Thermal management system, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a thermal management system, a battery pack and electric equipment, and relates to the technical field of power batteries. The heat management system comprises a control valve and at least two heat exchange plates, the at least two heat exchange plates are used for being arranged on the battery module, and the control valve communicates with the at least two heat exchange plates at the same time and is used for independently controlling the flow of a refrigerant input into each heat exchange plate. According to the thermal management system, the conditions of battery short circuit and secondary thermal runaway caused by refrigerant leakage can be avoided, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a thermal management system, a battery pack and electrical equipment. Background Art

[0002] With the continuous development of pure electric vehicles and battery technology, the requirements for thermal management of battery modules are becoming increasingly higher. The existing technology generally uses water cooling to perform thermal management on battery modules, that is, a heat exchange plate is arranged inside the battery, and a coolant medium is circulated into the heat exchange plate to take away the heat generated during battery charging and discharging.

[0003] However, during the long-term use of battery modules, refrigerant leakage is prone to occur in the heat exchange plates and liquid cooling pipes. Once leakage occurs, a large amount of refrigerant will be lost, causing dangerous situations such as battery short circuit and secondary thermal runaway. Utility Model Content

[0004] The purpose of the utility model is to provide a thermal management system, a battery pack and an electrical device, which can avoid battery short circuit and secondary thermal runaway caused by refrigerant leakage, thereby improving the safety of the battery pack.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a thermal management system, comprising:

[0007] At least two heat exchange plates, the at least two heat exchange plates are used to be arranged in the battery module; and

[0008] A control valve is connected to the at least two heat exchange plates at the same time and is used to independently control the flow of refrigerant input into each of the heat exchange plates.

[0009] In an optional embodiment, the at least two heat exchange plates include a first heat exchange plate and a second heat exchange plate, and the first heat exchange plate and the second heat exchange plate are used to be respectively arranged on two opposite sides of the battery module;

[0010] The control valve has an input interface, a first output interface and a second output interface, the input interface is used to communicate with an external refrigerant source, the first output interface is connected to the first heat exchange plate, and the second output interface is connected to the second heat exchange plate; and the input interface is also used to independently connect or disconnect with the first output interface and the second output interface.

[0011] In an optional embodiment, the second output interface is coaxially arranged with the input interface, and the first output interface is inclined with respect to the input interface.

[0012] In an optional embodiment, the thermal management system further includes an input pipeline and an output pipeline, the input pipeline is simultaneously connected to the refrigerant input ports of the at least two heat exchange plates, and the control valve is arranged on the input pipeline; the output pipeline is simultaneously connected to the refrigerant output ports of the at least two heat exchange plates.

[0013] In an optional embodiment, the thermal management system further includes a leakage detection component, which is used to communicate with the battery management system and output a status signal representing the refrigerant in the at least two heat exchange plates.

[0014] In an optional embodiment, the thermal management system further includes a temperature detection element, which is used to communicate with a battery management system and output a temperature signal representing the battery module.

[0015] In a second aspect, the utility model provides a battery pack, comprising a battery module, a box body and a thermal management system as described in any one of the aforementioned embodiments, wherein the battery module is arranged in the box body, and the at least two heat exchange plates are used to heat or dissipate heat for the battery module.

[0016] In an optional embodiment, at least one of the heat exchange plates is disposed on the battery module, and at least one of the heat exchange plates is disposed on the outer wall of the box.

[0017] In an optional embodiment, the battery module includes an electrical connecting plate, a thermal conductive pad, and a plurality of stacked battery cells, each of the battery cells is provided with the electrical connecting plate on one side close to the heat exchange plate, and the electrical connecting plate is in contact with the heat exchange plate through the thermal conductive pad.

[0018] In an optional embodiment, the box body includes a bottom shell and a cover plate, and the cover plate and at least one of the heat exchange plates are respectively arranged on opposite sides of the bottom shell, so that the cover plate, the bottom shell and at least one of the heat exchange plates together form a accommodating cavity, and the battery module is accommodated in the accommodating cavity; at least one of the heat exchange plates is located between the cover plate and the battery module.

