An immersion liquid-cooled battery cell assembly with a built-in cooling structure

Abstract

The utility model relates to the technical field of thermal management of battery cells, and in particular to an immersion-type liquid-cooled battery cell group with a built-in cooling structure. It comprises a battery cell box, wherein a box cavity for storing a battery cell group is arranged in the battery cell box, the box cavity is filled with insulating coolant, a battery cell group is arranged in the box cavity, and the battery cell group is immersed in the insulating coolant for cooling; a cooling channel is arranged in the side wall of the battery cell box, a flowing cooling medium is arranged in the cooling channel, and the cooling medium in the cooling channel can exchange heat with the insulating coolant in the box cavity. The utility model improves the heat dissipation effect of the battery cell group by using the cooling medium flowing in the side wall of the battery cell box, avoids the problem of poor heat dissipation in the dead zone of the flow, thereby improving the temperature uniformity of the battery cell module, reducing the temperature rise of the battery cell, increasing the energy density of the battery cell, and greatly reducing the risk of thermal runaway of the battery cell group.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core thermal management, in particular to an immersion type liquid-cooled battery core group with a built-in cooling structure. Background Art

[0002] The battery cell module generally adopts immersion liquid cooling, which is to immerse the battery cell module in insulating coolant such as fluorinated liquid, and dissipate the heat of the battery cell by direct contact between the battery cell module and the coolant.

[0003] In the prior art, the immersion cooling method of the battery cell has some defects. It treats the entire battery pack as a space for containing fluid. In this case, a clearly divided flow path cannot be formed inside the battery pack, which may lead to insufficient flow of the coolant, thereby generating dead zones where heat accumulates inside the battery pack. Such structural shortcomings make it impossible to effectively dissipate heat in certain areas of the battery pack, especially the batteries in the dead zones, which can easily cause uneven temperature distribution inside the battery pack and increase the possibility of thermal runaway. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technology, the present application provides an immersion liquid-cooled battery cell group with a built-in cooling structure, which improves the heat dissipation effect of the battery cell group by flowing a cooling medium built into the side wall of the battery cell box, avoids the problem of poor heat dissipation in dead zones of flow, thereby improving the temperature uniformity of the battery cell module and greatly reducing the risk of thermal runaway of the battery cell group.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An immersed liquid-cooled battery cell group with a built-in cooling structure comprises a battery cell box, wherein a box cavity for storing the battery cell group is arranged in the battery cell box, the box cavity is filled with insulating coolant, the battery cell group is arranged in the box cavity, and the battery cell group is immersed in the insulating coolant for cooling; a cooling channel is arranged in the side wall of the battery cell box, a flowing cooling medium is arranged in the cooling channel, and the cooling medium in the cooling channel can exchange heat with the insulating coolant in the box cavity.

[0007] Furthermore, the insulating coolant is fluorinated liquid or silicone oil.

[0008] Furthermore, the fixed end face of the battery cell group is fixed to the bottom end face of the box cavity by means of a thermally conductive structural adhesive, and the thermally conductive structural adhesive can conduct the heat generated at the fixed end face of the battery cell group to the bottom end face of the box cavity.

[0009] Furthermore, the battery cell group includes a plurality of battery cell units, and the plurality of battery cell units are evenly distributed in the box cavity in the form of multiple rows and columns, and a heat dissipation gap is set between two adjacent battery cell units in each row or column, and insulating coolant can pass through the heat dissipation gap.

[0010] Furthermore, the cooling medium may be a coolant or cold air, and the coolant may be water or ethylene glycol.

[0011] Furthermore, the cooling channel includes two cooling chambers, and the two cooling chambers are respectively arranged in the left and right side walls of the battery box.

[0012] Furthermore, a partition plate is arranged in the center of the cooling cavity, and the partition plate divides the cooling cavity into two parts, an upper part and an lower part.

[0013] Furthermore, the cooling channel is connected to a circulation pipeline, and the circulation pipeline can introduce a cooling medium with a lower temperature into the cooling channel, and guide the cooling medium after heat exchange out of the cooling channel.

[0014] Furthermore, a circulation pipeline is arranged in the battery cell case, and the circulation pipeline includes a cooling medium inlet pipe and a cooling medium outflow pipe which are arranged in parallel up and down, the cooling medium inlet pipe and the cooling medium outflow pipe are immersed in the insulating coolant, the cooling medium in the cooling medium inlet pipe and the cooling medium outflow pipe can exchange heat with the insulating coolant, both ends of the cooling medium inlet pipe are respectively connected to the cooling cavity, the middle part of the cooling medium inlet pipe is connected to one end of the inlet pipe, the other end of the inlet pipe passes through the side wall of the battery cell case and extends out of the battery cell case, both ends of the cooling medium outflow pipe are respectively connected to the cooling cavity, the middle part of the cooling medium outflow pipe is connected to one end of the outlet pipe, the other end of the outlet pipe passes through the side wall of the battery cell case and extends out of the battery cell case.

