Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries, and the single battery comprises a shell with an accommodating cavity; the electrode assembly is positioned in the accommodating cavity and comprises an electrode main body and a tab which are connected with each other; the cover plate assembly comprises a cover plate body and a pole, the cover plate body is connected with the shell and covers the accommodating cavity, the cover plate body is provided with a pole hole, and the pole penetrates through the pole hole; the limiting piece comprises a first limiting part and a second limiting part; a part of the tab is positioned between the first limiting part and the second limiting part and is connected with the first limiting part and the second limiting part respectively; wherein the first limiting part and the second limiting part are respectively connected to the pole, and the tab is electrically connected with the pole. According to the technical scheme, the tabs do not need to be folded, and the tabs and the pole columns are directly welded in a penetrating manner, so that electric connection between the pole columns and the electrode main body is realized, the occupied space can be reduced, and the energy density of the single battery is improved. The arrangement of the limiting pieces can increase the stiffness of the tabs and increase the contact area of the tabs and the pole columns, so that the resistance is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology

[0002] With the development and application of battery technology, the energy density requirements for battery cells are increasing. However, in some single-cell batteries, when the electrode body of the electrode assembly is connected to the terminal post, the electrode tab needs to be folded over for easier welding. Therefore, folding space needs to be left between the electrode body and the cover plate, resulting in wasted space. Utility Model Content

[0003] The purpose of this utility model is to provide a single battery cell to solve the technical problem of space waste caused by folding of the tabs; another purpose of this application is to provide a battery pack.

[0004] Technical solution: This application provides a single-cell battery, including:

[0005] The shell has a receiving cavity;

[0006] An electrode assembly, located within a receiving cavity, includes a connected electrode body and electrode tabs;

[0007] The cover plate assembly includes a cover plate body and an electrode post. The cover plate body is connected to the housing and covers the receiving cavity. The cover plate body has an electrode post hole, and the electrode post passes through the electrode post hole.

[0008] The limiting member includes a first limiting part and a second limiting part, and a portion of the electrode ear is located between the first limiting part and the second limiting part and is connected to the first limiting part and the second limiting part respectively;

[0009] The first limiting part and the second limiting part are respectively connected to the pole post, and the pole tab is electrically connected to the pole post.

[0010] In some embodiments, the single cell has a height direction, the electrode post has a first receiving groove along the height direction, and the portion of the limiting member and the electrode tab is located in the first receiving groove.

[0011] In some embodiments, a first receiving groove is formed on the side of the pole near the electrode assembly.

[0012] In some embodiments, the electrode post includes an electrode post body and an electrode post base connected along the height direction. The electrode post body passes through an electrode post hole, and the electrode post base is located on the side of the electrode post body near the electrode assembly. The electrode post base has a first receiving groove that extends through the electrode post base along the height direction.

[0013] In some embodiments, the single cell includes a cover seal located on the side of the limiting member away from the electrode assembly and sealing it in a first receiving groove.

[0014] In some embodiments, the limiting member includes a third limiting portion, which is located on the side of the first limiting portion and the second limiting portion away from the electrode assembly and is connected to the first limiting portion and the second limiting portion respectively. The first limiting portion, the second limiting portion and the third limiting portion surround and form a second receiving groove. The electrode tab has a folding portion near the cover plate body, and at least a portion of the folding portion is located in the second receiving groove.

[0015] In some embodiments, the single cell has a width direction, and the first limiting portion and the second limiting portion are spaced apart along the width direction.

[0016] In some embodiments, a first guide portion is provided on the side of the first limiting portion near the electrode tab, and a second guide portion is provided on the side of the second limiting portion near the electrode tab. The first guide portion and the second guide portion are arranged opposite to each other in the width direction and form a guide groove, and the electrode tab passes through the guide groove.

[0017] In some embodiments, the limiting member is welded to the pole post; and / or

[0018] The electrode tabs and the limiting components are welded together.

