Battery cooling device, battery module, battery system and electric vehicle

Abstract

The utility model relates to a power battery, and provides a battery cooling device, a battery module, a battery system and an electric vehicle in order to solve the problems of battery cell cooling of the power battery and smoke discharge during thermal runaway, the battery cooling device comprises a liquid cooling plate and a CCS integrated busbar, the liquid cooling plate comprises a base plate and a flow channel construction plate which is attached to the base plate in a sealed connection mode. The bottom surface of the flow channel construction plate is provided with a liquid cooling groove which forms a liquid cooling flow channel with the substrate, and the top surface of the flow channel construction plate is provided with a cooling liquid inlet and a cooling liquid outlet; the liquid cooling plate is provided with a plurality of electrode avoiding holes which penetrate through the base plate and the flow channel construction plate at the attaching position, every two electrode avoiding holes which are transversely arranged at intervals in the left-right direction form a group, and the electrode avoiding holes in each group are arranged at equal intervals in the longitudinal direction. According to the utility model, the battery cooling device is arranged at the top of the battery cell of the battery module and is used for cooling and dissipating heat of the battery cell, and meanwhile, the CCS integrated busbar is arranged in the battery cooling device, so that the CCS integrated busbar is convenient to arrange and install.

Description

Technical Field

[0001] The utility model relates to a power battery, and more specifically, to a battery cooling device, a battery module, a battery system and an electric vehicle. Background Art

[0002] An electric vehicle is powered by a battery system, and the battery system includes one or more battery boxes. A single battery box contains multiple battery modules.

[0003] During charging and discharging of the electric vehicle during operation, the battery cells will generate heat. If the temperature of the battery cells is too high, the battery performance will be reduced, and even thermal runaway of the battery cells may be triggered. For the heat generated by the battery during use, it is necessary to cool the battery cells to take away the heat generated by them to ensure the performance of the battery cells and reduce the occurrence of thermal runaway of the battery cells.

[0004] When a battery cell undergoes thermal runaway, high-temperature flue gas and solid particles will be ejected from its explosion-proof valve. In a battery module, if the high-position flue gas and solid particles cannot be discharged to the outside of the battery box in time, the high-temperature flue gas and solid particles will increase the temperature of the battery cells in contact with them, and ultimately lead to their thermal runaway, thereby spreading the thermal runaway to the entire battery module or even the entire battery system.

[0005] Therefore, in an electric vehicle, how to effectively cool the battery cells to reduce the occurrence of thermal runaway and at the same time effectively contain the spread of thermal runaway when individual battery cells undergo thermal runaway is Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is the cooling of the battery cells of the power battery and the containment of thermal runaway, and to provide a battery cooling device, a battery module, a battery system and an electric vehicle.

[0007] The technical solution for the utility model to achieve its purpose is: a battery cooling device, which includes a square liquid cooling plate and a CCS integrated busbar installed on the upper side of the liquid cooling plate; the liquid cooling plate includes a substrate and a flow channel structure plate whose bottom surface is hermetically connected to the substrate; a liquid cooling groove is provided on the bottom surface of the flow channel structure plate, and the edge of the groove opening of the liquid cooling groove is hermetically connected to the substrate to form a liquid cooling flow channel; a coolant inlet and an outlet are respectively provided at both ends of the liquid cooling flow channel on the top surface of the flow channel structure plate; a plurality of electrode avoidance holes penetrating the substrate and the flow channel structure plate at the fitting part are provided on the liquid cooling plate, and every two electrode avoidance holes arranged horizontally at intervals are taken as a group, and each group of electrode avoidance holes is arranged at equal intervals in the longitudinal direction.

