Battery cell cover plate assembly, battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack, and the battery cell cover plate assembly comprises a cover plate which is provided with a plurality of first through holes arranged at intervals along the length direction; the plurality of sealing plates are correspondingly mounted on the plurality of first through holes respectively; a liquid injection hole is formed in one of the multiple sealing plates, and an anti-explosion valve is arranged on at least one of the multiple sealing plates. According to the utility model, the anti-explosion valve and the liquid injection hole are respectively arranged on different sealing plates; the positions of the anti-explosion valve and the liquid injection hole can be flexibly arranged, and the anti-explosion valve and the liquid injection hole cannot limit the welding area of the connecting sheet and the tab; when the battery core needs to have relatively high overcurrent capacity, the welding area of the connecting sheet and the tab can be increased, and then the size of the first through hole or the position of the first through hole in the cover plate can be adaptively changed, so that the welding area of the connecting sheet and the tab is conveniently increased, and the overcurrent capacity of the battery core is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell cover plate assembly, a cell and a battery pack. Background Art

[0002] With the increasing maturity of new energy battery technology, at present, new energy batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance of new energy batteries are increasing day by day.

[0003] In related technologies, a cell generally includes a cover plate and a housing, and an explosion-proof valve and a liquid injection hole are arranged on the cover plate or the housing. Since the positions of the explosion-proof valve and the liquid injection hole are fixed, the welding area between the connecting piece and the tab cannot be changed. If the welding area between the connecting piece and the tab is too small, the over-current capacity of the cell will be too small, resulting in a reduction in the safety performance of the cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a cell cover plate assembly, a cell and a battery pack to solve the problem of too small over-current capacity of the cell.

[0005] In a first aspect, the utility model provides a cell cover plate assembly, including:

[0006] A cover plate, provided with a plurality of first through holes arranged at intervals along the length direction;

[0007] A plurality of sealing plates, respectively installed on the plurality of first through holes;

[0008] A liquid injection hole is arranged on one of the plurality of sealing plates, and at least one of the plurality of sealing plates is provided with an explosion-proof valve.

[0009] Beneficial effects: By arranging a plurality of first through holes at intervals along the length direction on the cover plate, installing sealing plates corresponding to the first through holes, and then respectively arranging the explosion-proof valve and the liquid injection hole on different sealing plates; the positions of the explosion-proof valve and the liquid injection hole can be flexibly set, and the explosion-proof valve and the liquid injection hole will not limit the welding area between the connecting piece and the tab; when a cell with a large over-current capacity is required, the welding area between the connecting piece and the tab can be increased, and then the size of the first through hole or the position of the first through hole on the cover plate can be adaptively changed, so as to facilitate increasing the welding area between the connecting piece and the tab and effectively improve the over-current capacity of the cell. Arranging the explosion-proof valve and the liquid injection hole on the sealing plate can also optimize the space utilization inside the cell, make the cell structure more compact, and improve the internal space utilization rate of the cell. Secondly, it helps to improve the overall sealing performance of the cell, can effectively prevent electrolyte leakage, reduce the risk of cell short circuit, and thus ensure the safety performance and service life of the cell.

[0010] In an alternative embodiment, the first through-hole is a stepped hole with a larger upper part and a smaller lower part. The sealing plate matches the larger hole of the stepped hole, and the sealing plate is installed in the larger hole and abuts against the stepped surface of the stepped hole.

[0011] Beneficial effects: By setting the first through-hole as a stepped hole with a larger upper part and a smaller lower part, and installing the sealing plate in the larger hole of the stepped hole and abutting against the stepped surface of the stepped hole, the stepped surface can provide a stable support and positioning for the sealing plate, making the contact between the sealing plate and the first through-hole closer, effectively preventing the leakage of gas or liquid. The stepped hole can also limit the movement of the sealing plate and prevent it from being displaced due to vibration or other external forces during operation, thus ensuring the reliability of the seal. When installing the sealing plate on the cover plate, the stepped hole with a larger upper part and a smaller lower part can also more conveniently place the sealing plate accurately in place.

[0012] In an alternative embodiment, the cover plate is further provided with two second through-holes, which are respectively arranged at both ends along the length direction of the cover plate, and a plurality of the first through-holes are arranged between the two second through-holes.

