Liquid cooling plate and corresponding battery pack

Abstract

The utility model provides a liquid cooling plate and a battery pack. The liquid cooling plate comprises a substrate and a liquid cooling structure. The liquid cooling structure comprises an input head, an input pipe, a shunting pipe, a plurality of liquid cooling pipes, a collecting pipe, an output pipe and an output head. One end of the input pipe is connected with the input head. A shunt liquid inlet is formed in one side of the shunt pipe and connected with the other end of the input pipe, and a plurality of first shunt liquid outlets are formed in the other side of the shunt pipe. The plurality of liquid cooling pipes are in a convolution bending shape and are divided into a plurality of groups, and one end of each group of liquid cooling pipes is correspondingly connected with the plurality of first shunt liquid outlets. One side of the collecting pipe is provided with a collecting liquid outlet and a plurality of collecting liquid inlets, and the plurality of collecting liquid inlets are respectively connected with the other ends of the liquid cooling pipes. And one end of the output pipe is connected with the collection liquid outlet. The output head is connected with the other end of the output pipe. The battery pack comprises a battery module and the liquid cooling plate. According to the liquid cooling plate and the battery pack disclosed by the utility model, the temperature of each battery cell of the battery module is balanced.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling plate technology, and in particular to a liquid cooling plate and a corresponding battery pack. Background Technology

[0002] In MW-level energy storage systems, cell temperature control and battery temperature difference control are crucial technologies, directly impacting battery lifespan and consistency. Current mainstream battery pack designs employ liquid cooling, almost universally using a bottom-mounted liquid cooling plate, utilizing the principle of water flow to exchange heat. Cells are typically arranged sequentially along the water flow direction, allowing heat to be carried away gradually. However, based on actual system operation and simulation results, this flow channel design introduces a system temperature difference between cells. During battery cooling, the outlet temperature is objectively higher than the inlet temperature. Therefore, in traditional flow channel batteries, the cells closest to the outlet have the highest temperature due to the sequential arrangement of water flow. Specifically... Figure 1 As shown. Therefore, the cooling temperature difference between different areas of the existing liquid cooling plate is relatively large, which in turn leads to a large difference in the operating temperature of each cell in the battery module of the corresponding battery pack.

[0003] Therefore, it is necessary to provide a liquid cooling plate and a corresponding battery pack to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a liquid cooling plate and a corresponding battery, which makes the temperature of each cell in the battery module more even.

[0005] The technical solution of this utility model is as follows:

[0006] A liquid cooling plate for heat exchange between individual cells of a battery module via the flow of a working fluid, comprising:

[0007] A substrate, one side of which is used to fix the battery module; and,

[0008] A liquid-cooled structure is disposed on the other side of the substrate. The liquid-cooled structure includes an input head, an input pipe, a branch pipe, multiple liquid-cooled pipes, a collecting pipe, an output pipe, and an output head. The input head is used to input the working fluid. One end of the input pipe is connected to the input head. The branch pipe extends along a first direction, with a branch inlet on one side connected to the other end of the input pipe, and multiple first branch outlets on the other side, arranged along the first direction. The multiple liquid-cooled pipes are all spirally bent and divided into multiple groups, arranged along the first direction. One end of each group of liquid-cooled pipes is connected to one of the multiple first branch outlets. The collecting pipe extends along the first direction. The manifold is located on the side of the liquid cooling pipe away from the branch pipe, with the second direction perpendicular to the first direction. One side of the manifold has a manifold outlet and multiple manifold inlets, arranged along the first direction. The manifold outlet is located at one end of the manifold, and the multiple manifold inlets are connected to the other end of each group of liquid cooling pipes. The output pipe extends along the second direction, with one end connected to the manifold outlet. In the second direction, all the liquid cooling pipes are located on the same side of the output pipe. The output head is used to output the working fluid and is connected to the other end of the output pipe. In the second direction, the output head and the input head are located on the same side of the branch pipe.

[0009] In the liquid cooling plate of this utility model, the liquid inlet is provided as a plurality of liquid outlets arranged along the first direction, and the input pipe is provided as a plurality of pipes, one end of each input pipe being connected to the input head, and the other end of each input pipe being connected to the plurality of liquid inlets respectively.

