Pressure relief device mounting base

Abstract

To provide a mounting pedestal of a pressure relief device for releasing a gas accumulated in a battery pack, when a pressure becomes higher than a prescribed value.SOLUTION: A mounting pedestal 3505 of a pressure relief device 101 includes a main body part 301, a restraining part 302, and a lag 303. The main body part 301 has a circular cross section. The restraining part 302 is disposed on an outer surface of the main body part 301 in a circumferential direction, and formed in a manner of being projected outward from the outer surface of the main body part 301. The lag 303 is disposed below the restraining part 302 and separated from the restraining part 302 by a certain distance. The lag 303 is projected outward from the outer surface of the main body part 301. The pressure relief device 101 can be mounted on a housing of a battery pack in a fixed manner by being rotated without requiring additional mounting components or tools, so that a mounting process of the battery pack can be significantly simplified.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present application relates to a pressure relief device, and more particularly to a mounting base for a pressure relief device of a battery pack. [Background technology]

[0002] Batteries generate gas during use. If the gas is not released in a timely manner and accumulates in the battery pack, the pressure in the battery pack will increase, affecting the use of the battery pack. Therefore, during the manufacture of batteries, it is often necessary to install a pressure relief device on the battery pack. When the pressure in the battery pack is higher than a predetermined value, the pressure relief device can automatically open to release the gas accumulated in the battery pack and relieve the internal excess pressure. Summary of the Invention

[0003] The present application provides a mounting base for a pressure relief device. The mounting base includes a body portion, a restraining portion, and at least one lug. The body portion has an insert portion. The restraining portion is disposed at an upper end of the insert portion and extends outward from the body portion. The at least one lug is disposed at the insert portion and extends outward from the insert portion. The at least one lug is located below the restraining portion, and a clamp space is formed between the at least one lug and the restraining portion. In the present application, the restraining portion is disposed at an upper end of the insert portion of the mounting base for the pressure relief device, the lug is disposed at the insert portion, and due to a matching relationship between the restraining portion, the lug, and the mounting hole, only two steps are required to fixedly mount the pressure relief device to the battery pack by the restraining portion and the lug, without requiring additional mounting parts and mounting tools, namely, a step of inserting the insert portion into the mounting hole and a step of rotating the insert portion, thereby greatly simplifying the assembly steps of the pressure relief device.

[0004] In the mounting seat of the pressure relief device described above, the insert portion is in the form of a cylindrical sleeve and at least one lug extends outwardly from an outer circumferential surface of the insert portion.

[0005] In the mounting base of the pressure relief device described above, the at least one lug includes a pair of lugs, the pair of lugs being symmetrically disposed about the axis of the insertion portion.

[0006] In the mounting base of the pressure relief device described above, at least one lug comprises a resilient arm and a housing part. A proximal end of the resilient arm is connected to the insertion part, and a distal end of the resilient arm is a free end. The housing part is connected to the insertion part, and a housing space is provided in the housing part, and the housing space is configured to at least partially house the resilient arm. When the resilient arm is in a free state, the resilient arm is at least partially located above an upper surface of the housing part.

[0007] The mounting base of the pressure relief device described above is provided at its free end with a protrusion extending towards the restraining portion.

[0008] In the mounting base of the pressure release device described above, the insertion portion is configured to be insertable into a mounting hole of the component, the wall of the mounting hole is provided with at least one notch for receiving the at least one lug, the restraining portion is configured to be positioned outside the mounting hole when the insertion portion is inserted into the mounting hole, and the at least one lug is configured to be insertable into the mounting hole by aligning with the at least one notch, and after the insertion portion is inserted into the mounting hole and rotated so that the at least one lug and the at least one notch are staggered, a portion of the component around the mounting hole is clamped in the clamping space.

[0009] In the mounting base of the above-mentioned pressure release device, at least one slot is provided in the wall of the mounting hole, and the at least one slot and the at least one notch are staggered, and the at least one slot is configured to be capable of receiving the elastic arm of the at least one lug.

[0010] The mounting seat of the above mentioned pressure relief device further comprises a sealing ring, which is fixed to the lower surface of the restraining portion.

[0011] In the mounting base of the pressure relief device described above, the main body portion further has a head, the head being connected to the upper end of the insertion portion at the connection end of the head, the head and the insertion portion together forming a fluid passage, and the restraint portion surrounding the connection end of the head and extending outwardly from the head.

[0012] In the mounting seat of the pressure relief device described above, the head is in the form of a cylindrical sleeve and the restraining portion is an annular flange.

[0013] The pressure relief device of the present application has a unique mounting structure and can be attached to the external housing of the battery pack by rotating it. The pressure relief device can be attached to the battery pack without the need for external mounting parts and tools, which greatly simplifies the assembly steps of the battery pack and reduces the production cost of the battery pack. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of a battery pack 100 using a pressure relief device 101 according to one embodiment of the present application. [Figure 2A] 2 is a partial perspective view of the pressure relief device 101 and the top plate 105 of the battery pack 100 as viewed from the outside of the battery pack 100 of FIG. 1. [Figure 2B] 2 is a partial perspective view of a pressure relief device 101 and a top plate 105 of the battery pack 100 as viewed from the inside of the battery pack 100 of FIG. 1. [Figure 3A] FIG. 2 is a perspective view of the pressure relief device 101 of FIG. [Figure 3B] FIG. 3B is an exploded view of the pressure relief device 101 of FIG. 3A. [Figure 3C] 3B is an axial cross-sectional view of the pressure relief device 101 of FIG. 3A taken along line AA of FIG. 3A. [Figure 3D]3B is an axial cross-sectional view of the pressure relief device 101 of FIG. 3A taken along a line at a 90 degree angle to line of sight AA of FIG. 3A. [Figure 3E] FIG. 3D is a cross-sectional view taken along the line CC of FIG. 3C. [Figure 4] 2 is a longitudinal cross-sectional view of the pressure relief device 101 of FIG. 1 in a concentrated pressure relief state. [Diagram 5] FIG. 2B is a partial perspective view of the top plate of the battery pack 100 of FIG. 2A. [Figure 6A] 6 is a schematic diagram of a step of attaching the pressure relief device 101 of FIG. 1 to the top plate 105 of the battery pack 100 shown in FIG. 5. [Figure 6B] 6 is a schematic diagram of a step of attaching the pressure relief device 101 of FIG. 1 to the top plate 105 of the battery pack 100 shown in FIG. 5. [Figure 7A] 2B is an axial cross-sectional view of the pressure relief device 101 attached to the top plate 105 of the battery pack 100 of FIG. 2A taken at different positions. [Figure 7B] 2B is an axial cross-sectional view of the pressure relief device 101 attached to the top plate 105 of the battery pack 100 of FIG. 2A taken at different positions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Certain embodiments of the present disclosure are described below with reference to the accompanying drawings, which form a part of this specification. Although directional terms such as "front", "back", "upper", "lower", "left" and "right" are used in this disclosure to describe various exemplary structures and structural elements, it should be understood that these terms used in this specification are used merely for ease of description and are determined based on the exemplary orientation shown in the accompanying drawings. Since the embodiments disclosed in this disclosure can be arranged in different orientations, these directional terms are merely exemplary and should not be understood as limiting. Where possible, the same or similar reference numbers used in this disclosure refer to the same components.

