Battery cell

Abstract

The utility model provides a battery cell, and relates to the technical field of batteries. The battery cell comprises a main body and an anti-explosion valve for releasing pressure; the main body comprises a shell, a first end cover and a second end cover; the interior of the shell is of a hollow structure, the first end cover and the second end cover are arranged at the two ends of the shell respectively, and the first end cover and the second end cover are both connected with the shell in a sealed mode; a liquid injection hole is formed in the main body; wherein the anti-explosion valve is arranged on the liquid injection hole to seal the liquid injection hole. The explosion-proof valve not only can seal the liquid injection hole, but also has a pressure relief effect, so that a mounting hole for mounting the explosion-proof valve does not need to be additionally formed in the battery cell, the manufacturing process of the battery cell is simplified, the manufacturing efficiency of the battery cell is improved, and the manufacturing cost of the battery cell is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell. Background Art

[0002] The battery cell production process includes the electrolyte injection process and the explosion-proof valve installation process. The electrolyte injection process involves injecting electrolyte into the battery cell. After the electrolyte injection is completed, a sealing pin is inserted into the electrolyte injection hole and then laser welded to seal the electrolyte injection hole. The explosion-proof valve installation process involves creating a mounting hole in the battery cell end cap and covering the explosion-proof valve with it. The explosion-proof valve is then secured and sealed by laser welding.

[0003] The liquid injection process and explosion-proof valve installation process are both relatively cumbersome to operate, and how to simplify the process to improve the manufacturing efficiency of battery cells is an urgent problem that needs to be solved. Utility Model Content

[0004] The purpose of this application is to overcome the defects of the prior art and provide a battery cell to solve the problems in the prior art.

[0005] To solve the above problems, an embodiment of the present application provides a battery cell, comprising a main body and an explosion-proof valve for pressure relief;

[0006] The main body includes a shell, a first end cover and a second end cover;

[0007] The interior of the shell is a hollow structure, the first end cover and the second end cover are respectively provided at both ends of the shell, and the first end cover and the second end cover are both sealed and connected to the shell;

[0008] The main body is provided with a liquid injection hole; wherein, the explosion-proof valve is provided on the liquid injection hole to seal the liquid injection hole.

[0009] In a possible implementation manner, the explosion-proof valve is a sheet-like structure, and the explosion-proof valve covers the liquid injection hole; wherein the explosion-proof valve is welded to the main body and is sealed.

[0010] In a possible embodiment, the liquid injection hole includes a liquid injection end and a liquid outlet end, and the liquid injection end and the liquid outlet end are respectively located at two ends of the liquid injection hole in a depth direction; wherein the explosion-proof valve covers the liquid injection end.

[0011] In a possible implementation, the liquid injection end is located outside the main body, and the liquid outlet end is located inside the main body; wherein, the cross-sectional area of ​​the liquid injection hole gradually increases from the liquid injection end to the liquid outlet end.

[0012] In a possible implementation manner, a mounting hole is provided on the main body, wherein the explosion-proof valve is provided in the mounting hole;

[0013] The mounting hole is coaxial with the liquid injection hole, and the mounting hole is adjacent to and directly connected to the liquid injection end; wherein the cross-sectional area of ​​the mounting hole is larger than the cross-sectional area of ​​the liquid injection end.

[0014] In a possible implementation manner, a depth of the mounting hole is greater than or equal to a maximum thickness of the explosion-proof valve.

[0015] In a possible implementation manner, the first end cover and the second end cover are both provided with the liquid injection hole, wherein the liquid injection hole is communicated with the inner cavity of the shell.

[0016] In a possible embodiment, a first opening and a second opening are respectively provided at both ends of the shell;

[0017] The first end cover is disposed on the first opening to close the first opening;

[0018] The second end cover is disposed on the second opening to close the second opening.

[0019] In a possible implementation manner, both the first end cover and the second end cover are provided with poles, wherein each pole is provided with the liquid injection hole.

[0020] In a possible implementation manner, the pole is cylindrical, and the injection hole is coaxial with the corresponding pole.

[0021] The beneficial effects of this application include:

[0022] The battery cell proposed in this application includes a main body and an explosion-proof valve for pressure relief, wherein the main body is provided with a liquid injection hole, wherein the explosion-proof valve is provided on the liquid injection hole to seal the liquid injection hole.

