Battery cell and battery pack

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery cell and a battery pack, and the battery cell comprises a shell, one side of which is provided with an opening; the cover plate is installed at the opening of the shell, a pair of pole columns are installed on the cover plate, the pole columns penetrate through the cover plate, and a pair of through grooves are formed in the cover plate and located between the pair of pole columns; the pair of connecting pieces comprises a column connecting part and a lug connecting part, the column connecting part is located on the lower side of the pole, a contact boss is arranged at the position, opposite to the pole, of the column connecting part, the contact boss is welded to the lower end of the pole, a welding blind groove is formed in the position, opposite to the pole, of the lower side of the contact boss, and the lug connecting part and the through groove are oppositely arranged and used for being welded to a lug of the battery cell; according to the utility model, the problems that the assembly speed is influenced and the production efficiency is limited as the assembly operation and the welding operation of the tab and the connecting sheet and the assembly operation and the welding operation of the pole and the connecting sheet are complicated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery cell and a battery pack. Background Art

[0002] The power battery is the main power source of new energy vehicles and is responsible for providing continuous and stable electric energy for the vehicle. The power battery is composed of multiple battery cell units connected in series. Each battery cell structure includes a pole group inside and a housing. Positive and negative electrode tabs are provided on the pole group for leading out the current of the pole group, and a pole post is provided on the housing. The pole post is connected to the corresponding electrode tab through a connecting piece, thereby connecting the battery cell to the circuit.

[0003] In the related art, the electrode tab led out from the pole group is arranged on the lower side of the pole post. A connecting piece is arranged on the lower side of the pole post. The connecting piece is arranged in a U shape with two parallel connecting parts. The two connecting parts of the connecting piece are arranged up and down relatively. One connecting part is connected to the bottom end of the pole post, and the other is connected to the electrode tab, thereby realizing the connection between the pole post and the pole group, and realizing the conduction between the pole post and the electrode tab through the transfer of the connecting piece.

[0004] However, in the above-mentioned related art, since the electrode tab is arranged below the corresponding pole post and the connecting piece is arranged in a U shape, the welding operations of the electrode tab and the connecting piece, and the connecting piece and the pole post are relatively complex. At the same time, since the pole post is positioned and connected to the connecting piece through a connecting member, the assembly operation is complex, which restricts the production efficiency to a certain extent. Summary of the Utility Model

[0005] In view of this, the utility model provides a battery cell and a battery pack to solve the problems that the assembly operations and welding operations of the electrode tab and the connecting piece, and the pole post and the connecting piece are complex, affecting the assembly speed and restricting the production efficiency.

[0006] In a first aspect, the utility model provides a battery cell, including a housing with an opening on one side; a cover plate installed at the opening of the housing. A pair of pole posts are installed on the cover plate, and the pole posts penetrate through the cover plate. A pair of through grooves are arranged between the pair of pole posts on the cover plate; a pair of connecting pieces, the connecting piece includes a post connecting part and an ear connecting part. The post connecting part is located below the pole post, and a contact boss is arranged at a position on the post connecting part opposite to the pole post. The contact boss is welded to the lower end of the pole post. A welding blind groove is arranged at a position on the lower side of the contact boss opposite to the pole post. The ear connecting part is arranged opposite to the through groove for welding with the electrode tab of the battery cell; a pair of sealing plates, the peripheral contours of which are respectively adapted to the corresponding through grooves and are buckled at the corresponding through grooves.

[0007] Beneficial effects: The shell and the cover plate are designed for split assembly, which facilitates the installation of the electrode group into the shell. The cover plate is provided to close the top opening of the shell, realizing the limitation and protection of the electrode group. A through groove is opened on the cover plate, reserving an operating space for the welding of the electrode tab and the connecting piece. After the battery is assembled, it is convenient for the staff to operate on the electrode tab. Since the connecting piece includes a column connecting part and an ear connecting part that are misaligned with each other in the longitudinal direction, and the column connecting part is connected to the electrode post, and the ear connecting part is connected to the electrode tab of the battery cell, the layout of the power connection structure between the electrode tab and the electrode post is improved, reducing the utilization of the longitudinal space inside the shell and reserving more space for the setting of the electrode core. At the same time, a contact boss is provided on the column connecting part opposite to the lower end of the electrode post, and a welding blind groove is provided on the lower side of the column connecting part. When the staff welds the column connecting part and the electrode post by ultrasonic welding, penetration welding, etc., it can quickly and accurately locate the welding position. At the same time, the welding blind groove limits the welding head of the welding equipment, and the welding head is not easy to shift during the welding process, avoiding affecting the welding quality. In addition, the setting of the welding blind groove also reduces the thickness of the relative position between the connecting piece and the electrode post, improving the welding efficiency and welding quality.

