Cover plate for preventing poor side voltage of battery cell

Abstract

The utility model provides a cover plate for preventing poor voltage at the edge of a battery cell, which comprises an aluminum plate, pole holes are arranged at two ends of the aluminum plate, and a coating layer is sprayed on the surface of the aluminum plate; the four insulating sheets are attached to the two ends of the top of the aluminum plate and the two ends of the bottom of the aluminum plate respectively; the two polar plates are arranged at the two ends of the top of the aluminum plate respectively, and the bottoms of the two polar plates are attached to the bottom of the insulating sheet. According to the cover plate capable of preventing the poor voltage at the edge of the battery cell, the coating layer is sprayed on the surface of the aluminum plate, so that the insulation performance is excellent, the insulation performance of the cover plate can be effectively enhanced, even if local conduction is caused by internal and external reasons, the insulation coating material can still effectively isolate an ion migration path, and the service life of the battery cell is prolonged. Lithium ions are prevented from being embedded, so that the corrosion reaction is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery cover technology, and in particular to a cover that prevents poor voltage at the edge of the battery cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, and the requirements for the performance and safety of lithium-ion batteries are becoming increasingly stringent.

[0003] As an accessory in lithium-ion batteries, the lithium battery cover plate firstly seals the internal and external environments by welding it to the aluminum shell, and secondly connects the internal and external circuits, allowing the internal current of the battery to be transported to the outside through the terminals of the cover plate, thus playing a current guiding role.

[0004] Currently, most lithium battery covers on the market feature a positive electrode micro-conductivity design, which makes the positive electrode post and the plate slightly conductive, raising the potential of the aluminum shell to prevent abnormal cell corrosion. However, the resistance of the positive electrode micro-conductivity structure changes significantly during the later cell manufacturing process, and the insulation between the negative electrode and the plate cannot be fully guaranteed, making it difficult to prevent corrosion reactions.

[0005] Therefore, it is necessary to provide a cover plate to prevent poor cell side voltage and solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides a cover plate to prevent poor edge voltage of the battery cell, which solves the problems of large resistance changes in the positive electrode micro-conductivity during the later stages of battery cell manufacturing, and difficulty in completely ensuring the insulation between the negative electrode and the plate, making it difficult to prevent corrosion reactions.

[0007] To solve the above-mentioned technical problems, this utility model provides a cover plate for preventing poor voltage at the battery cell edge, comprising:

[0008] An aluminum plate, wherein pole holes are provided at both ends of the aluminum plate, and a coating layer is sprayed on the surface of the aluminum plate;

[0009] Insulating sheets are provided at both the top and bottom of the aluminum plate;

[0010] An electrode plate is disposed on the top of the aluminum plate, and the bottom of the electrode plate is attached to the bottom of the insulating sheet;

[0011] A positive electrode post, wherein the positive electrode post is disposed on the inner side of one of the electrode post holes;

[0012] The negative terminal is disposed on the inner side of another terminal hole;

[0013] An explosion-proof film is disposed on the top of the aluminum plate.

[0014] Preferably, the four insulating sheets are respectively attached to both ends of the top and bottom of the aluminum plate; the two electrode plates are respectively disposed at both ends of the top of the aluminum plate, and the bottom of the two electrode plates are attached to the bottom of the insulating sheets; the four insulating sheets and the two electrode plates are respectively sleeved on the outer sides of the positive electrode post and the negative electrode post.

[0015] Preferably, the bottom of the blue film is adhered to the top of the aluminum plate.

[0016] Preferably, each of the four insulating sheets has a first positioning hole inside both ends.

[0017] Preferably, the aluminum plate has four second positioning holes at both the top and bottom, and the eight second positioning holes are respectively located at the top and bottom of the two pole holes.

[0018] Preferably, a second positioning post is provided at both ends of the top of the positive electrode post and the negative electrode post, and a first positioning post is provided at both ends of the bottom of the two electrode plates.

