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, the battery cell mainly comprises a shell, a pair of poles, a pair of connecting sheets, a sealing plate and an insulating plate; a pair of mounting holes and a through hole are formed in one side of the shell at intervals in the length direction, the through hole is located between the pair of mounting holes, and a plurality of pole groups and a plurality of pairs of pole lugs in one-to-one correspondence with the pole groups are arranged in the shell; the pair of poles are respectively arranged on the pair of mounting holes; the pair of connecting sheets are arranged on the pole groups and on the inner side of the shell, one end of each connecting sheet is connected with the pole column, and the other opposite end of each connecting sheet extends to the through hole and is connected with the tab; the sealing plate and the insulating plate are arranged in the through hole, at least one groove is formed in the bottom face of the sealing plate, at least one protrusion is correspondingly arranged on the top face of the insulating plate, and the protrusions are inserted into the grooves. According to the utility model, the connecting sheets and the tabs are arranged in the through holes, so that the bending times can be reduced, the space utilization rate is improved, the sealing plate and the insulating plate are matched and connected through the grooves and the bulges, and the reliability is stronger.

Description

Technical Field

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

[0002] With the development of new energy technologies, battery packs are increasingly used in various new energy products. In a battery pack, a terminal is connected to an ear of a battery cell through a connecting piece to achieve electrical conduction.

[0003] However, during the connection process of the connecting piece and the ear, bending is required, and the connecting piece, the terminal, and the ear are usually located on the same vertical plane, so a relatively large thickness space needs to be occupied, resulting in low space utilization rate of the battery cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell and a battery pack to solve the problem that the existing connecting piece connecting the terminal and the ear needs to occupy a relatively large thickness space, resulting in low space utilization rate of the battery cell.

[0005] In a first aspect, the utility model provides a battery cell, comprising:

[0006] A housing, on one side of which a pair of mounting holes and a through hole are provided at intervals along the length direction, the through hole being located between the pair of mounting holes, and a plurality of electrode groups and a plurality of pairs of ears corresponding to the electrode groups one by one are provided inside the housing;

[0007] A pair of terminals, respectively arranged on the pair of mounting holes;

[0008] A pair of connecting pieces, arranged on the plurality of electrode groups and on the inner side of the housing, one end of the connecting piece being connected to the terminal, and the opposite end extending to the through hole and being connected to the ear;

[0009] A sealing plate and an insulating plate, arranged in the through hole, at least one groove being provided on the bottom surface of the sealing plate, and at least one protrusion being correspondingly provided on the top surface of the insulating plate, the protrusion being inserted into the groove.

[0010] Advantageous Effects: The utility model opens a through hole on the housing, and one end of the connecting piece is connected to the ear at the through hole, reducing the number of bends of the connecting piece and the ear, thereby reducing the thickness dimension. The other end of the connecting piece is connected to the terminal, and the terminal and the ear are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate of the battery cell. Moreover, at least one groove is provided on the bottom surface of the sealing plate and is cooperatively connected with the protrusion on the top surface of the insulating plate, which can increase the contact area between the sealing plate and the insulating plate, improve the binding force of the sealing plate on the insulating glue, ensure the connection strength between the sealing plate and the insulating plate, and ensure the insulation performance between the ear and the sealing plate, thereby improving the reliability of the battery cell.

[0011] In an alternative embodiment, the top surface of the insulating plate is injection-molded onto the bottom surface of the sealing plate, the groove gradually contracts from inside to outside, and the protrusion is clamped in the groove.

[0012] Advantageous effects: The sealing plate and the insulating plate are integrally formed by an injection molding process, further improving the connection strength and sealing performance between the sealing plate and the insulating plate. The groove gradually contracts from inside to outside, that is, the bottom area of the groove is larger than the notch area, and correspondingly, the top area of the protrusion is larger than the bottom area, so that the protrusion can be clamped in the groove, further increasing the contact area between the sealing plate and the insulating plate and improving the connection stability between the two.

[0013] In an alternative embodiment, the groove is an inverted conical groove, the protrusion is correspondingly provided as an inverted conical protrusion, and the outer diameter of the inverted conical groove is d, satisfying: 0.5 mm ≤ d ≤ 6 mm.

