Battery cell and battery

Abstract

The utility model provides a battery cell and a battery. The battery cell comprises a pole piece structure and at least one tab structure, according to the technical scheme of the utility model, the through hole in each tab body is communicated with the guide groove, and the gap for communicating the guide grooves in the two tab bodies is formed between the two tab bodies, so that the through hole in the two adjacent tab bodies is communicated with the guide grooves in the two tab bodies, and the through hole in the two adjacent tab bodies is communicated with the guide grooves in the two tab bodies. Cooling liquid can enter the gap from the guide groove of one tab body and the through hole, further flows to the guide groove in the other tab body and flows out from the guide groove in the other tab body, so that the cooling liquid in the plurality of tab bodies can flow out from the guide groove in the other tab body, and the cooling liquid in the plurality of tab bodies can flow out from the guide groove in the other tab body. And the cooling liquid flows among the plurality of tab bodies along the flowing path, so that the speed of the electrolyte entering the pole piece structure from the tab structure is accelerated, and the infiltration effect of the electrolyte is improved.

Description

Technical Field

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

[0002] In the related technologies, lithium-ion batteries have been widely used in the field of new energy due to their advantages such as high energy density, no memory effect, and environmental protection. In the current new energy industry, the demand for battery capacity is constantly increasing, and increasing battery capacity can effectively solve the problem of vehicle endurance. At present, in order to increase battery capacity, the number of pole pieces is increased in the same battery size to increase battery capacity. However, the increase in the number of pole piece layers will increase the number of pole ear layers simultaneously, resulting in a decrease in the gap between adjacent pole ears. At this time, the speed at which the electrolyte enters the pole piece from the pole ear will decrease, affecting the electrolyte infiltration effect. Utility Model Content

[0003] The embodiments of the utility model provide a battery cell and a battery, which can improve the technical problem that the number of tab layers increases in the same space due to the increase in battery capacity, thereby reducing the gap between the tabs and affecting the speed at which the electrolyte enters the pole piece from the tab.

[0004] In a first aspect, an embodiment of the present utility model provides a battery cell, comprising:

[0005] A pole piece structure, comprising a plurality of pole piece bodies stacked along a first direction, wherein the pole piece bodies include a connection end in a second direction intersecting the first direction; and

[0006] At least one pole lug structure, comprising a plurality of pole lug bodies, the plurality of pole lug bodies corresponding to the plurality of pole piece bodies one by one, the pole lug bodies extending from the connecting ends of the corresponding pole piece bodies, the pole lug bodies being bent along the first direction and stacked along the second direction, and at least parts of any two adjacent pole lug bodies being spaced apart from each other to form a gap;

[0007] The tab body is provided with at least one guide groove, which is formed concavely toward the inside of the tab body along the second direction and extends along the first direction; the tab body is also provided with a through hole penetrating the tab body along the second direction, and the through hole is connected with the guide groove;

[0008] On any two adjacent tab bodies, the guide groove on one tab body is connected to the guide groove on the other tab body through the through hole and the gap between the two tab bodies.

[0009] In one embodiment, a plurality of guide grooves are provided on each of the tab bodies, and the plurality of guide grooves are arranged at intervals along a third direction; wherein the first direction is perpendicular to the second direction, and the third direction intersects the second direction and is perpendicular to the first direction;

[0010] A plurality of through holes are provided on each of the tab bodies, and the plurality of through holes are respectively connected to the plurality of guide grooves.

[0011] In one embodiment, the battery cell further includes a first protective layer, which is disposed on one side of the plurality of tab bodies in the second direction, and at least a portion of the first protective layer covers adjacent tab bodies;

[0012] The first protection layer is also provided with a plurality of via holes extending along the second direction, and the plurality of via holes are respectively connected to the plurality of through holes.

[0013] In one embodiment, the battery cell further includes a second protective layer, which is disposed on one side of the plurality of tab bodies in the second direction, and at least a portion of the second protective layer covers adjacent tab bodies;

[0014] The second protective layer is also provided with a groove extending along the second direction, and the groove is connected to the plurality of through holes.

[0015] In one embodiment, each of the tab bodies includes a fixing portion, and the two fixing portions on two adjacent tab bodies are fixed to each other;

[0016] In the first direction, the through hole located on the tab body is located between the fixing portion of the tab body and the connection between the tab body and the pole piece body.

