Battery cell

Abstract

The utility model relates to the technical field of battery cells, in particular to a battery cell which comprises a positive pole and a negative pole, wherein the positive pole comprises a first riveting part and a first over-current part which are connected with each other, the negative pole comprises a second riveting part and a second over-current part which are connected with each other, and the cross sections, perpendicular to a first preset direction, of the first over-current part, the first riveting part and the second over-current part are non-circular cross sections; the size of the non-circular section in the length direction of the cover plate of the corresponding battery cell is larger than the size of the non-circular section in the width direction of the cover plate of the battery cell, and the cross section, perpendicular to the first preset direction, of the second riveting part is a circular section. According to the battery cell provided by the invention, the shape of the battery cell is designed according to the respective characteristics and requirements of the positive pole and the negative pole, and the over-current capability is improved to the greatest extent while the riveting effect is met.

Description

Technical Field

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

[0002] At present, the positive and negative poles of the battery cell are made of different materials. The positive pole is copper and the negative pole is aluminum. The hardness of aluminum is lower than that of copper and it is relatively easy to deform, so riveting is easier. The material of copper is harder than aluminum and relatively not easy to deform, so riveting is difficult. At present, there is no distinction between the structures of the two poles of different materials. They are all designed to have the same shape. Most of them are cylindrical structures. For the negative pole made of copper, this can ensure that the force around the negative pole is uniform during riveting, the riveting effect is good, and it is more convenient to rivet. However, for the positive pole, its material is relatively soft and easy to rivet, so it does not need to be designed into the aforementioned cylindrical shape. In addition, due to the limitation of the width of the cover plate, the diameter of the pole is also easily limited, resulting in the cross-sectional area of ​​the pole cannot be increased arbitrarily, and thus cannot meet higher overcurrent capacity. Utility Model Content

[0003] The purpose of this application is to provide a battery cell that, to a certain extent, solves the technical problem in the prior art of how to maximize the current capacity of the poles while ensuring that both the positive and negative poles of the battery cell have good riveting effects.

[0004] The present application provides a battery cell, comprising: a positive electrode post and a negative electrode post; wherein the positive electrode post comprises a first riveted portion and a first current-passing portion connected to each other, and the negative electrode post comprises a second riveted portion and a second current-passing portion connected to each other, and the cross-sections of the first current-passing portion, the first riveted portion and the second current-passing portion perpendicular to a first preset direction are all non-circular cross-sections, and the size of the non-circular cross-section in the length direction of the corresponding battery cell cover is greater than the size in the width direction of the battery cell cover, and the cross-section of the second riveted portion perpendicular to the first preset direction is a circular cross-section.

[0005] In the above technical solution, further, along a first preset direction and from the inside of the battery core toward the outside thereof, the first current-passing portion and the first riveted portion form an ascending two-stage step-like structure.

[0006] In any of the above technical solutions, further, the maximum dimension of the first flow-through portion in the length direction of the cover plate is d, the maximum dimension of the first riveted portion in the length direction of the cover plate is f, and d>f.

[0007] In any of the above technical solutions, further, the maximum dimension of the first flow-through portion in the width direction of the cover plate is c, the maximum dimension of the first riveted portion in the width direction of the cover plate is e, and c>e.

[0008] In any of the above technical solutions, further, the positive electrode column also includes a first pole tab connection portion, and the first pole tab connection portion is connected to the end of the first current flow portion away from the first riveted portion, and along a direction perpendicular to the first preset direction, the cross-sectional area of ​​the first pole tab connection portion is respectively larger than the cross-sectional area of ​​the first current flow portion and the first riveted portion.

[0009] In any of the above technical solutions, further, along the first preset direction and from the inside of the battery core toward the outside thereof, the second current overflow portion and the second riveted portion form an ascending two-stage step-like structure.

[0010] In any of the above technical solutions, further, the maximum dimension of the second flow portion in the length direction of the cover plate is i, the maximum dimension of the second flow portion in the width direction of the cover plate is j, the circular cross-section of the second riveted portion has a diameter of m, and i>j>m.