[0008] In the battery cooling device of the present utility model, smoke inlet holes are provided at the positions between the two holes of each group of electrode avoidance holes on the substrate; a flue groove communicated with each smoke inlet hole is further provided on the bottom surface of the flow channel structure plate, and the edge of the notch of the flue groove is adhesively and sealingly connected with the substrate to form a flue; a smoke exhaust port communicated with the flue is provided on the top surface of the flow channel structure plate. Or the liquid cooling plate further includes a flue cover plate; smoke inlet holes penetrating through the substrate and the flow channel structure plate in an up-and-down and mutually fitting manner are provided at the positions between the two holes of each group of electrode avoidance holes, and a liquid cooling groove is provided between each smoke inlet hole and the electrode avoidance holes on the horizontal two sides, and the two liquid cooling grooves are communicated with each other at one end; the flue cover plate is adhesively and sealingly connected to the top surface of the flow channel structure plate and forms a flue communicated with the smoke inlet hole with the two liquid cooling grooves; a smoke exhaust port communicated with the flue is provided on the flue cover plate.

[0009] In the battery cooling device of the present utility model, there are more than one row of smoke inlet holes arranged, the liquid cooling grooves are communicated with each other at the ends, and the coolant inlet and the coolant outlet are arranged at both ends of the liquid cooling grooves connected end to end.

[0010] In the battery cooling device of the present utility model, one side of the liquid cooling groove adjacent to the corresponding electrode avoidance hole has a liquid cooling groove convex part protruding horizontally towards the gap between the two adjacent electrode avoidance holes. Further, one side of the liquid cooling groove away from the liquid cooling groove convex part has a liquid cooling groove concave part recessed horizontally towards the liquid cooling groove convex part. The center of the liquid cooling groove concave part and the center of the liquid cooling groove convex part are aligned left and right in the horizontal direction.

[0011] The technical solution for the present utility model to achieve its purpose is: a battery module, including a module box body, a module box cover arranged on the module box body, and a plurality of battery cells arranged in the module box body. Additionally, it includes the aforementioned battery cooling device. The battery cooling device is in the module box body and located on the top of each battery cell. Each smoke inlet hole on the battery cooling device corresponds to and is communicated with the explosion-proof valve of each battery cell; each coolant inlet, outlet, and smoke exhaust port are all connected with connectors extending to the outside of the module box body; the positive and negative electrodes of the battery cells are connected to the bus bar through the electrode avoidance holes on the liquid cooling plate.

[0012] The technical solution for the present utility model to achieve its purpose is: a battery system having a plurality of the aforementioned battery modules.

[0013] The technical solution for the present utility model to achieve its purpose is: an electric vehicle having the aforementioned battery system or a plurality of battery modules.

[0014] Compared with the prior art, in the present utility model, the battery cooling device is arranged on the top of the battery cells of the battery module, used for cooling and dissipating heat of the battery cells, and at the same time, the CCS integrated bus bar is arranged therein, which is convenient for the arrangement and installation of the CCS integrated bus bar. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the battery cooling device in Embodiment 1.

[0016] Figure 2 It is an exploded schematic diagram of the battery cooling device in Embodiment 1.

[0017] Figure 3 It is a schematic structural diagram of the liquid cooling plate in Embodiment 1.

[0018] Figure 4 It is an exploded schematic diagram of the liquid cooling plate in Embodiment 1.

[0019] Figure 5 It is a top view of the liquid cooling plate in Embodiment 1.

[0020] Figure 6 It is a schematic structural diagram of the flow channel structure plate in Embodiment 1.

[0021] Figure 7 It is a partially enlarged view of the flow channel structure plate in Embodiment 1.

[0022] Figure 8 It is a partial sectional view of the battery cooling device in Embodiment 1.

[0023] Figure 9 It is a schematic structural diagram of the liquid cooling plate in Embodiment 2.

[0024] Figure 10 It is an exploded schematic diagram of the liquid cooling plate in Embodiment 2.

[0025] Figure 11 It is a schematic structural diagram of the flow channel structure plate in Embodiment 2.

[0026] Figure 12 It is a partial sectional view of the liquid cooling plate in Embodiment 2.

[0027] Figure 13 It is a schematic structural diagram of the battery cooling device in Embodiment 2.

[0028] Figure 14 It is a schematic structural diagram of the battery module in Embodiment 3.

[0029] Figure 15 It is an exploded view of the battery module in Embodiment 3.

