Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack, which comprise a cover plate assembly, an insulating part and a pole group, the insulating part is arranged between the cover plate assembly and the pole group; the orthographic projection of the insulating part on the pole group is located in the end surface range of the top of the pole group; the distance L between the edge of the insulating part and the edge of the pole group is 0.3 mm-0. 5mm. According to the utility model, the insulating part is arranged between the cover plate assembly and the pole group, so that the internal short circuit of the battery cell caused by damage of a diaphragm of the pole group is prevented, and the safety performance of the battery cell is effectively improved; the orthographic projection range of the insulating part on the pole group is smaller than that of the end surface of the top of the pole group, so that the occupation of the insulating part on the internal space of the battery cell can be reduced to the greatest extent, and the utilization rate of the internal space of the battery cell is improved. By reasonably setting the distance between the edge of the insulating part and the edge of the pole group, a key area needing to be insulated can be effectively covered, the risk of short circuit is prevented, and material waste and unnecessary weight increase caused by excessive covering are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric core 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 and safety performance of new energy batteries are increasing day by day.

[0003] In related technologies, due to the compact internal structure of the electric core, the internal separator of the electric core may be damaged due to the deformation of the connecting piece, resulting in an internal short circuit of the electric core, which greatly reduces the safety performance of the electric core. Summary of the Utility Model

[0004] In view of this, the utility model provides an electric core and a battery pack to solve the problem of low safety performance of the electric core.

[0005] In a first aspect, the utility model provides an electric core, comprising:

[0006] a cover plate assembly, an insulating member and a pole group;

[0007] The insulating member is arranged between the cover plate assembly and the pole group, and the orthographic projection of the insulating member on the pole group is located within the end face range of the top of the pole group;

[0008] The distance L between the edge of the insulating member and the edge of the pole group is 0.3 mm - 0.5 mm.

[0009] Beneficial effects: When the internal structure of the electric core is relatively compact, by arranging the insulating member between the cover plate assembly and the pole group, the separator of the pole group can be protected by the insulating member to prevent the separator from being damaged and causing an internal short circuit of the electric core, effectively improving the safety performance of the electric core. The orthographic projection of the insulating member on the pole group is located within the end face range of the top of the pole group, which can minimize the occupation of the internal space of the electric core by the insulating member, provide more layout space for other components, and help improve the space utilization rate inside the electric core. By reasonably setting the distance between the edge of the insulating member and the edge of the pole group, it can not only effectively cover the key areas that need insulation to prevent short-circuit risks, but also avoid excessive coverage causing material waste and unnecessary weight increase.

[0010] In an optional embodiment, a plurality of pole tabs are provided on the pole group, and the plurality of pole tabs are integrally formed with the pole group; insulating through holes matching the plurality of pole tabs are provided on the insulating member, and the pole tabs are arranged in the insulating through holes.

[0011] Beneficial effects: Integrating multiple tabs with the electrode group reduces the process of installing tabs separately, simplifies the production process, and thus improves the production efficiency of the battery cell. At the same time, it also avoids poor connection between the tabs and the electrode group, making the current transmission between the tabs and the electrode group more stable and reliable, reducing resistance and energy loss. By arranging the tabs in the insulating through-holes, the internal space of the battery cell can be effectively utilized, avoiding interference between the tabs and other components inside the battery cell, and making the internal structure of the battery cell more compact. Moreover, the insulating through-holes also provide insulation protection for the tabs, ensuring good insulation between the tabs and other conductive components, and reducing the risk of short circuit.

[0012] In an optional embodiment, in the width direction of the insulating member, the margin L1 between the insulating through-hole and the tab is ≥ 1 mm.

[0013] Beneficial effects: By setting an appropriate distance between the insulating through-hole and the tab in the width direction of the insulating member, the tab can be easily inserted into the connecting piece during assembly, preventing interference between the insulating member and the tab and tearing the tab.

[0014] In an optional embodiment, the cover plate assembly further includes a connecting piece, the insulating member is arranged between the connecting piece and the electrode group. In the width direction of the electrode group, two adjacent tabs are arranged oppositely, and the connecting piece is arranged between the two opposite tabs.

