Cooling system, battery system and electric vehicle

Abstract

The invention discloses a cooling system, a battery system and an electric vehicle, and belongs to the field of batteries. The cooling system is applied to a battery pack and comprises a first cooling assembly and a second cooling assembly, the first cooling assembly and the second cooling assembly are located on the two opposite sides of the battery pack respectively, and the first cooling assembly is located at a tab of the battery pack. The LED lamp can have a good heat dissipation and cooling effect.

Description

Cooling systems, battery systems and electric vehicles Technical Field

[0001] The present application relates to the field of batteries, and in particular to cooling systems, battery systems and electric vehicles. Background Art

[0002] The battery system is a key system in electric vehicles, largely determining their overall performance. Because the battery system generates a large amount of heat during operation and charging, a cooling system is usually configured within the battery system.

[0003] In the related art, a cooling system is configured at the bottom of the battery system. The heat generated by the battery system is conducted out of the bottom of the battery system through the cooling system, thereby dissipating heat and cooling the battery system.

[0004] However, as the charging rate of the battery system increases, the heat generated during the charging process also increases. The cooling system in the related art can no longer meet the heat dissipation and cooling requirements.

[0005] Summary of the Invention

[0006] Embodiments of the present application provide a cooling system, a battery system, and an electric vehicle to overcome the problem of poor heat dissipation in related technologies.

[0007] In a first aspect, the present application provides a cooling system that can be applied to a battery pack to achieve cooling and heat dissipation of the battery pack. The cooling system includes a first cooling component and a second cooling component, and the first cooling component and the second cooling component are spaced apart from each other so that the battery pack can be located between the first cooling component and the second cooling component. The first cooling component is located at the tab of the battery pack to dissipate heat and cool the tab of the battery pack. The second cooling component is located at the bottom of the battery pack to dissipate heat and cool the bottom of the battery pack. In this way, the battery pack can be cooled by both the first cooling component and the second cooling component, effectively improving the heat dissipation and cooling effect of the cooling system on the battery pack, so that the battery pack can be charged at a high rate.

[0008] The cooling system provided in the embodiment of the present application has at least the following effects:

[0009] Since the cooling system includes the first cooling component and the second cooling component, the first cooling component can be used to cool the battery pack, and the second cooling component can be used to cool the battery pack, which effectively improves the heat dissipation and cooling effect of the cooling system on the battery pack. In addition, the first cooling component is located at the tab of the battery pack, and the second cooling component is opposite to the first cooling component, that is, the second cooling component is located at the bottom of the battery pack. Since the heat transfer efficiency of the tab and the bottom of the battery pack is much higher than that of other parts, the first cooling component is arranged at the tab of the battery pack and the second cooling component is arranged at the bottom of the battery pack, which can further improve the heat dissipation and cooling effect of the cooling system on the battery pack, so that the battery pack can be charged at a high rate.

[0010] As an exemplary embodiment, the first cooling assembly includes a carrier and a flow channel group. The carrier is used to provide a stable mounting base for the flow channel group, and the flow channel group is used to provide good heat dissipation and cooling for the battery pack. The carrier has a plurality of tab holes arranged at intervals. When one side of the carrier contacts the battery pack, the tabs of the battery pack are inserted into the tab holes, thereby facilitating contact between the flow channel group located on the carrier and the tabs. The flow channel group is located on the side of the carrier facing away from the battery pack. The flow channel group can contact the tabs through the tab holes to provide heat dissipation and cooling for the tabs.

[0011] As an exemplary embodiment, the flow channel group includes a water inlet pipe, a water outlet pipe and a heat exchange pipe. The water inlet pipe is used to introduce the cooling medium into the flow channel group, and the water outlet pipe is used to lead the cooling medium out of the flow channel group, thereby realizing the circulation of the cooling medium in the flow channel group. Since one end of the heat exchange pipe is connected to the water inlet pipe and the other end of the heat exchange pipe is connected to the water outlet pipe, the cooling medium can enter the heat exchange pipe from the water inlet pipe and be led out of the heat exchange pipe by the water outlet pipe. In addition, since the heat exchange pipe extends along the arrangement direction of the multiple tab holes on the carrier and contacts the multiple tabs, the cooling medium can generate sufficient heat exchange with the tabs during the flow in the heat exchange pipe, that is, the heat dissipation cooling of the battery pack is achieved by liquid cooling.

[0012] As an exemplary embodiment, the heat exchange tube is a serpentine tube. Such a design enables the heat exchange tube to contact as many of the tabs as possible within a limited space, thereby facilitating a miniaturized design of the cooling system while ensuring heat exchange efficiency.

[0013] As an exemplary embodiment, the water inlet and outlet pipes are arranged side by side, which not only makes the flow channel assembly structure more compact but also allows for easier connection to the heat exchange pipes. Furthermore, the heat exchange pipes are located on the same side of the inlet and outlet pipes, facilitating their placement and ensuring a more stable installation on the carrier to dissipate heat and cool the battery pack.

