A power battery module cooling structure

Abstract

The application provides a power battery module cooling structure applied to the technical field of new energy automobile power batteries, wherein a plurality of battery cells (4) of the power battery module cooling structure are arranged on a bottom insulation heat insulation plate (7), a composite heat insulation plate (10) is arranged between every two adjacent battery cells (4), a cooling oil flow channel (1) is arranged on the side surface of the battery cell (4), part of the structure of a busbar (2) on the battery cell (4) extends into the cooling oil flow channel (1) through an opening part on the cooling oil flow channel (1), and a heat conduction sheet (11) is arranged between the side surface of each battery cell (4) and the cooling oil flow channel (1). The power battery module cooling structure can prevent the hidden danger of thermal runaway caused by heat transfer of the busbar after the thermal runaway of the battery cell, can prevent the thermal runaway spreading caused by the contact surface of the adjacent battery cells, can meet the heating and heat dissipation requirements of the power battery, can ensure that the battery cell works in a reasonable temperature range, and can improve the safety of the battery.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle power battery technology, and more specifically, it relates to a power battery module cooling structure. Background Technology

[0002] Power batteries are the power source in new energy vehicles. During use, lithium-ion batteries generate heat due to internal resistance and chemical reactions during charging and discharging, causing the battery cell temperature to rise. If the battery deviates from its suitable operating temperature range, its lifespan and capacity will decrease. A thermal management system is needed to dissipate heat from the individual battery cells in the power battery pack, ensuring the battery operates within a reasonable temperature range. Furthermore, the increased energy density of power batteries, along with their inherent instability, can lead to thermal runaway. Common forms include overcharging, over-discharging, and damage from compression or puncture. When a single cell experiences thermal runaway, the energy it contains is released as heat in a very short time, accompanied by the ejection of a large amount of gas. If appropriate measures are not taken, the heat generated by the thermally runaway cell will quickly transfer to adjacent cells, causing the thermal runaway to spread and potentially leading to a battery pack explosion with serious consequences. According to relevant national standards and regulations, after a battery experiences thermal runaway and issues an alarm to the occupants, at least five minutes should be allowed for occupants to evacuate the vehicle. This presents a significant challenge to thermal control in extreme situations. In thermal management, common methods include air cooling, water cooling, oil cooling, and direct cooling. Air cooling is the cheapest, while water cooling is the most widely used. Air cooling typically uses forced convection, where air is introduced into the battery pack to remove heat. However, due to the low heat transfer coefficient of air convection and the high energy density of power batteries, resulting in high heat generation per unit volume, air cooling is insufficient for some high-energy-density vehicles. Furthermore, in the event of thermal runaway, air cooling has very limited cooling effect on the battery pack. Water cooling uses cold plates laid at the bottom or sides of the battery module, offering excellent temperature control. However, it cannot handle the instantaneous high temperatures (up to 900°C) generated during potential thermal runaway. Direct cooling uses refrigerant from the air conditioning system directly into the battery's cooling pipes, offering advantages such as simple structure and high efficiency. However, it still cannot cope with the high temperatures generated by thermal runaway. One of the most obvious characteristics of thermal runaway in a battery cell is a rapid temperature rise. To prevent the spread of thermal runaway, the temperature of adjacent cells should be prevented from rising above the thermal runaway trigger temperature. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a power battery module cooling structure that is simple in structure, uses oil as a cooling medium, and can prevent the thermal runaway risk caused by heat transfer from the busbar after the cell has thermal runaway; can prevent the thermal runaway from spreading from the contact surface of adjacent cells; and can meet the heating and heat dissipation requirements of the power battery while ensuring that the cells operate within a reasonable temperature range, thereby improving battery safety.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] This invention relates to a cooling structure for a power battery module. The cooling structure includes multiple battery cells, which are mounted on a bottom heat insulation plate. A composite heat insulation plate is provided between each pair of adjacent battery cells. Cooling oil channels are provided on the sides of the battery cells. Part of the busbar 2 on the battery cells extends into the cooling oil channels through openings in the cooling oil channels. Heat-conducting sheets are provided between the side of each battery cell and the cooling oil channels.

[0006] Multiple battery cells are provided with a module end plate at one end and another module end plate at the other end. One end of the cooling oil channel is fitted into the upper notch of one module end plate and the other end of the cooling oil channel is fitted into the upper notch of another module end plate. One end of the cooling oil channel is provided with an oil inlet and the other end of the cooling oil channel is provided with an oil outlet.