[0014] Advantageous effects: The groove is an inverted conical groove and the protrusion is correspondingly provided as an inverted conical protrusion, which can ensure the connection strength after injection molding of the sealing plate and the insulating plate.

[0015] In an alternative embodiment, the outer diameter d of the inverted conical groove and the inner diameter D of the inverted conical groove satisfy: d - D ≥ 0.3 mm.

[0016] Advantageous effects: By setting the dimensions of the outer diameter and the inner diameter of the inverted conical groove, it can ensure that the inverted conical protrusion is clamped in the inverted conical groove.

[0017] In an alternative embodiment, the distance between the upper surface of the sealing plate and the bottom of the inverted conical groove is t, satisfying: 0.2 mm ≤ t ≤ 1.5 mm.

[0018] Advantageous effects: By setting the distance between the upper surface of the sealing plate and the bottom of the inverted conical groove, the thickness of the part of the sealing plate without the inverted conical groove can be limited to ensure the structural strength of the sealing plate.

[0019] In an alternative embodiment, the through hole is a rectangular through hole, the length direction of the rectangular through hole is consistent with the length direction of the housing, and the peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole.

[0020] Advantageous effects: The through hole being a rectangular through hole can adapt to the pole ear and the connecting piece. The length direction of the rectangular through hole being consistent with the length direction of the housing can reduce the space occupied by the rectangular through hole in the width direction of the housing to improve the structural strength of the housing. The peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole to seal the rectangular through hole.

[0021] In an alternative embodiment, the pole ear includes a bent portion formed by converging the end of the pole group, and the bent portion is connected to the connecting piece.

[0022] Beneficial effect: After the tab is folded to form a bent portion, it only needs to be bent once to achieve connection with the connecting piece, and the connecting piece can be connected to the bent portion and the pole without bending. Therefore, the total number of bending times is small, reducing the thickness space occupied by the bending of the tab and the connecting piece, thereby improving the space utilization of the battery cell, and also omitting the bending process of the connecting piece, improving the production efficiency of the battery cell.

[0023] In an optional embodiment, an insulating rubber ring and a sealing ring are further provided between the pole and the shell, the insulating rubber ring is arranged at the upper end of the sealing ring, and an insulating rubber plate is further provided between the shell and the connecting plate, the insulating rubber plate is provided with a through hole, and the through hole is arranged outside the sealing ring.

[0024] Beneficial effect: The insulating rubber ring is located at the upper end of the sealing ring, which plays the role of insulation and sealing. The sealing ring is arranged between the insulating rubber ring and the limiting part, which can further improve the sealing effect. The insulating rubber plate is sleeved outside the sealing ring through the through hole and indirectly sleeved outside the pole to achieve the limiting of the insulating rubber plate and play an insulating effect on the connecting piece.

[0025] In an optional embodiment, the sealing plate is further provided with a liquid injection hole, and the insulating plate is provided with a through hole communicating with the liquid injection hole;

[0026] And / or, the sealing plate is provided with a first air outlet hole, and the insulating plate is provided with a second air outlet hole connected with the first air outlet hole.

[0027] Beneficial effects: The injection hole and the through hole are used to add electrolyte, and the first air outlet hole and the second air outlet hole can connect the inside of the shell with the outside, so that the excess gas in the shell can be discharged in time to prevent the internal air pressure of the shell from increasing and expanding.

[0028] In a second aspect, the utility model further provides a battery pack, comprising: a plurality of the above-mentioned battery cells.

