Anti-explosion valve, cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses an anti-explosion valve, a cover plate assembly and a battery, the anti-explosion valve comprises a valve body, and the valve body is sequentially provided with nicks and a liquid storage tank at intervals from inside to outside; the liquid storage groove is annularly formed in the valve body, and the groove opening direction of the liquid storage groove and the opening direction of the nick are located on the same side of the valve body. According to the explosion-proof valve, the liquid storage tank is arranged at the edge position of the explosion-proof valve, so that electrolyte overflowing from the liquid injection hole is blocked, the electrolyte is prevented from corroding a nick in the explosion-proof valve, the damage to the explosion-proof valve is avoided, the use performance of the explosion-proof valve is guaranteed, and the safety of a battery is improved.

Description

Technical Field

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

[0002] During the production process of battery electrolyte injection, electrolyte overflow often occurs, causing the electrolyte to flow into the explosion-proof valve. The explosion-proof valve is made of metal. The electrolyte will corrode the explosion-proof valve, especially the notches on the explosion-proof valve, causing the explosion-proof valve to fail. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an explosion-proof valve, a cover plate assembly and a battery.

[0004] The first aspect of the utility model provides an explosion-proof valve, comprising: a valve body, wherein the valve body is provided with notches and liquid storage tanks in sequence from the inside to the outside; wherein the liquid storage tank is arranged in a ring shape on the valve body, and the notch direction of the liquid storage tank and the opening direction of the notch are located on the same side of the valve body.

[0005] The explosion-proof valve provided by the utility model has a simple structure and is easy to operate. A liquid storage tank is provided at the edge of the explosion-proof valve to block the electrolyte overflowing from the injection hole, thereby preventing the electrolyte from corroding the notches inside the explosion-proof valve, thereby avoiding damage to the explosion-proof valve, ensuring the performance of the explosion-proof valve, and improving the safety of the battery.

[0006] In addition, the explosion-proof valve of the utility model may also have the following additional technical features:

[0007] Preferably, the depth of the liquid storage tank is greater than the depth of the notch.

[0008] Preferably, the liquid storage tank is integrally formed with the valve body, and a bottom end surface of the liquid storage tank protrudes from a corresponding end surface of the valve body.

[0009] Preferably, there are a plurality of liquid storage tanks, and the plurality of liquid storage tanks are sequentially arranged on the valve body from the inside to the outside; wherein,

[0010] The bottom end surfaces of the plurality of liquid storage tanks are located on the same horizontal plane;

[0011] or,

[0012] The bottom end surfaces of the plurality of liquid storage tanks are located at different horizontal planes, and the depths of the plurality of liquid storage tanks arranged sequentially from the inside to the outside increase sequentially.

[0013] Preferably, the ratio of the distance L1 between the liquid storage tank and the edge of the valve body to the width L2 of the liquid storage tank satisfies the following condition: 0.1≤L1 / L2≤3.

[0014] Preferably, there are multiple notches, each of which is linear or arc-shaped, and the multiple notches are connected at the middle position of the valve body, and each of the notches extends from the inside to the outside toward the liquid storage tank; when each of the notches is arc-shaped, the bending directions of some of the notches are the same or opposite.

[0015] Preferably, the notch comprises a first fan-shaped notch and a second fan-shaped notch, the first fan-shaped notch and the second fan-shaped notch have opposite bending directions, and the first fan-shaped notch and the second fan-shaped notch are tangentially connected.

[0016] According to a second aspect of the utility model, a cover plate assembly is provided, wherein the cover plate assembly has a first end face and a second end face arranged opposite to each other, a pressure relief hole is arranged on the cover plate assembly, and the pressure relief hole passes through the first end face and the second end face, and the explosion-proof valve described in any embodiment of the present application is installed at the first end face of the pressure relief hole.

