Battery pack safety valve assembly and battery pack

Abstract

The battery pack safety valve assembly comprises a valve assembly which is arranged on one side of the inner wall of the battery pack and points to the outer portion of the battery pack, the valve assembly comprises a valve body, the valve body is of a cylindrical structure, an annular limiting groove is formed in an inner valve cavity of the valve body, and when gas is generated in the battery pack and internal pressure is increased, the annular limiting groove is matched with the annular limiting groove. The air pressure of air pushes a pressure valve cover to move towards one end in an annular limiting groove through an annular supporting sliding block, the annular supporting sliding block slides in the annular limiting groove through a sealing rubber valve ring, an annular supporting block slides to one side of the annular limiting groove, meanwhile, the air flows into the inner space of a buffer air bag through an air hole, and the air bag is sealed. Therefore, the pressure value is gradually reduced when the gas flows into the buffer gas bag, so that the bearing force on the pressure valve cover is reduced, the phenomenon that the pressure valve cover is broken and exploded due to the overlarge pressure value can be reduced, and the explosion risk of the battery pack is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery pack safety valve assembly and a battery pack. Background Art

[0002] Battery packs swell during use, and there is a risk of explosion if the battery pack swells severely. Therefore, the safety design of the battery pack is essential. At present, the general safety setting of the battery pack is to set a safety valve in the packaging layer of the battery pack. When the internal pressure of the battery pack exceeds the predetermined threshold, the safety valve opens and the internal gas will be ejected from the safety valve. However, since the leakage of gas ejected from the battery pack will have a certain adverse effect on the external environment, how to avoid pollution to the environment while ensuring the safety of the battery pack is a problem.

[0003] To this end, a battery pack safety valve assembly and a battery pack with the announcement number "CN219329360U" are disclosed. The battery pack safety valve assembly includes a sealing gasket, a support sheet, an airbag and a packaging film arranged in sequence in the direction from the inside of the battery pack to the outside thereof; a plurality of microporous structures penetrating the support sheet are arranged on the support sheet; the air inlet of the airbag is sealed and connected to the support sheet and covers all the microporous structures, and the microporous structures are connected to the inside of the airbag; the packaging film is used to be attached to the outermost side of the packaging layer of the battery pack; the sealing gasket is located on the side of the support sheet away from the airbag and is connected to the inside of the battery pack; when the internal pressure in the battery pack exceeds the preset threshold, the sealing gasket opens to connect the inside of the battery pack with the microporous structure, and the airbag expands and breaks the packaging film. The battery pack safety valve assembly is applied to the battery pack, which not only reduces the risk of explosion of the battery pack, but also can collect the generated gas in the airbag to avoid air pollution, which is beneficial to environmental protection.

[0004] However, with regard to the above-mentioned battery pack safety valve assembly and battery pack, although gas is generated in the battery pack and the gas is collected in the airbag, which can reduce the expansion of the battery pack, reduce the risk of explosion of the battery pack, and improve the safety of battery pack use, and the generated gas can be collected in the airbag to avoid air pollution, which is beneficial to environmental protection, there are still the following obvious defects during use: the airbag provided in the above-mentioned can only collect the gas into the interior, because the air pressure value that the airbag can withstand has a certain tolerance value, and the airbag can only withstand the gas but cannot reduce the air pressure value of the gas, when the battery pack pressure exceeds the range of the airbag's tolerance value, the battery pack will rupture and explode, and the gas generated by the battery pack will still diffuse to the outside and affect the environment. Utility Model Content