[0015] Beneficial effects: In the width direction of the electrode group, two adjacent tabs are arranged oppositely, and the connecting piece is placed between the two opposite tabs, so as to make full use of the space of the electrode group, make the internal structure of the battery cell more compact, and improve the space utilization rate inside the battery cell. Moreover, arranging the connecting piece between the two opposite tabs can play a certain supporting and fixing role, enhancing the connection stability between the tab and the connecting piece.

[0016] In an optional embodiment, in the length direction of the insulating member, the margin L2 between the connecting piece and the insulating through-hole is > L1.

[0017] Beneficial effects: In the length direction of the insulating member, the length of the connecting piece is greater than the length of the insulating through-hole, and the margin between the connecting piece and the insulating through-hole is reasonably set. By setting a reasonable margin, more buffer space is provided for the tab. When the tab is subjected to external force or deforms during the operation of the battery cell, the tab is not easily in contact with the edge of the insulating through-hole, nor will it extend from the insulating through-hole to the surface of the electrode group, thus reducing the risk of piercing the diaphragm. At the same time, it also reduces the possibility of internal short circuit caused by tab deformation, thereby prolonging the service life of the battery cell, reducing the probability of failure, and contributing to improving the overall reliability and stability of the battery cell.

[0018] In an alternative embodiment, the connecting piece includes a first connecting portion and a second connecting portion, and two opposite tab ears are bent towards each other and fixedly connected to the second connecting portion.

[0019] Advantageous effects: By bending two opposite tab ears towards each other and fixedly connecting them to the second connecting portion, a more compact layout can be achieved within a limited space, leaving more space for other components inside the battery cell, thereby improving the space utilization rate inside the battery cell; at the same time, the connection structure between the oppositely bent tab ears and the connecting piece has better mechanical strength, can withstand certain external forces and deformations, and improves the overall structural reliability of the battery cell.

[0020] In an alternative embodiment, the thickness of the insulating member is 0.2 mm - 1.2 mm.

[0021] Advantageous effects: By reasonably setting the thickness of the insulating member, not only can the strength of the insulating member be ensured, but also the insulating member can be prevented from being punctured by the connecting piece, improving the safety of the battery cell. Moreover, it can make the internal structure of the battery cell more compact and improve the space utilization rate inside the battery cell.

[0022] In an alternative embodiment, the cover plate assembly further includes a cover plate and a sealing plate. The cover plate is provided with a first through hole and two second through holes. The two second through holes are arranged at both ends in the length direction of the cover plate, and the first through hole is arranged between the two second through holes; the sealing plate is installed on the first through hole.

[0023] Advantageous effects: By reasonably setting the positions of the second through holes and the first through hole, during the process of assembling various components on the cover plate, it can enable the operator to more clearly distinguish the uses of through holes at different positions, improving the assembly efficiency. It can also enable the operator to quickly locate and handle problems related to specific through holes during maintenance. Moreover, while ensuring the functions of other components on the cover plate, the structural strength of the cover plate can be maintained to the greatest extent. Installing the sealing plate at the first through hole can perform targeted sealing at the first through hole, enhancing the overall sealing effect, better preventing electrolyte leakage or external impurities from entering, and ensuring the normal operation and safety of the battery cell.

[0024] In an alternative embodiment, it further includes: a housing having a receiving cavity and an opening communicating with the receiving cavity, and the cover plate assembly covers the opening; the electrode group is disposed in the receiving cavity.

[0025] Beneficial effects: The housing and cover assembly of the battery cell form a closed space, which can effectively protect the electrode group and other internal components from external physical damage, such as collision, extrusion, etc.; moreover, it can also block dust, moisture and other impurities from entering the accommodation cavity, avoiding affecting the normal operation of the battery cell and reducing the occurrence probability of faults such as short circuit and corrosion. The electrode group is arranged in the accommodation cavity and then sealed by the cover assembly. This assembly method is simple and efficient, and when it is necessary to maintain or replace internal components, the cover can be relatively conveniently opened for operation.

[0026] In a second aspect, the present invention also provides a battery pack, comprising: a plurality of the battery cells as described above.

[0027] Beneficial effects: Since the battery pack includes the battery cells, it has the same effects as the battery cells and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 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.

