stacking direction of the first lower plastic part and the top cover, the height d1 of the first protruding portion satisfies the following range: d1 is more than or equal to 0.8mm and less than or equal to 1.4mm, and the height d2 of the second protruding part meets the range: d2 is more than or equal to 0.8mm and less than or equal to 1.4mm.
Further, the body portion protrudes from the surface of the first lower plastic body, which faces away from the top cover, and the body portion is provided with a plurality of first ventilation holes, and the first ventilation holes are used for communicating the space of one side of the first lower plastic piece, which faces away from the top cover, with the cavity.
Further, the body portion protrudes from the surface of the first lower plastic body, which faces away from the top cover, and the body portion is provided with a plurality of first ventilation holes, and the first ventilation holes are used for communicating the space of one side of the first lower plastic piece, which faces away from the top cover, with the cavity.
Further, the first lower plastic part further comprises a convex rib part, the convex rib part is arranged on the surface of the first lower plastic body, which is away from the top cover, the convex rib part is connected with the body part, the convex rib part extends along a second direction, and the second direction is intersected with the first direction; the surface of the first lower plastic body, which is away from the convex rib part, is provided with a groove corresponding to the convex rib part, and the groove extends along the second direction.
Further, along the lamination direction of the first lower plastic part and the top cover, the height d3 of the convex rib part satisfies the following range: d3 is more than or equal to 0.2mm and less than or equal to 0.5mm.
Further, the lower plastic component further comprises a second lower plastic part, the second lower plastic part and the first lower plastic part are arranged on the same side of the top cover at intervals, the second lower plastic part comprises a second lower plastic body and a second ventilation part which are connected, the second ventilation part is arranged at one end, close to the first lower plastic part, of the second lower plastic body, and the second ventilation part communicates the space, away from one side of the top cover, of the second lower plastic part with the cavity; the second ventilation part is provided with a plurality of second ventilation holes, and the second ventilation holes are used for communicating the space of one side, deviating from the top cover, of the second lower plastic part with the cavity.
Further, the first lower plastic part comprises a first lower plastic body and a first ventilation part which are connected, the first ventilation part comprises a body part, a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged at intervals on the surface of the body part, which is away from the top cover, the first protruding part and the second protruding part are all arranged around the ventilation holes, the second ventilation part is provided with a third surface facing the top cover, the second lower plastic part faces the direction of the first lower plastic part, the distance between the third surface and the second surface is gradually increased, one end of the third surface, which is close to the first lower plastic part, is far away from the top cover compared with the surface of the first protruding part, and the surface of the first ventilation part, which is away from the top cover, is far away from the surface of the top cover compared with the surface of the second protruding part, so that the gap between the first protruding part and the second protruding part is communicated with the cavity.
Further, the top cover extends along a first direction, the second ventilation part comprises a first ventilation sub-part, a second ventilation sub-part and a third ventilation sub-part which are connected, the second ventilation sub-part and the third ventilation sub-part are arranged at intervals, a part of the first ventilation sub-part penetrates through the second ventilation sub-part and the third ventilation sub-part and is respectively connected with the second ventilation sub-part and the third ventilation sub-part, and the first ventilation sub-part, the second ventilation sub-part and the third ventilation sub-part are all provided with the second ventilation holes; the surface of the first air permeable sub-portion facing away from the top cover is further from the top cover than the surface of the second air permeable sub-portion facing away from the top cover and further from the top cover than the surface of the third air permeable sub-portion facing away from the top cover.
Further, the first ventilation sub-portion comprises a first portion and a second portion which are connected, the second ventilation sub-portion, the second portion and the third ventilation sub-portion are sequentially arranged and sequentially connected, and are located at one side of the first portion, which is away from the first lower plastic part, and one end of the second portion, which is away from the first portion, is connected with the second lower plastic body; and the two opposite ends of the first part are respectively connected with the second lower plastic body along the extending direction vertical to the top cover.
The application also provides an energy storage device, which comprises an electrode assembly, a switching assembly and an end cover assembly, wherein the switching assembly is positioned on one side of the electrode assembly and is electrically connected with the electrode assembly; the end cover assembly is arranged on one side, away from the electrode assembly, of the switching assembly and is electrically connected with the switching assembly.
The application also provides an electricity utilization system, the electricity utilization system comprises electric equipment and the energy storage device provided by the application, and the energy storage device supplies power for the electric equipment.
The application also provides an energy storage system comprising a user load, an electric energy conversion device and the energy storage device provided by the application; the electric energy conversion device is used for converting other forms of energy into electric energy, the electric energy conversion device is electrically connected with the user load, and the electric energy converted by the electric energy conversion device is used for supplying power for the user load; the energy storage device is respectively and electrically connected with the user load and the electric energy conversion device, stores the electric energy converted by the electric energy conversion device, and supplies power for the user load.
In this embodiment, the lower plastic component with the explosion-proof valve encloses into the cavity, just the bleeder vent will first lower plastic part deviates from the space of one side of top cap with the cavity intercommunication, works as the end cover component assembles in energy memory and the inside pressure of energy memory is greater than certain value, gaseous accessible bleeder vent follow first lower plastic part deviates from one side of top cap circulate to the cavity for gaseous can trigger the explosion-proof valve, realize will the inside unnecessary gas of energy memory is excreted to energy memory's outside, can prevent the inside pressure of energy memory continues to increase, is favorable to improving energy memory's security performance. In addition, the second projection is located in the range of the first projection, then the orthographic projection of bleeder vent in the second surface falls into the orthographic projection range of connecting portion in the second surface, so that when the end cover subassembly is assembled in energy storage device and the energy storage device is full of electrolyte, when the energy storage device falls or shakes, electrolyte is towards the side that is close to the top cap to strike, electrolyte will pass the bleeder vent strikes connecting portion, connecting portion have stronger impact strength, can prevent that electrolyte direct impact explosion valve makes explosion valve explode, can avoid the mistake triggering explosion valve improves explosion valve's reliability. In addition, along the first direction, the distance between one end of the second projection, which is away from the explosion-proof hole, and one end of the first projection, which is away from the explosion-proof hole, is L, and the length of the first projection along the first direction is L2, wherein 1/6 is less than or equal to L1/L2 is less than or equal to 1/3, then the second projection is closer to one end of the first projection, which is away from the explosion-proof hole, so that when the energy storage device falls or vibrates, electrolyte impacts towards one side, which is close to the top cover, and the electrolyte passes through the ventilation holes to impact the connecting part, and the connecting part has stronger impact strength, so that the electrolyte can be prevented from directly impacting the explosion-proof valve to enable the explosion-proof valve to be exploded, the false triggering of the explosion-proof valve can be avoided, and the reliability of the explosion-proof valve is improved; in addition, when the end cover assembly is assembled in the energy storage device and the pressure inside the energy storage device is greater than a certain value, gas can circulate to the cavity through the air holes from one side, deviating from the top cover, of the first lower plastic part, so that the gas can trigger the explosion-proof valve, the effect of discharging redundant gas inside the energy storage device to the outside of the energy storage device is achieved, the pressure inside the energy storage device can be prevented from being continuously increased, and the safety performance of the energy storage device is improved. When the value of L1/L2 is greater than 1/3, then the second projection deviates from the one end of explosion-proof hole with the first projection deviates from the distance between the one end of explosion-proof hole is L too big, perhaps first projection is followed the length in first direction is too little, when the end cover subassembly is assembled in energy memory and the inside pressure of energy memory is greater than certain value, gaseous through the bleeder vent follow one side that first lower plastic part deviates from the top cap is circulated to the cavity, most gaseous will directly strike connecting portion and the top cap is faced towards the surface of first lower plastic part, and little gaseous direct impact explosion-proof valve makes the explosion-proof valve of being difficult to trigger, and the inside unnecessary gas of energy memory is difficult to excrete to the outside of energy memory, the inside pressure of energy memory continues to increase, has reduced the security performance of energy memory. When the value of L1/L2 is smaller than 1/6, the distance between one end of the second projection deviating from the explosion-proof hole and one end of the first projection deviating from the explosion-proof hole is L too small, or the length of the first projection along the first direction is too large, when the energy storage device falls or vibrates, electrolyte impacts towards one side close to the top cover, the electrolyte directly impacts the connecting portion and the explosion-proof valve through the air holes, so that false triggering occurs when the explosion-proof valve is opened, and the reliability of the explosion-proof valve is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the examples of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present disclosure;
FIG. 2 is a circuit block diagram of an energy storage system according to an embodiment of the present application;
FIG. 3 is a schematic structural view of an end cap assembly according to an embodiment of the present application;
FIG. 4 is a schematic exploded view of an end cap assembly according to one embodiment of the present application;
FIG. 5 is a cross-sectional view of an end cap assembly of an embodiment of the present application taken along the direction A-A in FIG. 3;
FIG. 6 is an enlarged view of an end cap assembly of an embodiment of the present application taken along dashed line box B in FIG. 5;
FIG. 7 is a cross-sectional view of a further embodiment of the end cap assembly of the present application taken along the direction A-A in FIG. 3;
FIG. 8 is an enlarged view of an end cap assembly of an embodiment of the present application taken along dashed line box C in FIG. 7;
FIG. 9 is a schematic diagram illustrating a positional relationship between a first projection and a second projection according to an embodiment of the present disclosure;
FIG. 10 is a schematic structural view of a first lower plastic member according to an embodiment of the present disclosure;
FIG. 11 is an enlarged view of a first lower plastic member along the dashed line I in FIG. 10 according to an embodiment of the present invention;
FIG. 12 is a schematic view of a first lower plastic part according to another embodiment of the present disclosure;
FIG. 13 is an enlarged view of a first lower plastic member along the dashed line D in FIG. 12 according to an embodiment of the present invention;
FIG. 14 is a cross-sectional view of a first lower plastic part according to one embodiment of the present application along the direction E-E in FIG. 10;
FIG. 15 is an enlarged view of a first lower plastic member along the dashed line F in FIG. 14 according to an embodiment of the present application;
FIG. 16 is a schematic view of a first lower plastic part according to an embodiment of the disclosure;
FIG. 17 is a cross-sectional view of a first lower plastic member according to one embodiment of the present invention along the direction G-G in FIG. 16;
FIG. 18 is a schematic structural view of a second lower plastic part according to an embodiment of the present disclosure;
FIG. 19 is a schematic view of a second lower plastic part according to another embodiment of the disclosure;
FIG. 20 is an enlarged view of a second lower plastic part along the dashed line H in FIG. 18 according to an embodiment of the present disclosure;
FIG. 21 is a schematic structural diagram of an energy storage device according to an embodiment of the present disclosure;
FIG. 22 is a schematic diagram of an exploded structure of an energy storage device according to an embodiment of the present disclosure;
FIG. 23 is a circuit block diagram of an electrical power utilization system according to an embodiment of the present application;
fig. 24 is a schematic structural diagram of an electrical power consumption system according to an embodiment of the present application.