[0023] In addition to sealing the liquid injection hole, the explosion-proof valve also serves to relieve pressure. As a result, there is no need to open additional installation holes on the battery cell for installing the explosion-proof valve, thereby simplifying the manufacturing process of the battery cell, improving the manufacturing efficiency of the battery cell and reducing the manufacturing cost of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A first schematic diagram of a battery cell is shown;

[0026] Figure 2 Shown Figure 1 Second schematic diagram of the battery cell;

[0027] Figure 3 Shown Figure 1 Cross-sectional view of the battery cell;

[0028] Figure 4 A first schematic diagram of a housing is shown;

[0029] Figure 5 Shown Figure 4 Second schematic diagram of the middle housing.

[0030] Description of main component symbols:

[0031] 100-main body; 101-liquid injection hole; 1011-liquid injection end; 1012-liquid outlet end; 102-mounting hole; 110-housing; 111-first opening; 112-second opening; 120-first end cover; 130-second end cover; 140-pole; 200-explosion-proof valve. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] Example

[0035] See Figure 1 and Figure 2 In this embodiment, a battery cell is proposed, including a main body 100 and an explosion-proof valve 200 for pressure relief.

[0036] The main body 100 includes a housing 110, a first end cap 120, and a second end cap 130. The interior of the housing 100 is a hollow structure, thereby allowing materials such as the diaphragm and electrolyte to be placed and stored within the housing 100. The first end cap 120 and the second end cap 130 are respectively disposed at both ends of the housing 110 and are both sealed to the housing 110, thereby achieving a sealed interior of the housing 100.

[0037] The explosion-proof valve 200 provides pressure relief. When a battery cell experiences an abnormality, the electrolyte and other chemical substances within it rapidly decompose and produce a large amount of gas, causing the pressure inside the cell to rise sharply. When the pressure inside the cell reaches the burst pressure threshold of the explosion-proof valve 200, the valve 200 ruptures to release the gas inside the cell, thereby achieving the purpose of pressure relief and preventing the cell from exploding due to excessive internal pressure.

[0038] In this embodiment, a liquid injection hole 101 is provided on the main body 100 , and an explosion-proof valve 200 is provided on the liquid injection hole 101 to seal the liquid injection hole 101 .

[0039] Electrolyte can be injected into the main body 100 through the injection hole 101. After the electrolyte is injected, the injection hole 101 is sealed using the explosion-proof valve 200. This not only completes the installation of the explosion-proof valve 200, but also completes the sealing of the injection hole 101. This reduces manufacturing costs, simplifies the process, and improves the production efficiency of the battery cell.

[0040] The explosion-proof valve 200 is a sheet-like structure, and covers the liquid injection hole 101. The explosion-proof valve 200 is welded and sealed to the main body 100. The specific structure of the explosion-proof valve 200 can refer to the existing design and will not be described in detail herein.

[0041] like Figure 3 As shown, the liquid injection hole 101 includes a liquid injection end 1011 and a liquid outlet end 1012 , which are respectively disposed at two ends in the depth direction of the liquid injection hole 101 , wherein the explosion-proof valve 200 covers the liquid injection end 1011 .

[0042] The liquid injection end 1011 is located outside the main body 100, and the liquid outlet end 1012 is located inside the main body 100. The cross-sectional area of ​​the liquid injection hole 101 gradually increases from the liquid injection end 1011 to the liquid outlet end 1012.

[0043] When a battery cell experiences an abnormality, a large amount of gas generated within the cell flows into the liquid injection hole 101 and then flows from the liquid outlet 1012 to the liquid injection end 1011. When the pressure within the cell reaches the burst pressure threshold of the explosion-proof valve 200, the explosion-proof valve 200 covering the liquid injection hole 101 ruptures, allowing the gas to escape from the cell. Because the cross-sectional area of ​​the liquid injection hole 101 gradually increases from the liquid injection end 1011 to the liquid outlet 1012, the gas flow rate increases as it flows from the liquid outlet 1012 to the liquid injection end 1011, thereby accelerating the gas discharge.

[0044] like Figure 3 As shown, in this embodiment, a mounting hole 102 is provided on the main body 100, wherein the explosion-proof valve 200 is disposed in the mounting hole 102. The presence of the mounting hole 102 facilitates the installation and positioning of the explosion-proof valve 200.

[0045] The mounting hole 102 is coaxial with the liquid injection hole 101 and is adjacent to and directly connected to the liquid injection end 1011 , wherein the cross-sectional area of ​​the mounting hole 102 is larger than the cross-sectional area of ​​the liquid injection end 1011 .

