CN219892345U - Cover plate assembly of battery cell and battery cell - Google Patents

Abstract

The utility model discloses a cover plate component of a battery monomer and the battery monomer, wherein the cover plate component comprises: the cover plate is provided with a pressure relief hole; the explosion-proof piece is arranged on the cover plate and covers the pressure relief hole; the limiting piece is connected with the cover plate and limits the explosion-proof piece, and is provided with an avoidance hole which is opposite to the pressure relief hole; the limiting piece is further provided with a puncture part extending towards the explosion-proof piece, and the puncture part is used for puncturing the explosion-proof piece to release pressure when the explosion-proof piece deforms towards the limiting piece. According to the cover plate assembly provided by the embodiment of the utility model, the working state of the explosion-proof piece can be more stable through the limiting piece, the timely pressure relief can be realized through the puncture part arranged on the limiting piece, the working stability and reliability of the cover plate assembly can be effectively improved through reasonably setting the thickness of the explosion-proof piece, and in addition, the processing technology is simple, so that the production and manufacturing cost of the cover plate assembly can be reduced.

Description

Cover plate assembly of battery cell and battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly of a battery monomer and the battery monomer.

Background

In some related technologies, an explosion-proof valve of a battery cell cover plate is easily affected by factors such as extrusion vibration, for example, in the process of assembling or carrying the battery cell cover plate, the structure of the explosion-proof valve is easily damaged, so that the explosion-proof valve is in working failure, and the working reliability of the battery cell cover plate is seriously insufficient. And the processing procedure of the explosion-proof valve is complex, for example, the explosion-proof valve is punched through a plurality of procedures, so that the production and manufacturing cost of the battery cell cover plate is greatly increased.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a cover plate assembly, which can realize a pressure relief effect, has strong operational reliability and stability, and is not complicated in processing technology, thereby being beneficial to reducing production and manufacturing costs.

Another object of the present utility model is to provide a battery cell having the above-mentioned cap assembly.

According to an embodiment of the utility model, a cover plate assembly of a battery cell comprises: the cover plate is provided with a pressure relief hole; the explosion-proof piece is arranged on the cover plate and covers the pressure relief hole; the limiting piece is connected with the cover plate and limits the explosion-proof piece, and the limiting piece is provided with an avoidance hole which is opposite to the pressure relief hole; the limiting piece is further provided with a puncturing part extending towards the explosion-proof piece, and the puncturing part is used for puncturing the explosion-proof piece to release pressure when the explosion-proof piece deforms towards the limiting piece.

According to the cover plate assembly provided by the embodiment of the utility model, the explosion-proof piece is arranged on the cover plate and covers the pressure relief hole, the limiting piece is connected with the cover plate and is provided with the avoidance hole opposite to the pressure relief hole, the limiting piece can limit the explosion-proof piece, the working state of the explosion-proof piece is more stable, meanwhile, the limiting piece is provided with the puncture part, the explosion-proof piece can be punctured when the explosion-proof piece deforms towards the limiting piece, so that pressure relief is realized, the safety performance of a battery monomer is improved, the thickness of the explosion-proof piece can be reasonably arranged, the explosion-proof piece can be punctured by the puncture part, meanwhile, the explosion-proof piece is prevented from being damaged in the assembling or carrying process, the working stability and the reliability of the cover plate assembly are further effectively improved, and in addition, the explosion-proof piece does not need to be subjected to complex processing technology, and the production and manufacturing cost of the cover plate assembly is reduced.

In addition, the cover plate assembly according to the above embodiment of the present utility model may further have the following additional technical features:

according to some embodiments of the utility model, the puncture is disposed proximate to a perimeter of the relief hole.

According to some embodiments of the utility model, the puncture is an annular puncture structure extending along a circumference of the relief hole; alternatively, the puncture part comprises one or more puncture structures which are arranged at intervals in the circumferential direction of the avoidance hole.

According to some embodiments of the utility model, the puncture part protrudes from a side of the limiting piece facing the explosion proof piece, and the height of the puncture part protruding from the limiting piece is larger than the thickness of the explosion proof piece.

According to some embodiments of the utility model, the piercing portion is disposed on a side of the limiting member facing the explosion-proof sheet and has a spike structure.