Reference numerals illustrate:
100-end cap assembly, 110-top cap, 111-explosion vent, 112-first surface, 113-second surface, 114-inner wall, 120-explosion vent, 121-connection, 1211-second projection, 122-deformation, 1221-weld, 1222-stiffener, 130-first lower plastic piece, 131-vent, 1311-first projection, 132-first lower plastic body, 133-first venting portion, 1331-body portion, 1332-first protrusion, 1333-second protrusion, 1334-gap, 134-first vent, 135-bead, 136-groove, 137-boss, 140-chamber, 150-post, 151-metal press block, 160-second lower plastic part, 161-second lower plastic body, 162-second ventilation part, 1621-first ventilation sub-part, 1621 a-first part, 1621 b-second part, 1622-second ventilation sub-part, 1623-third ventilation sub-part, 163-second ventilation hole, 164-third surface, 170-lower plastic component, 180-protection sheet, 200-energy storage device, 210-electrode component, 220-switching component, 230-housing, 231-housing cavity, 300-electricity utilization system, 310-electricity utilization device, 400-energy storage system, 410-electric energy conversion device, 420-user load.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the use process of the energy storage device, a large amount of gas can be generated in the energy storage device due to the fact that the energy storage device is used in an overcharged, overdischarged, short-circuited or severe environment, so that the voltage in the energy storage device is continuously increased. The explosion-proof valve is arranged at the cover of the energy storage device, and when the pressure in the energy storage device reaches a certain value, the gas can be decompressed through the explosion-proof valve so as to reduce the explosion risk of the energy storage device.
In order to realize the insulation between the electrode assembly in the energy storage device and the top cover, a lower plastic part is generally arranged at the lower end of the top cover, the structure of the existing lower plastic part is unreasonable, when the pressure in the energy storage device reaches a certain value, the lower plastic part can block the stroke of the explosion-proof valve towards the gas in the energy storage device, the gas in the energy storage device is blocked towards the explosion-proof valve to a certain extent, the reliability of the explosion-proof valve of the energy storage device is affected, and the safety performance of the energy storage device is reduced. In addition, in order to be convenient for pressure release ventilative, set up the bleeder vent in the plastic main part down generally, but electrolyte is easy to pass through the bleeder vent of plastic down upwards and is strikeed to the explosion-proof valve, leads to the explosion-proof valve to open the valve in advance, has reduced the reliability of explosion-proof valve in turn for the explosion-proof valve can't provide short-circuit protection for energy memory.
Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. At present, the main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources,
At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.
Taking electrochemical energy storage as an example, the scheme provides an energy storage device, wherein a chemical battery is arranged in the energy storage device, chemical elements in the battery are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.
The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:
(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;
(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an energy storage system 400 according to an embodiment of the present application, and the embodiment of fig. 1 of the present application is illustrated by taking a user energy storage scenario in user side energy storage as an example, and the energy storage device 200 of the present application is not limited to the user energy storage scenario.
The application provides an energy storage system 400, the energy storage system 400 is a household energy storage system 400, the energy storage system 400 comprises an electric energy conversion device 410, a user load 420 and an energy storage device 200, the electric energy conversion device 410 is respectively electrically connected with the user load 420 and the energy storage device 200, the electric energy conversion device 410 is used for converting other forms of energy into electric energy, a part of the electric energy converted by the electric energy conversion device 410 is stored in the energy storage device 200, a part of the electric energy is used for supplying power to the user load 420, and the energy storage device 200 is used for storing the electric energy and supplying power to the user load 420 at the time of electricity price peak. The energy storage system 400 can both convert other energy formed into electrical energy and store electrical energy in the energy storage device 200 to provide sufficient electrical energy to the consumer load 420. The energy storage device 200 has high safety performance, which is beneficial to improving the safety performance of the energy storage device 200.
It will be appreciated that in the energy storage system 400, the power conversion device 410, the user load 420, and the energy storage device 200 are electrically connected to each other.
Optionally, the electric energy conversion device 410 may convert at least one of solar energy, light energy, wind energy, heat energy, tidal energy, biomass energy, mechanical energy, etc. into electric energy, and provide a stable power source for the user load 420 and the energy storage device 200.
Alternatively, the energy storage device 200 is a small-sized energy storage box, and may be mounted on an outdoor wall in a wall-hanging manner.
Alternatively, the power conversion device 410 may be a photovoltaic panel, which may convert solar energy into electric energy during the electricity price off-peak period and store the electric energy in the energy storage device 200.
Alternatively, the consumer load 420 may be a street lamp or a household appliance, etc., and the energy storage device 200 is used to store the electric energy and supply the street lamp and the household appliance for use at the time of peak electricity prices, or supply the electric power at the time of power outage/power failure of the power grid.
It is understood that the energy storage device 200 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. When the energy storage device 200 is a single battery, the energy storage device 200 may be at least one of a cylindrical battery, a prismatic battery, and the like.
Referring to fig. 3 to 9, an end cap assembly 100 is provided in the embodiment of the present application, the end cap assembly 100 includes a top cap 110, an explosion-proof valve 120, and a lower plastic assembly 170, the top cap 110 has an explosion-proof hole 111, the top cap 110 has a first surface 112 and a second surface 113 disposed opposite to each other, the top cap 110 has an inner wall 114 surrounding the explosion-proof hole 111, and the explosion-proof hole 111 penetrates through the first surface 112 and the second surface 113 respectively; the explosion-proof valve 120 seals the explosion-proof hole 111, the explosion-proof valve 120 is welded to the top cover 110, the explosion-proof valve 120 includes a deformation portion 122 and a connection portion 121, and the connection portion 121 connects the deformation portion 122 and the inner wall 114; the lower plastic component 170 is stacked on the second surface 113 side of the top cover 110; the lower plastic component 170 and the explosion-proof valve 120 enclose a chamber 140, the lower plastic component 170 includes a first lower plastic part 130, the first lower plastic part 130 has at least one ventilation hole 131, and at least one ventilation hole 131 communicates a space of a side of the first lower plastic part 130 facing away from the top cover 110 with the chamber 140; the extending direction of the top cover 110 is a first direction (as shown by X in fig. 5), the area surrounded by the orthographic projections of the ventilation holes 131 on the second surface 113 is a first projection 1311, and the orthographic projection of the connection portion 121 on the second surface 113 is a second projection 1211; the second projection 1211 is located within the range of the first projection 1311 and the first projection 1311 projects in a direction away from the explosion vent 111 as compared to the second projection 1211; along the first direction, a distance between an end of the second projection 1211 facing away from the explosion proof hole 111 and an end of the first projection 1311 facing away from the explosion proof hole 111 is L1, and a length of the first projection along the first direction is L2, wherein 1/6 is less than or equal to L1/L2 is less than or equal to 1/3.
It will be appreciated that the first surface 112 is disposed further from the first lower plastic member 130 than the second surface 113.
As can be appreciated, the explosion-proof valve 120 is welded to the top cover 110, the explosion-proof valve 120 includes a deformation portion 122 and a connection portion 121, and the connection portion 121 connects the deformation portion 122 and the inner wall 114; when the pressure applied to one side of the explosion-proof valve 120 reaches a preset value, the gas may be flushed out from the deformation portion 122, so that the deformation portion 122 is deformed and broken, and the gas is released to the other side of the explosion-proof valve 120, and the connection portion 121 is connected to the deformation portion 122 and the inner wall 114, respectively.
Optionally, the connecting portion 121 includes a welding portion 1221 and a reinforcing ring 1222, during the process of assembling the explosion-proof valve 120 to the top cover 110, the explosion-proof valve 120 is aligned with the explosion-proof hole 111, and the edge position of the explosion-proof valve 120 is compacted from the second surface 113 toward the first surface 112, so that the portion of the top cover 110 corresponding to the edge position of the explosion-proof valve 120 is recessed in the second surface 113 to form the reinforcing ring 1222; a recess is formed in the second surface 113 at a portion of the top cover 110 corresponding to the edge position of the explosion-proof valve 120, and the edge position of the explosion-proof valve 120 is disposed in the recess, so that the explosion-proof valve 120 is attached from the second surface 113 toward the first surface 112; further, the explosion-proof valve 120 and the top cover 110 are welded together by laser welding, and the welding portion 1221 is a portion where the explosion-proof valve 120 and the top cover 110 are welded. Opposite ends of the welding portion 1221 are respectively connected to the explosion-proof valve 120 and the top cover 110, and opposite ends of the reinforcement ring 1222 are respectively connected to the explosion-proof valve 120 and the top cover 110. At the connection portion 121, the top cover 110 provides a force parallel to the stacking direction of the top cover 110 and the first lower plastic member 130 for the explosion-proof valve 120, so that the connection portion 121 has a stronger impact strength.
It is understood that the end cap assembly 100 is assembled in the energy storage device 200, and the energy storage device 200 may be, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like.
It is understood that the extending direction of the top cover 110 refers to the length direction of the top cover 110.
It may be appreciated that the area surrounded by the orthographic projection of the vent 131 on the second surface 113 is the first projection 1311, and the shape of the first projection 1311 may be the shape of the vent 131.
It will be appreciated that, when the second projection 1211 is located within the range of the first projection 1311, the front projection of the connection portion 121 on the second surface 113 falls within the front projection range of the vent 131 on the second surface 113, in other words, the vent 131 is disposed opposite to the connection portion 121.
It will be appreciated that the first projection 1311 projects in a direction away from the explosion proof aperture 111 as compared to the second projection 1211, and that in the first direction, an end of the first projection 1311 that is away from the explosion proof aperture 111 may be disposed farther from the explosion proof aperture 111 than an end of the second projection 1211 that is away from the explosion proof aperture 111.
