WO2018137374A1

WO2018137374A1 - Battery liquid cooling device and battery system

Info

Publication number: WO2018137374A1
Application number: PCT/CN2017/109408
Authority: WO
Inventors: 王永; 林志宏; 徐兴无; 韩宁; 黄文雪
Original assignee: 合肥国轩高科动力能源有限公司
Priority date: 2017-01-26
Filing date: 2017-11-03
Publication date: 2018-08-02

Abstract

The present invention relates to a battery liquid cooling device and a battery system. The battery liquid cooling device comprises a liquid cooling plate. One or more through-holes are arranged at the liquid cooling plate. The one or more through-holes are in communication with a cooling liquid flow channel inside the liquid cooling plate and sealed by a thermo-melt material. The thermo-melt material melts when a battery corresponding to one of the through-holes sealed thereby experiences thermal runaway. The battery liquid cooling device provides a normal cooling function when a battery functions normally, and functions as a fire extinction device when the battery experiences thermal runaway. By arranging the one or more through-holes at the liquid cooling plate and sealing the through-holes with the thermo-melt material, the battery liquid cooling device of the present invention has a very simple structure because no additional components and accompanying weight are added thereto, thereby ensuring no decrease in an energy density of a battery system. The battery liquid cooling device of the present invention can operate autonomously without manual intervention, thereby saving labor, and ensuring safety when a battery is in use.

Description

Battery liquid cooling device and battery system

Technical field

The present invention relates to the field of battery protection technologies, and in particular, to a battery liquid cooling device and a battery system.

Background technique

When the battery system is overcharged, the battery temperature will rise and in severe cases it will catch fire. At present, in order to ensure the safe use of the battery system, the battery management system (BATTERY MANAGEMENT SYSTEM, BMS for short) is generally used for monitoring, which is an active safety protection measure. However, the battery management system also has a certain risk of failure. When the battery management system fails, the safe use of the battery system will not be guaranteed. Since the battery system is connected by a plurality of batteries, when a single battery is out of control, if it cannot be effectively controlled, it is easily affected to other batteries, thereby causing thermal runaway of the entire battery system, and thus it is necessary to add a fire extinguishing device. However, the battery system requires extremely high energy density. If the related components are added, it is necessary to increase the weight of the system, so that the energy density of the battery system is lowered. Therefore, it is necessary to provide a device that can both extinguish fires and ensure the energy density of the battery system.

Summary of the invention

In view of the above drawbacks, the present invention provides a battery liquid cooling device and a battery system, which solves the technical problem that the battery system can ensure the energy density of the battery system while extinguishing the fire.

In a first aspect, the battery liquid cooling device of the present invention comprises a liquid cooling plate, wherein the liquid cooling plate is provided with at least one through hole, and the at least one through hole is connected to a coolant flow channel in the liquid cooling plate. And the at least one through hole is sealed by a hot melt material adapted to melt after the battery corresponding to the sealed through hole is thermally runaway.

In a second aspect, the battery system provided by the present invention includes at least one battery pack, each battery pack includes at least one battery, and the battery system further includes the above battery liquid cooling device, and the liquid cooling plate in the battery liquid cooling device Provided in contact with each battery; the battery system further includes a cooling protection system, The cooling protection system includes a controller, a water pump, and a water-cooled pipeline, wherein: the water-cooled pipeline is connected to an inlet and outlet end of the water pump, an evaporator on a vehicle to which the power battery system belongs, and the water pump, The evaporator and the water-cooling pipeline form a cooling circuit for a water supply circulation flow; the controller is connected to a control end of the water pump, a battery management system of the power battery system, and the controller is used according to the The temperature collected by the battery management system controls the operation of the water pump.