According to some embodiments of the utility model, the rupture disc has a thickness of 0.02mm to 0.2mm; the height of the puncture part protruding out of the limiting piece is 0.2mm-0.4mm; the thickness of the limiting piece is larger than 0.35mm.

According to some embodiments of the utility model, a sinking table is arranged on the wall of the pressure relief hole, the explosion-proof sheet and the limiting piece are supported on the sinking table, and the explosion-proof sheet is positioned between the bottom wall of the sinking table and the limiting piece.

According to some embodiments of the utility model, the rupture disc comprises: a first body; the inner peripheral edge of the second body is connected with the outer peripheral edge of the first body; the inner peripheral edge of the third body is connected with the outer peripheral edge of the second body, and the third body is clamped between the cover plate and the limiting piece; the second body and the first body define an avoidance concave part with an opening facing the limiting piece, and the puncture part stretches into the avoidance concave part so as to puncture the first body when the explosion-proof piece deforms towards the limiting piece.

According to some embodiments of the utility model, the cover assembly of the battery cell further comprises: an insulating plate having first and second through holes arranged at intervals; the pole is arranged on the first through hole; the cover plate covers the insulating plate and is further provided with a mounting hole, the mounting hole corresponds to the first through hole, the pole is in sealing fit with the mounting hole, and the pressure relief hole corresponds to the second through hole.

The battery cell according to the embodiment of the utility model comprises the cover plate assembly of the battery cell according to the embodiment of the utility model.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is an enlarged schematic view of the structure of FIG. 4 at circle B;

FIG. 6 is a schematic structural view of a cover plate according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a stop member according to an embodiment of the present utility model;

fig. 8 is a bottom view of fig. 7.

Reference numerals:

a cover plate assembly 100;

a cover plate 10; a pressure relief hole 11; a sinking platform 12; a mounting hole 13;

a bursting disc 20; a first body 21; a second body 22; the relief recess 211; a third body 23;

a stopper 30; a relief hole 31; a puncture portion 32;

an insulating plate 40; a first through hole 41; a second through hole 42;

a post 43; a seal ring 44; a connecting member 45; an insulator 46.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, "a first feature" may include one or more such features, and "a plurality" may mean two or more, and that a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween, with the first feature "above", "over" and "above" the second feature including both the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.

A cover plate assembly 100 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

Referring to fig. 1 to 8, a cap plate assembly 100 according to an embodiment of the present utility model includes: a cover plate 10 and a rupture disc 20.

Specifically, as shown in fig. 1 to 3 and 6, the cover plate 10 may have a pressure relief hole 11, the explosion-proof sheet 20 is provided to the cover plate 10, and the explosion-proof sheet 20 may cover the pressure relief hole 11. Specifically, when thermal runaway or the like occurs in the battery cell, high-temperature and high-pressure gas generated in the battery cell can be discharged through the pressure relief hole 11, so that the use safety of the battery cell is ensured. For example, the cover plate 10 may be a photo-aluminum plate.

In addition, the explosion-proof sheet 20 covers the pressure relief hole 11, for example, when thermal runaway occurs in the battery cell, the explosion-proof sheet 20 can open the pressure relief hole 11 to ensure the directional discharge of high-temperature and high-pressure gas; when the battery cell normally works, the stable working state of the battery cell can be ensured, for example, dirt and the like in the external environment can be effectively prevented from entering the battery cell from the pressure relief hole 11, and medium in the battery cell can be prevented from being leaked from the pressure relief hole 11, so that the tightness of the internal environment of the battery cell is ensured.

In some related art, explosion-proof valves of cell cover plates are susceptible to extrusion vibration and the like, for example, a main explosion-proof sheet design in the market is to weld a plate body made of an aluminum (Al 1060) material to the cell cover plate, and the explosion-proof sheet needs to be punched through a plurality of processes, for example, a score is formed by punching. When the internal pressure of the battery cell is too high, the explosion-proof piece is exploded from the weak notch.

However, during the assembly or the carrying process of the battery cell cover plate, the explosion-proof sheet is easy to damage, so that the explosion-proof sheet is invalid in operation, and the working reliability of the battery cell cover plate is seriously insufficient. And the processing procedure of the explosion-proof sheet is complex, the production cost is high, and the production and manufacturing cost of the battery cell cover plate is high.

