An explosion-proof valve, an end cover assembly, a battery, a battery pack and an electric device

Abstract

This invention discloses an explosion-proof valve, an end cap assembly, a battery, a battery pack, and electrical equipment. The explosion-proof valve includes: a valve body with a pressure relief hole; a pressure cap assembly rotatably connected to the valve body to cover or open the pressure relief hole; and a transmission component capable of cooperating with the pressure cap assembly. The cooperation between the pressure cap assembly and the transmission component includes a first state and a second state. In the first state, the pressure cap assembly covers the pressure relief hole. When a preset pressure is reached, the pressure cap assembly and the transmission component are in the second state, where at least part of the pressure relief hole is not covered and the pressure cap assembly does not return to the first state. The technical solution provided by this application can improve the safety performance of the battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to an explosion-proof valve, an end cap assembly, a battery, a battery pack, and electrical equipment. Background Technology

[0002] An explosion-proof valve is an important safety device on a battery to prevent an explosion caused by an increase in internal gas pressure.

[0003] In existing technology, explosion-proof valves are usually equipped with springs to close the valve. When the gas pressure inside the battery increases, the gas pressure inside the battery will compress the spring and open the valve to release the pressure inside the battery. However, during the depressurization process, when the pressure inside the battery is less than the elastic force of the spring, the spring will automatically rebound and close the valve. The pressure inside the battery is not completely released, and insufficient depressurization can lead to safety accidents. Summary of the Invention

[0004] One objective of this application is to provide an explosion-proof valve, an end cap assembly, a battery, a battery pack, and an electrical device.

[0005] According to a first aspect of the embodiments of this application, an explosion-proof valve is provided, comprising:

[0006] The valve body has a pressure relief hole;

[0007] A gland assembly, which is rotatably connected to the valve body to cover or open the pressure relief hole;

[0008] A transmission component that can cooperate with the pressure cap assembly;

[0009] The pressure cap assembly cooperates with the transmission component in a first state and a second state. In the first state, the pressure cap assembly covers the pressure relief hole. When a preset pressure is reached, the pressure cap assembly and the transmission component are in the second state. The pressure cap assembly at least partially does not cover the pressure relief hole and will not return to the first state.

[0010] Optionally, the valve body is provided with a mounting hole;

[0011] The transmission component is disposed in the mounting hole;

[0012] The pressure cap assembly includes a rotating component and a cover plate, the cover plate being connected to the rotating component, and the rotating component being at least partially disposed in the mounting hole;

[0013] The transmission component can move axially along the mounting hole to drive the rotating component to rotate around the axis of the mounting hole, so that the cover plate can cover or open the pressure relief hole.

[0014] Optionally, the transmission member has a first transmission part at one end near the rotating member, and the rotating member has a second transmission part at one end near the transmission member, with the first transmission part cooperating with the second transmission part.

[0015] Optionally, the first transmission part includes a first inclined surface and a first stop surface, wherein the first inclined surface and the first stop surface form a first angle;

[0016] The second transmission part includes a second inclined surface and a second stop surface, the second inclined surface and the second stop surface forming a second included angle;

[0017] The first included angle is the same as the second included angle.

[0018] Optionally, the first included angle and the first stop surface form a limiting groove, and the second included angle and the second stop surface form a limiting block, wherein the limiting block can be embedded in the limiting groove.

[0019] Optionally, the end of the mounting hole away from the rotating member is provided with a mounting step.

[0020] The explosion-proof valve further includes a first sealing element, which is disposed on the mounting step and located between the mounting step and the transmission element.

[0021] In the first state, the first inclined surface and the second inclined surface are partially in contact.

[0022] Optionally, in the first state, in the first direction, the contact distance between the first inclined surface and the second inclined surface is X mm;

[0023] In the second state, in the first direction, the contact distance between the first inclined surface and the second inclined surface is greater than X mm;

[0024] The first direction is the axial direction of the mounting hole;

[0025] The fitting distance is the overlap distance between the first inclined surface and the second inclined surface in the first direction.

[0026] Optionally, a first limiting portion is provided on the inner wall of the mounting hole; a second limiting portion is provided on the outer wall of the rotating component, and the first limiting portion cooperates with the second limiting portion.

[0027] Optionally, the cover plate includes a third limiting part, and a fourth limiting part is provided on the outer side wall of the valve body, wherein the third limiting part cooperates with the fourth limiting part.

[0028] Optionally, the inner wall of the mounting hole is provided with a fifth limiting part arranged along the axial direction of the mounting hole, and the outer wall of the transmission member is provided with a sixth limiting part arranged along the axial direction of the transmission member, wherein the fifth limiting part cooperates with the sixth limiting part.

[0029] Optionally, the explosion-proof valve further includes an explosion-proof membrane, and the valve body has a first end face inside, with the explosion-proof membrane disposed on the first end face and covering the pressure relief hole.

[0030] Optionally, the explosion-proof membrane includes a first region and a second region, the first region corresponding to the pressure relief hole, and the thickness of the first region being less than the thickness of the second region.

[0031] Optionally, the capping assembly includes a plurality of cap plates, which are circumferentially spaced around the rotating member;

[0032] The valve body has multiple pressure relief holes, which are spaced apart around the axis of the mounting hole;

[0033] One of the cover plates corresponds to one of the pressure relief holes.

[0034] Optionally, the cover plate is provided with a first snap-fit ​​element, and the valve body is provided with a second snap-fit ​​element, wherein the first snap-fit ​​element can snap into the second snap-fit ​​element.

