Battery pack and electrical device having it

Abstract

The main objective of this invention is to provide a battery pack and an electrical device having the same. The battery pack includes: a battery assembly comprising multiple batteries; and a first heat exchange plate disposed on the side of the batteries. The sidewall of the battery facing the first heat exchange plate partially contacts and thermally conducts with the first heat exchange plate. The sidewall of the battery facing the first heat exchange plate has a surface area S1, and there is a contact area S2 between the battery and the first heat exchange plate. The surface area S1 and the contact area S2 satisfy the condition: 0.1 ≤ S2 / S1 ≤ 0.9. The technical solution of this application effectively solves the problem in related technologies where batteries are prone to abnormal explosions during normal internal gas generation, leading to battery failure.

Description

Technical Field

[0001] This utility model patent relates to the field of battery technology, specifically to a battery pack and an electrical device having the same. Background Technology

[0002] In existing technologies, new energy electric vehicles are powered by battery packs. These battery packs generate a significant amount of heat during operation, which affects their performance. To improve the heat dissipation efficiency of the battery pack, heat exchange plates can be installed between adjacent rows of battery cells. Coolant flowing through the channels of these heat exchange plates dissipates heat from the battery pack.

[0003] However, because the battery and heat exchange plate occupy the battery's expansion space, the battery is prone to abnormal explosion when it is generating gas normally inside, which can lead to battery failure. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack and an electrical device thereon to solve the problem in related technologies where batteries are prone to abnormal explosions during normal gas production, leading to battery failure.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a battery group including a plurality of batteries; a first heat exchange plate disposed on the side of the batteries, wherein the sidewall of the batteries facing the first heat exchange plate partially contacts and thermally engages with the first heat exchange plate, the sidewall of the batteries facing the first heat exchange plate has a surface area S1, and there is a contact area S2 between the batteries and the first heat exchange plate, wherein the surface area S1 and the contact area S2 satisfy the following condition: 0.1≤S2 / S1≤0.9.

[0006] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0007] By applying the technical solution of this utility model, the first heat exchange plate is disposed on the side of the battery, enabling the first heat exchange plate to achieve heat exchange with the battery through thermal conduction cooperation with the side of the battery, thereby improving the battery's thermal management capability. The side wall of the battery facing the first heat exchange plate partially contacts and thermally conducts with the first heat exchange plate, and the surface area S1 of the side wall of the battery facing the first heat exchange plate and the contact area S2 between the battery and the first heat exchange plate satisfy the following: 0.1≤S2 / S1≤0.9. Since the battery undergoes a series of complex electrochemical reactions during operation, a certain amount of gas is generated, causing the battery to expand. When the battery expands, the portion of the side wall of the battery facing the first heat exchange plate that is not in contact with the first heat exchange plate can expand outward, preventing the battery from exploding. At the same time, by limiting the ratio of surface area S1 to contact area S2, sufficient expansion space can be provided for the battery while ensuring heat dissipation. Therefore, the technical solution of this application can effectively solve the problem in related technologies where abnormal explosions easily occur during normal gas generation inside the battery, leading to battery failure. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0009] Figure 1 A perspective view of an embodiment of the battery pack according to the present invention is shown;

[0010] Figure 2 It shows Figure 1 A three-dimensional structural diagram of the battery in the battery pack;

[0011] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the heat exchange structure of the battery pack;

[0012] Figure 4 It shows Figure 1 The heat exchange structure of the battery pack and a cross-sectional schematic diagram of the battery are shown.

[0013] Figure 5 It shows Figure 4 An enlarged diagram of point A in the diagram.

[0014] The above figures include the following reference numerals:

[0015] 10. Battery pack; 11. Battery; 111. Third sidewall; 112. Fourth sidewall; 12. Terminal post;

[0016] 20. First heat exchange plate; 201. Planar region; 202. Recessed region; 203. Heat exchange channel; 21. First sidewall; 22. Second sidewall;

[0017] 30. Elastic thermally conductive medium;

[0018] 40. Second heat exchange plate;

[0019] 50. Third heat exchange plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] like Figures 1 to 5As shown, this application provides a battery pack, including a battery pack 10 and a first heat exchange plate 20. The battery pack 10 includes a plurality of batteries 11; the first heat exchange plate 20 is disposed on the side of the batteries 11, and the sidewall of the batteries 11 facing the first heat exchange plate 20 partially contacts and thermally engages with the first heat exchange plate 20. Each battery 11 has a surface area S1 and a contact area S2, wherein the surface area S1 and the contact area S2 satisfy the condition: 0.1 ≤ S2 / S1 ≤ 0.9.

