CN115020884A - Cap assembly, battery module, battery pack and vehicle - Google Patents

Cap assembly, battery module, battery pack and vehicle Download PDF

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Publication number
CN115020884A
CN115020884A CN202210752773.XA CN202210752773A CN115020884A CN 115020884 A CN115020884 A CN 115020884A CN 202210752773 A CN202210752773 A CN 202210752773A CN 115020884 A CN115020884 A CN 115020884A
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CN
China
Prior art keywords
battery
cap assembly
cell
terminal
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210752773.XA
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Chinese (zh)
Inventor
吴迪
李开波
何巍
刘金成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hubei Eve Power Co Ltd
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Hubei Eve Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hubei Eve Power Co Ltd filed Critical Hubei Eve Power Co Ltd
Priority to CN202210752773.XA priority Critical patent/CN115020884A/en
Publication of CN115020884A publication Critical patent/CN115020884A/en
Priority to PCT/CN2022/127225 priority patent/WO2024000948A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • 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)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a cover cap assembly, a battery module, a battery pack and a vehicle, and relates to the technical field of batteries. The cap component is used for a battery, the battery comprises an electric core and a shell for containing the electric core, the cap component comprises a cover plate, a convergence plate and a terminal, the cover plate is arranged at the bottom end of the shell and connected with a second pole lug of the electric core, the convergence plate is attached to the top end of the electric core and connected with a first pole lug of the electric core, a pole column is arranged on the convergence plate, the terminal is arranged on the top end of the shell in a penetrating mode and passes through the pole column and the convergence plate which is electrically connected, and a gap exists between the top end of the convergence plate and the bottom end of the terminal. According to the invention, the clearance is formed between the bus bar disc and the terminal, so that friction and collision in the assembling and using processes are avoided, the working performance and the service life of the battery are ensured as much as possible, the number of parts required by the cap assembly is reduced as much as possible, and the manufacturing cost is saved.

Description

Cap assembly, battery module, battery pack and vehicle
Technical Field
The invention relates to the technical field of batteries, in particular to a cap assembly, a battery module, a battery pack and a vehicle.
Background
The battery is widely applied to life, and traditional battery mainly includes electric core, battery casing and block subassembly, is about to electric core and puts into the battery casing and bend the utmost point ear of electric core and put together the back and be connected with the block subassembly to realize the electricity of block subassembly and electric core and seal the battery casing. However, in the process of assembling the battery, considering that the number of parts of the cap assembly is large and the size of the battery is small, the parts of the cap assembly are often rubbed and collided with each other during assembly and use, so that the working performance of the battery is damaged and the service life of the battery is reduced.
Disclosure of Invention
A first object of the present invention is to provide a cap assembly, which can prevent friction and collision during assembly and use, ensure the working performance and service life of a battery as much as possible, reduce the number of parts required for the cap assembly as much as possible, save the manufacturing cost, and reduce the number of assembling and disassembling processes.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a cap assembly for a battery including a cell and a housing for housing the cell, the cap assembly comprising:
the cover plate is arranged at the bottom end of the shell and is connected with a second pole lug of the battery cell;
the current collecting disc is attached to the top end of the battery cell and connected with a first pole lug of the battery cell, and a pole is arranged on the current collecting disc (112);
the terminal, the terminal is worn to establish the top of casing and is passed through utmost point post with converge set electric connection, just converge the top of dish with there is the clearance between the bottom of terminal.
As an alternative to the cap assembly, the cap assembly further includes an energy absorbing structure connected to the terminal, the housing, and the bus bar, respectively, and configured to enable a gap to exist between a top end of the bus bar and a bottom end of the terminal.
As an alternative to the cap assembly, the energy absorbing structure includes a sealing ring and a plastic pad, the sealing ring is located the housing with between the terminals, the plastic pad is located the housing with converge between the discs, just the sealing ring is worn to locate the plastic pad.
As an alternative of the cap assembly, the edge of the plastic pad is close to the direction of the bus bar to extend to form an isolation portion, the plastic pad can be covered on the bus bar through the isolation portion, and the isolation portion can be attached to the inner wall of the shell.
