A plastic-free battery cover plate

Abstract

The application provides a plastic-free battery cover plate, and belongs to the technical field of battery cover plates. The battery cover plate comprises a cover plate body, two pole columns, two connecting blocks, an upper insulating piece and a lower insulating piece. The upper insulating piece and the lower insulating piece are both inorganic non-metal materials. The plastic-free battery cover plate is made of inorganic non-metal materials and metal materials, effectively improving the high-temperature resistance and long-term reliability of the battery cover plate, facilitating recycling, and effectively improving the yield and reliability of the product by welding the pole columns and the upper insulating piece, the upper insulating piece and the connecting piece, and then welding the connecting piece and the cover plate body, so that the pole columns and the cover plate body are sealed and stably connected together. The connecting piece covers a local groove and is reserved with a certain gap with the hole wall of the large-diameter area of the mounting hole. After welding, a sealing connection area three is formed, which integrally seals and connects the connecting piece, the mounting hole step surface and the hole wall, further effectively improving the sealing performance of the overall structure and the stability of the connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cover plates, in particular to a battery cover plate without plastic. BACKGROUND

[0002] As a key safety component, battery cover plates need to have insulation, sealing and pressure relief functions. Currently, the mainstream battery cover plate usually adopts a ternary structure of "aluminum / steel cover plate + plastic injection + metal pole", in which the plastic (such as PP, PPS) plays the role of insulation and ultrasonic welding sealing with the shell. However, this structure has the following inherent defects: 1) poor environmental friendliness: the mixing of plastic and metal makes it difficult to separate during battery recycling, increasing the cost and environmental burden of recycling.

[0003] 2) Insufficient high temperature resistance: plastic is easy to soften and melt at high temperatures (such as more than 200°C), which may cause sealing failure, internal short circuit, and even thermal runaway.

[0004] 3) Long-term reliability risk: plastic may age in the long-term immersion of electrolyte and electrochemical environment, and the injection molding process may produce internal stress or micro-cracks, which may cause liquid leakage.

[0005] To address the foregoing problems, some existing technologies use inorganic non-metallic materials to replace the application of plastic structure, but their sealing reliability, overall structural stability and production yield still need to be further improved. SUMMARY

[0006] The present application provides a battery cover plate without plastic, which comprises a cover plate body, two pole columns, two connecting blocks, an upper insulating piece and a lower insulating piece. The cover plate body is provided with an explosion-proof area and two mounting holes. The connecting blocks are located on the back surface of the cover plate body and connected with the pole columns. The upper and lower insulating pieces are made of inorganic non-metallic materials. The upper insulating piece is arranged on the front surface of the cover plate body and corresponds to the pole columns one by one. Limiting eaves are arranged on the pole columns, and the limiting eaves and the upper insulating piece form a sealed connection area one through sealing welding. The upper insulating piece and the cover plate body are provided with connecting pieces, the front surface of the connecting pieces is sealingly welded with the upper insulating piece to form a sealed connection area two. The mounting hole is of a stepped structure, and a groove is arranged on the stepped surface. The back surface of the connecting piece covers part of the groove and is distributed with a gap from the wall of the mounting hole. During welding, the solder will melt and fill all the gaps between the connecting piece and the groove and the hole wall to form a sealed connection area three. The pole columns are fixedly connected with the connecting blocks in sequence through the upper insulating piece and the connecting piece. The lower insulating piece is arranged on the back surface of the cover plate body and is provided with a plurality of bosses. A plurality of recesses are arranged on the back surface of the cover plate body and correspond to the bosses one by one. The lower insulating piece is provided with a stepped through hole, and the through hole corresponds to the connecting block one by one. The connecting block is fixedly connected with the pole column through the corresponding through hole, and the side of the connecting block away from the pole column is clamped on the stepped surface of the through hole.

[0007] In a possible implementation, the upper insulating member, the limiting eaves, the connecting member and the recess are all annular structures and are coaxially arranged with the pole, the inner diameter of the connecting member is larger than the inner diameter of the insulating member and smaller than the inner diameter of the recess, the outer diameter of the connecting member is larger than the outer diameter of the insulating member and smaller than the outer diameter of the recess, the through hole is provided with an annular protruding portion, and the annular protruding portion is inserted into the connecting member.

[0008] In a possible implementation, the connecting member is a stepped structure and is embedded in the mounting hole.

[0009] In a possible implementation, the upper insulating member is made of alumina ceramic material and is connected to the connecting member by brazing.

[0010] In a possible implementation, the connecting member is made of alumina ceramic material and is connected to the cover body by brazing.

