Battery pack and electric device

Abstract

The application provides a battery pack and an electric device, and relates to the field of power batteries. The battery pack comprises a box body, a connecting structure and a plurality of liquid cooling plate bodies. The liquid cooling plate body comprises a bottom plate and a side plate. The bottom plate has a first direction and a second direction perpendicular to each other. The bottom plate extends along the first direction. One side plate is connected to each side of the bottom plate along the second direction. Each side plate is connected to the bottom plate at an angle greater than zero to form an installation space for accommodating a battery cell group. The bottom plates in the plurality of liquid cooling plate bodies are arranged at intervals along the second direction. The two side plates between the two adjacent bottom plates are arranged at intervals and are connected through the connecting structure. The two side plates between the two adjacent bottom plates and the connecting structure form a fixing groove. The inside of the box body is provided with a beam structure which is inserted into the fixing groove. The battery pack and the electric device provided by the application solve the technical problem of poor heat dissipation effect of the battery pack in the prior art.

Description

Technical Field

[0001] This application relates to the field of power batteries, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] With the continuous development of the economy and new energy technologies, electrochemical energy storage products are becoming increasingly mature in the market. Among them, the power battery pack is the core of the research and development of electrochemical energy storage products. Each battery pack is composed of multiple battery modules, and each battery module is composed of multiple batteries connected in series and parallel.

[0003] In recent years, to improve the energy density of energy storage systems, power battery packs have generally adopted large square aluminum-cased cells. These cells are characterized by their thickness, height, and overall large size. However, there is still market demand for high-rate electrochemical energy storage systems. High-rate operation places higher demands on individual battery cells, leading to significant heat generation during operation, especially with the use of large square aluminum-cased cells. Therefore, controlling the temperature rise and achieving thermal equilibrium during battery operation has become a pressing problem that needs to be solved.

[0004] Traditional energy storage battery packs typically employ a heat dissipation method by adding a heat sink to the bottom of the battery. This method is generally used in electrochemical energy storage products that operate at low rates and generate less heat. However, under high-rate operating conditions, the large square aluminum-cased battery cells exhibit significant temperature differences between the top and bottom, making it difficult to guarantee temperature consistency within the battery and the battery module / pack. This further complicates temperature control and significantly impacts the overall lifespan of the energy storage product. Utility Model Content

[0005] The purpose of this application is to provide a battery pack and power device to solve the technical problem of poor heat dissipation in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: In the first aspect, the battery pack provided by this utility model includes a housing and multiple liquid cooling plate bodies; The liquid cooling plate body includes a base plate and side plates. The base plate has a first direction and a second direction that are perpendicular to each other. The base plate extends along the first direction. The base plate is connected to a side plate on each side of the second direction. Each side plate is connected to the base plate at an angle greater than zero degrees to form an installation space for accommodating the battery cell assembly. The base plates in the plurality of liquid cooling plate bodies are spaced apart along the second direction; The two side plates between two adjacent bottom plates are spaced apart and connected by a connecting structure, and a fixing groove is formed between the two side plates between two adjacent bottom plates and the connecting structure; The box body has a beam structure inside, and the beam structure is inserted into the fixing groove.

[0007] Furthermore, the liquid cooling plate body has a flow channel, and the connecting structure has an injection port and an outlet port communicating with the flow channel, and they are spaced apart.

[0008] Furthermore, both the injection port and the outlet are located on the side of the connecting structure away from the side plate, and are spaced apart.

[0009] Furthermore, the connection structure includes a connecting plate, through which two adjacent side plates of two adjacent liquid cooling plate bodies are connected.

[0010] Furthermore, the base plate, the side plate, and the connecting plate are integrally connected.

[0011] Furthermore, the connecting structure includes a bent plate integrally connected to the side plate; The bent plate and the side plate are connected at an angle to the side away from the bottom plate and extend in a direction away from the installation space; Two of the two adjacent side plates in two adjacent liquid-cooled plate bodies overlap and are connected.