[0013] Beneficial effects: By reasonably setting the positions of the second through-holes and the first through-holes, during the process of assembling each component on the cover plate, it can enable the operator to more clearly distinguish the uses of the through-holes at different positions, improve the assembly efficiency, and also enable the operator to quickly locate and handle problems related to specific through-holes during maintenance. It can also maintain the structural strength of the cover plate to the greatest extent while ensuring the functions of other components on the cover plate.

[0014] In an alternative embodiment, it further includes pole posts, and the pole posts include a positive pole post and a negative pole post, which are respectively arranged in the two second through-holes.

[0015] Beneficial effects: By arranging the positive pole post and the negative pole post in the second through-holes at both ends of the cover plate, the force on the cover plate can be more uniform, enhancing the stability of the overall structure; in an environment where vibration or impact is endured, it can reduce the damage of the cover plate caused by uneven force. By increasing the distance between the positive pole post and the negative pole post, the risk of short circuit between the positive and negative poles caused by accidental factors can also be reduced.

[0016] In an alternative embodiment, it further includes connecting pieces, and the connecting pieces include a positive connecting piece and a negative connecting piece; the positive connecting piece includes a first connecting portion and a second connecting portion, and the first connecting portion is fixedly connected to the positive pole post;

[0017] The negative connecting piece includes a third connecting portion and a fourth connecting portion, and the third connecting portion is fixedly connected to the negative pole post.

[0018] Beneficial effects: By differentiating the positive connection piece and the negative connection piece, and fixedly connecting the connection parts of the positive connection piece and the negative connection piece to the positive electrode post and the negative electrode post respectively, the resistance and energy loss during current transmission can be reduced, enabling the current to flow more efficiently between the battery cell and the external circuit. By designing and combining the connection parts on the connection piece, the connection piece can be adapted to various different current magnitudes, voltage requirements, and working environments.

[0019] In an alternative embodiment, it further includes an upper plastic ring and a sealing ring, which are arranged between the electrode post and the cover plate, and the electrode post abuts against the cover plate through the upper plastic ring and the sealing ring.

[0020] Beneficial effects: By arranging the upper plastic ring and the sealing ring between the electrode post and the cover plate, the tiny gaps between the electrode post and the cover plate can be filled, effectively preventing external dust, moisture, and other impurities from entering the interior of the battery cell, avoiding short circuits or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. During the operation of the battery cell, it may be subject to vibration or impact. The upper plastic ring and the sealing ring can also play a buffering role, reducing the direct collision and wear between the electrode post and the cover plate, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring has good insulation performance, which can prevent accidental conductive contact between the electrode post and the cover plate, thereby improving the electrical safety of the battery cell.

[0021] In an alternative embodiment, the liquid injection hole is arranged on the sealing plate near the positive electrode post, and the explosion-proof valve is arranged on the sealing plate near the negative electrode post.

[0022] Beneficial effects: By arranging the liquid injection hole near the positive electrode post, during the liquid injection process, the liquid can flow more smoothly to various areas inside the battery cell, improving the uniformity and efficiency of liquid injection. By arranging the explosion-proof valve near the negative electrode post, when the internal pressure of the battery cell is too high, the gas can be discharged in a timely and effective manner, reducing the risk of explosion. Moreover, if a dangerous situation requires activating the explosion-proof valve, the pressure release direction generated is relatively separated from the current transmission direction of the positive electrode post, reducing the direct impact on the positive electrode post and related circuits, thereby reducing the risk of circuit damage and fault expansion.

[0023] In a second aspect, the present utility model further provides a battery cell, including:

[0024] The battery cell cover plate assembly as described above;

[0025] A housing, which has a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover plate assembly seals the opening;

[0026] An electrode assembly, which is arranged in the receiving cavity and is electrically connected to the positive connection piece and the negative connection piece of the battery cell cover plate assembly.

[0027] Beneficial effects: Since the battery cell includes a battery cell cover assembly and has the same effects as the battery cell cover assembly, they will not be elaborated here.

[0028] In an optional embodiment, a plurality of tabs are provided on the electrode assembly, and the plurality of tabs are fixedly connected to the second connecting portion of the positive connection piece and the fourth connecting portion of the negative connection piece respectively.