As an alternative to the cap assembly, the cover plate is provided with a welding portion that protrudes in a direction close to the battery cell with respect to the cover plate, and an explosion-proof valve that protrudes in a direction away from the battery cell with respect to the cover plate.
As an alternative of the cap assembly, a liquid injection hole is formed in the cover plate, the liquid injection hole is coincided with the axis of the battery cell, and the cover plate protrudes towards the direction close to the battery cell to form a liquid injection boss along the edge of the liquid injection hole.
The second objective of the present invention is to provide a battery, which can avoid friction and collision during assembly and use, ensure the working performance and service life of the battery as much as possible, reduce the number of parts required for the cap assembly as much as possible, save the manufacturing cost, and reduce the assembly and disassembly processes by using the cap assembly.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a battery comprises a battery core, a shell and the cap assembly, wherein the shell is used for accommodating the battery core, and the cap assembly is respectively connected with the battery core and the shell.
A third object of the present invention is to provide a battery module, which can avoid friction and collision during assembly and use, ensure the working performance and service life of the battery as much as possible, reduce the number of parts required for the cap assembly as much as possible, save the manufacturing cost, and reduce the number of assembly and disassembly processes by using the above battery.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a battery module comprises a plurality of batteries as described above, and the plurality of batteries are arranged in a plurality of rows and a plurality of columns.
A fourth object of the present invention is to provide a battery pack, wherein the battery module can prevent friction and collision during assembly and use, ensure the working performance and the service life of the battery as much as possible, reduce the number of parts required for the cap assembly as much as possible, save the manufacturing cost, and reduce the number of assembly and disassembly processes.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a battery pack comprises a box body and a battery module, wherein the battery module is arranged in the box body.
A fifth object of the present invention is to provide a vehicle, wherein the battery pack can prevent friction and collision during assembly and use, ensure the working performance and the service life of the battery as much as possible, reduce the number of parts required for the cap assembly as much as possible, save the manufacturing cost, and reduce the number of assembly and disassembly processes.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a vehicle includes a vehicle body and the battery pack as described above, the battery pack being provided in the vehicle body.
The invention has the beneficial effects that: the invention provides a cap assembly, a battery module, a battery pack and a vehicle, wherein a clearance is formed between a bus bar and a terminal, so that friction and collision in the assembling and using processes are avoided, the working performance and the service life of the battery are ensured as far as possible, the number of parts required by the cap assembly can be reduced as far as possible, the manufacturing cost is saved, and the assembling and disassembling processes are reduced. The invention can avoid friction and collision in the assembling and using processes, ensure the working performance and the service life of the battery as much as possible, reduce the number of parts required by the cap assembly as much as possible, save the manufacturing cost and reduce the disassembling and assembling procedures.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a battery according to an embodiment of the present invention in an exploded state;
fig. 4 is a cross-sectional view of a battery provided in accordance with an embodiment of the present invention;
FIG. 5 is an enlarged partial schematic view of FIG. 4 at A;
FIG. 6 is a schematic view of a portion of the structure at B in FIG. 4;
fig. 7 is a bottom view of a battery according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line C-C of FIG. 7;
FIG. 9 is an enlarged partial schematic view of FIG. 8 at D;
fig. 10 is a bottom view of another battery provided in accordance with an embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view taken along line E-E of FIG. 10;
fig. 12 is a partially enlarged structural view at F in fig. 11.
Reference numerals:
1. a battery;
11. a cap assembly; 111. a cover plate; 1111. welding the part; 1112. an explosion-proof valve; 11121. explosion-proof nicking; 1113. a limiting part; 1114. a liquid injection hole; 112. a confluence disc; 113. a terminal; 114. an energy absorbing structure; 1141. a seal ring; 1142. a plastic pad; 11421. a first annular groove; 11422. a second annular groove; 11423. an isolation section;
12. a housing;
13. an electric core; 131. a first pole tab; 132. a second pole tab;
14. a solder part; 15. a bead portion.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
It is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning. Wherein the terms "first position" and "second position" are two different positions.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the present embodiment provides a vehicle, which includes a vehicle body and a battery pack, wherein the battery pack is disposed in the vehicle body, and the battery pack supplies power to the vehicle body to drive the vehicle body to move. The battery package includes box and battery module, and the battery module sets up in the box, plays the effect fixed and protection to the battery module through the box promptly. Specifically, in order to increase the maximum amount of electricity that can be stored in the entire battery module as much as possible, the battery module includes a plurality of batteries 1, and the plurality of batteries 1 are arranged in a plurality of rows and a plurality of columns. It is understood that the number and the specific arrangement of the batteries 1 can be adjusted according to actual situations, and the embodiment is not particularly limited.
