CN115377577B - End cover assembly, battery sealing method, battery module and electric equipment - Google Patents
End cover assembly, battery sealing method, battery module and electric equipment Download PDFInfo
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- CN115377577B CN115377577B CN202211185904.7A CN202211185904A CN115377577B CN 115377577 B CN115377577 B CN 115377577B CN 202211185904 A CN202211185904 A CN 202211185904A CN 115377577 B CN115377577 B CN 115377577B
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- Prior art keywords
- cover plate
- battery
- housing
- end opening
- cover
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- 238000007789 sealing Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 46
- 230000009471 action Effects 0.000 claims abstract description 30
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims description 48
- 230000008859 change Effects 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 37
- 230000004044 response Effects 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 36
- 239000007924 injection Substances 0.000 claims description 36
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 10
- 230000006903 response to temperature Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 16
- 238000003466 welding Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012811 non-conductive material Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application discloses an end cover assembly, a battery, a sealing method of the battery, a battery module and electric equipment. According to the end cover assembly, the battery, the sealing method of the battery, the battery module and the electric equipment, the cover plate made of the material capable of deforming under the extrusion action can be extruded in the shell of the battery, and meanwhile, the cover plate is further deformed under the extrusion action of the deformation part, so that the cover plate can be tightly extruded and connected in the shell, the sealing of the cover plate on the opening of the shell is realized, the cover plate is not required to be welded with the shell, and the assembly efficiency of the battery is improved and the assembly cost of the battery is reduced.
Description
Technical Field
The application relates to the technical field of new energy, in particular to an end cover assembly, a battery sealing method, a battery module and electric equipment.
Background
In recent years, with the development of new energy technology, secondary batteries are becoming more and more important in daily life, and lithium ion batteries are widely applied to various industries such as vehicles, electronic products, energy storage systems and the like due to the advantages of small volume, high energy density, long service life, environmental protection and the like.
At present, when a conventional large-size lithium ion battery is assembled, openings are usually formed at two ends of a shell of the lithium ion battery, a battery core is firstly installed in the shell of the battery during assembly, then positive and negative lugs of the battery core are respectively connected with positive and negative cover plates through positive and negative current collecting plates so as to realize connection with positive and negative poles on the positive and negative cover plates, and after connection is completed, the positive and negative cover plates are welded at the openings at the two ends of the shell so as to ensure that the positive and negative cover plates respectively seal the openings at the two ends of the shell. The assembly mode is complex, two ends of the shell are welded with the cover plate, the assembly process is complex and long, and the assembly efficiency and the assembly cost of the lithium ion battery are affected.
Disclosure of Invention
The embodiment of the application discloses an end cover assembly, a battery sealing method, a battery module and electric equipment, which can simplify the assembly process of the battery, and are beneficial to improving the assembly efficiency of the lithium ion battery and reducing the assembly cost of the lithium ion battery.
To achieve the above object, in a first aspect, the present application discloses an end cap assembly, the battery including a case having a first end opening, the end cap assembly comprising:
the cover plate is used for being connected with the shell so as to cover the opening at the first end, the cover plate is configured to be made of a material capable of deforming under the extrusion action, and a first through hole is formed in the cover plate; and
the pole penetrates through the first through hole and is connected with the cover plate, at least part of the pole connected with the cover plate is formed into a deformation part, and the deformation part is configured to deform and squeeze the cover plate in response to temperature change so as to enable the cover plate to be sealed at the first end opening of the shell.
By providing a cover plate configured to employ a material capable of deforming under a pressing action, at least a portion of the bond post connected to the cover plate is formed as a deformed portion, and the deformed portion is configured to deform in response to a change in temperature to press the cover plate. Accordingly, when the end cap assembly is applied to a battery and assembled to a case of the battery, firstly, a cap plate of a material capable of being deformed by a pressing action can be press-coupled in the case, and secondly, since the deformation portion can be deformed to press the cap plate in response to a change in temperature, the cap plate can be further deformed by the pressing action of the deformation portion, so that the cap plate can be press-coupled tightly in the case, thereby achieving sealing of the cap plate to an opening of the case. Therefore, the end cover assembly replaces the mode that a metal cover plate is welded on the shell to seal the opening of the shell in the related technology, saves welding procedures, effectively simplifies the assembly process of the battery, and is beneficial to improving the assembly efficiency of the battery and reducing the assembly cost of the battery.
In an alternative embodiment, the cover plate is made of a non-metallic material. Therefore, the cover plate is more selective in material, metal materials are not necessarily selected, and the welding mode is needed, so that the material selection space is larger.
In an alternative embodiment, the cover plate is a rubber cover plate. The rubber cover plate has certain deformation capacity, high temperature resistance and sealing performance, so that when the cover plate is mounted on the shell of the battery, the sealing between the cover plate and the shell can be realized by utilizing the material performance of the cover plate, and when the deformation part deforms and extrudes the cover plate in response to the change of temperature, the cover plate can deform under the extrusion action, so that the sealing condition between the cover plate and the shell is further enhanced, and the sealing reliability of the cover plate and the shell is improved.
In an alternative embodiment, the penetrating direction of the first through hole is a first direction, and the direction in which the deformation portion deforms in response to a change in temperature is a second direction, and the second direction is not parallel to the first direction.
Because the direction of the first through hole is usually the opening direction of the shell, the deformation direction of the deformation part in response to the change of temperature is not parallel to the first direction, so that the deformation direction of the deformation part can deform towards the direction forming an angle with the first direction, the shell is conveniently extruded along the direction forming an angle with the first direction by extruding the cover plate, the cover plate can be firmly and hermetically connected in the shell, and the cover plate is prevented from being separated from the opening direction of the shell.
In an alternative embodiment, the first through hole includes a first portion and a second portion connected with the first portion and forming a step surface with the first portion, the pole includes a column portion and a head portion, the column portion is disposed through the first portion, the head portion is disposed through the column portion and is disposed through the second portion in an interference manner, and the head portion is carried on the step surface, and the head portion is formed into the deformation portion.
In this way, on the premise that the deformation part can respond to the temperature change part to squeeze the cover plate, the pole can still keep the performance of the pole, namely, the pole part of the pole can be used for being electrically connected with the pole lug of the battery core, so that the electrical performance of the battery is ensured.
