Battery Thermal Management System

Abstract

The present invention relates to a battery thermal management system, which includes a battery box, a liquid cooling plate, a detector, a blasting member and a liquid replenishing mechanism. Under normal conditions of the battery, the liquid replenishing mechanism is in a circulating state, and the coolant circulates between the liquid cooling plate and the liquid replenishing mechanism. The battery is located on the liquid cooling plate, and the coolant circulating inside the liquid cooling plate can dissipate heat from the battery. When the battery undergoes thermal runaway, the detector detects the change in the state of the battery. The liquid replenishing mechanism switches from the circulating state to the liquid replenishing state according to the detection information of the detector, and the blasting member blasts the liquid cooling plate according to the detection information of the detector, so that the inside of the liquid cooling plate is communicated with the inner cavity. The liquid replenishing mechanism inputs the coolant into the liquid cooling plate, and since the liquid cooling plate is communicated with the inner cavity and the coolant in the liquid cooling plate will not flow back to the liquid replenishing mechanism, the coolant will enter the inner cavity and accumulate, and the battery that has undergone thermal runaway will be immersed in the coolant, thereby effectively suppressing the thermal runaway of the battery and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of battery temperature management, and particularly to a battery thermal management system. Background Art

[0002] With the gradual increase of battery energy density, the safety of batteries has become a hot topic for research in the next stage.

[0003] Combustion and explosion caused by batteries are generally due to thermal runaway of the batteries. Currently, common suppression methods for thermal runaway of batteries include heat insulation and spraying fire extinguishing agents. Heat insulation can avoid heat transfer to other battery cells in a short time, while spraying fire extinguishing agents can only prevent the battery from burning. Both methods cannot effectively suppress thermal runaway and have low safety. Summary of the Invention

[0004] Based on this, it is necessary to provide a battery thermal management system that can effectively suppress thermal runaway and has high safety in view of the problem that the existing methods of heat insulation and spraying fire extinguishing agents cannot effectively suppress thermal runaway when the battery is in thermal runaway.

[0005] A battery thermal management system includes:

[0006] A battery box having an inner cavity for placing batteries;

[0007] A liquid cooling plate disposed in the inner cavity, with the battery located on the liquid cooling plate, and the liquid cooling plate having coolant inside;

[0008] A detector disposed in the inner cavity for detecting the state of the battery; and

[0009] An explosive member disposed on the liquid cooling plate and electrically connected to the detector, the explosive member being used to blast the liquid cooling plate to communicate the inside of the liquid cooling plate with the inner cavity; and

[0010] A liquid replenishing mechanism communicating with the inside of the liquid cooling plate and electrically connected to the detector, the liquid replenishing mechanism including a circulating state and a liquid replenishing state;

[0011] When the liquid replenishing mechanism is in the circulating state, the coolant circulates between the liquid replenishing mechanism and the inside of the liquid cooling plate;

[0012] When the liquid replenishing mechanism is in the liquid replenishing state, the liquid replenishing mechanism is used to input the coolant into the inside of the liquid cooling plate.

[0013] By setting up the above-mentioned battery thermal management system, when the battery is normal, the liquid replenishing mechanism is in a circulating state, and the coolant circulates between the liquid cooling plate and the liquid replenishing mechanism. The battery is located on the liquid cooling plate, and the coolant circulating inside the liquid cooling plate can dissipate heat from the battery. When the battery undergoes thermal runaway, the detector detects the change in the battery state. The liquid replenishing mechanism switches from the circulating state to the liquid replenishing state according to the detection information of the detector, and the blasting member blasts the liquid cooling plate according to the detection information of the detector, making the inside of the liquid cooling plate communicate with the inner cavity. The liquid replenishing mechanism inputs the coolant into the liquid cooling plate, and since the liquid cooling plate communicates with the inner cavity and the coolant in the liquid cooling plate does not flow back to the liquid replenishing mechanism, the coolant will enter the inner cavity and accumulate, and the battery with thermal runaway will be immersed in the coolant, thereby effectively suppressing the thermal runaway of the battery and improving safety.

[0014] In one embodiment, the battery thermal management system further includes a first partition plate, which is disposed in the inner cavity to divide the inner cavity into a first space and a second space. The bottoms of the first space and the second space are not in communication with each other, and the liquid cooling plate is located in the first space.

