Battery cell structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell structure and a battery, the battery cell structure comprises: a pole group, which comprises two first side surfaces oppositely arranged along the width direction and two second side surfaces oppositely arranged along the thickness direction; the side plate is arranged on at least one first side surface; the insulating film is provided with two first indentations, the two first indentations are oppositely arranged in a spaced mode and form a first wrapping face, and the first wrapping face is suitable for wrapping the first side face; the insulating film is further provided with two second indentations, each second indentation and the corresponding first indentation are oppositely arranged in a spaced mode and form a second wrapping face, and the second wrapping faces are suitable for wrapping the second side faces; the distance between the second indentation and the first indentation is B, B satisfies B-H-K-2 * T < = 3mm, H is the width of the pole group, K is the total thickness of the side plate, and T is the thickness of the insulating film. According to the battery cell structure provided by the utility model, the resistance of the pole group entering the shell is reduced, and the damage risk of the insulating film is reduced.

Description

Technical Field

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

[0002] The process of wrapping the insulating film around the electrode assembly is a very important step in the battery manufacturing process, which plays a key role in ensuring the quality and safety of the battery. By wrapping the insulating film around the electrode assembly structure, the electrode assembly is protected to prevent internal short circuit of the cell. However, in the cell manufacturing process, due to the loose wrapping of the insulating film, the resistance of the electrode assembly to enter the case is relatively large, and there is a risk of damage to the insulating film. Summary of the Utility Model

[0003] In view of this, the utility model provides a cell structure and a battery to solve the problems that in the cell manufacturing process, due to the loose wrapping of the insulating film, the resistance of the electrode assembly to enter the case is relatively large, and there is a risk of damage to the insulating film.

[0004] In a first aspect, the utility model provides a cell structure, including:

[0005] An electrode assembly, including two first side surfaces oppositely arranged in the width direction and two second side surfaces oppositely arranged in the thickness direction;

[0006] Side plates, arranged on at least one of the first side surfaces;

[0007] An insulating film, on which two first indentations are arranged along the length direction, the two first indentations are relatively spaced apart and form a first covering surface, and the first covering surface is adapted to cover the first side surface;

[0008] Two second indentations are further arranged on the insulating film along the length direction, each second indentation is relatively spaced apart from the first indentation and forms a second covering surface, and the second covering surface is adapted to cover the second side surface;

[0009] The distance between the second indentation and the first indentation is B, and B satisfies B - H - K - 2×T ≤ 3 mm, where H is the width of the electrode assembly, K is the total thickness of the side plates, and T is the thickness of the insulating film.

[0010] Beneficial effects: In the cell structure provided by the utility model, the distance between the second indentation and the first indentation on the insulating film satisfies B - H - K - 2×T ≤ 3 mm, where H is the width of the electrode assembly, K is the total thickness of the side plates, and T is the thickness of the insulating film, so that the first covering surface closely adheres to the first side surface, and at the same time the second covering surface closely adheres to the second side surface, ensuring the compactness of the insulating film wrapped around the electrode assembly, reducing the resistance of the electrode assembly to enter the case, and at the same time reducing the risk of damage to the insulating film.

[0011] In an optional embodiment, the distance B between the second indentation and the first indentation further satisfies B - H - K - 2×T ≥ 0.5 mm.

[0012] Beneficial effects: The distance B between the second indentation and the first indentation further satisfies B - H - K - 2×T ≥ 0.5 mm, which not only ensures the compactness of the insulating film wrapping the electrode group, reduces the resistance of the electrode group to enter the shell, but also reduces the risk of damage to the insulating film. At the same time, it can avoid the insulating film from pressing and damaging the electrode plate, and reduces the risk of the electrode group moving in the cell housing.

[0013] In an alternative embodiment, the distance between the two first indentations is C, and C satisfies C = L, where L is the thickness of the electrode group.

[0014] Beneficial effects: It not only ensures the compactness of the insulating film wrapping the electrode group, reduces the resistance of the electrode group to enter the shell, but also reduces the risk of damage to the insulating film. At the same time, it can avoid the actual crease of the insulating film from being received on the narrow side, prevent the end tape from bursting, and avoid affecting the insertion of the electrode group into the shell.

