Battery cell, battery pack and vehicle

Abstract

The utility model discloses a battery monomer, a battery pack and a vehicle, the battery monomer comprises: a pole core, which is formed by winding; the current collecting disc is connected with the pole core, and the supporting piece is supported between the pole core and the current collecting disc. According to the single battery disclosed by the utility model, the supporting piece is arranged between the pole core and the current collecting plate, so that on one hand, the supporting piece can support the current collecting plate in an area with fewer tabs or an area without tabs on the pole core, and the probability of insufficient soldering or infirm welding of the current collecting plate and the pole column is reduced; the supporting piece can block heat transferred towards the pole core in the welding process of the current collecting disc and the pole column, the probability that a diaphragm in the pole core is damaged is reduced, and therefore the reliability of the single battery in the working process can be improved.

Description

Technical Field

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

[0002] In a wound battery, a current collector plate is usually used to connect between the tab of the electrode core and the terminal post. In some areas of the electrode core where there are fewer tabs or no tabs, the support of the electrode core for the current collector plate is insufficient. When welding the current collector plate and the terminal post, the current collector plate may tilt or deform towards the above-mentioned areas, resulting in poor welding or insecure welding between the current collector plate and the terminal post, affecting the reliability during the operation of the battery. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery cell, and the reliability of the battery cell during operation is relatively high.

[0004] The utility model also provides a battery pack having the above battery cell.

[0005] The utility model also provides a vehicle having the above battery pack.

[0006] The battery cell according to the first aspect of the utility model includes: an electrode core which is wound and formed; a current collector plate and a support member, the current collector plate is connected to the electrode core, and the support member is supported between the electrode core and the current collector plate.

[0007] The battery cell according to the first aspect of the utility model, by providing a support member between the electrode core and the current collector plate, on the one hand, the support member can provide support for the current collector plate in the area with fewer tabs or no tabs on the electrode core, reducing the probability of poor welding or insecure welding between the current collector plate and the terminal post. On the other hand, the support member can block the heat transferred towards the electrode core during the welding process of the current collector plate and the terminal post, reducing the probability of damage to the separator in the electrode core. Thus, the reliability of the battery cell during operation can be improved.

[0008] According to some embodiments of the utility model, a reel hole is defined inside the electrode core, and at least part of the support member is arranged along the circumference of the reel hole.

[0009] According to some embodiments of the utility model, the support member includes a support portion, the support portion extends circumferentially along the reel hole to form a ring shape, and in the radial direction of the reel hole, the inner circumference of the support portion extends inward beyond the circumference of the reel hole or is flush with the peripheral wall of the reel hole.

[0010] According to some embodiments of the utility model, in the axial direction of the reel hole, the thickness of the support portion is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0011] According to some embodiments of the present utility model, the support portion is circular, and the outer diameter of the support portion is greater than or equal to 4 mm and less than or equal to 20 mm.

[0012] According to some embodiments of the present utility model, the support member further includes an extension portion, the extension portion is annular and connected to the inner peripheral edge of the support portion, and the extension portion extends along the axial direction of the reel hole and extends into the reel hole.

[0013] According to some embodiments of the present utility model, in the direction of the current collecting plate facing the support member, at least a part of the outer peripheral surface of the extension portion extends obliquely towards the central axis of the reel hole.

[0014] According to some embodiments of the present utility model, the included angle between the outer peripheral surface of the extension portion and the axis of the reel hole is greater than 0° and less than or equal to 30°.

[0015] According to some embodiments of the present utility model, the support member is one of a PP material member, a PPS material member, a PET material member or a PI material member.

[0016] According to some embodiments of the present utility model, a central hole opposite to the reel hole of the electrode core is formed on the current collecting plate. The current collecting plate includes: a first connection area and a second connection area. The first connection area and the second connection area are connected to the electrode core. The first connection area and the second connection area are respectively arranged on both sides of the central hole, and the support member is arranged between the first connection area and the second connection area.

[0017] According to some embodiments of the present utility model, the first connection area and the second connection area are formed by the current collecting plate being recessed towards the electrode core.