[0030] Figure 16 It is a schematic structural diagram of the battery cell in Embodiment 3.

[0031] Figure 17 It is a schematic installation structure diagram of the liquid cooling plate in the battery module in Embodiment 3.

[0032] Figure 18 It is a schematic diagram of an electric vehicle in Embodiment 4.

[0033] Names and serial numbers of components in the figure:

[0034] Liquid cooling plate 100, liquid cooling channel 110, flue 120, electrode avoidance hole 130, liquid cooling joint 111, flue gas joint 121.

[0035] Substrate 10, smoke inlet hole 11, first electrode avoidance hole 12, first flue gas hole 13.

[0036] Flow channel structure plate 20, liquid cooling tank 21, flue tank 22, second electrode avoidance hole 23, coolant inlet 24, coolant outlet 25, smoke exhaust port 26, liquid cooling tank protrusion 27, liquid cooling tank depression 28, second flue gas hole 29.

[0037] Flue cover plate 30.

[0038] Battery module 200, module box body 210, module box cover 220, flue gas sealing ring 250.

[0039] Cell 230, explosion-proof valve 231, cell positive electrode 232, cell negative electrode 233.

[0040] CCS integrated busbar 240, information acquisition circuit board 241, busbar 242, voltage acquisition chip 243.

[0041] Battery system 300, controller 400, motor 500. Specific implementation manners

[0042] The following describes the specific implementation manners with reference to the accompanying drawings.

[0043] Embodiment 1.

[0044] Figures 1 to 7 The structure of the battery cooling device in Embodiment 1 is shown.

[0045] As Figure 1 Figure 2 shown, the battery cooling device includes a square liquid cooling plate 100 and a CCS integrated busbar 240 installed on the upper side of the liquid cooling plate 100.

[0046] As Figure 3 Figure 4As shown, the liquid cooling plate 100 is square-shaped and includes a substrate 10 and a flow channel structure plate 20 whose bottom surface is hermetically connected to the substrate 10. A liquid cooling groove 21 is provided on the bottom surface of the flow channel structure plate 20, and the groove edge of the liquid cooling groove 21 is hermetically connected to the substrate 10 to form a liquid cooling flow channel 110; a coolant inlet 24 and a coolant outlet 25 are respectively provided at both ends of the liquid cooling flow channel 110 on the top surface of the flow channel structure plate 20; a plurality of electrode avoidance holes 130 penetrating through the substrate 10 and the flow channel structure plate 20 at the fitting part are provided on the liquid cooling plate 100, and every two electrode avoidance holes 130 are in a group and arranged horizontally at intervals; each group of electrode avoidance holes is arranged at equal intervals longitudinally.

[0047] A flue 120 can also be provided in the liquid cooling plate 100, as Figure 4 Figure 5 shown, the liquid cooling plate 100 further includes a flue cover plate 30 that jointly forms the flue 120 with the flow channel structure plate 20. A smoke inlet hole 11 penetrating through the mutually attached substrate 10 and the flow channel structure plate 20 is provided at the position between each group of electrode avoidance holes 130. A liquid cooling groove 21 is provided between the smoke inlet hole 11 and the electrode avoidance holes 130 on both lateral sides, and the two liquid cooling grooves 21 are communicated with each other at one end; the flue cover plate 30 is hermetically connected to the flow channel structure plate 20 and forms a flue 120 communicated with the smoke inlet hole 11 with the two liquid cooling grooves 21, and a smoke exhaust port 26 communicated with the flue 120 is provided on the flue cover plate 30. Liquid cooling joints 111 are installed at both the coolant inlet 24 and the coolant outlet 25, and a smoke joint 121 is installed at the smoke exhaust port 26.

[0048] As Figure 4 shown, two columns of first smoke holes 13 arranged longitudinally in a columnar shape are provided on the substrate 10. Corresponding to each first smoke hole 13, a first electrode avoidance hole 12 is provided on each of the two sides in the lateral direction of the first smoke hole 13.