[0016] FIG. 1 shows a schematic diagram of a battery pack 100 using a pressure relief device 101 according to an embodiment of the present application. As shown in FIG. 1, the battery pack 100 is generally rectangular. In other embodiments, the battery pack 100 may have other shapes. The battery pack 100 includes a battery pack housing 102 and a pressure relief device 101. The battery pack housing 102 has an accommodation space formed therein for accommodating battery cells (not shown). The pressure relief device 101 is attached to a top plate 105 of the battery pack housing 102 and communicates with the accommodation space in the battery pack housing 102, and can release pressure in the accommodation space in the battery pack housing 102.

[0017] 2A is a partial perspective view of the pressure relief device 101 seen from the outside of the battery pack 100 in FIG. 1 and a top plate 105 of the battery pack 100, showing the structure of the pressure relief device 101 outside the battery pack housing 102. FIG. 2B is a partial perspective view of the pressure relief device 101 seen from the inside of the battery pack 100 in FIG. 1 and a top plate of the battery pack 100, showing the structure of the pressure relief device 101 inside the battery pack housing 102. As shown in FIGS. 2A and 2B, the battery pack housing 102 is provided with a mounting hole 230, and the pressure relief device 101 is mounted to the battery pack housing 102 through the mounting hole 230. The lower part of the pressure relief device 101 passes through the mounting hole 230 and extends into the battery pack 100, and the upper part of the pressure relief device 101 is exposed to the external environment. When the gas pressure in the battery pack 100 reaches or exceeds a predetermined value, the pressure relief device 101 can release the gas in the battery pack 100 intensively to the external environment, thereby relieving the pressure in the battery pack 100.

[0018] Figure 3A is a perspective view of the pressure relief device 101 of Figure 1, and Figure 3B shows an exploded view of the pressure relief device 101 of Figure 3A. Figure 3C is an axial cross-sectional view of the pressure relief device 101 of Figure 3A taken along line AA of Figure 3A, Figure 3D is an axial cross-sectional view of the pressure relief device 100 of Figure 3A taken along a line at a 90 degree angle to line AA of Figure 3A, and Figure 3E is a cross-sectional view taken along line CC of Figure 3C. These figures collectively show a specific structure of the pressure relief device 101.

[0019] As shown in Figures 3A and 3B, the pressure relief device 101 includes a protective cover 3501, a pressure relief member 3502, a waterproof gas-permeable membrane 3503, a valve core 3504, a mounting base 3505, and a sealing ring 3506. Both the pressure relief member 3502 and the sealing ring 3506 are in the form of a circular ring and made of an elastic material. In this embodiment, the pressure relief member 3502 and the sealing ring 3506 are made of silica gel or rubber. For example, the pressure relief member 3502 is made of LR or HNBR material, and the sealing ring 3506 is made of VMQ or EPDM material. The cross sections of the protective cover 3501, the waterproof gas-permeable membrane 3503, the valve core 3504, and the mounting base 3505 are generally circular. The waterproof gas-permeable membrane 3503 is made of a waterproof and gas-permeable material, and the protective cover 3501, valve core 3504, and mounting base 3505 are made of materials that are heat resistant and have some rigidity. In this embodiment, the waterproof gas-permeable membrane 3503 is made of ePTFE material. The protective cover 3501, valve core 3504, and mounting base 3505 are made of PA66 material.

[0020] As shown in Figures 3C and 3D, the protective cover 3501 is snapped onto the mounting base 3505 so that the waterproof gas-permeable membrane 3503, the valve core 3504, and the pressure release member 3502 can be contained within the space formed by the mounting base 3505 and the protective cover 3501.

