Battery pack and electric device

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery pack which comprises a frame, a supporting plate, a bottom protection plate, battery monomers and an elastic piece, and the frame is provided with a first opening; the supporting plate covers the first opening, and a closed cavity is defined by the supporting plate and the frame; the bottom protection plate is arranged on the side, away from the closed cavity, of the supporting plate, and a pressure relief space is defined by the bottom protection plate and the supporting plate. The battery monomers are arranged in the closed chamber and are connected with the supporting plate; the elastic piece is arranged in the pressure relief space and connected with the supporting plate and the bottom protection plate. A first pressure relief hole is formed in the supporting plate, a first convex rib is arranged on the supporting plate, the first convex rib protrudes towards the bottom protection plate in the first direction, and the orthographic projection of the first convex rib on the supporting plate and the first pressure relief hole are arranged at an interval. The invention further discloses a power utilization device. By arranging the elastic pieces and the first convex ribs, the anti-impact effect of the bottom of the whole bag can be effectively 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] In new energy vehicles, the battery pack is located under the vehicle. Impacts to the bottom of the vehicle can easily cause the battery pack to catch fire. To prevent battery pack fires from impacts, existing technologies often incorporate protective measures at the bottom of the battery pack, such as adding cushioning foam. However, under vibration, the cushioning foam can be compressed by the individual battery cells, leading to permanent deformation. Furthermore, the cushioning foam cannot recover its deformed state after absorbing energy, thus losing its protective function. An impact to the bottom of the battery pack can result in severe situations such as power loss for the entire pack or thermal runaway of individual battery cells. Summary of the Invention

[0003] The technical problem this application aims to solve is: how to improve the impact resistance of the bottom of the battery pack.

[0004] To address the aforementioned technical problems, this application proposes a battery pack having a first orientation, comprising: The frame has a first opening on one side along the first direction; A support plate covers the first opening, and the support plate and the frame enclose a sealed cavity. A bottom protective plate is provided on the side of the support plate away from the sealed chamber, and the bottom protective plate and the support plate are spaced apart along the first direction to form a pressure relief space; A single battery cell is disposed within the sealed cavity and connected to the support plate; An elastic element is disposed within the pressure relief space and connects the support plate and the bottom protective plate; The support plate is provided with a first pressure relief hole, which is configured to allow thermal runaway ejections from the battery cell to pass through; the support plate is provided with a first rib, which protrudes towards the bottom protective plate along the first direction, and the orthographic projection of the first rib on the support plate along the first direction is spaced apart from the first pressure relief hole.

[0005] In some embodiments, the bottom guard plate is provided with a second rib, which protrudes towards the support plate along the first direction; along the first direction, the orthographic projection of the second rib on the support plate is spaced apart from the first pressure relief hole, and the orthographic projection of the second rib on the support plate is spaced apart from the orthographic projection of the first rib on the support plate.

[0006] In some embodiments, along the first direction, the first rib is spaced apart from the bottom guard plate, and the second rib is spaced apart from the support plate.

[0007] In some embodiments, the battery pack also has a second orientation and a third orientation; Both the first rib and the second rib extend along the second direction; there are multiple first ribs spaced apart along the third direction, and two adjacent first ribs along the third direction are respectively located on opposite sides of the first pressure relief hole along the third direction; Wherein, the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] In some embodiments, along the third direction, the orthographic projection of the first rib onto the second rib at least partially overlaps with the second rib.

[0009] In some embodiments, the first pressure relief holes are multiple and arranged in a matrix on the support plate; There are multiple elastic elements, and each of the multiple elastic elements corresponds one-to-one with the multiple first pressure relief holes; Along the first direction, the orthographic projection of the elastic element on the support plate is spaced apart from the first pressure relief hole.

[0010] In some embodiments, along the first direction, the orthographic projection of at least one of the elastic elements on the support plate at least partially overlaps with the battery cell.