The battery liquid cooling device and the battery system provided by the invention have a low surface temperature of the battery under normal working condition of the battery. At this time, since the through hole is sealed by the hot melt material, the coolant in the liquid cooling plate can be used in the cooling liquid. Normal flow in the flow path, the function of normal cooling of the battery. When the battery is out of control, for example, when a fire occurs, the temperature of the surface of the battery rises, so that the hot melt material in the through hole melts, thereby opening the through hole, and the coolant in the liquid cooling plate is subjected to the pressure difference between the inside and the outside. The through hole is ejected to provide a stronger cooling effect and extinguish the battery flame. It can be seen that, under normal conditions of the battery, the battery liquid cooling device provided by the present invention functions as a normal cooling function, and the battery liquid cooling device provided by the present invention functions as a fire extinguishing device when the battery is thermally out of control. At the same time, since the structure of the present invention is very simple, a through hole is formed in the liquid cooling plate, and the through hole is sealed with a hot melt material, and no new parts are added, so that no weight is increased, thereby ensuring that the energy density of the battery system is not lowered. The battery liquid cooling device provided by the invention completely autonomously operates, and does not need to be considered as intervention, which not only saves manpower, but also ensures safety during battery use.

DRAWINGS

1 is a schematic structural view of an entire battery system in an embodiment of the present invention;

2 is a schematic structural view showing a part of a battery system according to an embodiment of the present invention;

Figure 3 is a front elevational view showing a battery system in accordance with an embodiment of the present invention;

Figure 4 is a partially enlarged schematic view showing the battery liquid cooling device of Figure 3;

Figure 5 shows a rear view of Figure 3;

6 is a schematic diagram showing the connection of a cooling protection system to an evaporator and a battery management system according to an embodiment of the present invention;

Description of the reference signs:

1-liquid cold plate; 11a-through hole; 12a-coolant flow path; 13a-hot melt material; 2-battery;

11b-main inflow passage; 12b-main return passage; 13b-branch passage; 14b-plate of liquid-cooled plate; 15b-ribs; 21b-contact portion; 22b-cut portion;

1c-water-cooled pipeline; 2c-water pump; 21c-water pump control terminal; 22c-power supply; 3c-controller; 4c-evaporator; 5c-battery management system; 6c-flow controller; 61c-flow controller control 7c-three-way solenoid valve; 71c-first inlet and outlet end; 72c-second inlet and outlet end; 73c-third inlet and outlet end; 74c-three-way solenoid valve control end; 8c-external joint switch; - External circulation system.

detailed description

The invention is illustrated below by the preferred embodiment. It should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention.

In the examples, the means used are all conventional means in the art unless otherwise specified.

In a first aspect, an embodiment of the present invention provides a battery liquid cooling device. As shown in FIGS. 1 and 2, the device includes a liquid-cooled plate 1 having at least one through hole 11a formed therein. A through hole 11a is in communication with the coolant flow path 12a in the liquid cooling plate 1, and the at least one through hole 11a is sealed by a hot melt material 13a, and the hot melt material 13a is adapted to be sealed The battery 2 corresponding to the through hole 11a is thermally controlled and melted.

In the battery liquid cooling device provided by the embodiment of the present invention, in the normal working state of the battery 2, the surface temperature of the battery 2 is low. At this time, since the through hole 11a is sealed by the hot melt material 13a, the cooling in the liquid cooling plate 1 can be performed. The liquid normally flows in the coolant flow path 12a, and functions as a normal cooling of the battery 2. When the battery 2 is thermally out of control, for example, when a fire occurs, the temperature of the surface of the battery 2 rises, so that the hot melt material 13a in the through hole 11a is melted, thereby opening the through hole 11a, and the coolant in the liquid cooling plate 1 is inside and outside. Under the action of the pressure difference, it is ejected from the through hole 11a, thereby exerting a stronger cooling effect and extinguishing the battery flame. It can be seen that, under normal conditions of the battery 2, the battery liquid cooling device provided by the present invention functions as a normal cooling function, and the battery liquid cooling device provided by the present invention functions as a fire extinguishing device when the battery 2 is thermally out of control. Meanwhile, since the structure of the present invention is very simple, the through hole 11a is opened in the liquid-cooled plate 1, and the through hole 11a is sealed with the hot melt material 13a, and no new parts are added, so that no weight is added, thereby ensuring energy density of the battery system. No decline. The battery liquid cooling device provided by the invention completely autonomously operates, and does not need to be considered as intervention, which not only saves manpower, but also ensures safety during battery use.

