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 comprises: a housing, in which an accommodating cavity is formed, and one end of the housing is provided with an opening; the pole group is arranged in the accommodating cavity; an electrode terminal mounted on the case; at least part of the structure of the electrode terminal is located in the accommodating cavity and is electrically connected with the electrode group; the opening is arranged to allow the electric connection part of the electrode terminal and the pole group to be exposed; the insulation sealing piece is connected with the shell and blocks the opening, a liquid injection hole is formed in the insulation sealing piece, and the liquid injection hole is communicated with the containing cavity; and moreover, a convex column is arranged on one side, facing the accommodating cavity, of the insulating sealing element, and is positioned on one side of the liquid injection hole, so that a gap is formed between the pole group and the liquid injection hole. According to the battery cell and the battery pack, the liquid injection hole can be effectively prevented from being blocked, and the production efficiency of the battery cell is improved.

Description

Technical Field

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

[0002] A battery cell generally includes a housing, a pole group and electrode terminals. The pole group is disposed inside the housing, and the electrode terminals are mounted on the housing and electrically connected to the pole group. A liquid injection hole is provided on the housing, and the liquid injection hole is used for injecting electrolyte into the interior of the housing.

[0003] However, in the actual manufacturing process of the battery cell, when injecting electrolyte through the liquid injection hole, the liquid injection hole is prone to blockage, resulting in the inability to inject electrolyte or difficult injection, thus reducing production efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defect that in the related art, the liquid injection hole is prone to blockage, resulting in the inability to inject electrolyte or difficult injection, and reducing production efficiency, so as to provide a battery cell and a battery pack.

[0005] In a first aspect, the utility model provides a battery cell, comprising: a housing, an accommodation cavity is formed inside the housing, and an opening is provided at one end of the housing; a pole group, disposed in the accommodation cavity; electrode terminals, mounted on the housing; at least part of the structure of the electrode terminals is located in the accommodation cavity and is electrically connected to the pole group; the opening is arranged to allow the electrical connection part of the electrode terminals and the pole group to be exposed; an insulating seal, connected to the housing and sealing the opening, a liquid injection hole is provided on the insulating seal, and the liquid injection hole communicates with the accommodation cavity; and, a convex column is provided on the side of the insulating seal facing the accommodation cavity, the convex column is located on one side of the liquid injection hole, so as to form a gap between the pole group and the liquid injection hole.

[0006] Optionally, there are at least two convex columns, and the at least two convex columns are arranged at intervals around the liquid injection hole.

[0007] Optionally, along the axial direction of the liquid injection hole, the height range of the convex column is 0.3 - 5 mm, and the cross-sectional area of the convex column is greater than or equal to 0.6 mm 2 .

[0008] Optionally, the inner diameter of the liquid injection hole is greater than or equal to 3 mm.

[0009] Optionally, the insulating seal includes a metal part and an insulating part injection-molded on one side of the metal part. The metal part is connected to the housing and seals the opening, and the insulating part is located on the side of the metal part close to the accommodation cavity; a first through hole is provided on the metal part, a second through hole is provided on the insulating part, the second through hole corresponds to the first through hole, and they jointly form the liquid injection hole.

[0010] Optionally, an annular boss is provided on the side of the insulating part facing the accommodation cavity, the annular boss surrounds the outside of the liquid injection hole, and the convex column is arranged on the annular boss.

[0011] Optionally, a concavo-convex structure is provided between the metal part and the insulating part. The concavo-convex structure includes a groove and a boss that are fitted and connected to each other. The groove is provided in the first of the metal part and the insulating part, and an annular rib is provided at the notch of the groove around the metal part and the first of the insulating part. The boss is provided in the second of the metal part and the insulating part, and the annular rib is clamped on the outer peripheral side of the boss.

[0012] Optionally, there are two sets of concavo-convex structures, and the two sets of concavo-convex structures are arranged at intervals between the metal part and the insulating part; and the concavo-convex structures and the liquid injection holes are arranged staggeredly.

[0013] Optionally, an explosion-proof valve is provided on the metal part, and the explosion-proof valve is located on one side of the first through hole; the insulating part is provided with a hollow structure, and the hollow structure is arranged corresponding to the explosion-proof valve.

[0014] In a second aspect, the present utility model further provides a battery pack, including: at least one battery cell as described above.

