A composite cold plate structure for a battery pack

Abstract

The utility model relates to battery thermal management technical field especially relates to a composite cold plate structure for battery package, including the heat dissipation board one of horizontal arrangement and the vertical arrangement of multiple groups of heat dissipation board two, the heat dissipation board one is composed of flow channel board one and flat plate, and the flow channel groove one is formed in flow channel board one through stamping, and the heat dissipation board two is composed of two groups of symmetrically arranged flow channel board two, and the flow channel groove two is formed in flow channel board two through stamping, the composite cold plate structure for battery package has solved the local high temperature gathering problem that traditional cold plate caused by the insufficient flow of intermediate area, has reduced the risk of overheat of battery cell, has guaranteed the work safety of battery package, has realized the optimized distribution of heat dissipation resource simultaneously, has improved the energy utilization efficiency of overall heat dissipation system, and the temperature gradient of battery cell in battery package has been significantly reduced, the overall temperature uniformity has been effectively improved, and the adverse effect of the too big temperature difference to the cycle life and consistency of battery cell has been avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, specifically a composite cold plate structure for battery packs. Background Technology

[0002] Currently, traditional cold plates mostly adopt a design with uniform flow channel width, which fails to adequately adapt to the different heat dissipation requirements of different areas within the battery pack. Cells in the middle area of ​​the battery pack are affected by the cumulative heat from surrounding cells, easily leading to localized high-temperature accumulation and requiring significantly more heat dissipation than other areas. Meanwhile, cells on the outer edges have better heat dissipation conditions due to easier heat exchange with the environment. This uniform flow channel design often results in insufficient coolant flow in the middle area, making it difficult to effectively remove accumulated heat and highlighting the risk of localized overheating. Simultaneously, the coolant flow in the outer areas is not specifically controlled, resulting in "ineffective consumption" of heat dissipation resources. Furthermore, excessive heat dissipation can widen the temperature difference between edge and middle cells, increasing the overall temperature gradient and resulting in poor temperature uniformity, severely restricting the overall performance of the battery pack. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a composite cold plate structure for battery packs, which solves the technical problem of poor temperature uniformity caused by the traditional cold plate flow channel structure failing to adapt to the different heat dissipation requirements of different areas within the battery pack.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a composite cold plate structure for a battery pack, comprising a horizontally arranged heat dissipation plate one and a plurality of vertically arranged heat dissipation plates two, wherein the heat dissipation plate one is composed of a flow channel plate one and a flat plate, and a flow channel groove one is formed in the flow channel plate one by stamping; the heat dissipation plate two is composed of two symmetrically arranged flow channel plates two, and a flow channel groove two is formed in the flow channel plate two by stamping.

[0005] The flow channel 1 consists of an inlet / outlet channel 1, an outer flow channel 1, and an inner flow channel 1. The inlet / outlet channel 1 is connected to the outer flow channel 1, and the outer flow channel 1 is connected to the inner flow channel 1. The outer flow channel 1 is located in the outer region of the flow channel plate 1, and the inner flow channel 1 is located in the inner region of the flow channel plate 1. The width of the inner flow channel 1 is greater than the width of the outer flow channel 1.

[0006] The second flow channel consists of an inlet / outlet channel, an outer flow channel, and an inner flow channel. The inlet / outlet channel is connected to the outer flow channel, and the outer flow channel is connected to the inner flow channel. The outer flow channel is located in the outer region of the second flow channel plate, and the inner flow channel is located in the inner region of the second flow channel plate. The width of the inner flow channel is greater than the width of the outer flow channel.

[0007] Preferably, the plate is provided with two inlet and outlet ports corresponding to the positions of the inlet and outlet water channels.

[0008] Preferably, the plate is provided with a plurality of through holes corresponding to the positions of the inlet and outlet water channels.

[0009] Preferably, the heat sink one and heat sink two, the flow channel plate one and the flat plate, and the two sets of flow channel plates two are all connected by brazing.

[0010] Preferably, the heat sink is attached to the bottom of the battery cell.

[0011] Preferably, the heat sink is attached to the side wall of the battery cell.

[0012] By employing the above technical solution, this utility model provides a composite cold plate structure for battery packs, which has at least the following beneficial effects:

[0013] 1. This composite cold plate structure for battery packs, by increasing the width of the inner flow channel, allows more coolant to flow precisely to the core heat-generating area of ​​the battery pack, effectively improving the heat dissipation efficiency of the middle cells. It specifically solves the problem of localized high temperature accumulation caused by insufficient flow in the middle area of ​​traditional cold plates, reducing the risk of cell overheating and ensuring the operational safety of the battery pack. At the same time, reducing the width of the outer flow channel avoids "ineffective flow" of coolant in the edge areas with lower heat dissipation requirements, achieving optimized allocation of heat dissipation resources and improving the energy utilization efficiency of the overall heat dissipation system. On the other hand, the widening of the inner flow channel enhances the heat exchange capacity of the core area, while the narrowing of the outer flow channel reduces excessive heat dissipation in the edge areas. The synergistic effect of these two factors significantly reduces the temperature gradient of the cells within the battery pack, effectively improving overall temperature uniformity and avoiding the adverse effects of excessive temperature differences on cell cycle life and consistency.

