Top cover and battery cell
By setting injection holes and guide slopes on the top cover of the battery cell, the problem of difficult electrolyte injection caused by direct contact between the top cover and the cell is solved, achieving efficient electrolyte injection and preventing splashing, thus ensuring the safety and stability of the battery cell.
Patent Information
- Application Number
- CN202422543007.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-21
AI Technical Summary
The problem of difficulty in injecting electrolyte arises from the direct contact between the top cover of the battery cell and the internal winding core.
Design a top cover that increases the gap between the top cover and the core by setting an injection hole on the top cover and forming a guide slope on a part of the thickness of the top cover. The guide slope is used to guide the electrolyte and improve the splashing problem during the injection process.
It effectively solves the problem of difficult electrolyte injection, improves the efficiency of electrolyte injection, prevents electrolyte splashing, and ensures the safe and stable operation of battery cells.
Smart Images
Figure CN223502015U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a top cover and a battery cell. Background Technology
[0002] The top cover of a battery cell is usually located on top of the cell. In order to save internal space, the gap between the top cover and the core inside the cell is usually reduced. This can easily lead to direct contact between the core and the top cover, causing the core to block the liquid injection hole on the top cover, resulting in difficulty in liquid injection. Utility Model Content
[0003] To address the aforementioned technical problems, embodiments of this application provide a top cover and a battery cell that can improve the difficulty of liquid injection.
[0004] In a first aspect, a top cover is provided, having a liquid injection hole penetrating the top cover, the top cover comprising:
[0005] First edge section;
[0006] The second edge portion is disposed opposite to the first edge portion along the first direction;
[0007] A protrusion is provided between the first edge portion and the second edge portion;
[0008] Wherein, the injection hole is located at the first edge portion and / or the second edge portion; or, the injection hole is located between the first edge portion and the second edge portion;
[0009] Wherein, the thickness of the portion between the protrusion and the first edge gradually decreases along the second direction to form a first guide slope; and / or, the thickness of the portion between the protrusion and the second edge gradually decreases along the third direction to form a second guide slope.
[0010] According to a first aspect of this application, the top cover is further provided with a clearance groove, the clearance groove extending through the first guide slope and the second guide slope along the first direction, such that the opposite ends of the clearance groove extend to the first edge portion and the second edge portion respectively, and the injection hole is located in the area of the clearance groove.
[0011] According to a first aspect of this application, both the first edge portion and the second edge portion are provided with the injection hole, and the injection hole at the first edge portion and the injection hole at the second edge portion are symmetrically distributed about the protrusion.
[0012] According to a first aspect of this application, the injection hole includes a first hole segment and a second hole segment, the first hole segment communicating with the second hole segment, and the first hole segment being closer to the protrusion relative to the second hole segment; wherein the inner diameter of the second hole segment is larger than the inner diameter of the first hole segment.
[0013] According to a first aspect of this application, the injection hole includes a first port and a second port opposite to each other, the first port being closer to the protrusion than the second port; wherein, in the direction from the first port to the second port, the inner diameter of the injection hole gradually increases.
[0014] According to a first aspect of this application, the protrusion is provided with a platform surface, and the opposite sides of the platform surface are respectively connected to the first guide slope and the second guide slope; wherein the platform surface is distributed parallel to the fourth direction.
[0015] According to a first aspect of this application, the first guide ramp and the second guide ramp are symmetrically arranged about the platform surface.
[0016] According to a first aspect of this application, the thickness of the protrusion is X, the thickness of the first edge portion is Y, and the thickness of the second edge portion is Z;
[0017] Wherein, X and Y satisfy: 0.5mm ≤ XY ≤ 1.5mm;
[0018] The X and Z satisfy: 0.5mm ≤ XZ ≤ 1.5mm;
[0019] The Y and Z satisfy: 1.5mm≤Y≤3mm, 1.5mm≤Z≤3mm.
[0020] According to a first aspect of this application, the surfaces of the protrusion, the first guide slope, and the second guide slope are provided with an insulating layer.
[0021] According to a first aspect of this application, the top cover is provided with an explosion-proof valve mounting hole.
[0022] According to a first aspect of this application, the top cover is provided with pole mounting holes.
[0023] Secondly, a battery cell is also provided, comprising:
[0024] case;
[0025] As described in the previous embodiment, the top cover is disposed on the top of the housing, and the protrusion, the first guide slope, and the second guide slope are disposed facing the housing.