[0011] In a possible implementation, the lower insulating member is split type and includes a positive electrode part, an intermediate part and a negative electrode part, the intermediate part is located below the explosion-proof area, the positive electrode part and the negative electrode part both limit the intermediate part so that the intermediate part is stably located below the explosion-proof area, and the bosses are both divided into two groups and are located in the positive electrode part and the negative electrode part respectively.

[0012] In a possible implementation, the intermediate part, the positive electrode part and the negative electrode part are all provided with limiting grooves and limiting blocks, the limiting blocks on the intermediate part correspond to the limiting grooves on the positive electrode part and the negative electrode part one by one, the limiting grooves on the intermediate part correspond to the limiting blocks on the positive electrode part and the negative electrode part one by one, and the intermediate part, the positive electrode part and the negative electrode part are spliced together through cooperation of the limiting grooves and the corresponding limiting blocks.

[0013] In a possible implementation, the bosses are distributed along the circumference of the mounting hole.

[0014] In a possible implementation, the bosses are provided with clamping grooves, and the recesses are provided with inner chamfers.

[0015] The one or more technical solutions in the embodiment of the present application have the following technical effects: the battery cover plate without plastic provided by the embodiment of the present application is made of inorganic non-metallic material and metal material, and completely discards the application of plastic material, effectively improves the high-temperature resistance and long-term reliability of the battery cover plate and is convenient for recycling, and the pole and the cover plate body are sealed and stably connected together by welding the pole, the upper insulating piece and the connecting piece first, and then welding the connecting piece and the cover plate body, effectively improving the yield and reliability of the product, and the connecting piece covers the local groove and is reserved with a certain gap with the hole wall of the large-diameter area of the mounting hole, after welding, a sealing connection area three is formed to seal and connect the connecting piece, the mounting hole step surface and the hole wall as a whole, effectively improving the sealing performance of the overall structure and the stability of the connection, and facilitating welding processing, further improving the yield of the product, and in addition, the positioning of the lower insulating piece by the connecting block effectively ensures the stability and reliability of the battery cover plate for long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a top view structural schematic diagram of a battery cover plate without plastic provided by the embodiment of the present application.

[0017] Figure 2 is a front view structural schematic diagram of a cover plate body of a battery cover plate without plastic provided by the embodiment of the present application.

[0018] Figure 3 is a back view structural schematic diagram of a cover plate body of a battery cover plate without plastic provided by the embodiment of the present application.

[0019] Figure 4 is a sectional view structural schematic diagram of a battery cover plate without plastic provided by the embodiment of the present application.

[0020] Figure 5 is a local structural schematic diagram of a battery cover plate without plastic provided by the embodiment of the present application.

[0021] Figure 6 is a structural schematic diagram of a positive electrode part, an intermediate part and a negative electrode part of a battery cover plate without plastic provided by the embodiment of the present application.

[0022] In the figure: 1, cover plate body; 2, pole; 3, connecting block; 4, explosion-proof area; 5, mounting hole; 6, upper insulating piece; 7, lower insulating piece; 71, positive electrode part; 72, intermediate part; 73, negative electrode part; 74, limiting groove; 75, limiting block; 8, limiting eave; 9, connecting piece; 10, groove; 11, boss; 12, recess; 13, through hole; 14, annular protruding part; 15, clamping groove; 16, inner chamfer. DETAILED DESCRIPTION

[0023] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0024] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , a plastic-free battery cover plate, comprising a cover plate body 1, two pole columns 2 and two connecting blocks 3, the cover plate body 1 is provided with an explosion-proof area 4 and two mounting holes 5, the mounting holes 5 are symmetrically distributed, the explosion-proof area 4 is located between the mounting holes 5, which is the existing explosion-proof film structure, the cover plate body 1 is made of aluminum material, one of the pole columns 2 is a positive pole column, which adopts a full-aluminum pole column, and the other pole column 2 is a negative pole column, which adopts a copper-aluminum composite pole column.

[0025] The front surface of the cover plate body 1 is provided with an upper insulating piece 6, the upper insulating piece 6 corresponds to the pole column 2 one by one, the upper insulating piece 6 and the cover plate body 1 are provided with a connecting piece 9, and the upper insulating piece 6 and the connecting piece 9 are both annular structures. The pole column 2 is provided with a limiting eave 8 of annular structure, the limiting eave 8 and the pole column 2 are integrated structure, the pole column 2, the upper insulating piece 6, the limiting eave 8 and the connecting piece 9 are coaxially arranged, the back surface of the limiting eave 8 and the front surface of the upper insulating piece 6 are sealingly welded to form a sealing connection area one of annular structure, and the front surface of the connecting piece 9 and the back surface of the upper insulating piece 6 are sealingly welded to form a sealing connection area two of annular structure.