In an alternative embodiment, the second portion further has a side wall surface connected to the step surface, and the peripheral surface of the head portion is interference-connected to the side wall surface of the second portion to deform in response to a change in temperature to press the cover plate.
In this way, the head portion can deform in response to a temperature change, so that the cover plate can be pressed in the circumferential direction of the head portion, and then the cover plate is subjected to a pressing action in the circumferential direction of the head portion, so that the cover plate can further press the housing of the battery in the circumferential direction, the cover plate is more firmly connected in the housing, and the sealing property of the cover plate to the housing is improved.
In an alternative embodiment, the material of the cylindrical portion is different from the material of the deformation portion. Therefore, the whole pole is not required to be set to be the material of the deformation part, the pole can be selected according to different conditions, for example, the material of the column part of the pole can be conductive material, the material of the deformation part can be conductive or nonconductive material, the material selection range is wider, and meanwhile, the cost of the material of the deformation part adopted by the whole pole can be reduced.
In an alternative embodiment, the cover plate or the pole is provided with a through liquid injection hole, and the liquid injection hole is connected with a sealing nail in a sealing way. The design of annotating the liquid hole can make the accessible annotate the liquid hole and annotate liquid to the battery inside when annotating the liquid, realizes the notes liquid function of battery.
In addition, when setting up the notes liquid hole on the utmost point post, compare in the mode that sets up notes liquid hole on the apron, can reduce and annotate the liquid hole and receive impurity jam or be the probability of being scratched.
In an alternative embodiment, the sealing spike is configured to employ a material that deforms in response to a change in temperature. The sealing nails are made of materials which deform in response to temperature change, so that the sealing reliability of the sealing nails to the liquid injection holes can be further improved.
In addition, when setting up annotating the liquid hole on the utmost point post, because this sealing nail can respond the temperature variation and warp equally, therefore this sealing nail also can produce the extrusion to the utmost point post even be located the apron of utmost point post periphery to further increase the extrusion to the apron, make the extrusion that the apron received bigger, and then make the apron can more firmly extrude in the casing, improve the leakproofness of apron to the casing.
In a second aspect, the present application discloses a battery that may include
A housing having a first end opening;
the battery cell is accommodated in the shell and provided with a tab; and
the end cap assembly according to the first aspect, wherein the pole is electrically connected to the tab, the cover plate is at least partially located in the housing and connected to the housing, and the cover plate is configured to seal the first end opening under the pressing action of the deformation portion.
At least a portion of the connection between the pole and the cover plate is formed into a deformation portion, and the deformation portion is configured to deform in response to a change in temperature so that the cover plate is sealed to the first end opening under the extrusion action of the deformation portion. Therefore, even if welding is not needed, the cover plate can be used for sealing the opening of the first end of the shell, and the mode that the metal cover plate is welded on the shell in the related technology is replaced, so that the assembly process of the battery can be simplified, the assembly efficiency of the battery is improved, and the assembly cost of the battery is reduced.
In an alternative embodiment, the cover plate is interference-connected in the housing. Like this, the apron can be when not receiving the extrusion effect of deformation portion can extrude earlier in the casing, realizes the preliminary seal of apron to the casing, then the extrusion effect of rethread deformation portion realizes the further seal of apron to the casing, double extrusion sealed mode for the extrusion seal effect of apron and casing is stronger, and then can ensure the leakproofness of apron to the casing.
In an alternative embodiment, a joint between the inner wall surface of the housing and the outer peripheral surface of the cover plate forms a pressing portion for pressing the outer peripheral surface of the cover plate.
The cover plate can be extruded from the inner wall of the shell to the middle part of the shell, and meanwhile, the pole is usually positioned on the inner side of the outer peripheral surface of the cover plate, so that the deformation part can extrude the cover plate from the middle part of the shell to the inner wall surface of the shell, the cover plate is further subjected to double extrusion force effects in two different directions, the situation that the cover plate is extruded by the shell and possibly separated from the shell is avoided, and the cover plate can be extruded in the shell more firmly.
Preferably, the deformation part deforms in response to the change of temperature so that the acting force for extruding the cover plate is larger than the extruding acting force of the cover plate by the extruding part, so that the extruding action of the deformation part on the cover plate is larger, the cover plate can reversely extrude the shell from the middle part of the shell to the direction of the inner wall surface of the shell, and the cover plate is sealed in the shell more firmly.
In an alternative embodiment, the inner wall surface of the housing is at least partially convex toward the middle of the housing to form the pressing portion. Thus, the area of the pressing portion is smaller than the entire area of the inner wall surface of the housing, and the pressing action on the cover plate is stronger.
In an alternative embodiment, the shell has a first end face, the first end face is provided with the first end opening, the first end face is provided with a limiting part extending towards the inside of the first end opening, and the limiting part is used for being abutted with the upper surface of the cover plate so as to limit the cover plate from being separated from the first end opening.
Through the setting of the spacing portion of casing, can avoid the apron to deviate from in the first end opening to make the apron can seal in the casing more firmly.
In an alternative embodiment, the housing further has a second end opening opposite the first end opening, the battery further comprising a bottom cover welded to the housing to seal the second end opening;
the electrode tab comprises a first electrode tab and a second electrode tab with polarity opposite to that of the first electrode tab, the first electrode tab faces the first end opening, the second electrode tab faces the second end opening, the electrode post is electrically connected with the first electrode tab, and the bottom cover is electrically connected with the second electrode tab.
Through the bottom welding in the second end opening of casing, the bottom electricity is connected in the second ear simultaneously to can realize the multiplexing of structure of bottom, need not to additionally set up the utmost point post of being connected with this second ear electricity at the bottom, save utmost point post and second ear welded process, when reducing the use of the part of battery, still further simplified the equipment process of battery, be favorable to reducing the equipment cost of battery.
In an alternative embodiment, a pressure relief part is formed between the bottom cover and the shell, and the pressure relief part is used for blasting when the air pressure in the shell reaches a preset value so as to realize pressure relief in the shell. Therefore, the pressure relief part formed between the bottom cover and the shell can realize the pressure relief function of the battery, so that the explosion caused by the fact that the battery cannot timely relieve pressure due to the accumulation of internal gas is prevented, and the use safety of the battery is improved.