[0024] Applying the technical solution of this embodiment, the first heat exchange plate 20 is disposed on the side of the battery 11, enabling the first heat exchange plate 20 to achieve heat exchange with the battery 11 through thermally conductive cooperation with the side of the battery 11, thereby improving the thermal management capability of the battery 11. The side wall of the battery 11 facing the first heat exchange plate 20 is in partial contact with the first heat exchange plate 20 and thermally conductively cooperates with it. The surface area S1 of the side wall of the battery 11 facing the first heat exchange plate 20 and the contact area S2 between the battery 11 and the first heat exchange plate 20 satisfy the following: 0.1≤S2 / S1≤0.9. Since the battery 11 undergoes a series of complex electrochemical reactions during operation, a certain amount of gas is generated, causing the battery 11 to expand. When the battery 11 expands, the part of the side wall of the battery 11 facing the first heat exchange plate 20 that is not in contact with the first heat exchange plate 20 can expand outward, preventing the battery 11 from exploding. At the same time, by limiting the ratio of surface area S1 to contact area S2, sufficient expansion space can be provided for the battery 11 while ensuring the heat dissipation effect. Therefore, the technical solution of this embodiment can effectively solve the problem in related technologies that batteries are prone to abnormal explosions when they are generating gas normally inside, resulting in battery failure.

[0025] Preferably, S2 / S1 can be 0.1, 0.2, 0.4, 0.5, 0.6, 0.8 or 0.9.

[0026] Specifically, in this embodiment, the first heat exchange plate 20 is used to cool the battery 11. Of course, in embodiments not shown in the figures, the first heat exchange plate can also be used to heat the battery, for example, when the battery is operating in a low-temperature environment, it is necessary to heat the battery.

[0027] like Figure 2 As shown, the battery 11 has a top wall, a bottom wall, and side walls. The wall on which the terminal posts 12 are disposed is the top wall, the wall on the battery 11 opposite to the top wall is the bottom wall, and the side walls are disposed between the top and bottom walls. In related technologies, heat exchangers are generally provided to exchange heat with the top and / or bottom walls of the battery 11 to perform thermal management of the battery pack. In this embodiment, by providing a first heat exchange plate 20 at the side wall of the battery 11, the thermal management capability of the battery pack is further enhanced.

[0028] like Figure 4 and Figure 5 As shown, the first heat exchange plate 20 has a planar region 201 and a recessed region 202 on its sidewall facing the battery 11. The planar region 201 contacts and thermally engages with the battery 11, while the recessed region 202 is spaced apart from the battery 11. The planar region 201 of the first heat exchange plate 20 contacts and thermally engages with the sidewall of the battery 11, allowing the battery 11 to exchange heat with the first heat exchange plate 20 through the planar region 201. The recessed region 202 provides space for the expansion of the battery 11, preventing the battery 11 from bursting.

[0029] like Figure 4 and Figure 5 As shown, the battery pack also includes an elastic thermally conductive medium 30 disposed within the recessed region 202. The elastic thermally conductive medium 30 is in contact with both the recessed region 202 and the battery 11. The placement of the elastic thermally conductive medium 30 allows heat exchange between the sidewall of the battery 11 and the recessed region 202, corresponding to the location on the recessed region 202, further improving the heat exchange efficiency between the battery 11 and the first heat exchange plate 20. Simultaneously, the elastic thermally conductive medium 30 has elastic deformation capability. When the battery 11 expands, the elastic thermally conductive medium 30 can deform and avoid the expansion of the battery 11, preventing the battery 11 from exploding.

[0030] Specifically, in this embodiment, the elastic modulus λ of the elastic thermally conductive medium 30 satisfies: 0.5MPa ≤ λ ≤ 20MPa. By controlling the elastic modulus λ of the elastic thermally conductive medium 30 within the above range, the elastic thermally conductive medium 30 has sufficient elastic deformation capacity to avoid the expansion of the battery 11. Preferably, the elastic modulus λ of the elastic thermally conductive medium 30 can be 0.5MPa, 3MPa, 5MPa, 8MPa, 15MPa, or 20MPa.

[0031] Specifically, in this embodiment, the thermal conductivity k of the elastic thermally conductive medium 30 satisfies: 0.5 W / m*K ≤ k ≤ 10 W / m*K. By controlling the thermal conductivity k of the elastic thermally conductive medium 30 within the above range, the thermal conductivity of the elastic thermally conductive medium 30 can be guaranteed, thereby improving the heat exchange efficiency between the battery 11 and the first heat exchange plate 20. Preferably, the thermal conductivity k of the elastic thermally conductive medium 30 can be 0.5 W / m*K, 1 W / m*K, 2 W / m*K, 4 W / m*K, or 10 W / m*K.