[0029] Beneficial effects: By providing a plurality of tabs on the electrode assembly and fixedly connecting the plurality of tabs to the second connecting portion of the positive connection piece and the fourth connecting portion of the negative connection piece respectively, the current conduction path is increased and the resistance is reduced, thereby improving the efficiency of current transmission between the electrode assembly and the connection piece. By connecting a plurality of tabs to the connection piece, the potential distribution and chemical reaction during charge and discharge of the electrode assembly can be more effectively balanced, improving the overall performance and consistency of the battery cell. At the same time, the fixed connection of the plurality of tabs can withstand a larger current, thereby enhancing the instantaneous power output ability of the battery cell.

[0030] In a third aspect, the present invention further provides a battery pack, including: a plurality of battery cells as described above.

[0031] Beneficial effects: Since the battery pack includes battery cells and has the same effects as the battery cells, they will not be elaborated here. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 Is a perspective view of a battery cell cover assembly according to an embodiment of the present invention;

[0034] Figure 2 Is Figure 1 The top view of the battery cell cover assembly shown;

[0035] Figure 3 Is Figure 2 The cross-sectional view along the A-A direction in;

[0036] Figure 4 Is Figure 3 The partial enlarged schematic view of A in;

[0037] Figure 5 Is a perspective view of a battery cell according to an embodiment of the present invention;

[0038] Figure 6 is Figure 5 a top view of the shown battery cell;

[0039] Figure 7 is Figure 6 a cross-sectional view taken along the B-B direction in

[0040] Figure 8 is Figure 7 a partially enlarged schematic view of B in

[0041] Explanation of reference numerals:

[0042] 100, battery cell cover assembly; 101, cover plate; 102, upper plastic ring; 103, negative electrode post; 104, negative electrode connecting piece; 1041, third connecting portion; 1042, fourth connecting portion; 105, sealing ring; 106, sealing plate; 1061, explosion-proof valve; 1062, liquid injection hole; 107, insulating part; 108, lower plastic sheet; 109, positive electrode connecting piece; 1091, first connecting portion; 1092, second connecting portion; 110, positive electrode post; 120, first through hole; 130, second through hole; 121, stepped surface; 122, large hole; 200, housing; 300, electrode assembly. Specific embodiments

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Next, with reference to Figures 1 to 8 , the embodiments of the present invention will be described.

[0045] According to an embodiment of the present invention, on the one hand, as shown in Figures 1 to 5 , a battery cell cover assembly 100 is provided, including: a cover plate 101, which is provided with a plurality of first through holes 120 arranged at intervals along the length direction; a plurality of sealing plates 106, which are respectively installed on the plurality of first through holes 120; a liquid injection hole 1062 is provided on one of the plurality of sealing plates 106, and at least one of the plurality of sealing plates 106 is provided with an explosion-proof valve 1061.

[0046] In this embodiment, by providing a plurality of first through-holes 120 spaced apart along the length direction on the cover plate 101, a sealing plate 106 is correspondingly installed on the first through-holes 120, and then the explosion-proof valve 1061 and the liquid injection hole 1062 are respectively arranged on different sealing plates 106; the positions of the explosion-proof valve 1061 and the liquid injection hole 1062 can be flexibly set, and the explosion-proof valve 1061 and the liquid injection hole 1062 will not limit the welding area of the connecting piece and the tab; when it is necessary for the battery cell to have a large over-current capacity, the welding area of the connecting piece and the tab can be increased, and then the size of the first through-hole 120 or the position of the first through-hole 120 on the cover plate 101 can be adaptively changed, so as to facilitate increasing the welding area of the connecting piece and the tab and effectively improve the over-current capacity of the battery cell. Arranging the explosion-proof valve 1061 and the liquid injection hole 1062 on the sealing plate 106 can also optimize the space utilization inside the battery cell, make the battery cell structure more compact, and improve the internal space utilization rate of the battery cell. Secondly, it also helps to improve the overall sealing performance of the battery cell, can effectively prevent electrolyte leakage, reduce the risk of battery cell short circuit, and thus ensure the safety performance and service life of the battery cell.

[0047] In one embodiment, as Figure 4 shown, the first through-hole 120 is a stepped hole with a larger upper part and a smaller lower part, the sealing plate 106 matches the large hole 122 of the stepped hole, and the sealing plate 106 is installed in the large hole 122 and abuts against the step surface 121 of the stepped hole.

