Battery pack and electric device

Abstract

The application relates to the technical field of batteries, in particular to a battery pack and a power utilization device. The battery pack comprises a box body, a liquid cooling plate, a battery pack and an exhaust valve. A supporting part is arranged at the bottom of the box body and forms a containing cavity with the box body. One side of the liquid cooling plate is connected with the supporting part, and the liquid cooling plate covers an exhaust recess. The liquid cooling plate is provided with a plurality of exhaust ports penetrating through the liquid cooling plate along a first direction. The battery pack is arranged in the containing cavity. The battery pack is arranged on the side of the liquid cooling plate which is opposite to the supporting part. Each battery cell is provided with an explosion-proof valve on the side facing the liquid cooling plate. The plurality of explosion-proof valves and the plurality of exhaust ports are arranged in one-to-one correspondence. The exhaust valve is provided with a plurality of exhaust valves which are arranged in one-to-one correspondence with the plurality of exhaust ports to control the cutting and communication of each exhaust port and the exhaust recess. According to the battery pack and the power utilization device provided by the application, the influence of the opened valve battery cell on the unopened valve battery cell is reduced, the space utilization rate of the battery pack is improved, and the influence of the temperature in the exhaust recess on the battery pack is reduced by using the liquid cooling plate.

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] During the use of rechargeable batteries such as lithium-ion batteries, some gases (such as hydrogen and oxygen) may be generated. The accumulation of these gases may increase the internal pressure of the battery, and in severe cases, may even cause safety problems, such as explosions or fires. Therefore, modern battery packs are usually equipped with venting channels that can connect to each cell to release high-temperature gases in a timely manner in the event of battery thermal runaway.

[0003] However, the exhaust channel is connected to multiple battery cells one by one. Once one battery cell starts to vent, the high-temperature gas it emits will spread to other battery cells connected to that exhaust channel, causing the temperature of other battery cells to rise and even inducing other battery cells to vent in succession. This not only increases the risk of battery pack explosion and fire, but also increases the maintenance cost of battery pack venting. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and electrical device to solve, to some extent, the technical problem in the prior art where the exhaust channel is connected to multiple battery cells one by one, and once one battery cell vents, the high-temperature gas it emits will spread through the exhaust channel to other battery cells connected to that exhaust channel, thereby causing the temperature of other battery cells to rise, and even inducing other battery cells to vent one after another. This not only increases the risk of battery pack explosion and fire, but also increases the maintenance cost of battery pack venting.

[0005] According to a first aspect of this application, a battery pack is provided, including a housing, a liquid cooling plate, a battery pack, and an exhaust valve, wherein the housing includes a support portion and the housing has a first orientation;

[0006] The support part is located at the bottom of the box and forms a receiving cavity with the box. The support part is provided with an exhaust groove that communicates with the receiving cavity.

[0007] The liquid cooling plate is located in the receiving cavity, one side of the liquid cooling plate is connected to the support part, and the liquid cooling plate covers the exhaust groove. The liquid cooling plate is provided with a plurality of exhaust ports that penetrate the liquid cooling plate along the first direction.

[0008] The battery pack is located inside the receiving cavity and is disposed on the side of the liquid cooling plate opposite to the support. The battery pack includes multiple cells, and each cell is provided with an explosion-proof valve on the side facing the liquid cooling plate. The multiple explosion-proof valves and multiple exhaust ports are provided in a one-to-one correspondence.

[0009] The liquid cooling plate is provided with a plurality of exhaust valves, and the plurality of exhaust valves are configured one-to-one with a plurality of exhaust ports to control the disconnection and connection between each exhaust port and the exhaust groove.

[0010] Preferably, the exhaust valve includes:

[0011] An embedded part is embedded in the exhaust port and fixedly connected to the liquid cooling plate, and the embedded part is provided with a first magnetic element;

[0012] The sealing part is provided with a second magnetic element that can be attracted to the first magnetic element. The sealing part is movably connected to the embedding part so that the sealing part can switch between a sealing state and an open state.