[0015] In one embodiment, the battery thermal management system further includes a second partition plate, which is disposed in the first space and is used to divide the first space into a storage space and a third space. The bottoms of the storage space and the third space are not in communication with each other, and the liquid cooling plate is located in the storage space.

[0016] In one embodiment, the first partition plate and the second partition plate are parallel to each other and are arranged at intervals along the length direction of the battery box, and the storage space is located between the first partition plate and the second partition plate.

[0017] In one embodiment, the battery thermal management system further includes a fire extinguisher and at least two nozzles. The fire extinguisher is connected to each nozzle, and the fire extinguisher is electrically connected to the detector. At least two nozzles are disposed in the inner cavity and are oriented towards the battery.

[0018] In one embodiment, the battery thermal management system further includes a safety valve, which is disposed on the battery box and is used to open to communicate the inner cavity with the outside when the pressure in the inner cavity is greater than a preset pressure value.

[0019] In one embodiment, the battery box includes a bottom plate and a box body. The box body covers the bottom plate to enclose and form the inner cavity, and the liquid cooling plate is disposed on the bottom plate.

[0020] In one embodiment, the liquid replenishing mechanism includes a storage member, an inlet pipe, an outlet pipe, a power member, and a control valve. The storage member is used to store the coolant. The power member is connected to the storage member. The inlet pipe is connected between the power member and the liquid cooling plate. The power member is used to convey the coolant in the storage member to the inlet pipe. The outlet pipe is connected between the liquid cooling plate and the storage member. Both the inlet pipe and the outlet pipe are used to communicate the interior of the storage member with the liquid cooling plate. The control valve is disposed on the outlet pipe;

[0021] When the control valve is opened, the coolant in the liquid cooling plate can flow into the storage member through the outlet pipe; when the control valve is closed, the outlet pipe is blocked off.

[0022] In one embodiment, the liquid replenishing mechanism further includes a check valve. The check valve is disposed on the inlet pipe and is used to allow the coolant to flow into the interior of the liquid cooling plate through the inlet pipe.

[0023] A battery thermal management system includes:

[0024] A battery box having an inner cavity for placing batteries;

[0025] A liquid cooling plate disposed on the bottom wall of the inner cavity. The battery is located above the liquid cooling plate. The interior of the liquid cooling plate has coolant;

[0026] A detector disposed on the battery box for detecting the battery; and

[0027] A connection valve disposed on the liquid cooling plate and electrically connected to the detector for communicating or blocking off the inner cavity and the interior of the liquid cooling plate; and

[0028] A liquid replenishing mechanism communicating with the interior of the liquid cooling plate and electrically connected to the detector. The liquid replenishing mechanism includes a circulating state and a liquid replenishing state;

[0029] When the liquid replenishing mechanism is in the circulating state, the coolant circulates between the liquid replenishing mechanism and the liquid cooling plate;

[0030] When the liquid replenishing mechanism is in the liquid replenishing state, the liquid replenishing mechanism is used to input the coolant into the interior of the liquid cooling plate. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the principle of the battery thermal management system provided by an embodiment of the present invention. Specific embodiments

[0033] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0039] As Figure 1 shown, a battery thermal management system 100 provided by an embodiment of the present invention includes a battery box 10, a liquid cooling plate 20, a detector 30, a blasting member 40 and a liquid replenishing mechanism 50.

[0040] The battery box 10 has an inner cavity 11 for placing a battery 200. The liquid cooling plate 20 and the detector 30 are both disposed in the inner cavity 11, and the inside of the liquid cooling plate 20 has a coolant. The battery 200 is located on the liquid cooling plate 20, and the detector 30 is used to detect the state of the battery 200.

[0041] The blasting member 40 is disposed on the liquid cooling plate 20 and is electrically connected to the detector 30. The blasting member 40 is used to blast the liquid cooling plate 20 so that the inside of the liquid cooling plate 20 communicates with the inner cavity 11.

[0042] The liquid replenishing mechanism 50 is in communication with the inside of the liquid cooling plate 20 and is electrically connected to the detector 30. The liquid replenishing mechanism 50 includes a circulation state and a liquid replenishing state.

