Battery box body, battery and electric device

Abstract

The utility model provides a battery box body, a battery and a power utilization device, and belongs to the field of batteries. The battery box body provided by the utility model comprises a box body wall surface, an anti-explosion valve and an elastic locking component, wherein the box body wall surface comprises a mounting hole and a vent hole; the anti-explosion valve is connected with the elastic locking component through the mounting hole, and the elastic locking component is constructed to enable the anti-explosion valve to seal the vent hole. The explosion-proof valve is directly fixed on the wall surface of the box body through the elastic locking component, and the explosion-proof valve does not need to be provided with a component which is hermetically connected with a mounting hole in the wall surface of the box body, so that the structure and the mounting difficulty of the explosion-proof valve are simplified, the number of sealing surfaces is reduced, the reliability of the explosion-proof valve for sealing the vent hole is improved, and the internal and external pressure difference of the battery box body is effectively balanced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The explosion-proof valve is an important component of battery thermal runaway. The explosion-proof valve is installed on the battery box. When the pressure inside the battery increases due to thermal runaway, the explosion-proof valve can be used to exhaust air to balance the pressure difference between the inside and outside of the battery box. The existing explosion-proof valve has a complex structure and many parts, which makes it difficult to install and has a high risk of airtight failure. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one purpose of the present application is to provide a battery box, a battery and an electrical device to improve the problem of difficulty in installing an explosion-proof valve.

[0005] An embodiment of the first aspect of the present application provides a battery case, which includes a case wall, an explosion-proof valve and an elastic locking component, wherein the case wall includes a mounting hole and a vent hole; the explosion-proof valve is connected to the elastic locking component via the mounting hole, and the elastic locking component is constructed to enable the explosion-proof valve to close the vent hole.

[0006] In the technical solution of the embodiment of the present application, the explosion-proof valve is directly fixed to the wall of the box body by an elastic locking component. The explosion-proof valve does not need to be provided with a component that is sealed and connected to the mounting hole on the wall of the box body, which simplifies the structure and installation difficulty of the explosion-proof valve, while reducing the number of sealing surfaces, improving the reliability of the explosion-proof valve in closing the vent hole, and effectively balancing the pressure difference inside and outside the battery box.

[0007] In some embodiments, the explosion-proof valve includes an explosion-proof valve body and a guide rod, wherein the first end of the guide rod is fixedly connected to the explosion-proof valve body, and the second end of the guide rod passes through the mounting hole and is connected to the elastic locking member; the explosion-proof valve body is attached to the outer surface of the box wall and closes the vent hole under the action of the elastic locking member. This makes it easier to install the explosion-proof valve, reduces the difficulty of installing the explosion-proof valve, and there is only one sealing interface between the explosion-proof valve and the box wall, which can reduce the risk of airtight failure.

[0008] In some embodiments, the elastic locking member includes a limiting member and an elastic member, the limiting member is connected to the second end of the guide rod; the two ends of the elastic member respectively abut the limiting member and the inner surface of the box wall, so that the explosion-proof valve body fits the outer surface of the box wall and closes the vent hole. By providing the limiting member and the elastic member, the installation of the explosion-proof valve can be more easily achieved, and the components and assembly procedures of the explosion-proof valve can be reduced.

[0009] In some embodiments, the guide rod includes a main body and a mounting portion located at the second end, the mounting portion is used to connect with the limiting member, and a limiting portion for limiting the limiting member is formed at the junction of the mounting portion and the main body. By setting the limiting portion, the limiting member can be limited more accurately, the locking depth of the limiting member can be controlled, and the spring compression of the elastic member and the valve opening pressure of the explosion-proof valve can be accurately controlled, thereby improving the reliability of the valve opening of the battery box.

[0010] In some embodiments, the projection of the mounting portion on the explosion-proof valve body completely falls within the projection of the main body on the explosion-proof valve body, and the projection area of ​​the mounting portion on the explosion-proof valve body is smaller than the projection area of ​​the main body on the explosion-proof valve body, so that a step surface serving as a limit portion is formed at the junction of the mounting portion and the main body. By forming a step surface as a limit portion at the junction of the mounting portion and the main body, the structural form of the limit portion can be simplified and the manufacturing cost can be reduced.

