Battery liquid cooling plate, battery box structure and electric equipment

Abstract

The utility model provides a battery liquid cooling plate, battery box structure and electric equipment, relate to the battery field, said battery liquid cooling plate includes first plate body and second plate body that sets up oppositely, the second plate body has functional area, the functional area includes first area and second area, the first area is equipped with connecting piece, and the second area is equipped with 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 utility model relates to the field of battery, specifically, relate to a battery liquid cooling plate, battery box structure and electric equipment. BACKGROUND

[0002] Power battery is an important part of new energy vehicles, and its service life and use safety have important influence on vehicle performance. A large amount of heat is generated in the process of using power battery, in order to avoid failure due to high temperature, liquid cooling plate is installed on the surface of power battery to take away the waste heat generated, which is a common way to solve the high temperature of power battery.

[0003] The existing battery liquid cooling plate usually includes a first plate body and a second plate body, an elongated flow channel is formed on the second plate body by stamping, the flow channel is used for circulating cooling liquid, the first plate body covers the second plate body, the first plate body directly contacts with the surface of the power battery to absorb the heat generated, and the heat is transferred to the cooling liquid in the flow channel, the cooling liquid circulates and takes away the heat, so that the power battery is cooled. Since high-voltage fast charging and other models will generate a lot of heat during charging, and the flow passage of the existing battery liquid cooling plate has small flow area and low heat exchange efficiency, the cooling effect is poor, and it is usually difficult to meet the use needs of high-voltage fast charging and other models. SUMMARY

[0004] The utility model aims at solving the technical problem of low heat exchange efficiency and poor cooling effect of the existing battery liquid cooling plate.

[0005] In the first aspect, the utility model provides a battery liquid cooling plate, including first plate body and second plate body who sets up oppositely, the second plate body has functional area, the functional area includes first area and second area, the first area is equipped with connecting piece, and the connecting piece connects the second plate body with the first plate body, the second area forms flow channel on the functional area through the limitation of the connecting piece, the flow channel is used for cooling liquid to flow, 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 piece is formed by the first area protruding, or the connecting piece is formed by the first area protruding from the first plate body to the second plate body.

[0007] Optionally, the connecting piece includes first protruding structure and second protruding structure, the first protruding structure extends in a serpentine shape, and the second protruding structure is at least partially inserted into the bending space of the first protruding structure to divide the bending space into two flow channels that are in communication with each other.

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

[0009] Optionally, the connecting piece comprises third protruding structures, the two third protruding structures are oppositely arranged and are arranged by extending from one end of the second plate body towards the direction close to the other end, the part of the one end of the second plate body between the two third protruding structures is provided with a liquid inlet, and the one end of the second plate body and the sides of the two third protruding structures away from each other are respectively provided with liquid outlets.

[0010] Optionally, the distance between the two third protruding structures gradually increases from the end close to the liquid inlet towards the direction away from the liquid inlet; and / or, the connecting piece further comprises fourth protruding structures, the side of each third protruding structure away from the other third protruding structure is provided with a plurality of fourth protruding structures, and the plurality of fourth protruding structures and the third protruding structures enclose a curved flow channel.

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

[0012] Optionally, the area ratio of the second region in the orthographic projection area of the functional area is greater than the area ratio of the first region in the orthographic projection area of the functional area.

[0013] Optionally, the first plate body or the first region and the connecting piece are welded and fixed by friction stir welding.

[0014] Optionally, the first region or the first plate body is concave on the side away from the connecting piece.

[0015] Optionally, the second plate body protrudes towards the direction close to the first plate body to form a spoiler structure, or the first plate body protrudes towards the 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 body is made of one of six-system aluminum alloy and seven-system aluminum alloy.

[0017] Optionally, the second plate body is made of one of three-system aluminum alloy, four-system aluminum alloy, five-system aluminum alloy and six-system aluminum alloy.

[0018] Optionally, the first plate body is provided with a first mounting hole, and the second region of the second plate body is provided with a second mounting hole, the first mounting hole and the second mounting hole are in communication with each other and are used to be connected with the battery box structure or the relevant part of the electric device.

[0019] In a second aspect, the utility model also provides a battery box structure, including side frame and above-mentioned battery liquid cooling plate, battery liquid cooling plate is located the bottom of side frame, when the battery module is put into in side frame, through battery liquid cooling plate bears.

[0020] In a third aspect, the utility model provides an electric device, including above-mentioned battery box structure.

