Pressure relief assembly of power battery system

Abstract

The utility model discloses a power battery system pressure relief assembly which is used for a power battery system and comprises a flow guide pipe and an anti-explosion valve, the flow guide pipe is provided with a flow collecting section and a flow converging section, the flow collecting section is provided with a first port and a second port, the first port is communicated with a battery module of the power battery system, and the second port is communicated with a second port. The second port is communicated with the confluence section; one end of the explosion-proof valve is communicated with the confluence section, and the other end of the explosion-proof valve is communicated to the outside of the power battery system, in the above structure, when thermal runaway occurs in the battery module, thermal runaway substances flowing out of the battery module pass through the confluence section and the confluence section in sequence to reach the explosion-proof valve and then are discharged out of the power battery system, and the thermal runaway substances are discharged out of the power battery system. And the flow guide pipe is independent of the battery module for assembling the battery core, so that the influence of heat spreading is greatly relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a pressure relief component of a power battery system. Background Art

[0002] The pressure relief channel of the current power battery system is composed of the cavity of the aluminum profile box and the bottom guard plate. After the battery cell has thermal runaway, the thermal runaway substances pass through the pressure relief cavity and finally are discharged to the external environment through the explosion-proof valve installed on the aluminum profile box. When there are many battery cells, the pressure relief valves of all battery cells are generally set in the same direction, and then the pressure relief cavity is set in this direction to provide a channel for discharging thermal runaway substances for the battery cells that may have thermal runaway.

[0003] However, when more battery cells are arranged, the length of the corresponding pressure relief chamber will become longer. When the thermal runaway material is discharged in the conventional pressure relief chamber, it will cause a certain thermal impact on the battery cells passing through, and the heat spread problem cannot be well controlled. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art described above, the utility model provides a power battery system pressure relief assembly, which can solve the problem that heat propagation cannot be well controlled by relying solely on the pressure relief chamber in the power battery system.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] A power battery system pressure relief component, used in a power battery system, comprising:

[0007] A flow guide pipe, the flow guide pipe having a current collecting section and a current merging section, the current collecting section having a first port and a second port, the first port being connected to a battery module of the power battery system, and the second port being connected to the current merging section;

[0008] an explosion-proof valve, one end of which is connected to the confluence section, and the other end of which is connected to the outside of the power battery system;

[0009] There is a gap between the current collecting section and the current merging section and the battery cells in the power battery system.

[0010] By adopting the above scheme, the power storage part of the power battery system is designed and assembled in the form of a battery module, which can control the length of the pressure relief chamber in the battery module, and alleviate the heat spread problem to a certain extent. More importantly, when thermal runaway occurs in the battery module, the thermal runaway substances flowing out of the battery module are discharged from the power battery system after passing through the collecting section, the converging section and the explosion-proof valve in sequence. Since the guide tube is independently arranged from the battery module on which the battery cells are assembled, a gap is left between the guide tube and the battery cells in the power battery system, so the influence of heat spread is greatly alleviated.

[0011] Furthermore, a battery cell and a pressure relief chamber are provided in the battery module, the large surface of the battery cell is arranged horizontally, the battery cell has a pressure relief valve, the pressure relief valve is connected to the pressure relief chamber, and the first port is connected to the pressure relief chamber.

[0012] By adopting the above scheme, especially when the large surface of the battery cell is arranged horizontally, that is, when the battery cell is placed flat, based on this structure, the conventional pressure relief chamber structure cannot achieve pressure relief, and the pressure relief chamber is combined with the guide tube. When thermal runaway occurs in the battery cell, the high-temperature and high-pressure substances are directly discharged into the collecting section through the shorter pressure relief chamber, and then discharged from the power battery system after passing through the confluence section and the explosion-proof valve, which greatly reduces the risk of heat spread in the power battery system.

[0013] Furthermore, the power battery system is provided with N battery modules, and the current collecting sections are provided with N strips, wherein each of the first ports is connected to each of the battery modules in a one-to-one correspondence, and the second port is connected to the current collecting section.

