Explosion-proof valve patch, cover plate assembly and battery cell

Abstract

The invention provides an anti-explosion valve patch, a cover plate assembly and a battery cell, and belongs to the technical field of batteries, the anti-explosion valve patch comprises a main body part and an edge part, and the edge part is used for being connected with a battery cell cover plate; the explosion-proof valve patch is provided with a gap, the gap comprises a liquid inlet part penetrating through the edge part and a communication part penetrating through the main body part, the communication part is used for communicating the explosion-proof valve mounting hole with the outside of the battery cell cover plate, and the liquid inlet part and the communication part form a liquid inlet channel for overflowing electrolyte to flow into the explosion-proof valve mounting hole. According to the explosion-proof valve patch, the pressure difference between the explosion-proof valve mounting hole and the outside of the battery cell cover plate is balanced through the communicating part of the notch, deformation of the explosion-proof valve is prevented, and the liquid inlet channel is formed through the liquid inlet part and the communicating part, so that overflowed electrolyte in the electrolyte injection process can flow into the explosion-proof valve mounting hole through the liquid inlet channel, and the explosion-proof valve is prevented from being damaged. And the problem that the electrolyte pollutes the information identification code is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an explosion-proof valve patch, a cover plate assembly and a battery cell. Background Art

[0002] The explosion-proof valve patch is typically installed on the outside of the battery cover, covering the explosion-proof valve mounting hole. Located on the outside of the explosion-proof valve, the explosion-proof valve patch allows for ventilation while also preventing foreign matter from entering the explosion-proof valve. Traditional explosion-proof valve patches primarily feature slits to facilitate exhaust and external communication.

[0003] During the process of pre-charging the electrolyte in the battery cell, a small amount of electrolyte will flow out. The explosion-proof valve installation hole is set close to the injection hole, and the electrolyte can easily flow into the opening and remain in the opening and in the gap between the explosion-proof valve patches and the battery cover on both sides of the opening.

[0004] When the battery cell is at high temperature, the electrolyte remaining in the open valve area will be blown out by the airflow from the explosion-proof valve, thereby contaminating the battery cell cover, especially the information identification code (such as a QR code) on the battery cell cover. In addition, an unreasonable slit structure design can easily lead to insufficient exhaust capacity, making the explosion-proof valve prone to deformation during battery cell gas production, and the explosion pressure of the explosion-proof valve unstable, which can seriously lead to the failure of the battery cell safety protection. Summary of the Invention

[0005] In view of this, the present invention aims to provide an explosion-proof valve patch to help balance the pressure difference between the explosion-proof valve installation hole and the outside, and to prevent the electrolyte from contaminating the information identification code.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows: An explosion-proof valve patch, covering the outside of the explosion-proof valve mounting hole of the battery cover, wherein the explosion-proof valve mounting hole is located between the injection hole and the information identification code, the explosion-proof valve patch comprising a main portion adapted to be provided with the explosion-proof valve mounting hole, and an edge portion provided along the periphery of the main portion, the edge portion being used to connect to the battery cover; A notch is provided on the explosion-proof valve patch, and the notch includes a liquid inlet portion set through the edge portion, and a connecting portion connected to the liquid inlet portion and set through the main body portion, and the connecting portion connects the explosion-proof valve mounting hole and the outside of the battery cover plate. The liquid inlet portion and the connecting portion are connected to form a liquid inlet channel, and the liquid inlet channel is used to supply overflow electrolyte to flow into the explosion-proof valve mounting hole.

[0007] Furthermore, a distance a between a first side wall of the communicating portion away from the liquid inlet portion and an outer contour of the main body portion satisfies: 2 mm ≤ a ≤ 25 mm.

[0008] Furthermore, the communication portion and the liquid inlet portion each have two second side walls arranged opposite to each other; The distance b between the two second side walls satisfies: 2 mm ≤ b ≤ 30 mm.

[0009] Furthermore, a plurality of notches are provided on the edge of the explosion-proof valve patch.