[0035] Optionally, a limiting groove is provided at the bottom of the valve body;

[0036] The explosion-proof valve also includes a second sealing element, which is disposed in the limiting groove.

[0037] According to a second aspect of the embodiments of this application, an end cap assembly is provided, including the explosion-proof valve described above.

[0038] According to a third aspect of the embodiments of this application, a battery is provided, comprising:

[0039] The explosion-proof valve mentioned above: or

[0040] The aforementioned end cap assembly.

[0041] According to a fourth aspect of the embodiments of this application, a battery pack is provided, including the battery described above.

[0042] According to a fifth aspect of the embodiments of this application, an electrical device is provided, including the battery pack described above.

[0043] One technical effect of this application embodiment is that when the internal air pressure of the battery increases to a preset pressure, the transmission component is impacted by the internal air pressure of the battery, thereby causing the transmission component and the pressure cap assembly to change from a first state to a second state. Under the action of the transmission component, the pressure cap assembly will partially or fully open the pressure relief hole. Under the action of the transmission component, the pressure cap assembly will not return to the first state. Therefore, after the pressure relief hole is opened, it will not return to the first state, thereby enabling the internal pressure of the battery to be completely released through the pressure relief hole, avoiding the presence of residual pressure inside the battery and causing a safety accident.

[0044] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0046] Figure 1 This is an exploded structural diagram of the explosion-proof valve in an embodiment of this application;

[0047] Figure 2 This is a schematic diagram of the explosion-proof valve in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of the explosion-proof valve in an embodiment of this application;

[0049] Figure 4 This is a schematic diagram of the explosion-proof valve in an embodiment of this application;

[0050] Figure 5 for Figure 4 Sectional view at point AA;

[0051] Figure 6 This is a schematic diagram of the first state structure when the transmission component and the rotating component cooperate in the embodiments of this application;

[0052] Figure 7 This is a schematic diagram of the second state structure when the transmission component and the rotating component are engaged in an embodiment of this application;

[0053] Figure 8 This is a schematic diagram of the second state structure when the transmission component and the rotating component are engaged in an embodiment of this application;

[0054] Figure 9 This is a schematic diagram of the valve body in an embodiment of this application;

[0055] Figure 10 This is a schematic diagram of the valve body in an embodiment of this application;

[0056] Figure 11 This is a cross-sectional view of the valve body in an embodiment of this application;

[0057] Figure 12 This is a schematic diagram of the structure of the capping assembly in an embodiment of this application;

[0058] Figure 13 This is a schematic diagram of the transmission component in an embodiment of this application;

[0059] Figure 14 This is a schematic diagram of the structure of the explosion-proof film in the embodiments of this application;

[0060] Figure 15 This is a schematic diagram of the battery structure in an embodiment of this application.

[0061] Explanation of reference numerals in the attached figures:

[0062] Explosion-proof valve 100; Battery 200;

[0063] Valve body 1; mounting hole 11; first limiting part 111; fifth limiting part 112; mounting step 113; pressure relief hole 12; outer side wall 13; fourth limiting part 131; second snap-fit ​​part 14; limiting groove 15; second end face 16; first end face 17;

[0064] Transmission component 2; sixth limiting part 21; first transmission part 22; first inclined surface 221; first stop surface 222; first included angle α;

[0065] Pressure cap assembly 3; rotating part 31; second limiting part 311; second transmission part 312; second inclined surface 3121; second stop surface 3122; second included angle b; cover plate 32; covering part 321; first snap-fit ​​part 321a; connecting part 322; third limiting part 323; clearance space 324;

[0066] Explosion-proof membrane 4; First area 41; Second area 42; Clearance hole 43;

[0067] First seal 5; second seal 6. Detailed Implementation

[0068] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0069] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0070] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0071] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0072] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0073] like Figures 1-14 As shown, according to a first aspect of the embodiments of this application, an explosion-proof valve 100 is provided, including a valve body 1, a pressure cap assembly 3, and a transmission member 2. The valve body 1 has a pressure relief hole 12. The pressure cap assembly 3 is rotatably connected to the valve body 1 to cover or open the pressure relief hole 12. The transmission member 2 can cooperate with the pressure cap assembly 3. The cooperation between the pressure cap assembly 3 and the transmission member 2 includes a first state and a second state. In the first state, the pressure cap assembly 3 covers the pressure relief hole 12. When a preset pressure is reached, the pressure cap assembly 3 and the transmission member 2 are in the second state. The pressure cap assembly 3 at least partially does not cover the pressure relief hole 12 and will not return to the first state.

[0074] like Figures 1-5 As shown, the explosion-proof valve 100 in the embodiments of this application includes a valve body 1, a transmission component 2, and a pressure cap assembly 3.

[0075] The valve body 1 is used to install on the end cap of the battery. The valve body 1 has a pressure relief hole 12, which is connected to the inside of the battery. When the internal air pressure of the battery increases to a preset pressure, the internal pressure of the battery will be released through the pressure relief hole 12 to prevent the internal pressure of the battery from being too high and causing a safety accident.

[0076] To further explain, the transmission component 2 can cooperate with the pressure cap assembly 3 so that the pressure cap assembly 3 can cover or open the pressure relief hole 12. The transmission component 2 and the pressure cap assembly 3 can be in a first state and a second state. When the transmission component 2 and the pressure cap assembly 3 are in the first state, the internal air pressure of the battery is lower than the preset pressure, and the explosion-proof valve 100 is in a normal state. When the transmission component 2 and the pressure cap assembly 3 are in the second state, the internal air pressure of the battery increases, and the explosion-proof valve 100 is in operation when the internal pressure of the battery is relieved.