[0014] By adopting the above scheme, when the power battery system adopts the setting mode of N battery modules, N current collecting sections are correspondingly set, wherein the first port of each current collecting section is installed corresponding to one of the battery modules, and is used to prepare to collect thermal runaway materials that may be generated in each battery module. The second ports of the N current collecting sections can be selected according to the demand. It can be selected that all the second ports are directly connected to the bus section separately, or the second port of at least one of the N current collecting sections is connected to the bus section, and the second ports of other current collecting sections that are not directly connected to the bus section are connected to adjacent current collecting sections, so as to achieve indirect connection with the bus section.

[0015] Furthermore, the power battery system is provided with N battery modules, and the current collecting sections are provided with N strips, wherein each of the first ports is connected to each of the battery modules in a one-to-one correspondence, an opening is provided between the first port and the second port of the current collecting section, and in the direction toward the bus section, the second port of the current collecting section close to the bus section is connected to the bus section, and the remaining second ports are connected to the openings on adjacent the current collecting sections in sequence.

[0016] By adopting the above solution, an opening is provided between the first port and the second port of the current collecting section to realize the sequential connection of the current collecting sections, facilitate the design of the flow guide pipe, and reduce the volume occupied by the pressure relief assembly in the power battery system.

[0017] Furthermore, the housing of the power battery system is provided with an assembly hole, and the explosion-proof valve is installed at the assembly hole.

[0018] By adopting the above solution, the assembly hole facilitates the installation of the explosion-proof valve, and the explosion-proof valve facilitates the connection between the inside and outside of the power battery system.

[0019] Furthermore, a sealing structure is provided at the connection between the explosion-proof valve and the assembly hole.

[0020] By adopting the above solution, the sealing structure can ensure the sealing between the explosion-proof valve and the assembly hole, and prevent thermal runaway substances from escaping from the joint between the explosion-proof valve and the assembly hole.

[0021] Furthermore, a structural cover plate is provided between the explosion-proof valve and the confluence section, the structural cover plate is connected to the explosion-proof valve, a confluence cavity is formed between the structural cover plate and the explosion-proof valve, and the confluence section is connected to the confluence cavity through the structural cover plate.

[0022] By adopting the above solution, the structural cover plate can provide a more convenient installation basis for the connection between the confluence section and the explosion-proof valve.

[0023] Furthermore, the structural cover plate is provided with a pressure relief pipe, the pressure relief pipe is communicated with the confluence section, and the pressure relief pipe is communicated with the confluence cavity.

[0024] By adopting the above solution, the structural cover plate is provided with a pressure relief pipe to facilitate the connection between the confluence section and the structural cover plate.

[0025] Furthermore, the explosion-proof valve is provided with an extension tube, the housing of the power battery system is provided with an assembly hole, the extension tube is arranged through the assembly hole, and the structural cover plate is threadedly connected to the extension tube.

[0026] By adopting the above scheme, an extension tube is provided on the explosion-proof valve, and the extension tube is passed through the assembly hole and threadedly connected to the structural cover plate, the confluence cavity formed by the explosion-proof valve and the structural cover plate can be made more airtight, and the assembly of the explosion-proof valve and the structural cover plate is also more convenient.

[0027] Furthermore, the outer edge of the structural cover plate extends to form a flange, and the structural cover plate is fixedly connected to the outer shell via the flange.

[0028] By adopting the above solution, the structural cover plate is fixed to the outer shell through the flange, which greatly improves the air tightness of the connection between the structural cover plate and the outer shell.

[0029] Furthermore, a sealing strip is provided between the flange and the housing, the sealing strip is arranged along the flange on the covering surface of the housing, and a limiting protrusion is provided on a side of the flange facing the sealing strip.

[0030] By adopting the above solution and providing a corresponding sealing strip on the flange, the air tightness of the connection between the structural cover plate and the shell can be further improved.