[0049] As Figure 6 shown, the flow channel structure plate 20 is a metal plate, and the liquid cooling groove 21 with the groove opening located at the bottom surface is formed by stamping. When the flow channel structure plate 20 is attached to the substrate 10, the liquid cooling groove 21 and the substrate 10 form the liquid cooling flow channel 110.

[0050] A flue groove 22 with the groove opening facing upward is formed at the position between the two liquid cooling grooves 21 on the top surface of the flow channel structure plate 20. The flue cover plate 30 is hermetically connected to the top surface of the flow channel structure plate 20 and covers the groove opening of the flue groove 22. The flue cover plate 30 and the flue groove 22 jointly form the flue 120, and the smoke exhaust port 26 is provided on the flue cover plate 30.

[0051] A plurality of second flue gas holes 29 are provided at the bottom of the flue duct groove 22. When the flow channel structure plate 20 is attached to the base plate 10, the second flue gas holes 29 and the first flue gas holes 13 on the base plate 10 are in one-to-one correspondence and coaxially aligned to form a flue gas inlet hole 11 penetrating through the base plate 10 and the flow channel structure plate 20.

[0052] Corresponding to each first electrode avoidance hole 12 on the base plate 10, there is a second electrode avoidance hole 23 on the flow channel structure plate 20. When the flow channel structure plate 20 is attached and connected to the base plate 10, the first electrode avoidance holes 12 and the second electrode avoidance holes 23 are in one-to-one correspondence and coaxially aligned and communicated to form an electrode avoidance hole 130 penetrating through the liquid cooling plate.

[0053] As Figure 6 Figure 7 As shown, on the side of the liquid cooling tank 21 adjacent to the corresponding second electrode avoidance hole 23, there is a liquid cooling tank protruding portion 27 protruding laterally into the gap between two adjacent second electrode avoidance holes 23. The setting of the liquid cooling tank protruding portion 27 makes the liquid cooling flow channel 110 bend towards the gap between two adjacent second electrode avoidance holes 23, so that the area covered by the liquid cooling flow channel 110 on the base plate 10 is larger, facilitating better heat exchange between the coolant in the liquid cooling flow channel 110 and the base plate 10, thereby improving the cooling efficiency.

[0054] On the side of the liquid cooling tank 21 far from the liquid cooling tank protruding portion 27, there is a liquid cooling tank recessed portion 28 recessed laterally towards the liquid cooling tank protruding portion 27. The center of the liquid cooling tank recessed portion 28 and the center of the liquid cooling tank protruding portion 27 are aligned left and right in the lateral direction. The setting of the liquid cooling tank recessed portion 28 is used to change the flow direction of the coolant in the liquid cooling tank 21, so that the coolant flows towards the liquid cooling tank protruding portion 27 at this position, so that the coolant in each part of the liquid cooling flow channel 110 flows evenly.

[0055] As Figure 1 Figure 8 As shown, the CCS integrated busbar 240 includes an information acquisition circuit board 241, a busbar 242, and a voltage acquisition chip 243. The information acquisition circuit board 241 and the busbar 242 are arranged above the liquid cooling plate 100. Both ends of the busbar 242 are located above two adjacent electrode avoidance holes 130 in the longitudinal direction and are used to connect the positive and negative electrodes of adjacent battery cells. The voltage acquisition chip 243 is electrically connected to the information acquisition circuit board 241 and the busbar 242 to collect the voltage data of each battery cell 230.

[0056] In the battery cooling device of this embodiment, a flue 120 and a liquid cooling channel 110 are integrated in the liquid cooling plate 100, and a CCS integrated busbar 240 is installed. The battery cooling device is installed in the battery module. When the battery cell 230 has a thermal runaway and ejects high-temperature flue gas, the flue 120 can guide the high-temperature flue gas out of the battery module to prevent the spread of the thermal runaway of the battery cell. The flue 120, the liquid cooling channel 110, and the CCS integrated busbar 240 are integrated in the battery cooling device, with a compact structure, which is convenient for layout and installation.

[0057] Embodiment 2.