[0013] When the sealing part is in the sealing state, the sealing part blocks the exhaust port, and the first magnetic element and the second magnetic element attract each other;

[0014] The magnetic attraction between the first magnetic component and the second magnetic component is less than or equal to the opening pressure of the explosion-proof valve.

[0015] Preferably, the exhaust valve includes a first end and a second end that are opposite to each other;

[0016] At the first end of the exhaust valve, the insert and the sealing part are hinged together.

[0017] The first magnetic element is disposed on the side of the embedded portion near the second end.

[0018] Preferably, the embedding part is provided with a slot, the sealing part is provided with a pin corresponding to the slot, the first magnetic element is disposed in the slot, and the second magnetic element is fixed in the slot;

[0019] Alternatively, the sealing part is provided with a slot, the embedding part is provided with a pin corresponding to the slot, the first magnetic element is fixed to the pin, and the second magnetic element is provided to the pin.

[0020] Preferably, the embedded part includes a frame and a mesh reinforcement. The frame is arranged around the exhaust port, the mesh reinforcement is disposed inside the frame, and the ends of the mesh reinforcement are fixedly connected to the inner wall of the frame.

[0021] Preferably, the housing further includes a cover and a surrounding wall, the surrounding wall being cylindrical extending along the first direction, and the surrounding wall having a receiving cavity for accommodating the battery pack, the support portion and the cover portion respectively covering the two ends of the surrounding wall in the first direction.

[0022] Preferably, it further includes a vent valve, which is disposed in the enclosure wall. The enclosure wall has an exhaust interlayer that communicates with the exhaust groove, and the vent valve communicates with the exhaust groove via the exhaust interlayer.

[0023] Preferably, it further includes a buffer layer disposed between the support portion and the liquid cooling plate.

[0024] Preferably, the battery pack includes a plurality of cell groups arranged side by side along a second direction, each cell group including a plurality of cells stacked sequentially along a third direction, the second direction intersecting the third direction, and the plane defined by the second direction and the third direction intersecting the first direction;

[0025] The exhaust groove includes a connecting part and multiple air guide parts. The air guide parts extend along the third direction. The multiple air guide parts are respectively connected to the outside of the housing through the connecting part. The air guide parts are arranged one-to-one with the battery cell group.

[0026] For the corresponding cell assembly and the air guide, the dimension of the air guide in the second direction is smaller than the dimension of the cell assembly in the second direction.

[0027] According to a second aspect of this application, an electrical device is provided, comprising a battery pack as described in any of the above-described technical solutions, and thus possesses all the beneficial technical effects of the battery pack, which will not be elaborated further here.

[0028] Compared with the prior art, the beneficial effects of this application are as follows:

[0029] The battery pack provided in this application is equipped with an exhaust valve on each exhaust port, which can control the cut-off and connection between the exhaust port and the exhaust groove. This allows the exhaust valve to independently control the connection between the corresponding cell and the exhaust groove, enabling independent exhaust of each cell. If the explosion-proof valve of one or more cells opens, the exhaust valves of other cells will not open. The high-temperature gas discharged by the cell with the open valve will not flow to other cells, reducing the impact of the cell with the open valve on the cells without the open valve. Furthermore, the use of a liquid cooling plate to isolate the exhaust groove of the battery pack and the support not only improves the space utilization of the battery pack, but also further reduces the impact of the temperature in the exhaust groove on the battery pack by utilizing the cooling capacity of the liquid cooling plate.

[0030] 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

[0031] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application;

[0033] Figure 2 Another exploded structural diagram of the battery pack provided in the embodiments of this application;

[0034] Figure 3 This is an isometric structural diagram of the liquid cooling plate provided in the embodiments of this application;

[0035] Figure 4 for Figure 3 A magnified structural diagram of the provided battery pack at point A;

[0036] Figure 5 This is a cross-sectional structural diagram of the battery pack provided in an embodiment of this application;

[0037] Figure 6 for Figure 5 A magnified structural diagram of the provided battery pack at point B.

