Battery explosion-proof valve protection structure and battery

Abstract

The application provides a battery explosion-proof valve protection structure and a battery, and relates to the technical field of batteries. The battery explosion-proof valve protection structure comprises a first cover and a second cover. The first cover is arranged on at least one battery explosion-proof valve and cooperates with the battery to define a first cavity; the second cover is arranged on at least one first cover and cooperates with the first cover to define a second cavity. The first cover is provided with a first through hole to communicate the first cavity and the second cavity, and the second cover is provided with a second through hole. The first through hole and the second through hole are arranged staggeredly and are located on one side of the radial direction of the exhaust port of the explosion-proof valve. Once the battery is in thermal runaway, the high-temperature gas discharged from the explosion-proof valve will pass through the exhaust channel defined by the first cavity, the first through hole, the second cavity and the second through hole, and the discharge of the high-temperature gas is directional and cannot be sprayed without direction, thereby reducing the harm of the high-temperature gas after being discharged, avoiding personnel injury to a certain extent and improving the use safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery explosion-proof valve protection structure and a battery. Background Technology

[0002] With the widespread application of batteries in automobiles and energy storage, battery safety performance is a crucial indicator for battery evaluation. Explosion-proof valves, as safety components, are typically installed on the battery box. Their main function is to open promptly to release pressure in the event of battery failure and gas generation, ensuring that the internal pressure of the battery does not become too high and lead to an explosion.

[0003] However, when a battery experiences thermal runaway, the high-temperature gas inside the battery box will be ejected in all directions through the explosion-proof valve, which can easily cause personal injury and has poor safety. Utility Model Content

[0004] This application provides a battery explosion-proof valve protection structure and battery to improve the problem of the explosion-proof valve spraying high-temperature gas in all directions after the battery experiences thermal runaway, thereby avoiding personal injury to a certain extent and improving the safety of use.

[0005] In a first aspect, this application provides a battery explosion-proof valve protection structure, including a first cover and a second cover. The first cover is used to at least cover the battery explosion-proof valve and, together with the battery, defines a first cavity; the second cover is at least covered on the side of the first cover opposite to the battery, and, together with the first cover, defines a second cavity. The first cover has a first through hole to communicate between the first cavity and the second cavity, and the second cover has a second through hole to communicate with the outside. The first through hole and the second through hole are staggered and both are located on one radial side of the exhaust port of the explosion-proof valve.

[0006] The battery explosion-proof valve protection structure provided in this application comprises a first cover and a second cover. The first cover is placed over the battery's explosion-proof valve, defining a sealed first cavity between the first cover and the battery. The second cover is placed over at least the side of the first cover facing away from the battery, defining a sealed second cavity with the first cover. A first through-hole is formed on the first cover, connecting the first cavity and the second cavity, and the first through-hole is located on one radial side of the explosion-proof valve's exhaust port. A second through-hole is formed on the second cover, communicating with the outside. The second through-hole and the first through-hole are staggered and located on one radial side of the explosion-proof valve's exhaust port. Since the explosion-proof valve is located in the first cavity, and the first cavity communicates with the second cavity through the first through-hole, and the second cavity communicates with the outside through the second through-hole, the first cavity, the first through-hole, the second cavity, and the second through-hole form a discharge channel, enabling the battery explosion-proof valve protection structure of this application to collect and guide the high-temperature gas discharged from the explosion-proof valve. Therefore, once a battery experiences thermal runaway, the high-temperature gas inside the battery will be discharged through the exhaust channel defined by the first cavity, the first through hole, the second cavity, and the second through hole after being discharged from the explosion-proof valve. In other words, the high-temperature gas generated by the battery failure will be discharged along the preset exhaust channel inside the casing, making the discharge of high-temperature gas directional and preventing it from being sprayed in an undirected manner. This reduces the harm caused by the discharge of high-temperature gas, avoids personal injury to a certain extent, and improves the safety of use.

[0007] Furthermore, after the high-temperature gas is ejected from the explosion-proof valve and enters the first chamber, it collides with the first cover, which cools and slows it down. After the high-temperature gas in the first chamber is ejected from the first through hole and enters the second chamber, it collides with the second cover, which cools and slows it down a second time. In other words, during the flow of the high-temperature gas along the preset emission channel, both the first and second covers cool and slow down the high-temperature gas. Compared with the solution of directly venting the high-temperature gas to the outside through the explosion-proof valve, this reduces the energy, speed, and pressure of the high-temperature gas when it is vented to the outside, thereby further reducing the hazards after the high-temperature gas is vented and further improving the safety of use.

[0008] Meanwhile, since the first and second through holes are staggered, the high-temperature gas entering the second cavity through the first through hole will not be directly discharged through the second through hole. This increases the path of the high-temperature gas between the first and second through holes and prolongs the flow time of the high-temperature gas in the second cavity. As a result, the second cover has a better cooling and deceleration effect on the high-temperature gas, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0009] In one possible design, the first through hole and the second through hole are located on the same side of the explosion-proof valve; Both the first and second through holes are located below the explosion-proof valve.

[0010] With the above scheme, the first through hole and the second through hole are arranged on the same side of the radial direction of the exhaust port of the explosion-proof valve. In this way, after the high temperature gas enters the second cavity from the first through hole, it can be discharged to the outside through the second through hole more quickly. The discharge efficiency is high, which helps the battery to depressurize quickly when thermal runaway occurs, thereby avoiding the occurrence of battery fire, explosion and other phenomena.