[0011] In some embodiments, along the first direction, the bottom guard plate has a positioning groove on the side facing the support plate, and one end of the elastic member along the first direction is located in the positioning groove.

[0012] In some embodiments, along the first direction, the battery cell is provided with at least one first explosion-proof valve on the side near the support plate, and the orthographic projection of the first explosion-proof valve on the support plate is at least partially located in the first pressure relief hole. The pressure relief space is configured to collect thermal runaway ejecta from the battery cells.

[0013] In some embodiments, the frame is provided with the first opening and the second opening on opposite sides along the first direction; The battery pack also includes: A cover plate, connected to the frame and sealing the second opening, is spaced apart from the support plate along the first direction; The battery cell is provided with a terminal post assembly, which is located on the side of the battery cell closer to the cover plate along the first direction; the frame, the cover plate and the support plate together enclose the sealed chamber.

[0014] This application also proposes an electrical device including the battery pack described above.

[0015] Compared with the prior art, the battery pack and power device proposed in this application have the following advantages: This application incorporates an elastic element within the pressure relief space. Firstly, the elastic element can rebound after being compressed under vibration conditions, maintaining its protective function. Secondly, it can absorb energy when the bottom protective plate is impacted, preventing the impact force from directly acting on the support plate and thus avoiding damage to the battery cells. Furthermore, the first rib on the support plate enhances its structural strength and impact resistance, and restricts the compression stroke of the elastic element in the first direction, preventing damage and ensuring energy absorption, thereby improving the overall impact resistance of the bottom of the pack. Moreover, the first rib's projection onto the support plate is spaced apart from the first pressure relief hole, preventing the rib from obstructing the hole and affecting the passage of thermal runaway ejections from the battery cells, thus ensuring pressure relief efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery pack described in this application.

[0017] Figure 2 This is an exploded view of the battery pack described in this application.

[0018] Figure 3 This is a schematic diagram of the structure of the battery cell described in this application.

[0019] Figure 4 This application Figure 1 A sectional view of section AA in the middle.

[0020] Figure 5 This is a schematic diagram of the support plate described in this application.

[0021] Figure 6 This is a structural schematic diagram of the bottom protective plate described in this application.

[0022] Figure 7 This is an isometric cross-sectional view of the battery pack described in this application.

[0023] Figure 8 This application Figure 7 Enlarged diagram of point B in the middle.

[0024] Figure 9 This is a schematic diagram of another structure of the support plate described in this application.

[0025] Figure 10 This application Figure 9 A schematic diagram of the arrangement of the elastic elements described herein.

[0026] Figure label: 1. Frame; 101. First opening; 102. Sealed chamber; 103. Pressure relief space; 104. Second opening; 105. Flow channel; 106. Exhaust channel; 2. Support plate; 201. First pressure relief hole; 21. First rib; 3. Bottom guard plate; 31. Second rib; 32. Positioning groove; 4. Battery cell; 41. First explosion-proof valve; 42. Terminal assembly; 5. Elastic components; 6. Second explosion-proof valve; 7. Fasteners; 8. Isolation components; 801. Reserved cavity; 9. Cover plate; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0027] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0028] 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," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to 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.

[0029] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "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.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] like Figure 1 As shown, this application proposes a battery pack having a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other.

[0034] In some implementations, such as Figure 2 , Figure 4 , Figure 7 and Figure 8 As shown, the battery pack includes a frame 1, a support plate 2, a bottom protective plate 3, and battery cells 4. The frame 1 has a first opening 101 on one side along the first direction X. The support plate 2 is connected to the frame 1 and seals the first opening 101, forming a sealed chamber 102. The battery cells 4 are located within the sealed chamber 102 and connected to the support plate 2, thus isolating the battery cells 4 from the external environment and ensuring the stability of their operation. The bottom protective plate 3 is located on the side of the support plate 2 away from the sealed chamber 102, and the bottom protective plate 3 and the support plate 2 are spaced apart along the first direction X, forming a pressure relief space 103. Specifically, as shown... Figure 5As shown, the support plate 2 is provided with a first pressure relief hole 201. The first pressure relief hole 201 is configured to allow thermal runaway ejections from the battery cell 4 to pass through. The pressure relief space 103 is configured to collect the thermal runaway ejections from the battery cell 4. The support plate 2 not only provides effective support for the battery cell 4, but also separates the sealed chamber 102 and the pressure relief space 103, effectively preventing the ejections from spreading and affecting other normal battery cells 4.

