WO2023087176A1

WO2023087176A1 - Temperature measurement system and method

Info

Publication number: WO2023087176A1
Application number: PCT/CN2021/131212
Authority: WO
Inventors: 刘浩东; 李琳; 常静静; 张亮; 王勇; 艾伟
Original assignee: 华为技术有限公司
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2023-05-25

Abstract

A temperature measurement system (100) and method, used for accurately measuring the temperature of at least one cell (201, 202, 203, 204) in a battery pack (200) and reducing the complexity of temperature measurement. The temperature measurement system (100) comprises a first ultrasonic transducer (101), a second ultrasonic transducer (102), and a control module (103). The first ultrasonic transducer (101) and the second ultrasonic transducer (102) are respectively connected to the control module (103). The first ultrasonic transducer (101) is disposed at a first position on each cell, and the second ultrasonic transducer (102) is disposed at a second position on each cell. The first ultrasonic transducer (101) is used for sending a first ultrasonic signal from the first position. The second ultrasonic transducer (102) is used for receiving the first ultrasonic signal from the second position. The control module (103) is used for obtaining a first wave speed of the first ultrasonic signal propagating from the first position to the second position, and obtaining, according to the first wave speed, a first temperature corresponding to a first path in each cell.

Description

A temperature measurement system and method

technical field

The embodiments of the present application relate to the technical field of batteries, and in particular to a temperature measurement system and method.

Background technique

During the use of batteries, the requirements for safety are extremely high. For example, thermal runaway of lithium-ion batteries will occur during use, resulting in fire and explosion. Before the thermal runaway of the battery occurs, the temperature of the battery will rise significantly. When the temperature reaches the melting temperature of the battery diaphragm, the diaphragm will be damaged, and the battery will The short circuit between the positive and negative electrodes will generate more heat, and a chain reaction will occur, leading to the spread of thermal runaway. Therefore, it is of great significance to accurately detect the temperature inside the battery.

At present, there is a scheme of using electrochemical impedance spectroscopy (EIS) to detect the temperature of the battery, which mainly includes: applying small-amplitude AC potential waves of different frequencies to the battery multiple times, and measuring the relationship between the AC potential and the current signal. The ratio (this ratio is used as the impedance of the battery) changes with the frequency of the sine wave, or the phase angle of the impedance of the battery changes with the frequency of the sine wave. It is necessary to provide a large amount of data in different frequency bands for multiple measurements before the battery can be obtained. The EIS of the battery, and the EIS of the battery is correlated with the temperature of the battery within a certain frequency range. By measuring the change and relaxation time of different frequency bands of the EIS, the temperature inside the battery can be measured.

The above technical solution has at least the following problems: a large amount of data needs to be provided to measure the battery before the battery’s EIS can be obtained, and the EIS of batteries with different components varies greatly, and the measurement of battery temperature has problems of large error and high complexity.

Contents of the invention

Embodiments of the present application provide a temperature measurement system and method for accurately measuring the temperature of at least one battery cell in a battery pack to reduce the complexity of temperature measurement. In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

In the first aspect, an embodiment of the present application provides a temperature measurement system for measuring the temperature of at least one battery cell in a battery pack, and the temperature measurement system includes: a first ultrasonic transducer, a second ultrasonic A transducer and a control module, wherein, the first ultrasonic transducer and the second ultrasonic transducer are respectively connected to the control module; the first ultrasonic transducer is located at each The first position on the electric core, the second ultrasonic transducer is arranged at the second position on each electric core; the first ultrasonic transducer is used to transmit the first ultrasonic transducer from the first position Ultrasonic signal; the second ultrasonic transducer is used to receive the first ultrasonic signal from the second position; the control module is used to obtain the first ultrasonic signal transmitted from the first position to The first wave velocity at the second position; obtain the first temperature corresponding to the first path in each cell according to the first wave velocity, wherein the first path is the first position and the first path The ultrasonic propagation path between the second location. In the above solution, each cell can be used as an ultrasonic propagation medium, the first ultrasonic signal can propagate from the first position to the second position in the cell, and the control module is connected with the first ultrasonic transducer and the second ultrasonic transducer respectively. Connected to the device, the control module can obtain the first wave speed of the first ultrasonic signal propagating on the first path. Since the temperature of the battery core is directly related to the wave speed of the ultrasonic signal, the corresponding wave speed of the first path can be obtained according to the first wave speed. The first temperature, which can be used as the current temperature in each battery cell, can accurately measure the temperature of at least one battery cell in the battery pack, reducing the complexity of temperature measurement.

In a possible implementation manner, the temperature measurement system further includes: a third ultrasonic transducer, wherein the third ultrasonic transducer is connected to the control module, and the third ultrasonic transducer The transducer is arranged at a third position on each cell; the third ultrasonic transducer is used to receive the first ultrasonic signal from the third position; the control module is used to obtain the The second wave speed of the first ultrasonic signal propagating from the first position to the third position; obtain the second temperature corresponding to the second path in each cell according to the second wave speed, the second The path is an ultrasonic propagation path between the first location and the third location. In the above solution, in addition to propagating along the first path, the first ultrasonic signal may also propagate within each cell along a second path, and the second path is an ultrasonic propagation path between the first position and the third position. The control module may acquire the second temperature corresponding to the second path in a manner similar to that of acquiring the first temperature. Multiple ultrasonic transducers can be arranged on each cell, and the first ultrasonic signal sent by the first ultrasonic transducer can be received by multiple ultrasonic transducers, so the temperature on multiple paths can be measured, by This can obtain the temperature values of different positions on the battery pack.

In a possible implementation manner, the control module is further configured to: obtain the temperature field in each battery cell according to the first temperature and the second temperature, and the temperature field includes: each The temperature corresponding to multiple positions in the cell. In the above solution, the temperature measurement system can accurately measure the temperature field of each cell, so that the temperature field of each cell can be obtained by sending an ultrasonic signal through the first ultrasonic transducer, that is, to the temperature of multiple locations, thereby improving the efficiency of temperature measurement.

In a possible implementation manner, the control module is configured to determine the thermal conductivity coefficients corresponding to multiple positions in each cell; obtain the multiple thermal conductivity coefficients according to the thermal conductivity coefficients corresponding to the multiple positions The heat conduction relationship satisfied by the temperatures corresponding to the positions respectively; taking the first temperature and the second temperature as the boundary temperature conditions in each cell, and obtaining the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions respectively The temperature field in each cell. In the above scheme, the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions can be obtained through the heat conduction coefficients corresponding to the multiple positions respectively. For example, the above heat conduction relationship can be the heat conduction calculation method satisfied by the temperature of each position in the multiple positions. Taking the first temperature and the second temperature as the boundary temperature conditions in each cell, the temperature field in each cell is obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions. For example, with the first temperature corresponding to the first path and the second temperature corresponding to the second path as boundary conditions, the temperature field in each cell can be calculated through the heat conduction calculation method that the temperature of each position in multiple positions satisfies, The temperature field includes temperatures at different locations inside each cell.

It can be understood that the control module can input the corresponding temperatures on different paths into the preset temperature calculation model, so as to obtain the temperatures of multiple locations, or after the control module obtains the corresponding temperatures on different paths, it can query the preset temperature. The temperature field relationship table is set to obtain the temperatures of multiple locations. In the embodiment of the present application, there are multiple implementation methods for the specific calculation of the temperature field. The foregoing is an example scenario that can be realized, and is not used to limit the embodiment of the application.

In a possible implementation manner, the first ultrasonic transducer is configured to send the first ultrasonic signal from the first position within a first time period; the second ultrasonic transducer is configured to receiving the first ultrasonic signal from the second position within the first time period; the second ultrasonic transducer is also used to transmit a second ultrasonic signal from the second position within a second time period Ultrasonic signal; the first ultrasonic transducer is also used to receive the second ultrasonic signal from the first position within the second time period; the control module is also used to: acquire the first ultrasonic signal The second ultrasonic signal propagates from the second position to the third wave speed of the first position; according to the third wave speed, the third temperature corresponding to the first path is obtained; wherein, the first time period and the The second time period is two different temperature measurement time periods. In the above solution, through the above time-sharing polling method, the control module can obtain the first temperature and the third temperature measured in different time periods, so as to obtain multiple temperatures of each battery cell at different times, and realize Real-time measurement of the temperature inside the cell.

It should be noted that the control module obtains the first temperature corresponding to the first path in the first time period, and also obtains the third temperature corresponding to the first path in the second time period, then the first temperature and the second temperature The three temperatures correspond to different moments of the first path, so the embodiments of the present application can realize real-time measurement of the temperature in the battery core.

In a possible implementation manner, the at least one battery cell includes: a plurality of different battery cells, and time periods corresponding to the multiple different battery cells for sending and receiving the first ultrasonic signal are different time periods.

In the above solution, the battery pack includes a plurality of different batteries, and the temperature of different batteries is measured by time-sharing polling. Through the above-mentioned time-sharing polling, the control module can obtain the temperature of different batteries at different times , to achieve real-time measurement of the temperature of the battery cells in the battery pack.

In a possible implementation manner, the control module is further configured to detect whether at least one of the first ultrasonic transducer and the second ultrasonic transducer is abnormal, so as to obtain a detection result. In the above solution, the control module may also perform abnormality detection on the first ultrasonic transducer and the second ultrasonic transducer, thereby determining whether at least one of the first ultrasonic transducer and the second ultrasonic transducer is abnormal, Improve the reliability and robustness of temperature measurement systems.