[0026] The top cover and battery cell provided in this application embodiment, based on related technologies, have a portion of the top cover thinned to form a first guiding slope and a second guiding slope. This has two advantages: First, it increases the gap between the top cover and the top of the core, improving the problem of direct contact between them and effectively alleviating the difficulty of electrolyte injection. Second, during the electrolyte injection process, when the electrolyte passes through the injection hole, the first and second guiding slopes guide the electrolyte, improving the problem of electrolyte splashing during injection. Attached Figure Description
[0027] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0028] Figure 1 A schematic diagram of the top cover provided in an exemplary embodiment of this application from a first perspective.
[0029] Figure 2 A schematic diagram of the top cover provided in an exemplary embodiment of this application from a second perspective.
[0030] Figure 3 This is a schematic diagram of the top cover provided in an exemplary embodiment of this application from a third-person perspective.
[0031] Figure 4 A schematic diagram of the top cover provided for another exemplary embodiment of this application.
[0032] Figure 5 A cross-sectional view of the top cover provided for an exemplary embodiment of this application.
[0033] Figure 6 A cross-sectional view of the top cover provided for another exemplary embodiment of this application.
[0034] Figure 7 A cross-sectional view of the top cover provided for another exemplary embodiment of this application.
[0035] Figure 8 A cross-sectional view of the top cover provided for another exemplary embodiment of this application.
[0036] Reference numerals: 100-Top cover; 110-First edge; 120-Second edge; 130-Protrusion; 131-Platform surface; 140-First guide slope; 150-Second guide slope; 160-Allowing groove; 170-Injection hole; 171-First hole section; 172-Second hole section; 173-First port; 174-Second port; 180-Explosion-proof valve mounting hole; 190-Pole mounting hole. Detailed Implementation
[0037] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0038] This application provides a battery cell that includes a housing and a top cover. The housing houses the battery cell, and the top cover is located on top of the housing. In related technologies, the top cover can easily come into direct contact with the top of the winding core inside the battery cell, causing the core to block the electrolyte filling hole on the top cover and resulting in difficulty in electrolyte filling. Therefore, the battery cell and top cover provided in this application can improve the problem of difficult electrolyte filling. The top cover is described in detail below.
[0039] Figure 1 A schematic diagram of the top cover provided in an exemplary embodiment from a first perspective. Figure 2 A schematic diagram of the top cover provided in an exemplary embodiment of this application from a second perspective. Figure 3 This is a schematic diagram of the top cover provided in an exemplary embodiment of this application from a third-person perspective. Figures 1 to 3 As shown, the top cover 100 provided in this embodiment of the application is provided with a liquid injection hole 170, which penetrates the top cover 100. In practical applications, electrolyte can be injected into the battery cell through the liquid injection hole 170.
[0040] like Figures 1 to 3 As shown, the top cover 100 may include a first edge portion 110, a second edge portion 120, and a protrusion 130, the first edge portion 110 and the second edge portion 120 being along a first direction ( Figure 1 and Figure 2 The protrusion 130 is disposed between the first edge portion 110 and the second edge portion 120, with the directions indicated by the middle arrows A and B being relatively opposite to each other.
[0041] In one embodiment, the injection hole 170 is disposed between the first edge portion 110 and the second edge portion 120 (e.g., Figure 1 and Figure 2 (As shown).
[0042] In one embodiment, the injection hole 170 may also be provided on the first edge portion 110 and / or the second edge portion 120 (e.g., Figure 4 As shown below, this will be discussed in detail later.
[0043] like Figures 1 to 3 As shown, in one embodiment, the thickness of the portion between the protrusion 130 and the first edge portion 110 is along the second direction ( Figure 3 The thickness of the top cover 100 is gradually reduced (in the direction indicated by the middle arrow C) to form the first guide slope 140. That is, based on related technologies, the thickness of a portion of the top cover 100 is reduced to form the first guide slope 140. In this way, firstly, the gap between the top cover 100 and the top of the core can be increased, improving the problem of direct contact between the top cover 100 and the top of the core, thereby effectively improving the problem of difficult liquid injection; secondly, the protrusion 130 and the first guide slope 140 are arranged towards the housing. During the liquid injection process, when the electrolyte passes through the injection hole 170, the first guide slope 140 can guide the electrolyte, improving the problem of electrolyte splashing during the liquid injection process.
