Battery cell and battery module

Abstract

The utility model discloses a battery cell and a battery module, and belongs to the technical field of batteries. The battery cell comprises a shell, a roll core, a positive pole lug, a negative pole lug and a damping ring. Wherein the damping ring is arranged outside the roll core in a sleeving mode and located between the roll core and the side plate, and the damping ring is distributed on the side closer to the bottom plate. By arranging the damping ring between the roll core and the side plate, when the battery cell is vibrated by the outside, the shaking amplitude of the roll core in the shell can be reduced, and the pulling force of the roll core to the negative tab can be reduced, so that the risk that the negative tab falls off is reduced, and the stability of the battery cell is improved. In addition, the damping ring is close to the negative pole lug, so that the fixing effect of the damping ring on the roll core and the negative pole lug can be enhanced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery module. Background Art

[0002] A wound battery refers to a battery composed of battery cells that are combined and formed in a winding manner. The battery cell usually includes a shell and a winding core located inside the shell. The winding core refers to a structure in which the positive electrode sheet, the negative electrode sheet and the diaphragm paper are combined and formed through a winding process.

[0003] The negative electrode tab of the winding core is welded to the shell via the negative tab. Due to the gap between the winding core and the shell for assembly, if the battery cell is shaken after assembly, the winding core will shake inside the shell, pulling on the negative tab, increasing the risk of the tab falling off. Utility Model Content

[0004] The present application provides a battery cell and a battery module. The technical solution is as follows:

[0005] According to one aspect of the present application, a battery cell is provided, comprising: a shell, a winding core, a positive electrode tab, a negative electrode tab, and a shock absorbing ring;

[0006] The housing comprises: a bottom plate and side plates connected to each other, wherein the bottom plate and the side plates enclose a receiving space, and the winding core is located in the receiving space;

[0007] The positive electrode tab is connected to the first end of the winding core, and the negative electrode tab is connected to the second end of the winding core and the bottom plate respectively;

[0008] The shock-absorbing ring is sleeved outside the winding core and is located between the winding core and the side plate. The shock-absorbing ring is distributed on a side closer to the bottom plate.

[0009] Optionally, a side of the shock-absorbing ring facing away from the winding core is in contact with the side plate.

[0010] Optionally, in the radial direction of the battery core, the thickness of the shock-absorbing ring is less than or equal to the distance between the winding core and the side plate.

[0011] Optionally, the battery cell further includes: a negative electrode insulation pad, wherein the negative electrode insulation pad is located between the winding core and the bottom plate, and an outer edge of the negative electrode insulation pad is connected to the shock-absorbing ring.

[0012] Optionally, the shock-absorbing ring is an annular plate body, the annular plate body extends along the circumference of the winding core, and the side of the annular plate body facing the bottom plate is connected to the outer edge of the negative electrode insulation pad;

[0013] Alternatively, the shock-absorbing ring includes a plurality of arc-shaped plates, which are distributed around the periphery of the winding core, and the side of each arc-shaped plate facing the bottom plate is connected to the outer edge of the negative electrode insulation pad.

[0014] Optionally, the negative electrode insulation pad and the shock-absorbing ring are an integrated structure.

[0015] Optionally, a connection between a side of the shock-absorbing ring facing the winding core and a side of the shock-absorbing ring facing away from the bottom plate has a chamfered structure.

[0016] Optionally, the chamfer angle of the chamfer structure is negatively correlated with the height of the shock-absorbing ring in the axial direction of the battery core.

[0017] Optionally, the battery core further includes: an adhesive layer, the adhesive layer is located between the shock-absorbing ring and the side plate, and the adhesive layer is bonded to the shock-absorbing ring and the side plate respectively.

[0018] According to another aspect of the present application, a battery module is provided, comprising: a plurality of connected battery cells, each of the battery cells being the above-mentioned battery cell.