[0011] By placing both the first and second through holes below the explosion-proof valve, the high-temperature gas is discharged downwards after passing through both holes, improving emission safety. Furthermore, if the high-temperature gas carries particles, the particles are more easily discharged under gravity, enhancing the convenience of particle emission.

[0012] In one possible design, the first through hole and the second through hole are located on opposite sides of the explosion-proof valve. The first and second through holes are located on both sides of the explosion-proof valve along the radial direction of the exhaust port.

[0013] With the above scheme, the first through hole and the second through hole are respectively located on both sides of the explosion-proof valve, that is, the first through hole and the second through hole are respectively located on both sides of the center line of the exhaust port. This arrangement increases the path of the high-temperature gas between the first through hole and the second through hole, prolongs the flow time of the high-temperature gas in the second cavity, and makes the cooling and deceleration effect of the second cover on the high-temperature gas better, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0014] In one possible design, the side of the second casing located radially above the exhaust port is an open opening, which forms a second through hole.

[0015] The above scheme sets the radial side of the second cover above the exhaust port as an open opening, which is the second through hole. This facilitates the discharge of high-temperature gas in the second cavity, improves the discharge efficiency of high-temperature gas, and allows the high-temperature gas generated by battery failure to be discharged in time. This ensures timely depressurization of the battery, high depressurization efficiency, avoids battery fire and explosion, and further guarantees safety.

[0016] In one possible design, the orthogonal projection of the first through-hole onto the battery is offset from that of the explosion-proof valve.

[0017] By using the above scheme, the projection of the first through hole onto the battery is offset from that of the explosion-proof valve. This prevents the high-temperature gas entering the first chamber through the explosion-proof valve from being directly discharged into the second chamber through the first through hole. This increases the path of the high-temperature gas between the exhaust port of the explosion-proof valve and the first through hole, and prolongs the flow time of the high-temperature gas in the first chamber. As a result, the first cover has a better cooling and deceleration effect on the high-temperature gas, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0018] In one possible design, the first housing includes a housing body and two support plates. The two support plates are positioned opposite each other and spaced apart. The housing body is located between the two support plates and connected to the side of the two support plates facing the second housing. The two support plates, the side of the housing body facing away from the second housing, and the outer wall of the battery together define a first cavity. A first through hole is formed on the housing body.

[0019] With the above design, the first housing includes a housing body and two support plates. The housing body, together with the outer wall of the battery, defines the first cavity. This design is simple in structure, easy to manufacture, and provides good sealing. Furthermore, the first through-hole is located on the housing body, allowing high-temperature gas to be effectively ejected from the outlet of the first through-hole onto the inner wall of the second housing, thus improving the deceleration effect of the second housing on the high-temperature gas.

[0020] In one possible design, the cover includes a first cover section and a second cover section. The first cover section and the second cover section are respectively located on both sides of the center line of the exhaust port, and in the direction from the side of the cover facing the battery to the side of the cover facing away from the battery, the first cover section and the second cover section are inclined towards each other. A first through hole is opened on the first cover section or the second cover section, and the angle between the first cover section or the second cover section where the first through hole is located and the outer wall of the battery facing the first cavity is 20°-60°.

[0021] The above scheme divides the cover into a first cover section and a second cover section. The first cover section and the second cover section are arranged on both sides of the center line of the exhaust port. Moreover, along the side of the cover facing the battery to the side of the cover away from the battery, that is, along the spray direction of the exhaust port, the first cover section and the second cover section are inclined towards each other. In this way, the cover has a certain gathering effect on the high temperature gas, so that the high temperature gas has a larger collision area with the first cover after being sprayed from the explosion-proof valve into the first cavity, thereby enabling the cover to better cool and decelerate the high temperature gas.

[0022] In one possible design, there are at least two explosion-proof valves, and the battery explosion-proof valve protection structure also includes at least one partition. The partition is disposed in the first cavity to divide the first cavity into at least two sub-cavities, each sub-cavity communicating with the second cavity through a first through hole, and one sub-cavity corresponding to one explosion-proof valve.

[0023] With the above solution, when the battery is equipped with at least two explosion-proof valves, the battery explosion-proof valve protection structure of this application also includes at least one partition in the first cavity. The partition divides the first cavity into at least two sub-cavities, and an explosion-proof valve can be arranged in each sub-cavity. In this way, the battery explosion-proof valves can be arranged in different sub-cavities. That is, each explosion-proof valve is in its corresponding sub-cavity. With this arrangement, the partition isolates two adjacent explosion-proof valves, so that the high-temperature gas discharged from each explosion-proof valve has a preset discharge path in the first cavity, thereby avoiding the interference and resonance of high-temperature gas generated by multiple explosion-proof valves, and improving safety.

[0024] In one possible design, the first through hole includes at least two sub-holes, which are spaced apart along the arrangement direction of the plurality of explosion-proof valves, and each sub-cavity is provided with at least one sub-hole.