[0077] In the first state, the pressure relief assembly 3 can cover the pressure relief hole 12 to protect the pressure relief hole 12 and prevent external impurities from entering the battery through the pressure relief hole 12.

[0078] like Figures 6-8 As shown, when the internal air pressure of the battery increases to the preset pressure, the transmission component 2 is impacted by the internal air pressure of the battery, thereby causing the transmission component 2 and the pressure cap assembly 3 to change from the first state to the second state. Under the action of the transmission component 2, the pressure cap assembly 3 will partially or fully open the pressure relief hole 12. Under the action of the transmission component 2, the pressure cap assembly 3 will not return to the first state. Therefore, after the pressure relief hole 12 is opened, it will not return to the first state, thereby allowing the internal pressure of the battery to be completely released through the pressure relief hole 12, avoiding the safety accident caused by residual pressure inside the battery.

[0079] In one optional embodiment, the valve body 1 has a mounting hole 11, and the transmission member 2 is disposed in the mounting hole 11; the pressure cap assembly 3 includes a rotating member 31 and a cover plate 32, the cover plate 32 is connected to the rotating member 31, and the rotating member 31 is at least partially disposed in the mounting hole 11; the transmission member 2 is capable of moving along the axial direction of the mounting hole 11 to drive the rotating member 31 to rotate around the axis of the mounting hole 11, so that the cover plate 32 can cover or open the pressure relief hole 12.

[0080] like Figure 12 As shown, the capping assembly 3 includes a rotating member 31 and a cover plate 32. The cover plate 32 is connected to the rotating member 31. When the rotating member 31 rotates, the cover plate 32 will also rotate.

[0081] like Figure 9-11 As shown, the valve body 1 has a mounting hole 11, the transmission component 2 is disposed in the mounting hole 11, and the transmission component 2 can move along the axis of the mounting hole 11. The rotating component 31 is disposed in the mounting hole 11, and the cover plate 32 is located outside the mounting hole 11 to cover the pressure relief hole 12. When the transmission component 2 is subjected to pressure from inside the battery, the transmission component 2 will move along the axis of the mounting hole 11 towards the rotating component 31 to drive the rotating component 31 to rotate around the axis of the mounting hole 11. The cover plate 32 will rotate with the rotating component 31, thereby opening the pressure relief hole 12. When the pressure relief hole 12 is opened, the transmission component 2 and the rotating component 31 cooperate with each other to keep the pressure relief hole 12 in the open state, so that the pressure inside the battery can be completely released through the pressure relief hole 12, so as to prevent the pressure relief hole 12 from closing when the internal air pressure of the battery gradually decreases, and thus prevent the residual pressure inside the battery from causing a safety accident.

[0082] To further explain, in one embodiment, the rotating member 31 is partially disposed within the mounting hole 11, and the cover plate 32 is disposed on the side wall of the rotating member 31. The cover plate 32 can protrude outside the mounting hole 11 so that the cover plate 32 can cover the pressure relief hole 12. In another embodiment, the rotating member 31 is entirely disposed within the mounting hole 11, and the cover plate 32 is disposed on the top of the rotating member 31, that is, the end away from the transmission member 2. The cover plate 32 can protrude outside the mounting hole 11 so that the cover plate 32 can cover the pressure relief hole 12.

[0083] In one embodiment, the transmission component 2 is a pawl, and the rotating component 31 is a ratchet; the mounting hole 11 includes a first hole and a second hole, with the axes of the first hole and the second hole perpendicular; the pawl is disposed in the first hole and moves along the axial direction of the first hole; the ratchet is disposed in the second hole and rotates around the axis of the second hole, and the pawl engages with the ratchet; specifically, when the internal air pressure of the battery increases to a preset pressure, the pawl moves along the axis of the first hole under the action of the internal air pressure of the battery, thereby pushing the ratchet to rotate around the axis of the second hole. Since the cover plate 32 is connected to the ratchet, the cover plate 32 also rotates accordingly. At least part of the pressure relief hole 12 is not covered by the cover plate 32, and the ratchet will not return to the first state under the action of the pawl, so the cover plate 32 will not close the pressure relief hole 12, thus achieving complete pressure relief and preventing residual pressure inside the battery from causing a safety accident.

[0084] In another embodiment, the transmission member 2 is provided with a first transmission part 22 at one end near the rotating member 31, and the rotating member 31 is provided with a second transmission part 312 at one end near the transmission member 2, and the first transmission part 22 cooperates with the second transmission part 312.

[0085] The valve body 1 has a second end face 16 and a first end face 17. The second end face 16 is the outer end face, and the first end face 17 is the inner end face. The second end face 16 and the first end face 17 are parallel. A mounting hole 11 penetrates the second end face 16 and the first end face 17 and extends away from the second end face 16 and the first end face 17, that is, extends towards the interior of the battery. The mounting hole 11 communicates with the interior of the battery. A pressure relief hole 12 penetrates the second end face 16 and the first end face 17. The depth of the mounting hole 11 is greater than the depth of the pressure relief hole 12. Because the mounting hole 11 has a certain depth, it can provide installation space for the transmission component 2 and the rotating component 31.