In the embodiment of the present utility model, as shown in fig. 4 and 5, and fig. 7 and 8, the cover assembly 100 may further include a limiting member 30, where the limiting member 30 is connected to the cover 10, for example, the limiting member 30 is welded or adhesively connected to the cover 10. In addition, the limiting member 30 may limit the explosion-proof sheet 20, for example, the limiting member 30 may limit the explosion-proof sheet 20 along the height direction (up-down direction as shown in fig. 1) of the cover plate assembly 100, so that the working state of the explosion-proof sheet 20 is more stable.

Meanwhile, the limiting piece 30 can be provided with an avoidance hole 31 which is opposite to the pressure relief hole 11, so that the limiting piece 30 is prevented from obstructing the flow path of high-temperature high-pressure gas, and the pressure relief process can be ensured to be smoothly carried out. It should be noted that the shape of the avoiding hole 31 may be the same as the pressure relief hole 11 or may be different from the pressure relief hole, which are all within the protection scope of the embodiment of the present utility model.

The limiting piece 30 further has a puncturing portion 32 extending toward the explosion-proof piece 20, and the puncturing portion 32 can be used for puncturing the explosion-proof piece 20 when the explosion-proof piece 20 deforms toward the limiting piece 30, so as to release pressure and ensure the safety of the battery cell.

Specifically, under the conditions that the battery monomer is out of control, the high-temperature and high-pressure gas generated in the battery monomer can enable the explosion-proof sheet 20 to deform towards the limiting piece 30, for example, the explosion-proof sheet 20 is arched towards the limiting piece 30, the area, corresponding to the puncture part 32, in the explosion-proof sheet 20 can be contacted with the puncture part 32, the puncture part 32 can puncture the explosion-proof sheet 20, the structure of the explosion-proof sheet 20 is further damaged, the structural strength of the explosion-proof sheet 20 is effectively reduced, the explosion-proof sheet 20 can be easily broken by the high-temperature and high-pressure gas, the pressure relief hole 11 and the avoidance hole 31 are punched, and the deformation of the battery monomer caused by overlarge pressure in the battery monomer is avoided, so that the safety performance of the battery monomer is ensured.

It should be noted that, the piercing portion 32 may partially pierce the rupture disk 20 or completely pierce the rupture disk 20, which may realize the pressure relief of the rupture disk 20, and it is within the scope of the present utility model.

Compared with the prior art that the pressure relief is realized by reducing the structural strength of the explosion-proof film through the stamping process of the explosion-proof film, the pressure relief is realized by reducing the structural strength of the explosion-proof film through the puncture part 32, the pressure relief can be realized by puncturing the explosion-proof film 20 when the explosion-proof film 20 deforms towards the limiting piece 30.

The explosion-proof sheet 20 does not need to be subjected to a complex stamping process, the thickness of the explosion-proof sheet 20 can be set more flexibly, damage and the like in the assembling or carrying process due to the fact that the thickness of the explosion-proof sheet 20 is too small are avoided, and therefore the working stability of the explosion-proof sheet 20 is improved. And the limiting piece 30 can effectively limit the explosion-proof piece 20 to generate displacement, so that the working stability of the cover plate assembly 100 is greatly improved.

In addition, the puncture part 32 is arranged on the limiting piece 30 to realize pressure relief, so that the thickness of the explosion-proof piece 20 can be prevented from being changed through a complex stamping process, and the processing procedure of the explosion-proof piece 20 is reduced, thereby being beneficial to reducing the production and manufacturing cost of the explosion-proof piece 20 and reducing the difficulty of a workpiece of the explosion-proof piece 20.

According to the cover plate assembly 100 provided by the embodiment of the utility model, the explosion-proof piece 20 is arranged on the cover plate 10 and covers the pressure release hole 11, the limiting piece 30 is connected with the cover plate 10 and is provided with the avoidance hole 31 opposite to the pressure release hole 11, the limiting piece 30 can limit the explosion-proof piece 20, the working state of the explosion-proof piece 20 is more stable, meanwhile, the limiting piece 30 is provided with the puncture part 32, the explosion-proof piece 20 can be punctured when the explosion-proof piece 20 deforms towards the limiting piece 30, so that the pressure release is realized, the safety performance of a battery cell is improved, and the thickness of the explosion-proof piece 20 can be reasonably arranged, the puncture part 32 can puncture the explosion-proof piece 20, meanwhile, the explosion-proof piece 20 is prevented from being damaged in the assembly or carrying process, and further, the working stability and the reliability of the cover plate assembly 100 are effectively improved.