[0015] In an alternative embodiment, a third wrapping surface is formed between the side of the second indentation away from the second wrapping surface and the edge of the insulating film, and the third wrapping surface is suitable for wrapping the first side surface;

[0016] The distance between the second indentation and the edge of the insulating film is D, and D satisfies C / 2 < D ≤ C.

[0017] Beneficial effects: It can not only avoid the insulating film from exceeding the surface of the electrode group during the end wrapping, but also avoid the actual crease of the insulating film from being received on the narrow side, prevent the end tape from bursting, thereby avoiding affecting the insertion of the electrode group into the shell.

[0018] In an alternative embodiment, the distance D between the second indentation and the edge of the insulating film further satisfies 0 ≤ L - D ≤ 2 mm.

[0019] Beneficial effects: Thus, it can effectively avoid the insulating film from exceeding the surface of the electrode group during the end wrapping of the insulating film, and avoid affecting the insertion of the electrode group into the shell.

[0020] In an alternative embodiment, the cell structure further includes:

[0021] A housing, the inner peripheral wall of which is suitable for enclosing to form a receiving cavity, and the receiving cavity is suitable for receiving the electrode group, and the insulating film is suitable for insulating between the electrode group and the inner wall of the housing;

[0022] A first cover assembly, covering one side in the length direction of the housing;

[0023] A second cover assembly, covering the other side in the length direction of the housing, and the second cover assembly, the first cover assembly and the side plate are suitable for jointly fixing the electrode group in the receiving cavity.

[0024] Beneficial effects: By wrapping the pole group and the side plate with an insulating film, insulation is achieved between the pole group and the inner wall of the housing, thereby avoiding internal short - circuit of the battery cell caused by the overlap between the pole group and the inner wall of the housing.

[0025] In an alternative embodiment, the first cover assembly includes a first plate body and a first insulating member. The first plate body is adapted to be welded to one side of the housing in the length direction. One side of the first insulating member in the length direction abuts against the first plate body, and the other side is adapted to abut against the pole group.

[0026] The second cover assembly includes a second plate body, a second insulating member, and an end plate. The second plate body is adapted to be welded to the other side of the housing in the length direction. The second insulating member is disposed between the second plate body and the end plate. The end plate abuts against the second insulating member, and the side of the end plate away from the second insulating member is adapted to abut against the pole group.

[0027] Beneficial effects: By abutting the first insulating member against one side of the pole group in the length direction and abutting the end plate against the other side of the pole group in the length direction, the pole group is prevented from moving around in the housing.

[0028] In an alternative embodiment, the side of the first plate body away from the pole group in the length direction is the first end face, and the side of the second plate body away from the pole group in the length direction is the second end face; the side of the first plate body close to the pole group in the length direction is the third end face, and the side of the second plate body close to the pole group in the length direction is the fourth end face; the side of the second insulating member away from the second plate body in the length direction is the fifth end face.

[0029] The length of the insulating film is A, and A satisfies A = W - E - F - G - P - Q, where W is the distance between the first end face and the second end face in the length direction, E is the thickness of the first plate body, F is the thickness of the second plate body, G is the thickness of the second insulating member, P is the distance between one side of the insulating film in the length direction and the third end face, P satisfies P≥1mm, Q is the distance between the other side of the insulating film in the length direction and the fifth end face, and Q satisfies Q≥1mm.

[0030] Beneficial effects: Thus, it is avoided that the insulating film is inserted into the gap between the first plate body and / or the second plate body and the housing, ensuring that the visual inspection system accurately detects the heat melting point and avoiding peripheral welding explosion points.

[0031] In an alternative embodiment, P also satisfies P≤3mm, and Q also satisfies Q≤3mm.

[0032] Beneficial effects: It can not only ensure that the visual inspection system accurately detects the heat melting point and avoid peripheral welding explosion points, but also ensure a sufficient heat melting area and avoid excessive compression of the pole group separator.

[0033] In a second aspect, the present utility model also provides a battery, including: a battery body, and the battery cell structure as described above.