[0019] Preferably, both the first positioning post and the second positioning post are engaged inside the first positioning hole and the second positioning hole.

[0020] Compared with related technologies, the cover plate provided by this utility model for preventing poor voltage at the battery cell edge has the following beneficial effects:

[0021] This utility model provides a cover plate to prevent poor voltage at the edge of the battery cell. By spraying a coating layer on the surface of the aluminum plate, the insulation performance is excellent and can effectively enhance the insulation performance of the cover plate. Even if local conductivity is caused by internal or external reasons, the insulating coating material can still effectively block the ion migration path and prevent lithium ion embedding, thereby interrupting the corrosion reaction.

[0022] Furthermore, by inserting the second positioning pins on the positive and negative terminals into the first positioning hole of the insulating sheet at the bottom of the aluminum plate and the second positioning hole at the bottom of the aluminum plate, the insulating sheet, positive terminal, and negative terminal at the bottom of the aluminum plate can be positioned. Similarly, by inserting the first positioning holes on the two electrode plates into the first positioning hole at the top of the insulating sheet at the top of the aluminum plate and the second positioning hole at the top of the aluminum plate, the insulating sheet at the top of the aluminum plate and the two electrode plates can be positioned. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a first embodiment of a cover plate for preventing poor voltage at the edge of a battery cell provided by this utility model;

[0024] Figure 2 for Figure 1 The diagram shows the exploded structure.

[0025] Figure 3 for Figure 1 The diagram shows a top view of the structure.

[0026] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at point AA is shown.

[0027] Figure 5 for Figure 4 The enlarged schematic diagram of section B is shown below;

[0028] Figure 6 A schematic diagram of the structure of a second embodiment of a cover plate for preventing poor voltage at the edge of a battery cell provided by this utility model;

[0029] Figure 7 for Figure 6 The diagram shows the bottom structure of the electrode plate.

[0030] The following are the labels in the diagram: 1. Positive electrode post, 2. Electrode plate, 3. Insulating sheet, 4. Aluminum plate, 41. Electrode post hole, 5. Negative electrode post, 6. Explosion-proof valve, 7. Blue film, 8. First positioning hole, 9. Second positioning hole, 10. First positioning post, 11. Second positioning post. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] First Embodiment

[0033] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a cover plate for preventing poor voltage at the edge of a battery cell provided by this utility model; Figure 2 for Figure 1 The diagram shows the exploded structure. Figure 3 for Figure 1 The diagram shows a top view of the structure. Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at point AA is shown. Figure 5 for Figure 4 The enlarged schematic diagram of part B is shown.

[0034] A cover plate for preventing poor cell-side voltage, comprising:

[0035] Aluminum plate 4, both ends of the aluminum plate 4 are provided with pole post holes 41, and the surface of the aluminum plate is coated with a coating layer.

[0036] Insulating sheet 3 is provided at both the top and bottom of the aluminum plate 4;

[0037] Electrode 2, wherein the electrode 2 is disposed on the top of the aluminum plate 4, and the bottom of the electrode 2 is attached to the bottom of the insulating sheet 3;

[0038] Positive electrode post 1, wherein the positive electrode post 1 is disposed on the inner side of one of the electrode post holes 41;

[0039] The negative terminal 5 is disposed on the inner side of another terminal hole 41;

[0040] An explosion-proof film 6 is disposed on the top of the aluminum plate 4.

[0041] Preferably, a blue film 7 is provided on the top of the explosion-proof film 6.

[0042] The four insulating sheets 3 are respectively attached to the two ends of the top and the two ends of the bottom of the aluminum plate 4; the two electrode plates 2 are respectively disposed at the two ends of the top of the aluminum plate 4, and the bottom of the two electrode plates 2 are attached to the bottom of the insulating sheets 3; the four insulating sheets 3 and the two electrode plates 2 are respectively sleeved on the outer side of the positive electrode post 1 and the negative electrode post 5.