[0014] 2. The composite cold plate structure used in the battery pack, by setting multiple sets of vertically distributed heat dissipation plates II on heat dissipation plate I, allows the heat at the top of the battery cell to be directly dissipated through the coolant in the heat dissipation plate II that is in contact with it, effectively improving the temperature uniformity of the battery cell in the Z direction, which can effectively improve the battery's service life; when combined with the multi-directional heat dissipation of the vertical DC channel plate, it further enhances the "temperature uniformity" effect, providing a reliable guarantee for the efficient and stable operation of the battery pack, and helping to improve the overall performance of the power battery. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0016] Figure 1 This is a three-dimensional structural diagram of the overall surface of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the overall bottom of this utility model;

[0018] Figure 3This is a schematic diagram of the disassembled structure of the heat sink of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the heat sink plate after being disassembled into two parts.

[0020] Figure label:

[0021] 1. Heat sink plate one; 11. Flow channel plate one; 111. Flow channel groove one; 1111. Inlet and outlet water channel one; 1112. Outer flow channel one; 1113. Inner flow channel one; 12. Flat plate; 121. Through hole; 2. Heat sink plate two; 21. Flow channel plate two; 211. Flow channel groove two; 2111. Inlet and outlet water channel two; 2112. Outer flow channel two; 2113. Inner flow channel two; 3. Inlet and outlet. Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] With the rapid development of the new energy vehicle industry, the energy density and power density of power battery packs continue to rise, resulting in a significant increase in the heat generated during operation. The heat dissipation performance of the battery pack has become a core factor affecting cell efficiency, cycle life, and safety. As the mainstream liquid cooling component for battery packs, the flow channel structure design of the cold plate directly determines its heat dissipation efficiency and temperature uniformity.

[0024] Due to the technical shortcomings of existing technologies, such as poor temperature uniformity caused by varying heat dissipation requirements in different areas of the battery pack, please refer to... Figures 1-4This embodiment provides a composite cold plate structure for a battery pack, which solves the problem of localized high-temperature accumulation caused by insufficient flow in the middle area of ​​traditional cold plates, reducing the risk of cell overheating and ensuring the operational safety of the battery pack. Simultaneously, it optimizes the allocation of heat dissipation resources, improving the energy utilization efficiency of the overall heat dissipation system. Furthermore, it significantly reduces the temperature gradient of the cells within the battery pack, effectively improving overall temperature uniformity and avoiding the adverse effects of excessive temperature differences on cell cycle life and consistency. This structure includes a horizontally arranged heat dissipation plate and a vertically arranged... The system comprises multiple sets of heat dissipation plates 2. Heat dissipation plate 1 consists of a flow channel plate 11 and a flat plate 12. Flow channel grooves 111 are formed within the flow channel plate 111 by stamping. Heat dissipation plate 2 consists of two symmetrically arranged flow channel plates 21, each with flow channel grooves 211 formed within it by stamping. Specifically, flow channel groove 111 consists of inlet / outlet channels 1111, an outer flow channel 1112, and an inner flow channel 1113. The inlet / outlet channels 1111 are connected to the outer flow channel 1112, and the outer flow channel 1112 is connected to the inner flow channel 1113. The outer flow channel 1112 is located in the outer region of the flow channel plate 11, and the inner flow channel 1113 is located in the inner region of the flow channel plate 11. The width of the inner flow channel 1113 is greater than the width of the outer flow channel 1112. The flow channel 211 consists of the inlet / outlet channel 2111, the outer flow channel 2112, and the inner flow channel 2113. The inlet / outlet channel 2111 is connected to the outer flow channel 2112, and the outer flow channel 2112 is connected to the inner flow channel 2113. The outer flow channel 2112 is located in the outer region of the flow channel plate 21, and the inner flow channel 2113 is located in the inner region of the flow channel plate 21. In the inner region of the second channel plate 21, the width of the inner flow channel 2113 is greater than the width of the outer flow channel 2112. The greater width of the inner flow channel allows more coolant to flow to the inner region of the battery cell where heat is more concentrated, thereby improving the heat dissipation efficiency of the core area and avoiding local overheating. The reduced width of the outer flow channel reduces coolant waste and improves overall heat dissipation efficiency. The horizontal heat dissipation plate 1 and the vertical heat dissipation plate 2 work together to dissipate heat from the bottom and sides in multiple directions, making up for the deficiency of insufficient heat conduction in the Z direction of the battery cell, reducing the temperature difference between the top and bottom and inside and outside of the battery cell, and significantly improving temperature uniformity.

