Battery cooling and heat exchange structure

Abstract

The utility model relates to a battery cooling and heat exchange structure. The battery box comprises a battery box body, the battery box body is filled with insulating heat-conducting liquid, at least one cooling cavity is formed in the side wall of the battery box body, and the cooling cavity is filled with cooling liquid; the battery cell module is arranged in the battery box body and is immersed in the insulating heat-conducting liquid; the circulating pipe assembly is communicated with the cooling cavity, and the cooling liquid can flow in the cooling cavity through the circulating pipe assembly, so that heat dissipated by the battery cell module is conducted and dissipated through the cooling cavity. According to the utility model, the cooling cavity is integrated in the battery box body, so that the heat of the battery can be effectively led out through the flowing of the cooling liquid, the heat dissipation efficiency is improved, and as the insulating heat-conducting liquid is in direct contact with the wall of the cooling cavity, the heat generated after the battery cell module is heated can be quickly conducted to the cooling cavity through the insulating heat-conducting liquid; heat is led out through flowing of cooling liquid in the cooling cavity, and rapid cooling is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack thermal management, in particular to a battery cooling and heat exchange structure. Background Art

[0002] The currently used heat dissipation system for battery cell modules is based on the immersion liquid cooling method, and the battery cell modules will be completely immersed in insulating cooling liquids such as fluorinated liquids. The heat dissipation process relies on the direct physical contact between the battery cell modules and the cooling liquid. However, the traditional immersion cooling method has defects. It treats the entire battery pack as a space for containing fluid. In this method, a clearly divided flow path cannot be formed inside the battery pack, which may lead to insufficient coolant flow, resulting in dead zones with heat accumulation inside the battery pack. Such structural defects make it impossible for some areas of the battery pack, especially the batteries in the dead zones, to dissipate heat effectively, resulting in uneven temperature distribution inside the battery pack and increasing the possibility of thermal runaway. Summary of the Invention

[0003] Therefore, the utility model provides a battery cooling and heat exchange structure, which can effectively export the heat of the battery through the flow of the coolant by integrating a cooling cavity in the battery box.

[0004] To solve the above technical problems, the utility model provides a battery cooling and heat exchange structure, including:

[0005] A battery box filled with insulating and heat-conducting liquid, at least one cooling cavity is arranged on the side wall of the battery box, and the cooling cavity is filled with coolant;

[0006] A battery cell module arranged in the battery box and immersed in the insulating and heat-conducting liquid;

[0007] A circulation pipe assembly communicated with the cooling cavity, and the coolant can flow in the cooling cavity through the circulation pipe assembly to conduct and dissipate the heat dissipated by the battery cell module through the cooling cavity.

[0008] In an embodiment of the utility model, the cooling cavity includes an inflow port, a return port and a cooling flow path, the circulation pipe assembly includes an inflow pipe communicated with the inflow port and a return pipe communicated with the return port, and the coolant flows through the cooling flow path via the inflow pipe and then flows out to the return pipe.

[0009] In an embodiment of the utility model, the battery cell module has a cuboid structure, and the battery box has a hollow cuboid structure.

[0010] In an embodiment of the present utility model, the cooling cavity has a cuboid structure, and partition bars are horizontally arranged in the cooling cavity so that the cooling cavity forms an annular cooling flow channel. The inflow port and the return port are located on the same side of the cooling flow channel, and the inflow port is located above the return port.

[0011] In an embodiment of the present utility model, cooling cavities are provided on two opposite side walls of the battery box body. Two inflow pipes respectively communicating with the two cooling cavities are respectively connected to an inflow main pipe, and two return pipes respectively communicating with the two cooling cavities are respectively connected to a return main pipe. The inflow main pipe and the return main pipe respectively pass through the battery box body and are connected to a battery coolant circulation device.

[0012] In an embodiment of the present utility model, the two inflow pipes are arranged in a straight line and are perpendicular to the inflow main pipe, and the two return pipes are arranged in a straight line and are perpendicular to the return main pipe.

[0013] In an embodiment of the present utility model, the two inflow pipes and the inflow main pipe, and the two return pipes and the return main pipe are connected by three-way pipes respectively.

[0014] In an embodiment of the present utility model, a thermally conductive structural adhesive layer is attached to the bottom surface of the battery cell module.

[0015] In an embodiment of the present utility model, the insulating and thermally conductive liquid includes fluorinated liquid or silicone oil.

[0016] In an embodiment of the present utility model, the coolant includes water or ethylene glycol.

[0017] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0018] For a battery cooling and heat exchange structure of the present utility model, by integrating a cooling cavity in the battery box body, effective heat dissipation of the battery can be achieved through the flow of the coolant, improving the heat dissipation efficiency. Since the insulating and thermally conductive liquid is in direct contact with the wall of the cooling cavity, the heat generated after the battery cell module generates heat can be quickly conducted to the cooling cavity through the insulating and thermally conductive liquid, and the heat is dissipated through the flow of the coolant in the cooling cavity, realizing rapid cooling.

