Battery top cover and battery
By setting recesses and guide grooves on the insulating sheet, the problems of clogging of the injection hole and electrolyte impact are solved, thereby improving the safety and reliability of the battery injection process.
Patent Information
- Application Number
- CN202520027324.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-07
AI Technical Summary
In existing technologies, the electrolyte injection hole may be blocked by the cell tabs, causing direct impact damage to the cell assembly during electrolyte injection, and foreign objects can easily fall into the battery, affecting battery safety.
A recess and a flow channel are provided on the insulating sheet. The electrolyte enters the recess through the injection hole and flows into the battery through the flow channel, avoiding direct impact on the electrode and preventing foreign objects from falling in.
It protects the cell electrodes, improves battery safety and the reliability of the electrolyte injection process, prevents foreign objects from entering the battery, and enhances the overall safety of the battery.
Smart Images
Figure CN223843162U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of new energy battery technology, and in particular to a battery top cover and battery. Background Technology
[0002] As an essential component of new energy equipment, new energy batteries have become increasingly prevalent, finding widespread application in electric vehicles, home energy storage, portable batteries, and digital batteries. Electrolyte is a crucial component of new energy batteries; it must be injected during the manufacturing process to meet battery performance requirements. Currently, new energy batteries typically consist of at least a top cover, a cell, and a casing. The top cover has an injection port, through which electrolyte is injected under high pressure into the cell and casing. Since the cell tabs are located directly below the injection hole, the injection hole may be blocked by the cell tabs. Since the electrolyte needs to enter the cell and casing through the injection hole, blockage will affect normal electrolyte injection. Secondly, the electrolyte is pressurized during injection. The high-pressure injected electrolyte directly impacts the cell tabs and the insulating adhesive on their surface. Due to the significant impact force of the pressurized electrolyte, it can easily damage the cell tabs or cause the insulating adhesive on the surface of the cell tabs to detach or shift, ultimately leading to a short circuit in the cell. Additionally, there is the possibility of foreign objects (such as seals used to seal the injection hole) falling directly into the cell through the injection hole. Utility Model Content
[0003] The purpose of this invention is to provide a battery top cover and a battery to solve the problems in the prior art where the electrolyte injection hole may be blocked and the electrolyte may directly impact and damage the battery cell assembly during injection.
[0004] The technical solution of this utility model is as follows: Firstly, a battery top cover is provided, including a top cover sheet and an insulating sheet attached to the underside of the top cover sheet;
[0005] The top cover is provided with a liquid injection hole, and the insulating sheet is provided with a recess at the joint with the liquid injection hole; the insulating sheet is also provided with a drainage groove, which connects the recess with the edges on both sides of the insulating sheet in the width direction.
[0006] Preferably, the drainage groove includes a first sub-groove and a second sub-groove that are perpendicular to each other. The first sub-groove is arranged along the length direction of the insulating sheet, and the second sub-groove connects the edges on both sides of the insulating sheet in the width direction. The recessed portion is connected to the middle of the first sub-groove and the second sub-groove through the middle of the second sub-groove.
[0007] Preferably, the drainage groove further includes a third sub-groove and a fourth sub-groove that are perpendicular to each other. The third sub-groove is on the same straight line as the first sub-groove and does not overlap. The fourth sub-groove connects the edges on both sides of the insulating sheet in the width direction. The recessed portion is connected to the middle of the third sub-groove and the fourth sub-groove through the middle of the fourth sub-groove.
[0008] Preferably, the drainage groove is provided on the first surface of the insulating sheet, and the second surface of the insulating sheet is provided with a rib corresponding to the drainage groove.
[0009] Preferably, the height of the bottom wall of the recess is higher than the height of the bottom wall of the drainage channel.
[0010] Preferably, the top cover sheet and the insulating sheet are bonded and fixed together.
[0011] Preferably, the top cover is provided with an explosion-proof valve, and the insulating sheet is provided with a mesh-like perforated structure, the position of which is opposite to the position of the explosion-proof valve.
[0012] Preferably, it further includes a positive terminal and a negative terminal, the top cover plate is provided with a first positive terminal hole and a first negative terminal hole, and the insulating sheet is provided with a second positive terminal hole and a second negative terminal hole; the positive terminal passes through the first positive terminal hole and the second positive terminal hole, and the negative terminal passes through the first negative terminal hole and the second negative terminal hole.