[0025] The above scheme involves setting multiple sub-holes on the separator, with these sub-holes spaced apart along the arrangement direction of the multiple explosion-proof valves, ensuring that each sub-cavity has at least one sub-hole. In this way, each sub-cavity is connected to the second cavity through its corresponding sub-hole, allowing the high-temperature gas discharged from each explosion-proof valve to enter the second cavity through its corresponding sub-hole, resulting in orderly discharge and higher safety.

[0026] In one possible design, the battery explosion-proof valve protection structure also includes a sealing plate. The sealing plate covers the battery-facing side of the first housing and the battery-facing side of the second housing, and the sealing plate has a clearance opening at the position corresponding to the explosion-proof valve for the explosion-proof valve to extend into the first cavity. The sealing plate is connected to at least one of the first housing, the second housing, and the battery.

[0027] With the above solution, a sealing plate is arranged on the side of the first and second covers facing the battery to seal the first and second cavities. The sealing plate has an opening at the position corresponding to the explosion-proof valve for the explosion-proof valve to pass through. The sealing plate not only improves the sealing performance of the first and second cavities and further ensures that high-temperature gas is discharged along the preset emission channel, but also enhances the structural strength of the first and second covers, which helps to extend the service life of the battery explosion-proof valve protection structure of this application.

[0028] Secondly, this application provides a battery, including a battery explosion-proof valve protection structure.

[0029] The beneficial effects of the battery provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0030] Figure 1This is an exploded view of a battery according to an embodiment of this application.

[0031] Figure 2 This is an isometric view of a battery according to an embodiment of this application.

[0032] Figure 3 This is an assembly diagram of a battery according to an embodiment of this application.

[0033] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0034] Figure 5 This is a partial structural schematic diagram of another assembly drawing of the battery according to an embodiment of this application.

[0035] Figure 6 Axonometric view of the battery explosion-proof valve protection structure according to an embodiment of this application. Figure 1 .

[0036] Figure 7 This is an isometric view of the first section of the battery explosion-proof valve protection structure according to an embodiment of this application.

[0037] Figure 8 This is an isometric view of the first section of the battery explosion-proof valve protection structure according to an embodiment of this application.

[0038] Figure 9 Axonometric view of the battery explosion-proof valve protection structure according to an embodiment of this application. Figure 2 .

[0039] Figure 10 Axonometric view of the battery explosion-proof valve protection structure according to an embodiment of this application. Figure 3 .

[0040] Figure 11 Axonometric view of the battery explosion-proof valve protection structure according to an embodiment of this application. Figure 4 .

[0041] Figure 12 Axonometric view of the battery explosion-proof valve protection structure according to an embodiment of this application. Figure 5 .

[0042] Explanation of reference numerals in the attached drawings: 100, Battery explosion-proof valve protection structure; 1, First cover; 11, Cover body; 111, First cover section; 112, Second cover section; 12, Support plate; 2, Second cover; 3, First cavity; 31, Sub-cavity; 4, Second cavity; 5, First through hole; 51, Sub-hole; 6, Second through hole; 7, Separator; 8, Sealing plate; 81, Circumvention opening; 200, Battery; 201, Explosion-proof valve; 202, Box body; 203, Battery cell. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0045] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the battery explosion-proof valve protection structure or the battery of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0049] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] With the widespread application of batteries in automobiles and energy storage, battery safety performance is a crucial indicator for battery evaluation. Explosion-proof valves, as safety components, are typically installed on the battery box. Their main function is to open promptly to release pressure in the event of battery failure and gas generation, ensuring that the internal pressure of the battery does not become too high and lead to an explosion.

[0052] However, when a battery experiences thermal runaway, the high-temperature gas inside the battery box will be ejected in all directions through the explosion-proof valve, which can easily cause personal injury and has poor safety.

[0053] Based on this, this embodiment provides a battery explosion-proof valve protection structure and a battery. By providing a first cover and a second cover, the first cover at least covers the battery's explosion-proof valve, defining a sealed first cavity between the first cover and the battery. The second cover covers at least a portion of the first cover on the side facing away from the battery, and the second cover, together with the first cover, defines a sealed second cavity. A first through-hole is formed in the first cover, through which the first cavity and the second cavity communicate, and the first through-hole is located on one radially side of the explosion-proof valve's exhaust port. A second through-hole communicating with the outside is formed in the second cover, staggered from the first through-hole, and located on one radially side of the explosion-proof valve's exhaust port. Therefore, once a battery experiences thermal runaway, the high-temperature gas inside the battery will be discharged through the exhaust channel defined by the first cavity, the first through hole, the second cavity, and the second through hole after being discharged from the explosion-proof valve. In other words, the high-temperature gas generated by the battery failure will be discharged along the preset exhaust channel inside the casing, making the discharge of the high-temperature gas directional rather than a random jet. This reduces the harm caused by the discharge of high-temperature gas, avoids personal injury to a certain extent, and improves the safety of use.

[0054] The following detailed description, with reference to the accompanying drawings, of a battery explosion-proof valve protection structure and a battery provided in this embodiment through specific examples, will be provided in detail.

[0055] refer to Figures 1 to 4 As shown, this embodiment provides a battery 200, which includes an explosion-proof valve 201, a housing 202, a battery cell 203, and a battery explosion-proof valve protection structure 100.

