Battery liquid cooling plate, battery box structure and electric equipment

Abstract

The invention provides a battery liquid cooling plate, a battery box structure and electric equipment, and relates to the field of batteries, the battery liquid cooling plate comprises a first plate body and a second plate body which are oppositely arranged, the second plate body is provided with a functional area, the functional area comprises a first area and a second area, the first area is provided with a connecting piece, and the second area is provided with a second connecting piece; the second plate body is connected with the first plate body through the connecting piece, the second area is limited on the functional area through the connecting piece to form a flow channel, the flow channel is used for cooling liquid to flow through, and the proportion of the second area in the functional area is larger than that of the first area in the functional area. The proportion of the second area in the functional area is larger than that of the first area in the functional area, so that the circulation amount of cooling liquid in the flow channel is large, and waste heat generated by the battery box structure is taken away more quickly and efficiently.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery liquid cooling plate, a battery box structure and electrical equipment. Background Art

[0002] Power batteries are an important part of new energy vehicles, and their lifespan and safety have a significant impact on the performance of the entire vehicle. Power batteries generate a lot of heat during use. In order to avoid failures due to high temperatures, a liquid cooling plate is installed on the surface of the power battery to remove the waste heat generated. This is a common way to solve the problem of high temperature of power batteries.

[0003] The existing battery liquid cooling plate usually includes a first plate and a second plate. The second plate is stamped with an elongated flow channel for circulating the coolant. The first plate is covered on the second plate. The first plate is in direct contact with the surface of the power battery to absorb the heat generated by it. The heat is then transferred to the coolant in the flow channel. The coolant circulates and takes away the heat, thereby achieving cooling of the power battery. Since high-voltage fast-charging and other models will generate a lot of heat during the charging process, and the flow channel of the existing battery liquid cooling plate has a small circulation area, low heat exchange efficiency, and poor cooling effect, it usually cannot meet the use needs of high-voltage fast-charging and other models. Summary of the invention

[0004] The present invention aims to solve the technical problems of low heat exchange efficiency and poor cooling effect of existing battery liquid cooling plates.

[0005] In a first aspect, the present invention provides a battery liquid cooling plate, comprising a first plate body and a second plate body arranged opposite to each other, the second plate body having a functional area, the functional area comprising a first area and a second area, the first area being provided with a connecting member, and the connecting member connecting the second plate body with the first plate body, the second area forming a flow channel on the functional area through the limitation of the connecting member, the flow channel being used for cooling liquid to flow through, and the proportion of the second area in the functional area is greater than the proportion of the first area in the functional area.

[0006] Optionally, the connecting member is formed by a protrusion from the first region, or the connecting member is formed by a protrusion from a portion of the first plate body corresponding to the first region toward the second plate body.

[0007] Optionally, the connecting member includes a first protrusion structure and a second protrusion structure, the first protrusion structure extends in a serpentine shape, and the second protrusion structure is at least partially inserted into the curved space of the first protrusion structure to divide the curved space into two interconnected flow channels.

[0008] Optionally, the first protruding structure is an axisymmetric structure, and the second plate body is provided with a liquid inlet and a liquid outlet, the liquid inlet is located on one side of the middle bending portion of the first protruding structure, and the liquid outlet is located on the other side of the middle bending portion of the first protruding structure; the second protruding structure is inserted into the remaining curved spaces of the first protruding structure except for the curved space corresponding to the middle bending portion.

[0009] Optionally, the connecting member includes a third protrusion structure, two of the third protrusion structures are arranged opposite to each other, and both extend from one end of the second plate body toward the direction close to the other end, a liquid inlet is arranged at one end of the second plate body and in the part between the two third protrusion structures, and a liquid outlet is arranged at one end of the second plate body and on the side away from each other of the two third protrusion structures.