[0011] In any of the above technical solutions, further, the positive electrode column also includes a second pole tab connection portion, and the second pole tab connection portion is connected to the end of the second current flow portion away from the second riveted portion, and along a direction perpendicular to the first preset direction, the cross-sectional area of ​​the second pole tab connection portion is respectively larger than the cross-sectional area of ​​the second current flow portion and the second riveted portion.

[0012] In any of the above technical solutions, further, the battery cell includes a shell and a cover; wherein, along the first preset direction, the cover is installed at the opening of one end of the shell, and the positive electrode column and the negative electrode column are installed on the same cover.

[0013] In any of the above technical solutions, further, the battery cell includes a shell and a cover; wherein, along the first preset direction, cover plates are installed at the openings at both ends of the shell, one of the positive electrode column and the negative electrode column is installed on one of the two cover plates, and the other of the positive electrode column and the negative electrode column is installed on the other of the two cover plates.

[0014] In any of the above technical solutions, further, along a direction perpendicular to the first preset direction, the cross sections of the first riveted portion, the first flow-through portion, and the second flow-through portion are all waist-shaped cross sections.

[0015] In any of the above technical solutions, further, the material of the positive electrode column is aluminum.

[0016] In any of the above technical solutions, further, the negative electrode column is made of copper.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The battery cell provided in the present application has different shapes for the positive electrode and the negative electrode. The first riveted portion of the positive electrode made of copper is designed to be cylindrical, that is, the cross-section is circular. During riveting, the negative electrode is subjected to uniform force around the circumference, the riveting effect is good, and the riveted structure is stronger and more stable. While ensuring the riveting effect, the first current-passing portion below the first riveted portion that does not participate in the riveting is designed to be non-cylindrical, that is, the cross-section is non-circular, and its size in the length direction of the cover plate is larger than its size in the width direction of the cover plate, thereby greatly improving the current-passing capacity within a limited space.

[0019] In addition, the negative electrode pole made of aluminum has low riveting requirements, so the second riveted part and the second current-passing part on it can be designed as a non-cylindrical structure, that is, a structure with a non-circular cross-section. While ensuring the riveting quality, the current-passing capacity is greatly improved in a limited space.

[0020] It can be seen that the battery cell provided in the present application is designed in accordance with the respective characteristics and requirements of the positive electrode post and the negative electrode post, thereby maximizing the current carrying capacity while satisfying the riveting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 An exploded view of a battery cell provided in an embodiment of the present application;

[0023] Figure 2 Another exploded view of the battery cell provided in an embodiment of the present application;

[0024] Figure 3 An exploded view of the first cover portion provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of the positive electrode column provided in an embodiment of the present application;

[0026] Figure 5Another structural schematic diagram of the positive electrode column provided in an embodiment of the present application;

[0027] Figure 6 Another structural schematic diagram of the positive electrode column provided in an embodiment of the present application;

[0028] Figure 7 An assembly diagram of the first cover plate portion provided in an embodiment of the present application;

[0029] Figure 8 for Figure 7 Cross-sectional view along section AA;

[0030] Figure 9 for Figure 8 A schematic diagram of the enlarged structure at B;

[0031] Figure 10 An exploded view of the second cover portion provided in an embodiment of the present application;

[0032] Figure 11 A schematic diagram of the structure of the negative electrode column provided in an embodiment of the present application;

[0033] Figure 12 Another schematic diagram of the structure of the negative electrode provided in an embodiment of the present application;

[0034] Figure 13 Another structural schematic diagram of the negative electrode column provided in an embodiment of the present application;

[0035] Figure 14 An assembly diagram of the second cover portion provided in an embodiment of the present application;

[0036] Figure 15 for Figure 14 Cross-sectional view along CC section;

[0037] Figure 16 for Figure 15 Schematic diagram of the enlarged structure at D.

