Single battery and battery pack
By employing cover plate components, electrode components, and limiting components in the design of individual cells, the problem of excessively long electrical connection paths between the tabs and terminals is solved, achieving high energy density and improved safety of individual cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-03-31
AI Technical Summary
In a single battery cell, an excessively long electrical connection path between the tab and the terminal leads to reduced battery cell performance and increased safety risks.
The design employs a cover plate assembly, electrode assembly, and limiting component. The electrode tab is directly inserted into the connection hole and electrically connected to the electrode post through the limiting component, which reduces space occupation, increases the contact area, and prevents heat from affecting the electrode body through the limiting component.
It improves the energy density and safety of individual cells, reduces resistance, and enhances the reliability and stability of electrical connections.
Smart Images
Figure CN224067846U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of single-cell battery technology, specifically relating to a single-cell battery and a battery pack. Background Technology
[0002] In some single-cell batteries, the tabs and terminals are usually electrically connected by welding or connecting tab welding. Therefore, the tabs or connecting tabs need to be designed to a certain length to meet the welding requirements. After the electrical connection is made, they are installed into the cell housing. The tabs or connecting tabs need to occupy a certain height space. At the same time, long tabs and connecting tabs increase the electrical connection path from the electrode assembly to the terminal, which can easily cause the heat generated by the single cell to increase during use, ultimately leading to a decrease in the performance of the single cell and an increase in safety risks. Utility Model Content
[0003] Purpose of the utility model: The embodiments of this application provide a single cell battery and a battery pack, aiming to solve the technical problem of reduced performance of a single cell battery caused by excessively long electrical connection paths between electrode components and terminals.
[0004] Technical solution: This application provides a single-cell battery, including:
[0005] The cover plate assembly has intersecting first and second directions. The cover plate assembly includes a cover plate body and a pole post. The cover plate body has a pole post hole that extends through the first direction. The pole post is disposed in the pole post hole. The pole post has a first stepped groove and a connecting hole that are connected. The first stepped groove is disposed around the connecting hole.
[0006] An electrode assembly is disposed on one side of the cover plate assembly in a first direction. The electrode assembly includes an electrode body and a tab connected to each other. The electrode body is located on the side of the first stepped groove away from the connection hole, and part of the tab is disposed in the connection hole.
[0007] The limiting member includes a clamping part and a limiting part. The clamping part is disposed in the connecting hole, and the limiting part is disposed in the first step groove. The electrode tab is provided with limiting members on both sides in the second direction. The clamping parts of the limiting members on both sides clamp the electrode tab together and are electrically connected to the electrode tab and the electrode post.
[0008] In some embodiments, the limiting portion has a first mating surface disposed opposite to the pole post in a first direction, and the pole post has a second mating surface disposed opposite to the limiting portion. The first mating surface and the second mating surface are fitted together, and the included angle between the first mating surface and the first direction is an acute angle or an obtuse angle.
[0009] In some embodiments, one of the limiting part and the pole post is provided with a protrusion, and the other of the limiting part and the pole post is provided with a groove for the protrusion to be inserted. The protrusion and the groove are provided at the connection between the limiting part and the pole post in the first direction.
[0010] In some embodiments, a guide portion is provided on the side of the limiting portion near the electrode tab, and the guide portions of the limiting members on both sides of the electrode tab are arranged opposite to each other along the second direction and form guide grooves, with the electrode tab passing through the guide grooves.
[0011] In some embodiments, the cover plate assembly has a second direction, along which the side of the first stepped groove away from the clamping portion and the side of the connecting hole near the limiting portion have a maximum dimension L1 mm, and the side of the limiting portion away from the clamping portion and the side of the clamping portion near the limiting portion have a maximum dimension L2 mm, satisfying: L1≥L2.
[0012] In some embodiments, along the first direction, the first stepped groove has a maximum size T1 mm, and the limiting portion has a maximum size T2 mm, satisfying: T1≥T2.
[0013] In some embodiments, the electrode post includes an electrode post body and an electrode post base connected along a first direction. The electrode post base is located on the side of the electrode post body near the electrode assembly. The connection hole extends through the electrode post base along the first direction. The electrode post body has a groove extending through the first direction, and the groove communicates with the connection hole.
[0014] The single cell includes a sealing plate, which is connected to the electrode body and covers the groove.
[0015] In some embodiments, the side of the limiting member away from the electrode assembly is flush with the side of the pole base away from the electrode assembly.