[0019] In an optional embodiment, the battery pack further includes an explosion-proof valve, which is arranged on the bottom shell; a first exhaust channel is provided between the heat exchange plate and the battery module, and a second exhaust channel is provided between the battery module and the bottom shell, and the first exhaust channel, the second exhaust channel and the explosion-proof valve are connected in sequence.

[0020] In an optional embodiment, the battery pack further includes a partition, which is disposed in the accommodating cavity to separate the accommodating cavity into a module compartment and an electrical compartment, the battery module is accommodated in the module compartment, the control valve is disposed in the electrical compartment; and the explosion-proof valve is located on a side of the module compartment away from the electrical compartment.

[0021] In an optional embodiment, at least one of the heat exchange plates is fixedly connected to a side of the cover plate close to the battery module, and a refrigerant channel for circulating refrigerant is formed between the cover plate and at least one of the heat exchange plates.

[0022] In a third aspect, the utility model provides an electrical device, comprising a battery pack as described in any one of the aforementioned embodiments.

[0023] The beneficial effects of the embodiments of the utility model include:

[0024] The thermal management system includes a control valve and at least two heat exchange plates, at least two heat exchange plates are used to be set in the battery module, the control valve is connected to the at least two heat exchange plates at the same time, and is used to independently control the refrigerant flow rate input to each heat exchange plate. In other words, the size of the refrigerant flow rate in each heat exchange plate is independently controlled by the control valve. When any one or more heat exchange plates leak refrigerant, the control valve can independently control the refrigerant flow rate input to the one or more heat exchange plates, that is, control the refrigerant not to flow into the heat exchange plate, thereby avoiding battery short circuit and secondary thermal runaway caused by a large amount of refrigerant leakage, thereby improving the safety of the battery pack.

[0025] The battery pack includes a thermal management system with all the benefits of the thermal management system.

[0026] The electric device includes a battery pack and has all the beneficial effects of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 An exploded view of a battery pack provided in an embodiment of the utility model;

[0029] Figure 2 A schematic diagram of a portion of the structure of a battery pack provided in an embodiment of the utility model;

[0030] Figure 3 A schematic diagram of the structure of a thermal management system provided by an embodiment of the utility model;

[0031] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0032] Figure 5A schematic diagram of the structure of a control valve provided in an embodiment of the utility model;

[0033] Figure 6 A cross-sectional view of a battery pack provided by an embodiment of the utility model;

[0034] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0035] Figure 8 This is a schematic structural diagram of a box provided in an embodiment of the utility model.

[0036] Icons: 10-battery module; 11-electrical connecting plate; 12-thermal pad; 20-first heat exchange plate; 21-first refrigerant input port; 22-first refrigerant output port; 23-refrigerant channel; 30-second heat exchange plate; 31-second refrigerant input port; 32-second refrigerant output port; 40-input pipeline; 41-control valve; 411-input interface; 412-first output interface; 413-second output interface; 50-output pipeline; 60-bottom shell; 61-accommodating chamber; 610-module compartment; 612-electrical compartment; 70-cover plate; 80-partition; 90-explosion-proof valve; a1-first exhaust channel. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] As described in the background technology, with the continuous development of pure electric vehicles and battery technology, the thermal management requirements for battery modules are getting higher and higher. At present, the existing technology generally uses water cooling to manage the thermal performance of battery modules, that is, a heat exchange plate is set inside the battery, and a refrigerant medium is circulated into the heat exchange plate to take away the heat generated during battery charging and discharging. However, during the long-term use of the battery module, the heat exchange plate and the liquid cooling pipe are prone to refrigerant leakage. Once leakage occurs, a large amount of refrigerant will be lost, causing dangerous situations such as battery short circuit and secondary thermal runaway.