[0014] As an exemplary embodiment, the carrier includes a mainboard and a plurality of clips. The mainboard is used to provide a mounting base for the clips, and the clips are used to clip and fix the heat exchange tubes to the mainboard. The plurality of clips are all connected to one side of the mainboard, and the clips and the heat exchange tubes are located on the same side of the mainboard. The heat exchange tubes are clipped into the clips, thereby achieving the clipping and fixing of the heat exchange tubes to the mainboard. Moreover, since the arrangement direction of the plurality of clips is consistent with the arrangement direction of the plurality of tab holes, the plurality of clips can fully clip the heat exchange tubes extending along the arrangement direction of the plurality of tab holes on the carrier, thereby improving the clipping stability of the heat exchange tubes on the mainboard.

[0015] As an exemplary embodiment, the carrier has a plurality of safety holes spaced apart from each other, and the safety holes are opposite the pressure relief vents of the battery pack. The pressure relief vents on the battery pack are capable of bursting open when the internal pressure of the battery pack is excessive, thereby achieving internal pressure relief of the battery pack. Because the safety holes on the carrier are opposite the pressure relief vents, even if the carrier contacts the battery pack, the safety holes can still make room for the pressure relief vents to burst open. This does not affect the pressure relief vents from bursting open when the internal pressure of the battery pack is excessive. In other words, the safety performance of the battery pack will not be affected by adding a cooling system to the battery pack.

[0016] As an exemplary embodiment, there is a heat-conducting medium between the runner group and the tab, and the heat-conducting medium can achieve good heat conduction between the runner group and the tab, so that the heat at the tab can be quickly conducted to the runner group through the heat-conducting medium, thereby achieving heat dissipation and cooling. The heat-conducting medium is any one of a thermal adhesive and a thermal pad, and good heat conduction between the runner group and the tab can be achieved through the thermal adhesive or the thermal pad. In addition, the heat-conducting medium is arranged between the runner group and the tab, and the heat-conducting medium can be used to weaken the assembly tolerance, thereby ensuring the contact area between the runner group and the tab, so that the runner group is in full contact with the tab through the heat-conducting medium.

[0017] In an exemplary embodiment, the outer wall of the flow channel assembly has an insulating layer, which prevents current from the tab from flowing into the flow channel assembly and causing circuit failure. The insulating layer can be either an insulating coating or an insulating film. Spraying the insulating coating on the outer wall of the flow channel assembly or coating the outer wall of the flow channel assembly with an insulating film can both provide insulation for the flow channel assembly.

[0018] As an exemplary embodiment, the cooling system also includes a connected pump and a radiator, and the first cooling component and the second cooling component are connected in series in a loop formed by the pump and the radiator. The pump is used to pump a cooling medium so that the cooling medium can flow between the radiator, the first cooling component and the second cooling component. When the cooling medium flows through the first cooling component and the second cooling component, it can exchange heat with the battery pack to absorb the heat generated by the battery pack, thereby achieving heat dissipation and cooling of the battery pack. When the cooling medium flows through the radiator, it can dissipate the absorbed heat to the outside world, thereby lowering its own temperature, so that when it flows through the first cooling component and the second cooling component again in the future, it can better absorb the heat generated by the battery pack. With this design, the pump, the radiator, the first cooling component and the second cooling component form a circulation loop of the cooling medium, thereby performing cyclic heat dissipation and cooling on the battery pack.

[0019] As an exemplary embodiment, the cooling system further includes a three-way valve, the inlet of which is connected to the radiator, one outlet of which is connected to the first cooling assembly, and the other outlet of which is connected to the second cooling assembly. This design allows the three-way valve to control the flow of the cooling medium through the first cooling assembly, the second cooling assembly, or both. When the battery pack generates less heat, the three-way valve communicates with either the first cooling assembly or the second cooling assembly, allowing the cooling medium output from the radiator to enter either the first cooling assembly or the second cooling assembly to cool the battery pack. This approach satisfies both lower heat dissipation and cooling requirements and conserves energy. When the battery pack generates more heat, the three-way valve communicates with both the first cooling assembly and the second cooling assembly, allowing the cooling medium output from the radiator to enter both the first cooling assembly and the second cooling assembly to cool the battery pack. In this case, since both the first cooling assembly and the second cooling assembly are in operation, increased heat dissipation and cooling requirements can be met. Such a design enables the cooling system to control the working states of the first cooling component and the second cooling component according to the heat generated by the battery pack, thereby meeting the heat dissipation and cooling requirements while saving energy.

