WO2023230863A1

WO2023230863A1 - Control method of thermal management system, and thermal management system

Info

Publication number: WO2023230863A1
Application number: PCT/CN2022/096309
Authority: WO
Inventors: 阙仕标; 陈灿; 陈德威
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2023-12-07
Also published as: CN117501515A

Abstract

Disclosed in the present application is a control method of a thermal management system. The thermal management system is used for adjusting temperature of a battery in a power station; the thermal management system comprises a fluid circulation loop, the fluid circulation loop containing a fluid; and the fluid circulation loop is connected to a thermal management component of the battery or at least a part of loop of the fluid circulation loop is arranged around the battery, and is used for exchanging heat with the battery. The method comprises: acquiring a first temperature and a second temperature, the first temperature being the temperature of the fluid at a first position in the fluid circulation loop, the second temperature being the temperature of the fluid at a second position in the fluid circulation loop, the fluid flowing in a direction away from the battery at the first position, and the fluid flowing in a direction close to the battery at the second position; and heating or cooling the fluid according to the first temperature and the second temperature. The control method in the present application can adjust the temperature of a battery in a power station, thus effectively improving the performance of the battery in the power station, and helping to improve safety of the battery in the power station.

Description

Control method and thermal management system of thermal management system

Technical field

The present application relates to the field of thermal management, and more specifically, to a control method of a thermal management system and a thermal management system.

Background technique

Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmentally friendly advantages. As the main energy storage component in electric vehicles, batteries directly affect the performance of electric vehicles.

Temperature is one of the factors that has an important impact on the service life and cycle performance of the battery. Too low a temperature may cause the battery's charging and discharging efficiency to decrease, significantly reducing the overall performance of the electric vehicle; too high a temperature may cause the battery's charging and discharging capacity to decrease, causing serious safety issues in severe cases. Therefore, batteries in vehicles are generally equipped with thermal management components to manage and regulate the temperature of the battery. However, existing thermal management methods are all designed for batteries in vehicles. For some cases where the battery is not in the vehicle, the thermal management components of the battery itself cannot work independently (such as batteries in power stations). In this case, the battery in the vehicle is Thermal management methods are no longer effective in thermally managing batteries. Therefore, how to effectively manage the thermal management of batteries under this special situation has become an urgent problem to be solved.

Application content

Embodiments of the present application provide a control method and thermal management system for a thermal management system, which can effectively manage the heat of batteries in a power station and help improve the performance and safety of batteries in the power station.

In a first aspect, a method for controlling a thermal management system is provided. The thermal management system is used to adjust the temperature of batteries in a power station. The thermal management system includes a fluid circulation loop, a fluid in the fluid circulation loop, and the fluid The circulation loop is connected to the thermal management component of the battery or at least part of the fluid circulation loop is arranged around the battery for heat exchange with the battery; the method includes: obtaining the first temperature and the second temperature. Two temperatures, the first temperature is the temperature of the fluid at a first position in the fluid circulation loop, the second temperature is the temperature of the fluid at a second position in the fluid circulation loop, and the In the first position, the fluid flows in a direction away from the battery, and in the second position, the fluid flows in a direction close to the battery; the fluid is processed according to the first temperature and the second temperature. Heating or cooling.

In the embodiments of the present application, since the fluid circulation loop of the thermal management system is connected to the thermal management component of the battery or is partially arranged around the battery, it can be directly connected to the thermal management component of the battery to perform fluid exchange and thereby control the temperature of the battery. Or it can be placed around the battery to control the temperature of the battery by controlling the ambient temperature around the battery. The temperature of the fluid at the first position can reflect the temperature of the battery in the power station, and the temperature of the fluid at the second position is the temperature of the fluid after heating or cooling. The control method of this application obtains the temperature of the first position and the second position and calculates the temperature according to the temperature of the first position and the second position. The first temperature and the second temperature are determined to heat or cool the fluid, thereby regulating the temperature of the battery in the power station, effectively improving the safety of the battery in the power station due to the inability of its own thermal management components to work independently, affecting the performance of the battery or causing thermal runaway. The situation of the problem helps improve the performance and safety of the battery in different application scenarios.

In some embodiments, heating or cooling the fluid according to the first temperature and the second temperature includes: when the first temperature is less than a first threshold, heating the fluid to The second temperature is raised.

In some embodiments, heating or cooling the fluid according to the first temperature and the second temperature includes: when the first temperature is greater than a second threshold, cooling the fluid to Lower the second temperature.

In the embodiments of the present application, when the first temperature is less than the first threshold and greater than the second threshold, heating or cooling the fluid to control the second temperature of the fluid can accurately control the second temperature of the fluid to be greater than or equal to The second threshold value is smaller than the first threshold value, thereby controlling the battery temperature to be stable within a certain range. This range may be a temperature range in which the battery can maintain efficient cycle performance and ensure safety. Therefore, the thermal management system can effectively control the power station. Thermal management of the battery in the battery.

In some embodiments, heating the fluid to increase the second temperature includes heating the fluid to increase the second temperature to a first preset temperature, the first preset temperature being Assume that the temperature is greater than or equal to the first threshold and less than or equal to the second threshold.

