Battery cover plate, battery and electric equipment
By setting sealing steps and sealing rings on the battery cover, the problem of poor sealing of the battery liquid injection hole is solved, and a more reliable sealing effect is achieved, reducing production costs and improving the safety of the battery use.
Patent Information
- Application Number
- CN202420938221.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing battery injection hole sealing method has poor sealing properties, resulting in leakage of electrolyte, increasing production costs and waste of resources, and the sealant plug is prone to failure when the internal pressure of the battery changes.
Adopt the battery cover design, sealing steps are set inside the liquid injection hole, sealing nails are fixed to the top wall of the step, sealing rings are clamped, sealing glue nails are cancelled, and sealing rings are clamped between the sealing nails and the step to achieve more reliable seal.
It improves the seal reliability of the injection hole, prevents the leakage of electrolyte, reduces production costs, and is not affected by the internal air pressure of the battery, and enhances the safety and reliability of the battery.
Smart Images
Figure CN222282128U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery cover, a battery and an electrical device. Background Art
[0002] The existing power battery injection hole is a hole opened on the cover plate. After the cover plate and the battery shell are welded, the liquid is injected into the battery through the injection hole. After the injection is completed, the injection hole is sealed to prevent leakage of the electrolyte. In the prior art, the injection hole is mostly sealed by laser welding. However, when the electrolyte is injected, there will be electrolyte residue around the injection hole, which is easy to affect the sealing of the laser welding. Due to the poor welding sealing, the battery electrolyte leaks and the battery is scrapped, which increases the production cost, wastes resources, and is not conducive to environmental protection. There is also a method of sealing the injection through hole with a sealing plug. However, in actual use, after the internal pressure of the battery cell changes, the internal pressure of the battery will squeeze the plug out of the effective sealing area, causing the seal to fail.
[0003] Therefore, there is an urgent need to provide a new type of battery cover, battery and electrical equipment to solve the above-mentioned technical problems in the prior art. Utility Model Content
[0004] The utility model aims to provide a battery cover plate, which can make the sealing effect of the liquid injection hole better, is not easy to fail, and improves the sealing reliability of the liquid injection hole.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The battery cover includes a cover body, a sealing pin and a sealing ring. The cover body is provided with a liquid injection hole. A sealing step is convexly provided on the inner circumferential wall surface of the liquid injection hole so that the liquid injection hole is divided into an upper half hole and a lower half hole. The inner diameter of the upper half hole is larger than the inner diameter of the lower half hole. The sealing pin is fixedly connected to the upper half hole, and at least part of the bottom wall of the sealing pin abuts against the top wall of the sealing step. The sealing ring is clamped between the bottom wall of the sealing pin and the top wall of the sealing step.
[0007] Optionally, the inner diameter of the top of the upper half hole is larger than the inner diameter of the bottom of the upper half hole, the outer diameter of the top of the sealing pin is larger than the outer diameter of the bottom of the sealing pin, and the circumferential outer wall of the sealing pin abuts against the circumferential inner wall of the upper half hole.
[0008] Optionally, the sealing pin is connected to the top port of the upper half hole by welding.
[0009] Optionally, the top wall of the sealing step is provided with an annular groove, and the sealing ring is cooperatively arranged in the annular groove.
[0010] Optionally, the sealing ring is an elastic member.
[0011] Optionally, the sealing ring is interference connected with the annular groove.
[0012] Optionally, the top wall of the sealing nail is not higher than the top wall of the cover body.
[0013] Optionally, an insulating member is attached to the bottom wall of the cover body.
[0014] Another object of the present invention is to provide a battery, which includes the battery cover as described in any of the above solutions.
[0015] Another object of the present invention is to provide an electrical device, which comprises the battery described in the above solution.
