Pressure relief mechanism, battery box, battery and electric device

Abstract

The utility model relates to a pressure relief mechanism, a battery box, a battery and a power utilization device, the pressure relief mechanism is applied to the battery box, the pressure relief mechanism comprises a valve body, the valve body is provided with a through hole used for being communicated with the interior of the battery box, and the side, away from the battery box, of the valve body is provided with a limiting surface surrounding the through hole; one end of the elastic piece is detachably fixed to the valve body through a fastener, and the other end of the elastic piece deforms along the limiting face so that the elastic piece can be attached to the limiting face through elastic deformation of the elastic piece and seal the through hole. According to the pressure relief mechanism, the valve body and the elastic piece are arranged in a matched mode, so that the pressure relief mechanism has the exhaust and pressure relief functions on the battery, meanwhile, the structural assembly is simple, the overall manufacturing process and the manufacturing process of the pressure relief mechanism can be simplified, the manufacturing difficulty and the manufacturing cost of the pressure relief mechanism are effectively reduced, and the requirements for low cost and convenient use are met.

Description

Technical Field

[0001] The present application relates to the technical field of battery equipment, and in particular to a pressure relief mechanism, a battery box, a battery and an electrical device. Background Art

[0002] During the use of battery packs, explosion-proof valves are usually installed to quickly exhaust and relieve pressure in battery packs that experience thermal runaway or a sharp increase in internal temperature or pressure.

[0003] In the related art, the explosion-proof valve has many components and a complex structure, which requires a high manufacturing process and manufacturing cost. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a pressure relief mechanism, a battery box, a battery and an electrical device. The pressure relief mechanism has a simple structure, can simplify the manufacturing process and flow, and reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism.

[0005] In a first aspect, the present application provides a pressure relief mechanism, which is applied to a battery box, and includes:

[0006] A valve body, provided with a through hole for communicating with the interior of the battery box, and a limiting surface surrounding the through hole is provided on a side of the valve body away from the battery box;

[0007] The spring sheet has one end detachably fixed to the valve body by a fastener, and the other end deforms along the limit surface so as to fit the limit surface and seal the through hole through its own elastic deformation.

[0008] The pressure relief mechanism according to the first aspect of the present application has at least the following beneficial effects:

[0009] The pressure relief mechanism of the present application is provided with a limiting surface around the through hole on the valve body, so that when the spring sheet is assembled, the spring sheet fixed at one end can be elastically deformed along the extension track of the limiting surface under the limiting action of the limiting surface, so that the spring sheet can be tightly fitted with the limiting surface through its own elastic deformation to achieve the sealing of the through hole. When the air pressure increases due to thermal runaway inside the battery box, the spring sheet can be pushed open under the action of the larger air pressure of the battery box, and the separation from the limiting surface is completed, so as to achieve the function of rapid exhaust and pressure relief.

[0010] The entire pressure relief mechanism, through the coordinated arrangement of the valve body and the spring sheet, has the function of exhausting and relieving pressure on the battery. At the same time, the structural components are simple, which can simplify the overall manufacturing process and manufacturing process of the pressure relief mechanism, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism, and meet the needs of low cost and convenient use.

[0011] In some embodiments, the limiting surface includes a smoothly connected flat surface and an arcuate surface, the arcuate surface is bent in a direction away from the interior of the battery box, one end of the spring is detachably fixed to the flat surface, and the other end is bent and deformed along the arcuate surface.

[0012] Such a configuration not only makes it convenient for the user to effectively fix one end of the spring sheet by means of a fastener, but also can rely on the arc-shaped bending structure of the arc-shaped surface to cause the spring sheet to undergo elastic deformation along the arc-shaped trajectory of the arc-shaped surface, thereby allowing the spring sheet to stably seal and block the through hole under the action of its own elastic deformation. In this way, there is no need to set up other structures for applying force to deform the spring sheet, thereby reducing the components of the pressure relief mechanism, simplifying the overall structure of the pressure relief mechanism, and further simplifying the overall manufacturing process and manufacturing process of the pressure relief mechanism, thereby effectively reducing the manufacturing difficulty and manufacturing cost of the pressure relief mechanism and meeting the requirements of low cost and convenient use.