[0011] In some embodiments, the mounting portion is detachably connected to the limiting member, which can more easily realize the installation of the explosion-proof valve and is also convenient for later maintenance and replacement.

[0012] In some embodiments, the explosion-proof valve includes a first guide portion, and the box wall is provided with a second guide portion corresponding to the first guide portion, and the first guide portion cooperates with the second guide portion to guide the explosion-proof valve to move in a direction substantially perpendicular to the outer surface of the box wall. By providing the first guide portion and the second guide portion that cooperate with each other, the movement direction of the explosion-proof valve can be guided, and to a certain extent, the jamming caused by uneven force when opening or closing the valve can be curbed, thereby improving the reliability of the explosion-proof valve.

[0013] In some embodiments, the first guide portion is at least one guide rod, and the extension direction of the guide rod is perpendicular to the outer surface of the box wall; the second guide portion is at least one guide hole, and at least one guide hole is arranged in a one-to-one correspondence with at least one guide rod. By arranging the guide rod and the guide hole, the movement direction of the explosion-proof valve body can be restricted, thereby achieving uniform and reliable opening and closing of the valve.

[0014] In some embodiments, the first guide portion is arranged on the circumferential surface of the guide rod, and the second guide portion is arranged on the mounting hole, so as to facilitate the processing and installation of the explosion-proof valve.

[0015] In some embodiments, the first guide portion is a bump protruding from the surface of the guide rod, and the second guide portion is a groove on the mounting hole adapted to the bump. By arranging the bump on the circumferential surface of the guide rod, the movement direction of the guide rod can be simultaneously restricted, thereby improving the stability and reliability of the explosion-proof valve opening.

[0016] In some embodiments, the cross section of the guide rod is a polygon, and the mounting hole is a polygonal hole whose shape matches the cross section of the guide rod. Directly using the circumferential surface of the guide rod as the first guide portion can further simplify the structure of the explosion-proof valve, reduce manufacturing costs and assembly difficulty.

[0017] In some embodiments, the battery box further includes a seal, which is located between the box wall and the explosion-proof valve to seal the gap between the box wall and the explosion-proof valve. The seal can further improve the reliability of the explosion-proof valve closing the vent hole, thereby improving the sealing performance of the battery box and the reliability of the pressure relief function.

[0018] In some embodiments, a sealing groove is provided on the outer surface of the box wall or one of the surfaces of the explosion-proof valve facing the box wall, and the sealing groove is used to accommodate a sealing member.

[0019] An embodiment of the second aspect of the present application provides a battery, which includes the battery case in the above embodiment.

[0020] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0021] 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

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0023] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0024] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0025] Figure 3 A schematic diagram of a partial exploded structure of a battery box in some embodiments of the present application;

[0026] Figure 4 This is a schematic diagram of the structure of the box wall of some embodiments of the present application;

[0027] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve in some embodiments of the present application;

[0028] Figure 6 Schematic diagram of the structure of the box wall and explosion-proof valve of other embodiments of the present application;

[0029] Figure 7 Schematic diagram of the structure of explosion-proof valves in other embodiments of the present application.

[0030] Description of reference numerals:

[0031] Vehicles 1000;

[0032] Battery 100, controller 200, motor 300;

[0033] Box body 10, first part 11, second part 12;

[0034] Box wall 13, explosion-proof valve 14, elastic locking member 15, seal 16, mounting hole 131, vent hole 132, second guide portion 133, guide hole 1331, groove 134, explosion-proof valve body 141, guide rod 142, main body 1421, mounting portion 1422, limiting portion 1423, protrusion 1424, first guide portion 143, guide rod 1431, sealing groove 144, limiting member 151, elastic member 152, seal 16. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] As a key component for balancing the pressure difference between the inside and outside of the battery box, the explosion-proof valve is usually installed on the wall of the battery box. In some embodiments, the wall of the battery box is provided with a mounting hole for installing the explosion-proof valve, the explosion-proof valve is arranged as a whole in the mounting hole and is sealed and connected to the wall of the battery box through a connecting component, and the explosion-proof valve itself can open and close the valve under the action of pressure.