[0029] Figure 1 A perspective view of a battery cell according to an embodiment of the present invention;

[0030] Figure 2 is Figure 1 a top view of the battery cell shown;

[0031] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction in ;

[0032] Figure 4 A perspective view of the cooperation between the electrode group and the insulating member in the battery cell according to an embodiment of the present invention;

[0033] Figure 5 is Figure 4 a top view of the cooperation between the electrode group and the insulating member in the battery cell shown;

[0034] Figure 6 is Figure 5 a cross-sectional view taken along the B-B direction in ;

[0035] Figure 7 is Figure 4 a partial enlarged schematic view of A in ;

[0036] Figure 8 A perspective view of the cooperation between the tab and the connecting member in the battery cell according to an embodiment of the present invention;

[0037] Figure 9 A perspective view of the insulating member in the battery cell according to an embodiment of the present invention;

[0038] Figure 10 A perspective view of the cover assembly in the battery cell according to an embodiment of the present invention.

[0039] Explanation of reference numerals:

[0040] 100, housing; 200, insulating member; 210, insulating through-hole; 300, cover assembly; 310, connecting piece; 311, first connecting portion; 312, second connecting portion; 320, negative electrode post; 330, lower plastic sheet; 340, sealing plate; 341, explosion-proof valve; 342, liquid injection hole; 350, positive electrode post; 360, upper plastic ring; 370, sealing ring; 380, cover plate; 390, second insulating member; 381, first through-hole; 382, second through-hole; 400, electrode group; 410, tab; 420, separator. Detailed implementation manners

[0041] 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. Apparently, 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 skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] The following combines with Figures 1 to 10 , to describe the embodiments of the present invention.

[0043] According to an embodiment of the present invention, on the one hand, referring to Figures 1 to 7 , a battery cell is provided, including: a cover assembly 300, an insulating member 200, and an electrode group 400; the insulating member 200 is disposed between the cover assembly 300 and the electrode group 400, and the orthographic projection of the insulating member 200 on the electrode group 400 is within the end face range of the top of the electrode group 400; the distance L between the edge of the insulating member 200 and the edge of the electrode group 400 is 0.3 mm - 0.5 mm.

[0044] In this embodiment, when the internal structure of the battery cell is relatively compact, by arranging the insulating member 200 between the cover plate assembly 300 and the electrode group 400, the separator 420 of the electrode group 400 can be protected by the insulating member 200, preventing the separator 420 from being damaged and causing an internal short circuit of the battery cell, effectively improving the safety performance of the battery cell. The orthographic projection of the insulating member 200 on the electrode group 400 is within the end face range of the top of the electrode group 400, that is, there is a certain distance L between the edges around the insulating member 200 and the edges of the top end face of the electrode group 400. Specifically, it can be 0.3 mm, 0.4 mm, 0.5 mm, etc.; by reasonably setting the distance between the edge of the insulating member 200 and the edge of the electrode group 400, the occupation of the internal space of the battery cell by the insulating member 200 can be minimized to provide more layout space for other components, which helps to improve the space utilization rate inside the battery cell, and can also effectively cover the key areas that need insulation, prevent the risk of short circuit, and avoid waste of materials and increase of unnecessary weight caused by excessive coverage. Among them, the distance L between the edge of the insulating member 200 and the edge of the electrode group 400 can be determined according to actual usage requirements, and is not limited to 0.3 mm - 0.5 mm, and can also be 0.6 mm, 0.7 mm, 0.8 mm, etc.

[0045] In one embodiment, referring also to Figure 9 , a plurality of tabs 410 are provided on the electrode group 400, and the plurality of tabs 410 are integrally formed with the electrode group 400; insulating through holes 210 matching the plurality of tabs 410 are provided on the insulating member 200, and the tabs 410 are arranged in the insulating through holes 210.

[0046] In this embodiment, 4 tabs 410 can be provided on the electrode group 400, all integrally formed with the electrode group 400; 4 insulating through holes 210 matching the tabs 410 are provided on the insulating member 200, and the 4 tabs 410 are arranged in the 4 insulating through holes 210; by integrally forming the plurality of tabs 410 with the electrode group 400, the process of separately installing the tabs 410 is reduced, the production process is simplified, thereby improving the production efficiency of the battery cell; at the same time, the situation of poor connection between the tabs 410 and the electrode group 400 is also avoided, making the current transmission between the tabs 410 and the electrode group 400 more stable and reliable, reducing resistance and energy loss. By arranging the tabs 410 in the insulating through holes 210, the internal space of the battery cell can be effectively utilized, avoiding interference between the tabs 410 and other components inside the battery cell, making the internal structure of the battery cell more compact; and the insulating through holes 210 also provide insulating protection for the tabs 410, ensuring good insulation between the tabs 410 and other conductive components, reducing the risk of short circuit.