[0013] In some embodiments, the pressure relief mechanism further includes a first sealing gasket disposed between the spring sheet and the limiting surface, the first sealing gasket being disposed along a circumferential edge of the through hole, and the spring sheet presses the first sealing gasket against the limiting surface through its own elastic deformation.

[0014] With such an arrangement, the first sealing gasket completely fills the gap between the spring and the through hole, keeping the through hole in a completely sealed state, reducing the risk of gas leakage from the through hole inside the battery box during normal operation of the battery, and allowing the battery to operate stably.

[0015] In some embodiments, the number of the spring pieces is at least two.

[0016] With such a configuration, the number of spring clips can be adjusted according to the specifications of the corresponding batteries, thereby adjusting the elastic deformation force applied by the spring clips on the limiting surface, thereby adjusting the preset pressure that the pressure relief mechanism can withstand, meeting the exhaust and pressure relief requirements of batteries of different specifications, and improving the adaptability and compatibility of the pressure relief mechanism with batteries of different specifications.

[0017] In some embodiments, the pressure relief mechanism further includes a second sealing gasket, which is located on a side of the valve body close to the battery box and is arranged along a circumferential edge of the through hole, and the second sealing gasket is used to abut against a side wall of the battery box.

[0018] In this way, the second sealing gasket completely fills the gap between the through hole and the side wall of the battery box, further keeping the through hole in a completely sealed state, reducing the risk of gas leakage from the through hole inside the battery box during normal operation of the battery, and making the battery work stably. At the same time, it can also reduce the probability that the gas inside the battery box is concentrated between the through hole and the side wall of the battery box and is difficult to be discharged outward through the through hole when the battery has thermal runaway, thereby improving the exhaust and pressure relief effect of the pressure relief mechanism.

[0019] In some embodiments, the valve body is provided with a plurality of connection holes for detachable connection with the battery box.

[0020] Such an arrangement makes it convenient to detachably fix the valve body to the battery box, and facilitates the disassembly, assembly and maintenance of the entire pressure relief mechanism.

[0021] In a second aspect, the present application provides a battery box, which includes the pressure relief mechanism described above.

[0022] The battery box according to the second aspect of the present application has at least the following beneficial effects:

[0023] Since the battery box of the present application is equipped with the above-mentioned pressure relief mechanism, it also has the same technical effect brought by the pressure relief mechanism, that is, the entire pressure relief mechanism has the function of exhausting and relieving pressure on the battery box through the coordinated arrangement of the valve body and the spring sheet. At the same time, the structural components are simple, which can simplify the manufacturing process and manufacturing process of the pressure relief mechanism and the battery box as a whole, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism and the battery box, and meet the needs of low cost and convenient use.

[0024] In some embodiments, the valve body is detachably disposed on the outer wall or the inner wall of the battery box; or, the valve body is integrally formed with the battery box.

[0025] In this way, the valve body can be fixed to the outer wall or inner wall of the battery box by a detachable structure such as bolts, screws, and buckles, so that the pressure relief mechanism is installed on the battery box as a whole, which is convenient for disassembly, assembly and maintenance of the pressure relief mechanism as a whole. The valve body can also be integrally formed with the battery box to simplify the manufacturing process of the battery box as a whole.

[0026] In a third aspect, the present application provides a battery, comprising the battery box described above.

[0027] In a fourth aspect, the present application provides an electrical device, wherein the electrical device comprises the battery described above, and the battery is used to provide electrical energy.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 The structure of the pressure relief mechanism of the embodiment of the present application is shown in FIG. Figure 1 .

[0031] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0032] Figure 3 This is a structural exploded view of the pressure relief mechanism of an embodiment of the present application.

[0033] Figure 4 The structure of the pressure relief mechanism of the embodiment of the present application is shown in FIG. Figure 2 .

[0034] Figure 5 The structure of the pressure relief mechanism of the embodiment of the present application is shown in FIG. Figure 3 .

[0035] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0036] Figure 7 This is a schematic diagram of the structure of the battery box according to an embodiment of the present application.

[0037] Figure 8 Schematic diagram of the structure of the battery of the embodiment of the present application.

[0038] Fig. 9 This is a structural exploded view of a battery according to an embodiment of the present application.