[0056] The battery cell 203 is installed inside the housing 202, and the explosion-proof valve 201 is installed on one side of the housing 202. The side of the explosion-proof valve 201 facing away from the battery cell 203 is exposed outside the housing 202.

[0057] The battery explosion-proof valve protection structure 100 covers at least the explosion-proof valve 201 and is sealed to the housing 202. The battery explosion-proof valve protection structure 100 isolates the explosion-proof valve 201 from the outside, protecting the explosion-proof valve 201. In the event of thermal runaway of the battery 200, it also gathers and guides the high-temperature gas discharged from the explosion-proof valve 201, making the discharge of the high-temperature gas directional.

[0058] In practical use, if the battery 200 experiences thermal runaway, the explosion-proof valve 201 will open, and the high-temperature gas inside the housing 202 will flow from the explosion-proof valve 201 into the battery explosion-proof valve protection structure 100, and be discharged along the preset discharge channel inside the battery explosion-proof valve protection structure 100. This makes the discharge of high-temperature gas directional, so that the high-temperature gas will not be sprayed in an undirected manner, thereby reducing the hazards after the high-temperature gas is discharged, avoiding personal injury to a certain extent, and improving the safety of use.

[0059] refer to Figures 1 to 7 As shown, this embodiment provides a battery explosion-proof valve protection structure 100, which includes a first cover 1 and a second cover 2.

[0060] For details, please refer to Figures 2 to 4 As shown, the first cover 1 is used to cover at least the explosion-proof valve 201 of the battery 200, and together with the battery 200, defines the first cavity 3; the second cover 2 is at least covered on the side of the first cover 1 away from the battery 200, and together with the first cover 1, defines the second cavity 4. The first cover 1 has a first through hole 5 to communicate with the first cavity 3 and the second cavity 4, and the second cover 2 has a second through hole 6 to communicate with the outside. The first through hole 5 and the second through hole 6 are staggered and are both located on one side of the radial direction of the exhaust port of the explosion-proof valve 201.

[0061] In some implementations, the first cover 1 and the second cover 11 can be integrally formed, which has good integrity and high structural strength, and at the same time facilitates the assembly of the battery explosion-proof valve protection structure 100 on the battery 200.

[0062] For example, the second cover 11 may be provided with a connecting ear (not shown). The connecting ear may be fixed to the housing 202 by means of welding, bolt connection or other methods. In this way, the first cover 1 and the second cover 2 can be installed on the battery 200 together with only one assembly, which is convenient and efficient.

[0063] In some other implementations, the first housing 1 and the second housing 2 may also be connected to the battery 200, for example.

[0064] During specific assembly, a sealing element, such as a sealing strip, can be provided at the joint between the first cover 1 and the battery 200. The sealing element is arranged circumferentially between the first cover 1 and the battery 200, so that the connection between the first cover 1 and the battery 200 is well sealed, which improves the sealing performance of the first cavity 3. The high-temperature gas in the first cavity 3 can only enter the second cavity 4 through the first through hole 5.

[0065] Of course, a sealing strip can also be provided at the junction of the second cover 2 and the battery 200 to improve the sealing of the second cavity 4. The high-temperature gas in the second cavity 4 can only be discharged to the outside through the second through hole 6.

[0066] For specific implementation, refer to Figure 4As shown, the circumferential dimension of the first cover 1 can be larger than that of the explosion-proof valve 201. The first cover 11 not only covers the explosion-proof valve 201, but also covers the outer wall surface of the housing 202 near the explosion-proof valve 201. Of course, in other implementations, the circumferential dimension of the first cover 1 can also be the same as that of the explosion-proof valve 201, and the first cover 1 only covers the explosion-proof valve 201.

[0067] refer to Figure 4 As shown, the circumferential dimension of the second cover 2 can be larger than that of the first cover 1. The second cover 11 not only covers the first cover 1, but also covers the outer wall surface of the housing 202 near the first cover 1. Of course, in other implementations, the circumferential dimension of the second cover 2 can also be the same as that of the first cover 1, and the second cover 2 only covers the first cover 1.

[0068] In some implementations, the first through hole 5 can be a strip-shaped hole, and the length direction of the strip-shaped hole can intersect the center line of the exhaust port of the explosion-proof valve 201. The opening area of ​​the first through hole 5 is larger than the opening area of ​​the exhaust port, so that high-temperature gas can enter the second chamber 4 from the first chamber 3, ensuring the pressure relief efficiency of the battery 200.

[0069] Of course, in other implementations, the first through hole 5 can also be a circular hole, a diamond-shaped hole, etc.

[0070] For specific implementation, refer to Figure 4 and Figure 6 As shown, the second through hole 6 can be opened on the side wall of the second cover 2 located radially above the exhaust port, so that high-temperature gas can be discharged from the second cavity 4 to the outside.

[0071] Of course, the second housing 2 has a cavity wall opposite to the side where the explosion-proof valve 201 is located, and the second through hole 6 can also be opened on the cavity wall, for example.

[0072] The opening area of ​​the second through hole 6 is larger than the opening area of ​​the exhaust port, which facilitates the discharge of high-temperature gas from the second cavity 4 and ensures the pressure relief efficiency of the battery 200.