In addition, through forming this pressure release portion between bottom and casing, can also realize the structure multiplexing, need not to additionally set up the design of explosion-proof valve on the bottom lid, further reduce the use of the part of battery to and further simplify the equipment process of battery.
In an alternative embodiment, the pressure relief portion is configured to deform in response to a change in temperature, the pressure relief portion being formed at a welded portion of the bottom cover and the case, or the pressure relief portion being formed at the bottom cover. Therefore, the pressure relief part is configured to deform in response to the change of temperature, so that the pressure relief part is more sensitive to temperature sensing, can timely relieve pressure, and is beneficial to improving the use safety of the battery.
In an alternative embodiment, the bottom cover is made of a memory alloy material, and/or the thickness of the bottom cover at the pressure relief portion is smaller than the thickness of the bottom cover at other positions except the pressure relief portion.
The bottom adopts the memory alloy material to when the welded part of bottom and casing forms this pressure release portion or bottom self part forms pressure release portion, can be because the coefficient of thermal expansion of memory alloy material is inconsistent with the coefficient of thermal expansion of casing, thereby make this pressure release portion can in time take place to break, ensure the normal clear of pressure release function.
The bottom cover is arranged at the pressure relief part in a mode that the thickness of the bottom cover is smaller than that of other positions except the pressure relief part, so that the bottom cover is easier to deform at the pressure relief part, and therefore when the internal gas aggregation of the battery reaches a preset value, the pressure relief part is easier to break in time, and the normal operation of a pressure relief function is ensured.
In a third aspect, the application also discloses a battery module, which comprises the battery according to the second aspect. The battery module with the battery can also have the effects of improving the assembly efficiency of the battery and reducing the assembly cost of the battery.
In a fourth aspect, the application also discloses electric equipment, which can comprise the battery according to the second aspect or the battery module according to the third aspect. Likewise, the electric equipment with the battery has the effects of improving the assembly efficiency of the battery and reducing the assembly cost of the battery.
In a fifth aspect, the present application also discloses a method for sealing a battery, the method comprising:
providing a housing having a first end opening;
accommodating a battery cell in the housing;
providing an end cover assembly, wherein the end cover assembly comprises a cover plate and a pole, the pole is penetrated through a first through hole of the cover plate and connected with the cover plate, and at least part of the connection between the pole and the cover plate is formed into a deformation part;
the pole post is electrically connected with the pole lug of the electric core;
mounting the cover plate to the housing such that the cover plate is at least partially positioned in the housing and covers the first end opening;
And heating the deformation part to enable the deformation part to deform in response to temperature change so as to squeeze the cover plate, so that the cover plate is sealed at the first end opening.
Through the setting of this deformation portion, install in the casing at the apron and make apron at least part be arranged in the casing thick, can heat this deformation portion for this deformation portion response temperature variation takes place to warp and then extrudees this apron, makes this apron seal in this first end opening, from this, the equipment method of this battery need not to weld apron and casing, effectively simplifies the equipment process of battery, and then is favorable to improving the packaging efficiency of battery and reduces the equipment cost of battery.
Compared with the prior art, the application has the beneficial effects that:
according to the end cover assembly, the battery assembly method, the battery module and the electric equipment provided by the embodiment of the application, the cover plate is configured to be made of a material capable of deforming under the extrusion action, at least part of the binding pole connected with the cover plate is formed into the deformation part, and the deformation part is configured to deform to extrude the cover plate in response to the change of temperature. Accordingly, when the end cap assembly is applied to a battery and assembled to a case of the battery, firstly, a cap plate of a material capable of being deformed by a pressing action can be press-coupled in the case, and secondly, since the deformation portion can be deformed to press the cap plate in response to a change in temperature, the cap plate can be further deformed by the pressing action of the deformation portion, so that the cap plate can be press-coupled tightly in the case, thereby achieving sealing of the cap plate to an opening of the case. Therefore, the end cover assembly replaces the mode that a metal cover plate is welded on the shell to seal the opening of the shell in the related technology, saves welding procedures, effectively simplifies the assembly process of the battery, and is beneficial to improving the assembly efficiency of the battery and reducing the assembly cost of the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments 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 only 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 view of a structure of a battery of the present application (a liquid filling hole is provided in a cover plate);
FIG. 2 is an enlarged view of a portion at A of FIG. 1;
fig. 3 is a schematic view of the structure of the battery (the post is omitted) in fig. 1;
FIG. 4 is a schematic view of another structure of the battery of the present application (the liquid injection hole is provided in the post);
fig. 5 is a partial enlarged view at B in fig. 4;
FIG. 6 is a partial enlarged view at C in FIG. 1;
fig. 7 is a flowchart of a battery assembly method of the present application.
Reference numerals mainly
100. A battery; 10. a housing; 11. a first end opening; 12. an extrusion part; 13. a first end face; 13a, a limiting part; 20. a battery cell; 21. a tab; 30. an end cap assembly; 31. a cover plate; 310. a first through hole; 310a, a first portion; 310b, a second portion; 3101. a step surface; 311. the upper surface of the cover plate; 312. a liquid injection hole; 312a, sealing nails; 32. a pole; 32a, a column portion; 32b, a head portion; 320. a first surface; 321. a second surface; 40. a transfer sheet; 50. a bottom cover; 51. and a pressure relief part.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "mounted," "disposed," "configured," "connected," "coupled" and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The application discloses an end cover assembly, a battery, an assembling method of the battery, a battery module and electric equipment. The end cap assembly is applicable to a battery for covering at least one end opening of a case of the battery. The end cap assembly may be applied to a cylindrical battery or a prismatic battery, for example, when the battery is a cylindrical battery, the end cap assembly may be coupled to an end opening of a cylindrical case of the cylindrical battery, and a cap plate of the end cap assembly may be, for example, a circular cap plate to fit the cylindrical case of the cylindrical battery. When the battery is a square battery, the end cover can be connected to an opening at one end of a square shell of the square battery, and meanwhile, a square cover plate can be adopted by the cover plate of the end cover assembly to adapt to the square shell. It can be seen that the end cap assembly of the present application is applicable to both square cells and cylindrical cells, and may be specifically selected according to practical situations, and the embodiment is not specifically limited thereto.