[0017] In one embodiment, at least some of the through holes on the tab bodies are staggered in the second direction.

[0018] In one embodiment, the plurality of through holes located on the plurality of tab bodies are arranged opposite to each other in the second direction.

[0019] In one embodiment, on a tab body, the depth of the guide groove on the tab body in the second direction is defined as L1, and the thickness of the area of ​​the tab body not provided with the guide groove in the second direction is defined as L2; ​​wherein L1 and L2 satisfy: L1>L2.

[0020] In one embodiment, a cross section of the through hole on a plane perpendicular to the second direction is polygonal or circular.

[0021] In a second aspect, an embodiment of the present invention provides a battery, comprising the battery cell as described above.

[0022] Beneficial effects of the embodiments of the utility model:

[0023] In the technical solution of the utility model, the electrolyte injected into the battery enters between the plurality of the pole lug bodies from the through hole on one of the pole lug bodies away from the pole piece structure in the second direction Z. Since the through hole on each of the pole lug bodies is connected to the guide groove, and there is a gap between the two pole lug bodies that connects the guide grooves on the two pole lug bodies, in two adjacent pole lug bodies, the cooling liquid can enter into the gap from the guide groove and the through hole of one pole lug body, and further flow to the guide groove on the other pole lug body, and flow out from the guide groove on the other pole lug body. Therefore, in the plurality of pole lug bodies, the cooling liquid flows between the plurality of pole lug bodies along the above-mentioned flow path, thereby accelerating the speed at which the electrolyte enters from the pole lug structure to the pole piece structure, and improving the infiltration effect of the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the assembly of a pole ear structure and a pole piece structure provided by an embodiment of the utility model;

[0026] Figure 2 It is a cross-sectional schematic diagram of a tab structure provided by an embodiment of the utility model;

[0027] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0028] Figure 4 is a cross-sectional schematic diagram of a pole ear structure provided by another embodiment of the utility model;

[0029] Figure 5 is a cross-sectional schematic diagram of a pole ear structure provided by another embodiment of the utility model;

[0030] Figure 6 is a cross-sectional schematic diagram of a tab structure provided by an embodiment of the utility model from another perspective;

[0031] Figure 7is a cross-sectional schematic diagram of a tab structure provided by another embodiment of the utility model from another viewing angle;

[0032] Figure 8 It is a schematic structural diagram of the assembled pole ear structure and pole piece structure provided by one embodiment of the utility model;

[0033] Fig. 9 It is a cross-sectional schematic diagram of a tab body provided by an embodiment of the utility model;

[0034] Fig.10 It is a three-dimensional schematic diagram of a battery cell provided by an embodiment of the utility model, in which a first protective layer is covered on the tab structure;

[0035] Fig.11 It is a cross-sectional schematic diagram of a pole ear structure after the pole ear structure provided by an embodiment of the utility model is covered with a first protective layer;

[0036] Fig.12 It is a three-dimensional schematic diagram of a battery cell provided by an embodiment of the utility model, in which a second protective layer is covered on the tab structure;

[0037] Fig.13 It is a cross-sectional schematic diagram of a pole ear structure after the pole ear structure provided by an embodiment of the utility model is covered with a second protective layer;

[0038] Fig.14 It is a cross-sectional schematic diagram of a tab structure provided by an embodiment of the utility model;

[0039] Fig.15 is a cross-sectional schematic diagram of a pole ear structure provided by another embodiment of the utility model;

[0040] Fig.16 It is a cross-sectional schematic diagram of a pole ear structure provided by another embodiment of the utility model.

[0041] Reference numerals:

[0042] 100. Battery cell; 1. Pole piece structure; 11. Pole piece body; 2. Pole tab structure; 21. Pole tab body; 3. Guide groove; 4. Through hole; 5. First protective layer; 6. Via hole; 7. Second protective layer; 8. Slot; 21A. Fixing part; 9. Welding part; 11A. Connecting end; 10. Gap; 211. First surface; 212. Second surface. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0044] In the related technologies, lithium-ion batteries have been widely used in the field of new energy due to their advantages such as high energy density, no memory effect, and environmental protection. In the current new energy industry, the demand for battery capacity is constantly increasing, and increasing battery capacity can effectively solve the problem of vehicle endurance. At present, in order to increase battery capacity, the number of pole pieces is increased in the same battery size to increase battery capacity. However, the increase in the number of pole piece layers will increase the number of pole ear layers simultaneously, resulting in a decrease in the gap between adjacent pole ears. At this time, the speed at which the electrolyte enters the pole piece from the pole ear will decrease, affecting the electrolyte infiltration effect.

