Cooling system, battery pack and vehicle

Abstract

The invention relates to a cooling system, a battery pack and a vehicle, the cooling system comprises a liquid cooling plate and a refrigerant release assembly, the interior of the liquid cooling plate is provided with a flow channel for allowing a refrigerant to flow, the liquid cooling plate is used for cooling a battery cell, the refrigerant release assembly is arranged between the liquid cooling plate and the battery cell, and the refrigerant release assembly is at least partially made of a thermal actuating material; and the refrigerant release assembly can release the refrigerant in the runner when the temperature of the battery cell reaches a preset temperature threshold value. When the battery pack works normally, the refrigerant in the flow channel can exchange heat with the battery cells and take away heat generated by the battery cell group, so that the effective cooling of the battery is realized; when the temperature of the battery pack rises or thermal runaway occurs, the refrigerant release assembly made of the thermal actuating material deforms or changes the state under the influence of the temperature, so that the refrigerant in the flow channel of the liquid cooling plate is released, and the refrigerant in the flow channel can be directly released to directly flow to the battery cell and is in direct contact with the battery cell; and efficient heat dissipation of the battery pack is realized.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular, to a cooling system, a battery pack, and a vehicle. Background Art

[0002] With the rapid development of electric vehicles, the safety, reliability, and energy density of battery packs, as core components, are becoming increasingly important. Battery packs are typically composed of multiple cells, which generate heat during charging, discharging, and driving. In related technologies, a cooling system is typically installed on the vehicle to cool the battery. This liquid cooling system typically includes components such as a liquid cooling plate, refrigerant, a water pump, and a radiator. The refrigerant circulates through the flow channel within the liquid cooling plate to remove the heat generated by the battery cells.

[0003] However, when a battery cell experiences thermal runaway, it may not be possible to quickly and effectively reduce the cell temperature, leading to the spread of thermal runaway. Therefore, a device is needed that can quickly respond and release refrigerant when the cell temperature rises abnormally, achieving rapid cooling of the battery pack. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a cooling system, a battery pack, and a vehicle to at least partially solve the technical problems existing in the related art.

[0005] To achieve the above objectives, the first aspect of the present disclosure provides a cooling system for a battery pack, comprising: A liquid cooling plate having a flow channel for a refrigerant therein, and configured to cool the battery cells; A refrigerant release component is at least partially made of a thermoactive material and is capable of releasing the refrigerant in the flow channel when the temperature of the battery core reaches a predetermined temperature threshold.

[0006] Optionally, the predetermined temperature threshold is 85°C~95°C.

[0007] Optionally, the thermoactive material is a memory alloy.

[0008] Optionally, the refrigerant release assembly includes at least one puncture assembly, each of the puncture assembly includes a support seat and at least one puncture member arranged on the support seat, the support seat is made of thermal braking material, the side of the support seat facing away from the puncture member is used to abut against the battery cell, and the end of the puncture member facing away from the battery cell abuts against the liquid cooling plate.

[0009] Optionally, the end of the piercing member facing away from the battery core is configured as a tapered tip.

[0010] Optionally, the refrigerant release assembly also includes a support plate, which includes a first large surface, a second large surface, and a side surface formed between the first large surface and the second large surface, the side surface of the support plate is connected to the battery shell, at least one puncture assembly is provided on the first large surface of the support plate, and the second large surface of the support plate is provided in contact with the battery cell.

[0011] Optionally, at least one drain port communicating with the flow channel is provided on a side wall of the liquid cooling plate on a side close to the battery cell, and the refrigerant release assembly includes at least one blocking member and at least one thermally actuated member made of a thermally actuated material, the blocking member being used to block the drain port corresponding thereto, and the thermally actuated member blocking the drain port corresponding thereto; The thermally activated member is connected to the blocking member and can be deformed when the temperature of the battery core reaches a predetermined temperature threshold, so as to drive the blocking member to escape from the drain port.

[0012] Optionally, the refrigerant release assembly also includes a connecting seat, the thermally activated part and the sealing part are both arranged on the same side of the connecting seat, the connecting seat is arranged in the flow channel, and the ends of the thermally activated part and the sealing part facing away from the connecting seat are passed through the drain port corresponding thereto.