[0031] Furthermore, the flange is mounted on the housing by bolts, the flange is provided with screw holes for the bolts to pass through, the limiting protrusion is arranged along the aperture edge of the screw hole, the sealing strip is provided with avoidance holes at corresponding positions of the screw holes, and the limiting protrusion is arranged through the avoidance holes.

[0032] By adopting the above scheme, a limiting protrusion is provided at the screw hole of the flange, and a corresponding avoidance hole for avoiding the limiting protrusion is provided on the sealing strip. The limiting protrusion passes through the avoidance hole and abuts against the outer shell, which can control the compression amount of the sealing strip and prevent the problem of excessive compression of the sealing strip, thereby improving the sealing and stability of the sealing strip.

[0033] In summary, the power battery system pressure relief assembly provided by the utility model has the following technical effects:

[0034] 1. When thermal runaway occurs in the battery module, the thermal runaway substances flowing out of the battery module are discharged from the power battery system through the collector section, the confluence section and the explosion-proof valve. Since the guide tube is independent of the battery module for assembling the battery cells, the influence of heat spread is greatly alleviated;

[0035] 2. When the large surface of the battery cell is set horizontally, that is, when the battery cell is placed flat, the conventional pressure relief chamber structure cannot achieve pressure relief. The pressure relief chamber is combined with the guide tube. When the battery cell has thermal runaway, the high-temperature and high-pressure substances are directly discharged into the collecting section through the shorter pressure relief chamber, and then discharged from the power battery system after passing through the confluence section and the explosion-proof valve, which greatly reduces the risk of heat spread in the power battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0037] Figure 2 This is a schematic diagram of the structure of the explosion-proof valve and the structural cover plate of the utility model in a threaded connection state;

[0038] Figure 3 For this utility model Figure 2 AA cross-sectional structural diagram;

[0039] Figure 4 This is a first-view structural schematic diagram of the explosion-proof valve and the structural cover plate of the utility model in a threaded connection state;

[0040] Figure 5 It is a schematic diagram of the third perspective structure of the explosion-proof valve and the structural cover plate of the utility model in a threaded connection state;

[0041] Figure 6 This is a schematic diagram of the structure of the utility model in which the structural cover plate adopts a flange plate and a shell in connection state;

[0042] Figure 7 For this utility model Figure 6 Schematic diagram of the BB cross-section structure.

[0043] Figure 8 This is a first-view structural schematic diagram of the structural cover of the utility model in a state where the flange is connected to the shell.

[0044] Fig. 9 This is a second perspective structural schematic diagram of the structural cover of the utility model in a state where the flange is connected to the shell.

[0045] Among them, the meanings of the accompanying drawings are as follows: 11. Collecting section; 12. Converging section; 2. Explosion-proof valve; 21. Extension pipe; 3. Structural cover; 31. Pressure relief pipe; 32. Flange; 33. Screw hole; 34. Limiting protrusion; 4. Battery module; 41. Battery cell; 42. Pressure relief valve; 43. Pressure relief chamber; 5. Shell; 51. Assembly hole; 6. Sealing structure; 7. Converging chamber; 8. Sealing strip; 81. Avoidance hole; 9. U-shaped tube. DETAILED DESCRIPTION

[0046] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0048] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0050] See also Figure 1-Figure 5 As shown, the utility model discloses a power battery system pressure relief component, which is used for the power battery system, including a guide pipe and an explosion-proof valve 2, the guide pipe has a collecting section 11 and a bus section 12, the collecting section 11 has a first port and a second port, the first port is connected to the battery module 4 of the power battery system, and the second port is connected to the bus section 12, one end of the explosion-proof valve 2 is connected to the bus section 12, and the other end is connected to the outside of the power battery system, wherein a gap is left between the collecting section 11 and the bus section 12 and the battery cells in the power battery system.