[0044] Based on this, please refer to Figure 1-Figure 8 The embodiments of the utility model provide a thermal management system, a battery pack and an electric device, which can effectively improve the above-mentioned technical problems, that is, it can avoid battery short circuit and secondary thermal runaway caused by refrigerant leakage, and improve the safety of the battery pack. The thermal management system, battery pack and electric device will be described in detail below.

[0045] An embodiment of the utility model provides an electrical device, which includes a battery pack and other electrical devices. The battery pack is used to provide electrical energy to the electrical devices, that is, the electrical device uses the battery pack as a power source.

[0046] The electrical equipment may be, but is not limited to: laptop computers, pen-type computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD TVs, watches, sports bracelets, portable cleaners, portable CD players, transceivers, electronic notepads, calculators, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, lighting fixtures, toys, game consoles, power tools, flashlights, and lithium-ion capacitors, etc.

[0047] When the electrical device is a vehicle, the vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle, for example, the battery pack may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery pack to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0048] Specifically, in this embodiment, the battery pack can be understood as a secondary battery, which can be applied to various fields such as new energy vehicles, energy storage devices and electrical equipment.

[0049] Please refer to Figure 1 and Figure 2 , Figure 1 An exploded view of the battery pack provided in this embodiment, Figure 2 A partial structural diagram of the battery pack provided in this embodiment, combined with Figure 1 and Figure 2 The battery pack includes a thermal management system, a box body and a battery module 10. The battery module 10 is arranged in the box body. The thermal management system is used to perform thermal management on the battery module 10, for example, performing a series of treatments such as cooling and dissipating heat, or heating the battery module 10 to ensure that the battery performance is fully exerted, thereby improving the service life of the power battery and reducing the energy loss of the battery.

[0050] Specifically, please refer to Figure 3 , Figure 3 The schematic diagram of the thermal management system provided in this embodiment is combined with Figure 3The thermal management system includes a control valve 41 and at least two heat exchange plates. The at least two heat exchange plates are used to be arranged in the battery module 10. The control valve 41 is connected to the at least two heat exchange plates at the same time, and is used to independently control the refrigerant flow rate input to each heat exchange plate. In other words, the size of the refrigerant flow rate in each heat exchange plate is independently controlled by the control valve 41. When any one or more heat exchange plates leak refrigerant, the control valve 41 can independently control the refrigerant flow rate input to the one or more heat exchange plates, that is, control the refrigerant not to flow into the heat exchange plate, thereby avoiding battery short circuit and secondary thermal runaway caused by a large amount of refrigerant leakage, thereby improving the safety of the battery pack.

[0051] Please refer to Figure 4 , Figure 4 for Figure 3 The local enlarged view of A in the middle, combined with Figure 1-Figure 4 In this embodiment, at least two heat exchange plates include a first heat exchange plate 20 and a second heat exchange plate 30, and the first heat exchange plate 20 and the second heat exchange plate 30 are respectively arranged on opposite sides of the battery module 10; the control valve 41 has an input interface 411, a first output interface 412 and a second output interface 413, the input interface 411 is used to communicate with an external refrigerant source, the first output interface 412 is connected to the first heat exchange plate 20, and the second output interface 413 is connected to the second heat exchange plate 30; and the input interface 411 is also used to independently connect or cut off the first output interface 412 and the second output interface 413.

[0052] During the actual operation of the battery pack, the input interface 411 is connected to the first output interface 412 and the second output interface 413 at the same time, and the refrigerant provided by the external refrigerant source enters the control valve 41 through the input interface 411, and then a part of the refrigerant is input to the first heat exchange plate 20 through the first output interface 412, and the other part of the refrigerant is input to the second heat exchange plate 30 through the second output interface 413, thereby realizing cooling or heating of the battery module 10. When the refrigerant leaks from the first heat exchange plate 20, the control valve 41 cuts off the input interface 411 and the first output interface 412, so that the refrigerant will no longer flow into the first heat exchange plate 20; similarly, when the refrigerant leaks from the second heat exchange plate 30, the control valve 41 cuts off the input interface 411 and the second output interface 413, so that the refrigerant will no longer flow into the second heat exchange plate 30, thereby avoiding the occurrence of dangerous situations such as battery short circuit and secondary thermal runaway due to a large amount of refrigerant loss, thereby improving safety.

