Battery liquid cooling assembly

Abstract

The utility model provides a kind of battery liquid cooling assembly, for the heat exchange of battery pack, including first liquid cooling plate, it includes heat exchange surface and capillary, capillary is around and located between two heat exchange surfaces in first liquid cooling plate, heat exchange surface is attached to connect with battery pack, capillary is equipped with first liquid inlet and first liquid outlet of through heat exchange surface;And connecting pipe, it includes tube body, the first liquid inlet and the first liquid outlet of adjacent two first liquid cooling plates are respectively communicated by connecting pipe, cooling liquid flows between connecting pipe and capillary;First liquid cooling plate is arranged in the upper and lower sides of battery pack;First liquid inlet and first liquid outlet are located in the same side of first liquid cooling plate;The inner diameter of tube body increases with the temperature rise of cooling liquid, the inner diameter of tube body decreases with the temperature drop of cooling liquid.Simultaneously with improving heat exchange efficiency and liquid cooling system stability, reduce pipeline connection, reduce the risk of leakage and overall cost, also improve the installation efficiency of liquid cooling pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage battery temperature control technology, specifically relating to a battery liquid cooling component. Background Technology

[0002] In the field of new energy, batteries serve as the primary energy storage medium in all aspects. During battery use, effectively controlling battery temperature is a core issue, as the quality of temperature control directly impacts battery performance, lifespan, and safety.

[0003] In existing technologies, batteries are manufactured into standard battery pack units as needed, and liquid cooling plates are attached to the surface of each battery pack unit. By having coolant flow through capillary channels within the liquid cooling plates, the heat generated or required by the battery pack unit is replaced, thereby achieving basic temperature control of the battery pack unit.

[0004] However, the existing first liquid cooling plate and temperature control system use a traditional multi-stage connection method, which involves multiple stages of piping connecting them to meet the heat exchange needs of dozens of battery pack units. But as the number of battery pack units increases, this piping actually occupies more space, affecting the energy density of each battery pack unit. Secondly, installation and maintenance costs increase exponentially, and the increased number of joints and pipes actually increases the risk of coolant leakage. Furthermore, during heat exchange, the coolant expands and contracts due to changes in ambient temperature and charging / discharging power. This causes fluctuations in coolant pressure and flow during transmission, ultimately affecting the heat exchange efficiency of the first liquid cooling plate. Utility Model Content

[0005] To address the shortcomings of the prior art, this invention provides a battery liquid cooling assembly. The first liquid inlet and the first liquid outlet are located on the same side of the first liquid cooling plate. Adjacent first liquid inlets and outlets are connected by connecting pipes, reducing the piping of the liquid cooling system, lowering costs, and improving installation efficiency. Furthermore, the inner diameter of the pipe increases or decreases accordingly with the temperature of the coolant, thus improving the stability and heat exchange efficiency of the liquid cooling system, resulting in highly efficient heat exchange and precise temperature control.

[0006] The technical effect to be achieved by this utility model is realized through the following technical solution:

[0007] This utility model provides a battery liquid cooling assembly for heat exchange in a battery pack, comprising:

[0008] A first liquid-cooled plate includes a heat exchange surface and a capillary tube. The capillary tube is wound around the first liquid-cooled plate and located between two of the heat exchange surfaces. The heat exchange surfaces are in contact with the battery pack. The capillary tube has a first liquid inlet and a first liquid outlet penetrating the heat exchange surfaces.

[0009] The connecting pipe includes a pipe body, and the first liquid inlet and first liquid outlet of two adjacent first liquid cooling plates are respectively connected through the connecting pipe, and the coolant flows between the connecting pipe and the capillary tube;

[0010] The first liquid cooling plate is disposed on the upper and lower sides of the battery pack; the first liquid inlet and the first liquid outlet are located on the same side of the first liquid cooling plate; the inner diameter of the tube increases as the temperature of the coolant increases, and the inner diameter of the tube decreases as the temperature of the coolant decreases.