[0035] In some implementation methods, please refer to Figure 7 and Figure 8 The battery pack also includes an elastic element 5, which is located within the pressure relief space 103 and connects the support plate 2 and the bottom protective plate 3. The elastic element 5 can still rebound after being compressed under vibration conditions, thus maintaining its protective function. Secondly, it can also absorb energy when the bottom protective plate 3 is impacted, preventing the impact force from directly acting on the support plate 2 and thus avoiding damage to the individual battery cells 4. Furthermore, to prevent overload damage to the elastic element 5, therefore, as follows... Figure 5 As shown, the support plate 2 is provided with a first rib 21. Along the first direction X, the first rib 21 protrudes towards the bottom guard plate 3. The first rib 21 on the support plate 2 can enhance the structural strength of the support plate 2 itself and improve its impact resistance. The first rib 21 can also limit the compression stroke of the elastic element 5 in the first direction X, preventing the elastic element 5 from being damaged and unable to play its energy absorption role, thereby improving the impact resistance of the bottom of the entire package.

[0036] In some embodiments, the bottom protective plate 3 is detachably connected to the frame 1, specifically, as shown in the example below. Figure 2 As shown, the bottom guard plate 3 is connected to the fastener 7, which is preferably a bolt, so that the bottom guard plate 3 can be replaced separately when it is damaged by impact, thus reducing maintenance costs.

[0037] In some embodiments, to prevent the first rib 21 from blocking the first pressure relief hole 201 and affecting the passage of thermal runaway ejected material from the battery cell 4 through the first pressure relief hole 201, the first rib 21 is spaced apart from the first pressure relief hole 201 along the first direction X on the support plate 2, thereby avoiding interference from the first rib 21 to the ejected material.

[0038] In some implementations, such as Figure 6 As shown, in order to further improve the structural strength of the bottom guard plate 3, the bottom guard plate 3 is provided with a second rib 31, which protrudes towards the support plate 2 along the first direction X. By providing the second rib 31 on the bottom guard plate 3, the structural strength of the bottom guard plate 3 can be effectively improved. At the same time, the second rib 31 is located in the pressure relief space 103 and can cooperate with the first rib 21 to limit the compression stroke of the elastic element 5, so as to prevent the elastic element 5 from being overloaded and damaged and losing its protective function.

[0039] In some embodiments, to prevent the second rib 31 from blocking the first pressure relief hole 201 and affecting the entry of thermal runaway ejected material from the battery cell 4 into the pressure relief space 103, the orthogonal projection of the second rib 31 on the support plate 2 along the first direction X is spaced apart from the first pressure relief hole 201, thereby avoiding interference from the second rib 31 to the ejected material.

[0040] In addition, to avoid interference between the first rib 21 and the second rib 31, the orthographic projection of the second rib 31 on the support plate 2 is set at an interval from the orthographic projection of the first rib 21 on the support plate 2. That is, the first rib 21 and the second rib 31 are staggered to ensure the minimum compression stroke of the elastic member 5.

[0041] In some embodiments, after the first rib 21 and the second rib 31 are misaligned, along the third direction Z, the orthographic projection of the first rib 21 on the second rib 31 at least partially overlaps with the second rib 31. This ensures that when the bottom guard plate 3 is subjected to an impact force in the third direction Z, the first rib 21 can abut against the second rib 31, thereby improving the impact resistance of the bottom guard plate 3.