The specific structure, shape, arrangement position, processing technique, etc. of the piercing portion 32 can be flexibly set according to actual requirements. The puncture portion 32 may be formed by press molding, or may be formed by machine-addition molding.

In some embodiments of the present utility model, as shown in fig. 5, 7 and 8, the puncture 32 may be provided near the peripheral edge of the escape hole 31.

Specifically, on the one hand, the opening position of the avoidance hole 31 can provide an operation space for processing the puncture part 32, the setting position of the puncture part 32 is close to the periphery of the avoidance hole 31, so that the processing operation of the puncture part 32 can be realized more conveniently, and in some embodiments, the puncture part 32 and the periphery of the avoidance hole 31 can be integrally injection molded, thereby being beneficial to reducing the cost of a workpiece and the difficulty of the workpiece.

On the other hand, the position of the puncture part 32 can enable the puncture part 32 to be closer to the center line of the pressure relief hole 11, so that when the explosion-proof sheet 20 is arched by high-temperature and high-pressure gas, the puncture part 32 can be more quickly contacted with the explosion-proof sheet 20 to puncture the structure of the explosion-proof sheet 20, pressure relief is realized, the whole pressure relief process can be more timely, and the safety performance of the battery cell is higher.

In some embodiments of the present utility model, as shown in fig. 7, the puncture portion 32 may be an annular puncture structure extending in the circumferential direction of the escape hole 31, in other words, the puncture portion 32 is a continuous structure. Therefore, in any circumferential direction of the avoidance hole 31, the puncture part 32 can be in contact with the explosion-proof sheet 20 and puncture the explosion-proof sheet 20 to realize pressure relief, the puncture effect can be realized more comprehensively, and the pressure relief process of the cover plate assembly 100 is more reliable.

In some embodiments where the lancing portion 32 is configured as an annular lancing structure, the number of lancing portions 32 can be flexibly arranged, e.g., 1, 2, 3, etc., and the lancing portions 32 can be arranged in a plurality of turns.

In other embodiments of the present utility model, the lancing section 32 may include one or more lancing structures spaced apart in the circumferential direction of the relief hole 31. That is, the puncturing portion 32 has a discontinuous and intermittent structure.

Therefore, the arrangement position of the puncture part 32 can be more flexible, the pressure release effect can be realized, the processing difficulty of the puncture part 32 can be reduced, and the manufacturing cost of the limiting piece 30 can be reduced. Also, in some embodiments where the lancing structure includes a plurality of lancing structures, the plurality of lancing structures can be evenly spaced to achieve a better lancing effect.

Of course, in some embodiments where lancing portion 32 includes a plurality of lancing structures, the placement of the plurality of lancing structures may be irregular, and remain within the scope of the present utility model.

In some embodiments of the present utility model, as shown in fig. 4, 5 and 7, the piercing portion 32 protrudes from the side of the stopper 30 facing the rupture disk 20.

Specifically, one end of the puncture part 32 is a fixed end, and the other end of the puncture part 32 is closer to the rupture disc 20 than the side of the stopper 30 facing the rupture disc 20. And, the height of the piercing portion 32 protruding from the stopper 30 is greater than the thickness of the burst disk 20. Therefore, the puncture part 32 can be ensured to puncture the explosion-proof sheet 20, the effect of destroying the explosion-proof sheet 20 is better, the structural strength of the explosion-proof sheet 20 is lower, and high-temperature high-pressure gas can more smoothly puncture the explosion-proof sheet 20 to be discharged to the external environment, so that pressure relief is realized.

In some embodiments, the difference between the height of the protruding limiting member 30 of the piercing portion 32 and the thickness of the rupture disc 20 is 0.2mm, so that structural interference between the piercing portion 32 and other structures in the cover plate assembly 100 can be avoided while the rupture disc 20 can be pierced, which is beneficial to reducing the overall thickness of the cover plate assembly 100 and making the structural design of the cover plate assembly 100 more reasonable.

Of course, the piercing portion 32 may be disposed on the side surface of the limiting member 30 facing the explosion-proof sheet 20, or disposed on the wall of the avoidance hole 31, for example, the piercing portion 32 may be integrally formed with the wall of the avoidance hole 31, so that the piercing portion 32 can be processed more conveniently.

