Light aluminum sheet structure and cover plate assembly

Abstract

The utility model discloses a light aluminum sheet structure and a cover plate assembly, and the light aluminum sheet structure comprises a light aluminum sheet body, an installation hole, and a protruding part. The mounting hole is formed in the middle of the light aluminum sheet body; the lug boss is arranged on the upper surface of the light aluminum sheet body, and one end of the lug boss extends to the mounting hole; when the anti-explosion valve protection sheet is attached to the upper surface of the aluminum polishing sheet body through the back adhesive layer, the protruding part jacks up the back adhesive layer, and a gap communicated with the mounting hole is formed between the back adhesive layer and the protruding part. Through the arrangement, when helium detection is carried out, a passage through which gas can penetrate through the explosion-proof valve and penetrate out of the mounting hole can be formed, so that the detection of liquid leakage at the explosion-proof valve in the mounting hole is completed, namely, the explosion-proof valve does not need to be independently detected, and the purposes of facilitating detection and improving the detection speed are achieved.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a bare aluminum sheet structure and a cover plate assembly. Background Art

[0002] Lithium battery cell hard shell components can be divided into cylindrical and square components, mainly including shell, cover plate, connecting bar and other components. Among them, the main function of the cover plate is to seal the positive and negative electrodes and electrolyte of the battery to prevent leakage of electrolyte and avoid safety accidents. At the same time, the cover plate also has the functions of stabilizing the internal pressure of the battery, balancing the electrochemical reaction, and preventing interference from external substances.

[0003] At present, lithium batteries are usually required to be tested for leakage by helium detection before leaving the factory. In the prior art, the residual thickness of the explosion-proof valve is prone to leakage due to the cold welding between the bare aluminum sheet and the explosion-proof valve included in the cover assembly during the laser welding process. However, in the existing cover structure, in order to protect the explosion-proof valve, the explosion-proof valve protection sheet is usually installed at the mounting hole of the bare aluminum sheet by adhesive bonding. Due to the sealed connection between the explosion-proof valve protection sheet and the opening on one side of the mounting hole, a one-way opening chamber is formed between the explosion-proof valve protection sheet, the explosion-proof valve placed in the mounting hole, and the mounting hole, which makes it difficult for gas to pass through the mounting hole during the helium detection process. Accordingly, it is impossible to identify whether the explosion-proof valve is leaking. Therefore, it is necessary to use other methods to detect the explosion-proof valve separately, which is very inconvenient to operate.

[0004] Therefore, a bare aluminum sheet structure and a cover plate assembly are needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a bare aluminum sheet structure and a cover plate assembly, so as to detect whether there is leakage at an explosion-proof valve by means of helium detection, thereby improving the detection rate.

[0006] In order to solve the above technical problems, the utility model provides a smooth aluminum sheet structure, including a smooth aluminum sheet body, a mounting hole and a protrusion;

[0007] The mounting hole is arranged in the middle of the light aluminum sheet body;

[0008] The protrusion is arranged on the upper surface of the aluminum sheet body, and one end of the protrusion extends to the mounting hole;

[0009] When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the protrusion lifts up the adhesive layer, so that a gap connected to the mounting hole is formed between the adhesive layer and the protrusion.

[0010] Furthermore, one or more protrusions are provided.

[0011] Furthermore, the cross section of the raised portion is triangular, rectangular or arc-shaped.

[0012] Furthermore, the cross-sectional area of ​​the protrusion decreases from top to bottom.

[0013] Furthermore, the cross-sectional area of ​​the raised portion is an inverted isosceles trapezoidal structure.

[0014] On the other hand, the utility model also provides a smooth aluminum sheet structure, including a smooth aluminum sheet body, a mounting hole and a groove;

[0015] The mounting hole is arranged in the middle of the light aluminum sheet body;

[0016] The groove is arranged on the upper surface of the aluminum sheet body, and one end of the groove extends to communicate with the mounting hole;

[0017] When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the adhesive layer covers a portion of the groove.

[0018] Furthermore, the groove is configured as a long strip structure.

[0019] Furthermore, one or more grooves are provided.