[0026] The mounting hole 5 is a stepped structure (as shown in Figure 5 ), a groove 10 of annular structure (as shown in Figure 2 ) is formed on the stepped surface of the mounting hole 5, the groove 10 is coaxial with the connecting piece 9, the inner diameter of the groove 10 is smaller than the outer diameter of the connecting piece 9, and the outer diameter of the groove 10 is larger than the inner diameter of the connecting piece 9, the connecting piece 9 covers part of the groove 10 and forms an annular gap between the connecting piece 9 and the hole wall of the large-diameter area of the mounting hole 5, during welding, the solder will melt and fill all the gaps between the connecting piece 9 and the groove 10 and the hole wall, forming a sealing connection area three of annular structure, the diameter of the sealing connection area three is larger than that of the sealing connection area one and the sealing connection area two, on the one hand, it effectively improves the sealing performance and the stability of the overall structure, on the other hand, it is convenient for welding processing of the sealing connection area three.

[0027] In the production process, the welding of the sealing connection area 1 and the sealing connection area 2 is completed first, at this time, the pole 2, the upper insulating piece 6 and the connecting piece 9 are pre-assembled into a stable and sealed unit module before being installed into the cover plate body 1, and then the unit module is installed into the installation hole 5, and the welding of the sealing connection area 3 is completed by sealing welding the connecting piece 9 and the cover plate body 1 together, which not only effectively improves the sealing and stability of the overall structure, but also effectively improves the yield and reliability of the product.

[0028] Referring to Figure 3 , Figure 4 and Figure 5 , the back surface of the cover plate body 1 is provided with a lower insulating piece 7, and the front surface of the lower insulating piece 7 is provided with a plurality of bosses 11, and the back surface of the cover plate body 1 is provided with a plurality of recessed holes 12 (as shown in Figure 3 ), the recessed holes 12 correspond to the bosses 11 one by one, the bosses 11 are provided with clamping grooves 15, and the recessed holes 12 are provided with inner chamfers 16, the bosses 11 are inserted into the corresponding recessed holes 12 to position the cover plate body 1 and the lower insulating piece 7, and the bosses 11 are clamped together with the cover plate body 1 through the limiting cooperation of the clamping grooves 15 on the bosses 11 and the inner chamfers 16 on the recessed holes 12. The lower insulating piece 7 is provided with a stepped through hole 13, and the through hole 13 corresponds to the connecting block 3 one by one, and the connecting block 3 is fixedly welded together with the pole 2 through the corresponding through hole 13, and the end of the connecting block 3 away from the pole 2 is clamped on the stepped surface of the through hole 13 to limit the lower insulating piece 7, so that the lower insulating piece 7 and the cover plate body 1 are stably and reliably connected together, further improving the stability and reliability of the overall structure.

[0029] The upper insulating piece 6, the connecting piece 9 and the lower insulating piece 7 are made of alumina ceramic material and are welded by brazing, which not only significantly improves the high temperature resistance of the battery cover plate, but also facilitates recycling.

[0030] The through hole 13 is provided with an annular protruding portion 14 (as shown in Figure 5 ). The annular protruding portion 14 and the lower insulating piece 7 are an integrated structure, the annular protruding portion 14 is inserted into the connecting piece 9, fully isolating the connecting block 3 and the cover plate body 1, ensuring the stability and reliability of the electrical insulation of the two. And the front surface of the annular protruding portion 14 and the back surface of the upper insulating piece 6 maintain a small gap.

[0031] Referring to Figure 4 and Figure 6 , the lower insulating piece 7 includes a positive electrode part 71, an intermediate part 72 and a negative electrode part 73, and the intermediate part 72 is located below the explosion-proof area 4, as shown in Figure 4As shown, the positive electrode part 71 and the negative electrode part 73 are respectively located on the left and right sides of the middle part 72, and both are limited to the middle part 72, so that the three are stably spliced together. The number of bosses 11 is eight and is divided into two groups respectively located in the positive electrode part 71 and the negative electrode part 73, thereby connecting the positive electrode part 71 and the negative electrode part 73 with the cover plate body 1 together. The through holes 13 are respectively located in the positive electrode part 71 and the negative electrode part 73, and the bosses 11 are distributed along the circumference of the mounting hole 5.

