Vehicle and electrochemical impedance spectroscopy detection method

Abstract

The embodiment of the invention discloses a vehicle and an electrochemical impedance spectroscopy detection method, and belongs to the technical field of vehicles, the vehicle comprises a battery module and a battery management system, the battery management system is connected with the battery module, the battery management system is used for controlling the battery module to be in an impedance parameter measurement mode, and the battery module is connected with the battery management system. The working current of the battery module in the impedance parameter measurement mode is a target excitation current; and when the battery module is in the impedance parameter measurement mode, detecting a target voltage of the battery module, and obtaining an impedance parameter of the battery module according to the target excitation current and the target voltage. According to the invention, the battery management system in the vehicle can conveniently obtain the impedance parameter of the battery module in real time, so that the monitoring capability of the battery management system on the battery module is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle technology, and relate to but are not limited to a vehicle and an electrochemical impedance spectroscopy detection method. Background Art

[0002] With the rapid development of new energy technologies, electric vehicles have become widely popular. Electric vehicles are generally equipped with power batteries as core components to provide power for the electric vehicles. The performance of the power batteries directly affects the performance of the electric vehicles, which in turn affects the user experience.

[0003] In the related technology, the related technicians generally also set up a battery management system (BMS) in the electric vehicle, and the BMS monitors the power battery in the electric vehicle. For example, a voltage sensor, a current sensor and a temperature sensor connected to the BMS can be set for the power battery, so that the BMS can obtain various electrical parameters of the power battery in real time.

[0004] However, parameters such as the impedance characteristics of the battery during use are also very important. However, due to the complexity of EIS detection, the impedance characteristics of the battery can generally only be obtained by performing EIS detection on the battery in a laboratory environment. Therefore, the solutions in the relevant technology have the problem of being unable to detect the impedance characteristics of the power battery in the vehicle in real time and conveniently. Summary of the invention

[0005] In view of this, the vehicle and electrochemical impedance spectroscopy detection method provided in the embodiment of the present application can enable the battery management system in the vehicle to obtain the impedance parameters of the battery module in real time and conveniently, thereby improving the monitoring ability of the battery management system on the battery module. The vehicle and electrochemical impedance spectroscopy detection method provided in the embodiment of the present application is implemented as follows:

[0006] In one aspect of an embodiment of the present application, a vehicle is provided, the vehicle comprising: a battery module and a BMS, the BMS being connected to the battery module, wherein:

[0007] The BMS is used to control the battery module to be in an impedance parameter measurement mode, and the working current of the battery module in the impedance parameter measurement mode is a target excitation current;

[0008] And, when the battery module is in the impedance parameter measurement mode, the target voltage of the battery module is detected, and the impedance parameter of the battery module is obtained according to the target excitation current and the target voltage.

[0009] Optionally, the vehicle further comprises: a target power-consuming device, wherein the target power-consuming device is connected to the battery module and the BMS respectively, wherein:

[0010] The BMS is further configured to output a first control instruction to the target electrical device;

[0011] The target electrical device is configured to be in a target operating state in response to the first control instruction, wherein when the target electrical device is in the target operating state, the battery module is in the impedance parameter measurement mode.

[0012] Optionally, the first control instruction includes a target operating parameter;

[0013] The target electrical device is further configured to adjust a current operating parameter to the target operating parameter in response to the first control instruction, so that the target electrical device is in the target operating state.

[0014] Optionally, the target electrical device is a high-voltage controller in the vehicle, and the high-voltage controller is used to supply power to a first electrical device in the vehicle, and an operating voltage of the first electrical device is greater than or equal to a first threshold;

[0015] Alternatively, the target electrical device is a low-voltage converter in the vehicle, and the low-voltage converter supplies power to a second electrical device in the vehicle, wherein an operating voltage of the second electrical device is less than or equal to a second threshold.

[0016] Optionally, the vehicle further includes an on-board charger (OBC), and the OBC is connected to the battery module and the BMS respectively; wherein,

[0017] The BMS is further configured to output a second control instruction to the OBC;

[0018] The OBC is used to output the target excitation current to the battery module in response to the second control instruction, so that the battery module is in the impedance parameter measurement mode.

[0019] Optionally, the second control instruction also includes a target current parameter, where the target current parameter is a parameter for controlling the OBC to output the target excitation current.

