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 shell body, the inner side peripheral wall of the shell body is enclosed to form a containing cavity, and the containing cavity is suitable for containing a pole group; the inner side wall of the shell body protrudes towards the interior of the containing cavity in the wall thickness direction of the shell body to form a first limiting part, and the first limiting part is arranged at the open end of the shell body. The cover plate assembly is arranged at the open end of the shell body in a covering mode, the cover plate assembly comprises a plate body and a second limiting part connected with the plate body, and the second limiting part is suitable for being connected with the first limiting part in a clamped mode so as to limit the plate body and the shell body. According to the battery cell structure provided by the utility model, in the process that the electrode group enters the shell, the second limiting part is clamped with the first limiting part, so that the plate body and the shell body are limited, and the condition that the electrode lug is popped out of the cover plate assembly is avoided while the clearance fit between the cover plate assembly and the shell body is realized.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The lithium battery cell is a core component for the safety and assembly of the battery pack, and its structural design is crucial for the safety of the battery cell. In the existing battery cells, a cover plate and a shell body are often in clearance fit, and the tab often pops out of the cover plate during the manufacturing process. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery cell structure and a battery to solve the problem that the tab often pops out of the cover plate during the manufacturing process of the existing battery cells.

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

[0005] A shell body, the inner peripheral wall of which encloses to form a receiving cavity, and the receiving cavity is suitable for receiving a pole group;

[0006] A first limiting portion is formed by the inner side wall of the shell body protruding towards the receiving cavity along its own wall thickness direction, and the first limiting portion is arranged at the open end of the shell body;

[0007] A cover plate assembly is covered on the open end of the shell body, the cover plate assembly includes a plate body and a second limiting portion connected to the plate body, and the second limiting portion is suitable for being clamped with the first limiting portion to limit the plate body and the shell body.

[0008] Beneficial effects: In the battery cell structure provided by the utility model, the inner side wall of the shell body is provided with a first limiting portion, and the cover plate assembly is provided with a second limiting portion. During the process of the pole group entering the shell, the second limiting portion is clamped with the first limiting portion, so as to realize the limitation between the plate body and the shell body. While realizing the clearance fit between the cover plate assembly and the shell body, the situation that the tab pops out of the cover plate assembly is avoided. At the same time, it is beneficial to reduce the pressure when entering the shell and avoid extruding metal wires or metal chips during the process of entering the shell. And in the turnover process of the battery cell, through the clamping of the second limiting portion and the first limiting portion, the pole group can be prevented from moving and shifting without a clamping device, thereby improving the safety of the battery cell.

[0009] In an optional embodiment, the second limiting portion is made of an elastic material; the second limiting portion has a first state in which it keeps a fixed angle with the inner side wall of the shell body and a second state in which it is deformed under the pressure of the first limiting portion; when the pole group finishes entering the shell, the second limiting portion returns from the second state to the first state.

[0010] Beneficial effects: Before the second limiting part contacts the first limiting part, the second limiting part maintains a fixed angle with the inner side wall of the housing body. At this time, the second limiting part is in the first state; during the process of inserting into the housing, the second limiting part abuts against the first limiting part, and the second limiting part undergoes elastic deformation under the pressure of the first limiting part. At this time, the second limiting part is in the second state; until after the insertion into the housing is completed, the second limiting part is no longer under the pressure of the first limiting part, and the second limiting part returns to its initial form and is snap-fitted with the first limiting part, thereby realizing the limitation between the board body and the housing body and avoiding the situation where the tab pops out of the cover plate assembly.

[0011] In an optional embodiment, the second limiting part includes an extension part and a snap-fitting part. The snap-fitting part is arranged at one end of the extension part away from the board body along the first direction. The snap-fitting part protrudes from the extension part towards the first limiting part along its own thickness direction, and the snap-fitting part is adapted to be snap-fitted with the first limiting part.

[0012] Beneficial effects: The second limiting part realizes the connection with the components of the cover plate assembly through the extension part and is snap-fitted with the first limiting part through the snap-fitting part, thereby realizing the limitation between the board body and the housing body and avoiding the situation where the tab pops out of the cover plate assembly.