Referring to fig. 2, fig. 3 and fig. 4, the battery includes a battery cell 13, a housing 12 and a cap assembly 11, the housing 12 is used for accommodating the battery cell 13, the cap assembly 11 is respectively connected to the battery cell 13 and the housing 12, the cap assembly 11 includes a cover plate 111, a current-collecting plate 112 and a terminal 113, the cover plate 111 is disposed at the bottom end of the housing 12 and is connected to a second pole tab 132 of the battery cell 13, the current-collecting plate 112 is attached to the top end of the battery cell 13 to be connected to a first pole tab 131 of the battery cell 13, a pole is disposed on the current-collecting plate 112, the terminal 113 is disposed at the top end of the housing 12 and electrically connected to the current-collecting plate 112 through the pole, and a gap exists between the top end of the current-collecting plate 112 and the bottom end of the terminal 113. It is understood that, in the present embodiment, the first pole tab 131 is a positive pole tab, and the second pole tab 132 is a negative pole tab.
It can be understood that the cap assembly 11 of the present embodiment avoids friction and collision during assembly and use by providing a gap between the bus bar 112 and the terminal 113, thereby ensuring the working performance and the service life of the battery 1 as much as possible, reducing the number of parts required for the cap assembly 11 as much as possible, saving the manufacturing cost, and reducing the number of mounting and dismounting processes. The cap assembly 11 can avoid friction and collision in the assembling and using processes, ensure the working performance and the service life of the battery 1 as much as possible, reduce the number of parts required by the cap assembly 11 as much as possible, save the manufacturing cost and reduce the assembling and disassembling processes.
In this embodiment, as shown in fig. 4 and 5, the cap assembly 11 further includes an energy absorbing structure 114, the energy absorbing structure 114 is connected to the terminal 113, the housing 12 and the bus bar 112, respectively, and the energy absorbing structure 114 is configured to enable a gap to exist between a top end of the bus bar 112 and a bottom end of the terminal 113. In addition, the energy absorption structure 114 can also play a certain role in shock absorption and buffering among the terminal 113, the shell 12 and the bus bar 112, so that the shock resistance and impact resistance of the battery 1 are enhanced, and the service life of the whole battery 1 is prolonged.
Specifically, energy absorbing structure 114 includes a sealing ring 1141 and a plastic pad 1142, sealing ring 1141 is located between housing 12 and terminal 113, plastic pad 1142 is located between housing 12 and manifold 112, and sealing ring 1141 penetrates plastic pad 1142. It will be appreciated that the provision of the sealing ring 1141 also enables sealing between the terminal 113 and the housing 12, thereby ensuring the safety of the use of the cap assembly 11. And a gap exists between the top end of the confluence plate 112 and the bottom end of the terminal 113 by the cooperation of the sealing ring 1141 and the plastic pad 1142. For example, the material of the sealing ring 1141 may be rubber resistant to electrolyte or elastic plastic.
In this embodiment, the surface of the plastic pad 1142 is concave-convex to absorb the stress generated by the plastic pad 1142 during swelling, so as to reduce the pressure of the stress on the battery cell 13 and the casing 12, and further absorb the pressure generated by the expansion of the battery cell 13 due to charging.