[0019] In the embodiments of the present application, a shock-absorbing ring is provided between the winding core and the side plate. This reduces the shaking of the winding core within the casing when the battery cell is subjected to external vibrations, thereby alleviating the pulling force of the winding core on the negative electrode tab, thereby reducing the risk of the negative electrode tab falling off and improving the stability of the battery cell. Furthermore, the shock-absorbing ring is located close to the negative electrode tab, which can enhance the fixing effect of the shock-absorbing ring on the winding core and the negative electrode tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0022] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure of a battery cell shown;

[0023] Figure 3 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0024] Figure 4 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0025] Figure 5 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0026] Figure 6 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0027] Figure 7 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0028] Figure 8 This is a schematic structural diagram of a shock-absorbing ring provided in an embodiment of the present application;

[0029] Figure 9 This is a schematic structural diagram of another shock-absorbing ring provided in an embodiment of the present application;

[0030] Figure 10 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0031] Figure 11 This is a schematic diagram of the relationship between the height and chamfer angle of a shock-absorbing ring provided in an embodiment of the present application;

[0032] Figure 12 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application;

[0033] Figure 13 This is a schematic structural diagram of another battery cell provided in an embodiment of the present application.

[0034] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0036] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of a battery cell 10 provided in an embodiment of the present application. Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of a battery cell 10 is shown. Figure 1 The exploded structure diagram of the battery cell 10 is also shown in the figure to clearly illustrate the structure inside the housing 11 of the battery cell 10. The battery cell 10 may include: a housing 11, a winding core 12, a positive electrode tab 13, a negative electrode tab 14, and a shock absorbing ring 15.

[0037] The housing 11 may include a bottom plate 111 and side plates 112 connected to each other. The bottom plate 111 and side plates 112 enclose a storage space within which the winding core 12 is located. The bottom plate 111 may be connected to one end of the side plates 112 to form a barrel-shaped storage space. When the winding core 12 is assembled within the housing 11, it can provide protection for the winding core 12.

[0038] The winding core 12 has a first end and a second end that are opposite to each other along the axial direction D2 of the battery cell 10. The first end is located on the side of the second end facing away from the bottom plate 111. The positive electrode tab 13 is connected to the first end of the winding core 12, and the negative electrode tab 14 is respectively connected to the second end of the winding core 12 and the bottom plate 111. The winding core 12 can be formed by winding a stack of positive and negative electrode sheets and separator paper. One end of the positive electrode tab 13 can be electrically connected to the positive electrode sheet, and the other end of the positive electrode tab 13 is located outside the first end of the winding core 12. One end of the negative electrode tab 14 can be electrically connected to the negative electrode sheet, and the other end of the negative electrode tab 14 is located outside the second end of the winding core 12. The other end of the negative electrode tab 14 located outside the winding core 12 can be welded to the bottom plate 111 of the shell 11. That is, the negative electrode tab 14 is fixedly connected to the winding core 12 and the bottom plate 111 of the shell 11, respectively.

[0039] The shock-absorbing ring 15 is disposed outside the winding core 12 and is located between the winding core 12 and the side plate 112. The shock-absorbing ring 15 is located on the side closer to the bottom plate 111. The shortest distance between the shock-absorbing ring 15 and the second end of the winding core 12 is shorter than the shortest distance between the shock-absorbing ring 15 and the first end of the winding core 12.

[0040] By providing a shock-absorbing ring 15 between the winding core 12 and the side plate 112, the vibration amplitude of the winding core 12 within the housing 11 can be reduced when the battery cell 10 is subjected to external vibrations. This can reduce the pulling force of the winding core 12 on the negative electrode tab 14, thereby reducing the risk of the negative electrode tab 14 falling off and improving the stability of the battery cell 10. In addition, the shock-absorbing ring 15 is close to the negative electrode tab 14, which can enhance the fixing effect of the shock-absorbing ring 15 on the winding core 12 and the negative electrode tab 14.

[0041] In summary, the embodiment of the present application provides a battery cell including a shell, a winding core, a positive electrode tab, a negative electrode tab and a shock-absorbing ring, wherein the shock-absorbing ring is sleeved outside the winding core and is located between the winding core and the side plate, and the shock-absorbing ring is distributed on the side closer to the bottom plate. By arranging the shock-absorbing ring between the winding core and the side plate, when the battery cell is subjected to external vibrations, the shaking amplitude of the winding core in the shell can be reduced, and the pulling force of the winding core on the negative electrode tab can be reduced, so as to reduce the risk of the negative electrode tab falling off and improve the stability of the battery cell. In addition, the shock-absorbing ring is close to the negative electrode tab, which can enhance the fixing effect of the shock-absorbing ring on the winding core and the negative electrode tab.