[0039] Fig.10 It is a schematic diagram of the structure of an electrical device according to an embodiment of the present application.

[0040] Explanation of the reference numerals: battery box 10; battery cell 20; electrical device 30; valve body 100; through hole 110; limiting surface 120; flat surface 121; arc surface 122; connecting hole 130; ear plate 140; spring piece 200; fastener 300; first sealing gasket 400; second sealing gasket 500. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0047] During the use of battery packs, explosion-proof valves are usually installed to quickly exhaust and relieve pressure in battery packs that experience thermal runaway or a sharp increase in internal temperature or pressure.

[0048] In the related art, explosion-proof valves mostly adopt one-way valves with spring structures. The explosion-proof valve as a whole includes a body, a cover, an iron sheet, a spring, a guide rod, a sealing ring, a sheath and other structures. When this type of explosion-proof valve is in normal use, the spring retracts to pull the cover to keep the battery pack sealed. When thermal runaway occurs inside the battery pack, the cover is pushed open and the pressure inside the battery pack is released.

[0049] However, the above explosion-proof valve has many components and a complex structure, requiring a high manufacturing process and manufacturing cost.

[0050] In view of the problem that the existing explosion-proof valve has a complex structure, requires high manufacturing process and manufacturing cost, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The present application provides a pressure relief mechanism, which is applied to a battery box 10 and includes a valve body 100 and a spring 200 .

[0051] The valve body 100 is provided with a through hole 110 for communicating with the interior of the battery box 10 , and a limiting surface 120 surrounding the through hole 110 is provided on a side of the valve body 100 away from the battery box 10 .

[0052] One end of the spring sheet 200 is detachably fixed to the valve body 100 by a fastener 300 , and the other end of the spring sheet 200 is deformed along the limiting surface 120 to fit the limiting surface 120 and seal the through hole 110 through its own elastic deformation.

[0053] It should be noted that in the pressure relief mechanism of the present application, the valve body 100 can be installed on the outer wall of the battery box 10, or the valve body 100 can be installed on the inner wall of the battery box 10. Of course, in other embodiments, the valve body 100 can also be integrally formed with the battery box 10, which is not specifically limited.

[0054] The shape of the valve body 100 can be a cube, a cylinder, a flat body or other shapes, which is not limited in the present embodiment. Similarly, the shape of the through hole 110 opened on the valve body 100 can be a circular hole, a square hole, a triangular hole, a polygonal hole or other shapes, which is not specifically limited.

[0055] It is not difficult to understand that in the pressure relief mechanism of the present application, the spring 200 is a flat structure, and the shape of the spring 200 is not limited. For example, it can be a square spring, a round spring, a triangular spring, an elliptical spring, etc., or it can be a spring of other irregular shapes. The manufacturing material of the spring 200 can be metal, polymer material, composite material, etc., and is not specifically limited. For example, the manufacturing material of the spring 200 can be, but not limited to, one of steel material, plastic, and copper alloy. In the present application, the spring 200 is preferably a metal spring so that it has good structural strength.

[0056] In addition, in the pressure relief mechanism of the present application, the fastener 300 can be a threaded fastener such as a bolt or a screw. Of course, the fastener 300 can also be a clamping fastener such as a clip or a chuck. There is no specific limitation. The structure of the fastener 300 can satisfy the function of detachably fixing the spring sheet 200 on the valve body 100.

[0057] It should be understood that the setting of the fastener 300, on the one hand, allows one end of the spring sheet 200 to be fixed and limited, so that the other end of the spring sheet 200 can be elastically deformed along the trajectory of the limiting surface 120 under the limiting action of the limiting surface 120 on the valve body 100, so that it can be stably attached to the limiting surface 120 of the valve body 100, so that the spring sheet 200 maintains a sealed state for the through hole 110 when the battery is in normal working state, so that the battery box 10 of the battery is in a stable sealed state. On the other hand, the fastener 300 detachably fixes the spring sheet 200 to the valve body 100, which is also convenient for disassembly, assembly and replacement of the spring sheet 200, simplifying the disassembly, assembly and maintenance process of the spring sheet 200.

