Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a box body with an accommodating cavity, and an explosion-proof valve comprising a valve body, a clamping piece and a sealing piece, the box body comprises a side wall, a through hole communicated with the containing cavity is formed in the side wall, the side wall is provided with a limiting face and a sealing face which are oppositely arranged, the clamping piece is connected to one side of the valve body, the clamping piece is arranged in the through hole in a penetrating mode and abuts against the limiting face, and the sealing piece is arranged in the circumferential direction of the valve body and abuts between the sealing face and the valve body. According to the battery pack provided by the invention, when the battery pack is subjected to thermal runaway, the clamping piece is broken under the impact of high-temperature and high-pressure gas generated by the battery pack, and the anti-explosion valve is separated from the box body after losing the fixation of the clamping piece, so that the through hole is released for pressure relief until the internal and external pressures of the box body are equal, thereby reducing the possibility of heat residue and improving the safety of the battery pack. And a better pressure relief effect is achieved, so that the safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] In existing battery packs, the battery pack is housed within the enclosure of the casing. An explosion-proof valve is connected to a through-hole in the casing via a spring. When thermal runaway occurs in the battery pack, the high-temperature, high-pressure gas released from the battery pack forces the explosion-proof valve to overcome the spring's elastic force, thus opening the through-hole to release pressure. However, when the pressure inside the casing drops to a certain value, the explosion-proof valve resets under the spring's action, closing the through-hole. This leaves residual heat inside the casing, resulting in poor pressure relief and compromising the safety of the battery pack. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery pack and an electrical device, which aims to solve the technical problem of poor pressure relief effect of the battery pack in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0007] The box has a receiving cavity, the box includes a side wall, the side wall has a through hole communicating with the receiving cavity, and the side wall has a limiting surface and a sealing surface that are disposed opposite to each other;

[0008] An explosion-proof valve includes a valve body, a snap-fit ​​component, and a seal. The snap-fit ​​component is connected to one side of the valve body, passes through the through hole, and abuts against the limiting surface. The seal is arranged circumferentially along the valve body and abuts against the sealing surface and the valve body.

[0009] In one embodiment of the first aspect, the snap-fit ​​member includes a plurality of snaps, the plurality of snaps being spaced apart circumferentially along the valve body, each snap being disposed through the through hole and abutting against the limiting surface.

[0010] In one embodiment of the first aspect, each of the latches has a notch at one end near the valve body, and the notch communicates with the through hole.

[0011] In one embodiment of the first aspect, each of the buckles has a first side and a second side disposed opposite to each other, and the notch is provided on the first side and the second side respectively, and each notch communicates with the through hole.

[0012] In one embodiment of the first aspect, each of the latches includes a first engaging portion and a second engaging portion, the first engaging portion being connected between the valve body and the second engaging portion, the first engaging portion and the second engaging portion forming a stepped structure, the first engaging portion abutting against the wall of the through hole, and the second engaging portion abutting against the limiting surface.

[0013] In one embodiment of the first aspect, each of the latches is provided with a guide ramp at the end away from the valve body.

[0014] In one embodiment of the first aspect, the valve body has a first groove on the side facing the snap-fit ​​member, the first groove is arranged circumferentially along the valve body, a portion of the seal is disposed in the first groove, and the portion of the seal facing away from the first groove abuts against the sealing surface.

[0015] In one embodiment of the first aspect, the explosion-proof valve further includes a waterproof and breathable layer, and the valve body has a vent hole that penetrates the valve body along the axial direction of the through hole and communicates with the through hole. The waterproof and breathable layer covers the end of the vent hole away from the housing.

[0016] In one embodiment of the first aspect, the valve body has a second groove communicating with the vent hole on the side opposite to the snap-fit ​​member, the waterproof and breathable layer is disposed in the second groove, and the thickness of the waterproof and breathable layer is less than the depth of the second groove.

[0017] Secondly, embodiments of this application provide an electrical device including the battery pack described in any of the above embodiments.