[0013] Optionally, one end of the thermally actuated member facing away from the connecting seat is flush with the outer wall of the liquid cooling plate on which the drain port is formed, so that the one end of the thermally actuated member facing away from the connecting seat abuts against the battery cell; One end of the blocking member facing away from the connecting seat is flush with the outer wall of the liquid cooling plate where the drain port is formed, so that the one end of the blocking member facing away from the connecting seat abuts against the battery cell.

[0014] A second aspect of the present disclosure provides a battery pack including the cooling system described above.

[0015] Optionally, the battery pack includes a battery housing and a battery cell disposed in the battery housing, and the refrigerant release assembly is disposed between the battery cell and the liquid cooling plate.

[0016] A third aspect of the present disclosure provides a vehicle comprising the cooling system as described above or the battery pack as described above.

[0017] Optionally, the vehicle includes an air-conditioning refrigerant supply system, which is connected to the flow channel of the liquid cooling plate to provide refrigerant to the flow channel.

[0018] Optionally, the vehicle further includes a connecting pipe and a solenoid valve, the air-conditioning refrigerant supply system is connected to the flow channel through the connecting pipe, and the solenoid valve is arranged on the connecting pipe and is used to control the flow rate of the refrigerant flowing through the connecting pipe.

[0019] Optionally, the vehicle further comprises a controller, a temperature sensor and / or a pressure sensor, wherein the temperature sensor and / or the pressure sensor are disposed in the battery pack and are used to measure the temperature value and / or the pressure value in the battery pack, and the controller is respectively connected to the solenoid valve, the temperature sensor and / or the pressure sensor for signals; The controller is used to adjust the opening of the solenoid valve according to the parameters measured by the temperature sensor and / or the pressure sensor.

[0020] Through the above technical solution, when the battery pack is operating normally, through the design of the liquid cooling plate, the refrigerant circulating in the flow channel can exchange heat with the battery cells and take away the heat generated by the battery cell group, thereby achieving effective cooling of the battery; when the battery pack temperature rises or thermal runaway occurs (such as when the battery cell temperature reaches a predetermined temperature threshold), the refrigerant release component made of thermoactive material deforms or changes state under the influence of temperature, thereby releasing the refrigerant in the flow channel of the liquid cooling plate. By directly releasing the refrigerant in the flow channel, the heat around the battery cells can be quickly taken away, achieving efficient heat dissipation.

[0021] Compared with traditional liquid cooling systems, this method of actively releasing refrigerant can reduce the temperature of the battery cells more quickly and inhibit the spread of thermal runaway, effectively preventing dangerous accidents such as overheating and fire in extreme situations, and greatly improving the safety of the battery pack.

[0022] In addition, the refrigerant in the liquid cooling plate is directly used to cool the battery cells. Compared with traditional systems that require complex control systems to adjust the refrigerant, there is no need for additional cooling medium and its circulation system, which is more conducive to the lightweighting of the battery pack and the vehicle.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a cross-sectional view of a battery pack provided by an exemplary embodiment of the present disclosure; Figure 2 yes Figure 1 A magnified view of part A; Figure 3 is a cross-sectional view of a battery pack provided by another exemplary embodiment of the present disclosure; Figure 4 yes Figure 3 An enlarged view of part B, where the refrigerant release component is in a blocked state; Figure 5 yes Figure 3 An enlarged view of part C of FIG, wherein the refrigerant release assembly is in a released state; Figure 6 FIG. 1 is a top view of a battery pack provided in accordance with an exemplary embodiment of the present disclosure.

[0025] Description of Reference Numerals 1-battery pack; 2-temperature sensor; 3-pressure sensor; 10-battery cell; 20-liquid cooling plate; 21-flow channel; 22-drain port; 30-refrigerant release assembly; 31-piercing member; 32-support seat; 33-support plate; 34-sealing member; 35-thermal actuator; 36-connecting seat; 40-battery housing; 60-connecting pipe; 70-solenoid valve; 80-thermal insulation cotton. DETAILED DESCRIPTION

[0026] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0027] In the present disclosure, unless otherwise specified, the directional words such as "up", "down", "left", "right", etc. used to indicate the direction or position relationship are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific directional structure and operation. Therefore, it cannot be understood as a limitation of the present disclosure. The terms "inside" and "outside" refer to the inside and outside of the corresponding structural contour.