In a specific implementation, in order to make the hot melt material 13a of the sealed through hole 11a more sensitive to the change of the surface temperature of the battery, the through hole 11a may be opened at a position where the liquid cooling plate 1 is in contact with the battery 2. The through hole 11a may be sealed by the hot melt material 13a on the outer surface of the liquid cooling plate 1, and the through hole 11a may be opened at a position where the liquid cooling plate 1 is in contact with the battery 2, and The hot melt material 13a seals the through hole 11a on the outer surface of the liquid cooling plate 1, and of course, other methods or the sensitivity of the hot melt material 13a to sense the surface temperature of the battery may be employed. Further, the through hole 11a may be disposed at a position where the liquid-cooled plate 1 is in contact with each of the batteries, so that when any one of the batteries is thermally runaway, the heat in the through hole 11a in contact with the thermally runaway battery may be melted. The material 13a is melted, thereby opening the through hole 11a in contact with the thermal runaway battery, and the through hole 11a at other positions is not opened, thereby ensuring normal operation of other batteries that are not thermally runaway, thereby effectively improving passive safety protection performance.

In the specific implementation, the size of the through hole 11a may be set according to actual conditions, for example, the diameter is in the range of 0.8 mm to 1 mm, which is not limited in the present invention.

In the specific implementation, the hot-melt material 13a may be a hot-melt metal or an alloy, and the type of the metal or alloy may be selected according to the type of the battery, which is not limited in the invention.

In a specific implementation, if the number of batteries in the battery system is relatively large, a plurality of the above liquid-cooled plates 1 may be disposed to ensure normal use of each battery in the battery system.

As shown in FIGS. 3 to 5, the apparatus may further include a flow path regulating member disposed on the liquid-cooled plate 1, wherein:

The liquid cooling plate 1 includes a plate shell 14b and a coolant flow path disposed inside the plate shell 14b;

The material of the flow path regulating member includes a shape memory material for contacting the battery 2 and adjusting the flow rate of the coolant flow path according to the surface temperature of the contacted battery 2.

It can be understood that since the flow path regulating member is made of a shape memory material, the process of adjusting the flow rate of the coolant flow path according to the temperature is actually a deformation process of the shape memory material, and the deformation of the shape memory material causes cooling. The flow rate of the liquid flow path changes.

For example, when the surface temperature of the battery 2 contacted by the flow path regulating member is relatively low, lower than the deformation temperature of the shape memory material, the deformation of the shape memory material causes the flow rate of the coolant flow path to be small, and the cooling at this time The effect is lower. When the surface temperature of the battery 2 in contact with the flow path regulating member rises above the deformation temperature of the shape memory material, the deformation of the shape memory material causes the flow rate of the coolant flow path to become large, and the cooling effect at this time is improved. When the surface temperature of the battery 2 contacted by the flow path regulating member is lowered to be lower than the deformation temperature of the shape memory material after strong cooling, the shape memory The deformation of the material causes the flow rate of the coolant flow passage to become small, so that the cooling strength is in a relatively low state.

Since the battery liquid cooling device includes a flow path regulating member, the flow regulating member is made of a shape memory material, and a change in temperature causes deformation of the flow path regulating member, thereby causing a change in the flow rate of the cooling liquid flow path, thereby realizing The function of automatic adjustment of cooling intensity. Since the battery liquid cooling device provided by the present invention can automatically adjust the cooling intensity according to the surface temperature of the battery 2 to which the flow path regulating member is in contact with, the shape of the flow path regulating member that is in contact with the different battery 2 is different, so the liquid The cooling device has different cooling capacities for different batteries 2, and can realize differential management of the batteries 2 at different temperatures, thereby controlling the temperature difference of each battery 2 to a small range, improving the use efficiency of the battery 2, and extending the battery. 2 lifetime.

In a specific implementation, the flow channel regulating component can be implemented in various structural forms, which is not limited by the present invention. As shown in Figures 3 to 3, one of the optional structures is:

The flow path regulating member includes a contact portion 21b and a cutout portion 22b, wherein:

The contact portion 21b is disposed outside the plate shell 14b, and is connected to the cutout portion 22b inside the plate shell 14b through the plate shell 14b for contacting the battery 2 outside the board shell 14b;

The cut-off portion 22b is disposed in a coolant flow path inside the plate case 14b for deforming according to a surface temperature of the battery 2 that the connected contact portion 21b contacts to adjust a flow rate of the coolant flow path.