[0015] By using the technical solution of the present utility model, a convex column is provided on the side of the insulating seal facing the accommodation cavity, and the convex column is located on one side of the liquid injection hole, so that a gap is formed between the electrode group and the liquid injection hole, thereby avoiding contact between the electrode group and other structures and the liquid injection hole during the liquid injection process and blocking the liquid injection hole, and in the negative pressure vacuum pumping process of the battery cell, it is convenient to extract gas through this gap, thereby improving the production efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0018] Figure 2 It is a schematic partial structural diagram of a battery cell according to an embodiment of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the outside of an insulating seal according to an embodiment of the present utility model;

[0020] Figure 4 It is a schematic structural diagram of the inside of an insulating seal according to an embodiment of the present utility model;

[0021] Figure 5 For Figure 4 The partial enlarged view of A in

[0022] Figure 6 A cross-sectional view and a partial enlarged view of an insulating seal according to an embodiment of the present utility model;

[0023] Figure 7 A schematic structural diagram of a metal part according to an embodiment of the present utility model;

[0024] Figure 8 A schematic structural diagram of an insulating part according to an embodiment of the present utility model.

[0025] Explanation of reference numerals in the drawings:

[0026] 1. Housing; 11. Accommodating cavity; 12. Opening;

[0027] 2. Electrode group; 21. Tab;

[0028] 3. Electrode terminal; 31. Terminal post; 32. Connecting piece;

[0029] 4. Insulating seal; 41. Liquid injection hole; 411. First through hole; 412. Second through hole; 413. Annular boss; 414. Convex post; 42. Metal part; 43. Insulating part; 44. Concave-convex structure; 441. Groove; 442. Boss; 443. Annular rib; 444. Annular groove; 45. Explosion-proof valve; 46. Hollow structure. Detailed implementation manners

[0030] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] The following combines with Figures 1 to 8 , to describe the embodiments of the present utility model.

[0032] Among them, Figure 1 A schematic structural diagram of a battery cell according to an embodiment of the present utility model; Figure 2 A partial structural diagram of a battery cell according to an embodiment of the present utility model, specifically, a structural diagram when the insulating seal 4 is not provided at the opening 12 of the housing 1; Figure 3 A schematic structural diagram of the outside of the insulating seal 4 according to an embodiment of the present utility model, that is, a schematic structural diagram of the side of the insulating seal 4 away from the accommodating cavity 11; Figure 4 A schematic structural diagram of the inside of the insulating seal 4 according to an embodiment of the present utility model, that is, a schematic structural diagram of the side of the insulating seal 4 facing the accommodating cavity 11;Figure 5 is Figure 4 a partial enlarged view of A in; Figure 6 a sectional view and a partial enlarged view thereof of an insulating seal 4 according to an embodiment of the present invention, wherein, Figure 6 in (a) is a sectional view of the insulating seal 4, and the up-down direction thereof is the thickness direction of the insulating seal 4, Figure 6 in (b) is Figure 6 a partial enlarged view of B in (a); Figure 7 a structural schematic diagram of a metal part 42 according to an embodiment of the present invention, specifically a structural schematic diagram of the side of the metal part 42 facing the insulating part 43; Figure 7 a structural schematic diagram of an insulating part 43 according to an embodiment of the present invention, specifically a structural schematic diagram of the side of the insulating part 43 facing the metal part 42.

[0033] According to an embodiment of the present invention, a battery pack is provided, which includes at least one battery cell. It can be understood that the battery pack may include one, two or more battery cells, and the present invention does not specifically limit the number of battery cells provided, as long as the design requirements are met.

[0034] Furthermore, as Figure 1 and Figure 2 shown, the battery cell includes a housing 1, a pole group 2 disposed in the housing 1, and an electrode terminal 3 mounted on the housing 1. Specifically, a receiving cavity 11 is formed in the housing 1, and an opening 12 is provided on the housing 1. The pole group 2 is disposed in the receiving cavity 11. At least part of the structure of the electrode terminal 3 is exposed outside the housing 1 for power transmission with external components, and at least part of the structure of the electrode terminal 3 is located in the receiving cavity 11 and is electrically connected to the pole group 2. The opening 12 of the housing 1 is configured to allow the electrical connection part of the electrode terminal 3 and the pole group 2 to be exposed, so as to facilitate the electrical connection between the electrode terminal 3 and the pole group 2.