In order to facilitate explanation of the specific structure of the end cap assembly, the technical solution of the present application will be further explained with reference to the examples and the accompanying drawings, and in order to facilitate understanding, the present embodiment will be explained by taking the battery as a cylindrical battery as an example.
Referring to fig. 1 to 4, the battery 100 may include a housing 10, a battery cell 20 and an end cap assembly 30, the housing 10 has a first end opening 11, the battery cell 20 may be accommodated in the housing 10, and the battery cell 20 has a tab 21. The end cap assembly 30 includes a cap plate 31 and a post 32, the cap plate 31 being configured to be made of a material capable of being deformed by compression so that when the end cap assembly 30 is applied to the battery 100, the cap plate 31 is adapted to be mounted to the case 10 of the battery 100, and so that the cap plate 31 is compressed in the case 10 of the battery 100, thereby achieving a compression connection of the cap plate 31 with the case 10 of the battery 100. The cover plate 31 may be provided with a first through hole 310 therethrough, and the first through hole 310 may be formed to penetrate in a thickness direction of the cover plate 31. The pole 32 may be disposed through the first through hole 310 and connected to the cover plate 31, and the pole 32 may be electrically connected to the tab 21, at least a portion of the pole 32 connected to the cover plate 31 may be formed as a deformation portion, and the deformation portion may be configured to deform in response to a temperature change so as to press the cover plate 31, thereby enabling the cover plate 31 to be used for sealing the first end opening 11 under the pressing action of the deformation portion.
In this way, when the end cap assembly 30 is assembled to the case 10 of the battery 100, firstly, the cap plate 31 of a material capable of being deformed by the pressing action can be press-coupled in the case 10, and secondly, since the deformation portion can be deformed to press the cap plate 31 in response to the change in temperature, the cap plate 31 can be further deformed by the pressing action of the deformation portion, so that the cap plate 31 can be press-coupled tightly in the case 10, thereby achieving the sealing of the cap plate 31 to the opening of the case 10. Therefore, the end cap assembly 30 of the present application replaces the method of welding the metal cover plate 31 to the housing 10 to seal the opening of the housing 10 in the related art, thereby saving the welding process, effectively simplifying the assembly process of the battery 100, and being beneficial to improving the assembly efficiency of the battery 100 and reducing the assembly cost of the battery 100.
In some embodiments, the cover 31 may be made of a non-metal material, and the non-metal material should be configured to be capable of being deformed by the pressing action, so that the cover 31 may be connected to the housing 10 by pressing, and be capable of being deformed by the pressing action of the deformation portion. Meanwhile, the cover plate 31 is made of more materials, and the metal materials are not necessarily selected and welded, so that the material selection space is larger.
By way of example, the cover 31 may be a rubber cover 31, a silicone cover 31, or the like, for example. Since the rubber cover plate 31 and the silica gel cover plate 31 have certain deformation capability, high temperature resistance and sealing performance, when the cover plate 31 is mounted on the housing 10 of the battery 100, sealing between the cover plate 31 and the housing 10 can be realized by utilizing the material performance of the cover plate 31, and when the deformation part deforms and presses the cover plate 31 in response to temperature change, the cover plate 31 can deform under the pressing action, so that the sealing condition between the cover plate 31 and the housing 10 is further enhanced, and the sealing reliability of the cover plate 31 and the housing 10 is improved.
Alternatively, since the cover plate 31 is configured to employ a material capable of being deformed by the pressing action, when the cover plate 31 is mounted to the housing 10, the cover plate 31 may be interference-connected to the housing 10, that is, the peripheral surface of the cover plate 31 in its own circumferential direction may be interference-connected to the inner wall surface of the housing 10, so that when the deformation portion does not deform the cover plate 31 in response to a temperature change, the cover plate 31 can also be pressed by the inner wall surface of the housing 10 due to its own material characteristics, thereby achieving the primary sealing connection of the cover plate 31 with the housing 10.
In some embodiments, as can be seen from the foregoing description, when the battery 100 is a cylindrical battery 100, the cover 31 may be a circular cover 31, and the first through hole 310 may be disposed at a central position of the cover 31, i.e. the first through hole 310 is substantially matched with a central position of the housing 10. The penetrating direction of the first through hole 310 is a first direction X, and the direction in which the deformation portion deforms in response to a change in temperature is a second direction Y, which is not parallel to the first direction X. Specifically, the penetrating direction of the first through hole 310 is actually the direction of the first end opening 11 of the housing 10, and since the cover plate 31 is installed in the housing 10, the cover plate 31 can be pressed by the housing 10 in the direction along which its own inner wall faces the middle of the housing 10, so that the cover plate 31 is preliminarily sealed in the housing 10, and therefore, by providing the direction of deformation by the change of the deformation portion not parallel to the first direction X, the deformation direction of the deformation portion can be deformed in the direction at an angle to the first direction X (the second direction Y can be perpendicular to the first direction X), thereby facilitating the pressing of the cover plate 31 against the housing 10 in the direction at an angle to the first direction X, for example, the cover plate 31 can be pressed against the housing 10 in the direction along the middle of the housing 10 toward the inner wall of the housing 10, so that the cover plate 31 can be firmly sealed in the housing 10, avoiding the cover plate 31 from being detached from the opening direction of the first end opening 11 of the housing 10.
Further, the first through hole 310 may include a first portion 310a and a second portion 310b connected to the first portion 310a and forming a step surface 3101 with the first portion 310a, the pole 32 may include a cylindrical portion 32a and a head portion 32b, the cylindrical portion 32a may be disposed through the first portion 310a, the head portion 32b may be disposed on the cylindrical portion 32a and disposed through the second portion 310b in an interference manner, the head portion 32b may be carried on the step surface 3101, and the head portion 32b may be formed as the deformation portion. Specifically, the first portion 310a may be penetrated through the first portion 310a to reach the interior of the housing 10 and electrically connect with the tab 21 of the battery cell 20, while the head portion 32b is disposed at an end of the first portion 32a facing away from the tab 21, the head portion 32b is penetrated through the second portion 310b in an interference manner, and the head portion 32b is formed as the deformation portion, so that the head portion 32b is not separated from the first portion 32a, and the cover 31 can be directly pressed when the head portion 32b deforms in response to a temperature change, so that the cover 31 is sealed at the first end opening 11 of the housing 10.