[0021] The battery liquid cooling plate, the battery box structure and the electric device have at least the following advantages compared with the prior art.

[0022] The first region of the second plate body is connected with the first plate body through the connecting piece to realize the connection between the first plate body and the second plate body; since the proportion of the second region on the functional area is greater than the proportion of the first region on the functional area, and the first region is connected with the first plate body through the connecting piece, and the second region forms the flow channel through the limitation of the connecting piece on the functional area, that is, the flow capacity of the cooling liquid in the flow channel is larger, and the side of the first plate body away from the second plate body can be 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, ensure the cooling effect of the battery box structure, and better meet the use needs of high-voltage fast-charging vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the battery liquid cooling plate of the utility model embodiment;

[0024] Figure 2 It is an exploded structural schematic view of Figure 1 ; and

[0025] Figure 3 It is a structural schematic view of the second plate body in Figure 1 , wherein the solid line arrow represents the flow path of the cooling liquid;

[0026] Figure 4 It is another structural schematic view of the battery liquid cooling plate of the utility model embodiment;

[0027] Figure 5 It is an exploded structural schematic view of Figure 4 ; and

[0028] Figure 6 It is a structural schematic view of the second plate body in Figure 4 , wherein the solid line arrow represents the flow path of the cooling liquid;

[0029] Figure 7 Figure 1 is a partial structure schematic view of a battery box structure according to an embodiment of the present application.

[0030] Reference signs:

[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, turbulence structure; 26, second mounting hole; 3, water nozzle; 4, side frame. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0033] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "cooperating" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0034] In addition, it should be noted that in the description of the present application, the terms such as "upper", "lower", "front", "rear" and other words indicating the position of the terms in the embodiments are only for the purpose of simplifying the description of the position relationship based on the drawings of the specification, and do not represent the elements and devices indicated by the specific position and the operation and method, structure defined in the specification. The operation of such positional terms does not constitute a limitation on the present application.

[0035] In this paper, the Z-axis is established, wherein the positive direction of the Z-axis represents the upper, and the negative direction of the Z-axis represents the lower. And it should be noted that the meaning of the aforementioned Z-axis is only for the purpose of describing the present application and simplifying the description, and is not indicative or suggestive of the device or element indicated by the specific position, structure and operation, therefore it cannot be understood as a limitation on the present application.

[0036] The battery liquid cooling plate generally comprises a first plate body and a second plate body, the second plate body has a functional area in a middle part and an outer peripheral edge part, the outer peripheral edge part is connected with a frame of a battery box, the functional area has a first area and a second area, the first area is connected with the first plate body through a connecting piece, and the second area forms a flow channel on the functional area under the limitation of the connecting piece, cooling liquid such as cooling water flows in the flow channel to cool the module in the battery box, wherein the proportion of the flow channel in the functional area is generally less than 50%, so that the cooling effect is poor.

[0037] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 indicate that the battery liquid cooling plate of the utility model embodiment comprises a first plate body 1 and a second plate body 2 arranged oppositely, the second plate body 2 has a functional area, the functional area comprises a first area 21 and a second area 22, 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, the second area 22 forms a flow channel on the functional area under the limitation of the connecting piece, 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.

[0038] Wherein, the proportion can be understood as the volume proportion or 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-down direction, and the first plate body 1 and the second plate body 2 are arranged oppositely in the up-down direction. The first plate body 1 can be a flat plate, which is convenient to fit with the related parts of the battery box structure, 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 bending and turning edge to be connected with the first plate body 1, the middle part of the second plate body 2 forms the functional area, the shape of the first area 21 is not limited, which can be linear or curved, the flow channel formed by the second area 22 can be distributed throughout the functional area, and the heat dissipation of the battery liquid cooling plate is more uniform.

[0040] In the embodiment, the connecting piece can be in an elongated structure, the first region 21 of the second plate body 2 is connected with the first plate body 1 through the connecting piece to realize the connection between the first plate body 1 and the second plate body 2; since the proportion of the second region 22 on the functional area is greater than that of the first region 21 on the functional area, and the first region 21 is connected with the first plate body 1 through the connecting piece, the second region 22 forms a flow channel on the functional area through the connecting piece, that is, the flow capacity of the cooling liquid 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 related 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, ensure the cooling effect of the battery box structure, and better meet the use needs of high-voltage fast-charging vehicles and the like.

[0041] Optionally, the connecting piece is formed by the first region 21 protruding, or the connecting piece is formed by the first plate body 1 protruding in the direction of the second plate body 2 at a position corresponding to the first region 21. The connecting piece can be stamped from 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 plate bodies is relatively convenient.