[0032] like Figure 4 and Figure 5 As shown, the first heat exchange plate 20 has a first sidewall 21 and a second sidewall 22, both of which are in partial contact with and thermally conductive with the battery 11. That is, batteries 11 are provided on both sides of the first heat exchange plate 20 and are thermally conductive with the batteries 11 on both sides, which can fully utilize the heat exchange capacity of the first heat exchange plate 20.

[0033] That is, in this embodiment, the first sidewall 21 and the second sidewall 22 are provided with a planar region 201 and a recessed region 202, respectively, to cooperate with the corresponding battery 11.

[0034] like Figure 2 and Figure 4 As shown, the cross-section of battery 11 is rectangular. Battery 11 has a third sidewall 111 corresponding to the short side of the rectangular structure and a fourth sidewall 112 corresponding to the long side of the rectangular structure. The fourth sidewall 112 is in partial contact with and thermally conductively connected to the first heat exchange plate 20. The surface area S1 and the contact area S2 satisfy the condition: 0.2 ≤ S2 / S1 ≤ 0.8. By making the first heat exchange plate 20 thermally conductively connected to the relatively large sidewall (i.e., the fourth sidewall 112) of battery 11, a large heat exchange area is achieved between the first heat exchange plate 20 and battery 11, thereby improving the thermal management capability of battery 11. At this time, by controlling S2 / S1 within the above range, while achieving heat exchange with a certain contact area S2, the area left for the expansion of battery 11 is also relatively large, thus balancing the heat exchange effect between the first heat exchange plate 20 and battery 11 and the expansion avoidance effect of battery 11. Preferably, S2 / S1 can be 0.2, 0.5, 0.6, 0.7 or 0.8.

[0035] like Figures 3 to 5 As shown, the battery pack also includes a second heat exchange plate 40 connected to the first heat exchange plate 20. The second heat exchange plate 40 contacts and conducts heat with the top wall of the battery 11. The arrangement of the second heat exchange plate 40 allows the top wall of the battery 11 to also be used for heat exchange, improving the thermal management capability of the battery 11.

[0036] With the second heat exchange plate 40 provided, the surface area S1 and the contact area S2 satisfy the condition: 0.4 ≤ S2 / S1 ≤ 0.6. Because the second heat exchange plate 40 is provided, the heat exchange area between the battery 11 and the heat exchange structure is increased. This allows the contact area S2 on the sidewall of the battery 11 to be relatively small, resulting in a relatively large clearance area on the first heat exchange plate 20 for the expansion of the battery 11, further improving the ability to prevent the battery 11 from exploding. Preferably, S2 / S1 can be 0.4, 0.5, or 0.6.

[0037] like Figure 1 , Figure 2 and Figure 4 As shown, a terminal post 12 is provided on the top wall of the battery 11, and the terminal post 12 is thermally connected to the second heat exchange plate 40. During the operation of the battery 11, the heat generated by the terminal post 12 is relatively large. The second heat exchange plate 40 simultaneously cools the terminal post 12, which can effectively prevent the terminal post 12 from malfunctioning.

[0038] It should be noted that the aforementioned "thermal conduction connection between the electrode post 12 and the second heat exchange plate 40" can be a direct thermal conduction connection or an indirect thermal conduction connection. For example, a direct thermal conduction connection can be achieved by the electrode post 12 directly contacting the second heat exchange plate 40 to achieve thermal conduction, while an indirect thermal conduction connection can be achieved by the second heat exchange plate 40 contacting the busbar connecting the electrode post 12 to achieve thermal conduction.

[0039] like Figures 3 to 5 As shown, the battery pack also includes a third heat exchange plate 50 connected to the first heat exchange plate 20. The third heat exchange plate 50 is disposed opposite to the second heat exchange plate 40 and contacts the bottom wall of the battery 11 for thermal conduction. Flow channels are provided on the second heat exchange plate 40 and / or the third heat exchange plate 50. The first heat exchange plate 20, the second heat exchange plate 40, and the third heat exchange plate 50 together form an "I"-shaped heat exchange structure.