[0020] In a second aspect, the present application also provides a battery system, which includes a battery pack and the cooling system described in the first aspect. The battery pack is located between the first cooling component and the second cooling component. The battery pack includes a plurality of battery cells arranged side by side. The battery cell includes a main body and two tabs. The polarities of the two tabs are opposite, and the two tabs are in contact with the first cooling component respectively. With this design, the first cooling component can be used to dissipate heat and cool the tabs of the battery pack, and the second cooling component can be used to dissipate heat and cool the bottom of the battery pack, effectively improving the overall heat dissipation and cooling effect of the battery system, so that the battery system can be charged at a high rate.

[0021] The battery system provided in the embodiment of the present application has at least the following effects:

[0022] Since the battery pack is located between the first cooling assembly and the second cooling assembly, the battery pack can be cooled by both the first cooling assembly and the second cooling assembly, which effectively improves the heat dissipation and cooling effect of the cooling system on the battery pack. Since the battery cells of the battery pack are arranged side by side, and the tabs of the battery cells are in contact with the first cooling assembly, and the bottoms of the battery cells are in contact with the second cooling assembly, the tabs of the battery cells can be effectively cooled by the first cooling assembly, and the bottoms of the battery cells can be effectively cooled by the second cooling assembly. Since the heat transfer efficiency of the tabs and the bottom of the battery pack is much higher than that of other parts, the design of the setting positions of the first cooling assembly and the second cooling assembly can further ensure the overall heat dissipation and cooling effect of the battery system, so that the battery system can be charged at a high rate.

[0023] As an exemplary embodiment, the battery pack further includes multiple tab motherboards, each of which is connected to a tab of two adjacent battery cells, and each of which is in contact with the first cooling assembly. With this design, since the tab motherboard is connected to the two tabs, heat from the two tabs is transferred to the tab motherboard. The first cooling assembly then dissipates heat from the tab motherboard, effectively cooling the two tabs. This effectively simplifies the layout of the first cooling assembly while ensuring the heat dissipation and cooling effect of the first cooling assembly.

[0024] In a third aspect, the present application further provides an electric vehicle, which includes the battery system described in the second aspect and can utilize the battery system to achieve high-rate charging.

[0025] The electric vehicle provided in the embodiment of the present application has at least the following effects:

[0026] Since the battery system configured in the electric vehicle has a good heat dissipation and cooling effect, the electric vehicle can adapt to high-rate charging, such as super charging, etc., which effectively improves the charging speed of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a simplified structural diagram of a cooling system provided in an embodiment of the present application;

[0028] FIG2 is a schematic structural diagram of a cooling system provided in an embodiment of the present application;

[0029] FIG3 is a schematic diagram of the structure of a carrier provided in an embodiment of the present application;

[0030] FIG4 is a cross-sectional view taken along the AA direction of FIG2 provided in an embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of a flow channel assembly provided in an embodiment of the present application;

[0032] FIG6 is a cross-sectional view of a heat exchange tube provided in an embodiment of the present application;

[0033] FIG7 is an exploded view of a battery system provided in an embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of a battery system provided in an embodiment of the present application;

[0036] FIG10 is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application.

[0037] Legend:

[0038] 10. First cooling assembly;

[0039] 110. carrier;

[0040] 111. Ear hole; 112. Main board; 113. Buckle; 114. Safety hole;

[0041] 120, runner group;

[0042] 121, water inlet pipe; 122, water outlet pipe; 123, heat exchange tube; 124, inclined tube;

[0043] 130. Heat transfer medium;

[0044] 20. Second cooling assembly;

[0045] 30. Battery pack;

[0046] 310, tab; 320, battery cell; 330, tab motherboard; 340, pressure relief vent;

[0047] 40. Pump;

[0048] 50. Radiator;

[0049] 60. Three-way valve;

[0050] 100. Battery system. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0052] Electric vehicles are a new energy vehicle, and the battery system is a key system in electric vehicles, largely determining their overall performance. With the rapid development of electric vehicles, battery systems are developing towards high energy density, long driving range, short charging time, high safety, high space utilization, lightweight, and long cycle life.

[0053] Currently, the main challenge facing short charging times is the heat dissipation and cooling of the battery system. During high-rate charging, the battery pack 30 generates significant heat. In related technologies, a cooling system is installed at the bottom of the battery system to dissipate the heat generated by the battery system, thereby providing cooling for the battery system.

[0054] However, for high-rate charging such as super fast charging, the cooling system in related technologies can no longer meet the heat dissipation and cooling requirements.

[0055] In order to solve the above technical problems, an embodiment of the present application provides a cooling system. Figure 1 is a schematic structural diagram of the cooling system. Referring to Figure 1, the cooling system is applied to a battery pack 30. The cooling system includes a first cooling component 10 and a second cooling component 20. The first cooling component 10 and the second cooling component 20 are respectively located on opposite sides of the battery pack 30, and the first cooling component 10 is located at the pole ear 310 of the battery pack 30.