[0029] Beneficial effect: Because the battery pack includes a battery cell, it has the same effect as the battery cell, that is, a through hole is opened on the shell, one end of the connecting piece is connected to the pole ear at the through hole, the number of bending times of the connecting piece and the pole ear is reduced, thereby reducing the thickness dimension, and the other end of the connecting piece is connected to the pole column, and the pole column and the pole ear are staggered, further reducing the thickness dimension and improving the space utilization rate of the battery cell. In addition, the bottom surface of the sealing plate is provided with at least one groove, which is matched and connected with the protrusion on the top surface of the insulating plate, which can increase the contact area between the sealing plate and the insulating plate, improve the binding force of the sealing plate on the insulating glue, ensure the connection strength between the sealing plate and the insulating plate, and ensure the insulation performance of the pole ear and the sealing plate, thereby improving the reliability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present invention;

[0032] Figure 2 Cross-sectional view of a battery cell according to an embodiment of the present invention;

[0033] Figure 3 Partial structural schematic diagram of a battery cell according to an embodiment of the present invention;

[0034] Figure 4 Structural schematic diagram of the tab and connection piece of a battery cell according to an embodiment of the present invention;

[0035] Figure 5 Structural schematic diagram of the sealing plate and insulating plate of a battery cell according to an embodiment of the present invention;

[0036] Figure 6 Cross-sectional view of the sealing plate and insulating plate of a battery cell according to an embodiment of the present invention;

[0037] Figure 7 For Figure 6 Enlarged view of part A;

[0038] Figure 8 Structural schematic diagram of the insulating plate of a battery cell according to an embodiment of the present invention.

[0039] Explanation of reference numerals:

[0040] 1. Housing; 101. Through hole; 2. Electrode group; 3. Tab; 301. Bent portion; 4. Terminal; 5. Connection piece; 6. Sealing plate; 601. Groove; 602. First air vent; 7. Insulating plate; 701. Protrusion; 702. Through hole; 703. Second air vent; 8. Insulating rubber ring; 9. Sealing ring; 10. Insulating rubber plate; 11. Liquid injection hole. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 8 , describing the embodiments of the present utility model.

[0043] According to an embodiment of the present utility model, on the one hand, as Figures 1 to 3 shown, a battery cell is provided, mainly including: a housing 1, a pair of pole columns 4, a pair of connection plates 5, a sealing plate 6, and an insulating plate 7. A pair of mounting holes and through holes 101 are provided at intervals along the length direction on one side of the housing 1. The through holes 101 are located between the pair of mounting holes. A plurality of pole groups 2 and a plurality of pairs of pole tabs 3 corresponding to the pole groups 2 one by one are provided inside the housing 1. A pair of pole columns 4 are respectively provided on the pair of mounting holes. A pair of connection plates 5 are provided on the plurality of pole groups 2 and on the inner side of the housing 1. One end of the connection plate 5 is connected to the pole column 4, and the opposite end extends to the through hole 101 and is connected to the pole tab 3. The sealing plate 6 and the insulating plate 7 are provided in the through hole 101. At least one groove 601 is provided on the bottom surface of the sealing plate 6, and at least one protrusion 701 is correspondingly provided on the top surface of the insulating plate 7. The protrusion 701 is inserted into the groove 601.

[0044] For the battery cell provided by the embodiment of the present utility model, a through hole 101 is opened on the housing 1, and one end of the connection plate 5 is connected to the pole tab 3 at the through hole 101, reducing the number of bends of the connection plate 5 and the pole tab 3, thereby reducing the thickness dimension. The other end of the connection plate 5 is connected to the pole column 4, and the pole column 4 and the pole tab 3 are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate of the battery cell. Moreover, at least one groove 601 is provided on the bottom surface of the sealing plate 6 and is connected in cooperation with the protrusion 701 on the top surface of the insulating plate 7, which can increase the contact area between the sealing plate 6 and the insulating plate 7, improve the binding force of the sealing plate 6 on the insulating glue, ensure the connection strength between the sealing plate 6 and the insulating plate 7, and ensure the insulation performance between the pole tab 3 and the sealing plate 6, thereby improving the reliability of the battery cell.

[0045] Specifically, the through hole 101 is used to reserve an installation space for the connection of the connection plate 5 and the pole tab 3. The sealing plate 6 is used to seal the through hole 101. The insulating plate 7 can provide an insulating effect on the sealing plate 6. By providing the sealing plate 6 and the insulating plate 7 in the through hole 101 and connecting the top surface of the insulating plate 7 to the bottom surface of the sealing plate 6, the occupied space of the sealing plate 6 and the insulating plate 7 can be reduced. To improve the connection strength between the sealing plate 6 and the insulating plate 7, a plurality of grooves 601 and protrusions 701 can be provided.