[0007] Each of the multiple battery cells has a cooling oil channel on each side. One end of each cooling oil channel is fitted into the upper notch of a module end plate, and the other end of each cooling oil channel is fitted into the upper notch of another module end plate. Heat dissipation ribs are provided on the busbar, and the part of the busbar with heat dissipation ribs extends into the cooling oil channel through the opening on the cooling oil channel.

[0008] Each battery cell is equipped with a battery explosion-proof valve, and multiple battery cells are equipped with exhaust channels. The battery explosion-proof valve of each battery cell is aligned with the air inlet on the exhaust channel, and the opening area of ​​the air inlet is set to be larger than that of the battery explosion-proof valve.

[0009] The heat-conducting sheet is a silicone sheet. The heat-conducting sheet is attached to the side of the battery cell. The heat-conducting sheet attached to the upper part of the battery cell is also attached to the side of the cooling oil channel. The heat-conducting sheet attached to the lower part of the battery cell is also attached to the heat-conducting aluminum plate. The heat-conducting aluminum plate is attached to the bottom of the cooling oil channel.

[0010] A rubber sleeve is provided between the opening on the cooling oil flow channel and the manifold. The rubber sleeve is designed to seal the connection between the opening on the cooling oil flow channel and the manifold.

[0011] Multiple battery cells are connected in parallel or series via a busbar, which has an L-shaped structure.

[0012] Multiple battery cells are equipped with battery cell fixing brackets, which are connected to the module end plate, the box side plate and the cover plate respectively. The battery cell fixing brackets are equipped with exhaust ports.

[0013] The exhaust channel is provided with an exhaust outlet at its end, and the exhaust outlet is a structure composed of multiple rectangular openings.

[0014] The power battery module cooling structure also includes a module housing, multiple composite heat insulation plates and a bottom heat insulation plate forming a semi-enclosed structure with the module housing.

[0015] By adopting the technical solution of the present invention, the following beneficial effects can be obtained:

[0016] The power battery module cooling structure described in this invention presents a novel technical solution. The main innovations of this invention are: 1) A unique oil-cooled thermal management method. a) Unlike immersing the battery module entirely or partially in cooling oil, this solution provides cooling oil channels (cooling oil passages) on the side of the battery cell. b) The side of the cooling oil passage and the upper part of the battery cell side are in good contact through a heat-conducting sheet (which can be a silicone sheet). The lower part of the battery cell side contacts the bottom surface of the cooling oil passage 1 through a heat-conducting aluminum plate, which conducts heat to the cooling oil, ensuring uniform temperature across the battery cell and operation within a suitable temperature range. 2) A heat-conducting and heat-insulating structure capable of handling thermal runaway. a) A composite heat-insulating plate made of heat-insulating material is used to isolate adjacent battery cells, preventing thermal runaway cells from transferring heat to adjacent cells through their outer casing, thus preventing thermal runaway in adjacent cells. b) The portion of the busbar with heat dissipation ribs connecting the battery cells to adjacent cells extends into the cooling oil of the cooling oil passage. Cooling with cooling oil reduces the busbar temperature, effectively preventing heat transfer to adjacent cells. 3) High-temperature combustible gas exhaust channels are provided. Gases generated during cell thermal runaway can be exhausted through pre-reserved exhaust channels. Multiple ribs are installed inside the exhaust channels, dividing them into several independent smaller channels, or exhaust outlets are provided at the ends of the exhaust channels, with the outlets consisting of multiple rectangular openings. This separates the flame and reduces the temperature of the high-temperature combustible gas, eliminating open flames. 4) Unique busbar design. a) L-shaped busbars increase the heat dissipation area. b) Heat dissipation ribs are added to the surface of the busbars to further increase the heat dissipation area. c) A reliable seal is achieved between the busbars and the cooling oil channels using a rubber sealing sleeve, preventing cooling oil leakage and ensuring reliable sealing. The power battery module cooling structure described in this invention is simple in structure and uses oil as the cooling medium. It can prevent the thermal runaway risk caused by heat transfer from the busbar after the cell has thermally runaway; it can prevent the thermal runaway from spreading from the contact surface between adjacent cells; it can meet the heating and heat dissipation requirements of the power battery, and ensure that the cell operates within a reasonable temperature range, thereby improving battery safety. Attached Figure Description

[0017] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0018] Figure 1 This is a schematic diagram of the cooling structure of the power battery module described in this invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the power battery module cooling structure described in this invention;

[0020] Figure 3 This is an exploded structural diagram of the cooling structure of the power battery module described in this invention;

[0021] Figure 4a This is a schematic diagram of the inlet and outlet directions of the cooling oil flow channel in the power battery module cooling structure described in this invention.