[0045] In view of this, the utility model provides a battery cell. Figures 1 to 16 Some embodiments of the present utility model are shown below. Figure 1 As shown, the Y direction is the first direction, the Z direction is the second direction, and the X direction is the third direction; the second direction Z is perpendicular to the third direction X and the first direction Y respectively, and the first direction intersects with the third direction.

[0046] See also Figure 1 The battery cell 100 includes a pole piece structure 1 and at least one pole ear structure 2 , wherein the pole ear structure 2 is located at one end of the pole piece structure 1 and connected to the pole piece structure 1 .

[0047] The pole piece structure 1 includes a plurality of pole piece bodies 11 stacked along a first direction Y. In some embodiments, the plurality of pole piece bodies 11 are integrally formed and wound together to form the pole piece structure 1. In other embodiments, the plurality of pole piece bodies 11 exist independently, and two adjacent pole piece bodies 11 are not connected.

[0048] In some embodiments, the pole piece body 11 includes a connecting end 11A, and the pole ear structure 2 is located on the connecting end 11A of the pole piece structure 1 .

[0049] The pole ear structure 2 includes a plurality of pole ear bodies 21, and the plurality of pole ear bodies 21 correspond one by one to the plurality of pole piece bodies 11. The pole ear bodies 21 extend from the connecting ends 11A of the corresponding pole piece bodies 11, and the pole ear bodies 21 are bent along the first direction Y and stacked along the second direction Z, wherein the bent pole ear bodies 21 do not contact the connecting ends 11A of the pole piece bodies 11 in the first direction Y.

[0050] See also Figures 2 to 3 , at least parts of any two adjacent pole ear bodies 21 are spaced from each other to form a gap 10; wherein the pole ear body 21 includes a first surface 211 and a second surface 212 arranged opposite to each other in the second direction Z, one of the first surface 211 and the second surface 212 is far away from the pole piece body 11, and the other is close to the pole piece body 11. In one embodiment of the present application, the first surface 211 is far away from the pole piece body 11, and the pole ear body 21 is recessed from the first surface 211 to the second surface 212 to form at least one guide groove 3, and the guide groove 3 is recessed toward the inside of the pole ear body 21 along the second direction Z and extends along the first direction Y; the pole ear body 21 is also provided with a through hole 4 that penetrates the pole ear body 21 along the second direction Z, and the through hole 4 is located on the groove wall of the guide groove 3 so that the through hole 4 is connected to the guide groove 3.

[0051] On any two adjacent tab bodies 21, the guide groove 3 on one tab body 21 is connected to the guide groove 3 on the other tab body 21 through the through hole 4 and the gap 10 between the two tab bodies 21. That is, on the basis of providing a plurality of tab bodies 21, the gaps 10 between adjacent tab bodies 21 are all connected to each other.

[0052] In the technical solution of the utility model, the electrolyte injected into the battery enters between the plurality of the pole lug bodies 21 from the through hole 4 on one of the pole lug bodies 21 away from the pole piece structure 1 in the second direction Z. Since the through hole 4 on each of the pole lug bodies 21 is connected to the guide groove 3, and there is a gap 10 between the two pole lug bodies 21 that connects the guide grooves 3 on the two pole lug bodies 21, in two adjacent pole lug bodies 21, the cooling liquid can enter into the gap 10 from the guide groove 3 and the through hole 4 of one pole lug body 21, and further flow to the guide groove 3 on the other pole lug body 21, and flow out from the guide groove 3 on the other pole lug body 21. Therefore, in the plurality of the pole lug bodies 21, the cooling liquid flows between the plurality of the pole lug bodies 21 along the above-mentioned flow path, thereby accelerating the speed at which the electrolyte enters from the pole lug structure 2 to the pole piece structure 1, and improving the infiltration effect of the electrolyte.