[0042] In some embodiments, the first rib 21 and the second rib 31 both extend along the second direction Y, and there are multiple first ribs 21 and second ribs 31 arranged at intervals along the third direction Z. Two adjacent first ribs 21 along the third direction Z are respectively located on opposite sides of the first pressure relief hole 201 along the third direction Z, and two adjacent second ribs 31 along the third direction Z are respectively located on opposite sides of the first pressure relief hole 201 along the third direction Z. In this way, the pressure relief space 103 is divided into multiple flow channels 105 spaced at intervals along the third direction Z, and the thermal runaway ejection of the battery cell 4 can flow along the set flow channels 105 to achieve pressure relief.

[0043] It should be noted that the first rib 21 can be a continuous structure in the second direction Y, such as... Figure 5 As shown, it can also be a discontinuous structure, such as... Figure 9 and Figure 10 When the first rib 21 and the second rib 31 are discontinuous structures, the ejected material can flow rapidly through the discontinuity along the third direction Z into the adjacent flow channel 105, thereby achieving rapid pressure relief and avoiding damage to the bottom guard plate 3 due to excessive instantaneous pressure in a certain flow channel 105.

[0044] In some embodiments, there are multiple first pressure relief holes 201 arranged in a matrix on the support plate 2; there are multiple elastic elements 5, and all of the multiple elastic elements 5 are disposed in the pressure relief space 103; along the first direction X, each elastic element 5 is connected to the support plate 2 and the bottom protective plate 3, and the multiple elastic elements 5 correspond one-to-one with the multiple first pressure relief holes 201; and along the first direction X, the orthographic projection of the elastic element 5 on the support plate 2 is spaced apart from the first pressure relief holes 201. In a preferred embodiment, the elastic element 5 is a compression spring, so that the elastic element 5 provides buffer protection for the support plate 2, and can also block some of the ejected material, while allowing gas to flow, so as to realize rapid pressure relief when the battery cell 4 thermally runs away.

[0045] In some embodiments, to ensure the support balance and stability of the support plate 2, at least one elastic element 5 is projected onto the support plate 2 along the first direction X, at least partially overlapping with the battery cell 4, to ensure that the elastic element 5 can provide balanced support and buffer protection for each battery cell 4.

[0046] In some embodiments, to avoid the elastic element 5 from deforming unbalanced after being compressed, a positioning groove 32 is provided on the side of the bottom guard plate 3 facing the support plate 2 along the first direction X. One end of the elastic element 5 along the first direction X is located in the positioning groove 32. By setting the positioning groove 32, it is possible to facilitate the rapid positioning and assembly of the elastic element 5, and to ensure that the force of the elastic element 5 is always positively pressed on the support plate 2, thus providing effective support for the support plate 2.

[0047] In some embodiments, along the first direction X, a plurality of first explosion-proof valves 41 are provided on the side of the battery cell 4 near the support plate 2, specifically, as shown in... Figure 3 As shown, each battery cell 4 has three first explosion-proof valves 41; along the third direction Z, the three first explosion-proof valves 41 are spaced apart; in some embodiments, along the first direction X, the orthographic projection of each first explosion-proof valve 41 on the support plate 2 is at least partially located at a first pressure relief hole 201, that is, each first explosion-proof valve 41 corresponds to a first pressure relief hole 201, such as... Figure 5 As shown, in the event of thermal runaway of battery cell 4, the ejected material can effectively relieve pressure by breaking through any of the first explosion-proof valves 41.

[0048] In another embodiment, one or two first explosion-proof valves 41 are provided on the side of the battery cell 4 near the support plate 2, and along the first direction X, the orthographic projection of each first explosion-proof valve 41 on the support plate 2 is at least partially located in a first pressure relief hole 201, such as... Figure 9As shown, this design allows the thermal runaway ejected material from the battery cell 4 to pass through the first pressure relief hole 201 and enter the pressure relief space 103 after breaking through any of the first explosion-proof valves 41, thereby improving the safety of the entire pack. The purpose of this design is to reduce the number of first pressure relief holes 201 on the support plate 2 by reducing the number of first explosion-proof valves 41 on the battery cell 4, thus ensuring the structural strength of the support plate 2. At this time, the arrangement of the elastic elements 5 corresponds to the position of the first pressure relief holes 201 and is arranged in a matrix, thereby reducing the number of elastic elements 5. This not only reduces the assembly difficulty but also reduces the weight and cost of the entire pack.