[0021] 3C and 3D in combination with FIG. 3B, the protective cover 3501 includes a top cover 330 and a cover wall 331, the top cover 330 being in the form of a circular flat plate, and the cover wall 331 extending vertically downward from the outer edge of the top cover 330. The protective cover 3501 is provided with a plurality of protective cover through holes 3511 that assist in releasing gas within the pressure relief device 101 to the external environment. The top cover 330 is provided on its inner surface with a plurality of ribs 3460 that abut against the top end of the mounting base 3505. The cover wall 331 is provided with a plurality of notches 380 and a plurality of snap receivers 332 disposed in the notches 380. The inner and outer surfaces of the snap receivers 332 are flush with the inner and outer surfaces of the cover wall 331, respectively. The snap receiver 332 and the side wall of the corresponding notch 380 of the cover wall 331 are separated by a partition slot 333, which extends from the outer edge of the cover wall 331 toward the top cover 330. The partition slot 333 is provided so that the upper end 334 of the snap receiver 332 is connected to the cover wall 331 and a gap is provided between the lower end 335 of the snap receiver 332 and the cover wall 331, so that the lower end 335 of the snap receiver 332 can expand and contract relative to the cover wall 331 when an external force is applied to the lower end 335 of the snap receiver 332. In other words, when an inward force is applied to the lower end 335 of the snap receiver 332, the lower end 335 of the snap receiver 332 bends toward the space surrounded by the cover wall 331, and when an outward force is applied to the lower end 335 of the snap receiver 332, the lower end 335 of the snap receiver 332 bends outward from the space surrounded by the cover wall 331. The snap receiver 332 is provided with a snap hole 336 at a position close to the lower end 335, and the snap hole 336 extends through the inner and outer surfaces of the snap receiver 332 to fit into the snap member 350 on the mounting base 3505 and is used to receive the snap member 350. In this embodiment, six snap receivers 332 are provided on the cover wall 331 of the protective cover 3501. In other embodiments, the number of snap receivers 332 may be different.

[0022] As shown in FIG. 3B-3D, the valve core 3504 includes a valve core body 340 and a valve core mounting member 341. The valve core body 340 has a circular cross section and includes a valve core outer rim 342, a valve core central post 344, and a number of valve core spokes 343. The valve core outer rim 342 is in the form of a ring, and the valve core central post 344 is located at the center of the valve core outer rim 342 and extends along the axis of the valve core 504. The valve core spokes 343 are connected at one end to the valve core central post 344 and at the other end to the valve core outer rim 342. The valve core spokes 343 can be used to support the waterproof gas-permeable thin film 3503. In this embodiment, there are eight valve core spokes 343 in the valve core 3504, and the eight valve core spokes 343 are evenly arranged around the valve core central post 344, so that eight valve core through holes 3514 are formed inside the valve core outer rim 342. The valve core mounting member 341 is formed to extend downward from the valve core central post 344 and is generally perpendicular to the valve core body 340 .

[0023] As shown in Fig. 3C and 3D, the valve core mounting member 341 includes an extension 3422 and a pair of arms 3424. The extension 3422 is generally cylindrical, and a proximal end of the extension 3422 is connected to the valve core body 340. The pair of arms 3424 is connected to a distal end of the extension 3422, and the pair of arms 3424 are separated by a recess 3420. An inclined flange is provided on the outer surfaces of the pair of arms 3424 facing opposite to each other, and the flange extends obliquely outward from the ends of the pair of arms 3424 toward the distal end of the extension 3422. Thus, a stepped snap portion is formed between the outer surfaces of the pair of arms 3424 and the extension 3422. When the pair of arms 3424 are pressed by an external force, the pair of arms 3424 are urged to approach each other in the direction of the recess 3420 until the inner sides of the pair of arms 3424 abut each other. When the external force is removed, the pair of arms 3424 move away from each other and return to their extended positions relative to each other. The above-described configuration of the valve core mounting member 341 makes the valve core mounting member 341 expandable and contractible, allowing the valve core 3504 to be removably mounted to the mounting base 3505.

[0024] As shown in FIG. 3B-FIG. 3D, the waterproof gas-permeable thin film 3503 is a thin circular sheet, the size of which is approximately the same as the cross section of the valve core body 340, so that the waterproof gas-permeable thin film 3503 can closely cover the upper surface of the valve core body 340. The waterproof gas-permeable thin film 3503 can prevent liquid penetration and allow gas to pass through, thereby realizing the effects of dustproof, waterproof and gas permeability. In this embodiment, the waterproof gas-permeable thin film 3503 meets the requirements of IP67. Moreover, in this embodiment, the waterproof gas-permeable thin film 3503 is fixed to the upper surface of the valve core 3504 by ultrasonic welding, and in this case, the valve core spokes 343 are also welded. In other embodiments, the waterproof gas-permeable thin film 3503 can also be connected to the valve core 3504 by other connecting means, such as bonding with adhesive or fixing by a secondary molding process.

[0025] The pressure release member 3502 is in the form of a ring. The pressure release member 3502 has an outwardly extending axial section with an inner edge 3551 forming the inner circumferential surface of the pressure release member 3502 and an outer edge 3553 extending downwardly and outwardly from the inner edge 3551. In a free state, i.e. without interference from an external force, the outer edge 3553 of the pressure release member 3502 extends outwardly from the inner edge 3551 and is below the inner edge 3551. In this embodiment, the pressure release member 3502 has an inner diameter approximately equal to the outer diameter of the valve core body 340 and is fixedly connected to the valve core 3504 by secondary molding such that the inner circumferential surface of the pressure release member 3502 and the outer circumferential surface of the valve core 3504 are closely attached to each other. In other embodiments, other fastening means can be used. For example, the inner diameter of the pressure relief member 3502 is slightly smaller than the outer diameter of the valve core body 340 such that the pressure relief member 3502, by its expandable and contractible nature, is able to securely fit over the outer edge of the valve core 3504. When the pressure relief member 3502 is fitted over the valve core 3504, as shown in Figures 3C and 3D, the pressure relief member 3502 and valve core 3504 are generally formed into an umbrella-like shape.

[0026] As further shown in Figures 3B-3D, the mounting base 3505 has a body portion 301. The body portion 301 is in the form of a cylindrical sleeve having a circular cross section. As shown in Figure 4A, the body portion 301 is divided into a head portion 3431 and an insert portion 3432. The head portion 3431 is connected to an upper end portion 3438 of the insert portion 3432 at a connection end portion 3435 of the head portion. The insert portion 3432 is configured to be inserted into the mounting hole 230, and the head portion 3431 is located outside the mounting hole 230 and is connected to the protective cover 3501.