[0038] Reference numerals:

[0039] 1-positive electrode post, 101-first riveted part, 102-first current flow part, 103-first tab connection part, 2-negative electrode post, 201-second riveted part, 202-second current flow part, 203-second tab connection part, 3-housing, 4-first cover plate, 5-first riveted block, 6-first plastic part, 7-second plastic part, 8-first sealing ring, 9-second cover plate, 10-second riveted block, 11-third plastic part, 12-fourth plastic part, 13-second sealing ring. DETAILED DESCRIPTION

[0040] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0042] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] Refer to the following Figures 1 to 16 The battery cell according to some embodiments of the present application is described.

[0046] Example 1

[0047] See also Figures 1 to 16As shown, an embodiment of the present application provides a battery cell, comprising: a positive electrode column 1 and a negative electrode column 2; wherein, the positive electrode column 1 comprises a first rivet portion 101 and a first current-passing portion 102 connected to each other, and the negative electrode column 2 comprises a second rivet portion 201 and a second current-passing portion 202 connected to each other, and the cross-section of the second rivet portion 201 perpendicular to the first preset direction a is a circular cross-section, and the cross-sections of the first current-passing portion 102, the first rivet portion 101 and the second current-passing portion 202 perpendicular to the first preset direction a are all non-circular cross-sections, and the size of the non-circular cross-section in the length direction of the corresponding battery cell cover is greater than the size in the width direction of the battery cell cover.

[0048] That is to say, the maximum dimension f of the first riveted portion 101 in the length direction of the first cover plate 4, the maximum dimension e of the first riveted portion 101 in the width direction of the first cover plate 4, and f>e; the maximum dimension d of the first flow-through portion 102 in the length direction of the first cover plate 4, the maximum dimension c of the first flow-through portion 102 in the width direction of the first cover plate 4, and d>c.

[0049] According to the structure described above, the battery cell provided in the present application has different shapes of the positive electrode 1 and the negative electrode 2. The first riveted portion 101 of the positive electrode 1 made of copper is designed to be cylindrical, that is, the cross-section is circular. During riveting, the negative electrode 2 is subjected to uniform force around the circle, the riveting effect is good, and the riveted structure is firmer and more stable. While ensuring the riveting effect, the first current-passing portion 102 below the first riveted portion 101 that does not participate in the riveting is designed to be non-cylindrical, that is, the cross-section is non-circular, and its size in the length direction of the cover plate is larger than its size in the width direction of the cover plate, which greatly improves the current-passing capacity within a limited space.

[0050] In addition, the negative electrode pole 2 made of aluminum has low requirements for riveting, so the second riveted part 201 and the second current-passing part 202 thereon can be designed as a non-cylindrical structure, that is, a structure with a non-circular cross-section. While ensuring the riveting quality, the current-passing capacity is greatly improved in a limited space.

[0051] It can be seen that the battery cell provided in the present application is designed in accordance with the respective characteristics and requirements of the positive electrode post 1 and the negative electrode post 2 , thereby maximizing the current carrying capacity while satisfying the riveting effect.

[0052] Furthermore, preferably, the battery cell further includes: a housing 3 and a cover plate; wherein, along the first preset direction a, the housing 3 is provided with a cover plate installed at both end openings. To facilitate distinguishing the two covers at different positions, they are respectively named as a first cover plate 4 and a second cover plate 9. The positive electrode post 1 is installed on the first cover plate 4, and the negative electrode post 2 is installed on the second cover plate 9. Of course, this is not limited to this, and the positive electrode post 1 and the negative electrode post 2 can also be installed on the same cover plate at the same time. The specific configuration is selected according to actual needs.

[0053] Further, preferably, along the first preset direction a, the first cover plate 4 is formed with a first mounting through hole running through the inner and outer sides thereof; wherein the first flow-through portion 102 is installed in the first mounting through hole, and the cross section of the first flow-through portion 102 along the direction perpendicular to the first preset direction a is a non-circular cross section; the first rivet portion 101 is arranged on the outer side of the first cover plate 4, and the first pole ear connection portion 103 is arranged on the inner side of the first cover plate 4.