[0018] The beneficial effects of this application are as follows:

[0019] In the battery pack provided in this application, a through hole communicating with the receiving cavity is provided on the side wall of the casing. The side wall of the casing has a limiting surface and a sealing surface. The explosion-proof valve includes a valve body, a snap-fit ​​component, and a sealing component. The snap-fit ​​component is connected to one side of the valve body, passes through the through hole, and abuts against the limiting surface to snap the explosion-proof valve onto the side wall of the casing. At the same time, the sealing component is arranged circumferentially along the valve body and abuts between the sealing surface and the valve body to seal the through hole. In this way, when the battery pack experiences thermal runaway, the snap-fit ​​component breaks under the impact of the high-temperature and high-pressure gas generated by the battery pack. After losing the fixation of the snap-fit ​​component, the explosion-proof valve detaches from the casing and releases pressure through the through hole until the pressure inside and outside the casing is equal. This reduces the possibility of residual heat and has a better pressure relief effect, thereby improving the safety of the battery pack.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This paper shows a schematic diagram of the battery pack structure from one perspective in one embodiment of the present application;

[0023] Figure 2 It shows Figure 1 A three-dimensional cross-sectional view of the battery pack at point AA after omitting the battery assembly.

[0024] Figure 3 It shows Figure 1 A schematic diagram of the cross-sectional structure of the battery pack at point AA after omitting the battery group;

[0025] Figure 4 An exploded perspective view of a battery pack according to one embodiment of this application is shown;

[0026] Figure 5 This paper shows another exploded perspective view of the battery pack in one embodiment of the present application;

[0027] Figure 6 A three-dimensional structural schematic diagram of an explosion-proof valve in one embodiment of this application is shown;

[0028] Figure 7 It shows Figure 6 A magnified structural diagram of region B in the middle;

[0029] Figure 8 A schematic diagram of the explosion-proof valve from one perspective is shown in one embodiment of this application.

[0030] Explanation of key component symbols:

[0031] 1000-Battery pack; 200-Box body; 201-Side wall; 210-Receiving cavity; 220-Through hole; 230-Limiting surface; 240-Sealing surface; 300-Explosion-proof valve; 310-Valve body; 311-First groove; 312-Ventilation hole; 313-Second groove; 320-Snap-fit ​​component; 321-Snap buckle; 3211-First engaging part; 32111-Notch; 32112-First side; 32113-Second side; 3212-Second engaging part; 32121-Guide slope; 330-Sealing component; 340-Waterproof and breathable layer; X-Circumferential direction. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In existing battery packs, the battery pack is housed within the enclosure of the casing. An explosion-proof valve is connected to a through-hole in the casing via a spring. When thermal runaway occurs, the high-temperature, high-pressure gas released from the battery pack forces the explosion-proof valve to overcome the spring's elastic force, opening the through-hole to release pressure. However, when the pressure inside the casing drops to a certain value, the explosion-proof valve resets under the spring's action, closing the through-hole. This leaves residual heat inside the casing, resulting in poor pressure relief and compromising the battery pack's safety. Furthermore, existing battery packs suffer from low assembly efficiency due to the inconvenience of installing the explosion-proof valve.

[0038] like Figure 1 , Figure 2 and Figure 8 As shown, an embodiment of this application provides a battery pack 1000, including a housing 200 and an explosion-proof valve 300.

[0039] The housing 200 has a receiving cavity 210 and includes a side wall 201. The side wall 201 has a through hole 220 communicating with the receiving cavity 210, and the side wall 201 has a limiting surface 230 and a sealing surface 240 that are disposed opposite to each other. The explosion-proof valve 300 includes a valve body 310, a snap-fit ​​member 320, and a sealing member 330. The snap-fit ​​member 320 is connected to one side of the valve body 310, passes through the through hole 220, and abuts against the limiting surface 230. The sealing member 330 is disposed along the circumferential direction X of the valve body 310 and abuts between the sealing surface 240 and the valve body 310.

[0040] It should be noted that the housing 200 houses the battery pack through the receiving cavity 210. The battery pack may include one or more battery cells, such as prismatic batteries, cylindrical batteries, pouch batteries, button batteries, etc. When the battery pack includes multiple battery cells, the different battery cells can be electrically connected in series or in parallel. No specific restrictions are placed on the structure of the battery pack here.