[0042] As shown in Figures 2-3 Optionally, the connecting piece includes 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 the bending space of the first protruding structure 211 to divide the bending space into two flow channels that are in communication with each other.

[0043] Specifically, the first protruding structure 211 has a gap between both ends and the corresponding edge of the second plate body 2, so that the flow channels on both sides of the first protruding structure 211 can be in communication with each other to ensure cooling circulation; the first protruding structure 211 extends in a serpentine shape, that is, the first protruding structure 211 forms a plurality of bending spaces, and the second protruding structure 212 can be linear and can be provided in multiple numbers, one end of each second protruding structure 212 is located in a corresponding bending space, and the other end can extend out of the opening of the bending space to be connected with the corresponding edge of the second plate body 2, and a bending flow channel similar to a snake shape can be formed between the first protruding structure 211 and the second protruding structure 212, which is beneficial to designing a flow channel with a long path on a limited plate surface and improving the cooling effect.

[0044] As shown in Figures 2-3As shown, the first protruding structure 211 is an axisymmetric structure, 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 part of the first protruding structure 211, and the liquid outlet 24 is located on the other side of the middle bending part of the first protruding structure 211; the remaining bending spaces of the first protruding structure 211 except the bending space corresponding to the middle bending part are inserted with the second protruding structure 212.

[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 bending parts, corresponding to an odd number of bending spaces, wherein the middle bending part is the middle bending part, the liquid outlet 24 is arranged on one side of the middle bending part, and the liquid inlet 23 is arranged on the other side of the middle bending part, and the bending space corresponding to the middle bending part can be used for confluence, and the second protruding structure 212 is not inserted therein, that is, the middle bending space is not divided into two flow channels. The liquid inlet 23 and the liquid outlet 24 are located in the second region 22 of the second plate body 2.

[0046] In this embodiment, as shown in the figure, Figure 3 The cooling liquid 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 to the middle, and finally flow out from the liquid outlet 24, so that the flow path of the cooling liquid is longer, the cooling is more uniform, and the cooling effect is further ensured.

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

[0048] As shown in the figure, Figures 5-6 Optionally, the connecting piece includes a third protruding structure 213, the two third protruding structures 213 are oppositely arranged and extend from one end of the second plate body 2 to the direction close to the other end, the liquid inlet 23 is arranged on one end of the second plate body 2 between the two third protruding structures 213, and the liquid outlet 24 is arranged on one end of the second plate body 2 on the side away from each other of the two third protruding structures 213.

[0049] Specifically, the third protruding structure 213 can be linear, the second plate body 2 has oppositely arranged first and second edge portions, one end of the third protruding structure 213 is connected with the first edge portion, and the other end of the third protruding structure 213 has a gap with the second edge portion, so that the flow channels between the two third protruding structures 213 and the flow channels on the sides away from each other of the two third protruding structures 213 can be connected with each other, ensuring the overall cooling circulation.

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

[0051] In the embodiment, as shown in the figure, Figure 6 the cooling liquid entering the liquid inlet 23 can flow from the first edge to the second edge along the flow channel between the two third protruding structures 213, and then flow from the second edge to the first edge along the flow channel on the side of the two third protruding structures 213 away from each other, and finally flow out of the liquid outlet 24. The flow path of the cooling liquid is long, and covers the entire second plate body 2, so the cooling effect is good.

[0052] As shown in the figure, Figure 6 Optionally, the distance between the two third protruding structures 213 gradually increases from the end close to the liquid inlet 23 to the direction away from the liquid inlet 23. The distance between the two third protruding structures 213 gradually increases from the end close to the first edge to the direction away from the second edge, forming a horn shape, so as to guide the cooling liquid entering the liquid inlet 23 to gradually spread to both sides.

[0053] As shown in the figure, Figure 6 Optionally, the connecting piece further comprises a fourth protruding structure 214, and each third protruding structure 213 is provided with a plurality of fourth protruding structures 214 on the side away from another third protruding structure 213, and the plurality of fourth protruding structures 214 and the third protruding structure 213 form a curved flow channel. The second plate body 2 further has a third edge and a fourth edge arranged oppositely, and part of the fourth protruding structures 214 are arranged between one of the third protruding structures 213 and the third edge, and the rest of the fourth protruding structures 214 are arranged between the other third protruding structure 213 and the fourth edge. The fourth protruding structure 214 can be curved, such as arc-shaped. By arranging the fourth protruding structure 214 on the side of the two third protruding structures 213 away from each other, the flow path of the cooling liquid on the two sides of the second plate body 2 is prolonged, so that the cooling liquid is more evenly distributed, and the cooling effect is better.