In the terms of this application, "at least one" means greater than or equal to one, and may be, but is not limited to, one, two, three, four, etc.
Specifically, the value of L1/L2 may be, but is not limited to, 1/6, 3/16, 1/5, 5/24, 11/48, 1/4, 13/48, 7/24, 5/16, and 1/3.
In this embodiment, the lower plastic component 170 and the explosion-proof valve 120 enclose a chamber 140, and the air hole 131 communicates the space on one side of the first lower plastic component 130 away from the top cover 110 with the chamber 140, when the end cover component 100 is assembled on the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, air can circulate from one side of the first lower plastic component 130 away from the top cover 110 to the chamber 140 through the air hole 131, so that the air can trigger the explosion-proof valve 120, and the extra air inside the energy storage device 200 is discharged to the outside of the energy storage device 200, which can prevent the pressure inside the energy storage device 200 from continuously increasing, thereby being beneficial to improving the safety performance of the energy storage device 200. In addition, the second projection 1211 is located within the range of the first projection 1311, so that the front projection of the vent hole 131 on the second surface 113 falls within the front projection range of the connecting portion 121 on the second surface 113, when the end cap assembly 100 is assembled on the energy storage device 200 and the energy storage device 200 is filled with electrolyte, the electrolyte impacts the connecting portion 121 toward the side close to the top cap 110 when the energy storage device 200 falls or vibrates, the electrolyte passes through the vent hole 131 to impact the connecting portion 121, and the connecting portion 121 has a strong impact strength, so that the explosion-proof valve 120 is prevented from being exploded due to direct impact of the electrolyte on the explosion-proof valve 120, false triggering of the explosion-proof valve 120 is avoided, and reliability of the explosion-proof valve 120 is improved. Moreover, along the first direction, a distance between an end of the second projection 1211 facing away from the explosion-proof hole 111 and an end of the first projection 1311 facing away from the explosion-proof hole 111 is L1, a length of the first projection 1311 along the first direction is L2, wherein 1/6 is less than or equal to L1/L2 is less than or equal to 1/3, and the second projection 1211 is closer to an end of the first projection 1311 facing away from the explosion-proof hole 111, so that when the energy storage device 200 falls or vibrates, an electrolyte impacts towards a side close to the top cover 110, the electrolyte impacts the connecting portion 121 through the air holes 131, and the connecting portion 121 has a strong impact strength, so that the electrolyte can be prevented from directly impacting the explosion-proof valve 120 to burst the explosion-proof valve 120, false triggering of the explosion-proof valve 120 can be avoided, and reliability of the explosion-proof valve 120 can be improved; in addition, when the end cover assembly 100 is assembled to the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, the air can circulate from the side of the first lower plastic member 130 away from the top cover 110 to the cavity 140 through the air hole 131, so that the air can trigger the explosion-proof valve 120, the extra air inside the energy storage device 200 is discharged to the outside of the energy storage device 200, the pressure inside the energy storage device 200 can be prevented from being continuously increased, and the safety performance of the energy storage device 200 is improved. When the value of L1/L2 is greater than 1/3, the distance between the end of the second projection 1211 facing away from the explosion-proof hole 111 and the end of the first projection 1311 facing away from the explosion-proof hole 111 is too large, or the length of the first projection 1311 along the first direction is too small, when the end cap assembly 100 is assembled in the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, the air flows from the side of the first lower plastic part 130 facing away from the top cap 110 to the cavity 140 through the air hole 131, most of the air directly impacts the surface of the connecting portion 121 and the top cap 110 facing the first lower plastic part 130, and a small part of the air directly impacts the explosion-proof valve 120, so that the explosion-proof valve 120 is difficult to be triggered, the excessive air inside the energy storage device 200 is difficult to be discharged to the outside of the energy storage device 200, and the pressure inside the energy storage device 200 continues to increase, thereby reducing the safety performance of the energy storage device 200. When the value of L1/L2 is smaller than 1/6, the distance between the end of the second projection 1211 facing away from the explosion-proof hole 111 and the end of the first projection 1311 facing away from the explosion-proof hole 111 is too small, or the length of the first projection 1311 along the first direction is too large, when the energy storage device 200 falls or vibrates, the electrolyte impacts towards the side close to the top cover 110, and the electrolyte directly impacts the connecting portion 121 and the explosion-proof valve 120 through the ventilation hole 131, so that the explosion-proof valve 120 is triggered by explosion, and reliability of the explosion-proof valve 120 is reduced.
Alternatively, the shape of the ventilation hole 131 may be, but not limited to, regular shapes such as square, rectangle, circle, ellipse, trapezoid, etc., and irregular shapes such as trilateral, quadrilateral, polygon, etc.
In some embodiments, the second projection 1211 is located within the first projection 1311, the area of the overlapping portion of the second projection 1211 and the first projection 1311 is S1, and the area of the first projection 1311 is S2, wherein 1/4+.s1/s2+.1/2. In other words, the area of the overlapping portion of the orthographic projection of the vent 131 on the second surface 113 and the orthographic projection of the connecting portion 121 on the second surface 113 is S1, and the cross-sectional area of the vent 131 is S2. Specifically, the value of S1/S2 may be, but is not limited to, 1/4, 13/48, 5/16, 1/3, 17/48, 3/8, 19/48, 5/12, 7/16, 11/24, 23/48, 1/2, etc.
It is understood that the area of the first projection 1311 is the cross-sectional area of the vent 131, and means the cross-sectional area of the vent 131 perpendicular to the direction of the air flow when the air flows from the space of the side of the first lower plastic member 130 facing away from the top cover 110 to the chamber 140 through the vent 131.
In this embodiment, when the second projection 1211 is located within the range of the first projection 1311 and S1, S2 satisfies 1/4+.s1/s2+.1/2, then the area S1 of the overlapping portion and the area S2 of the first projection 1311 are within a reasonable range, such that when the end cap assembly 100 is assembled to the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, gas can flow from the space on the side of the first lower plastic 130 facing away from the top cap 110 to the chamber 140 through the vent 131 to trigger the explosion-proof valve 120 and effect the evacuation of gas; in addition, the area of the overlapping portion is within a reasonable range such that when the end cap assembly 100 is applied to the energy storage device 200 and electrolyte is hit back, the electrolyte will impact the connection portion 121, preventing the electrolyte from bursting the explosion proof valve 120 to falsely trigger the explosion proof valve 120. When the value of S1/S2 is greater than 1/2, the area of the first projection 1311 is too small, so that the cross-sectional area of the air flow channel through the air hole 131 from the space on the side of the first lower plastic member 130 away from the top cover 110 to the chamber 140 is smaller, the efficiency of discharging the air into the chamber 140 through the air hole 131 is reduced, so that when the pressure inside the energy storage device 200 is greater than a certain value, the air is difficult to trigger the explosion-proof valve 120 in time and perform pressure relief, the risk that the pressure inside the energy storage device 200 continues to increase is increased, and the safety performance of the energy storage device 200 is reduced. When the value of S1/S2 is smaller than 1/4, the area of the first projection 1311 is too large, or the area of the overlapping portion is too small, so that when the energy storage device 200 falls or vibrates, the electrolyte impacts towards the side close to the top cover 110, the electrolyte impacts the connection portion 121 and the explosion-proof valve 120 through the air hole 131, the risk that the electrolyte directly impacts the explosion-proof valve 120 to burst the explosion-proof valve 120 is increased, the explosion-proof valve 120 is triggered by mistake, and the reliability of the explosion-proof valve 120 is reduced. In addition, if the area of the overlapping portion is too small, the area of the reinforcing ring 1222 or the welding part 1221 is too small during the assembly of the explosion-proof valve 120, so that the structural strength of the explosion-proof valve 120 is reduced, and the impact strength of the connection part 121 is reduced; furthermore, the difficulty of the explosion-proof valve 120 in the welding process is increased, which is not beneficial to the alignment of the explosion-proof valve 120 and the top cover 110, and thus the assembly accuracy of the explosion-proof valve 120 is reduced, and the assembly yield of the end cover assembly 100 is reduced.
In some embodiments, the second projection 1211 is located within the range of the first projection 1311, and the area S1 of the portion of the second projection 1211 overlapping the first projection 1311 satisfies the range: 8mm of 2 ≤S1≤28mm 2 In other words, the area S1 of the overlapping portion between the orthographic projection of the ventilation hole 131 on the second surface 113 and the orthographic projection of the connection portion 121 on the second surface 113 satisfies the range: 8mm of 2 ≤S1≤28mm 2 . Specifically, the value of the area S1 of the overlapping portion of the second projection 1211 and the first projection 1311 may be, but is not limited to, 8mm 2 、10mm 2 、12mm 2 、13mm 2 、15mm 2 、18mm 2 、19mm 2 、20mm 2 、21mm 2 、22mm 2 、23mm 2 、24mm 2 、25mm 2 、26mm 2 、27mm 2 28mm 2 Etc.
In the present embodiment, when the area S1 of the overlapping portion of the second projection 1211 and the first projection 1311 satisfies the range of 8mm 2 ≤S1≤28mm 2 The area of the overlap is within a reasonable range when the end cap assembly 100 is assembled to the energy storage device 200When the pressure inside the energy storage device 200 is greater than a certain value, the air can flow from the space on the side of the first lower plastic part 130 away from the top cover 110 to the chamber 140 through the air holes 131, so as to trigger the explosion-proof valve 120 and realize the discharge of the air; in addition, the area S1 of the overlapping portion is within a reasonable range, so that when the end cap assembly 100 is applied to the energy storage device 200 and the electrolyte is hit back, the electrolyte will impact the connection portion 121, thereby preventing the explosion-proof valve 120 from being exploded by the electrolyte to falsely trigger the explosion-proof valve 120, and improving the reliability of the explosion-proof valve 120. When the area S1 of the overlapping portion of the second projection 1211 and the first projection 1311 is greater than 28mm 2 When the area of the overlapping portion is too large, the orthographic projection of the air hole 131 on the second surface 113 is too small, so that the cross-sectional area of the air flow channel through which the air flows from the first lower plastic member 130 away from the top cover 110 to the chamber 140 is smaller through the air hole 131, the efficiency of discharging the air to the chamber 140 through the air hole 131 is reduced, and when the pressure inside the energy storage device 200 is greater than a certain value, the air is difficult to trigger the explosion-proof valve 120 in time and perform pressure relief, the risk that the pressure inside the energy storage device 200 is continuously increased is increased, and the safety performance of the energy storage device 200 is reduced. When the area S1 of the overlapping portion of the second projection 1211 and the first projection 1311 is less than 8mm 2 When the energy storage device 200 falls or vibrates, the area of the overlapping portion is too small, so that the electrolyte impacts towards the side close to the top cover 110, and the electrolyte impacts the connecting portion 121 and the explosion-proof valve 120 through the air holes 131, so that the risk that the electrolyte directly impacts the explosion-proof valve 120 to burst the explosion-proof valve 120 is increased, the explosion-proof valve 120 is triggered by mistake, and the reliability of the explosion-proof valve 120 is reduced. In addition, if the area of the overlapping portion is too small, the area of the reinforcing ring 1222 or the welding part 1221 is too small during the assembly of the explosion-proof valve 120, so that the structural strength of the explosion-proof valve 120 is reduced, and the impact strength of the connection part 121 is reduced; furthermore, the difficulty of the explosion-proof valve 120 in the welding process is increased, which is not beneficial to the alignment of the explosion-proof valve 120 and the top cover 110, and then the pressure drop is achieved The assembly accuracy of the explosion proof valve 120 is lowered, and the assembly yield of the end cap assembly 100 is lowered.