In the embodiment of the present application, the fluid is directly heated to the first preset temperature, that is, the temperature of the fluid is directly heated to a preset value, and the preset value is within the temperature range formed by the second threshold and the first threshold. , thereby being able to control the fluid temperature within the required temperature range, thereby achieving effective control of the battery temperature.

In some embodiments, heating the fluid to increase the second temperature includes heating the fluid to increase the second temperature to a second preset temperature, the second preset temperature being Assume that the temperature is the first preset temperature plus a first preset value, wherein the first preset value is based on the ambient temperature, the distance between the second position and the battery, the distance between the second position and the At least one of the lengths of the fluid circulation loop is provided between cells.

In the embodiment of the present application, considering the influence of environmental temperature, the distance between the second position and the battery, the length of the fluid circulation loop and other factors on the temperature, a method is adopted to increase the fluid temperature to the second preset temperature. The second preset temperature is higher than the first preset temperature and may not fall within the temperature range formed by the second threshold and the first threshold, but the second preset temperature can effectively compensate for the fluid's transition from passing through the second threshold under the influence of the above factors. Heat loss from the location to the thermal management components of the battery or on its path to the surroundings of the battery. As a result, the thermal management system can more accurately control the temperature of the battery and improve the performance of the thermal management system.

In some embodiments, cooling the fluid to reduce the second temperature includes cooling the fluid to reduce the second temperature to a first preset temperature.

In some embodiments, cooling the fluid to reduce the second temperature includes: cooling the fluid to reduce the second temperature to a third preset temperature, the third preset temperature is the first preset temperature minus a second preset value, wherein the second preset value is based on the ambient temperature, the distance between the second position and the battery, and the distance between the second position and the battery. At least one of the lengths of the fluid circulation loop is set.

In the embodiment of the present application, the method of cooling the fluid is similar to the method of heating the fluid. The second temperature can be directly lowered to the first preset temperature, that is, the temperature of the fluid can be directly lowered to a required temperature range, or the second temperature can be directly lowered to the first preset temperature. The second temperature is lowered to the third preset temperature. The third preset temperature is lower than the first preset temperature and may not fall within the temperature range formed by the second threshold and the first threshold. However, the third preset temperature can effectively compensate for the fluid Under the influence of the above factors, the temperature rise caused by the heat absorbed on the path from passing through the second position to entering the thermal management component of the battery or reaching the vicinity of the battery can control the temperature of the battery more accurately and improve the performance of the battery. and security.

In some embodiments, the method further includes: obtaining a first pressure, the first pressure being the pressure of the fluid at the second position; and controlling the flow rate of the fluid circulation loop according to the first pressure.

In some embodiments, controlling the flow rate of the fluid circulation circuit according to the first pressure includes: when the first pressure is less than a third threshold, controlling the flow rate to increase until the first pressure Greater than or equal to the third threshold; or in the case where the first pressure is greater than the fourth threshold, the flow rate is controlled to decrease until the first pressure is less than or equal to the fourth threshold.

In the embodiments of the present application, considering that the pressure of the fluid in the fluid circulation loop has a great impact on the heat exchange performance between the fluid and the battery and on the safety performance of the circulation loop, the first pressure is obtained and adjusted according to the first pressure The flow rate of the fluid in the fluid circulation loop can effectively control the pressure of the fluid circulation loop, improve the situation where the heat exchange performance of the fluid circulation loop is degraded due to excessive pressure or too small pressure, and avoid damage to the circulation loop caused by the fluid when the pressure is too high, ensuring The heat exchange performance between the fluid and the battery improves the performance and safety of the battery and helps improve the safety performance of the thermal management system.

In some embodiments, the fluid is selected from at least one of water, purified water, saline solution, and liquid nitrogen.

In some embodiments, the power station is a power swap station.

In some embodiments, the power station is an energy storage power station.

In a second aspect, a thermal management system is provided. The thermal management system is used to regulate the temperature of batteries in a power station. The thermal management system includes: a fluid circulation loop, the fluid circulation loop has fluid, and the fluid circulation loop Connected to the thermal management component of the battery or at least part of the fluid circulation loop is provided around the battery for heat exchange with the battery; a control unit configured to obtain the first temperature and a second temperature, where the first temperature is the temperature of the fluid at a first location in the fluid circulation loop, the second temperature is the temperature of the fluid at a second location in the fluid circulation loop, where In the first position, the fluid flows in a direction away from the battery, and in the second position, the fluid flows in a direction close to the battery; the fluid is changed according to the first temperature and the second temperature. Fluids are heated or cooled.

In some embodiments, the control unit is configured to heat the fluid to increase the second temperature when the first temperature is less than a first threshold.

In some embodiments, the control unit is configured to cool the fluid to reduce the second temperature when the first temperature is greater than a second threshold.

In some embodiments, the control unit is used to heat the fluid to increase the second temperature to a first preset temperature, the first preset temperature being greater than or equal to the first threshold and less than or equal to the second threshold.

In some embodiments, the control unit is used to heat the fluid to increase the second temperature to a second preset temperature, the second preset temperature being the first preset temperature plus a third A preset value; wherein the first preset value is based on the ambient temperature, the distance between the second position and the battery, and the length of the fluid circulation loop between the second position and the battery. At least one setting.