[0032] Referring to Figure 4 and Figure 6 , the middle part 72, the positive electrode part 71 and the negative electrode part 73 are provided with limiting grooves 74 and limiting blocks 75, and the limiting blocks 75 on the middle part 72 correspond to the limiting grooves 74 on the positive electrode part 71 and the negative electrode part 73 one by one, and the limiting grooves 74 on the middle part 72 correspond to the limiting blocks 75 on the positive electrode part 71 and the negative electrode part 73 one by one, and the limiting grooves 74 and the corresponding limiting blocks 75 are matched, so that the middle part 72 and the positive electrode part 71 and the negative electrode part 73 are spliced together. As Figure 6 shown, the left and right sides of the middle part 72 are provided with two groups of limiting blocks 75, and the right side of the positive electrode part 71 and the left side of the negative electrode part 73 are respectively provided with two groups of limiting grooves 74, and the limiting blocks 75 are respectively clamped in the corresponding limiting grooves 74. Similarly, the left and right sides of the middle part 72 are respectively provided with two groups of limiting grooves 74, and the right side of the positive electrode part 71 and the left side of the negative electrode part 73 are respectively provided with two groups of corresponding limiting blocks 75, wherein the limiting grooves 74 on the positive electrode part 71 and the negative electrode part 73 limit the corresponding limiting blocks 75 from front to back and from the front, and the limiting grooves 74 on the middle part 72 limit the corresponding limiting blocks 75 from front to back and from the back, and the whole forms an interlocking limiting structure, and in the installation process, the positive electrode part 71 and the negative electrode part 73 are spliced together with the middle part 72 in a left and right plug-in manner.

[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, or slidingly connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited by the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A plastic-free battery cover, comprising a cover body, two terminals, and two connecting blocks, wherein the cover body has an explosion-proof zone and two mounting holes, and the connecting blocks are located on the back of the cover body and connected to the terminals, characterized in that: It also includes an upper insulating component and a lower insulating component, both of which are made of inorganic non-metallic materials; The upper insulating component is located on the front of the cover plate body and corresponds one-to-one with the pole post; The pole post is provided with a limiting eave, and the limiting eave and the upper insulating part are sealed together by sealing welding to form a sealed connection area. The upper insulating component and the cover plate body are provided with a connecting component, and the front side of the connecting component is sealed and welded to the upper insulating component to form a sealed connection area two; The mounting hole has a stepped structure with grooves on the stepped surface. The back of the connector partially covers the grooves and is spaced with the wall of the mounting hole. During welding, the solder will melt and fill all the gaps between the connector and the grooves and the hole wall to form a sealed connection area. The pole passes through the upper insulating component and the connector in sequence and is fixedly connected to the connecting block; The lower insulating component is located on the back of the cover plate body, and has several protrusions on it. The back of the cover plate body has recesses that correspond one-to-one with the protrusions. The lower insulating component has stepped through holes, each corresponding to a connecting block. The connecting block passes through the corresponding through hole and is fixedly connected to the pole post. The side of the connecting block away from the pole post is stuck on the stepped surface of the through hole.

2. The plastic-free battery cover according to claim 1, characterized in that: The upper insulating component, limiting eaves, connecting component, and groove are all annular structures and are all coaxially arranged with the pole post. The inner diameter of the connecting component is larger than the inner diameter of the insulating component and smaller than the inner diameter of the groove. The outer diameter of the connecting component is larger than the outer diameter of the insulating component and smaller than the outer diameter of the groove. The through hole is provided with an annular protrusion, which is inserted into the connecting component.

3. A plastic-free battery cover according to claim 1 or 2, characterized in that: The connector has a stepped structure and is fitted into the mounting hole.

4. A plastic-free battery cover according to claim 1 or 2, characterized in that: The upper insulating component is made of alumina ceramic and is connected to the connector by brazing.

5. A plastic-free battery cover according to claim 4, characterized in that: The connector is made of alumina ceramic and is connected to the cover plate body by brazing.

6. The plastic-free battery cover according to claim 1, characterized in that: The lower insulating component is a split type, including a positive part, a middle part and a negative part. The middle part is located below the explosion-proof zone. Both the positive part and the negative part limit the middle part to make it stably located below the explosion-proof zone. The bosses are divided into two groups and located in the positive part and the negative part respectively.

7. A plastic-free battery cover according to claim 6, characterized in that: Limiting grooves and limiting blocks are provided on the middle part, the positive electrode part, and the negative electrode part. The limiting blocks on the middle part correspond one-to-one with the limiting grooves on the positive electrode part and the negative electrode part, and the limiting grooves on the middle part correspond one-to-one with the limiting blocks on the positive electrode part and the negative electrode part. Through the cooperation of the limiting grooves and the corresponding limiting blocks, the middle part is spliced ​​together with the positive electrode part and the negative electrode part.

8. A plastic-free battery cover according to claim 6, characterized in that: The bosses are distributed circumferentially along the mounting holes.

9. A plastic-free battery cover according to any one of claims 1, 6, and 8, characterized in that: The boss is provided with a slot, and the concave hole is provided with an inner chamfer.

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