Battery end cover structure and battery

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery end cover structure and a battery. The battery end cover structure comprises a cover plate, a patch and a double-sided adhesive tape, wherein the cover plate is provided with an anti-explosion valve; the patch is located on the outer side face of the cover plate and covers the anti-explosion valve. The double-sided adhesive tape is bonded between the cover plate and the patch and extends along the edge of the patch. The battery comprises a battery shell, a pole group arranged in the battery shell and a battery end cover structure, wherein the battery end cover structure covers an opening of the battery shell. According to the battery end cover structure in the scheme, the double-sided adhesive tape is adhered between the cover plate and the patch, so that the patch is more firmly adhered to the explosion-proof valve and is not easy to fall off, and the anti-fouling effect on the explosion-proof valve is achieved. In addition, the double-sided adhesive tape extends along the edge of the patch, so that the sealing performance is improved, and the antifouling effect is ensured. The battery in the scheme comprises the battery end cover structure, so that the battery has all the beneficial effects of the battery end cover structure.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery end cover structure and a battery. Background Art

[0002] At present, lithium-ion batteries are widely used due to their high energy density and excellent cycle performance. In order to meet different application scenarios, lithium-ion batteries are designed as hard packs and soft packs. Among them, the hard pack is usually composed of a shell, a pole group and an end cover, the pole group is arranged inside the shell, and the end cover is arranged to cover the opening of the shell.

[0003] Specifically, the shell is filled with electrolyte, which reacts chemically with the positive and negative electrodes of the electrode group to discharge. At the same time, gas is also generated in the chemical reaction, so the end cap of the lithium-ion battery is often equipped with an explosion-proof valve to release gas pressure. In addition, a transparent patch is generally attached to the outer side of the explosion-proof valve to protect the explosion-proof valve structure and avoid dust and other pollution.

[0004] However, the bonding strength between the transparent patch and the explosion-proof valve is low and is easy to fall off, thereby causing missing bonding and losing the anti-fouling effect on the explosion-proof valve. Utility Model Content

[0005] In view of this, the utility model provides a battery end cover structure and a battery to solve the problem that the existing transparent patch has low bonding strength with the explosion-proof valve and is easy to fall off, thus causing missing bonding and losing the anti-fouling effect on the explosion-proof valve.

[0006] In the first aspect, the utility model provides a battery end cover structure, including a cover plate, a patch and a double-sided adhesive strip. The cover plate is provided with an explosion-proof valve; the patch is located on the outer side of the cover plate and covers the explosion-proof valve; the double-sided adhesive strip is bonded between the cover plate and the patch, and the double-sided adhesive strip extends along the edge of the patch.

[0007] In an optional implementation, the patch overlaps with the edge of the air vent of the explosion-proof valve, and the overlapping distance is less than or equal to the width of the double-sided adhesive strip.

[0008] In an optional embodiment, a notch is provided at the edge of the patch, and a distance that the notch extends radially along the patch is greater than an overlapping distance between the patch and the edge of the air vent.

[0009] In an optional embodiment, there are at least two notches, and the double-sided adhesive strip has at least two sections; a gap is formed between two adjacent sections of the double-sided adhesive strip, the gap corresponds to the notch, and the width of the gap is greater than or equal to the width of the notch.

[0010] In an optional embodiment, the overlap distance between the patch and the edge of the ventilation opening is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip is 1.5 mm to 3 mm.

[0011] In an optional embodiment, the ratio of the distance that the notch extends in the radial direction of the patch to the length of the patch is in a range of 1:8 to 1:25.

[0012] In an optional embodiment, the width of the notch is 1 mm to 4 mm, and / or the width of the gap is 2 mm to 10 mm.

[0013] In an optional implementation, the patch is made of a colorless and transparent material, and the double-sided adhesive strip is a fluorescent adhesive film.

[0014] In an optional implementation, the patch is made of a colorless transparent material, and the double-sided adhesive strip is a colored adhesive film.

[0015] In a second aspect, the utility model further provides a battery, comprising a battery housing, a pole group disposed inside the battery housing, and the battery end cover structure in the first aspect, wherein the battery end cover structure covers an opening of the battery housing.