[0020] Optionally, the battery module includes: a first battery pack, a second battery pack and a DC-to-DC converter (DC-to-DC converter, referred to as DCDC);

[0021] The first battery pack is connected to the first end of the DCDC, the second battery pack is connected to the second end of the DCDC; the DCDC is connected to the BMS; wherein,

[0022] The BMS is further configured to output a third control instruction to the DCDC;

[0023] The DCDC is used to adjust the voltage of the first end and the voltage of the second end of the DCDC in response to the third control instruction, so that the first battery group outputs the target excitation current to the second battery group, or so that the second battery group outputs the target excitation current to the first battery group, so that the battery module is in the impedance parameter measurement mode.

[0024] Optionally, the third control instruction further includes a voltage adjustment parameter, and the voltage adjustment parameter includes an adjustment voltage and an adjustment frequency;

[0025] The DCDC is also used to respond to the third control instruction and adjust the voltage of the first end and the voltage of the second end of the DCDC according to the voltage adjustment parameter;

[0026] The first battery pack is used for outputting the target excitation current to the second battery pack through the DCDC when the voltage at the first end of the DCDC is greater than the voltage at the second end;

[0027] The second battery pack is used for outputting the target excitation current to the first battery pack through the DCDC when the voltage of the second terminal of the DCDC is greater than the voltage of the first terminal.

[0028] Another aspect of the embodiment of the present application further provides an electrochemical impedance spectroscopy detection method, which is applied to the above-mentioned vehicle, and the method includes:

[0029] The BMS controls the battery module to be in an impedance parameter test mode, and the working current of the battery module in the impedance parameter measurement mode is a target excitation current;

[0030] When the battery module is in the impedance parameter measurement mode, detecting a target voltage of the battery module by the BMS;

[0031] The BMS obtains the impedance parameter of the battery module according to the target excitation current and the target voltage.

[0032] Optionally, when the vehicle further includes a target power-consuming device, and the target power-consuming device is respectively connected to the battery module and the BMS, the BMS controls the battery module to be in an impedance parameter test mode, including:

[0033] Outputting a first control instruction by the BMS to the target electrical device;

[0034] The target electrical device is in a target operating state in response to the first control instruction;

[0035] Wherein, when the target electrical device is in the target operating state, the battery module is in the impedance parameter measurement mode.

[0036] Optionally, when the vehicle further includes an OBC, and the OBC is connected to the battery module and the BMS respectively, the BMS controls the battery module to be in an impedance parameter test mode, including:

[0037] Outputting a second control instruction from the BMS to the OBC;

[0038] In response to the second control instruction, the OBC outputs the target excitation current to the battery module, so that the battery module is in the impedance parameter measurement mode.

[0039] Optionally, when the battery module includes a first battery pack, a second battery pack and a DCDC, and the DCDC is connected to the BMS, the BMS controls the battery module to be in an impedance parameter test mode, including:

[0040] The BMS outputs a third control instruction to the battery module;

[0041] The DCDC adjusts the voltage at the first end and the voltage at the second end of the DCDC in response to the third control instruction, so that the first battery group outputs the target excitation current to the second battery group through the DCDC, or so that the second battery group outputs the target excitation current to the first battery group, so that the battery module is in the impedance parameter measurement mode.

[0042] The computer-readable storage medium provided in the embodiment of the present application has a computer program stored thereon, and when the computer program is executed by a processor, the method provided in the embodiment of the present application is implemented.

[0043] The vehicle and electrochemical impedance spectrum detection method provided in the embodiment of the present application is provided with a BMS and a battery module in the vehicle, and the BMS is connected to the battery module. Specifically, the BMS controls the battery module to be in an impedance parameter measurement mode, and the BMS detects the target voltage of the battery module when the battery module is in the impedance parameter measurement mode, and obtains the impedance parameter of the battery module according to the target excitation current and the target voltage.

[0044] Among them, when the battery module is in the impedance parameter measurement mode, the working current of the battery module is the target excitation current, which can stimulate the battery module to generate charge transfer and / or mass transfer. In this process, the BMS can detect the target voltage of the battery module when it works based on the target excitation current, and then calculate or determine the impedance parameter of the battery module when it works based on the target excitation current according to the target excitation current and the target voltage.