For example, when the surface temperature of the battery 2 that the contact portion 21b contacts is relatively low, lower than the deformation temperature of the shape memory material, the cut-off portion 22b is in a relatively stretched state, so that the cross section of the coolant in the coolant flow path can be circulated. It is relatively small, so the flow rate of the coolant flow channel is relatively small, and the cooling intensity is relatively low. When the surface temperature of the battery 2 that the contact portion 21b contacts is relatively high, higher than the deformation temperature of the shape memory material, the cut-off portion 22b contracts, so that the cross-section of the coolant that can flow through the coolant flow path becomes large, and the flow rate of the coolant flow path It becomes larger and the cooling strength increases. After the strong cooling, the surface temperature of the battery 2 contacted by the contact portion 21b is lowered, and the deformation of the cut-off portion 22b is restored when the deformation temperature of the shape memory material is lower, so that the flow rate of the coolant flow path becomes smaller, so that the cooling strength is obtained. Change back to a lower state.

In the flow path flow regulating member of the above configuration, the contact portion 21b provided outside the plate case 14b is for contacting the battery 2, and the cut-off portion 22b provided in the coolant flow path inside the case is sensed according to the connected contact portion 21b thereof. The temperature is deformed to achieve the adjustment of the flow rate of the coolant flow channel Section. The flow path regulating member of the structure has a simple structure and is easy to implement.

In the specific implementation, the coolant flow path inside the liquid-cooled plate 1 can adopt various structural forms, and the corresponding intercepting portions 22b are arranged differently. As shown in FIGS. 3 to 3, an optional structural form of the coolant flow path is that the coolant flow path includes a main inflow passage 11b, a main return passage 12b, and a main inflow passage 11b and a chamber. A plurality of branch passages 13b of the main return passage 12b are described. For the coolant flow path of such a configuration, the cut-off portion 22b can be disposed in at least one of the branch passages 13b.

In the coolant flow path of the above configuration, the coolant flows in from the main inflow passage 11b, passes through the branch passage 13b, and is taken out from the main return passage 12b. Since the cut-off portion 22b is provided in at least one branch passage 13b, the flow rate of the at least one branch passage 13b can be adjusted.

In the coolant flow path of the above structure, the branch passage 13b can be realized in various structural forms. For example, referring to FIG. 4, the branch passage 13b is disposed in the main intake passage 11b and the main return passage 12b. A plurality of ribs 15b are formed between each other, and of course, other structural forms can also be realized.

In a specific implementation, the shape memory material may be a shape memory alloy or a heat-induced shape memory polymer. Of course, other materials that can be deformed by temperature may be used, and the invention is not limited thereto.

In a specific implementation, the above-mentioned plate shell 14b can be made of various materials. In order to make it have better thermal conductivity, a metal such as copper or an alloy such as an aluminum alloy can be used.

In a second aspect, the present invention further provides a battery system, the system comprising at least one battery pack, each battery pack including at least one battery, the battery system further comprising the above battery liquid cooling device, wherein the battery liquid cooling device The liquid cold plate is placed in contact with each battery.

The battery system further includes a cooling protection system, as shown in FIG. 6, the cooling protection system includes: a controller 3c, a water pump 2c, and a water-cooling line 1c, wherein:

The water-cooling line 1c is connected to both the inlet and outlet end of the water pump 2c and the evaporator 4c on the vehicle to which the power battery system belongs, and the water pump 2c, the evaporator 4c, and the water-cooling line 1c are formed. a cooling circuit for the circulation of the water supply;

The controller 3c is connected to both the control end 21c of the water pump 2c and the battery management system 5c of the power battery system, and the controller 3c is configured to control the temperature according to the temperature collected by the battery management system 5c. The operation of the water pump 2c.

It can be understood that the battery management system 5c, which is a BMS system, is used as an integrated circuit for collecting voltage, current, temperature and other parameters of the battery pack to monitor the status of the battery pack.

In the cooling protection system of the power battery system provided by the embodiment, the water pump 2c provides power for the water circulation in the water-cooled line 1c, and when the water is delivered into the evaporator 4c, the heat is released to the outside of the vehicle by evaporation of the evaporator 4c, and further When water is output from the evaporator 4c, the water temperature is low, so that the battery pack can be cooled by the cooled water. Since the battery management system 5c and the evaporator 4c to which the water-cooling line 1c is connected are all devices on the existing vehicle, only the evaporator 4c on the vehicle is connected to the water-cooling line 1c, and a cooling circuit is formed together with the water pump 2c. The controller 3c is connected to the battery management system 5c on the vehicle, and directly controls the temperature collected by the battery management system 5c. Therefore, in this embodiment, there is no additional vehicle water tank, refrigeration device, etc., compared with the conventional liquid cooling method. Therefore, the additional weight is small, which is beneficial to increase the energy density of the power battery system.