[0010] In the liquid cooling plate of this utility model, a plurality of flow-dividing spacers are provided in the flow-dividing pipe, and the plurality of flow-dividing spacers are arranged at intervals along the first direction.

[0011] In the liquid cooling plate of this utility model, the group of liquid cooling pipes furthest from the output pipe rotates in the opposite direction to the rotation direction of the other groups of liquid cooling pipes, and this group of liquid cooling pipes extends to the end of the shunt pipe away from the output pipe.

[0012] In the liquid cooling plate of this utility model, a gap is provided between two adjacent sets of liquid cooling pipes.

[0013] In the liquid cooling plate of this utility model, each group of liquid cooling pipes includes multiple liquid cooling pipes.

[0014] In the liquid cooling plate of this utility model, the diversion pipe is further provided with a second diversion outlet, the second diversion outlet and the first diversion outlet are located on the same side of the diversion pipe, and the second diversion outlet is arranged adjacent to the output pipe; the liquid cooling structure also includes an isolation pipe, the isolation pipe is located between the output pipe and the liquid cooling pipe near the output pipe, one end of the isolation pipe is connected to the second diversion outlet, and the other end is connected to the collection inlet near the collection outlet.

[0015] In the liquid cooling plate of this utility model, a gap is provided between the output tube and the isolation tube.

[0016] In the liquid cooling plate of this utility model, a plurality of collecting spacers are provided inside the collecting pipe, and the plurality of collecting spacers are arranged at intervals along the first direction.

[0017] Another technical solution of this utility model is:

[0018] A battery pack comprising:

[0019] The aforementioned liquid cooling plate; and,

[0020] A battery module is disposed on one side of the substrate. The battery module includes multiple battery cells, which are arranged along the first direction and correspond to multiple sets of liquid cooling pipes.

[0021] Compared with the prior art, the advantages of this invention are as follows: Because the liquid cooling pipes of this invention are arranged in multiple groups along the second direction, and the working fluid in these multiple groups of liquid cooling pipes flows independently, heat exchange can be performed on each cell of the battery module arranged along the second direction, resulting in a more uniform temperature across all cells of the battery module. All liquid cooling pipes are located on the same side of the output pipe, which facilitates the arrangement of the liquid cooling pipes and the output pipe, and also prevents the working fluid in the output pipe from affecting the working fluid in the liquid cooling pipes. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0023] Figure 1 This is a temperature distribution diagram of the battery cell after cooling it using a liquid cooling plate, a technology that is currently in use.

[0024] Figure 2 This is a schematic diagram of the battery pack provided in a preferred embodiment of the present invention.

[0025] Figure 3A perspective view of a portion of the battery pack structure provided in a preferred embodiment of this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the liquid cooling plate provided in a preferred embodiment of the present invention.

[0027] Figure 5 This is a temperature distribution diagram of the battery cell after cooling it using the liquid cooling plate provided in the preferred embodiment of this utility model.

[0028] in,

[0029] 1. Liquid cooling plate,

[0030] 11. Substrate,

[0031] 12. Liquid cooling structure,

[0032] 121. Input header,

[0033] 122. Input tube,

[0034] 123. Diverter pipe; 1231. Diverter inlet; 1232. First diverter outlet; 1233. Diverter spacer; 1234. Second diverter outlet.

[0035] 124. Liquid cooling pipes

[0036] 125. Manifold, 1251. Manifold outlet, 1252. Manifold inlet, 1253. Manifold partition.

[0037] 126. Output tube,

[0038] 127. Output head

[0039] 128. Isolation tube,

[0040] 2. Battery module, 21. Battery cell.

[0041] In the diagram, units with similar structures are represented by the same labels. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0043] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0044] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Currently, the mainstream battery pack design in the industry adopts a liquid cooling solution, almost entirely using a method where the bottom of the battery cell is tightly attached to a liquid cooling plate, utilizing the principle of heat exchange through the flow of water on the plate. The battery cells are generally arranged sequentially along the direction of the water flow on the liquid cooling plate. In this way, the heat from each cell is carried away gradually by the flowing water, achieving the cooling function. Please refer to [reference needed]. Figure 1 Based on actual system operation and simulation results, this flow channel design technology results in a system temperature difference between the cell temperatures. During the battery cooling process, the outlet temperature is objectively higher than the inlet temperature. Therefore, in traditional flow channel batteries, the cells arranged sequentially according to the water flow direction have the highest temperature closest to the flow channel outlet.