[0016] In some embodiments, the single cell includes an adhesive layer located between the electrode post and the limiting portion and connected to the electrode post and the limiting portion respectively.
[0017] Accordingly, this application provides a battery pack including the aforementioned single battery cell.
[0018] Beneficial Effects: The single-cell battery of this application embodiment includes a cover plate assembly, an electrode assembly, and a limiting member. The cover plate assembly has intersecting first and second directions. The cover plate assembly includes a cover plate body and an electrode post. The cover plate body has an electrode post hole that extends through the first direction. The electrode post is disposed in the electrode post hole and has a first stepped groove and a connecting hole that are connected. The first stepped groove surrounds the connecting hole. The electrode assembly is disposed on one side of the cover plate assembly in the first direction. The electrode assembly includes an electrode body and an electrode tab that are connected. The electrode body is located on the side of the first stepped groove away from the connecting hole, and part of the electrode tab is disposed in the connecting hole. The limiting member includes a clamping part and a limiting part. The clamping part is disposed in the connecting hole, and the limiting part is disposed in the first stepped groove. Limiting members are respectively provided on both sides of the electrode tab in the second direction. The clamping parts of the two limiting members together clamp the electrode tab and are electrically connected to the electrode tab and the electrode post. This design eliminates the need to fold the tabs; they are directly inserted into the connection hole and electrically connected to the terminal post via a limiting component. This achieves electrical connection between the tabs and the terminal post and electrode body, reducing space occupation and increasing the energy density of the single cell. The clamping part increases the tab stiffness and the contact area between the tab and the terminal post, thus reducing resistance. The limiting component not only limits the tab position but also prevents heat generated during welding of the tab and terminal post from affecting the electrode body, thereby improving the safety and reliability of the single cell.
[0019] 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
[0020] 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.
[0021] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;
[0022] Figure 2 yes Figure 1 AA section view;
[0023] Figure 3 This is an exploded view of a cover plate assembly according to an embodiment of this application;
[0024] Figure 4 This is a schematic diagram of the structure of a pole post according to an embodiment of this application;
[0025] Figure 5This is a bottom view of a pole column according to an embodiment of this application;
[0026] Figure 6 This is a cross-sectional view of the first type of pole post according to an embodiment of this application;
[0027] Figure 7 This is a cross-sectional view of the second type of pole post according to an embodiment of this application;
[0028] Figure 8 This is a cross-sectional view of the third type of pole post according to an embodiment of this application;
[0029] Figure 9 This is a cross-sectional view of the fourth type of pole post according to an embodiment of this application;
[0030] Figure 10 This is a schematic diagram of the structure of the first type of limiting member according to an embodiment of this application;
[0031] Figure 11 This is a schematic diagram of the structure of the second type of limiting member according to an embodiment of this application.
[0032] Reference numerals: 1. Cover plate assembly; 2. Electrode assembly; 3. Limiting member; 4. Sealing plate; 5. Adhesive layer; 6. Housing; 10. Cover plate body; 11. Electrode post; 20. Electrode body; 21. Electrode lug; 30. Clamping part; 31. Limiting part; 60. Receiving cavity; 100. Electrode post hole; 110. First step groove; 111. Connecting hole; 112. Second mating surface; 113. Groove; 114. Electrode post body; 115. Electrode post base; 310. First mating surface; 311. Protrusion; 312. Guide part; 313. Guide groove; 1140. Groove body; X, First direction; Y, Second direction. Detailed Implementation
[0033] 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.
[0034] 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, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.
[0035] The applicant noted that in some single-cell batteries, the tabs and terminals are usually electrically connected by welding or connecting tabs. Therefore, the tabs or connecting tabs need to be designed to a certain length to meet the welding requirements. After the electrical connection is made, the tabs or connecting tabs are installed into the cell housing, which requires a certain amount of height space. At the same time, long tabs and connecting tabs increase the electrical connection path from the electrode assembly to the terminal, which can easily cause increased heat generation during the use of the single-cell battery, ultimately leading to a decrease in the performance of the single-cell battery and an increase in safety risks.