[0056] Because the cooling system includes a first cooling assembly 10 and a second cooling assembly 20, the battery pack 30 can be cooled by both the first cooling assembly 10 and the second cooling assembly 20, effectively improving the cooling system's cooling effect on the battery pack 30. Furthermore, the first cooling assembly 10 is located at the tab 310 of the battery pack 30, while the second cooling assembly 20 is opposite the first cooling assembly 10, i.e., the second cooling assembly 20 is located at the bottom of the battery pack 30. Because the heat transfer efficiency at the tab 310 and the bottom of the battery pack 30 is significantly higher than at other locations, positioning the first cooling assembly 10 at the tab 310 and the second cooling assembly 20 at the bottom of the battery pack 30 further improves the cooling system's cooling effect on the battery pack 30, enabling high-rate charging of the battery pack 30.

[0057] In this embodiment, the first cooling assembly 10 and the second cooling assembly 20 are both liquid-cooled, that is, a cooling medium flows therethrough, and heat exchange is achieved through the cooling medium.

[0058] Exemplarily, the cooling medium is any one of a coolant and a refrigerant. Both the coolant and the refrigerant can achieve good heat exchange with the battery pack 30 , thereby achieving heat dissipation and cooling of the battery pack 30 .

[0059] 1, the circulation mode of the cooling medium will be introduced.

[0060] In this embodiment, the cooling system further includes a connected pump 40 and a radiator 50 , and the first cooling assembly 10 and the second cooling assembly 20 are connected in series in a loop formed by the pump 40 and the radiator 50 .

[0061] In the above implementation, the pump 40 is used to pump the cooling medium so that the cooling medium can flow between the radiator 50, the first cooling assembly 10 and the second cooling assembly 20. When the cooling medium flows through the first cooling assembly 10 and the second cooling assembly 20, it can exchange heat with the battery pack 30 to absorb the heat generated by the battery pack 30, thereby achieving heat dissipation and cooling of the battery pack 30. When the cooling medium flows through the radiator 50, it can dissipate the absorbed heat to the outside, thereby lowering its own temperature, so that when it flows through the first cooling assembly 10 and the second cooling assembly 20 again, it can better absorb the heat generated by the battery pack 30. With this design, the pump 40, the radiator 50, the first cooling assembly 10 and the second cooling assembly 20 form a circulation loop of the cooling medium, thereby circulating heat dissipation and cooling the battery pack 30.

[0062] Exemplarily, the pump 40 is an electric water pump 40, which can be controlled individually to adjust its own working state according to different needs. When the heat dissipation and cooling demand of the cooling system is large, the pump 40 can increase its own speed so that the cooling medium flows at high speed. When the heat dissipation and cooling demand of the cooling system is small, the pump 40 can lower its own speed to achieve energy saving.

[0063] In this embodiment, the cooling system also includes a three-way valve 60, the inlet of the three-way valve 60 is connected to the radiator 50, one outlet of the three-way valve 60 is connected to the first cooling component 10, and the other outlet of the three-way valve 60 is connected to the second cooling component 20.

[0064] In the above implementation, the three-way valve 60 serves as a channel connecting the radiator 50 with the first cooling component 10 and the second cooling component 20. The three-way valve 60 can control the cooling medium output by the radiator 50 to flow through the first cooling component 10, or the second cooling component 20, or the first cooling component 10 and the second cooling component 20, which is determined according to the heat dissipation and cooling requirements of the cooling system.

[0065] For example, when the heat generated by the battery pack 30 is relatively small, the heat dissipation and cooling requirements of the cooling system are correspondingly relatively small. In this case, the three-way valve 60 is connected to one of the first cooling assembly 10 or the second cooling assembly 20, so that the cooling medium output by the radiator 50 can enter one of the first cooling assembly 10 or the second cooling assembly 20 to dissipate heat and cool the battery pack 30. In this case, both the smaller heat dissipation and cooling requirements can be met and energy can be saved. When the heat generated by the battery pack 30 is relatively large, the three-way valve 60 is connected to both the first cooling assembly 10 and the second cooling assembly 20, so that the cooling medium output by the radiator 50 enters the first cooling assembly 10 and the second cooling assembly 20 respectively to dissipate heat and cool the battery pack 30. In this case, since both the first cooling assembly 10 and the second cooling assembly 20 are working, the increased heat dissipation and cooling requirements can be met.

[0066] That is to say, through the control of the three-way valve 60, the cooling system can control the working status of the first cooling component 10 and the second cooling component 20 according to the heat generated by the battery pack 30, thereby meeting the heat dissipation and cooling requirements and saving energy.

[0067] As can be seen from the foregoing, both the first cooling assembly 10 and the second cooling assembly 20 are liquid-cooled. The first cooling assembly 10 and the second cooling assembly 20 are introduced below respectively.