[0017] Preferably, a protective member is arranged in the pressure relief hole of the second end surface, the protective member covers the pressure relief hole, and a vent hole communicating with the pressure relief hole is arranged at the connection between the protective member and the pressure relief hole.

[0018] A third aspect of the present invention provides a battery, wherein the battery includes the explosion-proof valve described in any embodiment of the present application, or includes the cover plate assembly described in any embodiment of the present application.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 A top view of a first structure of an explosion-proof valve provided in an embodiment of the present application;

[0022] Figure 2 A side view of an explosion-proof valve provided in an embodiment of the present application;

[0023] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0024] Figure 4A top view of the cover plate assembly provided in an embodiment of the present application;

[0025] Figure 5 A first position layout diagram of multiple liquid storage tanks provided in an embodiment of the present application;

[0026] Figure 6 A second position layout diagram of multiple liquid storage tanks provided in an embodiment of the present application;

[0027] Figure 7 A top view of a second structure of an explosion-proof valve provided in an embodiment of the present application;

[0028] Figure 8 A top view of a third structure of the explosion-proof valve provided in an embodiment of the present application;

[0029] Fig. 9 A top view of a fourth structure of an explosion-proof valve provided in an embodiment of the present application;

[0030] Fig.10 A top view of a fifth structure of an explosion-proof valve provided in an embodiment of the present application;

[0031] Fig.11 A bottom view of the cover plate assembly provided in an embodiment of the present application;

[0032] Fig.12 for Fig.11 A cross-sectional structural diagram of the middle cover assembly at position B;

[0033] Fig.13 A schematic diagram of the structure of the protective component provided in an embodiment of the present application.

[0034] In the above picture:

[0035] 100 explosion-proof valve; 110 valve body; 111 notch; 112 liquid storage tank;

[0036] 200 cover plate assembly; 201 first end surface; 202 second end surface; 210 pressure relief hole; 220 protection member; 221 transparent area; 222 non-transparent area; 2221 air vent; 230 liquid injection hole; 240 positive pole; 250 negative pole; 260 plastic. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0040] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0041] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that a specific feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0043] During the production process of battery electrolyte injection, the electrolyte will overflow from the injection hole and flow into the explosion-proof valve, and generally flow from the edge of the explosion-proof valve to the middle position. The explosion-proof valve is made of metal. Electrolytes such as hydrofluoric acid will corrode the explosion-proof valve, especially the notches on the explosion-proof valve, which will make the thickness of the explosion-proof valve at the notch position thinner. A small amount of corrosion will also cause the pressure relief threshold of the explosion-proof valve to decrease, which will lead to abnormal opening or cracks of the explosion-proof valve, thereby causing battery performance degradation and safety failure risks.

[0044] like Figure 1-3The exemplary structural schematic diagram of the explosion-proof valve 100 provided in the embodiment of the present application is shown. The explosion-proof valve 100 provided in the embodiment of the present application includes: a valve body 110, and the valve body 110 is provided with notches 111 and liquid storage tanks 112 in sequence from the inside to the outside; wherein, the liquid storage tank 112 is arranged in a ring shape on the valve body 110, and the notch direction of the liquid storage tank 112 and the opening direction of the notch 111 are located on the same side of the valve body 110.

[0045] Specifically, Figure 1 As shown, the explosion-proof valve 100 has a circular or elliptical valve body 110, and the valve body 110 is a thin sheet formed by metal stamping. An annular liquid storage groove 112 is arranged on the edge positions of the four sides of the end surface of one side of the valve body 110, and a notch 111 is arranged on the inner side of the liquid storage groove 112 on the valve body 110, that is, the liquid storage groove 112 is arranged around the notch 111, and the liquid storage groove 112 and the notch 111 are opened on the same side of the valve body 110, that is, the liquid storage groove 112 is located on the outside of the notch 111, and the liquid storage groove 112 and the notch 111 are spaced a certain distance apart.