[0013] In an optional embodiment, the first limiting part and the housing body are an integrally formed structure; the housing body has a first thickness H1 before the first limiting part is formed by processing and a second thickness H2 after the first limiting part is formed by processing. The total thickness of the housing body and the first limiting part is H3. The value range of H1 is 0.35mm ≤ H1 ≤ 1mm, and / or the value range of H2 is 0.25mm ≤ H2 ≤ 0.6mm, and / or H3 satisfies H3 - H1 ≥ 0.4mm.

[0014] Beneficial effects: It can not only ensure the strength of the housing body, improve the welding strength and yield rate between the housing body and the board body, but also reduce the material cost of the housing body, which is beneficial to improving the capacity density of the battery cell. At the same time, it ensures the snap-fitting strength between the first limiting part and the second limiting part and avoids the second limiting part falling off from the first limiting part due to vibration or eccentricity.

[0015] In an optional embodiment, the snap-fitting overlapping height of the second limiting part and the first limiting part in the second direction is M, and M satisfies 0.3mm ≤ M ≤ 0.6mm.

[0016] Beneficial effects: It is not only beneficial to reducing the forming difficulty of the second limiting part and the first limiting part, but also improves the snap-fitting strength between the second limiting part and the first limiting part, thereby ensuring the effective limitation of the board body and the housing body. At the same time, it can reduce the space occupied by the second limiting part and the first limiting part in the housing body, which is beneficial to improving the volume energy density of the battery cell.

[0017] In an alternative embodiment, the cover plate assembly includes an insulating member disposed on one side of the plate body close to the electrode group along the first direction;

[0018] The second limiting portion is disposed on both sides of the insulating member in the second direction, and the second limiting portion is integrally formed with the insulating member.

[0019] Beneficial effects: The second limiting portion is integrally formed with the insulating member. At the same time, one side of the insulating member in the first direction is fixedly connected to the plate body, and the other side abuts against the electrode group. The second limiting portion is clamped with the first limiting portion to limit the displacement between the plate body and the shell body, avoiding the situation that the tab pops out of the cover plate assembly. At the same time, it is beneficial to reduce the pressure during shell insertion, avoid extruding metal wires or metal chips during shell insertion, and can avoid the movement and displacement of the electrode group without a clamping device, thereby improving the safety of the battery cell.

[0020] In an alternative embodiment, an avoidance groove is formed on the outer peripheral wall of the insulating member, and the avoidance groove is adapted to avoid the second limiting portion.

[0021] Beneficial effects: During the assembly process, the avoidance groove can avoid the second limiting portion, thereby reserving sufficient elastic deformation space for the second limiting portion, avoiding excessive extrusion of the second limiting portion, and further preventing the second limiting portion from being permanently deformed or broken, ensuring the stable and reliable clamping between the second limiting portion and the first limiting portion.

[0022] In an alternative embodiment, an insulating film is disposed between the electrode group and the shell body. The insulating film covers the outer peripheral wall of the electrode group. One side of the insulating film close to the insulating member along the first direction covers the outer peripheral wall of the insulating member and is heat-melt welded to the insulating member;

[0023] A first avoidance gap is formed at an interval between the second limiting portion and the outer side wall of the insulating member in the second direction, and the first avoidance gap is adapted to avoid the insulating film.

[0024] Beneficial effects: The first avoidance gap avoids the second limiting portion from affecting the positioning and heat melting between the insulating film and the insulating member by avoiding the insulating film.

[0025] In an alternative embodiment, the first limiting portion is disposed at an interval from the side of the insulating film away from the electrode group to form a second avoidance gap.

[0026] Beneficial effects: During the shell insertion process, a second avoidance gap is formed between the first limiting portion and the side of the insulating film away from the electrode group, thereby avoiding the first limiting portion from scratching the insulating film and / or the electrode group.

[0027] In a second aspect, the present invention further provides a battery, including: a battery body, and the battery cell structure as described above.

[0028] 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

[0029] 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.