An example is as follows, the control module detects whether the first ultrasonic transducer and the second ultrasonic transducer are abnormal within the first time period, so as to obtain the first detection result; detect the first ultrasonic transducer Whether the transducer and the second ultrasonic transducer are abnormal within the second time period to obtain a second detection result; determine the first ultrasonic transducer according to the first detection result and the second detection result Whether there is abnormality in the transducer or the second ultrasonic transducer. In the above solution, abnormality detection is performed on the first ultrasonic transducer and the second ultrasonic transducer within different temperature measurement time periods, so as to determine whether there is an abnormality in the first ultrasonic transducer or the second ultrasonic transducer, Improve the reliability and robustness of temperature measurement systems.

In a possible implementation manner, the control module is further configured to report the first temperature through a wired network or a wireless network. In the above solution, the control module also has a temperature reporting function. After the control module detects the temperature in the battery cells in the battery pack, it can report the first temperature through a wired network or a wireless network.

In the second aspect, the embodiment of the present application also provides a temperature measurement method, the temperature measurement method is used to measure the temperature of at least one battery cell in the battery pack, the first position on each battery cell in the at least one battery cell A first ultrasonic transducer is provided, and a second ultrasonic transducer is provided at a second position on each cell; the method includes:

sending a first ultrasonic signal from the first location through the first ultrasonic transducer;

receiving the first ultrasonic signal from the second location via the second ultrasonic transducer;

acquiring a first wave velocity at which the first ultrasonic signal propagates from the first position to the second position;

Acquiring a first temperature corresponding to a first path in each cell according to the first wave velocity, wherein the first path is an ultrasonic propagation path between the first position and the second position.

In a possible implementation manner, a third ultrasonic transducer is provided at a third position on each cell, and the method further includes:

receiving the first ultrasonic signal from the third location via the third ultrasonic transducer;

acquiring a second wave velocity of the first ultrasonic signal propagating from the first position to the third position;

Acquiring a second temperature corresponding to a second path in each cell according to the second wave velocity, the second path being an ultrasonic propagation path between the first position and the third position.

In a possible implementation, the method further includes:

Acquiring a temperature field in each battery cell according to the first temperature and the second temperature, where the temperature field includes: temperatures respectively corresponding to multiple positions in each battery cell.

In a possible implementation manner, the temperature in the first cell is obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions in the first cell, the first temperature, and the second temperature. A temperature field, where the temperature field includes: temperatures respectively corresponding to multiple positions in the first battery cell.

In a possible implementation manner, the first temperature and the second temperature are obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions in each battery cell, and the The temperature field in , including:

determining the thermal conductivity coefficients respectively corresponding to multiple positions in each cell;

Obtaining the heat conduction relationship satisfied by the temperatures respectively corresponding to the multiple positions according to the heat conduction coefficients respectively corresponding to the multiple positions;

Taking the first temperature and the second temperature as the boundary temperature conditions in each battery cell, and obtaining the temperature field in each battery cell according to the heat conduction relationship satisfied by the temperatures respectively corresponding to the multiple positions .

In a possible implementation manner, the sending the first ultrasonic signal from the first position through the first ultrasonic transducer includes: sending the first ultrasonic signal from the first position within a first time period through the first ultrasonic transducer the first location sends the first ultrasonic signal;

The receiving the first ultrasonic signal from the second location through the second ultrasonic transducer includes: receiving the first ultrasonic signal from the second location within the first time period through the second ultrasonic transducer receiving the first ultrasonic signal;

The obtaining the first wave speed of the first ultrasonic signal propagating from the first position to the second position includes: obtaining the first wave speed of the first ultrasonic signal within the first time period ;

The obtaining the first temperature corresponding to the first path in each battery cell according to the first wave speed includes: obtaining the temperature corresponding to the first path within the first time period according to the first wave speed. said first temperature;

The method also includes:

sending a second ultrasonic signal from the second location through the second ultrasonic transducer for a second period of time;

receiving the second ultrasonic signal from the first location by the first ultrasonic transducer during the second time period;

acquiring a third wave velocity of the second ultrasonic signal propagating from the second position to the first position within the second time period;

acquiring a third temperature corresponding to the first path within the second time period according to the third wave velocity;

Wherein, the first time period and the second time period are two different temperature measurement time periods.

In a possible implementation, the method further includes:

Detecting whether at least one of the first ultrasonic transducer and the second ultrasonic transducer is abnormal, so as to obtain a detection result.

An example is as follows, detecting whether the first ultrasonic transducer and the second ultrasonic transducer are abnormal within the first time period, so as to obtain a first detection result;

Detecting whether the first ultrasonic transducer and the second ultrasonic transducer are abnormal within the second time period, so as to obtain a second detection result;

Determine whether the first ultrasonic transducer or the second ultrasonic transducer is abnormal according to the first detection result and the second detection result.

In a possible implementation, the method further includes:

The first temperature is reported through a wired network or a wireless network.

In the second aspect of the present application, the constituent steps of the temperature measurement method are implemented by the control module described in the aforementioned first aspect and various possible implementations. For details, see the aforementioned first aspect and various possible implementations. instruction of.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the method described in the second aspect above.

In a fourth aspect, an embodiment of the present application provides a computer program product including instructions, which when run on a computer, causes the computer to execute the method described in the second aspect above.

In the fifth aspect, the embodiment of the present application provides a communication device, which may include entities such as terminal equipment or chips, and the communication device includes: a processor and a memory; the memory is used to store instructions; the processor is used to Executing the instructions in the memory causes the communication device to perform the method as described in any one of the foregoing second aspects. For example, the processor is specifically the control module described in the aforementioned first aspect.

In a sixth aspect, the present application provides a chip system, the chip system includes a processor, configured to support the communication device to implement the functions involved in the above aspect, for example, send or process the data and/or information involved in the above method . In a possible design, the chip system further includes a memory, and the memory is configured to store necessary program instructions and data of the communication device. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

In the embodiment of the present application, the temperature measurement system is used to measure the temperature of at least one cell in the battery pack, and the first ultrasonic transducer and the second ultrasonic transducer in the temperature measurement system are respectively connected to the control module; the first The ultrasonic transducer is arranged at a first position on each of the at least one electric core, and the second ultrasonic transducer is arranged at a second position on each electric core; the first ultrasonic transducer transmits from the first position The first ultrasonic signal; the second ultrasonic transducer receives the first ultrasonic signal from the second position; the control module obtains the first wave speed at which the first ultrasonic signal propagates from the first position to the second position; the control module obtains the first wave speed according to the first wave speed The first temperature corresponding to the first path in the cells, where the first path is the ultrasonic propagation path between the first position and the second position. In the embodiment of the present application, each electric core can be used as an ultrasonic propagation medium, and the first ultrasonic signal can propagate from the first position to the second position in the electric core, and the control module is connected with the first ultrasonic transducer and the second ultrasonic transducer respectively. Connected to the device, the control module can obtain the first wave speed of the first ultrasonic signal propagating on the first path. Since the temperature of the battery core is directly related to the wave speed of the ultrasonic signal, the corresponding wave speed of the first path can be obtained according to the first wave speed. The first temperature, which can be used as the current temperature in each battery cell, can accurately measure the temperature of at least one battery cell in the battery pack, reducing the complexity of temperature measurement.

Description of drawings

FIG. 1 is a schematic diagram of the composition and structure of a temperature measurement system provided in the embodiment of the present application;

Fig. 2 is a schematic diagram of the connection relationship between a control module, the first ultrasonic transducer, the second ultrasonic transducer and the battery pack provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of the composition and structure of another temperature measurement system provided in the embodiment of the present application;

4 is a schematic diagram of the connection relationship between a control module, a first ultrasonic transducer, a second ultrasonic transducer, a third ultrasonic transducer and a battery pack provided by an embodiment of the present application;

Fig. 5 is a schematic diagram of another connection relationship between a control module and a battery pack provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of a plurality of ultrasonic transducers provided on an electric core provided in an embodiment of the present application;

7 is a schematic diagram of sending ultrasonic signals from one ultrasonic transducer to three ultrasonic transducers in the same cell provided by the embodiment of the present application;

Fig. 8 is a schematic diagram of the distribution mode of the temperature field in the battery provided by the embodiment of the present application;

FIG. 9 is a schematic diagram of the composition and structure of another temperature measurement system provided in the embodiment of the present application;

FIG. 10 is a schematic block diagram of a temperature measurement method provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of the composition and structure of another temperature measurement system provided by the embodiment of the present application.

Wherein, the description of the reference signs involved in the above legend is as follows:

The temperature measurement system 100, the first ultrasonic transducer 101, the second ultrasonic transducer 102, the control module 103, the battery pack 200, the first electric core 201 in at least one electric core, the third ultrasonic transducer 104, at least The second cell 202 in one cell, the third cell 203 in at least one cell, the fourth cell 204 in at least one cell, a processor 1101 , a memory 1102 , a bus 1103 , and a communication interface 1104 .

Detailed ways

Embodiments of the present application provide a temperature measurement system and method for accurately measuring the temperature of at least one battery cell in a battery pack to reduce the complexity of temperature measurement.