[0048] In this embodiment, the step surface 121 can provide a stable support and positioning for the sealing plate 106, making the contact between the sealing plate 106 and the first through-hole 120 closer, and effectively preventing the leakage of gas or liquid. After the sealing plate 106 is installed in the large hole 122, the movement of the sealing plate 106 can be effectively restricted, preventing it from being displaced due to vibration or other external forces during operation, so as to ensure the reliability of the seal. When installing the sealing plate 106 on the cover plate 101, the stepped hole with a larger upper part and a smaller lower part can also more conveniently place the sealing plate 106 accurately in place.

[0049] In other embodiments, the first through-hole 120 can be set to two, and the shape of the first through-hole 120 can be square, then the sealing plate 106 is a square sealing plate matching the square through-hole, an explosion-proof hole is provided at the center position of one of the square sealing plates, the explosion-proof valve 1061 is installed in the explosion-proof hole, and a liquid injection hole 1062 is provided at the center position of the other square sealing plate. The number and shape of the first through-holes 120 can be set according to actual usage requirements and are not specifically limited.

[0050] In one embodiment, the cover plate 101 is further provided with two second through-holes 130, which are respectively arranged at both ends along the length direction of the cover plate 101, and a plurality of first through-holes 120 are arranged between the two second through-holes 130.

[0051] In this embodiment, by reasonably setting the positions of the second through-hole 130 and the first through-hole 120, during the process of assembling each component on the cover plate 101, it can enable the operator to more clearly distinguish the uses of through-holes at different positions, improve the assembly efficiency, and also enable the operator to quickly locate and handle problems related to specific through-holes during maintenance. At the same time, while ensuring the functions of other components on the cover plate 101, the structural strength of the cover plate 101 is maintained to the greatest extent.

[0052] In one embodiment, it further includes pole posts. The pole posts include a positive pole post 110 and a negative pole post 103, which are respectively arranged in two second through-holes 130.

[0053] In this embodiment, by arranging the positive pole post 110 and the negative pole post 103 in the second through-holes 130 at both ends of the cover plate 101, the force on the cover plate 101 can be made more uniform, enhancing the stability of the overall structure; in an environment where vibration or impact is endured, damage to the cover plate 101 caused by uneven force can be reduced. By increasing the distance between the positive pole post 110 and the negative pole post 103, the risk of short circuit between the positive and negative poles caused by accidental factors can also be reduced.

[0054] In one embodiment, it further includes connecting pieces. The connecting pieces include a positive connecting piece 109 and a negative connecting piece 104; the positive connecting piece 109 includes a first connecting portion 1091 and a second connecting portion 1092, and the first connecting portion 1091 is fixedly connected to the positive pole post 110; the negative connecting piece 104 includes a third connecting portion 1041 and a fourth connecting portion 1042, and the third connecting portion 1041 is fixedly connected to the negative pole post 103.

[0055] In this embodiment, the connection method between the first connecting portion 1091 of the positive connecting piece 109 and the positive pole post 110 can be welding connection, specifically, ultrasonic welding or laser welding can be used; to improve the connection stability between the connecting piece and the pole post. Similarly, the third connecting portion 1041 of the negative connecting piece 104 can be fixedly connected to the negative pole post 103 by using ultrasonic welding or laser welding. By differentiating the positive connecting piece 109 and the negative connecting piece 104, and fixedly connecting the connecting parts of the positive connecting piece 109 and the negative connecting piece 104 to the positive pole post 110 and the negative pole post 103 respectively, the resistance and energy loss during the current transmission process can be reduced, enabling the current to flow more efficiently between the battery cell and the external circuit. Further, by designing and combining the connecting portions on the connecting piece, the connecting piece can be adapted to various different current magnitudes, voltage requirements, and working environments. For example, when large current and high voltage need to be endured, the welding area between the first connecting portion 1091 and the positive pole post 110 and the connection area between the third connecting portion 1041 and the negative pole post 103 can be increased to improve the over-current capacity of the battery cell.