[0013] Preferably, the top cover plate is further provided with a first positive electrode plastic that cooperates with the positive electrode post and a first negative electrode plastic that cooperates with the negative electrode post, a second positive electrode plastic is provided between the first positive electrode post hole and the second positive electrode post hole, and a second negative electrode plastic is provided between the first negative electrode post hole and the second negative electrode post hole.
[0014] In a second aspect, a battery is provided, which includes the battery top cover described in any of the preceding claims.
[0015] The beneficial effects of this invention are as follows: By providing recesses and guide grooves on the insulating sheet, the electrolyte can fall from the injection hole into the recesses during injection. The electrolyte entering the recesses then flows along the guide grooves to the edge of the insulating sheet on one side of its width and subsequently into the battery. During this injection process, the electrolyte does not directly impact the electrodes, providing a certain degree of protection. After injection, it also prevents foreign objects from falling into the battery through the injection hole, improving battery safety. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the battery top cover according to an embodiment of the present utility model.
[0017] Figure 2This is a schematic diagram of the structure of the second surface of the insulating sheet of the battery top cover according to an embodiment of the present invention.
[0018] Reference numerals: 10-Top cover plate; 11-Injection hole; 20-Insulating sheet; 21-Recessed part; 22-Guide groove; 221-First sub-groove; 222-Second sub-groove; 223-Third sub-groove; 224-Fourth sub-groove; 30-Rib; 40-Explosion-proof valve; 41-Explosion-proof sticker; 50-Mesh hollow structure; 61-Positive electrode post; 62-Negative electrode post; 71-First positive electrode post hole; 72-First negative electrode post hole; 73-Second positive electrode post hole; 74-Second negative electrode post hole; 81-First positive electrode plastic; 82-First negative electrode plastic; 83-Second positive electrode plastic; 84-Second negative electrode plastic. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0021] Figure 1 This is a schematic diagram of the battery top cover according to an embodiment of the present invention. It should be noted that if substantially the same result is achieved, the embodiment of the present invention is not necessarily identical. Figure 1 The structures shown are limited. For example... Figure 1 As shown, the battery top cover includes a top cover sheet 10 and an insulating sheet 20 attached below the top cover sheet 10;
[0022] The top cover plate 10 is provided with a liquid injection hole 11, and the insulating sheet 20 is provided with a recessed portion 21 at the contact point with the liquid injection hole 11; the insulating sheet 20 is also provided with a drainage groove, which connects the recessed portion 21 with the edges on both sides of the insulating sheet 20 in the width direction.
[0023] In this embodiment, by providing a recess 21 and a flow channel 22 on the insulating sheet 20, the electrolyte can fall from the injection hole 11 into the recess 21 during electrolyte injection. The electrolyte entering the recess 21 flows along the flow channel 22 to the edge of the insulating sheet 20 in the width direction and then flows into the battery. During the electrolyte injection process, the electrolyte does not directly impact the electrode, thus providing some protection to the electrode. After the electrolyte injection is completed, it also prevents foreign objects from falling into the battery through the injection hole 11, improving battery safety. If a metal seal is needed to seal the injection hole 11 after the electrolyte injection is completed, since the recess 21 is below the injection hole 11, the seal will not fall into the battery through the injection hole 11, greatly improving battery safety.
[0024] In some embodiments, such as Figure 1 As shown, the drainage groove includes a first sub-groove 221 and a second sub-groove 222 that are perpendicular to each other. The first sub-groove 221 is arranged along the length direction of the insulating sheet 20, and the second sub-groove 222 connects the edges on both sides of the insulating sheet 20 in the width direction. The recessed portion 21 is connected to the middle part of the second sub-groove 222 through the first sub-groove 221.
[0025] In this embodiment, the first sub-groove 221 is arranged along the length direction of the insulating sheet 20, and the second sub-groove 222 connects the edges on both sides of the width direction of the insulating sheet 20. The length of the first sub-groove 221 can be flexibly set as needed, so that the electrolyte can be guided to any point on the edge of the insulating sheet 20 along its length direction.