[0015] Furthermore, the cooling medium inflow pipe and the cooling chamber connection port are located above the partition plate, and the cooling medium outflow pipe and the cooling chamber connection port are located below the partition plate.

[0016] The beneficial effects of the utility model are as follows:

[0017] The utility model improves the heat dissipation effect of the battery cell group by a cooling medium flowing in the side wall of the battery cell box, avoids the problem of poor heat dissipation in the dead zone of the flow, thereby improving the temperature uniformity of the battery cell module, reducing the temperature rise of the battery cell, increasing the energy density of the battery cell, and greatly reducing the risk of thermal runaway of the battery cell group; the fixed end face of the battery cell group of the utility model is fixed to the bottom end face of the box cavity by a heat-conductive structural adhesive, thereby improving the heat dissipation effect of the fixed end face of the battery cell group and avoiding excessive heat at the fixed end face of the battery cell group; a heat dissipation gap is set between the battery cell units of the utility model, and an insulating coolant can pass through the heat dissipation gap to conduct the heat inside the battery cell group to the outside, thereby improving the heat dissipation effect inside the battery cell group and improving the temperature uniformity of the battery cell; the utility model connects a circulation pipeline to the cooling channel, and the circulation pipeline can achieve the circulation heat dissipation effect of the cooling medium, thereby ensuring the continuity of the overall heat dissipation of the battery cell group. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the utility model.

[0019] Figure 2 This is a structural diagram of the battery pack of the utility model.

[0020] Figure 3 It is a top view of the utility model.

[0021] Figure 4 for Figure 3 Middle AA section view.

[0022] Figure 5 for Figure 3 Middle BB section view.

[0023] Figure 6 for Figure 3 Middle CC section view.

[0024] Among them: 1. Battery box; 2. Battery group; 3. Cooling medium inlet pipe; 4. Cooling medium outflow pipe; 5. Inlet pipe; 6. Outlet pipe; 7. Thermal conductive structural adhesive; 8. Battery unit; 9. Heat dissipation gap; 10. Cooling cavity; 11. Partition. DETAILED DESCRIPTION

[0025] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, an immersion liquid-cooled battery cell group with a built-in cooling structure includes a battery cell box 1, a box cavity for storing a battery cell group 2 is arranged in the battery cell box 1, and the box cavity is filled with insulating coolant. The battery cell group 2 is arranged in the box cavity, and the battery cell group 2 is immersed in the insulating coolant for cooling.

[0027] The insulating coolant generally uses fluorinated liquid, and silicone oil can also be used. The insulating coolant is in contact with the outer surface of the battery group 2. The heat generated by the battery group 2 during operation is transferred to the insulating coolant and taken away by the insulating coolant, thereby achieving cooling of the battery group 2. Insulating coolants such as fluorinated liquid are used as a heat transfer medium. Because the physical properties of the insulating coolant such as thermal conductivity and specific heat capacity are much higher than those of air, immersing the battery group 2 in the insulating coolant can achieve better heat exchange effect.

[0028] like Figure 2 As shown, the fixed end face of the battery cell group 2 is glued to the bottom end face of the box cavity by the thermal conductive structural adhesive 7. The fixed end face of the battery cell group 2 cannot contact the insulating coolant, which will affect the heat dissipation effect. The thermal conductive structural adhesive 7 can conduct the heat generated at the fixed end face position of the battery cell group 2 to the bottom end face of the box cavity, thereby improving the heat dissipation effect of the fixed end face of the battery cell group 2 and avoiding excessive heat at the fixed end face position of the battery cell group 2.

[0029] like Figure 2As shown, the battery pack 2 includes a plurality of battery cells 8, and the plurality of battery cells 8 are evenly distributed in the box cavity in the form of multiple rows and columns. In order to ensure the heat dissipation effect inside the battery pack 2, a heat dissipation gap 9 is set between two adjacent battery cells 8 in each row or column, and the heat dissipation gap 9 can pass through the insulating coolant.