[0005] The purpose of the utility model is to provide a battery pack safety valve assembly and a battery pack to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a battery pack safety valve assembly, including a valve assembly on one side of the inner wall of the battery pack pointing to the outside thereof, the valve assembly including a valve body, the valve body being a cylindrical structure, an annular limiting groove being provided in the internal valve cavity of the valve body, an annular supporting slider being slidable inside the annular limiting groove, a pressure valve cover of an arc-shaped structure being provided on the inner side of the annular supporting slider, a sealing rubber valve ring being provided on the outer side of the annular supporting slider in contact with the annular limiting groove, an elastic pressure expansion member being provided on one side of the annular supporting slider, and a pressure spring being sleeved on one end of the elastic pressure expansion member and fixedly connected to one side wall of the inner side of the annular limiting groove, an internal thread groove being provided on one side corresponding to the pressure valve cover and located on the inner side of one end of the valve body, a disc-shaped gas filter plate being mounted on the inner side of the internal thread groove, and a sealing valve cover being screwed in the internal thread groove and located on one end of the valve body, and a buffer gas bag installed inside the side plate of the battery pack being connected through the upper and lower ends of the valve body.

[0007] Preferably, an air intake valve block with a trapezoidal structure is provided inside one end of the valve body, and an air valve hole is provided in the middle of the air intake valve block, so that the gas inside the battery pack can enter the inside of the valve body to ensure the safe release of the battery pack pressure.

[0008] Preferably, a stabilizing annular ring is provided on the outside of the gas filter plate, and the gas filter plate is assembled inside the internal thread groove through the stabilizing annular ring, which can filter the gas generated inside the battery pack to ensure that it will not affect the external environment.

[0009] Preferably, a tightening cylinder block is provided on one side of the sealing valve cover, and the sealing valve cover is threadedly fixed to the inside of the internal thread groove through the tightening cylinder block and the gas filter plate is pressed and fixed. A diaphragm with micropores is provided on the surface of the sealing valve cover to facilitate the discharge of filtered gas.

[0010] Preferably, the upper and lower ends of the valve body are provided with air holes for discharging gas inside the battery pack, and one end of the air hole is connected to one end of the cache air bag, so that the gas generated inside the battery pack can enter the interior of the cache air bag to reduce the pressure value of the gas.

[0011] Preferably, the pressure valve cover slides in the annular limit groove through the annular support slider according to the change of the internal air pressure of the battery pack, and the surface of the pressure valve cover is evenly provided with pressure-relieving micropores, which can enable the pressure valve cover to move upward through the air pressure after the internal air pressure value of the battery pack reaches the value that the safety valve can withstand, allowing the gas to enter the cache air bag to reduce the air pressure expansion value.

[0012] A battery pack comprises the battery pack safety valve assembly.

[0013] Preferably, it also includes a battery pack shell, wherein an air pressure buffer chamber is provided inside the battery pack shell, the air pressure buffer chamber is filled with a buffer rubber plate, the inner side wall of the air pressure buffer chamber is provided with a battery insulating plate layer, and the inner side of the battery insulating plate layer is provided with a liquid cooling chamber.

[0014] Preferably, a liquid cooling connecting pipe is provided at the end of the liquid cooling chamber, and one end of the liquid cooling connecting pipe is sealed and penetrates to the outside of the upper end of the battery pack shell, so as to cool the inside of the battery pack and reduce the temperature of the battery group inside the battery pack.

[0015] Preferably, a through mounting hole for installing and fixing the valve assembly is provided on one side of the battery pack shell, and cavities for installing the cache air bag are provided inside the upper and lower ends of the through mounting hole, which can reduce the occurrence of bulging of the battery pack and damage to the shell.

[0016] The technical effects and advantages of the utility model are as follows: the battery pack safety valve assembly and the battery pack can generate gas in the battery pack through the combined use of the annular limit groove, the annular support slider, the pressure valve cover, the sealing rubber valve ring, the elastic pressure expansion member and the pressure spring inside the valve body. When the internal pressure increases, the gas pressure pushes the pressure valve cover to move to one end in the annular limit groove through the annular support slider, and the annular support slider slides in the annular limit groove using the sealing rubber valve ring, and the annular support block slides to one side of the annular limit groove, and at the same time, the gas flows into the internal space of the cache air bag through the air hole, so that the pressure value of the gas flowing into the cache air bag gradually decreases, so as to reduce the bearing capacity of the pressure valve cover, thereby reducing the phenomenon of the pressure valve cover rupture and explosion due to excessive air pressure, thereby reducing the risk of explosion of the battery pack and improving the safety of battery pack use.