[0056] In other embodiments, the positive connection piece 109 further includes a fifth connection portion. The first connection portion 1091 and the second connection portion 1092 are connected through the fifth connection portion, and the fifth connection portion enables the first connection portion 1091 and the second connection portion 1092 not to be on the same horizontal plane, so as to facilitate the connection of the first connection portion 1091 and the second connection portion 1092 to the positive electrode post 110 and the electrode tab respectively. Similarly, the negative connection piece 104 includes a sixth connection portion, enabling the third connection portion 1041 and the fourth connection portion 1042 to be connected through the sixth connection portion, and making the third connection portion 1041 and the fourth connection portion 1042 not on the same horizontal plane.

[0057] In other embodiments, strip-shaped holes are provided on the second connection portion 1092 of the positive connection piece 109 and the fourth connection portion 1042 of the negative connection piece 104, which can avoid affecting other structures on the connection piece during the welding of the electrode tab to the second connection portion 1092 and the fourth connection portion 1042 respectively.

[0058] In one of the embodiments, as Figures 5 to 8 shown, it further includes an upper plastic ring 102 and a sealing ring 105, which are arranged between the electrode post and the cover plate 101, and the electrode post is in abutment with the cover plate 101 through the upper plastic ring 102 and the sealing ring 105.

[0059] In this embodiment, by arranging the upper plastic ring 102 and the sealing ring 105 between the electrode post and the cover plate 101, the tiny gaps between the electrode post and the cover plate 101 can be filled, effectively preventing external dust, moisture and other impurities from entering the interior of the battery cell, avoiding short circuits or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. During the operation of the battery cell, it may be subject to vibration or impact. The upper plastic ring 102 and the sealing ring 105 can also play a buffering role, reducing the direct collision and wear between the electrode post and the cover plate 101, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring 102 has good insulation performance, which can prevent accidental conductive contact between the electrode post and the cover plate 101, thereby improving the electrical safety of the battery cell.

[0060] In one of the embodiments, it further includes a lower plastic sheet 108, which is arranged between the cover plate 101 and the connection piece; through holes are formed at the positions of the lower plastic sheet 108 corresponding to the first through hole 120 and the second through hole 130 on the cover plate 101, so as to facilitate the connection of the electrode post and the electrode tab to the connection piece through the through holes. The lower plastic sheet 108 has good insulation performance and can also prevent accidental conductive contact between the electrode post and the cover plate 101, further improving the electrical safety of the battery cell.

[0061] In one embodiment, an insulating member 107 is further included and disposed between the lower plastic sheet 108 and the sealing plate 106. The size of the insulating member 107 is smaller than that of the sealing plate 106. By providing the insulating member 107, conductive contact between the tab and the sealing plate 106 can be effectively prevented, thereby improving the electrical safety of the battery cell.

[0062] In one embodiment, the liquid injection hole 1062 is provided on the sealing plate 106 near the positive electrode terminal 110, and the explosion-proof valve 1061 is provided on the sealing plate 106 near the negative electrode terminal 103.

[0063] In this embodiment, by disposing the liquid injection hole 1062 near the positive electrode terminal 110, during the liquid injection process, the liquid can flow more smoothly to various regions inside the battery cell, improving the uniformity and efficiency of liquid injection. By disposing the explosion-proof valve 1061 near the negative electrode terminal 103, when the pressure inside the battery cell is too high, the gas can be discharged in a timely and effective manner, reducing the risk of explosion. Moreover, when it is necessary to activate the explosion-proof valve 1061 in case of a dangerous situation, the pressure release direction generated is relatively separated from the current transmission direction of the positive electrode terminal 110, reducing the direct impact on the positive electrode terminal 110 and related circuits, thereby reducing the risk of circuit damage and fault expansion. In other embodiments, the positions of the liquid injection hole 1062 and the explosion-proof valve 1061 on the sealing plate 106 are arbitrary and can be set according to actual needs without specific limitations.

[0064] In one embodiment, the upper plastic ring 102, the lower plastic sheet 108, the sealing ring 105, the positive electrode terminal 110, the negative electrode terminal 103, the connecting piece, and the sealing plate 106 can be assembled into an integral body and supplied in the form of a component, simplifying the assembly process of the battery cell.