[0036] In view of this, this application provides a single-cell battery, including a cover assembly 1, an electrode assembly 2, and a limiting member 3. The cover assembly 1 has a first direction X and a second direction Y. Optionally, the first direction X is the thickness direction of the cover assembly 1, and the second direction Y is the width direction or the length direction of the cover assembly 1. The cover assembly 1 includes a cover body 10 and an electrode post 11. The cover body 10 has an electrode post hole 100 extending along the first direction X. The electrode post 11 is disposed in the electrode post hole 100. The electrode post 11 has a first stepped groove 110 and a connecting hole 111 that are connected. The first stepped groove 110 is disposed around the connecting hole 111. The electrode assembly 2 is disposed on one side of the cover assembly 1 in the first direction X. The electrode assembly 2 includes an electrode body 20 and an electrode tab 21 connected to each other. The electrode body 20 is located on the side of the first stepped groove 110 away from the connecting hole 111, and part of the electrode tab 21 is disposed in the connecting hole 111. In other words, the first stepped groove 110 is located on the side of the electrode post 11 near the electrode body 20, and the connecting hole 111 is located on the side of the first stepped groove 110 away from the electrode body 20. The limiting member 3 includes a clamping part 30 and a limiting part 31. The clamping part 30 is located in the connecting hole 111 and is used to clamp the tab 21. The limiting part 31 is connected to the clamping part 30 on the side near the electrode body 20 and is located in the first stepped groove 110. The tab 21 has limiting members 3 on both sides in the second direction Y. The clamping parts 30 of the limiting members 3 on both sides clamp the tab 21 together, and the tab 21 is electrically connected to the electrode post 11 through the limiting members 3 on both sides. With this configuration, there is no need to fold the tab 21. The tab 21 is directly inserted into the connecting hole 111 and electrically connected to the electrode post 11 through the limiting members 3 to achieve electrical connection between the tab 21 and the electrode body 20. This can reduce space occupation and improve the energy density of the single cell. By setting the clamping part 30, the stiffness of the tab 21 can be increased, and the contact area between the tab 21 and the post 11 can be increased to reduce the resistance. By setting the limiting part 31, the tab 21 can be limited on the one hand, and the heat generated when welding the tab 21 and the post 11 can be prevented from affecting the electrode body 20, thereby improving the safety and reliability of the single cell.
[0037] 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.
[0038] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 2 yes Figure 1 AA section view; Figure 3 This is an exploded view of a cover plate assembly 1 according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a pole post 11 according to an embodiment of this application; Figure 5 This is a bottom view of a pole post 11 according to an embodiment of this application;
[0039] Figure 6 This is a cross-sectional view of the first type of pole post 11 according to an embodiment of this application; Figure 7 This is a cross-sectional view of the second type of pole post 11 according to an embodiment of this application; Figure 8 This is a cross-sectional view of the third type of pole post 11 in this application embodiment; Figure 9 This is a cross-sectional view of the fourth type of pole post 11 in this application embodiment; Figure 10 This is a schematic diagram of the structure of the first limiting member 3 according to an embodiment of this application; Figure 11 This is a schematic diagram of the structure of the second type of limiting member 3 in this application embodiment.
[0040] refer to Figures 1 to 11 This application provides a single-cell battery, including a cover plate assembly 1, an electrode assembly 2, and a limiting member 3. The cover plate assembly 1 has a first direction X, which is the height direction of the cover plate. A housing 6 and the cover plate assembly 1 enclose a receiving cavity 60. The cover plate assembly 1 includes a cover plate body 10 and an electrode post 11. The cover plate body 10 has an electrode post hole 100 extending along the first direction X. The electrode post 11 is disposed in the electrode post hole 100 and has a communicating first stepped groove 110 and a connecting hole 111. The first stepped groove 110 surrounds the connecting hole 111. The electrode assembly 2 is disposed on one side of the cover plate assembly 1 in the first direction X and located within the receiving cavity 60. The electrode assembly 2 includes a connected electrode body 20 and an electrode tab 21. The electrode tab 21 is disposed within the connecting hole 111. The first stepped groove 110 is disposed on the side of the electrode post 11 closer to the electrode body 20, and the connecting hole 111 is disposed on the side of the first stepped groove 110 away from the electrode body 20. Figure 4 and Figure 5 As shown; the limiting member 3 includes a clamping part 30 and a limiting part 31. The clamping part 30 is disposed in the connecting hole 111 and clamps the electrode tab 21. The limiting part 31 is connected to the side of the clamping part 30 near the electrode body 20 and is disposed in the first step groove 110. The electrode tab 21 is electrically connected to the electrode post 11 through the limiting member 3.