[0045] It can be seen that in the vehicle provided in the present application, the BMS can control the battery module to be in the impedance parameter test mode at any time according to actual needs to detect or obtain the impedance parameters of the battery module, without having to remove the battery module from the vehicle and perform EIS detection on the battery module through a dedicated detection device.

[0046] In this way, the BMS can obtain the impedance parameters of the battery module in real time and conveniently, thereby improving the monitoring capability of the BMS on the battery module, so as to at least partially solve the technical problems raised in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A schematic diagram of the structure of a first vehicle provided in an embodiment of the present application;

[0049] Figure 2 A schematic diagram of the structure of a second vehicle provided in an embodiment of the present application;

[0050] Figure 3 A schematic diagram of the structure of a third vehicle provided in an embodiment of the present application;

[0051] Figure 4 A schematic diagram of the structure of a fourth vehicle provided in an embodiment of the present application;

[0052] Figure 5 A schematic diagram of the structure of a fifth vehicle provided in an embodiment of the present application;

[0053] Figure 6 A schematic diagram of the structure of a sixth vehicle provided in an embodiment of the present application;

[0054] Figure 7 A flow chart of a first electrochemical impedance spectroscopy detection method provided in an embodiment of the present application;

[0055] Figure 8A flow chart of a second electrochemical impedance spectroscopy detection method provided in an embodiment of the present application;

[0056] Fig. 9 A flow chart of a third electrochemical impedance spectroscopy detection method provided in an embodiment of the present application;

[0057] Fig.10 A flow chart of a fourth electrochemical impedance spectroscopy detection method provided in an embodiment of the present application;

[0058] Fig.11 A schematic diagram of the structure of an electrochemical impedance spectroscopy detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0061] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0062] It should be pointed out that the terms "first\second\third" involved in the embodiments of the present application are used to distinguish similar or different objects, and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0063] In the related art, the related technicians generally install a BMS in the electric vehicle, and the BMS monitors the power battery in the electric vehicle. For example, a voltage sensor, a current sensor and a temperature sensor connected to the BMS can be installed for the power battery, so that the BMS can obtain various electrical parameters of the power battery in real time.

[0064] However, parameters such as the impedance characteristics of the battery during use are also very important. However, due to the complexity of EIS detection, the impedance characteristics of the battery can generally only be obtained by performing EIS detection on the battery in a laboratory environment through a dedicated EIS detection device. Therefore, the solutions in the relevant technology have the problem of being unable to detect the impedance characteristics of the power battery in the vehicle in real time and conveniently.

[0065] To this end, an embodiment of the present application provides a vehicle, in which a battery module and a BMS are arranged, and the BMS is connected to the battery module. Specifically, the BMS is used to control the battery module to be in an impedance parameter measurement mode, and the operating current of the battery module in the impedance parameter measurement mode is the target excitation current; and, when the battery module is in the impedance parameter measurement mode, the target voltage of the battery module is detected, and the impedance parameters of the battery module are obtained according to the target excitation current and the target voltage. In this way, the BMS in the vehicle can obtain the impedance parameters of the battery module in real time and conveniently, thereby improving the monitoring capability of the BMS on the battery module.

[0066] The present application embodiment is described by taking the electrochemical impedance spectroscopy detection method applied in a vehicle as an example, but it does not mean that the present application embodiment can only be applied to vehicles.

[0067] Optionally, the vehicle in the embodiment of the present application may be any vehicle equipped with a battery, and the vehicle may include but is not limited to a pure electric vehicle, an extended-range vehicle, a hybrid vehicle, and a flying car.

[0068] In order to make the purpose and technical solution of the present application clearer and more intuitive, the vehicle provided in the embodiment of the present application is explained in detail below.

[0069] Figure 1 A schematic diagram of a vehicle process provided by this application. Figure 1 , an embodiment of the present application provides a vehicle, the vehicle 100 at least includes: a BMS 101 and a battery module 102, and the BMS 101 is connected to the battery module 102.

[0070] The BMS 101 is used to control the battery module 102 to be in an impedance parameter measurement mode.

[0071] Furthermore, when the battery module 102 is in the impedance parameter measurement mode, the target voltage of the battery module 102 is detected, and the impedance parameter of the battery module 102 is obtained according to the target excitation current and the target voltage.

[0072] In this embodiment, the target excitation current may refer to a working current for exciting the battery module 102 to generate charge transfer and / or mass transfer. The target voltage may refer to an output voltage of the battery module 102.