[0030] Figure 1 Assembly drawing of a battery cell structure according to an embodiment of the present invention;

[0031] Figure 2 is Figure 1 Partial enlarged schematic view of part A in

[0032] Figure 3 is Figure 2 Partial enlarged schematic view of part B in

[0033] Figure 4 Exploded view of a battery cell structure according to an embodiment of the present invention;

[0034] Figure 5 is Figure 4 Partial enlarged schematic view of part C in

[0035] Figure 6 Front view of a cover plate assembly of a battery cell structure according to an embodiment of the present invention;

[0036] Figure 7 is Figure 6 Partial enlarged schematic view of part D in

[0037] Figure 8 is Figure 6 Cross-sectional view of the E-E section in

[0038] Figure 9 is Figure 8 Partial enlarged schematic view of part F in

[0039] Figure 10 Partial cross-sectional view of a battery cell structure according to an embodiment of the present invention when the electrode group is inserted into the housing.

[0040] Explanation of reference numerals:

[0041] 10. Housing body; 101. Accommodation cavity; 11. First limiting portion;

[0042] 20. Cover plate assembly; 21. Plate body; 22. Second limiting part; 221. Extension part; 222. Clamping part; 23. Insulating part; 231. Avoidance groove; 24. First avoidance gap; 25. Second avoidance gap;

[0043] 30. Electrode group;

[0044] 40. Insulating film. Specific embodiments

[0045] In the related art, the cell cover plate and the cell housing are usually in clearance fit, and the tab often pops out of the cover plate; while the housing and the cover plate are in interference fit, which is likely to increase the pressure during housing insertion and is also likely to cause metal wires or metal chips to be extruded during housing insertion; before pre-welding of the cell, in the cell turnover process, if the equipment does not have a clamping device, the electrode group is likely to move or shift.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] The following combines Figures 1 to 10 , to describe the embodiments of the present invention.

[0048] According to an embodiment of the present invention, on the one hand, a cell structure is provided, including:

[0049] A housing body 10, the inner peripheral wall of which encloses to form a receiving cavity 101, and the receiving cavity 101 is adapted to receive an electrode group 30;

[0050] Please refer to Figure 2 As shown, a first limiting part 11 is formed by protruding from the inner side wall of the housing body 10 toward the inside of the receiving cavity 101 along the wall thickness direction of the housing body 10, and the first limiting part 11 is arranged at the open end of the housing body 10;

[0051] A cover plate assembly 20, covering the open end of the housing body 10, the cover plate assembly 20 includes a plate body 21 and a second limiting part 22 connected to the plate body 21, the plate body 21 is in clearance fit with the housing body 10, and the second limiting part 22 is adapted to be clamped with the first limiting part 11 to limit the plate body 21 and the housing body 10.

[0052] The cell structure provided by the present utility model is such that the inner sidewall of the shell body 10 is provided with a first limiting portion 11, and the cover plate assembly 20 is provided with a second limiting portion 22. During the process of inserting the electrode group 30 into the shell, the second limiting portion 22 is engaged with the first limiting portion 11, thereby realizing the limitation between the plate body 21 and the shell body 10. While achieving the clearance fit between the cover plate assembly 20 and the shell body 10, the situation of the tab popping out of the cover plate assembly 20 is avoided. At the same time, it is beneficial to reduce the insertion pressure into the shell and avoid extruding metal wires or metal chips during the insertion process. Moreover, during the cell turnover process, through the engagement of the second limiting portion 22 and the first limiting portion 11, the electrode group can be prevented from moving or shifting without a clamping device, thereby improving the safety of the cell.

[0053] Further, the shell body 10 can be made of aluminum material; one end of the shell body 10 along the first direction can be processed by processes such as extrusion and / or stamping to form the first limiting portion 11. The process is mature, which is beneficial to realizing automated production.

[0054] Further, the second limiting portion 22 can be made of plastic material; the second limiting portion 22 can be processed by an injection molding process. The structure is simple, easy to assemble, the process is mature, and it can be mass-produced automatically.

[0055] In some embodiments, the second limiting portion 22 is made of an elastic material; the second limiting portion 22 has a first state in which it maintains a fixed angle with the inner sidewall of the shell body 10 and a second state in which it is deformed under the pressure of the first limiting portion 11; when the electrode group 30 is completely inserted into the shell, the second limiting portion 22 returns from the second state to the first state.

