Explosion-proof valve structure, battery pack, electric equipment and energy storage equipment

Abstract

The utility model provides an anti-explosion valve structure, a battery pack, electric equipment and an energy storage device. The anti-explosion valve structure comprises a mounting seat with an exhaust channel, two plate bodies which are positioned in the exhaust channel and are oppositely arranged, and a holding part, at least one of the two plate bodies is rotationally arranged on the mounting seat, the holding part comprises an elastic piece and a limiting block which are arranged on the two sides of the plate body respectively, and the plate body abuts against the limiting block under the elastic force of the elastic piece and is kept in a closed state of blocking the exhaust channel; at least one plate body is provided with a sealing part, in a closed state, the sealing part can seal a gap between the two plate bodies, under the pushing of airflow in the exhaust channel, the sealing part generates elastic deformation and relieves sealing between the two plate bodies, and when the airflow pressure exceeds the elastic force of the elastic piece, the plate bodies rotate relative to the mounting base to conduct the exhaust channel. The explosion-proof valve structure disclosed by the utility model can cope with the conditions of slow gas production and emergency instantaneous large-volume gas production at the same time, and can be repeatedly utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to an explosion-proof valve structure. The utility model also relates to a battery pack provided with the explosion-proof valve structure. The utility model also relates to an electrical device and an energy storage device provided with the battery pack. Background Art

[0002] At present, the mainstream explosion-proof valves are divided into two types according to whether they can be reused. One is a reusable piston spring type explosion-proof valve, and the other is a disposable ejector pin type explosion-proof valve.

[0003] The piston-type explosion-proof valve can be used repeatedly, and the maintenance cost is low. However, because it relies on spring exhaust, the explosion is unstable, and the exhaust gap is prone to dust and sand accumulation or mud covering the surface, which affects its performance. The exhaust capacity before and after the explosion is insufficient, and the pressure relief time is long. It is generally only used on low-speed vehicles or electric bicycles, and cannot meet the needs of power battery loading vehicles. In the ejector-type explosion-proof valve, when in the explosion-proof working state, the membrane material is punctured after hitting the ejector, the gas is quickly discharged, and the pressure is relieved quickly. However, once the battery pack is started, the inside is directly connected to the outside world, and the battery is declared scrapped.

[0004] In automotive power battery applications, in order to fully protect the safety of life and property of personnel, a disposable explosion-proof valve of ejector type is generally used. However, when the disposable explosion-proof valve is opened, the battery pack is scrapped at the same time. This is not friendly to systems with continuous and large gas production (such as ternary lithium batteries), and its performance cannot be fully utilized, resulting in serious waste. Utility Model Content

[0005] In view of this, the utility model aims to propose an explosion-proof valve structure that can simultaneously cope with the situations of slow gas production and emergency instantaneous large-scale gas production, and can be reused.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] An explosion-proof valve structure comprises a mounting seat having an exhaust passage, two plates arranged opposite to each other in the exhaust passage, and a retaining portion;

[0008] At least one of the two plates is rotatably mounted on the mounting seat, the retaining portion comprises an elastic member connected between the rotatable plate and the mounting seat, and a limit block disposed on the mounting seat, the limit block and the elastic member are respectively disposed on both sides of the corresponding plate, the plate abuts against the limit block under the elastic force of the elastic member and remains in a closed state of blocking the exhaust passage;

[0009] At least one of the plates is provided with a sealing portion, and in the closed state, the sealing portion can seal the gap between the two plates, and under the push of the airflow in the exhaust channel, the sealing portion can produce elastic deformation and release the seal between the two plates, and when the airflow pressure exceeds the elastic force of the elastic member, the plate connected to the elastic member can rotate relative to the mounting seat to open the exhaust channel.

[0010] Furthermore, the sealing portion includes an extended sheet connected to the end of the plate; in the closed state, the extended sheet can be attached to another plate; or, the extended sheets at the ends of the two plates can be partially overlapped with each other.

[0011] Furthermore, the extension sheet is made of epichlorohydrin rubber.

[0012] Furthermore, in the direction from one of the plates to the other of the plates, the thickness of the extended sheet is gradually reduced.