[0026] In some embodiments, such as Figure 1 As shown, the drainage groove also includes a third sub-groove 223 and a fourth sub-groove 224 that are perpendicular to each other. The third sub-groove 223 is on the same straight line as the first sub-groove 221 and does not overlap. The fourth sub-groove 224 connects the edges of both sides of the insulating sheet 20 in the width direction. The recessed portion 21 is connected to the middle of the third sub-groove 223 and the fourth sub-groove 224.
[0027] In this embodiment, the third sub-slot 223 and the first sub-slot 221 are on the same straight line, and the electrolyte at the recess 21 can be guided along both the third sub-slot 223 and the first sub-slot 221 simultaneously, thereby improving the electrolyte diversion efficiency. The fourth sub-slot 224 also increases the number of points where electrolyte flows into the battery, improving the uniformity of electrolyte injection.
[0028] In some embodiments, Figure 2 This is a schematic diagram of the structure of the second surface of the insulating sheet of the battery top cover according to an embodiment of the present invention, as shown below. Figure 2As shown, the drainage groove is provided on the first surface of the insulating sheet 20, and the second surface of the insulating sheet 20 is provided with a rib 30 corresponding to the drainage groove.
[0029] In this embodiment, by providing a raised rib 30 corresponding to the drainage groove on the second surface of the insulating sheet 20, the overall structural strength of the drainage groove and even the insulating sheet 20 can be improved, and the service life can be increased.
[0030] In some embodiments, the height of the bottom wall of the recess 21 is higher than the height of the bottom wall of the drainage channel.
[0031] In this embodiment, the height of the bottom wall of the recess 21 is higher than the height of the bottom wall of the drainage channel. This allows the electrolyte, after being injected into the recess 21, to flow from the recess 21 to the drainage channel under gravity, improving the efficiency of electrolyte injection. It also ensures that no electrolyte residue remains in the recess 21, enhancing battery safety.
[0032] In some embodiments, the top cover 10 and the insulating sheet 20 are bonded and fixed together.
[0033] In this embodiment, the top cover sheet 10 and the insulating sheet 20 are bonded and fixed to enhance the connection stability between the top cover sheet 10 and the insulating sheet 20, and prevent the insulating sheet 20 and the top cover sheet 10 from separating due to impact during the high-pressure electrolyte injection process of the battery.
[0034] In some embodiments, such as Figure 1 As shown, the top cover plate 10 is provided with an explosion-proof valve 40, and the insulating sheet 20 is provided with a mesh hollow structure 50. The position of the mesh hollow structure 50 is opposite to the position of the explosion-proof valve 40.
[0035] In this embodiment, the top cover 10 is equipped with an explosion-proof valve 40. When the internal pressure or temperature of the battery is too high, the valve automatically opens to directly dissipate the high-pressure gas inside, thereby achieving the purpose of explosion prevention. The explosion-proof valve 40 is also equipped with an explosion-proof patch that works in conjunction with it. The insulating sheet 20 is equipped with a mesh-like hollow structure 50. The position of the mesh-like hollow structure 50 is opposite to the position of the explosion-proof valve 40. On the one hand, the mesh-like hollow structure 50 is designed for the operation and opening of the explosion-proof valve 40. On the other hand, the mesh-like hollow structure 50 can reduce the internal stress of the insulating sheet 20 and improve the structural strength during the liquid injection process.
[0036] In one specific embodiment, the guide groove 22 is manufactured on the surface of the insulating sheet 20 by a stamping process. The processing technology is simple, easy to mass-produce, and helps to reduce production costs.
[0037] In some embodiments, such as Figure 1As shown, it also includes a positive terminal 61 and a negative terminal 62. The top cover plate 10 is provided with a first positive terminal hole 71 and a first negative terminal hole 72, and the insulating sheet 20 is provided with a second positive terminal hole 73 and a second negative terminal hole 74. The positive terminal 61 passes through the first positive terminal hole 71 and the second positive terminal hole 73, and the negative terminal 62 passes through the first negative terminal hole 72 and the second negative terminal hole 74.
[0038] In this embodiment, the positive terminal 61 passes through the first positive terminal hole 71 and the second positive terminal hole 73 to connect with the top cover plate 10 and the insulating plate 20; the terminal passes through the first negative terminal hole 72 and the second negative terminal hole 74 to connect with the top cover plate 10 and the insulating plate 20.