[0019] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0020] Beneficial Effects: The single-cell battery of this application embodiment includes a casing, an electrode assembly, a cover assembly, and a limiting member. The casing has a receiving cavity. The electrode assembly is located within the receiving cavity and includes an electrode body and a tab connected to each other. The cover assembly includes a cover body and a terminal post. The cover body is connected to the casing and seals the receiving cavity. The cover body has a terminal post hole through which the terminal post passes. The limiting member includes a first limiting part and a second limiting part. A portion of the tab is located between the first limiting part and the second limiting part and is connected to the first limiting part and the second limiting part respectively. The first limiting part and the second limiting part are respectively connected to the terminal post, and the tab is electrically connected to the terminal post. This configuration eliminates the need to fold the tab; the tab is directly welded to the terminal post to achieve electrical connection with the terminal post and the electrode body, reducing space occupation and increasing the energy density of the single-cell battery. Furthermore, the first limiting part and the second limiting part increase the stiffness of the tab and the contact area between the tab and the terminal post, thereby reducing resistance.

[0021] The battery pack of this application embodiment includes the above-described single battery cell, and therefore the battery pack can have all the technical features and beneficial effects of the above-described single battery cell, which will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0024] Figure 2 This is an exploded view of a single battery cell according to an embodiment of this application;

[0025] Figure 3 This is a cross-sectional view of a single cell according to the first embodiment of this application;

[0026] Figure 4 This is a cross-sectional view of a single cell according to the second embodiment of this application;

[0027] Figure 5 This is an exploded view of a single cell battery according to the second embodiment of this application;

[0028] Figure 6 This is a cross-sectional view of a single cell according to the third embodiment of this application;

[0029] Figure 7 This is an exploded view of a single cell battery according to the third embodiment of this application;

[0030] Figure 8 This is a cross-sectional view of a single battery cell according to the fourth embodiment of this application;

[0031] Figure 9 This is an exploded view of a single cell battery according to the fourth embodiment of this application;

[0032] Figure 10 This is a cross-sectional view of a single battery cell according to the fifth embodiment of this application;

[0033] Figure 11 This is an exploded view of a single cell according to the fifth embodiment of this application;

[0034] Figure 12 This is a cross-sectional view of a single cell according to the sixth embodiment of this application;

[0035] Figure 13 yes Figure 12 Enlarged view of part A.

[0036] Reference numerals: 1. Housing; 2. Electrode assembly; 3. Cover plate assembly; 4. Limiting member; 5. Cover seal; 6. Connector; 7. Guide groove; 10. Receiving cavity; 20. Electrode body; 21. Electrode tab; 30. Cover plate body; 31. Electrode post; 40. Second receiving groove; 41. First limiting part; 42. Second limiting part; 43. Third limiting part; 210. Closing part; 300. Electrode post hole; 310. First receiving groove; 311. Electrode post body; 312. Electrode post base; 410. First guide part; 420. Second guide part; X, height direction; Y, width direction. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular; for example, an angle within the range of 80° to 100° is considered perpendicular.

[0039] The applicant noted that with the development and application of battery technology, the energy density requirements for battery cells are increasing. However, in some single-cell batteries, when the electrode body of the electrode assembly is connected to the terminal post, the electrode tab needs to be folded over for easier welding. Therefore, folding space needs to be left between the electrode body and the cover plate, resulting in wasted space.

[0040] In view of this, this application provides a single-cell battery, including a housing, an electrode assembly, a cover assembly, and a limiting member; the housing has a receiving cavity; the electrode assembly is located within the receiving cavity, and the electrode assembly includes an electrode body and a tab connected to each other. The cover assembly includes a cover body and a terminal post, the cover body is connected to the housing and seals the receiving cavity, the cover body has a terminal post hole, and the terminal post passes through the terminal post hole. The limiting member includes a first limiting part and a second limiting part, a portion of the tab is located between the first limiting part and the second limiting part and is respectively connected to the first limiting part and the second limiting part, the first limiting part and the second limiting part can be used to gather, support and shape the tab, ensuring that the tab is vertical and welded through to the terminal post, avoiding bending, wrinkling or delamination caused by the thinness and low rigidity of the tab, and causing poor electrical connection or even short circuit within the tab. The first limiting part and the second limiting part are respectively connected to the terminal post, and the tab is electrically connected to the terminal post. This design eliminates the need to fold the tabs; the tabs are directly welded to the terminals to achieve electrical connection with both the terminals and the electrode body. This effectively reduces the distance between the electrode body and the cover assembly, minimizing spatial redundancy and improving the space utilization of the individual battery cell, thereby increasing its energy density. Furthermore, the first and second limiting portions increase the tab stiffness and the contact area between the tab and the terminal, thus reducing resistance.