[0011] In some implementations, the first liquid cooling plate includes a first connector disposed on the first liquid inlet and the first liquid outlet. The connecting pipe includes a second connector that matches the first connector and is disposed at both ends of the pipe body. When adjacent first liquid inlets and first liquid outlets are connected, the first connector and the second connector engage with each other. The first connector and the second connector are quick-connect connectors.

[0012] In some implementations, after being disconnected from the second connector, the first connector seals the corresponding first inlet or first outlet.

[0013] In some implementations, the tube body includes a cavity, a deformation layer, and a support layer arranged sequentially from the inside out. When the coolant temperature decreases, the shape and position of the support layer remain basically unchanged, while the deformation layer deforms, causing the inner diameter of the tube body to decrease.

[0014] In some implementations, the deformable layer is a volumetrically variable elastomer and is bonded and fixed to the support layer.

[0015] In some implementations, the deformation layer includes an elastic element and a temperature-sensitive element wrapped by the elastic element, wherein the temperature-sensitive element is a shape memory metal.

[0016] In some implementations, a main liquid inlet pipe and a main liquid outlet pipe are included, which are arranged in pairs and located on the side of the first liquid cooling plate that is not attached to the battery pack; the first liquid inlet and the first liquid outlet on the first liquid cooling plate are connected to the main liquid inlet pipe and the main liquid outlet pipe respectively through the connecting pipe.

[0017] In some implementations, the main inlet pipe and the main outlet pipe are further provided with valves at their connection points with the connecting pipe, and the valves control the flow rate and on / off state of the coolant.

[0018] Furthermore, it also includes a second liquid cooling plate, which is perpendicular to the first liquid cooling plate and attached to the battery pack; the second liquid cooling plate includes a second liquid inlet and a second liquid outlet, and adjacent second liquid cooling plates are connected by the connecting pipe.

[0019] Furthermore, on the first liquid cooling plate opposite to the main liquid inlet pipe and the main liquid outlet pipe, the first liquid inlet and the first liquid outlet are respectively connected to the adjacent second liquid inlet and the second liquid outlet through the connecting pipe.

[0020] In summary, this utility model has at least the following advantages:

[0021] 1. The battery liquid cooling assembly provided by this utility model places the first liquid inlet and the first liquid outlet on the same side of the first liquid cooling plate, and then connects adjacent first liquid inlets and first liquid outlets through connecting pipes, which greatly reduces the number of pipe connections around the first liquid cooling plate. While ensuring the heat exchange effect, it reduces the risk of pipe leakage and also improves the installation efficiency of the battery liquid cooling system.

[0022] 2. The battery liquid cooling assembly provided by this utility model allows the inner diameter of the tubes to increase or decrease with the rise and fall of the coolant temperature, thus adapting to the thermal expansion and contraction of the coolant due to temperature changes. This reduces pressure and flow fluctuations of the coolant within the tubes, ensuring the stability of the entire liquid cooling system. With fewer pipes, the flow resistance of the coolant within the tubes is also reduced, resulting in higher overall heat exchange efficiency of the liquid cooling system and more precise temperature difference control of the battery pack.

[0023] 3. The battery liquid cooling component provided by this utility model can ensure heat exchange effect while occupying less equipment space and having a lower overall cost. Attached Figure Description

[0024] Figure 1 This is an axonometric view of the battery liquid cooling assembly in Example 1.

[0025] Figure 2 for Figure 1 A magnified view of point A in the middle.

[0026] Figure 3 for Figure 2 A cross-sectional view of the first liquid outlet at point B in the middle.

[0027] Figure 4 This is a cross-sectional view of the first connector and the second connector before and after connection in Example 1.

[0028] Figure 5 This is a cross-sectional view of the interior of the tube in Example 1.

[0029] Figure 6 This is a cross-sectional view of the tube body equipped with an elastic element and a temperature sensing element in Example 1.