[0058] It can be understood that when the pressure relief mechanism of the present application is in normal use, the valve body 100 of the pressure relief mechanism is assembled on the battery box 10, so that the through hole 110 on the valve body 100 is connected to the interior of the battery box 10, and one end of the spring 200 is detachably fixed to the valve body 100 by the fastener 300, and the other end of the spring 200 is elastically deformed along the extension trajectory of the limiting surface 120 under the limiting action of the limiting surface 120, so that it relies on its own elastic deformation to completely fit the limiting surface 120, thereby sealing the through hole 110 in the limiting surface 120, so that the battery box 10 of the battery is in a stable sealed state, so that the battery can work normally and stably.

[0059] When the battery experiences thermal runaway, the internal air pressure of the battery box 10 increases, causing the air pressure in the through hole 110 to increase. When the air pressure at the through hole 110 increases to be greater than the elastic deformation force of the spring clip 200, the end of the spring clip 200 away from the fastener 300 will be pushed open by the air pressure at the through hole 110, causing the spring clip 200 to separate from the limiting surface 120, so that the through hole 110 is partially or fully open. The internal air pressure of the battery box 10 can be released through the through hole 110, thereby realizing the function of timely exhaust and pressure relief, thereby improving the safety performance of the battery.

[0060] It is not difficult to understand that the pressure relief mechanism of the present application, by setting a limiting surface 120 around the through hole 110 on the valve body 100, enables the spring piece 200 with one end fixed to undergo elastic deformation along the extension track of the limiting surface 120 under the limiting action of the limiting surface 120 when assembling the spring piece 200, thereby closely fitting with the limiting surface 120 through its own elastic deformation to achieve sealing of the through hole 110. When the air pressure increases due to thermal runaway inside the battery box 10, the spring piece 200 can be pushed open under the action of the larger air pressure of the battery box 10, and completes the separation from the limiting surface 120, thereby achieving the function of rapid exhaust and pressure relief.

[0061] The entire pressure relief mechanism, through the coordinated arrangement of the valve body 100 and the spring 200, has the function of exhausting and relieving pressure on the battery. At the same time, the structural components are simple, which can simplify the overall manufacturing process and manufacturing process of the pressure relief mechanism, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism, and meet the needs of low cost and convenient use.

[0062] In some embodiments of the present application, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The limiting surface 120 includes a smoothly connected straight surface 121 and a curved surface 122 , the curved surface 122 is bent in a direction away from the interior of the battery box 10 , one end of the spring 200 is detachably fixed to the straight surface 121 , and the other end is bent and deformed along the curved surface 122 .

[0063] It is easy to understand that the spring sheet 200 is flat before being assembled to the valve body 100. When the spring sheet 200 is assembled to the valve body 100, one end of the spring sheet 200 is detachably fixed to the flat surface 121 by the fastener 300, so as to limit and fix the end of the spring sheet 200, and when the other end of the spring sheet 200 is fitted along the track of the arc surface 122, it will bend and deform along the arc track of the arc surface 122, thereby elastically deforming, and the bending deformation track of the spring sheet 200 is roughly coincident with the extension track of the arc surface 122, so that the spring sheet 200 is closely fitted with the flat surface 121 and the arc surface 122 under its own elastic deformation force, thereby achieving stable sealing of the through hole 110.

[0064] It should be understood that since the other end of the spring piece 200 is only subject to the limiting force of the arc surface 122, when the spring piece 200 is subjected to a larger air pressure on one side close to the through hole 110, this end of the spring piece 200 can be pushed open by the air pressure, thereby opening the through hole 110, thereby quickly completing the exhaust and pressure relief action.

[0065] It is not difficult to understand that the pressure relief mechanism of the present application, by constructing the limiting surface 120 on the valve body 100 into a smoothly connected flat surface 121 and an arc surface 122, not only facilitates the user to effectively fix one end of the spring piece 200 through the fastener 300, but also can rely on the arc-shaped bending structure of the arc surface 122 to make the spring piece 200 elastically deform along the arc-shaped trajectory of the arc surface 122, so that the spring piece 200 can stably seal and block the through hole 110 under the action of its own elastic deformation. In this way, there is no need to set up other structures for applying force to deform the spring piece 200, thereby reducing the components of the pressure relief mechanism, simplifying the overall structure of the pressure relief mechanism, and then simplifying the overall manufacturing process and manufacturing process of the pressure relief mechanism, effectively reducing the manufacturing difficulty and manufacturing cost of the pressure relief mechanism, and meeting the needs of low cost and convenient use.