[0041] The single-cell battery and battery pack of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0042] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 2 This is an exploded view of a single battery cell according to an embodiment of this application; Figure 3 This is a cross-sectional view of a single cell according to the first embodiment of this application;

[0043] Figure 4 This is a cross-sectional view of a single cell according to the second embodiment of this application; Figure 5 This is an exploded view of a single cell battery according to the second embodiment of this application; Figure 6 This is a cross-sectional view of a single cell according to the third embodiment of this application;

[0044] Figure 7 This is an exploded view of a single cell battery according to the third embodiment of this application; Figure 8 This is a cross-sectional view of a single battery cell according to the fourth embodiment of this application; Figure 9 This is an exploded view of a single cell battery according to the fourth embodiment of this application;

[0045] Figure 10 This is a cross-sectional view of a single battery cell according to the fifth embodiment of this application; Figure 11 This is an exploded view of a single cell according to the fifth embodiment of this application; Figure 12 This is a cross-sectional view of a single cell according to the sixth embodiment of this application; Figure 13 yes Figure 12 Enlarged view of part A.

[0046] refer to Figures 1 to 13 This application provides a single-cell battery, including a housing 1, an electrode assembly 2, a cover assembly 3, and a limiting member 4; the housing 1 has a receiving cavity 10; the electrode assembly 2 is located within the receiving cavity 10, and the electrode assembly 2 includes an electrode body 20 and an electrode tab 21 connected to each other. The cover assembly 3 includes a cover body 30 and an electrode post 31, the cover body 30 is connected to the housing 1 and covers the receiving cavity 10, the cover body 30 has an electrode post hole 300, and the electrode post 31 passes through the electrode post hole 300. The limiting member 4 includes a first limiting part 41 and a second limiting part 42. A portion of the electrode tab 21 is located between the first limiting part 41 and the second limiting part 42 and is connected to the first limiting part 41 and the second limiting part 42 respectively. The first limiting part 41 and the second limiting part 42 can be used to gather, support and shape the electrode tab 21, ensuring that the electrode tab 21 is vertical and welded through to the pole post 31. This avoids bending, wrinkling or delamination caused by the thinness and low rigidity of the electrode tab 21, which could lead to poor electrical connection or even short circuit within the electrode tab 21. The first limiting part 41 and the second limiting part 42 are respectively connected to the pole post 31, and the electrode tab 21 is electrically connected to the pole post 31. This configuration eliminates the need to fold the tab 21; it allows for direct contact between the tab 21 and the terminal post 31, or through-welding of the tab 21 to the terminal post 31, thus achieving electrical connection. This effectively reduces the distance between the electrode body 20 and the cover plate assembly 3, thereby minimizing spatial redundancy and improving the space utilization of the individual battery cell, ultimately increasing its energy density. Furthermore, the first limiting part 41 and the second limiting part 42 increase the rigidity of the tab 21 and the contact area between the tab 21 and the terminal post 31, thereby reducing resistance.

[0047] exist Figure 3 In the illustrated embodiment, the tab 21 has a folding portion 210 near the cover plate body 30. The folding portion 210 passes through the limiting member 4, and the tab 21 abuts against the side of the electrode post 31 near the electrode body 20 to achieve electrical connection between the tab 21 and the electrode post 31. The limiting member 4 can be used to fold, support, and shape the tab 21, ensuring that the tab 21 is vertical and welded through the electrode post 31. This avoids bending, wrinkling, or delamination caused by the thinness and low rigidity of the tab 21, which could lead to poor electrical connection or even short circuits within the tab 21. Furthermore, the tab 21 and the electrode post 31 can be connected by laser penetration welding or other methods, which can improve the safety and stability of the connection.