[0010] Furthermore, the edge portion has a first section disposed toward the liquid injection hole, a second section disposed opposite to the first section, and a third section connected between the same ends of the first section and the second section; The notch is provided in the middle of the second section and / or the middle of the third section.

[0011] Furthermore, the thickness d of the explosion-proof valve patch satisfies: 0.05mm≤d≤10mm.

[0012] Furthermore, the notch is in a "U" shape or a quasi-"U" shape.

[0013] Furthermore, the explosion-proof valve patch is in any one of the shapes of oblong, circular, rectangular, elliptical or square.

[0014] Compared with the prior art, the present invention has the following advantages: The explosion-proof valve patch described in the present invention connects the explosion-proof valve mounting hole with the outside through the communicating part of the notch, which is beneficial to balancing the pressure difference between the explosion-proof valve mounting hole and the outside of the battery cover, thereby preventing the deformation of the explosion-proof valve and ensuring the performance of the explosion-proof valve. The liquid inlet part and the communicating part form a liquid inlet channel, so that the electrolyte overflowing during the electrolyte injection process can flow into the explosion-proof valve mounting hole through the liquid inlet channel, which is beneficial to solving the problem that electrolyte is easily retained at the traditional slit, and the retained electrolyte flows out again when the battery cell is left at high temperature and contaminates the information identification code. Since the overflow amount of electrolyte is small, even if it enters the explosion-proof valve mounting hole, the contamination of the explosion-proof valve is within the allowable range, which is beneficial to ensuring the performance of the explosion-proof valve.

[0015] In addition, the setting of the spacing range between the first side wall and the outer contour of the main body helps prevent the poor pressure balancing and electrolyte inflow effect of the connecting part due to too small a spacing, and prevents foreign matter from easily entering the explosion-proof valve mounting hole due to too large a spacing. The setting of the spacing range between the two second side walls helps ensure the flow of electrolyte in the connecting part and the liquid inlet part, and helps ensure the exhaust effect of the connecting part. When the spacing b is small, the liquid inlet channel is relatively narrow, which not only affects the efficiency of the electrolyte flowing into the explosion-proof valve mounting hole, but also affects the pressure balancing effect of the connecting part. When the spacing b is too large, foreign matter can easily enter the explosion-proof valve mounting hole, thereby affecting the use effect of the explosion-proof valve.

[0016] In addition, by providing multiple notches, the electrolyte can flow more evenly into the explosion-proof valve mounting hole from different positions. Even if one of the notches fails to function properly due to unexpected circumstances (such as being blocked by impurities, local deformation, etc.), the other notches can still continue to take on the task of guiding the electrolyte into the explosion-proof valve mounting hole, thereby ensuring the performance and reliability of the notches and reducing the potential safety hazards of the battery cells caused by failures in the liquid inlet channel. The notches are set in the middle of the second and third sections because, during the injection process, the electrolyte may flow irregularly due to the notch being too close to the injection hole, causing the electrolyte to flow along the edge of the explosion-proof valve patch and then flow into the notch. This helps ensure that the electrolyte overflowing during the injection process can flow smoothly into the explosion-proof valve mounting hole in the expected path and manner, thereby preventing the electrolyte from contaminating the information identification code.

[0017] Furthermore, the thickness range of the explosion-proof valve patch helps ensure its excellent mechanical properties. The U-shaped or quasi-U-shaped notch is easy to process and form, and provides excellent performance. The explosion-proof valve patch can be in any of the following shapes: oblong, circular, rectangular, oval, or square, and can be selected based on the specifications of the explosion-proof valve mounting hole, providing great flexibility.

[0018] In addition, another object of the present invention is to propose a cover assembly, including a battery cell cover, wherein the battery cell cover is provided with an injection hole and an information identification code, and an explosion-proof valve mounting hole located between the injection hole and the information identification code, and the outer side of the explosion-proof valve mounting hole is provided with the explosion-proof valve patch as described above.

[0019] The cover plate assembly of the present invention, by providing the above-mentioned explosion-proof valve patch, is conducive to guiding the overflowing electrolyte into the explosion-proof valve installation hole, thereby preventing the electrolyte from contaminating the explosion-proof valve. At the same time, it is also conducive to exhaust, thereby preventing the explosion-proof valve from deforming.

