CN116231179A - End cap assembly, battery and energy storage device - Google Patents
End cap assembly, battery and energy storage device Download PDFInfo
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- CN116231179A CN116231179A CN202310389233.4A CN202310389233A CN116231179A CN 116231179 A CN116231179 A CN 116231179A CN 202310389233 A CN202310389233 A CN 202310389233A CN 116231179 A CN116231179 A CN 116231179A
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- protrusion
- current collector
- battery
- bulge
- end cap
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Images
Classifications
-
- 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
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides an end cap assembly, a battery and an energy storage device. The end cap assembly includes: the insulator comprises a first body and a first bulge, the first bulge is arranged on the first body in a protruding mode, the insulator is provided with a containing groove, the current collector is partially embedded in the containing groove and is in contact with the first bulge or in clearance fit, the current collector comprises a first connecting portion, the first connecting portion and the first bulge are matched to be used for being abutted to the lug group, the outer periphery of the first connecting portion comprises a first arc section and a connecting section, the connecting section is connected with two ends of the first arc section, and the radian alpha of the first arc section is 270 degrees less than or equal to alpha <360 degrees. The application provides an end cover assembly structure to solve the utmost point ear of multipolar ear electric core among the prior art and turn up easily, lead to appearing electric core utmost point ear and collector poor contact or turn over the fracture and puncture the phenomenon of diaphragm even easily, influence the security performance and the technical problem of reliability in use of battery.
Description
Technical Field
The application relates to the field of battery technology, and in particular relates to an end cover assembly, a battery and an energy storage device.
Background
The chargeable and dischargeable battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and has wide application in the fields of electric automobiles, mobile equipment and the like.
The current collector is used as a key part for battery assembly, and the main function of the current collector is to realize connection between the battery cell tab and the pole. However, during the assembly process of the battery or after electrolyte is injected, the tab of the existing multi-tab battery cell is easy to turn outwards, so that the phenomenon that the contact between the battery tab and the current collector is poor or the tab is folded and broken or even the diaphragm is punctured easily occurs, and the safety performance and the use reliability of the battery are greatly affected.
Disclosure of Invention
The application provides an end cover assembly, battery and energy storage device to solve the utmost point ear of multipolar ear electric core among the prior art and turn up easily, lead to appearing electric core utmost point ear and collector poor contact or turn over the phenomenon that the fracture was pricked the diaphragm even, influence the security performance and the technical problem of reliability in use of battery easily.
To solve the above problems, in a first aspect, the present application provides an end cap assembly, comprising: the insulator comprises a first body and a first bulge, the first bulge is arranged on the first body in a protruding mode, the insulator is provided with a containing groove, the current collector is partially embedded in the containing groove and is in contact with the first bulge or in clearance fit, the current collector comprises a first connecting portion, the first connecting portion and the first bulge are matched to be used for being abutted to the lug group, the outer periphery of the first connecting portion comprises a first arc section and a connecting section, the connecting section is connected with two ends of the first arc section, and the radian alpha of the first arc section is 270 degrees less than or equal to alpha <360 degrees.
It can be understood that the range of the radian alpha of the first circular arc section is 270 degrees less than or equal to alpha <360 degrees, so that the first connecting part of the current collector is approximately of a circular structure, the cross section area of the current collector along the radial direction of the first body and the structural strength of the current collector are increased, the coverage area and the abutting capacity of the current collector on the battery core lug are further improved, the phenomenon of outward turning of the lug is reduced, and the safety performance and the use reliability of the battery are ensured. Through setting up the joint that first arch and first connecting portion cooperate and be used for with the utmost point ear group jointly, after end cover assembly and electric core assembly for the utmost point ear group part that first connecting portion did not cover is by first protruding butt, thereby further guarantee the end cover assembly to the butt area of electric core utmost point ear group, further reduce the probability that the utmost point ear turned up, thereby guarantee the security performance and the reliability of use of battery better. In addition, the lateral surface of the first bending part of the current collector contacts with the inner lateral surface of the first bulge or is in clearance fit, and through the arrangement of the first bulge, limiting and supporting force can be provided for the weaker first bending part of the current collector, so that on one hand, the first bending part can be prevented from being bent and extruded in a transitional way, and on the other hand, the abutting effect of the first current collector and the lug can be enhanced, and therefore the structural strength and the use reliability of the end cover assembly are guaranteed.
In one possible embodiment, the arc α of the first arc segment ranges from 270 to 290.
It can be understood that the range of the radian alpha of the first arc section is 270 degrees or more and less than or equal to 290 degrees, after the end cover assembly and the battery cell are assembled, the first connecting part is ensured to have a larger coverage area to the tab group, and meanwhile, the first connecting part and the transition part are ensured to have a larger connection area, so that the overcurrent capacity and the connection strength between the first connecting part and the transition part are ensured, and the integral structural strength and the use reliability of the current collector are improved.
In a possible implementation manner, the insulating piece further comprises a second protrusion extending along the periphery of the first body, the inner side face of the second protrusion and the first body form a containing groove, the first protrusion is located in the containing groove, two ends of the second protrusion are matched with the first body to form a notch, the notch is arranged opposite to the first protrusion along the radial direction of the first body, the outer periphery of the second protrusion comprises a second arc section, and the radian beta of the second arc section is smaller than or equal to the radian alpha of the first arc section.
As can be appreciated, by setting the radian β of the second arc section to be smaller than or equal to the radian α of the first arc section, the size of the notch formed by the second protrusion and the first body in cooperation is moderate, on one hand, the second protrusion can be ensured to have better structural strength and supporting capability, and the structural strength and the use reliability of the insulating member are ensured; on the other hand, when the current collector is unfolded, the transition part of the current collector can be positioned in a notch formed by the cooperation of the second bulge and the first body, that is, when the current collector is unfolded, the first connecting part, the transition part and the second connecting part can be positioned on the same plane, so that the fixation of a welding tool is facilitated when the end cover assembly is assembled or the current collector is assembled with the battery cell, the stress deformation of the first bending part or the second bending part is reduced, the structural strength of the current collector is ensured, and the assembly efficiency and the use reliability of the end cover assembly are improved.
