Battery cell confluence sheet and cylindrical battery cell
By designing the central boss and through-hole structure of the battery cell busbar, the problems of low injection efficiency and easy damage to the coil core in the existing battery cell structure are solved, and the rapid injection and penetration of the electrolyte is achieved, reducing the damage rate and increasing the welding area.
Patent Information
- Application Number
- CN202421114508.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing battery cell structure has the problem of low liquid injection efficiency and easy damage to the core.
A battery cell busbar is designed, including a busbar body and a central boss. The central boss is located at the center of the busbar body and one side of the protruding side, and a through hole is opened on its top surface and side wall to ensure that the electrolyte can flow out quickly and penetrate into the core.
By designing the central boss and multiple through holes, the liquid injection efficiency and permeability of the electrolyte are improved, the damage rate of the core is reduced, and the welding area between the battery core busbar and the shell is enhanced, thereby reducing the resistance value.
Smart Images
Figure CN222562923U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery cell busbar and a cylindrical battery cell. Background Art
[0002] There are usually two ways to draw current from a cylindrical core. One is to use two covers, which are connected to the busbars and then welded to the core, and the current is finally drawn through the poles on the two covers. The other is to draw one pole to the battery case through the pole ear, and the case as a whole participates in the conduction as one pole. In the latter case, the busbar is usually a flat metal sheet, which is first welded to the core and then welded to the case to form a current path.
[0003] When the busbar is placed on the top or bottom of the battery cell, it is in close contact with the battery shell. During the battery filling process, the electrolyte cannot pass quickly through the busbar after passing through the third through hole in the middle of the core, affecting the filling efficiency and the subsequent penetration of the electrolyte into the core. At the same time, the energy required for welding the busbar to the battery shell is high, and the temperature rise during the welding process is large. The diaphragm here is easily in contact with the busbar, causing the diaphragm to melt, affecting the battery performance.
[0004] In summary, the existing battery cell structure has technical problems such as low liquid injection efficiency and easy damage of the core. Utility Model Content
[0005] In view of the shortcomings of the existing methods, the present application proposes a battery busbar and a cylindrical battery cell to solve the technical problems of low injection efficiency and easy damage of the winding core in the prior art.
[0006] In a first aspect, an embodiment of the present application provides a battery core busbar, including a busbar body and a central boss:
[0007] Busbar body;
[0008] A central boss, located at the center of the busbar body and protruding toward one side of the busbar body;
[0009] A first through hole is formed on the top surface of the central boss;
[0010] The second through hole is formed on the side wall of the central boss.
[0011] In some embodiments of the present application, the central boss has a boss top surface and a boss side wall, the boss top surface and the boss side wall are connected via a rounded transition, and the boss side wall and the busbar body are connected via a rounded transition.
[0012] In some embodiments of the present application, a plurality of mutually staggered concave portions and convex portions are distributed on the top surface of the central boss.
[0013] In some embodiments of the present application, the top surface of the boss forms a frosted surface or a wavy surface.
[0014] In some embodiments of the present application, the top surface of the central boss is an inclined surface, and the center protrusion height of the top surface of the boss is smaller than the edge protrusion height of the top surface of the boss.
[0015] In some embodiments of the present application, there are multiple second through holes, and the multiple second through holes are arranged along the circumference of the central boss.
[0016] In some embodiments of the present application, the distance and angle between any two adjacent second through holes are equal.
[0017] In some embodiments of the present application, a plurality of third through holes are further included, and the plurality of third through holes are opened on the busbar body and arranged along the circumference of the busbar body.
[0018] In some embodiments of the present application, the distance and angle between any two adjacent third through holes are equal.
[0019] In the second aspect, an embodiment of the present application further provides a cylindrical battery cell, comprising a winding core, a shell, and a battery cell bus as described in any embodiment of the first aspect, wherein the bus body in the battery cell bus is connected to the winding core, and the center boss is connected to the shell.
[0020] The beneficial technical effects brought about by the technical solution provided in the embodiment of the present application include: the embodiment of the present application designs a central boss to space a certain distance between the shell and the diaphragm of the core, thereby preventing the diaphragm from melting due to heat during the welding process between the shell and the battery cell bus bar, reducing the damage rate of the core, and ensuring the electrolyte channel when the electrolyte flows through this place; the central boss ensures that there is sufficient welding area between the battery cell bus bar and the shell, thereby reducing the resistance value; at the same time, the second through hole is designed to cooperate with the central boss to ensure that the electrolyte flows out of the central boss quickly, and then further penetrates into the core in other directions after flowing out, thereby improving the electrolyte injection efficiency and the later electrolyte penetration efficiency.