[0046] The depth of the mounting hole 102 is greater than or equal to the maximum thickness of the explosion-proof valve 200. This allows the explosion-proof valve 200 to be completely installed within the mounting hole 102, preventing it from protruding from the mounting hole 102 and thus protecting the explosion-proof valve 200. If the explosion-proof valve 200 protrudes from the mounting hole 102, the portion of the explosion-proof valve 200 protruding from the mounting hole 102 could be damaged by scratches or other factors during the transportation of battery cells, rendering the explosion-proof valve 200 inoperable.

[0047] like Figure 1 As shown, in this embodiment, the main body 100 is cylindrical. The main body 100 includes a housing 110, a first end cap 120, and a second end cap 130, respectively disposed at opposite ends of the housing 110. Each of the first and second end caps 120, 130 is provided with a liquid injection hole 101, which communicates with the inner cavity of the housing 110. The explosion-proof valves 200 correspond one-to-one with the liquid injection holes 101.

[0048] The interior of the housing 110 is a hollow structure, wherein the first end cover 120 and the second end cover 130 are welded to the housing 110 and are sealed.

[0049] like Figure 4 and Figure 5As shown, a first opening 111 and a second opening 112 are respectively provided at both ends of the housing 110. A first end cap 120 is provided to cover the first opening 111 and is fixedly connected to the housing 110 by welding to seal the first opening 111. A second end cap 130 is provided to cover the second opening 112 and is fixedly connected to the housing 110 by welding to seal the second opening 112.

[0050] In this embodiment, poles 140 are provided on both the first end cap 120 and the second end cap 130, wherein each pole 140 is provided with a liquid injection hole 101. In actual operation, one of the liquid injection holes 101 is sealed in advance using an explosion-proof valve 200, and then liquid is injected through the other liquid injection hole 101. After the liquid injection operation is completed, the unsealed liquid injection hole 101 is sealed using the other explosion-proof valve 200.

[0051] The pole 140 is cylindrical, and the injection hole 101 is coaxial with the corresponding pole 140. The cross section of the injection hole 101 is circular, elliptical or polygonal, wherein the polygon includes a quadrilateral, a pentagon, a hexagon and the like.

[0052] In this embodiment, the liquid injection hole 101 and the mounting hole 102 are both provided on the pole 140 .

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0054] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cell, characterized in that: It includes a main body and an explosion-proof valve for pressure relief; The main body includes a shell, a first end cover and a second end cover; The interior of the shell is a hollow structure, the first end cover and the second end cover are respectively provided at both ends of the shell, and the first end cover and the second end cover are both sealed and connected to the shell; The main body is provided with a liquid injection hole; wherein, the explosion-proof valve is provided on the liquid injection hole to seal the liquid injection hole.

2. The battery cell according to claim 1, characterized in that The explosion-proof valve is a sheet-like structure, and the explosion-proof valve covers the liquid injection hole; wherein the explosion-proof valve is welded to the main body and is sealed.

3. The battery cell according to claim 2, characterized in that The liquid injection hole includes a liquid injection end and a liquid outlet end, and the liquid injection end and the liquid outlet end are respectively arranged at two ends of the liquid injection hole in a depth direction; wherein the explosion-proof valve covers the liquid injection end.

4. The battery cell according to claim 3, characterized in that The liquid injection end is located outside the main body, and the liquid outlet end is located inside the main body; wherein, the cross-sectional area of ​​the liquid injection hole gradually increases from the liquid injection end to the liquid outlet end.

5. The battery cell according to claim 3, characterized in that: The main body is provided with a mounting hole, wherein the explosion-proof valve is arranged in the mounting hole; The mounting hole is coaxial with the liquid injection hole, and the mounting hole is adjacent to and directly connected to the liquid injection end; wherein the cross-sectional area of ​​the mounting hole is larger than the cross-sectional area of ​​the liquid injection end.

6. The battery cell according to claim 5, characterized in that The depth of the mounting hole is greater than or equal to the maximum thickness of the explosion-proof valve.

7. The battery cell according to claim 1, characterized in that The first end cover and the second end cover are both provided with the liquid injection hole, wherein the liquid injection hole is communicated with the inner cavity of the shell.

8. The battery cell according to claim 7, characterized in that: The two ends of the shell are respectively provided with a first opening and a second opening; The first end cover is disposed on the first opening to close the first opening; The second end cover is disposed on the second opening to close the second opening.

9. The battery cell according to claim 7, characterized in that: The first end cover and the second end cover are both provided with poles, wherein each pole is provided with the injection hole.

10. The battery cell according to claim 9, characterized in that: The pole is cylindrical, and the injection hole is coaxial with the corresponding pole.

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