In a possible implementation manner, the first protrusion is provided with a first limiting surface parallel to the axis of the first body, the current collector is in clearance fit with the first limiting surface, the second protrusion is cut by the first limiting surface, a part opposite to the first protrusion and a part of the first protrusion where the first limiting surface is located form a surrounding part, the first protrusion at least partially fills the surrounding part, the outer periphery of the part, which is cut by the first limiting surface and opposite to the first protrusion, of the second protrusion is a second arc subsection, and radian gamma of the second arc subsection meets the relation: γ=360° - α.
It can be understood that, through setting up the radian alpha of first circular arc section and the radian gamma of second circular arc sub-section to 360, after the end cover subassembly is assembled with the electric core, not only can make the part of the tab group that first connecting portion was uncovered by first arch butt, the first connecting portion and the enclosing portion of mass flow piece approximately constitute whole circular moreover, can make the tab group of electric core terminal surface basically be covered by mass flow piece or insulating part, and then guarantee the cover butt area of end cover subassembly to tab group, reduce the probability that the tab turns up better, guarantee the security performance and the reliability of use of battery better. By arranging the current collector in clearance fit with the first limiting surface, folding errors can be reserved for the current collector, the current collector can be folded smoothly, and the transition part of the current collector is positioned at one side of the first bulge, which is close to the axis of the insulating part; when the current collector is acted by external force, the gap can also provide a certain displacement space for the current collector, so that the current collector is prevented from being excessively extruded, and the assembly efficiency and the use reliability of the end cover assembly are improved.
In one possible embodiment, the first protrusion includes a first portion and a second portion, the second portion connects the first portion and the second protrusion, the first limiting surface is an outer side surface of the first portion near the current collector, the second portion is located in the enclosing portion, and a portion of the enclosing portion is filled with the second portion.
It can be understood that the second part is filled by the second part through the part provided with the enclosing part, so that the abutting effect of the second part on the tab group can be ensured, the probability of outward turning of the tabs is reduced, the material use of the second part can be reduced, the weight of the insulating part is reduced, and further the energy density of the battery is improved.
In one possible embodiment, the current collector further comprises a transition part and a second connection part, wherein the transition part is connected between the first connection part and the second connection part in a bending way; the insulating part further comprises a third bulge and a fourth bulge, the third bulge and the fourth bulge are oppositely arranged and are located in the accommodating groove, the third bulge and the fourth bulge are located between the gap and the first bulge along the direction of the gap towards the first bulge, the third bulge is provided with a second limiting surface parallel to the axis of the first body, the fourth bulge is provided with a third limiting surface parallel to the axis of the first body, the first connecting part is in contact with the third bulge and the fourth bulge, and the transition part and the second connecting part are located in the area surrounded by the first limiting surface, the second limiting surface and the third limiting surface.
It can be understood that through setting up transition portion and second connecting portion and being located first spacing face, the spacing face of second and the regional that the spacing face of third encloses, can carry out spacingly to transition portion and second connecting portion, avoid the mass flow piece to take place the displacement, and then improve end cover assembly's joint strength and reliability in use.
In a possible embodiment, the third and fourth protrusions have the same height, the height H of the third protrusion, in the axial direction of the insulating member 3 The relation is satisfied: h 3 ＝H 1 D, wherein H 1 The height of the first protrusion in the axial direction of the insulator is D, which is the thickness of the current collector.
It will be appreciated that by providing the third and fourth protrusions to be the same height, when the end cap assembly is assembled with the cell, or when the cell is exposed to the outside worldWhen the acting force or the gas generated by the battery enables the internal pressure of the battery to be larger, the third bulge and the fourth bulge can jointly bear the first connecting part of the current collector, so that the first connecting part is ensured to be uniformly stressed, the first bending part and the second bending part are ensured not to be broken due to transitional extrusion, and the structural strength and the use reliability of the current collector are ensured. By setting the height H of the third protrusion 3 The relation is satisfied: h 3 ＝H 1 D, that is to say the thickness of the third projection plus the current collector is equal to the height of the first projection, and the thickness of the fourth projection plus the current collector is equal to the height of the first projection, the first connection portion being coplanar with the end face of the first projection remote from the first body after assembly of the end cap assembly. After the end cover assembly is assembled with the battery cell, the structural strength of the end cover assembly can be improved, the current collector and the first protrusion can uniformly apply an abutting force to the tab group, partial tabs are prevented from being in transitional abutting connection or insufficient abutting connection, the integral abutting effect of the end cover assembly to the tab group is improved, the probability of everting the tabs is further reduced, and the safety performance and the use reliability of the battery are better guaranteed.
In a possible implementation manner, the third protrusion is provided with a first positioning portion, the first positioning portion protrudes from the second limiting surface, the fourth protrusion is provided with a second positioning portion, the second positioning portion protrudes from the third limiting surface, along the axis direction of the insulating piece, the second connecting portion is located between the first positioning portion and the first body, the second connecting portion is located between the second positioning portion and the first body, and the first positioning portion and the second positioning portion are used for fixing the second connecting portion.
It can be understood that through setting up first location portion and second location portion, can fix second connecting portion, not only can improve the fixed strength of insulating part to second connecting portion, and then improve the joint strength of second connecting portion and the butt portion of utmost point post, guarantee end cover assembly's structural strength and use reliability, can also improve the convenience of buckling of first kink to improve end cover assembly's assembly efficiency.
In a second aspect, the application provides a battery, including electric core and above-mentioned end cover subassembly, electric core includes electric core body and utmost point ear group, and utmost point ear group includes first contact portion, and first contact portion contacts with the terminal surface of electric core body, and first contact portion includes first end and second end, and first end is close to the axis of electric core body for the second end, along the axis direction of first body, and the projection of first end on first body falls into the projection scope of first arch on first body.