[0045] However, such an explosion-proof valve requires a connecting component that is sealed with the wall of the battery case, such as a connecting body, an outer sealing ring, and a locking structure of the connecting body. This not only increases the number of components of the explosion-proof valve and complicates the structure, making installation more difficult, but also there are two sealing interfaces between the explosion-proof valve and the battery case, namely the valve opening position and the installation position, which reduces the sealing reliability of the explosion-proof valve.

[0046] In order to improve the above problems, the present application proposes a battery case, which includes a case wall, an explosion-proof valve and an elastic locking member, wherein the case wall includes a mounting hole and a vent hole; the explosion-proof valve is connected to the elastic locking member through the mounting hole, and the elastic locking member is configured to close the vent hole with the explosion-proof valve. In this way, the explosion-proof valve is directly connected to the elastic locking member through a mounting hole and closes the vent hole on the case wall under the action of the elastic locking member, which is equivalent to eliminating the connection component for sealing the explosion-proof valve with the battery case. This not only simplifies the structure of the explosion-proof valve and reduces the difficulty of installation, but also makes it so that there is only one connection interface between the explosion-proof valve and the case wall that needs to be sealed, which is the valve opening position, so that the reliability of the seal can be improved.

[0047] The battery box and battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery box and battery disclosed in the present application and the like to form the electrical device can be used, which is conducive to simply and reliably discharging the gas in the battery box and balancing the internal and external air pressures.

[0048] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0049] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0050] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 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, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0051] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0052] Please refer to Figure 2 , Figure 2Schematic diagram of the exploded structure of the battery provided for some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0053] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0054] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0055] Please refer to Figures 3 to 5 , Figure 3 A schematic diagram of a partial exploded structure of a battery box in some embodiments of the present application; Figure 4 This is a schematic diagram of the structure of the box wall of some embodiments of the present application; Figure 5 This is a schematic diagram of the structure of an explosion-proof valve according to some embodiments of the present application.

[0056] The present application embodiment provides a battery box 10, such as Figure 3-Figure 4As shown, it includes a box wall 13, an explosion-proof valve 14 and an elastic locking component 15. The box wall 13 includes a mounting hole 131 and a vent hole 132; the explosion-proof valve 14 is connected to the elastic locking component 15 through the mounting hole 131, and the elastic locking component 15 is constructed to make the explosion-proof valve 14 fit against the box wall 13 to close the vent hole 132.

[0057] The battery box 10 may be a box for accommodating a plurality of battery cells, and the box wall 13 may be a wall at any position of the battery box 10, for example, it may be a wall at the top of the battery box 10. In some embodiments, the battery box 10 may also be a shell of a battery cell, and an explosion-proof valve may be installed on its surface to achieve pressure balance inside and outside the battery cell.

[0058] The vent 132 is a through hole that penetrates the box wall 13 to connect the inside and outside of the box wall 13. The mounting hole 131 is a hole for mounting the explosion-proof valve 14. The mounting hole 131 can be a through hole or a blind hole. In some embodiments, the mounting hole 131 and the vent 132 are through holes that are spaced apart. In other embodiments, the vent 132 can be reused by the mounting hole 131. For example, the mounting hole 131 has a gap other than the installation of the explosion-proof valve 14 to allow gas to circulate, and can then be used as the vent 132 to realize a gas connection port inside and outside the battery box 10.

[0059] The elastic locking member 15 is locked and connected with the explosion-proof valve 14 to fix the explosion-proof valve 14 to the outer surface of the box wall 13, and can apply a force to the explosion-proof valve 14 through its own elastic deformation, so that the explosion-proof valve 14 can close the vent 132 of the box wall 13. The closing here means that the explosion-proof valve 14 can completely cover the vent 132 and can prevent the airflow inside the battery box 10 from escaping through the vent 132.

[0060] The explosion-proof valve 14 is a normally closed valve assembly. When the pressure in the battery case 10 is normal, the explosion-proof valve 14 fits against the case wall 13 to close the vent 132. When the pressure in the battery case 10 exceeds a certain threshold, the air pressure will push open the explosion-proof valve 14, that is, drive the explosion-proof valve 14 to move away from the case wall 13, so that the gas inside the battery case 10 is discharged through the vent 132.