[0043] When the liquid replenishing mechanism 50 is in the circulating state, the coolant circulates between the liquid replenishing mechanism 50 and the interior of the liquid cooling plate 20; when the liquid replenishing mechanism 50 is in the liquid replenishing state, the liquid replenishing mechanism 50 is used to input the coolant into the interior of the liquid cooling plate 20.

[0044] By setting the above-mentioned battery thermal management system, when the battery 200 is normal, the liquid replenishing mechanism 50 is in the circulating state, and the coolant circulates between the liquid cooling plate 20 and the liquid replenishing mechanism 50. The battery 200 is located on the liquid cooling plate 20, and the coolant circulating inside the liquid cooling plate 20 can dissipate heat from the battery 200. When the battery 200 undergoes thermal runaway, the detector 30 detects the state change of the battery 200, and the liquid replenishing mechanism 50 switches from the circulating state to the liquid replenishing state according to the detection information of the detector 30, while the blasting member 40 blasts the liquid cooling plate 20 according to the detection information of the detector 30, so that the interior of the liquid cooling plate 20 communicates with the inner cavity 11. The liquid replenishing mechanism 50 inputs the coolant into the liquid cooling plate 20, and the liquid cooling plate 20 communicates with the inner cavity 11, and the coolant inside the liquid cooling plate 20 will not flow back to the liquid replenishing mechanism 50. Therefore, the coolant will enter the inner cavity 11 and accumulate, and the battery 200 that has undergone thermal runaway will be immersed in the coolant, thereby effectively suppressing the thermal runaway of the battery 200 and improving safety.

[0045] In addition, when the coolant immerses the battery 200 that has undergone thermal runaway, the coolant will also evaporate to generate a large amount of steam when heated, and the steam fills the inner cavity 11, which can maintain a positive pressure and oxygen-deficient environment in the inner cavity 11, further avoiding the combustion of the battery 200.

[0046] It should be noted that the height of the accumulated coolant is related to the input amount of the coolant and the size of the inner cavity 11. Moreover, when the coolant is conductive, it is only necessary to ensure that the coolant does not immerse the top of the battery 200 to cause a short circuit between the positive and negative electrodes of the battery 200; when the coolant is non-conductive and non-flammable, the coolant can completely immerse the battery 200.

[0047] In addition, when the battery 200 undergoes thermal runaway, in addition to the increase in temperature, the voltage of the battery 200 will also change, and at the same time, gas and smoke will be generated. Therefore, the detector 30 can be a composite sensor and is electrically connected to the battery 200 to simultaneously monitor the temperature, voltage, gas, and smoke generated by the battery 200 to avoid misjudgment.

[0048] In some other embodiments, the blasting member 40 can be replaced with a connecting valve. The connecting valve is electrically connected to the detector 30 and is used to connect or disconnect the inner cavity 11 and the interior of the liquid cooling plate 20.

[0049] Thus, when the battery 200 is normal, the connection valve is closed, the interior of the liquid cooling plate 20 is separated from the inner cavity 11, the liquid replenishing mechanism 50 is in a circulating state, and the coolant circulates between the liquid cooling plate 20 and the liquid replenishing mechanism 50. When the battery 200 undergoes thermal runaway, the detector 30 detects the state change of the battery 200, the liquid replenishing mechanism 50 switches from the circulating state to the liquid replenishing state according to the detection information of the detector 30, and the connection valve switches to the open state, so that the interior of the liquid cooling plate 20 communicates with the inner cavity 11. The liquid replenishing mechanism 50 inputs the coolant into the liquid cooling plate 20, and the liquid cooling plate 20 communicates with the inner cavity 11, and the coolant in the liquid cooling plate 20 will not flow back to the liquid replenishing mechanism 50. Therefore, the coolant will enter the inner cavity 11 and accumulate, and the battery 200 that has undergone thermal runaway will be immersed in the coolant, thereby effectively suppressing the thermal runaway of the battery 200 and improving safety.

[0050] It can be understood that by using the connection valve, it is not necessary to damage the liquid cooling plate 20, reducing the usage cost. However, setting the blasting member 40 has a lower preparation cost compared to setting the connection valve, and the blasting member 40 or the connection valve can be set according to actual needs.