[0042] Please refer to Figure 3 and Figure 4 , Figure 3 is a structural diagram of another battery cell 10 provided in an embodiment of the present application. Figure 4 This is a schematic diagram of the structure of another battery cell 10 provided in an embodiment of the present application. In one optional embodiment, in the radial direction D1 of the battery cell 10, the thickness b1 of the shock-absorbing ring 15 is less than or equal to the distance b2 between the core 12 and the side plate 112. A predetermined installation gap is provided between the core 12 and the side plate 112 of the housing 11 to reduce the difficulty of placing the core 12 in the accommodation space of the housing 11 during assembly of the battery cell 10.

[0043] Exemplarily, the assembly process of the battery cell 10 may include first placing the shock-absorbing ring 15 in the accommodation space of the shell 11, and then placing the core 12 in the accommodation space with the shock-absorbing ring 15. If the thickness b1 of the shock-absorbing ring 15 is greater than the distance b2 between the core 12 and the side plate 112, it will make it difficult to assemble the core 12 into the available accommodation space. Moreover, even if the assembly force is increased to assemble the core 12 into the accommodation space, the shock-absorbing ring 15 with a thicker thickness b1 will apply an extrusion force to the core 12 in the radial direction D1 of the core 12, causing damage to the core 12. Therefore, by setting the thickness b1 of the shock-absorbing ring 15 to be less than or equal to the distance b2 between the core 12 and the side plate 112, the following two effects can be achieved: first, the difficulty of assembling the core 12 can be reduced, and second, the shock-absorbing ring 15 can be prevented from squeezing the core 12.

[0044] Please refer to Figure 3 and Figure 4 In an optional embodiment, the side of the shock-absorbing ring 15 facing away from the winding core 12 contacts the side plate 112. The shock-absorbing ring 15 has an inner wall and an outer wall that are opposite to each other along the radial direction D1 of the winding core 12, with the inner wall located on the side of the outer wall close to the winding core 12. The shock-absorbing ring 15 also has an annular bottom surface and an annular top surface that are opposite to each other along the axial direction D2 of the winding core 12, with the bottom surface located on the side of the top surface close to the bottom plate 111 of the housing 11, wherein the bottom surface is connected to the inner wall and the outer wall respectively, and the top surface is connected to the inner wall and the outer wall respectively.

[0045] The surface of the shock-absorbing ring 15 on the side facing away from the winding core 12 is the outer wall, and the outer wall of the shock-absorbing ring 15 can be in contact with the side plate 112 of the shell 11. For example, the outer wall of the shock-absorbing ring 15 can be fitted with the side of the side plate 112 of the shell 11 close to the winding core 12, which can further prevent the shock-absorbing ring 15 from squeezing the winding core 12.

[0046] Please refer to Figure 5 and Figure 6 , Figure 5 is a structural diagram of another battery cell 10 provided in an embodiment of the present application. Figure 6FIG1 is a schematic structural diagram of another battery cell 10 provided in an embodiment of the present application. In an optional embodiment, the battery cell 10 may further include a negative electrode insulating pad 16. The negative electrode insulating pad 16 is located between the winding core 12 and the bottom plate 111 of the housing 11, and the outer edge of the negative electrode insulating pad 16 is connected to the shock absorbing ring 15. The shock absorbing ring 15 may be bonded to the negative electrode insulating pad 16 to improve the stability of the shock absorbing ring 15.

[0047] Please refer to Figure 5 In an optional embodiment, the battery cell 10 may further include a cover plate 18 and a positive electrode insulating pad 19. The cover plate 18 is connected to the side of the side plate 112 of the housing 11 facing away from the bottom plate 111. The positive electrode insulating pad 19 is located between the winding core 12 and the cover plate 18. The cover plate 18 is used to encapsulate the winding core 12 located in the receiving space and can also have the function of fixing the winding core 12.