[0012] Furthermore, the two side plates in the same liquid cooling plate body are respectively the first side plate and the second side plate, the bending plate connected to the first side plate is the first bending plate, and the bending plate connected to the second side plate is the second bending plate; The height of the first side plate is greater than the height of the second side plate; In the two adjacent liquid-cooled plate bodies, the first bent plate overlaps the upper part of the first side plate and the second side plate.

[0013] Furthermore, the liquid cooling plate body includes a first liquid cooling plate body and a second liquid cooling plate body, the two side plates in the first liquid cooling plate body have the same height, the two side plates in the second liquid cooling plate body have the same height, and the height of the side plate of the first liquid cooling plate body is greater than the height of the side plate of the second liquid cooling plate body. The first liquid cooling plate body and the second liquid cooling plate body are arranged alternately along the second direction, and in the two adjacent side plates of the first liquid cooling plate body and the second liquid cooling plate body, the bent plate of the first liquid cooling plate body overlaps the bent plate of the second liquid cooling plate body.

[0014] Furthermore, this includes battery packs; The battery cell assembly is installed in the installation space.

[0015] Secondly, the electrical device provided by this utility model includes a battery pack as described in any of the above claims.

[0016] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows: The battery pack provided by this utility model includes a housing and multiple liquid cooling plate bodies; each liquid cooling plate body includes a bottom plate and side plates. The bottom plate has a first direction and a second direction that are perpendicular to each other. The bottom plate extends along the first direction, and a side plate is connected to each side of the bottom plate in the second direction. Each side plate is connected to the bottom plate at an angle greater than zero degrees to form an installation space for accommodating the battery cell assembly. The bottom plates in the multiple liquid cooling plate bodies are spaced apart along the second direction. The two side plates between two adjacent bottom plates are spaced apart and connected by a connecting structure. The two side plates between two adjacent bottom plates form a fixing groove with the connecting structure. The housing has a beam structure inside, and the fixing groove is installed in the beam structure.

[0017] An installation space is formed between the base plate and the side plates connected to the base plate in a single liquid-cooled plate body. This space is used to install the battery cell assembly, with the bottom surface of the battery cell assembly contacting the base plate and the two sides of the battery cell assembly contacting the two side plates respectively. This achieves three-sided heat exchange on the bottom and two sides of the assembled battery cell assembly, which effectively increases the heat exchange area and improves heat exchange efficiency compared to the traditional bottom-only heat exchange cooling solution. In addition, the dimensions of the installation space are matched with the dimensions of the battery cell assembly, ensuring that all three sides of the battery cell assembly are in close contact with the liquid-cooled plate body for heat exchange; that is, the spacing between the two side plates and the length of the base plate are matched with the width and length of the battery cell assembly.

[0018] Two adjacent side plates of two liquid cooling plate bodies are connected by a connecting structure to connect multiple liquid cooling plate bodies, thereby enabling heat exchange and cooling of multiple battery cell groups; multiple liquid cooling plate bodies are connected together by a connecting structure, making it convenient to place the liquid cooling plate bodies inside the box.

[0019] Two adjacent side plates of two liquid-cooled plate bodies form a fixing groove with the connecting structure. When multiple liquid-cooled plate bodies are placed in the box, the beam structure in the box is inserted into the fixing groove. The beam structure supports, positions and fixes the multiple liquid-cooled plate bodies.

[0020] The liquid cooling plate body uses a base plate and two side plates to exchange heat on three sides of the battery cell pack, avoiding the problem of large temperature differences between the top and bottom of the battery cell pack, ensuring the temperature consistency of the battery module, and extending the service life of the battery pack. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the battery pack structure provided in this embodiment. Figure 1 ; Figure 2 This is a schematic diagram of the battery pack structure provided in this embodiment. Figure 2 ; Figure 3 This is a schematic diagram of the battery pack structure provided in this embodiment. Figure 3 ; Figure 4 This is a schematic diagram of the battery pack structure provided in this embodiment. Figure 4 ; Figure 5 This is a schematic diagram of the battery pack structure provided in this embodiment. Figure 5 .