[0016] Beneficial effects:
[0017] The battery cover of the utility model has a sealing step formed on the circumferential wall surface inside the injection hole, so that the injection hole is divided into an upper half hole and a lower half hole. A sealing nail is fixed in the upper half hole, and a sealing ring is sandwiched between the sealing nail and the sealing step to achieve the sealing of the injection hole. The sealing structure of the injection hole of the battery cover eliminates the setting of the sealing nail, and uses a sealing ring sandwiched between the sealing nail and the sealing step of the injection hole to achieve the sealing of the injection hole by the sealing nail. The sealing structure is not affected by the internal air pressure of the battery, and even if the internal air pressure of the battery increases, it does not affect the sealing performance, making the sealing performance of the injection hole more reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a sealing structure of a liquid injection hole in the prior art;
[0019] Figure 2 It is an axonometric view of a battery cover provided by a specific embodiment of the utility model;
[0020] Figure 3 It is a longitudinal cross-sectional schematic diagram of a battery cover provided by a specific embodiment of the utility model;
[0021] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.
[0022] In the figure:
[0023] 100, cover plate body; 101, sealing nail; 110, injection hole; 111, upper half hole; 112, lower half hole; 120, sealing step; 121, annular groove;
[0024] 200, sealing nail; 300, sealing ring; 400, insulating part. DETAILED DESCRIPTION
[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0029] like Figure 1 As shown, the sealing structure of the injection hole 110 of the battery cover in the prior art is mainly achieved by inserting a sealing nail 101 in the injection hole 110, and then welding the sealing nail 200 to the injection hole 110. When the internal pressure of the battery increases, the high air pressure will push out the sealing nail 101, causing the sealing structure to fail and affecting the reliability of the battery.
[0030] To solve the above problems, please refer to Figures 2 to 4In this specific embodiment, the battery cover includes a cover body 100, a sealing nail 200 and a sealing ring 300. The cover body 100 is provided with a liquid injection hole 110, and a sealing step 120 is convexly provided on the inner circumferential wall surface of the liquid injection hole 110, so that the liquid injection hole 110 is divided into an upper half hole 111 and a lower half hole 112, and the inner diameter of the upper half hole 111 is larger than the inner diameter of the lower half hole 112; the sealing nail 200 is fixedly connected to the upper half hole 111, and at least part of the bottom wall of the sealing nail 200 abuts against the top wall of the sealing step 120; the sealing ring 300 is sandwiched between the bottom wall of the sealing nail 200 and the top wall of the sealing step 120.
[0031] In the battery cover of this specific embodiment, a sealing step 120 is formed on the circumferential wall surface inside the injection hole 110, so that the injection hole 110 is divided into an upper half hole 111 and a lower half hole 112. A sealing nail 200 is fixed in the upper half hole 111, and a sealing ring 300 is sandwiched between the sealing nail 200 and the sealing step 120 to achieve the sealing of the injection hole 110. The sealing structure of the injection hole 110 of the battery cover eliminates the setting of the sealing nail 101, and uses a sealing ring 300 sandwiched between the sealing nail 200 and the sealing step 120 of the injection hole 110 to achieve the sealing of the injection hole 110 by the sealing nail 200. The sealing structure is not affected by the internal air pressure of the battery, and even if the internal air pressure of the battery increases, it does not affect the sealing performance, making the sealing performance of the injection hole 110 more reliable.
[0032] like Figure 2 and Figure 3 As shown, the bottom wall of the cover body 100 is provided with an insulating member 400. The insulating member 400 is specifically a lower plastic, which can achieve an insulating connection between the battery cover and the battery core pack, thereby improving the safety of the battery.
[0033] Please continue to refer to Figure 4 Furthermore, the inner diameter of the top of the upper half hole 111 is greater than the inner diameter of the bottom of the upper half hole 111, the outer diameter of the top of the sealing pin 200 is greater than the outer diameter of the bottom of the sealing pin 200, and the circumferential outer wall of the sealing pin 200 abuts against the circumferential inner wall of the upper half hole 111. The circumferential wall surface of the sealing pin 200 configured in this way can better abut against the inner wall of the upper half hole 111, so that a contact surface is formed between the sealing pin 200 and the hole wall of the upper half hole 111, and a seal is formed on the contact surface, thereby improving the sealing performance between the sealing pin 200 and the upper half hole 111 of the injection hole 110.
[0034] Optionally, the sealing pin 200 is welded to the top end of the upper half hole 111. It is conceivable that the sealing pin 200 and the cover plate body 100 are both made of aluminum or aluminum alloy, and the circumferential edge of the top of the sealing pin 200 is connected to the end of the upper half hole 111 by laser welding, which is more stable and reliable, and prevents the sealing pin 200 from falling off.