[0030] Figure 7 This is an axonometric view of the battery liquid cooling assembly in Example 2.

[0031] Figure 8 for Figure 7 A magnified view at point C.

[0032] Figure 9 This is an axonometric view of the battery liquid cooling assembly in Example 3.

[0033] Marked in the image:

[0034] 100. Battery liquid cooling assembly;

[0035] 200. Battery pack; 201. External terminal

[0036] 1. First liquid cooling plate; 11. Heat exchange surface; 12. Capillary tube; 121. First liquid inlet; 122. First liquid outlet; 13. First connector; 131. Sealing shaft core; 132. Spring.

[0037] 2. Connecting pipe; 21. Pipe body; 211. Pipe cavity; 212. Deformation layer; 2121. Elastic element; 2122. Temperature sensing element; 213. Support layer; 22. Second connector.

[0038] 3. Coolant; 4. Main inlet pipe; 5. Main outlet pipe; 6. Valves;

[0039] 7. Second liquid cooling plate,

[0040] 71. Second liquid inlet,

[0041] 72. Second liquid outlet;

[0042] X represents the horizontal direction; Y represents the vertical direction; and Z represents the vertical direction. Detailed Implementation

[0043] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0044] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0047] For ease of understanding, it should be noted that the X-axis in the graph represents the horizontal direction, the Y-axis represents the vertical direction, and the Z-axis represents the vertical direction.

[0048] Example 1:

[0049] Please see Figures 1-3 This embodiment provides a battery liquid cooling assembly 100, which is mainly used for heat exchange of battery packs 200 in equipment such as new energy vehicles and energy storage power stations. It includes a first liquid cooling plate 1, a connecting pipe 2 and a coolant 3.

[0050] Specifically, the first liquid cooling plate 1 has a flat plate structure, including heat exchange surfaces 11 and capillary tubes 12. The heat exchange surfaces 11 are two large-area surfaces of the first liquid cooling plate 1, while the capillary tubes 12 are wound inside the first liquid cooling plate 1 and located between the two heat exchange surfaces 11. The heat exchange surfaces 11 are in close contact with the battery pack 200 to ensure that the heat of the battery pack 200 can be fully exchanged. The capillary tubes 12 are provided with a first liquid inlet 121 and a first liquid outlet 122 penetrating through the heat exchange surfaces 11. Figure 3 As shown, in this embodiment, the first liquid inlet 121 and the first liquid outlet 122 penetrate the two heat exchange surfaces 11 to form a channel for the flow of coolant 3.

[0051] The connecting pipe 2 includes a pipe body 21. The first liquid inlet 121 and the first liquid outlet 122 of two adjacent first liquid cooling plates 1 are connected through the connecting pipe 2, and the coolant 3 flows between the connecting pipe 2 and the capillary tube 12.

[0052] During installation, the first liquid cooling plate 1 is positioned on the upper and lower sides of the battery pack 200 along the height direction Z, enabling the battery pack 200 to achieve better heat exchange and improve its heat exchange efficiency. The first liquid inlet 121 and the first liquid outlet 122 are located on the same side of the first liquid cooling plate 1. In this embodiment, as... Figure 1 As shown, the first liquid inlet 121 and the first liquid outlet 122 are both located on one side of the longitudinal Y direction.

[0053] By connecting pipe 2, the first liquid inlet 121 and first liquid outlet 122 of two adjacent first liquid cooling plates 1 are connected, forming a series connection between the first liquid inlet 121 and first liquid outlet 122 of multiple first liquid cooling plates 1. Compared with the existing method of directly connecting each first liquid inlet 121 and first liquid outlet 122 to the pipeline through secondary or tertiary pipelines, the number of pipelines is reduced, and the risk of leakage after connection is reduced. Furthermore, due to the reduction in the number of connecting pipes, the cost of the entire liquid cooling system is reduced, and the installation efficiency is greatly improved.