[0073] The battery explosion-proof valve protection structure 100 provided in this embodiment includes a first cover 1 and a second cover 2. The first cover 1 covers the explosion-proof valve 201 of the battery 200, defining a sealed first cavity 3 between the first cover 1 and the battery 200. The second cover 2 covers at least the side of the first cover 1 opposite to the battery 200, defining a sealed second cavity 4 between the second cover 2 and the first cover 1. A first through hole 5 is provided on the first cover 1 to connect the first cavity 3 and the second cavity 4, and the first through hole 5 is located on one side of the radial direction of the exhaust port of the explosion-proof valve 201. A second through hole 6 communicating with the outside is provided on the second cover 2. The second through hole 6 and the first through hole 5 are staggered and located on one side of the radial direction of the exhaust port of the explosion-proof valve 201. Since the explosion-proof valve 201 is located inside the first cavity 3, and the first cavity 3 is connected to the second cavity 4 through the first through hole 5, and the second cavity 4 is connected to the outside through the second through hole 6, the first cavity 3, the first through hole 5, the second cavity 4, and the second through hole 6 form a discharge channel. This allows the battery explosion-proof valve protection structure 100 of this embodiment to collect and guide the high-temperature gas discharged from the explosion-proof valve 201. Therefore, once the battery 200 experiences thermal runaway, the high-temperature gas inside the battery 200, after being discharged from the explosion-proof valve 201, will be discharged through the discharge channel jointly defined by the first cavity 3, the first through hole 5, the second cavity 4, and the second through hole 6. In other words, the high-temperature gas generated by the failure of the battery 200 will be discharged along the preset discharge channel inside the casing, making the discharge of the high-temperature gas directional and preventing it from spraying out randomly. This reduces the hazards after the high-temperature gas is discharged, avoids personal injury to a certain extent, and improves the safety of use.

[0074] Furthermore, refer to Figure 4 As shown by curve S, after the high-temperature gas is ejected from the explosion-proof valve 201, it enters the first chamber 3 and collides with the first cover 1, which cools and decelerates it once. After the high-temperature gas in the first chamber 3 is ejected from the first through hole 5, it enters the second chamber 4 and collides with the second cover 2, which cools and decelerates it a second time. In other words, during the flow of the high-temperature gas along the preset emission channel, both the first cover 1 and the second cover 2 play a role in cooling and decelerating the high-temperature gas. Compared with the scheme of directly venting the high-temperature gas to the outside through the explosion-proof valve 201, this reduces the energy, speed and pressure of the high-temperature gas when it is vented to the outside, thereby further reducing the hazards after the high-temperature gas is vented and further improving the safety of use.

[0075] Meanwhile, since the first through hole 5 and the second through hole 6 are staggered, the high-temperature gas that enters the second cavity 4 through the first through hole 5 will not be directly discharged through the second through hole 6. This increases the path of the high-temperature gas between the first through hole 5 and the second through hole 6 and prolongs the flow time of the high-temperature gas in the second cavity 4. As a result, the second cover 2 has a better cooling and deceleration effect on the high-temperature gas, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0076] In addition, since the second through hole 6 is located on one side of the radial direction of the exhaust port of the explosion-proof valve 201, the high-temperature gas discharged through the second through hole 6 is located on one side of the explosion-proof valve 201. In other words, the high-temperature gas is discharged from the circumferential side of the explosion-proof valve 201, which further ensures the directionality of the high-temperature gas discharge and thus further ensures safety.

[0077] refer to Figure 3 and Figure 4 As shown, in some embodiments, the first through hole 5 and the second through hole 6 are located on the same side of the explosion-proof valve 201, that is, the first through hole 5 and the second through hole 6 are located on the same side of the center line of the exhaust port of the explosion-proof valve 201.

[0078] The first through hole 5 and the second through hole 6 are arranged on the same side of the radial direction of the exhaust port of the explosion-proof valve 201. In this way, after the high temperature gas enters the second cavity 4 through the first through hole 5, it can be discharged to the outside through the second through hole 6 more quickly. The discharge efficiency is high, which helps the battery 200 to depressurize quickly when thermal runaway occurs, thereby avoiding the battery 200 from catching fire or exploding.

[0079] In some embodiments, the first through hole 5 and the second through hole 6 are both located below the explosion-proof valve 201, that is, the first through hole 5 and the second through hole 6 are both located on the side of the explosion-proof valve 201 facing the ground.

[0080] By positioning both the first through-hole 5 and the second through-hole 6 below the explosion-proof valve 201, the high-temperature gas exits downwards, i.e., towards the ground, after passing through both through-holes 5 and 6, thus improving emission safety. Furthermore, if the high-temperature gas carries particles, the particles are more easily discharged under gravity, enhancing the convenience of particle emission.

[0081] In other embodiments, depending on actual working conditions, the first through hole 5 and the second through hole 6 are located above the center line of the exhaust port of the explosion-proof valve 201.

[0082] In some embodiments, reference Figure 5 As shown, the first through hole 5 and the second through hole 6 are respectively located on both sides of the explosion-proof valve 201.

