Cover plate insulation lower plastic cement structure
By riveting, the inverted T-shaped positioning platform is engaged with the positioning through-hole, which solves the problems of low plastic connection strength and large gap under the lithium battery cover, achieves high-strength connection and small gap, reduces the risk of cold welding and leakage, and improves the process yield.
Patent Information
- Application Number
- CN202422403470.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The traditional plastic connection method under the lithium battery cover is prone to low strength and large gaps, leading to problems such as cold solder joints and leakage, and low process yield.
The inverted T-shaped positioning platform on the back of the aluminum plate is riveted to engage with the positioning through-holes of the lower plastic. The elastic restoring force of the elastic material is used to make the lower plastic fit tightly to the aluminum plate, ensuring high strength and small gaps at each point.
The connection strength between the cover plate and the connecting piece is improved, the problems of cold solder joints and leakage are reduced, and the process yield is improved.
Smart Images
Figure CN223414245U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, in particular to a plastic structure under an insulating cover. Background Art
[0002] With the popularity of electric vehicles and portable electronic devices, the application of lithium batteries is becoming more and more widespread. One of the important components of lithium batteries is the cover plate, which protects the internal components of the lithium battery while withstanding external pressure. Traditionally, the lower plastic of the cover plate is generally connected to the aluminum plate through a pole snap-fit or ultrasonic hot melt method. However, the pole snap-fit method can easily lead to lower strength in the middle of the lower plastic. During the manufacturing process, the battery cell can pull on the lower plastic, which can easily cause the lower plastic to deform and cause abnormalities such as film explosion. Although the ultrasonic hot melt method has better strength at each point, it can easily lead to a larger gap between the lower plastic and the aluminum plate. It requires higher precision in the fit between the connecting piece and the cover plate, which can easily cause the cover plate and the connecting piece to be poorly welded. In addition, if the ultrasonic hot melt point is close to the explosion-proof valve, it can easily shatter the explosion-proof valve weld, causing leakage. Utility Model Content
[0003] The purpose of the present invention is to address the deficiencies in the above-mentioned background technology and provide an improved cover plate insulating lower plastic structure, which can fix the lower plastic by riveting, so that the strength of each point of the lower plastic is higher, and the gap between the lower plastic and the aluminum plate is reduced, thereby improving the process yield and reducing problems such as cold welding between the cover plate and the connecting piece.
[0004] In order to achieve the above-mentioned purpose, the utility model provides a cover plate insulation lower plastic structure, comprising an aluminum plate and a lower plastic, wherein the two ends of the aluminum plate are provided with pole through holes, the middle of the aluminum plate is provided with an explosion-proof valve through hole, and the aluminum plate is provided with a liquid injection hole between the pole through hole and the explosion-proof valve through hole. The lower plastic has the same contour shape as the aluminum plate, and the corresponding position of the lower plastic is also provided with the pole through hole and the liquid injection hole, characterized in that:
[0005] The back of the aluminum plate is provided with a plurality of positioning platforms, and the lower plastic is provided with a plurality of positioning through holes corresponding to the positioning platforms. The shape of the positioning platforms is set to be an inverted T-shape, the outer diameter of the lower part of the positioning platforms is larger than the outer diameter of the upper part, the outer diameter of the lower part of the positioning platforms is larger than the aperture of the positioning through holes, and the outer diameter of the upper part of the positioning platforms is smaller than the aperture of the positioning through holes;
[0006] The positioning platform is made of elastic material.
[0007] Furthermore, the height of the upper portion of the positioning platform matches the thickness of the positioning through hole, so that after the positioning platform is installed in place, the upper portion of the positioning platform is in a stretched state.
[0008] Furthermore, the lower portion of the positioning platform is configured to be conical.
[0009] Furthermore, the positioning platform of the aluminum plate and the positioning through holes of the lower plastic are both provided with eight holes and distributed in two rows.
[0010] Furthermore, the positioning platform is kept at the same height, and the positioning through holes are also kept at the same height.