The following first illustrate some terms and technologies involved in the embodiments of the present application:

The battery pack may also be referred to as a battery for short. The battery pack may include at least one cell, which includes an electrolyte solution and a metal electrode, and can convert chemical energy into electrical energy. In the embodiment of the present application, the number of cells included in the battery is not limited. The battery may be a lithium ion battery or other types of batteries, which is not limited here. In addition, the battery provided in the embodiment of the present application may be a power battery, for example, may be a battery applied to an on-board battery and an energy storage station of an electric vehicle.

A cell refers to a single electrochemical cell containing positive and negative electrodes, which is generally not used directly. The temperature inside the battery pack may be the temperature of the battery cells. In the embodiment of the present application, the battery cell has multiple surfaces, such as front, rear, left, and right surfaces. A surface of the cell can also be called a side. In the embodiment of the present application, in order to accurately measure the temperature inside the battery cell, multiple ultrasonic transducers are arranged on the surface of the battery cell, for example, two ultrasonic transducers can be provided, and the two ultrasonic transducers are arranged on different sides of the battery cell. On the surface. The ultrasonic transducer can be used to send ultrasonic signals, and can also be used to receive ultrasonic signals. When the ultrasonic transducer is used to receive ultrasonic signals, it can also be called an ultrasonic sensor. The ultrasonic signal sent by one ultrasonic transducer can pass through the inside of the cell and be received by another ultrasonic transducer. Not limited thereto, three or more ultrasonic transducers may also be arranged on the surface of the cell. In addition, in the embodiment of the present application, the distribution positions of the ultrasonic transducers on the surface of the cell also need to be flexibly determined according to the application scenario.

Ultrasonic transducers are capable of converting electrical signals into ultrasonic signals, or converting ultrasonic signals into electrical signals. The ultrasonic signal emitted by the ultrasonic transducer can propagate in different media, for example, it can propagate in the solid medium in the electric core. The ultrasonic signal in the embodiment of the present application may be a plate wave, a guided wave, or a body wave (also called a bulk acoustic wave), etc., which is not limited here.

The control module is a module for measuring the temperature in the cell, and the control module is connected to multiple ultrasonic transducers on the surface of the cell, for example, the control module is connected to each ultrasonic transducer through a connecting line, The control module can control multiple ultrasonic transducers to send and receive ultrasonic signals, so as to obtain the wave velocity of the ultrasonic signal in the cell. The wave speed refers to the transmission speed of the ultrasonic signal in the cell. The wave speed can also be called the ultrasonic sound velocity . The electric core is a solid medium. When the ultrasonic signal propagates in the electric core, the wave velocity is related to the density and elastic modulus of the medium. Fast; while the temperature will directly affect the elastic modulus and density of the medium, and then affect the wave velocity of the ultrasonic wave. Therefore, the current temperature of the battery cell can be reflected by the wave velocity, and the control module can determine the temperature in the battery cell according to the wave velocity of the ultrasonic signal.

Other terms are explained below:

In the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations or illustrations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete manner.

In the embodiments of the present application, the terms "second" and "first" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "second" or "first" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

The meaning of the term "at least one" in this application refers to one or more, and the meaning of the term "multiple" in this application refers to two or more, for example, multiple first messages refer to two or two more than one first message.

It is to be understood that the terminology used in describing the various described examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various described examples and in the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context dictates otherwise Clearly instruct.

It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and/or" is an association relationship describing associated objects, which means that there may be three kinds of relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists independently. situation. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

It should also be understood that in each embodiment of the present application, the size of the sequence numbers of the various processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, rather than by the implementation order of the embodiments of the present application. The implementation process constitutes no limitation.

It should be understood that determining B according to A does not mean determining B only according to A, and B may also be determined according to A and/or other information.

It is also to be understood that the term "comprises" (also "includes", "including", "comprises" and/or "comprising") when used in this specification designates the presence of stated features, integers, steps, operations, elements , and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groupings thereof.

It should also be understood that the term "if" may be construed to mean "when" ("when" or "upon") or "in response to determining" or "in response to detecting".

It should be understood that "one embodiment", "an embodiment" and "a possible implementation" mentioned throughout the specification mean that specific features, structures or characteristics related to the embodiment or implementation are included in this application. In at least one embodiment of . Therefore, appearances of "in one embodiment" or "in an embodiment" or "one possible implementation" throughout the specification do not necessarily refer to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

It should also be understood that the "connection" mentioned in the embodiments of the present application may be a direct connection, an indirect connection, a wired connection, or a wireless connection. The connection method is not limited.

The technical solutions provided by the embodiments of the present application will be described below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic diagram of the composition and structure of a temperature measurement system provided in the embodiment of the present application. The temperature measurement system 100 is used to measure the temperature of at least one battery cell in the battery pack, and the battery pack has one or more battery cells. Next, the temperature measurement process of each battery cell in the battery pack is used as an example to illustrate.

The temperature measurement system 100 includes: a first ultrasonic transducer 101, a second ultrasonic transducer 102 and a control module 103, wherein,

The first ultrasonic transducer 101 and the second ultrasonic transducer 102 are connected with the control module 103 respectively; the first ultrasonic transducer 101 is arranged at the first position on each electric core, and the second ultrasonic transducer 102 a second location on each cell;

A first ultrasonic transducer 101, configured to send a first ultrasonic signal from a first position;

A second ultrasonic transducer 102, configured to receive a first ultrasonic signal from a second position;

The control module 103 is configured to acquire a first wave velocity at which the first ultrasonic signal propagates from the first position to the second position; acquire the first temperature corresponding to the first path in each cell according to the first wave velocity, wherein the first path is the ultrasonic propagation path between the first position and the second position in each cell.

Wherein, the first ultrasonic transducer 101 and the second ultrasonic transducer 102 are arranged on the surface of each electric core. For example, the first ultrasonic transducer 101 is arranged at a first position on each electric core, the second ultrasonic transducer 102 is arranged at a second position on each electric core, and the first position and the second position are on the same side of the electric core. The specific position on the surface is not limited. Optionally, the first position and the second position are on different surfaces of each cell. The first position refers to the position coordinates of the first ultrasonic transducer 101 on the surface of the electric core. The first ultrasonic signal enters each electric core through the first position, propagates through the solid medium in each electric core, and The second position is detected by the second ultrasonic transducer 102 , and the second position refers to the position coordinates of the second ultrasonic transducer 102 on the surface of the electric core.

The control module 103 is connected with the first ultrasonic transducer 101 and the second ultrasonic transducer 102, and the control module 101 can be arranged outside the battery. For example, it is connected to the first ultrasonic transducer 101 and the second ultrasonic transducer 102 through connecting wires. The control module 103 can obtain the sending time of the first ultrasonic transducer 101 to send the first ultrasonic signal, and the control module 103 can also obtain the receiving time of the second ultrasonic transducer 102 receiving the first ultrasonic signal, which is the same as the time of the ultrasonic signal related to wave speed. The control module 103 can calculate the first wave speed of the first ultrasonic signal propagating from the first position to the second position, the first wave speed represents the propagation speed of the first ultrasonic signal in each cell, and the cell acts as a solid medium , when the ultrasonic signal propagates in the cell, the wave speed is related to the density and elastic modulus of the medium. The battery core acts as an elastic body. The ultrasonic signal exerts an external force on the elastic body, and the elastic body changes shape (called "deformation"). The elastic modulus is the stress divided by the strain in this direction under the unidirectional stress state. Different media have different wave velocities. The greater the elastic modulus and the lower the density of the medium, the faster the ultrasonic wave speed; and the temperature will directly affect the elastic modulus and density of the medium, and then affect the ultrasonic wave speed. The control module 103 obtains the first temperature corresponding to the first path in each cell according to the first wave velocity, wherein the first path is the ultrasonic propagation path between the first position and the second position in each cell, and the second An ultrasonic signal propagates along the first path to the second position in the cell, so that the first ultrasonic signal can be detected by the second ultrasonic transducer 102 . The current temperature of the battery cell is reflected by the first wave speed, and the control module 103 determines the first temperature in the battery cell according to the first wave speed.

In the embodiment of the present application, the temperature measurement system 100 adopts the transmission and reception of ultrasonic signals to measure the temperature in the battery core, without considering the difference in the material composition in the battery core, as the battery core is a solid medium, it can transmit ultrasonic signals, ultrasonic signals The wave velocity of the wave will reflect the temperature in the battery core, so the temperature measurement system 100 measures the temperature in the battery core by sending and receiving ultrasonic signals, which has the advantage of low test complexity and will not be affected by the material components in the battery core , capable of accurately measuring the temperature of at least one cell in the battery pack.

In some embodiments of the present application, as shown in FIG. 2 , it is a schematic diagram of a connection relationship among a control module, a first ultrasonic transducer, a second ultrasonic transducer and a battery pack provided in the embodiment of the present application. The battery pack 200 has a first battery cell 201, and the front surface and the upper surface of the first battery cell 201 are respectively provided with ultrasonic transducers. For example, the first ultrasonic transducer 101 is arranged on the front surface of the first battery cell 201. The two ultrasonic transducers 102 are disposed on the upper surface of the first cell 201 . The two ultrasonic transducers are connected to the control module 103 respectively. When one ultrasonic transducer sends an ultrasonic signal, the other ultrasonic transducer can detect the ultrasonic signal. Finally, the control module 103 measures the battery cell according to the ultrasonic signal transmission and reception. temperature inside. For example, when the first ultrasonic transducer 101 sends an ultrasonic signal, the second ultrasonic transducer 102 receives an ultrasonic signal, or when the second ultrasonic transducer 102 sends an ultrasonic signal, the first ultrasonic transducer 101 receives an ultrasonic signal . It should be noted that the first ultrasonic transducer 101 may be a transducer capable of transmitting and receiving ultrasonic signals, and the second ultrasonic transducer 102 may be a transducer capable of transmitting and receiving ultrasonic signals. Or the first ultrasonic transducer 101 can be a transducer that only has the function of sending ultrasonic signals, and the second ultrasonic transducer 102 can be a transducer that only has the function of receiving ultrasonic signals. There is no limit to the two capabilities of sending and receiving.