[0048] Please refer to Figure 7 , Figure 7 is a structural diagram of another battery cell 10 provided in an embodiment of the present application. Figure 7 The structural schematic diagram of the battery cell 10 shown can be a schematic diagram of looking at the winding core 12 from the side of the negative electrode insulating pad 16 facing away from the winding core 12. The negative electrode insulating pad 16 also has an avoidance through-hole k1. The other end of the negative electrode tab 14 can pass through the avoidance through-hole k1 and be located between the negative electrode insulating pad 16 and the bottom plate 111 of the shell 11. The shape of the negative electrode tab 14 can be sheet-shaped, the avoidance through-hole k1 can be circular, and the diameter of the avoidance through-hole k1 is larger than the size of the portion of the negative electrode tab 14 located in the avoidance through-hole k1. In this way, during the process of assembling the negative electrode insulating pad 16 and the negative electrode tab 14, there is no need for alignment, which can reduce the difficulty of assembling the battery cell 10 and improve the assembly efficiency of the battery cell 10. The negative electrode insulating pad 16 can serve as an insulator between the winding core 12 and the bottom plate 111 of the shell 11, and can also serve as an insulator between the winding core 12 and the other end of the negative electrode tab 14.

[0049] In an exemplary embodiment, the negative electrode insulation pad 16 has a groove on one side close to the bottom plate 111 of the shell 11, and a portion of the negative electrode tab 14 can be located in the groove to reduce the distance between the negative electrode insulation pad 16 and the bottom plate 111 of the shell 11, thereby further enhancing the stability of the battery cell 10.

[0050] Please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic structural diagram of a shock-absorbing ring 15 provided in an embodiment of the present application. Figure 9This is a schematic diagram of the structure of another shock-absorbing ring 15 provided in an embodiment of the present application. In an alternative embodiment, the shock-absorbing ring 15 can be an annular plate extending along the circumference of the winding core 12. The side of the annular plate facing the bottom plate 111 is connected to the outer edge of the negative electrode insulating pad 16. The annular plate can be mounted on the winding core 12 and can be displaced between the winding core 12 and the side plate 112 of the housing 11.

[0051] In an exemplary embodiment, the thickness of the annular plate is the same at all positions, so that when the battery cell 10 vibrates, the force on the core 12 in the circumferential direction is relatively uniform, thereby avoiding a large extrusion force at any position on the core 12, which may cause damage to the core 12.

[0052] Or, as Figure 9 As shown, the shock-absorbing ring 15 may include multiple curved plates 151, which are distributed around the periphery of the winding core 12. The side of each curved plate 151 facing the bottom plate 111 is connected to the outer edge of the negative electrode insulation pad 16. The multiple curved plates 151 can be evenly spaced around the avoidance hole k1 of the negative electrode insulation pad 16. Exemplarily, the shock-absorbing ring 15 may include six curved plates 151, and the distance between any two adjacent curved plates 151 is equal.

[0053] In an optional embodiment, the negative electrode insulation pad 16 can be an integral structure with the shock absorbing ring 15, which can further enhance the connection stability of the negative electrode insulation pad 16 and the shock absorbing ring 15, and can simplify the assembly steps of the battery cell 10. Exemplarily, when the negative electrode insulation pad 16 and the shock absorbing ring 15 are two structures, in the process of assembling the battery cell 10, the negative electrode insulation pad 16 can be placed in the accommodation space of the shell 11 first, and then the shock absorbing ring 15 can be placed in the accommodation space of the shell 11. When the negative electrode insulation pad 16 and the shock absorbing ring 15 are an integral structure, in the process of assembling the battery cell 10, the negative electrode insulation pad 16 and the shock absorbing ring 15 can be placed in the accommodation space of the shell 11 in one operation.

[0054] The negative electrode insulation pad 16 and the shock absorbing ring 15 can be demoulded by a stamping process or an injection molding process. By setting the shock absorbing ring 15 as a plurality of arc-shaped plates 151, the demoulding difficulty of the negative electrode insulation pad 16 and the shock absorbing ring 15 during the manufacturing process can be reduced.

[0055] Please refer to Figure 10 , Figure 10It is a schematic structural diagram of another battery cell 10 provided in an embodiment of the present application. In an optional embodiment, the connection between the side of the shock-absorbing ring 15 facing the core 12 and the side of the shock-absorbing ring 15 facing away from the bottom plate 111 has a chamfered structure R1. In this way, when the core 12 is assembled into the accommodating space equipped with the shock-absorbing ring 15, the chamfered structure R1 can facilitate the placement of the core 12 into the inner side of the side plate 112 of the shock-absorbing ring 15 facing away from the shell 11, which can reduce the difficulty of installing the core 12. In other words, the chamfered structure R1 can serve as an installation guide structure for the core 12, which can reduce the difficulty of assembling the core 12 into the shell 11.