[0035] Furthermore, the battery cell further includes an insulating seal 4, and the insulating seal 4 is connected to the housing 1 and seals the opening 12. As Figure 3 and Figure 4 shown, a liquid injection hole 41 is provided on the insulating seal 4, and the liquid injection hole 41 communicates with the receiving cavity 11. The liquid injection hole 41 is used to inject electrolyte into the pole group 2. And, a convex column 414 is provided on the side of the insulating seal 4 facing the receiving cavity 11, that is, the convex column 414 is provided on the inner side of the insulating seal 4. The convex column 414 is located on one side of the liquid injection hole 41, so as to form a gap between the pole group 2 and the liquid injection hole 41.

[0036] In this embodiment, a convex column 414 is provided on the side of the insulating seal 4 facing the accommodation cavity 11. The convex column 414 is located on one side of the liquid injection hole 41, so that a gap is formed between the electrode group 2 and the liquid injection hole 41, thereby preventing the electrode group 2 and other structures from contacting and blocking the liquid injection hole 41 during the liquid injection process. Moreover, during the negative pressure vacuum pumping process of the battery cell, it is convenient to extract gas through this gap, thereby improving the production efficiency of the battery cell.

[0037] Furthermore, in some embodiments, there are at least two convex columns 414. The at least two convex columns 414 are arranged at intervals around the liquid injection hole 41, and the above-mentioned gap is formed between adjacent two convex columns 414. Exemplarily, as Figure 5 shown, there are four convex columns 414. The four convex columns 414 are spaced around the periphery of the liquid injection hole 41 and are evenly spaced. The above-mentioned gap is formed between adjacent two convex columns 414. During the liquid injection process, the convex columns 414 can form a barrier between the liquid injection hole 41 and the electrode group 2 and other structures (such as high-temperature tapes, etc.) to prevent blocking of the liquid injection hole 41, and the gap formed between the convex columns 414 can also play a role in guiding the flow. During the negative pressure vacuum pumping process, it guides the gas to flow out.

[0038] It can be understood that the present invention does not specifically limit the number of the convex columns 414. The convex columns 414 can also be set to one, two, three, five, six or other numbers. Moreover, the present invention does not specifically limit the shape and structure of the convex columns 414, as long as they have sufficient structural strength. Exemplarily, the convex columns 414 can be cylindrical, square-columnar, prismatic, conical or other irregular structures.

[0039] In some embodiments, along the axial direction of the liquid injection hole 41, that is, the direction from the outside to the inside of the insulating seal 4, the height range of the convex column 414 is 0.3 - 5 mm. If the height of the convex column 414 is less than 0.3 mm, the anti-blocking ability is poor; if it is greater than 5 mm, it occupies too much internal space of the battery cell. Moreover, along the axial direction of the liquid injection hole 41, the cross-sectional area of the convex column 414 is greater than or equal to 0.6 mm 2 , if the cross-sectional area of the convex column 414 is too small, the structural strength is poor.

[0040] In some embodiments, the inner diameter of the liquid injection hole 41 is greater than or equal to 3 mm to ensure the liquid injection efficiency. The present invention does not specifically limit the shape and structure of the liquid injection hole 41, as long as it can achieve the function of injecting liquid into the electrode group 2.

[0041] Specifically, in some embodiments, as Figures 6 - 8As shown, the insulating seal 4 includes a metal part 42 and an insulating part 43 injection-molded on one side of the metal part 42. The metal part 42 is connected to the housing 1 and seals the opening 12 to ensure the tightness inside the battery cell. Exemplarily, the metal part 42 is welded or adhered to the housing 1, etc. The insulating part 43 is located on the side of the metal part 42 close to the accommodation cavity 11, that is, Figure 7 the side shown in

[0042] As shown in Figure 7 the metal part 42 is provided with a first through hole 411. As shown in Figure 8 the insulating part 43 is provided with a second through hole 412. The second through hole 412 is correspondingly arranged with the first through hole 411 and is interconnected therewith to jointly form the liquid injection hole 41. Exemplarily, the first through hole 411 and the second through hole 412 are arranged opposite to each other. Exemplarily, a convex part is provided on the side of the metal part 42 facing the insulating part 43, and the first through hole 411 is formed in the convex part; a concave part is provided on the side of the insulating part 43 facing the metal part 42, and the second through hole 412 is formed in the concave part. When the metal part 42 is connected to the insulating part 43, the convex part and the concave part are mutually engaged so that the first through hole 411 and the second through hole 412 are opposite to each other. Exemplarily, both the first through hole 411 and the second through hole 412 can be configured as stepped holes. Exemplarily, as shown in Figure 5 the port of the first through hole 411 where it communicates with the second through hole 412 can be slightly smaller than the second through hole 412 to prevent the electrolyte from flowing outside the liquid injection hole 41.