[0054] Furthermore, during the heat exchange process of the entire liquid cooling system, the coolant 3 will also expand and contract thermally with the temperature change after heat exchange. That is, when the temperature of the coolant 3 rises, the liquid molecules become more active, and its volume increases accordingly. Conversely, when the temperature drops, its volume decreases accordingly. In the liquid cooling system, the coolant 3 is located in a closed pipeline. Due to the difference in thermal deformation between the pipeline and the coolant 3, the pipeline is subjected to the deformation pressure of the coolant 3, causing the inner wall of the pipeline to be under stress, which affects the service life of the pipeline.

[0055] Furthermore, since the overall volume of the liquid cooling system piping remains essentially constant, the actual heat capacity of the coolant 3 within the piping changes due to thermal expansion and contraction, thus affecting its heat exchange capacity. For example, as the temperature of the coolant 3 increases, the activity of liquid molecules increases, the coolant 3 becomes thinner, the total heat capacity of the liquid cooling system piping decreases, and the cooling efficiency for the battery pack 200 decreases. Conversely, at lower temperatures, the coolant 3 becomes thicker, its total volume decreases, and its flow resistance increases, reducing its heating efficiency for the battery pack 200. This necessitates continuous adjustments to components such as the compressor pump in the liquid cooling system according to heat exchange requirements, resulting in large fluctuations in pressure and flow rate and relatively poor system stability.

[0056] Therefore, in this embodiment, the inner diameter of the tube 21 increases as the temperature of the coolant 3 rises, and decreases as the temperature of the coolant 3 falls. This causes the total volume inside the liquid cooling system piping to change with the coolant 3, but the total heat capacity remains constant, effectively ensuring the overall cooling or heating efficiency. For the liquid cooling system, the output pressure and flow fluctuations are reduced, resulting in better stability of the entire liquid cooling system. Of course, combined with the above piping connection method, the flow resistance of the coolant 3 inside the pipes of the liquid cooling system will also be reduced accordingly, improving heat exchange efficiency and also improving the temperature control accuracy of the battery pack 200.

[0057] In addition, when the coolant 3 flows back, the inner diameter of the pipe body 21 increases, and the coolant 3, which expands due to heat, is closer to the outside. It can obtain a certain amount of heat dissipation in the connecting pipe 2, thus accelerating heat dissipation.

[0058] In some embodiments, the first liquid cooling plate 1 includes a first connector 13, which is disposed on a first liquid inlet 121 and a first liquid outlet 122. The connecting pipe 2 includes a second connector 22 that matches the first connector 13, which is disposed at both ends of the pipe body 21. When adjacent first liquid inlets 121 and first liquid outlets 122 are connected, the first connector 13 and the second connector 22 engage and snap together. In this embodiment, since the first liquid inlet 121 and the first liquid outlet 122 are disposed through two heat exchange surfaces 11, and the first liquid inlets 121 or first liquid outlets 122 of adjacent first liquid cooling plates 1 are arranged opposite each other, the connecting pipe 2 used for connection is short, reducing the flow distance of the coolant 3 and reducing its flow resistance in the pipe. The snap-fit ​​method is more convenient and faster than other methods such as threaded connections, resulting in higher installation efficiency.

[0059] More specifically, the first connector 13 and the second connector 22 are quick-connect connectors, which improve the connection efficiency of the connecting pipe 2 and also improve the reliability of the connection.