In some embodiments, the area S2 of the first projection 1311 satisfies the range: 48mm 2 ≤S2≤68mm 2 In other words, the cross-sectional area S2 of the ventilation hole 131 satisfies the range: 48mm 2 ≤S2≤68mm 2 . Specifically, the value of the area S2 of the first projection 1311 may be, but is not limited to, 48mm 2 、50mm 2 、52mm 2 、53mm 2 、55mm 2 、58mm 2 、59mm 2 、60mm 2 、61mm 2 、62mm 2 、63mm 2 、64mm 2 、65mm 2 、66mm 2 、67mm 2 68mm 2 Etc.
In the present embodiment, when the area S2 of the first projection 1311 satisfies the range 48mm 2 ≤S2≤68mm 2 When the cross-sectional area of the vent hole 131 is within a reasonable range, when the end cap assembly 100 is assembled to the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, gas can flow from the space of the side of the first lower plastic member 130 facing away from the top cap 110 to the chamber 140 through the vent hole 131, so as to trigger the explosion-proof valve 120 and realize the evacuation of the gas; in addition, the cross-sectional area of the vent 131 is within a reasonable range, so that when the end cap assembly 100 is applied to the energy storage device 200 and the electrolyte is hit back, the electrolyte will impact the connection portion 121, preventing the explosion-proof valve 120 from being exploded by the electrolyte to falsely trigger the explosion-proof valve 120. When the area S2 of the first projection 1311 is greater than 68mm 2 When the cross-sectional area of the vent hole 131 is too large, when the end cover assembly 100 is applied to the energy storage device 200 and the energy storage device 200 falls or vibrates, the electrolyte in the energy storage device 200 will pass through the vent hole 131 to impact towards the side close to the top cover 110, so that the risk that the electrolyte directly impacts the explosion-proof valve 120 to burst the explosion-proof valve 120 is increased, and the electrolyte will falsely trigger the explosion-proof valve 120, thereby reducing the reliability of the explosion-proof valve 120. When the area S2 of the first projection 1311 is less than 48mm 2 In this case, the cross-sectional area of the ventilation holes 131 is too smallThe cross-sectional area of the air flow channel through which the air flows from the space of the side of the first lower plastic member 130 away from the top cover 110 to the chamber 140 through the air holes 131 is smaller, so that the efficiency of discharging the air to the chamber 140 through the air holes 131 is reduced, when the pressure inside the energy storage device 200 is greater than a certain value, the air is difficult to trigger the explosion-proof valve 120 in time and perform pressure relief, the risk that the pressure inside the energy storage device 200 is continuously increased is increased, and the safety performance of the energy storage device 200 is reduced.
In some embodiments, the first projection 1311 and the second projection 1211 have an overlap region, the width of which along the first direction satisfies the range: 1 mm.ltoreq.H1.ltoreq.3.5 mm, in other words, the orthographic projection of the connecting portion 121 on the second surface 113 and the orthographic projection of the ventilation hole 131 on the second surface 113 have overlapping areas, and the width of the overlapping areas along the first direction satisfies the range: h1 is more than or equal to 1mm and less than or equal to 3.5mm. In particular, the width H1 of the overlap region may have a value of, but is not limited to, 1mm, 1.1mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, 2.8mm, 2.9mm, 3.0mm, 3.2mm, 3.4mm, 3.5mm, and the like.
In this embodiment, the first projection 1311 and the second projection 1211 have an overlapping area, and when the width range of the overlapping area satisfies 1 mm.ltoreq.h1.ltoreq.3.5 mm, the width of the overlapping area is within a reasonable range, so that when the end cap assembly 100 is assembled to the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, gas can flow from the space on the side of the first lower plastic member 130 facing away from the top cap 110 to the chamber 140 through the ventilation hole 131 to trigger the explosion-proof valve 120 and realize the evacuation of the gas; in addition, the width H1 of the overlapping region is within a reasonable range, so that when the end cap assembly 100 is applied to the energy storage device 200 and the electrolyte is hit back, the electrolyte will impact the connection portion 121, thereby preventing the explosion-proof valve 120 from being exploded by the electrolyte to falsely trigger the explosion-proof valve 120, and improving the reliability of the explosion-proof valve 120. When the width of the overlapping area is greater than 3.5mm, the width of the overlapping area is too large, so that when the end cover assembly 100 is applied to the energy storage device 200 and the pressure inside the energy storage device 200 is greater than a certain value, when the air flows from the space on one side of the first lower plastic member 130, which is away from the top cover 110, to the cavity 140 through the air holes 131, the air will impact the connection part 121, and it is difficult to trigger the explosion-proof valve 120 in time and release pressure, the risk that the pressure inside the energy storage device 200 continues to increase is increased, and the safety performance of the energy storage device 200 is reduced. When the width of the overlapping area is smaller than 1mm, the width of the overlapping area is too small, so that when the energy storage device 200 falls or vibrates, the electrolyte impacts towards the side close to the top cover 110, the electrolyte impacts the connecting portion 121 and the explosion-proof valve 120 through the air holes 131, the risk that the electrolyte directly impacts the explosion-proof valve 120 to cause the explosion-proof valve 120 to be exploded is increased, the explosion-proof valve 120 is triggered by mistake, and the reliability of the explosion-proof valve 120 is reduced. In addition, if the width of the overlapping region is too small, the area of the reinforcing ring 1222 or the welding part 1221 is too small during the assembly of the explosion-proof valve 120, so that the structural strength of the explosion-proof valve 120 is reduced, and the impact strength of the connection part 121 is reduced; furthermore, the difficulty of the explosion-proof valve 120 in the welding process is increased, which is not beneficial to the alignment of the explosion-proof valve 120 and the top cover 110, and thus the assembly accuracy of the explosion-proof valve 120 is reduced, and the assembly yield of the end cover assembly 100 is reduced.
Optionally, in some embodiments, the end cap assembly 100 further includes a protection sheet 180, the protection sheet 180 is disposed at a distance from the explosion-proof valve 120, the protection sheet 180 is disposed on the first surface 112 side of the top cap 110 and is connected to the top cap 110, and the protection sheet 180 is used to protect the explosion-proof valve 120.
In this embodiment, the end cap assembly 100 includes the protection sheet 180, the protection sheet 180 may be used to protect the explosion-proof valve 120, so as to prevent dust, electrolyte and other foreign matters from falling on the surface of the explosion-proof valve 120 facing away from the first lower plastic part 130, so that when the end cap assembly 100 is applied to the energy storage device 200 and the pressure inside the energy storage device 200 reaches a certain value, the gas may successfully burst the explosion-proof valve 120, thereby avoiding affecting the reliability of the explosion-proof valve 120 due to foreign matter accumulation, and improving the safety performance of the energy storage device 200.
Referring to fig. 3 to 14, in some embodiments, the top cover 110 extends along the first direction, the first lower plastic member 130 has two ventilation holes 131, the two ventilation holes 131 are disposed at intervals along a direction perpendicular to the first direction, the first lower plastic member 130 includes a first lower plastic body 132 and a first ventilation portion 133 that are connected, the first ventilation portion 133 has the ventilation holes 131, the first ventilation portion 133 includes a body portion 1331, a first protrusion 1332 and a second protrusion 1333, the first protrusion 1332 and the second protrusion 1333 are disposed at intervals on a surface of the body portion 1331 facing away from the top cover 110, the first protrusion 1332 is disposed around one of the two ventilation holes 131, the second protrusion 1333 is disposed around the other of the two ventilation holes 131, a gap 1334 is formed between the first protrusion 1332 and the second protrusion 1333, and the gap 1334 is communicated with the chamber 140.
As can be appreciated, the first protrusion 1332 is disposed around one vent 131, and the second protrusion 1333 is disposed around one vent 131.
Optionally, in some embodiments, the first and second protrusions 1332 and 1333 are the same structure. In other embodiments, the first and second protrusions 1332 and 1333 have different structures.
In this embodiment, two ventilation holes 131 are spaced apart along a direction perpendicular to the first direction, and the first protrusion 1332 is disposed around one of the two ventilation holes 131, and the second protrusion 1333 is disposed around the other of the two ventilation holes 131, so that a gap 1334 is formed between the first protrusion 1332 and the second protrusion 1333, the gap 1334 communicates with the chamber 140, and gas can enter the chamber 140 from the gap 1334. When the end cover assembly 100 is applied to the energy storage device 200, and the ventilation holes 131 are blocked, the gas is difficult to circulate from the space on the side of the first lower plastic member 130 away from the top cover 110 to the cavity 140 through the ventilation holes 131, so that the gas can enter the cavity 140 through the gap 1334 between the first protruding portion 1332 and the second protruding portion 1333, and then further trigger the explosion-proof valve 120, the first protruding portion 1332 and the second protruding portion 1333 provide an airflow channel for the end cover assembly 100, so that the gas is prevented from being unable to circulate to the cavity 140 due to the blocking of the ventilation holes 131, and the gas inside the energy storage device 200 can be timely discharged, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved. In addition, when the end cap assembly 100 is applied to the energy storage device 200, after the energy storage device 200 is used for a long time, the tab on the electrode assembly 210 may drop off, the first protrusion 1332 and the second protrusion 1333 may effectively block the broken tab from entering the cavity 140 through the air hole 131 and being in short-circuit connection with the top cap 110, and the first protrusion 1332 and the second protrusion 1333 improve the safety performance of the end cap assembly 100 applied to the energy storage device 200. Furthermore, a gap 1334 is formed on a side of the first protruding portion 1332 facing away from the second protruding portion 1333, a gap 1334 is also formed on a side of the second protruding portion 1333 facing away from the first protruding portion 1332, the gap 1334 is capable of allowing gas to pass through, and when gas is difficult to circulate to the chamber 140 from the space on the side of the first lower plastic member 130 facing away from the top cover 110 through the ventilation holes 131, the gas can also enter the chamber 140 through the gap 1334 on the side of the first protruding portion 1332 facing away from the second protruding portion 1333. The gap 1334 provides an air flow channel for the end cover assembly 100, so that air is prevented from flowing into the chamber 140 due to the shielding of the air holes 131, so that air in the energy storage device 200 can be timely discharged, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved.