[0039] In some embodiments, such as Figure 1 As shown, the top cover plate 10 is also provided with a first positive electrode plastic 81 that cooperates with the positive electrode post 61 and a first negative electrode plastic 82 that cooperates with the negative electrode post 62. A second positive electrode plastic 83 is provided between the first positive electrode post hole 71 and the second positive electrode post hole 73, and a second negative electrode plastic 84 is provided between the first negative electrode post hole 72 and the second negative electrode post hole 74.
[0040] In this embodiment, the first positive electrode plastic 81 and the second positive electrode plastic 83 cooperate to seal the connection between the positive electrode post 61 and the top cover plate 10 and the insulating plate 20. The first negative electrode plastic 82 and the second negative electrode plastic 84 cooperate to seal the connection between the negative electrode post 62 and the top cover plate 10 and the insulating plate 20.
[0041] In some embodiments, a battery is provided that includes the battery top cover described in any of the above embodiments.
[0042] The beneficial effects of this invention are as follows: By providing a recess 21 and a flow guide groove 22 on the insulating sheet 20, the electrolyte can fall from the injection hole 11 into the recess 21 during electrolyte injection. The electrolyte entering the recess 21 flows along the flow guide groove 22 to the edge of the insulating sheet 20 in the width direction and then flows into the battery. During the electrolyte injection process, the electrolyte will not directly impact the electrode, thus providing a certain degree of protection for the electrode. After the electrolyte injection is completed, it also prevents foreign objects from falling into the battery through the injection hole 11, improving battery safety.
[0043] The above description is merely an embodiment of the present utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present utility model, but these improvements all fall within the protection scope of the present utility model.
Claims
1. A battery top cover, characterized in that, Includes a top cover sheet and an insulating sheet attached below the top cover sheet; The top cover is provided with a liquid injection hole, and the insulating sheet is provided with a recess at the joint with the liquid injection hole; the insulating sheet is also provided with a drainage groove, which connects the recess with the edges on both sides of the insulating sheet in the width direction.
2. The battery top cover according to claim 1, characterized in that, The drainage groove includes a first sub-groove and a second sub-groove that are perpendicular to each other. The first sub-groove is arranged along the length direction of the insulating sheet, and the second sub-groove connects the edges on both sides of the insulating sheet in the width direction. The recessed portion is connected to the middle of the first sub-groove and the second sub-groove through the middle of the second sub-groove.
3. The battery top cover according to claim 2, characterized in that, The drainage groove also includes a third sub-groove and a fourth sub-groove that are perpendicular to each other. The third sub-groove is on the same straight line as the first sub-groove and does not overlap. The fourth sub-groove connects the edges on both sides of the insulating sheet in the width direction. The recessed portion is connected to the middle of the third sub-groove and the fourth sub-groove through the middle of the fourth sub-groove.
4. The battery top cover according to claim 1, characterized in that, The drainage groove is provided on the first surface of the insulating sheet, and the second surface of the insulating sheet is provided with a rib corresponding to the drainage groove.
5. The battery top cover according to claim 1, characterized in that, The height of the bottom wall of the recess is higher than the height of the bottom wall of the drainage channel.
6. The battery top cover according to claim 1, characterized in that, The top cover and the insulating sheet are bonded and fixed together.
7. The battery top cover according to claim 1, characterized in that, The top cover is equipped with an explosion-proof valve, and the insulating sheet is equipped with a mesh-like perforated structure. The position of the mesh-like perforated structure is opposite to the position of the explosion-proof valve.
8. The battery top cover according to claim 1, characterized in that, It also includes a positive terminal and a negative terminal. The top cover plate is provided with a first positive terminal hole and a first negative terminal hole, and the insulating sheet is provided with a second positive terminal hole and a second negative terminal hole. The positive terminal passes through the first positive terminal hole and the second positive terminal hole, and the negative terminal passes through the first negative terminal hole and the second negative terminal hole.
9. The battery top cover according to claim 8, characterized in that, The top cover plate is also provided with a first positive electrode plastic that cooperates with the positive electrode post and a first negative electrode plastic that cooperates with the negative electrode post. A second positive electrode plastic is provided between the first positive electrode post hole and the second positive electrode post hole, and a second negative electrode plastic is provided between the first negative electrode post hole and the second negative electrode post hole.
10. A battery, characterized in that, The battery top cover includes any one of claims 1-9.