[0083] The first through hole 5 and the second through hole 6 are respectively located on both sides of the explosion-proof valve 201, that is, the first through hole 5 and the second through hole 6 are respectively located on both sides of the center line of the exhaust port. The first through hole 5 and the second through hole 6 have no overlapping part. This arrangement increases the path of the high-temperature gas between the first through hole 5 and the second through hole 6, prolongs the flow time of the high-temperature gas in the second cavity 4, and makes the cooling and deceleration effect of the second cover 2 on the high-temperature gas better, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0084] In practice, the first through hole 5 and the second through hole 6 can be respectively located on both sides of the explosion-proof valve 201 along the radial direction of the exhaust port, so that the path between the first through hole 5 and the second through hole 6 is larger, further extending the flow time of the high-temperature gas in the second cavity 4, and making the cooling and deceleration effect of the second cover 2 on the high-temperature gas better.

[0085] refer to Figures 3 to 7 As shown, in some embodiments, the side of the second housing 2 located radially above the exhaust port is an open opening, which is formed as a second through hole 6.

[0086] The side of the second cover 2 located radially above the exhaust port is set as an open opening, which is the second through hole 6. This facilitates the discharge of high-temperature gas in the second cavity 4, improves the discharge efficiency of high-temperature gas, and enables the high-temperature gas generated by the failure of battery 200 to be discharged in time. This allows the battery 200 to depressurize in a timely manner with high depressurization efficiency, avoiding phenomena such as fire and explosion of battery 200, and further ensuring safety.

[0087] In other embodiments, the side of the second housing 2 located radially above the exhaust port has a blocked cavity wall, and the second through hole 6 is formed on the cavity wall to enable communication between the second cavity 4 and the outside, so that the high-temperature gas entering the second cavity 4 can be discharged to the outside of the second housing 2.

[0088] In some embodiments, the orthographic projection of the first through hole 5 onto the battery 200 is offset from that of the explosion-proof valve 201.

[0089] By setting the projection of the first through hole 5 onto the battery 200 to be offset from the explosion-proof valve 201, the high-temperature gas entering the first cavity 3 through the explosion-proof valve 201 will not be directly discharged into the second cavity 4 through the first through hole 5. This increases the path of the high-temperature gas between the exhaust port of the explosion-proof valve 201 and the first through hole 5, and prolongs the flow time of the high-temperature gas in the first cavity 3. As a result, the first cover 1 has a better cooling and deceleration effect on the high-temperature gas, thereby further reducing the energy, speed and pressure of the high-temperature gas when it is discharged.

[0090] The battery end face where the explosion-proof valve 201 is located has, for example, a length direction and a width direction. In specific implementation, the orthographic projection of the first through hole 5 on this battery end face is offset from that of the explosion-proof valve 201, with no overlap between them. Specifically, looking along the length direction from one side of the battery end face to the other, the orthographic projection of the first through hole 5 on the battery end face does not overlap with that of the explosion-proof valve 201. Similarly, looking along the width direction from one side of the battery end face to the other, the orthographic projection of the first through hole 5 on the battery end face also does not overlap with that of the explosion-proof valve 201.

[0091] refer to Figure 8 As shown, in some embodiments, the first housing 1 includes a cover body 11 and two support plates 12. The two support plates 12 are arranged opposite to each other and spaced apart, and the cover body 11 is located between the two support plates 12. The side of the two support plates 12 facing away from the second housing 2 abuts against the battery 200. The cover body 11 is connected to the side of the two support plates 12 facing the second housing 2. The two support plates 12, the side of the cover body 11 facing away from the second housing 2, and the outer wall of the battery 200 together define the first cavity 3. The first through hole 5 is formed on the cover body 11.

[0092] By including a cover body 11 and two support plates 12 in the first housing 1, the cover body 11, together with the two support plates 12 and the outer wall of the battery 200, defines the first cavity 3. This design is simple, easy to manufacture, and provides good sealing. Furthermore, the first through hole 5 is formed on the cover body 11, allowing high-temperature gas to be effectively ejected from the outlet of the first through hole 5 onto the inner wall of the second housing 2, thus improving the deceleration and cooling effect of the second housing 2 on the high-temperature gas.

[0093] In a specific implementation, the side of the two support plates 12 that is away from the first cavity 3 can be fitted and connected to the second cover 2, so that the second cavity 4 is defined between the cover 11 and the second cover 2. Since the first through hole 5 is opened on the cover 11, this arrangement facilitates the entry of high temperature gas into the second cavity 4.

[0094] The cover 11 and the two support plates 12 can be integrally formed, which has good integrity, high structural strength, and is easy to assemble.

[0095] refer to Figure 4 and Figure 8 As shown, in some embodiments, the cover 11 includes a first cover section 111 and a second cover section 112. The first cover section 111 and the second cover section 112 are respectively disposed on both sides of the center line of the exhaust port, and in the direction along the side of the cover 11 facing the battery 200 to the side of the cover 11 away from the battery 200 (refer to...). Figure 4In the middle, along the X direction from right to left), the first cover section 111 and the second cover section 112 are inclined towards each other, and the first through hole 5 is opened on the first cover section 111 or the second cover section 112, and the angle between the first cover section 111 or the second cover section 112 where the first through hole 5 is located and the outer wall of the battery 200 facing the first cavity 3 (refer to the angle between the first cover section 111 or the second cover section 112 where the first through hole 5 is located and the outer wall of the battery 200 facing the first cavity 3 is (reference) Figure 4 and Figure 5 The α in the value ranges from 20° to 60°.