[0013] Furthermore, the cross section of the extended sheet is triangular, and the base length a and height h of the triangle satisfy: 1.5≤h / a≤2.5.

[0014] Furthermore, a ratio i1 of the thickness of the plate body to the thickness of the mounting seat satisfies: 1 / 5≤i1≤1 / 2.

[0015] Furthermore, the flow cross-section of the exhaust channel is rectangular, and in the direction from one plate body to the other plate body, the ratio i2 of the size of each plate body to the size of the exhaust channel satisfies: 1 / 5≤i2≤3 / 5.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The explosion-proof valve structure described in the utility model is characterized in that, through the limit blocks and elastic members arranged on both sides of the plate body, the plate body abuts against the limit blocks under the elastic force of the elastic member and is maintained in a closed state blocking the exhaust passage. At the same time, the sealing part arranged on the plate body can seal the gap between the two plate bodies. Under the push of the airflow, the sealing part can first be elastically deformed to release the seal between the two plate bodies to release the gas. When a large airflow is generated instantaneously, that is, when the airflow pressure exceeds the elastic force of the elastic member, the plate body rotates relative to the mounting seat to open the exhaust passage to release more gas, thereby achieving timely pressure relief. In this way, the explosion-proof valve of the utility model can cope with both slow gas production and emergency instantaneous large-scale gas production at the same time, and can be reused and has a good use effect.

[0018] In addition, the sealing part adopts an extended sheet connected to the end of the plate body, which has a simple structure, is easy to process and prepare, and can also help to ensure the sealing performance between the two plates. The extended sheet is made of chloroether rubber, which can take advantage of the good self-adhesiveness of the material to ensure good sealing performance between the two plates.

[0019] Secondly, the thickness of the extended sheet is gradually reduced, which is conducive to the elastic deformation of the extended sheet and the adhesion between the extended sheet and the plate or between two extended sheets. The cross-section of the extended sheet is designed to be triangular, and the length and height of the triangle base are limited, so that it can adapt to different stress change requirements.

[0020] In addition, the thickness of the plate body is limited, which can ensure a good sealing effect on the exhaust channel while preventing the plate body from being too thick and affecting the opening of the exhaust channel. The ratio of the size of each plate body in the direction from one plate body to another plate body to the size of the exhaust channel is limited, which is conducive to leaving a certain space for the sealing part and can further ensure the use effect of the explosion-proof valve.

[0021] Another object of the present invention is to provide a battery pack, wherein the shell of the battery pack is provided with the above-mentioned explosion-proof valve structure.

[0022] In addition, another object of the present invention is to provide an electrical device, wherein the electrical device is provided with the battery pack as described above. At the same time, another object of the present invention is to provide an energy storage device, wherein the energy storage device is provided with the battery pack as described above.

[0023] The battery pack, electrical equipment and energy storage device of the present invention have the same beneficial effects as the explosion-proof valve structure described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 This is a front view of the explosion-proof valve structure described in an embodiment of the utility model;

[0026] Figure 2 It is a left view of the explosion-proof valve structure described in the embodiment of the utility model;

[0027] Figure 3 It is a structural diagram of different states of the explosion-proof valve structure in use according to the embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the extended sheet body according to an embodiment of the utility model;

[0029] Description of reference numerals:

[0030] 1. Mounting seat; 11. Limiting block; 21. First plate body; 22. Second plate body; 31. First extension sheet body; 32. Second extension sheet body; 4. Elastic member; 5. Rotating shaft. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Embodiment 1

[0036] The present embodiment relates to an explosion-proof valve structure, which can cope with both slow gas production and emergency instantaneous large-scale gas production, and can be reused.

[0037] In terms of overall structure, the explosion-proof valve structure of this embodiment is as follows: Figure 1 and Figure 2 As shown, the explosion-proof valve structure includes a mounting seat 1 having an exhaust passage, two plates arranged opposite to each other in the exhaust passage, and a retaining portion.

