Battery pack liquid cooling plate thermal management device

Abstract

The patent application belongs to the technical field of energy storage equipment, and particularly relates to a battery pack liquid cooling plate thermal management device, which comprises a shell and a plurality of battery modules, the plurality of battery modules are installed side by side in the shell, and further comprises a liquid cooling plate, the liquid cooling plate is arranged at the bottom of the plurality of battery modules and located in the shell; the bottom of the liquid cooling plate is provided with an inlet side and an outlet side, the liquid cooling plate is internally provided with a liquid cooling channel, and the refrigerant flows through the liquid cooling channel from the inlet side and flows out from the outlet side; a single first partition plate and a plurality of second partition plates are arranged in the liquid cooling channel, one end of the first partition plate is abutted against the inner wall of the liquid cooling channel, the inlet side and the outlet side are distributed on the two sides of the first partition plate, and the plurality of second partition plates are arranged on the two sides of the first partition plate respectively; the purpose of the battery pack liquid cooling device is to have high cooling efficiency, good temperature uniformity, and the risk of battery overheating and thermal runaway can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, specifically to a battery pack liquid cooling plate thermal management device. Background Technology

[0002] Batteries generate a lot of heat during charging and discharging. Temperature distribution has a significant impact on the performance of individual battery cells. Uneven temperature distribution in individual cells can lead to uneven chemical reactions inside the battery, thus affecting battery performance and lifespan. In a battery pack, if the temperature of some individual cells is too high or too low, it will cause the performance of these cells to degrade, thereby affecting the performance of the entire battery pack. Uneven temperature distribution can also lead to uneven current distribution in parallel branches, thus worsening the consistency of battery aging rate.

[0003] Traditional air-cooling technology is low in cost but not very efficient in heat dissipation, while water-cooling technology is more efficient but has the risk of leakage. Therefore, most current technologies use liquid cooling, which uses refrigerant to flow directly through liquid cooling channels in a liquid cooling plate to dissipate heat from the bottom of the battery pack. Even if a leak occurs, it will not cause a short circuit, reducing the risk of battery overheating and thermal runaway. However, most existing liquid cooling channels are S-shaped, and the refrigerant in the liquid cooling channel gradually absorbs heat, causing the refrigerant temperature to rise gradually with the flow distance. This can lead to higher local temperatures on the outlet side, which can easily cause uneven temperature distribution within the battery pack. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a battery pack liquid cooling plate thermal management device, which reduces the local temperature difference and makes the temperature distribution more uniform.

[0005] The technical solution adopted in this utility model is as follows: A battery pack liquid cooling plate thermal management device includes a housing and multiple battery modules, the multiple battery modules being installed side by side inside the housing, and also includes a liquid cooling plate disposed at the bottom of the multiple battery modules and located inside the housing; The liquid cooling plate has an inlet side and an outlet side at its bottom, and a liquid cooling channel is provided inside the liquid cooling plate. The refrigerant flows from the inlet side through the liquid cooling channel and flows out from the outlet side. The liquid cooling channel is provided with a single first partition and multiple second partitions. One end of the first partition abuts against the inner wall of the liquid cooling channel. The inlet side and outlet side are distributed on both sides of the first partition, and multiple second partitions are arranged on both sides of the first partition.

[0006] Compared with the prior art, the beneficial effects of this utility model are as follows: The second baffle forms multiple flow channels, while the first baffle divides the space into two regions. After the liquid flows in from the inlet side, it first disperses, then gathers and flows into the next region. The two adjacent regions can exchange heat, making their temperatures closer and thus reducing the local temperature difference. The heat exchange between the two regions makes the temperature distribution more uniform.

[0007] In a preferred embodiment of the present invention, the first partition and the second partition protrude from the liquid cooling plate.

[0008] Beneficial effects: By setting the protruding first and second partitions, they can act as reinforcing ribs, improving the overall structural strength of the liquid cooling plate and resisting deformation.

[0009] In a preferred embodiment of this utility model, the first partition, the second partition, and the liquid cooling plate are integrally formed.

[0010] Beneficial effects: The one-piece molding process ensures structural strength and reduces production costs compared to welding.

[0011] In a preferred embodiment of this utility model, the liquid cooling plate and the bottom of the battery module are provided with a thermally conductive filler.

[0012] Beneficial effects: Since the battery module is supported by the protruding part, the thermal conductivity is guaranteed by filling the gap between the liquid cooling plate and the battery module with a thermally conductive filler. Moreover, the cooperation between the thermally conductive filler and the distribution channel can eliminate the processing error of the liquid cooling plate regarding flatness compared to the solution where the liquid cooling plate is directly in contact with the battery module, and avoid the liquid cooling plate only partially contacting the liquid cooling plate, which would affect the heat dissipation effect.

[0013] In a preferred embodiment of this utility model, the thermally conductive filler is made of multiple silicone pads, which are bonded to the liquid cooling plate and rest against the protrusion of the distribution channel.

[0014] Beneficial effects: By setting silicone pads, the silicone pad plate can exchange heat with the liquid cooling plate, and the side wall of the distribution channel can contact the side of the silicone pad and exchange heat, which increases the heat dissipation area and improves the heat dissipation efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the battery pack in Embodiment 1 of the battery pack liquid cooling plate thermal management device of this utility model; Figure 2 This is a schematic diagram of the battery module structure of Embodiment 1 of the battery pack liquid cooling plate thermal management device of this utility model; Figure 3 This is a schematic diagram of the external structure of the liquid cooling plate in Embodiment 1 of the battery pack liquid cooling plate thermal management device of this utility model; Figure 4This is a schematic diagram of the internal flow direction of the liquid cooling plate in Embodiment 2 of the battery pack liquid cooling plate thermal management device of this utility model; Figure 5 This is a partial cross-sectional view of the liquid cooling plate in Embodiment 2 of the battery pack liquid cooling plate thermal management device of this utility model.