[0061] According to the embodiment of the present application, the explosion-proof valve 14 is directly fixed on the box wall 13 by the elastic locking member 15, which is equivalent to directly using the box wall 13 as the main structure of the explosion-proof valve. The explosion-proof valve 14 does not need to be additionally provided with a component that is sealed and connected to the mounting hole 131 of the box wall 13, thereby simplifying the structure and installation difficulty of the explosion-proof valve 14, improving the reliability of the explosion-proof valve 14 in closing the vent hole 132, and effectively balancing the pressure difference between the inside and outside of the battery box 10.

[0062] According to some embodiments of the present application, Figures 3 to 5 As shown, the explosion-proof valve 14 includes an explosion-proof valve body 141 and a guide rod 142, the first end of the guide rod 142 is fixedly connected to the explosion-proof valve body 141, and the second end of the guide rod 142 passes through the mounting hole 131 and is connected to the elastic locking component 15; the explosion-proof valve body 141 adheres to the outer surface of the box wall 13 and closes the vent hole 132 under the action of the elastic locking component 15.

[0063] The explosion-proof valve body 141 and the guide rod 142 are in a T-shaped structure. The guide rod 142 can be a rod-shaped structure extending in a direction perpendicular to the outer surface of the box wall 13. The explosion-proof valve body 141 can be a plate-shaped structure parallel to the surface of the box wall 13. The explosion-proof valve body 141 is located on the outer side of the box wall 13. The second end of the guide rod 142 passes through the mounting hole 131 and is connected to the elastic locking component 15 on the inner side of the box wall 13, so that the elastic locking component 15 fits the explosion-proof valve 141 to the outer surface of the box wall 13 through its own elastic force. The projection area of ​​the explosion-proof valve body 141 on the box wall 13 is larger than the opening area of ​​the vent hole 132, so that the explosion-proof valve 141 can close the vent hole 132 when it fits the outer surface of the box wall 13.

[0064] In some embodiments, the guide rod 142 is integrally formed with the explosion-proof valve body 141, and the guide rod 142 is detachably connected to the elastic locking member 15, such as by threaded connection. The first end of the guide rod 142 can also be detachably connected to the explosion-proof valve body 141.

[0065] By providing a guide rod 142 on the explosion-proof valve 14 to pass through the mounting hole 131 and connect with the elastic locking component 15 on the inner side of the box wall 13, the explosion-proof valve 14 can be installed more easily, reducing the difficulty of installing the explosion-proof valve 14, and there is only one sealing interface between the explosion-proof valve 14 and the box wall 13, which can reduce the risk of airtight failure.

[0066] According to some embodiments of the present application, Figure 3 As shown, the elastic locking member 15 includes a limiting member 151 and an elastic member 152, and the limiting member 151 is connected to the second end of the guide rod 142; the two ends of the elastic member 152 respectively abut the limiting member 151 and the inner surface of the box wall 13, so that the explosion-proof valve body 141 fits the outer surface of the box wall 13 and closes the vent 132.

[0067] The limiting member 151 can be connected to the second end of the guide rod 142 in a detachable manner. The two ends of the elastic member 152 respectively abut the limiting member 151 and the inner surface of the box wall 13, so that the elastic member 152 is in a compressed state and then applies elastic force to the limiting member 151 and the inner surface of the box wall 13, so that the explosion-proof valve body 141 is attached to the outer surface of the box wall 13 under the action of the elastic force and closes the vent 132. In some embodiments, the limiting member 151 can be a nut, and the elastic member 152 can be a spring.

[0068] By providing the limiting member 151 and the elastic member 152 , the explosion-proof valve can be installed more conveniently, and the number of components and assembly steps of the explosion-proof valve can be reduced.

[0069] According to some embodiments of the present application, Figure 3 and Figure 5 As shown, the guide rod 142 includes a main body 1421 and a mounting portion 1422 located at the second end. The mounting portion 1422 is used to connect with the limiting member 151. A limiting portion 1423 for limiting the limiting member 151 is formed at the junction of the mounting portion 1422 and the main body 1421.