[0008] In an alternative embodiment, the connecting piece further includes a folded edge. The column connecting part and the ear connecting part are both parallel to the cover plate. The column connecting part and the ear connecting part are respectively connected to two ends of the folded edge. The folded edge is perpendicular to the cover plate so that the column connecting part is higher than the ear connecting part.

[0009] Beneficial effects: Through the setting of the folded edge, the column connecting part is slightly higher than the ear connecting part, thus optimizing the structural layout. While the column connecting part can be in close contact with the electrode post, a certain interval can also be formed between the ear connecting part and the lower surface of the cover plate, avoiding the situation that during the process, due to component size errors or assembly errors, the connecting piece and the cover plate are squeezed and rubbed, resulting in the failure of the insulation structure, short circuit and shell leakage.

[0010] In an alternative embodiment, a pair of downwardly protruding limiting frames are provided on the lower side of the cover plate. The whole formed by the folded edge and the column connecting part is adapted to the limiting frames, and one end of the folded edge connected to the column connecting part extends into the limiting frames.

[0011] Beneficial effects: The setting of the limiting frames facilitates the staff to quickly locate the installation position of the connecting piece, improving the assembly efficiency. At the same time, it can also limit the connecting piece during the subsequent welding process, ensuring the welding accuracy between the column connecting part of the connecting piece and the electrode post, and improving the product quality.

[0012] In an alternative embodiment, a connection hole is provided at a position on the cover plate corresponding to the pole post. The pole post passes through the connection hole. A first insulating member is provided on the lower side of the cover plate. The first insulating member is disposed around the connection hole, and the first insulating member is respectively located between the limiting frame and the folded edge, between the limiting frame and the post connection portion, and between the ear connection portion and the cover plate, so as to separate the connection piece from the cover plate.

[0013] Advantageous effects: By arranging the first insulating member around the connection hole, the first insulating member separates the limiting frame from the folded edge, the limiting frame from the connection portion, and the ear connection portion from the cover plate respectively. Thus, while the connection piece remains in contact with the pole post, the connection piece is also prevented from contacting the cover plate.

[0014] In an alternative embodiment, a second insulating member is provided on the lower surface of the cover plate. The second insulating member is adapted to the lower surface of the cover plate. A relief groove is formed in the second insulating member, and the relief groove is disposed opposite to the two through grooves.

[0015] Advantageous effects: By arranging the second insulating member, the cover plate is separated from the housing, and the cover plate is separated from various structures on the lower side of the cover plate. At the same time, the relief groove makes way for the through groove, so that the ear connection portion can be exposed from the position of the through groove.

[0016] In an alternative embodiment, two reinforcing ribs are provided on the second insulating member. The two reinforcing ribs are respectively disposed on both sides in the width direction of the cover plate, and the two reinforcing ribs are located in the middle of the cover plate in the length direction.

[0017] Advantageous effects: By arranging the reinforcing ribs and making the reinforcing ribs be respectively disposed in the middle of the cover plate in the length direction, the structure in the middle of the cover plate can be strengthened, effectively preventing the middle of the cover plate from collapsing, and improving the compressive resistance of the battery cell. By arranging the reinforcing ribs on both sides in the width direction of the cover plate, interference with the pole ear welding operation is avoided.

[0018] In an alternative embodiment, flanges are respectively provided at both ends of the second insulating member in the length direction of the cover plate. The flanges are arranged along the edge contour of the end of the cover plate and are adapted to the opening of the housing.

[0019] Advantageous effects: By arranging the flanges, the flanges are adapted to the opening, thus forming a positioning portion adapted to the opening of the housing, facilitating the positioning of the cover plate on the top of the housing and also facilitating the welding of the cover plate to the housing.