[0041] Furthermore, the aforementioned "seal 330 is arranged in a ring around the valve body 310" can be understood as the seal 330 being arranged in a ring around the valve body 310, that is, the seal 330 is arranged around the valve body 310 in a complete circle. Of course, the seal 330 can also be arranged in a non-ring around the valve body 310. There are no specific restrictions on the arrangement of the seal 330, as long as it can cooperate with the explosion-proof valve 300 to seal the through hole 220.

[0042] For example, the seal 330 can be integrally molded from a material with elastic sealing capabilities, such as silicone, rubber, or sponge. No specific limitation is made on the type of seal 330. For example, the snap-fit ​​member 320 can be connected to the valve body 310 in an integral molding, welding, threaded connection, adhesive connection, quick-release connection, etc. No specific limitation is made on the method of connection between the snap-fit ​​member 320 and the valve body 310.

[0043] It is understood that in the battery pack 1000 provided in this embodiment, the side wall 201 of the housing 200 is provided with a through hole 220 communicating with the receiving cavity 210, and the side wall 201 of the housing 200 has a limiting surface 230 and a sealing surface 240. The explosion-proof valve 300 includes a valve body 310, a snap-fit ​​member 320 and a sealing member 330. The snap-fit ​​member 320 is connected to one side of the valve body 310. The snap-fit ​​member 320 passes through the through hole 220 and abuts against the limiting surface 230 to snap the explosion-proof valve 300 onto the side wall 201 of the housing 200. At the same time, the sealing member 330 is arranged along the circumferential direction X of the valve body 310 and abuts between the sealing surface 240 and the valve body 310 to seal the through hole 220. In this way, when the battery pack experiences thermal runaway, the latch 320 breaks under the impact of the high-temperature and high-pressure gas generated by the battery pack. After losing the fixation of the latch 320, the explosion-proof valve 300 detaches from the housing 200 and releases pressure through the through hole 220 until the pressure inside and outside the housing 200 is equal. This reduces the possibility of residual heat and has a better pressure relief effect, thereby improving the safety of the battery pack 1000.

[0044] In addition, the explosion-proof valve 300 is snapped into the side wall 201 of the housing 200 by the snap-fit ​​part 320, which makes the installation of the explosion-proof valve 300 more convenient and quick, shortens the installation time and installation difficulty of the explosion-proof valve 300, and thus improves the assembly efficiency of the battery pack 1000.

[0045] It should be noted that when both the limiting surface 230 and the sealing surface 240 are planes, they are parallel to each other and both are perpendicular to the axial direction of the through hole 220 (i.e., the axial direction of the through hole 220).

[0046] like Figures 1 to 3 As shown, in one embodiment, the snap-fit ​​member 320 includes a plurality of snaps 321, which are spaced apart along the circumferential direction X of the valve body 310. Each snap 321 passes through the through hole 220 and abuts against the limiting surface 230.

[0047] For example, the number of clips 321 can be two, three, four, five, etc., without any specific limitation.

[0048] Understandably, when thermal runaway occurs in the battery pack, the impact of the high-temperature, high-pressure gas generated by the battery pack causes each latch 321 of the explosion-proof valve 300 to break. After losing the hold of the latches 321, the explosion-proof valve 300 detaches from the housing 200, releasing pressure through the through-hole 220 until the pressure inside and outside the housing 200 is equalized, thereby reducing the possibility of residual heat. Simultaneously, because multiple latches 321 are spaced X-shaped along the circumference of the valve body 310, the explosion-proof valve 300 experiences more balanced forces, allowing for more timely pressure release through the through-hole 220.

[0049] like Figure 6 and Figure 7 As shown, each latch 321 has a notch 32111 at one end near the valve body 310, and the notch 32111 communicates with the through hole 220.

[0050] It is understandable that by providing a notch 32111 at one end of each latch 321 near the valve body 310, the structural strength of the latch 321 can be weakened in a directional manner, making the latch 321 more likely to break when the explosion-proof valve 300 is subjected to the impact of high temperature and high pressure gas, so as to allow for timely large-scale exhaust.