[0044] like Figures 1 to 3 As shown, in one embodiment, the thickness of the portion between the protrusion 130 and the second edge portion 120 is along a third direction ( Figure 3 The thickness of the top cover 100 is gradually reduced (in the direction indicated by the middle arrow E) to form the second guide slope 150. That is, based on related technologies, the thickness of a portion of the top cover 100 is reduced to form the second guide slope 150. This has two advantages: First, it increases the gap between the top cover 100 and the top of the core, improving the problem of direct contact between them and effectively alleviating the difficulty of electrolyte injection. Second, since the protrusion 130 and the second guide slope 150 are oriented towards the housing, during electrolyte injection, when the electrolyte passes through the injection hole 170, the second guide slope 150 can guide the electrolyte, improving the problem of electrolyte splashing during injection.
[0045] In one embodiment, the first guide slope 140 and the second guide slope 150 can be provided simultaneously, or only one of them can be provided.
[0046] In one embodiment, the slopes of the first guide slope 140 and the second guide slope 150 may be the same or different.
[0047] In one embodiment, the surfaces of the protrusion 130, the first guide slope 140, and the second guide slope 150 are provided with an insulating layer, which can prevent short circuits from occurring after the top cover 100 comes into contact with the core, ensuring that the battery cell can operate safely and stably.
[0048] It should be understood that if the insulation layer is too thin, its insulation capacity is weak, which can easily lead to a short circuit between the top cover 100 and the core; if the insulation layer is too thick, it will encroach on the gap between the top cover 100 and the top of the core, affecting the liquid injection efficiency. Therefore, it is necessary to limit the thickness of the insulation layer within a certain range. Specifically, the thickness N of the insulation layer satisfies the following condition: 0.001mm ≤ N ≤ 0.5mm. This ensures the insulation effect of the insulation layer while reducing the amount of space encroached upon by the insulation layer between the top cover 100 and the top of the core.
[0049] like Figures 1 to 3 As shown, the protrusion 130 is provided with a platform surface 131, and the opposite sides of the platform surface 131 are respectively connected to the first guide slope 140 and the second guide slope 150, and the platform surface 131 is connected to the fourth direction ( Figure 1 and Figure 2 The directions indicated by the middle arrows G and H) are parallel.
[0050] In practical applications, the top cover 100 is assembled on the top of the battery cell, and the platform surface 131 abuts against the top of the battery cell. In this way, after the top cover 100 is assembled on the top of the battery cell, it is not easy for it to tilt, which can improve the assembly stability and accuracy of the top cover 100.
[0051] In one embodiment, the width (distance along the first direction) of the platform surface 131 is K, K≥2mm, which can effectively prevent the top cover 100 from tilting relative to the battery cell after assembly.
[0052] like Figure 3 As shown, the first guide slope 140 and the second guide slope 150 are symmetrically arranged about the platform surface 131. In this way, firstly, the counterweight on both sides of the platform surface 131 is basically the same, so that the top cover 100 is not likely to tilt to one side after assembly; secondly, the symmetrical structure can also make the top cover 100 more evenly stressed after assembly, and it is not easy for local stress concentration to occur, thus extending the service life of the top cover 100.
[0053] In one embodiment, the length of the first guide ramp 140 along the second direction may be greater than the length of the second guide ramp 150 along the third direction.
[0054] In one embodiment, the length of the first guide ramp 140 along the second direction may be less than the length of the second guide ramp 150 along the third direction.
[0055] like Figure 2 As shown, the top cover 100 is also provided with a clearance groove 160, the clearance groove 160 being along the first direction ( Figure 2The direction indicated by the middle arrows A and B) passes through the first guide slope 140 and the second guide slope 150, and the opposite ends of the relief groove 160 extend to the first edge portion 110 and the second edge portion 120 respectively, and the injection hole 170 is located in the area of the relief groove 160.
[0056] It should be noted that during the electrolyte injection process, the clearance groove 160 can serve as an electrolyte injection channel. The electrolyte through the injection hole 170 can be evenly diffused to different parts of the core through the clearance groove 160, ensuring that different parts of the core can fully contact the electrolyte.
[0057] In one embodiment, the number of clearance slots 160 can be one, two, three, etc.
[0058] In one embodiment, the number of injection holes 170 within the same clearance groove 160 can be one, two, three, etc.
[0059] It should be noted that if the width (distance along the fourth direction) of the clearance groove 160 is too small, the electrolyte may not be able to diffuse quickly during the injection process, resulting in electrolyte accumulation within the clearance groove 160 and thus affecting the injection efficiency. Therefore, the width M of the clearance groove 160 can be limited to the following range: M≥2mm. This can effectively ensure that the electrolyte diffuses quickly within the clearance groove 160, improving the injection efficiency.