[0086] Further explanation: the transmission component 2 is columnar and is disposed within the mounting hole 11. A first transmission part 22 is provided at the end of the transmission component 2 near the rotating component 31, allowing the transmission component 2 to move axially along the mounting hole 11. The rotating component 31 is also columnar, with a second transmission part 312 at the end of the rotating component 31 near the transmission component 2. A cover plate 32 is disposed on the side wall of the rotating component 31 and located away from the second transmission part 312. In the first state, the first transmission part 22 and the second transmission part 312 partially engage. When the internal air pressure of the battery increases to a preset air pressure, the transmission component 2 will move along the mounting hole 11 under the action of the internal air pressure of the battery. As the axis of the battery moves, the first transmission part 22 gradually increases its contact area with the second transmission part 312, simultaneously driving the rotating part 31 to rotate around the axis of the mounting hole 11. The cover plate 32 also rotates accordingly. When the first transmission part 22 and the second transmission part 312 are fully or partially engaged, at least part of the pressure relief hole 12 is not covered by the cover plate 32. Furthermore, under the action of the transmission part 2, the rotating part 31 will not return to its first state, thus preventing the cover plate 32 from closing the pressure relief hole 12. This achieves complete pressure relief, preventing residual pressure inside the battery from causing a safety accident. In this embodiment, through the cooperation of the first transmission part 22 and the second transmission part 312, when the internal air pressure of the battery increases, the pressure relief hole 12 is opened and will not close again. Its structure is simple and does not require an additional valve opening stroke, thereby improving battery safety.

[0087] In one optional embodiment, the first transmission part 22 includes a first inclined surface 221 and a first stop surface 222, the first inclined surface 221 and the first stop surface 222 forming a first included angle α; the second transmission part 312 includes a second inclined surface 3121 and a second stop surface 3122, the second inclined surface 3121 and the second stop surface 3122 forming a second included angle b; the first included angle α and the second included angle b are the same.

[0088] In one alternative embodiment, the first included angle a forms a limiting groove with the first stop surface 222, and the second included angle b forms a limiting block with the second stop surface 3122, the limiting block being able to be embedded in the limiting groove.

[0089] like Figure 6 and Figure 13 As shown, the first transmission part 22 includes a first inclined surface 221 and a first stop surface 222. A first included angle α is formed between the first inclined surface 221 and the first stop surface 222, and a limiting groove is formed between the first inclined surface 221 and the first stop surface 222.

[0090] like Figure 6 and Figure 12The second transmission part 312 includes a second inclined surface 3121 and a second stop surface 3122. A second included angle b is formed between the second inclined surface 3121 and the second stop surface 3122, and the second inclined surface 3121 and the second stop surface 3122 will form a limiting block.

[0091] Since the first included angle a and the second included angle b are the same, when the first transmission part 22 and the second transmission part 312 cooperate, the limiting block formed by the second inclined surface 3121 and the second stop surface 3122 will fit with the limiting groove formed by the first inclined surface 221 and the first stop surface 222, so as to avoid the transmission member 2 being obstructed when driving the rotating member 31 to rotate, thereby improving the efficiency of opening the pressure relief hole 12.

[0092] To further explain, when the transmission component 2 moves along the axial direction of the mounting hole 11 to drive the rotating component 31 to rotate, after the first stop surface 222 and the second stop surface 3122 are in contact, the transmission component 2 can no longer move along the axis of the mounting hole 11, so the rotating component 31 can no longer rotate, and the pressure relief hole 12 is in a fully open state at this time.

[0093] In one embodiment, the transmission member 2 has a plurality of first transmission parts 22 disposed near the end of the rotating member 31, and the plurality of first transmission parts 22 are evenly distributed around the axis of the transmission member 2; the rotating member 31 has a plurality of second transmission parts 312 disposed near the end of the transmission member 2, and the plurality of second transmission parts 312 are evenly distributed around the axis of the rotating member 31; the number of first transmission parts 22 is the same as the number of second transmission parts 312, and one first transmission part 22 cooperates with one second transmission part 312. The provision of a plurality of first transmission parts 22 and a plurality of second transmission parts 312 can improve the stability of the cooperation between the transmission member 2 and the rotating member 31.

[0094] In an optional embodiment, the mounting hole 11 is provided with a mounting step 113 at the end away from the rotating member 31; the explosion-proof valve 100 further includes a first sealing member 5, which is disposed on the mounting step 113 and located between the mounting step 113 and the transmission member 2; in the first state, the first inclined surface 221 and the second inclined surface 3121 are partially in contact.

[0095] like Figure 5 As shown, the mounting hole 11 is provided with a mounting step 113 at the end away from the rotating member 31. The mounting step 113 can be arranged around the inner wall of the mounting hole 11 or it can be provided on the end face of the mounting hole 11 away from the rotating member 31.

[0096] To further explain, the explosion-proof valve 100 also includes a first sealing element 5. The first sealing element 5 is disposed on the mounting step 113 and located between the mounting step 113 and the transmission element 2. The first sealing element 5 is used to seal the transmission element 2 and the mounting hole 11 to prevent external impurities from entering the battery through the mounting hole 11 and to prevent the electrolyte inside the battery from leaking out of the battery through the mounting hole 11.

[0097] To further explain, in the first state, the first inclined surface 221 and the second inclined surface 3121 are partially in contact. Since the explosion-proof valve 100 is in normal condition in the first state, the air pressure inside the battery is less than the preset pressure. With the first inclined surface 221 and the second inclined surface 3121 partially in contact, the rotational force of the rotating component 31 can be converted into the axial force of the transmission component 2 in the mounting hole 11. Therefore, the transmission component 2 can press the first sealing component 5, thereby improving the sealing effect of the first sealing component 5.