[0049] In some embodiments, there are multiple battery cells 4 spaced apart along the second direction Y; the battery pack also includes a spacer 8 along the second direction Y, the spacer 8 being disposed between two adjacent battery cells 4, and the spacer 8 having a reserved cavity 801 extending or penetrating along the second direction Y, such as... Figure 2 As shown, by setting the isolation component 8, on the one hand, two adjacent battery cells 4 in the second direction Y can be isolated to avoid heat spread; on the other hand, the reserved cavity 801 can provide a space for the large surface of the battery cell 4 to circulate and expand.

[0050] In some implementations, such as Figure 2 As shown, the frame 11 has a first opening 101 and a second opening 104 on opposite sides along the first direction X; the battery pack also includes a cover plate 9, which is spaced apart from the support plate 2 along the first direction X, and the cover plate 9 covers the second opening 104; the frame 11, the cover plate 9 and the support plate 2 together enclose a sealed chamber 102.

[0051] In some implementations, such as Figure 3 and Figure 7 As shown, the battery cell 4 is provided with a terminal assembly 42. Along the first direction X, the terminal assembly 42 is located on the side of the battery cell 4 near the cover plate 9. In this way, the terminal assembly 42 and the first explosion-proof valve 41 are respectively located on opposite sides of the battery cell 4 along the first direction X, which can prevent the ejected material from damaging the terminal assembly 42 and the connected electrical components, thereby improving the safety of the battery pack.

[0052] In some implementations, to further improve the safety of the battery pack, for the following reasons, such as Figure 1 As shown, the battery pack also includes a second explosion-proof valve 6, which is disposed on the frame 11; specifically, the frame 11 is provided with an exhaust channel 106, such as... Figure 5 As shown, the exhaust passage 106 is connected to the pressure relief space 103. The second explosion-proof valve 6 is configured to open when the pressure in the exhaust passage 106 reaches a set threshold, so as to further discharge the high-temperature and high-pressure ejected material outside the battery pack and avoid thermal diffusion of the battery pack.

[0053] As can be seen, the battery pack proposed in this application, by setting an elastic element 5 in the pressure relief space 103, firstly, the elastic element 5 can still rebound after being compressed under vibration conditions, and will not lose its protective function; secondly, it can also play an energy absorption role when the bottom protective plate 3 is impacted, avoiding the impact force from acting directly on the support plate 2, thereby avoiding damage to the battery cells 4; in addition, the support plate 2 is provided with a first protruding rib 21, which can enhance the structural strength of the support plate 2 itself, improve its impact resistance, and the first protruding rib 21 can limit the compression stroke of the elastic element 5 in the first direction X, preventing the elastic element 5 from being damaged and unable to play its energy absorption role, thereby improving the impact resistance of the bottom of the entire pack.

[0054] This application also proposes an electrical device comprising the battery pack described above. The specific structure of the battery pack is as described in the above embodiments. Since this electrical device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the above technical solutions, which will not be elaborated upon here.

[0055] The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, or power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric cars, hybrid electric cars, or range-extended electric cars, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools 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, etc. This application does not impose any special restrictions on the aforementioned electrical devices.