[0051] Specifically, the flow guide tube has a current collecting section 11 and a confluence section 12, wherein the current collecting section 11 is used to collect thermal runaway substances that may be generated in the battery module 4 connected thereto, and the confluence section 12 is used to merge the thermal runaway substances collected by the current collecting section 11 and discharge the thermal runaway substances from the explosion-proof valve 2. The two ends of the current collecting section 11 are respectively a first port and a second port, the first port is connected to the battery module 4 of the power battery system, and is used to collect the thermal runaway substances generated in the battery module 4, and the second port is connected to the confluence section 12, and is used to transmit the collected thermal runaway substances to the confluence section 12.

[0052] The working principle of the above structure is:

[0053] When thermal runaway occurs in the battery module 4, the thermal runaway substances in the battery module 4 will flow from the first port of the current collecting section 11 to the second port, and then flow out of the power battery system through the confluence section 12 and the explosion-proof valve 2. Compared with the prior art in which the thermal runaway substances generated by the battery module 4 will affect other adjacent battery modules 4 when flowing in the pressure relief chamber 43, the above structure directly flows into the guide tube (the current collecting section 11 and the confluence section 12) through the inside of the battery module 4 after thermal runaway occurs in the battery module 4. Since there is a gap between the guide tube and the battery module 4, the thermal runaway substances will be separated from the contact with the battery module 4 after directly flowing into the guide tube, which greatly reduces the risk and degree of heat spread and improves the safety performance of the power battery system.

[0054] See also Figure 3 As shown, further, in order to adapt to the need of some power battery systems to place the battery cell 41 horizontally, the battery module 4 is provided with a battery cell 41 and a pressure relief chamber 43, the large surface of the battery cell 41 is arranged horizontally, the battery cell 41 has a pressure relief valve 42, the pressure relief valve 42 is connected to the pressure relief chamber 43, and the first port is connected to the pressure relief chamber 43.

[0055] Specifically, when the large surface of the battery cell 41 is arranged horizontally, that is, when the battery cell 41 is arranged flat, that is, when the battery cell 41 is placed horizontally, the conventional pressure relief chamber 43 structure cannot achieve pressure relief. The above structure adopts a combination of the pressure relief chamber 43 and the guide tube, so that when the battery cell 41 is placed horizontally, the thermal runaway substances leaked into the pressure relief chamber 43 by the pressure relief valve 42 can be discharged, thereby reducing the risk of heat spread in the power battery system.

[0056] See also Figure 1-Figure 3 As shown, in some embodiments, when the power battery system is provided with more than one group of battery modules 4, that is, the power battery system is provided with N battery modules 4 (N≥1), the collecting section 11 is provided with N strips, wherein each first port is connected to each battery module 4 in a one-to-one correspondence, at least one second port is connected to the collecting section 12, and the other second ports are directly / indirectly connected to the collecting section 12.

[0057] Specifically, when the power battery system is provided with N battery modules 4, the corresponding collecting sections 11 are provided with N, and the first ports of the N collecting sections 11 are connected to the pressure relief chambers 43 of the N battery modules 4 one by one, and at least one second port of the N collecting sections 11 is connected to the bus section 12, and the remaining second ports can be directly connected to the bus section 12, that is, the second port is directly connected to the bus section 12, and the bus section 12 is connected to the second ports of all the collecting sections 11.

[0058] Of course, as needed, a check valve or the like may be provided at the opening to prevent adjacent thermal runaway substances from flowing into other battery modules 4 during the process of flowing toward the explosion-proof valve 2 .

[0059] Reference Figure 1-Figure 2 As shown, in some embodiments, the power battery system is also provided with N battery modules 4, and the current collecting section 11 is provided with N strips on the structural basis, wherein each first port is connected with each battery module 4 one by one, and an opening is provided between the first port and the second port of the current collecting section 11. In the direction toward the bus section 12, the second port of the current collecting section 11 close to the bus section 12 is connected with the bus section 12, and the remaining second ports are connected with the openings on the adjacent bus sections 11 in turn.