It can be appreciated that, along the radial direction of the cell body, the first protrusion can at least abut against the first end of the tab set. Because the second end of utmost point ear group is connected with electric core body, consequently if with first end butt fixed, avoid first end to keep away from the terminal surface of electric core body after the turning up after the electrolyte in battery assembly process or injection, just can significantly reduce the probability that the utmost point ear turned up to guarantee the security performance and the reliability of use of battery. Through setting up the projection of first end on first body and falling into first protruding in the projection of first body, not only can make the part of the tab group that first connecting portion did not cover by first protruding butt, can make moreover have the clearance between the periphery of first protruding and first body, the component interference when reducing the battery assembly improves the assembly efficiency of battery, in addition, can also reduce first bellied material use amount, lighten the weight of end cover subassembly to improve battery energy density.
In a third aspect, the present application provides an energy storage device, including a plurality of the batteries, where the plurality of batteries are electrically connected, and an electrical connection manner of the plurality of batteries includes at least one of series connection and parallel connection.
Drawings
In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.
FIG. 1 is a schematic illustration of an end cap assembly provided in an embodiment of the present application;
FIG. 2 is an exploded schematic view of the end cap assembly of FIG. 1;
fig. 3 is a schematic view of a current collector (unfolded) according to an embodiment of the present application;
FIG. 4 is a schematic structural view of an insulator according to an embodiment of the present application;
fig. 5 is a schematic bottom view of an end cap assembly (current collector not folded) provided in an embodiment of the present application;
fig. 6 is a schematic bottom view of an end cap assembly (with a current collector folded) provided in an embodiment of the present application;
fig. 7 is a schematic structural view of a battery according to an embodiment of the present application;
FIG. 8 is an exploded view of the battery shown in FIG. 7;
fig. 9 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.
Reference numerals:
the end cap assembly 100,
the insulator 20, the first body 21, the first post through hole 211, the first explosion-proof valve through hole 212, the limiting portion 213, the first protrusion 22, the first limiting surface 22a, the first portion 221, the second portion 222, the second protrusion 23, the second circular arc segment 231, the second circular arc sub-segment 232, the third protrusion 24, the second limiting surface 24a, the first positioning portion 241, the fourth protrusion 25, the third limiting surface 25a, the second positioning portion 251, the receiving groove 26, the notch 27, the enclosing portion 28,
a pole 30, a fourth body 31, a joint portion 32, an abutment portion 33,
an end cap 40, a second post through hole 41, a second explosion proof valve through hole 42,
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The following description of the embodiments of the present application will be made with reference to the accompanying drawings.
Embodiments of the present application provide an end cap assembly, a battery, and an energy storage device. The battery comprises an end cover assembly and a battery cell, wherein the end cover assembly is electrically connected with the battery cell to lead out electrodes of the battery. When the battery is a single battery, the battery can be a cylindrical single battery. The battery can be further applied to an energy storage device, and the energy storage device can include, but is not limited to, a battery module, a battery pack, a battery system and the like.
Referring to fig. 1 and 2, fig. 1 is a schematic structural view of an end cap assembly 100 according to an embodiment of the present application, and fig. 2 is an exploded schematic view of the end cap assembly 100 shown in fig. 1.
The end cover assembly provided by the embodiment of the application comprises: current collector 10, insulator 20, post 30, end cap 40, seal ring 50, upper plastic 60, pressure block 70 and explosion-proof valve 80. The current collector 10 is electrically connected with the battery cell, the insulating member 20 and the end cover 40 are stacked, the pole 30 sequentially passes through the current collector 10, the insulating member 20 and the end cover 40 to be led out as an electrode of the battery 200, the upper plastic 60 is used for receiving the pressing block 70 and playing a role in spacing between the pole 30 and the end cover 40, the pressing block 70 is used for connecting the pole 30 and an external circuit of the battery 200, and the explosion-proof valve 80 is arranged on the end cover 40 and used for pressure relief protection of the battery 200.
Referring to fig. 3, fig. 3 is a schematic view of a current collector 10 (not folded) according to an embodiment of the present disclosure.
The current collector 10 includes a first connection portion 11, a transition portion 12, and a second connection portion 13. The first connection portion 11, the transition portion 12, and the second connection portion 13 are arranged in this order. The transition portion 12 is connected between the first connection portion 11 and the second connection portion 13 in a bent manner.
The first connecting portion 11 approximates a semi-circular structure, and the first connecting portion 11 includes a second body 111 and a welding portion 112. The second body 111 is provided with a first through hole 114 and a second through hole 115. The first through hole 114 is provided in a central region of the second body 111. The second through holes 115 are disposed in the area between the first through holes 114 and the first circular arc segment 113, the number of the second through holes 115 may be plural, and the plural second through holes 115 may be arranged at intervals. The through-hole area of the second through-hole 115 may be 3% to 5% (inclusive) of the area of the second body 111. The first through hole 114 and the second through hole 115 are used for the exhaust of the battery cell 110. The outer periphery of the second body 111 comprises a first circular arc section 113 and a connecting section 116, wherein the connecting section is connected with two ends of the first circular arc section, and the radian alpha of the first circular arc section 113 is 270 degrees less than or equal to alpha <360 degrees. Further, the arc α of the first circular arc segment 113 ranges from 270 to 290. Specifically, the arc α of the first arc segment 113 may be, but is not limited to, 270 °, 272 °, 274 °, 275 °, 276 °, 278 °, 280 °, 282 °, 284 °, 285 °, 286 °, 288 °, 290 °, etc. The welding part 112 is disposed on a surface of the second body 111, the welding part 112 extends from an axis of the second body 111 to a periphery of the second body 111, the welding part 112 intersects with the periphery of the second body 111 of the first connection part 11, and the welding part 112 is used for electrically connecting with the battery cell 110. The shape of the weld 112 may be similar to an X-shape, a K-shape, a V-shape, a U-shape, a semi-circular arc, a cross shape, or other shapes. Illustratively, the weld 112 is shaped like an X. By arranging the welding portion 112 to intersect with the periphery of the second body 111, each ring of tab 151 of the battery cell 110 in the radial direction of the first connection portion 11 can be welded with the first connection portion 11 at least partially, so that the welding area and welding effect of the current collector 10 and the battery cell 110 are ensured, the overcurrent capability and performance of the battery 200 are ensured, and the safety performance and the use reliability of the battery 200 are improved.