[0054] Optionally, the proportion of the area of the orthographic projection of the second area 22 in the functional area is greater than the proportion of the area of the orthographic projection of the first area 21 in the functional area. So that more cooling liquid can flow in the second area 22, and the cooling effect is ensured.

[0055] Optionally, the second area 22 has a positive projection area ratio of 70% or more in the functional area, so as to increase the flow of the cooling liquid in the second area 22 as much as possible, such as the positive projection area ratio of the second area 22 in the functional area is 70%-80%, which can ensure the stability of the connection between the first plate body 1 and the second plate body 2 and take into account the cooling effect.

[0056] Optionally, the first plate body 1 or the first area 21 is welded and fixed with the connecting piece by friction stir welding.

[0057] Specifically, the full name of friction stir welding in English is Frictio Stir Welding, which is abbreviated as FSW. It is a solid-state welding technology mainly used for connecting aluminum alloy and other metal materials. If the connecting piece is formed by the first area 21 of the second plate body 2 protruding, the connecting piece is welded and fixed with the first plate body 1 by friction stir welding. If the connecting piece is formed by the first plate body 1 protruding towards the second plate body 2 corresponding to the first area 21, the connecting piece is welded and fixed with the first area 21 by friction stir welding. Compared with ordinary brazing, the welding is more firm. In order to reduce the positive projection ratio of the first area 21 in the functional area, such as designing an elongated first area 21, i.e. an elongated connecting piece, it is possible to increase the ratio of the second area 22 in the functional area as much as possible while ensuring the connection strength of the first plate body 1 and the second plate body 2, and ensuring the flow of the cooling liquid in the flow channel. In addition, there is no need for a large brazing furnace, no flux is used, and no damage to the water pump, the first plate body 1 and the second plate body 2 caused by the residual flux in the second area 22. The welding process requires lower requirements and is not easy to produce defects such as pores and cracks.

[0058] Optionally, the first area 21 or the first plate body 1 is recessed on the side away from the connecting piece. If the connecting piece is formed by the first area 21 of the second plate body 2 protruding, the side of the first area 21 away from the connecting piece is recessed. If the connecting piece is formed by the first plate body 1 protruding, the side of the first plate body 1 away from the connecting piece is recessed. The thickness of the plate body part corresponding to the recessed structure is thinner, which is convenient for welding, and the recessed structure can hold the welding material, which will not cause the problem of uneven protrusion after welding, and ensure the welding effect.

[0059] As Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, optionally, the second plate body 2 is convex towards the first plate body 1 to form a spoiler structure 25, or the first plate body 1 is convex towards 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 multiple spoiler structures 25 can be uniformly distributed in the flow channel to avoid turbulence of the cooling liquid in the flow channel and make the flow more uniform. The spoiler structure 25 is arranged in an arc convex shape to reduce the resistance to the cooling liquid and ensure the smoothness of the flow.

[0060] Optionally, the first plate body 1 is made of one of six series aluminum alloy and seven series aluminum alloy; and / or, the second plate body 2 is made of one of three series aluminum alloy, four series aluminum alloy, five series aluminum alloy and six series aluminum alloy. Compared with the battery liquid cooling plate made of three series aluminum alloy, the two plate bodies of the battery liquid cooling plate of the embodiment are made of higher series aluminum alloy, so that the overall strength of the battery liquid cooling plate is higher. The battery liquid cooling plate can not only be independently arranged on the surface of the battery box structure for cooling, but also be used as a battery bottom plate of the battery box structure, thereby saving the cost of the battery box structure.

[0061] As shown in Figure 2 and Figure 5 Optionally, the first plate body 1 is provided with a first mounting hole 11, and the second region 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 in communication with each other and are used to connect the battery box structure or the related part of the electric equipment. The two opposite edge portions of the first plate body 1 can be respectively provided with the first mounting hole 11, and the second mounting hole 26 is correspondingly arranged with the first mounting hole 11, and the first mounting hole 11 and the second mounting hole 26 can be bolt holes. The bolt passes through the first mounting hole 11 and the second mounting hole 26 in sequence to install the battery liquid cooling plate on the body of the electric equipment, or the bolt passes through the first mounting hole 11, the second mounting hole 26 and the related part of the battery box structure in sequence to realize the installation of the battery liquid cooling plate on the battery box structure, thereby improving the stability of the battery liquid cooling plate under the load or vibration working condition.