[0060] like Figure 1 and Figure 2 As shown, the top cover 100 is also provided with an explosion-proof valve mounting hole 180. It should be noted that after the explosion-proof valve is installed in the explosion-proof valve mounting hole 180, the bottom of the explosion-proof valve will not protrude from the top cover 100. That is to say, the bottom of the explosion-proof valve is further away from the top of the core relative to the platform surface 131. In this way, the top of the explosion-proof valve can be prevented from encroaching on the gap between the top cover 100 and the top of the core, thus ensuring the liquid injection efficiency.
[0061] like Figure 1 and Figure 2 As shown, the top cover 100 is also provided with a pole mounting hole 190. The pole is assembled in the pole mounting hole 190. One end of the pole can be used to connect to the battery cell, and the other end of the pole can be used to connect to other electrical components.
[0062] like Figure 3 As shown, the thickness X of the protrusion 130, the thickness Y of the first edge portion 110, and the thickness Z of the second edge portion 120 are shown.
[0063] Firstly, if the difference between thickness X and thickness Y is large, the slope of the first guide slope 140 will be large, thus preventing the first guide slope 140 from fulfilling its aforementioned function of preventing electrolyte splashing. If the difference between thickness X and thickness Y is small, the gap between the top cover 100 and the top of the core will be small, still affecting the electrolyte injection process. Therefore, it is necessary to limit the difference between thickness X and thickness Y within a certain range. Specifically, the difference between thickness X and thickness Y satisfies the following condition: 0.5mm ≤ XY ≤ 1.5mm. This way, the first guide slope 140 can be used to guide electrolyte diffusion, improving the electrolyte splashing problem, while also ensuring that the gap between the top cover 100 and the top of the core meets the electrolyte injection requirements, improving the difficulty of electrolyte injection.
[0064] Secondly, if the difference between thickness X and thickness Z is large, the slope of the second guide slope 150 will be large, thus preventing it from effectively preventing electrolyte splashing. Conversely, if the difference is small, the gap between the top cover 100 and the top of the core will be small, still affecting the electrolyte injection process. Therefore, it is necessary to limit the difference between thickness X and thickness Z within a certain range. Specifically, the difference between thickness X and thickness Z should satisfy the following condition: 0.5mm ≤ XZ ≤ 1.5mm. This ensures that the second guide slope 150 can guide electrolyte diffusion, improving the electrolyte splashing problem, while also guaranteeing that the gap between the top cover 100 and the top of the core meets the injection requirements, thus alleviating injection difficulties.
[0065] Thirdly, if the thicknesses Y and Z are too small, the overall structural strength of the top cover 100 will be low, making it prone to deformation. If the thicknesses Y and Z are too large, the first edge portion 110 and the second edge portion 120 will encroach on the gap between the top cover 100 and the top of the core, resulting in a smaller gap that will still affect the liquid injection process. Therefore, it is necessary to limit the thicknesses Y and Z within a certain range. Specifically, the thicknesses Y and Z satisfy the following conditions: 1.5mm ≤ Y ≤ 3mm, 1.5mm ≤ Z ≤ 3mm. This ensures both the structural strength of the top cover 100 and that the gap between the top cover 100 and the top of the core meets the liquid injection requirements, thus improving the problem of difficult liquid injection.
[0066] Figure 4 A schematic diagram of the top cover provided for another exemplary embodiment of this application. (See diagram below.) Figure 4 As shown, both the first edge portion 110 and the second edge portion 120 are provided with injection holes 170. In this way, the injection holes 170 of the first edge portion 110 and the second edge portion 120 can be injected simultaneously, which can effectively improve the injection efficiency.
[0067] like Figure 4 As shown, in one embodiment, the injection holes 170 at the first edge portion 110 and the injection holes 170 at the second edge portion 120 are symmetrically distributed about the protrusion 130. In this way, during the injection process, the electrolyte through the injection holes 170 at the first edge portion 110 and the electrolyte through the injection holes 170 at the second edge portion 120 can flow to the middle of the cell simultaneously, reducing the probability of uneven electrolyte flow.
[0068] Figure 5 A cross-sectional view of the top cover provided for an exemplary embodiment of this application. Figure 6 A cross-sectional view of the top cover provided for another exemplary embodiment of this application. (See also:) Figure 5 and Figure 6 As shown, the injection hole 170 includes a first hole section 171 and a second hole section 172. The first hole section 171 is connected to the second hole section 172, and the first hole section 171 is closer to the protrusion 130 relative to the second hole section 172.
[0069] It should be understood that during the electrolyte injection process, the electrolyte first passes through the second hole section 172, then through the first hole section 171, and then extends to different parts of the core.