[0046] The top and bottom directions of the embodiments of the present utility model are as Figure 1 shown.

[0047] It should be noted that the embodiments of the present utility model do not limit the materials of the sealing plate 6 and the insulating plate 7, and any existing materials can be selected according to needs. For example, the sealing plate 6 can be made of aluminum plate, and the insulating plate 7 can be made of polypropylene plate (PP plate).

[0048] Specifically, as Figure 1 shown, side plates are arranged around the housing 1, a bottom plate is provided at the bottom, and a top plate is provided at the top. The four side plates, the top plate and the bottom plate are integrally formed and enclose a cavity. Through holes 101 and a pair of mounting holes are provided on the top plate. A plurality of electrode groups 2 are stacked and arranged in the cavity. A plurality of pairs of electrode tabs 3 are arranged on one side of the plurality of electrode groups 2 close to the electrode posts 4. Each electrode group 2 is correspondingly provided with a positive electrode tab and a negative electrode tab. Since the electrode posts 4 are arranged on the housing 1 and the electrode tabs 3 are installed at the through holes 101, the electrode tabs 3 and the electrode posts 4 are arranged in a staggered manner, so that the installation thickness can be reduced and the space utilization rate can be improved.

[0049] A pair of electrode posts 4 includes a positive electrode post and a negative electrode post. The connecting pieces 5 correspond to the electrode posts 4 one by one. One of the connecting pieces 5 connects the positive electrode post and the positive electrode tabs of the plurality of electrode groups 2, and the other connecting piece 5 connects the negative electrode post and the negative electrode tabs of the plurality of electrode groups 2. The connecting pieces 5 need to be conductive to realize the electrical connection between the electrode tabs 3 and the electrode posts 4. A gap is left between the two connecting pieces 5 to prevent the positive electrode post from being short-circuited with the negative electrode post. The electrode tabs 3 are bent 90 degrees along the width direction of the housing 1 and then adhered to the top surface of the connecting piece 5 to reduce the size of the through holes 101 and improve the structural strength of the housing 1. The connecting pieces 5 extend along the length direction of the top plate without being bent, further reducing the installation thickness. The length direction of the top plate is the same as the length direction of the housing 1.

[0050] It should be noted that the embodiments of the present utility model do not limit the number of the electrode groups 2 in the battery cell, and two, three or more than three can be selected. Exemplarily, as Figure 3 and Figure 4 shown, two electrode groups 2 are provided, and each of the two electrode groups 2 is provided with a positive electrode tab and a negative electrode tab. The two positive electrode tabs are arranged side by side and are welded to one connecting piece 5 after being bent. The two negative electrode tabs are arranged side by side and are welded to the other connecting piece 5 after being bent. The positive electrode tabs and the negative electrode tabs both extend along the width direction of the top plate. The width direction of the top plate is the same as the width direction of the housing 1.

[0051] In one embodiment, the top surface of the insulating plate 7 is injection-molded onto the bottom surface of the sealing plate 6. The groove 601 gradually contracts from inside to outside, and the protrusion 701 is clamped tightly within the groove 601. The sealing plate 6 and the insulating plate 7 are integrally formed by an injection molding process, further enhancing the connection strength and sealing performance between the sealing plate 6 and the insulating plate 7. The groove 601 gradually contracts from inside to outside, that is, the bottom area of the groove 601 is larger than the notch area. Correspondingly, the top area of the protrusion 701 is larger than the bottom area, enabling the protrusion 701 to be clamped tightly within the groove 601, further increasing the contact area between the sealing plate 6 and the insulating plate 7, and improving the connection stability between the two.

[0052] Further, in one embodiment, as Figure 6 and Figure 7 shown, the groove 601 is an inverted conical groove. As Figure 8 shown, the protrusion 701 is correspondingly provided as an inverted conical protrusion. The outer diameter of the inverted conical groove is d, satisfying: 0.5 mm ≤ d ≤ 6 mm. This can ensure the connection strength after injection molding of the sealing plate 6 and the insulating plate 7.