[0053] See also Figure 4 In another embodiment of the present application, the first surface 211 is close to the pole piece body, and the pole ear body 21 is recessed from the first surface 211 to the second surface 212 to form at least one guide groove 3; that is, in this embodiment, the recessed direction of the guide groove in the second direction Z is opposite to the recessed direction of the guide groove 3 when the first surface 211 is away from the pole piece body 11 in the above embodiment. However, both embodiments have the same technical effect, which can accelerate the speed of the electrolyte entering from the pole ear structure 2 to the pole piece structure 1 and improve the infiltration effect of the electrolyte.

[0054] In addition, since the battery cell 100 has a positive electrode and a negative electrode, in an embodiment of the present application, two tab structures 2 are provided.

[0055] It can be understood that since the pole ear body 21 is bent along the first direction Y and the guide groove 3 extends along the first direction Y, on the basis of the two pole ear bodies 21 arranged on the two adjacent pole piece bodies 11 being stacked on each other, when the electrolyte flows to the gap 10 between the two pole ear bodies 21, a part of the electrolyte can flow along the extension direction of the guide groove 3 on one of the pole ear bodies 21 to between the two pole piece bodies 11, and another part of the electrolyte will flow out from the through hole 4 on the guide groove 3, and then flow into the guide grooves 3 of multiple pole ear bodies 21 in sequence.

[0056] See also Figure 2In one embodiment of the present application, the plurality of guide grooves 3 on the plurality of the tab bodies 21 are arranged opposite to each other in the second direction Z. That is, in this embodiment, the guide grooves 3 on two adjacent tab bodies 21 are opposite to each other in the second direction Z, so that when the electrolyte enters between the two tab bodies 21 from the through hole 4 on one tab body 21, it can directly enter the guide groove 3 on the other tab body 21, thereby increasing the infiltration speed of the electrolyte in the tab structure 2, and further accelerating the speed at which the electrolyte enters the pole piece structure 1.

[0057] See also Figure 5 In another embodiment of the present application, at least part of the plurality of guide grooves 3 located on the plurality of the tab bodies 21 are staggered in the second direction Z. That is, in this embodiment, the plurality of guide grooves 3 located in the tab structure 2 do not need to ensure that they all correspond in the second direction Z, and the effect of accelerating the infiltration speed of the electrolyte can still be achieved. The two tab bodies 21 are stacked in the second direction Z for illustration, and the two tab bodies 21 are divided into a first tab body and a second tab body for easy distinction. The electrolyte enters the gap 10 between the first tab body and the second tab body from the through hole 4 on the first tab body. Since the guide groove on the second tab body does not correspond to the guide groove of the first tab body in the second direction Z, the electrolyte entering between the first tab body and the second tab body will flow along the gap 10 between the first tab body and the second tab body, and then flow to the guide groove 3 of the second tab body, that is, the gap 10 between the first tab body and the second tab body can also play the effect of guiding the electrolyte to flow to the guide groove 3.

[0058] See also Figure 6 , the multiple through holes 4 on the multiple tab bodies 21 are arranged relatively in the second direction Z. That is, in this embodiment, after the multiple tab bodies 21 are bent along the first direction Y, the multiple through holes 4 on the multiple tab bodies 21 are arranged relatively in the second direction Z according to the actual production setting, so that when the coolant flows between two adjacent tab bodies 21, part of the coolant can flow directly from the through hole 4 on one tab body 21 to the through hole 4 on another tab body 21, thereby increasing the flow speed of the electrolyte in the multiple tab bodies 21.

[0059] See also Figure 7, at least part of the plurality of through holes 4 on the plurality of tab bodies 21 are staggered in the second direction Z. That is, in this embodiment, since the plurality of tab bodies 21 are bent along the first direction Y to be stacked along the second direction Z, it is not easy to ensure that the through hole 4 on each tab body 21 is opposite to the through hole 4 on another adjacent tab body 21 in the second direction Z. However, since there is the gap 10 between the two adjacent tab bodies 21, the two through holes 4 on the two adjacent tab bodies 21 can be connected to each other through the gap 10, so that the flow speed of the electrolyte in the plurality of tab bodies 21 is increased.