[0011] Furthermore, the elastic material is rubber.
[0012] The above solution of the utility model has the following beneficial effects:
[0013] The insulating lower plastic structure of the cover provided by the utility model can engage the positioning platform with the positioning through-hole through riveting through the positioning platform on the back of the aluminum plate and the positioning through-hole of the lower plastic, thereby making the lower plastic fit and firmly connected to the aluminum plate. At the same time, the connection strength of each point of the lower plastic is high, ensuring that the gap between the lower plastic and the aluminum plate is extremely small, improving the process quality rate, and reducing problems such as false welding between the cover plate and the connecting piece and leakage of the explosion-proof valve weld.
[0014] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is an exploded schematic diagram of the overall structure of the utility model;
[0016] Figure 2 This is another exploded schematic diagram of the overall structure of the utility model;
[0017] Figure 3 This is a schematic diagram of the installation of the positioning platform and positioning through holes of the present invention.
[0018] [Description of Reference Numerals]
[0019] 1-aluminum plate; 2-lower plastic; 3-pole through hole; 4-explosion-proof valve through hole; 5-liquid injection hole; 6-liquid drainage hole; 7-positioning platform; 8-positioning through hole. DETAILED DESCRIPTION
[0020] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a locking connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0023] like Figure 1 、 Figure 2 As shown, an embodiment of the present invention provides a cover plate insulating lower plastic structure, comprising an aluminum plate 1 and a lower plastic 2. Pole through holes 3 are provided at both ends of the aluminum plate 1, an explosion-proof valve through hole 4 is provided in the middle of the aluminum plate 1, and an injection hole 5 is provided between the pole through hole 3 and the explosion-proof valve through hole 4. The pole through hole 3 is used for the subsequent installation of positive and negative poles, sealing rings and injection molded parts, the explosion-proof valve through hole 4 is used for welding the explosion-proof valve, and the injection hole 5 is used for injection. The lower plastic 2 is made of PP, PET, PE and other materials, and has the same contour shape as the aluminum plate 1. The diagonal corners of the rectangle are rounded, and a 3-5mm high downward boss is provided at both ends. A drainage hole 6 is provided on the boss for discharging the electrolyte remaining between the aluminum plate 1 and the lower plastic 2. The corresponding position of the lower plastic 2 is also provided with a pole through hole, an injection hole, etc.
[0024] At the same time Figure 3 As shown, the back of the aluminum plate 1 is provided with multiple positioning platforms 7 for positioning the lower plastic 2. The lower plastic 2 is provided with multiple positioning through holes 8 corresponding to the positioning platforms 7, which are subsequently inserted into the multiple positioning platforms 7 on the back of the aluminum plate 1, so that the lower plastic 2 and the aluminum plate 1 form a primary positioning.
[0025] The positioning platform 7 may be in a cylindrical, rectangular, or other shape. As a preferred embodiment, the positioning platform 7 in this embodiment is in an inverted T-shape, i.e., the outer diameter of the lower portion of the positioning platform 7 is larger than the outer diameter of the upper portion. Furthermore, the outer diameter of the lower portion of the positioning platform 7 is slightly larger than the aperture of the positioning through hole 8, while the outer diameter of the upper portion of the positioning platform 7 is smaller than the aperture of the positioning through hole 8.
[0026] The positioning platform 7 is also made of an elastic material, such as rubber. Therefore, during installation, the positioning platform 7 can be aligned with the positioning hole 8 first, and then the aluminum plate 1 and the lower plastic 2 can be pressed against each other, causing the lower portion of the positioning platform 7 to deform or bend, allowing it to enter the positioning hole 8 and exit from the back of the lower plastic 2. After elastic recovery, a snap-fit state is formed, forming a tight connection between the lower plastic 2 and the aluminum plate 1. It should be noted that the height of the upper portion of the positioning platform 7 is preferably slightly less than the thickness of the positioning hole 8, so that after the positioning platform 7 is in place, the upper portion of the positioning platform 7 is in a certain state of tension, relying on the elastic force to maintain a tight fit between the aluminum plate 1 and the lower plastic 2.