[0056] It should be noted that, as shown in Figure 10 Before the second limiting portion 22 contacts the first limiting portion 11, the second limiting portion 22 maintains a fixed angle with the inner sidewall of the shell body 10. For example, the second limiting portion 22 and the inner sidewall of the shell body 10 can be parallel to each other. At this time, the second limiting portion 22 is in the first state; during the insertion process, the second limiting portion 22 abuts against the first limiting portion 11, and the second limiting portion 22 undergoes elastic deformation under the pressure of the first limiting portion 11. At this time, the second limiting portion 22 is in the second state; until the insertion is completed, the second limiting portion 22 is no longer under the pressure of the first limiting portion 11, and the second limiting portion 22 returns to its initial form and is engaged with the first limiting portion 11, thereby realizing the limitation between the plate body 21 and the shell body 10 and avoiding the situation of the tab popping out of the cover plate assembly 20.

[0057] In some embodiments, as shown in Figure 2As shown, the second limiting portion 22 includes an extension portion 221 and a clamping portion 222. The clamping portion 222 is disposed at one end of the extension portion 221 away from the plate body 21 along the first direction. The clamping portion 222 protrudes from the extension portion 221 in the direction of the first limiting portion 11 along its own thickness direction, and the clamping portion 222 is adapted to be clamped with the first limiting portion 11.

[0058] It should be noted that the extension portion 221 can be fixedly connected to the plate body 21, or the extension portion 221 can be fixedly connected to the end plate, or the extension portion 221 can also be fixedly connected to the lower plastic, which can be adjusted according to the actual structure of the battery cell.

[0059] In this embodiment, the second limiting portion 22 realizes the connection with the components of the cover plate assembly 20 through the extension portion 221, and is clamped with the first limiting portion 11 through the clamping portion 222, so as to realize the limitation between the plate body 21 and the shell body 10, and avoid the situation that the tab pops out of the cover plate assembly 20.

[0060] It can be understood that, please refer to Figure 3 As shown, smooth guiding portions (not shown in the figure) are provided on one side of the first limiting portion 11 and the second limiting portion 22 along the first direction. During the assembly process, the guiding portion of the first limiting portion 11 smoothly transitions with the guiding portion of the second limiting portion 22, which is beneficial to reducing the resistance during shell insertion.

[0061] In some embodiments, the first limiting portion 11 and the shell body 10 are of an integrally formed structure; please refer to Figure 3 As shown, the shell body 10 has a first thickness H1 before the first limiting portion 11 is formed by extrusion and / or stamping, and a second thickness H2 after the first limiting portion 11 is formed by extrusion and / or stamping. The total thickness of the shell body 10 and the first limiting portion 11 is H3. The value range of H1 is 0.35 mm ≤ H1 ≤ 1 mm, and / or the value range of H2 is 0.25 mm ≤ H2 ≤ 0.6 mm, and / or H3 satisfies H3 - H1 ≥ 0.4 mm.

[0062] It should be noted that the thickness of the shell body 10 before extrusion and / or stamping is H1. H1 cannot be too small, otherwise it is easy to cause insufficient strength of the shell body 10. Therefore, H1 needs to satisfy H1≥0.35mm; H1 cannot be too large, otherwise it is easy to increase the material cost of the shell body 10 and affect the capacity density of the battery cell. Therefore, H1 also needs to satisfy H1≤1mm. The thickness of the shell body 10 after extrusion and / or stamping is H2. H2 cannot be too small, otherwise it is not only easy to cause insufficient strength of the shell body 10, but also affects the welding strength and yield rate between the shell body 10 and the plate body 21. Therefore, H2 needs to satisfy H2≥0.25mm; the maximum value of H2 depends on the maximum value of H1, and the maximum value of H2 can be taken as 0.6mm; since the second limiting portion 22 is made of an elastic material, the second limiting portion 22 is likely to fall off from the first limiting portion 11 due to vibration and eccentricity. Therefore, the protruding height of the first limiting portion 11 cannot be too small, otherwise it is easy to cause a decrease in the clamping strength between the first limiting portion 11 and the second limiting portion 22. Therefore, it also needs to satisfy H3−H1≥0.4mm.