As shown in FIG. 6, the cooling protection system provided in this embodiment may further include a flow controller 6c; the flow controller 6c is connected to any one of the water pump 2c and the evaporator 4c through its inlet and outlet ends. On the side water-cooling line 1c, the flow rate controller 6c, the water pump 2c, the evaporator 4c, and the water-cooling line 1c form a cooling circuit for the water supply circulation flow; the controller 3c and the flow rate control The control terminal 61c of the device 6c is connected, and the controller 3c is further configured to control the flow rate of the flow controller 6c according to the temperature collected by the battery management system 5c.

Here, a flow controller 6c is provided in the above-described cooling circuit, and the flow rate is controlled by the controller 3c. For example, when the surface temperature of the battery pack is high, the temperature drop is too slow during the cooling process by the cooling circuit, so that the surface temperature of the battery pack can be lowered by increasing the flow rate, thereby making the temperature adjustment more flexible. .

As shown in FIG. 6, the cooling protection system may further include two three-way solenoid valves 7c, wherein one of the three-way solenoid valves 7c is connected to the first inlet and outlet end 71c and the second inlet and outlet end 72c of the three-way solenoid valve 7c to On the water-cooling line 1c on one side between the water pump 2c and the evaporator 4c, the other three-way solenoid valve 7c passes through the first inlet and outlet end 71c of the other three-way solenoid valve 7c and the second inlet and outlet water The end 72c is connected to the water-cooling line 1c on the other side between the water pump 2c and the evaporator 4c, and the third inlet and outlet end 73c of the two three-way solenoid valves 7c are in communication; two three-way solenoid valves a first inlet and outlet end 71c of 7c, a second inlet and outlet end 72c of the two three-way solenoid valves 7c, the water pump 2c, the evaporator 4c, and the water cooling The line 1c forms a cooling circuit for the water supply circulation flow; the first inlet and outlet end 71c of the two three-way solenoid valves 7c, the third inlet and outlet end 73c of the two three-way solenoid valves 7c, the water pump 2c, and the water-cooled tube The road 1c forms a heat retention circuit for the water supply circulation flow; the controller 3c is connected to the control ends 74c of the two three-way solenoid valves 7c, and the controller 3c is also used for the temperature collected in the battery management system 5c. When the first preset temperature range is within, the first inlet and outlet end 71c of each three-way solenoid valve 7c is communicated with the third inlet and outlet water end 73c, and the temperature collected in the battery management system 5c is greater than the first When the maximum value of the temperature range is preset, the first inlet and outlet end 71c of each three-way solenoid valve 7c and the second inlet and outlet water end 72c are communicated.

It can be understood that the so-called three-way solenoid valve 7c actually has three inlet and outlet water ends: a first inlet and outlet end 71c, a second inlet and outlet end 72c, and a third inlet and outlet end 73c. Since there is no evaporator 4c in the heat preservation circuit, the water in the pipeline is not cooled, but the battery pack is insulated. When the first inlet and outlet end 71c of each three-way solenoid valve 7c and the second inlet and outlet end are in communication, the cooling circuit is turned on, so that the cooling circuit can be used to cool down at this time. When the first inlet and outlet end 71c of each three-way solenoid valve 7c is in communication with the third inlet and outlet water end, the heat insulation circuit is turned on, so that the heat insulation circuit can be used for heat preservation at this time.

