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 matched with an anti-explosion valve mounting hole and an edge part arranged along the periphery of the main body part, and one side, facing a battery cell cover plate, of the edge part is provided with a non-adhesive area and a connecting area with an adhesive layer; the edge part is connected with the battery cell cover plate through a glue layer, a communication channel is defined by the glue-free area, the glue layer and the battery cell cover plate, and the communication channel is used for communicating the explosion-proof valve mounting hole with the exterior of the battery cell cover plate and guiding overflowing electrolyte to flow into the explosion-proof valve mounting hole. According to the explosion-proof valve patch, the non-adhesive area on the edge part, the adhesive layer and the battery cell cover plate define the communication channel, and the communication channel not only facilitates air pressure balance between the explosion-proof valve mounting hole and the outside, but also facilitates prevention of deformation of the explosion-proof valve, and also facilitates prevention of an electrolyte from polluting an information identification code.

Description

Technical Field

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

[0002] The explosion-proof valve patch is arranged outside the explosion-proof valve mounting hole of the electric core cover plate and is used to cover the explosion-proof valve mounting hole to protect the explosion-proof valve in the explosion-proof valve mounting hole. The explosion-proof valve patch is generally made of a material with a ventilation effect. The explosion-proof valve mounting hole can be connected to the outside through the ventilation structure of the explosion-proof valve patch itself. In the prior art, a slotted structure is also provided on the explosion-proof valve patch to reduce the pressure difference between the inside and outside of the explosion-proof valve.

[0003] Considering that the explosion-proof valve mounting hole is generally located between the liquid injection hole and the information identification code (such as a two-dimensional code) on the electric core cover plate, during the process of injecting electrolyte into the liquid injection hole, the overflowing electrolyte will flow to the information identification code after flowing through the edge of the explosion-proof valve patch, thus contaminating the information identification code. In addition, only setting a slotted structure on the explosion-proof valve patch has a poor improvement effect on the pressure difference problem, resulting in a large deformation risk during the use of the explosion-proof valve. Summary of the Invention

[0004] In view of this, the present invention aims to provide an explosion-proof valve patch to prevent the overflowing electrolyte from being contaminated.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows: An explosion-proof valve patch covers the outside of the explosion-proof valve mounting hole of the electric core cover plate and is located between the liquid injection hole and the information identification code. The explosion-proof valve patch includes a main body part adapted to the explosion-proof valve mounting hole and an edge part arranged along the outer periphery of the main body part. An adhesive-free area and a connection area with an adhesive layer are provided on the side of the edge part facing the electric core cover plate; The edge part is connected to the electric core cover plate through the adhesive layer, and a communication channel is formed among the adhesive-free area, the adhesive layer and the electric core cover plate. The communication channel is used to connect the explosion-proof valve mounting hole and the outside of the electric core cover plate and guide the overflowing electrolyte into the explosion-proof valve mounting hole.

[0006] Further, the flow area S of the communication channel satisfies: 0.5mm 2 ≤S≤60mm 2 .

[0007] Further, the ratio P of the total area M of the adhesive-free area in the thickness direction of the explosion-proof valve patch to the area N of the edge part in the thickness direction of the explosion-proof valve patch satisfies: 0.005≤P≤0.5.

[0008] Further, the edge portion has a first section facing the liquid injection hole, a second section disposed opposite to the first section, and a third section respectively connected between the same ends of the first section and the second section; The glue-free area is provided in the middle of the second section and / or the middle of the third section.

[0009] Further, a plurality of the connection areas are arranged at intervals along the circumferential direction of the edge portion, and the glue-free areas are respectively disposed between the two ends of two adjacent connection areas; or, There is one connection area, and the glue-free area is disposed between the two ends of the connection area.

[0010] Further, the thickness d of the main body portion and the edge portion satisfies: 0.01 mm ≤ d ≤ 8 mm.

[0011] Further, the explosion-proof valve patch is in any one of an oblong shape, a square shape, a rectangular shape, an oval shape or a circular shape.