[0096] By dividing the cover 11 into a first cover section 111 and a second cover section 112, the first cover section 111 and the second cover section 112 are arranged on both sides of the center line of the exhaust port. Moreover, along the side of the cover 11 facing the battery 200 to the side of the cover 11 away from the battery 200, that is, along the spray direction of the exhaust port, the first cover section 111 and the second cover section 112 are inclined towards each other. In this way, the cover 11 has a certain gathering effect on the high temperature gas, so that the high temperature gas has a larger collision area with the first cover 1 after being sprayed from the explosion-proof valve 201 into the first cavity 3, thereby making the cover 11 better at cooling and decelerating the high temperature gas.

[0097] Furthermore, refer to Figure 4 and Figure 5 As shown, along the injection direction of the exhaust port, the first hood section 111 and the second hood section 112 are inclined towards each other. In this way, the inner cavity of the second cavity 4 corresponding to the junction of the first hood section 111 and the second hood section 112 is smaller, the inner cavity of the second cavity 4 corresponding to the first hood section 111 is larger, and the inner cavity of the second cavity 4 corresponding to the second hood section 112 is larger. That is to say, along the direction from the first hood section 111 to the second hood section 112, or along the direction from the second hood section 112 to the first hood section 111, the two ends of the preset channel are thick and the middle is thin. The second cavity 4 is formed as a Venturi tube.

[0098] When the first through hole 5 and the second through hole 6 are respectively located on both sides of the explosion-proof valve 201, for example, refer to Figure 5 As shown, the first through hole 5 is opened on the first cover section 111, and the second through hole 6 is opened at the bottom of the second cover 2. After the high temperature gas enters the second cavity 4 through the first through hole 5, it passes through the Venturi channel and is discharged through the second through hole 6. The discharge efficiency is high, which improves the pressure relief efficiency of the battery 200.

[0099] In some embodiments, reference Figure 9 As shown, when the battery 200 is provided with multiple explosion-proof valves 201, the dimensions of the first cover 1 and the second cover 2 along the arrangement direction of the multiple explosion-proof valves 201 can be made larger. This allows multiple explosion-proof valves 201 to be arranged in the first cavity 3, resulting in a simple structure and easy assembly.

[0100] refer to Figure 10As shown, in some embodiments, there are at least two explosion-proof valves 201, and the battery explosion-proof valve protection structure 100 also includes at least one partition 7. The partition 7 is disposed in the first cavity 3 to divide the first cavity 3 into at least two sub-cavities 31. Each sub-cavity 31 is connected to the second cavity 4 through a first through hole 5, and one sub-cavity 31 corresponds to one explosion-proof valve 201.

[0101] In other words, when the battery 200 is equipped with multiple explosion-proof valves 201, the first cavity 3 can, for example, be equipped with multiple partitions 7. These partitions 7 are spaced apart within the first cavity 3 along the arrangement direction of the multiple explosion-proof valves 201, dividing the first cavity 3 into multiple sub-cavities 31, with each explosion-proof valve 201 corresponding to one sub-cavity 31. After the battery 200 explosion-proof valve 201 structure provided in this embodiment is connected to the battery 200, each explosion-proof valve 201 is located within its corresponding sub-cavity 31.

[0102] The first cavity 3 is divided into at least two sub-cavities 31 by the separator 7, so that each explosion-proof valve 201 is arranged in its corresponding sub-cavity 31. In this way, the multiple explosion-proof valves 201 of the battery 200 can be arranged in different sub-cavities 31. That is, each explosion-proof valve 201 is in its corresponding sub-cavity 31. With this arrangement, the separator 7 isolates two adjacent explosion-proof valves 201, so that the high-temperature gas discharged by each explosion-proof valve 201 has a preset discharge path in the first cavity 3. This avoids the high-temperature gas generated by multiple explosion-proof valves 201 from interfering with each other and causing resonance, thereby improving safety.

[0103] For example, the battery 200 has two explosion-proof valves 201, and a partition 7 is provided in the first cavity 3, which divides the first cavity 3 into two sub-cavities 31, and the two explosion-proof valves 201 are respectively located in the two sub-cavities 31.

[0104] In other embodiments, when multiple explosion-proof valves are provided on the battery, the battery explosion-proof valve protection structure includes multiple first covers, which are arranged along the arrangement direction of the multiple explosion-proof valves, and adjacent first covers are fitted together, with one explosion-proof valve located inside one first cover.

[0105] refer to Figure 10 As shown, in some embodiments, the first through hole 5 includes at least two sub-holes 51, which are spaced apart along the arrangement direction of the plurality of explosion-proof valves 201, and each sub-cavity 31 is provided with at least one sub-hole 51.

[0106] By setting multiple sub-holes 51 on the separator 7, and the multiple sub-holes 51 are spaced apart along the arrangement direction of the multiple explosion-proof valves 201, each sub-cavity 31 has at least one sub-hole 51. In this way, each sub-cavity 31 is connected to the second cavity 4 through its corresponding sub-hole 51, so that the high-temperature gas discharged from each explosion-proof valve 201 can enter the second cavity 4 through the corresponding sub-hole 51, resulting in orderly discharge and higher safety.