[0060] See also Figure 1 as well as Figures 6 to 8 , each of the tab bodies 21 includes a fixing portion 21A, and the two fixing portions 21A on two adjacent tab bodies 21 are fixed to each other; in the first direction Y, the through hole 4 is located between the fixing portion 21A and the connection between the tab body 21 and the pole piece body 11. In this embodiment, in order to fix the plurality of tab bodies 21 to each other, the fixing portion 21A on each of the tab bodies 21 is fixed, and since there is no gap between the two fixing portions 21A on two adjacent tab bodies 21, in order to prevent the fixing portion 21A from affecting the effect of the guide groove 3 transporting the electrolyte to the pole piece structure 1 along the first direction Y, the through hole 4 on one of the tab bodies 21 is arranged between the fixing portion 21A and the connection between the tab body 21 and the pole piece body 11.

[0061] Specifically, two adjacent fixing portions 21A are welded to each other. Figure 6 and Figure 7 As shown, a welding portion 9 is provided between the fixing portions 21A on two adjacent tab bodies 21, that is, the fixing portions 21A on the two tab bodies 21 are welded and fixed by the welding portion 9; in one embodiment of the present application, the welding portion 9 may be composed of a part of the fixing portions 21A of the two adjacent tab bodies 21; in another embodiment of the present application, the welding portion 9 is provided independently of the two tab bodies 21.

[0062] It should be noted that, since the thickness L2 of the tab body 21 in the second direction Z is relatively thin, the tab body 21 is deformed by rolling to form the guide groove 3. Fig. 9In one embodiment of the present application, on a tab body 21, the depth of the guide groove 3 on the tab body 21 in the second direction Z is defined as L1, and the thickness of the area of ​​the tab body 21 where the guide groove 3 is not provided is defined as L2; ​​wherein L1 and L2 satisfy: L1>L2. That is, the depth L1 of the guide groove 3 formed by rolling in the second direction Z is greater than the thickness L2 of the tab body 21 in the second direction Z. Since the through hole 4 is also located in the area where the guide groove 3 is located, that is, it is opened on the groove wall of the guide groove 3, in order to facilitate processing, the through hole 4 can be formed while the guide groove 3 is formed by rolling.

[0063] Based on the above technical solution of forming the guide groove 3 by rolling the tab body 21 to deform it, in another embodiment of the present application, the groove depth L1 of the guide groove is less than the thickness L2 of the tab body; in another embodiment of the present application, the groove depth L1 of the guide groove is equal to the thickness L2 of the tab body.

[0064] It can be understood that, the greater the groove depth L1 of the guide groove, the greater the flow rate of the coolant in the guide groove.

[0065] In some embodiments of the present application, on each of the tab bodies 21, a plurality of guide grooves 3 are provided, and the plurality of guide grooves 3 are arranged at intervals along the third direction X; on each of the tab bodies 21, a plurality of through holes 4 are provided, and the plurality of through holes 4 are respectively connected to the plurality of guide grooves 3. That is, in this embodiment, by providing a plurality of guide grooves 3, the flow rate of the electrolyte passing into the space between two adjacent tab bodies 21 can be accelerated. Thereby, the speed of the electrolyte entering the pole piece structure 1 from the tab structure 2 is further improved.

[0066] See also Figure 10 to Figure 11In one embodiment of the present application, the battery cell 100 further includes a first protective layer 5, which is disposed on one side of the plurality of tab bodies 21 in the second direction Z, and at least part of the first protective layer 5 covers the adjacent tab bodies 21; the first protective layer 5 is also provided with a plurality of vias 6 extending along the second direction Z, and the plurality of vias 6 are respectively connected to the plurality of through holes 4 on the adjacent tab bodies 21. That is, in this embodiment, the first protective layer 5 is further provided on the opposite sides of the plurality of tab bodies 21 in the second direction Z, and the first protective layer 5 is used to insulate and space the pole piece structure 1 and the tab structure 2, and the pole piece structure 1 and the battery cover plate. In order to prevent the first protective layer 5 from affecting the infiltration effect of the electrolyte, the first protective layer 5 is further provided with a plurality of vias 6, and the plurality of vias 6 are respectively connected to the plurality of through holes 4 on the tab body 21 that are mutually attached to the first protective layer 5.