In some embodiments, the control unit is configured to cool the fluid to reduce the second temperature to the first preset temperature.

In some embodiments, the control unit is used to refrigerate the fluid to reduce the second temperature to a third preset temperature, where the third preset temperature is the first preset temperature minus a second A preset value, the second preset value is based on at least one of the ambient temperature, the distance between the second location and the battery, and the length of the fluid circulation loop between the second location and the battery. set up.

In some embodiments, the control unit is further configured to obtain a first pressure, which is the pressure of the fluid at the second position; and control the flow of the fluid circulation loop according to the first pressure. .

In some embodiments, the control unit is configured to control the flow rate to increase until the first pressure is greater than or equal to the third threshold when the first pressure is less than a third threshold; or when the first pressure is less than a third threshold; When the first pressure is greater than the fourth threshold, the flow rate is controlled to decrease until the first pressure is less than or equal to the fourth threshold.

In some embodiments, the power station is a power swap station.

In some embodiments, the power station is an energy storage power station.

In a third aspect, a thermal management device is provided. The thermal management device includes: a processor and a memory; wherein the memory stores computer program instructions, the processor is used to execute the computer program instructions, and the processing When the computer program instructions are executed by the computer, the control method of the thermal management system in any embodiment of the first aspect is implemented.

In a fourth aspect, a computer storage medium is provided. Computer execution instructions are stored in the computer storage medium. When the computer execution instructions are executed by a processor, they are used to implement the thermal management system as in any embodiment of the first aspect. Control Method.

A fifth aspect provides a power swap station, which includes a thermal management system as in any embodiment of the second aspect.

A sixth aspect provides an energy storage power station, which includes the thermal management system in any embodiment of the second aspect.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an electrical device of the present application;

Figure 2 is a schematic structural diagram of a battery of the present application;

Figure 3 is a schematic flow chart of a control method of a thermal management system of the present application;

Figure 4 is another schematic flow chart of a control method of a thermal management system of the present application;

Figure 5 is a schematic structural diagram of a thermal management system of the present application;

Figure 6 is a schematic structural diagram of a thermal management device of the present application;

Figure 7 is a schematic structural diagram of a power swap station of the present application;

Figure 8 is a schematic structural diagram of an energy storage power station of the present application.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise stated, "plurality" means more than two; the terms "upper", "lower", "left", "right", "inside", " The orientation or positional relationship indicated such as "outside" is only for the convenience of describing the present application and simplifying the description. It 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 of the present application. Application restrictions. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable error range. "Parallel" is not parallel in the strict sense, but within the allowable error range.

The directional words appearing in the following description are the directions shown in the figures and do not limit the specific structure of the present application. In the description of this application, it should also be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application may be understood based on specific circumstances.

The term "and/or" in this application is just an association relationship describing associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists, A and B exist simultaneously, and B exists these three situations. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the technical field of this application; the terms used in the specification of this application are only for describing specific implementations. The purpose of the examples is not intended to limit the application; the terms "including" and "having" and any variations thereof in the description and claims of the application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or priority relationship.

Reference in this application to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

"Multiple" appearing in this application refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple tablets" refers to two or more tablets. (including two pieces), multiple columns refers to more than two columns (including two columns).

In the automotive industry environment that uses traditional energy as power supply, environmental pollution problems are becoming more and more serious. Actively developing new energy vehicles can reduce the harm to the environment. For new energy vehicles, battery technology is an important factor related to their development.

Currently, thermal management of batteries is usually achieved by equipping batteries with thermal management components. For example, fans and air ducts are set up around the battery, or water-cooling plates are set up, and the thermal management of the battery is achieved by connecting to the vehicle's mobile components or water supply components. However, in some situations where the battery is not placed in the vehicle (for example, the battery in the power station), the thermal management components of the battery itself cannot work, and the battery cannot be effectively thermally managed.

In view of this, this application provides a thermal management system control method and thermal management system, which can effectively manage the thermal management of batteries in power stations, help improve the performance and safety of batteries in power stations, and further expand the application range of batteries.

As shown in Figure 1, it is a schematic structural diagram of a vehicle 1 in this application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. A motor 11 , a controller 12 and a battery 10 may be installed inside the vehicle 1 . The controller 12 is used to control the battery 10 to provide power to the motor 11 . For example, the battery 10 may be disposed at the bottom, front or rear of the vehicle 1 . The battery 10 can be used to supply power to the vehicle 1 . For example, the battery 10 can be used as an operating power source of the vehicle 1 and used in the circuit system of the vehicle 1 , for example, to meet the power requirements for starting, navigation, and operation of the vehicle 1 . In another embodiment of the present application, the battery 10 can not only be used as an operating power source of the vehicle 1 , but also can be used as a driving power source of the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

It should be understood that this application takes a vehicle as an example as an electrical device, but the electrical device can also be a mobile phone, a portable device, a laptop, a ship, a spacecraft, an electric toy, an electric tool, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include aircraft, rockets, space shuttles, spaceships, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more. The embodiments of this application impose no special restrictions on the above electrical equipment.