[0020] On the other hand, the utility model also provides a cover plate assembly, comprising the bare aluminum sheet structure and the explosion-proof valve protection sheet described in the above embodiment;

[0021] When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the explosion-proof valve protection sheet is placed inside the mounting hole, and a gas flow gap is formed between the explosion-proof valve protection sheet and the inner wall of the mounting hole.

[0022] Furthermore, the adhesive layer is disposed around the outer wall of the explosion-proof valve protection sheet.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] A protrusion extending to the mounting hole is provided on the upper surface of the bare aluminum sheet body, so that when the explosion-proof valve protection sheet is installed and connected to the bare aluminum sheet body, the back adhesive layer of the explosion-proof valve protection sheet will be lifted up by the protrusion, so that a gap connected to the mounting hole is formed between the protrusion and the back adhesive layer, and then when helium detection is performed, gas can pass through the passage formed by the gap and the mounting hole, thereby completing the detection of whether there is leakage at the explosion-proof valve placed in the mounting hole, that is, there is no need to detect the explosion-proof valve separately, so as to achieve the purpose of facilitating detection and improving detection rate.

[0025] Furthermore, by providing a groove connected to the mounting hole on the upper surface of the smooth aluminum sheet body, when the explosion-proof valve protection sheet is installed and connected to the smooth aluminum sheet body, the back adhesive layer only covers a part of the groove. When the helium test is performed, the gas can pass through the passage formed by the mounting hole and the groove, and the detection of whether there is leakage at the explosion-proof valve can also be completed. Compared with the method of providing a protrusion, this device is more convenient to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a bare aluminum sheet structure in one embodiment of the utility model;

[0027] Figure 2 This is a cross-sectional view of a bare aluminum sheet structure in one embodiment of the utility model;

[0028] Figure 3 It is a side cross-sectional view of a raised portion of a light aluminum sheet structure in an embodiment of the present utility model, in which the raised portion is an inverted isosceles trapezoidal structure;

[0029] Figure 4 This is a schematic structural diagram of a bare aluminum sheet structure in another embodiment of the utility model;

[0030] Figure 5 It is a top view of a bare aluminum sheet structure in another embodiment of the utility model;

[0031] Figure 6 It is a structural explosion diagram of a cover plate assembly in one embodiment of the utility model.

[0032] Figure numbers: 1. Plain aluminum sheet body; 2. Mounting hole; 3. Raised portion; 4. Explosion-proof valve protection sheet; 41. Adhesive layer; 5. Groove. DETAILED DESCRIPTION

[0033] The following will be combined with schematic diagrams to describe the light aluminum sheet structure and cover plate assembly of the utility model in more detail, wherein the preferred embodiment of the utility model is shown, and it should be understood that the utility model described herein can be modified by those skilled in the art, while still achieving the beneficial effects of the utility model. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the utility model.

[0034] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0035] Embodiment 1

[0036] like Figures 1 to 3As shown, an embodiment of the utility model proposes a smooth aluminum sheet structure, including a smooth aluminum sheet body 1, a mounting hole 2 and a protrusion 3.

[0037] The mounting hole 2 is arranged in the middle of the bare aluminum sheet body 1 and is used for mounting the explosion-proof valve and the explosion-proof valve protection sheet 4 .

[0038] The raised portion 3 is arranged on the upper surface of the smooth aluminum sheet body 1, and one end extends to the mounting hole 2, and is used to lift the adhesive layer 41 of the explosion-proof valve protection sheet 4, so that a gap is formed between the adhesive layer 41 and the raised portion 3, so that during the helium detection process, the gas can pass through the explosion-proof valve in sequence and pass out from the mounting hole 2, thereby realizing the detection of whether there is liquid leakage at the explosion-proof valve.

[0039] Specifically, when the explosion-proof valve protection sheet 4 is attached to the upper surface of the plain aluminum sheet body 1 through the adhesive layer 41 , the raised portion 3 lifts up the adhesive layer 41 , so that a gap connected to the mounting hole 2 is formed between the adhesive layer 41 and the raised portion 3 .