[0051] It should be noted that both the blasting member 40 and the connection valve are located on the upper surface of the liquid cooling plate 20. When using the blasting member 40, the upper surface of the liquid cooling plate 20 has a weak area, and the strength of the weak area is weaker than that of other areas on the upper surface. The blasting member 40 is arranged in the weak area, and the battery 200 is located in other areas to ensure that the liquid cooling plate 20 is damaged while preventing the battery 200 from crushing the liquid cooling plate 20.

[0052] In addition, in the following embodiments, the blasting member 40 and the connection valve can be mutually replaced, so they will not be elaborated here.

[0053] In some embodiments, the battery box 10 includes a bottom plate 12 and a box body 13. The box body 13 covers the bottom plate 12 to enclose and form the inner cavity 11, and the liquid cooling plate 20 is arranged on the bottom plate 12.

[0054] It can be understood that the bottom plate 12 mainly plays a supporting and protective role. Figure 1 In the figure, it is for schematically showing the liquid cooling plate 20. In actual use, additional supporting structures can be arranged on the bottom plate 12 to support the battery 200, or installation grooves can be opened on the bottom plate 12, and the liquid cooling plate 20 is placed in the installation grooves. The battery 200 is supported by the bottom plate 12 and contacts the liquid cooling plate 20. Of course, the liquid cooling plate 20 can also support the battery.

[0055] At the same time, it should be noted that the battery 200 is placed on the liquid cooling plate 20, and the liquid cooling plate 20 plays a supporting role for the battery 200. It can be that part of the liquid cooling plate 20 is made of high-strength materials, which plays a supporting and heat exchange role, while other parts contact the battery 200 and play a heat exchange role, that is, dissipating heat from the battery 200.

[0056] In some embodiments, the battery thermal management system further includes a first partition 61 disposed in the inner cavity 11 to divide the inner cavity 11 into a first space and a second space 111. The bottoms of the first space and the second space 111 are not connected to each other, and the liquid cooling plate 20 is located in the first space.

[0057] The battery 200 is located on the liquid cooling plate 20 and also in the first space. The coolant flowing out of the liquid cooling plate 20 enters the first space. Since the bottoms of the first space and the second space 111 are not connected to each other, the coolant will accumulate in the first space and will not enter the second space 111. Thus, compared with the coolant accumulating in the inner cavity 11, the first space is smaller than the inner cavity 11. Therefore, with the same amount of coolant, the height of the accumulated coolant can be increased, improving the suppression effect on the thermal runaway of the battery 200.

[0058] In practical applications, the first partition 61 is connected to the bottom plate 12 and the side walls on the opposite sides of the inner cavity 11, so that the bottoms of the first space and the second space 111 formed by the first partition 61 dividing the inner cavity 11 are not connected to each other, while the tops of the first space and the second space 111 are connected.

[0059] It should be noted that there are other components in the battery thermal management system, and the second space 111 can be used to install other components.

[0060] In some embodiments, the battery thermal management system further includes a second partition 62 disposed in the first space for dividing the first space into a storage space 112 and a third space 113. The bottoms of the storage space 112 and the third space 113 are not connected to each other, and the liquid cooling plate 20 is located in the storage space 112.

[0061] Similarly, it can be understood that by providing the second partition 62, the size of the space where the coolant accumulates can be further reduced, thereby further increasing the height of the accumulated coolant and improving the suppression effect on the thermal runaway of the battery 200.

[0062] In some embodiments, the first partition 61 and the second partition 62 are parallel to each other and are arranged at intervals along the length direction of the battery box 10. The storage space 112 is located between the first partition 61 and the second partition 62. Correspondingly, the second space 111 and the third space 113 are located at both ends of the inner cavity 11 along the length direction of the battery box 10. Both the second space 111 and the third space 113 can be used to install other components or as reserved spaces.

[0063] In addition, it can be determined that both the first partition 61 and the second partition 62 are connected to the bottom plate 12 and the side walls on the opposite sides of the inner cavity 11 in the width direction of the battery box 10, so that the tops of the second space 111, the storage space 112, and the third space 113 are connected in sequence.