[0040] like Figure 2 , Figure 4 and Figure 5 As shown, along the direction from the top wall to the bottom wall of the battery 11, the first heat exchange plate 20 has a planar region 201, a recessed region 202, and another planar region 201 sequentially arranged on the side wall facing the battery 11. That is, the planar region 201 is located near the top and bottom ends of the first heat exchange plate 20, and the recessed region 202 is located in the middle of the first heat exchange plate 20. This arrangement ensures the connection strength between the first heat exchange plate 20 and the battery 11 and provides good support for the battery 11. At the same time, the structure of the side wall of the first heat exchange plate 20 is adapted to the deformation of the battery 11 when it expands. Specifically, since the two ends of the battery 11 are connected to the top wall and the bottom wall respectively along the height direction, the two ends of the battery 11 are relatively stable and not easily expanded. Therefore, the middle region of the battery 11 is more likely to expand than the two ends of the battery 11.

[0041] like Figure 4 still Figure 5 As shown, along the direction from the top wall to the bottom wall of the battery 11, the depth d1 of the recessed region 202 first increases and then decreases. By making the depth d1 of the recessed region 202 satisfy the above-mentioned trend, the shape of the recessed region 202 is adapted to the deformation of the battery 11 when it expands.

[0042] like Figure 5 As shown, the maximum recess depth d11 of the recessed region 202 satisfies: 0.2mm ≤ d11 ≤ 4mm. Keeping the maximum recess depth d11 within this range provides sufficient space for the expansion and deformation of the battery 11, while reducing the impact of the recessed region 202 on the thickness of the first heat exchange plate 20. Preferably, d11 can be 0.2mm, 0.5mm, 1mm, 2mm, or 4mm.

[0043] like Figure 5As shown, the maximum recess depth d11 of the recessed region 202 and the maximum thickness t1 of the first heat exchange plate 20 satisfy the following ratio: 0.1 ≤ d11 / t1 ≤ 0.3. By ensuring that the ratio of the maximum recess depth d11 to the maximum thickness t1 is within the above range, sufficient space is provided for the expansion and deformation of the battery 11, while reducing the impact of the recessed region 202 on the thickness of the first heat exchange plate 20. Preferably, d11 / t1 can be 0.1, 0.15, 0.2, or 0.3.

[0044] like Figure 4 and Figure 5 As shown, along the direction from the top wall to the bottom wall of the battery 11, the maximum recessed position of the recessed region 202 is spaced apart by a distance d2 from the end of the first heat exchange plate 20. The first heat exchange plate 20 has a height dimension d3, and the distance d2 and the height dimension d3 satisfy the following ratio: 0.2 ≤ d2 / d3 ≤ 0.8. The ratio between the distance d2 and the height dimension d3 is within the above range, such that the maximum recessed position of the recessed region 202 is located in the middle of the height direction of the first heat exchange plate 20, to adapt to the deformation of the battery 11 when it expands. Preferably, d2 / d3 can be 0.2, 0.45, 0.5, 0.55, or 0.8.

[0045] like Figure 4 and Figure 5 As shown, along the direction from the top wall to the bottom wall of the battery 11, the first heat exchange plate 20 has multiple heat exchange channels 203. The sidewalls of the heat exchange channels 203 and the sidewalls of the first heat exchange plate 20 facing the battery 11 have a wall thickness t2, which satisfies the condition: 0.4mm ≤ t2 ≤ 3mm. By providing the heat exchange channels 203, a heat exchange medium can be introduced into the first heat exchange plate 20 to achieve heat exchange with the battery 11. The wall thickness t2, within the aforementioned range, ensures the structural strength of the first heat exchange plate 20 itself. Preferably, t2 can be 0.4mm, 0.9mm, 1mm, 1.1mm, 2mm, or 3mm.

[0046] It should be noted that when describing the embodiments of this application, the terms "maximum thickness t1", "wall thickness t2", "maximum recess depth d11" and "recess depth d1" all refer to the dimensions of the relevant structure in the direction perpendicular to the height of the battery 11.

[0047] Due to the recessed area 202, the wall thickness t2 at various points on the first heat exchange plate 20 is not constant. The above-mentioned "wall thickness t2 satisfies: 0.4mm≤t2≤3mm" means that the wall thickness t2 at various points on the first heat exchange plate 20 meets the above requirements.

[0048] like Figure 4 and Figure 5As shown, in order to meet the above requirements regarding wall thickness t2, the width of the heat exchange channel 203 (the dimension of the heat exchange channel 203 in the direction perpendicular to the height direction of the battery 11) gradually decreases from the end (specifically the upper and lower ends) of the first heat exchange plate 20 to the middle.