In some embodiments, as shown in fig. 4 and 5, the piercing portion 32 may be provided on a side of the stopper 30 facing the rupture disk 20, and the piercing portion 32 may be a spike structure.

Specifically, the cross-sectional area of the spike structure is gradually reduced from the limiting member 30 to the explosion-proof sheet 20 along the center line of the avoidance hole 31, the cross-section of the spike structure refers to a cross-section obtained by cutting the spike structure in a plane perpendicular to the center line of the avoidance hole 31, and the end part of the spike structure is sharp, so that the explosion-proof sheet 20 can be effectively punctured when the explosion-proof sheet 20 deforms towards the limiting member 30, high-temperature and high-pressure gas can be smoothly flushed out, and pressure relief is realized.

For example, the cross section of the spike structure taken in a plane parallel to the center line of the relief hole 31 may be triangular or trapezoidal, etc. When the cross section is trapezoidal, the small end of the trapezoid faces the explosion-proof sheet 20, and compared with a triangle, the small end of the trapezoid does not need to be processed into an acute angle, so that the processing difficulty is reduced, and the production and manufacturing cost is further reduced.

Of course, the puncture part 32 may be disposed on the wall of the avoidance hole 31, where the puncture part 32 extends toward the explosion-proof sheet 20 and protrudes from one side of the limiting member 30 toward the explosion-proof sheet 20, so that the puncture part 32 can puncture the explosion-proof sheet 20 to realize pressure relief.

In some embodiments, the thickness of the rupture disc 20 may be 0.02mm-0.2mm, such as 0.02mm, 0.06mm, 0.12mm, 0.16mm, 0.2mm, etc. of the rupture disc 20. By having the thickness of the rupture disk 20 within the above-described range, the rupture disk 20 can have a certain structural strength and is not easily broken during assembly or handling of the closure assembly 100. In addition, the thickness of the explosion-proof sheet 20 is not too thick, so that the difficulty of puncturing the explosion-proof sheet 20 by the puncturing part 32 is avoided, and the explosion-proof sheet 20 is favorably and rapidly punctured by high-temperature high-pressure gas under the action of the puncturing part 32.

In some embodiments, the height of the lancing portion 32 protruding from the stop 30 can be 0.2mm to 0.4mm, such as 0.2mm, 0.3mm, 0.4mm, etc. of the lancing portion 32 protruding from the stop 30. Thus, while ensuring penetration of the rupture disk 20, structural interference of the lancing portion 32 with other structures in the closure assembly 100 is avoided, which is advantageous for making the overall construction of the closure assembly 100 more compact.

In some embodiments, the thickness of the stop 30 may be greater than 0.35mm, for example, the thickness of the stop 30 may be 0.35mm, 0.4mm, 0.45mm, etc. Thereby increasing the structural strength of the stopper 30 and thus the structural rigidity of the cap plate assembly 100. In addition, the thickness of the limiting piece 30 is within the above range, so that the connection between the limiting piece 30 and the cover plate 10 is more convenient, for example, in some embodiments where the limiting piece 30 and the cover plate 10 are connected by welding, the limiting piece 30 can be prevented from being welded through during welding, and the connection state of the limiting piece 30 and the cover plate 10 is more stable and reliable.

In some embodiments of the present utility model, as shown in fig. 2 and 5, the wall of the pressure relief hole 11 may be provided with a countersink 12, in other words, the wall of the hole near the end of the pressure relief hole 11 is provided with a protrusion structure extending toward the center line of the pressure relief hole 11, the protrusion structure being an annular protrusion and configured as a countersink 12 with the wall of the pressure relief hole 11. The rupture disc 20 and the stop 30 may be supported on the sinking platform 12 with the rupture disc 20 positioned between the bottom wall of the sinking platform 12 and the stop 30.

Thus, the bottom wall of the sinking platform 12 can support and limit the explosion-proof sheet 20 and the limiting member 30, and the peripheral wall of the sinking platform 12 can limit the explosion-proof sheet 20 and the limiting member 30, for example, limit the explosion-proof sheet 20 and the limiting member 30 to displace away from the central line direction of the pressure relief hole 11.

Meanwhile, the explosion-proof piece 20 is located between the bottom wall of the sinking platform 12 and the limiting piece 30, the bottom wall of the sinking platform 12 can prevent the explosion-proof piece 20 from generating downward displacement along the central line direction of the pressure relief hole 11, the limiting piece 30 can prevent the explosion-proof piece 20 from generating upward displacement along the central line direction of the pressure relief hole 11, and the working state of the explosion-proof piece 20 can be more stable and reliable, so that explosion-proof failure is avoided.