[0025] The existing single-plate cooling system has a simple inlet and outlet water structure design and a single coolant circulation path, making it difficult to achieve precise coolant supply and efficient return to the bottom channel. This may lead to uneven flow distribution within the channel, affecting heat dissipation stability. To address this issue, the plate 12 is equipped with two inlet and outlet ports 3 corresponding to the positions of the inlet and outlet channels 1111. The specially designed inlet and outlet ports 3 corresponding to the inlet and outlet channels 1111 ensure that the coolant flows precisely into / out of the channel slot 111, guaranteeing smooth coolant circulation and stable flow distribution within the bottom channel 111, thereby improving the reliability of bottom heat dissipation.

[0026] The existing technology lacks a vertical cold plate or the inlet / outlet structure of the vertical cold plate is poorly compatible with the bottom cold plate, resulting in difficulties in the supply / return of coolant in the vertical flow channel and making it impossible to effectively utilize the vertical cold plate for side heat dissipation. To address this issue, the plate 12 is provided with multiple through holes 121 corresponding to the positions of the inlet / outlet water channel 2111. The through holes 121 correspond to the inlet / outlet water channel 2111, enabling the vertical flow channel 211 to connect with external pipes or the bottom flow channel, ensuring that the coolant flows smoothly into / out of the vertical heat dissipation plate 2, guaranteeing the continuity and effectiveness of side heat dissipation, and enhancing the multi-directional heat dissipation effect.

[0027] The existing assembly method of cold plates has problems with poor sealing performance and insufficient structural strength, which can easily lead to coolant leakage. To address this issue, brazing is used between heat sink 1 and heat sink 2, between flow channel plate 11 and plate 12, and between the two sets of flow channel plates 21. Brazing can achieve a tight fit between the components, providing excellent sealing performance and preventing coolant leakage. At the same time, the overall brazing forms a stable integrated structure, improving the structural strength and durability of the cold plate. Furthermore, the direct connection between the metals facilitates heat conduction, further enhancing the heat dissipation effect.

[0028] The existing single cold plate only adheres to the bottom of the cell and cannot cover the sidewalls of the cell, resulting in poor heat dissipation from the sides of the cell and failing to solve the problem of large temperature difference in the Z direction, leading to poor temperature uniformity. To address this issue, heat sink 1 is adhered to the bottom of the cell, and heat sink 2 is adhered to the sidewalls of the cell. The combination of bottom and sidewall adhesion increases the contact area between the cold plate and the cell, enabling it to dissipate heat from both the bottom and sides of the cell simultaneously. In particular, the sidewall adhesion can directly dissipate heat from the top of the cell, compensating for the insufficient thermal conductivity in the Z direction, effectively reducing the temperature difference between the top and bottom of the cell, improving overall temperature uniformity, and extending battery life.

[0029] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite cold plate structure for a battery pack, characterized in that: It includes a horizontally arranged heat sink 1 (1) and a number of vertically arranged heat sink 2 (2). The heat sink 1 (1) is composed of a flow channel plate 1 (11) and a flat plate (12). The flow channel plate 1 (11) has a flow channel groove 1 (111) formed by stamping. The heat sink 2 (2) is composed of two symmetrically arranged flow channel plates 2 (21), and the flow channel plates 2 (21) have a flow channel groove 2 (211) formed by stamping. The flow channel 1 (111) is composed of an inlet / outlet channel 1 (1111), an outer flow channel 1 (1112), and an inner flow channel 1 (1113). The inlet / outlet channel 1 (1111) is connected to the outer flow channel 1 (1112), and the outer flow channel 1 (1112) is connected to the inner flow channel 1 (1113). The outer flow channel 1 (1112) is located in the outer region of the flow channel plate 1 (11), and the inner flow channel 1 (1113) is located in the inner region of the flow channel plate 1 (11). The width of the inner flow channel 1 (1113) is greater than the width of the outer flow channel 1 (1112). The second flow channel (211) consists of an inlet / outlet channel (2111), an outer flow channel (2112), and an inner flow channel (2113). The inlet / outlet channel (2111) is connected to the outer flow channel (2112), and the outer flow channel (2112) is connected to the inner flow channel (2113). The outer flow channel (2112) is located in the outer region of the second flow channel plate (21), and the inner flow channel (2113) is located in the inner region of the second flow channel plate (21). The width of the inner flow channel (2113) is greater than the width of the outer flow channel (2112).

2. The composite cold plate structure for a battery pack according to claim 1, characterized by: The plate (12) is provided with two inlet and outlet ports (3) corresponding to the position of the inlet and outlet waterway (1111).

3. The hybrid cold plate structure for a battery pack of claim 1, wherein: The plate (12) is provided with a plurality of through holes (121) corresponding to the positions of the inlet and outlet water channels (2111).

4. The hybrid cold plate structure for a battery pack of claim 1, wherein: The heat sink 1 (1) and heat sink 2 (2), the flow channel plate 1 (11) and the flat plate (12), and the two sets of flow channel plates 2 (21) are all connected by brazing.

5. The hybrid cold plate structure for a battery pack of claim 1, wherein: The heat sink (1) is attached to the bottom of the battery cell.

6. The hybrid cold plate structure for a battery pack of claim 1, wherein: The heat sink (2) is attached to the side wall of the battery cell.

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