[0043] Furthermore, in some embodiments, as shown in Figure 5 the insulating part 43 is provided with an annular boss 413 on the side facing the accommodation cavity 11. The annular boss 413 surrounds the outside of the liquid injection hole 41, and a convex column 414 is provided on the annular boss 413. The provision of the annular boss 413 can avoid thickening the insulating part 43, saving materials and the internal space of the battery cell.

[0044] In some embodiments, as shown in Figure 6 an uneven structure 44 is provided between the metal part 42 and the insulating part 43. The uneven structure 44 includes a groove 441 and a boss 442 that are mutually engaged and connected. The groove 441 is provided on the first of the metal part 42 and the insulating part 43, and an annular rib 443 is provided at the notch of the groove 441 around the metal part 42 and the insulating part 43. The boss 442 is provided on the second of the metal part 42 and the insulating part 43, and the annular rib 443 is clamped on the outer peripheral side of the boss 442. The boss 442 and the groove 441 are engaged and connected, ensuring the stability of the relative position and the connection strength between the metal part 42 and the insulating part 43, and further ensuring the insulation performance between the metal part 42 and the electrode group 2, and improving the reliability of the battery cell.

[0045] In some embodiments, the first of the above-mentioned metal part 42 and the insulating part 43 is the metal part 42, and the second of the metal part 42 and the insulating part 43 is the insulating part 43. Specifically, a groove 441 is provided on the side of the metal part 42 facing the insulating part 43, and an annular rib 443 is provided at the notch of the groove 441 of the metal part 42. A boss 442 is provided on the side of the insulating part 43 facing the metal part 42, and an annular clamping groove 444 is formed on the outer peripheral side of the boss 442. The annular rib 443 is clamped in the annular clamping groove 444. Among them, the annular rib 443 is integrally formed on the metal part 42, and the boss 442 is integrally formed on the insulating part 43. With such a setting, it is easy to manufacture the metal part 42 and improve production efficiency.

[0046] Exemplarily, the metal part 42 can be a metal plate, and the above-mentioned groove 441 and annular rib 443 can be directly formed on the metal plate through a stamping process, which is easy to manufacture. Exemplarily, the metal part 42 can be an aluminum plate.

[0047] Exemplarily, the insulating part 43 can be an insulating plate, and the insulating plate is formed on one side of the metal part 42 through an injection molding process. Exemplarily, the insulating part 43 can be made of polypropylene or other insulating materials.

[0048] It can be understood that the shape and structure of the metal part 42 depend on the shape and structure of the opening 12, so as to be able to block the opening 12, and the shape and structure of the groove 441 are adapted to the shape and structure of the boss 442, so as to be able to fit with each other.

[0049] Further, in some embodiments, the thickness range of the metal part 42 is 0.6 - 1.6 mm. As Figure 6 shown, the thickness of the metal part 42 refers to T1. T1 within this thickness range can ensure that the metal part 42 has sufficient structural strength.

[0050] In some embodiments, the thickness range of the insulating part 43 is 0.15 - 1.2 mm. As Figure 6 shown, the thickness of the insulating part 43 refers to T2. T2 within this thickness range can ensure the reliability of the structural strength and insulation performance of the insulating part 43.

[0051] In some embodiments, the thickness range of the insulating seal 4 is 1.2 - 1.8 mm. As Figure 6 shown, the thickness of the insulating seal 4 refers to T. T within this thickness range can not only ensure the structural strength of the metal part 42 and the insulating part 43, but also avoid occupying too much internal space of the battery cell. It can be understood that since there are grooves 441 and bosses 442 that are fitted and connected between the metal part 42 and the insulating part 43, the sum of T1 and T2 should be greater than T.