[0051] like Figure 6 and Figure 7 As shown, each buckle 321 further has a first side 32112 and a second side 32113 arranged opposite to each other. Notches 32111 are respectively provided on the first side 32112 and the second side 32113. Each notch 32111 is connected to the through hole 220. This can further weaken the structural strength of the buckle 321 in a directional manner to meet the fracture requirements during thermal runaway.

[0052] like Figure 3 , Figure 6 and Figure 7 As shown, each latch 321 further includes a first engaging portion 3211 and a second engaging portion 3212. The first engaging portion 3211 is connected between the valve body 310 and the second engaging portion 3212. The first engaging portion 3211 and the second engaging portion 3212 form a stepped structure. The first engaging portion 3211 abuts against the wall of the through hole 220, and the second engaging portion 3212 abuts against the limiting surface 230.

[0053] For example, the first engaging portion 3211 can be connected between the valve body 310 and the second engaging portion 3212 in a manner that includes integral molding, welding, threaded connection, adhesive connection, quick-release connection, etc., without any specific limitations.

[0054] It is understandable that the first engaging part 3211 and the second engaging part 3212 form a stepped structure, with the first engaging part 3211 abutting against the wall of the through hole 220 and the second engaging part 3212 abutting against the limiting surface 230. This can increase the stability of the explosion-proof valve 300 when it is engaged at the through hole 220, thereby reducing the possibility of the explosion-proof valve 300 detaching from the housing 200 when the battery pack does not experience thermal runaway.

[0055] like Figure 6 and Figure 7 As shown, each latch 321 is further provided with a guide ramp 32121 at the end away from the valve body 310.

[0056] For example, the guide slope 32121 can be a plane and / or an arc surface, that is, the guide slope 32121 is one of a plane and an arc surface, or a combination of a plane and an arc surface. No specific limitation is made on the shape of the guide slope 32121 here.

[0057] Understandably, since each clip 321 has a guide slope 32121 at the end away from the valve body 310, the guide slope 32121 can guide the clip 321 to slide into the through hole 220 when installing the explosion-proof valve 300, thereby improving the assembly efficiency of the battery pack 1000.

[0058] Of course, for the above embodiments, the snap-fit ​​component 320 may also include a buckle 321, that is, the snap-fit ​​component 320 adopts a single buckle 321 design, which can also realize the snap-fit ​​between the explosion-proof valve 300 and the housing 200. Here, no specific restrictions are made on the structure of the snap-fit ​​component 320.

[0059] like Figures 1 to 3As shown, in one embodiment, a first groove 311 is provided on the side of the valve body 310 facing the snap-fit ​​member 320. The first groove 311 is provided along the circumferential direction X of the valve body 310. A portion of the seal member 330 is provided in the first groove 311, and the portion of the seal member 330 facing away from the first groove 311 abuts against the sealing surface 240.

[0060] Understandably, since a portion of the seal 330 is disposed within the first groove 311, this restricts the movement of the seal 330 relative to the valve body 310, increases the stability of the seal 330, and thus reduces the risk of seal failure due to displacement of the seal 330.

[0061] like Figures 1 to 3 As shown, in one embodiment, the explosion-proof valve 300 further includes a waterproof and breathable layer 340. A vent 312 is provided on the valve body 310. The vent 312 passes through the valve body 310 along the axial direction of the through hole 220 and communicates with the through hole 220. The waterproof and breathable layer 340 covers the end of the vent 312 away from the housing 200.

[0062] Understandably, since the waterproof and breathable layer 340 has waterproof and breathable functions, it can effectively block water from entering the housing 200 without affecting the entry and exit of gas. In this way, when there is a difference between the inside of the housing 200 (i.e., the containment cavity 210) and the external environment, such as pressure difference caused by temperature changes, altitude changes, etc., the waterproof and breathable layer 340 can absorb and exhale under the action of pressure difference to balance the pressure difference inside and outside the housing 200, thereby reducing the risk of structural deformation of the housing 200 due to the pressure difference inside and outside.