[0063] In this embodiment, by satisfying 0.35mm≤H1≤1mm, and / or, 0.25mm≤H2≤0.6mm, and / or, H3−H1≥0.4mm for H1, H2, and H3, it is possible to not only ensure the strength of the shell body 10, improve the welding strength and yield rate between the shell body 10 and the plate body 21, but also reduce the material cost of the shell body 10, which is beneficial to improving the capacity density of the battery cell. At the same time, it can ensure the clamping strength between the first limiting portion 11 and the second limiting portion 22, and prevent the second limiting portion 22 from falling off from the first limiting portion 11 due to vibration and eccentricity.

[0064] In some embodiments, please refer to Figure 3 As shown, the clamping overlap height M of the second limiting portion 22 and the first limiting portion 11 in the second direction satisfies 0.3mm≤M≤0.6mm.

[0065] It should be noted that if the clamping overlap height M of the second limiting portion 22 and the first limiting portion 11 in the second direction is too small, it is not only easy to increase the forming difficulty of the second limiting portion 22 and the first limiting portion 11, but also easy to reduce the clamping strength between the second limiting portion 22 and the first limiting portion 11, and it is impossible to ensure the effective limiting of the plate body 21 and the shell body 10. Therefore, M needs to satisfy M≥0.3mm; if the clamping overlap height M of the second limiting portion 22 and the first limiting portion 11 in the second direction is too large, it is easy to increase the space occupied by the second limiting portion 22 and the first limiting portion 11 in the shell body 10, affecting the volume energy density of the battery cell. Therefore, M also needs to satisfy M≤0.6mm.

[0066] In this embodiment, the overlapping height M of the second limiting portion 22 and the first limiting portion 11 in the second direction satisfies 0.3 mm ≤ M ≤ 0.6 mm, which is beneficial to reducing the forming difficulty of the second limiting portion 22 and the first limiting portion 11, while improving the clamping strength between the second limiting portion 22 and the first limiting portion 11, thereby ensuring the effective limitation of the plate body 21 and the shell body 10, and reducing the space occupied by the second limiting portion 22 and the first limiting portion 11 in the shell body 10, which is beneficial to improving the volume energy density of the battery cell.

[0067] In some embodiments, please refer to Figure 2 As shown, the cover plate assembly 20 includes an insulating member 23, and the insulating member 23 is fixedly arranged on one side of the plate body 21 close to the electrode group 30 along the first direction;

[0068] The second limiting portions 22 are arranged on both sides of the insulating member 23 in the second direction, and the second limiting portions 22 and the insulating member 23 are integrally formed.

[0069] In this embodiment, the second limiting portion 22 and the insulating member 23 are integrally formed. At the same time, one side of the insulating member 23 in the first direction is fixedly connected to the plate body 21, and the other side abuts against the electrode group 30. The second limiting portion 22 is clamped with the first limiting portion 11 to limit the displacement between the plate body 21 and the shell body 10, avoiding the situation that the pole ear pops out of the cover plate assembly 20. At the same time, it is beneficial to reduce the shelling pressure, avoid extruding metal wires or metal chips during the shelling process, and prevent the electrode group from moving or shifting without a clamping device, thereby improving the safety of the battery cell.

[0070] Furthermore, the insulating member 23 can be made of plastic material.

[0071] In some embodiments, please refer to Figure 7 As shown, an avoidance groove 231 is formed on the outer peripheral wall of the insulating member 23, and the avoidance groove 231 is adapted to avoid the second limiting portion 22.

[0072] In this embodiment, by forming the avoidance groove 231 corresponding to the second limiting portion 22 on the insulating member 23, during the assembly process, the second limiting portion 22 can be avoided through the avoidance groove 231, thereby reserving enough elastic deformation space for the second limiting portion 22, avoiding excessive extrusion of the second limiting portion 22, and preventing the second limiting portion 22 from generating permanent deformation or breakage, ensuring the stable and reliable clamping between the second limiting portion 22 and the first limiting portion 11.

[0073] In some embodiments, please refer to Figure 3As shown, an insulating film 40 is provided between the electrode group 30 and the housing body 10. The insulating film 40 covers the outer peripheral wall of the electrode group 30, and the insulating film 40 covers the outer peripheral wall of the insulating member 23 on the side close to the insulating member 23 in the first direction and is heat-melt welded to the insulating member 23.

