Battery monomer and electric equipment
By designing a protrusion on the end cover of the battery cell to connect with the busbar, the problem of excessively long current path in the conventional battery cell is solved, and the resistance and heat loss are reduced.
Patent Information
- Application Number
- CN202510132513.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-06-17
AI Technical Summary
In traditional battery cells, the current path is too long, resulting in an increase in resistance and an increase in heat loss.
A battery cell is designed, wherein the central axis of the end cap is formed with a projection protruding toward the outside of the receiving cavity for connection with the busbar, shortening the current path from the core to the busbar.
The welding position of the busbar is clarified to prevent position chaos, shorten the current path, and reduce resistance and heat loss.
Smart Images
Figure CN120165131A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery cell and an electrical device. Background Art
[0002] A battery cell generally includes a housing and a wound core. The housing is used to accommodate the wound core and electrolyte, and electrical energy is generated by the movement of metal ions (such as lithium ions) between the positive electrode plate and the negative electrode plate of the wound core. For a general battery cell, the wound core needs to be electrically connected to the housing so that the housing serves as the positive output terminal or the negative output terminal of the battery cell. In the traditional solution, the explosion-proof valve is centered, and the external busbar is welded to the other end of the battery. The current channel needs to pass through the housing, and the current path is long. Summary of the Invention
[0003] The present disclosure provides a battery cell and an electrical device to at least solve the above technical problems existing in the prior art.
[0004] In a first aspect of the present disclosure, a battery cell is provided, including: a housing and an end cap;
[0005] The housing has a receiving cavity and an open opening, and the end cap covers the opening;
[0006] Wherein, a convex portion protruding outward from the receiving cavity is formed on the central axis of the end cap, and the convex portion is used for connecting with a busbar.
[0007] Further, the end cap includes a first surface located in the receiving cavity and a second surface located outside the receiving cavity, and the convex portion protrudes in a direction from the first surface to the second surface.
[0008] Further, the end cap is provided with an explosion-proof valve, the explosion-proof valve is located in an area of the end cap away from the central axis, and there is a gap between the explosion-proof valve and the convex portion.
[0009] Further, a first groove is provided on the first surface, the first groove is recessed from the first surface to the second surface, and the explosion-proof valve is installed in the first groove.
[0010] Further, the explosion-proof valve is in a shape of a curved runway.
[0011] Further, a second groove is provided on the second surface, and the second groove is recessed in a direction from the second surface to the first surface.
[0012] Further, the number of the second grooves is multiple, and a plurality of the second grooves along the same circumference are sequentially connected to form an annular groove, and the central axis of the annular groove coincides with the central axis of the end cap.
[0013] Further, it further includes a core, the core includes an active material coating part and a conductive part, the active material coating part is arranged in the accommodation cavity, and the conductive part is electrically connected to the active material coating part and the second groove.
[0014] Further, the thickness d of the end cover satisfies: d ≥ 1.5 mm.
[0015] The second aspect of the present disclosure provides an electrical device, including the battery cell described in the first aspect.
[0016] The technical solutions provided by the embodiments of the present disclosure have the following advantages compared with the prior art:
[0017] The battery cell provided by the embodiment of the present disclosure includes a housing and an end cover; the housing has an accommodation cavity and an open opening, and the end cover covers the opening; wherein, a convex part protruding outward from the accommodation cavity is formed on the central axis of the end cover, and the convex part is used for connecting with a bus bar. The end cover is designed with a convex part, and the convex part forms a bus bar welding area, which can clarify the bus bar welding position, prevent the bus bar welding position from being chaotic, and is beneficial to bus bar welding; the external bus bar is directly welded on the end cover, shortening the current path from the core to the bus bar, reducing the resistance, and reducing the electrothermal loss.
[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understandable through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become easily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, wherein:
[0020] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.
[0021] Figure 1 Shows a schematic structural diagram of the battery cell provided by the embodiment of the present disclosure;
[0022] Figure 2 Shows a schematic cross-sectional structure diagram of the battery cell provided by the embodiment of the present disclosure;
[0023] Figure 3 Shows a schematic structural diagram of the end cover in the battery cell provided by the embodiment of the present disclosure Figure 1 ;
[0024] Figure 4 Shows a schematic structural diagram of the end cover in the battery cell provided by the embodiment of the present disclosure Figure 2 .
[0025] Description of reference numerals in the figure: 1. Housing; 2. End cover; 21. First surface; 211. First groove; 22. Second surface; 221. Protrusion; 222. Second groove; 3. Explosion-proof valve; 4. Penetration welding structure. Specific embodiments
[0026] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present disclosure.
[0027] Combined with Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in
[0028]
[0029] In some specific embodiments, the end cover 2 is provided with an explosion-proof valve 3. The explosion-proof valve 3 is located in a region of the end cover 2 away from the central axis, and there is a gap between the explosion-proof valve 3 and the protrusion 221. The end cover 2 is designed with a bus bar welding area formed by the protrusion 221 to clarify the welding position and prevent the bus bar welding position from being chaotic. There is a gap between the explosion-proof valve 3 and the protrusion 221, which can avoid the position of the explosion-proof valve 3 and is beneficial to bus bar welding. The external bus bar is directly welded on the end cover 2, shortening the current path from the winding core to the bus bar, reducing the resistance, and lowering the electrothermal loss. The bus bar welding area is higher than the plane of the explosion-proof valve 3, protecting the explosion-proof valve 3 from being damaged by bumps during operations such as welding and assembly.