In this application, a battery refers to a physical module that includes one or more battery cells to provide electrical energy. For example, the battery mentioned in this application may include a battery module or a battery pack. Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in mixed connection. Hybrid connection refers to a mixture of series and parallel connection. Batteries may also be called battery packs. Optionally, multiple battery cells can be first connected in series, parallel, or mixed to form a battery module, and then multiple battery modules can be connected in series, parallel, or mixed to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery module, and then the battery module can form a battery.

For example, as shown in FIG. 2 , it is a schematic structural diagram of a battery 10 of the present application. The battery 10 may include a plurality of battery cells 20 . The number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power.

Optionally, the battery cell 20 may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which are not limited in the embodiments of the present application. In some embodiments, the battery cell 20 may also be called a cell.

The battery cell 20 includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector that is not coated with the positive electrode active material layer protrudes from the current collector that is coated with the positive electrode active material layer. The current collector coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector that is not coated with the negative electrode active material layer protrudes from the current collector that is coated with the negative electrode active material layer. The current collector coated with the negative active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (Polyethylene, PE). In addition, the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.

Optionally, the battery 10 further includes a box, a battery management system and related installation structural components. Among them, the battery management system includes thermal management components.

Next, the control method 300 of the thermal management system according to the embodiment of the present application will be introduced.

The control method 300 of the thermal management system is used to regulate the temperature of the battery 10 in the power station. The thermal management system includes a fluid circulation loop with fluid in the fluid circulation loop. The fluid circulation loop is connected to the thermal management component of the battery 10 or at least part of the fluid circulation loop. The circuit is provided around the battery 10 for heat exchange with the battery 10 .

Figure 3 is a schematic flow chart of a control method 300 for a thermal management system according to an embodiment of the present application. The method 300 includes:

S301, obtain the first temperature T1 and the second temperature T2.

S302, heat or cool the fluid according to the first temperature T1 and the second temperature T2.

Wherein, the first temperature T1 is the temperature of the fluid at a first position in the fluid circulation circuit, and the second temperature T2 is the temperature of the fluid at a second position in the fluid circulation circuit. At the first position, the fluid flows in a direction away from the battery 10. In the second position, the fluid flows in a direction close to the battery 10 .

Specifically, the fluid exchanges heat with the battery 10 in the thermal management component of the battery 10 or in at least part of a fluid circulation loop disposed around the battery 10 . In the case where the fluid circulation circuit is directly connected to the thermal management component of the battery 10 , the fluid circulation circuit and the thermal management component together form a fluid circulation circuit, and the fluid flows from the fluid circulation circuit of the thermal management system to the thermal management component of the battery 10 in the circulation circuit. Then it flows back to the fluid circulation loop of the thermal management system. When at least part of the fluid circulation loop is arranged around the battery 10 , the fluid circulation loop itself is a circulation loop for the fluid, and the fluid flows from a position in the circulation loop far away from the battery 10 to at least part of the loop arranged around the battery 10 and then flows again. Return to a position away from the battery 10. At the first position, the fluid flows in a direction away from the battery 10 . In other words, the fluid at the first position is the fluid after heat exchange with the battery 10 . Therefore, the first temperature T1 can reflect the current temperature of the battery 10 . At the second position, the fluid flows in a direction close to the battery 10 . In other words, the fluid at the second position is a fluid that is about to exchange heat with the battery 10 after being heated or cooled. Therefore, the second temperature T2 can reflect the temperature after heating or cooling. whether the fluid has reached the desired temperature. Heating or cooling the fluid is determined by the first temperature T1 and the second temperature T2, and the temperature of the fluid can be flexibly adjusted according to the current temperature of the battery 10, so that the battery 10 reaches the desired temperature after heat exchange with the fluid.

In this embodiment, by obtaining the temperature of the first position and the second position and determining whether to heat or cool the fluid according to the first temperature T1 and the second temperature T2, the temperature of the battery 10 in the power station can be adjusted, effectively improving the efficiency of the power station. The battery 10's thermal management components cannot work independently, which affects the performance of the battery 10 or thermal runaway causes safety issues, which helps improve the performance and safety of the battery in different application scenarios.

Optionally, in S302, heating or cooling the fluid according to the first temperature T1 and the second temperature T2 includes:

When the first temperature T1 is less than the first threshold, heating the fluid to increase the second temperature; or

In the case where the first temperature T1 is greater than the second threshold, the fluid is cooled to reduce the second temperature.

Specifically, the second threshold is greater than the first threshold, and the temperature range from the first threshold to the second threshold is a temperature range suitable for the performance and safety of the battery 10 . When the first temperature T1 is less than the first threshold, it means that the temperature of the battery 10 is too low and needs to be heated up; when the first temperature T1 is greater than the second threshold, it means that the temperature of the battery 10 is too high and needs to be cooled down. When the first temperature T1 does not fall within the range of the first threshold to the second threshold, heating or cooling the fluid in the fluid circulation loop can control the temperature of the battery in time through heat exchange between the fluid and the battery 10 .

For example, the first threshold is greater than or equal to 10°C and less than or equal to 20°C; the second threshold is greater than or equal to 45°C and less than or equal to 55°C.

In this embodiment, the fluid in the heating or cooling fluid circulation loop is determined based on whether the first temperature T1 falls within the temperature range from the first threshold to the second threshold, so as to accurately adjust the temperature of the battery 10 and improve the battery life in the power station. 10 performance and security.