[0019] The utility model improves the heat exchange efficiency by directly immersing the battery cell module in an insulating and heat-conducting liquid with a high heat conduction coefficient and specific heat capacity. The setting of the cooling cavity enables a clearly divided flow path to be formed inside the battery pack, solving the problems of insufficient flow and dead zones that may exist in traditional immersion cooling methods. Compared with the traditional liquid-cooled plate heat dissipation method, this structure improves the temperature uniformity of the battery cell module, significantly reduces the risk of thermal runaway of the battery pack, and improves the energy density of the entire battery system. Integrating the cooling cavity into the battery box body greatly reduces the system pressure drop in the pipeline, reduces the power consumption of the liquid-cooling unit, and further improves the overall energy density. Brief Description of the Drawings

[0020] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to the specific embodiments of the utility model and in conjunction with the attached drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the battery cooling and heat exchange structure of the utility model.

[0022] Figure 2 It is an exploded schematic diagram of the battery cooling and heat exchange structure of the utility model.

[0023] Figure 3 It is an axonometric schematic diagram of the battery box body of the utility model.

[0024] Figure 4 It is a top view schematic diagram of the battery box body of the utility model.

[0025] Figure 5 is Figure 4 A sectional view schematic diagram along the A-A direction.

[0026] Explanation of the reference numerals in the drawings of the specification:

[0027] 1. Battery box body; 11. Cooling cavity; 111. Inflow port; 112. Return port; 113. Cooling flow channel; 12. Partition strip;

[0028] 2. Battery cell module;

[0029] 3. Circulation pipe assembly; 31. Inflow pipe; 32. Return pipe; 33. Inflow main pipe; 34. Return main pipe;

[0030] 4. Heat-conducting structural adhesive layer. Detailed Embodiments

[0031] The following further illustrates the utility model in conjunction with the attached drawings and specific embodiments, so that those skilled in the art can better understand the utility model and be able to implement it, but the embodiments cited do not limit the utility model.

[0032] In the present utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0033] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood to exclude the base number; "above", "below", "within", etc. are understood to include the base number. In the description of the present utility model, if "first" and "second" are described, they are only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0035] Referring to Figures 1 to 5 as shown, a battery cooling and heat exchange structure of the present utility model includes:

[0036] A battery box body 1 filled with an insulating and heat-conducting liquid, at least one cooling cavity 11 is arranged on the side wall of the battery box body 1, and the cooling cavity 11 is filled with a coolant;

[0037] A battery cell module 2 is arranged in the battery box body 1 and immersed in the insulating and heat-conducting liquid;

[0038] A circulation pipe assembly 3 is communicated with the cooling cavity 11, and the coolant can flow in the cooling cavity 11 through the circulation pipe assembly 3 to conduct and dissipate the heat dissipated by the battery cell module 2 through the cooling cavity 11.

[0039] Since the insulating and heat-conducting liquid is in direct contact with the wall of the cooling cavity 11, the heat generated after the battery cell module 2 generates heat can be quickly conducted to the cooling cavity 11 through the insulating and heat-conducting liquid, and the heat is exported through the flow of the coolant in the cooling cavity 11 to achieve rapid cooling.

[0040] By directly immersing the battery cell module 2 in an insulating and thermally conductive liquid with a high thermal conductivity and specific heat capacity (such as fluorinated liquid or silicone oil), the heat transfer efficiency is improved.

[0041] In some embodiments, the cooling cavity 11 includes an inflow port 111, a return port 112, and a cooling flow channel 113. The circulation pipe assembly 3 includes an inflow pipe 31 communicating with the inflow port 111 and a return pipe 32 communicating with the return port 112. The coolant flows through the cooling flow channel 113 via the inflow pipe 31 and then flows out to the return pipe 32.

[0042] In some embodiments, the battery cell module 2 has a cuboid structure, and the battery box 1 has a hollow cuboid structure.

[0043] The cooling cavity 11 has a cuboid structure. A partition strip 12 is horizontally arranged in the cooling cavity 11 to form the annular cooling flow channel 113. The inflow port 111 and the return port 112 are located on the same side of the cooling flow channel 113, and the inflow port 111 is located above the return port 112.

[0044] The cooling cavities 11 are provided on two opposite side walls of the battery box 1. The two inflow pipes 31 respectively communicating with the two cooling cavities 11 are respectively connected to an inflow main pipe 33, and the two return pipes 32 respectively communicating with the two cooling cavities 11 are respectively connected to a return main pipe 34. The inflow main pipe 33 and the return main pipe 34 respectively pass through the battery box 1 and are connected to a battery coolant circulation device (such as a liquid cooling unit). Ensure that the coolant (such as water or ethylene glycol) can flow on multiple sides of the entire battery cell module 2, thereby improving the heat dissipation efficiency.