[0053] It should be noted that, in the present embodiment, the heat exchange plate includes a first heat exchange plate 20 and a second heat exchange plate 30, and correspondingly, the control valve 41 is a three-way control valve, which can independently control the conduction and cutoff of the refrigerant flow of the two heat exchange plates; of course, in other embodiments, the number of heat exchange plates can also be three, four, etc., and the control valve 41 corresponds to a four-way control valve, a five-way control valve, etc.

[0054] In addition, it should be noted that the control valve 41 in this embodiment is specifically a flow control valve, that is, the control valve 41 can independently control the refrigerant flow output by the first output interface 412 and the second output interface 413. In this way, when the temperature of the battery module 10 close to the first heat exchange plate 20 is too high, the control valve 41 can control the refrigerant flow output by the first output interface 412 to increase, so that the refrigerant flow through the first heat exchange plate 20 is larger and the flow rate is faster, thereby greatly improving the cooling effect of the first heat exchange plate 20 on the battery module 10. Similarly, when the temperature of the battery module 10 close to the second heat exchange plate 30 is too high, the control valve 41 can control the refrigerant flow output by the second output interface 413 to increase, so that the refrigerant flow through the second heat exchange plate 30 is larger and the flow rate is faster, thereby greatly improving the cooling effect of the second heat exchange plate 30 on the battery module 10.

[0055] Please continue to combine Figure 3 and Figure 4 The thermal management system further includes an input pipeline 40 and an output pipeline 50. The input pipeline 40 is simultaneously connected to the refrigerant input ports of at least two heat exchange plates, and a control valve 41 is disposed on the input pipeline 40; the output pipeline 50 is simultaneously connected to the refrigerant output ports of at least two heat exchange plates. Specifically in this embodiment, the first heat exchange plate 20 has a first refrigerant input port 21 and a first refrigerant output port 22, and the first output interface 412, the first refrigerant input port 21, the first refrigerant output port 22, and the output pipeline 50 are sequentially connected; the second heat exchange plate 30 has a second refrigerant input port 31 and a second refrigerant output port 32, and the second output interface 413, the second refrigerant input port 31, the second refrigerant output port 32, and the output pipeline 50 are sequentially connected.

[0056] It should be noted that the number of the first refrigerant input ports 21 and the first refrigerant output ports 22 can be one or more. Specifically, in the present embodiment, the number of the first refrigerant input ports 21 and the first refrigerant output ports 22 are both one. It is easy to understand that when the number of the first refrigerant input ports 21 is multiple, the multiple first refrigerant input ports 21 are connected to the first output interface 412 of the control valve 41 through a pipeline, so that the refrigerant output through the first output interface 412 enters the first heat exchange plate 20 from each first refrigerant input port 21, which can increase the refrigerant flow path, improve the heat exchange effect, and facilitate the control of the flow rate. When the number of the first refrigerant output ports 22 is multiple, the multiple first refrigerant output ports 22 are connected to the output pipeline 50, so that the refrigerant in the first heat exchange plate 20 enters the output pipeline 50 from each first refrigerant output port 22 and is discharged.

[0057] Similarly, the number of the second refrigerant input port 31 and the second refrigerant output port 32 can be one or more. Specifically, in the present embodiment, the number of the second refrigerant input port 31 and the second refrigerant output port 32 are both two. The connection relationship between the plurality of second refrigerant input ports 31 and the second refrigerant output ports 32 and the second output interface 413 of the control valve 41 and the output pipeline 50 is respectively referred to the relevant settings of the first refrigerant input port 21 and the first refrigerant output port 22, and will not be described in detail here.