[0023] icon: 100 - Liquid cooling plate body; 110 - Base plate; 120 - Side plate; 130 - Bending plate; 131 - First bending plate; 132 - Second bending plate; 121 - First side plate; 122 - Second side plate; 140 - First liquid cooling plate body; 150 - Second liquid cooling plate body; 160 - Installation space; 170 - Fixing groove; 200 - Connection structure; 210 - Injection port; 220 - Outlet port; 230 - Connection plate; 300-cell pack; 400 - Box structure; 410 - Beam structure; a - First direction; b - Second direction; c - Third direction. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Example 1 A good heat exchange system is a crucial component of power batteries. Insufficient heat dissipation during battery pack use can lead to performance degradation, resulting in customer complaints and even safety risks. As market demands for the range of new energy vehicles increase, the size of the prismatic battery cells used is getting larger, and the cell height is also increasing. Conventional bottom water cooling cannot meet the requirements of fast charging. However, due to the limited internal space of the battery pack, adding a water cooling system would take up a lot of space and reduce volume utilization.

[0028] In view of this, the battery pack provided in this embodiment of the present invention includes a housing 400 and a plurality of liquid cooling plate bodies 100; the liquid cooling plate body 100 includes a bottom plate 110 and a side plate 120, the bottom plate 110 has a first direction a and a second direction b that are perpendicular to each other, the bottom plate 110 extends along the first direction a, and a side plate 120 is connected to each side of the bottom plate 110 in the second direction b, and each side plate 120 is connected to the bottom plate 110 at an angle greater than zero degrees to form an installation space 160 for accommodating the battery cell assembly 300; the bottom plates 110 in the plurality of liquid cooling plate bodies 100 are spaced apart along the second direction b; the two side plates 120 between two adjacent bottom plates 110 are spaced apart and connected by a connecting structure 200, and a fixing groove 170 is formed between the two side plates 120 between two adjacent bottom plates 110 and the connecting structure 200; a beam structure 410 is provided inside the housing 400, and the beam structure 410 is inserted into the fixing groove 170. In this embodiment, the perpendicularity of the first direction a and the second direction b is not geometric perpendicularity in the mathematical field. Considering the error in production and processing, the included angle between the first direction a and the second direction b should be understood as perpendicular if it is between 85° and 95°.

[0029] Specifically, see Figure 1 and Figure 2 The base plate 110 has a first direction a, a second direction b, and a third direction c that are perpendicular to each other; both the base plate 110 and the side plate 120 are rectangular, the length direction of the base plate 110 is set along the first direction a, the width direction of the base plate 110 is set along the second direction b, and the thickness direction of the base plate 110 is set along the third direction c; the side plate 120 is perpendicularly connected to the base plate 110; the length direction of the side plate 120 is set along the first direction a, the width direction of the side plate 120 is set along the third direction c, and the thickness direction of the side plate 120 is set along the second direction b. Furthermore, multiple liquid cooling plate bodies 100 are connected to form a serrated liquid cooling plate. The size is adjusted and matched according to the size of different battery cell groups 300. The battery cell group 300 is connected and assembled with multiple liquid cooling plate bodies 100. The assembled battery cell group 300 can achieve three-sided heat exchange on the bottom and sides. In addition, after the battery cell group 300 and the serrated liquid cooling plate are integrated, they are matched with housings 400 of different sizes as a whole module. The serrated liquid cooling plate can be fixed to the housing 400 as a structural component. It can be completely disassembled and replaced during after-sales maintenance, which is convenient for maintenance.

[0030] In a single liquid-cooled plate body 100, an installation space 160 is formed between the bottom plate 110 and the two side plates 120 for mounting the battery cell assembly 300 within the installation space 160. The bottom surface of the battery cell assembly 300 contacts the bottom plate 110, and the two sides of the battery cell assembly 300 contact the two side plates 120 respectively. This achieves three-sided heat exchange on the bottom and two sides of the assembled battery cell assembly 300, which effectively increases the heat exchange area and improves heat exchange efficiency compared to the traditional bottom-only heat exchange cooling solution. In addition, the dimensions of the installation space 160 are matched with the dimensions of the battery cell assembly 300, so that all three sides of the battery cell assembly 300 are in close contact with the liquid-cooled plate body 100 for heat exchange; that is, the spacing between the two side plates 120 and the length of the bottom plate 110 are matched with the width and length of the battery cell assembly 300.