Alternatively, the material of the pillar portion 32a may be different from the material of the head portion 32b, i.e., the material of the pillar portion 32a is different from the material of the deformation portion. For example, the post portion 32a may be made of a conductive material such as copper, aluminum, etc., and the deformation portion may be made of a material such as a memory alloy, a memory polymer, etc.
Thus, the whole pole 32 is not required to be set as the material of the deformation part, the pole 32 can be selected according to different conditions, for example, the material of the column part 32a of the pole 32 can be conductive material, the material of the deformation part can be conductive or nonconductive material, the material selection range is wider, and meanwhile, the cost of the material of the deformation part adopted by the whole pole 32 can be reduced.
Further, when the pillar portion 32a is used for electrically connecting with the tab 21 of the battery cell 20, the pillar portion 32a may be directly electrically connected to the tab 21 of the battery cell 20, or may be indirectly electrically connected to the tab 21 of the battery cell 20. For example, when the post portion 32a is indirectly electrically connected to the tab 21 of the battery cell 20, the battery 100 may further include a switching piece 40, such that the switching piece 40 is located in the case 10, the switching piece 40 may be located between the battery cell 20 and the cap plate 31, one end of the switching piece 40 may be used to electrically connect to the tab 21 of the battery cell 20, and the other end of the switching piece 40 may be electrically connected to the post portion 32a of the post 32 to electrically connect the post portion 32a to the tab 21 of the battery cell 20.
Alternatively, the head portion 32b may include a first surface 320 along the opening direction of the second portion 310b and a second surface 321 opposite to the first surface 320, the second surface 321 may be carried on the step surface 3101, and the first surface 320 may be flush with or protrude from the surface of the cover 31 where the opening of the second portion 310b is provided (i.e., the upper surface 311 of the cover 31).
When the first surface 320 protrudes from the surface of the cover plate 31 with the opening of the second portion 310b, the head portion 32b may be of an end cap structure, and the head portion 32b may be made of a memory alloy material, so that the first surface 320 protrudes from the upper surface 311 of the cover plate 31, and when the battery 100 is applied to the battery 100 module, the first surface 320 can be welded with the busbar conveniently, thereby reducing the welding difficulty.
While the head portion 32b may also be of an end cap configuration or a collar configuration when the first surface 320 is flush with the surface of the cover plate 31 where the opening of the second portion 310b is located. When the head portion 32b is of an end cap structure and made of a memory alloy material, the battery 100 can be welded to the bus bar through the head portion 32b when the battery 100 is applied to a battery 100 module. When the head portion 32b is a collar structure, the material may be a memory alloy or a memory polymer, and when the head portion 32b is a memory polymer, the post portion 32a of the pole 32 should protrude from the head portion 32b, so that the post portion 32a can be used for welding with a bus bar.
Optionally, the head portion 32b may be further adhered to the second portion 310b when the head portion 32b is connected to the second portion 310b in an interference manner, so as to improve the connection reliability between the head portion 32b and the second portion 310b, and avoid the situation that the head portion 32b may be separated from the second portion 310b when the head portion 32b deforms in response to a temperature change.
Further, the second portion 310b further has a sidewall surface connected to the step surface 3101, and the peripheral surface of the head portion 32b is interference-connected to the sidewall surface of the second portion 310b to be deformed in response to a change in temperature to press the cap plate 31. As is apparent from the foregoing, when the cover plate 31 is connected to the case 10, the cover plate 31 is pressed in the direction in which the inner wall of the case 10 faces the middle part of the case 10, and therefore, when the peripheral surface of the head portion 32b is interference-connected to the side wall surface of the second portion 310b, when the head portion deforms to press the cover plate 31 in response to a temperature change, the direction of the pressing action of the head portion 32b against the cover plate 31 is in the direction from the middle part of the case 10 toward the inner wall surface of the case 10, so that the cover plate 31 can be subjected to the pressing action in the circumferential direction of the head portion 32b (i.e., in the second direction Y described above), so that the cover plate 31 can further press the case 10 of the battery 100 in the circumferential direction, so that the cover plate 31 is more firmly connected in the case 10, improving the sealability of the cover plate 31 against the case 10.
In some embodiments, the cover plate 31 or the pole 32 is provided with a through liquid injection hole 312, and the liquid injection hole 312 is connected with a sealing nail 312a in a sealing manner. The liquid injection hole 312 is designed so that liquid can be injected into the battery 100 through the liquid injection hole 312 during liquid injection, thereby realizing the liquid injection function of the battery 100.
As shown in fig. 1 and 2, in an example, the cover plate 31 is provided with a liquid injection hole 312, the liquid injection hole 312 may be located at one side of the first through hole 310, and when the liquid is injected into the liquid injection hole 312, the sealing nail 312a is not sealed in the liquid injection hole 312, and after the liquid injection is completed, the sealing nail 312a is sealed and connected in the liquid injection hole 312. Alternatively, the sealing nail 312a may be made of, for example, a metal sealing nail 312a or a material that deforms in response to a temperature change, such as a memory alloy or a memory polymer. When the sealing nail 312a is made of a material that deforms in response to temperature changes, after the injection is completed, the sealing nail 312a can be heated, so that the sealing nail 312a deforms to further seal the injection hole 312, and the sealing performance of the sealing nail 312a to the injection hole 312 is improved.
As shown in fig. 4 and 5, in another example, the injection hole 312 is provided in the post 32. In particular, the injection hole 312 may be disposed at approximately the middle of the post 32. The injection hole 312 is integrated on the post 32, and compared with the mode of arranging the injection hole 312 on the cover plate 31, the injection hole 312 is easy to be blocked and scratched because the cover plate 31 is a non-metal cover plate 31 and the aperture of the injection hole 312 is smaller. The pole 32 is made of metal, and the liquid injection hole 312 is not easy to be blocked and scratched, so that the liquid injection hole 312 can be ensured to realize the liquid injection function.