[0020] In an alternative embodiment, a connection hole is provided at a position on the cover plate corresponding to the pole post. The pole post includes an integrally formed cylindrical portion and an extension portion. The extension portion is located above the cylindrical portion. The diameter of the cylindrical portion is less than or equal to the diameter of the connection hole, and the diameter of the extension portion is greater than the diameter of the connection hole. A first sealing ring is provided on the circumferential side of the pole post. A part of the first sealing ring is located within the connection hole, and another part is located between the extension portion and the upper surface of the cover plate.

[0021] Advantageous effects: The extension portion of the pole post is located outside the connection hole, and the cylindrical portion is located within the connection hole. A part of the first sealing ring is located within the connection hole, and another part is located between the extension portion and the top wall of the cover plate. The extension portion and the upper surface of the cover plate jointly clamp the first sealing ring. At the same time, the first sealing ring separates the extension portion from the cover plate, thereby avoiding the situation of the pole post being short-circuited with the cover plate and causing the housing to leak electricity. And since the first sealing ring surrounds the circumferential side of the connection hole, it can also play a role in sealing the connection hole to prevent liquid from passing through the connection hole.

[0022] In an alternative embodiment, a second sealing ring is provided on the circumferential side of the pole post. The second sealing ring is located within the connection hole and below the first sealing ring.

[0023] Advantageous effects: By providing the second sealing ring on the circumferential side of the pole post and within the connection hole, the cylindrical portion of the pole post is isolated from the connection hole, and the sealing effect at the connection hole is further improved.

[0024] In a second aspect, the present invention also provides a battery pack, including: a plurality of the above-mentioned battery cells.

[0025] Advantageous effects: The battery cell group in the battery pack is composed of the above-mentioned battery cells, which improves the space utilization rate within the housing, thereby improving the overall performance of the battery pack. And by changing the power connection structure between the tab and the pole post, while optimizing the space utilization rate, it also reduces the difficulty of assembly operation and improves the production efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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 following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is an overall schematic diagram of a battery cell according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of a battery cell according to an embodiment of the present invention for showing the cover plate;

[0029] Figure 3 is Figure 2 A schematic diagram of another perspective of the content in

[0030] Figure 4 is a cross-sectional schematic diagram of a battery cell according to an embodiment of the present invention for showing the internal structure of the housing;

[0031] Figure 5 is Figure 4 An enlarged schematic diagram of A in

[0032] Figure 6 is a schematic diagram of a pole group of a battery cell according to an embodiment of the present invention for showing the state before the ear is bent;

[0033] Figure 7 is a schematic diagram of a battery cell according to an embodiment of the present invention for showing the state of the pole group and the connecting piece after the ear is bent.

[0034] Explanation of reference numerals in the drawings:

[0035] 100, housing; 200, cover plate; 201, pole column; 2011, cylindrical part; 2012, extended part; 202, through groove; 203, limiting frame; 204, connecting hole; 205, liquid injection hole; 300, connecting piece; 301, column connecting part; 3011, contact boss; 3012, welding blind groove; 302, ear connecting part; 303, flanging; 400, sealing plate; 500, first insulating part; 600, second insulating part; 601, reinforcing rib; 602, flanging; 701, first sealing ring; 702, second sealing ring; 800, pole group; 801, ear. Detailed implementation manners

[0036] 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.

[0037] Next, in conjunction with Figures 1 to 7 , the embodiments of the present invention will be described.

[0038] According to an embodiment of the present invention, on the one hand, a battery cell is provided. Please refer to Figures 1 to 4, including a housing 100 with an opening on one side; a cover plate 200 installed at the opening of the housing 100, with a pair of pole columns 201 installed on the cover plate 200. The pole columns 201 penetrate through the cover plate 200, and a pair of through slots 202 are provided between the pair of pole columns 201 on the cover plate 200; a pair of connecting pieces 300, the connecting piece 300 includes a column connecting part 301 and an ear connecting part 302. The column connecting part 301 is located below the pole column 201, and a contact boss 3011 is provided at a position on the column connecting part 301 opposite to the pole column 201. The contact boss 3011 is welded to the lower end of the pole column 201, and a welding blind groove 3012 is provided at a position on the lower side of the contact boss 3011 opposite to the pole column 201. The ear connecting part 302 is arranged opposite to the through slot 202 for welding with the pole ear 801 of the battery cell; a pair of sealing plates 400, the peripheral contours of which are respectively adapted to the corresponding through slots 202 and are buckled at the corresponding through slots 202.