In some embodiments, a distance H2 of the gap 1334 between the first and second protrusions 1332, 1333 in a direction perpendicular to the first direction satisfies the range: h2 is more than or equal to 0.6mm and less than or equal to 1.5mm. Specifically, the distance H2 of the gap 1334 between the first and second protrusions 1332 and 1333 may have a value of, but is not limited to, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.00mm, 1.05mm, 1.10mm, 1.15mm, 1.20mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, and the like.
In this embodiment, when the distance H2 between the gap 1334 between the first protruding portion 1332 and the second protruding portion 1333 satisfies the range 0.6mm < H2 < 1.5mm, the gap 1334 between the first protruding portion 1332 and the second protruding portion 1333 is within a reasonable range, so that when the ventilation holes 131 are blocked, the gas can smoothly circulate from the space on the side of the first lower plastic member 130 away from the top cover 110 to the chamber 140 through the gap 1334 between the first protruding portion 1332 and the second protruding portion 1333, so that the gas inside the energy storage device 200 can be timely discharged, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved. When the distance H2 between the gap 1334 between the first protrusion 1332 and the second protrusion 1333 is greater than 1.5mm, the gap 1334 between the first protrusion 1332 and the second protrusion 1333 is too large, so that the cross-sectional area of the air hole 131 is too small, and the cross-sectional area of the air flow channel through which the air flows from the space on the side of the first lower plastic part 130 facing away from the top cover 110 to the cavity 140 through the air hole 131 is smaller, the efficiency of the air discharged to the cavity 140 through the air hole 131 is reduced, so that when the pressure inside the energy storage device 200 is greater than a certain value, the air is difficult to trigger the explosion-proof valve 120 in time and release the pressure, the risk that the pressure inside the energy storage device 200 continues to increase is increased, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is reduced. When the distance H2 between the first protrusion 1332 and the second protrusion 1333 is smaller than 0.6mm, the gap 1334 between the first protrusion 1332 and the second protrusion 1333 is too small, so that when the ventilation hole 131 is blocked, gas is difficult to flow from the gap 1334 between the first protrusion 1332 and the second protrusion 1333 to the chamber 140, and when the pressure inside the energy storage device 200 is greater than a certain value, gas is difficult to flow from the space on the side of the first lower plastic member 130 away from the top cover 110 to the chamber 140, which increases the risk that the pressure inside the energy storage device 200 continues to increase, and reduces the safety performance of the end cover assembly 100 applied to the energy storage device 200.
In some embodiments, the height d1 of the first protrusion 1332 along the stacking direction of the first lower plastic member 130 and the top cover 110 satisfies the following range: d1 is more than or equal to 0.8mm and less than or equal to 1.4mm. Specifically, the height d1 of the first protrusion 1332 may have a value of, but is not limited to, 0.8mm, 0.84mm, 0.86mm, 0.9mm, 0.95mm, 1.00mm, 1.05mm, 1.10mm, 1.15mm, 1.20mm, 1.25mm, 1.30mm, 1.35mm, 1.4mm, and the like.
In this embodiment, when the height d1 of the first protruding portion 1332 is equal to or less than 0.8mm and equal to or less than 1.4mm in the stacking direction of the first lower plastic member 130 and the top cover 110, the height of the first protruding portion 1332 is within a reasonable range, so that the height of a gap 1334 formed by the first protruding portion 1332 and the second protruding portion 1333 in the stacking direction of the first lower plastic member 130 and the top cover 110 is also within a reasonable range, and gas can smoothly flow from the space on the side of the first lower plastic member 130 away from the top cover 110 to the chamber 140, so that the internal pressure of the energy storage device 200 is prevented from continuously increasing, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved; in addition, the first protrusion 1332 can effectively prevent the broken tab from entering the cavity 140 through the air hole 131, so as to avoid the short-circuit connection between the tab and the top cover 110. When the height d1 of the first protruding portion 1332 is greater than 1.4mm, the height of the first protruding portion 1332 is too large, so that the path of the space flowing from the side of the first lower plastic part 130 away from the top cover 110 to the chamber 140 is increased, the consumable of the first protruding portion 1332 is increased, and the thickness of the first protruding portion 1332 along the stacking direction of the first lower plastic part 130 and the top cover 110 is occupied, which is not beneficial to the light and thin design of the first lower plastic part 130. When the height d1 of the first protruding portion 1332 is smaller than 0.8mm, the height of the first protruding portion 1332 is too small, so that the height of the gap 1334 formed by the first protruding portion 1332 and the second protruding portion 1333 in the stacking direction of the first lower plastic member 130 and the top cover 110 is also small, the air flow cross-sectional area is small when the air flows through the gap 1334 between the first protruding portion 1332 and the second protruding portion 1333, and the air is difficult to flow from the space on the side, facing away from the top cover 110, of the first lower plastic member 130 to the cavity 140, the risk that the internal pressure of the energy storage device 200 is continuously increased is increased, and the safety performance of the application of the end cover assembly 100 to the energy storage device 200 is reduced. In addition, the first protrusion 1332 is difficult to block the broken tab from entering the cavity 140 through the ventilation hole 131, which increases the risk of the tab contacting the top cover 110 and short-circuiting connection, and reduces the safety performance of the end cover assembly 100 applied to the energy storage device 200.
In some embodiments, the height d2 of the second protrusion 1333 along the stacking direction of the first lower plastic member 130 and the top cover 110 satisfies the following range: d2 is more than or equal to 0.8mm and less than or equal to 1.4mm. Specifically, the height d2 of the second protrusion 1333 may have a value of, but is not limited to, 0.8mm, 0.84mm, 0.86mm, 0.9mm, 0.95mm, 1.00mm, 1.05mm, 1.10mm, 1.15mm, 1.20mm, 1.25mm, 1.30mm, 1.35mm, 1.4mm, and the like.
In this embodiment, when the height d1 of the second protrusion 1333 along the stacking direction of the first lower plastic member 130 and the top cover 110 satisfies the range of 0.8mm < d1 < 1.4mm, the height of the second protrusion 1333 is within a reasonable range, so that the height of the gap 1334 formed by the first protrusion 1332 and the second protrusion 1333 in the stacking direction of the first lower plastic member 130 and the top cover 110 is also within a reasonable range, and gas can smoothly flow from the space on the side of the first lower plastic member 130 facing away from the top cover 110 to the chamber 140, so as to avoid the internal pressure of the energy storage device 200 from continuously increasing, and improve the safety of the end cover assembly 100 applied to the energy storage device 200; in addition, the second protrusion 1333 can effectively prevent the broken tab from entering the cavity 140 through the air hole 131, so as to avoid the short-circuit connection between the tab and the top cover 110. When the height d1 of the second protruding portion 1333 is greater than 1.4mm, the height of the second protruding portion 1333 is too large, so that the path of the space flowing from the side of the first lower plastic part 130 away from the top cover 110 to the chamber 140 is increased, the consumable of the second protruding portion 1333 is increased, and the thickness of the second protruding portion 1333 along the stacking direction of the first lower plastic part 130 and the top cover 110 is occupied, which is not beneficial to the light and thin design of the first lower plastic part 130. When the height d1 of the second protruding portion 1333 is smaller than 0.8mm, the height of the second protruding portion 1333 is too small, so that the height of the gap 1334 formed by the first protruding portion 1332 and the second protruding portion 1333 in the stacking direction of the first lower plastic member 130 and the top cover 110 is also small, the air flow cross-sectional area is small when the air flows through the gap 1334 between the second protruding portion 1333 and the second protruding portion 1333, and the air is difficult to flow from the space on the side, facing away from the top cover 110, of the first lower plastic member 130 to the cavity 140, the risk that the internal pressure of the energy storage device 200 is continuously increased is increased, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is reduced. In addition, the second protrusion 1333 is difficult to block the broken tab from entering the cavity 140 through the ventilation hole 131, which increases the risk of the tab contacting the top cover 110 and short-circuiting connection, and reduces the safety performance of the end cover assembly 100 applied to the energy storage device 200.
Optionally, in some embodiments, the height of the first protrusion 1332 is equal to the height of the second protrusion 1333 along the stacking direction of the first lower plastic member 130 and the top cover 110.
It will be appreciated that the end face of the first projection 1332 facing away from the top cover 110 is flush with the end face of the second projection 1333 facing away from the top cover 110.
In this embodiment, the height of the first protruding portion 1332 is equal to the height of the second protruding portion 1333, so when the air holes 131 are blocked, air can uniformly circulate from the space on the side of the first lower plastic member 130 away from the top cover 110 to the cavity 140 through the gap 1334, the gap 1334 formed by the first protruding portion 1332 and the second protruding portion 1333 provides an air flow channel for the end cover assembly 100, so that air cannot circulate to the cavity 140 due to the blocking of the air holes 131, so that air inside the energy storage device 200 can be timely discharged, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved.
In some embodiments, the body portion 1331 protrudes from a surface of the first lower plastic body 132 facing away from the top cover 110, and the body portion 1331 has a plurality of first ventilation holes 134, and the plurality of first ventilation holes 134 communicate a space of a side of the first lower plastic member 130 facing away from the top cover 110 with the chamber 140.