[0018] According to some embodiments of the present utility model, the battery cell further includes: a housing and a cover plate assembly. One end of the housing has an open mouth. The electrode core is arranged in the housing. The cover plate assembly includes a cover plate and a pole column. The cover plate covers the open mouth of the housing, and the pole column passes through the cover plate and is connected to the current collecting plate.

[0019] According to some embodiments of the present utility model, the housing is a steel material member or an aluminum material member.

[0020] The battery pack according to the second aspect of the present utility model includes: the battery cell according to the first aspect of the present utility model.

[0021] According to the battery pack of the second aspect of the present utility model, by arranging the battery cell according to the first aspect of the present utility model, the reliability during the operation of the battery pack can be improved.

[0022] A vehicle according to the third aspect of the present utility model includes: the battery pack according to the second aspect of the present utility model.

[0023] By providing the battery pack according to the second aspect of the present utility model, the reliability of the vehicle during operation can be improved.

[0024] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic view of a battery cell according to an embodiment of the present utility model;

[0026] Figure 2 is Figure 1 a schematic view of the battery cell shown in another angle;

[0027] Figure 3 is Figure 2 a sectional view taken along the A-A direction shown in ;

[0028] Figure 4 is Figure 3 an enlarged view of B shown in ;

[0029] Figure 5 is Figure 1 an exploded view of the battery cell shown in ;

[0030] Figure 6 is Figure 5 a schematic view of the support member, current collector plate and cover plate assembly shown in ;

[0031] Figure 7 is Figure 5 a schematic view of the support member shown in ;

[0032] Figure 8 is Figure 7 a sectional view taken along the B-B direction shown in.

[0033] REFERENCE MARKS:

[0034] 100, battery cell;

[0035] 10, electrode core; 11, winding hole;

[0036] 20, current collector plate; 21, central hole; 22, first connection area; 23, second connection area;

[0037] 30, support member; 31, support portion; 32, extension portion;

[0038] 40, housing; 41, first cover plate;

[0039] 50. Cover plate assembly; 51. Cover plate; 52. Terminal post; 521. Connection part; 522. Lead-out part; 53. Liquid injection hole;

[0040] 60. Sealing cover;

[0041] 70. Sealing nail. Specific embodiments

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0043] Below, refer to Figures 1-8 Describe the measuring device according to the embodiment of the first aspect of the present invention.

[0044] As Figures 1-4 shown, the battery cell 100 according to the embodiment of the first aspect of the present invention includes: a pole core 10, a current collector plate 20, and a support member 30.

[0045] Specifically, the pole core 10 is wound and formed, the current collector plate 20 is connected to the pole core 10, and the support member 30 is supported between the pole core 10 and the current collector plate 20.

[0046] Among them, the pole core 10 can undergo an electrochemical reaction to realize the charge and discharge function of the battery cell 100. The end of the pole core 10 is provided with a tab. The pole core 10 conducts current with the current collector plate 20 through the tab. The current collector plate 20 is connected between the terminal post 52 and the tab. The support member 30 is made of an insulating material.

[0047] During the production process, first connect the current collector plate 20 to the tab at the end of the pole core 10, and then weld the current collector plate 20 to the terminal post 52. When welding the current collector plate 20 and the terminal post 52, the terminal post 52 will apply a pressure to the current collector plate 20. In some areas at the end of the pole core 10, the number of tabs is small, resulting in a thin thickness of the tabs, or no tabs are provided. In this way, under the action of the pressure of the terminal post 52, the current collector plate 20 may tilt or deform towards this part of the area, causing a gap between the current collector plate 20 and the terminal post 52, which may result in a poor weld or an insecure weld between the current collector plate 20 and the terminal post 52, affecting the reliability of the battery cell 100 during operation.