[0028] In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another and do not have order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings represent the same elements.

[0029] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0030] refer to Figures 1 to 6As shown, the first aspect of the present disclosure provides a cooling system battery pack 1, including a liquid cooling plate 20 and a refrigerant release assembly 30. The liquid cooling plate 20 has a flow channel 21 for the flow of refrigerant inside. The liquid cooling plate 20 is used to cool the battery cell 10. The refrigerant release assembly 30 is arranged between the liquid cooling plate 20 and the battery cell 10. The refrigerant release assembly 30 is at least partially made of a thermoactive material. The refrigerant release assembly 30 can release the refrigerant in the flow channel 21 when the temperature of the battery cell 10 reaches a predetermined temperature threshold.

[0031] Through the above technical solution, when the battery pack 1 is operating normally, through the design of the liquid cooling plate 20, the refrigerant circulating in the flow channel 21 can exchange heat with the battery cell 10 and take away the heat generated by the battery cell 10, thereby achieving effective cooling of the battery; when the temperature of the battery pack 1 rises or thermal runaway occurs (such as when the temperature of the battery cell 10 reaches a predetermined temperature threshold), the refrigerant release component 30 made of thermoactive material deforms or changes state under the influence of temperature, thereby releasing the refrigerant located in the flow channel 21 of the liquid cooling plate 20. The refrigerant in the flow channel 21 can flow directly to the battery cell 10 and directly contact the battery cell 10, thereby quickly taking away the heat of the battery cell 10, thereby achieving efficient heat dissipation of the battery pack 1.

[0032] Compared with traditional liquid cooling systems, this method of actively releasing refrigerant can reduce the temperature of the battery cell 10 more quickly and suppress the spread of thermal runaway, effectively preventing the battery from overheating, fire and other dangerous accidents in extreme situations, and greatly improving the safety of the battery pack 1.

[0033] Furthermore, the refrigerant in the liquid cooling plate 20 is directly used to cool the battery cell 10. Compared with the traditional system that requires a complex control system to adjust the refrigerant, no additional cooling medium and its circulation system are required, which is more conducive to the lightweighting of the battery pack 1 and the vehicle.

[0034] In an exemplary embodiment provided herein, the predetermined temperature threshold may optionally be 85° C. to 95° C. That is, when the temperature of the battery cell 10 is higher than 85° C., the refrigerant release assembly 30 may deform under the action of the temperature to release the refrigerant in the liquid cooling plate 20 .

[0035] The above-mentioned predetermined temperature threshold can be 85℃~95℃, which can also be understood as, when the temperature of the battery cell 10 is lower than 85℃ (the battery cell 10 is in normal operating state, and the temperature of the battery cell 10 is at a lower temperature), the refrigerant release component 30 made of thermoactive material has not reached the deformation temperature, and the shape of the refrigerant release component 30 does not change, that is, in the above process, the refrigerant release component 30 will not release the refrigerant in the flow channel 21; when the temperature of the battery cell 10 gradually rises and reaches 85℃, the refrigerant release component 30 reaches the deformation temperature range and begins to deform. During the deformation process, the refrigerant release component 30 touches the liquid cooling plate 20, thereby achieving the purpose of releasing the refrigerant in the flow channel 21, and realizing intelligent regulation of the temperature of the battery cell 10.

[0036] In one embodiment of the present disclosure, the thermoactive material may be a memory alloy. Alternatively, in other embodiments of the present disclosure, the thermoactive material may be a thermoactive polymer such as thermoplastic polyurethane. In short, any material that enables the refrigerant release assembly 30 to release the refrigerant within the flow channel 21 when the temperature reaches a preset temperature threshold will suffice.

[0037] In an exemplary embodiment provided by the present disclosure, the above-mentioned memory alloy can be a shape memory alloy, such as nickel-titanium alloy, which has the ability to recover to a predetermined original shape by heating after deformation, thereby achieving the release of the refrigerant in the liquid cooling plate 20.