[0038] Figure label:

[0039] 1-Box body; 10-Receiving cavity; 11-Support part; 110-Exhaust groove; 111-Air guide part; 112-Connecting part; 12-Cover part; 13-Enclosure; 131-Exhaust interlayer; 2-Liquid cooling plate; 20-Exhaust port; 3-Exhaust valve; 301-First end; 302-Second end; 31-Embedding part; 311-Frame body; 312-Mesh rib; 313-Slot; 32-Sealing part; 321-Sealing plate body; 322-Pin; 331-First magnetic component; 332-Second magnetic component; 4-Battery pack; 40-Battery cell; 41-Explosion-proof valve; 5-Buffer layer; 6-Vent valve; F1-First direction; F2-Second direction; F3-Third direction. Detailed Implementation

[0040] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0041] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0042] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; 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.

[0045] The following reference Figures 1 to 6 This application describes a battery pack and power supply device according to some embodiments.

[0046] See Figures 1 to 6As shown, an embodiment of the first aspect of this application provides a battery pack, which includes a housing 1, a liquid cooling plate 2, a battery pack 4, and an exhaust valve 3. The housing includes a support portion and has a first direction. The support portion 11 is disposed at the bottom of the housing 1 and forms a receiving cavity 10 with the housing 1. The support portion 11 is provided with an exhaust groove 110 communicating with the receiving cavity 10. The liquid cooling plate 2 is located in the receiving cavity 10. One side of the liquid cooling plate 2 is connected to the support portion 11, and the liquid cooling plate 2 covers the exhaust groove 110. The liquid cooling plate 2 is provided with a plurality of exhaust ports 20 penetrating the liquid cooling plate 2 along the first direction F1. The battery pack 4 is located in the receiving cavity 10 and is disposed on the side of the liquid cooling plate 2 opposite to the support portion 11. The battery pack 4 includes a plurality of battery cells 40. Each battery cell 40 is provided with an explosion-proof valve 41 on the side facing the liquid cooling plate 2. The plurality of explosion-proof valves 41 and the plurality of exhaust ports 20 are arranged one-to-one. The liquid cooling plate is equipped with multiple exhaust valves 3, and each exhaust valve 3 is configured in a one-to-one correspondence with multiple exhaust ports 20 to control the disconnection and connection between each exhaust port 20 and the exhaust groove 110.

[0047] According to the battery pack provided by the above technical features, each exhaust port 20 is provided with an exhaust valve 3 that can control the cut-off and connection between the exhaust port 20 and the exhaust groove 110, so that the exhaust valve 3 can independently control the connection between the corresponding cell 40 and the exhaust groove 110, realizing independent exhaust of each cell 40. Once one or more cells 40 open the explosion-proof valve 41, the exhaust valves 3 of other cells 40 are not opened. The high-temperature gas discharged by the opened cell 40 will not flow to other cells 40, reducing the impact of the opened cell 40 on the unopened cell 40. In addition, the use of the liquid cooling plate 2 to isolate the battery pack 4 and the exhaust groove 110 of the support part 11 can not only improve the space utilization of the battery pack, but also further reduce the impact of the temperature in the exhaust groove 110 on the battery pack 4 by utilizing the cooling capacity of the liquid cooling plate 2.

[0048] like Figures 1 to 3 , Figure 5 As shown in the figure, F1 can be an example of the first direction F1 described above. For ease of description, two intersecting directions on the plane intersecting the first direction F1 are defined as a second direction F2 and a third direction F3, respectively. F2 shown in the figure can be an example of the second direction F2, and F3 shown in the figure can be an example of the third direction F3. Preferably, the plane defined by the second direction F2 and the third direction F3 is perpendicular to the first direction F1, and the second direction F2 and the third direction F3 are perpendicular to each other, so as to accommodate the structure of most rectangular battery packs.