[0060] Specifically, the first port of each current collecting section 11 is installed corresponding to one of the battery modules 4, and is used to prepare to collect thermal runaway substances that may be generated in each battery module 4. An opening is set between the first port and the second port of the current collecting section 11, and the opening is used to communicate with the adjacent second port to achieve the sequential connection of the current collecting sections 11, facilitate the design of the guide tube, and reduce the occupied volume of the pressure relief assembly in the power battery system.

[0061] In some embodiments, the explosion-proof valve 2 is directly connected to the confluence section 12, and the collecting section 11 is used to connect the pressure relief chamber 43 between two adjacent battery modules 4, thereby realizing the collection and discharge of thermal runaway substances in the case of multiple battery modules 4.

[0062] In some embodiments, the confluence section 12 in the flow guide pipe is the main pipe, and the collecting section 11 is the branch pipe. One end of all the branch pipes is connected to the pressure relief chamber 43 of the battery module 4, and the other end is connected to the main pipe. The above structure forms a reliable pressure relief pipe 31 with a simple pipe network structure. Similarly, the designer can set a check valve at the branch pipe according to the use requirements to prevent thermal runaway substances from flowing into other normal battery modules 4.

[0063] See also Figure 1 As shown, in some embodiments, in order to facilitate the installation of the pressure relief valve 42, the housing 5 of the power battery system is provided with an assembly hole 51, and the explosion-proof valve 2 is installed at the assembly hole 51. The assembly hole 51 facilitates the installation of the explosion-proof valve 2, and the explosion-proof valve 2 is convenient for connecting the inside and outside of the power battery system. In addition, a structure for fixing the explosion-proof valve 2, such as a buckle, a screw hole 33, etc., can also be provided at the assembly hole 51. In this embodiment, a threaded hole is provided at the assembly hole 51 of the housing 5, and the explosion-proof valve 2 is provided with threaded holes corresponding to the number and position of the threaded holes. The bolts pass through the threaded holes provided at the assembly hole 51 and the threaded holes provided on the explosion-proof valve 2 to complete the fixing of the explosion-proof valve 2 to the housing 5.

[0064] See also Figure 1-Figure 5 As shown, in some embodiments, in order to improve the sealing performance of the connection between the explosion-proof valve 2 and the assembly hole 51, a sealing structure 6 is provided at the connection between the explosion-proof valve 2 and the assembly hole 51, wherein the sealing structure 6 can ensure the sealing performance of the connection between the explosion-proof valve 2 and the assembly hole 51, and prevent thermal runaway substances from escaping from the joint between the explosion-proof valve 2 and the assembly hole 51.

[0065] See also Figure 1-Figure 5 As shown, specifically, the sealing structure 6 can be a sealing ring, a sealing strip 8 or a sealant, etc., which can strengthen the airtightness of the explosion-proof valve 2 and the assembly hole 51. A sealing ring is used in the present embodiment. The sealing ring is sleeved on the side of the explosion-proof valve 2 facing the housing 5. When the explosion-proof valve 2 is assembled, the sealing ring seals the contact between the explosion-proof valve 2 and the assembly hole 51, thereby improving the sealing of the explosion-proof valve 2 and the assembly hole 51.

[0066] See also Figure 1-Figure 5 As shown, in some embodiments, in order to facilitate the connection between the explosion-proof valve 2 and the confluence section 12, a structural cover plate 3 is provided between the explosion-proof valve 2 and the confluence section 12, the structural cover plate 3 is connected to the explosion-proof valve 2, and a confluence cavity 7 is formed between the structural cover plate 3 and the explosion-proof valve 2, and the confluence cavity 7 is used to preliminarily collect the thermal runaway materials discharged from the confluence section 12, and the confluence section 12 is connected to the confluence cavity 7 through the structural cover plate 3.