[0039] In this embodiment, the housing 100 and the cover plate 200 are designed for split assembly, which is convenient for the pole group 800 to be installed into the housing 100. The cover plate 200 is provided to close the top opening of the housing 100, realizing the limitation and protection of the pole group 800. Through slots 202 are opened on the cover plate 200, reserving an operating space for the welding of the pole ear 801 and the connecting piece 300. After the battery is assembled, it is convenient for the staff to operate on the pole ear 801. Since the connecting piece 300 includes a column connecting part 301 and an ear connecting part 302 that are arranged offset from each other in the longitudinal direction, and the column connecting part 301 is connected to the pole column 201, and the ear connecting part 302 is connected to the pole ear 801 of the battery cell, the layout of the power connection structure between the pole ear 801 and the pole column 201 is improved, reducing the utilization of the longitudinal space inside the housing 100 and reserving more space for the setting of the pole core. At the same time, a contact boss 3011 is provided on the column connecting part 301 opposite to the lower end of the pole column 201, and a welding blind groove 3012 is provided on the lower side of the column connecting part 301. When the staff welds the column connecting part 301 and the pole column 201 by ultrasonic welding, penetration welding, etc., it is possible to quickly and accurately position the welding position. At the same time, the welding blind groove 3012 limits the welding head of the welding equipment, and the welding head is not easily offset during the welding process, avoiding affecting the welding quality. In addition, the setting of the welding blind groove 3012 also reduces the thickness of the relative position between the connecting piece 300 and the pole column 201, improving the welding efficiency and welding quality.

[0040] In the above embodiment, please refer to Figure 2 、 Figure 6 and Figure 7, specifically, a pair of pole columns 201 are respectively arranged at both ends of the cover plate 200 in the length direction, and two through grooves 202 are arranged between the pair of pole columns 201. The sealing plate 400 is buckled on the through groove 202 and welded to the groove wall of the through groove 202. A liquid injection hole 205 is arranged in the middle of the cover plate 200. A pole group 800 is arranged in the housing 100. A plurality of pole tabs 801 are arranged on the upper side of the pole group 800. The pole tabs 801 are respectively arranged opposite to the through grooves 202 and are bent towards the corresponding ear connection parts 302. After the staff installs the cover plate 200 on the housing 100, the pole tabs 801 are welded to the ear connection parts 302 of the connecting piece 300 through the through grooves 202.

[0041] In one embodiment, the connecting piece 300 further includes a folded edge 303. The column connection part 301 and the ear connection part 302 are both parallel to the cover plate 200. The column connection part 301 and the ear connection part 302 are respectively connected to both ends of the folded edge 303. The folded edge 303 is perpendicularly arranged to the cover plate 200 so that the column connection part 301 is higher than the ear connection part 302.

[0042] Specifically, the column connection part 301, the folded edge 303 and the ear connection part 302 are integrally formed. The column connection part 301 and the ear connection part 302 are arranged parallel to the cover plate 200.

[0043] In this embodiment, through the arrangement of the folded edge 303, the column connection part 301 is slightly higher than the ear connection part 302, thereby optimizing the structural layout. While the column connection part 301 can be in close contact with the pole column 201, a certain interval can also be formed between the ear connection part 302 and the lower surface of the cover plate 200, avoiding extrusion and friction between the connecting piece 300 and the cover plate 200 due to component size errors or assembly errors during the process, resulting in the failure of the insulation structure, short circuit and leakage of the housing 100.

[0044] In one embodiment, please refer to Figure 4 and Figure 5 , a pair of downwardly protruding limiting frames 203 are arranged on the lower side of the cover plate 200. The whole formed by the folded edge 303 and the column connection part 301 is adapted to the limiting frame 203. One end of the folded edge 303 connected to the column connection part 301 extends into the limiting frame 203.

[0045] In this embodiment, the arrangement of the limiting frame 203 facilitates the staff to quickly locate the installation position of the connecting piece 300, improves the assembly efficiency, and can also limit the connecting piece 300 during the subsequent welding process, ensuring the welding accuracy of the column connection part 301 of the connecting piece 300 and the pole column 201 and improving the product quality.

