CN118336232A - Control method and control device of battery thermal management system, battery pack and vehicle - Google Patents

Abstract

The application provides a control method and a control device of a battery thermal management system, a battery pack and a vehicle. The battery thermal management system comprises a first heat exchange loop, a second heat exchange loop and a battery module communicated with the first heat exchange loop and the second heat exchange loop, wherein the battery module comprises at least two battery core areas and a plurality of battery cores connected in series, part of the battery cores are positioned in one battery core area, and the rest of the battery cores are positioned in other battery core areas; the control method comprises the following steps: determining a cell region where a thermal runaway cell in a thermal runaway state is located in the plurality of cells; and controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located. So set up, but the region that the accurate positioning thermal runaway electric core is located, the selection corresponds the return circuit, and the selectivity is high, and the cooling rate is faster, more accurate, reduces the possibility that appears the potential safety hazard, improves battery module's security.

Description

Control method and control device of battery thermal management system, battery pack and vehicle

Technical Field

The present application relates to the field of thermal management, and in particular, to a control method and device for a battery thermal management system, a battery pack, and a vehicle.

Background

The thermal management of the battery module is one of important conditions for ensuring the normal operation of the vehicle, and the battery thermal management system has very important influences on the safety, service life, performance and energy utilization efficiency of the battery module. The battery thermal management system is mainly arranged for heat exchange of the battery module. When the battery thermal management system is actually applied, the thermal runaway phenomenon caused by the rapid temperature rise in the battery module can occur when the battery module has large time work load, heat dissipation failure or short circuit and the like. In the related art, when the thermal runaway phenomenon occurs, the mode is single, the cooling speed is low, and the cooling speed is not accurate enough, so that risks such as explosion possibly generated due to the thermal runaway phenomenon are increased.

Disclosure of Invention

The application provides a control method, a control device, a battery pack and a vehicle of a battery thermal management system, which have the advantages of single mode, high cooling speed, more accuracy, reduced risk and improved safety.

The application provides a control method of a battery thermal management system, which comprises a first heat exchange loop, a second heat exchange loop and a battery module communicated with the first heat exchange loop and the second heat exchange loop, wherein the battery module comprises at least two battery core areas and a plurality of battery cores connected in series, part of the battery cores in the plurality of battery cores are positioned in one battery core area, and the rest of the battery cores are positioned in the other battery core areas; the control method comprises the following steps:

determining a cell region where a thermal runaway cell in a thermal runaway state is located in the plurality of cells; and

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located.

Optionally, before determining a cell region where a thermal runaway cell in the plurality of cells in a thermal runaway state is located, the control method further includes:

Numbering the plurality of battery cells;

Dividing the plurality of electric cores into at least two electric core areas according to electric core numbers of the plurality of electric cores, enabling part of the electric cores in the plurality of electric cores to be positioned in one electric core area, and enabling the rest electric cores to be positioned in the other electric core areas.

Optionally, the determining the cell area where the thermal runaway cell in the thermal runaway state is located in the plurality of cells includes:

acquiring the temperature of each battery cell, wherein when the temperature of at least one battery cell exceeds a temperature threshold value, the battery cell is determined to be a thermal runaway battery cell;

And determining the position of the thermal runaway battery cell according to the battery cell number of the thermal runaway battery cell, and determining the battery cell region according to the position of the thermal runaway battery cell.

Optionally, before determining a cell region where a thermal runaway cell in the plurality of cells in a thermal runaway state is located, the control method further includes:

and acquiring the average temperature of each cell region, wherein when the average temperature of one cell region exceeds an average temperature threshold value, the cell region is determined to be the cell region where the thermal runaway cell in the thermal runaway state is located.

Optionally, the battery thermal management system comprises an inlet pipe and an outlet pipe, and the battery module comprises a first interface and a second interface; the inlet pipe is communicated with the first interface, and the second interface is communicated with the outlet pipe to form a first heat exchange loop; the battery thermal management system comprises a first switching branch and a second switching branch; the inlet pipe is communicated with the second interface through the first switching branch and the first interface is communicated with the outlet pipe through the second switching branch to form a second heat exchange loop;

The battery module at least comprises a first battery cell area arranged at the first interface and a second battery cell area arranged at the second interface;

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, including:

When the cell area where the cell is located is determined to be the first cell area, controlling the first heat exchange loop to perform thermal runaway treatment on the cell in the thermal runaway state; or (b)

And when the heat exchange area where the battery core is located is determined to be the second battery core area, controlling the second heat exchange loop to perform thermal runaway treatment on the battery core in the thermal runaway state.

Optionally, the battery module further includes a third cell region, where the third cell region is located between the first cell region and the second cell region;

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, including:

And when the cell area where the cell is located is determined to be the third cell area, controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the cell in the thermal runaway state.

Optionally, the battery thermal management system further comprises a cooling mode; after controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, the control method further includes:

Sending out corresponding thermal runaway early warning information of the thermal runaway battery cell; and/or

And starting the cooling mode and controlling cooling equipment to fill cooling medium into one of the first heat exchange loop or the second heat exchange loop.

The present application also provides a computer-readable medium having stored thereon a computer program which, when executed by a processor, implements the control method of the battery thermal management system of any one of the above.