Specifically, a plurality of first annular grooves 11421 are disposed on the top surface of the plastic pad 1142, and the plurality of first annular grooves 11421 are radially and equidistantly distributed to improve the shock absorption and buffering effect of the whole energy absorption structure 114. Similarly, the bottom surface of the plastic pad 1142 is provided with a plurality of second annular grooves 11422, and the plurality of second annular grooves 11422 are radially and equidistantly distributed. It can be understood that the plastic pad 1142 swells in the electrolyte of the battery 1, and the stress generated by the plastic pad 1142 during swelling can be absorbed by the first annular groove 11421 and the second annular groove 11422, so as to reduce the stress on the battery cell 13 and the casing 12, and in addition, when the battery cell 13 expands due to charging, the stress generated by the battery cell 13 during swelling can be absorbed by the first annular groove 11421 and the second annular groove 11422.
Further, the first annular groove 11421 and the second annular groove 11422 are distributed in a staggered manner, so that the surface of the plastic pad 1142 is uneven, and the damping and buffering effect of the whole plastic pad 1142 is further enhanced.
In this embodiment, the edge of plastic pad 1142 extends along being close to the tray 112 direction of converging and forms isolation portion 11423, and plastic pad 1142 can cover through isolation portion 11423 and establish on the tray 112 of converging, and one side that isolation portion 11423 kept away from the tray 112 of converging is laminated with the inner wall of casing 12, separates the side week wall of tray 112 of converging and the inner wall of casing 12 through isolation portion 11423 promptly to avoid tray 112 of converging and casing 12 direct contact, improve whole battery 1's compressive property. Illustratively, the combiner plate 112 is made of aluminum.
Further, in order to avoid stress concentration when the isolation portion 111423 abuts against the housing 12, a chamfer is provided on an end surface of the isolation portion 11423 away from the battery cell 13, that is, the chamfer is used to disperse stress so as to prolong the service life of the plastic pad 11423. Optionally, the angle of the chamfer is less than or equal to 60 °.
Specifically, in order to realize that the plastic pad 1142 can be covered on the confluence disc 112 through the isolation portion 11423, the isolation portion 11423 and the plastic pad 1142 form an accommodating groove for accommodating the confluence disc 112, a side wall of the accommodating groove is attached to at least a part of a side wall of the confluence disc 112, and a bottom of at least a part of the accommodating groove is attached to a top surface of the confluence disc 112. Preferably, in order to improve the guard action to converging dish 112, the degree of depth of storage tank and the thickness looks adaptation of converging dish 112, the diameter of storage tank and the diameter looks adaptation of converging dish 112 to can avoid converging dish 112 to remove in the storage tank, cause unnecessary wearing and tearing except that other surface homoenergetic with electric core 13 contact can laminate with the storage tank to converging dish 112.
As shown in fig. 6 to 12, a welding portion 1111 and an explosion-proof valve 1112 are provided on the cover plate 111, the welding portion 1111 protrudes in a direction close to the battery cell 13 relative to the cover plate 111, and the explosion-proof valve 1112 protrudes in a direction away from the battery cell 13 relative to the cover plate 111, that is, the welding portion 1111 is welded to the second pole tab 132 of the battery cell 13, and the explosion-proof valve 1112 performs an explosion-proof function on the battery cell 13. In addition, since the welding portion 1111 protrudes in a direction close to the battery cell 13 with respect to the cover plate 111, and the explosion-proof valve 1112 protrudes in a direction away from the battery cell 13 with respect to the cover plate 111, that is, the top surface of the cover plate 111 has a distance h1 from the bottom surface of the second pole tab 132, and the bottom surface of the explosion-proof valve 1112 has a distance h2 from the bottom surface of the second pole tab 132, it can be known that h2 > h1 > 0, so that the acting force generated when the battery cell 13 expands can be absorbed through h1, and the height difference between h2 and h1 can be used for collecting the explosion gas, thereby preventing spontaneous combustion and explosion of the battery 1 due to excessive internal pressure while ensuring the stable connection of the cover plate 111 and the second pole tab 132, and improving the safety of the battery 1.
Alternatively, the maximum width of the explosion proof valve 1112 is less than one-half of the radius of the housing 12 to minimize the exhaust space required for the entire battery module.
Further, the explosion-proof valve 1112 is provided with an explosion-proof notch 11121, and the explosion-proof notch 11121 is formed by punching, so that when the internal pressure of the battery 1 is too large, the gas in the housing 12 can be released along the explosion-proof notch 11121, and the damage to the periphery of the battery 1 caused by the gas release is reduced.