[0054] Furthermore, preferably, the battery cell also includes a first rivet block 5 and a first plastic part 6. The first rivet block 5 is sleeved on the outside of the first rivet portion 101 and riveted to the first rivet portion 101. At least part of the structure of the first plastic part 6 is arranged between the first rivet block 5 and the first cover plate 4 to play a role in adjusting the resistance, that is, to play a role in insulation protection. The second rivet portion 201 made of aluminum and the first cover plate 4 must meet "2-100000Ω" or "at a voltage of 500VDC, the resistance is 0.05-100MΩ (including the end points)". Of course, it is not limited to this.

[0055] Further, preferably, along the first preset direction a, the second cover plate 9 is formed with a second mounting through hole running through the inner and outer sides thereof; wherein the second flow-through portion 202 is installed in the second mounting through hole, and the cross section of the second flow-through portion 202 along the direction perpendicular to the first preset direction a is a non-circular cross section; the second rivet portion 201 is arranged on the outer side of the second cover plate 9, and the second pole ear connection portion 203 is arranged on the inner side of the second cover plate 9.

[0056] Furthermore, preferably, the battery cell also includes a second riveted block 10 and a third plastic part 11. The second riveted block 10 is sleeved on the outside of the second riveted portion 201 and riveted to the second riveted portion 201. At least part of the structure of the third plastic part 11 is arranged between the second riveted block 10 and the second cover plate 9 to play a role in adjusting the resistance, that is, to play a role in insulation protection. The second riveted portion 201 made of aluminum and the second cover plate 9 must meet the requirements of "resistance>200MΩ at 500VDC voltage, and current<2mA at 1000VDC voltage". Of course, it is not limited to this.

[0057] In this embodiment, preferably, Figures 4 to 6As shown, along the first preset direction a and from the inner side of the cover plate toward the outer side thereof, the first flow-through portion 102 and the first riveted portion 101 form an ascending two-stage step-like structure.

[0058] According to the structure described above, a mounting step surface is formed between the two steps of the two-step structure, which can be used to support the first riveted block 5 to prevent the first riveted block 5, such as the riveted aluminum block, from collapsing and deforming when the pole is riveted.

[0059] In this embodiment, preferably, Figure 5 and Figure 6 As shown, the maximum dimension of the first flow-through portion 102 in the length direction of the cover plate is d, the maximum dimension of the first riveted portion 101 in the length direction of the cover plate is f, and d>f.

[0060] Further, if Figures 1 to 3 As shown, the maximum dimension of the first flow-through portion 102 in the width direction of the cover plate is c, the maximum dimension of the first riveted portion 101 in the width direction of the cover plate is e, and c>e.

[0061] According to the structure described above, it can be seen that it is precisely because the maximum dimension d of the first overflow portion 102 in the length direction of the cover plate is greater than the maximum dimension f of the first riveted portion 101 in the length direction of the cover plate, and the maximum dimension c of the first overflow portion 102 in the width direction of the cover plate is greater than the maximum dimension e of the first riveted portion 101 in the width direction of the cover plate, that the aforementioned installation step surface is formed between the first overflow portion 102 and the first riveted portion 101.

[0062] It should be noted that: it is not limited to the aforementioned d>f, c>e, and d=f, c=e and so on can also be set.

[0063] In this embodiment, preferably, Figures 4 to 6 As shown, the positive electrode column 1 also includes a first tab connection portion 103, and the first tab connection portion 103 is connected to the end of the first current-passing portion 102 that is away from the first rivet portion 101, and along a direction perpendicular to the first preset direction a, the cross-sectional area of ​​the first tab connection portion 103 is respectively greater than the cross-sectional area of ​​the first rivet portion 101 and the first current-passing portion 102.

[0064] According to the structure described above, the area of ​​the cross section of the first tab connection portion 103 along the direction perpendicular to the first preset direction a is respectively larger than the area of ​​the cross section of the first rivet portion 101 and the first flow-through portion 102 along the direction perpendicular to the first preset direction a, which helps to improve the flow-through capacity and has sufficient contact and welding area with the tab, thereby improving the firmness and stability after welding.