The application also provides a control device of the battery thermal management system, which comprises a control method for realizing any one of the battery thermal management systems.

The application also provides a battery pack, which comprises the control device of the battery thermal management system.

The application also provides a vehicle comprising the battery pack.

According to the control method, the control device, the battery pack and the vehicle of the battery thermal management system, the region where the thermal runaway battery core is located in the thermal runaway state can be accurately determined by determining the region where the thermal runaway battery core is located in the plurality of battery cores, one of the first heat exchange loop and the second heat exchange loop is controlled to carry out thermal runaway treatment on the battery core in the thermal runaway state according to the region where the thermal runaway battery core is located, so that the region where the thermal runaway battery core is located can be accurately positioned, the corresponding heat exchange loop is selected, the selectivity is high, the cooling speed is faster and more accurate, the possibility of potential safety hazards is reduced, and the safety inside the battery module is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram of one embodiment of a battery thermal management system of the present application.

Fig. 2 is a schematic diagram of a further embodiment of the battery thermal management system of the present application.

Fig. 3 is a flowchart illustrating an embodiment of a control method of the battery thermal management system of the present application.

Fig. 4 is a flowchart illustrating a control method of the battery thermal management system according to still another embodiment of the present application.

Reference numerals illustrate:

A battery thermal management system 100; a battery management system 200; an inlet pipe 1; an outlet pipe 2; a first switching leg 3; a second switching leg 4; a battery module 5; a first interface 51; a second interface 52; a battery cell 53; a communication line 54; a first cell region 55; a second cell region 56; a third cell region 57; a temperature sensor 6.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus consistent with aspects of the application as detailed in the accompanying claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims do not denote a limitation of quantity, but rather denote the presence of at least one. The term "plurality" includes two, corresponding to at least two. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

The application provides a control method and a control device of a battery thermal management system, a battery pack and a vehicle. The battery thermal management system comprises a first heat exchange loop, a second heat exchange loop and a battery module communicated with the first heat exchange loop and the second heat exchange loop, wherein the battery module comprises at least two battery core areas and a plurality of battery cores connected in series, part of the battery cores are positioned in one battery core area, and the rest of the battery cores are positioned in other battery core areas; the control method comprises the following steps: determining a cell region where a thermal runaway cell in a thermal runaway state is located in the plurality of cells; and controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located. So set up, through the electric core region that is in the electric core of thermal runaway state among a plurality of electric cores, can accurate thermal runaway electric core place region, according to the electric core region that thermal runaway electric core is located, one of them in control first heat transfer circuit and the second heat transfer circuit carries out thermal runaway processing to the electric core that is in the thermal runaway state, so can pinpoint the electric core region that thermal runaway electric core is located, thereby select corresponding heat transfer circuit, the selectivity is high, the cooling rate is faster, more accurate, reduce the possibility of appearing the potential safety hazard, improve the inside security of battery module.

The control method, the control device, the battery pack and the vehicle of the battery thermal management system of the present application will be described in detail with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.

FIG. 1 is a schematic diagram illustrating one embodiment of a battery thermal management system 100 of the present application. In the embodiment shown in fig. 1, the vehicle includes a battery thermal management system 100. The battery thermal management system 100 is used to manage and regulate the temperature of the battery module 5 in the vehicle. The battery thermal management system 100 includes an inlet pipe 1, an outlet pipe 2, a battery module 5, and a first heat exchange circuit, which communicates with the battery module 5. One end of the inlet pipe 1 is used to connect with the battery module 5, and the other end is used to connect with other components in the battery thermal management system 100 so that fluid medium can flow into the inlet pipe 1 from the other components in the battery thermal management system 100. One end of the outlet pipe 2 is used to connect with the battery module 5, and the other end is used to connect with other components in the battery thermal management system 100 so that the fluid medium can flow from the outlet pipe 2 into the other components in the battery thermal management system 100. The battery module 5 includes a first interface 51 and a second interface 52. The first and second interfaces 51 and 52 are used to circulate a fluid medium between the interior of the battery module 5 and other components of the battery thermal management system 100. The inlet pipe 1 communicates with the first interface 51 and the second interface 52 communicates with the outlet pipe 2 and forms a first heat exchange circuit. In this embodiment, after the fluid medium enters from the inlet pipe 1, the fluid medium enters the main body of the battery module 5 through the first interface 51, passes through the main body of the battery module 5, passes out of the second interface 52, and finally flows out of the outlet pipe 2, so that heat exchange to the battery module 5 is realized. Specifically, the inlet of the inlet pipe 1 is communicated with other components of the battery thermal management system 100, the outlet of the inlet pipe 1 is communicated with the inlet of the first interface 51, the outlet of the first interface 51 is communicated with a part of structures inside the battery module 5, the part of structures inside the battery module 5 is communicated with the inlet of the second interface 52, the outlet of the second interface 52 is communicated with the inlet of the outlet pipe 2, and the outlet of the outlet pipe 2 is communicated with other components of the battery thermal management system 100.