[0058] Figures 9 to 12 The structure of the liquid cooling plate 100 of the battery cooling device in Embodiment 2 is shown.

[0059] In this embodiment, compared with Embodiment 1, the battery cooling device is different in the liquid cooling plate 100. As Figure 9 Figure 10 shown, the liquid cooling plate 100 includes a substrate 10 and a flow channel structure plate 20 whose bottom surface is hermetically connected to the substrate 10 in a fitting manner.

[0060] As Figure 11 shown, through stamping, the flow channel structure plate 20 is provided with liquid cooling grooves 21 and flue grooves 22 on its bottom surface that jointly form corresponding liquid cooling channels 110 and flues 120 with the substrate 10; a coolant inlet 24, a coolant outlet 25, and a smoke exhaust port 26 are arranged on the flow channel structure plate 20.

[0061] As Figure 10 shown, a smoke inlet hole 11 communicating with the flue 120 is arranged on the substrate 10, and the smoke inlet holes 11 are arranged longitudinally in a columnar shape. Figure 10 There are two columns of smoke inlet holes 11 arranged on the substrate 10 as shown in. The smoke inlet holes 11 in the same column are arranged at equal intervals. Corresponding to the two columns of smoke inlet holes 11, there are two flue grooves 22 on the flow channel structure plate 20, and a smoke exhaust port 26 is arranged on each flue groove 22. When space permits, the two flue grooves 22 can be communicated with each other.

[0062] As Figure 10 shown, a first electrode avoidance hole 12 is arranged on each side of each smoke inlet hole 11 in the transverse direction, and one column of smoke inlet holes 11 corresponds to two columns of first electrode avoidance holes 12. Corresponding to each first electrode avoidance hole 12, there is a second electrode avoidance hole 23 on the flow channel structure plate 20. When the flow channel structure plate 20 is connected to the substrate 10 in a fitting manner, the first electrode avoidance hole 12 and the second electrode avoidance hole 23 are coaxially aligned and communicated to form an electrode avoidance hole 130 penetrating the liquid cooling plate.

[0063] As Figure 10As shown, corresponding to one flue duct groove 22, two liquid cooling grooves 21 are arranged on the flow channel structure plate 20. The two liquid cooling grooves 21 are arranged on both sides in the transverse direction of the flue duct groove 22 and communicate with each other at one end. The liquid cooling grooves 21 are located between the second electrode avoidance hole column and the flue duct groove 22. The four liquid cooling grooves 21 on the flow channel structure plate 20 are connected end to end in sequence, and the coolant inlet 24 and the coolant outlet 25 are respectively arranged at both ends of the liquid cooling grooves 21 after end-to-end connection.

[0064] In other embodiments, the smoke inlet hole 11 can be a column, the corresponding flue duct groove 22 is one, and the liquid cooling grooves 21 are two. The two liquid cooling grooves 21 communicate at one end, and the coolant inlet 24 and the coolant outlet 25 are respectively arranged at the other ends of the two liquid cooling grooves 21.

[0065] The substrate 10 is a metal plate, which is convenient for heat transfer and heat absorption. The flow channel structure plate 20 is a metal plate, and the liquid cooling grooves 21 and the flue duct grooves 22 are formed by stamping. As Figure 12 shown, the openings of the liquid cooling grooves 21 and the flue duct grooves 22 are located on the bottom surface of the flow channel structure plate 20 (the surface that fits with the substrate). After the flow channel structure plate 20 is hermetically connected to the substrate 10, the edges of the openings of the liquid cooling grooves 21 and the flue duct grooves 22 fit with the substrate 10 to be sealed, thereby forming the liquid cooling flow channel 110 and the flue duct 120.

[0066] As Figure 13 shown, the CCS integrated busbar 240 includes an information acquisition circuit board 241, a busbar 242, and a voltage acquisition chip 243. The information acquisition circuit board 241 and the busbar 242 are arranged above the liquid cooling plate 100. Both ends of the busbar 242 are located above two adjacent electrode avoidance holes 130 in the longitudinal direction and are used to connect the positive and negative electrodes of adjacent battery cells. The voltage acquisition chip 243 is electrically connected to the information acquisition circuit board 241 and the busbar 242 to collect the voltage data of each battery cell 230.