[0038] The present disclosure does not limit how the refrigerant release component 30 made of the thermally actuated material releases the refrigerant in the flow channel 21. For example, the refrigerant release component 30 can be deformed when the temperature rises, thereby puncturing the liquid cooling plate 20 to achieve the release of the refrigerant in the liquid cooling plate 20. Specifically, in an exemplary embodiment provided by the present disclosure, the refrigerant release component 30 may optionally include at least one puncture component, each of which may include a support seat 32 and at least one puncture member 31 disposed on the support seat 32. The support seat 32 is made of a thermal braking material, and the side of the support seat 32 facing away from the puncture member 31 is used to abut against the battery cell 10, and the end of the puncture member 31 facing away from the battery cell 10 abuts against the liquid cooling plate 20. In this way, Figure 5 As shown, when the temperature of the battery cell 10 is at the above-mentioned preset temperature threshold, the support seat 32 made of thermoactive material that abuts the battery cell 10 will deform (elongate toward the liquid cooling plate 20), thereby driving the piercing member 31 connected to the support seat 32 to move toward the liquid cooling plate 20, and then pierce the side wall of the liquid cooling plate 20. At this time, the refrigerant can flow to the battery cell 10 through the damaged area, thereby achieving efficient and rapid cooling of the battery cell 10 that is in thermal runaway.

[0039] In order to facilitate the piercing member 31 to easily and efficiently pierce the liquid cooling plate 20 when the support base 32 is deformed, in an exemplary embodiment provided in the present disclosure, the end of the piercing member 31 facing away from the battery cell 10 is set to a conical tip.

[0040] In addition, in order to further improve the puncture success rate of the puncture member 31 and avoid the puncture member 31 from bending or being damaged due to insufficient strength during the process of the support seat 32 driving the puncture member 31 to pierce the liquid cooling plate 20, in the embodiment provided in the present disclosure, the puncture member 31 can be made of a metal with greater rigidity such as steel, copper, aluminum alloy, etc.

[0041] Here, it should be noted that in order to facilitate the refrigerant in the liquid cooling plate 20 to quickly flow out from the damaged area after the puncture component punctures the liquid cooling plate 20 (reducing the interference of the puncture component inserted in the damaged area on the refrigerant outflow process), a guide hole can be formed inside the above-mentioned puncture component to facilitate the refrigerant to flow out from the guide hole.

[0042] For the embodiment in which the end of the puncture member 31 away from the battery cell 10 is configured as a conical tip, the interior of the conical tip can be configured to be hollow to form the above-mentioned guide hole.

[0043] In order to facilitate the installation and arrangement of the above-mentioned puncture assembly, as shown in FIG. Figure 1 、 Figure 2 As shown, in one embodiment provided in the present disclosure, the refrigerant release assembly 30 also includes a support plate 33, the support plate 33 includes a first large surface, a second large surface and a side surface formed between the first large surface and the second large surface, the side surface of the support plate 33 is connected to the battery housing 40, at least one puncture assembly is provided on the first large surface of the support plate 33, and the second large surface of the support plate 33 is provided in contact with the battery cell 10.

[0044] On the one hand, the puncture component is arranged on the second largest surface of the support plate 33, which provides an installation position for the puncture component. The puncture component does not need to be connected to other structures of the battery pack 1, thereby avoiding damage to the strength and overall structure of the battery pack 1 when assembling the puncture component. In addition, the structure of the support plate 33 can also effectively isolate the contact between the puncture component and the battery cell 10, thereby avoiding the puncture component from accidentally touching the battery cell 10 or causing damage to the battery cell 10; on the other hand, the second largest surface of the support plate 33 is arranged in close contact with the battery cell 10, and in the process of dissipating heat from the battery cell 10, it can conduct heat more efficiently and quickly, further improving the heat dissipation efficiency and effect of the battery cell 10; at the same time, the contact between the first large surface of the support plate 33 and multiple battery cells 10 can help evenly distribute the temperature on the surface of the battery cell 10, reduce the risk of local overheating, and thus improve the safety and service life of the battery cell 10.

[0045] In addition, the side battery housing 40 connection of the support plate 33 is equivalent to adding a transverse support structure inside the battery housing 40, which can enhance the overall strength and rigidity of the battery housing 40, and improve the ability of the battery pack 1 to resist external impact and vibration, thereby protecting the battery cell 10 group, liquid cooling plate 20 and other components inside the battery housing 40.