The transition portion 12 is approximately a plate-like structure, and the transition portion 12 includes a third body 121, a first bending portion 122, and a second bending portion 124. The third body 121 is provided with reinforcing ribs 126, the extending direction of the reinforcing ribs 126 is parallel to the arrangement direction of the first connecting portion 11 and the second connecting portion 13, and the number of the reinforcing ribs 126 is at least one. The first bending portion 122 is connected to and disposed at one end of the third body 121, and the second bending portion 124 is connected to and disposed at the other end of the third body 121. The first bending part 122 is used for connecting the first connecting part 11 and the third body 121, and the second bending part 124 is used for connecting the third body 121 and the second connecting part 13. The first bending part 122 is provided with a first concave part 123, the first concave part 123 is located at the end part of the first bending part 122, the second bending part 124 is provided with a second concave part 125, the second concave part 125 is located at the end part of the second bending part 124, and the first concave part 123 and the second concave part 125 are used for improving convenience of bending.
The second connecting portion 13 is of a plate-shaped structure, the second connecting portion 13 is provided with a third through hole 131 and a concave portion 132, the third through hole 131 is used for allowing the pole 30 to pass through, the concave portion 132 is arranged at one end, far away from the transition portion 12, of the second connecting portion 13, and the concave portion 132 is used for foolproof installation of the current collector 10.
When the current collector 10 is folded (see fig. 2), the current collector 10 has a substantially S-shaped structure. The first connecting portion 11 is connected to the third body 121 through a first bending portion 122, and the second connecting portion 13 is connected to the third body 121 through a second bending portion 124. The projection of the second connecting portion 13 onto the transition portion 12 along the axial direction of the first connecting portion 11 is located in the transition portion 12, and the projection of the transition portion 12 onto the first connecting portion 11 along the axial direction of the first connecting portion 11 is located in the first connecting portion 11.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an insulating member according to an embodiment of the present application.
The insulator 20 includes a first body 21, a first protrusion 22, a second protrusion 23, a third protrusion 24, and a fourth protrusion 25. The first protrusion 22, the second protrusion 23, the third protrusion 24 and the fourth protrusion 25 are all protruded on the first body 21. The first protrusion 22 is used for abutting against a tab of the battery cell 110. The third and fourth bosses 24, 25 are adapted to receive the header 10. The first body 21 is provided with a first pole through hole 211, a first explosion-proof valve through hole 212 and a limiting part 213, the first pole through hole 211 is arranged at the center of the first body 21, the first pole through hole 211 is used for allowing the pole 30 to pass through, and the first explosion-proof valve through hole 212 is used for providing a channel for discharging gas in the battery 200 to the explosion-proof valve 80. The limiting part 213 is in a V-shaped structure, along the radial direction of the first body 21, the limiting part 213 is located between the third protrusion 24 and the fourth protrusion 25, and the limiting part 213 is used for limiting the current collector 10 in cooperation with the recess 132.
The first protrusion 22 includes a first stop surface 22a, a first portion 221, and a second portion 222. The first portion 221 has a plate-like structure, and the extending directions of both ends of the first portion 221 intersect with the second protrusions 23, respectively, and the second portion 222 connects the first portion 221 and the second protrusions 23. The first limiting surface 22a is disposed parallel to the first body 21, and the first limiting surface 22a is used for limiting the current collector 10.
The second protrusion 23 is a curved plate-like structure, and the second protrusion 23 extends along the periphery of the first body 21. The inner side surface of the second protrusion 23 and the first body 21 form a receiving groove 26, and the first protrusion 22, the third protrusion 24 and the fourth protrusion 25 are located in the receiving groove 26. The two ends of the second protrusion 23 are matched with the first body 21 to form a notch 27, and the notch 27 is opposite to the first protrusion 22 along the radial direction of the first body 21. The outer periphery of the second protrusion 23 includes a second arc segment 231, and the arc degree β of the second arc segment 231 is smaller than the arc degree α of the first arc segment, specifically, the arc degree 0 ° < β+.ltoreq.270° of the second arc segment 231. Further, the arc degree beta of the second arc segment 231 is in the range of 260 DEG.ltoreq.beta.ltoreq.270°. Specifically, the radian β of the second circular arc segment 231 may be, but is not limited to, 260 °, 261 °, 262 °, 263 °, 264 °, 265 °, 266 °, 267 °, 268 °, 269 °, 270 °, and the like. The outer periphery of the portion of the second protrusion 23 that is intersected by the first limiting surface 22a and opposite to the first protrusion 22 is a second arc sub-segment 232, and the radian γ (please refer to fig. 5) of the second arc sub-segment 232 satisfies the relationship: γ=360° - α.
The second protrusion 23 is truncated by the first limiting surface 22a, and a portion opposite to the first protrusion 22 and a portion of the first protrusion 22 where the first limiting surface 22a is located form an enclosing portion 28, and at least a portion of the enclosing portion 28 is filled with the second portion 222. The enclosure 28 may be entirely filled with the second portion 222 or may be partially filled with the second portion 222. The second portions 222 are exemplified by a plate-like structure, the number of the second portions 222 is plural, and the plural second portions 222 are disposed in the enclosure portion 28 at equal intervals. That is, the first protrusion 22 is substantially in a comb-tooth structure, and a portion of the enclosing portion 28 is filled with the second portion 222. Through setting up that first arch 22 is approximately the broach structure, enclose the part of closing portion 28 and be filled by second portion 222, both can guarantee the butt effect of second portion 222 to the tab group, reduce the probability that the tab turns up, can reduce the material use of second portion 222 again, lighten the weight of insulator 20, and then be favorable to improving the energy density of battery.