Fig. 2 is a schematic diagram of yet another embodiment of a battery thermal management system 100 of the present application. In the embodiment shown in fig. 2, the battery thermal management system 100 includes a first switching leg 3, a second switching leg 4, and a second heat exchange circuit in communication with the battery module. The inlet pipe 1 communicates with the second connection 52 via the first switching branch 3 and the first connection 51 communicates with the outlet pipe 2 via the second switching branch 4 and forms a second heat exchange circuit. In this embodiment, after entering from the inlet pipe 1, the fluid medium enters the main body of the battery module 5 through the first switching branch 3, then through the second interface 52, and then passes from the second switching branch 4 to the outlet pipe 2 through the first interface 51, so as to exchange heat with the battery module 5. Specifically, the inlet of the inlet pipe 1 is communicated with other components of the battery thermal management system 100, the outlet of the inlet pipe 1 is communicated with the inlet of the first switching branch 3, the outlet of the first switching branch 3 is communicated with the inlet of the second interface 52, the outlet of the second interface 52 is communicated with a part of structures inside the battery module 5, the part of structures inside the battery module 5 is communicated with the inlet of the first interface 51, the outlet of the first interface 51 is communicated with the inlet of the second switching branch 4, the outlet of the second switching branch 4 is communicated with the inlet of the outlet pipe 2, and the outlet of the outlet pipe 2 is communicated with other components of the battery thermal management system 100. This arrangement allows the battery thermal management system 100 to have two heat exchange circuits, one that keeps the inlet tube 1 in communication with the first interface 51 and the second interface 52 in communication with the outlet tube 2. Secondly, keep import pipe 1 to pass through first switching branch 3 and second interface 52 intercommunication, and first interface 51 passes through second switching branch 4 and export pipe 2 intercommunication, can make the difference in temperature of battery module 5 reduce through the switching of above two kinds of passageways, and can reach better battery module 5 temperature regulation effect, and then save the energy consumption of vehicle, guarantee the duration of vehicle, improve battery module 5's life-span and security.

In the embodiment shown in fig. 2, the battery module 5 includes a communication pipe 54 disposed between two adjacent battery cells 53 of the plurality of battery cells 53, that is, the plurality of battery cells 53 and the communication pipe 54 are part of the structure of the interior of the battery module 5, and the communication pipe 54 communicates with the first interface 51 and the second interface 52. The communication pipe 54 is used for circulating fluid medium so as to exchange heat with the plurality of electric cells 53 in the battery module 5. So set up, make things convenient for a plurality of electric core 53 all to be adjacent with the intercommunication pipeline 54, make things convenient for a plurality of electric core 53 inside the battery module 5 all can be by heat transfer. In some embodiments, the communication pipeline 54 may further cool the plurality of electric cells 53 in the battery module 5 through other paths, for example, a Z-type path, a W-type path, etc., and the communication pipeline 54 may be disposed according to the arrangement of the plurality of electric cells 53 in the battery module 5. In the present embodiment, the plurality of battery cells 53 may be sequentially arranged in the length direction and the width direction of the battery module 5. In other embodiments, the plurality of battery cells 53 are arranged in order in the width direction of the battery module 5. In other embodiments, the plurality of battery cells 53 may be sequentially arranged in the length direction of the battery module 5. In some embodiments, the battery module 5 further includes a plurality of temperature sensors 6 inside, and the temperature sensors 6 are used to detect a temperature difference inside the battery module 5. In some embodiments, the temperature sensor 6 may be disposed in different areas inside the battery module 5 to detect, such as providing a plurality of temperature sensors 6 near the communication line 54. In other embodiments, the temperature sensor 6 may also be located close to where each cell 53 is located. In other embodiments, the temperature sensor 6 may be disposed at a location where each of the battery cells 53 is located. So configured, the plurality of temperature sensors 6 are used to detect temperatures of different areas of the battery module 5 and output a corresponding plurality of electrical signals. So set up, the temperature detection of battery module 5 is more accurate, can be better control and know battery module 5's difference in temperature.

In the embodiment shown in fig. 2, the vehicle further includes a battery pack including a control device of the battery thermal management system 100, and a controller, the control device of the battery thermal management system 100 being configured to implement the control method of the battery thermal management system 100. In some embodiments, the control device may be the battery management system 200. The Battery management system 200 may be a BMS (collectively referred to as Battery MANAGEMENT SYSTEM) for detecting the operating state of the Battery module 5, etc. In this embodiment, the battery management system 200 is used to control switching from the first heat exchange circuit to the second heat exchange circuit or from the second heat exchange circuit to the first heat exchange circuit. The intelligent operation of the vehicle can be guaranteed by the aid of the control device, and the heat exchange loop is convenient to adjust and switch. In other embodiments, the switching from the first heat exchange circuit to the second heat exchange circuit or the switching from the second heat exchange circuit to the first heat exchange circuit may also be controlled by other control devices of the vehicle, but is not limited thereto.