[0046] For the embodiment in which a plurality of puncture components are provided on the first large surface of the support plate 33, as shown in FIG. Figure 1 、 Figure 3 As shown, adjacent puncture components can be arranged at intervals, so that multiple puncture members 31 can puncture the liquid cooling plate 20 at different positions, reducing or avoiding dead corners. Once signs of thermal runaway are detected in any battery cell 10, the puncture member 31 arranged opposite to the battery cell 10 can immediately puncture the liquid cooling plate 20, and release the refrigerant in time to cool down the battery cell 10 in this part, thereby minimizing the harm of thermal runaway.

[0047] In another exemplary embodiment provided by the present disclosure, Figures 3 to 5 As shown, at least one drain port 22 connected to the flow channel 21 is provided on the side wall of the liquid cooling plate 20 close to the battery cell 10, and the refrigerant release assembly 30 includes at least one sealing member 34 and at least one thermally actuated member 35 made of a thermally actuated material. The sealing member 34 is used to seal the drain port 22 corresponding thereto, and the thermally actuated member 35 seals the drain port 22 corresponding thereto; the thermally actuated member 35 is connected to the sealing member 34, and can be deformed when the temperature of the battery cell 10 reaches a predetermined temperature threshold, so as to drive the sealing member 34 to disengage from the drain port 22.

[0048] Under normal circumstances (i.e. the thermal actuator 35 has not reached the deformation temperature), the blocking member 34 blocks the drain port 22, and the liquid cooling plate 20 dissipates heat from the battery cell 10 through the circulation of the refrigerant in the internal flow channel 21. However, when the battery cell 10 is overheated, Figure 5 As shown, the thermally actuated member 35 made of a thermally actuated material undergoes deformation or a change in state. The thermally actuated member 35 deforms and drives the blocking member 34 originally blocked at the drain port 22 to move relative to the liquid cooling plate 20, so that the blocking member 34 originally blocked at the drain port 22 is released from the drain port 22. At this time, the refrigerant in the liquid cooling plate 20 can be released through the drain port 22 to directly spray and cool the overheated area, thereby increasing the contact area and cooling intensity between the refrigerant and the battery cell 10, significantly improving the heat dissipation efficiency, and allowing the temperature of the battery cell 10 to return to the normal working range as soon as possible, effectively avoiding thermal runaway of the battery cell 10.

[0049] Moreover, after cooling down the battery that has experienced thermal runaway, the above-mentioned technical solution can also seal the thermally-actuated member 35 and the sealing member 34 that have recovered their deformation after cooling again at the drain port 22 of the liquid cooling plate 20. That is to say, the process of releasing the refrigerant in the liquid cooling plate 20 through the above-mentioned braking member will not cause damage or destruction to the overall structure of the liquid cooling plate 20. The battery cell 10 enables the above-mentioned cooling system to be recycled multiple times, further reducing the cost of use.

[0050] The present disclosure does not impose any restrictions on the specific setting positions of the above-mentioned thermal actuator 35 and the sealing member 34, which can be selected according to actual assembly requirements. For example, the thermal actuator 35 and the sealing member 34 can be set on the outside of the liquid cooling plate 20. In this way, when the sealing member 34 blocks the drain port 22 on the liquid cooling plate 20 and the thermal actuator 35 presses against the liquid cooling plate 20, the heat generated by the battery cell 10 can be quickly transferred to the refrigerant through the sealing member 34 and the thermal actuator 35, thereby achieving rapid and efficient cooling and heat dissipation of the battery cell 10.

[0051] In addition, the present disclosure does not limit the connection relationship between the above-mentioned blocking member 34 and the thermal actuator 35. For example, the blocking member 34 and the thermal actuator 35 can be connected by a direct connection, or the blocking member 34 and the thermal actuator 35 can also be connected by an indirect connection. For example, in terms of the indirect connection between the blocking member 34 and the thermal actuator 35, in an exemplary embodiment provided by the present disclosure, optionally, as Figures 3 to 5 As shown, the refrigerant release assembly 30 may further include a connection seat 36. The thermally actuated member 35 and the blocking member 34 are both disposed on the same side of the connection seat 36. The connection seat 36 is disposed within the flow channel 21. The ends of the thermally actuated member 35 and the blocking member 34 facing away from the connection seat 36 are inserted into the corresponding drain ports 22. The connection seat 36 is disposed within the flow channel 21. Thus, after the blocking member 34 and the thermally actuated member 35 are inserted into the drain ports 22, the ends of the blocking member 34 and the thermally actuated member 35 facing away from the connection seat 36 can maintain abutment against the battery cell 10. This facilitates the movement of the blocking member 34 away from the battery cell 10 when the thermally actuated member 35 deforms.