[0022] Figure 4b This is a schematic diagram showing another direction of the oil inlet and outlet of the cooling oil channel in the cooling structure of the power battery module described in this invention.

[0023] Figure 5 This is a schematic diagram of the cooling structure of the power battery module described in this invention;

[0024] The labels in the attached diagram are as follows: 1. Cooling oil flow channel; 2. Manifold; 3. Cover plate; 4. Battery cell; 5. Exhaust channel; 6. Module end plate; 7. Bottom heat insulation plate; 8. Thermally conductive aluminum plate; 9. Rubber sleeve; 10. Composite heat insulation plate; 11. Thermal conductive sheet; 12. Insulating sleeve; 13. Battery cell fixing bracket; 14. Upper notch; 15. Oil inlet; 16. Oil outlet; 17. Module housing. Detailed Implementation

[0025] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0026] As attached Figure 1 - Appendix Figure 4bAs shown, this invention is a cooling structure for a power battery module. The cooling structure includes multiple battery cells 4, which are mounted on a bottom heat insulation plate 7. A composite heat insulation plate 10 is positioned between every two adjacent battery cells 4. Cooling oil channels 1 are provided on the sides of the battery cells 4. A portion of the busbar 2 on the battery cells 4 extends into the cooling oil channels 1 through an opening. A heat-conducting sheet 11 is positioned between the side of each battery cell 4 and the cooling oil channel 1. This structure addresses the shortcomings of existing technologies by proposing a novel technical solution. The main innovations of this invention are: 1) A unique oil-cooling thermal management method. a) Unlike immersing the battery module entirely or partially in cooling oil, this solution provides cooling oil channels 1 (cooling oil passages) on the sides of the battery cells 4. b) The sides of the cooling oil channels 1 and the upper part of the sides of the battery cells 4 are in good contact through heat-conducting sheets (which can be silicone sheets). The lower part of the side of the battery cell 4 contacts the bottom surface of the cooling oil channel 1 through the heat-conducting aluminum plate 8. The heat is conducted to the cooling oil through the heat-conducting aluminum plate 8, so that the temperature of each part of the battery cell 4 is uniform and the operation is ensured within a suitable temperature range. 2) A heat-conducting and heat-insulating structure that can cope with thermal runaway. a. The composite heat insulation plate 10 is used to isolate adjacent battery cells 4 from each other to prevent the thermal runaway battery cell 4 from conducting heat to the adjacent battery cell 4 through the battery cell shell, thereby triggering the thermal runaway of the adjacent battery cell. b. The part of the busbar 2 with heat dissipation ribs that connects the battery cell 4 to the adjacent battery cell 4 extends into the cooling oil of the cooling oil channel. The cooling oil can reduce the temperature of the busbar and effectively prevent heat from being transferred to the adjacent battery cell through the busbar. 3) A high-temperature combustible gas emission channel is set. The gas generated when the battery cell is thermally runaway can be discharged through the reserved exhaust channel 5. The exhaust channel 5 is provided with multiple ribs inside, dividing the channel into several independent small channels, or the exhaust channel 5 is provided with an exhaust outlet at the end, and the exhaust outlet is a structure composed of multiple rectangular openings. This design can separate the flame and reduce the temperature of high-temperature combustible gases, eliminating open flames. 4) Unique busbar design. a. The L-shaped busbar 2 increases the heat dissipation area of ​​the busbar 2. b. Heat dissipation fins are added to the surface of the busbar 2 to further increase the heat dissipation area of ​​the busbar. c. A reliable seal is achieved between the busbar 2 and the cooling oil channel through a rubber sleeve, preventing cooling oil leakage and ensuring reliable sealing. The above structure uses oil as the cooling medium to prevent thermal runaway caused by heat transfer from the busbar after the cell experiences thermal runaway; good thermal insulation materials are used to separate the cells to prevent the spread of thermal runaway caused by the contact surface between adjacent cells; the oil cooling method on the battery module side can meet the heating and heat dissipation requirements of the power battery and ensure that its cells operate within a reasonable temperature range.