[0043] The bottom of the blue film 7 is adhered to the top of the aluminum plate 4.

[0044] Both the positive terminal 1 and the negative terminal 5 are made of copper. The inner wall of the terminal hole 41 needs to be uniformly sprayed with insulating material to ensure the insulation performance of the cover plate.

[0045] The aluminum plate 4 has an pole hole 41, and the material of the aluminum plate 4 can be aluminum alloy 3 series and 6 series, etc.

[0046] The coating layer is an insulating material, which can be PP, PE, PI or UV material. The spraying distance of the insulating material should be more than 2mm away from the four sides of the aluminum plate 4. The insulating spraying process of the aluminum plate 4 can be UV spraying, electrostatic spraying, printing spraying, etc., and the spraying thickness is controlled between 10μm and 100μm.

[0047] The insulating sheet 3 can be made of PP, PE, PPS, PI, or PTFE.

[0048] This structure saves on commonly used materials such as bottom plastic, sealing rings, and top plastic. It has a simple structure, is easy to assemble, and has low material costs.

[0049] The working principle of the cover plate for preventing poor voltage at the edge of the battery cell provided by this utility model is as follows:

[0050] During assembly, two insulating sheets 3 are respectively fitted onto the outer surfaces of the positive terminal 1 and the negative terminal 5, and then the positive terminal 1 and the negative terminal 5 are passed through the inside of the terminal hole 41.

[0051] Next, two more insulating sheets 3 are fitted onto the outer sides of the positive electrode post 1 and the negative electrode post 5, with the two insulating sheets 3 positioned on top of the aluminum plate 4. Then, two electrode plates 2 are fitted onto the outer sides of the positive electrode post 1 and the negative electrode post 5, respectively, and positioned on top of the two insulating sheets 3. Finally, the cover plate assembly is completed by riveting the electrode posts.

[0052] Compared with related technologies, the cover plate provided by this utility model for preventing poor voltage at the battery cell edge has the following beneficial effects:

[0053] By spraying a coating layer onto the surface of aluminum plate 4, the insulation performance is excellent, which can effectively enhance the insulation performance of the cover plate. Even if local conductivity is caused by internal or external reasons, the insulating coating material can still effectively block the ion migration path and prevent lithium ion embedding, thereby interrupting the corrosion reaction.

[0054] Second Embodiment

[0055] Please refer to the following: Figure 6 and Figure 7 Based on the cover plate for preventing poor cell edge voltage provided in the first embodiment of this application, the second embodiment of this application proposes another cover plate for preventing poor cell edge voltage. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0056] Specifically, the second embodiment of this application provides a cover plate for preventing poor voltage at the edge of the battery cell, which differs in that the cover plate for preventing poor voltage at the edge of the battery cell has a first positioning hole 8 opened inside both ends of the four insulating sheets 3.

[0057] The aluminum plate 4 has four second positioning holes 9 at its top and bottom, and the eight second positioning holes 9 are respectively located at the top and bottom of the two pole hole 41.

[0058] The positive electrode post 1 and the negative electrode post 5 are each provided with a second positioning post 11 at both ends of the top, and the two electrode plates 2 are each provided with a first positioning post 10 at both ends of the bottom.

[0059] The first positioning post 10 and the second positioning post 11 are both engaged inside the first positioning hole 8 and the second positioning hole 9.

[0060] The diameter of the first positioning hole 8 and the second positioning hole 9 is 1mm-5mm.