The third protrusion 24 is in a comb-tooth structure, along the direction of the notch 27 towards the first protrusion 22, the third protrusion 24 is located between the notch 27 and the first protrusion 22, and one end of the third protrusion 24 away from the axis of the first body 21 is connected with the second protrusion 23. The third protrusion 24 is provided with a second limiting surface 24a and a first positioning portion 241, the second limiting surface 24a is parallel to the axis of the first body 21, and the second limiting surface 24a is used for limiting the current collector 10. The first positioning portion 241 protrudes from the second limiting surface 24a, and the first positioning portion 241 is configured to fix the second connecting portion 13.
The fourth protrusion 25 is in a comb-tooth structure, and the fourth protrusion 25 and the third protrusion 24 are arranged opposite to each other and are all positioned in the accommodating groove 26. In the direction of the notch 27 toward the first projection 22, the fourth projection 25 is located between the notch 27 and the first projection 22, and an end of the fourth projection 25 away from the axis of the first body 21 is connected to the second projection 23. The fourth protrusion 25 is provided with a third limiting surface 25a and a second positioning portion 251, the third limiting surface 25a is parallel to the axis of the first body 21, and the third limiting surface 25a is used for limiting the current collector 10. The second positioning portion 251 protrudes from the third limiting surface 25a, the second positioning portion 251 is disposed opposite to the first positioning portion 241, and the second positioning portion 251 is also used for fixing the second connecting portion 13.
The third projection 24 and the fourth projection 25 have the same height in the axial direction of the insulating member 20, and the third projection 24 has a height H 3 The relation is satisfied: h 3 ＝H 1 D, wherein H 1 The height of the first protrusion 22 in the axial direction of the insulator 20 is D, which is the thickness of the current collector 10.
The pole 30 has a substantially nail-shaped structure, and the pole 30 includes a fourth body 31, a joint portion 32, and an abutment portion 33, the fourth body 31, the joint portion 32, and the abutment portion 33 being sequentially connected in the axial direction of the pole 30. The fourth body 31, the engagement portion 32 and the abutment portion 33 are all of a columnar structure. The height of the fourth body 31 is greater than the engaging portion 32 and the abutting portion 33, respectively, in the axial direction of the pole 30. Along the radial direction of the pole 30, the outer diameter of the fourth body 31 is smaller than the outer diameter of the engaging portion 32, and the outer diameter of the engaging portion 32 is smaller than the outer diameter dimension of the abutting portion 33.
The end cap 40 has a circular plate-like structure. The end cover 40 is provided with a second post through hole 41 and a second explosion-proof valve through hole 42, the second post through hole 41 is used for allowing the post 30 to pass through, and the second explosion-proof valve through hole 42 is used for receiving the explosion-proof valve 80.
Referring to fig. 2, 5 and 6, in the assembly process of the end cap assembly 100, the abutting portion 33 of the pole 30 may be abutted to one side of the current collector 10 away from the insulator 20, the fourth body 31 of the pole 30 sequentially passes through the third through hole 131 of the current collector 10, the first pole through hole 211 of the insulator 20, and the second pole through hole 41 of the end cap 40, and the current collector 10 is bent in an S shape through the first bending portion 122 and the second bending portion 124 of the bending transition portion 12, and the current collector 10 of the current collector 10 after bending is partially embedded in the accommodating groove 26 of the insulator 20 and contacts or is in clearance fit with the first limiting surface 22a of the first protrusion 22. After the end cap assembly 100 is assembled, the second through hole 115 of the current collector 10, the first explosion proof valve through hole 212 of the insulator 20, and the second explosion proof valve through hole 42 of the end cap 40 are disposed in communication along the axial direction of the insulator 20.
After the end cap assembly 100 is assembled, the second connection portion 13 and the transition portion 12 of the current collector 10 are embedded in the accommodating groove 26, the second connection portion 13 of the current collector 10 is in contact with the first body 21 of the insulator 20, the outer side surface of the first bending portion 122 of the current collector 10 is in contact with or clearance fit with the first limiting surface 22a of the first protrusion 22, and the surface of the current collector 10, which is close to the insulator 20, is in contact with the third protrusion 24 and the fourth protrusion 25 of the insulator 20. Wherein "inner" herein refers to a side toward the axis of the insulator 20 and "outer" refers to a side away from the axis of the insulator 20. Further, the outer side surface of the first bending part 122 of the current collector 10 is in clearance fit with the first limiting surface 22a of the first protrusion 22. By arranging the outer side surface of the first bending part 122 of the current collector 10 in clearance fit with the first limiting surface 22a of the first protrusion 22, a folding error can be reserved for the current collector 10, so that the current collector 10 can be folded smoothly, and the transition part 12 of the current collector is positioned at one side of the first protrusion 22 close to the axis of the insulating part 20; the gap also provides a displacement space for the current collector 10 when the current collector 10 is subjected to an external force, preventing the current collector 10 from being excessively pressed, thereby improving the assembly efficiency and the use reliability of the end cap assembly 100.
The multipolar ear cell generally comprises a cell body and a tab group, wherein the tab group comprises a plurality of tabs, one end of each tab is connected with the cell body, the other end of each tab is folded towards the axis position of the end face of the cell body, and the folded tab is contacted with the end face of the cell body. In the process of assembling the battery or after electrolyte is injected, the lugs of the existing multi-lug battery cell are easy to turn outwards, so that the phenomenon that the contact between the battery lug and a current collector is poor or the lug is folded and broken or even a diaphragm is punctured easily occurs, and the safety performance and the use reliability of the battery are greatly influenced.