[0027] Multiple battery cells 4 are connected to a module end plate 6 at one end and another module end plate 6 at the other end. A cooling oil channel 1 is fitted at one end of the upper notch 14 of one module end plate 6 and at the other end of the upper notch 14 of the other module end plate 6. The cooling oil channel 1 has an oil inlet 15 at one end and an oil outlet 16 at the other end. In this structure, the oil inlet 15 allows cooling oil to enter and the oil outlet 16 allows cooling oil to flow out, thus achieving cooling oil circulation and reliably cooling the battery cells.

[0028] Multiple battery cells 4 are provided with cooling oil channels 1 on each side. One end of each cooling oil channel 1 is fitted into the upper notch 14 of a module end plate 6, and the other end of each cooling oil channel 1 is fitted into the upper notch 14 of another module end plate 6. A heat dissipation fin is provided on the busbar 2, and the part of the busbar 2 with the heat dissipation fin extends into the cooling oil channel 1 through the opening on the cooling oil channel 1. In this way, cooling oil channels can be provided on both sides of multiple battery cells, and two or more cooling oil channels 1 can be provided on each side depending on the size of the battery cell.

[0029] Each battery cell 4 is equipped with a battery explosion-proof valve, and multiple battery cells 4 are equipped with exhaust channels 5. The battery explosion-proof valve of each battery cell 4 is aligned with the air inlet on the exhaust channel 5, and the opening area of ​​the air inlet is set to be larger than that of the battery explosion-proof valve. In this structure, the exhaust channel 5 is used to allow the high-temperature gas inside the battery cell to be discharged from the cell body through the battery explosion-proof valve and to be discharged from the module in a timely manner through the exhaust channel 5 in the event of thermal runaway.

[0030] The heat-conducting sheet 11 is a silicone sheet. The heat-conducting sheet 11 is adhered to the side of the battery cell 4. The heat-conducting sheet 11 attached to the upper part of the battery cell 4 is also adhered to the side of the cooling oil channel 1. The heat-conducting sheet 11 attached to the lower part of the battery cell 4 is also adhered to the heat-conducting aluminum plate 8. The heat-conducting aluminum plate 8 is adhered to the bottom of the cooling oil channel 1. With this structure, the heat-conducting sheet and the heat-conducting aluminum plate achieve heat transfer quickly and reliably.

[0031] A rubber sleeve 9 is provided between the opening on the cooling oil flow channel 1 and the manifold 2. The rubber sleeve 9 is configured to seal the connection between the opening on the cooling oil flow channel 1 and the manifold 2. In this structure, the rubber sleeve acts as a sealing element, reliably achieving a seal.

[0032] Multiple battery cells 4 are connected in parallel or in series through busbar 2, which has an L-shaped structure.

[0033] Multiple battery cells 4 are provided with battery cell fixing brackets 13, which are respectively connected to the module end plate 6, the box side plate and the cover plate 3, and the battery cell fixing brackets 13 are provided with exhaust ports.

[0034] The exhaust channel 5 is provided with an exhaust outlet at its end, and the exhaust outlet is a structure composed of multiple rectangular openings. In another embodiment, the exhaust channel 5 has multiple ribs inside, dividing the channel into several independent smaller channels. With this structure, in the event of thermal runaway in the battery cell, the exhaust channel 5 can separate the flame and high-temperature gas, reducing the probability of open flame.

[0035] The power battery module cooling structure also includes a module housing 17, multiple composite heat insulation plates 10 and a bottom heat insulation plate 7 forming a semi-enclosed structure with the module housing 17.