[0064] In some embodiments, the battery thermal management system further includes a fire extinguisher and at least two nozzles 70. The fire extinguisher is connected to each nozzle 70 and electrically connected to the detector 30, so as to spray fire extinguishing agent through the nozzle 70 when the detector 30 detects a thermal runaway of the battery 200. The at least two nozzles 70 are arranged in the inner cavity 11 and face the battery 200, so as to spray the fire extinguishing agent onto the battery 200 when the battery 200 has a thermal runaway, and prevent the battery 200 from burning.

[0065] It should be noted that the fire extinguishing agent in the fire extinguisher can be a solid fire extinguishing agent, a liquid fire extinguishing agent or a gas fire extinguishing agent, which is not limited herein. At the same time, the at least two nozzles 70 can also ensure that the sprayed fire extinguishing agent can completely cover all the batteries 200.

[0066] In some embodiments, the battery thermal management system further includes a safety valve 80. The safety valve 80 is arranged on the battery box 10 and is used to open to connect the inner cavity 11 with the outside when the pressure in the inner cavity 11 is greater than a preset pressure value, so as to relieve the pressure of the battery box 10 and prevent an explosion.

[0067] It can be understood that when the battery 200 has a thermal runaway, in addition to the temperature rising, a large amount of gas and smoke may also be generated, resulting in an increase in the pressure in the inner cavity 11. Therefore, the safety valve 80 is provided to relieve the pressure.

[0068] In some embodiments, the liquid replenishing mechanism 50 includes a storage member 51, an inlet pipe 52, an outlet pipe 53, a power member 54 and a control valve 55. The storage member 51 is used to store the coolant. The power member 54 is connected to the storage member 51. The inlet pipe 52 is connected between the power member 54 and the liquid cooling plate 20. The power member 54 is used to transport the coolant in the storage member 51 to the inlet pipe 52. The outlet pipe 53 is connected between the liquid cooling plate 20 and the storage member 51. Both the inlet pipe 52 and the outlet pipe 53 are used to connect the inside of the storage member 51 and the liquid cooling plate 20. The control valve 55 is arranged on the outlet pipe 53.

[0069] When the control valve 55 is opened, the coolant in the liquid cooling plate 20 can flow into the storage member 51 through the outlet pipe 53. At this time, the liquid replenishing mechanism 50 is in a circulating state. When the control valve 55 is closed, the outlet pipe 53 is blocked, and at this time, the liquid replenishing mechanism 50 is in a liquid replenishing state.

[0070] It should be noted that the inlet pipe 52 and the outlet pipe 53 can pass through the bottom plate 12 and be connected to the liquid cooling plate 20.

[0071] In practical applications, the power member 54 is a water pump.

[0072] In some embodiments, the liquid replenishing mechanism 50 further includes a one-way valve 56. The one-way valve 56 is disposed on the liquid inlet pipe 52 and is used to allow the coolant to flow into the interior of the liquid cooling plate 20 through the liquid inlet pipe 52, thereby preventing the coolant that has entered the liquid cooling plate 20 from flowing back.

[0073] It can be understood that since the coolant is pumped to the liquid cooling plate 20 by the power component 54, when the control valve 55 is closed, as long as the power of the power component 54 is sufficient, without the one-way valve 56, the power component 54 can also input the coolant into the liquid cooling plate 20 and ensure that the coolant accumulates to a certain height in the inner cavity 11.

[0074] However, when the battery 200 undergoes thermal runaway, the pressure in the inner cavity 11 will increase. Therefore, the one-way valve 56 is provided to prevent the coolant from flowing back, so as to ensure that the coolant stably accumulates to a certain height in the inner cavity 11.

[0075] In some embodiments, one end of the safety valve 80 is communicated with the second space 111.

[0076] In some embodiments, the battery thermal management system further includes a controller. The controller is electrically connected to the detector 30, the blasting member 40, the control valve 55, and the safety valve 80. When the detector 30 detects that the battery 200 undergoes thermal runaway, the controller controls the control valve 55 to close according to the information detected by the detector 30, and controls the blasting member 40 to blast. The coolant enters the inner cavity 11 and accumulates. When the detector 30 detects that the pressure in the inner cavity 11 is greater than a preset pressure value, the controller controls the safety valve 80 to open, thereby relieving the pressure.