[0030] The battery pack 2 can use battery cells with different structures such as cylindrical battery cells or elongated battery cells. According to the different structures of the battery cells 8 in the battery pack 2, the battery boxes 1 with different structural shapes are adaptively arranged. Figure 1 As shown, the battery cell unit 8 is a long strip structure, the battery cell box 1 is a rectangular parallelepiped structure, and the box cavity is a rectangular parallelepiped structure cavity.

[0031] like Figure 1 and Figure 3 As shown, a cooling channel is provided in the side wall of the battery box 1, and a flowing cooling medium is provided in the cooling channel. The cooling medium in the cooling channel can quickly exchange heat with the insulating coolant in the box cavity. The heat generated by the battery group 2 is first dissipated into the insulating coolant, and then conducted by the insulating coolant to the cooling medium in the cooling channel, and then the cooling medium takes the heat out of the battery box 1 to achieve rapid cooling. The cooling medium can be a coolant or cold air, and the coolant can be water or ethylene glycol.

[0032] like Figure 3 , Figure 5 and Figure 6 As shown, the cooling channel includes two cooling chambers 10, which are respectively arranged in the left and right side walls of the battery box 1. A partition plate 11 is arranged in the center of the cooling chamber 10, and the partition plate 11 divides the cooling chamber 10 into two parts, an upper part and a lower part, thereby forming a loop for the circulation of the cooling medium.

[0033] like Figure 1 and Figure 3 As shown, the cooling channel is connected to a circulation pipeline, which can introduce a cooling medium with a lower temperature into the cooling channel and guide the cooling medium out of the cooling channel after heat exchange, thereby ensuring the heat dissipation effect of the cooling channel.

[0034] like Figure 3 and Figure 4As shown, the circulation pipeline is arranged in the battery box 1, and the circulation pipeline includes a cooling medium inflow pipe 3 and a cooling medium outflow pipe 4 which are arranged in parallel in the battery box 1 from top to bottom. The cooling medium inflow pipe 3 and the cooling medium outflow pipe 4 are immersed in the insulating coolant, and the cooling medium in the cooling medium inflow pipe 3 and the cooling medium outflow pipe 4 can exchange heat with the insulating coolant. The two ends of the cooling medium inflow pipe 3 are respectively connected to the cooling cavity 10, and the connection between the cooling medium inflow pipe 3 and the cooling cavity 10 is located above the partition plate 11. The middle part of the cooling medium inflow pipe 3 is connected to one end of the inlet pipe 5, and the other end of the inlet pipe 5 passes through the side wall of the battery box 1 and extends out of the battery box 1. The other end of the inlet pipe 5 can be connected to the cooling mechanism arranged outside the battery box 1. The two ends of the cooling medium outflow pipe 4 are respectively connected to the cooling cavity 10, and the connection between the cooling medium outflow pipe 4 and the cooling cavity 10 is located below the partition plate 11. The middle of the cooling medium outflow pipe 4 is connected to one end of the outlet pipe 6 , and the other end of the outlet pipe 6 passes through the side wall of the battery box 1 and extends out of the battery box 1 . The other end of the outlet pipe 6 can be connected to a cooling mechanism arranged outside the battery box 1 .

[0035] The circulation pipeline can also be arranged outside the battery box 1. When the circulation pipeline is arranged outside the battery box 1, the cooling medium inlet pipe 3 and the cooling medium outlet pipe 4 do not directly exchange heat with the insulating coolant, and the insulating coolant only relies on the cooling channel to dissipate heat.

[0036] When in use, the cooling mechanism outside the battery box 1 can realize the re-cooling of the cooling medium. The cooling medium enters the upper part of the cooling cavity 10 on the left and right side walls of the battery box 1 through the cooling medium inlet pipe 3, then flows to the lower part along the cooling cavity 10, and finally flows back to the cooling medium outlet pipe 4. The outlet pipe 6 guides the cooling medium after heat exchange to the external cooling mechanism for cooling and recycling. During the flow of the cooling medium in the cooling cavity 10, the heat exchange with the insulating coolant at various positions in the box cavity is realized, which improves the heat dissipation effect of the insulating coolant at various positions in the box cavity, thereby avoiding the problem of poor heat dissipation in the dead zone of the flow, thereby improving the temperature uniformity of the battery module and reducing the risk of thermal runaway of the battery module.

[0037] The utility model improves the heat dissipation effect of the insulating coolant at various positions in the box cavity by arranging cooling channels in the side walls of the battery box 1, thereby avoiding the problem of poor heat dissipation in the flow dead zone, thereby improving the temperature uniformity of the battery module and reducing the risk of thermal runaway of the battery module.