[0067] See also Figure 1-Figure 5 As shown, further, the structural cover plate 3 is provided with a pressure relief pipe 31, the pressure relief pipe 31 is connected to the confluence section 12, and the pressure relief pipe 31 is connected to the confluence cavity 7. The specific structural cover plate 3 is provided with a pressure relief pipe 31 that facilitates the connection of the confluence section 12, and the connection between the confluence section 12 and the pressure relief pipe 31 can facilitate the assembly of the structural cover plate 3 and the pressure relief pipe 31. Of course, the confluence section 12 and the pressure relief pipe 31 can also be connected in an indirect connection. For example, in this embodiment, the confluence section 12 is connected through the U-shaped pipe 9.

[0068] Based on the above structure, the structure of the explosion-proof valve 2 is mainly divided into two types:

[0069] First, see Figure 1-Figure 5 As shown, the explosion-proof valve 2 is provided with an extension tube 21, the housing 5 of the power battery system is provided with an assembly hole 51, the extension tube 21 is provided through the assembly hole 51, and the structural cover plate 3 is threadedly connected to the extension tube 21. The above structure adopts the method of providing the extension tube 21 on the explosion-proof valve 2. By passing the extension tube 21 through the assembly hole 51 and then threading it with the structural cover plate 3, the confluence cavity 7 formed by the explosion-proof valve 2 and the structural cover plate 3 can be made more airtight, and the assembly of the explosion-proof valve 2 and the structural cover plate 3 is also more convenient. Regarding the threaded connection between the structural cover plate 3 and the extension tube 21, the structural cover plate 3 and the extension tube 21 can be threadedly connected by mutually matching threads.

[0070] Second, see Figure 6-Figure 9 As shown, the outer edge of the structural cover plate 3 extends to form a flange 32, and the structural cover plate 3 is fixedly connected to the outer shell 5 through the flange 32. The structural cover plate 3 is fixed to the outer shell 5 through the flange 32, which greatly improves the air tightness of the connection between the structural cover plate 3 and the outer shell 5.

[0071] In this embodiment, in order to further improve the airtightness of the connection between the structural cover plate 3 and the shell 5, a sealing strip 8 is provided between the flange 32 and the shell 5. The sealing strip 8 is provided along the flange 32 on the covering surface of the shell 5, and a limiting protrusion 34 is provided on the side of the flange 32 facing the sealing strip 8. The limiting protrusion 34 can control the distance between the flange 32 and the shell 5, thereby controlling the compression amount of the sealing strip 8, and ensuring the airtightness and stability of the sealing strip 8.

[0072] Furthermore, the flange 32 is mounted on the housing 5 by bolts, the flange 32 is provided with screw holes 33 for the bolts to pass through, the limiting protrusion 34 is arranged along the aperture edge of the screw hole 33, the sealing strip 8 is provided with an avoidance hole 81 at the corresponding position of the screw hole 33, and the limiting protrusion 34 is arranged through the avoidance hole 81. The above structure is provided with the limiting protrusion 34 at the screw hole 33 of the flange 32, and the sealing strip 8 is provided with the avoidance hole 81 corresponding to the limiting protrusion 34, and the limiting protrusion 34 passes through the avoidance hole 81 and abuts against the housing 5, so as to control the compression amount of the sealing strip 8, prevent the problem of excessive compression of the sealing strip 8, thereby improving the sealing and stability of the sealing strip 8. In addition, the cooperation between the avoidance hole 81 and the limiting protrusion 34 also facilitates the positioning and installation of the sealing strip 8.

[0073] Of course, the designer can also set the number and position of the screw holes 33 as needed, and correspondingly set the number and position of the limiting protrusions 34 and the avoidance holes 81, so as to improve the contact stability between the limiting protrusions 34 and the housing 5.

[0074] In addition, the flow guide tubes in the present invention can be provided with multiple ones according to the requirements, and the connection method thereof can adopt one of the above connection methods. In the present embodiment, two flow guide tubes are provided to increase the flux per unit time, thereby improving the safety of the power battery system.