[0058] For further information, please refer to Figure 5 , Figure 5 The schematic diagram of the structure of the control valve 41 provided in this embodiment, combined with Figure 4 and Figure 5 In this embodiment, the second output interface 413 is coaxially arranged with the input interface 411, and the first output interface 412 is inclined with the input interface 411. This arrangement facilitates the connection of the first output interface 412 with the first heat exchange plate 20 through a pipeline, and facilitates the connection of the second output interface 413 with the second heat exchange plate 30 through a pipeline, and also reduces the length of the circulation path of the refrigerant, saving the cost of pipeline layout.

[0059] The battery pack also includes a battery management system (not shown in the figure), which communicates with the control valve 41 to control the conduction or cutoff of the input interface 411 in the control valve 41 and the first output interface 412 and the second output interface 413; and in order to better detect the flow state of the refrigerant in the heat exchange plate, in this embodiment, the thermal management system also includes a leakage detection device (not shown in the figure), which is used to communicate with the battery management system and output a status signal representing the refrigerant in at least two heat exchange plates. The battery management system is used to obtain the status signal and control the conduction or cutoff of the input interface 411 and the first output interface 412 and the second output interface 413.

[0060] Specifically for this embodiment, the leakage detection component monitors the state of the refrigerant in the first heat exchange plate 20 and the second heat exchange plate 30 in real time. When the refrigerant in the first heat exchange plate 20 or the second heat exchange plate 30 leaks, the leakage detection component outputs the state signal of the refrigerant to the battery management system. The battery management system obtains the state signal and controls the input interface 411 of the control valve 41 to be cut off from the first output interface 412, or to be cut off from the second output interface 413, thereby preventing the refrigerant from continuing to flow into the first heat exchange plate 20 or the second heat exchange plate 30, thereby avoiding the occurrence of dangerous situations such as battery short circuit and secondary thermal runaway due to a large amount of refrigerant loss, thereby improving safety.

[0061] It should be noted that the leakage detection component may adopt other detection components such as water immersion sensors, which is not limited here.

[0062] Please continue to combine Figure 1 At least one heat exchange plate is arranged on the battery module 10, and at least one heat exchange plate is arranged on the outer wall of the box. Specifically in this embodiment, the first heat exchange plate 20 is arranged on the battery module 10, and the second heat exchange plate 30 is arranged on the outer wall of the box. The first heat exchange plate 20 directly contacts one side of the battery module 10 for heating or heat dissipation, while the second heat exchange plate 30 heats or dissipates the other side of the battery module 10 through the box.

[0063] It should be noted that in other embodiments, a heat exchange plate may be provided on opposite sides of the battery module 10, that is, a heat exchange plate is provided on the top of the battery module 10, and a heat exchange plate is also provided between the battery module 10 and the box body, and a heat exchange plate may also be provided on the outer wall of the box body for further heating or heat dissipation; of course, in some other possible implementations, heat exchange plates may be provided on all sides of the battery module 10, which can further improve the heat exchange effect. Therefore, the number and specific location of the heat exchange plates need to be determined according to actual design requirements.

[0064] Please refer to Figure 6 and Figure 7 , Figure 6 A cross-sectional view of the battery pack provided in this embodiment, Figure 7 for Figure 6 The local enlarged picture of B in the middle, combined with Figure 6 and Figure 7 The battery module 10 includes an electrical connection sheet 11, a thermal pad 12, and a plurality of stacked battery cells (not shown). Each battery cell is provided with an electrical connection sheet 11 on one side close to the heat exchange plate, and the electrical connection sheet 11 contacts the heat exchange plate through the thermal pad 12. Specifically, in this embodiment, the electrical connection sheet 11 is disconnected from the first heat exchange plate 20 through the thermal pad 12, so that the first heat exchange plate 20 is used to cool or heat the electrical connection sheet 11.

[0065] It should be noted that the electrical connection sheet 11 can be a copper bar or an aluminum bar, etc., which is not limited here.