[0036] The power battery module cooling structure described in this invention mainly comprises battery cells, cooling oil channels, heat insulation plates, module housings, battery cell mounting brackets, thermally conductive silicone, thermally conductive aluminum plates, exhaust channels, and module end plates, etc. Figure 1 and Figure 2 As shown, the internal structure of the power battery module is illustrated. The battery cells 4 and composite heat insulation plates 10 are arranged alternately. The composite heat insulation plates 10 and the bottom heat insulation plate 7, together with the module housing 17, form a semi-enclosed structure. Cooling oil channels 1 partially seal the L-shaped busbars 2 of the battery cells within the cooling oil channels. Cooling oil channels 1 are connected to the battery pack's main cooling oil pipeline via cooling oil channel interfaces. In the cooling oil channel 1, the cooling medium oil flows in the sealed channel, carrying away the heat generated during the operation of the battery cell, and also carrying away the energy transferred through the busbar when the battery cell experiences thermal runaway, ensuring that adjacent battery cells do not experience thermal runaway. The composite heat insulation plate 10 in the middle of the battery cell and the bottom heat insulation plate 7 prevent the heat source from being isolated when the battery cell experiences thermal runaway, thus preventing thermal runaway of adjacent battery cells. The module has an exhaust channel 5; when a battery cell experiences thermal runaway, high-temperature gas is discharged from the cell through the battery explosion-proof valve and through the exhaust channel 5, allowing the high-temperature gas to be discharged from the module in a timely manner. The exhaust channel is designed with an air inlet at the bottom, concentric with the battery explosion-proof valve, and the opening is larger than the explosion-proof valve opening. The exhaust channel outlet is a small rectangular exhaust port, which can separate flames and high-temperature gases, reducing the probability of open flame. In this way, the safety of the battery is effectively improved.

[0037] like Figure 3The diagram shows exploded views of components including the module, battery cells, L-shaped busbars, cooling oil channels, rubber sealing sleeves, composite heat insulation plates, thermally conductive silicone sheets, thermally conductive aluminum plates, battery cell mounting brackets, and flexible cable harnesses. Silicone sheets are adhered to the sides of battery cells 4. The upper silicone sheet is adhered to the cooling oil channel 1 to ensure heat transfer to the channel wall; the lower silicone sheet is adhered to the thermally conductive aluminum plate 8, which is also adhered to the bottom surface of the cooling oil channel 1, allowing heat generated at the bottom of the battery to be transferred to the bottom of the channel 1 via the aluminum plate. During normal charging and discharging, the battery generates heat, which is carried away by the cooling oil medium through heat transfer, ensuring the battery operates at a reasonable temperature. Parallel or series connection of battery cells 4 is achieved through L-shaped busbars 2. Part of the busbar 2 is sealed within the cooling oil channels and sealed by rubber sleeves 9 to prevent cooling oil overflow. When a battery cell experiences thermal runaway, a significant portion of the energy is transferred to adjacent cells via the busbar. The busbar directly penetrates the cooling oil, effectively removing heat and preventing thermal runaway from occurring in adjacent cells due to energy transfer through the busbar. The battery cell 4 is secured by the battery cell mounting bracket 13, module end plate 6, housing side plate, and cover plate 3. The battery cell mounting bracket 13 has an exhaust port that communicates with the module cover 3, ensuring timely removal of high-temperature gases from the module. The busbar is welded to the battery cell 4, and the cooling oil channel 1 is fixed to the module end plate 6. Finally, a complete oil-cooled module is assembled.

[0038] Figure 4a and Figure 4b The diagram shows the layout of the cooling oil inlets and outlets. The module has two inlets and two outlets, without distinguishing between the inflow methods. Figure 4a As shown, individual modules can be connected in parallel and then connected in series with other modules. Alternatively, as... Figure 4b As shown, the flow channels of a single module can be connected in series internally before flowing into other modules in series. This achieves the flow of the cooling medium.

[0039] The power battery module cooling structure described in this invention presents a novel technical solution. The main innovations of this invention are: 1) A unique oil-cooled thermal management method. a) Unlike immersing the battery module entirely or partially in cooling oil, this solution provides cooling oil channels (cooling oil passages) on the side of the battery cell. b) The side of the cooling oil passage and the upper part of the battery cell side are in good contact through a heat-conducting sheet (which can be a silicone sheet). The lower part of the battery cell side contacts the bottom surface of the cooling oil passage 1 through a heat-conducting aluminum plate, which conducts heat to the cooling oil, ensuring uniform temperature across the battery cell and operation within a suitable temperature range. 2) A heat-conducting and heat-insulating structure capable of handling thermal runaway. a) A composite heat-insulating plate made of heat-insulating material is used to isolate adjacent battery cells, preventing thermal runaway cells from transferring heat to adjacent cells through their outer casing, thus preventing thermal runaway in adjacent cells. b) The portion of the busbar with heat dissipation ribs connecting the battery cells to adjacent cells extends into the cooling oil of the cooling oil passage. Cooling with cooling oil reduces the busbar temperature, effectively preventing heat transfer to adjacent cells. 3) High-temperature combustible gas exhaust channels are provided. Gases generated during cell thermal runaway can be exhausted through pre-reserved exhaust channels. Multiple ribs are installed inside the exhaust channels, dividing them into several independent smaller channels, or exhaust outlets are provided at the ends of the exhaust channels, with the outlets consisting of multiple rectangular openings. This separates the flame and reduces the temperature of the high-temperature combustible gas, eliminating open flames. 4) Unique busbar design. a) L-shaped busbars increase the heat dissipation area. b) Heat dissipation ribs are added to the surface of the busbars to further increase the heat dissipation area. c) A reliable seal is achieved between the busbars and the cooling oil channels using a rubber sealing sleeve, preventing cooling oil leakage and ensuring reliable sealing. The power battery module cooling structure described in this invention is simple in structure and uses oil as the cooling medium. It can prevent the thermal runaway risk caused by heat transfer from the busbar after the cell has thermally runaway; it can prevent the thermal runaway from spreading from the contact surface between adjacent cells; it can meet the heating and heat dissipation requirements of the power battery, and ensure that the cell operates within a reasonable temperature range, thereby improving battery safety.