[0066] In some embodiments of the present application, see Figure 1 and Figure 2 The pressure relief mechanism also includes a first sealing gasket 400 disposed between the spring sheet 200 and the limiting surface 120. The first sealing gasket 400 is disposed along the circumferential edge of the through hole 110. The spring sheet 200 presses the first sealing gasket 400 against the limiting surface 120 through its own elastic deformation.

[0067] Specifically, the first sealing gasket 400 may be a rubber ring or a silicone ring. It is understandable that the first sealing gasket 400 has a certain elastic deformation capability.

[0068] When assembling the spring sheet 200 and the first sealing gasket 400, the first sealing gasket 400 can be firstly attached to the portion of the spring sheet 200 corresponding to the through hole 110 to keep the first sealing gasket 400 stably on the spring sheet 200. Of course, the first sealing gasket 400 can also be attached to the circumferential edge of the through hole 110 first.

[0069] Then, one end of the spring sheet 200 is fixed to the valve body 100 by the fastener 300, and the other end of the spring sheet 200 is deformed along the extension trajectory of the limiting surface 120, so that the first sealing gasket 400 is pressed against the limiting surface 120 through the elastic deformation of the spring sheet 200, so that the first sealing gasket 400 is deformed under force and fits against the limiting surface 120.

[0070] In this way, the first sealing gasket 400 completely fills the gap between the spring 200 and the through hole 110, so that the through hole 110 remains completely sealed, reducing the risk of gas leakage from the through hole 110 inside the battery box 10 during normal operation of the battery, and allowing the battery to operate normally and stably.

[0071] It is understandable that when the battery experiences thermal runaway, the internal air pressure of the battery box 10 increases, and the larger air pressure at the through hole 110 pushes the spring 200 away from the limiting surface 120 of the valve body 100. At this time, the first sealing gasket 400 is separated from the support of the spring 200 and restores its deformation, and a breathable gap appears between the first sealing gasket 400 and the through hole 110. Part of the gas inside the battery box 10 is discharged outward through the breathable gap, completing the exhaust and pressure relief action.

[0072] In some embodiments of the present application, the number of the spring sheets 200 is at least two, and at least two spring sheets 200 are stacked.

[0073] It is not difficult to understand that when the multiple stacked springs 200 are elastically deformed on the limiting surface 120 of the valve body 100, the combined force of the elastic deformation force of all the springs 200 makes all the springs 200 fit tightly on the limiting surface 120 to seal and block the through hole 110. When the battery has thermal runaway, the air pressure in the through hole 110 increases to a value greater than the combined force of the elastic deformation force of all the springs 200, and the through hole 110 can be opened to achieve exhaust pressure relief.

[0074] It can be understood that the number of spring clips 200 can be adjusted according to the specifications of the corresponding batteries, so as to adjust the elastic deformation force applied by the spring clips 200 on the limiting surface 120, thereby adjusting the preset pressure that the pressure relief mechanism can withstand, meeting the exhaust and pressure relief requirements of batteries of different specifications, and improving the adaptability and compatibility of the pressure relief mechanism with batteries of different specifications.

[0075] In some embodiments of the present application, see Figure 2 , Figure 3 , Figure 4 The pressure relief mechanism also includes a second sealing gasket 500 , which is located on a side of the valve body 100 close to the battery box 10 and is arranged along the circumferential edge of the through hole 110 . The second sealing gasket 500 is used to abut against the side wall of the battery box 10 .

[0076] Specifically, the second sealing gasket 500 may be a rubber ring or a silicone ring. It is understandable that the second sealing gasket 500 has a certain elastic deformation capability.

[0077] It can be understood that when the pressure relief mechanism is assembled on the battery box 10, the side wall of the battery box 10 has an exhaust hole (not shown in the figure), and the valve body 100 can be fixed to the side wall of the battery box 10 as a whole by bolts or screws, so that the through hole 110 on the valve body 100 is aligned and connected with the exhaust hole on the battery box 10, and at the same time, the second sealing gasket 500 undergoes elastic deformation under the tightening force of the bolts or screws, thereby pressing against the side wall of the battery box 10, so that the second sealing gasket 500 completely fills the gap between the through hole 110 and the side wall of the battery box 10, further keeping the through hole 110 in a completely sealed state, reducing the risk of gas leakage from the through hole 110 inside the battery box 10 during normal operation of the battery, and allowing the battery to operate stably.