[0038] Among them, at least one of the two plates is rotatably arranged on the mounting seat 1, and the retaining part includes an elastic member 4 connected between the rotatable plate body and the mounting seat 1, and a limit block 11 arranged on the mounting seat 1, and the limit block 11 and the elastic member 4 are respectively arranged on both sides of the corresponding plate body. The plate body abuts against the limit block 11 under the elastic force of the elastic member 4 and remains in a closed state of blocking the exhaust channel.

[0039] And at least one of the plates is provided with a sealing portion, which can seal the gap between the two plates in a closed state, and under the push of the airflow in the exhaust channel, the sealing portion can produce elastic deformation and release the seal between the two plates, and when the airflow pressure exceeds the elastic force of the elastic member 4, the plate connected to the elastic member 4 can rotate relative to the mounting seat 1 to open the exhaust channel.

[0040] At this time, the limit blocks 11 and elastic member 4 arranged on both sides of the plate body can make the plate body abut against the limit blocks 11 under the elastic force of the elastic member 4, and maintain the closed state of blocking the exhaust channel. At the same time, the sealing part arranged on the plate body can seal the gap between the two plate bodies. Under the push of the airflow, the sealing part can first be elastically deformed to release the seal between the two plate bodies to release the gas, and can cope with the slow gas production situation. When a large airflow is generated instantaneously, that is, when the airflow pressure exceeds the elastic force of the elastic member 4, the plate body rotates relative to the mounting seat 1 to open the exhaust channel to release more gas, realize timely pressure relief, and can cope with the emergency instantaneous large-scale gas production situation. At the same time, after the pressure relief, the plate body can be reset to a closed state under the action of the elastic member 4, and the explosion-proof valve can be reused.

[0041] It is worth noting that, of the two plates, one of the plates can be rotatably mounted on the mounting seat 1, or both of the plates can be rotatably mounted on the mounting seat 1. In addition, it is also worth noting that the sealing portion can be only disposed on one of the plates, or can be disposed on both of the plates. As a preferred embodiment, in this embodiment, both plates are rotatably mounted on the mounting seat 1, and both plates are provided with sealing portions, which can further improve the use effect.

[0042] As a preferred embodiment, the sealing part of this embodiment includes an extended sheet connected to the end of the plate body. In addition, the extended sheet is preferably made of chloroprene rubber, so that the rigidity and toughness of the material, the good acid, alkali and organic solvent resistance, and the good self-adhesiveness can be utilized to ensure good sealing performance when the plate body is in a closed state.

[0043] To facilitate a better understanding of the present solution, the two plates in the present embodiment are respectively defined as a first plate 21 and a second plate 22, and the two sealing parts are respectively defined as a first sealing part and a second sealing part. The first sealing part is also a first extended sheet 31 connected to the end of the first plate 21, and the second sealing part is also a second extended sheet 32 ​​connected to the end of the second plate 22.

[0044] When only an extended sheet is provided at the end of one plate, the extended sheet can be attached to the other plate in the closed state. When extended sheets are provided on both plates, that is, the first extended sheet 31 is provided at the end of the first plate 21 and the second extended sheet 32 ​​is provided at the end of the second plate 22, when the two plates are in the closed state, the extended sheets at the ends of the two plates can be partially overlapped with each other, that is, the first extended sheet 31 and the second extended sheet 32 ​​are partially overlapped, so that the sealing performance between the two plates can be ensured.

[0045] Combination Figures 2 to 4 As shown, in this embodiment, as a preference, the thickness of the extension sheet is gradually reduced in the direction from one plate to the other plate. Such a design can facilitate the elastic deformation of the free end of the extension sheet and improve the adhesion effect between the extension sheet and the opposite plate or between two extension sheets.

[0046] As a further preferred embodiment, in this embodiment, the cross section of the extended sheet is triangular, and the base length a and height h of the triangle satisfy: 1.5≤h / a≤2.5. By limiting the cross-sectional shape of the extended sheet and limiting the base length a and height h of the triangle, the extended sheet can adapt to different stress change requirements. In specific implementation, the cross section of the extended sheet is an isosceles triangle, which is conducive to the processing and preparation of the extended sheet, and the ratio of the base length a and the height h can be set to 1.5, 1.8, 2.0, 2.2 or 2.5, etc.