[0060] In a further embodiment, to prevent the continuous discharge of coolant 3 from the first liquid cooling plate 1 during disassembly and assembly, which would affect the operator's work, after the first connector 13 is separated from the second connector 22, the first connector 13 seals the corresponding first inlet 121 or first outlet 122. In this embodiment, the first connector 13 has a resiliently configured sealing core 131 inside. Figure 4 a and Figure 4As shown in Figure b, after the first connector 13 and the second connector 22 are engaged, the second connector 22 pushes the sealing core 131 into the first connector 13, making the inner cavity of the second connector 22 communicate with the inner cavity of the first connector 13, allowing the coolant 3 to pass through smoothly. When the first connector 13 disengages from the second connector 22, the sealing core 131 is reset, resealing the port of the first connector 13, so that the coolant 3 in the first liquid cooling plate 1 is retained in the capillary tube 12. Of course, the second connector 22 is also equipped with a sealing core 131, the structure of which should be used in conjunction with the first connector 13, and enter the first connector 13 together with the sealing core 131 of the first connector 13. The first connector 13 can also adopt other sealing methods, but since there are many sealing methods for connectors, they will not be described in detail here.

[0061] like Figure 5 As shown, in some embodiments, the pipe body 21 includes a cavity 211, a deformation layer 212, and a support layer 213 arranged sequentially from the inside to the outside. The coolant 3 flows in the cavity 211. When the temperature of the coolant 3 decreases, the shape and position of the support layer 213 remain basically unchanged, while the volume of the coolant 3 decreases. The deformation layer 212 is deformed by pressure in the direction of the cavity 211, which reduces the inner diameter of the pipe body 21.

[0062] In this embodiment, the deformation layer 212 is a volume-variable elastomer, such as an elastomer made of elastic materials like rubber or foam. Normally, the coolant 3 is pressurized during flow. After entering the cavity 211, the deformation layer 212 deforms and contracts under the pressure of the coolant 3, but the amount of contraction will not reach the upper limit of the elastomer. As the volume of the coolant 3 continues to increase, the deformation layer 212 absorbs the volume change due to expansion, and the inner diameter of the cavity 211 also increases accordingly. Figure 5 a Figure 5 b. Transition. At this time, the changes in pressure and flow rate of coolant 3 are reduced, and the impact on pipe 21 and liquid cooling system is reduced. In order to stabilize the deformation posture of deformation layer 212, deformation layer 212 is attached and fixed to support layer 213, which slows down the accelerated aging of deformation layer 212 caused by long-term random torsion.

[0063] Considering that the coolant 3 may seep into the deformation layer 212, in other embodiments, the deformation layer 212 facing the lumen 211 is covered with a flexible diaphragm (not shown in the figure) for isolation. In addition, the support layer 213 is usually made of metal or hard rubber as a rigid body to ensure the accurate length of the connecting pipe 2.

[0064] like Figure 6As shown, in some embodiments, the deformation layer 212 includes an elastic element 2121 and a temperature-sensitive element 2122 disposed inside the elastic element 2121. The temperature-sensitive element 2122 is made of a temperature-sensitive material that deforms upon temperature changes. Specifically, the temperature-sensitive element 2122 is a shape memory metal, such as a pipe network made of a shape memory metal. Typically, the structure of the temperature-sensitive element 2122 is often mesh-like, and wrapping the elastic element 2121 around the temperature-sensitive element 2122 can form a sealed cavity 211.

[0065] like Figure 6 a and Figure 6 As shown in Figure b, when the temperature of the coolant 3 rises and its volume increases, the temperature sensor 2122 deforms due to heat, causing the deformation layer 212 to actively expand its inner diameter. Conversely, the opposite occurs when the temperature of the coolant 3 decreases. By responding to temperature changes in the coolant 3 through the temperature sensor 2122 and actively adjusting the inner diameter of the pipe body 21, the fluctuation of various parameters in the liquid cooling pipeline can be further reduced, improving the stability and service life of the liquid cooling system. To ensure unrestricted deformation, the deformation layer 212 in the above structure is generally not attached to the support layer 213, and a certain amount of deformation space needs to be reserved.

[0066] In this embodiment, the external terminal 201 of the battery pack 200 is located on the same side as the first liquid inlet 121 and the first liquid outlet 122, which facilitates the installation and maintenance of the battery pack 200 and the first liquid cooling plate 1.