[0056] Please refer to Figure 11 , Figure 11 FIG2 is a schematic diagram illustrating the relationship between the height h1 and the chamfer angle α1 of a shock-absorbing ring 15 provided in an embodiment of the present application. In one optional embodiment, the chamfer angle α1 of the chamfer structure R1 is negatively correlated with the height h1 of the shock-absorbing ring 15 in the axial direction D2 of the battery cell 10. In other words, the higher the height h1 of the shock-absorbing ring 15, the smaller the chamfer angle α1. This allows the chamfer structure R1 of the shock-absorbing ring 15 to be adaptively adjusted based on the height h1 of the shock-absorbing ring 15, thereby reducing the impact of the shock-absorbing ring 15 on the assembly of the winding core 12.

[0057] Please refer to Figure 11 In an exemplary embodiment, the chamfer angle α1 may refer to the acute angle between the plane where the chamfer structure R1 is located and the sidewall of the shock-absorbing ring 15. The chamfer angle α1 may range from 30 degrees to 80 degrees. Within this range, the winding core 12 can be more easily assembled into the inner side of the shock-absorbing ring 15. Exemplarily, the chamfer angle α1 of the chamfer structure R1 is 30 degrees, 35 degrees, 40 degrees, 45 degrees, 55 degrees, or 70 degrees.

[0058] In an exemplary embodiment, the height h1 of the shock absorbing ring 15 along the axial direction D2 of the battery cell 10 ranges from 1 mm to 10 mm. Exemplarily, the height h1 of the shock absorbing ring 15 along the axial direction D2 of the battery cell 10 is 1 mm, 1.8 mm, 2.5 mm, 3 mm, 4.5 mm, 6 mm, 7 mm, or 9 mm. When the height h1 of the shock absorbing ring 15 along the axial direction D2 of the battery cell 10 is 2 mm, the chamfer angle α1 of the chamfer structure R1 of the shock absorbing ring 15 is 45°. When the height h1 of the shock absorbing ring 15 along the axial direction D2 of the battery cell 10 is 4 mm, the chamfer angle α1 of the chamfer structure R1 of the shock absorbing ring 15 is 60°.

[0059] Please refer to Figure 12 and Figure 13 , Figure 12 is a structural diagram of another battery cell 10 provided in an embodiment of the present application. Figure 131 is a schematic diagram of the structure of another battery cell 10 provided in an embodiment of the present application. In an optional embodiment, the battery cell 10 may further include: an adhesive layer 17, the adhesive layer 17 is located between the shock-absorbing ring 15 and the side plate 112, and the adhesive layer 17 is respectively bonded to the shock-absorbing ring 15 and the side plate 112. The adhesive layer 17 can further improve the connection stability of the shock-absorbing ring 15, and during the assembly process of the core 12, the adhesive layer 17 can prevent the core 12 from scratching the shock-absorbing ring 15 and causing deformation of the shock-absorbing ring 15. That is, the adhesive layer 17 can be used to maintain the shape of the core 12.

[0060] In addition, in an embodiment of the present application, the shock-absorbing ring 15 can be bonded only to the side plate 112 of the shell 11, and the shock-absorbing ring 15 and the core 12 are not bonded. In this way, when the core 12 in the shell 11 needs to be replaced, the core 12 can be removed from the shell 11 more easily.

[0061] In an optional embodiment, the battery cell 10 may further include an adhesive layer located between the shock-absorbing ring 15 and the core 12, that is, the inner and outer sides of the shock-absorbing ring 15 may be bonded to the core 12 and the side plate 112 of the shell 11, respectively. In this way, the core 12 can be fixed in the accommodating space of the shell 11, and when the battery cell 10 is subjected to external vibration, the core 12 can be prevented from rotating or displacing in the shell 11, which can further enhance the vibration resistance of the battery cell 10.

[0062] In an optional embodiment, the battery cell 10 may be a cylindrical battery. Of course, the battery cell 10 may also be in other shapes such as a square, which is not limited in this embodiment of the present application.

[0063] In an alternative embodiment, the negative electrode insulating pad 16 and the shock absorbing pad can be made of plastic material, and the outer shell can be made of steel.