[0070] In practical applications, at the start of injection, the electrolyte flow rate is relatively fast, and the injection hole 170 cannot quickly disperse the electrolyte. The resistance to the electrolyte passing through the injection hole 170 is significant, preventing smooth passage and resulting in low injection efficiency. Therefore, as... Figure 5 and Figure 6 As shown, the inner diameter of the second orifice 172 is larger than that of the first orifice 171. In this way, the larger inner diameter of the second orifice 172 can reduce the resistance to electrolyte entry, allowing the electrolyte to pass through the second orifice 172 and the first orifice 171 more smoothly, thereby effectively reducing the injection time and improving the injection efficiency.
[0071] Figure 7 A cross-sectional view of the top cover provided for another exemplary embodiment of this application. Figure 8 A cross-sectional view of the top cover provided for another exemplary embodiment of this application. (See also:) Figure 7 and Figure 8 As shown, the injection port 170 includes a first port 173 and a second port 174 opposite each other. The first port 173 is closer to the protrusion 130 than the second port 174. The inner diameter of the injection port 170 gradually increases from the first port 173 to the second port 174. In this way, the second port 174 can also reduce the resistance to electrolyte entry, allowing the electrolyte to pass through the injection port 170 more smoothly, thereby effectively reducing the injection time and improving the injection efficiency.
[0072] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0073] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0074] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.
[0075] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0076] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. A top cover having an injection hole (170) penetrating the top cover, characterized in that, The top cover includes: First edge portion (110); The second edge portion (120) is disposed opposite to the first edge portion (110) along the first direction; A protrusion (130) is provided between the first edge portion (110) and the second edge portion (120); The injection hole (170) is located on the first edge portion (110) and / or the second edge portion (120); or, the injection hole (170) is located between the first edge portion (110) and the second edge portion (120). The thickness of the portion between the protrusion (130) and the first edge portion (110) gradually decreases along the second direction to form a first guide slope (140); and / or the thickness of the portion between the protrusion (130) and the second edge portion (120) gradually decreases along the third direction to form a second guide slope (150).
2. The top cover according to claim 1, characterized in that, The top cover is also provided with a relief groove (160), which extends through the first guide slope (140) and the second guide slope (150) along the first direction, so that the opposite ends of the relief groove (160) extend to the first edge portion (110) and the second edge portion (120) respectively, and the injection hole (170) is located in the area of the relief groove (160).
3. The top cover according to claim 1, characterized in that, Both the first edge portion (110) and the second edge portion (120) are provided with the injection hole (170), and the injection hole (170) at the first edge portion (110) and the injection hole (170) at the second edge portion (120) are symmetrically distributed about the protrusion (130).
4. The top cover according to any one of claims 1 to 3, characterized in that, The injection hole (170) includes a first hole segment (171) and a second hole segment (172), the first hole segment (171) and the second hole segment (172) are connected, and the first hole segment (171) is closer to the protrusion (130) than the second hole segment (172); wherein, the inner diameter of the second hole segment (172) is larger than the inner diameter of the first hole segment (171).
5. The top cover according to any one of claims 1 to 3, characterized in that, The injection hole (170) includes a first port (173) and a second port (174) opposite each other, the first port (173) being closer to the protrusion (130) than the second port (174); wherein, in the direction from the first port (173) to the second port (174), the inner diameter of the injection hole (170) gradually increases.
6. The top cover according to any one of claims 1 to 3, characterized in that, The protrusion (130) is provided with a platform surface (131), and the opposite sides of the platform surface (131) are connected to the first guide slope (140) and the second guide slope (150) respectively; wherein, the platform surface (131) is distributed parallel to the fourth direction.
7. The top cover according to claim 6, characterized in that, The first guide ramp (140) and the second guide ramp (150) are symmetrically arranged about the platform surface (131).
8. The top cover according to any one of claims 1 to 3, characterized in that, The thickness of the protrusion (130) is X, the thickness of the first edge portion (110) is Y, and the thickness of the second edge portion (120) is Z. Wherein, X and Y satisfy: 0.5mm ≤ XY ≤ 1.5mm; The X and Z satisfy: 0.5mm ≤ XZ ≤ 1.5mm; The Y and Z satisfy: 1.5mm≤Y≤3mm, 1.5mm≤Z≤3mm.
9. The top cover according to any one of claims 1 to 3, characterized in that, The surfaces of the protrusion (130), the first guide slope (140), and the second guide slope (150) are provided with an insulating layer.
10. A single battery cell, characterized in that, include: case; The top cover as described in any one of claims 1 to 9 is disposed on the top of the housing, with the protrusion (130), the first guide slope (140), and the second guide slope (150) facing the housing.