In the embodiment shown in fig. 2, the battery module 5 further includes at least two cell regions for sensing the state of the battery cells 53 in the regions, and the state of the battery cells 53 may be a thermal runaway state or a normal state. The plurality of battery cells 53 are connected in series. Some of the plurality of cells 53 are located in one of the cell regions and the remaining cells 53 are located in the other cell regions. In the present embodiment, the plurality of battery cells 53 may be 60 battery cells 53, but may be other number, not limited thereto. The cell regions may be provided in 2, 3, 4, etc., the number is not limited thereto. The battery module 5 includes at least a first cell region 55 provided at the first interface 51 and a second cell region 56 provided at the second interface 52. the first cell region 55 is disposed proximate to the first interface 51 relative to the second cell region 56, and the second cell region 56 is disposed proximate to the second interface 52 relative to the first cell region 55. In this embodiment, the condition that the fluid medium flows through the path of the communication pipeline 54 to exchange heat with the electric core 53 at the same flow rate near the first interface 51 may mean that the fluid medium enters the second interface 52, and when entering from the first interface 51, the fluid medium can exchange heat with a part of the electric core 53 more quickly, and the part of the electric core 53 may be the electric core 53 in the first electric core area 55. In this embodiment, the condition that the fluid medium flows through the path of the communication pipeline 54 to exchange heat with the electric core 53 at the same flow rate near the second interface 52 may mean that the fluid medium enters the first interface 51, and when entering from the second interface 52, the fluid medium can exchange heat with a part of the electric core 53 more quickly, and at this time, the part of the electric core 53 may be the electric core 53 in the second electric core region 56. in some embodiments, the battery module 5 may only provide the first cell area 55 and the second cell area 56, where the battery cells 53 of the battery module 5 may have a portion of the battery cells 53 disposed near the first interface 51 relative to the second cell area 56 and the remaining portion of the battery cells 53 disposed near the first interface 51 relative to the second cell area 56. In some embodiments, the battery module 5 may further include a portion of the battery cells 53 disposed not closer to the first interface 51 than the second battery cell region 56, nor closer to the first interface 51 than the second battery cell region 56, where more battery cell regions may be disposed. The battery module 5 further comprises a third cell region 57, the third cell region 57 being located between the first cell region 55 and the second cell region 56. In the present embodiment, three cell regions are provided in total, and a part of the cells 53 of the third cell region 57 are disposed close to the first interface 51 with respect to neither the second cell region 56 nor the first interface 51 with respect to the second cell region 56. In this embodiment, the third cell region 57 is located between the first cell region 55 and the second cell region 56, which may mean that when the fluid medium flows through the path of the communication pipeline 54 to exchange heat with the cells 53 at the same flow rate, the fluid medium enters from the second interface 52 and enters from the first interface 51 to exchange heat with part of the cells 53 at the same speed, and at this time, part of the cells 53 may be the cells 53 in the third cell region 57.

Fig. 3 is a flowchart illustrating an embodiment of a control method of the battery thermal management system of the present application. As shown in fig. 3, the control method of the battery thermal management system includes steps S100 and S200.

And step S100, determining a cell area where the thermal runaway cell in the thermal runaway state is located in the plurality of cells.

In some embodiments, a thermal runaway cell in a thermal runaway state may be that the cell in the battery module is overcharged or overdischarged, resulting in more heat generation inside the cell. The battery module can also suffer from short circuit and other phenomena, so that the current passing through the battery core is overlarge, and more heat is generated. The battery cell can also be used under the high temperature condition, so that the temperature of the battery cell is increased, and the like. In some embodiments, the temperature of the thermal runaway cell in the thermal runaway state may be abnormal in temperature, abnormal in current, abnormal in voltage, or the like, compared to other cells in normal states, not limited thereto.

In some embodiments, the thermal runaway cells and the areas or locations where the thermal runaway is located may be determined by numbering or the like. In some embodiments, the plurality of cells are numbered. In some embodiments, the plurality of cells are numbered sequentially in a flow-through order. The flow sequence may be a flow sequence of the fluid medium within the battery module. Specifically, the flow sequence may be a corresponding sequence in which the fluid medium exchanges heat with the plurality of electric cells in sequence in the interior of the battery module from the inlet side of the battery module to the outlet side of the battery module. In this embodiment, when the switching is performed to the first heat exchange circuit, the fluid medium sequentially enters the first interface, the communication pipeline and the second interface in the battery module, and the flow sequence of the fluid medium is a corresponding sequence in which the fluid medium flows from the first interface to the flow pipeline of the second interface to sequentially exchange heat with the plurality of electric cores. In this embodiment, when the switching is performed to the second heat exchange circuit, the fluid medium sequentially enters the second interface, the communication pipeline and the first interface in the battery module, and the flowing sequence of the fluid medium is a corresponding sequence of sequentially exchanging heat between the plurality of electric cores through the flow pipeline from the second interface to the first interface. In other embodiments, when the plurality of electric cores can be simultaneously heat-exchanged by the circulation pipeline in parallel, that is, the fluid medium can heat-exchange the plurality of electric cores at the same time, the electric cores which are heat-exchanged by the circulation medium at the same time in the battery module are divided into the same electric core areas, and the electric cores which are heat-exchanged at the same time are specially numbered or the electric cores which are heat-exchanged at the same time are set in the same area in advance, and the like, the method is not limited to this. So set up, when the circulation pipeline sets up to the heat transfer simultaneously to a plurality of electric cores, also can correctly judge the electric core region that part electric core in a plurality of electric cores is located, improve the accuracy. In some embodiments, the numbering information is stored for post-processing, facilitating control. By the arrangement, the area where the thermal runaway battery cell is located or the specific position of the thermal runaway battery cell can be conveniently searched, and the thermal runaway accuracy of the battery module is higher.