[0078] At the same time, it can also reduce the probability that the gas inside the battery box 10 is concentrated between the through hole 110 and the side wall of the battery box 10 and is difficult to be discharged outward through the through hole 110 when the battery has thermal runaway, thereby improving the exhaust and pressure relief effect of the pressure relief mechanism.

[0079] In some embodiments of the present application, see Figure 1 , Figure 3 and Figure 4 The valve body 100 is provided with a plurality of connection holes 130 for detachably connecting with the battery box 10 .

[0080] Specifically, the connecting hole 130 is constructed as a threaded hole. Correspondingly, a threaded hole that is aligned with the connecting hole 130 is also opened on the side wall of the battery box 10. The valve body 100 is detachably fixed to the battery box 10 by means of bolts or screws passing through the connecting hole 130 on the valve body 100 and the threaded holes on the side wall of the battery box 10, thereby facilitating the disassembly, assembly and maintenance of the entire pressure relief mechanism.

[0081] See also Figure 5 and Figure 6 In the pressure relief mechanism of the present application, the valve body 100 may be in a flat oval shape or a flat circular shape, and the valve body 100 has ear plates 140 at opposite ends, and the ear plates 140 are provided with connection holes 130 for detachable connection with the battery box 10.

[0082] In addition, the through hole 110 on the valve body 100 is configured as a circular hole, and the limiting surface 120 is configured as an annular surface. The limiting surface 120 also includes a straight surface and an arc surface. Correspondingly, the spring piece 200 is configured as a circular spring piece. It can be understood that the area of ​​the spring piece 200 is larger than the area of ​​the through hole 110. In this way, when the spring piece 200 deforms along the trajectory of the limiting surface 120, the spring piece 200 completely covers and seals the through hole 110 through its own elastic deformation. Similarly, in order to improve the sealing effect of the spring piece 200 on the through hole 110, a first sealing gasket 400 is sandwiched between the spring piece 200 and the through hole 110.

[0083] See also Figure 1 , Figure 4 and Figure 7 The present application also provides a battery box 10, and the battery box 10 includes the above-mentioned pressure relief mechanism.

[0084] See also Figure 8 Specifically, the battery box 10 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the battery box 10 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin.

[0085] The battery box 10 is used to accommodate one or more battery cells 20. The battery box 10 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 20.

[0086] The pressure relief mechanism can be fixed to the side wall of the battery box 10 by means of detachable structures such as screws, bolts, and buckles.

[0087] It is not difficult to understand that the battery box 10 of the present application, since it is equipped with the above-mentioned pressure relief mechanism, also has the same technical effect brought by the pressure relief mechanism, that is, the entire pressure relief mechanism has the exhaust and pressure relief function of the battery box 10 through the coordinated arrangement of the valve body 100 and the spring piece 200. At the same time, the structural components are simple, which can simplify the manufacturing process and manufacturing process of the pressure relief mechanism and the battery box 10 as a whole, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism and the battery box 10, and meet the needs of low cost and convenient use.

[0088] In some embodiments of the present application, the valve body 100 is detachably disposed on the outer wall or the inner wall of the battery box 10 ; or, the valve body 100 is integrally formed with the battery box 10 .

[0089] The valve body 100 can be fixed to the outer wall or inner wall of the battery box 10 by means of detachable structures such as bolts, screws, and snaps, so that the pressure relief mechanism is installed as a whole on the battery box 10, which facilitates the disassembly, assembly and maintenance of the pressure relief mechanism as a whole.

[0090] Of course, the valve body 100 can be integrally formed with the battery box 10 to simplify the overall manufacturing process of the battery box 10 .

[0091] See also Figure 8 and Fig. 9 The present application also provides a battery, which includes the above-mentioned battery box 10.

[0092] It should be noted that the battery mentioned in the present application refers to a single physical module including a plurality of battery cells 20 to provide a higher voltage and capacity, and the plurality of battery cells 20 are accommodated in a battery box 10 .