[0067] In summary, the battery liquid cooling assembly provided by this utility model places the first liquid inlet and the first liquid outlet on the same side of the first liquid cooling plate, and then connects adjacent first liquid inlets and first liquid outlets through connecting pipes, significantly reducing the number of pipe connections around the first liquid cooling plate. While ensuring heat exchange efficiency, it reduces the risk of pipe leakage and also improves the installation efficiency of the battery liquid cooling system.

[0068] Secondly, because the inner diameter of the pipe increases as the coolant temperature rises, or decreases as the coolant temperature falls, it adapts to the thermal expansion and contraction of the coolant due to temperature changes, reducing pressure and flow fluctuations within the pipe and ensuring the stability of the entire liquid cooling system. With fewer pipes, the coolant flow resistance within the pipes is also reduced, resulting in higher overall heat exchange efficiency of the liquid cooling system and more precise temperature difference control of the battery pack.

[0069] In addition, the battery liquid cooling component provided by this utility model can ensure heat exchange effect while occupying less equipment space and having a lower overall cost.

[0070] Example 2:

[0071] This embodiment makes further structural optimizations based on Embodiment 1. Please refer to... Figures 1-6 Based on the above, refer to Figures 7-8The difference between this embodiment and Embodiment 1 is that the battery liquid cooling assembly 100 in this embodiment includes a main liquid inlet pipe 4 and a main liquid outlet pipe 5. The main liquid inlet pipe 4 and the main liquid outlet pipe 5 are arranged in pairs and are located on the side of the first liquid cooling plate 1 that is not attached to the battery pack 200. The first liquid inlet 121 and the first liquid outlet 122 on the first liquid cooling plate 1 are connected to the main liquid inlet pipe 4 and the main liquid outlet pipe 5 respectively through the connecting pipe 2.

[0072] like Figure 7 As shown, the first liquid cooling plate 1 and the battery pack 200 are stacked in the height direction Z. The lowermost first liquid cooling plate 1 and the uppermost first liquid cooling plate 1 have a heat exchange surface 11 that is not attached to the battery pack 200. One side of this surface can be used to install the main liquid inlet pipe 4 and the main liquid outlet pipe 5. In this embodiment, the main liquid inlet pipe 4 and the main liquid outlet pipe 5 are located below in the height direction Z.

[0073] The main inlet pipe 4 and the main outlet pipe 5 connect the pre-connected sets of first liquid cooling plates 1 to the inlet and outlet of the liquid cooling system. Coolant 3 is pumped out by the liquid cooling system and flows from the main inlet pipe 4 to each set of first liquid cooling plates 1. After passing through the connecting pipe 2 and each first liquid cooling plate 1, it flows back to the main outlet pipe 5, and finally returns to the liquid cooling system through the main outlet pipe 5, thus achieving the circulation of coolant 3.

[0074] Multiple sets of first liquid cooling plates 1 connected in series can be connected to the main inlet pipe 4 and the main outlet pipe 5 to provide liquid cooling for multiple battery packs 200. This reduces the number of pipes and connectors, lowers costs, and improves installation efficiency.

[0075] To ensure that each group of first liquid cooling plates 1 can operate independently and as a complete system, valves 6 are further installed at the connection points of the main inlet pipe 4 and the main outlet pipe 5 with the connecting pipe 2. Valves 6 control the flow rate and on / off state of the coolant 3. When maintenance or replacement of a single group of first liquid cooling plates 1 is required, valve 6 can be disconnected to disassemble the connecting pipe 2 connecting the main inlet pipe 4 and the main outlet pipe 5 without shutting down the entire liquid cooling system. This enables online maintenance and improves the utilization rate of the battery pack. Considering the heat dissipation requirements of the battery pack under different charging states, the heat exchange efficiency of the liquid cooling system is improved by adjusting the size of valve 6. For example, during high-power charging and discharging of the battery pack 200, valve 6 is adjusted to its maximum to increase the flow of coolant 3, while when the battery pack 200 is fully charged, valve 6 is adjusted to its minimum to reduce the inflow of coolant 3 and minimize unnecessary consumption.