[0041] With this configuration, there is no need to fold the tab 21. The tab 21 can be directly abutted against the terminal post 11 or the tab 21 can be welded to the terminal post 11 to achieve electrical connection between the tab 21 and the terminal post 11. This can effectively reduce the distance between the electrode body 20 and the cover plate assembly 1, thereby reducing the space redundancy between the electrode body 20 and the cover plate assembly 1, improving the space utilization of the single cell, and thus effectively improving the energy density of the single cell.
[0042] Furthermore, by providing a clamping part 30, this embodiment of the application can, on the one hand, increase the contact area between the tab 21 and the post 11 to reduce resistance; on the other hand, the clamping part 30 can gather, support, and shape the tab 21, ensuring that the tab 21 is vertical and welded through to the post 11, avoiding 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 post 11 can be electrically connected through laser penetration welding or other methods, which can improve the safety and stability of the electrical connection. In this embodiment, by providing a limiting part 31, on the one hand, the tab 21 can be further limited, thereby improving the structural stability of the single cell and the reliability of the electrical connection; on the other hand, by separating the electrode body 20 from the welding surfaces of the tab 21 and the terminal post 11 by the limiting part 31, the heat generated during the laser welding of the tab 21 and the terminal post 11 can be prevented from affecting the electrode body 20, thereby improving the safety and reliability of the single cell.
[0043] exist Figure 6 In the illustrated embodiment, the limiting portion 31 has a first mating surface 310 disposed opposite to the electrode post 11 in the first direction X, and the electrode post 11 has a second mating surface 112 disposed opposite to the limiting portion 31. The first mating surface 310 and the second mating surface 112 are fitted together, and the angle between the first mating surface 310 and the first direction X is a right angle. It can be understood that the cover assembly 1 has a second direction Y, which is the width direction of the cover assembly 1. The limiting portion 31 extends along the second direction Y and can limit the electrode tab 21, thereby improving the structural stability of the single battery cell and the reliability of the electrical connection.
[0044] exist Figure 7 In the illustrated embodiment, the limiting part 31 has a first mating surface 310 disposed opposite to the electrode post 11 in the first direction X, and the electrode post 11 has a second mating surface 112 disposed opposite to the limiting part 31. The first mating surface 310 and the second mating surface 112 are fitted together, and the angle between the first mating surface 310 and the first direction X is an acute angle. It can be understood that the limiting part 31 extends from its connection with the clamping part 30 toward the side away from the electrode assembly 2, and the first stepped groove 110 of the electrode post 11 is provided with an acute-angled groove matching the shape of the limiting part 31. With this configuration, after the limiting member 3 is assembled to the electrode post 11, the first stepped groove 110 acts as a guide, preventing the limiting member 3 from sinking before welding, which would result in a stepped weld surface and affect the welding effect.
[0045] exist Figure 9In the illustrated embodiment, the limiting portion 31 has a first mating surface 310 disposed opposite to the electrode post 11 in the first direction X, and the electrode post 11 has a second mating surface 112 disposed opposite to the limiting portion 31. The first mating surface 310 and the second mating surface 112 are fitted together, and the angle between the first mating surface 310 and the first direction X is an obtuse angle. It can be understood that the limiting portion 31 extends from its connection with the clamping portion 30 toward the side closer to the electrode assembly 2, and the first stepped groove 110 of the electrode post 11 is provided with an obtuse-angled groove matching the shape of the limiting portion 31. With this configuration, after the limiting member 3 is assembled to the electrode post 11, the first stepped groove 110 acts as a guide, preventing the limiting member 3 from sinking before welding, which would result in a stepped weld surface and affect the welding effect.
[0046] In some embodiments, one of the limiting portion 31 and the pole post 11 is provided with a protrusion 311, and the other of the limiting portion 31 and the pole post 11 is provided with a groove 113 for the protrusion 311 to be inserted into. The protrusion 311 and the groove 113 are provided at the connection between the limiting portion 31 and the pole post 11 in the first direction X. Exemplarily, in Figure 8 In the illustrated embodiment, the limiting portion 31 has a first mating surface 310 disposed opposite to the electrode post 11 in the first direction X, and the electrode post 11 has a second mating surface 112 disposed opposite to the limiting portion 31. The angle between the first mating surface 310 and the first direction X is a right angle. A protrusion 311 is disposed on the first mating surface 310 and protrudes towards the electrode post 11, and a groove 113 is disposed on the second mating surface 112 and recessed towards the direction away from the electrode assembly 2. The protrusion 311 is embedded in the groove 113. Figure 9 In the illustrated embodiment, the limiting part 31 has a first mating surface 310 disposed opposite to the electrode post 11 in the first direction X, and the electrode post 11 has a second mating surface 112 disposed opposite to the limiting part 31. The angle between the first mating surface 310 and the first direction X is an obtuse angle. A protrusion 311 is disposed on the first mating surface 310 and protrudes towards the electrode post 11, and a groove 113 is disposed on the second mating surface 112 and recessed towards the direction away from the electrode assembly 2. The protrusion 311 is embedded in the groove 113. By providing the protrusion 311 and the groove 113 that are interconnected in the first direction X, the contact area between the limiting part 31 and the electrode post 11 can be increased, thereby preventing the limiting part 3 from sinking before welding, which would cause a step on the welding surface and affect the welding effect.