[0038] The working principle of the utility model is: when the battery module is in use, the heat emitted by the battery cell group 2 is dissipated into the insulating coolant, wherein the heat on the outer side of the battery cell group 2 is dissipated into the insulating coolant, and the heat emitted by the battery cell unit 8 inside the battery cell group 2 is absorbed by the insulating coolant flowing in the heat dissipation gap 9 and transferred to the insulating coolant on the outer side of the battery cell group 2. The physical properties of the insulating coolant such as thermal conductivity and specific heat capacity are much higher than those of air, so immersing the battery cell group 2 in the insulating coolant can obtain a better heat exchange effect. Then, the cooling medium flowing in the cooling channel in the side wall of the battery cell box 1 exchanges heat with the insulating coolant at various positions, and the heat of the insulating coolant is taken away in time by the flowing cooling medium, thereby significantly improving the heat transfer effect. The cooling medium in the cooling channel dissipates heat and cools the insulating heat-conducting liquid, which can not only solve the problem of flow dead zone, 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 group 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.

Claims

1. An immersion liquid-cooled battery cell assembly with a built-in cooling structure, comprising a battery cell box (1), characterized in that: The battery box (1) is provided with a box cavity for storing the battery group (2), the box cavity is filled with insulating coolant, the battery group (2) is arranged in the box cavity, and the battery group (2) is immersed in the insulating coolant for cooling; A cooling channel is arranged in the side wall of the battery box (1), a flowing cooling medium is arranged in the cooling channel, and the cooling medium in the cooling channel can exchange heat with the insulating cooling liquid in the box cavity.

2. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 1, characterized in that: The insulating coolant is fluorinated liquid or silicone oil.

3. The immersion liquid-cooled battery cell assembly with a built-in cooling structure according to claim 1, characterized in that: The fixed end face of the battery cell group (2) is glued to the bottom end face of the box cavity by means of a heat-conducting structural adhesive (7), and the heat-conducting structural adhesive (7) can conduct the heat generated at the fixed end face of the battery cell group (2) to the bottom end face of the box cavity.

4. The immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 3, characterized in that: The battery cell group (2) comprises a plurality of battery cell units (8), the plurality of battery cell units (8) being evenly distributed in the box cavity in the form of a plurality of rows and columns, a heat dissipation gap (9) being provided between two adjacent battery cell units (8) in each row or column, and an insulating coolant being able to flow through the heat dissipation gap (9).

5. The immersion liquid-cooled battery cell assembly with a built-in cooling structure according to claim 1, characterized in that: The cooling medium may be a cooling liquid or cold air, and the cooling liquid may be water or ethylene glycol.

6. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 5, characterized in that: The cooling channel comprises two cooling chambers (10), and the two cooling chambers (10) are respectively arranged in the left and right side walls of the battery box (1).

7. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 6, characterized in that: A partition plate (11) is arranged at the centre of the cooling chamber (10), and the partition plate (11) divides the cooling chamber (10) into two parts, an upper part and an lower part.

8. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 7, characterized in that: The cooling channel is connected to a circulation pipeline, which can introduce a cooling medium with a lower temperature into the cooling channel and guide the cooling medium out of the cooling channel after heat exchange.

9. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 8, characterized in that: The circulation pipeline is arranged in the battery box (1), and comprises a cooling medium inflow pipe (3) and a cooling medium outflow pipe (4) which are arranged in parallel in an upper and lower direction. The cooling medium inflow pipe (3) and the cooling medium outflow pipe (4) are immersed in the insulating coolant. The cooling medium in the cooling medium inflow pipe (3) and the cooling medium outflow pipe (4) can exchange heat with the insulating coolant. The two ends of the cooling medium inflow pipe (3) are respectively connected to the cooling cavity (10). The middle of the cooling medium inflow pipe (3) is connected to one end of the inlet pipe (5). The other end of the inlet pipe (5) passes through the side wall of the battery box (1) and extends out of the battery box (1). The two ends of the cooling medium outflow pipe (4) are respectively connected to the cooling cavity (10). The middle of the cooling medium outflow pipe (4) is connected to one end of the outlet pipe (6). The other end of the outlet pipe (6) passes through the side wall of the battery box (1) and extends out of the battery box (1).

10. An immersion liquid-cooled battery cell assembly with a built-in cooling structure as claimed in claim 9, characterized in that: The connection port between the cooling medium inflow pipe (3) and the cooling chamber (10) is located above the partition plate (11), and the connection port between the cooling medium outflow pipe (4) and the cooling chamber (10) is located below the partition plate (11).

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