[0066] Furthermore, the thermal management system also includes a temperature detection component (not shown), which is used to communicate with the battery management system and output a temperature signal representing the battery module 10, and the battery management system is used to obtain the temperature signal. Specifically, the temperature detection component is used to detect the temperature of the electrical connection piece 11. When the detected temperature exceeds a preset value, the battery management system controls the control valve 41 to increase the refrigerant flow output by the first output interface 412, thereby enhancing the cooling effect on the electrical connection piece 11 and preventing the electrical connection piece 11 from being continuously at high temperature.

[0067] It should be noted that the temperature detection component can be a temperature sensor or other detection components, which is not limited here.

[0068] Please continue to combine Figure 1 The box body includes a bottom shell 60 and a cover plate 70. The cover plate 70 and at least one heat exchange plate are respectively arranged on opposite sides of the bottom shell 60, so that the cover plate 70, the bottom shell 60 and the at least one heat exchange plate are enclosed together to form a receiving cavity 61, and the battery module 10 is accommodated in the receiving cavity 61; at least one heat exchange plate is located between the cover plate 70 and the battery module 10. Specifically in this embodiment, the cover plate 70 and the second heat exchange plate 30 are respectively arranged on opposite sides of the bottom shell 60, so that the cover plate 70, the bottom shell 60 and the second heat exchange plate 30 are enclosed together to form a receiving cavity 61, and the first heat exchange plate 20 and the battery module 10 are accommodated in the receiving cavity 61; and the first heat exchange plate 20 is located between the cover plate 70 and the battery module 10. In this way, the second heat exchange plate 30 plays a role in heat exchange for the battery module 10 on the one hand, and plays a role in covering and forming the receiving cavity 61 on the other hand, which is conducive to reducing the overall thickness of the battery pack, reducing the weight of the battery pack, and improving the lightweight level of the battery pack.

[0069] Furthermore, at least one heat exchange plate is fixedly connected to the side of the cover plate 70 close to the battery module 10, and a refrigerant channel 23 for the circulation of refrigerant is formed between the cover plate 70 and the at least one heat exchange plate. Specifically in this embodiment, the first heat exchange plate 20 is fixedly connected to the side of the cover plate 70 close to the battery module 10, and a refrigerant channel 23 for the circulation of refrigerant is formed between the first heat exchange plate 20 and the cover plate 70. In this way, the refrigerant flowing out of the first output interface 412 of the control valve 41 enters the refrigerant channel 23, then cools the battery module 10, and is then discharged through the output pipeline 50.

[0070] It can be understood that the first heat exchange plate 20 and the cover plate 70 are combined to form the refrigerant channel 23. The cover plate 70 plays the role of covering to form the accommodating cavity 61 on the one hand, and also plays the role of combining to form the refrigerant channel 23 on the other hand, which is also beneficial to reduce the overall thickness of the battery pack, reduce the weight of the battery pack, and further improve the lightweight level of the battery pack.

[0071] It should be noted that the first heat exchange plate 20 may be formed into a groove by stamping. After the first heat exchange plate 20 is fixedly connected to the cover plate 70 , the cover plate 70 seals the groove on the first heat exchange plate 20 , thereby forming the refrigerant channel 23 .

[0072] When thermal runaway occurs in the battery cell, in order to facilitate the discharge of the gas generated by thermal runaway, please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the box provided in this embodiment, combined with Figure 6-Figure 8 The battery pack also includes an explosion-proof valve 90, which is disposed on the bottom shell 60; a first exhaust channel a1 is provided between the heat exchange plate and the battery module 10, and a second exhaust channel is provided between the battery module 10 and the bottom shell 60. The first exhaust channel a1, the second exhaust channel and the explosion-proof valve 90 are connected in sequence. In this way, the high-temperature gas generated when the battery cell undergoes thermal runaway passes through the first exhaust channel a1 and the second exhaust channel in sequence and is discharged from the explosion-proof valve 90 to the outside of the box, thereby releasing the pressure in the accommodating chamber 61 and avoiding explosion.

[0073] It should be noted that the number of explosion-proof valves 90 can be one or more, which is not limited here.