[0017] By using the internal thread groove, the gas filter plate and the diaphragm with micropores on the sealing valve cover, when the gas inside the battery pack impacts the pressure valve cover, part of the gas can be discharged through the micropores on the pressure valve cover, and the discharged gas shell can adsorb and filter harmful substances in the gas through the set gas filter plate, so that the discharged gas will not affect the external environment, thereby reducing the impact of the gas on the pressure valve cover to cause rupture and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main structure of the valve assembly of the utility model;

[0020] Figure 3 This is a schematic diagram of the changing state of the elastic pressure expansion member of the utility model when the air pressure pushes the pressure valve cover to move in the valve body;

[0021] Figure 4 This is a schematic diagram of the main structure of the battery pack shell of the present utility model.

[0022] In the figure: 1. valve assembly; 2. annular limit groove; 3. annular support slider; 4. pressure valve cover; 5. sealing rubber valve ring; 6. elastic pressure telescopic member; 7. pressure spring; 8. internal thread groove; 9. gas filter plate; 10. sealing valve cover; 11. buffer air bag; 12. intake valve block; 13. air valve hole; 14. tightening cylinder block; 15. air hole; 16. battery pack shell; 17. air pressure buffer chamber; 18. buffer rubber plate; 19. battery insulation plate layer; 20. liquid cooling chamber; 21. valve body; 22. telescopic rod; 22. sleeve rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4 The utility model provides a technical solution: a battery pack safety valve assembly, including a valve assembly 1 on one side of the inner wall of the battery pack pointing to the outside thereof, an air intake valve block 12 with a trapezoidal structure is provided inside one end of the valve body 21, and an air valve hole 13 is provided in the middle of the air intake valve block 12 for supporting the valve body 21 and allowing the gas inside the battery pack to enter, the valve assembly 1 includes a valve body 21, the valve body 21 is a cylindrical structure, an annular limiting groove 2 is provided in the internal valve cavity of the valve body 21, allowing the annular supporting slider 3 to slide in a limited manner, an annular supporting slider 3 is slid inside the annular limiting groove 2, and a pressure valve cover 4 can be moved and exhausted inside the valve body 21 according to the size of the gas, and a pressure valve cover 4 with an arc-shaped structure is provided on the inner side of the annular supporting slider 3, which can withstand the pressure value of the gas generated inside the battery pack.

[0025] The pressure valve cover 4 slides in the annular limit groove 2 through the annular support slider 3 according to the change of the internal air pressure of the battery pack, and the surface of the pressure valve cover 4 is evenly provided with pressure-relieving micropores, which can discharge part of the gas through the pressure-relieving micropores to reduce the expansion pressure. The side of the annular support slider 3 that contacts the annular limit groove 2 is provided with a sealing rubber valve ring 5, which can ensure the sealing of the sliding between the annular support slider 3 and the annular limit groove 2. An elastic pressure telescopic member 6 is provided on one side of the annular support slider 3. The elastic pressure telescopic member 6 is a sleeve rod and a telescopic rod movably inserted into one end of the sleeve rod. The pressure spring 7 is sleeved on the other end of the telescopic rod 22. Figure 2 and Figure 3 As shown, when the air pressure in the battery pack housing 16 increases, the air pressure pushes the pressure valve cover 4 to move in the valve body 21 ( Figure 2 The telescopic rod 22 extends and moves relative to the sleeve rod 23 and the pressure spring 7 is stretched. When the air pressure in the valve body 21 decreases, the resilience of the pressure spring 7 pulls the sleeve rod 23 back to the initial state, so that the sleeve rod 23 drives the pressure valve cover 4 back to the initial position, which is conducive to the safe movement of the pressure valve cover 4 according to the size of the air pressure. One end of the elastic pressure telescopic member 6 is sleeved with the pressure spring 7 and is fixedly connected to the inner side wall of the annular limit groove 2 to enhance the elastic retraction sealing of the pressure valve cover 4. An internal thread groove 8 is provided on the inner side of one end of the valve body 21 corresponding to the pressure valve cover 4. A disc-shaped gas filter plate 9 is installed on the inner side of the internal thread groove 8 to filter out harmful substances from part of the gas and reduce pollution to the environment. In this embodiment, the telescopic rod 22 is a multi-section rod, which can be selected according to the specific use conditions, such as a 2-section (level) rod or a 3-section (level) rod.