[0031] Two adjacent side plates 120 of two adjacent liquid cooling plate bodies 100 are connected by a connecting structure 200 to realize the connection of multiple liquid cooling plate bodies 100, thereby enabling heat exchange and cooling of multiple battery cell groups 300; multiple liquid cooling plate bodies 100 are connected together by the connecting structure 200, making it convenient to place multiple liquid cooling plate bodies 100 inside the housing 400.

[0032] See Figure 5 In two adjacent liquid cooling plate bodies 100, two adjacent side plates 120 and connecting structure 200 form a fixing groove 170. When multiple liquid cooling plate bodies 100 are placed in the box 400, the beam structure 410 in the box 400 is inserted into the fixing groove 170. The beam structure 410 supports, positions and fixes the multiple liquid cooling plate bodies 100.

[0033] The liquid cooling plate body 100 uses the base plate 110 and two side plates 120 to exchange heat on three sides of the cell pack 300, avoiding the problem of large temperature difference between the top and bottom of the cell pack 300, ensuring the temperature consistency of the battery module, and extending the service life of the battery pack.

[0034] The structure and shape of the battery pack are described in detail below: In the optional embodiment of this utility model, the liquid cooling plate body 100 has a flow channel, and the connecting structure 200 has a liquid injection port 210 and a liquid outlet 220 communicating with the flow channel.

[0035] Specifically, multiple outlets 220 are provided, and all outlets 220 are connected to the injection port 210 through a flow channel. The cross-section of the flow channel can be circular, and the axis of the flow channel can be S-shaped, L-shaped, or straight, etc., without limitation.

[0036] The flow channel allows the cooling medium to flow through the interior of the liquid cooling plate body 100, where it exchanges heat with the battery cell assembly 300 to achieve heat dissipation and cooling. The injection port 210 is used to inject the cooling medium, and the outlet port 220 is used to discharge the cooling medium.

[0037] In the optional solution provided by this utility model embodiment, the injection port 210 and the outlet port 220 are both located on the side of the connecting structure 200 away from the side plate 120, and are spaced apart.

[0038] Specifically, see Figure 1 The injection port 210 and the outlet 220 are spaced apart along the first direction a.

[0039] Both the injection port 210 and the outlet port 220 are located at the top of the connecting structure 200, which facilitates communication between the injection port 210 and the outlet port 220 and other parts to allow the cooling medium to be input or output.

[0040] As a first embodiment of the connection structure 200, see Figure 1 and Figure 2 The connection structure 200 includes a connection plate 230, and two adjacent side plates 120 of two adjacent liquid cooling plate bodies 100 are connected by the connection plate 230.

[0041] Specifically, the connecting plate 230 is elongated, with its length along a first direction a and its width along a second direction b. The width of the connecting plate 230 is less than the width of the bottom plate 110 to avoid occupying too much space within the housing 400. Furthermore, the connecting plate 230 is perpendicularly connected to the side plates 120. Preferably, the two side walls of the connecting plate 230 are respectively attached to the opposing surfaces of the two side plates 120, and the connecting plate 230 is connected to the top of the side plates 120, increasing the volume of the fixing groove 170.

[0042] The connecting plate 230 connects the two adjacent side plates 120 in the two adjacent liquid cooling plate bodies 100, and simplifies the structure of the entire serrated liquid cooling plate, forming a serrated structure.

[0043] In the optional embodiment of this utility model, the base plate 110, the side plate 120 and the connecting plate 230 are integrally connected.

[0044] Specifically, a serrated liquid cooling plate with a base plate 110, a side plate 120, and a connecting plate 230 is formed by injection molding using a mold.

[0045] The base plate 110, side plate 120 and connecting plate 230 are connected as a whole, which improves the connection strength between two adjacent components.

[0046] As a second embodiment of the connection structure 200, see Figure 3 and Figure 4 The connecting structure 200 includes a bent plate 130 integrally connected to the side plate 120; the bent plate 130 is connected at an angle to the side of the side plate 120 away from the bottom plate 110 and extends in a direction away from the installation space 160; the two bent plates 130 of the two adjacent side plates 120 of the two adjacent liquid cooling plate bodies 100 overlap and are connected.