[0047] The following is a preferred embodiment of a battery pack provided by this utility model that can solve the above technical problems.

[0048] Please refer to Figure 2 A preferred embodiment of the present invention provides a battery pack, which includes a liquid cooling plate 1 and a battery module 2.

[0049] Please refer to Figure 2 and Figure 4The liquid cooling plate 1 is used to exchange heat between the individual cells of the battery module 2 through the flow of working fluid, which can heat up or cool down the cells. The liquid cooling plate 1 includes a substrate 11 and a liquid cooling structure 12. The battery module 2 is disposed on one side of the substrate 11, and the liquid cooling structure 12 is disposed on the other side of the substrate 11. The liquid cooling structure 12 includes an input head 121, an input pipe 122, a shunt pipe 123, multiple liquid cooling pipes 124, a collecting pipe 125, an output pipe 126, and an output head 127. The input head 121 is used to input the working fluid. One end of the input pipe 122 is connected to the input head 121. The shunt pipe 123 flows along a first direction ( Figure 4 Extending in the x-direction, a liquid inlet 1231 is provided on one side, which is connected to the other end of the input pipe 122. Multiple first liquid outlets 1232 are provided on the other side, arranged along the first direction. Multiple liquid cooling pipes 124 are all spirally bent, divided into multiple groups, arranged along the first direction. One end of each group of liquid cooling pipes 124 is connected to one of the multiple first liquid outlets 1232. A collecting pipe 125 extends along the first direction. In the second direction (… Figure 4 In the first direction (y-direction), the manifold 125 is located on the side of the liquid cooling pipe 124 away from the branch pipe 123. The second direction is perpendicular to the first direction. A manifold outlet 1251 and multiple manifold inlets 1252 are provided on one side of the manifold 125. The manifold outlet 1251 and multiple manifold inlets 1252 are arranged along the first direction, with the manifold outlet 1251 located at one end of the manifold 125. The multiple manifold inlets 1252 are respectively connected to the other end of each group of liquid cooling pipes 124. The output pipe 126 extends along the second direction, with one end connected to the manifold outlet 1251. In the second direction, all liquid cooling pipes 124 are located on the same side of the output pipe 126. The output head 127 is used to output the working fluid and is connected to the other end of the output pipe 126. In the second direction, the output head 127 and the input head 121 are located on the same side of the branch pipe 123.

[0050] Please refer to Figure 3 The battery module 2 includes multiple battery cells 21, which are arranged along a first direction and correspond to multiple sets of liquid cooling pipes 124 respectively.

[0051] In use, the liquid cooling plate 1 and battery pack of this invention involve inputting the working fluid from the input head 121 into the input pipe 122, then flowing into the branch pipe 123 through the branch inlet 1231, and then being delivered to each group of liquid cooling pipes 124 through the first branch outlet 1232. The working fluid flows through each group of liquid cooling pipes 124 to exchange heat with each cell of the battery module 2. After completing the heat exchange, the working fluid in each group of liquid cooling pipes 124 is collected into the collection pipe 125 through multiple collection inlets 1252. The working fluid continues to flow, flowing from the collection outlet 1251 into the output pipe 126, and finally output from the output head 127. Because the liquid cooling pipes 124 are configured as multiple groups arranged along the second direction, and the working fluid in the multiple groups of liquid cooling pipes 124 flows independently, heat exchange can be performed on each cell of the battery module 2 arranged along the second direction, resulting in a uniform temperature of each cell in the battery module 2. Figure 5 The diagram illustrates the temperature distribution after cooling each cell of battery module 2, showing that the temperature of each cell in battery module 2 is uniform. All liquid cooling pipes 124 are located on the same side of the output pipe 126, which facilitates the arrangement of the liquid cooling pipes 124 and the output pipe 126, and also avoids the working fluid in the output pipe 126 from affecting the working fluid in the liquid cooling pipe 124.