[0056] The above description is merely a preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application. The basic principles, main features, and advantages of this application have been shown and described above. For those skilled in the art, it is obvious that this application is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this application.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack having a first direction (X), characterized in that, include: The frame (1) has a first opening (101) on one side along the first direction (X). The support plate (2) covers the first opening (101) and forms a sealed chamber (102) with the frame (1). The bottom guard plate (3) is located on the side of the support plate (2) away from the sealed chamber (102) along the first direction (X), and the bottom guard plate (3) is spaced apart from the support plate (2) to form a pressure relief space (103). A battery cell (4) is disposed in the sealed chamber (102) and connected to the support plate (2); An elastic element (5) is disposed in the pressure relief space (103) and connected to the support plate (2) and the bottom guard plate (3); The support plate (2) is provided with a first pressure relief hole (201), which is configured to allow thermal runaway ejections from the battery cell (4) to pass through; the support plate (2) is provided with a first rib (21), which protrudes towards the bottom guard plate (3) along the first direction (X), and the orthographic projection of the first rib (21) on the support plate (2) along the first direction (X) is spaced apart from the first pressure relief hole (201).

2. The battery pack according to claim 1, characterized in that, The bottom guard plate (3) is provided with a second rib (31). Along the first direction (X), the second rib (31) protrudes towards the support plate (2). Along the first direction (X), the orthographic projection of the second rib (31) on the support plate (2) is spaced apart from the first pressure relief hole (201), and the orthographic projection of the second rib (31) on the support plate (2) is spaced apart from the orthographic projection of the first rib (21) on the support plate (2).

3. The battery pack according to claim 2, characterized in that, Along the first direction (X), the first rib (21) is spaced apart from the bottom guard plate (3), and the second rib (31) is spaced apart from the support plate (2).

4. The battery pack according to claim 2, characterized in that, The battery pack also has a second direction (Y) and a third direction (Z); Both the first rib (21) and the second rib (31) extend along the second direction (Y); there are multiple first ribs (21) and they are spaced apart along the third direction (Z), and two adjacent first ribs (21) along the third direction (Z) are respectively located on opposite sides of the first pressure relief hole (201) along the third direction (Z); The first direction (X), the second direction (Y), and the third direction (Z) are all perpendicular to each other.

5. The battery pack according to claim 4, characterized in that, Along the third direction (Z), the orthographic projection of the first rib (21) onto the second rib (31) at least partially overlaps with the second rib (31).

6. The battery pack according to claim 1, characterized in that, The first pressure relief hole (201) is multiple and arranged in a matrix on the support plate (2); There are multiple elastic elements (5), and each of the multiple elastic elements (5) corresponds to one of the multiple first pressure relief holes (201); Along the first direction (X), the orthographic projection of the elastic element (5) on the support plate (2) is spaced apart from the first pressure relief hole (201).

7. The battery pack according to claim 6, characterized in that, Along the first direction (X), at least one of the elastic elements (5) has its orthographic projection on the support plate (2) at least partially overlapping with the battery cell (4).

8. The battery pack according to claim 6, characterized in that, Along the first direction (X), the bottom guard plate (3) is provided with a positioning groove (32) on the side facing the support plate (2), and one end of the elastic member (5) along the first direction (X) is located in the positioning groove (32).

9. The battery pack according to claim 4, characterized in that, Along the first direction (X), the battery cell (4) is provided with at least one first explosion-proof valve (41) on the side near the support plate (2), and the orthogonal projection of the first explosion-proof valve (41) on the support plate (2) is at least partially located in the first pressure relief hole (201). The pressure relief space (103) is configured to collect thermal runaway ejecta from the battery cell (4).

10. The battery pack according to claim 1, characterized in that, The frame (1) has a first opening (101) and a second opening (104) on opposite sides along the first direction (X). The battery pack also includes: A cover plate (9) is connected to the frame (1) and seals the second opening (104). Along the first direction (X), the cover plate (9) and the support plate (2) are spaced apart. The battery cell (4) is provided with a terminal assembly (42), and along the first direction (X), the terminal assembly (42) is located on the side of the battery cell (4) close to the cover plate (9); the frame (1), the cover plate (9) and the support plate (2) together enclose the sealed chamber (102).

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-10.

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