According to some embodiments of the present utility model, as shown in fig. 3, 4 and 5, the rupture disc 20 may include a first body 21, a second body 22 and a third body 23.

Specifically, the inner peripheral edge of the second body 22 may be connected with the outer peripheral edge of the first body 21, the inner peripheral edge of the third body 23 is connected with the outer peripheral edge of the second body 22, and the third body 23 is sandwiched between the cover plate 10 and the stopper 30. For example, the third body 23 may be sandwiched between the cover plate 10 and the limiting member 30, so that the structural design of the cover plate assembly 100 is more compact.

It should be noted that, the "inner" and "outer" refer to distances between the three bodies with respect to the center line of the pressure relief hole 11, for example, the inner peripheral edge of the second body 22 is closer to the center line of the pressure relief hole 11 with respect to the outer peripheral edge of the second body 22, and the third body 23, the second body 22, and the first body 21 are sequentially sleeved from the outside to the inside.

The second body 22 extends obliquely along a direction approaching the third body 23 and the cover plate 10, and the second body 22 and the first body 21 define a recess 211 with an opening facing the limiting member 30.

In other words, the second body 22 and the first body 21 are configured to be similar to a groove structure, the second body 22 is a peripheral wall of the groove structure, and the first body 21 is a bottom wall of the groove structure. The piercing portion 32 may extend into the relief recess 211 to pierce the first body 21 when the rupture disk 20 is deformed toward the stopper 30, thereby releasing pressure.

Specifically, through setting up and dodging concave part 211, after assembling explosion-proof piece 20 and locating part 30, dodging concave part 211 can provide the space for puncture portion 32 outstanding locating part 30, avoid explosion-proof piece 20 puncture portion 32 puncture explosion-proof piece 20 when the deformation towards locating part 30 does not take place, avoid the structural strength of explosion-proof piece 20 to receive the influence before the thermal runaway takes place in the battery monomer, and then be favorable to guaranteeing the steady state of battery monomer at normal during operation.

In some embodiments, the distance between the spike and the peripheral edge of the second body 22 along the length of the cap assembly 100 is greater than 0.5mm, such as may be 0.5mm, 0.6mm, 0.7mm, etc. Therefore, structural interference caused by too small distance between the spike part and the periphery of the second body 22 to the assembly of the limiting piece 30, the explosion-proof piece 20 and the cover plate 10 is avoided, and the structural design of the cover plate assembly 100 is more reasonable.

According to some embodiments of the present utility model, as shown in fig. 1 and 2, the cap plate assembly 100 may further include an insulating plate 40 and a post 43.

Specifically, the insulating plate 40 may have first and second through holes 41 and 42 arranged at intervals, and the first and second through holes 41 and 42 are arranged along the length direction of the cap plate assembly 100. The post 43 may be provided to the first through hole 41. By providing the insulating plate 40, it is ensured that the current guiding is achieved only by the pole 43, and the safety of the battery cell output circuit is improved. For example, the insulating plate 40 may be made of plastic.

Wherein, the cover plate 10 may cover the insulating plate 40, and the cover plate 10 may further have a mounting hole 13, the mounting hole 13 corresponding to the first through hole 41 in position, the mounting hole 13 being arranged along the length direction of the cover plate assembly 100 as well as the pressure release hole 11. In addition, the pole 43 is in sealing fit with the mounting hole 13, for example, through a sealing ring 44, so as to ensure the stability of the operation of the battery unit, for example, to avoid external impurities entering the interior of the battery unit through the mounting hole 13, and to facilitate ensuring the directional pressure release of the cover plate assembly 100. In addition, the pressure release hole 11 corresponds to the second through hole 42, so that the insulating plate 40 is prevented from interfering with the gas flow path inside the battery cell, and the smoothness of the pressure release process is ensured.

In some embodiments, as shown in fig. 2 and 4, the post 43 passes through the mounting hole 13 and then is connected to the connection member 45, for example, the connection member 45 may be a rivet block. When the battery cell is electrically connected with the busbar, the connecting piece 45 can effectively enlarge the connection area with the busbar, which is beneficial to improving the overcurrent capacity of the battery cell.