[0065] In this embodiment, preferably, Figure 3and Figure 9 As shown, the battery cell also includes a second plastic part 7 and a first sealing ring 8; wherein, along the first preset direction a, the second plastic part 7 is arranged on the inner side of the first cover plate 4, that is, on the side close to the electrode group of the battery cell, and part of the structure of the second plastic part 7 extends to between the first pole ear connection part 103 and the first cover plate 4, playing a role of insulation protection; the first sealing ring 8 is sleeved on the outside of the first current flow portion 102, and part of the structure is located in the aforementioned first mounting through hole, and the other part of the structure is against the peripheral structure of the mounting through hole, playing a sealing role.

[0066] In this embodiment, preferably, Figures 1 to 3 As shown, along the first preset direction a and from the inside of the battery cell toward the outside thereof, the second current-passing portion 202 and the second riveted portion 201 form an ascending two-stage step-like structure.

[0067] According to the structure described above, a mounting step surface is formed between the two steps of the two-step structure, which can be used to support the second riveted block 10 to prevent the second riveted block 10, such as the riveted aluminum block, from collapsing and deforming when the pole is riveted.

[0068] In this embodiment, preferably, Figures 11 to 13 As shown, the maximum dimension of the second overflow portion 202 in the length direction of the second cover plate 9 is i, the maximum dimension of the second overflow portion 202 in the width direction of the second cover plate 9 is j, the circular cross-section of the second riveted portion 201 has a diameter of m, and i>j>m.

[0069] According to the structure described above, it can be seen that the maximum dimension i of the second flow portion 202 in the length direction of the second cover plate 9 is greater than the maximum dimension j of the second flow portion 202 in the width direction of the second cover plate 9, and the maximum dimension j of the second flow portion 202 in the width direction of the second cover plate 9 is greater than the diameter m of the circular cross-section of the second riveted portion 201, thereby forming the aforementioned installation step surface between the first flow portion 102 and the first riveted portion 101.

[0070] It should be noted that: it is not limited to the aforementioned i>j>m, and i=j=m and so on can also be set.

[0071] In this embodiment, preferably, Figures 11 to 13 As shown, the positive electrode column 1 also includes a second tab connection portion 203, and the second tab connection portion 203 is connected to the end of the second current overflow portion 202 that is away from the second rivet portion 201, and along a direction perpendicular to the first preset direction a, the cross-sectional area of ​​the second tab connection portion 203 is respectively greater than the cross-sectional area of ​​the second rivet portion 201 and the second current overflow portion 202.

[0072] According to the structure described above, the cross-sectional area of ​​the second tab connection portion 203 along the direction perpendicular to the first preset direction a is larger than the cross-sectional area of ​​the second rivet portion 201 and the second flow-through portion 202 along the direction perpendicular to the first preset direction a, respectively, which helps to improve the flow-through capacity and has sufficient contact and welding area with the tab, thereby improving the firmness and stability after welding.

[0073] In this embodiment, preferably, Figure 10 and Figure 16 As shown, the battery cell also includes a fourth plastic part 12 and a second sealing ring 13; wherein, along the first preset direction a, the fourth plastic part 12 is arranged on the inner side of the second cover plate 9, that is, on the side close to the electrode group of the battery cell, and part of the structure of the fourth plastic part 12 extends to between the second pole ear connection part 203 and the second cover plate 9, playing a role of insulation protection; the second sealing ring 13 is sleeved on the outside of the second current flow portion 202, and part of the structure is located in the aforementioned second mounting through hole, and the other part of the structure is against the peripheral structure of the mounting through hole, playing a sealing role.

[0074] In this embodiment, preferably, Figures 4 to 6 、 Figures 11 to 13 As shown, along the direction perpendicular to the first preset direction a, the cross-sections of the first riveted portion 101, the first flow-through portion 102 and the second flow-through portion 202 are all waist-shaped cross-sections. The waist-shaped cross-sections can ensure that their dimensions in the length direction of the cover plate are greater than their dimensions in the width direction of the cover plate, greatly improving the flow-through capacity. Moreover, they have a regular shape, are convenient for processing and manufacturing, and have rounded corners on all sides to avoid scratching the cover plate and other structures.