[0067] In the battery cooling device of this embodiment, the liquid cooling grooves 21 and the flue duct grooves 22 are formed by stamping the flow channel structure plate 20, which fits with the substrate 10, and at the same time forms the liquid cooling flow channel 110 and the flue duct 120, and its structure is simpler.

[0068] Embodiment Three.

[0069] Figures 14 to 17 Shows the structure of the battery module 200 in Embodiment Three.

[0070] As Figure 14 and Figure 15 shown, the battery module 200 includes a module box body 210, a module cover plate 220 that cooperates with the module box body 210, a plurality of battery cells 230 installed in the module box body, and a battery cooling device.

[0071] AsFigure 15 As shown, two rows of battery cells 230 are arranged in the module housing 210 with the top surfaces of the battery cells 230 facing upward. As Figure 16 shown, an explosion-proof valve 231 is provided in the middle of the top surface of the battery cell 230. On both sides of the explosion-proof valve 231 are the battery cell positive electrode 232 and the battery cell negative electrode 233 respectively. When the battery cells 230 are arranged in the module housing 210, the explosion-proof valves 231 of the battery cells 230 are arranged in a columnar pattern at equal intervals, and the battery cell positive electrodes 232 and the battery cell negative electrodes 233 are also arranged in a columnar pattern at equal intervals respectively.

[0072] As Figure 15 shown, the battery cooling device is installed in the module housing 210. Among them, the liquid cooling plate 100 is installed on the top of each battery cell 230, and the CCS integrated busbar 240 is arranged on the top surface of the liquid cooling plate 100.

[0073] As Figure 17 shown, the liquid cooling plate 100 is arranged on the top of the battery cell 230. The smoke inlet holes 11 at the bottom of the smoke duct 120 are connected to the explosion-proof valves 231 on the battery cells 230 one by one. A smoke duct sealing ring 250 is provided at the connection part. The smoke duct 120 is communicated with the explosion-proof valves 231 of each battery cell 230 through the smoke inlet holes 11.

[0074] The CCS integrated busbar 240 includes an information acquisition circuit board 241, a busbar 242, and a voltage acquisition chip 243. The information acquisition circuit board 241 and the busbar 242 are arranged above the liquid cooling plate 100. The battery cell positive electrode 232 and the battery cell negative electrode 233 protrude upward through the electrode avoidance holes 130 on the liquid cooling plate 100 respectively. The busbar 242 is electrically connected to the battery cell positive electrode 232 and the battery cell negative electrode 233 to connect the battery cells 230 in series. The voltage acquisition chip 243 is electrically connected to the information acquisition circuit board 241 and the busbar 242 to acquire the voltage data of each battery cell 230.

[0075] In this embodiment, the battery cooling device is the battery cooling device in Embodiment 1. In other embodiments, it may also be the battery cooling device in Embodiment 2.

[0076] As Figure 14 shown, the liquid cooling joint 111 on the liquid cooling plate 100 extends to the outside of the module housing 210 and is connected to the battery cooling system. When the battery module 200 is charging and discharging, the battery cooling system delivers coolant to the liquid cooling plate 100 to cool the electromagnetic module. The smoke gas joint 121 extends to the outside of the module housing 210. When a certain battery cell in the battery module 200 undergoes thermal runaway, the high-temperature smoke gas of its spray valve is guided to the outside of the module housing 210 to prevent the adjacent battery cells 230 from being affected.

[0077] This embodiment also provides a battery system, which has at least one of the above-mentioned battery modules 200.

[0078] Embodiment 4

[0079] Figure 18 The electric vehicle in Embodiment 4 is shown.

[0080] The electric vehicle includes a battery system 300, and the battery system 300 includes at least one battery module 200 in Embodiment 3. The electric vehicle can be construction machinery, such as a loader, an excavator, etc., or a road vehicle, such as a truck, a bus, etc.