[0074] Please continue to combine Figure 1 and Figure 2 In this embodiment, the battery pack also includes a partition 80, which is arranged in the accommodating chamber 61 to divide the accommodating chamber 61 into a module compartment 610 and an electrical compartment 612, the battery module 10 is accommodated in the module compartment 610, and the control valve 41 is arranged in the electrical compartment 612; and the explosion-proof valve 90 is located on the side of the module compartment 610 away from the electrical compartment 612.

[0075] It is easy to understand that the electrical compartment 612 can also accommodate the input pipeline 40, the output pipeline 50, the battery pipeline system and other electrical components, including but not limited to high-voltage boxes, busbars and wiring harnesses. At the same time, the electrical compartment 612 is located on the side of the module compartment 610 away from the explosion-proof valve 90, so that when the battery cell has thermal runaway, the high-temperature gas generated flows from the first exhaust channel a1 to the direction away from the electrical compartment 612 into the second exhaust channel, and then is discharged to the outside of the box by the explosion-proof valve 90, thereby preventing the high-temperature gas from entering the electrical compartment 612 and causing damage to the electrical components, the input pipeline 40 and the output pipeline 50 and other components, so that the first heat exchange plate 20 and the second heat exchange plate 30 can also keep the battery module 10 cool when thermal runaway occurs, avoiding dangerous situations such as battery short circuit and secondary thermal runaway.

[0076] It should be noted that, in this embodiment, the bottom shell 60 adopts a rectangular profile frame, and the two ends of the partition 80 are fixedly connected to the two opposite frames of the rectangular profile frame; the cover plate 70 is roughly rectangular and covers one side of the rectangular profile frame; the second heat exchange plate 30 is also roughly rectangular and covers the other side of the profile frame. Of course, in other embodiments, the bottom shell 60, the cover plate 70 and the second heat exchange plate 30 can also be other shapes, which are not limited here.

[0077] Furthermore, the cover plate 70 and the bottom shell 60 are fixed by bolts, and a sealing ring is provided between the cover plate 70 and the bottom shell 60 to seal the gap between the cover plate 70 and the bottom shell 60. Similarly, the second heat exchange plate 30 and the bottom shell 60 are fixed by bolts, and a sealing ring is also provided between the second heat exchange plate 30 and the bottom shell 60 to seal the gap between the second heat exchange plate 30 and the bottom shell 60.

[0078] In summary, the embodiments of the utility model provide a thermal management system, a battery pack and an electrical device. The thermal management system includes a control valve 41 and at least two heat exchange plates. The at least two heat exchange plates are used to be arranged in the battery module 10. The control valve 41 is connected to the at least two heat exchange plates at the same time, and is used to independently control the refrigerant flow rate input to each heat exchange plate. In other words, the size of the refrigerant flow rate in each heat exchange plate is independently controlled by the control valve 41. When any one or more heat exchange plates leak refrigerant, the control valve 41 can independently control the refrigerant flow rate input to the one or more heat exchange plates, that is, control the refrigerant not to flow into the heat exchange plate, thereby avoiding battery short circuit and secondary thermal runaway caused by a large amount of refrigerant leakage, thereby improving the safety of the battery pack.

[0079] The battery pack includes a thermal management system. The battery module 10 is arranged in a box. At least two heat exchange plates are used to heat or dissipate heat for the battery module 10. The battery pack has all the functions and beneficial effects of the thermal management system.

[0080] The electric device includes a battery pack, which has all the functions and beneficial effects of the battery pack.

[0081] The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A thermal management system, characterized in that: include: At least two heat exchange plates, the at least two heat exchange plates being used to be arranged in the battery module (10); as well as A control valve (41), the control valve (41) is simultaneously connected to the at least two heat exchange plates and is used to independently control the flow of refrigerant input into each of the heat exchange plates.