[0046] refer to Figure 4 As shown, when a liquid such as an electrolyte is injected at the position of the injection hole 230, the electrolyte overflows at the position of the injection hole 210, etc. At this time, the electrolyte will flow from the edge position of the explosion-proof valve 100 to the middle position, and preferentially flow to the liquid storage tank 112 outside the valve body 110, and the liquid storage tank 112 can store the electrolyte overflowing from the injection hole 230. Since the amount of electrolyte overflowing from the injection hole 230 is generally small, the overflowing electrolyte can be blocked by the liquid storage tank 112, so that the electrolyte will not flow to the notch 111 located on the inner side of the liquid storage tank 112, thereby avoiding corrosion to the notch 111 and improving the safety performance of the explosion-proof valve 100.

[0047] Among them, when the explosion-proof valve 100 is used inside the battery, when the internal pressure of the battery is too high, the pressure impacts the weak area of ​​the explosion-proof valve 100, that is, it preferentially impacts the notch 111 of the explosion-proof valve 100, and the explosion-proof valve 100 will open from the notch 111 to reduce the pressure inside the battery and prevent the battery from exploding.

[0048] It should be noted that if Figures 1 to 3 As shown, the notch direction of the liquid storage tank 112 and the opening direction of the notch 111 are both toward the side away from the battery cell, and the top surface of the liquid storage tank 112 and the top surface of the notch 111 are located in the same horizontal plane, and the bottom end surface of the liquid storage tank 112 and the bottom end surface of the notch 111 can be located in the same horizontal plane or different horizontal planes. In this example, the liquid storage tank 112 and the notch 111 are both located on the valve body 110, and there is no need to change the structure of the battery cover assembly 200, and the thickness of the cover assembly 200 will not be increased, which is convenient for processing.

[0049] The explosion-proof valve 100 provided by the utility model has a simple structure and is easy to operate. A liquid storage tank 112 is provided at the edge of the explosion-proof valve 100 to block the electrolyte overflowing from the injection hole 230, thereby preventing the electrolyte from corroding the notch 111 located inside the explosion-proof valve 100, thereby avoiding damage to the explosion-proof valve 100, ensuring the performance of the explosion-proof valve 100, and improving the safety of the battery.

[0050] In some embodiments, Figure 2 and Figure 3 As shown, the depth of the liquid storage groove 112 is greater than the depth of the notch 111 .

[0051] Specifically, the top surface of the liquid storage tank 112 and the top surface of the groove of the notch 111 are located in the same horizontal plane, the bottom surface of the liquid storage tank 112 and the bottom surface of the groove of the notch 111 are located in different horizontal planes, and the height of the bottom surface of the liquid storage tank 112 is lower than the height of the bottom surface of the groove of the notch 111, so that the depth of the liquid storage tank 112 is greater than the depth of the notch 111, so that the volume of the liquid storage tank 112 is greater than the volume of the notch 111, thereby making the liquid storage tank 112 have a stronger liquid storage capacity, and the electrolyte overflowing from the injection hole 230 is preferably stored in the liquid storage tank 112 to avoid flowing to the notch 111 of the explosion-proof valve 100, so as to prevent the electrolyte from corroding the notch 111.

[0052] In some embodiments, Figure 2 and Figure 3 As shown, the liquid storage tank 112 and the valve body 110 are integrally formed, and the bottom end surface of the liquid storage tank 112 protrudes from the corresponding bottom end surface of the valve body 110 .

[0053] Specifically, the liquid reservoir 112 can be formed by stamping the valve body 110, which is easy to process and makes the thickness of the valve body 110 at the position of the liquid reservoir 112 consistent with the thickness at the position other than the liquid reservoir 112 (except the position of the notch 111), without increasing the thickness of the valve body 110. The valve body 110 is stamped to form a concave liquid reservoir 112 on one end face (the end face away from the battery cell), and a protrusion on the other end face (the end face close to the battery cell), and the protrusion can protrude from the corresponding end face of the valve body 110, so that the depth of the liquid reservoir 112 is greater than the depth of the notch 111, thereby improving the liquid storage capacity of the liquid reservoir 112.