[0047] Specifically, the top of the side plate 120 is bent outward to form a bent plate 130; the bent plate 130 is perpendicular to the side plate 120. In two adjacent liquid cooling plate bodies 100, one bent plate 130 of one liquid cooling plate body 100 overlaps with one bent plate 130 of the other liquid cooling plate body 100; the two overlapping bent plates 130 are fixed by at least one of screwing, welding, bonding, and riveting. Preferably, in the two overlapping bent plates 130, the side wall of the lower bent plate 130 abuts against the side plate 120 connected to the other bent plate 130, enhancing the connection strength between the two liquid cooling plate bodies 100.

[0048] By using a bending plate 130 integrally connected to the side plate 120, two adjacent liquid cooling plate bodies 100 can be connected, allowing each liquid cooling plate body 100 to be injection molded independently, thus avoiding the problem of large mold size and high failure rate when injection molding the entire serrated liquid cooling plate.

[0049] In the optional solution provided by this utility model embodiment, the two side plates 120 in the same liquid cooling plate body 100 are respectively the first side plate 121 and the second side plate 122. The bent plate 130 connected to the first side plate 121 is the first bent plate 131, and the bent plate 130 connected to the second side plate 122 is the second bent plate 132. The height of the first side plate 121 is greater than the height of the second side plate 122. In the two adjacent liquid cooling plate bodies 100, the first bent plate 131 overlaps the upper part of the second bent plate 132.

[0050] Specifically, see Figure 3 The first bent plate 131 of the liquid cooling plate body 100 on the left overlaps the second bent plate 132 of the liquid cooling plate body 100 in the middle, and the first bent plate 131 of the liquid cooling plate body 100 in the middle overlaps the second bent plate 132 of the liquid cooling plate body 100 on the right. The multiple liquid cooling plate bodies 100 in the same serrated liquid cooling plate have the same shape and size, and can be produced using a set of molds.

[0051] By utilizing the height difference between the first side plate 121 and the second side plate 122, the first bending plate 131 of two adjacent liquid cooling plate bodies 100 can overlap the top of the second bending plate 132, thereby achieving the connection between the two adjacent liquid cooling plate bodies 100.

[0052] In the optional embodiment of this utility model, the liquid cooling plate body 100 includes a first liquid cooling plate body 140 and a second liquid cooling plate body 150. The two side plates 120 in the first liquid cooling plate body 140 have the same height, and the two side plates 120 in the second liquid cooling plate body 150 have the same height. The height of the side plate 120 of the first liquid cooling plate body 140 is greater than the height of the side plate 120 of the second liquid cooling plate body 150. The first liquid cooling plate body 140 and the second liquid cooling plate body 150 are arranged alternately along the second direction b. In the two adjacent side plates 120 of the first liquid cooling plate body 140 and the second liquid cooling plate body 150, the bent plate 130 of the first liquid cooling plate body 140 overlaps with the bent plate 130 of the second liquid cooling plate body 150.

[0053] Specifically, see Figure 4 The first liquid cooling plate body 140 and the second liquid cooling plate body 150 are arranged alternately in sequence.

[0054] In the two adjacent side plates 120 of the first liquid cooling plate body 140 and the second liquid cooling plate body 150, the bent plate 130 of the first liquid cooling plate body 140 overlaps with the bent plate 130 of the second liquid cooling plate body 150, thereby connecting the two adjacent liquid cooling plate bodies 100.

[0055] In the optional solution provided by this utility model embodiment, the battery pack includes a cell assembly 300; the cell assembly 300 is installed in the installation space 160.

[0056] Specifically, after the battery cell assembly 300 is assembled between multiple liquid cooling plate bodies 100, the battery cell assembly 300 and the liquid cooling plate body 100 are installed as an integral module in the housing 400; the beam structure 410 is inserted into the fixing groove 170; fasteners pass through the connecting structure 200, such as the connecting plate 230, and are connected to the beam structure 410, thereby fixing the multiple liquid cooling plate bodies 100 in the housing 400.