[0010] Optionally, the distance between the two third protrusion structures gradually increases from the end close to the liquid inlet toward the direction away from the liquid inlet; and / or, the connecting member also includes a fourth protrusion structure, and each third protrusion structure is provided with a plurality of fourth protrusion structures on the side away from another third protrusion structure, and the plurality of fourth protrusion structures and the third protrusion structures form a curved flow channel.

[0011] Optionally, the proportion of the orthographic projection area of ​​the second region in the functional area is greater than the proportion of the orthographic projection area of ​​the first region in the functional area.

[0012] Optionally, the second region accounts for more than 70% of the orthographic projection area of ​​the functional area.

[0013] Optionally, the first plate or the first region is fixed to the connecting member by friction stir welding.

[0014] Optionally, the first region or the first plate body has a concave structure on a side facing away from the connecting member.

[0015] Optionally, the second plate body protrudes in a direction close to the first plate body to form a spoiler structure, or the first plate body protrudes in a direction close to the second plate body to form a spoiler structure, the spoiler structure is located in the flow channel, and the spoiler structure is arc-convex.

[0016] Optionally, the first plate is made of one of a sixth series aluminum alloy and a seventh series aluminum alloy;

[0017] And / or, the second plate body is made of one of the third series aluminum alloy, the fourth series aluminum alloy, the fifth series aluminum alloy and the sixth series aluminum alloy.

[0018] Optionally, the first plate body is provided with a first mounting hole, and the second area of ​​the second plate body is provided with a second mounting hole, and the first mounting hole and the second mounting hole are interconnected and used to connect with the battery box structure or related parts of the electrical equipment.

[0019] In a second aspect, the present invention further proposes a battery box structure, comprising a side frame and the above-mentioned battery liquid cooling plate, wherein the battery liquid cooling plate is located at the bottom of the side frame, and when a battery module is placed in the side frame, the battery liquid cooling plate is used to support the battery module.

[0020] In a third aspect, the present invention provides an electrical device comprising the above-mentioned battery box structure.

[0021] The battery liquid cooling plate, battery box structure and electrical equipment of the present invention have at least the following advantages compared with the prior art:

[0022] The first area of ​​the second plate body is connected to the first plate body through a connecting piece to achieve connection between the first plate body and the second plate body; since the proportion of the second area in the functional area is greater than that of the first area in the functional area, and the first area is connected to the first plate body through a connecting piece, the second area forms a flow channel through the limitation of the connecting piece on the functional area, that is, the flow rate of coolant in the flow channel is large, and the side of the first plate body away from the second plate body can contact the relevant part of the battery box structure, so that the battery liquid cooling plate can more quickly and efficiently take away the waste heat generated by the battery box structure, ensuring the cooling effect of the battery box structure, so as to better meet the use needs of vehicles such as high-voltage fast charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a battery liquid cooling plate according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0025] Figure 3 for Figure 1 A schematic structural diagram of the second plate body in FIG. 1 , wherein the solid arrow indicates the flow path of the coolant;

[0026] Figure 4 Another structural schematic diagram of a battery liquid cooling plate according to an embodiment of the present invention;

[0027] Figure 5 for Figure 4 Schematic diagram of the decomposition structure;

[0028] Figure 6 for Figure 4 A schematic structural diagram of the second plate body in FIG. 1 , wherein the solid arrow indicates the flow path of the coolant;

[0029] Figure 7 It is a schematic diagram of the partial structure of the battery box structure of an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. First plate body; 11. First mounting hole; 2. Second plate body; 21. First area; 211. First protruding structure; 212. Second protruding structure; 213. Third protruding structure; 214. Fourth protruding structure; 22. Second area; 23. Liquid inlet; 24. Liquid outlet; 25. Spoiler structure; 26. Second mounting hole; 3. Water nozzle; 4. Side frame. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "matched" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, it should be noted that in the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "upper", "lower", "front", "back" and other words indicating directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated in accordance with the specific directions and defined operations and methods and structures in the specification. Such directional nouns do not constitute limitations on the present invention.