It should be noted that the temperature measurement of one battery cell in the battery pack is used as an example above. It is not limited that the battery pack can include multiple batteries, and each battery cell can be equipped with an ultrasonic transducer. Through the control module Realize the temperature measurement of each cell.

In some embodiments of the present application, as shown in FIG. 3 , the temperature measurement system 100 further includes: a third ultrasonic transducer 104, wherein,

The third ultrasonic transducer 104 is connected to the control module 103, and the third ultrasonic transducer 104 is arranged at a third position on each cell;

a third ultrasonic transducer 104, configured to receive a first ultrasonic signal from a third position;

The control module 103 is configured to acquire a second wave velocity at which the first ultrasonic signal propagates from the first position to the third position; acquire a second temperature corresponding to a second path in each cell according to the second wave velocity, and the second path is the second path An ultrasonic propagation path between a first location and a third location.

Wherein, in addition to setting the first ultrasonic transducer 101 and the second ultrasonic transducer 102 on each electric core, other ultrasonic transducers can also be provided, for example, a third ultrasonic transducer 104 is arranged on each electric core, The third ultrasonic transducer 104 is disposed at a third position on each cell. In addition to propagating according to the first path, the first ultrasonic signal can also propagate in each cell according to a second path, and the second path is the ultrasonic propagation path between the first position and the third position in each cell . Then the control module 103 can acquire the second temperature corresponding to the second path in a manner similar to that of acquiring the first temperature. For example, the control module 103 acquires a second wave velocity at which the first ultrasonic signal propagates from the first position to the third position; and acquires a second temperature corresponding to a second path in each cell according to the second wave velocity. Multiple ultrasonic transducers can be arranged on each cell, and the first ultrasonic signal sent by the first ultrasonic transducer can be received by multiple ultrasonic transducers, so the temperature on multiple paths can be measured, by This can obtain the temperature values of different positions on the battery pack.

In some embodiments of the present application, as shown in FIG. 4, a control module, a first ultrasonic transducer, a second ultrasonic transducer, a third ultrasonic transducer and a battery pack provided in the embodiments of the present application A schematic diagram of the connection relationship. The battery pack 200 has a first battery cell 201, and the front surface and the upper surface of the first battery cell 201 are respectively provided with ultrasonic transducers. For example, the first ultrasonic transducer 101 is arranged on the front surface of the first battery cell 201. The second ultrasonic transducer 102 is disposed on the upper surface of the first cell 201 , and the third ultrasonic transducer 104 is disposed on the upper surface of the first cell 201 . The three ultrasonic transducers are respectively connected with the control module 103. When one ultrasonic transducer sends an ultrasonic signal, the other two ultrasonic transducers can detect the ultrasonic signal, and finally the control module 103 measures the electric current according to the sending and receiving of the ultrasonic signal. core temperature. Not limited thereto, the second ultrasonic transducer 102 and the third ultrasonic transducer 104 may be arranged on the same surface of the first cell 201, or the second ultrasonic transducer 102 and the third ultrasonic transducer 104 It can be disposed on different surfaces of the first electric core 201 , for example, the third ultrasonic transducer 104 can be disposed on the rear surface of the first electric core 201 , which is not limited here.

In some embodiments of the present application, the control module 103 is also used to: obtain the temperature field in each cell according to the first temperature and the second temperature, and the temperature field includes: multiple positions in each cell corresponding to temperature.

The control module 103 can obtain the first temperature corresponding to the first path, and the second temperature corresponding to the second path, that is, the control module 103 can obtain the temperatures corresponding to multiple paths respectively, and the control module 103 can obtain the temperature corresponding to the multiple positions in the cell. The heat conduction relationship satisfied by the corresponding temperatures respectively obtains the temperature field of the battery cell, and the temperature field may refer to the temperature distribution state of different points in the area of the battery cell. For example, the control module 103 obtains the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions in each battery cell. The heat conduction relationship can be the heat conduction calculation formula satisfied by the temperature values corresponding to the multiple positions respectively. For the details of the heat conduction calculation formula For illustration, please refer to the examples of subsequent embodiments.

Among them, the temperature measurement system 100 can realize accurate measurement of the temperature field of each cell, so that the temperature field of each cell can be obtained by sending an ultrasonic signal through the first ultrasonic transducer, that is, multiple The temperature of each location, thus improving the efficiency of temperature measurement.

In some embodiments of the present application, the control module 103 is also used to obtain the temperature in each cell according to the heat conduction relationship, the first temperature and the second temperature satisfied by the temperatures corresponding to the multiple positions in each cell field, and the temperature field includes: the temperatures corresponding to multiple positions in each cell.

The control module 103 obtains the temperature field in each battery cell according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions in each battery cell, the first temperature and the second temperature, and the temperature field includes: multiple locations in each battery cell The temperature corresponding to each location. For example, the temperature field may include the temperature corresponding to any position in each cell. In the embodiment of the present application, the temperature measurement system 100 can accurately measure the temperature field of each cell, so that the temperature field of each cell can be obtained by sending an ultrasonic signal through the first ultrasonic transducer, that is, The temperature of multiple locations is obtained, thereby improving the efficiency of temperature measurement.

It can be understood that the control module 103 can input the corresponding temperatures on different paths into the preset temperature calculation model, so as to obtain the temperatures of multiple locations, or after the control module 103 obtains the corresponding temperatures on different paths, through Query the preset temperature field relationship table to obtain the temperature of multiple locations. In the embodiment of the present application, there are many ways to realize the specific calculation of the temperature field. The foregoing is an example scenario that can be realized, and is not used to limit the embodiment of the application.

In some embodiments of the present application, there are many ways for the control module 103 to obtain the temperature field in each cell, and an example will be given below. The control module 103 is used to determine the multiple positions in each cell respectively Corresponding heat conduction coefficient; according to the heat conduction coefficients corresponding to multiple positions, obtain the heat conduction relationship satisfied by the temperatures corresponding to multiple positions respectively; take the first temperature and the second temperature as the boundary temperature conditions in each cell, according to multiple positions The heat conduction relationship satisfied by the respective temperatures obtains the temperature field in each cell.

Specifically, based on the principle of heat conduction, the temperature of each position in the cell is different, and the heat will flow from a position with a higher temperature to a position with a lower temperature. This position refers to the position coordinates of the medium in the cell. First, control The module obtains the thermal conductivity coefficients corresponding to multiple positions in each cell, and there is no limitation on the specific values of multiple positions. From the heat conduction (Fourier) law in heat transfer, it can be known that the heat conduction relationship satisfied by the temperatures corresponding to multiple positions can be obtained through the heat conduction coefficients corresponding to multiple positions. For example, the above heat conduction relationship can be the value of each position in multiple positions The heat conduction calculation method that the temperature satisfies. Taking the first temperature and the second temperature as the boundary temperature conditions in each cell, the temperature field in each cell is obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions. For example, with the first temperature corresponding to the first path and the second temperature corresponding to the second path as boundary conditions, the temperature field in each cell can be calculated through the heat conduction calculation method that the temperature of each position in multiple positions satisfies, The temperature field includes temperatures at different locations inside each cell. For example, the temperature at any position in each cell can be measured by the above heat conduction calculation method, and the temperatures at all positions in each cell constitute a temperature field.

In some embodiments of the present application, the first ultrasonic transducer 101 is configured to send a first ultrasonic signal from a first position within a first time period;

The second ultrasonic transducer 102 is configured to receive a first ultrasonic signal from a second position within a first time period;

The second ultrasonic transducer 102 is further configured to send a second ultrasonic signal from a second position within a second time period;

The first ultrasonic transducer 101 is further configured to receive a second ultrasonic signal from the first position within a second time period;

The control module 103 is also used to: obtain the third wave speed of the second ultrasonic signal propagating from the second position to the first position; obtain the third temperature corresponding to the first path according to the third wave speed; wherein, the first time period and the second The time periods are two different temperature measurement time periods.

Specifically, two different temperature measurement time periods are preset, called the first time period and the second time period respectively, and the two time periods are performed in a time-sharing polling manner. For example, in the first time period, the first ultrasonic transducer 101 sends the first ultrasonic signal, and other ultrasonic transducers in each cell except the first ultrasonic transducer 101 receive the first ultrasonic signal, and the control module passes The aforementioned method of temperature measurement obtains the first temperature corresponding to the first path within the first time period. In the second time period, the first ultrasonic transducer 101 is no longer used to send the ultrasonic signal, and the second ultrasonic transducer 102 is used to send the second ultrasonic signal. The other ultrasonic transducers receive the second ultrasonic signal, and the control module obtains the third temperature corresponding to the first path within the second time period through the aforementioned temperature measurement method. Through the above-mentioned time-sharing polling method, the control module can obtain the first temperature and the third temperature measured in different time periods. For example, after the control module 103 obtains the first temperature in the first time period, the control module 103 can report For the first temperature, after the control module 103 acquires the third temperature in the second time period, the control module 103 may report the third temperature. In the embodiment of the present application, multiple temperatures of each battery cell at different times can be acquired to realize real-time measurement of the temperature inside the battery cell.