[0057] Multiple liquid cooling plate bodies 100 and battery cell 300 modules are integrated into one unit, saving internal space of the housing 400 and improving volume utilization; the serrated liquid cooling plate is in contact with the battery cell assembly 300 on three sides, realizing three-sided heat exchange of the battery cell assembly 300 and improving heat exchange efficiency; the integrated module after the serrated liquid cooling plate and battery cell 300 modules are integrated can be fixed to the housing 400, which is convenient for after-sales replacement and maintenance.

[0058] Example 2 The electrical device provided in this embodiment includes the battery pack described in Embodiment 1, and therefore also possesses all the beneficial effects of Embodiment 1, which will not be repeated here.

[0059] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The enclosure (400), the connecting structure (200), and multiple liquid cooling plate bodies (100) are included. The liquid cooling plate body (100) includes a base plate (110) and a side plate (120). The base plate (110) has a first direction (a) and a second direction (b) that are perpendicular to each other. The base plate (110) extends along the first direction (a). The base plate (110) is connected to a side plate (120) on each side of the second direction (b). Each side plate (120) is connected to the base plate (110) at an angle greater than zero degrees to form an installation space (160) for accommodating the battery cell assembly (300). The base plates (110) of the plurality of liquid-cooled plate bodies (100) are spaced apart along the second direction (b); Two side plates (120) located between two adjacent bottom plates (110) are spaced apart and connected by the connecting structure (200). A fixing groove (170) is formed between the two side plates (120) located between two adjacent bottom plates (110) and the connecting structure (200). The box body (400) has a beam structure (410) inside, which is inserted into the fixing groove (170).

2. The battery pack according to claim 1, characterized in that, The liquid cooling plate body (100) has a flow channel, and the connecting structure (200) has a liquid injection port (210) and a liquid outlet (220) communicating with the flow channel.

3. The battery pack according to claim 2, characterized in that, The injection port (210) and the outlet port (220) are both located on the side of the connecting structure (200) away from the side plate (120) and are spaced apart.

4. The battery pack according to claim 3, characterized in that, The connection structure (200) includes a connection plate (230), through which two adjacent side plates (120) of two adjacent liquid cooling plate bodies (100) are connected.

5. The battery pack according to claim 4, characterized in that, The base plate (110), the side plate (120), and the connecting plate (230) are integrally connected.

6. The battery pack according to claim 3, characterized in that, The connecting structure (200) includes a bent plate (130) integrally connected to the side plate (120). The bent plate (130) and the side plate (120) are connected at an angle to the side away from the bottom plate (110) and extend in a direction away from the installation space (160); Two of the two adjacent side plates (120) of the two adjacent liquid-cooled plate bodies (100) overlap and are connected.

7. The battery pack according to claim 6, characterized in that, The two side plates (120) in the same liquid cooling plate body (100) are the first side plate (121) and the second side plate (122), respectively. The bending plate (130) connected to the first side plate (121) is the first bending plate (131), and the bending plate (130) connected to the second side plate (122) is the second bending plate (132). The height of the first side plate (121) is greater than the height of the second side plate (122); In the two adjacent liquid cooling plate bodies (100), the first bent plate (131) overlaps the second bent plate (132) above the first side plate (121) and the second side plate (122).

8. The battery pack according to claim 6, characterized in that, The liquid cooling plate body (100) includes a first liquid cooling plate body (140) and a second liquid cooling plate body (150). The two side plates (120) in the first liquid cooling plate body (140) have the same height, and the two side plates (120) in the second liquid cooling plate body (150) have the same height. The height of the side plate (120) of the first liquid cooling plate body (140) is greater than the height of the side plate (120) of the second liquid cooling plate body (150). The first liquid cooling plate body (140) and the second liquid cooling plate body (150) are arranged alternately along the second direction (b), and in the two adjacent side plates (120) of the first liquid cooling plate body (140) and the second liquid cooling plate body (150), the bent plate (130) of the first liquid cooling plate body (140) overlaps with the bent plate (130) of the second liquid cooling plate body (150).

9. The battery pack according to any one of claims 1-8, characterized in that, Including battery packs (300); The battery cell assembly (300) is installed in the installation space (160).

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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