[0052] Further, in some embodiments, the thickness range of the annular rib 443 is 0.25 - 0.55 mm, and the spacing range between the annular rib 443 and the bottom wall of the groove 441 is 0.25 - 0.55 mm. As Figure 6 shown, the thickness of the annular rib 443 refers to t1, and the spacing between the annular rib 443 and the bottom wall of the groove 441 refers to t2. When t1 is within this thickness range and t2 is within this spacing range, the strength of the cooperation between the groove 441 and the boss 442 can be ensured, and the tight fit between the metal part 42 and the insulating part 43 can be achieved.

[0053] Further, in some embodiments, in the direction perpendicular to the thickness direction of the annular rib 443, that is, Figure 6 in the left - right direction in Figure 6 , the minimum inner diameter range of the annular rib 443 is 0.35 - 1.2 mm, that is,

[0054] L in Figure 6 . Wherein, the root of the boss 442, that is, the connection part of the boss 442 and the main structure of the insulating part 43, is formed within the annular rib 443, and the forming dimension of the root of the boss 442 depends on the inner diameter of the annular rib 443. When L is within this inner diameter range, the structural strength of the root of the boss 442 can be ensured, and further the structural strength of the insulating part 43 during the assembly and disassembly processes can be ensured.

[0055] In some embodiments, there are two sets of the concave - convex structures 44, and the two sets of concave - convex structures 44 are arranged at intervals between the metal part 42 and the insulating part 43; and the concave - convex structures 44 are arranged staggeredly with the liquid injection holes 41. As Figure 7 and 8 shown, the two sets of concave - convex structures 44 are respectively located at both ends of the insulating seal 4. One set of the concave - convex structures 44 is arranged at intervals on the outer peripheral side of the liquid injection hole 41 to be staggered with the liquid injection hole 41 to avoid mutual interference. Specifically, each set of the concave - convex structures 44 includes multiple sets of grooves 441 and bosses 442 connected in an interlocking manner to ensure the reliability of the connection between the metal part 42 and the insulating part 43. Exemplarily, each set of the concave - convex structures 44 includes four grooves 441 and bosses 442 connected in an interlocking manner, and the four grooves 441 and bosses 442 connected in an interlocking manner are respectively distributed at the four corners of a rectangle. Among them, the spacing between two adjacent grooves 441 and bosses 442 connected in an interlocking manner is less than 6 mm to ensure the fitting tightness and structural strength between the metal part 42 and the insulating part 43.

[0056] Further, in some embodiments, an explosion-proof valve 45 is further provided on the metal part 42. The explosion-proof valve 45 is located on one side of the first through hole 411. The explosion-proof valve 45 can be a weak structure on the metal part 42. The insulating part 43 is provided with a hollow structure 46, and the hollow structure 46 is arranged corresponding to the explosion-proof valve 45. The explosion-proof valve 45 and the hollow structure 46 are provided to prevent the explosion of the battery cell due to excessive internal pressure.

[0057] Further, the electrode group 2 has electrode tabs 21. The above-mentioned electrode terminal 3 includes a pole column 31 and a connecting piece 32 that are connected. One end of the pole column 31 is exposed outside the housing 1 to conduct electric energy with external components. The connecting piece 32 is located in the accommodation cavity 11 of the housing 1. The connecting piece 32 has a first connecting part and a second connecting part that are connected. The first connecting part of the connecting piece 32 is welded to the pole column 31, and the second connecting part of the connecting piece 32 is welded to the electrode tab 21 to realize the electrical connection between the pole column 31 and the electrode tab 21. Specifically, as Figure 2 shown, the second connecting part of the connecting piece 32 is located at the opening 12. The electrode tab 21 is arranged corresponding to the second connecting part of the connecting piece 32, and at least part of the structure of the electrode tab 21 extends through the opening 12 and bends towards the second connecting part of the connecting piece 32. The second connecting part of the connecting piece 32 and the electrode tab 21 are welded through the opening 12 by welding processes such as laser welding or ultrasonic welding to realize their electrical connection.