[0048] In this embodiment, by arranging a support member 30 between the electrode core 10 and the current collector plate 20, and the support member 30 is arranged in the area where the end tabs of the electrode core 10 are fewer or there are no tabs. During the welding process of the current collector plate 20 and the terminal post 52, the support member 30 can provide support between the electrode core 10 and the current collector plate 20, making the current collector plate 20 fit more closely with the terminal post 52. Thus, the probability of poor welding between the current collector plate 20 and the terminal post 52 can be reduced, and the positional accuracy of the cooperation between the current collector plate 20 and the terminal post 52 can be improved, thereby enhancing the reliability during the operation of the battery cell 100.

[0049] During the welding process of the current collector plate 20 and the terminal post 52, the temperature on the current collector plate 20 is relatively high. In the area where the number of end tabs of the electrode core 10 is fewer or there are no tabs, when the current collector plate 20 is tilted towards this area under the pressure of the terminal post 52, the thickness of the tabs is relatively thin or there are no tabs, which will cause the heat on the current collector plate 20 to be directly transferred to the electrode tab and the separator of the electrode core 10, and it is easy to damage the separator.

[0050] In this embodiment, by arranging a support member 30 between the electrode core 10 and the current collector plate 20, the support member 30 can provide a barrier between the electrode core 10 and the current collector plate 20, reducing the heat transferred towards the area where the number of end tabs of the electrode core 10 is fewer or there are no tabs, thereby reducing the probability of damage to the separator, and thus enhancing the reliability during the operation of the battery cell 100.

[0051] For the battery cell 100 according to the first aspect embodiment of the present invention, by arranging a support member 30 between the electrode core 10 and the current collector plate 20, on the one hand, the support member 30 can provide support for the current collector plate 20 in the area where the tabs on the electrode core 10 are fewer or there are no tabs, reducing the probability of poor welding or insecure welding between the current collector plate 20 and the terminal post 52. On the other hand, the support member 30 can block the heat transferred towards the electrode core 10 during the welding process of the current collector plate 20 and the terminal post 52, reducing the probability of damage to the separator in the electrode core 10. Thus, the reliability during the operation of the battery cell 100 can be improved.

[0052] In some embodiments of the present invention, as Figures 3-5 shown, a winding shaft hole 11 is defined inside the electrode core 10, and at least a part of the support member 30 is arranged along the circumference of the winding shaft hole 11. That is to say, part of the support member 30 can be arranged along the circumference of the winding shaft hole 11, or all of the support member 30 can be arranged along the circumference of the winding shaft hole 11.

[0053] For those skilled in the art, it can be understood that during the winding process of the electrode core 10, in order to avoid interference between the tab and the winding needle, no tab is provided at the starting section of the winding of the electrode sheet. In this way, on the wound electrode core 10, there is a small area along the circumference of the reel hole 11 where there are fewer tabs or even no tabs. By arranging at least a part of the support member 30 along the circumference of the reel hole 11, the support member 30 can support the circumferential area of the reel hole 11, thereby improving the reliability of the welding between the current collector plate 20 and the pole column 52.

[0054] In some embodiments of the present utility model, such as Figure 4 , Figure 7 and Figure 8 shown, the support member 30 includes a support portion 31, and the support portion 31 extends circumferentially along the reel hole 11 to form a ring shape. In the radial direction of the reel hole 11, the inner circumference of the support portion 31 extends inward beyond the circumference of the reel hole 11 or is flush with the circumferential wall of the reel hole 11. In this way, the support member 30 is more stable on the electrode core 10, thereby improving the stability of the support of the support member 30 for the current collector plate 20, and further improving the reliability of the welding between the current collector plate 20 and the pole column 52 and the matching accuracy between the current collector plate 20 and the pole column 52.

[0055] In some embodiments of the present utility model, such as Figure 8 shown, in the axial direction of the reel hole 11, the thickness h1 of the support portion 31 is greater than or equal to 0.2 mm and less than or equal to 1 mm. For example, the thickness h1 of the support portion 31 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.7 mm, 0.9 mm or 1 mm. Thus, the support strength of the support member 30 for the current collector plate 20 can meet the usage requirements, and the support member 30 does not occupy too much layout space. Preferably, the thickness h1 of the support portion 31 is greater than or equal to 0.2 mm and less than or equal to 0.4 mm.