Further, a plurality of welding parts 1111 are provided, and the plurality of welding parts 1111 are annularly provided on the cover plate 111 to ensure stability of connection with the second pole tab 132. Exemplarily, the welding portions 1111 are provided in three.
Optionally, the welding portion 1111 is arc-shaped, and a maximum major arc length of the welding portion 1111 is greater than a half of a radius of the battery cell 13, so as to ensure that a contact area between the battery cell 13 and the cover plate 111 is maximized as much as possible, and improve stability of electrical connection between the battery cell 13 and the cover plate 111. Of course, in other embodiments, the welding portion 1111 may have other shapes as long as the welding portion 1111 and the second electrode tab 132 can be stably welded, and the embodiment is not particularly limited.
Optionally, a plurality of explosion-proof valves 1112 are provided, and the plurality of explosion-proof valves 1112 are respectively arranged around the cover plate 111 to improve explosion-proof performance. Illustratively, the explosion-proof valve 1112 is provided with three.
Further, the welding portion 1111 and the explosion-proof valve 1112 are distributed in a staggered manner, so as to ensure the stress balance of the whole cover plate 111, thereby improving the gas circulation inside the housing 12.
In other embodiments, as shown in fig. 10, the cover 111 is further provided with a liquid injection hole 1114 for injecting or exhausting liquid.
Further, the liquid injection hole 1114 coincides with the axis of the battery cell 13, that is, the liquid injection hole 1114 is disposed at the center of the cover plate 111, so as to ensure the stress balance of the whole cover plate 111.
Optionally, the cover plate 111 protrudes from the edge of the liquid injection hole 1114 to a direction close to the battery cell 13 to form a liquid injection boss, so as to further increase the structural strength of the middle part of the cover plate 111.
In this embodiment, as shown in fig. 7 to fig. 9, the outer peripheral edge of the cover plate 111 is further provided with a limiting portion 1113, the limiting portion 1113 protrudes toward the direction close to the electric core 13 relative to the cover plate 111 to surround the second electrode tab 132, i.e., the second electrode tab 132 is positioned by the limiting portion 1113, which not only enhances the strength of the whole cover plate 111, but also facilitates the welding of the subsequent second electrode tab 132 and the welding portion 1111 to be accurate, so as to avoid the stress deviation of the second electrode tab 132 in the welding process from causing the second electrode tab to approach the inner wall of the casing 12, thereby causing poor welding and leading to poor use performance of the electric core 13. In addition, since the limiting portion 1113 can surround the second electrode tab 132, the second electrode tab 132 can be prevented from being damaged when the battery cell 13 is assembled.
Further, the surface of the limiting portion 1113 contacting the second pole tab 132 is disposed obliquely, that is, the cross section of the limiting portion 113 gradually decreases from the second pole tab 132 to the first pole tab 131, so as to further improve the constraint capability of the second pole tab 132 and avoid the second pole tab 132 from deviating as much as possible.
Considering that after the battery cell 13 is placed into the housing 12 through the opening at the bottom end of the housing 12, it is necessary to cover and fix the battery cell at the opening through the cover plate 111, that is, the peripheral edge of the cover plate 111 and the bottom end of the housing 12 are welded together by solder, and then the solder part 14 is formed at the joint of the housing 12 and the cover plate 111, so as to realize stable connection of the cover plate 111 and the housing 12.
Of course, as shown in fig. 10 to 12, in other embodiments, a first chamfer may be provided on the housing 12 along the edge of the opening, and a corresponding second chamfer may be provided on the cover plate 111, so that when the cover plate 111 and the housing 12 are welded by welding, a bead 15 can be formed at the joint of the housing 12 and the cover plate 111, which not only facilitates welding and reduces stress concentration, but also further improves the stability of the connection between the cover plate 111 and the housing 12.