[0047] In other embodiments, a snap-fit structure can be provided at the connection between the limiting part 31 and the pole post 11 in the first direction X, thereby improving the connection stability between the limiting part 31 and the pole post 11 and preventing the limiting part 3 from sinking before welding, which would cause a step on the welding surface and affect the welding effect.
[0048] In some embodiments, there are multiple limiting members 3, with at least two limiting members 3 spaced apart along the second direction Y and clamping the tab 21. The multiple limiting members 3 work together to clamp and position the tab 21, ensuring that the tab 21 does not shake or shift during charging and discharging, which helps to ensure the stability and reliability of the single battery cell. A guide portion 312 is provided on the side of the limiting portion 31 near the tab 21. At least two guide portions 312 are arranged opposite each other along the second direction Y and form guide grooves 313. The tab 21 passes through the guide grooves 313 and extends into the connecting hole 111 between the clamping portions 30. By providing guide portions 312 in the limiting portion 31, the limiting portion 31 has smooth edges, which can prevent the tab 21 from being scratched when passing through the limiting member 3, thus avoiding problems such as short circuits and ensuring the stability and reliability of the single battery cell. Furthermore, the guide grooves 313 can act as guides, allowing the tab 21 to be quickly passed into the connecting hole 111, improving assembly efficiency and accuracy.
[0049] exist Figure 11 In the illustrated embodiment, the single cell includes an adhesive layer 5, which is located between the electrode post 11 and the limiting part 31 and is connected to both the electrode post 11 and the limiting part 31. The adhesive layer 5 is disposed between the first mating surface 310 and the second mating surface 112 to prevent the limiting part 3 from sinking before welding, which would cause a step on the welding surface and affect the welding effect.
[0050] exist Figure 6 and Figure 10 In the illustrated embodiment, the cover plate assembly 1 has a second direction Y, which is the width direction of the cover plate assembly 1. Along the second direction Y, the side of the first stepped groove 110 away from the clamping part 30 and the side of the connecting hole 111 near the limiting part 31 have a maximum dimension L1 mm, and the side of the limiting part 31 away from the clamping part 30 and the side of the clamping part 30 near the limiting part 31 have a maximum dimension L2 mm, satisfying: L1≥L2. This arrangement ensures that during assembly, the limiting part 31 can be smoothly placed in the first stepped groove 110, without causing installation difficulties or interference with other components due to excessive size, thus improving assembly efficiency.
[0051] exist Figure 6 and Figure 10 In the illustrated embodiment, along the first direction X, the first stepped groove 110 has a maximum size T1 mm, and the limiting part 31 has a maximum size T2 mm, satisfying T1 ≥ T2. This arrangement ensures that the side of the limiting part 31 near the electrode assembly 2 does not extend beyond the side of the electrode post 11 near the electrode assembly 2. On the one hand, it reduces the space occupied by the limiting part 31 in the first direction X; on the other hand, it avoids rubbing between the limiting part 31 and the electrode body 20, thereby improving the stability and reliability of the single cell.
[0052] In some embodiments, the electrode post 11 includes a connected electrode post body 114 and an electrode post base 115. The electrode post base 115 is located on the side of the electrode post body 114 near the electrode assembly 2. A connection hole 111 penetrates the electrode post base 115 along a first direction X. The electrode post body 114 has a groove 1140 penetrating along the first direction X, and the groove 1140 communicates with the connection hole 111. By setting the groove 1140, the overall weight of the electrode post 11 can be increased, thereby improving the energy density of the single cell. The single cell includes a sealing plate 4, which is connected to the electrode post body 114 and covers the groove 1140. By setting the sealing plate 4 to block the groove 1140, foreign matter can be prevented from entering. In addition, the side of the sealing plate 4 away from the electrode assembly 2 can be connected to a busbar (not shown). According to design requirements, while ensuring overcurrent, the busbar and the sealing plate 4 can be thinned to reduce space occupation and improve the energy density of the single cell.