[0046] In one embodiment, please refer to Figure 4 and Figure 5, a connection hole 204 is provided at a position on the cover plate 200 corresponding to the pole column 201. The pole column 201 passes through the connection hole 204. A first insulating member 500 is provided on the lower side of the cover plate 200. The first insulating member 500 is arranged on the periphery of the connection hole 204, and the first insulating member 500 is respectively located between the limiting frame 203 and the folded edge 303, the limiting frame 203 and the column connection part 301, and the ear connection part 302 and the cover plate 200, so as to separate the connecting piece 300 from the cover plate 200.

[0047] In this embodiment, by arranging the first insulating member 500 on the periphery of the connection hole 204, the first insulating member 500 separates the limiting frame 203 from the folded edge 303, the limiting frame 203 from the connection part, and the ear connection part 302 from the cover plate 200 respectively, so that while the connecting piece 300 remains in contact with the pole column 201, the connecting piece 300 is also prevented from contacting the cover plate 200.

[0048] In one embodiment, a second insulating member 600 is provided on the lower surface of the cover plate 200. The second insulating member 600 is adapted to the lower surface of the cover plate 200. A relief groove is formed on the second insulating member 600, and the relief groove is arranged opposite to the two through grooves 202.

[0049] In this embodiment, by arranging the second insulating member 600, the cover plate 200 is separated from the housing 100, and the cover plate 200 is separated from each structure on the lower side of the cover plate 200. At the same time, the relief groove makes way for the through groove 202, so that the ear connection part 302 can be exposed from the position of the through groove 202.

[0050] In one embodiment, two reinforcing ribs 601 are provided on the second insulating member 600. The two reinforcing ribs 601 are respectively arranged on both sides of the cover plate 200 in the width direction, and the two reinforcing ribs 601 are located in the middle of the cover plate 200 in the length direction.

[0051] Specifically, the two reinforcing ribs 601 are located in the middle of the cover plate 200 in the length direction. The two reinforcing ribs 601 divide the second insulating member 600 into two parts respectively located at both ends of the cover plate 200 in the length direction. The reinforcing ribs 601 are formed by hollow bulges protruding downward from the second insulating member 600, so as to enhance the strength of the cover plate 200 while reducing the overall weight of the cover plate 200.

[0052] In this embodiment, by arranging the reinforcing ribs 601 and making the reinforcing ribs 601 be respectively arranged in the middle of the cover plate 200 in the length direction, the middle structure of the cover plate 200 can be strengthened, effectively preventing the middle of the cover plate 200 from collapsing, and improving the compressive capacity of the battery cell. By arranging the reinforcing ribs 601 on both sides of the cover plate 200 in the width direction, interference with the welding operation of the pole ear 801 is avoided.

[0053] In one embodiment, please refer to Figure 3, the second insulating member 600 is provided with flanges 602 at both ends in the length direction of the cover plate 200. The flanges 602 are arranged along the edge contour of the end of the cover plate 200 and are adapted to the opening of the housing 100.

[0054] In this embodiment, by providing the flanges 602 which are adapted to the opening, a positioning portion adapted to the opening of the housing 100 is formed, facilitating the positioning of the cover plate 200 at the top of the housing 100 and also facilitating the welding of the cover plate 200 to the housing 100.

[0055] It should be noted that, in some of the above embodiments, the first insulating member 500 and the second insulating member 600 are integrally formed.

[0056] In one embodiment, please refer to Figure 4 and Figure 5 , the pole column 201 includes a columnar portion 2011 and an extension portion 2012 which are integrally formed. The extension portion 2012 is located on the upper side of the columnar portion 2011. The diameter of the columnar portion 2011 is less than or equal to the diameter of the connection hole 204, and the diameter of the extension portion 2012 is greater than the diameter of the connection hole 204. A first sealing ring 701 is provided on the circumferential side of the pole column 201. A part of the first sealing ring 701 is located in the connection hole 204, and the other part is located between the extension portion 2012 and the upper surface of the cover plate 200.

[0057] In this embodiment, the extension portion 2012 of the pole column 201 is located outside the connection hole 204, and the columnar portion 2011 is located in the connection hole 204. A part of the first sealing ring 701 is located in the connection hole 204, and the other part is located between the extension portion 2012 and the top wall of the cover plate 200. The extension portion 2012 and the upper surface of the cover plate 200 jointly clamp the first sealing ring 701. At the same time, the first sealing ring 701 separates the extension portion 2012 from the cover plate 200, thus avoiding the situation that the pole column 201 is short-circuited with the cover plate 200 resulting in the leakage of electricity of the housing 100. And since the first sealing ring 701 surrounds the circumferential side of the connection hole 204, it can also play a role in sealing the connection hole 204 to prevent liquid from passing through the connection hole 204.