[0047] In addition, in this embodiment, the ratio i1 of the thickness of each plate body to the thickness of the mounting seat 1 satisfies: 1 / 5≤i1≤1 / 2. By limiting the thickness of the plate body, it can ensure a better blocking effect on the exhaust channel while also preventing the plate body from being too thick and affecting the opening of the exhaust channel. In specific implementation, the ratio i1 can be set to 1 / 5, 1 / 4, 1 / 3 or 1 / 2, etc., and is preferably set to 1 / 3. At this time, it can further ensure a better blocking effect on the exhaust channel, and it can also further prevent the plate body from being too thick and affecting the opening of the exhaust channel.

[0048] Moreover, in this embodiment, the flow cross-section of the exhaust channel is rectangular, and in the direction from one plate body to the other plate body, the ratio i2 of the size of each plate body to the size of the exhaust channel satisfies: 1 / 5≤i2≤3 / 5. Such a setting is conducive to leaving a certain space for the sealing part, and can further ensure the use effect of the explosion-proof valve. In specific implementation, the ratio i2 can be set to 1 / 5, 2 / 5 or 3 / 5, etc., and is preferably set to 2 / 5. At this time, it can further help to leave a certain space for the sealing part, and further ensure the use effect of the explosion-proof valve.

[0049] In addition, in this embodiment, a rotation shaft hole is provided at a position of the mounting seat 1 near the exhaust passage, and a rotation shaft 5 is provided at one end of each plate body, and the rotation shaft 5 is rotatably arranged in the rotation shaft hole, so that the rotation arrangement of each plate body can be realized. Of course, it can be understood that, for example, a hinge can also be provided between each plate body and the mounting seat 1, and the two ends of the hinge are respectively fixedly connected to the corresponding plate body and the mounting seat 1, so that the rotation of each plate body relative to the mounting seat 1 can also be realized.

[0050] In this embodiment, the elastic member 4 is preferably a spring made of high-strength steel, one end of which is connected to the mounting seat 1, and the other end is connected to the corresponding plate body. At this time, in a natural state, the plate body abuts against the limit block 11 under the elastic force of the spring, so that the plate body remains in a closed state of blocking the exhaust passage. In addition, in this embodiment, the plate body and the extended blade are bonded and connected to form, or the plate body and the extended blade are integrally formed. When integrally formed, a layer of material that is the same as the material of the extended blade can be coated on the outer layer of the plate body, which not only ensures the connection reliability between the plate body and the extended blade, but also prevents the electrolyte from corroding the plate body.

[0051] The explosion-proof valve structure of this embodiment is described by taking the application in a battery pack as an example. Figure 3 As shown, in the natural state, the two extended blades utilize the self-adhesiveness of the material itself and the action of the spring to keep the plate body in a closed state of blocking the exhaust passage ( Figure 3 When the battery cells in the battery pack generate gas during use, the pressure exerted by the gas inside the battery pack on the extension blades becomes greater and greater. Due to the elastic force of the spring, the plate can bear part of the gas pressure. When a certain threshold is reached, the edge of the extension blade is deformed under the action of the gas pressure and opens to the outside of the battery pack ( Figure 3 b state), so that the excess gas in the battery pack is discharged. After the pressure is released, due to the material properties, the extended blades can return to their original state, even if the battery pack remains in a closed state.

[0052] In an emergency, when a large amount of gas is generated in the battery pack, causing the gas pressure in the battery pack to increase sharply, that is, when the elastic force of the spring is exceeded, the plate body rotates around the rotation axis 5 relative to the mounting seat 1 toward the outside of the battery pack, and the conductive area of ​​the exhaust channel becomes larger ( Figure 3 c state), thereby achieving the pressure relief effect. At this time, the spring is compressed and stores energy. As the pressure is released, when the pressure in the battery pack is less than the elastic force of the spring, the plate returns to its original state under the energy release of the spring. If the battery cells in the battery pack can continue to operate, the explosion-proof valve can continue to be used. Moreover, in the working state, the pressure difference between the inside and outside of the battery pack and the size of the opening are in a stage of dynamic balance, which almost does not lead to the introduction of external air and can also avoid the occurrence of side reactions.