[0040] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A cooling structure for a power battery module, characterized in that: The power battery module cooling structure includes multiple battery cells (4), which are arranged on the bottom heat insulation plate (7). A composite heat insulation plate (10) is arranged between each two adjacent battery cells (4). A cooling oil channel (1) is arranged on the side of the battery cell (4). Part of the structure of the busbar (2) on the battery cell (4) extends into the cooling oil channel (1) through the opening on the cooling oil channel (1). A heat-conducting plate (11) is arranged between the side of each battery cell (4) and the cooling oil channel (1). Multiple battery cells (4) are provided with a module end plate (6) at one end and another module end plate (6) at the other end. Cooling oil channels (1) are provided on both sides of the multiple battery cells (4). One end of each cooling oil channel (1) is fitted into the upper notch (14) of a module end plate (6), and the other end of each cooling oil channel (1) is fitted into the upper notch (14) of another module end plate (6). Heat dissipation fins are provided on the busbar (2). The part of the busbar (2) with heat dissipation fins extends into the cooling oil channel (1) through the opening on the cooling oil channel (1). The heat-conducting sheet (11) is a silicone sheet. The heat-conducting sheet (11) is attached to the side of the battery cell (4). The heat-conducting sheet (11) attached to the upper part of the battery cell (4) is also attached to the side of the cooling oil channel (1). The heat-conducting sheet (11) attached to the lower part of the battery cell (4) is also attached to the heat-conducting aluminum plate (8). The heat-conducting aluminum plate (8) is attached to the bottom surface of the cooling oil channel (1). An exhaust channel (5) is provided above multiple battery cells (4), and the battery explosion-proof valve of each battery cell (4) is aligned with the air inlet on the exhaust channel (5); the gas generated when the battery cell (4) thermally runs away is discharged through the reserved exhaust channel (5). Multiple ribs are provided inside the exhaust channel (5) to divide the channel into several independent small channels, or an exhaust outlet is provided at the end of the exhaust channel (5), and the exhaust outlet is a structure composed of multiple rectangular openings.

2. The power battery module cooling structure according to claim 1, characterized in that: The cooling oil channel (1) is provided with an oil inlet (15) at one end and an oil outlet (16) at the other end.

3. The power battery module cooling structure according to claim 1 or 2, characterized in that: Each cell (4) is equipped with a battery explosion-proof valve, and the opening area of ​​the air inlet is set to be larger than that of the battery explosion-proof valve.

4. The power battery module cooling structure according to claim 1 or 2, characterized in that: A rubber sleeve (9) is provided between the opening on the cooling oil channel (1) and the manifold (2). The rubber sleeve (9) is configured to seal the connection between the opening on the cooling oil channel (1) and the manifold (2).

5. The power battery module cooling structure according to claim 1 or 2, characterized in that: Multiple cells (4) are connected in parallel or in series through a busbar (2), which has an L-shaped structure.

6. The power battery module cooling structure according to claim 1 or 2, characterized in that: Multiple battery cells (4) are provided with battery cell fixing brackets (13), which are respectively connected to the module end plate (6), the box side plate and the cover plate (3). Exhaust ports are provided on the battery cell fixing brackets (13).

7. The power battery module cooling structure according to claim 1 or 2, characterized in that: The power battery module cooling structure also includes a module housing (17), multiple composite heat insulation plates (10) and a bottom heat insulation plate (7) forming a semi-enclosed structure with the module housing (17).

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