[0012] Compared with the prior art, the present invention has the following advantages: For the explosion-proof valve patch of the present invention, a communication channel is formed by enclosing between the glue-free area, the glue layer and the cell cover plate on the edge portion. The communication channel not only enables the air pressure between the explosion-proof valve mounting hole and the outside to be balanced. When the pressure in the explosion-proof valve mounting hole increases, the gas can be discharged through the communication channel; when the pressure in the explosion-proof valve mounting hole decreases, the outside gas can enter, which is beneficial to preventing the explosion-proof valve from deforming due to the pressure difference problem. In addition, the overflowing electrolyte can flow into the explosion-proof valve mounting hole through the communication channel. Considering that the amount of the overflowing electrolyte is small, even if it flows into the explosion-proof valve mounting hole, the pollution rate of the explosion-proof valve is within the allowable range, thereby avoiding the electrolyte from polluting the information identification code, and further being beneficial to ensuring the use performance of the information identification portion.

[0013] In addition, the setting of the range of the flow area of the communication channel is beneficial to ensuring the use requirements of ventilation and electrolyte inflow. When the flow area is less than 0.5 mm 2 the ventilation effect is poor, and the electrolyte is not easy to flow into the explosion-proof valve mounting hole; when the flow area is greater than 60 mm 2 the connection effect of the explosion-proof valve patch will be poor, and it is easy for foreign objects to block the communication channel or enter the explosion-proof valve mounting hole. The ratio range of the total area of the glue-free area and the area of the edge area is beneficial to ensuring the pressure difference balance effect of the communication channel, thereby maintaining the pressure balance on both sides of the explosion-proof valve, and further preventing the explosion-proof valve from deforming; when the ratio P is less than 0.005, the ventilation effect of the communication channel cannot be ensured, and the electrolyte cannot be guided into the explosion-proof valve mounting hole. When the ratio P is greater than 0.5, it may cause the explosion-proof valve patch to be not firmly adhered to the cell cover plate.

[0014] In addition, the second and third segments of the glue-free area are arranged in the middle, making the flow path of the electrolyte clearer and smoother, and guiding the overflowing electrolyte to flow into the communication channel, and then into the explosion-proof valve mounting hole, preventing the problem of low inflow of the electrolyte into the communication channel due to the glue-free area being too close to the liquid injection hole. Through multiple connection areas, it is beneficial to form multiple communication channels, thereby improving the ventilation and the inflow efficiency of the electrolyte. And when one communication channel cannot be used, the purpose of balancing the air pressure and guiding the electrolyte to flow in can also be achieved through other communication channels; forming one communication channel through one connection area is also beneficial to meet the usage requirements of ventilation and guiding the electrolyte to flow into the explosion-proof valve mounting hole, and has a simple structure and is easy to process and form. The setting of the thickness range of the main body part and the edge part is beneficial to meet the usage requirements of the explosion-proof valve patch. The setting of the shape of the explosion-proof valve is beneficial to meet the usage requirements of explosion-proof valve mounting holes of different shapes, and has good flexibility.

[0015] In addition, another object of the present invention is to provide a cover plate assembly, including a battery cell cover plate, wherein the battery cell cover plate is provided with a liquid injection hole, an information identification code, and an explosion-proof valve mounting hole located between the liquid injection hole and the information identification code, and an explosion-proof valve patch as described above is arranged outside the explosion-proof valve mounting hole.

[0016] For the cover plate assembly of the present invention, by arranging the explosion-proof valve patch as above, it is beneficial to prevent the explosion-proof valve from deforming and to prevent the information identification code from being contaminated by the overflowing electrolyte, thereby being beneficial to improving the usage performance of the cover plate assembly.

[0017] Furthermore, the present invention also provides a battery cell including the cover plate assembly as described above.

[0018] For the battery cell of the present invention, by arranging the cover plate assembly as above, it is beneficial to ensure the usage performance of the explosion-proof valve, and further improve the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of the explosion-proof valve patch according to the first embodiment of the present invention from one perspective; Figure 2 is a schematic structural diagram of the explosion-proof valve patch according to the first embodiment of the present invention from another perspective; Figure 3 is a schematic structural diagram of the explosion-proof valve patch in the use state according to the first embodiment of the present invention; Figure 4 is Figure 3 a sectional view taken along the line D-D in

[0020] Description of the reference numerals in the drawings: 1. Explosion-proof valve patch; 2. Cell cover plate; 3. Adhesive layer; 101. Main body part; 102. Edge part; 1021. Connection area; 1022. Glue-free area; 1023. Communication channel; 103. Communication channel; 104. First section; 105. Second section; 106. Third section; 201. Liquid injection hole; 202. Information identification code; 203. Explosion-proof valve mounting hole. Detailed implementation manners

[0021] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. Embodiment 1

[0024] This embodiment relates to an explosion-proof valve patch 1, which covers the outside of the explosion-proof valve mounting hole 203 of the cell cover plate 2 and is located between the liquid injection hole 201 and the information identification code 202. To solve the problems in the prior art that the structural design of the explosion-proof valve patch 1 is unreasonable, resulting in the easy deformation of the explosion-proof valve and the electrolyte overflowing during liquid injection is likely to contaminate the information identification code 202.