[0020] Furthermore, the present invention also provides a battery cell, comprising the cover plate assembly as described above.

[0021] The battery cell of the present invention has the same beneficial effects as the above-mentioned cover plate assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic structural diagram of the explosion-proof valve patch according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the partial structure of the explosion-proof valve patch at the notch according to the first embodiment of the present invention; Figure 3 This is a schematic structural diagram of the explosion-proof valve patch according to the first embodiment of the present invention in use; Figure 4 for Figure 3 Sectional view at AA in the figure.

[0023] Description of reference numerals: 1. Explosion-proof valve patch; 2. Battery cover; 101, main body; 102, edge portion; 1021, first section; 1022, second section; 1023, third section; 103, notch; 1031, connecting portion; 1032, liquid inlet portion; 1033, first side wall; 1034, second side wall; 201. Liquid injection hole; 202. Information identification code; 203. Explosion-proof valve installation hole. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be noted that if terms such as "upper," "lower," "inner," and "back" appear, they are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] Example 1 This embodiment relates to an explosion-proof valve patch 1, which covers the outside of the explosion-proof valve mounting hole 203 of the battery cover 2, with the explosion-proof valve mounting hole 203 located between the injection hole 201 and the information identification code 202. This invention aims to address the problem of the unreasonable structural design of the explosion-proof valve patch 1 in the prior art, which causes overflowing electrolyte during the electrolyte injection process to easily contaminate the information identification code 202 on the battery cover 2. It also helps to solve the problem of a large pressure difference between the explosion-proof valve mounting hole 203 and the outside of the battery cover 2.

[0028] In terms of overall structure, the explosion-proof valve patch 1 described in this embodiment comprises a main portion 101 adapted to fit within the explosion-proof valve mounting hole 203, and an edge portion 102 disposed along the periphery of the main portion 101. The edge portion 102 is configured to connect to the battery cell cover 2. The explosion-proof valve patch 1 is provided with a notch 103. This notch 103 includes a liquid inlet portion 1032 extending through the edge portion 102, and a connecting portion 1031 extending through the main portion 101 and communicating with the liquid inlet portion 1032. The connecting portion 1031 connects the explosion-proof valve mounting hole 203 with the exterior of the battery cell cover 2. The liquid inlet portion 1032 and the connecting portion 1031 form a liquid inlet channel for allowing overflow electrolyte to flow into the explosion-proof valve mounting hole 203.

[0029] The explosion-proof valve patch 1 described in this embodiment connects the explosion-proof valve mounting hole 203 with the outside through the connecting portion 1031 of the notch 103, which helps balance the pressure difference between the explosion-proof valve mounting hole 203 and the outside of the battery cover 2, thereby preventing deformation of the explosion-proof valve and ensuring the performance of the explosion-proof valve. Furthermore, the liquid inlet portion 1032 and the connecting portion 1031 form a liquid inlet channel, allowing electrolyte overflow during electrolyte injection to flow into the explosion-proof valve mounting hole 203 through the liquid inlet channel. This helps solve the problem of electrolyte easily being retained in traditional slits, and the retained electrolyte flowing out again when the battery cell is left at high temperature and contaminating the information identification code 202. In addition, because the amount of electrolyte overflow is small, even if it enters the explosion-proof valve mounting hole 203, the contamination of the explosion-proof valve is within an acceptable range, thereby ensuring the performance of the explosion-proof valve.

[0030] Based on the overall introduction above, an exemplary structure of the explosion-proof valve patch 1 shown in this embodiment is as follows Figures 1 to 4 As shown in , the main body 101 is adapted to the explosion-proof valve installation hole 203, which means that the projection of the outer contour of the explosion-proof valve installation hole 203 and the main body 101 in the thickness direction of the battery cover 2 completely overlaps, that is, the shape and size of the main body 101 are completely consistent with the shape and specifications of the explosion-proof valve installation hole 203. The outer contour and inner contour of the edge portion 102 are the same as the outer contour of the main body 101. The dividing line between the edge portion 102 and the main body 101 is as shown in FIG. Figure 1 As shown by the dotted line in .