[0074] Please also refer to Figure 9 As shown, a first avoidance gap 24 is formed at an interval between the second limiting portion 22 and the outer side wall of the insulating member 23 in the second direction. The first avoidance gap 24 is adapted to avoid the insulating film 40, so as to prevent the second limiting portion 22 from affecting the positioning and heat melting between the insulating film 40 and the insulating member 23.

[0075] Furthermore, please also refer to Figure 5 and Figure 7 As shown, the width of the second limiting portion 22 in the third direction is smaller than the width of the insulating member 23 in the third direction, so as to reserve positioning and heat melting space between the insulating film 40 and the insulating member 23.

[0076] In some embodiments, please refer to Figure 10 As shown, the first limiting portion 11 is arranged at an interval from the side of the insulating film 40 away from the electrode group 30 to form a second avoidance gap 25.

[0077] In this embodiment, during the process of inserting into the housing, the first limiting portion 11 and the side of the insulating film 40 away from the electrode group 30 form a second avoidance gap 25, so as to prevent the first limiting portion 11 from scratching the insulating film 40 and / or the electrode group 30.

[0078] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: a battery body, and the electrode core structure as described above.

[0079] 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.

[0080] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell structure, characterized in that: include: The shell body has an inner peripheral wall enclosing a receiving cavity, and the receiving cavity is suitable for receiving the pole group; The inner side wall of the shell body protrudes toward the accommodating cavity along its own wall thickness direction to form a first limiting portion, and the first limiting portion is arranged at the open end of the shell body; A cover plate assembly is arranged on the open end of the shell body, and the cover plate assembly includes a plate body and a second limiting portion connected to the plate body, wherein the second limiting portion is suitable for being engaged with the first limiting portion to limit the plate body and the shell body.

2. The battery cell structure according to claim 1, characterized in that: The second limiting portion is made of elastic material; the second limiting portion has a first state in which it maintains a fixed angle with the inner wall of the shell body and a second state in which it is deformed by the pressure of the first limiting portion; when the pole group is completely inserted into the shell, the second limiting portion returns to the first state from the second state.

3. The battery cell structure according to claim 2, characterized in that: The second limiting portion includes an extension portion and a clamping portion. The clamping portion is arranged at one end of the extension portion away from the plate body along the first direction. The clamping portion is formed by the extension portion protruding along its own thickness direction toward the direction close to the first limiting portion. The clamping portion is suitable for clamping with the first limiting portion.

4. The battery cell structure according to claim 1, characterized in that: The first limiting portion and the shell body are an integrally formed structure; the shell body has a first thickness H1 before the first limiting portion is formed and a second thickness H2 after the first limiting portion is formed, and the total thickness of the shell body and the first limiting portion is H3; The value range of H1 is 0.35mm≤H1≤1mm, and / or the value range of H2 is 0.25mm≤H2≤0.6mm, and / or H3 satisfies H3-H1≥0.4mm.

5. The battery cell structure according to claim 4, characterized in that: The overlapping height of the second limiting portion and the first limiting portion in the second direction is M, and M satisfies 0.3 mm ≤ M ≤ 0.6 mm.

6. The battery core structure according to any one of claims 1 to 5, characterized in that: The cover plate assembly includes an insulating member, and the insulating member is arranged on a side of the plate body close to the pole group along the first direction; The second limiting portion is disposed on both sides of the insulating member in the second direction, and the second limiting portion is integrally formed with the insulating member.

7. The battery cell structure according to claim 6, characterized in that: An escape groove is provided on the outer peripheral wall of the insulating member, and the escape groove is suitable for escaping the second limiting portion.

8. The battery cell structure according to claim 6, characterized in that: An insulating film is provided between the pole group and the shell body, the insulating film is coated on the outer peripheral wall of the pole group, and the insulating film is coated on the outer peripheral wall of the insulating member on one side close to the insulating member along the first direction and is hot-melt welded to the insulating member; A first avoidance gap is formed between the second limiting portion and the outer side wall of the insulating member along the second direction, and the first avoidance gap is suitable for avoiding the insulating film.

9. The battery cell structure according to claim 8, characterized in that: The first limiting portion is spaced apart from a side of the insulating film away from the electrode group to form a second avoidance gap.

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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