[0027] The snap member 350 is provided on the outer surface of the head 3431. The snap member 350 is formed to protrude outward from the outer surface of the head 3431. The snap member 350 is used to be snapped into and fitted into the snap receiver 332 on the protective cover 3501. The number of snap members is the same as the number of snap receivers 332. In this embodiment, since six snap receivers 332 are provided on the protective cover 3501, the mounting base 3505 is also provided with six snap members 350 on the outer surface of the head 3431. As can be seen from FIGS. 3B and 3D, the snap member 350 is generally prism-shaped, and its lower surface 3452 is a flat surface perpendicular to the outer surface of the head 3431, and its upper surface 3451 is an inclined surface extending downward from the outer surface of the head 3431. As shown in FIG. 3D , when the protective cover 3501 is snapped onto the mounting base 3505, the protective cover 3501 is fixed to the outside of the head 3431 from above the mounting base 3505, and the inner surface of the protective cover 3501 is closely attached to the outer surface of the head 3431 at the cover wall 331, thereby ensuring a fixed connection between the protective cover 3501 and the mounting base 3505 in the horizontal direction. When the protective cover 3501 is snapped onto the mounting base 3505 from above downward, the snap receivers 332 can expand outward, and the six snap members 350 are respectively accommodated in the snap holes 336 of the six snap receivers 332. In this case, the lower surface 3452 of the snap member 350 abuts against the snap hole 336, and the snap member 350 is configured to fit into the snap hole 336 so as to prevent the protective cover 3501 from moving upward relative to the mounting base 3505. Furthermore, as shown in FIG. 3D , when the protective cover 3501 is snapped onto the top end of the mounting base 3505, the ribs 3460 on the inner surface of the top cover 330 of the protective cover 3501 precisely abut against the top end of the mounting base 505, thereby preventing the protective cover 501 from moving downward relative to the mounting base 505.

[0028] As shown in FIGS. 3B, 3C, and 3D, the head 3431 of the mounting base 3505 has a larger outer diameter than the insert portion 3432. The body portion 301 of the mounting base 3505 has a fluid passageway 3401 therein that passes through the head 3431 and the insert portion 3432. The portion of the fluid passageway 3401 in the head 3431 has a larger inner diameter than the portion of the fluid passageway 3401 in the insert portion 3432, and thus the mounting base 3505 forms an annular support platform 3459 where the head 3431 and the insert portion 3432 join. A support structure 3512 is provided within the fluid passageway 3401, the support structure 3512 being located within the insert portion 3432 and extending inwardly from the support platform 3459. As shown in FIG. 3B, the support structure 3512 includes a central support post 337 and a plurality of support plates 338. The central support post 337 is located at the center of the fluid passage 3401. The support plate 338 has one end fixed to the central support post 337 and the other end fixed to the inner wall of the main body portion 301, so that the multiple support plates 338 are arranged radially in the fluid passage 3401. In this embodiment, there are a total of six support plates 338, and the six support plates 338 divide the fluid passage 3401 into six sub-passages 339, and each sub-passage 339 has a vertically communicating structure. The support structure 3512 has a relatively large height at the position where the central support post 337 is located, so that the central support post 337 can be used to engage with and support the valve core 3504. As shown in FIG. 3C, the central support post 337 is provided with a mounting member through hole 3510. The inner diameter of the mounting member through hole 3510 is approximately equal to the outer diameter of the extension 3422 of the valve core mounting member 341, so that the extension 3422 of the valve core 340 can be accurately received in the mounting member through hole 3510 of the mounting base 3505. When the valve core 3504 is engaged onto the central support post 337 by the pair of arms 3424 of the valve core mounting member 341, the lower surface of the central portion of the valve core body 340 is accurately attached to the upper surface of the central support post 337, limiting the upward and downward movement of the valve core 3504 relative to the mounting base 3505.

[0029] The mounting base 3505 further includes a restraining portion 302 and a pair of lugs 303. The restraining portion 302 and the pair of lugs 303 cooperate to hold the mounting base 3505 in the mounting hole 230 of the top plate 105 of the battery pack 100. The restraining portion 302 is disposed at the upper end of the insertion portion 3432 and protrudes outward from the body portion 301. In the illustrated embodiment, the restraining portion 302 is disposed at the connection end 3435 of the head portion 3431 and is formed to have a flange shape around the connection end 3435 of the head portion 3431. In some embodiments, if the size of the restraining portion 302 is configured such that the restraining portion 302 cannot be inserted into the mounting hole 230, the restraining portion 302 can also extend directly from the upper end 3438 of the insertion portion 3432.

[0030] The pair of lugs 303 are disposed on the outer circumferential surface of the insertion portion 3432, and therefore the lugs 303 are located below the restraining portion 302. The lugs 303 are separated from the restraining portion 302 by a certain distance to form a clamping space 3900. The height of the clamping space 3900 is equal to the thickness of the top plate 105 of the battery pack housing 102 or slightly larger than the thickness of the battery pack housing 102 so that the battery pack housing 102 can be accurately clamped between the restraining portion 302 and the insertion portion 3432.

[0031] As shown in FIG. 3D, the lower surface of the restraining part 302 is flush with the lower edge of the head part 3431, and the lower surface of the restraining part 302 is provided with a seal ring groove 3455 for receiving a seal ring 3506. As can be seen from FIG. 3C in combination with FIG. 3A, the inner side of the seal ring groove 3455 is formed as a circular ring-shaped platform 3456, and the outer side is formed with a plurality of outer abutment elements 3457, which are spaced apart along the outer edge of the restraining part 302. As shown in FIG. 3A, some of the outer abutment elements 3457 are independently arranged on the lower surface of the restraining part 302, and as for the rest of the outer abutment elements 3457, their ends close to the outer edge of the restraining part 302 are connected together by a connecting bar 3458, and their ends facing the body part 301 are still arranged separately. 3A shows five outer abutment elements 3457, two of which located on two radial sides of the restraining part 302 are arranged independently, and the outer ends of the remaining three outer abutment elements 3457 arranged between the two outer abutment elements 3457 mentioned above are connected together by a connecting bar 3458. The circular ring-shaped platform 3456 and the outer abutment elements 3457 are configured to match each other so that a seal ring groove 3455 is formed on the underside of the restraining part 302 that engages with the seal ring 3506.