[0068] Figure 2 is a schematic diagram of the cooling system. The pump 40, radiator 50, and three-way valve 60 mentioned above are omitted in Figure 2. Only the first cooling assembly 10, the second cooling assembly 20, and the battery pack 30 are shown. Referring to Figure 2 , in this embodiment, the first cooling assembly 10 includes a carrier 110 and a flow channel assembly 120.

[0069] FIG3 is a schematic structural diagram of the carrier 110. In conjunction with FIG3 , the carrier 110 has a plurality of tab holes 111 spaced apart from each other.

[0070] 4 is a cross-sectional view taken along the AA direction in FIG. 2 . In conjunction with FIG. 4 , one side of the carrier 110 contacts the battery pack 30 so that the tab 310 is located in the tab hole 111 . The flow channel group 120 is located on the other side of the carrier 110 and contacts the tab 310 .

[0071] In the above implementation, the carrier 110 is used to provide a stable mounting base for the flow channel assembly 120, which in turn provides a channel for the cooling medium to flow, thereby providing good heat dissipation and cooling for the battery pack 30. Because the carrier 110 has a plurality of spaced-apart tab holes 111, when one side of the carrier 110 contacts the battery pack 30, the tab 310 of the battery pack 30 is inserted into the tab hole 111. In this way, the flow channel assembly 120 on the other side of the carrier 110 can contact the tab 310, thereby dissipating heat and cooling the tab 310.

[0072] Illustratively, the carrier 110 and the battery pack 30 are connected by bonding, so that the carrier 110 can be firmly connected to the battery pack 30, so that the flow channel group 120 on the carrier 110 can be firmly in contact with the tab 310 of the battery pack 30, thereby ensuring the heat dissipation and cooling effect of the tab 310.

[0073] In order to further improve the sufficient contact between the flow channel group 120 and the tab 310, in this embodiment, a heat conducting medium 130 is provided between the flow channel group 120 and the tab 310. The heat conducting medium 130 can achieve good heat conduction between the flow channel group 120 and the tab 310, so that the heat at the tab 310 can be quickly transferred to the flow channel group 120 through the heat conducting medium 130, thereby achieving heat dissipation and cooling.

[0074] Exemplarily, the thermally conductive medium 130 is any one of thermally conductive adhesive and thermally conductive pads, both of which can achieve good heat conduction between the runner assembly 120 and the tab 310. In addition, by providing the thermally conductive medium 130 between the runner assembly 120 and the tab 310, the thermally conductive medium 130 can be used to weaken the assembly tolerance, thereby ensuring the contact area between the runner assembly 120 and the tab 310, so that the runner assembly 120 is in full contact with the tab 310 through the thermally conductive medium 130.

[0075] Since the tabs 310 are charged when the battery pack 30 is in operation, in order to prevent the current at the tabs 310 from flowing to the flow channel assembly 120 and causing circuit failure, in this embodiment, the outer wall of the flow channel assembly 120 has an insulating layer. For example, the insulating layer is either an insulating coating or an insulating film. By spraying the insulating coating on the outer wall of the flow channel assembly 120 or coating the outer wall of the flow channel assembly 120 with an insulating film, the flow channel assembly 120 can be insulated.

[0076] It should be noted that, in order to ensure the heat dissipation and cooling effect of the flow channel assembly 120 , the insulating layer should have good thermal conductivity so that the heat at the tab 310 can be transferred to the flow channel assembly 120 .

[0077] Figure 5 is a structural schematic diagram of the flow channel group 120. Combined with Figure 5, in this embodiment, the flow channel group 120 includes: a water inlet pipe 121, a water outlet pipe 122 and a heat exchange pipe 123. One end of the heat exchange pipe 123 is connected to the water inlet pipe 121, and the other end of the heat exchange pipe 123 is connected to the water outlet pipe 122. The heat exchange pipe 123 extends along the arrangement direction of the multiple pole ear holes 111 on the carrier 110 to contact the multiple pole ears 310.

[0078] In the above implementation, the water inlet pipe 121 is used to introduce the cooling medium into the flow channel group 120, and the water outlet pipe 122 is used to guide the cooling medium out of the flow channel group 120. For example, the water inlet pipe 121 is connected to one outlet of the three-way valve 60, and the water outlet pipe 122 is connected to the inlet of the pump 40. Since one end of the heat exchange tube 123 is connected to the water inlet pipe 121 and the other end of the heat exchange tube 123 is connected to the water outlet pipe 122, the cooling medium can enter the heat exchange tube 123 through the water inlet pipe 121 and be guided out of the heat exchange tube 123 through the water outlet pipe 122, thereby achieving the circulation of the cooling medium in the flow channel group 120.

[0079] Moreover, since the heat exchange tube 123 extends along the arrangement direction of the multiple tab holes 111 on the carrier 110 and contacts the multiple tabs 310, the cooling medium can generate sufficient heat exchange with the tabs 310 during the flow in the heat exchange tube 123, that is, heat dissipation and cooling of the battery pack 30 are achieved through liquid cooling.