[0098] In one embodiment, in the second state, the first inclined surface 221 is fully or partially fitted with the second inclined surface 3121.

[0099] like Figure 6 As shown, in the first state, the first inclined surface 221 and the second inclined surface 3121 are partially in contact, and the cover plate 32 covers the pressure relief hole 12. Figure 7 As shown, in the second state, the first inclined surface 221 and the second inclined surface 3121 are fully engaged, and the first stop surface 222 and the second stop surface 3122 are engaged. At this time, the pressure relief hole 12 is fully opened, and the transmission component 2 is restricted from continuing to move axially along the mounting hole 11, thereby restricting the rotating component 31 from continuing to rotate. This prevents the cover plate 32 from rotating excessively and covering the pressure relief hole 12 again. When the explosion-proof valve 100 enters the second state from the first state, the transmission component 2 moves axially along the mounting hole 11. The transmission component 2 moves towards the direction of the rotating component 31, and the first inclined surface 221 moves closer to the direction of the second inclined surface 3121. As a result, the contact area between the first inclined surface 221 and the second inclined surface 3121 gradually increases. The rotating component 31 also rotates around the axis of the mounting hole 11 during the process of the contact area between the first inclined surface 221 and the second inclined surface 3121 gradually increasing. The cover plate 32 also rotates with the rotation of the rotating component 31, thereby enabling the cover plate 32 to open the pressure relief hole 12.

[0100] In the second state, the first inclined surface 221 and the second inclined surface 3121 are partially in contact, and the pressure relief hole 12 is partially opened.

[0101] In one optional embodiment, in the first state, the contact distance between the first inclined surface 221 and the second inclined surface 3121 in the first direction is X mm; in the second state, the contact distance between the first inclined surface 221 and the second inclined surface 3121 in the first direction is greater than X mm; the first direction is the axial direction of the mounting hole 11; the contact distance is the overlap distance between the first inclined surface 221 and the second inclined surface 3121 in the first direction.

[0102] The first direction refers to the axial direction of the mounting hole 11. Please refer to [reference needed] for the first direction. Figure 6 The direction marked in the text.

[0103] The fitting distance refers to the overlap dimension between the first inclined surface 221 and the second inclined surface 3121 in the first direction.

[0104] like Figure 6 As shown, in the embodiment where the first inclined surface 221 and the second inclined surface 3121 are partially attached in the first state, the attachment distance between the first inclined surface 221 and the second inclined surface 3121 is X mm in the first direction, and the attachment distance between the first inclined surface 221 and the second inclined surface 3121 is greater than X mm in the second state.

[0105] In one specific embodiment, the first included angle a and the second included angle b are both 45°; in the first state, the contact distance between the first inclined surface 221 and the second inclined surface 3121 is 1mm; when the gas pressure inside the battery increases, under the action of the gas pressure, the transmission component 2 moves along the axial direction of the mounting hole 11 and drives the rotating component 31 to rotate. After the first inclined surface 221 and the second inclined surface 3121 are fully contacted, the contact distance is 7mm, and the cover plate 32 can fully open the pressure relief hole 12.

[0106] If the contact distance between the first inclined surface 221 and the second inclined surface 3121 after they are fully attached is 7mm, the transmission component 2 rotates by approximately 44.5 / 7 = 6.36 degrees for every 1mm axial movement of the mounting hole 11. Thus, the opening area of ​​the pressure relief hole 12 can be adjusted according to the rotation angle and the contact distance between the first inclined surface 221 and the second inclined surface 3121 in the first state.

[0107] In one optional embodiment, a first limiting part 111 is provided on the inner wall of the mounting hole 11; a second limiting part 311 is provided on the outer wall of the rotating member 31, and the first limiting part 111 cooperates with the second limiting part 311.

[0108] like Figure 5As shown, a first limiting part 111 is provided on the inner wall of the mounting hole 11, and a second limiting part 311 is circumferentially disposed on the inner wall of the mounting hole 11. A second limiting part 311 is provided on the outer wall of the rotating member 31, and the second limiting part 311 is circumferentially disposed on the outer wall of the rotating member 31. Since the first limiting part 111 is circumferentially disposed around the mounting hole 11, and the second limiting part 311 is circumferentially disposed around the rotating member 31, after the first limiting part 111 and the second limiting part 311 are engaged, the rotating member 31 will only rotate around the axis of the mounting hole 11. In other words, it can restrict the rotating member 31 from moving axially along the mounting hole 11, so as to prevent the gland assembly 3 from detaching from the valve body 1, thereby improving the installation stability of the gland assembly 3.

[0109] In one embodiment, the first limiting part 111 is an annular protrusion, and the second limiting part 311 is an annular groove. The annular protrusion is embedded in the annular groove, and the annular protrusion can rotate along the annular groove. Specifically, as shown... Figure 5 As shown, an annular protrusion is provided on the inner wall of the mounting hole 11, extending away from the inner wall of the mounting hole 11; an annular groove is provided on the outer wall of the rotating member 31; after the rotating member 31 is installed with the mounting hole 11, the annular protrusion is embedded in the annular groove, and the annular protrusion and the annular groove are in clearance fit, thereby enabling the rotating member 31 to rotate around the axis of the mounting hole 11. In this embodiment, providing an annular protrusion on the inner wall of the mounting hole 11 allows the wall thickness of the mounting hole 11 to be relatively thin, thereby reducing the weight of the explosion-proof valve 100.

[0110] In another embodiment, the first limiting part 111 is an annular groove, and the second limiting part 311 is an annular protrusion. The annular protrusion is embedded in the annular groove and can rotate along the annular groove.