[0034] Beneficial effects: The battery of the second aspect includes the battery cell structure of the first aspect. Therefore, the battery of the second aspect includes all the beneficial effects of the battery cell structure of the first aspect. Description of the Drawings

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is an assembly schematic diagram of a battery cell structure according to an embodiment of the present invention;

[0037] Figure 2 It is an unfolded schematic diagram of an insulating film of a battery cell structure according to an embodiment of the present invention;

[0038] Figure 3 It is an assembly schematic diagram of a pole group and a side plate of a battery cell structure according to an embodiment of the present invention;

[0039] Figure 4 It is an overall schematic diagram of a battery according to an embodiment of the present invention.

[0040] Description of the Reference Numerals:

[0041] 10. Pole group; 101. First side; 102. Second side;

[0042] 20. Side plate;

[0043] 30. Insulating film; 301. First covering surface; 302. Second covering surface; 303. Third covering surface; 31. First indentation; 32. Second indentation;

[0044] 40. Housing;

[0045] 50. First cover assembly; 51. First plate body; 511. First end face; 512. Third end face; 52. First insulating member;

[0046] 60. Second cover assembly; 61. Second plate body; 611. Second end face; 612. Fourth end face; 62. Second insulating member; 621. Fifth end face; 63. End plate. Detailed Embodiments

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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 of ordinary skill 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.

[0048] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 4 , to describe the embodiments of the present utility model.

[0049] According to an embodiment of the present utility model, on the one hand, a battery cell structure is provided, including:

[0050] A pole group 10, including two first side surfaces 101 oppositely arranged in the width direction and two second side surfaces 102 oppositely arranged in the thickness direction;

[0051] A side plate 20, arranged on at least one of the first side surfaces 101;

[0052] An insulating film 30, on which two first indentations 31 are arranged along the length direction, the two first indentations 31 are relatively spaced apart to form a first covering surface 301, and the first covering surface 301 is adapted to cover the first side surface 101;

[0053] Two second indentations 32 are further arranged on the insulating film 30 along the length direction, each second indentation 32 is relatively spaced apart from the first indentation 31 to form a second covering surface 302, and the second covering surface 302 is adapted to cover the second side surface 102;

[0054] The distance between the second indentation 32 and the first indentation 31 is B, and B satisfies B - H - K - 2×T ≤ 3 mm, where H is the width of the pole group 10, K is the total thickness of the side plate 20, and T is the thickness of the insulating film 30.

[0055] It should be noted that the pole group 10 in this embodiment refers to the pole group after hot pressing. The side plate 20 can be arranged on one of the first side surfaces 101 of the pole group 10. At this time, K is the thickness of a single side plate 20; it can also be arranged on the two first side surfaces 101 of the pole group 10. At this time, K is the total thickness of the two side plates 20. In the manufacturing process, the first indentation 31 and the second indentation 32 can be pre-set on the insulating film 30. When wrapping the insulating film, the insulating film 30 can be folded along the first indentation 31 and the second indentation 32 so that the insulating film 30 wraps around the pole group 10 and the side plate 20.

[0056] For the cell structure provided by the present utility model, the distance between the second indentation 32 and the first indentation 31 on the insulating film 30 satisfies B - H - K - 2×T ≤ 3 mm, where H is the width of the electrode assembly 10, K is the total thickness of the side plate 20, and T is the thickness of the insulating film 30, so that the first covering surface 301 closely adheres to the first side surface 101, and at the same time the second covering surface 302 closely adheres to the second side surface 102, ensuring the compactness of the insulating film 30 surrounding the electrode assembly 10, reducing the resistance of the electrode assembly entering the case, and at the same time reducing the risk of damage to the insulating film.

[0057] In some embodiments, the distance B between the second indentation 32 and the first indentation 31 also satisfies B - H - K - 2×T ≥ 0.5 mm.

[0058] It should be noted that the distance B between the second indentation 32 and the first indentation 31 cannot be too small, otherwise it is easy to cause the second covering surface 302 to be too narrow, resulting in excessive shrinkage of the insulating film 30 during the covering process. Not only is there a risk of the insulating film 30 pressing on the electrode tab, but also the risk of the electrode assembly 10 moving around in the cell case is increased. Therefore, the distance B between the second indentation 32 and the first indentation 31 also needs to satisfy B - H - K - 2×T ≥ 0.5 mm.