[0062] As shown in Figure 7 Another embodiment of the utility model provides a battery box structure, which comprises a side frame 4 and the above-mentioned battery liquid cooling plate, and the battery liquid cooling plate is located at the bottom of the side frame 4. When the battery module is placed in the side frame 4, the battery liquid cooling plate is used for bearing. The side frame 4 can be formed by four side plates arranged around. The battery liquid cooling plate not only reduces the temperature of the battery box, but also is used as a battery bottom plate, integrates multiple functions, and reduces the research and development cost of the battery.

[0063] The utility model discloses still one embodiment proposes a kind of electric equipment, including above-mentioned battery box structure.Electric equipment can be new energy automobile.The electric equipment described in this embodiment has the same advantage with above-mentioned battery box structure compared to prior art, and will not be repeated to explain.

[0064] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall within the protection scope of the utility model.

Claims

1. A battery liquid cold plate characterized by, The application relates to a plate body, which comprises oppositely arranged first and second plate bodies (1 and 2), wherein the second plate body (2) has a functional area, the functional area comprises a first area (21) and a second area (22), the first area (21) is provided with a connecting piece, the connecting piece connects the second plate body (2) with the first plate body (1), the second area (22) forms a flow channel on the functional area through the connecting piece, the flow channel is used for flowing cooling liquid, 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 cold plate of claim 1, wherein, The connecting piece is formed by protruding from the first area (21), or the connecting piece is formed by protruding from the first plate body (1) to the second plate body (2) at a position corresponding to the first area (21).

3. The battery liquid cold plate of claim 1, wherein, The connecting piece comprises first and second protruding structures (211 and 212), the first protruding structure (211) extends in a serpentine shape, and the second protruding structure (212) is at least partially inserted into the bending space of the first protruding structure (211) to divide the bending space into two mutually-communicating flow channels.

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

5. The battery liquid cold plate of claim 1, wherein, The connecting piece comprises third protruding structures (213), two third protruding structures (213) are oppositely arranged and extend from one end of the second plate body (2) to the direction close to the other end, the part of the second plate body (2) between the two third protruding structures (213) is provided with the inlet (23), and the side of the other end of the second plate body (2) away from the other third protruding structure (213) is provided with the outlet (24).

6. The battery liquid cold plate of claim 5, wherein, The distance between the two third protruding structures (213) gradually increases from the end close to the inlet (23) to the direction away from the inlet (23); and / or the connecting piece further comprises fourth protruding structures (214), each third protruding structure (213) is provided with a plurality of fourth protruding structures (214) on the side away from the other third protruding structure (213), and the plurality of fourth protruding structures (214) and the third protruding structure (213) enclose a curved flow channel.

7. The battery liquid cold plate of any one of claims 1-6, wherein, The proportion of the area of the second area (22) in the functional area is greater than the proportion of the area of the first area (21) in the functional area.

8. The battery liquid cold plate of claim 7, wherein, The proportion of the area of the second area (22) in the functional area is greater than 70%.

9. The battery liquid cold plate of claim 2, wherein, The first plate body (1) or the first area (21) and the connecting piece are welded and fixed by friction stir welding.

10. The battery liquid cold plate of claim 9, wherein, The first plate body (1) or the first region (21) is concave on the side away from the connecting member.

11. The battery liquid cold plate of any one of claims 1-6, wherein, The second plate body (2) is convex toward the first plate body (1) to form a spoiler structure (25), or the first plate body (1) is convex toward 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 cold plate of any one of claims 1-6, wherein, The first plate body (1) is made of one of six series aluminum alloy and seven series aluminum alloy. And / or, the second plate body (2) is made of one of three series aluminum alloy, four series aluminum alloy, five series aluminum alloy and six series aluminum alloy.

13. The battery liquid cold plate of any one of claims 1-6, wherein, The first plate body (1) is provided with a first mounting hole (11), and the second region (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 in communication and used for connecting with the battery box structure or the related part of the electric equipment.

14. A battery case structure characterized by comprising: The battery liquid cooling plate according to any one of claims 1-13 is located at the bottom of the side frame (4), and when the battery module is placed in the side frame (4), the battery liquid cooling plate is used for bearing.

15. An electrical device, characterized by The battery box structure according to claim 14 is provided.

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