In this embodiment, when the end cap assembly 100 is applied to the energy storage device 200, after the energy storage device 200 is used for a long time, the tab on the electrode assembly 210 may drop off, the body portion 1331 protrudes from the surface of the first lower plastic body 132 facing away from the top cap 110, the protruding portion may block the tab of the large sheet, so as to avoid the tab of the large sheet from blocking the body portion 1331, so that the gas may flow from the space on the side of the first lower plastic member 130 facing away from the top cap 110 to the chamber 140 through the first ventilation portion 133. The body portion 1331 has a plurality of first vent holes 134, the first vent holes 134 are used for communicating the space of the side of the first lower plastic part 130 away from the top cover 110 with the chamber 140, and the gas can flow from the space of the side of the first lower plastic part 130 away from the top cover 110 to the chamber 140 through the first vent holes 134, so as to drain the gas in the energy storage device 200 in time; in addition, the first vent 134 is beneficial to block broken tabs from entering the cavity 140 and shorting to the top cover 110, and the plurality of first vent 134 improves the safety of the end cap assembly 100 for use in the energy storage device 200.
In some embodiments, the first lower plastic member 130 further includes a rib portion 135, the rib portion 135 is disposed on a surface of the first lower plastic body 132 facing away from the top cover 110, and the rib portion 135 is connected to the body portion 1331, and the rib portion 135 extends along a second direction (as shown in Y in fig. 10), and the second direction intersects the first direction; the surface of the first lower plastic body 132 facing away from the rib portion 135 has a groove 136 corresponding to the position of the rib portion 135, and the groove 136 extends along the second direction.
In this embodiment, the rib portion 135 is disposed on the surface of the first lower plastic body 132 facing away from the top cover 110, and the rib portion 135 is beneficial to strengthening the structural strength of the surface of the first lower plastic body 132 facing away from the top cover 110 along the second direction, so that the first lower plastic body 132 can be prevented from bending and deforming along the second direction, and the first lower plastic member 130 can be better attached to the top cover 110. In addition, in the injection molding process of the first lower plastic part 130, the connection part between the rib part 135 and the surface of the first lower plastic body 132 facing away from the top cover 110 is a right-angle area, the plastic of the rib part 135 in the right-angle area is thicker, the contact area with the external air is smaller, and the cooling speed is slower; the plastic of the first lower plastic body 132 at the position facing away from the rib portion 135 corresponding to the rib portion 135 is thinner, and the contact area with the external air is larger, so that the cooling speed is faster. In the injection molding process, the slower cooling part of the right angle area contracts to the center, so that the surface of the first lower plastic body 132 deviates from the convex rib portion 135 and corresponds to the position of the convex rib portion 135, a groove is formed by pulling, one end of the first lower plastic body 132 deviating from the convex rib portion 135 is warped towards one end close to the explosion-proof valve 120, the first ventilation portion 133 is warped towards one end close to the explosion-proof valve 120, and then the first ventilation portion 133 is closer to the explosion-proof valve 120, so that the travel path of the gas, which is impacted by the first ventilation portion 133, of the explosion-proof valve 120 is shortened, the gas is prevented from flowing to other areas, and the reliability of the explosion-proof valve 120 is improved.
Optionally, in some embodiments, the second direction is perpendicular to the first direction.
Optionally, in some embodiments, the first lower plastic part 130 further includes a boss 137, where the boss 137 is disposed on a surface of the first lower plastic body 132 facing away from the top cover 110, and disposed on a side of the first lower plastic body 132 facing away from the rib 135, and a surface of the boss 137 facing away from the top cover 110 is a plane.
In this embodiment, the boss 137 is disposed on the surface of the first lower plastic body 132 facing away from the top cover 110, and is disposed on the side of the first lower plastic body 132 facing away from the bead portion 135, so that when the end cover assembly 100 is mounted on the energy storage device 200 and the energy storage device 200 is equipped with the electrode assembly 210, the surface of the boss 137 facing away from the top cover 110 is a plane, and then the surface of the boss 137 facing the electrode assembly 210 is a plane, so that the boss 137 can relatively flatly fit the end surface of the electrode assembly 210 facing the top cover 110, which is favorable for improving the stability of the assembly of the end cover assembly 100 on the energy storage device 200.
Referring to fig. 10 and 17, in some embodiments, along the stacking direction of the first lower plastic member 130 and the top cover 110, a height d3 from the rib portion 135 to the surface of the first lower plastic body 132 facing away from the top cover 110 satisfies a range: d3 is more than or equal to 0.2mm and less than or equal to 0.5mm. Specifically, the height d3 of the rib 135 to the surface of the first lower plastic body 132 facing away from the top cover 110 may have a value of, but is not limited to, 0.2mm, 0.22mm, 0.23mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.42mm, 0.44mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, etc.
In this embodiment, in the stacking direction of the first lower plastic part 130 and the top cover 110, when the height d3 from the rib portion 135 to the surface of the first lower plastic body 132 facing away from the top cover 110 satisfies the range of 0.2mm < d3 > < 0.5mm, the height of the rib portion 135 is within a reasonable range, so that the first lower plastic part 130 has better structural strength, and bending deformation of the first lower plastic body 132 along the second direction can be avoided, so that the first lower plastic part 130 can be better attached to the top cover 110; in addition, the height of the rib 135 is within a reasonable range, so that the surface of the rib 135 facing away from the top cover 110 is closer to the top cover 110 than the surface of the boss 137 facing away from the top cover 110, and the boss 137 can still relatively smoothly fit the end surface of the electrode assembly 210 facing the top cover 110, which is beneficial to improving the stability of the end cover assembly 100 assembled on the energy storage device 200. When the height d3 from the bead 135 to the surface of the first lower plastic body 132 facing away from the top cover 110 is greater than 0.5mm, the height of the bead 135 is too large, and the surface of the bead 135 facing away from the top cover 110 may be further away from the top cover 110 than the surface of the boss 137 facing away from the top cover 110, so that it is difficult for the boss 137 to fit smoothly to the end surface of the electrode assembly 210 facing the top cover 110, and the stability of the end cover assembly 100 assembled to the energy storage device 200 is reduced; in addition, the height of the rib 135 is too large, which increases the thickness of the first lower plastic member 130, thereby being disadvantageous in the miniaturization and lightweight design of the end cap assembly 100. When the height d3 from the rib portion 135 to the surface of the first lower plastic body 132 facing away from the top cover 110 is less than 0.2mm, the height of the rib portion 135 is too small, so that the structural strength of the first lower plastic member 130 is weak, the probability that the first lower plastic body 132 is bent and deformed along the second direction is increased, and the lamination effect of the first lower plastic member 130 and the top cover 110 is poor.
Referring to fig. 3 to 8, and fig. 18 to 20, in some embodiments, the lower plastic assembly 170 further includes a second lower plastic member 160, the second lower plastic member 160 and the first lower plastic member 130 are disposed at the same side of the top cover 110 at intervals, the second lower plastic member 160 includes a second lower plastic body 161 and a second ventilation portion 162 connected to each other, the second ventilation portion 162 is disposed at an end of the second lower plastic body 161 close to the first lower plastic member 130, and the second ventilation portion 162 communicates a space of a side of the second lower plastic member 160 facing away from the top cover 110 with the chamber 140; the second ventilation portion 162 has a plurality of second ventilation holes 163, and the second ventilation holes 163 communicate the space of the side of the second lower plastic part 160 facing away from the top cover 110 with the chamber 140.
It may be appreciated that the second lower plastic part 160 and the first lower plastic part 130 are disposed at a same side of the top cover 110 at intervals, and the first lower plastic part 130, the second lower plastic part 160 and the explosion-proof valve 120 enclose a chamber 140.
In this embodiment, the second lower plastic part 160 has the second ventilation portion 162, and the second ventilation portion 162 has a plurality of second ventilation holes 163, and the second ventilation holes 163 communicate the space of the side of the second lower plastic part 160 facing away from the top cover 110 with the chamber 140. When the end cover assembly 100 is applied to the energy storage device 200 and the pressure inside the energy storage device 200 reaches a certain value, the gas inside the energy storage device 200 may circulate from the space on the side of the second lower plastic part 160 facing away from the top cover 110 to the cavity 140 through the plurality of second ventilation holes 163, and then trigger the explosion-proof valve 120 to release the pressure, so as to avoid the pressure inside the energy storage device 200 from continuously increasing. The ventilation capability of the lower plastic component 170 is enhanced by the second ventilation portion 162 provided in the embodiment of the application, so that the energy storage device 200 can release pressure in time, and the safety performance of the energy storage device 200 is improved.
Optionally, in some embodiments, the first lower plastic part 130 and the second lower plastic part 160 are of a split structure. In this embodiment, the first lower plastic part 130 and the second lower plastic part 160 are of a split structure, which is beneficial to reducing the assembly difficulty of the first lower plastic part 130 and the second lower plastic part 160.
Optionally, in some embodiments, the second ventilation portion 162 has a third surface 164 facing the top cover 110, and the distance between the third surface 164 and the second surface 113 increases gradually from the second lower plastic 160 toward the first lower plastic 130, wherein an end of the third surface 164 near the first lower plastic 130 is farther from the top cover 110 than a surface of the first protrusion 1332 facing away from the top cover 110, and is farther from the top cover 110 than a surface of the second protrusion 1333 facing away from the top cover 110, such that a gap 1334 between the first protrusion 1332 and the second protrusion 1333 communicates with the chamber 140.
It can be appreciated that the direction from the second lower molding member to the first lower molding member is the extending direction of the top cover 110.
It will be appreciated that, from the second lower plastic part 160 to the first lower plastic part 130, the distance between the third surface 164 and the second surface 113 gradually increases, so that the third surface 164 is obliquely disposed with respect to the second surface 113, the extending surface of the third surface 164 intersects with the extending surface of the second surface 113, and the end portion of the third surface 164, which is close to the first lower plastic part 130, is further away from the second surface 113.