[0080] For example, the heat exchange tube 123 is a serpentine tube. Such a design enables the heat exchange tube 123 to contact as many tabs 310 as possible within a limited space, thereby facilitating a miniaturized design of the cooling system while ensuring heat exchange efficiency.

[0081] Figure 6 is a cross-sectional view of the heat exchange tube 123. In conjunction with Figure 6, the cross-section of the heat exchange tube 123 is an isosceles trapezoid, the upper base of the trapezoid faces away from the carrier 110, and the lower base of the trapezoid faces the carrier 110, that is, the lower base of the trapezoid is in contact with the electrode tab 310, thereby ensuring the contact area between the heat exchange tube 123 and the electrode tab 310, which is beneficial to heat exchange between the heat exchange tube 123 and the electrode tab 310.

[0082] In addition, designing the cross-section of the heat exchange tube 123 as an isosceles trapezoid can also facilitate spraying insulating paint on the heat exchange tube 123.

[0083] Referring to FIG. 5 again, in this embodiment, the water inlet pipe 121 and the water outlet pipe 122 are arranged side by side, and the heat exchange pipe 123 is located on the same side of the water inlet pipe 121 and the water outlet pipe 122 .

[0084] In the above implementation, the water inlet pipe 121 and the water outlet pipe 122 are arranged side by side, which not only makes the structure of the flow channel assembly 120 more compact, but also allows the water inlet pipe 121 and the water outlet pipe 122 to be more conveniently connected to the heat exchange pipe 123. Furthermore, the heat exchange pipe 123 is located on the same side of the water inlet pipe 121 and the water outlet pipe 122, which facilitates the arrangement of the heat exchange pipe 123, thereby better stabilizing the installation on the carrier 110 and achieving heat dissipation and cooling of the battery pack 30.

[0085] Exemplarily, the water inlet pipe 121, the water outlet pipe 122, and the heat exchange pipe 123 are all parallel to the plane of the carrier 110, and the water inlet pipe 121 and the water outlet pipe 122 are stacked in a direction perpendicular to the plane. To ensure that the heat exchange pipe 123 can be connected to both the water inlet pipe 121 and the water outlet pipe 122, the heat exchange pipe 123 is located between the water inlet pipe 121 and the water outlet pipe 122 in the stacking direction of the water inlet pipe 121 and the water outlet pipe 122. Both ends of the heat exchange pipe 123 have an inclined pipe 124. One end of one inclined pipe 124 is connected to the heat exchange pipe 123, and the other end is inclined toward the water inlet pipe 121 and connected to the water inlet pipe 121. The other inclined pipe 124 has one end connected to the heat exchange pipe 123, and the other end is inclined toward the water outlet pipe 122 and connected to the water outlet pipe 122.

[0086] Illustratively, the inclined tube 124 is connected to the heat exchange tube 123 , the water inlet pipe 121 , and the water outlet pipe 122 by means of quick-connect joints, thereby ensuring the structural stability and assembly convenience of the flow channel group 120 .

[0087] Referring to Figure 3 again, in this embodiment, the main board 112 and multiple clips 113, the multiple clips 113 are all connected to one side of the main board 112, and the arrangement direction of the multiple clips 113 is consistent with the arrangement direction of the multiple pole ear holes 111, and the heat exchange tube 123 is clipped into the clip 113 (see Figure 4).

[0088] In the above implementation, the mainboard 112 is used to provide an installation base for the clips 113, and the clips 113 are used to clip and secure the heat exchange tubes 123 to the mainboard 112. Multiple clips 113 are connected to one side of the mainboard 112. The clips 113 and the heat exchange tubes 123 are located on the same side of the mainboard 112. The heat exchange tubes 123 are clipped into the clips 113, thereby clipping and securing the heat exchange tubes 123 to the mainboard 112. Furthermore, because the arrangement direction of the multiple clips 113 is consistent with the arrangement direction of the multiple tab holes 111, the multiple clips 113 can fully clip the heat exchange tubes 123 extending along the arrangement direction of the multiple tab holes 111 on the carrier 110, thereby improving the secure attachment of the heat exchange tubes 123 to the mainboard 112.

[0089] Exemplarily, the bayonet includes a pair of hooks that are arranged opposite to each other, so that the heat exchange tube 123 can be clamped into the pair of hooks.

[0090] In this embodiment, the carrier 110 has a plurality of safety holes 114 spaced apart from each other. The safety holes 114 are opposite to the pressure relief holes 340 of the battery pack 30 .