[0032] As shown in Figures 3A, 3B, and 3C, a pair of lugs 303 of the mounting base 3505 extend outward from the outer surface of the insertion portion 3432 and are arranged symmetrically with respect to the axis of the insertion portion 3432. As shown in Figures 3C and 3E, each of the lugs 303 includes an elastic arm 3701 and a storage portion 3702. A proximal end 3711 of the elastic arm 3701 is connected to the insertion portion 3432, and a distal end 3712 of the elastic arm 3701 is a free end, and a protrusion 3704 extending or protruding toward the restraining portion 302 is provided on its upper surface. The storage portion 3702 is connected to the insertion portion 3432, and a storage space 3703 is provided within the storage portion 3702. The accommodation portion 3702 is U-shaped, and the open end of the U is connected to the outer surface of the insertion portion 3432, so that the accommodation portion 3702 and the insertion portion 3432 together form an accommodation space 3703. As shown in FIG. 3C, in the free state, most of the elastic arm 3701 is accommodated in the accommodation space 3703 of the accommodation portion 3702. The upper surface of the elastic arm 3701 is generally flush with the upper surface of the accommodation portion 3702, but the protrusion 3704 of the distal end 3712 of the elastic arm 3701 is higher than the upper surface of the accommodation portion 3702. When a downward force is applied to the free end 3712 of the elastic arm 3701, the distal end 3712 of the elastic arm 3701 can move downward, and the entire elastic arm 3701 is accommodated in the accommodation space 3703 of the accommodation portion 3702.

[0033] 3B and 3C, the mounting base 3505 also has a plurality of openings 3403 in the head 3431, the plurality of openings 3403 being disposed at the upper edge of the restraining portion 302, and passing through the head 3431, such that gas in the fluid passage 3401 can be released to the external environment through the openings 3403. The openings 3403 are elongated, the length direction of the openings 3403 corresponds to the circumferential direction of the head 3431, and the plurality of openings 3403 are spaced apart in the circumferential direction of the head 3431. In this embodiment, the head 3431 is provided with six openings 3403, but in other embodiments, the number of openings 3403 may be different.

[0034] The seal ring 3506 has a circular ring shape and is accommodated in the seal ring groove 3455 of the mounting base 3505. As shown in FIG. 3A and 3D, when the seal ring 3506 is engaged in the seal ring groove 3455, the inner side of the seal ring 3506 fits on the outer surface of the circular ring-shaped platform 3456, and the outer side of the seal ring 3506 abuts on the inner edge of the outer abutment element 3457. In this embodiment, the seal ring 3506 and the seal ring groove 3455 are engaged together by interference fit. Because there is a space between the multiple outer abutment elements 3457 arranged separately, the interference-fitted seal ring 3506 is over-extruded, thereby ensuring not only the fixed engagement between the seal ring 3506 and the seal ring groove 3455, but also the close engagement between the seal ring 3506 and the seal ring groove 3455. In another embodiment, the seal ring 3506 can be fixed to the lower surface of the mounting base 3505 by secondary molding.

[0035] To assemble the pressure relief device 101, first, the pressure relief member 3502 can be fixedly connected to the valve core 3504 by secondary molding, and the waterproof gas-permeable thin film 3503 is fixed to the upper surface of the valve core 3504 by ultrasonic welding, then the valve core 3504 with the pressure relief member 3502 and the waterproof gas-permeable thin film 3503 fixed thereon is engaged onto the support structure 3512 of the mounting base 3505, and finally, the protective cover 3501 is fixed onto the mounting base 3505 by a snap connection. 3C and 3D, the support structure 3512 has a relatively large height at the central support post 337 so that when the valve core 3504 with the pressure release member 3502 disposed thereon is aligned with the fluid passage 3401 and engages on the support structure 3512 of the mounting base 3505, the central portion of the valve core body 340 abuts the support structure 3512 and the edges of the valve core body 340 are suspended above the support structure 3512, thus forming a pressure release passage 3402 between the outer edge of the valve core 3504 and the inner wall of the fluid passage 3401 of the mounting base 3505 (as shown in FIG. 4).

[0036] FIG. 4 is a cross-sectional view of the pressure relief device 101 of FIG. 1 in a concentrated pressure relief state, illustrating the deformation of the pressure relief member 3502 in the concentrated pressure relief state.

[0037] In use, the bottom of the pressure release device 101 faces the component that receives the pressure release. In this embodiment, the component that receives the pressure release is the battery pack 100. The mounting base 3505 has a fluid passage 3401 inside, so that the underside of the pressure release member 3502 in the pressure release device 101 communicates with the inside of the battery pack 100. The underside of the internal pressure release member 3502 is the pressure receiving side. As shown in FIG. 3C, in the free state, the pressure release member 3502 extends obliquely downward, and the outer edge of the pressure release member 3502 abuts against the support platform 3459 inside the mounting base 3505, thereby closing the pressure release passage 3402 and putting the pressure release member 3502 into a closed operating state. The pressure release member 3502 is made of an elastic material and can be deformed by the action of an external force. However, when the pressure inside the battery pack 100 is less than a predetermined value, the pressure received by the pressure release member 3502 is small and the degree of deformation is small, which is not enough to open the pressure release passage 3402. In this case, since the protective cover 3501 and the valve core 3504 are both provided with through holes, the gas inside the battery pack 100 can be slowly released to the external environment through the waterproof gas-permeable membrane 3503.

