Cylindrical battery cover plate and cylindrical battery
By adding a Tesla valve at the injection port of the cylindrical battery cover, the problem of difficulty in injection caused by limited space of the cylindrical battery is solved, and the battery's liquid retention ability and electrochemical performance are improved.
Patent Information
- Application Number
- CN202421134576.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The space of the cylindrical battery is limited, which makes it difficult for some electrolyte to enter the inside of the shell. Although the prior art has improved by improving the positive pressure or the number of infiltration cycles, the effect is not significant.
Add a Tesla valve at the injection port of the cylindrical battery cover plate. The Tesla valve is welded and connected to the cover plate body to ensure that the electrolyte flows smoothly during injection, and slows down the liquid discharge after the electrolyte is injected, increasing the battery's liquid retention ability.
It effectively improves the problem of difficulty in filling liquid in cylindrical batteries, increases the liquid retention capacity of the battery, improves the electrochemical performance, and does not affect gas discharge.
Smart Images
Figure CN222562940U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery cover and a cylindrical battery. Background Art
[0002] With the rapid development of society, the new energy industry has received much attention. Lithium-ion cylindrical batteries are widely used in the field of power batteries due to their high energy density, good consistency, and safety. Since lithium-ion cylindrical batteries mostly use high-strength steel shells and have limited internal space, compared with soft-pack batteries, cylindrical batteries are far from reaching the liquid retention coefficient of 2.0g / Ah of soft-pack batteries, which affects the cycle life and fast charging performance of cylindrical batteries. Therefore, how to improve the liquid retention coefficient of cylindrical batteries is crucial.
[0003] At present, the conventional method of injecting liquid into cylindrical batteries is to inject liquid multiple times. During the injection process, positive pressure is applied to squeeze the electrolyte into the cylindrical shell, and then the electrolyte is allowed to fully infiltrate the electrodes by standing at high temperature. However, due to the limited space of cylindrical batteries, it is difficult for some electrolytes to enter the shell. Although there is some improvement by improving the positive pressure or the number of infiltration cycles, the improvement effect is not significant. Utility Model Content
[0004] Based on this, it is necessary to address the technical problem that the space of the current cylindrical battery is limited, making it difficult for some electrolytes to enter the interior of the shell. Although the improvement is made by improving the positive pressure or the number of infiltration cycles, the improvement effect is not significant. The utility model provides a cylindrical battery cover and a cylindrical battery.
[0005] The utility model provides a cylindrical battery cover plate, which comprises a cover plate body, a liquid injection port is provided on the cover plate body, and the cylindrical battery cover plate also comprises a Tesla valve, which is connected to the cover plate body and its inlet is connected to the liquid injection port.
[0006] As a further improvement of the above solution of the utility model, the Tesla valve is welded to the cover plate body.
[0007] The utility model provides a cylindrical battery, which comprises the cylindrical battery cover plate as mentioned above.
[0008] As a further improvement of the above scheme of the utility model, it also includes a shell with one end open, the cover body is sealed and connected with the open end of the shell, and the Tesla valve is located inside the shell, and the electrolyte is injected into the shell through the liquid filling port and the Tesla valve.
[0009] As a further improvement of the above solution of the utility model, it also includes a battery core, and the battery core is arranged in the shell.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] The utility model adds a Tesla valve at the liquid filling port of the cover plate, so that the electrolyte inflow process is not hindered during liquid filling, which effectively improves the problem of difficult liquid filling of cylindrical batteries. At the same time, through the design of the Tesla valve, the electrolyte is not easy to bubble out after injection, thereby increasing the liquid retention capacity of the battery. In addition, the design of the Tesla valve does not affect the discharge of the gas generated during the formation of the cylindrical battery, which is beneficial to improving the electrochemical performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 A schematic diagram of the structure of a cylindrical battery cover plate proposed in an embodiment of the utility model;
[0013] Figure 2 This is a schematic diagram of the flow direction of the electrolyte in the Tesla valve when the electrolyte is injected into the embodiment of the utility model;
[0014] Figure 3 This is a schematic diagram of the flow direction of the electrolyte in the Tesla valve when the electrolyte is bubbling in an embodiment of the present utility model.
[0015] Figure numerals: 1. cover plate body; 2. liquid filling port; 3. Tesla valve. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] This embodiment aims to solve the technical problem that the space of cylindrical batteries is limited, which makes it difficult for some electrolytes to enter the interior of the shell. Although the positive pressure or the number of infiltration cycles is improved, the improvement effect is not significant. A cylindrical battery cover is provided for cylindrical batteries, which can improve the problem of difficulty in injecting electrolyte into cylindrical batteries.
[0018] Reference Figure 1 The cylindrical battery cover of this embodiment includes a cover body 1 and a Tesla valve 3. A liquid injection port 2 for liquid injection is provided through the cover body 1. The Tesla valve 3 is welded to the cover body 1 and the inlet of the Tesla valve 3 is connected to the liquid injection port 2. In this embodiment, the Tesla valve 3 is a prior art and is a special fluid control device that allows the fluid to flow smoothly in one direction and provides great resistance or completely prevents the flow in the opposite direction.
[0019] Through the above structural design, when the cylindrical battery adopts the cylindrical battery cover designed in this embodiment, when injecting liquid, Figure 2 As shown, the electrolyte is injected from the injection port 2 and flows into the outer shell of the cylindrical battery through the Tesla valve 3 without any obstruction during the flow process.
[0020] In addition, usually after the first injection and formation of cylindrical batteries, rubber nails will be inserted for aging process to achieve the purpose of process sealing, but the aging process may be accompanied by gas generation, which will cause liquid to leak when the rubber nails are pulled out during the second injection. Figure 3 As shown, the electrolyte flows out from the Tesla valve 3 in the reverse direction, which will cause part of the direct current to hinder the flow of the main channel, thereby forming a reverse force, thereby slowing down the electrolyte bubbling phenomenon, and the gas generated during the formation can be directly discharged through the Tesla valve 3. In this embodiment, the Tesla valve 3 is added at the liquid injection port 2, so that the electrolyte is not easy to bubble out after injection, thereby increasing the battery's liquid retention capacity and improving the battery's electrochemical performance.
[0021] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.
[0023] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0024] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A cylindrical battery cover, comprising a cover body (1), a liquid injection port (2) being provided on the cover body (1), characterized in that: The cylindrical battery cover plate further comprises a Tesla valve (3), which is connected to the cover plate body (1) and whose inlet is connected to the liquid injection port (2).
2. The cylindrical battery cover according to claim 1, characterized in that: The Tesla valve (3) is connected to the cover plate body (1) by welding.
3. A cylindrical battery, characterized in that: It comprises the cylindrical battery cover plate as claimed in claim 1 or 2.
4. The cylindrical battery according to claim 3, characterized in that: It also includes a shell with one end open, a cover body (1) is sealed and connected to the open end of the shell, and a Tesla valve (3) is located inside the shell, and electrolyte is injected into the shell through the liquid injection port (2) and the Tesla valve (3).
5. The cylindrical battery according to claim 4, characterized in that: It also includes a battery core, which is arranged in the shell.