[0031] In practice, the edge portion 102 of this embodiment is bonded to the outer side of the cell cover 2. An adhesive layer is provided on the side of the edge portion 102 facing the cell cover 2, through which the explosion-proof valve patch 1 is connected. It should be noted that an adhesive layer is not required at the location corresponding to the notch 103 to ensure that the electrolyte can flow into the notch 103 and into the explosion-proof valve mounting hole 203.

[0032] The explosion-proof valve installation hole 203 in this embodiment is Figure 1 In the oblong shape shown in FIG, the main body portion 101 is also oblong, and the outer and inner contours of the edge portion 102 are also oblong. Of course, the explosion-proof valve patch 1 can also be circular, rectangular, or square to adapt to explosion-proof valve mounting holes 203 of different shapes, thereby having better flexibility and meeting the use requirements of protecting the explosion-proof valve.

[0033] As a preferred embodiment, Figure 1 and Figure 2 As shown in FIG, the notch 103 in this embodiment is U-shaped. The connecting portion 1031 has a first sidewall 1033 disposed away from the connecting portion 10312. The connecting portion 1031 and the liquid inlet portion 1032 each have two second sidewalls 1034 disposed opposite each other. The two oppositely disposed second sidewalls 1034 are arranged parallel or nearly parallel. The first sidewall 1033 is connected to the second sidewalls 1034 on both sides, giving the notch 103 a U-shape. The U-shape of the notch 103 here has the advantages of a simple structure and ease of processing and forming.

[0034] As a preferred embodiment, Figure 1 As shown in , the spacing a between the first side wall 1033 and the outer contour of the main body 101 satisfies the following: 2mm≤a≤25mm. The setting of the spacing range between the first side wall 1033 and the outer contour of the main body 101 helps prevent poor pressure balancing and electrolyte inflow in the connecting portion 1031 due to a spacing less than 2mm, and prevents foreign matter from easily entering the explosion-proof valve mounting hole 203 due to a spacing greater than 25mm. In a specific implementation, the spacing a between the first side wall 1033 and the outer contour of the main body 101 can be, for example, 2mm, 2.5mm, 3.5mm, 4mm, 5mm, 10mm, 15mm, 18mm, 20mm, 22mm, 24mm, or 25mm.

[0035] In addition, still referring to the figure, the distance b between the two second side walls 1034 satisfies: 2mm≤b≤30mm. In specific implementation, the distance b can be, for example, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 18mm, 25mm, or 30mm.

[0036] Here, the spacing between the two second sidewalls 1034 is designed to ensure the flow of electrolyte within the connecting portion 1031 and the liquid inlet portion 1032, and to ensure the exhaust efficiency of the connecting portion 1031. When the spacing b is less than 2 mm, the liquid inlet channel is relatively narrow, which not only affects the efficiency of the electrolyte flowing into the explosion-proof valve mounting hole 203, but also makes it easy for the electrolyte to remain in the liquid inlet portion 1032 and be unable to flow into the explosion-proof valve mounting hole 203. At the same time, it also affects the pressure balancing effect of the connecting portion 1031, making the explosion-proof valve prone to deformation during use, thereby affecting the performance of the explosion-proof valve. When the spacing b is greater than 30 mm, foreign matter can easily enter the explosion-proof valve mounting hole 203, further affecting the performance of the explosion-proof valve.

[0037] Table 1:

[0038] The spacings a and b in Examples 1 through 8 are all within their respective reasonable numerical ranges. At this point, the electrolyte can flow through the gap 103 into the explosion-proof valve mounting hole 203, and the contamination rate of the explosion-proof valve is less than 1%, thus not affecting the performance of the explosion-proof valve. Furthermore, because the electrolyte flows into the explosion-proof valve mounting hole 203, when the battery cell is at high temperature and is left standing, the electrolyte cannot flow out of the explosion-proof valve mounting hole 203 and contaminate the information identification code 202.