Further, when the liquid injection hole 312 is disposed on the post 32, the sealing nail 312a may be made of a material that deforms in response to a temperature change, for example, a memory alloy or a memory polymer, so that when the sealing nail 312a deforms in response to a temperature change, the sealing nail 312a not only can improve the sealing performance of the liquid injection hole 312, but also can squeeze the post 32 and the cover plate 31 located at the periphery of the post 32, so as to further increase the squeezing effect on the cover plate 31, make the squeezing effect on the cover plate 31 larger, further make the cover plate 31 squeeze in the housing 10 more firmly, and improve the sealing performance of the cover plate 31 on the housing 10.
In some embodiments, as can be seen from the foregoing description, the cover 31 may be, for example, a rubber cover 31 or a silica gel cover 31, so that when the cover 31 is connected to the housing 10, it may be connected to the housing 10 in an interference manner. On this account, in order to further enhance the pressing action of the case 10 against the cap plate 31, the junction of the inner wall surface of the case 10 and the outer peripheral surface of the cap plate 31 may form the pressing portion 12, so that the pressing portion 12 may be used to press the outer peripheral surface of the cap plate 31. In this way, the housing 10 can press the cap plate 31 from the inner wall surface of the housing 10 toward the middle portion of the housing 10, while at the same time, since the pole 32 is generally located inside the outer peripheral surface of the cap plate 31, the deformation portion can press the cap plate 31 from the middle portion of the housing 10 toward the inner wall surface of the housing 10, thereby subjecting the cap plate 31 to the double pressing forces in two different directions, avoiding the case where the cap plate 31 is pressed by the housing 10 to possibly be separated from the housing 10, so that the cap plate 31 can be pressed more firmly in the housing 10.
Further, as is also known from the foregoing, the deformation portion deforms in response to a change in temperature, so that the cover plate 31 can be pressed in the direction from the middle portion of the housing 10 toward the inner wall surface of the housing 10, and therefore, in order to improve the sealing performance of the cover plate 31 in the housing 10, the force with which the deformation portion deforms in response to a change in temperature to press the cover plate 31 may be greater or slightly greater than the pressing force with which the cover plate 31 is pressed by the pressing portion 12, so that the pressing action of the deformation portion on the cover plate 31 may be made greater, so that the cover plate 31 can press the housing 10 in the reverse direction from the middle portion of the housing 10 toward the inner wall surface of the housing 10, so that the sealing of the cover plate 31 in the housing 10 is made more secure.
Alternatively, when the pressing portion 12 is formed between the cover plate 31 and the inner wall surface of the case 10, the inner wall surface of the case 10 may be made to protrude at least partially toward the middle of the case 10 to form the pressing portion 12, so that the area of the pressing portion 12 is smaller than the entire area of the inner wall surface of the case 10, which has a stronger pressing effect on the cover plate 31. In a practical arrangement, for ease of processing, it is possible to press or squeeze in a direction in which the outer wall of the housing 10 faces the inner wall surface of the housing 10, so that the housing 10 forms an inward recess at the outer wall surface, while at the same time forming a convex portion at the inner wall surface of the housing 10 to form the squeeze portion 12.
Alternatively, in the height direction of the housing 10, when the cap plate 31 is mounted in the housing 10, the pressing portion 12 may correspond to approximately the middle in the thickness direction of the cap plate 31, so that the pressing action of the pressing portion 12 against the cap plate 31 is more uniform.
In some embodiments, the housing 10 has a first end surface 13, the first end surface 13 is provided with a first end opening 11, and the first end surface 13 is provided with a limiting portion 13a extending toward the inside of the first end opening 11, and the limiting portion 13a can be used to abut against the upper surface 311 of the cover 31 to limit the cover 31 from being removed from the first end opening 11. Specifically, the first end face 13 may be an upper surface of the housing 10 in its own height direction, that is, the first end opening 11 is an upper surface opening of the housing 10. In this way, the limiting portion 13a is disposed on the first end face 13 of the housing 10, and the limiting portion 13a is used to limit the cover plate 31 along the height direction of the housing 10, so as to avoid the cover plate 31 from being separated from the first end opening 11, and thus the cover plate 31 can be more firmly sealed in the housing 10.
For example, the limiting portion 13a may be integrally formed with the housing 10, and the limiting portion 13a may be a bent portion bent from the first end face 13 of the housing 10 into the first end opening 11, so that the caliber of the first end opening 11 is reduced by using the limiting portion 13a, thereby achieving the purpose of limiting the cover plate 31 from being pulled out of the first end opening 11. Of course, it will be appreciated that, as other examples, the limiting portion 13a may be provided separately from the housing 10, for example, a collar-like structure may be added at the first end face 13 of the housing 10, so as to limit the removal of the cover plate 31 from the first end opening 11.
In some embodiments, referring to fig. 1 and 6, the case 10 may further have a second end opening opposite to the first end opening 11, and the battery 100 may further include a bottom cover 50, and the bottom cover 50 may be welded to the case 10 to seal the second end opening. Thus, when the battery 100 is assembled, since the case 10 has the first end opening 11 and the second end opening, the battery cell 20 can be conveniently mounted in the case 10 from the second end opening, and the bottom cover 50 is welded to the case 10 to seal the second end opening, and the cover plate 31 is sealed and connected to the first end opening 11 by pressing, thereby reducing at least one welding process for sealing the case 10 and simplifying the assembly process of the battery 100.
Further, as can be seen from the foregoing, the battery 100 is a cylindrical battery 100, and therefore, the tab 21 of the battery cell 20 may include a first tab and a second tab opposite to the first tab, the first tab may be disposed toward the first end opening 11, the second tab may be disposed toward the second end opening, and therefore, the post 32 may be electrically connected to the first tab, and the bottom cover 50 may be electrically connected to the second tab. Thus, the bottom cover 50 can be reused in structure without additionally arranging the pole 32 electrically connected with the second pole at the bottom cover 50, the welding procedure of the pole 32 and the second pole is omitted, the use of components of the battery 100 is reduced, the assembling procedure of the battery 100 is further simplified, and the assembling cost of the battery 100 is reduced.