It should be noted that the control module 103 obtains the first temperature corresponding to the first path within the first time period, and also obtains the third temperature corresponding to the first path within the second time period, then the first temperature and The third temperature corresponds to different moments of the first path, so the embodiments of the present application can realize real-time measurement of the temperature in the battery core.

In some embodiments of the present application, at least one battery cell includes: a plurality of different battery cells, and the time periods for sending and receiving the first ultrasonic signal corresponding to the multiple different battery cells are different time periods.

Specifically, the battery pack includes a plurality of different batteries, and the temperature of different batteries is measured in a time-sharing polling manner. Through the above-mentioned time-sharing polling method, the control module 103 can obtain the temperatures of different batteries at different times, Realize the real-time measurement of the battery core temperature in the battery pack.

In some embodiments of the present application, the temperature measurement system 100 can measure the temperature of each cell multiple times. In the actual application scenario of the battery pack, because there are many ultrasonic transducers in the cell, once each ultrasonic transducer The transducers are constantly testing the temperature, and the result may cause a network storm in the temperature measurement system, resulting in a normal temperature measurement result obtained through a certain ultrasonic signal transmission and reception, but because the result cannot be uploaded, it is misjudged by the system as has a problem. Therefore, the temperature measurement system 100 can select the temperature measurement method of time-sharing polling, and use the control module 103 to poll each ultrasonic transducer to ensure that only one ultrasonic transducer sends ultrasonic signals at the same time, and other ultrasonic transducers perform ultrasonic signals. At the next moment, another ultrasonic transducer is used to send ultrasonic signals to improve the reliability of temperature measurement.

In some embodiments of the present application, the control module 103 is further configured to detect whether at least one of the first ultrasonic transducer 101 and the second ultrasonic transducer 102 is abnormal, so as to obtain a detection result.

Wherein, the control module 103 can also perform anomaly detection on the first ultrasonic transducer 101 and the second ultrasonic transducer 102, thereby determining whether at least one of the first ultrasonic transducer 101 and the second ultrasonic transducer 102 exists exception, improving the reliability and robustness of the temperature measurement system.

In some embodiments of the present application, the control module 103 is also used to detect whether the first ultrasonic transducer 101 and the second ultrasonic transducer 102 are abnormal within the first time period, so as to obtain the first detection result; Whether the first ultrasonic transducer 101 and the second ultrasonic transducer 102 are abnormal within the second time period, so as to obtain the second detection result; determine whether the first ultrasonic transducer 101 or the second ultrasonic transducer 101 or the second detection result Whether there is any abnormality in the second ultrasonic transducer 102.

Among them, the control module 103 can also detect whether the ultrasonic transducer is abnormal, and obtain the detection results, respectively perform abnormal detection in a plurality of different temperature measurement time periods, can obtain multiple detection results, and comprehensively analyze the above multiple detections As a result, it can be determined whether there is an abnormality in the ultrasonic transducer on the cell, for example, abnormality means that the ultrasonic transducer cannot work, for example, the ultrasonic transducer cannot transmit ultrasonic signals, or cannot detect ultrasonic signals. In the embodiment of the present application, abnormality detection is performed on the first ultrasonic transducer 101 and the second ultrasonic transducer 102 within different temperature measurement time periods, so as to determine whether the first ultrasonic transducer 101 or the second ultrasonic transducer 102 Whether there is an abnormality, and improve the reliability and robustness of the temperature measurement system.

In some embodiments of the present application, the control module 103 is further configured to report the first temperature through a wired network or a wireless network.

Wherein, the control module 103 also has a temperature reporting function. After the control module 103 detects the first temperature in at least one battery cell in the battery pack, it can report the first temperature through a wired network or a wireless network. For example, the control module 103 works in the wireless network mode, and the wireless network is a network supporting the Bluetooth wireless transmission protocol, or a network supporting the Green Tooth wireless transmission protocol, or a network of the wireless local area network (wireless fidelity, wifi) protocol, and the first temperature reported is For the upper control system of the battery, as another example, the control module 103 works in a wired network mode, the wired network can be a controller area network (controller area network, CAN) bus, and the first temperature is reported to the upper control system of the battery, so that The upper control system can obtain the first temperature in each cell in real time.

It should be noted that, in the foregoing embodiments of the present application, the temperature measurement of the first cell in the battery pack has been described, but not limited thereto, the battery pack may include multiple cells, such as shown in FIG. 5 In addition to the first cell 201 , the battery pack also includes a second cell 202 , a third cell 203 , and a fourth cell 204 . For example, the second electric core 202 includes a plurality of ultrasonic transducers, and the multiple ultrasonic transducers are respectively connected to the control module 103. Similar to the foregoing embodiments, the control module 103 can also obtain the Temperatures corresponding to multiple paths. Specifically, the control module 103 may obtain the temperature in the first cell 201 and the temperature in the second cell 202 by time-sharing polling. Through the above-mentioned time-sharing polling method, the control module 103 may separately Temperature measurement is performed on different cells to improve the reliability of temperature measurement.

In some embodiments of the present application, the temperature measurement system 100 can obtain the temperature in each cell in real time, and for other cells in the battery pack, the temperature measurement system 100 can also obtain the temperature of other cells in real time. In the actual application scenario of the battery pack, because there are a large number of cells in the battery pack, once each cell is continuously tested for temperature, the result may cause a network storm in the temperature measurement system, resulting in some cells that were originally obtained. The temperature measurement result is normal, but because the result cannot be uploaded, it is misjudged by the system as a problem. Therefore, the temperature measurement system 100 can choose time-sharing polling, poll the state of each cell through the control module 103, ensure that only one cell is measuring the temperature at the same time, and measure the temperature of the other cell at the next time, To improve the reliability of temperature measurement.

It can be seen from the examples of the foregoing embodiments that each cell in the embodiment of the present application can be used as an ultrasonic propagation medium, and the first ultrasonic signal can propagate from the first position to the second position in the cell, and the control module 103 communicates with the first The ultrasonic transducer 101 is connected to the second ultrasonic transducer 102, and the control module 103 can obtain the first wave velocity of the first ultrasonic signal propagating on the first path. Since the temperature of the battery core is directly related to the wave velocity of the ultrasonic signal, According to the first wave speed, the first temperature corresponding to the first path can be obtained, and the first temperature can be used as the current temperature in each cell, which can accurately measure the temperature of at least one cell in the battery pack, reducing the complexity of temperature measurement Spend.

In order to facilitate a better understanding and implementation of the above-mentioned solutions in the embodiments of the present application, the corresponding application scenarios are exemplified below for specific description.

In the embodiment of the present application, the thermal runaway of the battery pack is often caused by the spread of heat inside the entire battery pack due to a problem with a single battery cell. Therefore, it is very important to accurately measure the temperature of a single cell. Taking a battery pack with multiple cells as an example, the temperature measurement system provided in the embodiment of the present application can acquire the temperature of each cell. Furthermore, the temperature field of each cell can also be obtained.

The temperature measurement system provided in the embodiment of the present application includes multiple ultrasonic transducers and control modules. For example, multiple ultrasonic transducers can be installed on one battery cell. The ultrasonic transducer in the embodiment of the present application can perform ultrasonic speed measurement based on a solid medium, and the control module can obtain the temperature measurement result of the battery pack, so that the battery cell can be accurately measured. temperature. Through the ultrasonic transducer and the control module, the temperature of different paths on a single cell can be obtained. Based on the principle of heat conduction, the temperature of the corresponding position of the cell can be calculated, and then the temperature field of the cell can be obtained, and the internal temperature of the cell can be determined through the temperature field. distributed. In the embodiment of the present application, the control module can accurately obtain the temperature of the battery cell, which can ensure the safety of the battery pack.

In the embodiment of the present application, the temperature measurement system is used to measure the temperature of the battery cells in the battery pack. As shown in FIG. 5 , the battery pack includes four battery cells, namely a first battery cell 201 , a second battery cell 202 , a third battery cell 203 and a fourth battery cell 203 . Multiple ultrasonic transducers can be arranged on each battery cell, and the multiple ultrasonic transducers are respectively connected to the control module 103 through connecting wires. Multiple ultrasonic transducers are arranged on each cell to send and receive ultrasonic signals. By measuring the ultrasonic sound velocity on different paths, the temperature inside the cell can be obtained. Based on the average temperature on different paths, the internal temperature of the cell can be obtained based on the principle of heat conduction. temperature field. For example, in Fig. 5, a plurality of ultrasonic transducers are set on the first electric core 201 as an example for illustration, and the first ultrasonic transducer 101, the second ultrasonic transducer 101, and the second ultrasonic transducer can be arranged on multiple surfaces of the first electric core 201. 102 . The third ultrasonic transducer 104 .