[0054] In some embodiments, there are multiple liquid storage tanks 112, and the multiple liquid storage tanks 112 are sequentially spaced from the inside to the outside on the valve body 110; wherein,

[0055] The bottom end surfaces of the plurality of liquid storage tanks 112 are located on the same horizontal plane;

[0056] or,

[0057] The bottom end surfaces of the plurality of liquid storage tanks 112 are located at different horizontal planes, and the depths of the plurality of liquid storage tanks 112 sequentially arranged from the inside to the outside increase sequentially.

[0058] Specifically, there are multiple liquid storage tanks 112, such as 2, 3, 4, etc., and those skilled in the art can set them according to actual needs. Among them, multiple liquid storage tanks 112 are arranged in a ring-shaped manner from the inside to the outside on the valve body 110 in sequence, and the slots of the multiple liquid storage tanks 112 are located on the same side, and the multiple liquid storage tanks 112 are all located on the outside of the notch 111, that is, the multiple liquid storage tanks 112 are arranged around the notch 111 to prevent the electrolyte from flowing from the edge of the explosion-proof valve 100 to the inner notch 111.

[0059] For example, Figure 5 As shown, the bottom end surfaces of the multiple liquid storage tanks 112 can be located at the same horizontal plane. The multiple liquid storage tanks 112 arranged sequentially from the outside to the inside can block the electrolyte in sequence, further preventing the electrolyte from flowing to the notch 111 of the explosion-proof valve 100, thereby improving the performance of the explosion-proof valve 100.

[0060] Or, if Figure 6 As shown, the bottom end surfaces of the multiple liquid storage tanks 112 are located at different horizontal planes, and the depths of the multiple liquid storage tanks 112 from the edge of the valve body 110 to the inside are reduced in sequence, that is, the depth of the liquid storage tanks 112 located on the outside is deeper, and the corresponding liquid storage capacity is stronger; the depth of the liquid storage tanks 112 located on the inside is shallower, and the corresponding liquid storage capacity is weaker. When the electrolyte flows from the edge to the inside of the explosion-proof valve 100, the electrolyte flow rate at the edge position is faster, and the electrolyte flow rate at the middle position is weaker. The multiple liquid storage tanks 112 whose depths decrease in sequence from the outside to the inside can effectively block the electrolyte flow rate, further preventing the electrolyte from flowing to the notch 111 of the explosion-proof valve 100, thereby improving the safety of the explosion-proof valve 100.

[0061] In some embodiments, Figure 2 and Figure 3 As shown, the ratio of the distance L1 between the liquid storage groove 112 and the edge of the valve body 110 to the width L2 of the liquid storage groove 112 satisfies the following condition: 0.1≤L1 / L2≤3.

[0062] Specifically, the liquid reservoir 112 needs to be arranged close to the edge of the valve body 110, and the distance between the liquid reservoir 112 and the notch 111 is as far as possible, so as to effectively block the electrolyte at the edge of the valve body 110 and prevent the electrolyte from flowing from the liquid reservoir 112 to the notch 111. In this example, when the ratio of the distance L1 between the liquid reservoir 112 and the edge of the valve body 110 and the width L2 of the liquid reservoir 112 meets the above conditions, the liquid reservoir 112 can be arranged as close to the edge of the valve body 110 as possible, thereby making the distance between the liquid reservoir 112 and the notch 111 relatively far, and at the same time ensuring that the width L2 of the liquid reservoir 112 is within a reasonable range, so as to avoid the width L2 being too small, resulting in the storage capacity of the liquid reservoir 112 being insufficient to block the overflowing electrolyte, and also to avoid the width L2 being too large to affect the distance between the notch 111, so that the electrolyte can be effectively blocked by the liquid reservoir 112, and the corrosion of the notch 111 by the electrolyte can be prevented.