[0025] In terms of the overall composition, the explosion-proof valve patch 1 in this embodiment includes a main body part 101 adapted to the explosion-proof valve mounting hole 203, and an edge part 102 arranged along the outer periphery of the main body part 101. The side of the edge part 102 facing the cell cover plate 2 is provided with a glue-free area 1022 and a connection area 1021 having an adhesive layer 3. Among them, the edge part 102 is connected to the cell cover plate 2 through the adhesive layer 3, and a communication channel 103 is formed among the glue-free area 1022, the adhesive layer 3 and the cell cover plate 2. The communication channel 103 is used to communicate the explosion-proof valve mounting hole 203 with the outside of the cell cover plate 2 and guide the overflowing electrolyte into the explosion-proof valve mounting hole 203.

[0026] The explosion-proof valve patch 1 described in this embodiment forms a communication channel 103 surrounded by the glue-free area 1022 on the edge portion 102, the glue layer 3, and the cell cover plate 2. The communication channel 103 not only enables the air pressure between the explosion-proof valve mounting hole 203 and the outside to be balanced. When the pressure in the explosion-proof valve mounting hole 203 increases, the gas can be discharged through the communication channel 103; when the pressure in the explosion-proof valve mounting hole 203 decreases, the outside gas can enter, which helps prevent the explosion-proof valve from deforming due to pressure difference problems. In addition, the overflowing electrolyte can flow into the explosion-proof valve mounting hole 203 through the communication channel 103. Considering that the amount of overflowing electrolyte is small, even if it flows into the explosion-proof valve mounting hole 203, the pollution rate of the explosion-proof valve is within the allowable range, thus avoiding the pollution of the information identification code 202 by the electrolyte, and further helping to ensure the use performance of the information identification part.

[0027] Based on the above overall introduction, an exemplary structure of the explosion-proof valve patch 1 described in this embodiment is as Figures 1 to 4 shown in. Among them, the explosion-proof valve mounting hole 203 is a through hole provided in the thickness direction of the cell cover plate 2, and the side of the explosion-proof valve mounting hole 203 facing outside the cell cover plate 2 is coplanar with the cell cover plate 2. In particular, in this application, to ensure the use effect of the communication channel 103, there is no need to provide a boss on the cell cover plate 2 along the circumference of the explosion-proof valve mounting hole 203.

[0028] In this embodiment, the main body portion 101 being adapted to the explosion-proof valve mounting hole 203 means that the projection of the explosion-proof valve mounting hole 203 and the outer contour of the main body portion 101 in the thickness direction of the cell cover plate 2 completely coincide, that is, the shape and size of the main body portion 101 are exactly the same as the shape and specifications of the explosion-proof valve mounting hole 203. The shapes of the outer contour and the inner contour of the edge portion 102 are the same as the shape of the outer contour of the main body portion 101. Among them, the dividing line between the edge portion 102 and the main body portion 101 is as Figure 1 shown by the dotted line in.

[0029] The explosion-proof valve mounting hole 203 in this embodiment is in the shape of Figure 1 an oblong shown in. At this time, the main body portion 101 is also oblong, and the outer contour and the inner contour of the edge portion 102 are also oblong. Of course, the explosion-proof valve patch 1 can also be in any one of a circular shape, a rectangular shape, an oval shape, or a square shape to adapt to explosion-proof valve mounting holes 203 of different shapes, having better flexibility, and at the same time meeting the use requirements for protecting the explosion-proof valve.

[0030] In some embodiments, there are multiple connecting regions 1021 circumferentially spaced along the edge portion 102, and the non-adhesive regions 1022 are respectively disposed between the two ends of two adjacent connecting regions 1021. Through the multiple connecting regions 1021, it is beneficial to form multiple communication channels 103, thereby improving the ventilation and the inflow efficiency of the electrolyte. Moreover, when one of the communication channels 103 cannot be used, the purpose of balancing the air pressure and guiding the electrolyte to flow in can also be achieved through other communication channels 103.