For example, the first preset temperature range is set to a normal operating temperature range of the battery pack, and within the normal operating temperature range, the controller 3c knows that the current battery pack is in a normal working state according to the temperature collected by the battery management system 5c. The first inlet and outlet port 71c and the third inlet and outlet port 73c of the three-way solenoid valve 7c are controlled to communicate with each other through the control end 74c of each three-way battery valve. At this time, the heat insulation circuit is turned on, and then the heat insulation circuit is used to face the battery pack. Keep warm. The so-called heat preservation process is actually when the battery pack temperature is slightly higher than the water temperature in the circuit, the water temperature in the circuit lowers the battery pack temperature. When the battery pack temperature is slightly lower than the water temperature in the circuit, the water temperature in the circuit raises the temperature of the battery pack a little to keep the battery pack temperature within a normal range. At that time, when the battery pack is higher than the maximum value of the normal operating temperature range, that is, when the normal operating temperature range is exceeded, the controller 3c controls the three-way battery valve through the control end 74c of each three-way solenoid valve 7c. The first inlet and outlet end 71c communicates with the second inlet and outlet end 72c. At this time, the cooling water passage is turned on, and the water is cooled by the evaporator 4c in the circuit to further cool the battery pack. It can be seen that the switching of the two circuits can be realized by the three-way solenoid valve 7c, and the adjustment under different temperature conditions can be realized.

Of course, reference may also be made to Embodiment 2, in which a flow controller 6c is added, specifically: The flow controller 6c is connected through its inlet and outlet ends to the water-cooling line 1c between the water pump 2c and any one of the three three-way solenoid valves 7c; the flow controller 6c, two three The first inlet and outlet end 71c of the solenoid valve 7c, the second inlet and outlet end 72c of the two three-way solenoid valves 7c, the water pump 2c, the evaporator 4c, and the water-cooling line 1c form a cooling of the water supply circulation flow. a flow controller 6c, a first inlet and outlet end 71c of the two three-way solenoid valves 7c, a third inlet and outlet end 73c of the two three-way solenoid valves 7c, the water pump 2c, and the water-cooling line 1c Forming a heat preservation circuit for the water supply circulation flow; the controller 3c is connected to the control end 61c of the flow controller 6c, and the controller 3c is further configured to control the flow rate control according to the temperature collected by the battery management system 5c The amount of traffic of the device 6c.

Here, since the flow controller 6c is disposed on the water-cooling line 1c between the water pump 2c and any one of the two three-way solenoid valves 7c, the flow controller 6c participates in both the cooling circuit and the participation. The insulation circuit allows the flow to be controlled not only during the cooling process but also during the holding process.

In the present embodiment, whether or not the flow controller 6c is provided, in order to further adjust the battery temperature, the cooling protection system may further include an external joint switch 8c connected to the water pump 2c and the two tees a water-cooling line 1c between any one of the three-way solenoid valves 7c of the solenoid valve 7c, and the external joint switch 8c is adapted to be connected to an off-board external circulation system 9c; wherein the outer circulation system 9c includes refrigeration a device or a heating device, the outer circulation system 9c further comprising a water tank connected to the refrigeration device or the heating device, and an inlet pipe and an outlet pipe connecting the water tank and the external joint switch 8c; the controller 3c The first inlet and outlet end 71c and the second inlet and outlet end 72c of each three-way solenoid valve 7c are connected to each other when the temperature collected by the battery management system 5c exceeds a preset second preset temperature range. And opening the external joint switch 8c; wherein, the maximum value of the first preset temperature range is smaller than the maximum value of the second preset temperature range, and the minimum of the first preset temperature range Greater than the second predetermined minimum temperature range.

It can be understood that the maximum value of the first preset temperature range is smaller than the maximum value of the second preset temperature range, and the minimum value of the first preset temperature range is greater than the second preset temperature range. The minimum value means that the first preset temperature range falls within the second temperature range.

It can be understood that since the outer circulation system 9c includes a refrigerating device or a heating device, the outer The circulation system 9c further includes a water tank connected to the refrigeration device or the heating device, and an inlet pipe and an outlet pipe connecting the water tank and the external joint switch 8c, so the water pump 2c, the external joint switch 8c, the water inlet pipe of the water tank, The water tank, the refrigeration unit or the heating unit, the water outlet pipe of the water tank, and the water-cooling line 1c form an external heat management circuit. When the temperature exceeds the preset second preset temperature range, the controller 3c controls the external joint switch 8c to open, and the first inlet and outlet end 71c of each three-way solenoid valve 7c communicates with the second inlet and outlet end 72c, using the outside The refrigeration unit or the heating unit in the circulation system 9c cools or heats the battery pack.