The temperature measurement of the first battery cell in the subsequent embodiments is taken as an example. As shown in FIG. 6 , four ultrasonic transducers can be arranged on one cell, which are ultrasonic transducer 1 , ultrasonic transducer 2 , ultrasonic transducer 3 , and ultrasonic transducer 4 . Wherein, the ultrasonic transducer 1 and the ultrasonic transducer 2 are arranged on one side, the ultrasonic transducer 3 and the ultrasonic transducer 4 are arranged on one side, and the ultrasonic transducer 1 can be the first one in the aforementioned embodiments. The ultrasonic transducer 101 and the ultrasonic transducer 3 may be the second ultrasonic transducer 102 in the aforementioned embodiments, and the ultrasonic transducer 2 may be the aforementioned third ultrasonic transducer 104 . The path length between ultrasonic transducer 1 and ultrasonic transducer 2 can be 5 centimeters (cm), the path length between ultrasonic transducer 1 and ultrasonic transducer 3 can be 14.6cm, ultrasonic transducer 1 1. The path length between the ultrasonic transducers 4 may be 15.5 cm.

For example, the arrangement of ultrasonic transducers in the temperature measurement system is shown in Figure 6. Ultrasonic transducers are placed at

positions

1, 2, 3, and 4 of the cell, and each ultrasonic transducer can be used as a transceiver device, that is, each ultrasonic transducer can send ultrasonic signals or receive ultrasonic signals. It is not limited, in another implementation scenario, some ultrasonic transducers can be used for sending ultrasonic signals, but not for receiving ultrasonic signals, and some ultrasonic transducers can be used for receiving ultrasonic signals, but not for sending ultrasonic waves Signal, this embodiment does not limit whether the ultrasonic transducer can have two kinds of capabilities of sending and receiving. In the embodiment of the present application, more ultrasonic transducers can also be arranged on one cell to measure the average temperature on different paths. In the embodiment of the present application, multiple ultrasonic transducers are arranged on the same cell, which can make The constructed temperature field is divided into more detailed regions, so that a more accurate temperature field can be obtained.

It should be noted that, in the embodiment of this application, for the same cell, one ultrasonic transducer is used to send ultrasonic signals, and the rest of the ultrasonic transducers are used to receive ultrasonic signals. Whether each ultrasonic transducer is used for sending or receiving Ultrasonic signals need to be controlled by the control module for different sending and receiving situations.

In the embodiment of the present application, the ultrasonic signal can propagate in the electric core, and the electric core can be used as an infinite solid medium. The wave speed of the longitudinal wave and the transverse wave of the ultrasonic signal in the infinite solid medium are shown in the following formulas (1) and (2). For example, the wave velocity c _L of a longitudinal wave propagating in an infinite solid medium is:

where E is the modulus of elasticity, v is Poisson's ratio, and ρ is the density of the solid medium. For example, the modulus of elasticity refers to the direction of tension and is generally used to calculate tensile stress.

The wave speed c _T of the transverse wave propagating in the infinite solid medium is:

where E is the modulus of elasticity, v is Poisson's ratio, ρ is the density of the solid medium, and G is the shear modulus. For example, shear modulus refers to the shear direction and is used to calculate shear force.

It can be seen from the above formula that in a solid medium, the wave velocity of the ultrasonic signal is related to the density and elastic modulus of the medium, and the wave velocity of different media is different; the greater the elastic modulus of the medium and the smaller the density, the faster the wave velocity of the ultrasonic signal ; while the temperature will directly affect the elastic modulus and density of the medium, and then affect the wave velocity of the ultrasonic signal. Therefore, the current temperature of the battery core can be reflected by the wave velocity of the ultrasonic signal.

As shown in Figure 6, four ultrasonic transducers are installed on one cell, and the ultrasonic transducers 1-4 adopt the time-sharing polling mode, that is, at different times, the ultrasonic transducers can be configured by the control module. Different transceiver functions can save the cost of the temperature measurement system and improve the reliability of the temperature measurement system. For example, at the following four moments: moment 1, moment 2, moment 3, moment 4:

At time 1, ultrasonic transducer 1 transmits ultrasonic signals, and ultrasonic transducers 2/3/4 receive ultrasonic signals;

At time 2, the ultrasonic transducer 2 transmits the ultrasonic signal, and the ultrasonic transducer 4/1/3 receives the ultrasonic signal;

At time 3, the ultrasonic transducer 3 transmits an ultrasonic signal, and the ultrasonic transducer 2/1/4 receives the ultrasonic signal;

At time 4, the ultrasonic transducer 4 transmits an ultrasonic signal, and the ultrasonic transducer 3/1/2 receives the ultrasonic signal.

Among them, assuming that the ultrasonic transducer 3 is damaged, then at time 1/2/4, the result of the ultrasonic signal detected by the ultrasonic transducer 3 may be abnormal, and at time 3, the result of the ultrasonic transducer 2/1/4 detecting the ultrasonic signal The results are all abnormal. Based on the above situation and comprehensive judgment, it can be judged whether there is an abnormality in the ultrasonic transducer 3. In this way, it is also helpful to increase the reliability and robustness of the system from the system level.

In addition, through the temperature measurement on different paths, the temperature of different positions inside the battery core can be obtained, so as to avoid the thermal runaway caused by the failure of timely warning due to the high local temperature of the battery core and the low temperature in other positions due to the problem of heat conduction. question.

In the actual application scenario of the temperature measurement system, because there are a large number of cells, once each cell is continuously tested, the result may cause a network storm in the system, resulting in the normal temperature measurement results of some cells. , but the system misjudged it as a problem because the result could not be uploaded. In the embodiment of the present application, the transmission and reception of ultrasonic signals by a plurality of ultrasonic transducers can choose the time-sharing polling method, and use the control module to poll the status of each battery cell to ensure that there is only one ultrasonic signal in the network at the same time. Sending and receiving, thereby improving the reliability of the temperature measurement system.

The temperature measurement system provided in the embodiment of the present application can be specifically applied to the chip on the battery cell and related circuits, or to the on-board battery of the electric vehicle and the battery of the energy storage station.

As shown in Figure 7 and Figure 8, taking 4 ultrasonic transducers on one cell as an example, ultrasonic transducers 1-4 adopt the working mode of time-sharing polling, for example, ultrasonic transducer 1 sends ultrasonic signals, The ultrasonic transducers 2-4 receive ultrasonic signals, that is, the ultrasonic transducers can undertake different sending and receiving functions through the configuration of the control module at different times, saving the cost of the temperature measurement system and improving the reliability of the system.

Specifically, the temperature measurement process performed by the temperature measurement system specifically includes the following steps:

S01. The ultrasonic transducer 1 sends an ultrasonic signal, and the ultrasonic transducer 2, the ultrasonic transducer 3, and the ultrasonic transducer 4 receive the ultrasonic signal.

S02. The ultrasonic signal is transmitted to different receiving devices through the interior of the battery. The arrival time of the ultrasonic signal is related to the wave speed, and the wave speed of the ultrasonic signal on different paths can be calculated.

S03. The propagation speed of ultrasonic signals in different materials is related to the basic parameters such as the density, elastic modulus and temperature of the materials. When the battery material remains unchanged, the density and elastic modulus are approximately unchanged, and the relationship between the wave velocity and temperature of the ultrasonic signal can be calibrated. As shown in FIG. 8 , keep the condition that the ultrasonic transducer 1 transmits the ultrasonic signal and the ultrasonic transducer 3 receives the ultrasonic signal, and the wave velocity at different temperatures is measured. For example, based on the least squares method, the temperature curve of the measured cell is fitted, for example: T=f(V), where T is the temperature of the measured cell, V is the current ultrasonic wave velocity, and f is the fitted The function. It should be noted that the above-mentioned least squares method is an example, and is not intended to limit the embodiment of the present application. Other high-order fitting methods can also be used to obtain more accurate temperature measurement results, which will not be repeated here.

S04. Based on the relationship between the temperature and the wave velocity obtained in step S03, average temperatures on the 1->3 path, 1->4 path, and 1->2 path can be respectively obtained.

For example, the path 1->3 indicates the propagation path between the ultrasonic transducer 1 and the ultrasonic transducer 3, and the meanings of other paths are similar, and will not be described one by one here.

The average temperatures on S05, 1->3 path, 1->4 path, and 1->2 path are T ₁₃ , T ₁₄ , and T ₁₂ respectively. The temperatures on these three paths are the three boundaries of the internal temperature of the battery cell condition.

S06. Based on the principle of heat conduction, the temperature in each part of the cell is different, and the heat will flow from a point with a higher temperature to a point with a lower temperature. Let u(x, y, z, t) be a certain point in the cell (x , y, z) at time t, let k(x, y, z) be the thermal conductivity coefficient of the object at point (x, y, z), k(x, y, z) is a positive value, according to the The law of heat conduction (Fourier) in heat, the medium flows through an infinitely small area dS along the normal direction n in the infinitely small period dt, and the directional derivative of the medium temperature along the normal direction of the surface dS

It is directly proportional, that is, the following relationship is satisfied:

Through integral transformation, the following heat conduction equation (3) can be obtained:

Wherein, a=k/(b*q), k, b, q are all constants.

Based on the boundary conditions u ₁ (x ₁ ,y ₁ ,z ₁ ,t)=T ₁₃ , u ₂ (x ₂ ,y ₂ ,z ₂ ,t)=T ₁₄ , u ₃ (x ₃ ,y ₃ ,z ₃ ,t)=T ₁₂ , through the boundary conditions and the heat conduction equation, the temperature of different points inside the cell can be solved.