[0070] The mounting portion 1422 and the limiting member 151 can be connected in a detachable or non-detachable manner. Since the mounting position of the limiting member 151 directly affects the compression degree of the elastic member 152, it further affects the magnitude of the elastic force applied by the elastic member 152 to the explosion-proof valve 141, and the elastic force applied by the elastic member 152 to the explosion-proof valve 141 is essentially the valve opening pressure of the explosion-proof valve. When the pressure in the battery case 10 increases, the internal gas pressure acts on the explosion-proof valve, so that the explosion-proof valve overcomes the elastic force applied by the elastic member 152 and separates from the case wall 13, so that the gas in the battery case 10 is discharged through the vent 132.

[0071] The position limiting portion 1423 provided on the guide rod 142 can limit the installation position of the elastic member 152. The position limiting portion 1423 can be a protruding structure located at the junction of the mounting portion 1422 and the main body 1421, or a stepped surface formed at the junction of the mounting portion 1422 and the main body 1421 for abutting against the position limiting member 151.

[0072] By setting the limiting portion 1423, the limiting member 151 can be limited more accurately, and the locking depth of the limiting member 151 can be controlled, thereby accurately controlling the spring compression of the elastic member 152 and the valve opening pressure of the explosion-proof valve, thereby improving the reliability of the valve opening of the battery box 10.

[0073] According to some embodiments of the present application, Figure 5As shown, the projection of the mounting portion 1422 on the explosion-proof valve body 141 completely falls within the projection of the main body 1421 on the explosion-proof valve body 141, and the projection area of ​​the mounting portion 1422 on the explosion-proof valve body 141 is smaller than the projection area of ​​the main body 1421 on the explosion-proof valve body 141, so that a step surface serving as a limiting portion 1423 is formed at the junction of the mounting portion 1422 and the main body 1421.

[0074] In some embodiments, the mounting portion 1422 and the main body portion 1421 are both rod-shaped components extending in a direction perpendicular to the outer surface of the box wall 13, such as coaxially extending cylindrical rods. The cross-sectional area (or radius) of the mounting portion 1422 is smaller than the cross-sectional area (or radius) of the main body portion 1421, so that the intersection of the two will form a step surface due to the difference in cross-sectional areas. The step surface can serve as a limiting portion 1423 to limit the limiting component 151 connected to the mounting portion 1422.

[0075] By forming a step surface as the limiting portion 1423 at the intersection of the mounting portion 1422 and the main body portion 1421, the structure of the limiting portion can be simplified and the manufacturing cost can be reduced.

[0076] According to some embodiments of the present application, Figure 3 As shown, the mounting portion 1422 is connected to the limiting member 151 in a detachable manner.

[0077] The mounting portion 1422 and the limiting member 151 can be connected in any detachable manner by threaded connection or clamping, etc. For example, the surface of the mounting portion 1422 can be provided with threads, so that the limiting member 151 can be connected to the surface of the mounting portion 1422 by threaded connection.

[0078] Connecting the mounting portion 1422 and the limiting member 151 in a detachable manner can make the installation of the explosion-proof valve easier and also facilitate subsequent maintenance and replacement.

[0079] According to some embodiments of the present application, Figures 3 to 5 As shown, the explosion-proof valve 14 includes a first guide portion 143, and the box wall 13 is provided with a second guide portion 133 corresponding to the first guide portion 143, and the first guide portion 143 cooperates with the second guide portion 133 to guide the explosion-proof valve 14 to move in a direction substantially perpendicular to the outer surface of the box wall 13.

[0080] In some embodiments, the guide rod 142 may be a cylindrical rod, the mounting hole 131 may be a circular through hole, and the explosion-proof valve body 141 acts as a piston and moves in a direction substantially perpendicular to the outer surface of the box wall 13 under pressure to open and close the valve. When the explosion-proof valve body 141 is subjected to uneven force, it may be twisted or turned over, which may result in poor valve opening and failure to discharge the high-pressure gas in time.

[0081] The extension direction of the first guide portion 143 and the second guide portion 133 are both perpendicular to the outer surface of the box wall 13. It can be understood that due to the processing error of the parts and the existence of the matching clearance between the first guide portion 143 and the second guide portion 133, the explosion-proof valve 14 moves in a direction substantially perpendicular to the outer surface of the box wall 13 during the process of opening and closing the valve.

[0082] By providing a first guide portion and a second guide portion that cooperate with each other, the movement direction of the explosion-proof valve 14 can be guided, which can prevent the jamming caused by uneven force when opening or closing the valve to a certain extent, thereby improving the reliability of the explosion-proof valve 14.