[0026] A stabilizing annular ring is provided on the outside of the gas filter plate 9, and the gas filter plate 9 is assembled inside the internal thread groove 8 through the stabilizing annular ring, which makes it more convenient to replace the gas filter plate 9 in the later stage, and a sealing valve cover 10 is screwed in the internal thread groove 8 and located at one end of the valve body 21, which is used to seal the outer end of the valve body 21, and a tightening cylinder block 14 is provided on one side of the sealing valve cover 10, and the sealing valve cover 10 is threadedly fixed to the inside of the internal thread groove 8 through the tightening cylinder block 14 and presses and fixes the gas filter plate 9, and a diaphragm with micropores is provided on the surface of the sealing valve cover 10, which is beneficial to the discharge of filtered gas and reduces the pressure of the safety valve on the gas, and the upper and lower ends of the valve body 21 are through-connected with a cache air bag 11 installed inside the side plate of the battery pack, which is used to cache the gas and reduce the air pressure value, and the upper and lower ends of the valve body 21 are provided with air holes 15 for discharging the gas inside the battery pack, and one end of the air hole 15 is connected to one end of the cache air bag 11, so that most of the gas can enter the cache air bag 11 to relieve the pressure.

[0027] In addition, in order to achieve the above-mentioned purpose, the utility model also provides a battery pack, including the battery pack safety valve assembly.

[0028] Specifically, it also includes a battery pack shell 16, and an air pressure buffer chamber 17 is provided inside the battery pack shell 16 to prevent damage to the battery pack shell 16 caused by instantaneous battery bulging. The air pressure buffer chamber 17 is filled with a buffer rubber plate 18 to improve the safety of the battery pack shell 16. The inner wall of the air pressure buffer chamber 17 is provided with a battery insulating plate layer 19 to perform insulation isolation when a fault occurs inside the battery pack. A liquid cooling chamber 20 is provided on the inner side of the battery insulating plate layer 19, and a liquid cooling connecting pipe is provided at the end of the liquid cooling chamber 20 to allow cooling liquid to enter the liquid cooling chamber 20 to cool the high-temperature battery pack to avoid high temperature hazards. One end of the liquid cooling connecting pipe is sealed and penetrates to the outside of the upper end of the battery pack shell 16. A through mounting hole is provided on one side of the battery pack shell 16 for installing and fixing the valve assembly 1, and cavities for installing the cache air bag 11 are provided inside the upper and lower ends of the through mounting hole.