The arc alpha of the first circular arc segment 113 of the first connection 11 ranges from 270 deg. to alpha <360 deg.. Through setting the range of the radian alpha of the first circular arc section 113 of the first connecting part 11 to be 270 degrees less than or equal to alpha <360 degrees, the first connecting part 11 of the current collector 10 can be made to be of a circular structure, the cross section of the current collector 10 along the radial direction of the first body 21 and the structural strength of the current collector 10 are increased, the coverage area and the abutting capacity of the current collector 10 on the lugs of the battery core are further improved, the phenomenon of eversion of the lugs is reduced, and therefore the safety performance and the use reliability of the battery 200 are ensured. Through setting up the joint of first protruding 22 and first connecting portion 11 joint and being used for with the butt of utmost point ear group 150, after end cover assembly 100 and electric core assembly for the part of utmost point ear group 150 that first connecting portion 11 did not cover is by first protruding 22 butt, thereby further guarantee the butt area of end cover assembly 100 to the utmost point ear of electric core, further reduce the probability that the utmost point ear turned up, thereby guarantee the security performance and the reliability in use of battery 200 better. In addition, the outer side surface of the first bending part 122 of the current collector 10 contacts with the inner side surface of the first protrusion 22, and by arranging the first protrusion 22, limiting and supporting force can be provided for the weaker first bending part 122 of the current collector 10, so that on one hand, the first bending part 122 can be prevented from being bent and extruded in a transitional manner, and on the other hand, the abutting effect of the first current collector and the tab can be enhanced, and therefore the structural strength and the use reliability of the end cover assembly 100 are ensured.
In some embodiments, the arc α of the first arc segment 113 of the first connection 11 ranges from 270 to 290. The transition 12 is connected to a side of the first through hole 114 remote from the first circular arc segment 113. Through setting the range of the radian alpha of the first arc section 113 of the first connecting part 11 to be 270 degrees or more and less than or equal to 290 degrees, after the end cover assembly 100 is assembled with the battery cell, the first connecting part 11 is ensured to have a larger coverage area to the tab group 150, and meanwhile, the first connecting part 11 and the transition part 12 are ensured to have a larger connection area, so that the overcurrent capacity and the connection strength between the first connecting part 11 and the transition part 12 are ensured, and the integral structural strength and the use reliability of the current collector 10 are improved.
In some embodiments, the arc β of the second arc segment 231 is less than or equal to the arc α of the first arc segment 113. Further, the difference between the arc α of the first arc segment 113 and the arc β of the second arc segment 231 is 0 ° to 10 ° (including the end values of 0 ° and 10 °). That is, the radian β of the second circular arc segment 231 satisfies: beta is more than or equal to 260 degrees and less than or equal to 270 degrees. By setting the radian beta of the second circular arc section 231 to be smaller than or equal to the radian alpha of the first circular arc section 113, the size of the notch 27 formed by the second bulge 23 and the first body 21 in a matched manner is moderate, on one hand, the second bulge 23 can be ensured to have better structural strength and supporting capability, and the structural strength and the use reliability of the insulating piece 20 are ensured; on the other hand, when the current collector 10 is not folded, the transition part 12 of the current collector 10 can be located in the notch 27 formed by the cooperation of the second protrusion 23 and the first body 21, that is, when the current collector 10 is not folded, the first connecting part 11, the transition part 12 and the second connecting part 13 can be located on the same plane, so that the fixation of a welding tool when the end cover assembly 100 is assembled or when the current collector 10 is assembled with a battery cell is facilitated, the stress deformation of the first bending part 122 or the second bending part 124 is reduced, the structural strength of the current collector 10 is ensured, and the assembly efficiency and the use reliability of the end cover assembly 100 are improved.
In some embodiments, the outer periphery of the portion of the second protrusion 23 that is intersected by the first limiting surface 22a and opposite to the first protrusion 22 is a second arc sub-segment 232, and the radian γ of the second arc sub-segment 232 satisfies the relationship: γ=360° - α. Through setting the sum of the radian alpha of the first circular arc segment 113 and the radian gamma of the second circular arc sub-segment 232 to 360 degrees, after the end cover assembly 100 is assembled with the battery cell, not only the part of the tab group 150 uncovered by the first connecting part 11 can be abutted by the first bulge 22, but also the first connecting part 11 and the enclosing part 28 of the current collector 10 approximately form a complete circle, so that the tab of the battery cell can be basically covered by the current collector 10 or the insulator 20, thereby ensuring the covering and abutting area of the end cover assembly 100 on the tab group 150, better reducing the probability of outward turning of the tab, and better ensuring the safety performance and the use reliability of the battery 200.
After the end cover assembly 100 is assembled, the first protrusion 22, the third protrusion 24 and the fourth protrusion 25 are located in the accommodating groove 26, and the transition portion 12 and the second connecting portion 13 are located in an area surrounded by the first limiting surface 22a, the second limiting surface 24a and the third limiting surface 25 a. Through setting up transition portion 12 and second connecting portion 13 and being located first spacing face 22a, second spacing face 24a and the regional that the third spacing face 25a encloses, can carry out spacingly to transition portion 12 and second connecting portion 13, avoid current collector 10 to take place the displacement, and then improve the joint strength and the reliability of use of end cover assembly 100.
In some embodiments, the third projection 24 and the fourth projection 25 are the same height along the axial direction of the insulator 20. Through setting up the height of third protruding 24 and fourth protruding 25 along the axial direction of insulating part 20 the same, when end cover assembly 100 and electric core assembly, perhaps when battery 200 receives external effort or battery 200 gas production makes the inside pressure of battery 200 great, can make third protruding 24 and fourth protruding 25 accept the first connecting portion 11 of collector 10 jointly, guarantee that first connecting portion 11 evenly atress to guarantee that first kink 122 and second kink 124 do not break because of being compressed by the transition, thereby guarantee the structural strength and the reliability of use of collector 10.