[0093] For example, the battery mentioned in this application may include a battery module or a battery pack. The battery cell 20 includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet.

[0094] It is not difficult to understand that the battery of the present application, since it is equipped with the above-mentioned battery box 10, also has the same technical effect brought by the above-mentioned battery box 10, that is, it can simplify the manufacturing process and manufacturing process of the pressure relief mechanism and the entire battery, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism and the battery, and meet the needs of low cost and convenient use.

[0095] Also, see Fig.10 The present application also provides an electrical device 30, which includes the above-mentioned battery, and the battery is used to provide electrical energy.

[0096] Specifically, the electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0097] In some embodiments of the present application, see Figures 1 to 10 The present application provides a pressure relief mechanism, a battery box, a battery and an electrical device, wherein the pressure relief mechanism is applied to the battery box, and comprises: a valve body, which is provided with a through hole for communicating with the interior of the battery box, and a side of the valve body away from the battery box is provided with a limiting surface surrounding the through hole; a spring sheet, one end of which is detachably fixed to the valve body by a fastener, and the other end of which is deformed along the limiting surface so as to fit the limiting surface and seal the through hole through its own elastic deformation.

[0098] The pressure relief mechanism of the present application is provided with a limiting surface around the through hole on the valve body, so that when the spring sheet is assembled, the spring sheet fixed at one end can be elastically deformed along the extension track of the limiting surface under the limiting action of the limiting surface, so that the spring sheet can be tightly fitted with the limiting surface through its own elastic deformation to achieve the sealing of the through hole. When the air pressure increases due to thermal runaway inside the battery box, the spring sheet can be pushed open under the action of the larger air pressure of the battery box, and the separation from the limiting surface is completed, so as to achieve the function of rapid exhaust and pressure relief.

[0099] The entire pressure relief mechanism, through the coordinated arrangement of the valve body and the spring sheet, has the function of exhausting and relieving pressure on the battery. At the same time, the structural components are simple, which can simplify the overall manufacturing process and manufacturing process of the pressure relief mechanism, effectively reduce the manufacturing difficulty and manufacturing cost of the pressure relief mechanism, and meet the needs of low cost and convenient use.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A pressure relief mechanism, applied to a battery box, characterized in that: include: A valve body, provided with a through hole for communicating with the interior of the battery box, and a limiting surface surrounding the through hole is provided on a side of the valve body away from the battery box; The spring sheet has one end detachably fixed to the valve body by a fastener, and the other end deforms along the limit surface so as to fit the limit surface and seal the through hole through its own elastic deformation.

2. The pressure relief mechanism according to claim 1, characterized in that: The limiting surface includes a smoothly connected straight surface and an arc surface, the arc surface is bent in a direction away from the interior of the battery box, one end of the elastic sheet is detachably fixed to the straight surface, and the other end is bent and deformed along the arc surface.

3. The pressure relief mechanism according to claim 1, characterized in that: The pressure relief mechanism further includes a first sealing gasket disposed between the spring sheet and the limiting surface. The first sealing gasket is disposed along the circumferential edge of the through hole. The spring sheet presses the first sealing gasket against the limiting surface through its own elastic deformation.

4. The pressure relief mechanism according to claim 1, characterized in that: The number of the shrapnel is at least two.

5. The pressure relief mechanism according to any one of claims 1 to 4, characterized in that: The pressure relief mechanism further includes a second sealing gasket, which is located on a side of the valve body close to the battery box and is arranged along the circumferential edge of the through hole, and is used to abut against and fit against the side wall of the battery box.

6. The pressure relief mechanism according to any one of claims 1 to 4, characterized in that: The valve body is provided with a plurality of connection holes for detachably connecting with the battery box.

7. A battery box, characterized in that: Comprising the pressure relief mechanism as described in any one of claims 1 to 6.

8. The battery box according to claim 7, characterized in that: The valve body is detachably arranged on the outer wall or the inner wall of the battery box; or, the valve body is integrally formed with the battery box.

9. A battery, characterized in that: Comprising a battery box as claimed in claim 7 or 8.

10. An electrical device, characterized in that: Comprising a battery as claimed in claim 9, the battery is used to provide electrical energy.

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