[0031] Specifically, as shown in Figure 1 and Figure 2 , the connecting regions 1021 are two ends relatively disposed at both ends of the edge portion 102, and each connecting region 1021 is formed along the two ends of the edge portion 102. In this way, the communication channels 103 are correspondingly disposed on both sides in the width direction of the explosion-proof valve patch 1, that is, two relatively disposed communication channels 103 are formed between the explosion-proof valve patch 1, the adhesive layer 3 and the battery cell cover plate 2. In some other embodiments, there may be only one connecting region 1021, and the non-adhesive region 1022 is disposed between the two ends of the connecting region 1021. At this time, it is also beneficial to meet the use requirements of ventilation and guiding the electrolyte to flow into the explosion-proof valve mounting hole 203, and the structure is simple and easy to process and form.

[0032] As a preferred embodiment, the flow area S of the communication channel 103 satisfies: 0.5 mm 2 ≤ S ≤ 60 mm 2 . The flow area here specifically refers to the cross-sectional area perpendicular to the flow direction of the electrolyte in the communication channel 103. The setting of the range of the flow area S is beneficial to ensure the use requirements of ventilation and electrolyte inflow. When the flow area is less than 0.5 mm 2 , the ventilation effect is poor, and the electrolyte is not easy to flow into the explosion-proof valve mounting hole 203; when the flow area is greater than 60 mm 2 , the connection effect of the explosion-proof valve patch 1 will be poor, and it is easy for foreign objects to block the communication channel 103 or enter the explosion-proof valve mounting hole 203. Specifically in implementation, the flow area S of the communication channel 103 can be, for example, 0.5 mm 2 , 1 mm 2 , 10 mm 2 , 30 mm 2 , 40 mm 2 , 45 mm 2 , 50 mm 2 , 55 mm 2 , 58 mm 2 or 60 mm 2 .

[0033] To verify the rationality of the flow area S of the communication channel 103 in this embodiment, the following comparative tests were carried out. The test parameters and results are shown in Table 1.

[0034] Table 1:

[0035] Among them, the flow area S of the communication channel 103 in Embodiments 1 to 7 is within the corresponding reasonable value range. At this time, the electrolyte can flow into the explosion-proof valve mounting hole 203 through the communication channel 103, and the pollution rate of the explosion-proof valve is less than 1%, so the service performance of the explosion-proof valve will not be affected. At the same time, because the electrolyte flows into the explosion-proof valve mounting hole 203, when the battery cell is at high temperature and static, the electrolyte cannot flow out of the explosion-proof valve mounting hole 203 again and contaminate the information identification code 202.

[0036] In addition, the communication effect between the communication channel 103 and the outside is good, so that the explosion-proof valve will not be deformed due to the pressure difference between the inside and the outside of the explosion-proof valve mounting hole 203, which is conducive to ensuring the service performance of the explosion-proof valve and making the performance of the explosion-proof valve patch 1 qualified. At the same time, the bonding strength of the explosion-proof valve patch 1 also meets the requirements. Moreover, foreign objects are not easy to enter the explosion-proof valve mounting hole 203. Even if a small amount of tiny foreign objects enter the explosion-proof valve mounting hole 203, it will not affect the service performance of the explosion-proof valve.

[0037] In Comparative Example 1 and Comparative Example 2, the value of the flow area S is less than 0.5 mm 2 , and it is not easy for the electrolyte to flow into the liquid inlet part through the communication channel 103, resulting in poor effect of the electrolyte flowing into the explosion-proof valve mounting hole 203. Most of the electrolyte cannot flow into the explosion-proof valve mounting hole 203 and remains near the communication channel 103, or directly flows to the information identification code 202. When the battery cell is at high temperature and static, the electrolyte will still contaminate the information identification code 202, and foreign objects are not easy to enter the explosion-proof valve mounting hole 203 through the communication channel 103 and then contaminate the explosion-proof valve.

[0038] At the same time, due to the small size of the flow area S, the improvement of the pressure difference problem between the explosion-proof valve mounting hole 203 and the outside is not obvious, and the explosion-proof valve will be deformed during use. Therefore, the explosion-proof valve patch 1 in Comparative Example 1 and Comparative Example 2 is unqualified.