[0091] In the above implementation, the pressure relief vent 340 on the battery pack 30 is capable of bursting open when the internal pressure of the battery pack 30 is excessive, thereby relieving the internal pressure of the battery pack 30. Because the safety hole 114 on the carrier 110 is opposite the pressure relief vent 340, even if the carrier 110 contacts the battery pack 30, the bursting of the pressure relief vent 340 when the internal pressure of the battery pack 30 is excessive will not be affected. In other words, the safety performance of the battery pack 30 will not be affected by adding a cooling system to the battery pack 30.

[0092] In this embodiment, the second cooling assembly 20 is a liquid cooling plate. The inlet of the liquid cooling plate is connected to one outlet of the three-way valve 60, and the outlet of the liquid cooling plate is connected to the inlet of the pump 40. The liquid cooling plate is bonded to the bottom of the battery pack 30 with thermally conductive adhesive, thereby dissipating heat from the bottom of the battery pack 30.

[0093] FIG7 is an exploded view of a battery system provided in an embodiment of the present disclosure. The pump 40, the radiator 50 and the three-way valve 60 are omitted in FIG7. In conjunction with FIG7, in this embodiment, the battery system includes a battery pack 30 and the cooling system shown in FIG1-6.

[0094] 8 is a schematic structural diagram of a battery pack 30 . The battery pack 30 includes a plurality of battery cells 320 arranged side by side. The battery cell 320 includes a main body and two tabs 310 with opposite polarities. The two tabs 310 are in contact with the first cooling assembly 10 , respectively.

[0095] Because the battery pack 30 is located between the first cooling assembly 10 and the second cooling assembly 20, the battery pack 30 can be cooled by both the first cooling assembly 10 and the second cooling assembly 20, effectively improving the cooling system's heat dissipation for the battery pack 30. Since the battery cells 320 of the battery pack 30 are arranged side by side, with the tabs 310 of the battery cells 320 in contact with the first cooling assembly 10 and the bottoms of the battery cells 320 in contact with the second cooling assembly 20, the tabs 310 of the battery cells 320 can be effectively cooled by the first cooling assembly 10, while the bottoms of the battery cells 320 can be effectively cooled by the second cooling assembly 20. Because the heat transfer efficiency at the tabs 310 and the bottom of the battery pack 30 is significantly higher than that at other locations, this design of the placement of the first cooling assembly 10 and the second cooling assembly 20 further ensures the overall heat dissipation and cooling of the battery system, enabling the battery system to be charged at a high rate.

[0096] In this embodiment, the battery pack 30 is composed of multiple battery cells 320 arranged side by side. For example, as shown in Figures 7 and 8, 12 battery cells 320 are arranged side by side to form a battery pack 30. Two battery packs 30 are arranged in parallel and share the first cooling assembly 10 and the second cooling assembly 20. In another example, referring to Figure 9, Figure 9 is a schematic structural diagram of another battery system. The difference between Figure 9 and Figure 7 is that Figure 9 has two rows of battery packs 30, and the two rows of battery packs 30 share a second cooling assembly 20. A row of battery packs 30 has multiple battery packs 30 arranged in parallel. Each battery pack 30 in a row of battery packs 30 shares a water inlet pipe 121 and a water outlet pipe 122. Two adjacent parallel battery packs 30 share a carrier 110 and a heat exchange pipe 123. Such a design is conducive to the integration of the battery system, thereby reducing the installation space required for the battery system and improving space utilization.

[0097] Of course, the number of battery packs 30 in the battery system and the number of battery cells 320 in each battery pack 30 can be adjusted according to actual needs. Accordingly, the layout of the cooling system should also be adjusted accordingly, such as setting a corresponding number of carriers 110, heat exchange tubes 123, etc. This application does not impose any restrictions on this.

[0098] Referring again to FIG. 8 , in this embodiment, the battery pack 30 further includes a plurality of tab motherboards 330 . The tab motherboards 330 are respectively connected to one tab 310 of two adjacent battery cells 320 , and the tab motherboards 330 are in contact with the first cooling assembly 10 .

[0099] In the above implementation, two adjacent battery cells 320 are connected together via the tab motherboard 330. Since the tab motherboard 330 is connected to the two tabs 310, the heat of the two tabs 310 is transferred to the tab motherboard 330. The first cooling assembly 10 then dissipates heat from the tab motherboard 330, thereby achieving heat dissipation and cooling of the two tabs 310. In this way, while ensuring the heat dissipation and cooling effect of the first cooling assembly 10, the layout of the first cooling assembly 10 is effectively simplified.

[0100] Regarding the connection method of the tab motherboard 330, for example, one method is to connect one end of the tab motherboard 330 to the positive tab of one battery cell 320, and the other end of the tab motherboard 330 to the negative tab of another battery cell 320, so that the two battery cells 320 are connected in series. Another method is to connect one end of the tab motherboard 330 to the positive tab of one battery cell 320, and the other end of the tab motherboard 330 to the positive tab of another battery cell 320, so that the two battery cells 320 are connected in parallel. The above two methods can be selected according to actual needs and are not limited in this disclosure.