In this embodiment, the end of the third surface 164 near the first lower plastic part 130 is further away from the top cover 110 than the surface of the first protrusion 1332 facing away from the top cover 110, and further away from the top cover 110 than the surface of the second protrusion 1333 facing away from the top cover 110, so that a space formed by the end of the third surface 164 near the first lower plastic part 130 and the first lower plastic part 130 can be communicated with the gap 1334. When the ventilation holes 131 of the first lower plastic part 130 are blocked, the gas can enter the space formed by the end of the third surface 164, which is close to the first lower plastic part 130, and the first lower plastic part 130 through the gap 1334 between the first protruding part 1332 and the second protruding part 1333, i.e. enter the chamber 140, and then further trigger the explosion-proof valve 120. From the second lower plastic part 160 to the direction of the first lower plastic part 130, the distance between the third surface 164 and the second surface 113 gradually increases, which provides an air flow channel for the end cover assembly 100, so as to prevent air from being unable to circulate to the cavity 140 due to the shielding of the air holes 131, so that the air inside the energy storage device 200 can be timely discharged, and the safety performance of the end cover assembly 100 applied to the energy storage device 200 is improved. In addition, the third surface 164 is inclined with the second surface 113, which is favorable for providing a larger area gas flow channel for gas, and the gas can enter the chamber 140 through the space formed by the third surface 164 and the first lower plastic part 130 near one end of the first lower plastic part 130, which is favorable for improving the efficiency of the gas flowing from the space on the side of the second lower plastic part 160 away from the top cover 110 to the chamber 140, so that the gas can trigger the explosion-proof valve 120 to release pressure in time, and the reliability of the explosion-proof valve 120 is improved.
In some embodiments, the top cover 110 extends along a first direction, the second air permeable portion 162 includes a first air permeable sub-portion 1621, a second air permeable sub-portion 1622, and a third air permeable sub-portion 1623 connected to each other, the second air permeable sub-portion 1622 and the third air permeable sub-portion 1623 are disposed at intervals, a portion of the first air permeable sub-portion 1621 is disposed through the second air permeable sub-portion 1622 and the third air permeable sub-portion 1623 and connects the second air permeable sub-portion 1622 and the third air permeable sub-portion 1623, respectively, and the first air permeable sub-portion 1621, the second air permeable sub-portion 1622, and the third air permeable sub-portion 1623 are each provided with the second air permeable hole 163; the surface of the first air permeable sub-part 1621 facing away from the top cover 110 is further away from the top cover 110 than the surface of the second air permeable sub-part 1622 facing away from the top cover 110, and the surface of the first air permeable sub-part 1621 facing away from the top cover 110 is further away from the top cover 110 than the surface of the third air permeable sub-part 1623 facing away from the top cover 110, such that a gap 1334 between the first protrusion 1332 and the second protrusion 1333 communicates with the chamber 140.
In this embodiment, the first ventilation sub-portion 1621, the second ventilation sub-portion 1622, and the third ventilation sub-portion 1623 are respectively provided with the second ventilation holes 163, and the second ventilation holes 163 are communicated with the space of the side of the second lower plastic part 160 facing away from the top cover 110 and the chamber 140. When the end cover assembly 100 is applied to the energy storage device 200 and the pressure inside the energy storage device 200 reaches a certain value, the gas inside the energy storage device 200 may circulate from the space on the side of the second lower plastic part 160 facing away from the top cover 110 to the cavity 140 through the plurality of second ventilation holes 163, and then trigger the explosion-proof valve 120 to release the pressure, so as to avoid the pressure inside the energy storage device 200 from continuously increasing. In addition, the surface of the first air permeable sub-portion 1621 facing away from the top cover 110 is further away from the top cover 110 than the surface of the second air permeable sub-portion 1622 facing away from the top cover 110, and the surface of the second air permeable sub-portion 1622 facing away from the top cover 110 is recessed between the surface of the first air permeable sub-portion 1621 facing away from the top cover 110, such that when the surface of the first air permeable sub-portion 1621 facing away from the top cover 110 is pressed and shielded, the surface of the second air permeable sub-portion 1622 facing away from the top cover 110 is not shielded; the surface of the first air permeable sub-portion 1621 facing away from the top cover 110 is further away from the top cover 110 than the surface of the third air permeable sub-portion 1623 facing away from the top cover 110, and then the surface of the third air permeable sub-portion 1623 facing away from the top cover 110 is recessed between the surface of the first air permeable sub-portion 1621 facing away from the top cover 110, such that when the surface of the first air permeable sub-portion 1621 facing away from the top cover 110 is blocked by extrusion, the surface of the third air permeable sub-portion 1623 facing away from the top cover 110 is not blocked. When the surface of the first ventilation sub-portion 1621 facing away from the top cover 110 is blocked by extrusion, the gas is difficult to circulate from the space on the side of the second lower plastic part 160 facing away from the top cover 110 to the chamber 140 through the second ventilation hole 163 of the first ventilation sub-portion 1621, and the gas can smoothly circulate from the space on the side of the second lower plastic part 160 facing away from the top cover 110 to the chamber 140 through the second ventilation hole 163 of the second ventilation sub-portion 1622 and the second ventilation hole 163 of the third ventilation sub-portion 1623, so as to trigger the explosion-proof valve 120 to release pressure, thereby avoiding the pressure inside the energy storage device 200 from continuously increasing. The surface of the second ventilation sub-portion 1622 facing away from the top cover 110 and the surface of the third ventilation sub-portion 1623 facing away from the top cover 110 are both closer to the top cover 110, so that an airflow channel is provided for the second lower plastic part 160, and smooth air circulation from the space on one side of the second lower plastic part 160 facing away from the top cover 110 to the chamber 140 is facilitated, so that the air timely triggers the explosion-proof valve 120 to release pressure, and the reliability of the explosion-proof valve 120 is improved.
In some embodiments, the first air permeable sub-portion 1621 includes a first portion 1621a and a second portion 1621b connected to each other, and the second air permeable sub-portion 1622, the second portion 1621b, and the third air permeable sub-portion 1623 are sequentially arranged and sequentially connected, and are all located at a side of the first portion 1621a facing away from the first lower plastic component 130, and one end of the second portion 1621b facing away from the first portion 1621a is connected to the second lower plastic body 161; opposite ends of the first portion 1621a are respectively connected to the second lower plastic body 161 along a direction perpendicular to the extending direction of the top cover 110.
In this embodiment, along the direction perpendicular to the extending direction of the top cover 110, the second air permeable sub-portion 1622, the second portion 1621b, and the third air permeable sub-portion 1623 are sequentially arranged and sequentially connected, and are both located at one side of the first portion 1621a away from the first lower plastic component 130, so that the first portion 1621a and the second portion 1621b are connected to form a structure similar to a "T", the "T" structure formed by connecting the first portion 1621a and the second portion 1621b is beneficial to providing a larger area air flow channel for the air, to improve the efficiency of the air flowing from the space on one side of the second lower plastic component 160 away from the top cover 110 to the chamber 140, so that the air triggers the explosion-proof valve 120 to release pressure in time, and improve the reliability of the explosion-proof valve 120.
Referring to fig. 21 and 22, the embodiment of the present application further provides an energy storage device 200, where the energy storage device 200 includes an electrode assembly 210, a switching assembly 220, and the end cap assembly 100 provided in the embodiment of the present application, and the switching assembly 220 is located at one side of the electrode assembly 210 and is electrically connected to the electrode assembly 210; the end cap assembly 100 is disposed on a side of the adapter assembly 220 facing away from the electrode assembly 210, and is electrically connected to the adapter assembly 220.
Alternatively, the energy storage device 200 may be, but is not limited to being, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like.
In the embodiment of the present application, the energy storage device 200 includes the end cover assembly 100 provided in the embodiment of the present application, when the pressure inside the energy storage device 200 is greater than a certain value, the air inside the energy storage device 200 may flow from the side of the first lower plastic part 130, which is away from the top cover 110, to the cavity 140 through the air hole 131 of the first lower plastic part 130, so that the air may trigger the explosion-proof valve 120, to drain the redundant air inside the energy storage device 200 to the outside of the energy storage device 200, which may prevent the pressure inside the energy storage device 200 from continuously increasing, and is beneficial to improving the safety performance of the energy storage device 200. The opposite ends of the switching assembly 220 are electrically connected to the electrode assembly 210 and the end cap assembly 100, respectively, so as to implement the charging and discharging process of the energy storage device 200. The energy storage device 200 has high safety performance.
Optionally, the energy storage device 200 further includes a housing 230, and the housing 230 encloses a housing cavity 231, and the housing cavity 231 is used for housing the electrode assembly 210.
Optionally, the first lower plastic member 130 and the second lower plastic member 160 are made of plastic, and the first lower plastic member 130 and the second lower plastic member 160 are used for insulating the top cover 110 from the electrode assembly 210 in the energy storage device 200.
Optionally, the end cap assembly 100 further includes a pole 150 and a metal pressing block 151, the metal pressing block 151 is disposed on the first surface 112 side of the top cover 110, the pole 150 is disposed through the top cover 110 and the metal pressing block 151, and the pole 150 is disposed in an insulating manner with the top cover 110 and electrically connected with the metal pressing block 151. In this embodiment, the pole 150 is disposed in an insulating manner with the top cover 110, so as to avoid the pole 150 from being connected with the top cover 110 in a short circuit, which is beneficial to improving the safety performance of the energy storage device 200. The pole 150 is electrically connected with the metal pressing block 151, and the pole 150 can be electrically connected with external power supply equipment, so that charging and discharging of the energy storage device 200 are realized. The side of the adapter assembly 220 facing away from the electrode assembly 210 is electrically connected to the end cap assembly 100, and the side of the adapter assembly 220 facing away from the electrode assembly 210 is electrically connected to the metal pressing block 151.
Optionally, the electrode assembly 210 includes a positive electrode plate (not shown), a separator (not shown), and a negative electrode plate (not shown) sequentially arranged, and the positive electrode plate and the negative electrode plate are electrically connected to the end cap assembly 100 through the switching assembly 220.
It may be appreciated that the electrode post 150 includes an anode electrode post 150 and a cathode electrode post 150, the metal pressing block 151 includes an anode metal pressing block 151 and a cathode metal pressing block 151, the switching component 220 includes an anode switching component 220 and a cathode switching component 220, then the cathode electrode plate is sequentially electrically connected with the cathode switching component 220, the cathode metal pressing block 151 and the cathode electrode post 150, and the anode electrode plate is sequentially electrically connected with the anode switching component 220, the anode metal pressing block 151 and the anode electrode post 150, so as to realize that electric energy of the electrode component 210 is transmitted to the outside or an external power supply is stored in the electrode component 210, thereby realizing a charging and discharging process of the energy storage device 200.