[0039] In addition, foreign matter is not easy to enter the explosion-proof valve mounting hole 203. Even if a small amount of tiny foreign matter enters the explosion-proof valve mounting hole 203, it will not affect the performance of the explosion-proof valve. The connecting part 1031 has a good connection effect with the outside, so that the explosion-proof valve will not be deformed due to the pressure difference between the inside and outside of the explosion-proof valve mounting hole 203, which is conducive to ensuring the performance of the explosion-proof valve and making the performance of the explosion-proof valve patch 1 qualified.

[0040] In comparative example 1, the value of spacing a is lower than the lower limit of reasonable spacing a, and the value of spacing b is within the range of reasonable spacing b. Due to the small specifications of the connecting part 1031, the pressure difference problem between the explosion-proof valve mounting hole 203 and the outside is not significantly improved, and the explosion-proof valve may be deformed during use.

[0041] At the same time, the electrolyte has difficulty flowing into the liquid inlet portion 1032 and instead remains near the liquid inlet portion 1032 or flows directly toward the information identification code 202. Furthermore, when the battery cell is left at high temperatures, the electrolyte in the liquid inlet portion 1032 will still contaminate the information identification code 202. The adhesion strength of the explosion-proof valve patch 1 does not meet the requirements. Therefore, the explosion-proof valve patch 1 in Comparative Example 1 fails.

[0042] In Comparative Examples 2 and 3, spacing a exceeds the upper limit of the reasonable numerical range of spacing a, while spacing b is within the reasonable range. At this point, because connecting portion 1031 helps improve the pressure difference between explosion-proof valve mounting hole 203 and the outside, the explosion-proof valve is less likely to deform during use, and the electrolyte can still flow into explosion-proof valve mounting hole 203 through the liquid inlet channel, and the explosion-proof valve contamination rate is less than 1%. However, due to the large size of connecting portion 1031, the bonding strength of explosion-proof valve patch 1 cannot meet the requirements. Therefore, explosion-proof valve patch 1 in Comparative Example 3 fails to meet the requirements.

[0043] In Comparative Example 4, spacing a is within the reasonable range, while spacing b exceeds the upper limit of this range. This results in a larger size for liquid inlet 1032, allowing electrolyte to flow through liquid inlet 1032 into connecting portion 1031. However, this results in a contamination rate of the explosion-proof valve exceeding 1%. Furthermore, the adhesive strength of explosion-proof valve patch 1 does not meet the requirements, and therefore explosion-proof valve patch 1 in Comparative Example 4 fails to meet the standard.

[0044] In Comparative Examples 5 and 6, both spacing a and spacing b are at relatively low values. At this point, the electrolyte remains in and around the liquid inlet 1032 and cannot flow into the explosion-proof valve mounting hole 203. When the battery cell is left at high temperature, the electrolyte is still easily blown out of the liquid inlet 1032 and flows toward the information identification code 202, contaminating the information identification code 202. Because the connecting portion 1031 helps improve the pressure difference between the explosion-proof valve mounting hole 203 and the outside, the explosion-proof valve does not deform. Although the bonding strength of the explosion-proof valve patch 1 meets the requirements, overall, the explosion-proof valve patches 1 in Comparative Examples 5 and 6 fail to meet the requirements.

[0045] In this embodiment, only when the spacing a is set at 2mm≤a≤30mm and the spacing b is set at 2mm≤b≤20mm can the electrolyte flow through the gap 103 into the explosion-proof valve mounting hole 203 without contaminating the information identification code 202. Even when the battery cell is at a high temperature, the electrolyte will not contaminate the information identification code 202. Reasonable spacing a and reasonable spacing b also help to ensure that the pressure difference problem is solved, making it difficult for the explosion-proof valve to deform, and making it difficult for foreign matter to enter the explosion-proof valve mounting hole 203 and block the liquid inlet channel, thereby making the explosion-proof valve patch 1 have higher performance.