[0101] In this embodiment, the tab motherboard 330 has two positioning points for achieving laser welding between the tab motherboard 330 and the tab 310. In addition, the positioning points can also play a positioning role during laser welding, ensuring the accuracy of laser welding.

[0102] FIG10 is a schematic structural diagram of an electric vehicle provided by an embodiment of the present disclosure. In conjunction with FIG10 , the electric vehicle includes the battery system 100 shown in FIG7-9 .

[0103] Since the battery system 100 configured for the electric vehicle has good heat dissipation and cooling effects, the electric vehicle can adapt to high-rate charging, such as super charging, and effectively improves the charging speed of the electric vehicle.

[0104] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words “first”, “second”, “third” and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “a” or “an” do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as “include” or “comprise” mean that the elements or objects appearing before “include” or “comprises” include the elements or objects listed after “include” or “comprises” and their equivalents, and do not exclude other elements or objects. Words such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0105] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A cooling system for a battery pack (30), characterized in that: include: A first cooling assembly (10) and a second cooling assembly (20); The first cooling assembly (10) and the second cooling assembly (20) are respectively located on opposite sides of the battery pack (30), and the first cooling assembly (10) is located at the tab (310) of the battery pack (30).

2. The cooling system according to claim 1, characterized in that The first cooling component (10) comprises: a carrier (110) and a flow channel group (120); The carrier (110) has a plurality of tab holes (111) spaced apart from each other, and one side of the carrier (110) contacts the battery pack (30) so that the tabs (310) are located in the tab holes (111); The flow channel group (120) is located on the other side of the carrier (110), and the flow channel group (120) is in contact with the tab (310).

3. The cooling system according to claim 2, characterized in that The flow channel group (120) includes: a water inlet pipe (121), a water outlet pipe (122) and a heat exchange pipe (123); One end of the heat exchange tube (123) is connected to the water inlet pipe (121), and the other end of the heat exchange tube (123) is connected to the water outlet pipe (122). The heat exchange tube (123) extends along the arrangement direction of the plurality of electrode tab holes (111) on the carrier (110) to contact the plurality of electrode tabs (310).

4. The cooling system according to claim 3, characterized in that The heat exchange tube (123) is a tortuous serpentine tube.

5. The cooling system according to claim 3 or 4, characterized in that: The water inlet pipe (121) and the water outlet pipe (122) are arranged side by side, and the heat exchange pipe (123) is located on the same side of the water inlet pipe (121) and the water outlet pipe (122).

6. The cooling system according to any one of claims 3 to 5, characterized in that: The carrier (110) comprises: a main board (112) and a plurality of buckles (113); The plurality of buckles (113) are all connected to one side of the main board (112), and the arrangement direction of the plurality of buckles (113) is consistent with the arrangement direction of the plurality of tab holes (111); The heat exchange tube (123) is clamped in the buckle (113).

7. The cooling system according to any one of claims 2 to 6, characterized in that: The carrier (110) has a plurality of safety holes (114) spaced apart from each other, and the safety holes (114) are opposite to the pressure relief ports of the battery pack (30).

8. The cooling system according to any one of claims 2 to 7, characterized in that: A heat-conducting medium (130) is provided between the flow channel group (120) and the tab (310), and the heat-conducting medium (130) is any one of a heat-conducting glue and a heat-conducting pad.

9. The cooling system according to any one of claims 2 to 8, characterized in that: The outer wall of the flow channel group (120) has an insulating layer, and the insulating layer is any one of an insulating paint and an insulating film.

10. The cooling system according to any one of claims 1 to 9, characterized in that: The cooling system further comprises: a pump (40) and a radiator (50) connected to each other; The first cooling assembly (10) and the second cooling assembly (20) are connected in series in a loop formed by the pump (40) and the radiator (50).

11. The cooling system according to claim 10, characterized in that The cooling system further includes a three-way valve (60); The inlet of the three-way valve (60) is connected to the radiator (50), one outlet of the three-way valve (60) is connected to the first cooling component (10), and the other outlet of the three-way valve (60) is connected to the second cooling component (20).

12. A battery system, characterized in that: comprising a battery pack (30) and a cooling system according to any one of claims 1 to 11; The battery pack (30) includes a plurality of battery cells (320) arranged side by side, wherein the battery cell (320) includes a main body and two tabs (310) with opposite polarities, and the two tabs (310) are in contact with the first cooling assembly (10) respectively.

13. The battery system according to claim 12, wherein: The battery pack (30) further includes a plurality of tab motherboards (330); The tab motherboard (330) is respectively connected to one tab (310) of two adjacent battery cells (320), and the tab motherboard (330) is in contact with the first cooling assembly (10).

14. An electric vehicle, characterized in that: A battery system comprising the battery system according to claim 12 or 13.

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