[0063] In some embodiments, there are multiple notches 111, each of which is linear or arc-shaped, and the multiple notches 111 are connected at the middle position of the valve body 110, and each of the notches 111 extends from the inside to the outside toward the liquid storage tank 112; when each of the notches 111 is arc-shaped, the bending directions of some of the notches 111 are the same or opposite.

[0064] Specifically, the cross section of the notch 111 is trapezoidal, U-shaped or V-shaped, etc. There are multiple notches 111, each notch 111 can be linear or arc-shaped, and multiple notches 111 are connected in the middle of the valve body 110, and each notch 111 extends from the inside to the outside toward the liquid storage tank 112 on the valve body 110 and is spaced from the liquid storage tank 112, so that multiple notches 111 are all located on the inner side of the liquid storage tank 112. When the internal pressure of the battery is too large, the notch 111 of the valve body 110 will be impacted in advance. The multiple notches 111 extending from the inside to the outside can improve the safety of the explosion-proof valve 100 when the explosion-proof valve 100 body is depressurized and exhausted. The embodiment of the present application does not specifically limit the number of notches 111, and those skilled in the art can set it according to actual needs.

[0065] It should be noted that the multiple scores 111 being connected in the middle position of the valve body 110 means that the multiple scores 111 can have one or more connecting points in the middle position of the valve body 110. When there is one connecting point, the connecting point can be set at the center point of the valve body 110 or at any position other than the center point; if there are multiple connecting points, the multiple scores 111 form connecting points at the intersection positions.

[0066] For the multiple linear notches, the multiple linear notches may be distributed radially, the multiple linear notches may be connected and arranged at the center point of the valve body 110, the angles between any two adjacent linear notches among the multiple linear notches may be the same or different, and the lengths of the various linear notches may be the same or different; or, among the multiple linear notches, some of the linear notches may be arranged in parallel along a first direction (the intervals between the some of the linear notches may be the same or different), and the remaining linear notches may be arranged in parallel along a second direction (the intervals between the some of the linear notches may be the same or different), and the first direction and the second direction may intersect, such as being arranged vertically.

[0067] For example, Figure 7 As shown, it includes four linear notches, which are a first linear notch, a second linear notch, a third linear notch and a fourth linear notch which are arranged adjacent to each other in sequence. The four linear notches are connected and arranged at the center of the valve body 110. Each linear notch is extended from the inside to the outside on the valve body 110, so that the four linear notches as a whole constitute an X-shaped notch; wherein, the angle between the first linear notch and the second linear notch is the same as the angle between the third linear notch and the fourth linear notch; the angle between the first linear notch and the fourth linear notch is the same as the angle between the second linear notch and the third linear notch; the angle between the first linear notch and the second linear notch is different from the angle between the first linear notch and the fourth linear notch.

[0068] For example, Figure 8 As shown, four linear notches are included, which are a first linear notch, a second linear notch, a third linear notch and a fourth linear notch which are arranged adjacent to each other in sequence. The four linear notches are connected and arranged at the center of the valve body 110. Each linear notch extends from the inside to the outside on the valve body 110. The angles between any two adjacent linear notches are the same, which are all 90°, so that the four linear notches as a whole constitute a cross-shaped notch.

[0069] For example, Fig. 9 As shown, the first portion of linear scores extends along a first direction, and the second portion of linear scores extends along a second direction, and the first direction is perpendicular to the second direction, so that the plurality of linear scores have three connection points in the middle of the valve body 110 .

[0070] For the multiple arc-shaped notches, the multiple arc-shaped notches can be distributed radially, and the multiple arc-shaped notches are connected and arranged at the center point of the valve body 110. The lengths of the multiple arc-shaped notches can be the same or different, and the bending directions of the arc-shaped notches can be the same or opposite. For example, the bending directions of the first part of the arc-shaped notches are the same, and the bending directions of the remaining second part of the arc-shaped notches are opposite to the bending directions of the first part of the arc-shaped notches.