In some embodiments, the plurality of cells is divided into at least two cell regions according to the cell numbers of the plurality of cells, so that a portion of the plurality of cells are located in one of the cell regions and the remaining cells are located in the other cell regions. In some embodiments, the plurality of cells may be divided into two cell regions by cell numbering, for example, 48 cells are provided in the battery module, and 1-24 are divided into one cell region, and then the one cell region is one of the cell regions; 25-48 are divided into one region, then this one cell region is the other cell region. In some embodiments, the plurality of cells may be divided into three cell regions by cell numbering, for example, 60 cells are provided in the battery module, and 1-24 are divided into one cell region, and then the one cell region is one of the cell regions; the two cell regions are other cell regions if 25-36 are divided into one region and 37-60 are divided into one region. The arrangement is convenient for dividing the cell area in the battery module, and is easy to control and operate.

In some embodiments, the temperature of each cell is obtained, wherein when the temperature of at least one cell exceeds a temperature threshold, the cell is determined to be a thermal runaway cell. In some embodiments, the location of the thermal runaway cell is determined based on the cell number of the thermal runaway cell and the cell region in which the thermal runaway cell is located is determined based on the location of the thermal runaway cell. In some embodiments, when the temperature of one cell exceeds a temperature threshold, one cell is identified as a thermal runaway cell, the location of the thermal runaway cell is determined based on the cell number of the thermal runaway cell, and the cell region in which the thermal runaway cell is located is determined based on the location of the thermal runaway cell. In some embodiments, when the temperature of two or more cells exceeds the temperature threshold, determining that the two or more cells are thermal runaway cells, obtaining a cell number with the highest temperature in the thermal runaway cells, determining the position of the thermal runaway cell according to the cell number of the thermal runaway cell with the highest temperature, and determining the cell region according to the position of the thermal runaway cell. By the arrangement, the battery cell with larger thermal runaway risk can be reduced more quickly. In some embodiments, the temperature threshold may be a fixed value that is set, and the temperature threshold at which the battery cell reaches thermal runaway may be determined according to a conventional temperature range of the battery module. In other embodiments, it may also be determined whether the battery cell is in a thermal runaway state by determining the voltage or current of the battery cell in the battery module, which is not limited thereto. The temperature-based temperature sensor is arranged in this way, and the temperature-based temperature sensor is simple and easy to operate and set. And this mode can be according to the electric core serial number of abnormal temperature, the thermal runaway electric core of location that can be accurate, and the degree of accuracy is high, and the heat transfer effect is better.

In some embodiments, an average temperature of each cell region is obtained, wherein when the average temperature of one of the cell regions exceeds an average temperature threshold, the cell region is determined as the cell region in which the thermal runaway cell in the thermal runaway state is located. The average temperature of a cell region refers to the average of the sum of the temperatures of each cell within the cell region. The average temperature threshold may be a fixed value, and the average temperature threshold for the battery cell to reach thermal runaway may be determined according to a conventional temperature range of the battery module. In other embodiments, it may also be determined whether the battery cell is in a thermal runaway state by determining an average voltage or an average current of the battery cell area in the battery module, which is not limited thereto. The temperature-based temperature sensor is arranged in this way, and the temperature-based temperature sensor is simple and easy to operate and set. Moreover, the abnormal state can be generated according to the average temperature of the battery cell area, the thermal runaway battery cell can be rapidly positioned, the mode is simple, and the responsiveness is high. In other embodiments, the average temperature of each cell region is obtained, where when the average temperature of the plurality of cell regions exceeds the average temperature threshold, two or more cell regions are confirmed to be thermal runaway cells, the cell region with the highest average temperature in the cell regions where the plurality of thermal runaway cells are located is obtained, and the cell region with the highest average temperature is taken as the cell region where the thermal runaway cell in the thermal runaway state is located. And step 200, controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located.

In some embodiments, the first heat exchange loop is controlled to perform thermal runaway treatment on the cell in a thermal runaway state according to the cell region in which the thermal runaway cell is located. In some embodiments, the second heat exchange loop is controlled to perform thermal runaway treatment on the cell in the thermal runaway state according to the cell region in which the thermal runaway cell is located. So set up, through the electric core region that is in the electric core of thermal runaway state among a plurality of electric cores, can accurate thermal runaway electric core place region, according to the electric core region that thermal runaway electric core is located, one of them in control first heat transfer circuit and the second heat transfer circuit carries out thermal runaway processing to the electric core that is in the thermal runaway state, so can pinpoint the electric core region that thermal runaway electric core is located, thereby select corresponding heat transfer circuit, the selectivity is high, the cooling rate is faster, more accurate, reduce the possibility of appearing the potential safety hazard, improve the inside security of battery module.

Fig. 4 is a flowchart illustrating a control method of the battery thermal management system according to still another embodiment of the present application. As shown in fig. 4, step S200 includes step S201, step S202, and step S203.

And step 201, when the cell area where the cell is located is determined to be the first cell area, controlling the first heat exchange loop to perform thermal runaway treatment on the cell in a thermal runaway state.