[0047] In one embodiment, in the width direction of the insulating member 200, the margin L1 between the insulating through-hole 210 and the tab 410 is ≥ 1 mm. Specifically, the margin L1 between the insulating through-hole 210 and the tab 410 can be 1 mm, 1.2 mm, 1.4 mm, etc., and can be set according to actual requirements without specific limitations. By setting an appropriate distance between the insulating through-hole 210 and the tab 410 in the width direction of the insulating member 200, the tab 410 can be easily inserted into the connecting piece 310 during assembly, preventing interference between the insulating member 200 and the tab 410 and tearing the tab 410.

[0048] In one embodiment, the cover plate assembly 300 further includes a connecting piece 310. The insulating member 200 is disposed between the connecting piece 310 and the electrode group 400. In the width direction of the electrode group 400, two adjacent tabs 410 are disposed opposite to each other, and the connecting piece 310 is disposed between the two opposite tabs 410.

[0049] In this embodiment, in the width direction of the electrode group 400, two adjacent tabs 410 are disposed opposite to each other, and the connecting piece 310 is disposed between the two opposite tabs 410, so as to make full use of the space of the electrode group 400, make the internal structure of the battery cell more compact, and improve the space utilization rate inside the battery cell; moreover, by disposing the connecting piece 310 between the two opposite tabs 410, it can play a certain supporting and fixing role, enhancing the connection stability between the tab 410 and the connecting piece 310.

[0050] In one embodiment, in the length direction of the insulating member 200, the margin L2 between the connecting piece 310 and the insulating through-hole 210 is > L1.

[0051] In this embodiment, in the length direction of the insulating member 200, the length of the connecting piece 310 is greater than the length of the insulating through-hole 210, and the margin L2 between the connecting piece 310 and the insulating through-hole 210 is > L1. That is, when the margin L1 between the insulating through-hole 210 and the tab 410 is 1 mm, the margin L2 between the connecting piece 310 and the insulating through-hole 210 can be 1.1 mm, 1.2 mm, etc. It is only necessary to ensure that L2 > L1, and the specific value of L2 is not limited and can be selected according to actual requirements. By setting a reasonable margin, more buffer space is provided for the tab 410. When the tab 410 is subjected to an external force or deforms during the operation of the battery cell, the tab 410 is not likely to contact the edge of the insulating through-hole 210, nor will it extend from the insulating through-hole 210 to the surface of the electrode group 400, thereby reducing the risk of piercing the separator 420; at the same time, it also reduces the possibility of internal short circuit caused by the deformation of the tab 410, thereby extending the service life of the battery cell, reducing the probability of failure, and helping to improve the overall reliability and stability of the battery cell.

[0052] In one embodiment, see alsoFigure 8 The connecting piece 310 includes a first connecting portion 311 and a second connecting portion 312. Two opposite tab ears 410 are bent towards each other and fixedly connected to the second connecting portion 312.

[0053] In this embodiment, by bending two opposite tab ears 410 in the width direction of the electrode group 400 towards each other and fixedly connecting them to the second connecting portion 312, a more compact layout can be achieved within a limited space, leaving more space for other components inside the battery cell and improving the space utilization rate inside the battery cell. At the same time, the connection structure between the oppositely bent tab ears 410 and the connecting piece 310 has better mechanical strength, can withstand a certain amount of external force and deformation, and improves the overall structural reliability of the battery cell.

[0054] In other embodiments, the connecting piece 310 further includes a third connecting portion. The first connecting portion 311 and the second connecting portion 312 are connected through the third connecting portion, and the third connecting portion enables the first connecting portion 311 and the second connecting portion 312 not to be on the same horizontal plane, so as to facilitate the connection of the first connecting portion 311 and the second connecting portion 312 to the pole post and the tab ear 410 respectively.

[0055] In other embodiments, a strip-shaped hole is provided on the second connecting portion 312 of the connecting piece 310, which can avoid affecting other structures on the connecting piece 310 during the welding process of the tab ear 410 and the second connecting portion 312.