[0071] For example, Fig.10As shown, six arcuate notches are included, the included angles between the arcuate notches are the same, the arcuate notches are connected and arranged at the center of the valve body 110, the bending directions of the arcuate notches are the same, and the lengths of the arcuate notches are different.

[0072] In some embodiments, the notch 111 includes a first fan-shaped notch and a second fan-shaped notch, the first fan-shaped notch and the second fan-shaped notch have opposite bending directions, and the first fan-shaped notch and the second fan-shaped notch are tangentially connected.

[0073] like Figure 1 As shown, it includes four arc-shaped notches, namely, a first arc-shaped notch, a second arc-shaped notch, a third arc-shaped notch and a fourth arc-shaped notch which are connected to each other, wherein the first arc-shaped notch and the second arc-shaped notch have opposite bending directions and are symmetrical along the first direction and constitute a first fan-shaped notch, the third arc-shaped notch and the fourth arc-shaped notch have opposite bending directions and are symmetrical along the first direction and constitute a second fan-shaped notch, the first fan-shaped notch and the second fan-shaped notch are symmetrically arranged along the second direction, and the first direction is arranged perpendicular to the second direction. In this example, the first fan-shaped notch and the second fan-shaped notch which are symmetrically arranged with opposite opening directions enable the explosion-proof valve 100 to be opened like a fan door when the pressure is released and the exhaust is exhausted, thereby improving the safety of the explosion-proof valve 100.

[0074] The second aspect of the utility model is as follows Figure 11 to Figure 12 As shown, a cover plate assembly 200 is provided, wherein the cover plate assembly 200 has a first end face 201 and a second end face 202 which are arranged opposite to each other, and a pressure relief hole 210 is arranged on the cover plate assembly 200, wherein the pressure relief hole 210 passes through the first end face 201 and the second end face 202, and the explosion-proof valve 100 described in any embodiment of the present application is installed at the first end face 201 of the pressure relief hole 210.

[0075] Specifically, the cover plate assembly 200 has a first end face 201 and a second end face 202 that are arranged opposite to each other, wherein when the cover plate assembly 200 is used for a battery, the first end face 201 is the end face facing the battery cell side, and the second end face 202 is the end face away from the battery cell side. The cover plate assembly 200 is provided with a pressure relief hole 210 that passes through the first end face 201 and the second end face 202. The pressure relief hole 210 may be a waist-shaped hole, and the shape is adapted to the shape of the explosion-proof valve 100, such as a circular or elliptical shape. The explosion-proof valve 100 described in any embodiment of the present application is installed at the pressure relief hole 210 of the first end face 201, and the valve body 110 of the explosion-proof valve 100 is connected to the cover plate assembly 200 by laser welding. The cover plate assembly 200 is also provided with conventional components such as plastic 260 below the explosion-proof valve 100 to ensure the circumferential connection sealing between the cover plate assembly 200 and the battery shell and improve the vibration-proof performance of the battery. The cover assembly 200 is also provided with an injection hole 230 for injecting electrolyte, which passes through the first end face 201 and the second end face 202 of the cover assembly 200, and the injection hole 230 and the pressure relief hole 210 are located at different positions of the cover assembly 200. The injection hole 230 is used to inject electrolyte into the battery.

[0076] When the electrolyte is injected into the injection hole 230, the electrolyte in the injection hole 230 may overflow, and the overflowed electrolyte will flow into the explosion-proof valve 100 from the pressure relief hole 210, and flow from the edge of the explosion-proof valve 100 to the middle position. The cover plate assembly 200 provided in the present application is provided with a liquid storage tank 112 at the edge of the explosion-proof valve 100 to block the electrolyte overflowing from the injection hole 230, prevent the electrolyte from corroding the notch 111 located inside the explosion-proof valve 100, avoid damage to the explosion-proof valve 100, ensure the performance of the explosion-proof valve 100, and improve the safety of the battery. It can be understood that the specific technical features and technical effects of the cover plate assembly 200 are consistent with those of the explosion-proof valve 100, and this application will not repeat them.