[0065] According to an embodiment of the present invention, on the other hand, a battery cell is further provided, including: the battery cell cover assembly 100 as described above; a housing 200 having a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover assembly 100 seals the opening; and an electrode assembly 300 disposed in the receiving cavity and electrically connected to the positive connection piece 109 and the negative connection piece 104 of the battery cell cover assembly 100. Since the battery cell includes the battery cell cover assembly 100 and has the same effects as the battery cell cover assembly 100, it will not be described in detail herein.

[0066] In this embodiment, the battery cell includes, but is not limited to, a lithium-ion battery cell.

[0067] In one embodiment, a plurality of tabs are provided on the electrode assembly 300, and the plurality of tabs are respectively fixedly connected to the second connection portion 1092 of the positive connection piece 109 and the fourth connection portion 1042 of the negative connection piece 104.

[0068] In this embodiment, multiple tabs provided on the electrode assembly 300 are integrally formed with the electrode assembly 300. After being bent, the tabs are respectively fixedly connected to the second connection portion 1092 of the positive connection piece 109 and the fourth connection portion 1042 of the negative connection piece 104. Specifically, welding can also be used to electrically connect the tabs to the connection pieces, so as to enhance the connection stability between the tabs and the connection pieces. By respectively fixedly connecting the multiple tabs to the second connection portion 1092 of the positive connection piece 109 and the fourth connection portion 1042 of the negative connection piece 104, the current conduction path is increased and the resistance is reduced, thereby improving the efficiency of current transmission between the electrode assembly 300 and the connection pieces. Moreover, it can more effectively balance the potential distribution and chemical reactions during the charge and discharge process of the electrode assembly 300, improving the overall performance and consistency of the battery cell. At the same time, the fixed connection of multiple tabs can withstand a larger current, thereby enhancing the overcurrent capacity of the battery cell.

[0069] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including: multiple battery cells as described above. Multiple battery cells form a battery module, and multiple battery modules form a battery pack. The battery pack has the same effects as the battery cells and will not be elaborated herein.

[0070] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: The cover plate is provided with a plurality of first through holes arranged at intervals along the length direction; A plurality of sealing plates are respectively mounted on the plurality of the first through holes; A liquid injection hole is provided on one of the plurality of sealing plates, and an explosion-proof valve is provided on at least another one of the plurality of sealing plates.

2. The battery cover assembly according to claim 1, characterized in that: The first through hole is a stepped hole that is larger at the top and smaller at the bottom. The sealing plate matches the large hole of the stepped hole. The sealing plate is installed in the large hole and abuts against the step surface of the stepped hole.

3. The battery cover assembly according to claim 1, characterized in that: The cover plate is further provided with two second through holes, which are respectively arranged at two ends along the length direction of the cover plate, and a plurality of the first through holes are arranged between the two second through holes.

4. The battery cover assembly according to claim 3, characterized in that: It also includes poles, which include a positive pole and a negative pole, which are respectively arranged in the two second through holes.

5. The battery cover assembly according to claim 4, characterized in that: It also includes a connecting piece, the connecting piece includes a positive connecting piece and a negative connecting piece; the positive connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected to the positive electrode column; The negative electrode connecting piece includes a third connecting portion and a fourth connecting portion, and the third connecting portion is fixedly connected to the negative electrode column.

6. The battery cover assembly according to claim 4, characterized in that: It also includes an upper plastic ring and a sealing ring, which are arranged between the pole and the cover plate, and the pole is abutted against the cover plate through the upper plastic ring and the sealing ring.

7. The battery cover assembly according to claim 4, characterized in that: The injection hole is arranged on the sealing plate close to the positive pole, and the explosion-proof valve is arranged on the sealing plate close to the negative pole.

8. A battery cell, characterized in that: include: The battery cell cover assembly according to any one of claims 1 to 7; A shell, wherein the shell has a receiving cavity and an opening communicating with the receiving cavity, and the cell cover plate assembly covers the opening; The electrode assembly is disposed in the accommodating cavity and is electrically connected to the positive electrode connecting piece and the negative electrode connecting piece of the battery cell cover assembly.

9. The battery cell according to claim 8, characterized in that: The electrode assembly is provided with a plurality of tabs, and the plurality of tabs are respectively fixedly connected to the second connection portion of the positive electrode connecting sheet and the fourth connection portion of the negative electrode connecting sheet.

10. A battery pack, characterized in that: include: A plurality of battery cells as claimed in any one of claims 8 or 9.

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