[0064] In summary, the embodiment of the present application provides a battery cell including a shell, a winding core, a positive electrode tab, a negative electrode tab and a shock-absorbing ring, wherein the shock-absorbing ring is sleeved outside the winding core and is located between the winding core and the side plate, and the shock-absorbing ring is distributed on the side closer to the bottom plate. By arranging the shock-absorbing ring between the winding core and the side plate, when the battery cell is subjected to external vibrations, the shaking amplitude of the winding core in the shell can be reduced, and the pulling force of the winding core on the negative electrode tab can be reduced, so as to reduce the risk of the negative electrode tab falling off and improve the stability of the battery cell. In addition, the shock-absorbing ring is close to the negative electrode tab, which can enhance the fixing effect of the shock-absorbing ring on the winding core and the negative electrode tab.

[0065] In addition, an embodiment of the present application further provides a battery module, which includes: a plurality of connected battery cells, each battery cell being a battery cell in any of the above embodiments.

[0066] The term "at least one of A and B" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, at least one of A and B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0067] It should be noted that in the accompanying drawings, the sizes of regions may be exaggerated for clarity of illustration. It is also understood that when an element is referred to as being "on" another element, it may be directly on the other element, or there may be an intervening element. Additionally, it is understood that when an element is referred to as being "under" another element, it may be directly under the other element, or there may be one or more intervening elements. Additionally, it is also understood that when an element is referred to as being "between" two elements, it may be the only element between the two elements, or there may be one or more intervening elements. Similar reference numerals throughout indicate similar elements.

[0068] In this application, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise expressly limited.

[0069] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: a shell (11), a winding core (12), a positive electrode tab (13), a negative electrode tab (14) and a shock absorbing ring (15); The housing (11) comprises: a bottom plate (111) and a side plate (112) connected to each other, wherein the bottom plate (111) and the side plate (112) enclose a receiving space, and the winding core (12) is located in the receiving space; The positive electrode tab (13) is connected to the first end of the winding core (12), and the negative electrode tab (14) is connected to the second end of the winding core (12) and the bottom plate (111) respectively; The shock-absorbing ring (15) is sleeved outside the winding core (12) and is located between the winding core (12) and the side plate (112). The shock-absorbing ring (15) is distributed on the side closer to the bottom plate (111).

2. The battery cell according to claim 1, characterized in that The side of the shock-absorbing ring (15) facing away from the winding core (12) contacts the side plate (112).

3. The battery cell according to claim 1, characterized in that In the radial direction (D1) of the battery core, the thickness (b1) of the shock-absorbing ring (15) is less than or equal to the distance (b2) between the winding core (12) and the side plate (112).

4. The battery cell according to claim 1, characterized in that The battery cell further comprises: a negative electrode insulation pad (16), the negative electrode insulation pad (16) being located between the winding core (12) and the bottom plate (111), and the outer edge of the negative electrode insulation pad (16) being connected to the shock absorbing ring (15).

5. The battery cell according to claim 4, characterized in that: The shock-absorbing ring (15) is an annular plate body, the annular plate body extends along the circumference of the winding core (12), and the side of the annular plate body facing the bottom plate (111) is connected to the outer edge of the negative electrode insulating pad (16); Alternatively, the shock-absorbing ring (15) includes a plurality of arc-shaped plates (151), and the plurality of arc-shaped plates (151) are distributed around the periphery of the winding core (12), and the side of each arc-shaped plate (151) facing the bottom plate (111) is connected to the outer edge of the negative electrode insulation pad (16).

6. The battery cell according to claim 4 or 5, characterized in that: The negative electrode insulating pad (16) and the shock absorbing ring (15) are an integrated structure.

7. The battery cell according to any one of claims 1 to 5, characterized in that: A chamfered structure (R1) is provided at a connection between a side of the shock-absorbing ring (15) facing the winding core (12) and a side of the shock-absorbing ring (15) facing away from the bottom plate (111).

8. The battery cell according to claim 7, characterized in that: The chamfer angle (α1) of the chamfer structure (R1) is negatively correlated with the height (h1) of the shock-absorbing ring (15) in the axial direction (D2) of the battery core.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The battery core further includes an adhesive layer (17), the adhesive layer (17) being located between the shock absorbing ring (15) and the side plate (112), and the adhesive layer (17) being bonded to the shock absorbing ring (15) and the side plate (112) respectively.

10. A battery module, characterized in that: The battery module comprises: a plurality of connected battery cells, each of which is a battery cell according to any one of claims 1 to 9.

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