[0040] It should be noted that a gas flow gap is formed between the explosion-proof valve protection sheet 4 and the inner wall of the mounting hole 2, that is, the explosion-proof valve protection sheet 4 is suspended in the mounting hole 2, and the positioning installation is completed by bonding the adhesive layer 41 to the upper surface of the plain aluminum sheet body 1. The gas flow gap enables the gap to be connected to the mounting hole 2 to ensure that a passage can be formed, thereby improving the accuracy of the detection of whether there is leakage at the explosion-proof valve.

[0041] The device is provided with a protrusion 3 extending to the mounting hole 2 on the upper surface of the bare aluminum sheet body 1, so that when the explosion-proof valve protection sheet 4 is installed and connected to the bare aluminum sheet body 1, the back adhesive layer 41 of the explosion-proof valve protection sheet 4 will be lifted by the protrusion 3, so that a gap connected to the mounting hole 2 is formed between the protrusion 3 and the back adhesive layer 41, and then when the helium detection is performed, the gas can pass through the passage formed by the gap and the mounting hole 2, thereby completing the detection of whether the explosion-proof valve placed in the mounting hole 2 is leaking, that is, there is no need to detect the explosion-proof valve separately, so as to achieve the purpose of facilitating detection and improving the detection rate.

[0042] In this embodiment, one or more protrusions 3 are provided. When multiple protrusions 3 are provided, multiple protrusions 3 are provided along the periphery of the mounting hole 2 to form multiple passages for gas circulation, further improving the accuracy of detection.

[0043] In a further embodiment, the cross-section of the protrusion 3 is triangular, rectangular or arc-shaped, and can also be set to other shapes, that is, when the protrusion 3 is bonded to the backing adhesive layer 41, a gap connected to the mounting hole 2 can be formed for gas circulation.

[0044] In other embodiments, in order to better form the gap, the shape of the protrusion 3 is further limited. Specifically, the cross-sectional area of ​​the protrusion 3 decreases from top to bottom.

[0045] like Figure 3 As shown, preferably, the cross-sectional area of ​​the raised portion 3 is an inverted isosceles trapezoidal structure, so that a triangular gap is formed between the outer wall of the raised portion 3 and the adhesive layer 41, thereby improving the gas circulation effect during helium detection, and accordingly, can effectively improve the accuracy of detecting whether there is leakage at the explosion-proof valve.

[0046] Embodiment 2

[0047] like Figure 4 and Figure 5 As shown, the difference between this embodiment and the first embodiment is that the protrusion 3 is replaced by a groove 5, so that the processing difficulty of the device is reduced while facilitating the detection of whether there is leakage at the explosion-proof valve.

[0048] Specifically, a smooth aluminum sheet structure includes a smooth aluminum sheet body 1, a mounting hole 2 and a groove 5.

[0049] The mounting hole 2 is arranged in the middle of the light aluminum sheet body 1 .

[0050] The groove 5 is arranged on the upper surface of the aluminum sheet body 1 , and one end thereof extends to communicate with the mounting hole 2 .

[0051] When the explosion-proof valve protection sheet 4 is attached to the upper surface of the smooth aluminum sheet body 1 through the adhesive layer 41 , the adhesive layer 41 covers a portion of the groove 5 .

[0052] The device is provided with a groove 5 connected to the mounting hole 2 on the upper surface of the plain aluminum sheet body 1, so that when the explosion-proof valve protection sheet 4 is installed and connected to the plain aluminum sheet body 1, the back adhesive layer 41 only covers a part of the groove 5, and then when the helium detection is performed, the gas can pass through the passage formed by the mounting hole 2 and the groove 5, and the detection of whether there is leakage at the explosion-proof valve can also be completed. Moreover, since only a groove 5 needs to be provided along the side wall of the mounting hole 2 to achieve the above function, compared with the method of forming a protrusion 3 with one end extending to the mounting hole 2 on the upper surface of the plain aluminum sheet body 1, the device is more convenient to process, so the purpose of facilitating the detection of whether there is leakage at the explosion-proof valve and reducing the difficulty of device processing is achieved.

[0053] In this embodiment, the groove 5 is configured as a long strip structure, and may also be configured as other shapes, which are not limited here.