[0035] Herein, a Z axis is established, wherein the positive direction of the Z axis indicates the upper direction, and the negative direction of the Z axis indicates the lower direction. It should be noted that the aforementioned Z axis is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0036] The battery liquid cooling plate usually includes a first plate body and a second plate body. The second plate body has a central functional area and an outer peripheral edge portion. The outer peripheral edge portion is connected to the frame of the battery box. The functional area has a first region and a second region. The first region is connected to the first plate body through a connecting member. The second region forms a flow channel on the functional area under the limitation of the connecting member. Cooling water or other coolant flows in the flow channel to cool the modules in the battery box. Among them, the flow channel accounts for less than 50% of the functional area, resulting in poor cooling effect.

[0037] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a battery liquid cooling plate according to an embodiment of the present invention comprises a first plate body 1 and a second plate body 2 arranged opposite to each other, the second plate body 2 having a functional area, the functional area comprising a first area 21 and a second area 22, the first area 21 being provided with a connecting piece, and the connecting piece connecting the second plate body 2 with the first plate body 1, the second area 22 forming a flow channel on the functional area through the limitation of the connecting piece, the flow channel being used for cooling liquid to flow through, and the proportion of the second area 22 in the functional area is greater than the proportion of the first area 21 in the functional area.

[0038] Here, the proportion can be understood as the volume proportion, the projection area proportion, or the contact area proportion.

[0039] Specifically, the first plate body 1 and the second plate body 2 can be square thin plates, the thickness direction of the first plate body 1 and the second plate body 2 is the direction indicated by the Z axis, that is, the up and down direction, and the first plate body 1 and the second plate body 2 are arranged opposite to each other up and down. The first plate body 1 can be a straight plate, which is convenient for fitting with the relevant part of the battery box structure, and the second plate body 2 can be arranged above the first plate body 1. The circumferential edge of the second plate body 2 is provided with a bent flange to connect with the first plate body 1. The middle part of the second plate body 2 forms a functional area. The shape of the first area 21 is not limited, and can be a straight line or a curved type. The flow channel formed by the second area 22 can be spread throughout the entire functional area, and the heat dissipation of the battery liquid cooling plate is more uniform.

[0040] In this embodiment, the connecting member may be a slender structure, and the first area 21 of the second plate body 2 is connected to the first plate body 1 through the connecting member to achieve the connection between the first plate body 1 and the second plate body 2; since the proportion of the second area 22 in the functional area is greater than that of the first area 21 in the functional area, and the first area 21 is connected to the first plate body 1 through the connecting member, the second area 22 forms a flow channel through the limitation of the connecting member in the functional area, that is, the circulation volume of the coolant in the flow channel is large, and the side of the first plate body 1 away from the second plate body 2 is in contact with the relevant part of the battery box structure, so that the battery liquid cooling plate can more quickly and efficiently take away the waste heat generated by the battery box structure, thereby ensuring the cooling effect of the battery box structure, so as to better meet the use needs of vehicles such as high-voltage fast charging.

[0041] Optionally, the connecting piece is formed by a protrusion of the first area 21, or the connecting piece is formed by a protrusion of the first plate body 1 corresponding to the first area 21 toward the second plate body 2. The connecting piece can be formed by stamping the first plate body 1 or the second plate body 2. The forming of the connecting piece is relatively simple, the strength is relatively high, and the connection of the two plates is relatively convenient.

[0042] like Figure 2-Figure 3 As shown, optionally, the connecting member includes a first protrusion structure 211 and a second protrusion structure 212, the first protrusion structure 211 extends in a serpentine shape, and the second protrusion structure 212 is at least partially inserted into the curved space of the first protrusion structure 211 to divide the curved space into two interconnected flow channels.