Optionally, heating the fluid to increase the second temperature T2 includes:

Heating the fluid to increase the second temperature T2 to a second preset temperature; or

The fluid is heated to increase the second temperature T2 to a third preset temperature.

Wherein, the first preset temperature is greater than or equal to the first threshold and less than or equal to the second threshold, the second preset temperature is the first preset temperature plus the first preset value, and the first preset value is based on the ambient temperature and the second preset value. At least one of the distance between the position and the battery 10 and the length of the fluid circulation loop between the second position and the battery 10 is set.

Specifically, when heating the fluid, the fluid can be directly heated to the second preset temperature, that is, the temperature of the fluid can be directly heated to a temperature range from the first threshold to the second threshold, so that the second temperature T2 falls within the first threshold to the second threshold temperature range.

In addition, factors such as ambient temperature, the distance between the second location and the battery 10 , and the length of the fluid circulation loop between the second location and the battery 10 all have an impact on the fluid temperature. For example, if the ambient temperature is too low, the distance between the second location and the battery 10 is far, or the length of the fluid circulation loop between the second location and the battery 10 is too long, the fluid will flow to the thermal management of the battery 10 after passing through the second location. The fluid surrounding the component or battery 10 undergoes heat loss as it circulates through the circuit, such that the actual temperature of the fluid ultimately exchanging heat with the battery 10 is lower than the second temperature T2. At this time, when heating the fluid, the fluid may be heated to a second preset temperature, which is higher than the first preset temperature and may not fall within the temperature range from the first threshold to the second threshold, as This second preset temperature can compensate for the heat loss caused by the above factors, so that the temperature of the fluid that exchanges heat with the battery 10 is within the temperature range from the first threshold to the second threshold.

In this embodiment, by designing different heating methods for the fluid, the power station in actual production and life can flexibly choose different heating methods to heat the fluid according to its own facilities, helping to improve the overall performance of the thermal management system.

Optionally, cooling the fluid to reduce the second temperature T2 includes:

Cool the fluid to reduce the second temperature T2 to the first preset temperature; or

The fluid is cooled to reduce the second temperature T2 to a third preset temperature.

The third preset temperature is the first preset temperature minus the second preset value. The second preset value is based on the ambient temperature, the distance between the second position and the battery 10 , and the fluid circulation circuit between the second position and the battery 10 . At least one setting in length.

Specifically, similar to the way of heating the fluid, when cooling the fluid, the fluid can be directly cooled to the first preset temperature, that is, to a temperature range from the first threshold to the second threshold, so that the second temperature T2 falls. Within the temperature range from the first threshold to the second threshold.

In addition, factors such as ambient temperature, the distance between the second location and the battery 10 , and the length of the fluid circulation loop between the second location and the battery 10 all have an impact on the fluid temperature. For example, if the ambient temperature is too high, the distance between the second location and the battery is far, or the length of the fluid circulation loop between the second location and the battery 10 is too long, the fluid will flow to the thermal management component of the battery 10 after passing through the second location. Or the fluid around the battery 10 absorbs additional heat from the environment during the circulation loop, so that the actual temperature of the fluid that ultimately performs heat exchange with the battery 10 is higher than the second temperature T2. At this time, when cooling the fluid, the fluid can be cooled to a third preset temperature. The third preset temperature is lower than the first preset temperature and may not fall within the temperature range of the first threshold and the second threshold, so This third preset temperature can compensate for the additional heat absorbed by the fluid caused by the above factors, so that the temperature of the fluid that undergoes heat exchange with the battery 10 is within the temperature range from the first threshold to the second threshold.

It should be understood that the first preset value and the second preset value described in this application are both greater than zero.

In this embodiment, by designing different refrigeration methods for the fluid, the power station in actual production and life can flexibly select different refrigeration methods to cool the fluid according to its own facilities, further improving the overall performance of the thermal management system.

Figure 4 is another schematic flow chart of a control method 300 of a thermal management system according to an embodiment of the present application. As shown in Figure 4, method 300 also includes:

S303, obtain the first pressure p, which is the pressure of the fluid at the second position.

S304, control the flow rate of the fluid circulation circuit according to the first pressure p.

Specifically, the control method 300 of the present application controls the temperature of the battery by controlling the temperature of the fluid in the fluid circulation circuit and performing heat exchange with the battery 10 . The pressure of the fluid in the fluid circulation loop has an impact on the heat exchange performance of the fluid and the life of the circulation loop. For example, when the pressure of the fluid is too high, on the one hand, the flow rate of the fluid is too fast, which is not conducive to sufficient heat exchange between the fluid and the battery 10; on the other hand, the excessive pressure may cause damage to the pipelines of the fluid circulation circuit, thus Affects the performance and life of the heat exchange system. For another example, if the pressure of the fluid is too small, the flow rate of the fluid is too slow, or there is not enough fluid flow in the fluid circulation loop, the fluid and the battery 10 cannot fully exchange heat, which affects the heat exchange performance of the heat exchange system.