[0021] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:
[0023] Figure 1 It is a schematic diagram of the structure of a battery cell busbar in an embodiment of the present application.
[0024] Reference numerals:
[0025] 1-busbar body, 2-center boss;
[0026] 21 - first through hole, 22 - second through hole, 23 - third through hole. DETAILED DESCRIPTION
[0027] The embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the implementation methods described below in conjunction with the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.
[0028] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements, and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the technical field. It should be understood that when we refer to an element as being "connected" to another element, the element may be directly connected to the other element, or may refer to the element and the other element establishing a connection relationship through an intermediate element. In addition, the "connection" used herein may include a wireless connection.
[0029] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that the following implementation methods can refer to, learn from or combine with each other, and the same terms, similar features and similar implementation steps in different implementation methods will not be described repeatedly.
[0030] In view of the shortcomings of the existing methods, the present application proposes a battery busbar and a cylindrical battery cell to solve the technical problems of low injection efficiency and easy damage of the winding core in the prior art.
[0031] In a first aspect, an embodiment of the present application provides a battery busbar, such as Figure 1 As shown, Figure 1 It is a schematic diagram of the structure of a battery cell busbar in an embodiment of the present application.
[0032] A battery core busbar includes a busbar body 1 and a central boss 2:
[0033] Busbar body 1;
[0034] A central boss 2, located at the center of the busbar body 1 and protruding toward one side of the busbar body 1;
[0035] A first through hole 21 is formed on the top surface of the central boss 2;
[0036] The second through hole 22 is formed on the side wall of the central boss 2 .
[0037] In the embodiment of the present application, the central boss 2 is designed to space the shell and the diaphragm of the winding core by a certain distance, so as to prevent the diaphragm from being melted by heat during the welding process between the shell and the battery bus bar, thereby reducing the damage rate of the winding core and ensuring the electrolyte channel when the electrolyte flows through this place; the central boss 2 ensures that there is a sufficient welding area between the battery bus bar and the shell, thereby reducing the resistance value; at the same time, the second through hole 22 is designed to cooperate with the central boss 2, thereby ensuring that the electrolyte flows out of the central boss 2 quickly, and then further penetrates into the winding core in other directions after flowing out, thereby improving the electrolyte injection efficiency and the later electrolyte penetration efficiency.
[0038] In some embodiments of the present application, the central boss 2 has a boss top surface and a boss side wall, the boss top surface and the boss side wall are connected via a rounded transition, and the boss side wall and the busbar body 1 are connected via a rounded transition.
[0039] In this embodiment, the top surface of the central boss 2 is flat, and the protrusion height is the height difference between the top surface of the boss and the busbar body 1. The contact area between the central boss 2 and the housing is increased to avoid a gap between the central boss 2 and the housing.
[0040] In this embodiment, the side walls of the bosses and the top surface of the bosses and the busbar body 1 may be transitioned with rounded corners or chamfered corners, respectively, to prevent excessive stress concentration and improve structural reliability.
[0041] The side wall of the boss can be perpendicular to the busbar body 1, or can be an inclined flat plate. The side wall of the boss forms an obtuse angle with the top surface of the boss and the busbar body 1, respectively, so that the transition is smoother and the stability is improved.
[0042] In some embodiments of the present application, a plurality of mutually staggered concave portions and convex portions are distributed on the top surface of the central boss 2 .
[0043] In some embodiments of the present application, the top surface of the boss forms a frosted surface or a wavy surface.
[0044] In this embodiment, the top surface of the central boss 2 is not flat, but is formed into a frosted surface or a wavy surface through a plurality of concave and convex parts. During the welding process, the solder is filled in the concave parts of the frosted surface and the wavy surface. Compared with the combination of two flat surfaces, the concave parts can accommodate more solder, which can improve the connection stability between the shell and the boss. However, the height difference between the concave part and the convex part should not be too large to avoid the solder being unable to fill in, leaving a gap, which in turn affects the stability.
[0045] In some embodiments of the present application, the top surface of the central boss 2 is an inclined surface, and the center protrusion height of the top surface of the boss is smaller than the edge protrusion height of the top surface of the boss.