[0048] exist Figures 4 to 13 In the illustrated embodiment, the single-cell battery has a height direction X, and the electrode post has a first receiving groove 310 along the height direction. The limiting member 4 and the portion of the tab 21 are located within the first receiving groove 310. The first receiving groove 310 can be a blind hole or a through hole. By opening the first receiving groove 310 on the side of the electrode post 31 near the electrode body 20, it can be used to accommodate the first limiting part 41, the second limiting part 42, and the tab 21, thereby improving the stability of the connection and further reducing the distance between the electrode body 20 and the cover plate assembly 3, improving the space utilization of the single-cell battery, and thus effectively improving the energy density of the single-cell battery.

[0049] Specifically, in Figure 4 and Figure 5 In the illustrated embodiment, the first receiving groove 310 is formed on the side of the electrode post 31 near the electrode assembly 2. The electrode post 31 includes an electrode post body 311 and an electrode post base 312 connected along the height direction X. The electrode post body 311 passes through the electrode post hole 300, and the electrode post base 312 is located on the side of the electrode post body 311 near the electrode assembly 2. The electrode post base 312 has the first receiving groove 310. The first receiving groove 310 extends along the height direction from the side of the electrode post base 312 near the electrode assembly 2 to the side of the electrode post base 312 away from the electrode assembly 2, and the first receiving groove 310 does not penetrate the electrode post base 312. The electrode post body 311 and the electrode post base 312 enclose a cavity, which can be sealed by providing a sealing plate (not shown) on the side of the electrode post body 311 away from the electrode post base 312. This application, by limiting the first receiving groove 310 to not penetrate the electrode base 312, can prevent electrolyte or air from entering the cavity formed by the electrode body 311 and the electrode base 312 through the gap between the tab 21, the limiting member 4 and the electrode base 312. This avoids the electrolyte from corroding and damaging the electrode 31, and also avoids oxidation reactions caused by air, thereby ensuring the stability and reliability of the internal structure of the electrode 31 and extending the service life of the electrode 31.

[0050] exist Figures 6 to 13 In the embodiment shown, the electrode post 31 includes an electrode post body 311 and an electrode post base 312. The electrode post body 311 passes through the electrode post hole 300. The electrode post base 312 is located on the side of the electrode post body 311 close to the electrode assembly 2 and is connected to the electrode post body 311. The electrode post base 312 has a first receiving groove 310, which is provided through the electrode post base 312 along the height direction.

[0051] exist Figure 6 and Figure 7In the illustrated embodiment, a portion of the tab 21 is retracted and inserted into the limiting member 4. The limiting member 4 and a portion of the tab 21 are located within the first receiving groove 310. The first limiting part 41 and the second limiting part 42 respectively abut against the sidewall of the first receiving groove 310 to achieve electrical connection between the tab 21 and the electrode post 31. This arrangement further reduces the distance between the electrode body 20 and the cover plate assembly 3, improving the space utilization of the single battery cell and thus effectively increasing the energy density of the single battery cell. Furthermore, the limiting member 4 and the electrode post base 312 can be connected via laser welding or other methods, thereby improving the safety and stability of the connection.

[0052] exist Figures 8 to 9 In the illustrated embodiment, the single-cell battery includes a cover seal 5, which is located on the side of the limiting member 4 away from the electrode assembly 2 and seals the first receiving groove 310. The cover seal 5 can be connected to the terminal post 31 by welding or adhesive bonding to achieve the connection and sealing of the interface between the tab 21 and the terminal post base 312. The terminal post body 311 and the terminal post base 312 enclose a cavity, which can be sealed by providing a sealing plate (not shown) on the side of the terminal post body 311 away from the terminal post base 312. By providing the cover seal 5, the terminal post body 311, the sealing plate, and the cover seal 5 can form a sealed cavity, thereby preventing electrolyte or air from entering the cavity through the gaps between the tab 21, the limiting member 4, and the terminal post base 312, preventing electrolyte from corroding and damaging the terminal post 31, and preventing oxidation reactions caused by air, thus ensuring the stability and reliability of the internal structure of the terminal post 31 and extending the service life of the terminal post 31. In some embodiments, the cover 5 abuts against at least one of the tab 21 and the limiting member 4 in the height direction X. This arrangement can improve the connection stability between the cover 5 and the pole 31.