In the method 300, the pressure of the fluid is controlled by obtaining the first pressure p at the second position and adjusting the flow rate of the fluid in the circulation loop according to the first pressure p. The second position is a position where the fluid flows in a direction close to the battery 10 . That is, after passing through the second position, the fluid will pass through the thermal management component of the battery 10 or pass through the part of the fluid circulation loop arranged around the battery 10 to interact with the battery 10 . exchange. The first pressure p can reflect the flow rate of the fluid that is about to exchange heat with the battery 10 . Adjusting the flow rate of the fluid in the fluid circulation loop according to the first pressure p helps ensure a safe and efficient heat exchange process between the fluid and the battery 10 .

In this embodiment, by obtaining the first pressure p and accurately regulating the pressure in the fluid circulation loop according to the first pressure p, the thermal management performance and service life of the thermal management system can be effectively improved, helping to improve the performance and safety of the battery 10 sex.

Optionally, in S304, controlling the flow rate of the fluid in the fluid circulation loop according to the first pressure p includes:

In the case where the first pressure is less than the third threshold, control the flow rate to increase until the first pressure is greater than or equal to the third threshold; or

In the case where the first pressure is greater than the fourth threshold, the flow rate is controlled to decrease until the first pressure is less than or equal to the fourth threshold.

Specifically, the fourth threshold is greater than the third threshold, and the range from the third threshold to the fourth threshold is a pressure range suitable for the performance of the battery 10 and the life of the fluid circulation circuit. The first pressure p is less than the third threshold, indicating that the fluid pressure is small, and the fluid flow rate may be insufficient, and the flow rate needs to be increased to increase the pressure; the first pressure p is greater than the fourth threshold value, indicating that the fluid pressure is large, and the fluid flow rate is too large, and it is necessary to increase the pressure. Reduce flow to reduce pressure.

In this embodiment, by regulating the first pressure p, the flow rate of the fluid that is about to undergo heat exchange with the battery 10 can be controlled in a timely manner, and the flow rate of the fluid can be controlled within an appropriate range, thereby preventing the fluid flow rate from being too large or excessive. Little adverse impact on the heat exchange process or the life of the fluid circulation loop.

For example, the third threshold is greater than or equal to 1.25bar and less than or equal to 1.75bar; the fourth threshold is greater than or equal to 2bar and less than or equal to 2.5bar.

Optionally, the fluid includes at least one of water, purified water, saline solution, and liquid nitrogen.

Optionally, the power station is one of a power swap station, an energy storage power station, and a transformer substation.

Next, the structure of a thermal management system 500 provided by the embodiment of the present application will be further introduced.

FIG. 5 is a schematic structural diagram of a thermal management system 500 according to an embodiment of the present application. The thermal management system 500 is used to adjust the temperature of the battery 10 in the power station.

As shown in FIG. 5 , the thermal management system 500 includes a fluid circulation loop 501 and a control unit 502 . The fluid circulation loop 501 contains fluid, and the fluid circulation loop 501 is connected to the thermal management component of the battery 10 or at least part of the fluid circulation loop 501 is disposed around the battery 10 for heat exchange with the battery. The control unit 502 is used to obtain the first temperature T1 and the second temperature T1, and heat or cool the fluid according to the first temperature T1 and the second temperature T2. Wherein, the first temperature T1 is the temperature of the fluid at a first position in the fluid circulation circuit, and the second temperature T2 is the temperature of the fluid at a second position in the fluid circulation circuit. At the first position, the fluid flows in a direction away from the battery 10. In the second position, the fluid flows in a direction close to the battery 10 .

It should be understood that the control unit 502 may include a heating module, a cooling module, a connecting circuit, and other parts, and the control unit controls the heating module and the cooling module to heat or cool the fluid. The heating module can be an electric heater, an infrared heater, etc., and the refrigeration module can be a compression refrigeration equipment, absorption refrigeration equipment, steam injection refrigeration equipment, etc. The embodiments of the present application do not limit this.

Optionally, the control unit 502 is configured to heat the fluid to increase the second temperature T2 when the first temperature T1 is less than the first threshold, or to heat the fluid to increase the second temperature T2 when the first temperature T1 is greater than the second threshold. Cool to lower the second temperature T2.

Optionally, the control unit 502 is used to heat the fluid to increase the second temperature T2 to a first preset temperature, which is greater than or equal to the first threshold and less than or equal to the second threshold.

Optionally, the control unit 502 is used to heat the fluid to increase the second temperature T2 to a third preset temperature, where the second preset temperature is the first preset temperature plus the first preset value, and the first preset temperature is The setting value is set according to at least one of the ambient temperature, the distance between the second position and the battery 10 , and the length of the fluid circulation loop between the second position and the battery 10 .

Optionally, the control unit 502 is used to cool the fluid to reduce the second temperature T2 to the first preset temperature.

Optionally, the control unit 502 is used to refrigerate the fluid to reduce the second temperature T2 to a third preset temperature, where the third preset temperature is the first preset temperature minus the second preset value, and the second preset temperature The value is set based on at least one of ambient temperature, the distance of the second location from the battery 10 , and the length of the fluid circulation loop between the second location and the battery 10 .

Optionally, the control unit 502 is also used to obtain a first pressure p, and control the flow rate of the fluid circulation circuit 501 according to the first pressure p, where the first pressure is the pressure of the fluid at the second position.