[0038] As shown in FIG. 4, when the gas pressure in the battery pack 100 exceeds a predetermined value, that is, when the gas pressure under the pressure release member 3502 becomes relatively large, the pressure release member 3502 is deformed, and the outer edge of the pressure release member 3502 is bent upward, so that the pressure release passage 3402 is opened and the pressure release member 3502 is in an opening operation state. The opening 3403 in the head 3431 is provided immediately outside the pressure release passage 3402 and above the support platform 3459, so that the gas leaking from the pressure release passage 3402 can be quickly released directly to the external environment through the opening 3403. When the pressure release member 3502 is deformed and opened to release pressure, the waterproof gas-permeable membrane 3503 can also play the role of permeability. However, the permeation efficiency of the waterproof gas-permeable membrane 3503 is much lower than the permeation efficiency caused by the opening of the pressure release member 3502. When a sufficient time has elapsed for pressure release and the gas pressure in the battery pack 100 falls below a predetermined value, the pressure release member 3502 returns to the initial state shown in FIG. 3C again, the pressure release passage 3402 is closed, and the gas is discharged from the battery pack 100 only through the waterproof gas-permeable thin film 3503. That is, when the pressure in the battery pack 100 does not reach a predetermined value, the gas permeation function of the battery pack 100 is achieved by the waterproof gas-permeable thin film 3503. Also, when the pressure in the battery pack 100 is equal to or greater than a predetermined value, the battery pack 100 quickly releases pressure through the pressure release member 3502. In this case, the waterproof gas-permeable thin film 3503 also plays a role of permeability, but the pressure release speed through the waterproof gas-permeable thin film 3503 is slow.

[0039] The present application uses a structure in which the valve core 3504 and the mounting base 3505 cooperate with each other to define the pressure release passage 3402 in the pressure release device 101. The elasticity of the pressure release member 3504 is used to open and close the pressure release passage 3402, thereby releasing the pressure in the battery pack 100. The unique structure of the pressure release device 101 is not damaged every time the pressure release member 3504 opens and releases pressure, so the pressure release device 101 of the present application can be reused without replacing the pressure release device 101 with a new one after pressure release, thereby greatly reducing the cost of using the pressure release device 101. Furthermore, the predetermined pressure value at which the pressure release device 101 of the present application can release pressure can be adjusted based on the selection of the material of the pressure release member 3502. When the pressure release member 3502 has a relatively high elasticity and a relatively low hardness, the predetermined pressure value of the pressure release device 101 is relatively low. Also, when the pressure release member 3502 has a relatively low elasticity and a relatively high hardness, the predetermined pressure value of the pressure release device 101 is relatively high. In the present application, the pressure release member 3502 is prepared using LR or HNBR material. When the pressure in the battery pack 100 is relatively low, the pressure release device 101 of the present application can perform pressure release, thereby effectively ensuring the installation and use of the battery pack 100.

[0040] FIG. 5 shows a partial perspective view of the top plate 105 of the battery pack 100 of FIG. 2A, and shows a specific structure of the mounting hole 230 in the top plate 105. As shown in FIG. 5, a pair of notches 5313 and a pair of slots 5314 are provided in the wall of the mounting hole 230. The mounting hole 230 is generally circular, and the diameter of the mounting hole 230 is equal to or slightly larger than the cross-sectional diameter of the insertion portion 3432. The number of the notches 5313 is the same as the number of the lugs 303 in the pressure relief device 101, and the number of the slots 5314 is the same as the number of the elastic arms 3701 in the pressure relief device 101. A pair of notches 5313 and a pair of slots 5314 are provided corresponding to the mounting hole 230, corresponding to the pair of lugs 303 and the pair of elastic arms 3701 in the pressure relief device 101 of this embodiment. The pair of notches 5313 and the pair of slots 5314 are symmetrically disposed about the center of the mounting hole 230, and the pair of slots 5314 and the pair of notches 5313 are staggered. In the illustrated embodiment, the pair of notches 5313 and the pair of slots 5314 are spaced apart at four quadrant locations in the wall of the mounting hole 230. The notches 5313 are sized to receive the lugs 303 of the mounting base 505, and the slots 5314 are sized to receive the resilient arms 701 of the lugs 303.

[0041] Figures 6A and 6B are schematic diagrams of the installation of the pressure relief device 101 of Figure 3A to the top plate 105 of the battery pack 100 shown in Figure 5. For ease of illustration, Figures 6A and 6B show the mounting and mating relationship between the pressure relief device 101 and the battery pack housing 102 in a cross-sectional view of the pressure relief device 101 taken along line CC of Figure 3C.

[0042] As shown in FIG. 6A , when the pressure relief device 101 is attached to the top plate 105 of the battery pack housing 102 from the outside of the battery pack 100, the pair of lugs 303 of the pressure relief device 101 are aligned with the pair of notches 5313 in the mounting hole 230 of the top plate 105, respectively, and then the insertion portion 3432 of the pressure relief device 101 is inserted into the mounting hole 230. The pressure relief device 101 is further inserted until the pair of lugs 303 move to a position below the top plate 105 of the battery pack housing 102. Since the cross-sectional area of ​​the restraining portion 302 is larger than the cross-sectional area of ​​the mounting hole 230, the restraining portion 302 abuts against the top plate 105. Then, the pressure relief device 101 is rotated 90 degrees relative to the top plate 105. During the rotation, the two elastic arms 3701 on the lugs 303 always abut against the lower surface of the battery pack housing 102. After rotating 90 degrees, the pair of elastic arms 701 reach the position of the pair of slots 5314 respectively, and the distal ends 3712 of the pair of elastic arms 3701 spring upward to be partially received in the corresponding slots 5314, thereby mounting the pressure relief device 101 at a proper position in the mounting hole 230. Due to the engagement and matching relationship between the elastic arms 3701 and the slots 5314, the pressure relief device 101 and the mounting hole 230 are not easily moved relative to each other, thereby positioning the pressure relief device 101 and preventing the pressure relief device 101 from rotating relative to and disengaging from the battery pack housing 102 during the process of mounting the pressure relief device 101 in the battery pack housing 102. When the lug 303 is rotated out of the position of the notch 5313, the rotated lug 303 abuts against the underside of the battery pack housing 102 and cooperates with the stop portion 302 on the upper surface of the battery pack housing 102 to clamp the top plate 105 of the battery pack housing 102 within the clamp space 3900, thereby fixing the pressure relief device 101 on the battery pack housing 102 and limiting the vertical movement of the pressure relief device 101 relative to the battery pack housing 102.