Further, the height H of the third protrusion 24 3 The relation is satisfied: h 3 ＝H 1 D, wherein H 1 Is the firstA height of a protrusion 22 in the axial direction of the insulator 20, D is the thickness of the current collector 10. That is, the difference in height of the third protrusions 24 and the first protrusions 22 in the axial direction of the insulator 20 is the thickness of the current collector 10. The difference between the height of the fourth protrusion 25 and the height of the first protrusion 22 is the thickness of the current collector 10. By providing the third boss 24 plus the current collector 10 to have a thickness equal to the height of the first boss 22, the fourth boss 25 plus the current collector 10 to have a thickness equal to the height of the first boss 22, the first connection portion 11 is coplanar with the end face 140 of the first boss 22 remote from the first body 21 after the end cap assembly 100 is assembled. After the end cover assembly 100 is assembled with the battery cell, the structural strength of the end cover assembly 100 can be improved, the abutting force can be uniformly applied to the tab group 150 by the current collector 10 and the first protrusion 22, partial tab is prevented from being in transitional abutting joint or insufficient abutting joint, the integral abutting effect of the end cover assembly 100 on the tab group 150 is improved, the probability of outward turning of the tab is further reduced, and the safety performance and the use reliability of the battery 200 are better ensured.
After the end cap assembly 100 is assembled, along the axial direction of the insulating member 20, the second connecting portion 13 is located between the first positioning portion 241 and the first body 21, the second connecting portion 13 is located between the second positioning portion 251 and the first body 21, and the first positioning portion 241 and the second positioning portion 251 are disposed opposite to each other and are both used for fixing the second connecting portion 13. Further, the first positioning portion 241 and the second positioning portion 251 are located at a side of the second bending portion 124 near the axis of the first body 21, and one ends of the first positioning portion 241 and the second positioning portion 251 near the second bending portion 124 are located at a connection portion between the second bending portion 124 and the second connecting portion 13. Through setting up first location portion 241 and second location portion 251, can fix the one end that second kink 124 is close to first body 21 axis, not only can improve insulating part 20 to the fixed strength of second connecting portion 13, and then improve the joint strength of second connecting portion 13 and the butt portion 33 of utmost point post 30, guarantee the structural strength and the reliability of use of end cover assembly 100, can also improve the convenience of buckling of first kink 122 to improve the assembly efficiency of end cover assembly 100.
After the end cover assembly 100 is assembled, the limiting portion 213 of the insulating member 20 abuts against the recess 132 of the current collector 10, and the limiting portion 213 of the insulating member 20 can limit and fix the current collector 10, so as to reduce the offset of the current collector 10, thereby improving the assembly efficiency of the end cover assembly 100.
After the end cap assembly 100 is assembled, the abutting portion 33 of the pole 30 is located on the side of the third through hole 131 away from the insulator 20, and the outer diameter of the abutting portion 33 of the pole 30 is larger than the outer diameter of the third through hole 131 of the current collector 10. By setting the outer diameter of the abutting portion 33 of the pole 30 to be larger than the outer diameter of the third through hole 131 of the current collector 10, not only the connection between the pole 30 and the current collector 10 and the prevention of the displacement of the abutting portion 33 along the direction of the insulating member 20 toward the end cover 40 by fixing one end of the pole 30 can be realized, but also one end of the current collector 10 can be fixed, which is beneficial to improving the assembly convenience and the connection strength of the end cover assembly 100.
Referring to fig. 7 and 8, fig. 7 is a schematic structural view of a battery 200 according to an embodiment of the present application, and fig. 8 is an exploded schematic view of the battery 200 shown in fig. 7.
The battery 200 provided in the embodiment of the present application includes: the end cap assembly 100, the battery cell 110 and the housing 130, wherein the battery cell 110 is positioned inside the housing 130, and can be protected from the external environment by the housing 130. The battery cell 110 includes a battery cell body 120 and a tab set 150, and the battery cell body 120 is connected with the end cap assembly 100 through the tab set 150.
The battery cell body 120 includes an end face 140, and the end face 140 of the battery cell body 120 is a surface of the battery cell body 120 facing the side of the end cap assembly 100. The tab set 150 includes a plurality of tabs 151, one end of each tab 151 is connected to the battery core body 120, and the other end of each tab 151 is turned inward toward the axis of the battery core body 120, and contacts the end face 140 of the battery core body 120 after being turned. The tab set 150 includes a first contact portion including a first end 152 and a second end 153, where the first end 152 is close to the axis of the cell body 120 relative to the second end 153. As can be appreciated, the contact portion between the plurality of tabs 151 and the end face 140 of the battery cell body 120 forms a first contact portion of the tab set 150, one end of the plurality of tabs 151 near the axis of the battery cell body 120 forms a first end 152 of the tab set together, and the other end of the plurality of tabs 151 is connected to the battery cell body 120 and forms a second end 153 of the tab set 150 together. When the battery cell 110 is assembled with the end cap 40, the projection of the first end 152 on the first body 21 falls into the projection of the first protrusion 22 on the first body 21 along the axial direction of the first body 21. That is, along the radial direction of the cell body 120, the first protrusion 22 can at least abut against the first end 152 of the tab set 150. Since the second end 153 of the tab set 150 is connected with the battery core body 120, if the first end 152 is abutted and fixed, the probability of the tab 151 turning outward can be greatly reduced to ensure the safety performance and the use reliability of the battery 200 by avoiding the first end 152 from turning outward after leaving the end face 140 of the battery core body 120 in the assembling process of the battery 200 or after injecting electrolyte. By arranging the projection of the first end 152 on the first body 21 to fall into the projection of the first protrusion 22 on the first body 21, not only the part of the tab group 150 uncovered by the first connection part 11 can be abutted by the first protrusion 22, but also a gap can be formed between the first protrusion 22 and the periphery of the first body 21, so that the component interference during the assembly of the battery 200 is reduced, the assembly efficiency of the battery 200 is improved, in addition, the material usage amount of the first protrusion 22 can be reduced, the weight of the end cover assembly 100 is reduced, and the energy density of the battery 200 is improved.
Wherein the battery 200 is a secondary battery. Such as nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead-storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, and the like. In other embodiments, the battery 200 may also be a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, or a sodium ion battery, or a magnesium ion battery, etc. The battery 200 may be rectangular, cylindrical, or other shape. In the present embodiment, the battery 200 is a cylinder.