It should be understood that the control unit 502 may also include a flow adjustment module, and the flow detection module may include components such as a press and a flow adjustment valve. The control unit 502 obtains the first pressure through the flow adjustment module and adjusts the flow rate of the fluid in the circulation loop 501 .

Optionally, the control unit 502 is configured to control the flow rate to increase until the first pressure is greater than or equal to the third threshold when the first pressure is less than the third threshold; or to control the flow rate when the first pressure is greater than the fourth threshold. The flow rate is reduced until the first pressure is less than or equal to the fourth threshold.

Each module or unit in the thermal management system 500 can be used to execute each step in the control method 300 of the thermal management system 500 to achieve similar technical effects, which will not be described again here.

In addition, the control module 502 may be a single-chip microcomputer, the main control of the power station, or a single-chip microcomputer connected to the main control of the power station, etc. For example, the control module may also include a memory, a processor, a communication interface, etc.

An embodiment of the present application also provides a thermal management device. As shown in FIG. 6 , the thermal management device 600 includes a processor 601 and a memory 602 . The memory 602 stores computer program instructions, and the processor 601 is used to execute the computer program instructions. When executing computer program instructions, the processor 601 can implement the control method 300 of the thermal management system 500 in any embodiment of the present application.

The above-mentioned memory 602 can be a read-only memory (ROM), a static storage device and a random access memory (random access memory, RAM), and computer programs can be stored in the memory.

The processor 601 can be a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU) or one or more The integrated circuit is used to execute relevant programs to realize the functions required to be performed by the units and modules in the thermal management system of the embodiment of the present application.

The processor 601 may also be an integrated circuit chip with signal processing capabilities. During the implementation process, the functions required to be performed by the units and modules in the thermal management system 500 in the embodiment of the present application can be completed by instructions in the form of hardware integrated logic circuits or software in the processor 601 .

The above-mentioned processor 601 can also be a general-purpose processor, digital signal processing (DSP), ASIC, off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by the hardware processor 601, or executed by a combination of hardware and software modules in the processor 601. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the functions required to be performed by the units and modules included in the device of the embodiment of the application in combination with its hardware.

It should be noted that although the thermal management device 600 mentioned above only mentions the memory 802 and the processor 601, during the specific implementation process, according to specific needs, those skilled in the art will understand that the thermal management device 600 may also include a communication interface and an implementation. Other hardware devices with additional functions. In addition, those skilled in the art should understand that the thermal management device 600 may only include components necessary to implement the embodiments of the present application.

Embodiments of the present application also provide a computer storage medium. Computer execution instructions are stored in the computer storage medium. When executed by the processor 601, the computer execution instructions can implement the control method of the thermal management system 500 in any embodiment of the present application. 300.

It should be understood that all or part of the steps to implement the above method embodiments can be completed by hardware related to program instructions. The program may be stored in a computer storage medium. When the program is executed, the steps including the above method embodiments are executed; computer storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory) , magnetic disks or optical disks and other media that can store program code.

The embodiment of the present application also uses a power swap station. FIG. 7 is a schematic structural diagram of a power swap station 700 according to the embodiment of the present application. As shown in FIG. 7 , the power swap station 700 includes the thermal management system 500 in any possible embodiment of the present application.

An embodiment of the present application also provides an energy storage power station. FIG. 8 is a schematic structural diagram of an energy storage power station 800 according to this embodiment. As shown in FIG. 8 , the energy storage power station 800 includes the thermal management system 500 in any possible embodiment of the present application.

In the several embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling or direct coupling or communication connection between each other shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

In addition, each functional unit in various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer storage medium. Based on this understanding, the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.

It should be understood that the specific examples herein are only to help those skilled in the art better understand the embodiments of the present application, but are not intended to limit the scope of the embodiments of the present application.

It should also be understood that in the various embodiments of the present application, the size of the sequence numbers of each process does not mean the order of execution. The execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

It should also be understood that the various implementation modes described in this specification can be implemented individually or in combination, and the embodiments of the present application are not limited to this.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for components thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A control method for a thermal management system, characterized in that the thermal management system is used to adjust the temperature of batteries in a power station, the thermal management system includes a fluid circulation loop, the fluid circulation loop contains fluid, and the fluid circulation The loop is connected to the thermal management component of the battery or at least part of the fluid circulation loop is provided around the battery for heat exchange with the battery;

The methods include:

Obtain a first temperature and a second temperature, the first temperature is the temperature of the fluid at a first position in the fluid circulation loop, and the second temperature is the temperature of the fluid at a second position in the fluid circulation loop. temperature, the fluid flows in a direction away from the battery in the first position, and the fluid flows in a direction close to the battery in the second position;

The fluid is heated or cooled based on the first temperature and the second temperature.
The method of claim 1, wherein heating or cooling the fluid according to the first temperature and the second temperature includes:

If the first temperature is less than a first threshold, the fluid is heated to increase the second temperature.
The method of claim 1, wherein heating or cooling the fluid according to the first temperature and the second temperature includes:

In the event that the first temperature is greater than a second threshold, the fluid is cooled to reduce the second temperature.
The method of claim 2, wherein heating the fluid to increase the second temperature includes:

The fluid is heated to increase the second temperature to a first preset temperature that is greater than or equal to the first threshold and less than or equal to the second threshold.
The method of claim 2, wherein controlling the second temperature increase includes:

heating the fluid to increase the second temperature to a second preset temperature, the second preset temperature being the first preset temperature plus a first preset value;