[0107] refer to Figure 11 and Figure 12 As shown, in some embodiments, the battery explosion-proof valve protection structure 100 further includes a sealing plate 8. The sealing plate 8 covers the side of the first housing 1 facing the battery 200 and the side of the second housing 2 facing the battery 200, and the sealing plate 8 has a clearance opening 81 at the position corresponding to the explosion-proof valve 201 for the explosion-proof valve 201 to extend into the first cavity 3. The sealing plate 8 is connected to at least one of the first housing 1, the second housing 2, and the battery 200.

[0108] By arranging sealing plates 8 on the side of the first housing 1 and the second housing 2 facing the battery 200, the first cavity 3 and the second cavity 4 are sealed by the sealing plates 8. The sealing plates 8 are provided with a clearance opening 81 for the explosion-proof valve 201 to pass through at the position corresponding to the explosion-proof valve 201. The setting of the sealing plates 8 not only improves the sealing performance of the first cavity 3 and the second cavity 4, further ensuring that the high-temperature gas is discharged along the preset emission channel, but also enhances the structural strength of the first housing 1 and the second housing 2, which helps to extend the service life of the battery explosion-proof valve protection structure 100 in this embodiment.

[0109] In practice, the shape of the clearance opening 81 can match the outer contour of the explosion-proof valve 201. This way, when the explosion-proof valve 201 is inserted into the corresponding clearance opening 81, the fit between the two is good, which improves the sealing performance between them.

[0110] In some implementations, the sealing plate 8 can be integrally formed with the first cover 1 and the second cover 2, resulting in good integrity and high structural strength. Of course, in other implementations, the sealing plate 8 can also be connected to the first cover 1 and the second cover 2 by welding, bolts, or other methods.

[0111] In some other implementations, the sealing plate 8 can be directly installed on the housing 202 of the battery 200. When the first cover 1 and the second cover 2 are installed on the housing 202, the sealing plate 8 covers the first cavity 3 and the second cavity 4 for easy assembly.

[0112] In practice, the sealing plate 8 is made of high-temperature resistant materials, such as aluminum, stainless steel, carbon fiber, etc.

Claims

1. A battery explosion-proof valve protection structure, characterized in that, Including a first casing and a second casing; The first cover is used to cover at least the explosion-proof valve of the battery and together with the battery define a first cavity; the second cover is at least covered on the side of the first cover away from the battery, and the second cover together with the first cover define a second cavity. The first cover has a first through hole to connect the first cavity and the second cavity. The second cover has a second through hole to connect with the outside. The first through hole and the second through hole are staggered and are both located on one side of the radial direction of the exhaust port of the explosion-proof valve.

2. The battery explosion-proof valve protection structure according to claim 1, characterized in that, The first through hole and the second through hole are located on the same side of the explosion-proof valve; Both the first through hole and the second through hole are located below the explosion-proof valve.

3. The battery explosion-proof valve protection structure according to claim 1, characterized in that, The first through hole and the second through hole are respectively located on both sides of the explosion-proof valve; The first through hole and the second through hole are respectively located on both sides of the explosion-proof valve along the radial direction of the exhaust port.

4. The battery explosion-proof valve protection structure according to claim 1, characterized in that, The second cover has an open side on the radial side of the exhaust port, and the open side is formed as the second through hole; And / or, the orthogonal projection of the first through hole onto the battery is offset from that of the explosion-proof valve.

5. The battery explosion-proof valve protection structure according to claim 1, characterized in that, The first cover includes a cover body and two support plates; The two support plates are arranged opposite each other and spaced apart. The cover is located between the two support plates and is connected to the side of the two support plates facing the second cover. The two support plates, the side of the cover away from the second cover, and the outer wall of the battery together define the first cavity. The first through hole is formed on the cover.

6. The battery explosion-proof valve protection structure according to claim 5, characterized in that, The cover includes a first cover section and a second cover section; The first cover segment and the second cover segment are respectively located on both sides of the center line of the exhaust port, and in the direction from the side of the cover body facing the battery to the side of the cover body away from the battery, the first cover segment and the second cover segment are inclined towards each other. The first through hole is opened on the first cover segment or the second cover segment, and the angle between the first cover segment or the second cover segment where the first through hole is located and the outer wall of the battery facing the first cavity is 20°-60°.

7. The battery explosion-proof valve protection structure according to claim 1, characterized in that, The explosion-proof valve is at least two, and the battery explosion-proof valve protection structure also includes at least one separator; The separator is disposed in the first cavity to divide the first cavity into at least two sub-cavities. Each sub-cavity is connected to the second cavity through the first through hole, and each sub-cavity corresponds to one explosion-proof valve.

8. The battery explosion-proof valve protection structure according to claim 7, characterized in that, The first through hole includes at least two sub-holes, which are spaced apart along the arrangement direction of the plurality of explosion-proof valves, and each sub-cavity is provided with at least one sub-hole.

9. The battery explosion-proof valve protection structure according to any one of claims 1 to 8, characterized in that, The battery explosion-proof valve protection structure also includes a sealing plate; The sealing plate is provided on the side of the first cover facing the battery and the side of the second cover facing the battery, and the sealing plate has a clearance opening at the position corresponding to the explosion-proof valve for the explosion-proof valve to extend into the first cavity. The sealing plate is connected to at least one of the first cover, the second cover, and the battery.

10. A battery, characterized in that, Includes the battery explosion-proof valve protection structure as described in any one of claims 1 to 9.

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