[0043] 7A and 7B are axial cross-sectional views of the pressure relief device 101 attached to the top plate 105 of the battery pack 100 of FIG. 2A, taken at different positions, showing the fitting relationship between the sealing ring 3506 and the top plate 105 of the battery pack 100. As shown in FIGS. 7A and 7B, the pressure relief device 101 is attached to a position in the mounting hole 230 in the battery pack housing 102, with the head 3431 generally located above the battery pack housing 102 and the insertion portion 3432 generally located below the battery pack housing 102. The restraining portion 302 and the lug 303 abut against the upper and lower surfaces of the battery pack housing 102, respectively. When the sealing ring 3506 is attached to the lower surface of the restraining portion 302 by interference fit, and the sealing ring 506 abuts against the upper surface of the battery pack housing 102, the top plate 105 of the battery pack housing 102 is prevented from loosening between the restraining portion 302 and the lug 303 of the pressure relief device 101, and the fastening effect of the restraining portion 302 and the lug 303 to the top plate 105 of the battery pack housing 102 is promoted. In addition, the arrangement of the sealing ring 3506 also helps to seal the pressure relief device 101 from the battery pack housing 102, effectively preventing external dust particles or liquid from entering the battery pack 100 through the gap between the pressure relief device 101 and the battery pack housing 102.

[0044] In the present application, the restraining portion 302 is disposed at the upper end of the insertion portion 3432 of the mounting base 3505 of the pressure relief device 101, the lug 303 is disposed at the insertion portion 3432, and the notch 5313 capable of receiving the lug 303 is disposed in the wall of the mounting hole 230 in the battery pack housing 102, and due to the matching relationship between the restraining portion 302, the lug 303, and the mounting hole 230, the pressure relief device 101 is fixedly attached to the battery pack 100 by the restraining portion 302 and the lug 303 by only two steps, that is, a step of inserting the insertion portion 3432 into the mounting hole 230 and a step of rotating the insertion portion 3432, without requiring additional mounting parts and mounting tools, thereby greatly simplifying the assembly steps of the pressure relief device 101. In this embodiment, the lug 303 of the pressure relief device 101 includes two lugs 303, but in other embodiments, other numbers of lugs 303, such as one, three, four, etc., can be used. Additionally, a corresponding number of snap-receiving portions 313 must be provided in the mounting holes 300 in the battery pack housing 102 to accommodate the placement of that number of lugs 303. [Industrial Applicability]

[0045] The pressure relief device 101 of the present application is used in a battery pack 100. In other embodiments, the pressure relief device 101 can be provided in other components that require pressure relief. In this embodiment, the battery pack 100 employing the pressure relief device 101 is installed in an electric vehicle, such as an electric car, a hybrid vehicle, etc. In other embodiments, the pressure relief device 101 can also be used in battery packs 100 in other technical fields. Some aspects of the invention are described below. [Aspect 1] In the mounting base of the pressure relief device, a body portion (301) having an insertion portion (3432); a stop portion (302) disposed at an upper end of the insertion portion (3432) and extending outwardly from the body portion (301); A mounting base (3505) comprising at least one lug (303) disposed in the insertion portion (3432) and protruding outwardly from the insertion portion (3432), the at least one lug (303) being positioned below the restraining portion (302), such that a clamping space (3900) is formed between the at least one lug and the restraining portion (302). [Aspect 2] A mounting base (3505) for a pressure relief device as described in embodiment 1, wherein the insert portion (3432) is in the form of a cylindrical sleeve and the at least one lug (303) projects outwardly from the outer circumferential surface of the insert portion (3432). [Aspect 3] The mounting base (3505) of the pressure relief device described in embodiment 2, wherein the at least one lug (303) includes a pair of lugs (303), the pair of lugs (303) being symmetrically positioned relative to the axis of the insertion portion (3432). [Aspect 4] The at least one lug (303) is An elastic arm (3701), wherein a proximal end (3711) of the elastic arm (3701) is connected to the insertion portion (3432) and a distal end of the elastic arm (3701) is a free end (3712); a housing portion (3702) connected to the insertion portion (3432) is provided with a housing space (3703), and the housing space (3703) includes a housing portion (3702) that at least partially houses the elastic arm (3701); A mounting base (3505) for a pressure relief device as described in embodiment 1, wherein when the elastic arm (3701) is in a free state, the elastic arm (3701) is at least partially positioned above an upper surface of the storage portion (3702). [Aspect 5] A mounting base (3505) for a pressure relief device according to embodiment 4, wherein the free end (3712) is provided with a protrusion (3704) that protrudes toward the restraining portion (302). [Aspect 6] the insertion portion (3432) is configured to be insertable into a mounting hole (230) of a component, the mounting hole (230) having at least one notch (5313) in a wall thereof for receiving the at least one lug (303); the restraining portion (302) is configured to be positioned outside the mounting hole (230) when the insertion portion (3432) is inserted into the mounting hole (230); the at least one lug (303) is configured to be insertable into the mounting hole (230) by aligning with the at least one notch (5313); A mounting base (3505) for a pressure relief device as described in embodiment 4, wherein the insertion portion (3432) is inserted into the mounting hole (230) and rotated so that the at least one lug (303) and the at least one notch (5313) are staggered, and then a portion of the component around the mounting hole (230) is clamped in the clamping space (3900). [Aspect 7] A mounting base (3505) of a pressure relief device as described in embodiment 6, wherein at least one slot (5314) is provided in the wall of the mounting hole (203), the at least one slot (5314) and the at least one notch (5313) are staggered, and the at least one slot (5314) is configured to be capable of receiving the elastic arm (3701) of the at least one lug (303). [Aspect 8] 2. The mounting base (3505) of the pressure relief device of embodiment 1, further comprising a sealing ring (3506) secured to an underside of the restraining portion (302). [Aspect 9] The body portion (301) further has a head (3431) connected to an upper end of the insert portion (3432) at a connection end (3435) of the head, the head (3431) and the insert portion (3432) together forming a fluid passage (3401); The mounting base (3505) of the pressure relief device described in embodiment 1, wherein the restraining portion (302) surrounds the connection end (3435) of the head (3431) and protrudes outwardly from the head (3431). [Aspect 10] 10. The mounting base (3505) of a pressure relief device according to embodiment 9, wherein the head (3431) is in the form of a cylindrical sleeve and the restraining portion (302) is an annular flange. [Explanation of symbols]