[0045] Specifically, the two inflow pipes 31 are arranged in a straight line and perpendicular to the inflow main pipe 33, and the two return pipes 32 are arranged in a straight line and perpendicular to the return main pipe 34. The two inflow pipes 31 and the inflow main pipe 33, and the two return pipes 32 and the return main pipe 34 are connected by three-way pipes respectively.

[0046] Specifically, a thermally conductive structural adhesive layer 4 is attached to the bottom surface of the battery cell module 2.

[0047] By setting up the cooling cavity 11, the heat exchange of the insulating heat-conducting liquid is increased, thus significantly improving the heat transfer effect. This is because, compared with air, this coolant has physical properties such as a higher thermal conductivity and specific heat capacity. Since the battery cell module 2 is completely immersed in the insulating heat-conducting liquid, it can exchange heat more effectively. Subsequently, the cooling cavity 11 cools down the insulating heat-conducting liquid, which can not only solve the problem of flow dead zones but also improve the efficiency of the entire system. Compared with the traditional liquid-cooled plate heat dissipation method, it can improve the temperature uniformity of the battery cell module 2 and significantly reduce the risk of thermal runaway of the battery pack. Improving the temperature uniformity of the battery cells and slowing down the temperature rise of the battery cells can also increase the energy density of the entire battery system, thereby improving the performance and reliability of the battery.

[0048] During operation, when the battery cell module 2 dissipates heat during charge and discharge, the insulating heat-conducting liquid absorbs the heat dissipated by the battery cell module 2 and conducts it to the cooling cavity 11, and the coolant circulating in the cooling cavity 11 takes away the heat to complete the heat dissipation and cooling of the battery cell module 2. Compared with the traditional liquid-cooling scheme, it can improve the heat dissipation efficiency and increase the temperature uniformity of the battery cells. Since the cooling cavity 11 is integrated into the battery box 1, the integration degree is high, which greatly reduces the system pressure drop in the pipeline, reduces the power consumption of the liquid-cooling unit, and improves the overall energy density.

[0049] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A battery cooling and heat exchange structure, characterized in that: include: A battery box (1) filled with an insulating heat-conducting liquid, wherein a side wall of the battery box (1) is provided with at least one cooling cavity (11), and the cooling cavity (11) is filled with a cooling liquid; A battery cell module (2) is arranged in the battery box (1) and immersed in the insulating heat-conducting liquid; A circulation pipe assembly (3) is connected to the cooling cavity (11), and the coolant can flow in the cooling cavity (11) through the circulation pipe assembly (3), so as to conduct heat dissipated by the battery cell module (2) through the cooling cavity (11).

2. A battery cooling and heat exchange structure according to claim 1, characterized in that: The cooling chamber (11) comprises an inlet (111), a return port (112) and a cooling channel (113); the circulation pipe assembly (3) comprises an inlet pipe (31) connected to the inlet (111) and a return pipe (32) connected to the return port (112); the coolant flows through the inlet pipe (31), passes through the cooling channel (113), and then flows out to the return pipe (32).

3. A battery cooling and heat exchange structure according to claim 2, characterized in that: The battery core module (2) is in the form of a rectangular parallelepiped structure, and the battery box (1) is in the form of a hollow rectangular parallelepiped structure.

4. A battery cooling and heat exchange structure according to claim 2, characterized in that: The cooling cavity (11) is in a rectangular parallelepiped structure, and a partition bar (12) is arranged transversely in the cooling cavity (11) so that the cooling cavity (11) forms an annular cooling channel (113), the inlet (111) and the return port (112) are located on the same side of the cooling channel (113), and the inlet (111) is located above the return port (112).

5. A battery cooling and heat exchange structure according to claim 2, characterized in that: The two opposite side walls of the battery case (1) are each provided with the cooling chamber (11); the two inlet pipes (31) respectively connected to the two cooling chambers (11) are respectively connected to the inlet main pipe (33); the two return pipes (32) respectively connected to the two cooling chambers (11) are respectively connected to the return main pipe (34); the inlet main pipe (33) and the return main pipe (34) respectively pass through the battery case (1) and are connected to a battery coolant circulation device.

6. A battery cooling and heat exchange structure according to claim 5, characterized in that: The two inlet pipes (31) are arranged in a straight line and are perpendicular to the inlet main pipe (33), and the two return pipes (32) are arranged in a straight line and are perpendicular to the return main pipe (34).

7. A battery cooling and heat exchange structure according to claim 6, characterized in that: The two inlet pipes (31) and the inlet main pipe (33), and the two return pipes (32) and the return main pipe (34) are all connected via a tee pipe.

8. The battery cooling and heat exchange structure according to claim 1, characterized in that: The bottom surface of the battery core module (2) is bonded with a heat-conducting structural adhesive layer (4).

9. The battery cooling and heat exchange structure according to claim 1, characterized in that: The insulating heat-conducting liquid includes fluorinated liquid or silicone oil.

10. The battery cooling and heat exchange structure according to claim 1, characterized in that: The cooling liquid includes water or ethylene glycol.

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