2. The thermal management system according to claim 1, characterized in that: The at least two heat exchange plates include a first heat exchange plate (20) and a second heat exchange plate (30), wherein the first heat exchange plate (20) and the second heat exchange plate (30) are respectively arranged on two opposite sides of the battery module (10); The control valve (41) has an input interface (411), a first output interface (412) and a second output interface (413); the input interface (411) is used to communicate with an external refrigerant source, the first output interface (412) is connected to the first heat exchange plate (20), and the second output interface (413) is connected to the second heat exchange plate (30); and the input interface (411) is also used to independently connect or disconnect with the first output interface (412) and the second output interface (413).

3. The thermal management system according to claim 2, characterized in that: The second output interface (413) is coaxially arranged with the input interface (411), and the first output interface (412) is inclinedly arranged with respect to the input interface (411).

4. The thermal management system according to claim 1, characterized in that: The thermal management system further comprises an input pipeline (40) and an output pipeline (50), wherein the input pipeline (40) is simultaneously connected to the refrigerant input ports of the at least two heat exchange plates, and the control valve (41) is arranged on the input pipeline (40); and the output pipeline (50) is simultaneously connected to the refrigerant output ports of the at least two heat exchange plates.

5. The thermal management system according to claim 1, characterized in that: The thermal management system further includes a leakage detection component, which is used to communicate with the battery management system and output a state signal representing the refrigerant in the at least two heat exchange plates.

6. The thermal management system according to claim 1, characterized in that: The thermal management system further comprises a temperature detection element, which is used to communicate with a battery management system and output a temperature signal representing the temperature of the battery module (10).

7. A battery pack, characterized in that: It comprises a battery module (10), a box and the thermal management system according to any one of claims 1 to 6, wherein the battery module (10) is arranged in the box, and the at least two heat exchange plates are used to heat or dissipate heat for the battery module (10).

8. The battery pack according to claim 7, characterized in that: At least one of the heat exchange plates is arranged on the battery module (10), and at least one of the heat exchange plates is arranged on the outer wall of the box.

9. The battery pack according to claim 8, characterized in that: The battery module (10) comprises an electrical connection sheet (11), a thermal pad (12), and a plurality of stacked battery cells, wherein the electrical connection sheet (11) is provided on a side of each battery cell close to the heat exchange plate, and the electrical connection sheet (11) is in contact with the heat exchange plate via the thermal pad (12).

10. The battery pack according to claim 7, characterized in that: The box body comprises a bottom shell (60) and a cover plate (70); the cover plate (70) and at least one of the heat exchange plates are respectively arranged on two opposite sides of the bottom shell (60), so that the cover plate (70), the bottom shell (60) and at least one of the heat exchange plates together form a receiving cavity (61); the battery module (10) is received in the receiving cavity (61); and at least one of the heat exchange plates is located between the cover plate (70) and the battery module (10).

11. The battery pack according to claim 10, characterized in that: The battery pack further comprises an explosion-proof valve (90), wherein the explosion-proof valve (90) is arranged on the bottom shell (60); a first exhaust channel (a1) is provided between the heat exchange plate and the battery module (10), and a second exhaust channel is provided between the battery module (10) and the bottom shell (60); the first exhaust channel (a1), the second exhaust channel and the explosion-proof valve (90) are connected in sequence.

12. The battery pack according to claim 11, characterized in that: The battery pack further comprises a partition (80), wherein the partition (80) is arranged in the accommodating chamber (61) so as to separate the accommodating chamber (61) into a module compartment (610) and an electrical compartment (612); the battery module (10) is accommodated in the module compartment (610), the control valve (41) is arranged in the electrical compartment (612); and the explosion-proof valve (90) is located on a side of the module compartment (610) away from the electrical compartment (612).

13. The battery pack according to claim 10, characterized in that: At least one of the heat exchange plates is fixedly connected to a side of the cover plate (70) close to the battery module (10), and a refrigerant channel (23) for refrigerant circulation is formed between the cover plate (70) and at least one of the heat exchange plates.

14. An electrical device, characterized in that: A battery pack comprising any one of claims 7 to 13.

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