[0046] 100 Battery Packs 101 Pressure relief device 102 Battery pack housing 105 Tabletop 203 holes 230 holes 300 holes 301 Main body part 302 Stopping part 303 Rug 313 parts 330 Top cover 331 Cover Wall 333 Slots 334 Upper end 335 Lower end 336 Snap Hole 337 Central Support Post 338 Support plate 339 Sub-passage 340 Valve core body 341 Materials 342 Valve core outer rim 343 Valve Core Spokes 344 Valve core center post 350 Snap parts 380 Notch 457 Outer contact element 501 Protective cover 504 Valve Core 505 Mounting Base 506 Seal Ring 701 Elastic Arm 3401 Fluid passage 3402 Pressure relief passage 3403 Aperture 3420 Recess 3422 Extension 3424 Arm 3431 Head 3432 Insertion 3435 Connection end 3438 Upper end 3451 Top surface 3452 Bottom side 3455 Seal ring groove 3456 Platform 3457 Outer abutment element 3458 Connection Bar 3459 Support Platform 3460 Rib 3501 Protective cover 3502 Pressure release member 3503 Waterproof and gas-permeable thin film 3504 Valve Core 3505 Mounting base 3506 Seal ring 3510 Part Through Hole 3511 Protective cover through hole 3512 Support Structure 3514 Valve core through hole 3551 Inner edge 3553 Outer edge 3701 Elastic Arm 3702 Storage area 3703 Containment Space 3704 Protrusion 3711 Proximal end 3712 Distal end 3900 Clamp space 5313 Notch 5314 Slots

Claims

1. In the mounting base of the pressure relief device, a body portion (301) having an insert portion (3432); a restraining portion (302) disposed at an upper end of the insert portion (3432) and extending outwardly from the body portion (301); At least one lug (303) having a resilient arm (3701) and a receiving portion (3702) with an upper surface facing the restraining portion (302); the receiving portion (3702) is connected to the insert portion (3432) and forms a receiving space (3703) for at least partially receiving the elastic arm (3701); the at least one lug (303) is provided on the insert portion (3432) and protrudes outward from the insert portion (3432); the at least one lug (303) is located under the restraining portion (302); and a clamping space (3900) is formed between the at least one lug and the restraining portion (302); When the elastic arm (3701) is in a free state, the elastic arm (3701) is a mounting base (3505) that is at least partially located above the upper surface of the storage portion (3702).

2. The mounting base (3505) of a pressure relief device as described in claim 1, wherein the insert portion (3432) is in the form of a cylindrical sleeve and the at least one lug (303) projects outwardly from the outer circumferential surface of the insert portion (3432).

3. The mounting base (3505) of a pressure relief device as described in claim 2, wherein the at least one lug (303) includes a pair of lugs (303), the pair of lugs (303) being symmetrically arranged with respect to the axis of the insertion portion (3432).

4. The mounting base (3505) of a pressure relief device as described in claim 1, wherein the elastic arm (3701) has a proximal end (3711) connected to the insertion portion (3432) and a distal end which is a free end (3712).

5. The mounting base (3505) of claim 4, wherein said free end (3712) is provided with a protrusion (3704) that protrudes toward said restraining portion (302).

6. the insertion portion (3432) is configured to be insertable into a mounting hole (230) of a component, the mounting hole (230) having at least one notch (5313) in a wall thereof for receiving the at least one lug (303); the restraining portion (302) is configured to be positioned outside the mounting hole (230) when the insertion portion (3432) is inserted into the mounting hole (230); the at least one lug (303) is configured to be insertable into the mounting hole (230) by aligning with the at least one notch (5313); The mounting base (3505) of a pressure relief device as described in claim 4, wherein after the insertion portion (3432) is inserted into the mounting hole (230) and rotated so that the at least one lug (303) and the at least one notch (5313) are staggered, a portion of the component around the mounting hole (230) is clamped in the clamping space (3900).

7. The mounting base (3505) of a pressure relief device as described in claim 6, wherein at least one slot (5314) is provided in the wall of the mounting hole (203), the at least one slot (5314) and the at least one notch (5313) are staggered, and the at least one slot (5314) is configured to be capable of receiving the elastic arm (3701) of the at least one lug (303).

8. 2. The mounting base (3505) of claim 1, further comprising a seal ring (3506) secured to an underside of said restraining portion (302).

9. The body portion (301) further comprises a head portion (3431) connected to an upper end of the insert portion (3432) at a connection end (3435) of the head portion, the head portion (3431) and the insert portion (3432) together forming a fluid passage (3401); The mounting base (3505) of a pressure relief device as described in claim 1, wherein the restraining portion (302) surrounds the connection end (3435) of the head (3431) and protrudes outwardly from the head (3431).

10. 10. The mounting base (3505) of claim 9, wherein said head (3431) is in the form of a cylindrical sleeve and said restraining portion (302) is an annular flange.

11. The mounting base (3505) of claim 1, wherein the restraining portion (302) has an outer edge and a lower surface facing the accommodating portion (3702), and at least one external abutment element (3457) protrudes from the restraining portion (302) toward the accommodating portion (3702).

12. The mounting base (3505) of claim 11, wherein the at least one outer abutment element (3457) comprises a plurality of outer abutment elements (3457).

13. A mounting base (3505) according to claim 12, wherein two of said including outer abutment elements (3457) are connected to adjacent outer edges to form a connecting bar (3457).

Images