Alternatively, one of the first tab and the second tab may be a positive tab, and the other one may be a negative tab. For example, the first tab may be a negative tab, such that the post 32 may be a negative tab, and the second tab may be a positive tab, such that when the bottom cover 50 is electrically connected to the second tab, the bottom cover 50 may serve as the positive post 32, thereby enabling the internal electrical connection of the battery 100.
In some embodiments, a pressure relief portion 51 is formed between the bottom cover 50 and the housing 10, and the pressure relief portion 51 is used for blasting when the air pressure in the housing 10 reaches a predetermined value, so as to realize pressure relief in the housing 10. In this way, the pressure relief portion 51 formed between the bottom cover 50 and the housing 10 can realize the pressure relief function of the battery 100, so as to prevent explosion caused by failure in timely pressure relief of the battery 100 due to accumulation of internal gas, and thus, the use safety of the battery 100 is improved. In addition, by forming the pressure relief portion 51 between the bottom cover 50 and the case 10, structural reuse can be also achieved without additionally providing a design of an explosion-proof valve on the bottom cover 50, further reducing the use of components of the battery 100, and further simplifying the assembly process of the battery 100.
Further, the pressure relief portion 51 may be configured as a material that deforms in response to a change in temperature, for example, may be a memory alloy material, the pressure relief portion 51 may be formed at a welding portion between the bottom cover 50 and the housing 10, or the pressure relief portion 51 may be directly formed on the bottom cover 50. In this way, since the temperature is generally increased when the gas in the battery 100 gathers, the pressure relief portion 51 is configured to deform in response to the change of the temperature, so that the pressure relief portion 51 is more sensitive to the temperature, and can relieve the pressure in time, thereby being beneficial to improving the use safety of the battery 100.
Alternatively, the bottom cover 50 may be made of a memory alloy material, so that when the pressure relief portion 51 is formed at the welding position of the bottom cover 50 and the housing 10, the thermal expansion coefficient of the memory alloy material is inconsistent with that of the housing 10, so that the pressure relief portion 51 can be broken in time, and normal performance of the pressure relief function is ensured.
Optionally, the thickness of the bottom cover 50 at the pressure release portion 51 is smaller than the thickness of the bottom cover 50 at other positions except for the pressure release portion 51, and by adopting a memory alloy material mode in combination with the bottom cover 50, the bottom cover 50 is easier to deform at the pressure release portion 51, so that when the internal gas of the battery 100 gathers to reach a predetermined value, the pressure release portion 51 is easier to break in time, and normal operation of the pressure release function is ensured.
For example, as shown in fig. 5, the relief portion 51 is shown in fig. 5 to be formed at the welding of the bottom cover 50 and the case 10, and as can be seen from fig. 5, the relief portion 51 is actually formed as an annular thinned area, that is, the thickness at the relief portion 51 is smaller than that at other positions of the cover plate 31.
In a second aspect, the present application also discloses a battery module, which may include a case and the battery 100 according to the first aspect. The case may be used to house a plurality of the batteries 100 as described in the first aspect above, and the plurality of batteries 100 may be arranged in sequence within the case. The battery module having the battery 100 can also achieve the advantages of simplifying the assembly process of the battery 100 and reducing the assembly cost of the battery 100 as described in the first aspect.
In a third aspect, the present application also discloses an electric device, where the electric device may include the battery 100 according to the first aspect, or the battery module according to the second aspect. In particular, the powered device may include, but is not limited to, a vehicle, an energy storage system, an electronic product (e.g., a cell phone, a notebook computer, a tablet computer, etc.).
In a fourth aspect, as shown in fig. 1 and fig. 7, the present application further discloses a sealing method for the battery 100 according to the first aspect, where the sealing method may include:
401. a housing is provided having a first end opening as described above.
402. The battery cell is accommodated in the housing.
403. An end cap assembly is provided, which may include a cap plate and a pole, the pole being inserted through a first through hole of the cap plate and connected to the cap plate, and at least a portion of the pole connected to the cap plate being formed as a deformation portion.
404. And electrically connecting the pole with the pole lug of the battery core.
When the electrode post 32 is electrically connected to the tab 21 of the battery cell 20, the cover 31 is not yet installed in the housing 10, so that the electrode post 32 and the tab 21 of the battery cell 20 can be welded conveniently to achieve electrical connection.
405. The cover plate is mounted to the housing such that the cover plate is at least partially disposed in the housing and covers the first end opening.
In this step, after the terminal 32 is electrically connected to the tab 21 of the battery cell 20 by welding, the cover 31 may be mounted in the housing 10, and since the cover 31 is made of a material capable of being deformed by extrusion, the cover 31 may be mounted in the housing 10 in an interference manner, so that the cover 31 may be primarily sealed in the housing 10 by extrusion of the housing 10.
406. And heating the deformation part to enable the deformation part to deform in response to temperature change so as to squeeze the cover plate, so that the cover plate is sealed at the first end opening.
The purpose of this step is to increase the pressing action on the cover plate 31 by the deformed portion, thereby further enhancing the sealing performance of the cover plate 31 in the case 10.
It should be noted that, as described above, the injection hole 312 may be provided in the cover plate 31 or the pole 32, and therefore, the step of heating the deformation portion should be performed after the injection of the liquid through the injection hole 312 is completed.
Accordingly, as can be seen from the foregoing, when the pressing portion 12 is formed by pressing or extruding from the outer wall of the housing 10 toward the inner wall of the housing 10, the step of heating the deformation portion may be performed before the pressing portion 12 is formed, or after the pressing portion 12 is formed, for example, the deformation portion may be heated first and then the housing 10 may be pressed to form the pressing portion 12, or the housing 10 may be pressed first to form the pressing portion 12 and then the deformation portion may be heated, which is not particularly limited in this embodiment.
Therefore, in the sealing method of the battery 100 according to the present application, after the cover plate 31 is mounted on the housing 10 such that the cover plate 31 is at least partially located in the housing 10, the deformation portion can be heated, so that the deformation portion deforms in response to a temperature change to press the cover plate 31, so that the cover plate 31 is sealed in the first end opening 11, and therefore, the method for assembling the battery 100 does not need to weld the cover plate 31 and the housing 10, thereby effectively simplifying the assembly process of the battery 100, and further being beneficial to improving the assembly efficiency of the battery 100 and reducing the assembly cost of the battery 100.