[0059] In this embodiment, the distance B between the second indentation 32 and the first indentation 31 further satisfies B - H - K - 2×T ≥ 0.5 mm, which not only ensures the compactness of the insulating film 30 surrounding the electrode assembly 10, reduces the resistance of the electrode assembly entering the case, and at the same time reduces the risk of damage to the insulating film, but also can avoid the insulating film 30 pressing on the electrode tab and reduce the risk of the electrode assembly 10 moving around in the cell case.

[0060] In some embodiments, please refer to Figure 2 As shown, the distance between the two first indentations 31 is C, and C satisfies C = L, where L is the thickness of the electrode assembly 10.

[0061] It should be noted that the electrode assembly 10 in this embodiment refers to the electrode assembly after hot pressing. Therefore, L is the thickness of the electrode assembly 10 after hot pressing. The distance C between the two first indentations 31 cannot be too large, otherwise it is easy to cause the insulating film to be loose, resulting in a large resistance for the electrode assembly to enter the case and a risk of damage to the insulating film; at the same time, the distance C between the two first indentations 31 cannot be too small, otherwise it is easy to cause the actual crease of the insulating film 30 to be folded on the narrow side during the process of covering the insulating film, resulting in an increase in the arc angle of the insulating film 30 and causing the end tape to burst, affecting the entry of the electrode assembly into the case. Therefore, the distance C between the two first indentations 31 needs to satisfy C = L, where L is the thickness of the electrode assembly 10.

[0062] In this embodiment, the distance C between the two first indentations 31 satisfies C = L, where L is the thickness of the electrode group 10. This not only ensures the compactness of the insulating film wrapping the electrode group, reduces the resistance of the electrode group to enter the housing, but also reduces the risk of damage to the insulating film. At the same time, it can prevent the actual crease of the insulating film 30 from being folded on the narrow side, prevent the end tape from bursting, and avoid affecting the insertion of the electrode group into the housing.

[0063] In some embodiments, as shown in Figure 2 a third wrapping surface 303 is formed between the side of the second indentation 32 away from the second wrapping surface 302 and the edge of the insulating film 30. The third wrapping surface 303 is adapted to wrap the first side surface 101.

[0064] The distance between the second indentation 32 and the edge of the insulating film 30 is D, and D satisfies C / 2 < D ≤ C.

[0065] It should be noted that if the third wrapping surface 303 is too wide, it may exceed the surface of the electrode group 10 when wrapping the insulating film, affecting the insertion of the electrode group into the housing. Therefore, the distance D between the second indentation 32 and the edge of the insulating film 30 needs to satisfy D ≤ C. If the third wrapping surface 303 is too narrow, the actual crease of the insulating film 30 is folded on the narrow side, resulting in an increase in the arc angle of the insulating film 30 and causing the end tape to burst, affecting the insertion of the electrode group into the housing. Therefore, the distance D between the second indentation 32 and the edge of the insulating film 30 also needs to satisfy D > C / 2.

[0066] In this embodiment, the distance D between the second indentation 32 and the edge of the insulating film 30 satisfies C / 2 < D ≤ C, which can not only prevent the insulating film from exceeding the surface of the electrode group 10 when finishing wrapping, but also prevent the actual crease of the insulating film 30 from being folded on the narrow side, prevent the end tape from bursting, and thus avoid affecting the insertion of the electrode group into the housing.

[0067] In some embodiments, the distance D between the second indentation 32 and the edge of the insulating film 30 also satisfies 0 ≤ L - D ≤ 2 mm, so as to effectively prevent the insulating film from exceeding the surface of the electrode group 10 when finishing wrapping and avoid affecting the insertion of the electrode group into the housing.

[0068] In some embodiments, as shown in Figure 1 the battery cell structure further includes:

[0069] a housing 40, the inner peripheral wall of which is adapted to enclose and form a receiving cavity, and the receiving cavity is adapted to receive the electrode group 10. The insulating film 30 is adapted to insulate between the electrode group 10 and the inner wall of the housing 40.

[0070] a first cover assembly 50, which is covered on one side in the length direction of the housing 40.

[0071] The second cover plate assembly 60 is disposed on the other side in the length direction of the housing 40. The second cover plate assembly 60, the first cover plate assembly 50, and the side plate 20 are adapted to jointly fix the electrode group 10 in the accommodation cavity.