[0046] Furthermore, it should be noted that the notch 103 described in this embodiment may be quasi-U-shaped, in addition to being U-shaped. In this case, the two opposing second sidewalls 1034 of the notch 103 are not parallel to each other. In specific implementations, the quasi-U-shaped shape may be an arc, a trapezoid, or a semi-ellipse. In this case, the notch 103 also has good liquid-guiding and ventilation effects and is easy to process and shape.

[0047] As a preferred embodiment, the edge of the explosion-proof valve patch 1 is provided with multiple notches 103. By providing multiple notches 103, the electrolyte can flow more evenly into the explosion-proof valve mounting hole 203 from different locations. Even if one of the notches 103 fails to function properly due to unexpected circumstances (such as being clogged by impurities or being partially deformed), the other notches 103 can still continue to guide the electrolyte into the explosion-proof valve mounting hole 203, thereby ensuring the performance and reliability of the notches 103 and reducing potential safety hazards to the battery cells caused by failures in the liquid inlet channel.

[0048] In addition, if Figure 3 As shown in the figure, the edge portion 102 has a first section 1021 arranged toward the injection hole 201, a second section 1022 arranged opposite to the first section 1021, and a third section 1023 connected between the same ends of the first section 1021 and the second section 1022. The notch 103 is arranged in the middle of the second section 1022 and / or the middle of the third section 1023. Here, the notch 103 is arranged in the middle of the second section 1022 and the third section 1023 to take into account that during the injection process, the electrolyte may flow irregularly due to the position of the notch 103 being too close to the injection hole 201, causing the electrolyte to flow along the edge of the explosion-proof valve patch 1 and then flow into the notch 103, which is conducive to ensuring that the electrolyte overflowing during the injection process can flow smoothly into the explosion-proof valve mounting hole 203 in the expected path and manner, thereby preventing the electrolyte from contaminating the information identification code 202.

[0049] In this embodiment, by providing the notches 103 in the middle of the second section 1022 and the middle of the third section 1023, any electrolyte overflowing from the injection hole 201 flows along the edge portion 102. Once the electrolyte reaches the notch 103, it flows through the liquid inlet portion 1032 and the connecting portion 1031 into the explosion-proof valve mounting hole 203. When the battery cell is at a high temperature and is stationary, the electrolyte in the explosion-proof valve mounting hole 203 cannot flow out again, thereby preventing contamination of the information identification code 202 and thereby ensuring the effectiveness of the information identification code 202. The information identification code 202 herein may be, for example, a QR code or barcode storing the battery cell information.

[0050] The explosion-proof valve patch 1 in this embodiment can be made of the same material as the explosion-proof valve patch 1 in the prior art, for example, a material having air permeability, so that the connecting portion 1031 of the notch 103 and the air vents of the explosion-proof valve patch 1 cooperate to improve the balancing effect of the pressure difference between the explosion-proof valve mounting hole 203 and the outside of the battery cover 2.

[0051] In addition, the thickness d of the explosion-proof valve patch 1 satisfies the following conditions: 0.05 mm ≤ d ≤ 10 mm. This helps ensure that the explosion-proof valve patch 1 has good mechanical properties and reduces production costs. This prevents deformation of the explosion-proof valve patch 1 due to a thickness d less than 0.05 mm, which could affect its stability in use, and helps prevent the high cost associated with a thickness d greater than 10 mm. In specific implementations, the thickness d of the explosion-proof valve patch 1 can be, for example, 0.05 mm, 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 9 mm, or 10 mm.

[0052] The explosion-proof valve patch 1 described in this embodiment, by optimizing the notch 103 and making the notch 103 have a liquid inlet portion 1032 and a connecting portion 1031, is conducive to preventing the explosion-proof valve from being deformed due to pressure difference problems, and is also conducive to guiding the electrolyte overflowing during the electrolyte injection process to flow into the explosion-proof valve mounting hole 103, thereby preventing the electrolyte from contaminating the information identification code 202, and further helping to improve the performance of the explosion-proof valve patch 1 and the explosion-proof valve.