[0111] In one alternative embodiment, the cover plate 32 includes a third limiting portion 323; the outer side wall 13 of the valve body 1 is provided with a fourth limiting portion 131, and the third limiting portion 323 cooperates with the fourth limiting portion 131.

[0112] The cover plate 32 includes a covering part 321, a connecting part 322, and a third limiting part 323. The covering part 321 is connected to the connecting part 322, and the third limiting part 323 is connected to the connecting part 322. A fourth limiting part 131 is provided on the outer side wall 13 of the valve body 1. The third limiting part 323 cooperates with the fourth limiting part 131 to restrict the axial movement of the rotating column along the mounting hole 11.

[0113] Specifically, the cover plate 32 includes a covering portion 321, a connecting portion 322, and a third limiting portion 323. The covering portion 321 is connected to the connecting portion 322, and the third limiting portion 323 is connected to the connecting portion 322. The connecting portion 322 and the covering portion 321 are connected at an angle. The covering portion 321 is located on the second end face 16 of the valve body 1 and is used to cover or open the pressure relief hole 12. A fourth limiting portion 131 is provided around the outer wall 13 of the valve body 1. The third limiting portion 323 cooperates with the fourth limiting portion 131. The connecting portion 322 is arranged around the outer wall 13 of the valve body 1, and there is a gap between the connecting portion 322 and the valve body 1. This restricts the axial movement of the cover plate 32 along the mounting hole 11, and the cooperation between the third limiting portion 323 and the fourth limiting portion 131 provides a guiding effect for the rotation of the cover plate 32.

[0114] In one embodiment, the third limiting part 323 is an annular protrusion that is connected to the end of the connecting part 322 and extends toward the center of the valve body 1; the fourth limiting part 131 is an annular groove that cooperates with the annular protrusion. The annular protrusion can rotate around the annular groove, and the annular groove can restrict the axial movement of the annular protrusion in the mounting hole 11.

[0115] In another embodiment, the third limiting part 323 is an annular groove, which is formed on the side wall of the connecting part 322; the fourth limiting part 131 is an annular protrusion, which extends toward the connecting part 322; the annular protrusion cooperates with the annular groove, so that the cover plate 32 can rotate circumferentially along the annular protrusion, and the annular protrusion can restrict the axial movement of the cover plate 32 in the mounting hole 11.

[0116] In one optional embodiment, the inner wall of the mounting hole 11 is provided with a fifth limiting part 112 arranged along the axial direction of the mounting hole 11, and the outer wall of the transmission member 2 is provided with a sixth limiting part 21 arranged along the axial direction of the transmission member 2, and the fifth limiting part 112 cooperates with the sixth limiting part 21.

[0117] like Figure 9 As shown, a fifth limiting part 112 is provided on the inner wall of the mounting hole 11 along the axial direction of the mounting hole 11; in the embodiment where the transmission member 2 is columnar, a sixth limiting part 21 is provided on the outer wall of the transmission member 2 along the axial direction of the transmission member 2. When the transmission member 2 is placed in the mounting hole 11, the fifth limiting part 112 cooperates with the sixth limiting part 21 so that the transmission member 2 can only move along the axial direction of the mounting hole 11, thereby restricting the transmission member 2 from rotating around the axis of the mounting hole 11.

[0118] In one embodiment, the fifth limiting part 112 is a protrusion that protrudes from the inner wall of the mounting hole 11; the sixth limiting part 21 is a groove, with the protrusion engaging with the groove to restrict the rotation of the transmission member 2 around the axis of the mounting hole 11. Furthermore, the engagement of the groove and the protrusion provides guidance for the transmission member 2 as it moves axially along the mounting hole 11. In this embodiment, providing a protrusion on the inner wall of the mounting hole 11 allows for a relatively thin wall thickness in the mounting hole 11, thereby reducing the weight of the explosion-proof valve 100.

[0119] In another embodiment, the fifth limiting part 112 is a groove and the sixth limiting part 21 is a protrusion. The groove and the protrusion cooperate to restrict the transmission member 2 from rotating around the axis of the mounting hole 11. After the groove and the protrusion cooperate, they can provide guidance for the transmission member 2 to move axially along the mounting hole 11.

[0120] In an optional embodiment, the explosion-proof valve 100 further includes an explosion-proof membrane 4, and the valve body 1 has a first end face 17 inside, with the explosion-proof membrane 4 disposed on the first end face 17 and covering the pressure relief hole 12.

[0121] like Figure 1 As shown, the explosion-proof valve 100 also includes an explosion-proof membrane 4, which is disposed on the first end face 17 of the valve body 1. The explosion-proof membrane 4 is sealed to the valve body 1, thereby preventing external impurities from entering the battery through the pressure relief hole 12 and preventing the electrolyte inside the battery from leaking out through the pressure relief hole 12.

[0122] To further explain, when the pressure relief hole 12 is opened, the explosion-proof membrane 4 will be shattered by the impact of the internal air pressure of the battery, thereby allowing the internal air pressure of the battery to be released through the pressure relief hole 12.

[0123] To further explain, when the internal air pressure of the battery increases to the preset pressure, the transmission component 2 moves axially along the mounting hole 11 to drive the rotating component 31 to rotate and open the pressure relief hole 12 through the cover plate 32. Since the explosion-proof membrane 4 is not broken, the internal air pressure of the battery still exists. However, after the cover plate 32 is not covering the top of the pressure relief hole 12, the top of the explosion-proof membrane 4 is also unsupported. The explosion-proof membrane 4 will be broken by the impact of the internal air pressure of the battery, thus connecting the pressure relief hole 12 with the inside of the battery. The internal air pressure of the battery will be released through the pressure relief hole 12.