[0030] In some specific embodiments, the first surface 21 is provided with a first groove 211, the first groove 211 is recessed from the first surface 21 towards the second surface 22, and the explosion-proof valve 3 is installed in the first groove 211, so that the height of the bus bar welding area can be higher than the plane of the explosion-proof valve 3, and the explosion-proof valve 3 can be protected from being knocked and damaged during operations such as welding and assembly.
[0031] In some specific embodiments, the explosion-proof valve 3 is in a bent runway shape, which can ensure sufficient valve-opening exhaust channels. This embodiment combines the bus bar area and the bent runway-shaped explosion-proof valve 3 structure, and the penetration welding structure 4 between the end cap 2 and the winding core ensures the shortest external current path of the winding core, and the bent runway-shaped explosion-proof valve 3 structure also ensures sufficient valve-opening exhaust channels.
[0032] In some specific embodiments, the explosion-proof valve 3 is in an arc shape centered on the central axis of the end cap 2, which can ensure sufficient valve-opening exhaust channels. This embodiment combines the bus bar area and the bent runway-shaped explosion-proof valve 3 structure, the penetration welding structure 4 ensures the shortest external current path of the winding core, and the explosion-proof valve 3 structure also ensures sufficient valve-opening exhaust channels.
[0033] In some specific embodiments, the second surface 22 is provided with a second groove 222, the second groove 222 is recessed from the second surface 22 towards the first surface 21. The second groove 222 forms a penetration welding area, and the end cap 2 is welded to the winding core through the penetration welding area to form a penetration welding structure 4, and the bus bar is externally connected through the bus bar welding area, ensuring the shortest current path from the winding core to the bus bar; the bent runway-shaped explosion-proof valve 3 is lower than the plane of the end cap 2, protecting the explosion-proof valve 3 from being knocked during operation.
[0034] In some specific embodiments, the number of the second grooves 222 is multiple, and a plurality of second grooves 222 along the same circumference are sequentially connected to form an annular groove, and the central axis of the annular groove coincides with the central axis of the end cap 2. The end cap 2 is welded to the winding core through the second groove 222, and the bus bar is externally connected through the bus bar welding area, ensuring the shortest current path from the winding core to the bus bar.
[0035] In some specific embodiments, a winding core is further included, the winding core includes an active material coating part and a conductive part, the active material coating part is arranged in the accommodating cavity, and the conductive part is electrically connected to the active material coating part and the second groove 222. The end cap 2 is welded to the winding core through the second groove 222, and the bus bar is externally connected through the bus bar welding area, ensuring the shortest current path from the winding core to the bus bar.
[0036] In some specific embodiments, the thickness d of the end cap 2 satisfies: d≥1.5 mm. The thickness of the end cap 2 is increased to 1.5 mm, and the structural strength is increased, solving the problem that the external busbar is easily welded through during welding. The thickness of the busbar connecting piece is <1.5 mm, and welding with the end cap 2 ensures the effectiveness of welding and avoids leakage of gas and liquid during welding.
[0037] The electrical device provided by the embodiment of the present disclosure includes the battery cell provided by the embodiment of the present disclosure. Since the electrical device provided by the embodiment of the present disclosure and the battery cell provided by the embodiment of the present disclosure have the same advantages, they will not be described herein again.
[0038] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present disclosure can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions disclosed in this embodiment can be achieved. No limitations are imposed herein.
[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically defined.
[0040] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims
1. A battery cell, characterized in that: include: A housing (1) and an end cover (2); The housing (1) has a containing cavity and an open opening, and the end cover (2) covers the opening; Wherein, a protrusion (221) protruding outward from the accommodating cavity is formed on the central axis of the end cover (2), and the protrusion (221) is used for connecting to the busbar.
2. The battery cell according to claim 1, characterized in that: The end cover (2) comprises a first surface (21) located in the accommodating cavity and a second surface (22) located outside the accommodating cavity, and the protrusion (221) protrudes from the first surface (21) in the direction of the second surface (22).
3. The battery cell according to claim 2, characterized in that: The end cover (2) is provided with an explosion-proof valve (3), the explosion-proof valve (3) is located in a region of the end cover (2) away from the central axis, and there is a gap between the explosion-proof valve (3) and the raised portion (221).
4. The battery cell according to claim 3, characterized in that: The first surface (21) is provided with a first groove (211), the first groove (211) is recessed from the first surface (21) toward the second surface (22), and the explosion-proof valve (3) is installed in the first groove (211).
5. The battery cell according to claim 4, characterized in that: The explosion-proof valve (3) is in the shape of a curved runway.
6. The battery cell according to claim 2, characterized in that: The second surface (22) is provided with a second groove (222), and the second groove (222) is recessed from the second surface (22) towards the first surface (21).
7. The battery cell according to claim 6, characterized in that: There are multiple second grooves (222), and multiple second grooves (222) along the same circumference are connected in sequence to form an annular groove, and the central axis of the annular groove coincides with the central axis of the end cover (2).
8. The battery cell according to claim 6, characterized in that: It also includes a winding core, which includes an active material coating portion and a conductive portion, the active material coating portion is arranged in the accommodating cavity, and the conductive portion electrically connects the active material coating portion and the second groove (222).
9. The battery cell according to claim 1, characterized in that: The thickness d of the end cover (2) satisfies: d≥1.5 mm.
10. An electrical device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.