[0077] Of course, the controller can also be electrically connected to the power component 54. After the thermal runaway of the battery 200 is effectively suppressed, the controller can control the power component 54 to turn off.

[0078] It can be understood that after the battery 200 is soaked, it generally needs to be replaced. Therefore, after effectively suppressing the thermal runaway of the battery 200, the controller can control the power component 54 to turn off.

[0079] In addition, when a connection valve is adopted, the controller is electrically connected to the connection valve. After the battery 200 undergoes thermal runaway, the controller controls the connection valve to open.

[0080] To facilitate understanding the effects of the present invention, a specific application scenario is described herein: When the first battery 200 undergoes thermal runaway, the control valve 55 closes, and the power component 54 operates to input the coolant into the liquid cooling plate 20. The height of the accumulated coolant is not less than 30 millimeters, and the third battery 200 does not undergo thermal runaway, effectively suppressing the thermal runaway of the battery 200.

[0081] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0082] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A battery thermal management system, characterized in that, it includes: a battery box having an inner cavity for placing batteries; a liquid cooling plate disposed in the inner cavity, with the battery located on the liquid cooling plate and the inside of the liquid cooling plate having a coolant; a detector disposed in the inner cavity for detecting the state of the battery; and an explosive member disposed on the liquid cooling plate and electrically connected to the detector, the explosive member being used to blast the liquid cooling plate to communicate the inside of the liquid cooling plate with the inner cavity; and a liquid replenishing mechanism communicating with the inside of the liquid cooling plate and electrically connected to the detector, the liquid replenishing mechanism including a circulating state and a liquid replenishing state; a first partition plate disposed in the inner cavity to divide the inner cavity into a first space and a second space, the bottoms of the first space and the second space not communicating with each other, and the liquid cooling plate being located in the first space; a fire extinguisher and at least two nozzles, the fire extinguisher being connected to each nozzle and the fire extinguisher being electrically connected to the detector, at least two nozzles being disposed in the inner cavity and facing the battery; when the liquid replenishing mechanism is in the circulating state, the coolant circulates between the liquid replenishing mechanism and the inside of the liquid cooling plate; when the liquid replenishing mechanism is in the liquid replenishing state, the liquid replenishing mechanism is used to input the coolant into the inside of the liquid cooling plate.

2. The battery thermal management system according to claim 1, characterized in that, the battery thermal management system further includes a second partition plate disposed in the first space for dividing the first space into a storage space and a third space, the bottoms of the storage space and the third space not communicating with each other, and the liquid cooling plate being located in the storage space.

3. The battery thermal management system according to claim 2, characterized in that, the first partition plate and the second partition plate are parallel to each other and are arranged at intervals along the length direction of the battery box, and the storage space is located between the first partition plate and the second partition plate.

4. The battery thermal management system according to claim 1, characterized in that, the battery thermal management system further includes a safety valve disposed on the battery box for opening to communicate the inner cavity with the outside when the pressure in the inner cavity is greater than a preset pressure value.

5. The battery thermal management system according to claim 1, characterized in that, the battery box includes a bottom plate and a box body, the box body covering the bottom plate to enclose and form the inner cavity, and the liquid cooling plate is disposed on the bottom plate.

6. The battery thermal management system according to any one of claims 1 to 5, characterized in that, the liquid replenishing mechanism includes a storage member, an inlet pipe, an outlet pipe, a power member and a control valve, the storage member being used to store the coolant, the power member being connected to the storage member, the inlet pipe being connected between the power member and the liquid cooling plate, the power member being used to transport the coolant in the storage member to the inlet pipe, the outlet pipe being connected between the liquid cooling plate and the storage member, both the inlet pipe and the outlet pipe being used to communicate the storage member with the inside of the liquid cooling plate, and the control valve being disposed on the outlet pipe; When the control valve is opened, the coolant in the liquid cooling plate can flow into the storage member through the liquid outlet pipe; When the control valve is closed, the liquid outlet pipe is blocked.

7. The battery thermal management system according to claim 6, characterized in that, the liquid replenishing mechanism further includes a check valve, and the check valve is arranged on the liquid inlet pipe for allowing the coolant to flow into the interior of the liquid cooling plate through the liquid inlet pipe.

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