[0124] In one alternative embodiment, the explosion-proof membrane 4 includes a first region 41 and a second region 42, the first region 41 corresponding to the pressure relief hole 12, and the thickness of the first region 41 being less than the thickness of the second region 42.

[0125] like Figure 14As shown, the explosion-proof membrane 4 includes a first region 41 and a second region 42. The first region 41 corresponds to the position of the pressure relief hole 12. The thickness of the first region 41 is less than the thickness of the second region 42, thereby enabling the explosion-proof membrane 4 to rupture quickly.

[0126] Preferably, the thickness of the first region 41 of the explosion-proof membrane 4 can be adjusted to control whether the pressure relief hole 12 is partially or fully opened, so that the explosion-proof membrane 4 will be shattered.

[0127] In one embodiment, the explosion-proof membrane 4 is provided with a clearance hole 43, which is fitted onto the outer wall of the mounting hole 11.

[0128] In one optional embodiment, the pressure cap assembly 3 includes a plurality of cover plates 32, which are circumferentially spaced around the rotating member 31; the valve body 1 has a plurality of pressure relief holes 12, which are spaced around the axis of the mounting hole 11; one cover plate 32 corresponds to one pressure relief hole 12.

[0129] like Figure 12 As shown, the capping assembly 3 includes multiple cover plates 32, which are circumferentially spaced around the rotating member 31, with a clearance space 324 formed between adjacent cover plates 32; Figure 9 As shown, the valve body 1 has multiple pressure relief holes 12, which are spaced circumferentially around the mounting hole 11. The number of cover plates 32 is the same as the number of pressure relief holes 12. In the first state, one cover plate 32 covers one pressure relief hole 12; in the second state, a clearance space 324 corresponds to one pressure relief hole 12, thus opening the pressure relief hole 12.

[0130] To further explain, setting multiple pressure relief holes 12 can improve the pressure relief efficiency of the battery, thereby improving the battery's safety performance.

[0131] Preferably, the capping assembly 3 is provided with four cover plates 32, which are evenly distributed around the circumference of the rotating member 31. The four cover plates 32 can achieve the preset valve opening effect, and the number is small, which is convenient for processing.

[0132] In one alternative embodiment, the cover plate 32 is provided with a first snap-fit ​​member 321a, and the valve body 1 is provided with a second snap-fit ​​member 14, wherein the first snap-fit ​​member 321a can snap-fit ​​with the second snap-fit ​​member 14.

[0133] In an embodiment where the capping assembly 3 has only one cover plate 32, the cover plate 32 is provided with a first snap-fit ​​member 321a; in an embodiment where the capping assembly 3 has multiple cover plates 32, the first snap-fit ​​member 321a is provided on any one of the cover plates 32.

[0134] To further explain, the valve body 1 is provided with a second snap-fit ​​member 14, and the first snap-fit ​​member 321a can snap into the second snap-fit ​​member 14. After the first snap-fit ​​member 321a snaps into the second snap-fit ​​member 14, the pressure cap assembly 3 can be restricted from rotating around the axis of the mounting hole 11 when the pressure cap assembly 3 is not subjected to external force, thereby preventing the pressure cap assembly 3 from opening the pressure relief hole 12 during battery transportation.

[0135] In one embodiment, the first locking member 321a is a limiting post, which is disposed on the second end face 16 of the valve body 1; the second locking member 14 is a locking groove, which is disposed at the edge of the cover plate 32, so that the limiting post can be locked in the locking groove. In the first state, the limiting post is locked in the locking groove to restrict the cover plate 32 from rotating without external force; when transitioning from the first state to the second state, the transmission member 2 rotates axially along the mounting hole 11 to drive the rotating member 31 to rotate. At this time, the cover plate 32 is subjected to external force, and the locking groove and the limiting post can easily disengage.

[0136] In another embodiment, the first snap-fit ​​member 321a is a snap-fit ​​groove, which is disposed on the second end face 16; the second snap-fit ​​member 14 is a limiting post, which is disposed at the edge of the cover plate 32 so that the limiting post can be snapped into the snap-fit ​​groove.

[0137] In one alternative embodiment, a limiting groove 15 is formed on the bottom wall of the valve body 1; the explosion-proof valve 100 further includes a second sealing element 6, which is disposed in the limiting groove 15.

[0138] To further explain, in order to ensure the sealing between the explosion-proof valve 100 and the battery end cap assembly, a limiting groove 15 is formed on the bottom wall of the valve body 1, and the second sealing element 6 is disposed within the limiting groove 15. The explosion-proof valve 100 is mounted on the end cap assembly, and the second sealing element 6 serves as the connection between the explosion-proof valve 100 and the end cap assembly.

[0139] The installation steps for explosion-proof valve 100 are as follows:

[0140] First, the first sealing member 5 is assembled onto the mounting step 113, and then the transmission member 2 is arranged in the mounting hole 11 along the axial direction of the mounting hole 11, wherein the fifth limiting part 112 cooperates with the sixth limiting part 21, and the transmission member 2 abuts against the first sealing member 5.

[0141] Then, the rotating part 31 of the pressure cap assembly 3 is inserted into the mounting hole 11. By rotating the pressure cap assembly 3, the first inclined surface 221 and the second inclined surface 3121 are partially fitted together, and the first snap-fit ​​part 321a is snapped into the second snap-fit ​​part 14, so that the transmission part 2 presses the first sealing part 5.