[0043] Specifically, there is a gap between the two ends of the first protruding structure 211 and the corresponding edges of the second plate body 2, so that the flow channels on both sides of the first protruding structure 211 can be interconnected to ensure cooling circulation; the first protruding structure 211 is arranged to bend and extend in a serpentine shape, that is, the first protruding structure 211 forms a plurality of curved spaces, and the second protruding structure 212 can be linear and can be arranged in plurality, one end of each second protruding structure 212 is respectively located in the corresponding curved space, and the other end can extend from the opening of the curved space to be connected to the corresponding edge of the second plate body 2, and a serpentine-like curved flow channel can be formed between the first protruding structure 211 and the second protruding structure 212, which is conducive to designing a flow channel with a longer path on a limited plate surface and improving the cooling effect.

[0044] like Figure 2-Figure 3As shown, optionally, the first protruding structure 211 is an axisymmetric structure, and the second plate body 2 is provided with a liquid inlet 23 and a liquid outlet 24, the liquid inlet 23 is located on one side of the middle bending portion of the first protruding structure 211, and the liquid outlet 24 is located on the other side of the middle bending portion of the first protruding structure 211; the second protruding structure 212 is inserted into the remaining curved spaces of the first protruding structure 211 except for the curved space corresponding to the middle bending portion.

[0045] Specifically, the first protruding structure 211 is an axisymmetric structure, that is, the first protruding structure 211 is formed with an odd number of bends corresponding to an odd number of curved spaces, wherein the bend located in the middle is the middle bend, and a liquid outlet 24 is provided on one side of the bend of the middle bend, and a liquid inlet 23 is provided on the other side, and the curved space corresponding to the middle bend can be used for confluence, and the second protruding structure 212 is not inserted therein, that is, the curved space in the middle is not divided into two sections of the flow channel. The liquid inlet 23 and the liquid outlet 24 are both located in the second area 22 of the second plate body 2.

[0046] In this embodiment, if Figure 3 As shown, the coolant entering the liquid inlet 23 can first flow from the middle to both sides, bypass the first protruding structure 211, and then converge from both sides toward the middle, and finally flow out from the liquid outlet 24, so that the flow path of the coolant is longer, the cooling is more uniform, and the cooling effect is further ensured.

[0047] Here, the liquid inlet 23 and the liquid outlet 24 can be provided with a water nozzle 3 respectively, so as to facilitate connection with relevant pipelines. The water nozzle 3 can be made of aluminum-manganese alloy and fixed by laser welding to meet the operation requirements of a narrow space and the sealing performance of the flow channel.

[0048] like Figure 5-Figure 6 As shown, optionally, the connecting member includes a third protruding structure 213, the two third protruding structures 213 are arranged opposite to each other, and both extend from one end of the second plate body 2 toward the direction close to the other end, a liquid inlet 23 is arranged at one end of the second plate body 2 and in the part between the two third protruding structures 213, and a liquid outlet 24 is arranged at one end of the second plate body 2 and on the side away from the two third protruding structures 213.

[0049] Specifically, the third protruding structure 213 can be a linear shape, and the second plate body 2 has a first edge and a second edge that are relatively arranged. One end of the third protruding structure 213 is connected to the first edge, and the other end of the third protruding structure 213 has a gap with the second edge, so that the flow channel between the two third protruding structures 213 and the flow channel on the side away from each other of the two third protruding structures 213 can be connected to each other to ensure the overall cooling cycle.

[0050] A liquid inlet 23 is provided between the two third protruding structures 213, that is, a liquid inlet 23 is provided in the middle of the second plate body 2, and liquid outlets 24 are provided on the sides of the two third protruding structures 213 that are away from each other, that is, on both sides of the second plate body 2, respectively. The liquid inlet 23 and the two liquid outlets 24 are both close to the first edge of the second plate body 2. The liquid inlet 23 and the liquid outlet 24 are both located in the second area 22 of the second plate body 2.