[0049] This application also provides an electrical device, an embodiment of which includes a battery pack, wherein the battery pack is the aforementioned battery pack. The aforementioned battery pack effectively solves the problem in related technologies where batteries are prone to abnormal explosions during normal gas generation, leading to battery failure. The electrical device having the aforementioned battery pack also possesses the aforementioned advantages.

[0050] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: A battery pack (10) comprising multiple batteries (11); A first heat exchange plate (20) is disposed on the side of the battery (11). The side wall of the battery (11) facing the first heat exchange plate (20) is in partial contact with the first heat exchange plate (20) and conducts heat together. The side wall of the battery (11) facing the first heat exchange plate (20) has a surface area S1. The battery (11) and the first heat exchange plate (20) have a contact area S2. The surface area S1 and the contact area S2 satisfy the following condition: 0.1≤S2 / S1≤0.

9.

2. The battery pack according to claim 1, characterized in that, The first heat exchange plate (20) has a planar region (201) and a recessed region (202) on the side wall facing the battery (11). The planar region (201) is in contact with the battery (11) and conducts heat together, while the recessed region (202) is spaced apart from the battery (11).

3. The battery pack according to claim 2, characterized in that, The battery pack also includes an elastic thermally conductive medium (30) disposed in the recessed area (202), the elastic thermally conductive medium (30) being in contact with both the recessed area (202) and the battery (11).

4. The battery pack according to claim 3, characterized in that, The elastic modulus λ of the elastic thermally conductive medium (30) satisfies: 0.5MPa≤λ≤20MPa; and / or, The thermal conductivity k of the elastic thermally conductive medium (30) satisfies: 0.5W / m*K≤k≤10W / m*K.

5. The battery pack according to any one of claims 1 to 4, characterized in that, The first heat exchange plate (20) has a first sidewall (21) and a second sidewall (22), both of which are in partial contact with the battery (11) and thermally conductive.

6. The battery pack according to any one of claims 1 to 4, characterized in that, The battery (11) has a rectangular cross-section. The battery (11) has a third sidewall (111) corresponding to the short side of the rectangular structure and a fourth sidewall (112) corresponding to the long side of the rectangular structure. The fourth sidewall (112) is in partial contact with the first heat exchange plate (20) and conducts heat together. The surface area S1 and the contact area S2 satisfy the following condition: 0.2≤S2 / S1≤0.

8.

7. The battery pack according to any one of claims 1 to 4, characterized in that, The battery pack also includes a second heat exchange plate (40) connected to the first heat exchange plate (20), the second heat exchange plate (40) contacting and thermally engaging with the top wall of the battery (11).

8. The battery pack according to claim 7, characterized in that, The surface area S1 and the contact area S2 satisfy the following condition: 0.4 ≤ S2 / S1 ≤ 0.

6.

9. The battery pack according to claim 7, characterized in that, The battery (11) has a terminal post (12) on its top wall, and the terminal post (12) is thermally connected to the second heat exchange plate (40).

10. The battery pack according to any one of claims 2 to 4, characterized in that, Along the direction from the top wall to the bottom wall of the battery (11), the first heat exchange plate (20) has the planar region (201), the recessed region (202) and the planar region (201) sequentially arranged on the side wall of the battery (11) facing the battery (11).

11. The battery pack according to claim 10, characterized in that, Along the direction from the top wall to the bottom wall of the battery (11), the depth d1 of the recessed region (202) first increases and then decreases.

12. The battery pack according to claim 11, characterized in that, The maximum depression depth d11 of the depression region (202) satisfies: 0.2mm≤d11≤4mm.

13. The battery pack according to claim 11, characterized in that, The maximum depression depth d11 of the recessed region (202) and the maximum thickness t1 of the first heat exchange plate (20) satisfy the following condition: 0.1≤d11 / t1≤0.

3.

14. The battery pack according to claim 11, characterized in that, Along the direction from the top wall to the bottom wall of the battery (11), the maximum recessed position of the recessed area (202) is spaced by a distance d2 between it and the end of the first heat exchange plate (20). The first heat exchange plate (20) has a height dimension d3. The distance d2 and the height dimension d3 satisfy the following condition: 0.2≤d2 / d3≤0.

8.

15. The battery pack according to any one of claims 1 to 4, characterized in that, Along the direction from the top wall to the bottom wall of the battery (11), the first heat exchange plate (20) has a plurality of heat exchange channels (203), and the side wall of the heat exchange channel (203) and the side wall of the first heat exchange plate (20) facing the battery (11) have a wall thickness t2, which satisfies: 0.4mm≤t2≤3mm.

16. An electrical device comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 15.

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