[0053] The explosion-proof valve structure of this embodiment can not only handle both the long-term slow gas production and short-term large-scale gas production of the battery cell, but is also reusable and expands the application scenarios, which is conducive to promotion and application.

[0054] Embodiment 2

[0055] The present embodiment relates to a battery pack, the shell of which is provided with the explosion-proof valve structure described in the first embodiment.

[0056] It should be noted that in the structure of the battery pack of this embodiment, the mounting seat 1 in the explosion-proof valve structure can be used as a part of the shell of the battery pack, or the mounting seat 1 is sealed and connected to the shell of the battery pack, which is feasible.

[0057] The battery pack of this embodiment adopts the explosion-proof valve structure of the first embodiment. When the gas pressure in the battery pack is slightly high, exhaust can be performed through the elastic deformation of the sealing part. When a large amount of gas is generated instantaneously in the battery pack, the gas pressure overcomes the elastic force of the elastic member 4 and drives the plate body to rotate to open the exhaust channel for timely pressure relief. After the pressure is relieved, the plate body is restored to a closed state through the action of the elastic member 4. Therefore, it can not only cope with slow gas production, but also cope with emergency instantaneous large-scale gas production. It can be reused and is beneficial to improving the performance of the battery pack.

[0058] In addition, this embodiment also relates to an electric device, in which the above-mentioned battery pack is provided. The electric device is, for example, a new energy vehicle. At the same time, this embodiment also relates to an energy storage device, in which the above-mentioned battery pack is also provided.

[0059] The electrical equipment and energy storage equipment of this embodiment have the same technical effects as the above-mentioned battery pack and explosion-proof valve structure of the first embodiment, and will not be described in detail here.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof valve structure, characterized in that: The invention comprises a mounting seat having an exhaust passage, two plates arranged opposite to each other and located in the exhaust passage, and a retaining portion; At least one of the two plates is rotatably mounted on the mounting seat, the retaining portion comprises an elastic member connected between the rotatable plate and the mounting seat, and a limit block disposed on the mounting seat, the limit block and the elastic member are respectively disposed on both sides of the corresponding plate, the plate abuts against the limit block under the elastic force of the elastic member and remains in a closed state of blocking the exhaust passage; At least one of the plates is provided with a sealing portion, and in the closed state, the sealing portion can seal the gap between the two plates, and under the push of the airflow in the exhaust channel, the sealing portion can produce elastic deformation and release the seal between the two plates, and when the airflow pressure exceeds the elastic force of the elastic member, the plate connected to the elastic member can rotate relative to the mounting seat to open the exhaust channel.

2. The explosion-proof valve structure according to claim 1, characterized in that: The sealing portion includes an extended sheet body connected to the end of the plate body; In the closed state, the extended sheet can be attached to another plate; or, the extended sheets at the ends of the two plates can be partially overlapped with each other.

3. The explosion-proof valve structure according to claim 2, characterized in that: The extended sheet body is made of epichlorohydrin rubber.

4. The explosion-proof valve structure according to claim 2, characterized in that: In the direction from one plate body to the other plate body, the thickness of the extended sheet body is gradually reduced.

5. The explosion-proof valve structure according to claim 4, characterized in that: The cross section of the extended sheet is triangular, and the base length a and height h of the triangle satisfy: 1.5≤h / a≤2.

5.

6. The explosion-proof valve structure according to claim 1, characterized in that: A ratio i1 of the thickness of the plate body to the thickness of the mounting seat satisfies: 1 / 5≤i1≤1 / 2.

7. The explosion-proof valve structure according to any one of claims 1 to 6, characterized in that: The flow cross-section of the exhaust channel is rectangular, and in the direction from one plate to the other plate, the ratio i2 of the size of each plate to the size of the exhaust channel satisfies: 1 / 5≤i2≤3 / 5.

8. A battery pack, characterized in that: The battery pack shell is provided with an explosion-proof valve structure according to any one of claims 1 to 7.

9. An electrical equipment, characterized in that: The electrical equipment is provided with the battery pack as claimed in claim 8.

10. An energy storage device, characterized in that: The energy storage device is provided with the battery pack described in claim 8.

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