[0061] The working principle of the cover plate for preventing poor voltage at the edge of the battery cell provided by this utility model is as follows:

[0062] In use, four insulating sheets 3 are respectively placed at the top and bottom ends of the aluminum plate 4, and the first positioning holes 8 on the four insulating sheets 3 correspond to the eight second positioning holes 9 on the top and bottom of the aluminum plate 4. Then, the positive electrode 1 and the negative electrode 5 pass through the inside of the insulating sheets 3 at the bottom ends of the aluminum plate 4, and the top of the positive electrode 1 and the negative electrode 5 pass through the electrode hole 41. The second positioning pins 11 installed on the positive electrode 1 and the negative electrode 5 pass through the first positioning holes 8 on the two insulating sheets 3 at the bottom of the aluminum plate 4, and are then inserted into the inside of the second positioning holes 9 at the bottom of the aluminum plate 4, thereby limiting the position of the positive electrode 1, the negative electrode 5 and the insulating sheets 3.

[0063] Then, the two electrode plates 2 are placed on top of the aluminum plate 4 and fitted onto the outer sides of the positive electrode post 1 and the negative electrode post 5. At the same time, the second positioning post 11 passes through the first positioning hole 8 opened on the two insulating sheets 3 on the top of the aluminum plate 4, and is then inserted into the second positioning hole 9 opened on the top of the aluminum plate 4, thereby limiting the two electrode plates 2.

[0064] Compared with related technologies, the cover plate provided by this utility model for preventing poor voltage at the battery cell edge has the following beneficial effects:

[0065] By inserting the second positioning post 11 on the positive electrode post 1 and the negative electrode post 5 into the first positioning hole 8 and the second positioning hole 9 on the bottom of the aluminum plate 4, the insulating sheet 3, the positive electrode post 1 and the negative electrode post 5 on the bottom of the aluminum plate 4 can be positioned. Similarly, by inserting the first positioning hole 10 on the two electrode plates 2 into the first positioning hole 8 on the top of the insulating sheet 3 and the second positioning hole 9 on the top of the aluminum plate 4, the insulating sheet 3 and the two electrode plates 2 on the top of the aluminum plate 4 can be positioned.

[0066] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cover plate for preventing poor voltage at the edge of a battery cell, characterized in that, include: An aluminum plate, wherein pole holes are provided at both ends of the aluminum plate, and a coating layer is sprayed on the surface of the aluminum plate; Insulating sheets are provided at both the top and bottom of the aluminum plate; An electrode plate is disposed on the top of the aluminum plate, and the bottom of the electrode plate is attached to the bottom of the insulating sheet; A positive electrode post, wherein the positive electrode post is disposed on the inner side of one of the electrode post holes; The negative terminal is disposed on the inner side of another terminal hole; An explosion-proof film is disposed on the top of the aluminum plate.

2. The cover plate for preventing poor voltage at the cell edge according to claim 1, characterized in that, The four insulating sheets are respectively attached to the two ends of the top and the two ends of the bottom of the aluminum plate; the two electrode plates are respectively disposed at the two ends of the top of the aluminum plate, and the bottom of the two electrode plates are attached to the bottom of the insulating sheets; the four insulating sheets and the two electrode plates are respectively sleeved on the outer side of the positive electrode post and the negative electrode post.

3. A cover plate for preventing poor voltage at the cell edge according to claim 1, characterized in that, It also includes a blue film, the bottom of which is adhered to the top of the aluminum plate.

4. A cover plate for preventing poor voltage at the edge of the battery cell according to claim 1, characterized in that, Each of the four insulating sheets has a first positioning hole inside both ends.

5. A cover plate for preventing poor voltage at the edge of the battery cell according to claim 4, characterized in that, The aluminum plate has four second positioning holes at its top and bottom, and the eight second positioning holes are respectively located at the top and bottom of the two pole holes.

6. A cover plate for preventing poor voltage at the cell edge according to claim 5, characterized in that, The positive electrode and the negative electrode are each provided with a second positioning post at both ends of the top, and the two electrodes are each provided with a first positioning post at both ends of the bottom.

7. A cover plate for preventing poor voltage at the cell edge according to claim 6, characterized in that, Both the first positioning post and the second positioning post are engaged inside the first positioning hole and the second positioning hole, respectively.

Images