The embodiment of the present application can measure the temperature of any point on the battery cell, and use the above heat conduction calculation method to fit the temperature at different positions of the battery cell.

An example is shown as follows, as shown in Figure 8, the temperature at nodes inside different boundaries is calculated using the finite element method, assuming that when dividing the grid, there are c points in the X-axis direction and r points in the Y-axis direction. At this time, the boundary conditions are:

T ₀ (x, y) = T ₁₂ , T ₁ (x, y) = T ₁₃ (4)

T _ij is the temperature at the intersection of point i on the X-axis and point j on the Y-axis. Since the temperature at the same point is the same, it satisfies the following relationship:

T _(j-1)*c+i-1 ＝T _ij (5)

Based on the heat conduction coefficient, the heat conduction equation and the corresponding boundary conditions, the temperature of each node after grid division on the path connecting the two ultrasonic transducers on the cell can be obtained. It should be noted that the division of the grid thickness in Fig. 8 can directly affect the fineness of the temperature field distribution, and can be set according to requirements, which is not limited here.

In summary, due to the different wave speeds of ultrasonic waves at different temperatures, the average temperature on different paths of the cell can be calculated based on the ultrasonic wave speeds on different paths, and based on the heat conduction principle and the boundary conditions determined by the temperature on different paths, it can be inferred that the current The temperature field inside the cell.

S07. In the temperature measurement system as shown in FIG. 5 , the transmitting and receiving function of the ultrasonic transducer can be adjusted through the control function of the control module. Wherein, the ultrasonic transducer 4 is used as a transmitting ultrasonic device, and the ultrasonic transducer 1, the ultrasonic transducer 2, and the ultrasonic transducer 3 are used as receiving devices.

S08. Switch the working mode of the ultrasonic transducer in turn, obtain the temperature on different paths through the control module, and obtain the temperature field inside the cell through integral calculation.

It should be noted that, in the foregoing embodiments of the present application, the case of four ultrasonic transducers is described, and the embodiments of the present application can also increase or decrease the number of ultrasonic transducers according to the actual application scenarios of the battery cells.

In the embodiment of the present application, it involves ultrasonic transducers, switching and control circuit design, the corresponding relationship between the wave velocity and temperature of ultrasonic signals, and the temperature field distribution measurement algorithm. According to the functions, the modules included in the temperature measurement system can be obtained, as shown in Figure 9, for example, The temperature measurement system includes: a power supply unit (unit), an ultrasonic sending unit, an ultrasonic receiving unit, an information reporting unit, a computing unit and a control unit. Wherein, the ultrasonic sending unit and the ultrasonic receiving unit correspond to the aforementioned ultrasonic transducers, the function of the computing unit and the function of the control unit can be described as the function of the aforementioned control module, that is, the control module can include a computing unit and a control unit, where I won't explain them one by one. Without limitation, the control modules in the foregoing embodiments may be implemented by software or hardware or a combination of both. As another example, the control module in the foregoing embodiments is specifically the processor 1101 in the subsequent FIG. 11 .

Among them, the power supply unit is used to supply power and sequence control to each module in the temperature measurement system;

The ultrasonic sending unit and the ultrasonic receiving unit are used as ultrasonic transducers, responsible for the sending and receiving of ultrasonic signals, which involves analog-to-digital and digital-to-analog conversion;

The control unit is used for switching between sending and receiving of the ultrasonic transducer;

A calculation unit, used for calculating the temperature field of the battery cell;

The information reporting unit is used to report the responsible temperature measurement results, which can be reported through wired network or wireless network mode.

The temperature measurement system provided in the embodiment of the present application can fully realize the functions of temperature detection and information reporting of the battery.

The temperature measurement system provided in the embodiment of the present application can realize accurate measurement of the temperature field of the battery cell. Based on the solid ultrasonic to measure the temperature of the cell in the battery, based on the principle of ultrasonic propagation, the temperature inside the cell is determined by the wave velocity of the ultrasonic signal. The embodiment of the present application realizes the temperature measurement of the battery cell based on one send, multiple receive and multiple paths. Through the control design of the control module, the time-sharing polling of the ultrasonic transducer is realized, and the temperature of the multiple paths inside the battery is obtained, and then the battery cell is established. internal temperature field. The embodiment of the present application is based on the time-division multiplexing measurement of the ultrasonic transducer, which can realize high utilization rate of the ultrasonic transducer and realize time-division reporting and query of the temperature measurement result.

It can be known from the foregoing examples that the embodiment of the present application can accurately measure the temperature inside the battery cell. The temperature information on multiple paths can be obtained through the ultrasonic transducers installed at different positions of the cell, and the temperature field inside the cell can be obtained by polling. The embodiment of the present application can detect the temperature change inside the battery in real time at low cost. When the battery is abnormal, it can quickly feedback and give an alarm to protect the life of the user. At the same time, the embodiment of the present application has the advantages of wide measurement range, low cost, large monitoring area, good real-time performance, and simple connection mode.

In the embodiment of this application, based on the influence of the propagation characteristics of ultrasonic waves in solids by the state of materials (such as shear modulus, pores, density, etc.), the multi-signal fusion system based on ultrasonic, temperature, pressure, voltage and current can collect multiple Such a signal, the system can be applied to a material condition monitoring system like a battery.

In addition to providing the aforementioned temperature measurement system, the embodiment of the present application also provides a temperature measurement method. As shown in Figure 10, the temperature measurement method is used to measure the temperature of at least one cell in the battery pack, the first position on each cell is provided with a first ultrasonic transducer, and the second position on each cell is provided with There is a second ultrasonic transducer. Optionally, the first position and the second position are on different surfaces of each cell. The method provided in the embodiment of the present application includes the following steps:

1001. Send a first ultrasonic signal from a first position through a first ultrasonic transducer;

1002. Receive a first ultrasonic signal from a second position by using a second ultrasonic transducer;

1003. Obtain a first wave velocity at which the first ultrasonic signal propagates from the first position to the second position;

1004. Obtain the first temperature corresponding to the first path in each cell according to the first wave velocity, where the first path is the ultrasonic propagation path between the first position and the second position in each cell

In some embodiments of the present application, a third ultrasonic transducer is provided at a third position on each cell. Optionally, the third position and the first position are on the same surface or different surfaces of each cell. The method provided in the embodiment of the present application also includes:

receiving a first ultrasonic signal from a third location via a third ultrasonic transducer;

The second temperature corresponding to the second path in each cell is obtained according to the second wave velocity, and the second path is an ultrasonic propagation path between the first position and the third position in each cell.

In some embodiments of the present application, the method also includes:

The temperature field in each cell is obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions in each cell, the first temperature and the second temperature. The temperature field includes: the multiple positions in each cell are respectively corresponding temperature.

In some embodiments of the present application, the temperature field in each cell is obtained according to the heat conduction relationship, the first temperature, and the second temperature satisfied by the temperatures corresponding to the multiple positions in each cell, including:

Determine the thermal conductivity coefficients corresponding to multiple positions in each cell;

According to the heat conduction coefficients corresponding to the multiple positions, the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions is obtained;

Taking the first temperature and the second temperature as the boundary temperature conditions in each cell, the temperature field in each cell is obtained according to the heat conduction relationship satisfied by the temperatures corresponding to the multiple positions.

In some embodiments of the present application, the sending the first ultrasonic signal from the first position through the first ultrasonic transducer includes: sending the first ultrasonic signal from the first position within a first time period through the first ultrasonic transducer the first location sends the first ultrasonic signal;

The method also includes:

In some embodiments of the present application, the at least one battery cell includes: a plurality of different battery cells, and the time periods for sending and receiving the first ultrasonic signal corresponding to the multiple different battery cells are different time periods.

In some embodiments of the present application, whether at least one of the first ultrasonic transducer and the second ultrasonic transducer is abnormal is detected to obtain a detection result.

In some embodiments of the present application, the method provided in the embodiment of the present application further includes:

Detect whether the first ultrasonic transducer and the second ultrasonic transducer are abnormal within the first time period, so as to obtain the first detection result;

Detect whether the first ultrasonic transducer and the second ultrasonic transducer are abnormal within a second time period, so as to obtain a second detection result;

Whether the first ultrasonic transducer or the second ultrasonic transducer is abnormal is determined according to the first detection result and the second detection result.

It can be seen from the examples of the foregoing embodiments that each cell in the embodiments of the present application can be used as an ultrasonic propagation medium, the first ultrasonic signal can propagate from the first position to the second position in the cell, and the control module is connected with the first ultrasonic wave respectively. The transducer is connected to the second ultrasonic transducer, and the control module can obtain the first wave velocity of the first ultrasonic signal propagating on the first path. Since the temperature of the battery core is directly related to the wave velocity of the ultrasonic signal, according to the first The wave speed can obtain the first temperature corresponding to the first path, and the first temperature can be used as the current temperature in each cell, which can accurately measure the temperature of at least one cell in the battery pack and reduce the complexity of temperature measurement.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because of this application, certain steps are performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

As shown in FIG. 11 , it is a schematic diagram of the hardware structure of the device provided by the embodiment of the present application. The device can be the temperature measuring system shown in Fig. 1, Fig. 2 to Fig. 4 .

The device shown in FIG. 11 may include: a processor 1101 , a memory 202 , a communication interface 1104 , multiple ultrasonic transducers 1105 and a bus 1103 . The processor 1101 , memory 1102 , communication interface 1104 , and multiple ultrasonic transducers 1105 may be connected through a bus 1103 .