[0049] Preferably, such as Figure 4As shown, the exhaust valve 3 may include an embedding part 31 and a blocking part 32. The embedding part 31 is embedded in the exhaust port 20 and fixedly connected to the liquid cooling plate 2. The embedding part 31 may be provided with a first magnetic element 331. The blocking part 32 is provided with a second magnetic element 332 that can be attracted to the first magnetic element 331. The blocking part 32 can be movably connected to the embedding part 31 so that the blocking part 32 can switch between a blocking state and an open state. When the blocking part 32 is in the blocking state, the blocking part 32 blocks the exhaust port 20, and the first magnetic element 331 and the second magnetic element 332 are attracted to each other to ensure the stability of the blocking part 32 when it is in the blocking state.

[0050] Preferably, the magnetic attraction between the first magnetic element 331 and the second magnetic element 332 is less than or equal to the opening pressure of the explosion-proof valve 41, so as to ensure that when the air pressure inside the battery pack is greater than the opening pressure of the explosion-proof valve 41, the sealing part 32 can be smoothly opened by the air pressure, thus ensuring the smooth opening of the explosion-proof valve 41 and ensuring the safety of the battery pack.

[0051] Preferably, such as Figure 4 As shown, the aforementioned sealing part 32 may include a sealing plate 321.

[0052] Preferably, such as Figure 4 As shown, the exhaust valve 3 may include a first end 301 and a second end 302 that are opposite to each other. At the first end 301 of the exhaust valve 3, the embedding part 31 and the sealing plate 321 are hinged together. A first magnetic element 331 is disposed on the side of the embedding part 31 near the second end 302. Correspondingly, a second magnetic element 332 is disposed on the sealing plate 321 at a position opposite to the first magnetic element 331. Thus, by arranging the hinged position and the engaging position of the exhaust valve 3 opposite to each other, not only can the opening area of ​​the exhaust valve 3 be maximized, ensuring smooth exhaust, but the opening angle and opening orientation of the exhaust valve 3 can also be effectively controlled, thereby ensuring precise control of the exhaust direction.

[0053] Preferably, such as Figure 4As shown, the aforementioned embedding part 31 can be provided with a slot 313, and the sealing plate 321 can be fixedly provided with a pin 322 corresponding to the slot 313. The first magnetic element 331 is provided in the slot 313, and the second magnetic element 332 is fixed in the slot 313. In this way, on the one hand, the cooperation between the slot 313 and the pin 322 can effectively ensure the closing accuracy of the sealing part 32 and ensure the sealing performance of the exhaust valve 3 in the sealed state; on the other hand, by setting the first magnetic element 331 and the second magnetic element 332 in the slot 313, not only can the first magnetic element 331 and the second magnetic element 332 be hidden, but the height difference between the slot 313 and the pin 322 can also be used to set the first magnetic element 331 and the second magnetic element 332, so as to avoid the phenomenon of air leakage due to the caulking of the first magnetic element 331 and the second magnetic element 332 when the exhaust valve 3 is in the closed state.

[0054] Optionally, not shown in the figure, the above-mentioned slot can also be provided in the above-mentioned blocking part. Correspondingly, the embedding part can be provided with a pin corresponding to the slot, the first magnetic element is fixed to the pin, and the second magnetic element is provided in the pin.

[0055] Preferably, such as Figure 4 As shown, the above-mentioned embedding part 31 may also include a frame 311 and a mesh rib 312. The frame 311 is arranged around the exhaust port 20, and the mesh rib 312 is arranged inside the frame 311. The ends of the mesh rib 312 are all fixedly connected to the inner wall of the frame 311. In this way, while ensuring the smooth exhaust of the embedding part 31, the stability of the embedding part 31 is also ensured.

[0056] Preferably, the frame 311 and the mesh rib 312 can be integrally injection molded.

[0057] Optionally, the surface of the exhaust valve 3 may be provided with a high-temperature resistant layer to prevent the exhaust valve 3 from being burned by high-temperature gas. It should be noted that the surface of the exhaust valve 3 can be understood as the outer surfaces of both the embedded part 31 and the sealing part 32.