[0081] Such as Figure 18 As shown, the battery system 300 is electrically connected to the motor 500 through a controller 400 to provide driving power for the motor 500.

[0082] In the present utility model, the flue 120, the liquid cooling channel 110 and the CCS integrated bus bar 240 are integrated together, making the whole structure simple and convenient for layout and installation.

Claims

1. A battery cooling device, characterized in that, It includes a square liquid cooling plate and a CCS integrated busbar installed on the upper side of the liquid cooling plate; the liquid cooling plate includes a substrate and a flow channel structure plate whose bottom surface is hermetically connected to the substrate; a liquid cooling groove is provided on the bottom surface of the flow channel structure plate, and the edge of the groove opening of the liquid cooling groove is hermetically connected to the substrate to form a liquid cooling flow channel; a coolant inlet and an outlet are respectively provided on the top surface of the flow channel structure plate and at both ends of the liquid cooling flow channel; a plurality of electrode avoidance holes penetrating the substrate and the flow channel structure plate at the fitting part are provided on the liquid cooling plate, and every two electrode avoidance holes arranged horizontally at intervals are taken as a group, and each group of electrode avoidance holes is arranged at equal intervals in the longitudinal direction.

2. The battery cooling device according to claim 1, characterized in that Smoke inlet holes are provided on the substrate at the positions between the two holes of each group of electrode avoidance holes; a flue channel groove communicated with each smoke inlet hole is further provided on the bottom surface of the flow channel structure plate, and the edge of the groove opening of the flue channel groove is hermetically connected to the substrate to form a flue; a smoke exhaust port communicated with the flue is provided on the top surface of the flow channel structure plate.

3. The battery cooling device according to claim 1, characterized in that, The liquid cooling plate further includes a flue cover plate; smoke inlet holes penetrating the mutually attached substrate and the flow channel structure plate up and down are provided at the positions between the two holes of each group of electrode avoidance holes, and a liquid cooling groove is provided between each smoke inlet hole and the electrode avoidance holes on the horizontal two sides, and the two liquid cooling grooves are communicated with each other at one end; the flue cover plate is hermetically connected to the top surface of the flow channel structure plate and forms a flue communicated with the smoke inlet hole with the two liquid cooling grooves; a smoke exhaust port communicated with the flue is provided on the flue cover plate.

4. The battery cooling device according to claim 2 or 3, characterized in that More than one row of the smoke inlet holes are arranged, and the liquid cooling grooves are connected end to end at the ends, and the coolant inlet and the coolant outlet are arranged at both ends of the liquid cooling grooves connected end to end.

5. The battery cooling device according to any one of claims 1 to 3, characterized in that, One side of the liquid cooling groove close to the electrode avoidance hole has a liquid cooling groove convex part protruding horizontally towards the gap between the adjacent two electrode avoidance holes.

6. The battery cooling device according to claim 5, characterized in that, One side of the liquid cooling groove far from the liquid cooling groove convex part has a liquid cooling groove concave part recessed horizontally towards the liquid cooling groove convex part.

7. The battery cooling device according to claim 6, wherein The center of the liquid cooling groove concave part is aligned left and right with the center of the liquid cooling groove convex part in the horizontal direction.

8. A battery module, comprising a module housing, a module cover arranged on the module housing, and a plurality of battery cells arranged in the module housing, wherein, It further includes the battery cooling device according to any one of claims 2 to 7, the battery cooling device is in the module box body and located on the top of each battery cell, and each smoke inlet hole on the battery cooling device is correspondingly communicated with the explosion-proof valve of each battery cell; each coolant inlet, outlet and smoke exhaust port are all connected with joints extending to the outside of the module box body; the positive and negative electrodes of the battery cell are connected to the busbar through the electrode avoidance holes on the liquid cooling plate.

9. A battery system, characterized in that, It has a plurality of battery modules as described in claim 8.

10. An electric vehicle, characterized in that, It has the battery system as described in claim 9, or has a plurality of battery modules as described in claim 8.

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