[0052] Please refer to Figure 4 The liquid inlets 1231 are arranged in multiple ways along the first direction, and the input pipes 122 are multiple inlets. One end of each input pipe 122 is connected to the input head 121, and the other end of each input pipe 122 is connected to one of the multiple liquid inlets 1231. By supplying the working fluid into the distribution pipes 123 through the multiple input pipes 122, the working fluid in the distribution pipes 123 can be evenly distributed, thereby evenly supplying the working fluid to the multiple sets of liquid cooling pipes 124 to improve the heat exchange effect. Figure 4 The input tube 122 shown in the diagram consists of two tubes.

[0053] Please continue to refer to Figure 4 The diversion pipe 123 is provided with multiple diversion spacers 1233, which are arranged at intervals along the first direction. The multiple diversion spacers 1233 can make the working fluid output uniformly from each of the first diversion outlets 1232, thereby uniformly delivering the working fluid to multiple sets of liquid cooling pipes 124 to improve the heat exchange effect.

[0054] Please continue to refer to Figure 4The group of liquid cooling pipes 124 furthest from the output pipe 126 rotates in the opposite direction to the other groups of liquid cooling pipes 124. This group of liquid cooling pipes 124 extends to the end of the branch pipe 123 furthest from the output pipe 126. This structure allows the two first branch outlets 1232, which are furthest from the output pipe 126, to be closer together, thus shortening the length of the branch pipe 123. One group of liquid cooling pipes 124 can extend to the end of the branch pipe 123 furthest from the output pipe 126, thereby improving heat exchange efficiency.

[0055] Please continue to refer to Figure 4 A gap is provided between two adjacent sets of liquid cooling pipes 124 so that the working fluid output from one set of liquid cooling pipes 124 will not affect the working fluid in the other set of liquid cooling pipes 124, thereby improving the heat exchange effect.

[0056] Please continue to refer to Figure 4 Each group of liquid cooling pipes 124 includes multiple liquid cooling pipes 124, which can accelerate heat exchange. Figure 4 Each group shown in the diagram includes two liquid cooling pipes 124.

[0057] Please continue to refer to Figure 4 The diversion pipe 123 is also provided with a second diversion outlet 1234, which is located on the same side of the diversion pipe 123 as the first diversion outlet 1232, and is adjacent to the output pipe 126. The liquid cooling structure 12 also includes an isolation pipe 128, which is located between the output pipe 126 and the liquid cooling pipes 124 near the output pipe 126. One end of the isolation pipe 128 is connected to the second diversion outlet 1234, and the other end is connected to the collection inlet 1252 near the collection outlet 1251. By providing an isolation pipe 128 between the output pipe 126 and a group of liquid cooling pipes 124 near the output pipe 126, the working fluid in the output pipe 126 can be prevented from affecting the working fluid in the liquid cooling pipes 124.

[0058] Please continue to refer to Figure 4 A gap is provided between the output tube 126 and the isolation tube 128 to prevent the working fluid in the output tube 126 from affecting the working fluid in the isolation tube 128, thereby preventing it from affecting the working fluid in the liquid cooling tube 124.

[0059] Please continue to refer to Figure 4 The manifold 125 contains multiple manifold spacers 1253, which are spaced apart along a first direction. The manifold 125 has a large diameter and is prone to deformation if it comes into contact with other structures. The multiple manifold spacers 1253 inside the manifold 125 effectively prevent deformation.

[0060] The working principle of the battery pack in the preferred embodiment of this utility model:

[0061] In operation, the working fluid is input from the input head 121 into each input pipe 122. The working fluid in each input pipe 122 then flows into the branch pipe 123 through each branch inlet 1231. Most of the working fluid in the branch pipe 123 is then transported to each group of liquid cooling pipes 124 through each first branch outlet 1232. The working fluid flows through each group of liquid cooling pipes 124 to exchange heat with each cell of the battery module 2. After completing the heat exchange, the working fluid in each group of liquid cooling pipes 124 is collected into the collection pipe 125 through multiple collection inlets 1252. The working fluid continues to flow, entering the output pipe 126 from the collection outlet 1251, and finally exiting from the output head 127. A small portion of the working fluid in the branch pipe 123 flows into the isolation pipe 128 through the second branch outlet 1234, isolating the working fluid in the liquid cooling pipe 124 from the working fluid in the output pipe 126.