In this embodiment, the first electric core area is close to the first interface relative to the second electric core area, and the first heat exchange loop is formed by the first interface inlet and the second interface outlet. In this embodiment, when it is determined that the heat exchange area where the battery cell is located is the first battery cell area, the thermal runaway process is to open the first heat exchange loop, so that the fluid medium can enter the battery module through the first interface, enter the first battery cell area through the path of the communication pipeline at a faster speed to exchange heat with the thermal runaway battery cell, and then flow out from the second interface through the communication pipeline. So set up, the electricity core that is in the thermal runaway state in being less than the electric core region of convenience can be by first heat transfer circuit heat transfer fast, reduces the potential safety hazard, improves the inside security of battery module.

And step S202, when the heat exchange area where the battery core is located is determined to be a second battery core area, controlling a second heat exchange loop to perform thermal runaway treatment on the battery core in a thermal runaway state.

In this embodiment, the second electric core area is disposed close to the second interface relative to the first electric core area, and the second heat exchange loop is the second interface inlet and the first interface outlet. In this embodiment, when it is determined that the heat exchange area where the battery cell is located is the second battery cell area, the thermal runaway process is to open the second heat exchange loop, so that the fluid medium can enter the battery module through the second interface, enter the second battery cell area through the path of the communication pipeline at a faster speed to exchange heat with the thermal runaway battery cell, and then flow out from the first interface through the communication pipeline. So set up, the electricity core that is in the thermal runaway state in being less than the electric core region of convenience can be by the heat transfer of second heat exchange circuit fast, reduces the potential safety hazard, improves the inside security of battery module.

And step 203, when the cell region where the cell is located is determined to be the third cell region, controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the cell in a thermal runaway state.

In this embodiment, when it is determined that the cell region where the cell is located is the third cell region, the first heat exchange circuit is controlled to perform thermal runaway processing on the cell in the thermal runaway state. In this embodiment, when it is determined that the cell area where the cell is located is the third cell area, the thermal runaway process is to open the first heat exchange loop, so that the fluid medium can enter the battery module through the first interface, enter the third cell area through the path of the communication pipeline to exchange heat with the thermal runaway cell, and then flow out from the second interface through the communication pipeline. In other embodiments, when the cell region where the cell is located is determined to be the third cell region, the second heat exchange circuit is controlled to perform thermal runaway treatment on the cell in the thermal runaway state. In other embodiments, when the cell area where the cell is located is determined to be the third cell area, the thermal runaway process is to open the second heat exchange loop, so that the fluid medium can enter the battery module through the second interface, enter the third cell area through the path of the communication pipeline to exchange heat with the thermal runaway cell, and then flow out from the first interface through the communication pipeline. The third electric core area is positioned between the first electric core area and the second electric core area, one of the heat exchange loops is selected, and the control mode is simple and easy to operate.

In some embodiments, the control method further comprises sending out thermal runaway warning information of the corresponding thermal runaway cell. In some embodiments, the thermal runaway warning information may be that after the battery cell is in a thermal runaway state, the control device sends the thermal runaway warning to a user, so that the user knows that the battery module is in the thermal runaway state, thereby ensuring self safety. So set up, make thermal runaway phenomenon can be sent fast, promoted personnel's safety problem fast. The thermal runaway early warning information can also be that after the battery cell is in a thermal runaway state, the control device sends out the thermal runaway early warning to other equipment, so that the battery cell can be timely subjected to heat exchange. By the arrangement, the thermal runaway phenomenon can timely respond to other components of the battery thermal management system, and the heat exchange speed of the thermal runaway battery cell is improved.

In some embodiments, the battery thermal management system further comprises a cooling mode. The cooling mode is one mode of working condition requirements of the battery module, and the working condition requirements of the battery module further comprise heating and temperature equalization, wherein when the battery module has the working condition requirements of heating, a fluid medium is used for increasing the temperature of the battery module, and the heating mode needs to be started; when the battery module has the cooling working condition requirement, the fluid medium is used for reducing the temperature of the battery module, and a cooling mode is required to be started; when the battery module has the working condition requirement of uniform temperature, the heating or cooling function of the battery module is utilized to realize the uniform temperature, namely, the fluid medium is used for increasing the temperature of the battery module or reducing the temperature of the battery module. In some embodiments, the cooling mode is turned on and the cooling apparatus is controlled to fill one of the first heat exchange loop or the second heat exchange loop with a cooling medium. The cooling device may be a radiator, a cooling assembly, or the like. The cooling medium may be water or other cooling liquid. In some embodiments, the cooling mode is turned on and the cooling device is controlled to fill the first heat exchange circuit with cooling medium. In some embodiments, the cooling mode is turned on and the cooling device is controlled to fill the second heat exchange circuit with cooling medium. The first heat exchange loop or the second heat exchange loop is selected and determined according to the cell area where the thermal runaway cell is located. So set up, through cooling mode for thermal runaway battery core of thermal runaway state can be cooled down fast, through the mode of filling coolant, can realize the inside quick cooling of battery module, and the mode is simple.