[0053] Example 2 This embodiment relates to a cover plate assembly, such as Figure 3 and Figure 4 As shown in , the cover assembly includes a battery cell cover 2, which is provided with a liquid injection hole 201 and an information identification code 202, and an explosion-proof valve mounting hole 203 located between the liquid injection hole 201 and the information identification code 202, and the outer side of the explosion-proof valve mounting hole 203 is provided with the explosion-proof valve patch 1 in Example 1.

[0054] The cover plate assembly described in this embodiment, by providing the above-mentioned explosion-proof valve patch 1, is conducive to guiding the overflowing electrolyte into the explosion-proof valve mounting hole 203, thereby preventing the electrolyte from contaminating the explosion-proof valve. At the same time, it is also conducive to exhaust, thereby preventing the explosion-proof valve from deforming.

[0055] In addition, this embodiment also relates to a battery cell, including the cover plate assembly as described above.

[0056] The battery cell described in this embodiment has the same beneficial effects as the above-mentioned cover plate assembly, which will not be described in detail here.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosion-proof valve patch, covering the outside of an explosion-proof valve mounting hole (203) of a battery cover (2), wherein the explosion-proof valve mounting hole (203) is located between a liquid injection hole (201) and an information identification code (202), characterized in that: The explosion-proof valve patch (1) comprises a main body portion (101) adapted to be arranged in the explosion-proof valve mounting hole (203), and an edge portion (102) arranged along the periphery of the main body portion (101), wherein the edge portion (102) is used to be connected to the battery cover plate (2); The explosion-proof valve patch (1) is provided with a notch (103), the notch (103) comprising a liquid inlet portion (1032) provided through the edge portion (102), and a communicating portion (1031) communicating with the liquid inlet portion (1032) and provided through the main body portion (101), wherein the communicating portion (1031) is connected to the explosion-proof valve mounting hole (203) and the outside of the battery cover (2), the liquid inlet portion (1032) and the communicating portion (1031) being connected to form a liquid inlet channel, and the liquid inlet channel is used for allowing overflow electrolyte to flow into the explosion-proof valve mounting hole (203).

2. The explosion-proof valve patch according to claim 1, characterized in that: The spacing a between the first side wall (1033) of the communication portion (1031) away from the liquid inlet portion (1032) and the outer contour of the main body portion (101) satisfies the following: 2mm≤a≤25mm.

3. The explosion-proof valve patch according to claim 1, characterized in that: The communication portion (1031) and the liquid inlet portion (1032) both have two second side walls (1034) arranged opposite to each other; The spacing b between the two second side walls (1034) satisfies: 2mm≤b≤30mm.

4. The explosion-proof valve patch according to claim 1, characterized in that: The edge of the explosion-proof valve patch (1) is provided with a plurality of notches (103).

5. The explosion-proof valve patch according to claim 1, characterized in that: The edge portion (102) comprises a first section (1021) disposed toward the liquid injection hole (201), a second section (1022) disposed opposite to the first section (1021), and a third section (1023) connected between the same ends of the first section (1021) and the second section (1022); The notch (103) is provided in the middle of the second section (1022) and / or the middle of the third section (1023).

6. The explosion-proof valve patch according to claim 1, characterized in that: The thickness d of the explosion-proof valve patch (1) satisfies: 0.05 mm ≤ d ≤ 10 mm.

7. The explosion-proof valve patch according to claim 1, characterized in that: The notch (103) is in a "U" shape or a "U"-like shape.

8. The explosion-proof valve patch according to any one of claims 1 to 7, characterized in that: The explosion-proof valve patch (1) is in any of the following shapes: oblong, circular, rectangular, elliptical or square.

9. A cover plate assembly, characterized in that: The invention comprises a cell cover plate (2), wherein the cell cover plate (2) is provided with a liquid injection hole (201) and an information identification code (202), and an explosion-proof valve installation hole (203) located between the liquid injection hole (201) and the information identification code (202), and an explosion-proof valve patch (1) according to any one of claims 1 to 8 is provided on the outside of the explosion-proof valve installation hole (203).

10. A battery cell, characterized in that: The invention comprises the cover plate assembly according to claim 9.

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