[0052] like Figures 3 to 5As shown, the end of the thermal actuator 35 facing away from the connecting seat 36 is flush with the outer wall of the liquid cooling plate 20 formed with the drain port 22, so that the end of the thermal actuator 35 facing away from the connecting seat 36 abuts against the battery cell 10; the end of the sealing member 34 facing away from the connecting seat 36 is flush with the outer wall of the liquid cooling plate 20 formed with the drain port 22, so that the end of the sealing member 34 facing away from the connecting seat 36 abuts against the battery cell 10. Since one end of the sealing member 34 close to the battery cell 10 and the other end of the thermally-actuated member 35 close to the battery cell 10 are flush with the outer surface of the liquid-cooling plate 20, on the one hand, when the thermally-actuated member 35 and the sealing member 34 are respectively inserted into the corresponding drain ports 22, they can ensure that the thermally-actuated member 35, the sealing member 34 and the battery cell 10 are tightly fitted together without interfering with the fitting between the liquid-cooling plate 20 and the battery cell 10 or interfering with the battery cell 10; on the other hand, the thermally-actuated member 35 and the sealing member 34, which are respectively flush with the outer wall of the liquid-cooling plate 20, can also abut against the battery cell 10, so that the heat of the battery cell 10 can be directly transferred to the refrigerant in the flow channel 21 through the thermally-actuated member 35 and the sealing member 34, further improving the heat exchange efficiency of the battery.

[0053] In another embodiment of the present disclosure in which the blocking member 34 and the thermally activated member 35 are indirectly connected, the blocking member 34 and the thermally activated member 35 may also be connected via a transmission member, which may be a transmission connecting rod, a hinge, or other structure. In short, any connection is sufficient as long as the thermally activated member 35 is able to drive the blocking member 34 away from the drain port 22 when deformed by heat.

[0054] The second aspect of the present disclosure provides a battery pack 1 including the above-mentioned cooling system. The battery pack 1 has all the beneficial effects of the above-mentioned cooling system, which are not described in detail in the present disclosure.

[0055] The battery pack 1 mentioned above may include a battery housing 40 and a battery cell 10 disposed in the battery housing 40. Figure 1 、 Figure 3 As shown, the refrigerant release assembly 30 is disposed between the battery cell 10 and the liquid cooling plate 20. On the one hand, disposing the refrigerant release assembly 30 between the battery cell 10 and the liquid cooling plate 20 allows the refrigerant in the liquid cooling plate 20 to flow directly and quickly to the battery cell 10 when the refrigerant release assembly 30 releases the refrigerant. On the other hand, when the battery cell 10 is operating normally, the refrigerant release assembly 30 between the battery cell 10 and the liquid cooling plate 20 can also conduct heat from the battery cell 10.

[0056] The third aspect of the present disclosure provides a vehicle, comprising the above cooling system or the above battery pack 1. The vehicle has all the beneficial effects of the above cooling system and battery pack 1, which are not described in detail in the present disclosure.

[0057] Furthermore, the present disclosure does not limit the type of vehicle; it can be any vehicle suitable for use with the vehicle thermal management system. For example, the vehicle can be a sedan, truck, van, or other vehicle, and can be a pure electric vehicle, a hybrid electric vehicle (extended-range vehicle), or the like, without limitation in the present disclosure.

[0058] Optionally, the vehicle may include an air conditioning refrigerant supply system that communicates with the flow channel 21 of the liquid cooling plate 20 to provide refrigerant to the flow channel 21. This allows the refrigerant in the vehicle's air conditioning refrigerant supply system to be utilized during cooling of the battery cells 10, eliminating the need for a separate storage device and refrigerant circulation system. This streamlines the vehicle's overall structure, reduces production and manufacturing costs, and facilitates vehicle inspection and maintenance.