[0056] In one of the embodiments, the thickness of the insulating member 200 is 0.2 mm - 1.2 mm. Specifically, the thickness of the insulating member 200 can be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, etc. The specific thickness of the insulating member 200 can be selected according to actual needs and is not specifically limited. By reasonably setting the thickness of the insulating member 200, both the strength of the insulating member 200 can be ensured and the insulating member 200 will not be punctured by the connecting piece 310, improving the safety of the battery cell. Moreover, the internal structure of the battery cell can be made more compact, and the space utilization rate inside the battery cell can be improved.

[0057] In one of the embodiments, the cover plate assembly 300 further includes a cover plate 380 and a sealing plate 340. The cover plate 380 is provided with a first through hole 381 and two second through holes 382. The two second through holes 382 are arranged at both ends in the length direction of the cover plate 380, and the first through hole 381 is arranged between the two second through holes 382. The sealing plate 340 is installed on the first through hole 381.

[0058] In this embodiment, by reasonably setting the positions of the second through-hole 382 and the first through-hole 381, during the process of assembling each component on the cover plate 380, 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. It can also maintain the structural strength of the cover plate 380 to the greatest extent while ensuring the functions of other components on the cover plate 380. Installing the sealing plate 340 at the first through-hole 381 can perform targeted sealing at the first through-hole 381, enhance the overall sealing effect, better prevent electrolyte leakage or external impurities from entering, and ensure the normal operation and safety of the battery cell.

[0059] In one embodiment, the cover plate assembly 300 further includes pole posts, and the pole posts include a positive pole post 350 and a negative pole post 320, which are respectively arranged in two second through-holes 382.

[0060] In this embodiment, by arranging the positive pole post 350 and the negative pole post 320 in the second through-holes 382 at both ends of the cover plate 380, the force on the cover plate 380 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 380 caused by uneven force can be reduced. By increasing the distance between the positive pole post 350 and the negative pole post 320, the risk of short circuit between the positive and negative poles caused by accidental factors can also be reduced.

[0061] In one embodiment, the sealing plate 340 is provided with an explosion-proof valve 341 and a liquid injection hole 342. By arranging the explosion-proof valve 341 and the liquid injection hole 342 on the sealing plate 340, the explosion-proof valve 341 and the liquid injection hole 342 will not limit the welding area of the connecting piece 310 and the pole tab 410; when the battery cell needs to have a large over-current capacity, the welding area of the connecting piece 310 and the pole tab 410 can be increased, and then the size of the first through-hole 381 or the position of the first through-hole 381 on the cover plate 380 can be adaptively changed, so as to facilitate increasing the welding area of the connecting piece 310 and the pole tab 410 and effectively improve the over-current capacity of the battery cell. Arranging the explosion-proof valve 341 and the liquid injection hole 342 on the sealing plate 340 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 short circuit of the battery cell, and thus ensure the safety performance and service life of the battery cell.

[0062] In one embodiment, the cover plate assembly 300 further includes an upper plastic ring 360 and a sealing ring 370, which are arranged between the pole post and the cover plate 380, and the pole post abuts against the cover plate 380 through the upper plastic ring 360 and the sealing ring 370.

[0063] In this embodiment, the upper plastic ring 360 and the sealing ring 370 are arranged between the terminal post and the cover plate 380, which can fill the tiny gaps between the terminal post and the cover plate 380, 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 360 and the sealing ring 370 can also play a buffering role, reducing the direct collision and wear between the terminal post and the cover plate 380, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring 360 has good insulation performance, which can prevent accidental conductive contact between the terminal post and the cover plate 380, thereby improving the electrical safety of the battery cell.

[0064] In one embodiment, referring also to Figure 10 , the cover plate assembly 300 further includes a lower plastic sheet 330, which is arranged between the cover plate 380 and the connecting piece 310; through holes are formed at the positions of the lower plastic sheet 330 corresponding to the first through hole 381 and the second through hole 382 on the cover plate 380, so as to facilitate the connection of the terminal post and the tab 410 to the connecting piece 310 through the through holes. A plurality of air holes for ventilation are also provided on the lower plastic sheet 330, and the positions of the plurality of air holes are arranged opposite to the explosion-proof valve 341 on the cover plate 380, so as to quickly discharge the gas inside the battery cell. The lower plastic sheet 330 has good insulation performance and can also prevent accidental conductive contact between the terminal post and the cover plate 380, further improving the electrical safety of the battery cell.