[0039] In Comparative Example 3 and Comparative Example 4, the value of the flow area S is greater than 60 mm 2, at this time, since the specification of the communication channel 103 is relatively large, it is beneficial to improve the pressure difference problem between the explosion-proof valve mounting hole 203 and the outside. Therefore, the explosion-proof valve is not easily deformed during use, and the electrolyte can still flow into the explosion-proof valve mounting hole 203 through the communication channel 103, and the pollution rate of the explosion-proof valve is higher than 2%. However, due to the relatively large specification of the communication channel 103, foreign objects are still likely to flow into the explosion-proof valve mounting hole 203 through the communication channel 103. The bonding strength of the explosion-proof valve patch 1 in Comparative Example 3 does not meet the requirements. Therefore, the explosion-proof valve patches 1 in Comparative Example 3 and Comparative Example 4 are both unqualified.

[0040] As a preferred embodiment, the ratio P of the total area M of the glue-free area 1022 in the thickness direction of the explosion-proof valve patch 1 to the area N of the edge portion 102 in the thickness direction of the explosion-proof valve patch 1 satisfies: 0.005 ≤ P ≤ 0.5. Such a setting is beneficial to ensuring the pressure balance effect of the communication channel 103, thereby maintaining the pressure balance on both sides of the explosion-proof valve, and further preventing the explosion-proof valve from deforming. It should be noted that: the total area M of the glue-free area 1022 in the thickness direction of the explosion-proof valve patch 1 is specifically Figure 1 the total area of the glue-free area 1022 under the shown perspective, and the area N of the edge portion 102 in the thickness direction of the explosion-proof valve patch 1 is specifically Figure 1 the area of the edge portion 102 under the shown perspective.

[0041] When the ratio P is lower than 0.005, the ventilation effect of the communication channel 103 cannot be ensured, and the electrolyte cannot be guided into the explosion-proof valve mounting hole 203. When the ratio P is higher than 0.5, it may cause the explosion-proof valve patch 1 to be not firmly adhered to the cell cover plate 2. Specifically in implementation, the ratio P of the total area M of the glue-free area 1022 to the area N of the edge portion 102 can be, for example, 0.005, 0.01, 0.1, 0.15, 0.2, 0.3, 1, 0.4, 0.45 or 0.5, etc.

[0042] Specifically in implementation, the total area of the glue-free area 1022 is equal to the area of the edge portion 102 minus the total area of the connection area 1021. Taking Figure 1 as an example, the end of the edge portion 102 is in a semi-circular arc shape, and the radius of the outer contour of the semi-circular arc is A, the radius of the inner contour is B, and the center distance between the two semi-circular arcs at both ends of the edge portion 102 is C. Then the area N of the edge portion 102 = π * (A 2 - B 2 ) + 2 * (A - B) * C. When the explosion-proof valve patch 1 is circular, the circular distance C is equal to 0.

[0043] To verify the rationality of the above area ratio P in this embodiment, a verification test was carried out, and the specific verification results are shown in Table 2.

[0044] Table 2:

[0045] As can be seen from Samples 1 to 3, Samples 5 to 9, and Sample 11 in Table 2, when the ratio P of the total area M of the non-adhesive region 1022 to the area N of the edge portion 102 satisfies 0.005 ≤ P ≤ 0.5, the explosion-proof valve will not deform, and the bonding effect between the explosion-proof valve patch 1 and the battery cell cover plate 2 is good. In Sample 4, since the ratio P is less than 0.005, that is, the area of the non-adhesive region 1022 accounts for a relatively low proportion, there is overglue plugging in the non-adhesive region 1022. At this time, the ventilation effect of the communication channel 103 is poor, the explosion-proof valve deforms, and at the same time, the bursting pressure of the battery cell is unstable, which is not conducive to the safety of the battery cell.

[0046] In Sample 10, when the ratio P is greater than 0.5, that is, the area of the non-adhesive region 1022 is large, the adhesive force of the explosion-proof valve patch 1 is insufficient and it is easy to fall off, so the explosion-proof valve cannot be protected, and external impurities are likely to enter the explosion-proof valve installation hole 203 and then contaminate the explosion-proof valve, thus affecting the service performance of the explosion-proof valve.

[0047] In addition, as Figure 3 shown, the edge portion 102 of this embodiment has a first section 104 facing the liquid injection hole 201, a second section 105 opposite to the first section 104, and a third section 106 respectively connecting the same ends of the first section 104 and the second section 105. The non-adhesive region 1022 is provided in the middle of the second section 105 and / or the middle of the third section 106.

[0048] In this embodiment, the non-adhesive region 1022 is arranged in the middle of the second section 105 and the third section 106, making the flow path of the electrolyte clearer and smoother, and guiding the overflowing electrolyte to flow into the communication channel 103, and then into the explosion-proof valve installation hole 203, preventing the problem of low inflow of the electrolyte into the communication channel 103 caused by the non-adhesive region 1022 being too close to the liquid injection hole 201. During specific implementation, the number and position of the non-adhesive regions 1022 can also be adaptively adjusted according to the usage requirements as long as the usage requirements are met.