[0056] In some embodiments of the present utility model, such as Figure 7 and Figure 8 shown, the support portion 31 is circular ring-shaped, and the outer diameter d1 of the support portion 31 is greater than or equal to 4 mm and less than or equal to 20 mm. For example, the outer diameter d1 of the support portion 31 can be 4 mm, 5 mm, 8 mm, 10 mm, 13 mm, 17 mm or 20 mm. Thus, the support strength of the support portion 31 can meet the usage requirements, and the support portion 31 does not occupy too much connection area between the current collector plate 20 and the pole column 52, so that the impedance of the electrical connection between the current collector plate 20 and the pole column 52 meets the usage requirements. Preferably, the outer diameter d1 of the support portion 31 is greater than or equal to 8 mm and less than or equal to 13 mm.

[0057] In some embodiments of the present utility model, such as Figure 4 and Figure 8As shown, the support member 30 further includes an extension portion 32. The extension portion 32 is annular and connected to the inner peripheral edge of the support portion 31. The extension portion 32 extends along the axial direction of the reel hole 11 and extends into the reel hole 11. By providing the extension portion 32, during the assembly process, the extension portion 32 and the reel hole 11 cooperate to position the support member 30, so that the support member 30 can be quickly placed in place, reducing the assembly difficulty and improving the assembly accuracy. After the assembly is completed, the reel hole 11 can limit the movement of the support member 30 through the extension portion 32, thereby improving the stability of the support member 30 on the electrode core 10.

[0058] Among them, it can be that after the winding of the electrode core 10 is completed, the extension portion 32 of the support member 30 is extended into the reel hole 11, or it can be that the extension portion 32 is wound into the reel hole 11 during the winding process.

[0059] In some embodiments of the present invention, as Figure 4 and Figure 8 shown, in the direction of the current collector plate 20 facing the support member 30, at least a part of the outer peripheral surface of the extension portion 32 extends obliquely towards the central axis of the reel hole 11. That is to say, it can be that a part of the outer peripheral surface of the extension portion 32 extends obliquely towards the central axis of the reel hole 11, or it can be that the outer peripheral surface of the extension portion 32 extends obliquely towards the central axis of the reel hole 11. In this way, in the direction of the extension portion 32 facing the electrode core 10, the outer diameter dimension will decrease. During the assembly process, the part with a smaller outer diameter dimension of the extension portion 32 first extends into the reel hole 11, which can reduce the assembly difficulty of the support member 30 on the electrode core 10.

[0060] In some embodiments of the present invention, as Figure 8 shown, the included angle α between the outer peripheral surface of the extension portion 32 and the axis of the reel hole 11 is greater than 0° and less than or equal to 30°. For example, the included angle α between the outer peripheral surface of the extension portion 32 and the axis of the reel hole 11 can be 3°, 5°, 8°, 9°, 10°, 24° or 30°. Thus, at least a part of the outer peripheral surface of the extension portion 32 can be extended obliquely towards the central axis of the reel hole 11, and the size of the reel hole 11 adapted to the extension portion 32 will not be too large, so that the size of the electrode core 10 can meet the use requirements. Preferably, the included angle α between the outer peripheral surface of the extension portion 32 and the axis of the reel hole 11 is greater than 5° and less than or equal to 10°.

[0061] In some embodiments of the present invention, as Figure 8As shown, the inner diameter d2 of the support portion 31 is greater than or equal to 2 mm and less than or equal to 10 mm. For example, the inner diameter d2 of the support portion 31 can be 2 mm, 4 mm, 5 mm, 6 mm, 7 mm, 9 mm or 10 mm. Among them, the inner hole of the support portion 31 is opposite to the liquid injection hole 53 of the battery cell 100. Thus, the liquid injection efficiency of the battery cell 100 can meet the usage requirements. Preferably, the inner diameter d2 of the support portion 31 is greater than or equal to 4 mm and less than or equal to 7 mm.