[0016] Beneficial effects:

[0017] In the first aspect, the present invention proposes a battery end cover structure, wherein a double-sided adhesive strip is bonded between the cover plate and the patch, so that the patch is more firmly attached to the explosion-proof valve and is not easy to fall off, thereby preventing the explosion-proof valve from being contaminated. In addition, the double-sided adhesive strip extends along the edge of the patch to increase the sealing performance and ensure the anti-contamination effect.

[0018] In this solution, the battery of the second aspect includes the battery end cover structure of the first aspect, so the battery of the second aspect has all the beneficial effects of the battery end cover structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 An exploded view of the battery end cover structure according to an embodiment of the utility model;

[0021] Figure 2 A top view of the battery end cover structure according to an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of bonding the patch and the double-sided adhesive strip according to an embodiment of the utility model;

[0023] Figure 4This is a dimensional relationship diagram of the patch, vent and double-sided adhesive strip described in the embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 100. Battery end cover structure; 110. Cover plate; 120. Patch; 130. Double-sided adhesive strip; 111. Explosion-proof valve; 112. Pole; 1111. Ventilation port; 121. Notch; 131. Gap. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] In order to deepen the understanding of the solution of the utility model, it is necessary to elaborate on the technical problems in detail in combination with relevant technologies. The specific contents are as follows:

[0028] At present, lithium-ion batteries are widely used due to their high energy density and excellent cycle performance. In order to meet different application scenarios, lithium-ion batteries are designed as hard packs and soft packs. Among them, the hard pack is usually composed of a shell, a pole group and an end cover, the pole group is arranged inside the shell, and the end cover is arranged to cover the opening of the shell.

[0029] Specifically, the shell is filled with electrolyte, which reacts chemically with the positive and negative electrodes of the electrode group to discharge. At the same time, gas is also generated in the chemical reaction, so the end cap of the lithium-ion battery is often equipped with an explosion-proof valve to release gas pressure. In addition, a transparent patch is generally attached to the outer side of the explosion-proof valve to protect the explosion-proof valve structure and avoid dust and other pollution.

[0030] However, the bonding strength between the transparent patch and the explosion-proof valve is low and is easy to fall off, thereby causing missing bonding and losing the anti-fouling effect on the explosion-proof valve.

[0031] Furthermore, the patch is usually a transparent and colorless structure, and the CCD machine recognition is low, and it is impossible to identify whether the patch has been affixed to the battery end cover, which may easily cause the risk of missing the patch. Among them, CCD refers to the charge coupled device (Charge coupled Device), also known as an image sensor, which is a semiconductor device that can convert optical images into digital signals.

[0032] In order to alleviate the above technical problems, the utility model provides a battery end cover structure and a battery. Figures 1 to 4The embodiments of the present utility model are described in detail.

[0033] First, refer to Figure 1 and Figure 2 The utility model provides a battery end cover structure 100, including a cover plate 110, a patch 120 and a double-sided adhesive strip 130. The cover plate 110 is provided with an explosion-proof valve 111; the patch 120 is located on the outer side of the cover plate 110 and covers the explosion-proof valve 111; the double-sided adhesive strip 130 is bonded between the cover plate 110 and the patch 120, and the double-sided adhesive strip 130 extends along the edge of the patch 120.

[0034] Specifically, in the battery end cover structure 100 of the present solution, a double-sided adhesive strip 130 is bonded between the cover plate 110 and the patch 120, so that the patch 120 is more firmly attached to the explosion-proof valve 111 and is not easy to fall off, thereby playing the role of preventing the explosion-proof valve 111 from being contaminated. In addition, the double-sided adhesive strip 130 extends along the edge of the patch 120 to increase the sealing performance and ensure the anti-contamination effect.

[0035] More specifically, the explosion-proof valve 111 can be disposed on the cover plate 110 by laser welding. The cover plate 110 is further provided with positive and negative poles 112 , which are electrically connected to the positive and negative pole ears of the pole group.

[0036] It should be noted that the thickness of the double-sided adhesive strip 130 is generally smaller than the thickness of the patch 120 , so as to ensure that the patch 120 does not bulge too much, thereby occupying a certain amount of space.