[0076] In practical applications, to meet the requirements of remote control, valve 6 can be a ball valve, gate valve, or needle valve with electric control and detection. The main inlet pipe 4 and the main outlet pipe 5 can also be configured with the same pipe structure as the connecting pipe 2.

[0077] In summary, the battery liquid cooling assembly provided in this embodiment allows the first liquid cooling plates used in each battery pack to be connected through the main inlet pipe and the main outlet pipe. Compared with existing solutions, this provides a simpler circuit and more convenient connection when expanding energy storage devices.

[0078] Example 3:

[0079] This embodiment, based on Embodiments 1 and 2 above, provides a battery liquid cooling assembly 100. Please refer to... Figures 1-8 Based on this, refer to Figure 9 The difference lies in that, in this embodiment, the battery liquid cooling assembly 100 further includes a second liquid cooling plate 7, which is perpendicular to the first liquid cooling plate 1 and is attached to the battery pack 200. The second liquid cooling plate 7 includes a second liquid inlet 71 and a second liquid outlet 72, and adjacent second liquid cooling plates 7 are connected by connecting pipes 2.

[0080] The second liquid cooling plate 7 has a basically the same functional structure as the first liquid cooling plate 1, but when the side of the battery pack 200 is large, setting the second liquid cooling plate 7 can achieve faster heat exchange efficiency. Figure 9 As shown, the second liquid cooling plate 7 is disposed on one side of the horizontal X of the battery pack 200, while in some embodiments, the second liquid cooling plate 7 is disposed on both sides of the horizontal X of the battery pack.

[0081] The functions of the second liquid inlet 71 and the second liquid outlet 72 are the same as those of the first liquid inlet 121 and the first liquid outlet 122, and their connection logic is also basically the same, so they will not be described in detail here.

[0082] It should be noted that, considering space constraints, adjacent second liquid inlets 71 and second liquid outlets 72 cannot be positioned opposite each other. However, they can be staggered along the height direction and longitudinal direction Y to allow for the connection of adjacent second liquid cooling plates 7. In other embodiments, the second connector 22 can be a 90° elbow, thereby reducing the bending of the connecting pipe 2 and reducing the space occupied by the connecting pipe 2.

[0083] When connected to the liquid cooling system, a similar connection method can be used, with the connecting pipe 2 directly connected to the main liquid inlet pipe 4 and the main liquid outlet pipe 5 for individual control. However, in this embodiment, to meet modular control and management requirements, on the first liquid cooling plate 1 facing away from the main liquid inlet pipe 4 and the main liquid outlet pipe 5, the first liquid inlet 121 and the first liquid outlet 122 are connected to the adjacent second liquid inlet 71 and the second liquid outlet 72 respectively via the connecting pipe 2. Thus, in terms of pipe connection, all the first liquid inlets 121 and the second liquid inlets 71 located in the same group of battery packs 200 are connected in series. Similarly, all the first liquid outlets 122 and the second liquid outlet 122 are also connected in series. The heat dissipation pipes of the same group of battery packs 200 only need two connecting pipes 2 to be connected to the main liquid inlet pipe 4 and the main liquid outlet pipe 5 respectively, which facilitates later maintenance and control, and further reduces the number of pipes and production costs.

[0084] The above description is merely an example and illustration of the structure of this utility model, and while the description is quite specific and detailed, it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these obvious substitutions all fall within the protection scope of this utility model.