[0016] The reference numerals in the attached drawings include: housing 1, box cover 2, support frame 3, battery module 4, liquid cooling plate 5, outlet side 51, inlet side 52, first partition 53, second partition 54, flow channel 61, side flow channel 62, and thermally conductive filler 7. Detailed Implementation

[0017] Typical embodiments embodying the features and advantages of this utility model will be specifically described in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0018] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0019] Example 1: See Figure 1 , Figure 2 , Figure 3 As shown in the figure, this embodiment discloses a battery pack liquid cooling plate thermal management device, including a housing 1, a box cover 2, a support frame 3, a battery module 4, and a liquid cooling plate 5.

[0020] The support frame 3 is used to support the entire housing 1, the cover 2 is used to close the housing 1, the multiple battery modules 4 are installed inside the housing 1, the liquid cooling plate 5 is set at the bottom of the multiple battery modules 4 and located inside the housing 1; the bottom of the liquid cooling plate 5 is provided with an inlet side 52 and an outlet side 51, and the liquid cooling plate 5 is provided with a liquid cooling channel (i.e., the inside is a cavity), the refrigerant flows from the inlet side 52 through the liquid cooling channel and flows out from the outlet side 51.

[0021] See Figure 3 As shown, the liquid cooling channel includes multiple main channels, and is provided with a single first partition 53 and multiple second partitions 54. One end of the first partition 53 abuts against the inner wall of the liquid cooling channel. The inlet side 52 and the outlet side 51 are distributed on both sides of the first partition 53, and the multiple second partitions 54 are respectively arranged on both sides of the first partition 53.

[0022] In this embodiment, refer to Figure 3The second baffle 54 forms multiple flow channels, and the first baffle 53 divides it into two areas. After the liquid flows in from the inlet side, it first disperses, then gathers and flows into the next area.

[0023] The first partition 53, the second partition 54, and the liquid cooling plate 5 are integrally formed. The first partition 53 and the second partition 54 protrude from the liquid cooling plate 5, which can act as reinforcing ribs to improve the overall structural strength of the liquid cooling plate 5 and resist deformation.

[0024] In other embodiments, the thermally conductive filler 7 may also be a thermally conductive gel.

[0025] Example 2: See Figure 4 , Figure 5 As shown in the embodiment, the liquid cooling channel includes multiple main channels, which are arranged in a U-shape. Each main channel includes multiple parallel branch channels 61 and two corresponding side channels 62. The refrigerant is diverted from the side channel 62 on one side to multiple branch channels 61, and then converges to the side channel 62 on the other side before flowing to the next main channel.

[0026] In this embodiment, see Figure 4 As shown, there are a total of ten branch channels, with two groups of three branch channels and two groups of two branch channels. Each group of branch channels forms a heat dissipation area. The multiple heat dissipation areas are staggered and exchange heat with each other, thereby ensuring the temperature uniformity inside the battery pack. The cross-section of the branch channel 61 is rectangular, and one end of the rectangle protrudes from the liquid cooling plate 5. The liquid cooling plate 5 is integrally formed with the main channel. By setting the protruding rectangular branch channel 61, the branch channel 61 can act as a reinforcing rib, improve the overall structural strength of the liquid cooling plate 5, and resist deformation.

[0027] In other embodiments, the flow channel 61 may also be welded.

[0028] Among them, see Figure 5 As shown, the liquid cooling plate 5 and the bottom of the battery module 4 are provided with a thermally conductive filler 7. The thermally conductive filler 7 is made of multiple silicone pads, which are bonded to the liquid cooling plate 5 and abut against the protrusion of the distribution channel 61. By setting the silicone pads, the silicone pads can exchange heat with the liquid cooling plate 5, and the side wall of the distribution channel 61 can contact the side of the silicone pads and exchange heat, thereby increasing the heat dissipation area and improving the heat dissipation efficiency.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A battery pack liquid cooling plate thermal management device, comprising a housing and multiple battery modules, wherein the multiple battery modules are installed side-by-side inside the housing, characterized in that: It also includes a liquid cooling plate, which is disposed at the bottom of multiple battery modules and located inside the housing; The liquid cooling plate has an inlet side and an outlet side at its bottom, and a liquid cooling channel is provided inside the liquid cooling plate. The refrigerant flows from the inlet side through the liquid cooling channel and flows out from the outlet side. The liquid cooling channel is provided with a single first partition and multiple second partitions. One end of the first partition abuts against the inner wall of the liquid cooling channel. The inlet side and outlet side are distributed on both sides of the first partition, and multiple second partitions are arranged on both sides of the first partition.

2. The battery pack liquid cooling plate thermal management device according to claim 1, characterized in that: The first and second partitions protrude from the liquid cooling plate.

3. The battery pack liquid cooling plate thermal management device according to claim 1, characterized in that: The first partition, the second partition, and the liquid cooling plate are integrally formed.

4. The battery pack liquid cooling plate thermal management device according to claim 3, characterized in that: The liquid cooling plate and the bottom of the battery module are provided with thermally conductive fillers.

5. The battery pack liquid cooling plate thermal management device according to claim 4, characterized in that: The thermally conductive filler consists of multiple silicone pads, which are bonded to the liquid cooling plate and rest against the protrusions of the distribution channel.

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