[0051] In this embodiment, if Figure 6 As shown, the coolant entering the liquid inlet 23 can flow from the first edge to the second edge along the flow channel between the two third protrusion structures 213, and then flow from the second edge to the first edge along the flow channel on the side where the two third protrusion structures 213 are away from each other, and finally flow out from the liquid outlet 24. The flow path of the coolant is long and covers the entire second plate body 2, and the cooling effect is better.

[0052] like Figure 6 As shown, optionally, the distance between the two third protrusion structures 213 gradually increases from one end close to the liquid inlet 23 toward a direction away from the liquid inlet 23. The distance between the two third protrusion structures 213 gradually increases from one end close to the first side portion toward a direction away from the second side portion, forming a trumpet shape, so as to guide the coolant entering from the liquid inlet 23 to gradually diffuse to both sides.

[0053] like Figure 6 As shown, optionally, the connecting member further comprises a fourth protruding structure 214, and a plurality of the fourth protruding structures 214 are provided on a side of each of the third protruding structures 213 away from another third protruding structure 213, and the plurality of the fourth protruding structures 214 and the third protruding structures 213 form a curved flow channel. The second plate body 2 also has a third side portion and a fourth side portion that are arranged opposite to each other, and part of the fourth protruding structures 214 are arranged between one of the third protruding structures 213 and the third side portion, and the remaining fourth protruding structures 214 are arranged between another third protruding structure 213 and the fourth side portion, and the fourth protruding structure 214 can be curved, such as an arc; by arranging the fourth protruding structure 214 on a side away from the two third protruding structures 213, the flow path of the coolant on both sides of the second plate body 2 is extended, so that the coolant is distributed more evenly and the cooling effect is better.

[0054] Optionally, the proportion of the orthographic projection area of ​​the second region 22 in the functional area is greater than the proportion of the orthographic projection area of ​​the first region 21 in the functional area, so that more coolant can flow in the second region 22 to ensure the cooling effect.

[0055] Optionally, the second region 22 accounts for more than 70% of the orthographic projection area of ​​the functional area, which can increase the cooling liquid circulation in the second region 22 as much as possible. For example, the second region 22 accounts for 70%-80% of the orthographic projection area of ​​the functional area, while ensuring the stability of the connection between the first plate body 1 and the second plate body 2, and taking into account the cooling effect.

[0056] Optionally, the first plate body 1 or the first region 21 is fixed to the connecting member by friction stir welding.

[0057] Specifically, the full English name of friction stir welding is Frittios Stir Welding, referred to as FSW, which is a solid-state welding technology mainly used to connect aluminum alloys and other metal materials. If the connecting piece is formed by the protrusion of the first area 21 of the second plate body 2, the connecting piece is fixed to the first plate body 1 by stir friction welding. If the connecting piece is formed by the protrusion of the first plate body 1 corresponding to the first area 21 toward the second plate body 2, the connecting piece is fixed to the first area 21 by stir friction welding. Compared with ordinary brazing, stir friction welding has higher welding firmness, which can reduce the proportion of the orthographic projection of the first area 21 on the functional area, such as providing the possibility of designing a slender first area 21, that is, a slender connecting piece. On the premise of ensuring the connection strength of the first plate body 1 and the second plate body 2, the proportion of the second area 22 on the functional area can be increased as much as possible to ensure the circulation of the coolant in the flow channel. In addition, no large brazing furnace is required, and no brazing flux is used. The water pump, the first plate body 1, and the second plate body 2 will not be damaged due to the residual brazing flux in the second area 22. The welding process requirements are relatively low, and it is not easy to produce defects such as pores and cracks.

[0058] Optionally, the first area 21 or the first plate body 1 has a concave structure on the side facing away from the connecting piece. If the connecting piece is formed by the protrusion of the first area 21 of the second plate body 2, the side of the first area 21 facing away from the connecting piece has a concave structure, and if the connecting piece is formed by the protrusion of the first plate body 1, the side of the first plate body 1 facing away from the connecting piece has a concave structure. The thickness of the plate body part corresponding to the concave structure is relatively thin, which is convenient for welding, and the concave structure can hold the solder, which will not cause the problem of protruding unevenness after welding, thereby ensuring the welding effect.