[0035] In this specific embodiment, the top wall of the sealing step 120 is concavely provided with an annular groove 121, and the sealing ring 300 is cooperatively arranged in the annular groove 121. The annular groove 121 can limit the sealing ring 300, prevent the position of the sealing ring 300 from changing and thus affecting the sealing performance, and can also increase the contact area between the sealing ring 300 and the sealing step 120, further improving the sealing performance.
[0036] As a preferred embodiment, the sealing ring 300 is an elastic member. Specifically, the sealing ring 300 is made of elastic materials such as rubber and silicone, which can improve the sealing performance of the sealing ring 300 on the gap between the sealing pin 200 and the sealing step 120.
[0037] It is conceivable that the sealing ring 300 is interference-connected with the annular groove 121. The interference connection enables the sealing ring 300 to contact the inner wall of the annular groove 121 as much as possible, ensuring that the sealing ring 300 is completely attached to the annular groove 121, thereby improving the sealing effect of the sealing ring 300.
[0038] In this embodiment, the top wall of the sealing nail 200 is not higher than the top wall of the cover body 100. Such a setting can prevent the sealing nail 200 from exceeding the top wall of the cover body 100, reduce the volume of the battery cover, and do not need to avoid the sealing nail 200.
[0039] On the other hand, this specific embodiment also provides a battery, which includes a battery cover as described in any of the above schemes. The battery uses the battery cover of the above scheme, which can make the sealing effect of the injection hole 110 better, and when the internal pressure of the battery increases, the sealing performance of the injection hole 110 can still be guaranteed to prevent electrolyte leakage, thereby improving the safety and reliability of the battery.
[0040] This specific embodiment further provides an electric device, which includes the battery as described in the above scheme. The electric device can be an electric car, an electric bicycle, an energy storage device, a ship or other equipment, and only needs to be powered by a battery, and no specific restrictions are made here. The electric device includes all the beneficial effects of the battery described in the above scheme, which will not be repeated here one by one.
[0041] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A battery cover, characterized in that: include: A cover plate body (100), the cover plate body (100) being provided with a liquid injection hole (110), a sealing step (120) being convexly provided on the inner circumferential wall surface of the liquid injection hole (110), so that the liquid injection hole (110) is divided into an upper half hole (111) and a lower half hole (112), and the inner diameter of the upper half hole (111) is larger than the inner diameter of the lower half hole (112); A sealing pin (200), wherein the sealing pin (200) is fixed to the upper half hole (111), and at least a portion of the bottom wall of the sealing pin (200) abuts against the top wall of the sealing step (120); A sealing ring (300) is sandwiched between the bottom wall of the sealing pin (200) and the top wall of the sealing step (120).
2. The battery cover according to claim 1, characterized in that: The inner diameter of the top end of the upper hole (111) is greater than the inner diameter of the bottom end of the upper hole (111), the outer diameter of the top end of the sealing pin (200) is greater than the outer diameter of the bottom end of the sealing pin (200), and the circumferential outer wall of the sealing pin (200) abuts against the circumferential inner wall of the upper hole (111).
3. The battery cover according to claim 2, characterized in that: The sealing pin (200) is welded to the top end of the upper half hole (111).
4. The battery cover according to claim 1, characterized in that: The top wall of the sealing step (120) is provided with an annular groove (121), and the sealing ring (300) is arranged in the annular groove (121).
5. The battery cover according to claim 4, characterized in that: The sealing ring (300) is an elastic member.
6. The battery cover according to claim 5, characterized in that: The sealing ring (300) is interference-connected with the annular groove (121).
7. The battery cover according to any one of claims 1 to 6, characterized in that: The top wall of the sealing nail (200) is not higher than the top wall of the cover plate body (100).
8. The battery cover according to any one of claims 1 to 6, characterized in that: An insulating member (400) is attached to the bottom wall of the cover plate body (100).
9. A battery, characterized in that The invention comprises a battery cover as claimed in any one of claims 1 to 8.
10. Electrical equipment, characterized in that: Comprising the battery as claimed in claim 9.