[0053] exist Figure 10 and Figure 11In the illustrated embodiment, the limiting member 4 includes a third limiting portion 43, which is located on the side of the first limiting portion 41 and the second limiting portion 42 away from the electrode assembly 2 and is connected to the first limiting portion 41 and the second limiting portion 42 respectively. The first limiting portion 41, the second limiting portion 42, and the third limiting portion 43 enclose a second receiving groove 40. The electrode tab 21 has a retractable portion 210 near the cover plate body 30, at least a portion of which is located within the second receiving groove 40. The second receiving groove 40 extends along the height direction and does not penetrate the limiting member 4. At least a portion of the retractable portion 210 retracts and passes through the second receiving groove 40. The limiting member 4 passes through the first receiving groove 310 and abuts against the side wall of the first receiving groove 310 to achieve electrical connection between the electrode tab 21 and the electrode post 31. Furthermore, the limiting member 4 and the electrode base 312 can be connected by laser welding or other methods to improve the safety and stability of the connection. For example, this application uses laser welding to form a connector 6 to achieve a sealed connection between the third limiting part 43 and the electrode base 312. This configuration can reduce the distance between the electrode body 20 and the cover assembly 3 to improve the space utilization of the single battery cell, while preventing electrolyte or air from entering the cavity formed by the electrode body 311 and the electrode base 312 through the gaps between the tab 21, the limiting member 4, and the electrode base 312.

[0054] exist Figures 5 to 9 as well as Figure 12 and Figure 13 In the illustrated embodiment, the single battery cell has a width direction Y, which intersects with the height direction X. A first limiting portion 41 and a second limiting portion 42 are spaced apart along the width direction Y. In the embodiment of this application, the width direction Y is perpendicular to the height direction X. The tab 21 is located between the first limiting portion 41 and the second limiting portion 42 and is connected to both. This configuration is simple. The first limiting portion 41 and the second limiting portion 42 can gather, support, and shape the tab 21, ensuring that the tab 21 is vertical and welded through to the terminal post 31. This avoids bending, wrinkling, or delamination due to the thinness and low rigidity of the tab 21, preventing poor electrical connection or even short circuits within the tab 21. Furthermore, the first limiting portion 41 and the second limiting portion 42 can increase the stiffness of the tab 21 and increase the contact area between the tab 21 and the terminal post 31, thereby reducing resistance.

[0055] exist Figure 12 and Figure 13In the illustrated embodiment, a first guide portion 410 is provided on the side of the first limiting portion 41 near the tab 21, and a second guide portion 420 is provided on the side of the second limiting portion 42 near the tab 21. The first guide portion 410 and the second guide portion 420 are arranged opposite each other along the width direction Y and form a guide groove 7, through which the tab 21 passes. The guide groove 7 communicates with the first receiving groove 310. Part of the tab 21 is gathered and sequentially passes through the guide groove 7 and the first receiving groove 310. The first guide portion 410 and the second guide portion 420 are provided to ensure that the tab 21 can accurately pass into the guide groove 7 and the first receiving groove 310, ensuring that the tab 21 can quickly and accurately reach the set position during installation, thus improving installation efficiency and accuracy. In addition, the first guide portion 410 and the second guide portion 420 can prevent the tab 21 from being punctured by external forces during installation or use, reducing the risk of damage to the tab 21. The tab 21 is usually thin and has low rigidity, making it susceptible to deformation or damage from external forces. The presence of the first guide portion 410 and the second guide portion 420 can provide protection for the tab 21 to a certain extent, preventing the tab 21 from being punctured and causing an internal short circuit, thus improving the safety and reliability of the single cell.