[0058] In one embodiment, please refer to Figure 4 and Figure 5 , a second sealing ring 702 is provided on the circumferential side of the pole column 201. The second sealing ring 702 is located in the connection hole 204 and is located below the first sealing ring 701.

[0059] In this embodiment, by providing the second sealing ring 702 on the circumferential side of the pole column 201 and located in the connection hole 204, the columnar portion 2011 of the pole column 201 is isolated from the connection hole 204, and the sealing effect at the connection hole 204 is further improved.

[0060] According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, including: a plurality of the above-described battery cells.

[0061] In this embodiment, the battery cell group in the battery pack is composed of the above-described battery cells, which improves the space utilization rate inside the housing 100, thereby improving the overall performance of the battery pack. And by changing the power connection structure between the tab 801 and the terminal 201, while optimizing the space utilization rate, the assembly operation difficulty is also reduced, and the production efficiency of the battery pack is improved.

[0062] Although the embodiments of the present utility model 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 utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having an opening on one side; A cover plate mounted at the opening of the housing. A pair of pole columns are mounted on the cover plate, the pole columns penetrate through the cover plate, and a pair of through slots are provided between the pair of pole columns on the cover plate; A pair of connecting pieces, the connecting piece includes a column connecting portion and an ear connecting portion. The column connecting portion is located below the pole column, and a contact boss is provided at a position on the column connecting portion opposite to the pole column. The contact boss is welded to the lower end of the pole column, and a welding blind groove is provided at a position on the lower side of the contact boss opposite to the pole column. The ear connecting portion is arranged opposite to the through slot for welding with the pole ear of the battery cell; A pair of sealing plates, the peripheral contours of which are respectively adapted to the corresponding through slots and are buckled at the corresponding through slots.

2. The battery cell according to claim 1, characterized in that The connecting piece further includes a folded edge. The column connecting portion and the ear connecting portion are both parallel to the cover plate. The column connecting portion and the ear connecting portion are respectively connected to two ends of the folded edge. The folded edge is perpendicular to the cover plate so that the column connecting portion is higher than the ear connecting portion.

3. The battery cell according to claim 2, wherein, A pair of downwardly protruding limiting frames are provided on the lower side of the cover plate. The whole formed by the folded edge and the column connecting portion is adapted to the limiting frame, and one end of the folded edge connected to the column connecting portion extends into the limiting frame.

4. The battery cell according to claim 3, wherein, A connecting hole is provided at a position on the cover plate corresponding to the pole column. The pole column passes through the connecting hole. A first insulating member is provided on the lower side of the cover plate. The first insulating member is provided on the periphery of the connecting hole, and the first insulating member is respectively located between the limiting frame and the folded edge, the limiting frame and the column connecting portion, and the ear connecting portion and the cover plate, so as to separate the connecting piece from the cover plate.

5. The battery cell according to claim 4, characterized in that, A second insulating member is provided on the lower surface of the cover plate. The second insulating member is adapted to the lower surface of the cover plate. A relief groove is provided on the second insulating member, and the relief groove is arranged opposite to the two through slots.

6. The battery cell according to claim 5, wherein, Two reinforcing ribs are provided on the second insulating member. The two reinforcing ribs are respectively arranged on both sides in the width direction of the cover plate, and the two reinforcing ribs are located in the middle in the length direction of the cover plate.

7. The battery cell according to claim 6, wherein Flanging portions are respectively provided at both ends of the second insulating member in the length direction of the cover plate. The flanging portions are arranged along the edge contour of the end of the cover plate and are adapted to the opening of the housing.

8. The cell according to claim 7, characterized in that, The pole column includes an integrally formed columnar portion and an extended portion. The extended portion is located above the columnar portion. The diameter of the columnar portion is less than or equal to the diameter of the connecting hole, and the diameter of the extended portion is greater than the diameter of the connecting hole. A first sealing ring is provided on the periphery of the pole column. A part of the first sealing ring is located in the connecting hole, and the other part is located between the extended portion and the upper surface of the cover plate.

9. The battery cell according to claim 8, wherein A second sealing ring is provided on the periphery of the pole column. The second sealing ring is located in the connecting hole and below the first sealing ring.

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

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