[0046] In this embodiment, the central boss 2 has no small concave and convex parts, but forms an inwardly concave cone as a whole. Similarly, the cone can accommodate more solder, which can improve the connection stability between the shell and the boss. However, the height difference between the top of the cone and the ground should not be too large to avoid the solder being unable to fill and leaving a gap, which in turn affects the stability.
[0047] In some embodiments of the present application, there are multiple second through holes 22 , and the multiple second through holes 22 are arranged along the circumference of the central boss 2 .
[0048] In some embodiments of the present application, the distance and angle between any two adjacent second through holes 22 are equal.
[0049] In this embodiment, a plurality of second through holes 22 are provided on the side wall of the central boss 2, which function similarly to the first through holes 21 to provide an outflow channel for the electrolyte, thereby preventing the size of the first through holes 21 from limiting the outflow efficiency and causing the electrolyte to flow out too low.
[0050] In some embodiments of the present application, a plurality of third through holes 23 are further included. The plurality of third through holes 23 are opened on the busbar body 1 and are arranged along the circumference of the busbar body 1 .
[0051] In some embodiments of the present application, the distance and angle between any two adjacent third through holes 23 are equal.
[0052] In this embodiment, the function of the third through holes 23 is that after the electrolyte flows out from the first through holes 21 and the second through holes 22 , it slowly infiltrates the winding core from the third through holes 23 in multiple directions, thereby improving the penetration efficiency of the electrolyte.
[0053] In the second aspect, an embodiment of the present application also provides a cylindrical battery cell, comprising a winding core, a shell, and a battery cell bus as described in any embodiment of the first aspect, wherein the bus body 1 in the battery cell bus is connected to the winding core, and the center boss 2 is connected to the shell.
[0054] Compared with the prior art, the application of the embodiments of the present application can at least achieve the following beneficial effects: the embodiments of the present application design the center boss 2 so that a certain distance is set between the shell and the diaphragm of the winding core, thereby preventing the diaphragm from melting due to heat during the welding process between the shell and the battery cell bus bar, reducing the damage rate of the winding core, and at the same time ensuring the electrolyte channel when the electrolyte flows through this place; the center boss 2 ensures that there is sufficient welding area between the battery cell bus bar and the shell, thereby reducing the resistance value; at the same time, the second through hole 22 is designed to cooperate with the center boss 2, thereby ensuring that the electrolyte flows out of the center boss 2 quickly, and then further penetrates into the winding core in other directions after flowing out, thereby improving the electrolyte injection efficiency and the later electrolyte penetration efficiency.
[0055] In the description of the present application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the exemplary directions or positional relationships shown in the accompanying drawings. They are for the convenience of describing or simplifying the description of the embodiments of the present application, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.
[0056] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0058] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.
[0059] The above is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the scheme of the present application, other similar implementation methods based on the technical ideas of the present application are also within the protection scope of the embodiments of the present application.
Claims
1. A battery busbar, characterized in that: include: Busbar body; A central boss, located at the center of the busbar body and protruding toward one side of the busbar body; A first through hole is formed on the top surface of the central boss; The second through hole is formed on the side wall of the central boss.
2. The battery core busbar according to claim 1, characterized in that: The central boss has a boss top surface and a boss side wall. The boss top surface and the boss side wall are connected via a rounded transition, and the boss side wall and the busbar body are connected via a rounded transition.
3. The battery core busbar according to claim 2, characterized in that: A plurality of mutually staggered concave portions and convex portions are distributed on the top surface of the central boss.
4. The battery core busbar according to claim 3, characterized in that: The top surface of the boss is formed into a frosted surface or a wavy surface.
5. The battery core busbar according to claim 2, characterized in that: The top surface of the central boss is an inclined surface, and the center protrusion height of the top surface of the boss is smaller than the edge protrusion height of the top surface of the boss.
6. The battery core busbar according to claim 1, characterized in that: There are multiple second through holes, and the multiple second through holes are arranged along the circumference of the central boss.
7. The battery core busbar according to claim 6, characterized in that: The distance and angle between any two adjacent second through holes are equal.
8. The battery core busbar according to claim 1, characterized in that: It also includes a plurality of third through holes, which are opened on the busbar body and arranged along the circumference of the busbar body.
9. The battery core busbar according to claim 8, characterized in that: The distance and angle between any two adjacent third through holes are equal.
10. A cylindrical battery cell, characterized in that: It comprises a winding core, a shell and a cell busbar as claimed in any one of claims 1 to 9, wherein the busbar body in the cell busbar is connected to the winding core, and the central boss is connected to the shell.