[0058] More specifically, the electrode terminal 3 includes a positive terminal and a negative terminal. The positive terminal includes a positive pole column and a first connecting piece, and the negative terminal includes a negative pole column and a second connecting piece. That is, the above-mentioned pole column 31 includes a positive pole column and a negative pole column, and the connecting piece 32 includes a first connecting piece and a second connecting piece. Among them, the structures of the first connecting piece and the second connecting piece are the same, that is, both have the above-mentioned first connecting part and second connecting part. Correspondingly, the electrode group 2 includes a positive electrode tab and a negative electrode tab. The positive electrode tab and the second connecting part of the first connecting piece are bent and welded in the above-mentioned bending manner, and the negative electrode tab and the second connecting part of the second connecting piece are bent and welded in the above-mentioned bending manner. An opening 12 is provided on the housing 1. The positive terminal and the negative terminal are respectively located on both sides of the opening 12. The connection part between the positive electrode tab and the second connecting part of the first connecting piece is exposed through the opening 12, and the connection part between the negative electrode tab and the second connecting part of the second connecting piece is also exposed through the opening 12.

[0059] In some embodiments not shown, the first of the above-mentioned metal part 42 and insulating part 43 is the insulating part 43, and the second of the metal part 42 and insulating part 43 is the metal part 42. Specifically, the groove 441 is provided on the side of the insulating part 43 facing the metal part 42, and the above-mentioned annular rib 443 is provided at the notch of the groove 441 of the insulating part 43. A boss 442 is provided on the side of the metal part 42 facing the insulating part 43, and an annular clamping groove 444 is formed on the outer peripheral side of the boss 442. The annular rib 443 is clamped in the annular clamping groove 444. Among them, the annular rib 443 is integrally formed on the insulating part 43, and the boss 442 is integrally formed on the metal part 42.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A housing is formed with a receiving cavity and an opening is provided at one end of the housing; A pole group, arranged in the accommodating cavity; An electrode terminal is mounted on the housing; at least a portion of the structure of the electrode terminal is located in the accommodating cavity and is electrically connected to the electrode group; the opening is configured to allow the electrical connection between the electrode terminal and the electrode group to be exposed; An insulating seal is connected to the shell and blocks the opening. The insulating seal is provided with an injection hole, and the injection hole is connected to the accommodating cavity. In addition, a convex column is provided on the side of the insulating seal facing the accommodating cavity, and the convex column is located on one side of the injection hole to form a gap between the pole group and the injection hole.

2. The battery cell according to claim 1, characterized in that: There are at least two protruding columns, and at least two of the protruding columns are spaced apart around the liquid injection hole.

3. The battery cell according to claim 1, characterized in that: Along the axial direction of the injection hole, the height of the protrusion ranges from 0.3 to 5 mm, and the cross-sectional area of ​​the protrusion is greater than or equal to 0.6 mm. 2 .

4. The battery cell according to claim 1, characterized in that: The inner diameter of the injection hole is greater than or equal to 3 mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The insulating seal comprises a metal member and an insulating member injection-molded on one side of the metal member, the metal member is connected to the housing and blocks the opening, and the insulating member is located on one side of the metal member close to the accommodating cavity; The metal component is provided with a first through hole, and the insulating component is provided with a second through hole. The second through hole is arranged corresponding to the first through hole and together form the injection hole.

6. The battery cell according to claim 5, characterized in that: An annular boss is provided on one side of the insulating member facing the accommodating cavity. The annular boss is arranged around the outer side of the injection hole, and the convex column is arranged on the annular boss.

7. The battery cell according to claim 5, characterized in that: A concave-convex structure is provided between the metal part and the insulating part, and the concave-convex structure includes a groove and a boss that are interlocked and connected with each other; the groove is provided in the first one of the metal part and the insulating part, and the first one of the metal part and the insulating part has an annular rib around the notch of the groove; the boss is provided in the second one of the metal part and the insulating part, and the annular rib is clamped on the outer peripheral side of the boss.

8. The battery cell according to claim 7, characterized in that: The concave-convex structure is provided with two groups, and the two groups of the concave-convex structure are arranged between the metal component and the insulating component at intervals; and the concave-convex structure and the injection holes are arranged alternately.

9. The battery cell according to claim 5, characterized in that: The metal part is provided with an explosion-proof valve, and the explosion-proof valve is located at one side of the first through hole; the insulating part is provided with a hollow structure, and the hollow structure is arranged corresponding to the explosion-proof valve.

10. A battery pack, characterized in that: At least one battery cell according to any one of claims 1 to 9.

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