[0077] In some embodiments, Figure 4 , Fig.12 and Fig.13 As shown, a protective member 220 is disposed in the pressure relief hole 210 of the second end surface 202 , the protective member 220 covers the pressure relief hole 210 , and a vent hole 2221 communicating with the pressure relief hole 210 is disposed at the connection between the protective member 220 and the pressure relief hole 210 .

[0078] Specifically, when the pressure inside the battery cell is high, the expansion caused by charging and discharging will bring about a breathing effect of the internal air pressure, that is, the air pressure in the battery cell will cyclically increase and decrease. This breathing effect will cause micro-swelling and contraction of the explosion-proof valve 100, causing continuously accumulated stress on the weak structural notches 111 on the explosion-proof valve 100, resulting in cracks in the valve body 110 when the air pressure in the battery cell has not reached the pressure relief threshold. The cracks will destroy the sealing function of the battery cell explosion-proof valve 100, and there is a risk of degradation of battery cell performance and safety accidents.

[0079] In the embodiment of the present application, a protective member 220 is installed at the pressure relief hole 210 of the second end face 202 of the valve body 110. The protective member 220 can be a protective film, which covers the pressure relief hole 210 of the second end face 202. When the electrolyte is injected at the position of the injection hole 210, the electrolyte may drip to the position of the explosion-proof valve 100 along with the movement of the injection needle. The protective member 220 can directly block the electrolyte from corroding the notch 111, and an air hole 2221 connected to the pressure relief hole 210 is provided at the connection between the protective film and the pressure relief hole 210. The setting of the air hole 2221 can weaken the breathing effect, thereby improving the safety of the explosion-proof valve 100.

[0080] The protective film is located above the explosion-proof valve 100. When the battery is injected with electrolyte, the protective film can prevent the injected electrolyte from flowing to the explosion-proof valve 100 through the pressure relief hole 210, thereby effectively blocking the electrolyte. An air hole 2221 is provided at the connection between the protective film and the pressure relief hole 210. During the injection of the electrolyte, the electrolyte can flow to the explosion-proof valve 100 through the air hole 2221. The electrolyte can be stored in the liquid storage tank 112 provided at the edge of the valve body 110 of the explosion-proof valve 100 to prevent the electrolyte from flowing to the notch 111 of the explosion-proof valve 100, thereby preventing the notch 111 from being corroded and improving the safety of the explosion-proof valve 100. The air hole 2221 and the liquid storage tank 112 are arranged in sequence from the outside to the inside, that is, the air hole 2221 is arranged on the outside of the liquid storage tank 112, and the notch 111 is arranged on the inside of the liquid storage tank 112, so that the electrolyte flowing into the air hole 2221 can be effectively blocked.

[0081] like Figure 4 and Fig.13 As shown, the protective film has a transparent area 221 and a non-transparent area 222, wherein the transparent area 221 is arranged opposite to the pressure relief hole 210, and the non-transparent area 222 is circumferentially located at the outer edge of the transparent area 221. The cleanliness and integrity of the explosion-proof valve 100 in the pressure relief hole 210 can be visually checked through the transparent area 221, thereby ensuring the quality of the explosion-proof valve 100 and improving the product yield of the battery. The non-transparent area 222 can be set with a color to quickly determine whether the protective film is installed at the pressure relief hole 210 of the second end face 202, thereby further improving the product yield of the battery.