Wherein, the first preset value is set according to at least one of the ambient temperature, the distance between the second position and the battery, and the length of the fluid circulation loop between the second position and the battery to which it belongs.
The method of claim 3, wherein said cooling the fluid to reduce the second temperature includes:

The fluid is cooled to reduce the second temperature to the first preset temperature.
The method of claim 3, wherein controlling the second temperature reduction includes:

cooling the fluid to reduce the second temperature to a third preset temperature, the third preset temperature being the first preset temperature minus a second preset value;

Wherein, the second preset value is set according to at least one of the ambient temperature, the distance between the second position and the battery, and the length of the fluid circulation loop between the second position and the battery to which it belongs.
The method according to any one of claims 1-7, characterized in that the method further includes:

Obtaining a first pressure, the first pressure being the pressure of the fluid at the second position;

The flow rate of the fluid circulation circuit is controlled based on the first pressure.
The method of claim 8, wherein controlling the flow rate of the fluid in the fluid circulation loop according to the first pressure includes:

In the case where the first pressure is less than a third threshold, controlling the flow rate to increase until the first pressure is greater than or equal to the third threshold; or

In the case where the first pressure is greater than the fourth threshold, the flow rate is controlled to decrease until the first pressure is less than or equal to the fourth threshold.
The method according to any one of claims 1 to 9, wherein the fluid includes at least one of water, purified water, saline solution, and liquid nitrogen.
The method according to any one of claims 1-10, characterized in that the power station is a power swap station.
The method according to any one of claims 1-10, characterized in that the power station is an energy storage power station.
A thermal management system, characterized in that the thermal management system is used to regulate the temperature of batteries in a power station, and the thermal management system includes:

A fluid circulation loop, with fluid in the fluid circulation loop, is connected to the thermal management component of the battery, or at least part of the fluid circulation loop is disposed around the battery for communicating with the battery. Batteries are hot swapped;

A control unit, the control unit is used to obtain a first temperature and a second temperature, the first temperature is the temperature of the fluid at a first position in the fluid circulation loop, the second temperature is the temperature of the fluid circulation The temperature of the fluid at a second position in the circuit, where the fluid flows in a direction away from the battery, and where the fluid flows in a direction close to the battery; according to the The first temperature and the second temperature heat or cool the fluid.
The thermal management system of claim 13, wherein the control unit is configured to heat the fluid to increase the second temperature when the first temperature is less than a first threshold.
The thermal management system according to claim 13, wherein the control unit is configured to cool the fluid to reduce the second temperature when the first temperature is greater than a second threshold.
The thermal management system according to claim 14, wherein the control unit is configured to heat the fluid to increase the second temperature to a first preset temperature, the first preset temperature Greater than or equal to the first threshold and less than or equal to the second threshold.
The thermal management system according to claim 14, wherein the control unit is used to heat the fluid to increase the second temperature to a second preset temperature, and the second preset temperature is The first preset temperature plus the first preset value;

Wherein, the first preset value is set according to at least one of the ambient temperature, the distance between the second position and the battery, and the length of the fluid circulation loop between the second position and the battery to which it belongs.
The thermal management system of claim 13, wherein the control unit is configured to cool the fluid to reduce the second temperature to the first preset temperature.
The thermal management system of claim 13, wherein the control unit is configured to cool the fluid to reduce the second temperature to a third preset temperature, the third preset temperature being the The first preset temperature minus the second preset value;

Wherein, the second preset value is set according to at least one of the ambient temperature, the distance between the second position and the battery, and the length of the fluid circulation loop between the second position and the battery to which it belongs.
The thermal management system according to any one of claims 13-19, characterized in that the control unit is also used to obtain a first pressure, the first pressure being the pressure of the fluid at the second position ; Control the flow rate of the fluid circulation circuit according to the first pressure.
The thermal management system according to claim 20, wherein the control unit is configured to, when the first pressure is less than a third threshold, control the flow rate to increase until the first pressure is greater than or equal to the third threshold; or in the case where the first pressure is greater than the fourth threshold, controlling the flow rate to decrease until the first pressure is less than or equal to the fourth threshold.
The thermal management system according to any one of claims 13 to 21, wherein the fluid includes at least one of water, purified water, brine solution, and liquid nitrogen.
The thermal management system according to any one of claims 13-22, characterized in that the power station is a power swap station.
The thermal management system according to any one of claims 13-22, characterized in that the power station is an energy storage power station.
A thermal management device, characterized in that the thermal management device includes:

processor and memory;

Wherein, computer program instructions are stored in the memory, and the processor is used to execute the computer program instructions. When the processor executes the computer program instructions, the thermal process as claimed in any one of claims 1-12 is realized. Management system control methods.
A computer storage medium, characterized in that computer execution instructions are stored in the computer storage medium, and when the computer execution instructions are executed by a processor, they are used to implement thermal management as claimed in any one of claims 1-12. System control methods.
A power swap station, characterized in that the power swap station includes the thermal management system according to any one of claims 13-24.
An energy storage power station, characterized in that the energy storage power station includes the thermal management system according to any one of claims 13-24.