[0037] Furthermore, the material of the patch 120 can be but is not limited to PP, PE and PET, preferably PET; the thickness of the patch 120 is 0.1mm to 0.2mm, preferably 0.1mm; the peel strength of the double-sided tape 130 is 15N / in to 20N / in; the thickness of the double-sided tape 130 is 0.05mm to 0.15mm, preferably 0.08mm.

[0038] In some embodiments, reference Figure 4 The patch 120 overlaps with the edge of the air vent 1111 of the explosion-proof valve 111 , and the overlapping distance is less than or equal to the width of the double-sided adhesive strip 130 .

[0039] Specifically, in this solution, the patch 120 overlaps with the edge of the air vent 1111 of the explosion-proof valve 111, and the overlapping distance is less than or equal to the width of the double-sided tape 130, so that the double-sided tape 130 completely covers the overlapping area, thereby increasing the bonding strength between the patch 120 and the cover plate 110.

[0040] More specifically, the air vent 1111 of the explosion-proof valve 111 can be a waist hole, and the patch 120 has the same shape as the air vent 1111 , except that the patch 120 is slightly larger than the air vent 1111 , so that it overlaps the edge of the air vent 1111 .

[0041] Furthermore, the outer edge of the double-sided tape 130 is aligned with the edge of the patch 120, and the width of the double-sided tape 130 is preferably twice the overlap distance, that is, after the patch 120 is attached to the air vent 1111, the outer half of the double-sided tape 130 is respectively bonded to the patch 120 and the cover plate 110, and the inner half is only bonded to the patch 120.

[0042] In some embodiments, reference Figure 4 A notch 121 is provided at the edge of the patch 120 , and the distance that the notch 121 extends radially along the patch 120 is greater than the overlapping distance between the patch 120 and the edge of the vent 1111 , that is, the depth of the notch 121 is greater than the overlapping distance between the patch 120 and the edge of the vent 1111 .

[0043] Specifically, in this solution, a notch 121 is provided at the edge of the patch 120, and the depth of the notch 121 is greater than the overlap distance between the patch 120 and the edge of the vent 1111. The notch 121 facilitates ventilation of the explosion-proof valve 111, thereby preventing the patch 120 from blocking the explosion-proof valve 111 from opening for ventilation.

[0044] In some embodiments, reference Figure 3 , there are at least two notches 121 , and the double-sided adhesive strip 130 has at least two sections; a gap 131 is formed between two adjacent sections of the double-sided adhesive strip 130 , the gap 131 corresponds to the notch 121 , and the width of the gap 131 is greater than or equal to the width of the notch 121 .

[0045] Specifically, in the present embodiment, there are at least two notches 121, and the double-sided adhesive strip 130 has at least two sections; a gap 131 is formed between two adjacent sections of the double-sided adhesive strip 130, the gap 131 corresponds to the notch 121, and the width of the gap 131 is greater than or equal to the width of the notch 121; multiple notches 121 further facilitate ventilation of the explosion-proof valve 111, and gaps 131 are formed correspondingly between multiple sections of the double-sided adhesive strip 130 at the notch 121, forming an avoidance structure to prevent the double-sided adhesive strip 130 from blocking the notch 121.

[0046] In some embodiments, reference Figure 4 The overlap distance between the patch 120 and the edge of the ventilation opening 1111 is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip 130 is 1.5 mm to 3 mm.

[0047] In some embodiments, reference Figure 4The ratio of the distance along which the notch extends radially of the patch to the length of the patch is in the range of 1:8 to 1:25; specifically, the depth of the notch 121 is in the range of 2 mm to 5 mm.

[0048] In some embodiments, reference Figure 4 , the width of the notch 121 is 1 mm to 4 mm, and / or the width of the gap 131 is 2 mm to 10 mm.

[0049] Specifically, assuming that the overlap distance is e, the width of the double-sided tape 130 is c, the depth of the notch 121 is a1, the width of the notch 121 is a2, the gap 131 is d, the width of the patch 120 is a, the width of the vent 1111 is A, and the distance between the inner edges of the upper and lower double-sided tape 130 is b, then c = (ab) / 2, d = (a-A) / 2.