Optionally, in some embodiments, the energy storage device 200 further includes an insulating film (not shown), and the insulating film is attached to a surface of the electrode assembly 210 facing the top cover 110. In this embodiment, when the electrode assembly 210 and the adapter assembly 220 are welded, welding slag will be generated, and the insulating film can prevent the welding slag from directly falling on the electrode assembly 210, so that the electrode assembly 210 is shorted, and the safety performance of the energy storage device 200 is improved.
Referring to fig. 23 and 24, an embodiment of the present application further provides an electrical system 300, where the electrical system 300 includes an electrical device 310 and the energy storage device 200 provided in the present application, and the energy storage device 200 supplies power to the electrical device 310.
In this embodiment, the explosion-proof valve 120 of the energy storage device 200 has high reliability, and the energy storage device 200 has high safety performance, so that when the energy storage device 200 is applied to the power utilization system 300, a stable power supply can be provided for the power utilization device 310, so that the power utilization system 300 can stably operate.
The power consumption system 300 of the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart bracelet, a smart watch, an electronic reader, a game console, and the like. And can also be vehicles such as automobiles, trucks, sedans, trucks, vans, motor cars, high-speed rails, electric automobiles and the like. In addition, various home appliances and the like are also possible.
It should be understood that the electrical system 300 described in this embodiment is only one form of the electrical system 300 to which the energy storage device 200 is applied, and should not be construed as a limitation of the electrical system 300 provided in the present application, or as a limitation of the electrical system 300 provided in the various embodiments of the present application.
Reference in the present application to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other to form yet another embodiment without departing from the spirit and scope of the present application.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or equivalent replaced without departing from the spirit and scope of the technical solution of the present application.
Claims (11)
1. An end cap assembly, said end cap assembly comprising:
The top cover is provided with explosion-proof holes, the top cover is provided with a first surface and a second surface which are arranged in a back-to-back mode, the explosion-proof holes penetrate through the first surface and the second surface respectively, the top cover is provided with an inner wall which surrounds the explosion-proof holes, and the top cover extends along a first direction;
the explosion-proof valve seals the explosion-proof hole and is welded to the top cover, and comprises a deformation part and a connecting part, wherein the connecting part is connected with the deformation part and the inner wall; and
the lower plastic component is arranged on the second surface side of the top cover in a stacked mode; the lower plastic component and the explosion-proof valve enclose a cavity, the lower plastic component comprises a first lower plastic part, the first lower plastic part is provided with at least one ventilation hole, at least one ventilation hole is used for communicating the space of one side of the first lower plastic part, which is far away from the top cover, with the cavity, the first lower plastic part is provided with two ventilation holes, the two ventilation holes are arranged at intervals along the direction perpendicular to the first direction, the first lower plastic part comprises a first lower plastic body and a first ventilation part which are connected, the first ventilation part is provided with the ventilation holes, the first ventilation part comprises a body part, a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged on the surface of the body part, which is far away from the top cover, the first protruding part is arranged around one of the two ventilation holes, the second protruding part is arranged around the other of the two ventilation holes, a gap is arranged between the first protruding part and the second protruding part, and the gap is communicated with the cavity;
The extending direction of the top cover is a first direction, a region surrounded by orthographic projections of the vent holes on the second surface is a first projection, orthographic projections of the connecting parts on the second surface are second projections, the second projections are located in the range of the first projections, and compared with the second projections, the first projections are protruded towards a direction deviating from the explosion-proof hole; along the first direction, the distance between one end of the second projection, which is away from the explosion-proof hole, and one end of the first projection, which is away from the explosion-proof hole, is L1, and the length of the first projection along the first direction is L2, wherein L1/L2 is more than or equal to 1/6 and less than or equal to 1/3; the second projection is positioned in the range of the first projection, the area of the overlapping part of the second projection and the first projection is S1, and the area of the first projection is S2, wherein S1/S2 is more than or equal to 1/4 and less than or equal to 1/2; the area S1 of the overlapping portion of the second projection and the first projection satisfies the range: 8mm of 2 ≤S1≤28mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The area S2 of the first projection satisfies the range: 48mm 2 ≤S2≤68mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first projection and the second projection have an overlap region, and a width of the overlap region along the first direction satisfies a range: h1 is more than or equal to 1mm and less than or equal to 3.5mm; in a direction perpendicular to the first direction, a distance H2 of a gap between the first protruding portion and the second protruding portion satisfies a range: h2 is more than or equal to 0.6mm and less than or equal to 1.5mm; along the lamination direction of the first lower plastic part and the top cover, the height d1 of the first protruding part meets the following range: d1 is more than or equal to 0.8mm and less than or equal to 1.4mm, and the height d2 of the second protruding part meets the range: d2 is more than or equal to 0.8mm and less than or equal to 1.4mm 。
2. The end cap assembly of claim 1, wherein the body portion protrudes from a surface of the first lower plastic body facing away from the top cap, the body portion having a plurality of first vent holes that communicate a space of a side of the first lower plastic facing away from the top cap with the chamber.
3. The end cap assembly of claim 1, wherein the first lower plastic piece further comprises a bead portion disposed on a surface of the first lower plastic body facing away from the top cap, the bead portion connecting the body portion, the bead portion extending in a second direction, the second direction intersecting the first direction; the surface of the first lower plastic body, which is away from the convex rib part, is provided with a groove corresponding to the convex rib part, and the groove extends along the second direction.
4. The end cap assembly of claim 3, wherein a height d3 of the bead to a surface of the first lower plastic body facing away from the top cap along a thickness direction of the first lower plastic member satisfies a range: d3 is more than or equal to 0.2mm and less than or equal to 0.5mm.
5. The end cap assembly of claim 1, wherein the lower plastic assembly further comprises a second lower plastic part, the second lower plastic part and the first lower plastic part are arranged on the same side of the top cap at intervals, the second lower plastic part comprises a second lower plastic body and a second ventilation part which are connected, the second ventilation part is arranged at one end, close to the first lower plastic part, of the second lower plastic body, and the second ventilation part communicates a space of one side, away from the top cap, of the second lower plastic part with the cavity; the second ventilation part is provided with a plurality of second ventilation holes, and the second ventilation holes are used for communicating the space of one side, deviating from the top cover, of the second lower plastic part with the cavity.
6. The end cap assembly of claim 5, wherein the first lower plastic part comprises a first lower plastic body and a first ventilation part connected, the first ventilation part comprises a body part, a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged on the surface of the body part, which is away from the top cap, at intervals, the first protruding part and the second protruding part are all arranged around the ventilation holes, the second ventilation part is provided with a third surface facing the top cap, the distance between the third surface and the second surface gradually increases from the second lower plastic part to the direction of the first lower plastic part, one end of the third surface, which is close to the first lower plastic part, is farther from the top cap than the surface, which is away from the top cap, so that the gap between the first protruding part and the second protruding part is communicated with the cavity.
7. The end cap assembly of claim 6, wherein the top cap extends along a first direction, the second air permeable portion includes a first air permeable sub-portion, a second air permeable sub-portion, and a third air permeable sub-portion that are connected, the second air permeable sub-portion and the third air permeable sub-portion being disposed at intervals, a portion of the first air permeable sub-portion passing through the second air permeable sub-portion and the third air permeable sub-portion and respectively connecting the second air permeable sub-portion and the third air permeable sub-portion, the first air permeable sub-portion, the second air permeable sub-portion, and the third air permeable sub-portion each having the second air vent; the surface of the first air permeable sub-portion facing away from the top cover is farther from the top cover than the surface of the second air permeable sub-portion facing away from the top cover, and the surface of the first air permeable sub-portion facing away from the top cover is farther from the top cover than the surface of the third air permeable sub-portion facing away from the top cover, so that a gap between the first protruding portion and the second protruding portion is communicated with the cavity.
8. The end cap assembly of claim 7, wherein the first air permeable sub-portion comprises a first portion and a second portion connected, the second air permeable sub-portion, the second portion and the third air permeable sub-portion are sequentially arranged and sequentially connected and are all located at one side of the first portion facing away from the first lower plastic part, and one end of the second portion facing away from the first portion is connected with the second lower plastic body; and the two opposite ends of the first part are respectively connected with the second lower plastic body along the extending direction vertical to the top cover.
9. An energy storage device, the energy storage device comprising:
an electrode assembly; and
the switching component is positioned on one side of the electrode component and is electrically connected with the electrode component;
the end cap assembly of any one of claims 1 to 8, disposed on a side of the adapter assembly facing away from the electrode assembly, and electrically connected to the adapter assembly.
10. An electrical power consumption system, comprising:
an electric device; and
the energy storage device of claim 9, the energy storage device to power the powered device.
11. An energy storage system, comprising
User load;
the electric energy conversion device is used for converting other forms of energy into electric energy, the electric energy conversion device is electrically connected with the user load, and the electric energy converted by the electric energy conversion device is used for supplying power for the user load; and
the energy storage device of claim 9, wherein the energy storage device is electrically connected to the consumer load and the power conversion device, respectively, the energy storage device stores the power converted by the power conversion device, and the energy storage device supplies power to the consumer load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310635209.4A CN116404322B (en) | 2023-05-31 | 2023-05-31 | End cover assembly, energy storage device, power utilization system and energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310635209.4A CN116404322B (en) | 2023-05-31 | 2023-05-31 | End cover assembly, energy storage device, power utilization system and energy storage system |
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| CN116404322A CN116404322A (en) | 2023-07-07 |
| CN116404322B true CN116404322B (en) | 2023-08-08 |
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| CN208489243U (en) * | 2018-07-27 | 2019-02-12 | 宁德时代新能源科技股份有限公司 | Secondary cell cap assembly and secondary cell |
| CN211017216U (en) * | 2019-12-26 | 2020-07-14 | 宁德时代新能源科技股份有限公司 | Cover plate assembly, single battery, battery module, battery pack and device |
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| CN116404322A (en) | 2023-07-07 |
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Address after: Room 501, R&D Building, No. 2 Sany Yundu, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Patentee after: Shenzhen Haichen Energy Storage Technology Co.,Ltd. Country or region after: China Patentee after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: Room 501, R&D Building, No. 2 Sany Yundu, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Patentee before: Shenzhen Haichen Energy Storage Control Technology Co.,Ltd. Country or region before: China Patentee before: Xiamen Haichen Energy Storage Technology Co.,Ltd. |
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