[0059] Alternatively, as Figure 3 、 Figure 6 As shown, the vehicle also includes a connecting pipe 60 and a solenoid valve 70. The air conditioning refrigerant supply system is connected to the flow channel 21 via the connecting pipe 60. The solenoid valve 70 is installed on the connecting pipe 60 and is used to control the flow rate of the refrigerant flowing through the connecting pipe 60. By installing the solenoid valve 70, the connecting pipe 60 can control the flow rate of the refrigerant flowing through the connecting pipe 60, thereby adapting the flow channel 21 to the heat dissipation state of the battery cell 10. For example, when the ambient temperature is low or the battery pack 1 is operating at low power, the solenoid valve 70 can adjust the connecting pipe 60 to a closed state or a low flow state. In this state, the cooling and heat dissipation of the battery cell 10 will not excessively occupy the refrigerant flow channel 21 of the air conditioning system. If the battery pack 1 temperature rises or thermal runaway occurs, the opening of the solenoid valve 70 can be increased to increase the flow rate of the refrigerant flowing through the connecting pipe 60 into the liquid cooling plate 20, thereby improving the cooling efficiency of the battery cell 10.

[0060] In addition, it should be noted that when the battery cell 10 is at a high temperature and the above-mentioned refrigerant release component 30 releases the refrigerant in the liquid cooling plate 20, by increasing the opening of the solenoid valve 70, the refrigerant in the air-conditioning refrigerant supply system of the flow channel 21 of the refrigerant release component 30 can be continuously replenished into the flow channel 21, so that more refrigerant can flow to the battery cell 10 where thermal runaway occurs, avoiding the problem of poor cooling effect and slow speed of the battery cell 10 due to insufficient refrigerant reserves in the liquid cooling plate 20.

[0061] In order to achieve automatic opening and closing of the above-mentioned solenoid valve 70, optionally, the vehicle may also include a controller, a temperature sensor 2 and / or a pressure sensor 3. The temperature sensor 2 and / or the pressure sensor 3 are arranged in the battery pack 1 and are used to measure the temperature value and / or pressure value in the battery pack 1. The controller is respectively connected to the solenoid valve 70, the temperature sensor 2 and / or the pressure sensor 3 signals; the controller is used to adjust the opening of the solenoid valve 70 according to the parameters measured by the temperature sensor 2 and / or the pressure sensor 3.

[0062] In this way, when the temperature value and / or pressure value in the battery pack 1 detected by the temperature sensor 2 and / or the pressure sensor 3 is lower than the preset temperature value and / or pressure value, it indicates that the battery pack 1 is in normal operation. At this time, the solenoid valve 70 is in a closed state or a low flow state, thereby reducing the occupancy of the refrigerant flow channel 21 in the air-conditioning refrigerant supply system by the cooling of the battery cell 10; when thermal runaway occurs in the battery cell 10, the temperature and / or pressure in the battery pack 1 rises rapidly. At this time, the controller receives the temperature sensor 2 and / or the pressure sensor 3 set in the battery pack 1. When the pressure sensor 3 detects a signal that the temperature and / or pressure in the battery pack 1 is higher than the preset temperature and / or pressure value, the controller can control the solenoid valve 70 to be fully opened and in a large flow state, thereby improving the heat exchange effect on the battery cell 10. After the refrigerant release component 30 releases the refrigerant in the flow channel 21, the refrigerant in the air-conditioning refrigerant supply system can continuously replenish the refrigerant in the flow channel 21 through the connecting pipe 60, so that more refrigerant flows to the battery cell 10 where thermal runaway occurs, thereby achieving rapid cooling of the battery cell 10.

[0063] Moreover, as the refrigerant cools the battery cell 10 that has thermal runaway, when the temperature and pressure inside the battery drop to the preset temperature and pressure values, the controller can control the solenoid valve 70 to close again to avoid the refrigerant in the air conditioning refrigerant supply system from continuing to flow out and causing waste.

[0064] Optionally, the battery pack 1 also includes thermal insulation 80, which is positioned between the inner wall of the battery housing 40 and the liquid cooling plate 20. The thermal insulation 80 reduces heat loss from the battery cells 10 in cold environments, helping them maintain a suitable operating temperature range. In hot environments, the thermal insulation 80 reduces external heat transfer to the battery cells 10, preventing them from overheating. Furthermore, the thermal insulation 80 offers flame retardant and buffering properties, further enhancing the stability of the battery cells 10.