[0062] This is the working principle of the battery pack in this preferred embodiment.

[0063] The liquid cooling plate and battery pack of this invention, because the liquid cooling pipes are arranged in multiple groups along the second direction, and the working fluid in the multiple groups of liquid cooling pipes flows independently, can exchange heat with each cell of the battery module arranged along the second direction, so that the temperature of each cell of the battery module is uniform. All liquid cooling pipes are located on the same side of the output pipe, which facilitates the arrangement of liquid cooling pipes and output pipes, and also avoids the working fluid in the output pipe from affecting the working fluid in the liquid cooling pipes.

[0064] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the concept of the technical solution of the present invention, should be included within the scope of protection of the present invention.

Claims

1. A liquid cooling plate for heat exchange between individual cells of a battery module via the flow of a working fluid, characterized in that, include: A substrate, one side of which is used to fix the battery module; as well as, A liquid-cooled structure is disposed on the other side of the substrate. The liquid-cooled structure includes an input head, an input pipe, a branch pipe, multiple liquid-cooled pipes, a collection pipe, an output pipe, and an output head. The input head is used to input the working fluid. One end of the input pipe is connected to the input head. The branch pipe extends along a first direction, with a branch inlet on one side connected to the other end of the input pipe, and multiple first branch outlets on the other side, arranged along the first direction. The multiple liquid-cooled pipes are all spirally bent and divided into multiple groups, arranged along the first direction. Each group of liquid-cooled pipes contains a liquid cooling fluid. One end of the cooling pipe is connected to one of the first diversion outlets respectively; the collecting pipe extends along the first direction; in the second direction, the collecting pipe is located on the side of the liquid cooling pipe away from the diversion pipe, the second direction is perpendicular to the first direction, one side of the collecting pipe is provided with a collecting outlet and a plurality of collecting inlets, the collecting outlet and the plurality of collecting inlets are arranged along the first direction, and the collecting outlet is located at one end of the collecting pipe, the plurality of collecting inlets are respectively connected to the other end of each group of liquid cooling pipes; the output pipe extends along the second direction, one end of which is connected to the collecting outlet. In the second direction, all the liquid cooling tubes are located on the same side of the output tube; the output head is used to output the working fluid and is connected to the other end of the output tube; in the second direction, the output head and the input head are located on the same side of the shunt tube.

2. The liquid cooling plate according to claim 1, characterized in that, The liquid inlet is configured as a plurality of inlets arranged along the first direction, and the input tube is configured as a plurality of tubes, one end of each input tube being connected to the input head, and the other end of each input tube being connected to a corresponding plurality of liquid inlets.

3. The liquid cooling plate according to claim 1, characterized in that, The diversion pipe is provided with a plurality of diversion interval blocks, which are arranged at intervals along the first direction.

4. The liquid cooling plate according to claim 1, characterized in that, The group of liquid cooling pipes furthest from the output pipe rotates in the opposite direction to the other groups of liquid cooling pipes, and this group of liquid cooling pipes extends to the end of the shunt pipe away from the output pipe.

5. The liquid cooling plate according to claim 1, characterized in that, A gap is provided between two adjacent sets of liquid cooling pipes.

6. The liquid cooling plate according to claim 1, characterized in that, Each group of liquid cooling pipes includes multiple liquid cooling pipes.

7. The liquid cooling plate according to claim 1, characterized in that, The diversion pipe is also provided with a second diversion outlet, which is located on the same side of the diversion pipe as the first diversion outlet, and is adjacent to the output pipe; the liquid cooling structure also includes an isolation pipe, which is located between the output pipe and the liquid cooling pipe near the output pipe, with one end of the isolation pipe connected to the second diversion outlet and the other end connected to the collection inlet near the collection outlet.

8. The liquid cooling plate according to claim 7, characterized in that, A gap is provided between the output tube and the isolation tube.

9. The liquid cooling plate according to claim 1, characterized in that, The collecting pipe is provided with a plurality of collecting spacers, which are arranged at intervals along the first direction.

10. A battery pack, characterized in that, include: The liquid cooling plate according to any one of claims 1-9; and, A battery module is disposed on one side of the substrate. The battery module includes multiple battery cells, which are arranged along the first direction and correspond to multiple sets of liquid cooling pipes.

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