[0049] In addition, in this embodiment, the thickness d of the main body portion 101 and the edge portion 102 satisfies 0.01 mm ≤ d ≤ 8 mm. Among them, the same thickness of the main body portion 101 and the edge portion 102 is beneficial to meeting the usage requirements of the explosion-proof valve patch 1. At the same time, the setting of the thickness d range here is also beneficial to preventing the explosion-proof valve patch 1 from being easily deformed and affecting the use stability due to the thickness d being less than 0.01 mm, and is beneficial to preventing high costs caused by the thickness d being greater than 8 mm. During specific implementation, the thickness d of the explosion-proof valve patch 1 can be, for example, 0.01 mm, 0.05 mm, 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 7 mm, or 8 mm, etc.

[0050] The explosion-proof valve patch 1 described in this embodiment forms a communication channel 103 between the explosion-proof valve patch 1 and the battery cell cover plate 2, which is beneficial to preventing the deformation of the explosion-proof valve caused by the pressure difference problem, and is also beneficial to guiding the electrolyte overflowing during the electrolyte injection process into the explosion-proof valve mounting hole 203, thereby preventing the electrolyte from contaminating the information identification code 202, and further beneficial to improving the use performance of the explosion-proof valve patch 1 and the explosion-proof valve. Embodiment Two

[0051] This embodiment relates to a cover plate assembly, as Figure 3 and Figure 4 shown in, including a battery cell cover plate 2, the battery cell cover plate 2 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 an explosion-proof valve patch 1 as above is provided outside the explosion-proof valve mounting hole 203.

[0052] For the cover plate assembly of this embodiment, by providing the explosion-proof valve patch 1 as above, it is beneficial to prevent the deformation of the explosion-proof valve and to prevent the information identification code 202 from being contaminated by the overflowing electrolyte, thereby being beneficial to improving the use performance of the cover plate assembly.

[0053] In addition, this embodiment also relates to a battery cell including the cover plate assembly as above.

[0054] For the battery cell of this embodiment, by providing the cover plate assembly as above, it is beneficial to ensure the use performance of the explosion-proof valve, and further improve the safety of the battery cell.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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) and 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 a side of the edge portion (102) facing the battery cell cover plate (2) is provided with a non-glue area (1022) and a connection area (1021) having a glue layer (3); The edge portion (102) is connected to the cell cover plate (2) via the adhesive layer (3), and a communication channel (103) is formed between the adhesive-free area (1022), the adhesive layer (3) and the cell cover plate (2), wherein the communication channel (103) is used to connect the explosion-proof valve installation hole (203) and the outside of the cell cover plate (2), and guide overflowed electrolyte to flow into the explosion-proof valve installation hole (203); The flow area S of the communication channel (103) satisfies: 0.5 mm 2 ≤S≤60mm 2 .

2. The explosion-proof valve patch according to claim 1, characterized in that: The ratio P of the total area M of the glue-free region (1022) in the thickness direction of the explosion-proof valve patch (1) to the area N of the edge portion (102) in the thickness direction of the explosion-proof valve patch (1) satisfies: 0.005≤P≤0.

5.

3. The explosion-proof valve patch according to claim 1, characterized in that: The edge portion (102) comprises a first section (104) disposed toward the liquid injection hole (201), a second section (105) disposed opposite to the first section (104), and a third section (106) respectively connected between the same ends of the first section (104) and the second section (105); The glue-free area (1022) is arranged in the middle of the second section (105) and / or the middle of the third section (106).

4. The explosion-proof valve patch according to claim 1, characterized in that: The connection areas (1021) are multiple and arranged at intervals along the circumferential direction of the edge portion (102), and the glue-free areas (1022) are respectively arranged between the two ends of two adjacent connection areas (1021); or, There is one connection area (1021), and the glue-free area (1022) is provided between two ends of the connection area (1021).

5. The explosion-proof valve patch according to claim 1, characterized in that: The thickness d of the main body portion (101) and the edge portion (102) satisfies: 0.01 mm≤d≤8 mm.

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

7. 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 6 is provided on the outer side of the explosion-proof valve installation hole (203).

8. A battery cell, characterized in that: Includes the cover plate assembly as claimed in claim 7.

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