[0075] It should be noted that the cross-sections of the first riveted portion 101 , the first flow-through portion 102 and the second flow-through portion 202 are not limited to waist-shaped cross-sections, but may also be other shapes, such as a regular rectangle or ellipse.

[0076] In this embodiment, preferably, the material of the positive electrode column 1 is aluminum, and the material of the negative electrode column 2 is copper, which meets the conventional structural requirements of the battery cell and will not be described in detail here.

[0077] It should be noted that: Figure 1 As shown, the first preset direction a may be the thickness direction of the cover plate, but is certainly not limited thereto.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A positive electrode column and a negative electrode column; wherein the positive electrode column includes a first riveted portion and a first current-passing portion connected to each other, and the negative electrode column includes a second riveted portion and a second current-passing portion connected to each other, and the cross-sections of the first current-passing portion, the first riveted portion and the second current-passing portion perpendicular to a first preset direction are all non-circular cross-sections, and the size of the non-circular cross-section in the length direction of the cover of the corresponding battery cell is greater than the size in the width direction of the cover of the battery cell, and the cross-section of the second riveted portion perpendicular to the first preset direction is a circular cross-section.

2. The battery cell according to claim 1, characterized in that Along a first preset direction and from the interior of the battery core toward the exterior thereof, the first current-passing portion and the first riveted portion form an ascending two-stage step-shaped structure.

3. The battery cell according to claim 2, characterized in that The maximum dimension of the first flow-through portion in the length direction of the cover plate is d, the maximum dimension of the first riveted portion in the length direction of the cover plate is f, and d>f; and / or A maximum dimension of the first flow-through portion in the width direction of the cover plate is c, a maximum dimension of the first riveted portion in the width direction of the cover plate is e, and c>e.

4. The battery cell according to claim 1, characterized in that The positive electrode column also includes a first tab connection portion, and the first tab connection portion is connected to an end of the first current flow portion that is away from the first riveted portion, and along a direction perpendicular to the first preset direction, the cross-sectional area of ​​the first tab connection portion is respectively larger than the cross-sectional area of ​​the first current flow portion and the first riveted portion.

5. The battery cell according to claim 1, characterized in that Along a first preset direction and from the interior of the battery core toward the exterior thereof, the second current-transfer portion and the second riveted portion form an ascending two-stage step-shaped structure.

6. The battery cell according to claim 5, characterized in that The maximum dimension of the second overflow portion in the length direction of the cover plate is i, the maximum dimension of the second overflow portion in the width direction of the cover plate is j, the circular cross section of the second riveted portion has a diameter of m, and i>j>m.

7. The battery cell according to claim 1, characterized in that The positive electrode column also includes a second pole tab connection portion, and the second pole tab connection portion is connected to an end of the second current flow portion that is away from the second riveted portion, and along a direction perpendicular to the first preset direction, the cross-sectional area of ​​the second pole tab connection portion is respectively larger than the cross-sectional area of ​​the second current flow portion and the second riveted portion.

8. The battery cell according to claim 1, characterized in that The battery cell includes a shell and a cover plate; wherein, along the first preset direction, the cover plate is installed at an opening at one end of the shell, and the positive electrode column and the negative electrode column are installed on the same cover plate; or The battery cell includes a shell and a cover plate; wherein, along the first preset direction, cover plates are installed at the openings at both ends of the shell, one of the positive electrode column and the negative electrode column is installed on one of the two cover plates, and the other of the positive electrode column and the negative electrode column is installed on the other of the two cover plates.

9. The battery cell according to claim 1, characterized in that: Along a direction perpendicular to the first preset direction, cross sections of the first riveted portion, the first flow-through portion, and the second flow-through portion are all waist-shaped cross sections.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The material of the positive electrode column is aluminum; and / or The negative electrode column is made of copper.

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