[0054] In addition, one or more grooves 5 are provided. When there are multiple grooves 5, the multiple grooves 5 are arranged along the periphery of the mounting hole 2 to improve the accuracy of detection.

[0055] Embodiment 3

[0056] like Figure 6 As shown, this embodiment further proposes a cover plate assembly based on the first or second embodiment, so as to detect whether there is leakage at the explosion-proof valve by helium detection.

[0057] Specifically, the cover plate assembly includes a bare aluminum sheet structure and an explosion-proof valve protection sheet 4 .

[0058] Among them, when the explosion-proof valve protection sheet 4 is adhered to the upper surface of the smooth aluminum sheet body 1 through the adhesive layer 41, the explosion-proof valve protection sheet 4 is placed inside the mounting hole 2, and a gas flow gap is formed between the inner wall of the mounting hole 2, ensuring that the gap formed by the protrusion 3 and the adhesive layer 41 can be connected to the mounting hole 2, thereby ensuring that the detection of whether there is leakage at the explosion-proof valve can be completed.

[0059] It should be noted that the adhesive layer 41 is disposed around the outer wall of the explosion-proof valve protection sheet 4 so that the explosion-proof valve protection sheet 4 is suspended in the mounting hole 2, that is, used to form the gas flow gap mentioned above.

[0060] In addition, the cover plate assembly also includes a positive pole and a negative pole (not numbered in the figure), which are both arranged on the bare aluminum sheet body 1 and are respectively located on both sides of the mounting hole 2. This is the prior art and will not be described in detail here.

[0061] The cover plate assembly proposed in this embodiment enables a passage connected to the mounting hole 2 to be formed between the bare aluminum sheet structure and the explosion-proof valve protection sheet 4. Therefore, during helium detection, gas can pass through the explosion-proof valve and out through the passage, thereby realizing the function of detecting whether there is leakage at the explosion-proof valve by helium detection. There is no need to perform a separate detection of leakage at the explosion-proof valve, thereby improving the convenience of detection.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A bare aluminum sheet structure, characterized in that: It includes a plain aluminum sheet body, a mounting hole and a raised portion; The mounting hole is arranged in the middle of the light aluminum sheet body; The protrusion is arranged on the upper surface of the aluminum sheet body, and one end of the protrusion extends to the mounting hole; When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the protrusion lifts up the adhesive layer, so that a gap connected to the mounting hole is formed between the adhesive layer and the protrusion.

2. The light aluminum sheet structure according to claim 1, characterized in that: The number of the protrusions is one or more.

3. The light aluminum sheet structure according to claim 1, characterized in that: The cross section of the protrusion is triangular, rectangular or arc-shaped.

4. The light aluminum sheet structure according to claim 1, characterized in that: The cross-sectional areas of the protrusions decrease from top to bottom.

5. The light aluminum sheet structure according to claim 4, characterized in that: The cross-sectional area of ​​the protrusion is an inverted isosceles trapezoidal structure.

6. A light aluminum sheet structure, characterized in that: It includes a plain aluminum sheet body, mounting holes and grooves; The mounting hole is arranged in the middle of the light aluminum sheet body; The groove is arranged on the upper surface of the aluminum sheet body, and one end of the groove extends to communicate with the mounting hole; When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the adhesive layer covers a portion of the groove.

7. The light aluminum sheet structure according to claim 6, characterized in that: The groove is configured as a long strip structure.

8. The light aluminum sheet structure according to claim 6, characterized in that: The number of the grooves is one or more.

9. A cover plate assembly, characterized in that: It comprises a bare aluminum sheet structure as described in any one of claims 1 to 8 and an explosion-proof valve protection sheet; When the explosion-proof valve protection sheet is attached to the upper surface of the plain aluminum sheet body through the adhesive layer, the explosion-proof valve protection sheet is placed inside the mounting hole, and a gas flow gap is formed between the explosion-proof valve protection sheet and the inner wall of the mounting hole.

10. The cover plate assembly according to claim 9, characterized in that: The adhesive layer is disposed around the outer wall of the explosion-proof valve protection sheet.

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