[0072] In this embodiment, the electrode group 10 and the side plate 20 are wrapped by the insulating film 30, thereby insulating between the electrode group 10 and the inner wall of the housing 40, and avoiding internal short circuit of the battery cell caused by the overlap between the electrode group 10 and the inner wall of the housing 40.

[0073] In some embodiments, please refer to Figure 1 As shown, the first cover plate assembly 50 includes a first plate body 51 and a first insulating member 52. The first plate body 51 is adapted to be welded to one side in the length direction of the housing 40. One side in the length direction of the first insulating member 52 abuts against the first plate body 51, and the other side is adapted to abut against the electrode group 10.

[0074] The second cover plate assembly 60 includes a second plate body 61, a second insulating member 62, and an end plate 63. The second plate body 61 is adapted to be welded to the other side in the length direction of the housing 40. The second insulating member 62 is disposed between the second plate body 61 and the end plate 63. The end plate 63 abuts against the second insulating member 62, and the side of the end plate 63 away from the second insulating member 62 is adapted to abut against the electrode group 10.

[0075] In this embodiment, by abutting the first insulating member 52 against one side in the length direction of the electrode group 10 and abutting the end plate 63 against the other side in the length direction of the electrode group 10, the electrode group 10 is prevented from moving around in the housing 40.

[0076] In some embodiments, please refer to Figure 1 As shown, the side of the first plate body 51 away from the electrode group 10 in the length direction is the first end face 511, and the side of the second plate body 61 away from the electrode group 10 in the length direction is the second end face 611; the side of the first plate body 51 close to the electrode group 10 in the length direction is the third end face 512, and the side of the second plate body 61 close to the electrode group 10 in the length direction is the fourth end face 612; the side of the second insulating member 62 away from the second plate body 61 in the length direction is the fifth end face 621.

[0077] The length of the insulating film 30 is A, and A satisfies A = W - E - F - G - P - Q, where W is the distance between the first end face 511 and the second end face 611 in the length direction, E is the thickness of the first plate body 51, F is the thickness of the second plate body 61, G is the thickness of the second insulating member 62, P is the distance between one side of the insulating film 30 in the length direction and the third end face 512, P satisfies P≥1mm, and Q is the distance between the other side of the insulating film 30 in the length direction and the fifth end face 621, Q satisfies Q≥1mm.

[0078] It should be noted that if the insulating film 30 is too long, it is easy for the insulating film 30 to be inserted into the gap between the first plate body 51 and / or the second plate body 61 and the housing 40. This not only easily causes the vision inspection system to be unable to detect the thermal melting point, but also easily causes peripheral soldering explosion points. Therefore, the length A of the insulating film 30 needs to satisfy A = W - E - F - G - P - Q, and P satisfies P≥1mm, Q satisfies Q≥1mm, so as to prevent the insulating film 30 from being inserted into the gap between the first plate body 51 and / or the second plate body 61 and the housing 40, ensure that the vision inspection system accurately detects the thermal melting point, and avoid peripheral soldering explosion points.

[0079] In some embodiments, P also satisfies P≤3mm, and Q also satisfies Q≤3mm.

[0080] It should be noted that if the insulating film 30 is too short, it not only easily causes insufficient thermal melting area, but also easily causes excessive compression of the separator of the electrode group after thermal melting. Therefore, the length A of the insulating film 30 also needs to satisfy A = W - E - F - G - P - Q, and P≤3mm, Q≤3mm.

[0081] In this embodiment, the length A of the insulating film 30 by satisfying A = W - E - F - G - P - Q, and 1mm≤P≤3mm, 1mm≤Q≤3mm, can not only ensure that the vision inspection system accurately detects the thermal melting point and avoid peripheral soldering explosion points, but also ensure sufficient thermal melting area and avoid excessive compression of the separator of the electrode group.

[0082] According to an embodiment of the present invention, on the other hand, a battery is also provided, including: a battery body, and the electrode core structure as described above.

[0083] The battery in this embodiment includes the above-mentioned electrode core structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned electrode core structure.

[0084] Figure 4 Exemplarily, an overall schematic diagram of a battery according to an embodiment of the present invention is given. The dimensions of the battery satisfy: the value range of the battery length is 300mm - 20000mm, the value range of the battery thickness is 10mm - 30mm, and the value range of the battery width is 60mm - 150mm.