[0050] Preferably, a is 23.6 mm, b is 20.6 mm, c is 2 mm, d is 8 mm, A is 20.6 mm, e is 1.5 mm, a1 is 3 mm, and a2 is 3 mm.

[0051] If the value of e is too small, the bonding strength of the patch 120 is low; if the value of e is too large, the production cost is increased. In addition, a1 and a2 should not be too large to avoid external dust intrusion and electrolyte spillage during injection, which may cause the explosion-proof valve 111 to fail.

[0052] In some embodiments, the patch 120 is made of a colorless transparent material, and the double-sided adhesive strip 130 is a fluorescent adhesive film.

[0053] Specifically, this solution is a specific implementation method for improving the CCD recognition accuracy of the machine and reducing the risk of missing the patch 120 of the explosion-proof valve 111.

[0054] In some embodiments, the patch 120 is made of a colorless transparent material, and the double-sided adhesive strip 130 is a colored adhesive film.

[0055] Specifically, this solution is another specific implementation method for improving the CCD recognition accuracy of the machine and reducing the risk of missing the patch 120 of the explosion-proof valve 111.

[0056] More specifically, the double-sided adhesive strip 130 is in a color that is easily recognizable, such as blue, green, or red.

[0057] For ease of understanding, it is further explained that the patch 120 is usually a transparent and colorless structure, and the machine CCD has low recognition and cannot identify whether the battery end cover has been affixed with the patch 120, which may easily cause the risk of missing it; wherein, CCD refers to a charge coupled device (Charge coupled Device), also known as a CCD image sensor, which is a semiconductor device that can convert optical images into digital signals.

[0058] Secondly, the utility model further provides a battery, including a battery housing, a pole group arranged inside the battery housing, and a battery end cover structure 100, wherein the battery end cover structure 100 covers the opening of the battery housing.

[0059] Specifically, the battery in this solution includes a battery end cover structure 100, so the battery has all the beneficial effects of the battery end cover structure 100. In addition, the battery in this solution also includes other components such as a battery protection board, and only the components related to this solution are listed here, but it does not limit the composition of the battery.

[0060] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery end cover structure, characterized in that: include: Cover plate, equipped with explosion-proof valve; A patch, located on the outer side of the cover plate and covering the explosion-proof valve; A double-sided adhesive strip is bonded between the cover plate and the patch, and the double-sided adhesive strip extends along the edge of the patch.

2. The battery end cover structure according to claim 1, characterized in that: The patch overlaps with the edge of the air vent of the explosion-proof valve, and the overlapping distance is less than or equal to the width of the double-sided adhesive strip.

3. The battery end cover structure according to claim 2, characterized in that: A notch is provided at the edge of the patch, and a distance that the notch extends radially along the patch is greater than a distance that overlaps the patch and the edge of the vent.

4. The battery end cover structure according to claim 3, characterized in that: The notches have at least two, and the double-sided adhesive strip has at least two sections; A gap is formed between two adjacent sections of the double-sided adhesive strips, the gap corresponds to the notch, and the width of the gap is greater than or equal to the width of the notch.

5. The battery end cover structure according to claim 2, characterized in that: The overlap distance between the patch and the edge of the ventilation opening is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip is 1.5 mm to 3 mm.

6. The battery end cover structure according to claim 3, characterized in that: The ratio of the distance that the notch extends along the radial direction of the patch to the length of the patch is in a range of 1:8 to 1:

25.

7. The battery end cover structure according to claim 4, characterized in that: The width of the notch is 1 mm to 4 mm, and / or the width of the gap is 2 mm to 10 mm.

8. The battery end cover structure according to any one of claims 1 to 7, characterized in that: The patch is made of colorless and transparent material, and the double-sided adhesive strip is a fluorescent adhesive film.

9. The battery end cover structure according to any one of claims 1 to 7, characterized in that: The patch is made of colorless and transparent material, and the double-sided adhesive strip is a colored adhesive film.

10. A battery, characterized in that: The invention comprises a battery shell, a pole group arranged inside the battery shell, and a battery end cover structure according to any one of claims 1 to 9, wherein the battery end cover structure covers an opening of the battery shell.

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