[0062] In some embodiments of the present invention, as Figure 8 shown, the wall thickness L1 of the extension portion 32 is greater than or equal to 0.2 mm and less than or equal to 1 mm. For example, the wall thickness L1 of the extension portion 32 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm. Thus, the performance parameters of the extension portion 32 can meet the usage requirements.

[0063] In some embodiments of the present invention, as Figure 8 shown, in the axial direction of the axis of the reel hole 11, the ratio of the size h2 of the support member 30 to the size of the electrode core 10 is greater than or equal to 3 / 5 and less than or equal to 5 / 6. For example, the ratio of the size h2 of the support member 30 to the size of the electrode core 10 can be 3 / 5, 4 / 5 or 5 / 6. Thus, the limiting effect of the extension portion 32 can meet the usage requirements, and the production cost of the support member 30 will not be too high. Preferably, the size h2 of the support member 30 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0064] In some embodiments of the present invention, the support member 30 is one of a PP material member, a PPS material member, a PET material member or a PI material member. Thus, the support member 30 can be insulated, and the material properties of the support member 30 can meet the usage requirements. During the product design process, the raw materials for manufacturing the support member 30 can be adjusted according to the design requirements, so as to meet more product design needs.

[0065] In some embodiments of the present invention, as Figure 5 and Figure 6 shown, a central hole 21 opposite to the reel hole 11 of the electrode core 10 is formed on the current collector plate 20. The current collector plate 20 includes: a first connection area 22 and a second connection area 23. The first connection area 22 and the second connection area 23 are connected to the electrode core 10. The first connection area 22 and the second connection area 23 are respectively arranged on both sides of the central hole 21. The support member 30 is arranged between the first connection area 22 and the second connection area 23.

[0066] Thus, when the current collector plate 20 is connected to the electrode core 10, the acting force on the support member 30 is relatively uniform, thereby improving the position accuracy of the support member 30 on the electrode core 10. Moreover, since the first connection region 22 and the second connection region 23 are on both sides of the central hole 21, the current distribution can be made more uniform during the transfer between the current collector plate 20 and the electrode core 10, further enhancing the reliability of the battery cell 100 during operation.

[0067] In some embodiments of the present utility model, as Figure 5 shown, the first connection region 22 and the second connection region 23 are formed by recessing the current collector plate 20 towards the electrode core 10. In this way, the first connection region 22 and the second connection region 23 can be more easily fitted to the tabs on the electrode core 10, thereby reducing the process difficulty of connecting the current collector plate 20 and the electrode core 10. Additionally, a groove recessed towards the current collector plate 20 can be formed between the first connection region 22 and the second connection region 23, further reducing the probability of the current collector plate 20 tilting or deforming towards the peripheral region of the winding hole 11 on the electrode core 10, and further enhancing the reliability of the battery cell 100 during operation.

[0068] In some embodiments of the present utility model, as Figure 1 、 Figure 4 、 Figure 5 and Figure 6 shown, the battery cell 100 further includes: a housing 40 and a cover plate assembly 50. One end of the housing 40 has an open end, the electrode core 10 is disposed inside the housing 40, the cover plate assembly 50 includes a cover plate 51 and a terminal post 52, the cover plate 51 covers the open end of the housing 40, and the terminal post 52 passes through the cover plate 51 and is connected to the current collector plate 20. That is to say, the terminal post 52 is integrated into the cover plate assembly 50. In this way, during the assembly process, the terminal post 52 and the cover plate assembly 50 can be assembled onto the housing 40 together, thereby reducing the production difficulty.

[0069] Wherein, the end of the housing 40 far from the open end is sealed by a first cover plate 41. The terminal post 52 includes a connection portion 521 welded to the current collector plate 20 and a lead-out portion 522 extending out of the cover plate 51. A liquid injection hole 53 penetrating through the lead-out portion 522 and the connection portion 521 is formed on the terminal post 52. The liquid injection hole 53 is opposite to the central hole 21 of the current collector plate 20, the inner hole of the support member 30, and the winding hole 11. In the lead-out portion 522, the liquid injection hole 53 is sealed by a sealing cover 60, and in the connection portion 521, the liquid injection hole 53 is sealed by a sealing nail 70.