[0053] exist Figures 7 to 9 In the illustrated embodiment, the side of the limiting member 3 furthest from the electrode assembly 2 is flush with the side of the pole base 115 furthest from the electrode assembly 2. The limiting member 3 and the pole base 115 can be connected using methods such as laser butt welding, and the limiting member 3 and the electrode tab 21 can also be connected using methods such as laser butt welding. If a step appears between the side of the limiting member 3 furthest from the electrode assembly 2 and the side of the pole base 115 furthest from the electrode assembly 2, it will affect the welding strength and welding quality.
[0054] Accordingly, embodiments of this application provide a battery pack including the aforementioned individual battery cells. A battery pack can be a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. When there are multiple individual battery cells, they can be connected in series, parallel, or a combination thereof. The battery pack of this application embodiment includes the aforementioned individual battery cells; therefore, the battery pack can possess all the technical features and beneficial effects of the aforementioned individual battery cells, which will not be elaborated upon here.
[0055] 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.
[0056] 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, characterized by, The single battery comprises a cover plate assembly, an electrode assembly, and a limiting piece. The cover plate assembly has a first direction and a second direction intersecting with each other, and comprises a cover plate body and a pole post. The cover plate body has a pole post hole penetrating along the first direction. The pole post is arranged in the pole post hole and has a first stepped groove and a connecting hole communicating with each other.
2. The cell according to claim 1, wherein The first stepped groove is arranged around the connecting hole.
3. The cell according to claim 1, wherein The electrode assembly is arranged on one side of the cover plate assembly in the first direction.
4. The cell according to claim 1, wherein The electrode assembly comprises an electrode body and a tab connected with each other.
5. The cell according to claim 1, wherein The electrode body is located on the side of the first stepped groove away from the connecting hole.
6. The cell according to claim 1, wherein Part of the tab is arranged in the connecting hole.
7. The cell according to claim 1, wherein The limiting piece comprises a clamping part and a limiting part connected with each other. The clamping part is arranged in the connecting hole.
8. The cell according to claim 7, wherein The limiting part is arranged in the first stepped groove.
9. The cell of claim 1 wherein, The tab is clamped by the clamping parts of the limiting pieces on both sides of the tab in the second direction.
10. A battery pack, characterized by, The clamping parts of the limiting pieces are electrically connected with the tab and the pole post. The limiting part has a first matching surface opposite to the pole post in the first direction. The pole post has a second matching surface opposite to the limiting part. The first matching surface and the second matching surface are arranged in close contact. The angle between the first matching surface and the first direction is an acute angle or an obtuse angle. One of the limiting part and the pole post is provided with a convex part. The other of the limiting part and the pole post is provided with a groove for embedding the convex part. The convex part and the groove are arranged at the connection of the limiting part and the pole post in the first direction. The limiting part is provided with a guide part on the side close to the tab. The guide parts of the limiting pieces on both sides of the tab are arranged opposite to each other along the second direction and form a guide groove. The tab is arranged in the guide groove. The cover plate assembly has a second direction. Along the second direction, the maximum size L1 mm is between the side of the first stepped groove away from the clamping part and the side of the connecting hole close to the limiting part. The maximum size L2 mm is between the side of the limiting part away from the clamping part and the side of the clamping part close to the limiting part. L1 is greater than or equal to L2. Along the first direction, the maximum size T1 mm is of the first stepped groove. The maximum size T2 mm is of the limiting part. T1 is greater than or equal to T2. The pole post comprises a pole post body and a pole post base connected with each other along the first direction. The pole post base is located on the side of the pole post body close to the electrode assembly. The connecting hole penetrates the pole post base along the first direction. The pole post body has a groove penetrating along the first direction. The groove communicates with the connecting hole. The single battery comprises a sealing plate connected with the pole post body and covering the groove. The side of the clamping part away from the electrode assembly is flush with the side of the pole post base away from the electrode assembly. The single battery comprises a glue layer between the pole post and the limiting part and connected with the pole post and the limiting part respectively. The single battery comprises any one of claims 1-9.