It should be understood that the battery 200 described in the examples of the present application is only one form of the battery 200 to which the end cap assembly is applied, and should not be construed as limiting the battery 200 provided in the present application or the end cap assembly 100 provided in the various embodiments of the present application.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an energy storage device 300 according to an embodiment of the disclosure. The energy storage device 300 provided in the embodiment of the present application includes: the housing 310 and the plurality of batteries 200 are electrically connected and each of the plurality of batteries 200 is located inside the housing 310, which can be protected from the external environment by the housing 310. In this embodiment, one energy storage device 300 includes a plurality of batteries 200. The plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 may be connected in series, or in parallel, or a mixture of series and parallel to achieve a larger capacity and power.
It should be understood that the energy storage device 300 described in the embodiments of the present application is only one form of the energy storage device 300 to which the battery 200 is applied, and should not be construed as limiting the energy storage device 300 provided in the embodiments of the present application or as limiting the battery 200 provided in the various embodiments of the present application.
It is noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" means two or more than two, unless specifically defined otherwise.
Reference herein to "an embodiment" 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 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 description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
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 (10)
1. An end cap assembly, comprising: the insulator comprises a first body and a first bulge, the first bulge is arranged on the first body in a protruding mode, the insulator is provided with a containing groove, the current collector is partially embedded in the containing groove and is in contact with or clearance fit with the first bulge, the current collector comprises a first connecting portion, the first connecting portion and the first bulge are matched to be in butt joint with a tab group, the outer periphery of the first connecting portion comprises a first circular arc section and a connecting section, the connecting section is connected with two ends of the first circular arc section, and the radian alpha of the first circular arc section is 270 degrees less than or equal to alpha <360 degrees.
2. The end cap assembly of claim 1, wherein the arc of the first arc segment a ranges from 270 ° to 290 °.
3. The end cap assembly of claim 1, wherein the insulator further comprises a second protrusion extending along the periphery of the first body, the inner side of the second protrusion and the first body form the accommodating groove, the first protrusion is located in the accommodating groove, two ends of the second protrusion and the first body cooperate to form a notch, the notch is arranged opposite to the first protrusion along the radial direction of the first body, and the outer periphery of the second protrusion comprises a second arc section, and the radian beta of the second arc section is smaller than or equal to the radian alpha of the first arc section.
4. The end cap assembly of claim 3, wherein the first protrusion is provided with a first limiting surface parallel to the first body axis, the current collector is in clearance fit with the first limiting surface, a portion of the second protrusion, which is cut by the first limiting surface and opposite to the first protrusion, forms a surrounding portion with the first protrusion, the surrounding portion is at least partially filled by the first protrusion, an outer periphery of a portion of the second protrusion, which is cut by the first limiting surface and opposite to the first protrusion, is a second arc subsection, and an radian γ of the second arc subsection satisfies the following relation: γ=360° - α.
5. The end cap assembly of claim 4, wherein the first projection includes a first portion and a second portion, the second portion connecting the first portion and the second projection, the first stop surface being an outer side of the first portion proximate the current collector, the second portion being located within the enclosure, a portion of the enclosure being filled by the second portion.
6. The end cap assembly of claim 4, wherein the current collector further comprises a transition portion and a second connection portion, the transition portion being crimped between the first connection portion and the second connection portion; the insulator further comprises a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion are oppositely arranged and are both located in the accommodating groove, the gap faces the first protrusion, the third protrusion and the fourth protrusion are located between the gap and the first protrusion, the third protrusion is provided with a second limiting surface parallel to the first body axis, the fourth protrusion is provided with a third limiting surface parallel to the first body axis, the first connecting portion is in contact with the third protrusion and the fourth protrusion, and the transition portion and the second connecting portion are located in an area surrounded by the first limiting surface, the second limiting surface and the third limiting surface.
7. The end cap assembly of claim 6, wherein the third projection and the fourth projection are the same height in the axial direction of the insulator, the third projection having a height H 3 The relation is satisfied: h 3 ＝H 1 D, wherein H 1 And D is the thickness of the current collector, wherein the height of the first bulge along the axial direction of the insulator is the height of the first bulge.
8. The end cap assembly of claim 6, wherein the third protrusion is provided with a first positioning portion protruding from the second limiting surface, the fourth protrusion is provided with a second positioning portion protruding from the third limiting surface, the second connecting portion is located between the first positioning portion and the first body along the axial direction of the insulating member, and the second connecting portion is located between the second positioning portion and the first body, and the first positioning portion and the second positioning portion are used for fixing the second connecting portion.
9. A battery characterized by comprising a battery cell and the end cover assembly of any one of claims 1-8, wherein the battery cell comprises a battery cell body and a tab set, the tab set comprises a first contact part, the first contact part is in contact with an end face of the battery cell body, the first contact part comprises a first end and a second end, the first end is close to an axis of the battery cell body relative to the second end, along an axis direction of the first body, and a projection of the first end on the first body falls into a projection range of the first projection on the first body.
10. An energy storage device comprising a housing and a plurality of the cells of claim 9, wherein a plurality of the cells are electrically connected, wherein the plurality of cells are electrically connected in at least one of series and parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310389233.4A CN116231179B (en) | 2023-04-12 | 2023-04-12 | End cap assembly, battery and energy storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310389233.4A CN116231179B (en) | 2023-04-12 | 2023-04-12 | End cap assembly, battery and energy storage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116231179A true CN116231179A (en) | 2023-06-06 |
| CN116231179B CN116231179B (en) | 2024-07-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310389233.4A Active CN116231179B (en) | 2023-04-12 | 2023-04-12 | End cap assembly, battery and energy storage device |
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Cited By (1)
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| CN117080634A (en) * | 2023-09-15 | 2023-11-17 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
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| CN117080634A (en) * | 2023-09-15 | 2023-11-17 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
| CN117080634B (en) * | 2023-09-15 | 2023-12-22 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
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| Publication number | Publication date |
|---|---|
| CN116231179B (en) | 2024-07-23 |
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