[0059] like Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, optionally, the second plate body 2 protrudes toward the direction close to the first plate body 1 to form a spoiler structure 25, or the first plate body 1 protrudes toward the direction close to the second plate body 2 to form a spoiler structure 25, the spoiler structure 25 is located in the flow channel, and the spoiler structure 25 is arc-convex. The spoiler structure 25 can be formed by stamping the second plate body 2 or the first plate body 1, and a plurality of spoiler structures 25 can be provided, evenly distributed in the flow channel to avoid turbulence of the coolant in the flow channel and make the flow more uniform. Setting the spoiler structure 25 in an arc-convex shape can reduce the resistance to the coolant and ensure the smoothness of the flow.

[0060] Optionally, the first plate 1 is made of one of the sixth series aluminum alloy and the seventh series aluminum alloy; and / or the second plate 2 is made of one of the third series aluminum alloy, the fourth series aluminum alloy, the fifth series aluminum alloy and the sixth series aluminum alloy. Compared with the battery liquid cooling plate using the third series aluminum alloy, the two plates of the battery liquid cooling plate of this embodiment use a higher series of aluminum alloy, so that the overall strength of the battery liquid cooling plate is higher, and it can not only be independently set on the surface of the battery box structure for cooling, but also be used as the battery bottom plate of the battery box structure, saving the cost of the battery box structure.

[0061] like Figure 2 and Figure 5 As shown, optionally, the first plate body 1 is provided with a first mounting hole 11, and the second area 22 of the second plate body 2 is provided with a second mounting hole 26, and the first mounting hole 11 and the second mounting hole 26 are interconnected and used to connect with the battery box structure or the relevant part of the electrical equipment. The first mounting holes 11 can be respectively provided on the two opposite sides of the first plate body 1, and the second mounting holes 26 are provided in a one-to-one correspondence with the first mounting holes 11. The first mounting holes 11 and the second mounting holes 26 can be bolt holes, and the bolts pass through the first mounting holes 11 and the second mounting holes 26 in sequence to install the battery liquid cooling plate on the body of the electrical equipment, or the bolts pass through the first mounting holes 11, the second mounting holes 26 and the relevant part of the battery box structure in sequence to realize the installation of the battery liquid cooling plate on the battery box structure, so as to improve the stability of the battery liquid cooling plate under load or vibration conditions.

[0062] like Figure 7 As shown, another embodiment of the present invention proposes a battery box structure, including a side frame 4 and the above-mentioned battery liquid cooling plate, wherein the battery liquid cooling plate is located at the bottom of the side frame 4, and when a battery module is placed in the side frame 4, the battery liquid cooling plate is used to support it. The side frame 4 can be formed by four surrounding side panels. The battery liquid cooling plate not only plays a role in reducing the temperature of the battery box, but also serves as a battery bottom plate, integrating multiple functions into one, thereby reducing the research and development cost of the battery.

[0063] Another embodiment of the present invention provides an electric device, including the above-mentioned battery box structure. The electric device may be a new energy vehicle. The advantages of the electric device described in this embodiment over the prior art are the same as those of the above-mentioned battery box structure, and will not be repeated.

[0064] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A battery liquid cooling plate, characterized in that: The invention comprises a first plate body (1) and a second plate body (2) which are arranged opposite to each other, wherein the second plate body (2) has a functional area, wherein the functional area comprises a first area (21) and a second area (22), wherein the first area (21) is provided with a connecting piece, and the connecting piece connects the second plate body (2) with the first plate body (1), and the second area (22) forms a flow channel on the functional area through the limitation of the connecting piece, wherein the flow channel is used for cooling liquid to flow through, and the proportion of the second area (22) in the functional area is greater than the proportion of the first area (21) in the functional area.