[0070] In some embodiments of the present utility model, the housing 40 is a steel material part or an aluminum material part. Among them, the steel material part has relatively stable chemical properties and high strength. When the battery cell 100 uses the steel material housing 40, the housing 40 is not easily corroded, and the protection effect on the internal components of the battery cell 100 can be improved. The aluminum material part has a low density, good thermal conductivity and relatively stable chemical properties. When the battery cell 100 uses the aluminum material housing 40, it is beneficial to realize the light weight of the battery cell 100, and the heat dissipation effect of the battery cell 100 is better.

[0071] The battery pack according to the second aspect embodiment of the present utility model includes: the battery cell 100 according to the first aspect embodiment of the present utility model described above.

[0072] By providing the battery cell 100 according to the first aspect embodiment of the present utility model, the reliability of the battery pack during operation can be improved.

[0073] The vehicle according to the third aspect embodiment of the present utility model includes: the battery pack according to the second aspect embodiment of the present utility model described above.

[0074] By providing the battery pack according to the second aspect embodiment of the present utility model, the reliability of the vehicle during operation can be improved.

[0075] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0076] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0077] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0079] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, Comprising: A pole core, the pole core being wound and formed; A current collector plate and a support member, the current collector plate being connected to the pole core, and the support member being supported between the pole core and the current collector plate.

2. The battery cell according to claim 1, characterized in that, A reel hole is defined inside the pole core, and at least a part of the support member is arranged along the circumference of the reel hole.

3. The battery cell according to claim 2, characterized in that, The support member includes a support portion, the support portion extends circumferentially along the reel hole to form a ring shape, and in the radial direction of the reel hole, the inner circumference of the support portion extends inward beyond the circumference of the reel hole or is flush with the peripheral wall of the reel hole.

4. The battery cell according to claim 3, wherein In the axial direction of the reel hole, the thickness of the support portion is greater than or equal to 0.2 mm and less than or equal to 1 mm.

5. The battery cell according to claim 3, characterized in that, The support portion is in a circular ring shape, and the outer diameter of the support portion is greater than or equal to 4 mm and less than or equal to 20 mm.

6. The battery cell according to claim 3, characterized in that, The support member further includes an extension portion, the extension portion is in a ring shape and is connected to the inner circumference of the support portion, and the extension portion extends along the axial direction of the reel hole and extends into the reel hole.

7. The battery cell according to claim 6, characterized in that, In the direction of the current collector plate facing the support member, at least a part of the outer peripheral surface of the extension portion extends obliquely towards the central axis of the reel hole.

8. The battery cell according to claim 7, wherein The included angle between the outer peripheral surface of the extension portion and the axis of the reel hole is greater than 0° and less than or equal to 30°.

9. The battery cell according to claim 1, wherein, The support member is one of a PP material member, a PPS material member, a PET material member or a PI material member.

10. The battery cell according to claim 1, characterized in that, A central hole opposite to the reel hole of the pole core is formed on the current collector plate, and the current collector plate includes: A first connection area and a second connection area, the first connection area and the second connection area are connected to the pole core, the first connection area and the second connection area are respectively arranged on both sides of the central hole, and the support member is arranged between the first connection area and the second connection area.

11. The battery cell according to claim 10, characterized in that, The first connection area and the second connection area are formed by the current collector plate being recessed towards the pole core direction.

12. The battery cell according to any one of claims 1-11, characterized in that, Further comprising: A housing and a cover plate assembly, one end of the housing has an open mouth, the pole core is arranged inside the housing, the cover plate assembly includes a cover plate and a pole post, the cover plate covers the open mouth of the housing, and the pole post passes through the cover plate and is connected to the current collector plate.

13. The battery cell according to claim 12, characterized in that, The housing is a steel material member or an aluminum material member.

14. A battery pack, characterized in that, Comprising: The battery cell according to any one of claims 1-13.

15. A vehicle, characterized in that, Comprising: The battery pack according to claim 14.

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