[0063] like Figures 3 to 5 As shown, further, a second groove 313 communicating with the vent hole 312 is provided on the side of the valve body 310 away from the snap-fit ​​member 320. The waterproof and breathable layer 340 is disposed in the second groove 313. The thickness of the waterproof and breathable layer 340 is less than the depth of the second groove 313. This can effectively protect the waterproof and breathable layer 340 and reduce the risk of damage to the waterproof and breathable layer 340 caused by the external environment.

[0064] It should be noted that "the depth of the second groove 313" can be understood as the opening depth of the second groove 313, that is, the dimension of the second groove 313 along the axial direction of the through hole 220, which is also the vertical distance from the edge of the groove to the bottom of the groove.

[0065] Embodiments of this application also provide an electrical device, including the battery pack 1000 described in any of the above embodiments.

[0066] It should be noted that electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can include gasoline-powered cars, natural gas-powered cars, and new energy vehicles; new energy vehicles can include pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools can include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. No specific restrictions are placed on the type of electrical device. Furthermore, the battery pack 1000 can also be used in energy storage devices such as energy storage containers and energy storage power stations.

[0067] It is understood that since the power supply device provided in this embodiment has the battery pack 1000 described in any of the above embodiments, it has all the beneficial effects of the battery pack 1000, which will not be described in detail here.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery pack, characterized in that, include: The housing (200) has a receiving cavity (210). The housing (200) includes a side wall (201). The side wall (201) has a through hole (220) communicating with the receiving cavity (210). The side wall (201) has a limiting surface (230) and a sealing surface (240) that are disposed opposite to each other. An explosion-proof valve (300) includes a valve body (310), a snap-fit ​​member (320), and a seal (330). The snap-fit ​​member (320) is connected to one side of the valve body (310), passes through the through hole (220), and abuts against the limiting surface (230). The seal (330) is disposed along the circumferential direction (X) of the valve body (310) and abuts between the sealing surface (240) and the valve body (310).

2. The battery pack according to claim 1, characterized in that, The snap-fit ​​component (320) includes a plurality of snaps (321), which are spaced apart along the circumferential (X) direction of the valve body (310). Each snap (321) passes through the through hole (220) and abuts against the limiting surface (230).

3. The battery pack according to claim 2, characterized in that, Each of the latches (321) has a notch (32111) at one end near the valve body (310), and the notch (32111) communicates with the through hole (220).

4. The battery pack according to claim 3, characterized in that, Each of the buckles (321) has a first side (32112) and a second side (32113) disposed opposite to each other. The first side (32112) and the second side (32113) are respectively provided with notches (32111), and each notch (32111) is connected to the through hole (220).

5. The battery pack according to claim 2, characterized in that, Each of the latches (321) includes a first engaging portion (3211) and a second engaging portion (3212). The first engaging portion (3211) is connected between the valve body (310) and the second engaging portion (3212). The first engaging portion (3211) and the second engaging portion (3212) form a stepped structure. The first engaging portion (3211) abuts against the wall of the through hole (220), and the second engaging portion (3212) abuts against the limiting surface (230).

6. The battery pack according to claim 2, characterized in that, Each of the latches (321) has a guide ramp (32121) at one end away from the valve body (310).

7. The battery pack according to any one of claims 1 to 6, characterized in that, The valve body (310) has a first groove (311) on the side facing the snap-fit ​​member (320). The first groove (311) is arranged along the circumferential (X) direction of the valve body (310). A portion of the seal (330) is disposed in the first groove (311), and the portion of the seal (330) facing away from the first groove (311) abuts against the sealing surface (240).

8. The battery pack according to any one of claims 1 to 6, characterized in that, The explosion-proof valve (300) also includes a waterproof and breathable layer (340). A vent hole (312) is provided on the valve body (310). The vent hole (312) passes through the valve body (310) along the axial direction of the through hole (220) and communicates with the through hole (220). The waterproof and breathable layer (340) covers the end of the vent hole (312) away from the housing (200).

9. The battery pack according to claim 8, characterized in that, The valve body (310) has a second groove (313) on the side opposite to the snap-fit ​​member (320) that communicates with the vent hole (312). The waterproof and breathable layer (340) is disposed in the second groove (313), and the thickness of the waterproof and breathable layer (340) is less than the depth of the second groove (313).

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1 to 9.

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