[0085] By adopting the above-mentioned electrode core structure, on the one hand, the resistance of the electrode group entering the housing is reduced, the risk of damage to the insulating film is reduced, on the other hand, the damage to the electrode sheet is avoided, the risk of the electrode group moving in the housing is reduced, and on the third hand, sufficient thermal melting area can be ensured to avoid peripheral soldering explosion points.

[0086] Although 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 fall within the scope defined by the appended claims.

Claims

1. A battery cell structure, characterized in that: include: The pole group comprises two first side surfaces arranged opposite to each other in the width direction and two second side surfaces arranged opposite to each other in the thickness direction; a side panel disposed on at least one of the first side surfaces; An insulating film, on which two first indentations are arranged along the length direction, the two first indentations are arranged relatively and spaced apart to form a first covering surface, and the first covering surface is suitable for covering the first side surface; Two second indentations are also arranged on the insulating film along the length direction, each of the second indentations is arranged relative to the first indentation and spaced apart to form a second covering surface, and the second covering surface is suitable for covering the second side surface; The distance between the second indentation and the first indentation is B, and B satisfies B-H-K-2×T≤3mm, wherein H is the width of the pole group, K is the total thickness of the side plate, and T is the thickness of the insulating film.

2. The battery cell structure according to claim 1, characterized in that: The distance B between the second indentation and the first indentation also satisfies B-H-K-2×T≥0.5 mm.

3. The battery cell structure according to claim 1, characterized in that: The distance between the two first indentations is C, and C satisfies C=L, where L is the thickness of the pole group.

4. The battery cell structure according to claim 3, characterized in that: A third covering surface is formed between a side of the second indentation away from the second covering surface and an edge of the insulating film, and the third covering surface is suitable for covering the first side surface; The distance between the second indentation and the edge of the insulating film is D, and D satisfies C / 2<D≤C.

5. The battery cell structure according to claim 4, characterized in that: The distance D between the second indentation and the edge of the insulating film also satisfies 0≤L-D≤2 mm.

6. The battery core structure according to any one of claims 1 to 5, characterized in that: The battery cell structure also includes: A shell, whose inner peripheral wall is suitable for enclosing and forming a receiving cavity, the receiving cavity is suitable for receiving the electrode group, and the insulating film is suitable for insulating the electrode group from the inner wall of the shell; A first cover plate assembly, which is disposed on one side of the housing in the length direction; The second cover plate assembly is arranged on the other side of the shell in the length direction. The second cover plate assembly, the first cover plate assembly and the side plate are suitable for jointly fixing the pole group in the accommodating cavity.

7. The battery cell structure according to claim 6, characterized in that: The first cover plate assembly comprises a first plate body and a first insulating member, wherein the first plate body is suitable for being welded to one side of the shell in the length direction, and one side of the first insulating member in the length direction abuts against the first plate body, and the other side is suitable for abutting against the pole group; The second cover plate assembly includes a second plate body, a second insulating member and an end plate. The second plate body is suitable for welding to the other side of the shell in the length direction. The second insulating member is arranged between the second plate body and the end plate. The end plate abuts against the second insulating member. The side of the end plate away from the second insulating member is suitable for abutting against the pole group.

8. The battery cell structure according to claim 7, characterized in that: The side of the first plate away from the pole group along the length direction is a first end face, and the side of the second plate away from the pole group along the length direction is a second end face; the side of the first plate close to the pole group along the length direction is a third end face, and the side of the second plate close to the pole group along the length direction is a fourth end face; the side of the second insulating member away from the second plate along the length direction is a fifth end face; The length of the insulating film is A, and A satisfies A=W-E-F-G-P-Q, wherein W is the distance between the first end face and the second end face along the length direction, E is the thickness of the first plate body, F is the thickness of the second plate body, G is the thickness of the second insulating member, P is the distance between one side of the insulating film along the length direction and the third end face, and P satisfies P≥1mm, and Q is the distance between the other side of the insulating film along the length direction and the fifth end face, and Q satisfies Q≥1mm.

9. The battery cell structure according to claim 8, characterized in that: P also satisfies P≤3mm, and Q also satisfies Q≤3mm.

10. A battery, characterized in that: include: A battery body, and a battery core structure as claimed in any one of claims 1 to 9.

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