[0083] According to some embodiments of the present application, Figures 3 to 5 As shown, the first guide portion 143 is at least one guide rod 1431, and the extension direction of the guide rod 1431 is perpendicular to the outer surface of the box wall 13; the second guide portion 133 is at least one guide hole 1331, and at least one guide hole 1331 is arranged in a one-to-one correspondence with at least one guide rod 1431.

[0084] The guide rod 1431 may be a rod-shaped structure spaced apart from the guide rod 142 and parallel to each other. The number of guide rods 1431 may be multiple, and the multiple guide rods 1431 may be evenly arranged along the circumferential direction with the position of the guide rod 142 as the center. Correspondingly, the guide hole 1331 may be a through hole spaced apart from the mounting hole 131 and penetrating the box wall 13.

[0085] By providing the guide rod 1431 and the guide hole 1331 , the moving direction of the explosion-proof valve body 141 can be restricted, thereby achieving uniform and reliable valve opening and closing.

[0086] See also Figure 6 and Figure 7 , Figure 6 Schematic diagram of the structure of the box wall and explosion-proof valve of other embodiments of the present application; Figure 7 Schematic diagram of the structure of explosion-proof valves in other embodiments of the present application.

[0087] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, the first guide portion 143 is disposed on the circumferential surface of the guide rod 142 , and the second guide portion 133 is disposed in the mounting hole 141 .

[0088] The first guide portion 143 may be a guide structure located on the circumferential surface of the guide rod 142, and the corresponding second guide portion 133 is a guide structure formed on the mounting hole 141. The circumferential surface of the guide rod 142 refers to a surface parallel to the extension center line of the guide rod 142.

[0089] In some embodiments, the first guide portion 143 may be integrally formed with the guide rod 142 .

[0090] Disposing the first guide portion 143 on the circumferential surface of the guide rod 142 can simplify the arrangement of the guide structure and facilitate the processing and installation of the explosion-proof valve 14 .

[0091] According to some embodiments of the present application, Figure 6 As shown, the first guide portion 143 is a protrusion 1424 protruding from the circumferential surface of the guide rod 142 , and the second guide portion 133 is a groove 134 on the mounting hole 131 adapted to the protrusion 1424 .

[0092] The protrusion 1424 protrudes radially from the circumferential surface of the guide rod 142, and the protrusion 1424 extends in a direction perpendicular to the outer surface of the box wall 13. The groove 134 can be a notch on the mounting hole 131 to allow the protrusion 1424 to pass through in a direction perpendicular to the outer surface of the box wall 13.

[0093] The number of the protrusion 1424 can be one or a plurality of protrusions 1424 arranged at intervals. The number of the grooves 134 is the same as the number of the protrusions 1424 .

[0094] By providing the protrusion 1424 on the circumferential surface of the guide rod 142 , the movement direction of the guide rod 142 can be simultaneously limited, thereby improving the stability and reliability of the explosion-proof valve 14 when opening the valve.

[0095] According to some embodiments of the present application, Figure 7 As shown, the cross section of the guide rod 142 is a polygon, and the mounting hole 131 is a polygonal hole whose shape matches the cross section of the guide rod 142 .

[0096] The main body 1421 of the guide rod 142 may be a rod-shaped structure with a polygonal cross section, so that the polygonal circumferential surface of the guide rod 142 can serve as the first guide portion 143, and the corresponding mounting hole 131 is a polygonal hole and serves as the second guide portion 133, and the guiding function is achieved by the contact between the circumferential surface of the guide rod 142 and the mounting hole 131. The cross section of the guide rod 142 may be a regular polygon.

[0097] In this embodiment, the circumferential surface of the guide rod 142 is directly used as the first guide portion 143, which can further simplify the structure of the explosion-proof valve 14 and reduce the manufacturing cost and assembly difficulty.

[0098] According to some embodiments of the present application, Figure 3 As shown, the battery box 10 further includes a sealing member 16 , which is located between the box wall 13 and the explosion-proof valve 14 to seal the gap between the box wall 13 and the explosion-proof valve 14 .