The end cover assembly, the battery sealing method, the battery module and the electric equipment disclosed by the embodiment of the application are described in detail, specific examples are applied to the description of the principle and the implementation mode of the application, and the description of the above embodiment is only used for helping to understand the end cover assembly, the battery and the battery sealing method, the battery module, the electric equipment and the core thought of the application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present application, the present disclosure should not be construed as limiting the present application in summary.
Claims (17)
1. An end cap assembly for use with a battery including a housing having a first end opening, the end cap assembly comprising:
the cover plate is a rubber cover plate and is used for being connected with the shell to cover the first end opening, the cover plate is made of a material capable of deforming under the extrusion action, a first through hole is formed in the cover plate, and the first through hole comprises a first part and a second part which is connected with the first part and forms a step surface with the first part; and
the pole comprises a column part and a head part, the column part is penetrated through the first part, the head part is arranged on the column part and penetrated through the second part in an interference way, the head part is borne on the step surface, the head part is formed into a deformation part, and the deformation part is configured to deform and squeeze the cover plate in response to the change of temperature so that the cover plate squeezes the shell in the circumferential direction to seal the opening at the first end of the shell;
the penetrating direction of the first through hole is a first direction, the deformation direction of the deformation part in response to the change of temperature is a second direction, and the second direction is not parallel to the first direction.
2. The end cap assembly of claim 1, wherein the second portion further has a sidewall surface connected to the step surface, the peripheral surface of the head portion being in interference connection with the sidewall surface of the second portion to deform in response to a change in temperature to compress the cover plate.
3. The end cap assembly of claim 1, wherein the cylindrical portion is of a material different from the material of the deformation portion.
4. The end cap assembly of claim 1, wherein the cover plate or the pole is provided with a through liquid injection hole, and the liquid injection hole is connected with a sealing nail in a sealing way.
5. The end cap assembly of claim 4, wherein the seal staple is configured to employ a material that deforms in response to a change in temperature.
6. A battery, the battery comprising:
a housing having a first end opening;
the battery cell is accommodated in the shell and provided with a tab; and
the end cap assembly of any one of claims 1 to 5, said post being electrically connected to said tab, said cover plate being at least partially located in and connected to said housing, and said cover plate being adapted to seal against said first end opening under compression of said deformation.
7. The battery of claim 6, wherein the cover plate is interference connected in the housing.
8. The battery according to claim 6, wherein a junction of the inner wall surface of the case and the outer peripheral surface of the cap plate forms a pressing portion for pressing the outer peripheral surface of the cap plate.
9. The battery according to claim 8, wherein an inner wall surface of the case is at least partially projected toward a middle portion of the case to form the pressing portion.
10. The battery of claim 6, wherein the housing has a first end face, the first end face is provided with the first end opening, the first end face is provided with a limiting portion extending towards the inside of the first end opening, and the limiting portion is used for abutting against the upper surface of the cover plate to limit the cover plate from falling out of the first end opening.
11. The battery of any of claims 6-10, wherein the housing further has a second end opening opposite the first end opening, the battery further comprising a bottom cover welded to the housing to seal the second end opening;
the electrode tab comprises a first electrode tab and a second electrode tab with polarity opposite to that of the first electrode tab, the first electrode tab faces the first end opening, the second electrode tab faces the second end opening, the electrode post is electrically connected with the first electrode tab, and the bottom cover is electrically connected with the second electrode tab.
12. The battery according to claim 11, wherein a pressure relief portion for blasting when the air pressure in the case reaches a predetermined value is formed between the bottom cover and the case, so as to achieve pressure relief inside the case.
13. The battery of claim 12, wherein the pressure relief portion is configured to deform in response to a change in temperature, the pressure relief portion being formed at a weld of the bottom cover and the case, or the pressure relief portion being formed at the bottom cover.
14. The battery of claim 13, wherein the bottom cover is a memory alloy material and/or a thickness of the bottom cover at the pressure relief portion is smaller than a thickness of the bottom cover at other locations than the pressure relief portion.
15. A battery module comprising a battery as claimed in any one of claims 6 to 14.
16. A powered device comprising a battery according to any one of claims 6-14 or a battery module according to claim 15.
17. A method of sealing a battery, the method comprising:
providing a housing having a first end opening;
Accommodating a battery cell in the housing;
the end cover assembly comprises a cover plate and a pole, wherein the cover plate is a rubber cover plate, the cover plate is used for being connected with the shell to cover the first end opening, the cover plate is made of a material capable of deforming under the extrusion action, a first through hole is formed in the cover plate, the first through hole comprises a first part and a second part which is connected with the first part and forms a step surface with the first part, the pole comprises a column part and a head part, the column part is penetrated into the first part, the head part is arranged in the column part and is penetrated into the second part in an interference manner, the head part is supported on the step surface, and the head part is formed into a deformation part;
the pole post is electrically connected with the pole lug of the electric core;
mounting the cover plate to the housing such that the cover plate is at least partially positioned in the housing and covers the first end opening;
heating the deformation part to enable the deformation part to deform in response to temperature change so as to press the cover plate, so that the cover plate presses the shell in the circumferential direction to seal the first end opening;
The through direction of the first through hole is a first direction, the deformation direction of the deformation part in response to the change of temperature is a second direction, and the second direction is not parallel to the first direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115863862B (en) * | 2022-11-30 | 2023-12-22 | 厦门海辰储能科技股份有限公司 | Battery module and battery cell end cover assembly |
| CN116526075B (en) * | 2023-07-03 | 2024-06-07 | 宁德时代新能源科技股份有限公司 | Mounting seat, end plate assembly, battery and electricity utilization device |
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| US4429854A (en) * | 1982-11-26 | 1984-02-07 | Smith International, Inc. | Dual squeeze seal gland |
| CN101176908A (en) * | 2006-11-06 | 2008-05-14 | 比亚迪股份有限公司 | Riveting method as well as method for coupling electrode pole and cover plate of lithium ion battery |
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| CN114759321A (en) * | 2022-05-24 | 2022-07-15 | 厦门海辰新能源科技有限公司 | Battery and sealing method |
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| CN115377577A (en) | 2022-11-22 |
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