[0142] Finally, the explosion-proof membrane 4 is installed inside the valve body 1 to seal the pressure relief hole 12.

[0143] According to a second aspect of the embodiments of this application, an end cap assembly is provided, including the explosion-proof valve 100 described above.

[0144] like Figure 15 As shown, according to a third aspect of the embodiments of this application, a battery 200 is provided, including the explosion-proof valve 100 described above or the end cap assembly described above.

[0145] According to a fourth aspect of the embodiments of this application, a battery pack is provided, including the battery 200 described above.

[0146] According to a fifth aspect of the embodiments of this application, an electrical device is provided, including the battery pack described above.

[0147] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body has a pressure relief hole; A gland assembly, rotatably connected to the valve body to cover or open the pressure relief hole, the gland assembly including a rotating component; A transmission component that can cooperate with the pressure cap assembly; The pressure cap assembly and the transmission component cooperate in a first state and a second state. In the first state, the pressure cap assembly covers the pressure relief hole. When the preset pressure is reached, the pressure cap assembly and the transmission component are in the second state. The pressure cap assembly at least partially does not cover the pressure relief hole and will not return to the first state. The transmission component has a first transmission part at one end near the rotating component, and the rotating component has a second transmission part at one end near the transmission component, with the first transmission part cooperating with the second transmission part; The first transmission part includes a first inclined surface and a first stop surface, and the second transmission part includes a second inclined surface and a second stop surface. In the first state, the first inclined surface and the second inclined surface are partially in contact. In the second state, the first inclined surface and the second inclined surface are completely or partially in contact, and the first stop surface and the second stop surface are in contact.

2. The explosion-proof valve according to claim 1, characterized in that, The valve body is provided with mounting holes; The transmission component is disposed in the mounting hole; The pressure cap assembly further includes a cover plate, which is connected to the rotating member, and the rotating member is at least partially disposed in the mounting hole; The transmission component can move axially along the mounting hole to drive the rotating component to rotate around the axis of the mounting hole, so that the cover plate can cover or open the pressure relief hole.

3. The explosion-proof valve according to claim 2, characterized in that, The first inclined surface and the first stop surface form a first included angle; The second inclined surface and the second stop surface form a second included angle; The first included angle is the same as the second included angle.

4. The explosion-proof valve according to claim 3, characterized in that, The first included angle and the first stop surface form a limiting groove, and the second included angle and the second stop surface form a limiting block, which can be embedded in the limiting groove.

5. The explosion-proof valve according to claim 3, characterized in that, The mounting hole has a mounting step at the end away from the rotating component. The explosion-proof valve further includes a first sealing element, which is disposed on the mounting step and located between the mounting step and the transmission element. In the first state, the first inclined surface and the second inclined surface are partially in contact.

6. The explosion-proof valve according to claim 5, characterized in that, In the first state, in the first direction, the contact distance between the first inclined surface and the second inclined surface is X mm; In the second state, in the first direction, the contact distance between the first inclined surface and the second inclined surface is greater than X mm; The first direction is the axial direction of the mounting hole; The fitting distance is the overlap distance between the first inclined surface and the second inclined surface in the first direction.

7. The explosion-proof valve according to claim 2, characterized in that, The inner wall of the mounting hole is provided with a first limiting part; the outer wall of the rotating part is provided with a second limiting part, and the first limiting part cooperates with the second limiting part.

8. The explosion-proof valve according to claim 2, characterized in that, The cover plate includes a third limiting part, and a fourth limiting part is provided on the outer side wall of the valve body. The third limiting part cooperates with the fourth limiting part.

9. The explosion-proof valve according to claim 2, characterized in that, The inner wall of the mounting hole is provided with a fifth limiting part arranged along the axial direction of the mounting hole, and the outer wall of the transmission component is provided with a sixth limiting part arranged along the axial direction of the transmission component. The fifth limiting part cooperates with the sixth limiting part.

10. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve also includes an explosion-proof membrane. The valve body has a first end face inside, and the explosion-proof membrane is disposed on the first end face and covers the pressure relief hole.

11. The explosion-proof valve according to claim 10, characterized in that, The explosion-proof membrane includes a first region and a second region, the first region corresponding to the pressure relief hole, and the thickness of the first region being less than the thickness of the second region.

12. The explosion-proof valve according to claim 2, characterized in that, The pressure cap assembly includes a plurality of the cover plates, which are circumferentially spaced around the rotating member; The valve body has multiple pressure relief holes, which are spaced apart around the axis of the mounting hole; One of the cover plates corresponds to one of the pressure relief holes.

13. The explosion-proof valve according to claim 2, characterized in that, The cover plate is provided with a first snap-fit ​​component, and the valve body is provided with a second snap-fit ​​component, wherein the first snap-fit ​​component can snap-fit ​​with the second snap-fit ​​component.

14. The explosion-proof valve according to claim 1, characterized in that, A limit groove is provided at the bottom of the valve body; The explosion-proof valve also includes a second sealing element, which is disposed in the limiting groove.

15. An end cap assembly, characterized in that, Including the explosion-proof valve as described in any one of claims 1-14.

16. A battery, characterized in that, include: The explosion-proof valve as described in any one of claims 1-14: or The end cap assembly as claimed in claim 15.

17. A battery pack, characterized in that, Includes the battery as described in claim 16.

18. An electrical appliance, characterized in that, Includes the battery pack as described in claim 17.

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