[0099] The seal 16 may be an O-ring disposed around the vent hole 132, and the seal 16 is sandwiched between the box wall 13 and the explosion-proof valve 14. In some embodiments, the seal 16 may be disposed together with the box wall 13 or the explosion-proof valve 14, so that when the explosion-proof valve body 141 is attached to the outer surface of the box wall 13, the docking surface can be sealed.

[0100] The sealing member 16 can be provided to further improve the reliability of the explosion-proof valve 14 in closing the vent hole 132 , thereby improving the sealing performance of the battery box 10 and the reliability of the pressure relief function.

[0101] According to some embodiments of the present application, a sealing groove 144 is provided on the outer surface of the box wall 13 or one of the side surfaces of the explosion-proof valve 14 facing the box wall 13 , and the sealing groove 144 is used to accommodate the sealing member 16 .

[0102] like Figure 2 As shown, a sealing groove 144 is provided on one side surface of the explosion-proof valve body 142 of the explosion-proof valve 14 facing the box wall 13 , and the shape of the sealing groove 144 is adapted to the sealing member 16 for accommodating the sealing member 16 .

[0103] By providing a sealing groove 144 on the outer surface of the box wall 13 or one of the surfaces of the explosion-proof valve 14 facing the box wall 13, the sealing member 16 can be more reliably supported to perform sealing, thereby improving the reliability of the sealing.

[0104] An embodiment of the present application provides a battery, which includes the battery case 10 as described above.

[0105] The battery may also include a battery cell in the battery case 10. When thermal runaway occurs in the battery cell in the battery case 10, the internal gas can be discharged through the explosion-proof valve 14 on the case wall 13 of the battery case 10 to maintain the pressure balance inside and outside the battery, thereby improving the safety of the battery to a certain extent.

[0106] An embodiment of the present application provides an electrical device, including the battery as described above, and the battery is used to provide electrical energy.

[0107] The battery box 10 of the present application is further described below in conjunction with a specific embodiment. Figure 2-Figure 7 As shown, the battery case 10 includes a case wall 13, an explosion-proof valve 14 and an elastic locking member 15, wherein the case wall 13 includes a mounting hole 131 and a vent hole 132; the explosion-proof valve 14 is connected to the elastic locking member 15 via the mounting hole 131, and the elastic locking member 15 is constructed to make the explosion-proof valve 14 fit against the case wall 13 to close the vent hole 132.

[0108] The explosion-proof valve 14 includes an explosion-proof valve body 141 and a guide rod 142, wherein the first end of the guide rod 142 is fixedly connected to the explosion-proof valve body 141, and the second end of the guide rod 142 passes through the mounting hole 131 and is connected to the elastic locking member 15; the elastic locking member 15 includes a limiting member 151 and an elastic member 152, wherein the limiting member 151 is connected to the second end of the guide rod 142; the two ends of the elastic member 152 respectively abut against the limiting member 151 and the inner surface of the box wall 13, so that the explosion-proof valve body 141 fits the outer surface of the box wall 13 and closes the vent hole 132. The limiting member 151 may be a nut, and the elastic member 152 may be a spring. The mounting portion 1422 is threadedly connected to the limiting member 151.

[0109] The guide rod 142 includes a main body 1421 and a mounting portion 1422 located at the second end, the mounting portion 1422 is used to connect with the limiting member 151, the projection of the mounting portion 1422 on the explosion-proof valve body 141 completely falls within the projection of the main body 1421 on the explosion-proof valve body 141, and the projection area of ​​the mounting portion 1422 on the explosion-proof valve body 141 is smaller than the projection area of ​​the main body 1421 on the explosion-proof valve body 141. The step surface formed at the junction of the mounting portion 1422 and the main body 1421 serves as a limiting portion 1423 for abutting against the limiting member 151.

[0110] The explosion-proof valve 14 includes a first guide portion 143 , and the box wall 13 is provided with a second guide portion 133 corresponding to the first guide portion 143 . The first guide portion 143 cooperates with the second guide portion 133 to guide the explosion-proof valve 14 to move in a direction substantially perpendicular to the outer surface of the box wall 13 .

[0111] In some embodiments, the first guide portion 143 is at least one guide rod 1431, and the extension direction of the guide rod 1431 is perpendicular to the outer surface of the box wall 13; the second guide portion 133 is at least one guide hole 1331, and at least one guide hole 1331 is arranged in a one-to-one correspondence with at least one guide rod 1431.