[0058] Alternatively, the aforementioned high-temperature resistant layer may be a mica-covered patch, a high-temperature resistant coating, etc.

[0059] In an embodiment, preferably, such as Figure 5 As shown, the aforementioned housing 1 may further include a cover portion 12 and a surrounding wall 13. The surrounding wall 13 is cylindrical and extends along the first direction F1. A receiving cavity 10 for accommodating the battery pack 4 is provided inside the surrounding wall 13. The support portion 11 and the cover portion 12 are respectively covered at both ends of the surrounding wall 13 in the first direction F1 to ensure the airtightness of the housing 1.

[0060] Preferably, such as Figure 5As shown, the battery pack may also include a vent valve 6, which is disposed in the enclosure wall 13. The enclosure wall 13 is provided with an exhaust interlayer 131 that communicates with the exhaust groove 110. The vent valve 6 communicates with the exhaust groove 110 through the exhaust interlayer 131 to ensure the smooth exhaust of the housing 1 and to ensure the safety of the battery pack.

[0061] Preferably, such as Figure 2 As shown, the battery pack may further include a buffer layer 5, which can be disposed between the support portion 11 and the liquid cooling plate 2. When the battery pack is subjected to force, the buffer layer 5 can play an energy-absorbing and buffering role. Optionally, the buffer layer 5 can be an elastic buffer material such as foam.

[0062] Preferably, such as Figure 1 and Figure 2 As shown, the battery pack 4 may include multiple groups of cells 40 arranged side by side along the second direction F2, and each group of cells 40 includes multiple cells 40 stacked sequentially along the third direction F3.

[0063] Preferably, such as Figure 1 and Figure 5 As shown, the exhaust groove 110 may include a connecting part 112 and multiple air guide parts 111. The air guide parts 111 extend along the third direction F3. The multiple air guide parts 111 are respectively connected to the outside of the housing 1 via the connecting part 112. The air guide parts 111 are arranged one-to-one with the battery cell 40 group. In this way, the gas discharged from each exhaust valve 3 is guided to the exhaust jacket 131 through the connecting part 112 and the air guide parts 111. On the one hand, setting the exhaust groove 110 below the liquid cooling plate 2 can effectively reduce the influence of the high temperature gas in the exhaust groove 110 on the temperature of the battery cell 40. On the other hand, the arrangement of the exhaust groove 110 can make the gas discharged from each battery cell 40 discharged from the battery pack according to the path planned by the exhaust groove 110, effectively ensuring the planning, rationality and smoothness of the battery pack exhaust.

[0064] Preferably, such as Figure 2 As shown, for the corresponding battery cell group 40 and air guide 111, the size of the air guide 111 in the second direction F2 is smaller than the size of the battery cell group 40 in the second direction F2, thus ensuring the stability of the battery cell group 40.

[0065] The second aspect of this application also provides an electrical device including the battery pack described in any of the above embodiments, and thus has all the beneficial technical effects of the battery pack, which will not be repeated here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, It includes a housing (1), a liquid cooling plate (2), a battery pack (4), and an exhaust valve (3). The housing (1) includes a support (11) and the housing has a first direction (F1). The support part (11) is located at the bottom of the box (1) and forms a receiving cavity (10) with the box (1). The support part (11) is provided with an exhaust groove (110) that communicates with the receiving cavity (10). The liquid cooling plate (2) is located in the receiving cavity (10). One side of the liquid cooling plate (2) is connected to the support part (11), and the liquid cooling plate (2) covers the exhaust groove (110). The liquid cooling plate (2) is provided with a plurality of exhaust ports (20) that penetrate the liquid cooling plate (2) along the first direction (F1). The battery pack (4) is located in the receiving cavity (10). The battery pack (4) is disposed on the side of the liquid cooling plate (2) facing away from the support part (11). The battery pack (4) includes multiple cells (40). Each cell (40) is provided with an explosion-proof valve (41) on the side facing the liquid cooling plate (2). Multiple explosion-proof valves (41) and multiple exhaust ports (20) are provided in a one-to-one correspondence. The liquid cooling plate is provided with a plurality of exhaust valves (3), and the plurality of exhaust valves (3) are provided in a one-to-one correspondence with the plurality of exhaust ports (20) to control the disconnection and connection between each exhaust port (20) and the exhaust groove (110).