In other embodiments, when the cell area where the cell is located is determined to be the third cell area, the determination may also be made by determining whether the battery module is in the operating state and the current heat exchange mode. In some embodiments, the battery thermal management system includes a non-operational state and an operational state. The non-operation state is the state before the battery thermal management system is started or before the battery thermal management system is switched to the working condition state, and the battery module has different working condition demands, such as heating, cooling or temperature equalization. The running state is a state after the battery thermal management system is started or after the working condition state is switched. In some embodiments, the battery module thermal management system includes a first heat exchange mode and a second heat exchange mode. In some embodiments, the heat exchange circuit of the first heat exchange mode of the battery module may be one of the first heat exchange circuit or the second heat exchange circuit. In this embodiment, the first heat exchange mode may be a first heat exchange circuit, and the second heat exchange mode is a second heat exchange circuit. In some embodiments, a first heat exchange mode of the battery module is determined as an initial heat exchange mode. In some embodiments, the initial heat exchange mode may be a default heat exchange mode that the battery thermal management system initially uses at startup. In other embodiments, the initial heat exchange mode may also be an initial default use heat exchange mode of the battery thermal management system during the switch operating condition. In some embodiments, a first temperature difference of the battery module in an initial heat exchange mode is obtained; and when the first temperature difference reaches a first temperature difference threshold value, switching the first heat exchange mode into a second heat exchange mode. In some embodiments, the first temperature difference threshold may be a fixed value that is set, and in this embodiment, the first temperature difference threshold may be between 1-4 ℃, for example, 1 ℃,2 ℃,3 ℃, or 4 ℃, and may be determined according to the battery module or the vehicle requirement.

In some embodiments, the first temperature difference refers to a difference between an average temperature of the partial battery modules near the first interface side and an average temperature of the partial battery modules near the second interface side, or a difference between an average temperature of the partial battery modules near the second interface side and an average temperature of the partial battery modules near the first interface side. In other embodiments, the method of obtaining the highest temperature or the lowest temperature may be set, and is not limited thereto.

In some embodiments, when the battery thermal management system performs the cooling mode, the first temperature difference may be an average temperature of a portion of the battery modules near the outlet side minus an average temperature of a portion of the battery modules near the inlet side. The cooling mode is used for reducing the temperature inside the battery module, and when a cooling medium enters the inlet side, the temperature of the part of the battery module close to the inlet side is reduced faster than the temperature of the part of the battery module close to the outlet side, so that the temperature difference is increased, and when the average temperature of the part of the battery module close to the outlet side minus the average temperature of the part of the battery module close to the inlet side reaches a temperature difference threshold value, a switching circuit is needed to reduce the temperature difference. Specifically, when the heat exchange circuit is a first heat exchange circuit, the first interface side is an inlet side, the second interface side is an outlet side, and the first temperature difference may be the average temperature of the part of the battery modules close to the second interface side minus the average temperature of the part of the battery modules close to the first interface side in the cooling mode; when the heat exchange loop is the second heat exchange loop, the second interface side is the inlet side, the first interface side is the outlet side, and the first temperature difference can be the average temperature of the part of the battery modules close to the first interface side minus the average temperature of the part of the battery modules close to the second interface side in the cooling mode. In some embodiments, when the battery thermal management system executes the cooling mode and the heat exchange loop is the first heat exchange loop, the average temperature of the part of the battery modules near the first interface side is obtained, the average temperature of the part of the battery modules near the second interface side is obtained, and according to the average temperature, it is determined that the first temperature difference of the battery modules under the first heat exchange loop is the difference of the average temperature of the part of the battery modules near the second interface side minus the average temperature of the part of the battery modules near the first interface side. In some embodiments, when the battery thermal management system executes the cooling mode and the heat exchange loop is the second heat exchange loop, the average temperature of the part of the battery modules near the first interface side is obtained, the average temperature of the part of the battery modules near the second interface side is obtained, and according to the average temperature, the first temperature difference of the battery modules under the second heat exchange loop is determined as the difference of the average temperature of the part of the battery modules near the first interface side minus the average temperature of the part of the battery modules near the second interface side. In other embodiments, the control method is performed in a temperature equalization mode, and when the temperature equalization is achieved by reducing the temperature medium of the battery module, the control method is similar to the cooling mode, and will not be repeated here. In some embodiments, a number of times the first heat exchange mode is continuously switched to the second heat exchange mode is determined, and the initial heat exchange mode is switched from the first heat exchange mode to the second heat exchange mode when the number of times the switching reaches a threshold number of times of switching. In some embodiments, the number of consecutive switches to the second heat exchange mode may be a cumulative number of consecutive switches that the battery thermal management system needs to switch from one of the initial heat exchange modes to the other heat exchange mode by detecting the first temperature difference and comparing the first temperature difference threshold at each start-up or each switch condition. In some embodiments, the handoff number threshold may be a fixed value that is set. In this embodiment, the threshold number of switching times is 3. In other embodiments, the threshold number of handovers may be 2 times, 4 times, 5 times, 6 times, etc., and the number is not limited thereto. In this embodiment, when the battery thermal management system is in the starting state or before the switching of the working condition state, that is, the first heat exchange mode is the initial heat exchange mode, and when the battery thermal management system is in the starting state or after the switching of the working condition state, the initial heat exchange mode is found to need to use the second heat exchange mode by detecting a temperature difference or the like, the first heat exchange mode needs to be switched to the second heat exchange mode. When the battery heat management system is in the starting state or is in the working condition switching state for 3 times continuously, the battery heat management system needs to be switched from the first heat exchange mode to the second heat exchange mode of the initial heat exchange mode, and then the initial heat exchange mode is changed from the first heat exchange mode to the second heat exchange mode. In this case, the second heat exchange mode is determined as the initial heat exchange mode before the next battery thermal management system is in the start-up state or before the switching of the operating state. Through the accumulation mode of big data, the flexible change of the initial heat exchange mode can be ensured, and the heat exchange step is further reduced.