[0053] Even further, in one embodiment, the outer diameter d of the inverted conical groove and the inner diameter D of the inverted conical groove satisfy: d - D ≥ 0.3 mm. By setting the dimensions of the outer diameter and the inner diameter of the inverted conical groove, it can ensure that the inverted conical protrusion is clamped tightly within the inverted conical groove.

[0054] Even further, in one embodiment, the distance between the upper surface of the sealing plate 6 and the bottom of the inverted conical groove is t, satisfying: 0.2 mm ≤ t ≤ 1.5 mm. By setting the distance between the upper surface of the sealing plate 6 and the bottom of the inverted conical groove, it can limit the thickness of the part of the sealing plate 6 without the inverted conical groove to ensure the structural strength of the sealing plate 6.

[0055] In one embodiment, as Figure 3 shown, the through hole 101 is a rectangular through hole. The length direction of the rectangular through hole is consistent with the length direction of the housing 1. The peripheral wall of the sealing plate 6 is welded to the peripheral hole walls of the rectangular through hole. Welding can be performed by laser welding. The through hole 101 being a rectangular through hole can adapt to the tab 3 and the connecting piece 5. The length direction of the rectangular through hole being consistent with the length direction of the housing 1 can reduce the space occupied by the rectangular through hole in the width direction of the housing 1 to improve the structural strength of the housing 1. The peripheral wall of the sealing plate 6 is welded to the peripheral hole walls of the rectangular through hole to seal the rectangular through hole.

[0056] In one embodiment, as Figure 4 shown, the tab 3 includes a bent portion 301 formed by converging the end of the electrode group 2, and the bent portion 301 is connected to the connecting piece 5. Specifically, the connection part between the connecting piece 5 and the bent portion 301 is a plane, and after the bent portion 301 is bent 90°, it is welded to the upper surface of the connecting piece 5.

[0057] After the pole tab 3 is folded to form the bent portion 301, it only needs to be bent once to achieve connection with the connecting piece 5, and the connecting piece 5 can be connected to the bent portion 301 and the pole 4 without bending. Therefore, the total number of bending times is small, which reduces the thickness space occupied by the bending of the pole tab 3 and the connecting piece 5, thereby improving the space utilization of the battery cell, and can also omit the bending process of the connecting piece 5, thereby improving the production efficiency of the battery cell.

[0058] In one embodiment, Figure 2 As shown, an insulating rubber ring 8 and a sealing ring 9 are also provided between the pole 4 and the housing 1. The insulating rubber ring 8 is provided at the upper end of the sealing ring 9. An insulating rubber plate 10 is also provided between the housing 1 and the connecting piece 5. The insulating rubber plate 10 is provided with a through hole, and the through hole is sleeved outside the sealing ring 9. The insulating rubber ring 8 is located at the upper end of the sealing ring 9, and plays the role of insulation and sealing. The sealing ring 9 is arranged between the insulating rubber ring 8 and the limiting part, which can further improve the sealing effect. The insulating rubber plate 10 is sleeved outside the sealing ring 9 through the through hole, and indirectly sleeved outside the pole 4, so as to realize the limiting of the insulating rubber plate 10 and play an insulating effect on the connecting piece 5.

[0059] It should be noted that the embodiment of the utility model does not limit the material of the sealing ring 9. For example, the sealing ring 9 can be a conventional sealing ring such as a rubber sealing ring or a silicone sealing ring. In addition, the material of the insulating rubber ring 8 and the insulating rubber plate 10 is not limited. For example, the insulating rubber ring 8 and the insulating rubber plate 10 can both be plastic parts.

[0060] In one embodiment, Figure 1 and Figure 5 As shown, the sealing plate 6 is also provided with a liquid injection hole 11. Figure 8 As shown, the insulating plate 7 is provided with a through hole 702 which is connected to the liquid injection hole 11. The liquid injection hole 11 and the through hole 702 are used for adding electrolyte.