[0027] It should be noted that to avoid difficulty inserting the positioning platform 7 into the positioning hole 8, the outer diameter of the lower portion of the positioning platform 7 cannot be significantly larger than the diameter of the positioning hole 8. As an optional embodiment, the lower portion of the positioning platform 7 is tapered to further ensure quick and smooth insertion into the positioning hole 8. Of course, the lower portion of the positioning platform 7 can also be configured to have an interference fit with the positioning hole 8, so that after installation, the lower portion of the positioning platform 7 is located in the positioning hole 8 and is fixed.
[0028] As a preferred embodiment, in this embodiment, the positioning platform 7 on the back of the aluminum plate 1 and the positioning through holes 8 on the lower plastic 2 are both provided with eight and arranged in two rows, close to the diagonal position and the position of the explosion-proof valve through hole 4, so that after installation, it can be ensured that multiple positions of the lower plastic 2 are all engaged to prevent it from being locally deformed due to the pulling of the battery cell, which can effectively reduce the welding rate of the production line. Of course, in other embodiments, more arrangements in number and position can be used, and the above is not intended to limit this. In short, in this embodiment, the positioning platform 7 made of elastic material and the positioning through holes 8 are fixed in a manner that can effectively reduce the gap between the lower plastic 2 and the aluminum plate 1, so that the gap is less than 0.2 mm, solving the problem of cold welding between the cover plate and the connecting piece due to excessive gap.
[0029] It should be noted that the thickness of the lower plastic 2 of the lithium battery cover is generally 0.8-1.5mm, with an overall height of 3.5-8mm. The thickness of the aluminum plate 1 is generally 1.0-3.0mm. Since the aluminum plate 1 and the positioning platform 7 are set at the same height, the positioning holes 8 of the lower plastic 2 must also be set at the same height to ensure a tight fit between the aluminum plate 1 and the lower plastic 2 after installation.
[0030] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0031] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.
Claims
1. A cover plate insulating lower plastic structure, comprising an aluminum plate and a lower plastic, wherein the aluminum plate is provided with a pole through-hole at both ends, an explosion-proof valve through-hole is provided in the middle of the aluminum plate, and an injection hole is provided between the pole through-hole and the explosion-proof valve through-hole. The lower plastic has the same contour shape as the aluminum plate, and the pole through-hole and the injection hole are also provided at corresponding positions of the lower plastic, characterized in that: The back of the aluminum plate is provided with a plurality of positioning platforms, and the lower plastic is provided with a plurality of positioning through holes corresponding to the positioning platforms. The shape of the positioning platforms is set to be an inverted T-shape, the outer diameter of the lower part of the positioning platforms is larger than the outer diameter of the upper part, the outer diameter of the lower part of the positioning platforms is larger than the aperture of the positioning through holes, and the outer diameter of the upper part of the positioning platforms is smaller than the aperture of the positioning through holes; The positioning platform is made of elastic material.
2. The plastic structure under the cover insulation according to claim 1, characterized in that: The height of the upper portion of the positioning platform matches the thickness of the positioning through hole, so that after the positioning platform is installed in place, the upper portion of the positioning platform is in a stretched state.
3. The plastic structure under the cover insulation according to claim 1, characterized in that: The lower portion of the positioning platform is configured to be conical.
4. The plastic structure under the cover insulation according to claim 1, characterized in that: The positioning platform of the aluminum plate and the positioning through holes of the lower plastic are both provided with eight holes and distributed in two rows.
5. The plastic structure under the cover insulation according to claim 4, characterized in that: The positioning platform is kept at the same height, and the positioning through holes are also kept at the same height.
6. The plastic structure under the cover insulation according to claim 1, characterized in that: The elastic material is rubber.