The present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of controlling the battery thermal management system 100. In some embodiments, the computer readable storage medium may be an internal storage unit, such as a hard disk or memory, of the battery thermal management system 100 of any of the previous embodiments. The computer readable storage medium may also be an external storage device of the battery thermal management system 100, such as a plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), SD card, flash memory card (FLASH CARD), etc. provided on the device. Further, the computer readable storage medium may also include both internal storage units and external storage devices of the battery thermal management system 100. The computer readable storage medium is used to store a computer program and other programs and data required by the battery thermal management system 100, and may also be used to temporarily store data that has been output or is to be output.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the application.

Claims (11)

1. The control method of the battery thermal management system is characterized in that the battery thermal management system comprises a first heat exchange loop, a second heat exchange loop and a battery module communicated with the first heat exchange loop and the second heat exchange loop, the battery module comprises at least two battery core areas and a plurality of battery cores connected in series, part of the battery cores in the plurality of battery cores are positioned in one battery core area, and the rest of the battery cores are positioned in the other battery core areas; the control method comprises the following steps:

determining a cell region where a thermal runaway cell in a thermal runaway state is located in the plurality of cells; and

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located.

2. The control method of a battery thermal management system according to claim 1, wherein the determining a cell region in which a thermal runaway cell in a thermal runaway state of the plurality of cells is located further comprises:

Numbering the plurality of battery cells;

Dividing the plurality of electric cores into at least two electric core areas according to electric core numbers of the plurality of electric cores, enabling part of the electric cores in the plurality of electric cores to be positioned in one electric core area, and enabling the rest electric cores to be positioned in the other electric core areas.

3. The method of claim 2, wherein the determining a cell region in which a thermal runaway cell of the plurality of cells in a thermal runaway state is located comprises:

acquiring the temperature of each battery cell, wherein when the temperature of at least one battery cell exceeds a temperature threshold value, the battery cell is determined to be a thermal runaway battery cell;

And determining the position of the thermal runaway battery cell according to the battery cell number of the thermal runaway battery cell, and determining the battery cell region according to the position of the thermal runaway battery cell.

4. The control method of a battery thermal management system according to claim 1, wherein the determining a cell region in which a thermal runaway cell in a thermal runaway state of the plurality of cells is located further comprises:

and acquiring the average temperature of each cell region, wherein when the average temperature of one cell region exceeds an average temperature threshold value, the cell region is determined to be the cell region where the thermal runaway cell in the thermal runaway state is located.

5. The method of claim 1, wherein the battery thermal management system comprises an inlet pipe and an outlet pipe, and the battery module comprises a first interface and a second interface; the inlet pipe is communicated with the first interface, and the second interface is communicated with the outlet pipe to form a first heat exchange loop; the battery thermal management system comprises a first switching branch and a second switching branch; the inlet pipe is communicated with the second interface through the first switching branch and the first interface is communicated with the outlet pipe through the second switching branch to form a second heat exchange loop;

The battery module at least comprises a first battery cell area arranged at the first interface and a second battery cell area arranged at the second interface;

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, including:

When the cell area where the cell is located is determined to be the first cell area, controlling the first heat exchange loop to perform thermal runaway treatment on the cell in the thermal runaway state; or (b)

And when the heat exchange area where the battery core is located is determined to be the second battery core area, controlling the second heat exchange loop to perform thermal runaway treatment on the battery core in the thermal runaway state.

6. The method of claim 5, wherein the battery module further comprises a third cell region, the third cell region being located between the first cell region and the second cell region;

And controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, including:

And when the cell area where the cell is located is determined to be the third cell area, controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the cell in the thermal runaway state.

7. The control method of a battery thermal management system according to claim 1, wherein the battery thermal management system further comprises a cooling mode; after controlling one of the first heat exchange loop and the second heat exchange loop to perform thermal runaway treatment on the battery cell in the thermal runaway state according to the battery cell region where the thermal runaway battery cell is located, the control method further includes:

Sending out corresponding thermal runaway early warning information of the thermal runaway battery cell; and/or

And starting the cooling mode and controlling cooling equipment to fill cooling medium into one of the first heat exchange loop or the second heat exchange loop.

8. A computer-readable medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the control method of the battery thermal management system according to any one of claims 1 to 7.

9. A control device of a battery thermal management system, characterized by comprising a control method for realizing the battery thermal management system according to any one of claims 1 to 7.

10. A battery pack comprising the control device of the battery thermal management system according to claim 9.

11. A vehicle comprising the battery pack of claim 10.