In some embodiments where the pole 43 is connected with the connecting member 45, as shown in fig. 2 and 4, the cover assembly 100 may further include an insulating member 46, where the insulating member 46 is disposed between the cover 10 and the connecting member 45, so as to ensure current diversion from passing through the pole 43 and ensure safety of current output.

The battery cell according to the embodiment of the present utility model is described below.

The battery cell according to the embodiment of the present utility model includes the cap plate assembly 100 according to the embodiment of the present utility model. Because the cover plate assembly 100 according to the embodiment of the utility model has the beneficial technical effects, the battery monomer according to the embodiment of the utility model is provided with the explosion-proof piece 20 on the cover plate 10 and covers the pressure relief hole 11, the limiting piece 30 is connected with the cover plate 10 and is provided with the avoidance hole 31 opposite to the pressure relief hole 11, the limiting piece 30 can limit the explosion-proof piece 20, the working state of the explosion-proof piece 20 is more stable, meanwhile, the limiting piece 30 is provided with the puncture part 32, the explosion-proof piece 20 can be punctured when the explosion-proof piece 20 deforms towards the limiting piece 30, so that pressure relief is realized, the safety performance of the battery monomer is improved, and the puncture part 32 can puncture the explosion-proof piece 20 and avoid breakage of the explosion-proof piece 20 in the assembly or carrying process, so that the working stability and reliability of the cover plate assembly 100 are effectively improved.

Other constructions and operations of the cap plate assembly 100 and the battery cells according to the embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description herein, reference to the terms "embodiment," "specific embodiment," "example," and the like, 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A cover assembly for a battery cell, comprising:

the cover plate is provided with a pressure relief hole;

the explosion-proof piece is arranged on the cover plate and covers the pressure relief hole;

the limiting piece is connected with the cover plate and limits the explosion-proof piece, and the limiting piece is provided with an avoidance hole which is opposite to the pressure relief hole;

the limiting piece is further provided with a puncturing part extending towards the explosion-proof piece, and the puncturing part is used for puncturing the explosion-proof piece to release pressure when the explosion-proof piece deforms towards the limiting piece.

2. The battery cell cover assembly of claim 1, wherein the puncture is disposed proximate a perimeter of the relief aperture.

3. The battery cell cover assembly of claim 1, wherein the puncture is an annular puncture extending circumferentially of the relief aperture; alternatively, the puncture part comprises one or more puncture structures which are arranged at intervals in the circumferential direction of the avoidance hole.

4. The battery cell cover assembly of claim 1, wherein the puncture portion protrudes from a side of the limiting member facing the rupture disc, and the height of the puncture portion protruding from the limiting member is greater than the thickness of the rupture disc.

5. The battery cell cover assembly of claim 1, wherein the puncture portion is disposed on a side of the limiting member facing the rupture disc and is in a spike structure.

6. The cover assembly of a battery cell of claim 1, wherein the rupture disc has a thickness of 0.02mm to 0.2mm; the height of the puncture part protruding out of the limiting piece is 0.2mm-0.4mm; the thickness of the limiting piece is larger than 0.35mm.

7. The battery cell cover assembly of claim 1, wherein a countersink is provided on a wall of the pressure relief hole, the rupture disc and the stopper are supported by the countersink, and the rupture disc is located between a bottom wall of the countersink and the stopper.

8. The cover assembly of a battery cell of claim 1, wherein the rupture disc comprises:

a first body;

the inner peripheral edge of the second body is connected with the outer peripheral edge of the first body;

the inner peripheral edge of the third body is connected with the outer peripheral edge of the second body, and the third body is clamped between the cover plate and the limiting piece;

the second body and the first body define an avoidance concave part with an opening facing the limiting piece, and the puncture part stretches into the avoidance concave part so as to puncture the first body when the explosion-proof piece deforms towards the limiting piece.

9. The cover assembly of a battery cell of any one of claims 1-8, further comprising:

an insulating plate having first and second through holes arranged at intervals;

the pole is arranged on the first through hole;

the cover plate covers the insulating plate and is further provided with a mounting hole, the mounting hole corresponds to the first through hole, the pole is in sealing fit with the mounting hole, and the pressure relief hole corresponds to the second through hole.

10. A battery cell characterized by comprising a cover assembly of a battery cell according to any of claims 1-9.