[0082] It is understandable that if Figure 4 and Fig.11 As shown, the cover plate assembly 200 is also provided with two pole holes penetrating the first end face 201 and the second end face 202, one of which is provided with a positive pole 240, and the other is provided with a negative pole 250, so as to realize the positive and negative output of the battery cell. The positive pole 240 and the negative pole 250 are respectively connected to the cover plate assembly 200 at the pole holes by using sealing rings.

[0083] A second aspect of the present invention provides a battery, wherein the battery includes the explosion-proof valve 100 described in any embodiment of the present application, or includes the cover plate assembly 200 described in any embodiment of the present application.

[0084] Specifically, the battery may be a lithium-ion battery. The specific technical features and technical effects of the battery are consistent with those of the explosion-proof valve 100 and the cover assembly 200, and will not be described in detail in the embodiments of the present application.

[0085] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An explosion-proof valve (100), characterized in that: include: A valve body (110), wherein the valve body (110) is provided with notches (111) and liquid storage grooves (112) in sequence from the inside to the outside; wherein the liquid storage groove (112) is arranged in a ring shape on the valve body (110), and the notch direction of the liquid storage groove (112) and the opening direction of the notch (111) are located on the same side of the valve body (110).

2. The explosion-proof valve (100) according to claim 1, characterized in that: The depth of the liquid storage groove (112) is greater than the depth of the notch (111).

3. The explosion-proof valve (100) according to claim 1, characterized in that: The liquid storage tank (112) and the valve body (110) are integrally formed, and the bottom end surface of the liquid storage tank (112) protrudes from the corresponding end surface of the valve body (110).

4. The explosion-proof valve (100) according to claim 1, characterized in that: There are a plurality of liquid storage tanks (112), and the plurality of liquid storage tanks (112) are sequentially arranged on the valve body (110) from the inside to the outside at intervals; wherein: The bottom end surfaces of the plurality of liquid storage tanks (112) are located on the same horizontal plane; or, The bottom end surfaces of the plurality of liquid storage tanks (112) are located at different horizontal planes, and the depths of the plurality of liquid storage tanks (112) arranged sequentially from the inside to the outside increase sequentially.

5. The explosion-proof valve (100) according to claim 1, characterized in that: The ratio of the distance L1 between the liquid storage groove (112) and the edge of the valve body (110) to the width L2 of the liquid storage groove (112) satisfies the following condition: 0.1≤L1 / L2≤3.

6. The explosion-proof valve (100) according to any one of claims 1 to 5, characterized in that: There are a plurality of notches (111), each of which is linear or arc-shaped, and the plurality of notches (111) are connected at the middle position of the valve body (110), and each of the notches (111) extends from the inside to the outside toward the liquid storage tank (112); when each of the notches (111) is arc-shaped, the bending directions of some of the notches (111) are the same or opposite.

7. The explosion-proof valve (100) according to any one of claims 1 to 5, characterized in that: The notch (111) comprises a first fan-shaped notch and a second fan-shaped notch, wherein the first fan-shaped notch and the second fan-shaped notch have opposite bending directions, and the first fan-shaped notch and the second fan-shaped notch are tangentially connected.

8. A cover plate assembly (200), characterized in that: The cover plate assembly (200) has a first end surface (201) and a second end surface (202) that are arranged opposite to each other. A pressure relief hole (210) is arranged on the cover plate assembly (200). The pressure relief hole (210) passes through the first end surface (201) and the second end surface (202). The explosion-proof valve (100) according to any one of claims 1 to 7 is installed on the pressure relief hole (210) at the first end surface (201).

9. The cover plate assembly (200) according to claim 8, characterized in that: A protective member (220) is arranged in the pressure relief hole (210) of the second end surface (202), the protective member (220) covers the pressure relief hole (210), and a vent hole (2221) connected to the pressure relief hole (210) is arranged at the connection between the protective member (220) and the pressure relief hole (210).

10. A battery, characterized in that: The battery comprises the explosion-proof valve (100) according to any one of claims 1 to 7, or comprises the cover plate assembly (200) according to claim 8 or 9.

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