[0067] See also Figure 12 to Figure 13 In another embodiment of the present application, the battery cell 100 further includes a second protective layer 7, which is disposed on one side of the plurality of tab bodies 21 in the second direction Z, and at least part of the second protective layer 7 covers the adjacent tab bodies 21; the second protective layer 7 is also provided with a slot 8 extending along the second direction Z, and the slot 8 is connected to the plurality of through holes 4 on the adjacent tab bodies 21. That is, in this embodiment, the second protective layer 7 is further provided on the opposite sides of the plurality of tab bodies 21 in the second direction Z, and the second protective layer 7 is used to insulate and space the pole piece structure 1 and the tab structure 2, and the pole piece structure 1 and the battery cover plate. In order to prevent the second protective layer 7 from affecting the infiltration effect of the electrolyte, the second protective layer 7 is further provided with the slot 8, and the slot 8 is connected to the plurality of through holes 4 on the tab body 21 that are mutually attached to the second protective layer 7.

[0068] See also Figures 14 to 16 , the cross section of the through hole 4 on the plane perpendicular to the second direction Z is polygonal or circular. In this embodiment, the shape of the through hole 4 is not limited, and can be one of a triangle, a circle or a rectangle. The size of the through hole 4 is also not limited, and can be beyond the setting range of the guide groove 3 or within the setting range of the guide groove 3.

[0069] The utility model also provides a battery, which includes a battery cell 100. The battery cell 100 is as described above. Since the battery adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0070] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery cell, characterized in that: include: A pole piece structure, comprising a plurality of pole piece bodies stacked along a first direction, wherein the pole piece bodies include a connection end in a second direction intersecting the first direction; as well as, At least one pole lug structure, comprising a plurality of pole lug bodies, the plurality of pole lug bodies corresponding to the plurality of pole piece bodies one by one, the pole lug bodies extending from the connecting ends of the corresponding pole piece bodies, the pole lug bodies being bent along the first direction and stacked along the second direction, and at least parts of any two adjacent pole lug bodies being spaced apart from each other to form a gap; The tab body is provided with at least one guide groove, which is formed concavely toward the inside of the tab body along the second direction and extends along the first direction; the tab body is also provided with a through hole penetrating the tab body along the second direction, and the through hole is connected with the guide groove; On any two adjacent tab bodies, the guide groove on one tab body is connected to the guide groove on the other tab body through the through hole and the gap between the two tab bodies.

2. The battery cell according to claim 1, characterized in that: On each of the tab bodies, a plurality of guide grooves are provided, and the plurality of guide grooves are arranged at intervals along a third direction; wherein the first direction is perpendicular to the second direction, and the third direction intersects with the second direction and is perpendicular to the first direction; A plurality of through holes are provided on each of the tab bodies, and the plurality of through holes are respectively connected to the plurality of guide grooves.

3. The battery cell according to claim 2, characterized in that: The battery core further includes a first protective layer, which is disposed on one side of the plurality of tab bodies in the second direction, and at least a portion of the first protective layer covers adjacent tab bodies; The first protective layer is also provided with a plurality of via holes extending along the second direction, and the plurality of via holes are respectively connected to the plurality of through holes on the adjacent tab bodies.

4. The battery cell according to claim 2, characterized in that: The battery core further includes a second protective layer, which is disposed on one side of the plurality of tab bodies in the second direction, and at least a portion of the second protective layer covers the adjacent tab bodies; The second protective layer is also provided with a slot extending along the second direction, and the slot is connected to the plurality of through holes on the adjacent tab bodies.

5. The battery cell according to claim 1, characterized in that: Each of the tab bodies includes a fixing portion, and the two fixing portions on two adjacent tab bodies are fixed to each other; In the first direction, the through hole located on the tab body is located between the fixing portion of the tab body and the connection between the tab body and the pole piece body.

6. The battery cell according to any one of claims 1 to 5, characterized in that: At least some of the through holes on the tab bodies are staggered in the second direction.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The plurality of through holes located on the plurality of tab bodies are arranged opposite to each other in the second direction.

8. The battery cell according to any one of claims 1 to 5, characterized in that: On one of the tab bodies, the depth of the guide groove on the tab body in the second direction is defined as L1, and the thickness of the area of ​​the tab body not provided with the guide groove in the second direction is defined as L2; ​​wherein L1 and L2 satisfy: L1>L2.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The cross section of the through hole on a plane perpendicular to the second direction is polygonal or circular.

10. A battery, characterized in that: Comprising the battery cell as claimed in any one of claims 1 to 9.

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