2. The battery pack according to claim 1, characterized in that, The exhaust valve (3) includes: The embedded part (31) is embedded in the exhaust port (20) and fixedly connected to the liquid cooling plate (2). The embedded part (31) is provided with a first magnetic element (331). The sealing part (32) is provided with a second magnetic element (332) that can be attracted to the first magnetic element (331). The sealing part (32) is movably connected to the embedding part (31) so that the sealing part (32) can switch between a sealing state and an open state. When the sealing part (32) is in a sealing state, the sealing part (32) seals the exhaust port (20), and the first magnetic element (331) and the second magnetic element (332) attract each other; The magnetic attraction between the first magnetic element (331) and the second magnetic element (332) is less than or equal to the opening pressure of the explosion-proof valve (41).

3. The battery pack according to claim 2, characterized in that, The exhaust valve (3) includes a first end (301) and a second end (302) that are opposite to each other. At the first end (301) of the exhaust valve (3), the insert (31) and the plug (32) are hinged together; The first magnetic element (331) is disposed on the side of the embedded part (31) near the second end (302).

4. The battery pack according to claim 2, characterized in that, The embedding part (31) is provided with a slot (313), the sealing part (32) is provided with a pin (322) corresponding to the slot (313), the first magnetic element (331) is provided in the slot (313), and the second magnetic element (332) is fixed in the slot (313). Alternatively, the sealing part (32) is provided with a slot (313), the embedding part (31) is provided with a pin (322) corresponding to the slot (313), the first magnetic element (331) is fixed to the pin (322), and the second magnetic element (332) is provided on the pin (322).

5. The battery pack according to claim 2, characterized in that, The embedded part (31) includes a frame (311) and a mesh rib (312). The frame (311) is arranged around the exhaust port (20) for a period of time. The mesh rib (312) is arranged inside the frame (311), and the ends of the mesh rib (312) are fixedly connected to the inner wall of the frame (311).

6. The battery pack according to any one of claims 1 to 5, characterized in that, The housing also includes a cover (12) and a wall (13). The wall (13) is cylindrical and extends along the first direction (F1). The wall (13) has a cavity (10) for accommodating the battery pack (4). The support (11) and the cover (12) are respectively covered at both ends of the wall (13) in the first direction (F1).

7. The battery pack according to claim 6, characterized in that, It also includes a vent valve (6), which is disposed in the enclosure wall (13). The enclosure wall (13) is provided with an exhaust jacket (131) that communicates with the exhaust groove (110). The vent valve (6) communicates with the exhaust groove (110) through the exhaust jacket (131).

8. The battery pack according to claim 1, characterized in that, It also includes a buffer layer (5), which is disposed between the support (11) and the liquid cooling plate (2).

9. The battery pack according to claim 1, characterized in that, The battery pack (4) includes a plurality of cell groups arranged side by side along a second direction (F2), each cell group including a plurality of cells (40) stacked sequentially along a third direction (F3), the second direction (F2) intersects the third direction (F3), and the plane defined by the second direction (F2) and the third direction (F3) intersects the first direction (F1); The exhaust groove (110) includes a connecting part (112) and a plurality of air guide parts (111). The air guide parts (111) extend along the third direction (F3). The plurality of air guide parts (111) are respectively connected to the outside of the housing via the connecting part (112). The air guide parts (111) are arranged one-to-one with the battery cell assembly. For the corresponding cell assembly and the air guide (111), the size of the air guide (111) in the second direction (F2) is smaller than the size of the cell assembly in the second direction (F2).

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

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