[0075] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A power battery system pressure relief component, used in a power battery system, characterized in that: include: A flow guide pipe, the flow guide pipe comprising a current collecting section (11) and a current converging section (12), the current collecting section (11) comprising a first port and a second port, the first port being in communication with a battery module (4) of the power battery system, and the second port being in communication with the current converging section (12); an explosion-proof valve (2), one end of the explosion-proof valve (2) being connected to the confluence section (12), and the other end of the explosion-proof valve (2) being connected to the outside of the power battery system; Wherein, a gap is left between the current collecting section (11) and the current converging section (12) and the battery cells in the power battery system.

2. A power battery system pressure relief assembly according to claim 1, characterized in that: The battery module (4) is provided with a battery cell (41) and a pressure relief chamber (43); the large surface of the battery cell (41) is arranged horizontally; the battery cell (41) has a pressure relief valve (42); the pressure relief valve (42) is in communication with the pressure relief chamber (43); and the first port is in communication with the pressure relief chamber (43).

3. A power battery system pressure relief assembly according to claim 1, characterized in that: The power battery system is provided with N battery modules (4), and the current collecting sections (11) are provided with N strips, wherein each of the first ports is connected to each of the battery modules (4) in a one-to-one correspondence, and the second port is connected to the current collecting section (12).

4. A power battery system pressure relief assembly according to claim 1, characterized in that: The power battery system is provided with N battery modules (4), and the current collecting sections (11) are provided with N strips, wherein each of the first ports is connected to each of the battery modules (4) in a one-to-one correspondence, an opening is provided between the first port and the second port of the current collecting section (11), and in a direction toward the converging section (12), the second port of the current collecting section (11) close to the converging section (12) is connected to the converging section (12), and the remaining second ports are connected in sequence to the openings on adjacent current collecting sections (11).

5. A power battery system pressure relief assembly according to claim 1, characterized in that: The housing (5) of the power battery system is provided with an assembly hole (51), and the explosion-proof valve (2) is installed at the assembly hole (51).

6. A power battery system pressure relief assembly according to claim 5, characterized in that: A sealing structure (6) is provided at the connection between the explosion-proof valve (2) and the assembly hole (51).

7. A power battery system pressure relief assembly according to any one of claims 1 to 6, characterized in that: A structural cover plate (3) is provided between the explosion-proof valve (2) and the confluence section (12); the structural cover plate (3) is connected to the explosion-proof valve (2); a confluence chamber (7) is formed between the structural cover plate (3) and the explosion-proof valve (2); and the confluence section (12) is connected to the confluence chamber (7) via the structural cover plate (3).

8. A power battery system pressure relief assembly according to claim 7, characterized in that: The structural cover plate (3) is provided with a pressure relief pipe (31), one end of the pressure relief pipe (31) is in communication with the confluence section (12), and the other end of the pressure relief pipe (31) is in communication with the confluence chamber (7).

9. A power battery system pressure relief assembly according to claim 7, characterized in that: The explosion-proof valve (2) is provided with an extension tube (21), the housing (5) of the power battery system is provided with an assembly hole (51), the extension tube (21) is arranged through the assembly hole (51), and the structural cover plate (3) is threadedly connected to the extension tube (21).

10. A power battery system pressure relief assembly according to claim 9, characterized in that: The outer edge of the structural cover plate (3) extends to form a flange (32), and the structural cover plate (3) is fixedly connected to the outer shell (5) via the flange (32).

11. A power battery system pressure relief assembly according to claim 10, characterized in that: A sealing strip (8) is provided between the flange (32) and the outer shell (5); the sealing strip (8) is arranged along the flange (32) on the covering surface of the outer shell (5); and a limiting protrusion (34) is provided on a side of the flange (32) facing the sealing strip (8).

12. A power battery system pressure relief assembly according to claim 11, characterized in that: The flange (32) is mounted on the housing (5) by means of bolts. The flange (32) is provided with a screw hole (33) for the bolt to pass through. The limiting protrusion (34) is arranged along the aperture edge of the screw hole (33). The sealing strip (8) is provided with an avoidance hole (81) at a corresponding position of the screw hole (33). The limiting protrusion (34) is arranged through the avoidance hole (81).

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