Claims

1. A battery liquid cooling assembly for heat exchange in a battery pack, characterized in that, include: A first liquid cooling plate (1) includes a heat exchange surface (11) and a capillary tube (12). The capillary tube (12) is wound around the first liquid cooling plate (1) and located between the two heat exchange surfaces (11). The heat exchange surfaces (11) are in close contact with the battery pack (200). The capillary tube (12) is provided with a first liquid inlet (121) and a first liquid outlet (122) penetrating the heat exchange surfaces (11). The connecting pipe (2) includes a pipe body (21), and the first liquid inlet (121) and the first liquid outlet (122) of two adjacent first liquid cooling plates (1) are connected through the connecting pipe (2), and the coolant flows between the connecting pipe (2) and the capillary tube (12); The first liquid cooling plate (1) is disposed on the upper and lower sides of the battery pack (200); the first liquid inlet (121) and the first liquid outlet (122) are located on the same side of the first liquid cooling plate (1); the inner diameter of the tube (21) increases as the temperature of the coolant increases, and the inner diameter of the tube (21) decreases as the temperature of the coolant decreases.

2. The battery liquid cooling assembly according to claim 1, characterized in that, The first liquid cooling plate (1) includes a first connector (13), which is disposed on the first liquid inlet (121) and the first liquid outlet (122). The connecting pipe (2) includes a second connector (22) that matches the first connector (13), which is disposed at both ends of the pipe body (21). When adjacent first liquid inlets (121) or first liquid outlets (122) are connected, the first connector (13) and the second connector (22) are engaged and snapped together. The first connector (13) and the second connector (22) are quick-connect connectors.

3. The battery liquid cooling assembly according to claim 2, characterized in that, After being disconnected from the second connector (22), the first connector (13) seals the corresponding first inlet (121) or first outlet (122).

4. The battery liquid cooling assembly according to claim 1, characterized in that, The tube body (21) includes a cavity (211), a deformation layer (212), and a support layer (213) arranged sequentially from the inside to the outside. When the coolant temperature decreases, the shape and position of the support layer (213) remain basically unchanged, while the deformation layer (212) deforms, causing the inner diameter of the tube body (21) to decrease.

5. The battery liquid cooling assembly according to claim 4, characterized in that, The deformable layer (212) is a volume-variable elastomer and is attached and fixed to the support layer (213).

6. The battery liquid cooling assembly according to claim 4, characterized in that, The deformation layer (212) includes an elastic element (2121) and a temperature-sensitive element (2122) wrapped by the elastic element (2121), wherein the temperature-sensitive element (2122) is a shape memory metal.

7. The battery liquid cooling assembly according to claim 1, characterized in that, It includes a main liquid inlet pipe (4) and a main liquid outlet pipe (5), which are arranged in pairs and located on the side of the first liquid cooling plate (1) that is not attached to the battery pack (200); the first liquid inlet (121) and the first liquid outlet (122) on the first liquid cooling plate (1) are connected to the main liquid inlet pipe (4) and the main liquid outlet pipe (5) respectively through the connecting pipe (2).

8. The battery liquid cooling assembly according to claim 7, characterized in that, The main inlet pipe (4) and the main outlet pipe (5) are further provided with valves (6) at the connection points with the connecting pipe (2), and the valves (6) control the flow rate and on / off state of the coolant.

9. The battery liquid cooling assembly according to claim 8, characterized in that, It also includes a second liquid cooling plate (7), which is perpendicular to the first liquid cooling plate (1) and attached to the battery pack (200); the second liquid cooling plate (7) includes a second liquid inlet (71) and a second liquid outlet (72), and the second liquid inlet (71) and the second liquid outlet (72) of adjacent second liquid cooling plates (7) are connected by the connecting pipe (2).

10. The battery liquid cooling assembly according to claim 9, characterized in that, On the first liquid cooling plate (1) which is away from the main liquid inlet pipe (4) and the main liquid outlet pipe (5), the first liquid inlet (121) and the first liquid outlet (122) are connected to the adjacent second liquid inlet (71) and second liquid outlet (72) respectively through the connecting pipe (2).

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