[0065] In one embodiment, the cover plate assembly 300 further includes a second insulating member 390, which is arranged between the lower plastic sheet 330 and the sealing plate 340, and the size of the insulating member 200 is smaller than that of the sealing plate 340; by providing the insulating member 200, the conductive contact between the tab 410 and the sealing plate 340 can be effectively prevented, thereby improving the electrical safety of the battery cell.

[0066] In one embodiment, the battery cell further includes: a housing 100, the housing 100 has a receiving cavity and an opening communicating with the receiving cavity, and the cover plate assembly 300 seals the opening; the electrode assembly 400 is arranged in the receiving cavity.

[0067] In this embodiment, the opening on the battery cell housing 100 is sealed by the cover plate assembly 300, so that the battery cell housing 100 and the cover plate assembly 300 form a closed space, which can effectively protect the electrode group 400 and other internal components from external physical damage, such as collision, extrusion, etc.; moreover, it can also block dust, moisture and other impurities from entering the accommodation cavity, avoid affecting the normal operation of the battery cell, and reduce the occurrence probability of faults such as short circuit and corrosion. The electrode group 400 is arranged in the accommodation cavity and then sealed by the cover plate assembly 300. This assembly method is simple and efficient, and when it is necessary to maintain or replace internal components, the cover plate 380 can be relatively conveniently opened for operation. The shape and size of the battery cell housing 100 can be designed according to actual needs to make full use of the available space inside the battery cell and improve the space utilization rate inside the battery cell.

[0068] In one of the embodiments, the upper plastic ring 360, the lower plastic sheet 330, the sealing ring 370, the positive electrode post 350, the negative electrode post 320, the connecting piece 310, the sealing plate 340 and the second insulating member 390 can be assembled into a whole and supplied in the form of a component, which simplifies the assembly process of the battery cell.

[0069] In this embodiment, the battery cell includes, but is not limited to, a lithium-ion battery cell.

[0070] According to an embodiment of the present invention, on the other hand, a battery pack is also provided, including: a plurality of battery cells as described above. A plurality of battery cells form a battery module, and a plurality of battery modules form a battery pack. The battery pack has the same effects as the battery cell and will not be elaborated here.

[0071] Although the embodiments of the present invention are 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 cell, characterized in that: include: Cover plate assembly, insulation and pole group; The insulating member is arranged between the cover plate assembly and the pole group, and the orthographic projection of the insulating member on the pole group is located within the end surface range of the top of the pole group; The distance L between the edge of the insulating member and the edge of the pole group is 0.3 mm-0.5 mm.

2. The battery cell according to claim 1, characterized in that: The pole group is provided with a plurality of pole ears, and the plurality of pole ears are integrally formed with the pole group; the insulating member is provided with an insulating through hole matching the plurality of pole ears, and the pole ears are arranged in the insulating through hole.

3. The battery cell according to claim 2, characterized in that: In the width direction of the insulating member, a margin distance L1 between the insulating through hole and the pole ear is ≥1 mm.

4. The battery cell according to claim 3, characterized in that: The cover plate assembly further includes a connecting piece, the insulating member is arranged between the connecting piece and the pole group, and in the width direction of the pole group, two adjacent pole ears are arranged opposite to each other, and the connecting piece is arranged between the two opposite pole ears.

5. The battery cell according to claim 4, characterized in that: In the length direction of the insulating member, the margin L2 between the connecting piece and the insulating through hole is greater than L1.

6. The battery cell according to claim 4, characterized in that: The connecting piece includes a first connecting portion and a second connecting portion, and the two opposite pole ears are bent toward each other and fixedly connected to the second connecting portion.

7. The battery cell according to claim 1, characterized in that: The thickness of the insulating member is 0.2 mm-1.2 mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The cover plate assembly also includes a cover plate and a sealing plate. The cover plate is provided with a first through hole and two second through holes. The two second through holes are arranged at both ends of the cover plate in the length direction, and the first through hole is arranged between the two second through holes. The sealing plate is installed on the first through hole.

9. The battery cell according to any one of claims 1 to 7, characterized in that: Also includes: The shell has a housing cavity and an opening communicating with the housing cavity, and the cover plate assembly covers the opening; the pole group is arranged in the housing cavity.

10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9.

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