[0112] In some embodiments, the first guide portion 143 is a protrusion 1424 protruding from the circumferential surface of the guide rod 142 , and the second guide portion 133 is a groove 134 on the mounting hole 131 adapted to the protrusion 1424 .

[0113] In some embodiments, the cross section of the guide rod 142 is polygonal, and the mounting hole 131 is a polygonal hole whose shape matches the cross section of the guide rod 142. The guide rod 142 has a polygonal circumferential surface that can serve as the first guide portion 143, and the corresponding mounting hole 131 is a polygonal hole and serves as the second guide portion 133.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery box, characterized in that: include: The wall of the box, including mounting holes and vent holes; explosion proof valves, and An elastic locking component, the explosion-proof valve is connected to the elastic locking component through the mounting hole, and the elastic locking component is configured to make the explosion-proof valve fit against the wall of the box body to close the vent hole.

2. The battery box according to claim 1, characterized in that: The explosion-proof valve comprises an explosion-proof valve body and a guide rod, wherein a first end of the guide rod is fixedly connected to the explosion-proof valve body, and a second end of the guide rod passes through the mounting hole and is connected to the elastic locking member; Wherein, the explosion-proof valve body is attached to the outer surface of the box wall and closes the vent hole under the action of the elastic locking component.

3. The battery box according to claim 2, characterized in that: The elastic locking member comprises: a limiting member connected to the second end of the guide rod; and An elastic component, two ends of which respectively abut against the limiting component and the inner surface of the box wall, so that the explosion-proof valve body fits the outer surface of the box wall and closes the vent hole.

4. The battery box according to claim 3, characterized in that: The guide rod includes a main body and a mounting portion located at the second end, the mounting portion is used to be connected to the limiting member, and a limiting portion for limiting the limiting member is formed at the junction of the mounting portion and the main body.

5. The battery case according to claim 4, characterized in that: The projection of the mounting portion on the explosion-proof valve body completely falls within the projection of the main body on the explosion-proof valve body, and the projection area of ​​the mounting portion on the explosion-proof valve body is smaller than the projection area of ​​the main body on the explosion-proof valve body, so that a step surface serving as the limiting portion is formed at the junction of the mounting portion and the main body.

6. The battery case according to claim 4, characterized in that: The mounting portion is detachably connected to the limiting member.

7. The battery case according to any one of claims 1 to 6, characterized in that: The explosion-proof valve comprises a first guide portion, the box wall is provided with a second guide portion corresponding to the first guide portion, and the first guide portion cooperates with the second guide portion to guide the explosion-proof valve to move in a direction substantially perpendicular to the outer surface of the box wall.

8. The battery case according to claim 7, characterized in that: The first guide portion is at least one guide rod, and the extension direction of the guide rod is perpendicular to the outer surface of the box wall; the second guide portion is at least one guide hole, and the at least one guide hole is arranged in a one-to-one correspondence with the at least one guide rod.

9. The battery case according to claim 7, characterized in that: The explosion-proof valve comprises an explosion-proof valve body and a guide rod, wherein the guide rod is connected to the explosion-proof valve body and the elastic locking member through the mounting hole. Wherein, the first guide portion is arranged on the circumferential surface of the guide rod, and the second guide portion is arranged on the mounting hole.

10. The battery case according to claim 9, characterized in that: The first guide portion is a convex block protruding from the circumferential surface of the guide rod, and the second guide portion is a groove on the mounting hole adapted to the convex block.

11. The battery case according to claim 9, characterized in that: The cross section of the guide rod is a polygon, and the mounting hole is a polygonal hole whose shape matches the cross section of the guide rod.

12. The battery case according to any one of claims 1 to 6, characterized in that: Also includes: A sealing member is located between the box wall and the explosion-proof valve to seal the gap between the box wall and the explosion-proof valve.

13. The battery case according to claim 12, characterized in that: A sealing groove is provided on one of the outer surface of the box wall or the surface of the explosion-proof valve facing the box wall, and the sealing groove is used to accommodate the sealing member.

14. A battery, characterized in that: Comprising a battery case as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 14, wherein the battery is used to provide electrical energy.

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