[0061] and / or, if Figure 5 As shown, the sealing plate 6 is provided with a first air outlet 602, and the insulating plate 7 is provided with a second air outlet 703 connected to the first air outlet 602. The first air outlet 602 and the second air outlet 703 can connect the chamber inside the housing 1 with the outside, so that the excess gas in the housing 1 can be discharged in time to prevent the internal air pressure of the housing 1 from increasing and expanding. In order to ensure the sealing of the battery cell, an explosion-proof valve is also provided at the first air outlet 602, and the explosion-proof valve is opened when the internal air pressure of the battery cell is greater than the preset air pressure to discharge the excess gas.

[0062] According to an embodiment of the present utility model, on the other hand, a battery pack is provided, mainly comprising: a plurality of battery cells.

[0063] Since the battery pack includes battery cells and has the same effect as the battery cells, that is, through holes 101 are provided on the housing 1, one end of the connecting piece 5 is connected to the tab 3 at the through holes 101, reducing the number of bends of the connecting piece 5 and the tab 3, thereby reducing the thickness dimension. The other end of the connecting piece 5 is connected to the terminal 4, and the terminal 4 and the tab 3 are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate of the battery cell. Moreover, at least one groove 601 is provided on the bottom surface of the sealing plate 6 and is connected in cooperation with the protrusion 701 on the top surface of the insulating plate 7, which can increase the contact area between the sealing plate 6 and the insulating plate 7, improve the binding force of the sealing plate 6 on the insulating glue, ensure the connection strength between the sealing plate 6 and the insulating plate 7, and ensure the insulation performance between the tab 3 and the sealing plate 6, thereby improving the reliability of the battery cell.

[0064] Specifically, multiple battery cells can be connected in series, in parallel, or in a combination of series and parallel. In this regard, the embodiments of the present invention do not impose many restrictions.

[0065] 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 fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, one side of which is provided with a pair of mounting holes and a through hole at intervals along the length direction, wherein the through hole is located between the pair of mounting holes, and the shell is provided with a plurality of pole groups and a plurality of pairs of pole ears corresponding to the pole groups one by one; A pair of poles, respectively arranged on the pair of mounting holes; A pair of connecting pieces, arranged on the plurality of pole groups and arranged on the inner side of the housing, one end of the connecting piece is connected to the pole column, and the other end extends to the through hole and is connected to the pole ear; A sealing plate and an insulating plate are arranged in the through hole. The bottom surface of the sealing plate is provided with at least one groove, and the top surface of the insulating plate is correspondingly provided with at least one protrusion, and the protrusion is inserted into the groove.

2. The battery cell according to claim 1, characterized in that: The top surface of the insulating plate is injection molded on the bottom surface of the sealing plate, the groove gradually shrinks from the inside to the outside, and the protrusion is clamped in the groove.

3. The battery cell according to claim 2, characterized in that: The groove is an inverted conical groove, and the protrusion is correspondingly set to an inverted conical protrusion. The outer diameter of the inverted conical groove is d, which satisfies: 0.5mm≤d≤6mm.

4. The battery cell according to claim 3, characterized in that: The outer diameter d of the inverted tapered groove and the inner diameter D of the inverted tapered groove satisfy: dD≥0.3mm.

5. The battery cell according to claim 4, characterized in that: The distance between the upper surface of the sealing plate and the bottom of the inverted tapered groove is t, which satisfies: 0.2 mm ≤ t ≤ 1.5 mm.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The through hole is a rectangular through hole, the length direction of the rectangular through hole is consistent with the length direction of the shell, and the peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The electrode tab includes a bent portion formed by gathering the ends of the electrode group, and the bent portion is connected to the connecting sheet.

8. The battery cell according to any one of claims 1 to 5, characterized in that: An insulating rubber ring and a sealing ring are also provided between the pole and the shell. The insulating rubber ring is arranged at the upper end of the sealing ring. An insulating rubber plate is also provided between the shell and the connecting piece. The insulating rubber plate is provided with a through hole. The through hole is sleeved outside the sealing ring.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The sealing plate is also provided with a liquid injection hole, and the insulating plate is provided with a through hole connected to the liquid injection hole; And / or, the sealing plate is provided with a first air outlet hole, and the insulating plate is provided with a second air outlet hole connected with the first air outlet hole.

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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