For example, when the temperature is higher than the maximum value of the second preset range, the vehicle is stopped, the external joint switch 8c is artificially connected to the outer circulation system 9c, and then the refrigeration unit in the outer circulation system 9c is used to cool the battery pack. Alternatively, when the temperature is lower than the minimum value of the second predetermined range, the vehicle is stopped, the external joint switch 8c is artificially connected to the outer circulation system 9c, and then the heating device in the outer circulation system 9c is used to heat the battery pack.

Since the external circulation system 9c is a non-vehicle device, it can be installed at a certain station, so that the additional weight of the battery system is not increased, and the energy density of the battery system is not lowered.

In the above process, there is also a case where when the temperature of the battery pack is less than the minimum value of the first preset temperature range and greater than or equal to the minimum value of the second preset temperature range, at this time, The temperature of the battery pack is lower than the normal operating temperature range, but it is greater than or equal to the minimum value of the second dangerous temperature range. In this case, the heat generated by the battery pack itself can be used to increase the surface temperature. The water pump 2c can be controlled to stop. It should be understood that when the water pump 2c is stopped, no matter which circuit is inoperative, it does not work.

As in the first embodiment, the present embodiment does not have an additional device such as a vehicle tank or a refrigerating device with respect to the conventional liquid cooling method. Therefore, the additional weight is small, which is advantageous for improving the energy density of the power battery system.

As shown in FIG. 6, the cooling protection system may further include a power source 22c connected between the control terminal 21c of the water pump 2c and the controller 3c. In the present embodiment, the power supply 22c is used to supply power to the controller 3c and the water pump 2c to ensure normal operation of the controller 3c and the power source 22c.

The present invention also provides an electric vehicle including an evaporator 4c and a power battery system.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Variations and modifications are intended to fall within the scope of the invention as defined by the appended claims.

Industrial applicability

The present invention provides a battery liquid cooling device and a battery system. The battery liquid cooling device includes a liquid cooling plate, and the liquid cooling plate is provided with at least one through hole, and the at least one through hole and the liquid cooling plate are cooled. The liquid flow path is in communication and the at least one through hole is sealed by a hot melt material adapted to melt after thermal de-control of the battery corresponding to the sealed through hole. Under normal conditions of the battery, the battery liquid cooling device functions as a normal cooling function, and when the battery is out of control, the battery liquid cooling device functions as a fire extinguishing device. At the same time, since the structure of the present invention is very simple, a through hole is formed in the liquid cooling plate, and the through hole is sealed with a hot melt material, and no new parts are added, so that no weight is increased, thereby ensuring that the energy density of the battery system is not lowered. The battery liquid cooling device provided by the invention completely autonomously operates, does not need to be considered as intervention, saves manpower, and can ensure the safety in the process of using the battery, and has excellent industrial application prospect.

Claims

A battery liquid cooling device, comprising: a liquid cooling plate, wherein the liquid cooling plate is provided with at least one through hole, and the at least one through hole communicates with a coolant flow channel in the liquid cooling plate, and The at least one through hole is sealed by a hot melt material adapted to melt after thermal de-control of the battery corresponding to the sealed through hole.
A battery liquid cooling apparatus according to claim 1, wherein said at least one through hole is sealed by said hot melt material on an outer surface of said liquid cooling plate.
A battery liquid cooling apparatus according to claim 1, further comprising a flow path regulating member provided on said liquid cooling plate, wherein:

The liquid cooling plate comprises a plate shell and a coolant flow channel disposed inside the plate shell;

The material for the flow path regulating member includes a shape memory material for contacting the battery and adjusting the flow rate of the coolant flow path according to the surface temperature of the contacted battery.
A battery liquid cooling apparatus according to claim 3, wherein said flow path regulating member comprises a contact portion and a shutoff portion, wherein:

The contact portion is disposed outside the plate shell, and is connected to the intercepting portion inside the plate shell through the plate shell for contacting the battery outside the plate shell;

The intercepting portion is disposed in a coolant flow channel inside the plate shell for deforming according to a surface temperature of a battery contacted by the connected contact portion to adjust a flow rate of the coolant flow channel.
A battery liquid cooling apparatus according to claim 4, wherein said coolant flow path comprises a main inflow passage, a main return passage, and a plurality of branches communicating said main inflow passage and said main return passage a passage, the intercepting portion being disposed in at least one branch passage.
A battery liquid cooling apparatus according to claim 5, wherein said branch passage is formed by a plurality of ribs disposed between said main inflow passage and said main return passage.
A battery system comprising at least one battery pack, each battery pack comprising at least one battery, wherein the battery system further comprises the battery liquid cooling device according to any one of claims 1 to 6, the battery liquid The liquid cooling plate in the cold device is disposed in contact with each of the batteries; the battery system further includes a cooling protection system including a controller, a water pump, and a water-cooled pipeline, wherein:

The water-cooling pipeline and the water inlet and outlet end of the water pump, and the vehicle of the power battery system The evaporators are all connected, and the water pump, the evaporator and the water-cooled pipeline form a cooling circuit for the water supply circulation flow;

The controller is connected to a control end of the water pump, a battery management system of the power battery system, and the controller is configured to control operation of the water pump according to a temperature collected by the battery management system.
The battery system according to claim 7, further comprising a flow controller; said flow controller being connected to a water-cooling line on either side between said water pump and said evaporator through an inlet and outlet end thereof The flow controller, the water pump, the evaporator, and the water-cooled pipeline form a cooling circuit for a water supply circulation flow; the controller is connected to a control end of the flow controller, and the controller is further used Controlling the flow rate of the flow controller according to the temperature collected by the battery management system.
The battery system according to claim 7, further comprising two three-way solenoid valves, wherein a three-way solenoid valve is connected to the first inlet and outlet ends and the second inlet and outlet ends of the three-way solenoid valve On the water-cooling line on one side between the water pump and the evaporator, another three-way solenoid valve is connected to the water pump and the water through the first inlet and outlet ends and the second inlet and outlet end of the other three-way solenoid valve The water-cooling line on the other side between the evaporators, and the third inlet and outlet ends of the two three-way solenoid valves are connected; the first inlet and outlet ends of the two three-way solenoid valves, and the two three-way solenoid valves a second inlet and outlet, the water pump, the evaporator and the water-cooling pipeline form a cooling circuit for the water supply circulation flow; the first inlet and outlet ends of the two three-way solenoid valves, and the third inlet and outlet of the two three-way solenoid valves The water end, the water pump and the water-cooled pipeline form a heat preservation circuit for the water supply circulation flow;

The controller is connected to the control ends of the two three-way solenoid valves, and the controller is further configured to make each of the three links when the temperature collected by the battery management system is within a first preset temperature range The first inlet and outlet end of the solenoid valve is in communication with the third inlet and outlet end, and the first of each three-way solenoid valve is made when the temperature collected by the battery management system is greater than the maximum value of the first preset temperature range The inlet and outlet ends are in communication with the second inlet and outlet ends.
The battery system according to claim 9, further comprising a flow controller connected to the water pump and any one of the three three-way solenoid valves through the inlet and outlet ends thereof On the water-cooled pipeline; the flow controller, the first of the two three-way solenoid valves a water inlet end, a second inlet and outlet end of the two three-way solenoid valves, the water pump, the evaporator and the water-cooling line form a cooling circuit for the water supply circulation flow; the flow controller, two three-way electromagnetic a first inlet and outlet end of the valve, a third inlet and outlet end of the two three-way solenoid valves, the water pump and the water-cooled pipeline form a heat retention loop for the water supply circulation flow; the controller and the flow controller are controlled The controller is further configured to control a flow rate of the flow controller according to a temperature collected by the battery management system.
The battery system according to claim 9 or 10, further comprising an external joint switch connected to water cooling between the water pump and any one of the three three-way solenoid valves And the external joint switch is adapted to be connected to an off-board external circulation system connection; wherein the external circulation system comprises a refrigeration device or a heating device, the external circulation system further comprising the refrigeration device or the a water tank connected to the heating device and an inlet pipe and an outlet pipe connecting the water tank and the external joint switch;

The controller is further configured to connect the first inlet and outlet end of each three-way solenoid valve with the second inlet and outlet water end when the temperature collected by the battery management system exceeds a preset second preset temperature range, And opening the external joint switch;

The maximum value of the first preset temperature range is smaller than the maximum value of the second preset temperature range, and the minimum value of the first preset temperature range is greater than the minimum value of the second preset temperature range. .
The battery system according to claim 11, wherein the controller is further configured to: the temperature collected in the battery management system is less than a minimum value of the first preset temperature range and greater than or equal to the first When the minimum value of the preset temperature range is two, the water pump is stopped.