[0029] Specifically, when in use, gas is generated in the battery pack. When the internal pressure increases, the gas enters the valve body 21 through the air valve hole 13 provided in the air inlet valve block 12, and the gas entering the valve body 21 has a certain air pressure thrust, which causes the pressure valve cover 4 to slide to one side inside the annular limit groove 2 through the annular support slider 3, and the sealing rubber valve ring 5 seals and fits on the inner wall of the annular limit groove 2 and slides to the end, so that the valve body 21 is connected with the cache air bag 11 and opens, and then the gas flows into the cache air bag 11 through the air hole 15 on the valve body 21. The space inside the cache air bag 11 can be used to relieve the expansion value of the gas pressure inside to reduce the impact of the pressure valve cover 4 being subjected to the higher air pressure value, thereby avoiding rupture and explosion, thereby making the battery pack safer. At the same time, part of the gas is discharged through the pressure-relieving micropores on the pressure valve cover 4. In order to prevent the gas from polluting the external environment, the harmful gas that pollutes the environment in the gas is filtered out by the gas filter plate 9, so that the discharged gas will not affect the air and the environment.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. 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. A battery pack safety valve assembly, comprising a valve assembly (1) on one side of an inner wall of the battery pack pointing to the outside thereof, characterized in that: The valve assembly (1) comprises a valve body (21), the valve body (21) is a cylindrical structure, an annular limit groove (2) is provided in the internal valve cavity of the valve body (21), an annular support slider (3) is slidably disposed inside the annular limit groove (2), a pressure valve cover (4) with an arc-shaped structure is provided on the inner side of the annular support slider (3), a sealing rubber valve ring (5) is provided on the outer side of the annular support slider (3) which contacts the annular limit groove (2), an elastic pressure expansion member (6) is provided on one side of the annular support slider (3), and the elastic pressure expansion member (6) is provided on the inner side of the annular support slider (3). One end of the flexible pressure expansion member (6) is sleeved with a pressure spring (7) and is fixedly connected to an inner side wall of the annular limit groove (2); an inner thread groove (8) is provided on the inner side of one end of the valve body (21) and corresponding to the side of the pressure valve cover (4); a disc-shaped gas filter plate (9) is installed on the inner side of the inner thread groove (8); and a sealing valve cover (10) is screwed in the inner thread groove (8) and located at one end of the valve body (21); the upper and lower ends of the valve body (21) are through-connected with a buffer gas bag (11) installed inside the side plate of the battery pack.

2. A battery pack safety valve assembly according to claim 1, characterized in that: An air intake valve block (12) with a trapezoidal structure is provided inside one end of the valve body (21), and an air valve hole (13) is provided in the middle of the air intake valve block (12).

3. A battery pack safety valve assembly according to claim 1, characterized in that: A stabilizing annular ring is provided on the outside of the gas filter plate (9), and the gas filter plate (9) is assembled inside the internal thread groove (8) via the stabilizing annular ring.

4. A battery pack safety valve assembly according to claim 1, characterized in that: A tightening cylinder block (14) is provided on one side of the sealing valve cover (10), and the sealing valve cover (10) is threadedly fixed inside the internal thread groove (8) through the tightening cylinder block (14) and presses and fixes the gas filter plate (9), and a diaphragm with micropores is provided on the surface of the sealing valve cover (10).

5. A battery pack safety valve assembly according to claim 1, characterized in that: The upper and lower ends of the valve body (21) are both provided with air holes (15) for discharging gas from the battery pack, and one end of the air hole (15) is connected to one end of the buffer air bag (11).

6. A battery pack safety valve assembly according to claim 1, characterized in that: The pressure valve cover (4) slides in the annular limiting groove (2) through the annular supporting slider (3) according to the change of the internal air pressure of the battery pack, and the surface of the pressure valve cover (4) is evenly provided with pressure-relieving micropores.

7. A battery pack, characterized in that: Comprising a battery pack safety valve assembly as described in any one of claims 1-6.

8. A battery pack according to claim 7, characterized in that: The invention also comprises a battery pack shell (16), wherein an air pressure buffer chamber (17) is provided inside the battery pack shell (16), the air pressure buffer chamber (17) is filled with a buffer rubber plate (18), the inner side wall of the air pressure buffer chamber (17) is provided with a battery insulating plate layer (19), and the inner side of the battery insulating plate layer (19) is provided with a liquid cooling chamber (20).

9. A battery pack according to claim 8, characterized in that: A liquid cooling connection pipe is provided at the end of the liquid cooling cavity (20), and one end of the liquid cooling connection pipe is sealed and penetrates to the outside of the upper end of the battery pack shell (16).

10. A battery pack according to claim 8, characterized in that: A through-mounting hole for mounting and fixing the valve assembly (1) is provided on one side of the battery pack housing (16), and cavities for mounting the buffer air bag (11) are provided inside the upper and lower ends of the through-mounting hole.

Images