The processor 1101 is the control center of the computer device, and may be a general-purpose central processing unit (central processing unit, CPU), or other general-purpose processors. Wherein, the general-purpose processor may be a microprocessor or any conventional processor.

As an example, the processor 1101 may include one or more CPUs.

Without limitation, the processor 1101 in FIG. 11 may specifically be the control module 103 in the foregoing embodiments, and the functions of the processor 1101 may be the functions of the control module 103 . For example, the processor 1101 may execute the temperature measurement method described above in FIG. 10 .

The memory 1102 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (random access memory, RAM) or other types that can store information and instructions The dynamic storage device can also be an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a magnetic disk storage medium or other magnetic storage device, or can be used to carry or store instructions or data structures. desired program code and any other medium that can be accessed by a computer, but is not limited thereto.

In a possible implementation manner, the memory 1102 may exist independently of the processor 1101 . The memory 1102 may be connected to the processor 1101 through the bus 1103 and used for storing data, instructions or program codes. When the processor 1101 invokes and executes the instructions or program codes stored in the memory 1102, it can realize the temperature measurement method provided by the embodiment of the present application.

In another possible implementation manner, the memory 1102 may also be integrated with the processor 1101 .

The communication interface 1104 is used to connect the device with other devices through a communication network, and the communication network may be Ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc. The communication interface 1104 may include a receiving unit for receiving data, and a sending unit for sending data. For example, the communication interface 1104 is used for connecting the processor 1101 with an ultrasonic transducer.

The bus 1103 may be an industry standard architecture (industry standard architecture, ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (extended industry standard architecture, EISA) bus, etc. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 11 , but it does not mean that there is only one bus or one type of bus.

The functions of the plurality of ultrasonic transducers 1105 are as described for the first ultrasonic transducer 101 and the second ultrasonic transducer 102 in the foregoing embodiments, and will not be repeated here.

It should be noted that the structure shown in FIG. 11 does not constitute a limitation to the computer equipment. Except for the components shown in FIG. 11, the computer equipment may include more or less components than those shown in the illustration, or combine some components , or different component arrangements.

The foregoing describes the solutions provided by the embodiments of the present application from the perspective of methods. In order to realize the above functions, it includes corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may implement the described functionality using different methods for each particular application, but such implementation should not be considered as exceeding the scope of the present application.

In some embodiments, the disclosed methods can be implemented as computer program instructions encoded in a machine-readable format on a computer-readable storage medium or on other non-transitory media or articles of manufacture.

It should be understood that the arrangements described herein are for example purposes only. Accordingly, those skilled in the art will understand that other arrangements and other elements (eg, machines, interfaces, functions, sequences, and groups of functions, etc.) can be used instead, and some elements may be omitted altogether depending on the desired result. .

In addition, many of the described elements are functional entities that may be implemented as discrete or distributed components, or implemented in conjunction with other components in any suitable combination and location.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When computer-executed instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. A computer can be a general purpose computer, special purpose computer, computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g. Coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or may contain one or more data storage devices such as servers and data centers that can be integrated with the medium. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)), etc.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A temperature measurement system, characterized in that the temperature measurement system is used to measure the temperature of at least one cell in a battery pack, and the temperature measurement system includes: a first ultrasonic transducer, a second ultrasonic transducer and a control module, where

The first ultrasonic transducer and the second ultrasonic transducer are respectively connected to the control module; the first ultrasonic transducer is arranged on each electric core in the at least one electric core The first position, the second ultrasonic transducer is arranged at the second position on each battery cell;

the first ultrasonic transducer, configured to transmit a first ultrasonic signal from the first location;

the second ultrasonic transducer for receiving the first ultrasonic signal from the second location;

The control module is configured to obtain a first wave speed at which the first ultrasonic signal propagates from the first position to the second position; obtain a first path in each cell according to the first wave speed corresponding to the first temperature, wherein the first path is an ultrasonic propagation path between the first position and the second position.
The temperature measurement system according to claim 1, wherein the temperature measurement system further comprises: a third ultrasonic transducer, wherein,

The third ultrasonic transducer is connected to the control module, and the third ultrasonic transducer is arranged at a third position on each battery cell;

the third ultrasonic transducer, configured to receive the first ultrasonic signal from the third location;

The control module is further configured to: obtain a second wave speed at which the first ultrasonic signal propagates from the first position to the third position; obtain the second wave speed in each cell according to the second wave speed The second temperature corresponds to the two paths, and the second path is an ultrasonic propagation path between the first position and the third position.
The temperature measurement system according to claim 2, wherein the control module is further configured to: obtain the temperature field in each battery cell according to the first temperature and the second temperature, the The temperature field includes: temperatures respectively corresponding to multiple positions in each cell.
The temperature measurement system according to any one of claims 1 to 3, wherein the first ultrasonic transducer is configured to transmit the first ultrasonic wave from the first position within a first time period signal; the second ultrasonic transducer configured to receive the first ultrasonic signal from the second location during the first time period;

The second ultrasonic transducer is also used to send a second ultrasonic signal from the second position within a second time period; the first ultrasonic transducer is also used to transmit a second ultrasonic signal within the second time period receiving the second ultrasonic signal from the first location;

The control module is further configured to: acquire a third wave velocity of the second ultrasonic signal propagating from the second position to the first position; acquire a third wave velocity corresponding to the first path according to the third wave velocity temperature;

Wherein, the first time period and the second time period are two different temperature measurement time periods.
The temperature measurement system according to any one of claims 1 to 4, wherein the at least one battery cell includes: a plurality of different battery cells, and the plurality of different battery cells are correspondingly used to send and receive the first The time periods of an ultrasonic signal are different time periods.
The temperature measuring system according to any one of claims 1 to 5, wherein the control module is further configured to detect at least one of the first ultrasonic transducer and the second ultrasonic transducer Whether one is abnormal to get the detection result.
A temperature measurement method, characterized in that the temperature measurement method is used to measure the temperature of at least one cell in a battery pack, and a first ultrasonic transducer is provided at a first position on each cell in the at least one cell transducer, the second position on each cell is provided with a second ultrasonic transducer; the method includes:

sending a first ultrasonic signal from the first location through the first ultrasonic transducer;

receiving the first ultrasonic signal from the second location via the second ultrasonic transducer;

acquiring a first wave velocity at which the first ultrasonic signal propagates from the first position to the second position;

Acquiring a first temperature corresponding to a first path in each cell according to the first wave velocity, wherein the first path is an ultrasonic propagation path between the first position and the second position.
The temperature measuring method according to claim 7, wherein a third ultrasonic transducer is provided at a third position on each battery cell, and the method further comprises:

receiving the first ultrasonic signal from the third location via the third ultrasonic transducer;

acquiring a second wave velocity of the first ultrasonic signal propagating from the first position to the third position;

Acquiring a second temperature corresponding to a second path in each cell according to the second wave velocity, the second path being an ultrasonic propagation path between the first position and the third position.
The method according to claim 8, characterized in that the method further comprises:

Acquiring a temperature field in each battery cell according to the first temperature and the second temperature, where the temperature field includes: temperatures respectively corresponding to multiple positions in each battery cell.
The temperature measuring method according to any one of claims 7 to 9, wherein the sending the first ultrasonic signal from the first position through the first ultrasonic transducer comprises: passing the first ultrasonic signal through the first ultrasonic transducer an ultrasonic transducer transmitting said first ultrasonic signal from said first location during a first period of time;

The receiving the first ultrasonic signal from the second location through the second ultrasonic transducer includes: receiving the first ultrasonic signal from the second location within the first time period through the second ultrasonic transducer receiving the first ultrasonic signal;

The obtaining the first wave speed of the first ultrasonic signal propagating from the first position to the second position includes: obtaining the first wave speed of the first ultrasonic signal within the first time period ;

The obtaining the first temperature corresponding to the first path in each battery cell according to the first wave speed includes: obtaining the temperature corresponding to the first path within the first time period according to the first wave speed. said first temperature;

The method also includes:

sending a second ultrasonic signal from the second location through the second ultrasonic transducer for a second period of time;

receiving the second ultrasonic signal from the first location by the first ultrasonic transducer during the second time period;

acquiring a third wave velocity of the second ultrasonic signal propagating from the second position to the first position within the second time period;

acquiring a third temperature corresponding to the first path within the second time period according to the third wave velocity;

Wherein, the first time period and the second time period are two different temperature measurement time periods.
The temperature measuring method according to any one of claims 7 to 10, characterized in that the at least one cell includes: a plurality of different cells, and the plurality of different cells are correspondingly used to send and receive the first The time periods of an ultrasonic signal are different time periods.
The temperature measuring method according to any one of claims 7 to 11, wherein the method also includes:

Detecting whether at least one of the first ultrasonic transducer and the second ultrasonic transducer is abnormal, so as to obtain a detection result.
A terminal device, characterized in that the terminal device includes: a processor and a memory; the processor and the memory communicate with each other;

The memory is used to store instructions;

The processor is configured to execute the instructions in the memory, and execute the method according to any one of claims 7 to 12.
A computer-readable storage medium, including instructions, which, when run on a computer, cause the computer to execute the method according to any one of claims 7-12.
A computer program product comprising instructions, when run on a computer, causes the computer to execute the method according to any one of claims 7-12.