[0065] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0067] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A cooling system for a battery pack, characterized in that: include: A liquid cooling plate having a flow channel for a refrigerant therein, and configured to cool the battery cells; A refrigerant release component is arranged between the liquid cooling plate and the battery core, and the refrigerant release component is at least partially made of a thermoactive material. The refrigerant release component can release the refrigerant in the flow channel when the temperature of the battery core reaches a predetermined temperature threshold.

2. The cooling system according to claim 1, characterized in that The predetermined temperature threshold is 85°C to 95°C.

3. The cooling system according to claim 1, characterized in that The thermally activated material is a memory alloy.

4. The cooling system according to any one of claims 1 to 3, characterized in that: The refrigerant release assembly includes at least one puncture assembly, each of which includes a support seat and at least one puncture member arranged on the support seat, the support seat is made of thermal braking material, and the side of the support seat facing away from the puncture member is used to abut against the battery cell, and the end of the puncture member facing away from the battery cell abuts against the liquid cooling plate.

5. The cooling system according to claim 4, characterized in that The end of the piercing member facing away from the battery core is configured as a tapered tip.

6. The cooling system according to claim 4, characterized in that The refrigerant release assembly also includes a support plate, which includes a first large surface, a second large surface, and a side surface formed between the first large surface and the second large surface. The side surface of the support plate is connected to the battery shell. At least one puncture assembly is provided on the first large surface of the support plate, and the second large surface of the support plate is provided in contact with the battery cell.

7. The cooling system according to any one of claims 1 to 3, characterized in that: At least one drain port communicating with the flow channel is provided on a side wall of the liquid cooling plate on a side close to the battery cell. The refrigerant release assembly includes at least one blocking member and at least one thermally actuated member made of a thermally actuated material. The blocking member is used to block the drain port corresponding thereto, and the thermally actuated member blocks the drain port corresponding thereto. The thermally activated member is connected to the blocking member and can be deformed when the temperature of the battery core reaches a predetermined temperature threshold, so as to drive the blocking member to escape from the drain port.

8. The cooling system according to claim 7, characterized in that The refrigerant release assembly also includes a connecting seat, the thermal actuator and the sealing member are both arranged on the same side of the connecting seat, the connecting seat is arranged in the flow channel, and the ends of the thermal actuator and the sealing member facing away from the connecting seat are passed through the corresponding drain port.

9. The cooling system according to claim 8, characterized in that One end of the thermal actuator facing away from the connecting seat is flush with the outer wall of the liquid cooling plate where the drain port is formed, so that the end of the thermal actuator facing away from the connecting seat abuts against the battery cell; One end of the blocking member facing away from the connecting seat is flush with the outer wall of the liquid cooling plate where the drain port is formed, so that the one end of the blocking member facing away from the connecting seat abuts against the battery cell.

10. A battery pack, characterized in that: A cooling system comprising the cooling system according to any one of claims 1 to 9.

11. The battery pack according to claim 10, characterized in that: The battery pack includes a battery housing and a battery cell disposed in the battery housing, and the refrigerant release assembly is disposed between the battery cell and the liquid cooling plate.

12. A vehicle, characterized in that: The cooling system comprises the cooling system according to any one of claims 1 to 11 or the battery pack according to claim 10 or 11.

13. The vehicle according to claim 12, characterized in that The vehicle includes an air-conditioning refrigerant supply system, which is communicated with the flow channel of the liquid cooling plate to provide refrigerant to the flow channel.

14. The vehicle according to claim 13, characterized in that The vehicle further includes a connecting pipe and a solenoid valve, the air conditioning refrigerant supply system is connected to the flow channel through the connecting pipe, and the solenoid valve is arranged on the connecting pipe and is used to control the flow rate of the refrigerant flowing through the connecting pipe.

15. The vehicle according to claim 14, characterized in that The vehicle further includes a controller, a temperature sensor, and / or a pressure sensor, wherein the temperature sensor and / or the pressure sensor are disposed in the battery pack and are used to measure the temperature value and / or the pressure value in the battery pack, and the controller is respectively connected to the solenoid valve, the temperature sensor, and / or the pressure sensor for signal communication; The controller is used to adjust the opening of the solenoid valve according to the parameters measured by the temperature sensor and / or the pressure sensor.

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