Reference throughout this specification to "some embodiments," "other embodiments," or similar language means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (10)

1. A cap assembly for a battery comprising a cell (13) and a casing (12) for housing the cell (13), characterized by comprising:
the cover plate (111) is arranged at the bottom end of the shell (12) and is connected with a second pole lug (132) of the battery cell (13);
the bus bar disc (112) is attached to the top end of the battery cell (13) to be connected with a first pole lug (131) of the battery cell (13), and a pole is arranged on the bus bar disc (112);
the terminal (113) is arranged at the top end of the shell (12) in a penetrating mode and is electrically connected with the bus bar disc (112) through the pole, and a gap exists between the top end of the bus bar disc (112) and the bottom end of the terminal (113).
2. The cap assembly of claim 1, further comprising an energy absorbing structure (114), the energy absorbing structure (114) being connected to the terminal (113), the housing (12), and the bus bar (112), respectively, and the energy absorbing structure (114) being configured to enable a gap between a top end of the bus bar (112) and a bottom end of the terminal (113).
3. The cap assembly of claim 2, wherein the energy absorbing structure (114) includes a sealing ring (1141) and a plastic gasket (1142), the sealing ring (1141) is located between the housing (12) and the terminal (113), the plastic gasket (1142) is located between the housing (12) and the bus disc (112), and the sealing ring (1141) is disposed through the plastic gasket (1142).
4. The cap assembly of claim 3, wherein an edge of the plastic pad (1142) extends in a direction adjacent to the manifold (112) to form a partition (11423), the plastic pad (1142) is coverable on the manifold (112) by the partition (11423), and the partition (11423) is engageable with an inner wall of the housing (12).
5. The cap assembly according to any one of claims 1 to 4, characterized in that a weld (1111) and an explosion-proof valve (1112) are provided on the cap plate (111), the weld (1111) projecting with respect to the cap plate (111) in a direction close to the electric cell (13), and the explosion-proof valve (1112) projecting with respect to the cap plate (111) in a direction away from the electric cell (13).
6. The cap assembly according to any one of claims 1 to 4, characterized in that a liquid injection hole (1114) is formed in the cover plate (111), the liquid injection hole (1114) is coincident with the axis of the battery cell (13), and the cover plate (111) protrudes along the edge of the liquid injection hole (1114) in the direction close to the battery cell (13) to form a liquid injection boss.
7. A battery, characterized in that it comprises a cell (13), a casing (12) and a cap assembly according to any one of claims 1 to 6, the casing (12) being intended to house the cell (13), the cap assembly being connected to the cell (13) and to the casing (12), respectively.
8. A battery module comprising a plurality of the batteries according to claim 7, wherein the plurality of the batteries are arranged in a plurality of rows and a plurality of columns.
9. A battery pack, comprising a case and the battery module according to claim 8, wherein the battery module is disposed in the case.
10. A vehicle characterized by comprising a vehicle body and the battery pack according to claim 9, the battery pack being provided in the vehicle body.
CN202210752773.XA 2022-06-28 2022-06-28 Cap assembly, battery module, battery pack and vehicle Pending CN115020884A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210752773.XA CN115020884A (en) 2022-06-28 2022-06-28 Cap assembly, battery module, battery pack and vehicle
PCT/CN2022/127225 WO2024000948A1 (en) 2022-06-28 2022-10-25 Cap assembly, battery, battery module, battery pack, and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210752773.XA CN115020884A (en) 2022-06-28 2022-06-28 Cap assembly, battery module, battery pack and vehicle

Publications (1)

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CN115020884A true CN115020884A (en) 2022-09-06

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CN202210752773.XA Pending CN115020884A (en) 2022-06-28 2022-06-28 Cap assembly, battery module, battery pack and vehicle

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024000933A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 Cap assembly, battery, battery module, battery pack, and vehicle
WO2024000948A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 Cap assembly, battery, battery module, battery pack, and vehicle
WO2024000945A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 End cover assembly, battery, battery module, battery pack and vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024000933A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 Cap assembly, battery, battery module, battery pack, and vehicle
WO2024000948A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 Cap assembly, battery, battery module, battery pack, and vehicle
WO2024000945A1 (en) * 2022-06-28 2024-01-04 湖北亿纬动力有限公司 End cover assembly, battery, battery module, battery pack and vehicle

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