[0056] Accordingly, this application provides a battery pack including the aforementioned single battery cell. The single battery cell of this application includes a housing 1, an electrode assembly 2, a cover assembly 3, and a limiting member 4; the housing 1 has a receiving cavity 10; the electrode assembly 2 is located within the receiving cavity 10, and the electrode assembly 2 includes an electrode body 20 and a tab 21 connected to each other. The cover assembly 3 includes a cover body 30 and a terminal post 31; the cover body 30 is connected to the housing 1 and seals the receiving cavity 10; the cover body 30 has a terminal post hole 300, and the terminal post 31 passes through the terminal post hole 300. The limiting member 4 includes a first limiting part 41 and a second limiting part 42. A portion of the electrode tab 21 is located between the first limiting part 41 and the second limiting part 42 and is connected to the first limiting part 41 and the second limiting part 42 respectively. The first limiting part 41 and the second limiting part 42 can be used to gather, support and shape the electrode tab 21, ensuring that the electrode tab 21 is vertical and welded through to the pole post 31. This avoids bending, wrinkling or delamination caused by the thinness and low rigidity of the electrode tab 21, which could lead to poor electrical connection or even short circuit within the electrode tab 21. The first limiting part 41 and the second limiting part 42 are respectively connected to the pole post 31, and the electrode tab 21 is electrically connected to the pole post 31. This configuration eliminates the need to fold the tab 21; it allows for direct contact between the tab 21 and the terminal post 31, or through-welding of the tab 21 to the terminal post 31, thus achieving electrical connection. This effectively reduces the distance between the electrode body 20 and the cover plate assembly 3, thereby minimizing spatial redundancy and improving the space utilization of the individual battery cell, ultimately increasing its energy density. Furthermore, the first limiting part 41 and the second limiting part 42 increase the rigidity of the tab 21 and the contact area between the tab 21 and the terminal post 31, thereby reducing resistance.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The present application provides a detailed description of a single battery cell and a battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single-cell battery, characterized in that, include: The shell has a receiving cavity; An electrode assembly is located within the receiving cavity, and the electrode assembly includes an electrode body and a tab connected to each other. A cover plate assembly includes a cover plate body and an electrode post. The cover plate body is connected to the housing and covers the receiving cavity. The cover plate body has an electrode post hole, and the electrode post passes through the electrode post hole. The limiting member includes a first limiting part and a second limiting part, and a portion of the electrode tab is located between the first limiting part and the second limiting part and is connected to the first limiting part and the second limiting part respectively; The first limiting part and the second limiting part are respectively connected to the pole post, and the pole tab is electrically connected to the pole post.

2. The single-cell battery according to claim 1, characterized in that, The single battery cell has a height direction, and a first receiving groove is provided on the electrode post along the height direction. The limiting member and the portion of the electrode tab are located in the first receiving groove.

3. The single-cell battery according to claim 2, characterized in that, The first receiving groove is formed on the side of the pole near the electrode assembly.

4. The single-cell battery according to claim 2, characterized in that, The electrode post includes an electrode post body and an electrode post base connected along the height direction. The electrode post body passes through the electrode post hole, and the electrode post base is located on the side of the electrode post body near the electrode assembly. The first receiving groove is provided through the electrode post base along the height direction.

5. The single-cell battery according to claim 2, characterized in that, The single cell includes a cover, which is located on the side of the limiting member away from the electrode assembly and covers the first receiving groove.

6. The single-cell battery according to claim 1, characterized in that, The limiting member includes a third limiting part (43), which is located on the side of the first limiting part and the second limiting part away from the electrode assembly and is connected to the first limiting part and the second limiting part respectively. The first limiting part, the second limiting part and the third limiting part (43) surround and form a second receiving groove. The electrode tab has a folding part (210) close to the cover plate body, and at least a portion of the folding part (210) is located in the second receiving groove.

7. The single-cell battery according to claim 1, characterized in that, The single battery cell has a width direction, and the first limiting portion and the second limiting portion are spaced apart along the width direction.

8. The single-cell battery according to claim 7, characterized in that, The first limiting part has a first guide part on the side near the electrode tab, and the second limiting part has a second guide part on the side near the electrode tab. The first guide part and the second guide part are arranged opposite to each other along the width direction and form a guide groove. The electrode tab passes through the guide groove.

9. The single-cell battery according to claim 1, characterized in that, The limiting member is welded to the pole post; and / or The electrode tab and the limiting member are welded together.

10. A battery pack, characterized in that, The single-cell battery includes any one of claims 1-9.

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