2. The battery liquid cooling plate according to claim 1, characterized in that: The connecting piece is formed by a protrusion of the first area (21), or the connecting piece is formed by a protrusion on the first plate body (1) corresponding to the first area (21) towards the second plate body (2).

3. The battery liquid cooling plate according to claim 1, characterized in that: The connecting member comprises a first protruding structure (211) and a second protruding structure (212); the first protruding structure (211) extends in a serpentine shape, and the second protruding structure (212) is at least partially inserted into a curved space of the first protruding structure (211) to divide the curved space into two sections of flow channels that are interconnected.

4. The battery liquid cooling plate according to claim 3, characterized in that: The first protruding structure (211) is an axisymmetric structure, and the second plate body (2) is provided with a liquid inlet (23) and a liquid outlet (24), wherein the liquid inlet (23) is located on one side of the middle bending portion of the first protruding structure (211), and the liquid outlet (24) is located on the other side of the middle bending portion of the first protruding structure (211); the second protruding structure (212) is inserted into the remaining curved spaces of the first protruding structure (211) except for the curved space corresponding to the middle bending portion.

5. The battery liquid cooling plate according to claim 1, characterized in that: The connecting member comprises a third protruding structure (213), wherein the two third protruding structures (213) are arranged opposite to each other and are both extended from one end of the second plate body (2) toward the other end, a liquid inlet (23) is arranged at one end of the second plate body (2) and in a portion between the two third protruding structures (213), and a liquid outlet (24) is arranged at one end of the second plate body (2) and on a side away from the two third protruding structures (213).

6. The battery liquid cooling plate according to claim 5, characterized in that: The distance between the two third protrusion structures (213) gradually increases from the end close to the liquid inlet (23) toward the direction away from the liquid inlet (23); and / or the connecting member further comprises a fourth protrusion structure (214), and a plurality of the fourth protrusion structures (214) are provided on a side of each third protrusion structure (213) away from another third protrusion structure (213), and the plurality of the fourth protrusion structures (214) and the third protrusion structures (213) form a curved flow channel.

7. The battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The proportion of the orthographic projection area of ​​the second region (22) in the functional area is greater than the proportion of the orthographic projection area of ​​the first region (21) in the functional area.

8. The battery liquid cooling plate according to claim 7, characterized in that: The second region (22) accounts for more than 70% of the orthographic projection area of ​​the functional area.

9. The battery liquid cooling plate according to claim 2, characterized in that: The first plate body (1) or the first region (21) is fixed to the connecting piece by means of friction stir welding.

10. The battery liquid cooling plate according to claim 9, characterized in that: The first plate body (1) or the first region (21) has a concave structure on a side facing away from the connecting member.

11. The battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The second plate body (2) protrudes in a direction close to the first plate body (1) to form a spoiler structure (25), or the first plate body (1) protrudes in a direction close to the second plate body (2) to form a spoiler structure (25), the spoiler structure (25) is located in the flow channel, and the spoiler structure (25) is arc-convex.

12. The battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The first plate (1) is made of one of a sixth series aluminum alloy and a seventh series aluminum alloy; And / or, the second plate body (2) is made of one of a third-series aluminum alloy, a fourth-series aluminum alloy, a fifth-series aluminum alloy and a sixth-series aluminum alloy.

13. The battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The first plate body (1) is provided with a first mounting hole (11), and the second area (22) of the second plate body (2) is provided with a second mounting hole (26); the first mounting hole (11) and the second mounting hole (26) are interconnected and are used to connect with a battery box structure or a related part of an electrical device.

14. A battery box structure, characterized in that: It comprises a side frame (4) and a battery liquid cooling plate as claimed in any one of claims 1 to 13, wherein the battery liquid cooling plate is located at the bottom of the side frame (4), and when a battery module is placed in the side frame (4), the battery liquid cooling plate is used to support the battery module.

15. An electrical equipment, characterized in that: Comprising the battery box structure as claimed in claim 14.

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