[0073] Optionally, BMS101 can be used to monitor the temperature, current value, voltage value, SOC and other parameters of the battery module 102 in real time, manage the charging process and discharging process of the battery module 102, balance the consistency between the battery cells in the battery module 102, perform thermal management of the battery module 102, and / or evaluate the health status of the battery module 102 and the battery cells in the battery module 102. BMS101 may also have any other possible functions, which are not limited to the embodiments of the present application.

[0074] Optionally, the BMS 101 may have functions such as processing, control, identification, and calculation. Generally, the BMS 101 may be implemented based on a microcontroller unit (MCU).

[0075] Moreover, BMS101 may also include a battery sampling chip (Anlalog Front End, referred to as AFE), which can be used to collect parameters such as voltage and temperature of each battery cell in the battery module 102; BMS101 may also include an analog-to-digital converter (Analog-to-Digital Converter, referred to as ADC), which can convert the analog signal collected by AFE into a digital signal that can be recognized by MCU; BMS101 may also include a CAN communication module or other types of communication modules, so that BMS101 can communicate with other external devices or apparatuses. The embodiments of the present application are not limited to this.

[0076] Optionally, the battery module 102 may be any possible battery module in the vehicle 100 , for example, the battery module 102 may be a power battery module in the vehicle 100 that provides power for a motor, or may be a low-voltage battery module in the vehicle 100 that provides power for onboard electronic equipment.

[0077] Generally, the battery module 102 may include a plurality of battery cells connected in series, and the rated voltage and rated current of each battery cell are the same, which is not limited in the present embodiment.

[0078] Exemplarily, BMS101 can control the battery module 102 to be in the impedance parameter measurement mode without affecting the normal operation of the battery module 102 and / or the vehicle 100. For example, BMS101 can control the battery module 102 to be in the impedance parameter measurement mode when the external charging device is charging the battery module 102; BMS101 can also control the battery module 102 to be in the impedance parameter measurement mode when the vehicle 100 is powered on and the vehicle 100 is not driving; BMS101 can also control the battery module 102 to be in the impedance parameter measurement mode when the vehicle 100 is turned off and the battery module 102 is powered off with a delay; BMS101 can also control the battery module 102 to be in the impedance parameter measurement mode when the vehicle 100 is running; the embodiments of the present application do not limit this.

[0079] Optionally, the impedance parameter measurement mode refers to a mode that enables the BMS 101 to measure the impedance parameter of the battery module 102. Moreover, the operating current of the battery module 102 in the impedance parameter measurement mode is the target excitation current.

[0080] It is understandable that when the battery module 102 is in the impedance parameter measurement mode, the operating current of the battery module 102 may be a specific target excitation current, wherein the operating current of the battery module 102 may be the current output by the battery module 102 or the current input to the battery module 102 by other devices.

[0081] Specifically, the target excitation current may be used to stimulate the battery module 102 to generate charge transfer and / or mass transfer, so that the BMS 101 may detect impedance parameters of the battery module 102 and / or each battery cell in the battery module 102 .

[0082] In some possible ways, the target excitation current can be set by relevant technicians according to actual needs. Moreover, the target excitation current can refer to a current signal with a certain period, frequency and amplitude. For example, the target excitation current can be a sine wave signal or a rectangular wave signal. Exemplarily, the amplitude of the target excitation current can generally be set smaller to avoid damage or other adverse effects on the battery module 102 as much as possible. In actual application, it can be set according to actual needs, and the embodiments of the present application are not limited to this.

[0083] Furthermore, BMS101 can control the battery module 102 to be in the impedance parameter measurement mode by sending corresponding control instructions to the battery module 102 so that the battery module 102 performs self-excitation. BMS101 can also control the battery module 102 to be in the impedance parameter measurement mode by sending corresponding control instructions to the power loads connected to the battery module 102 so that the battery module 102 outputs the target excitation current to these power loads. BMS101 can also control the battery module 102 to be in the impedance parameter measurement mode by sending corresponding control instructions to the charging device connected to the battery module 102 so that the charging device inputs the target excitation current to the battery module 102. The embodiments of the present application are not limited to this.

[0084] Specifically, the target voltage may refer to the voltage between the positive and negative electrodes of the battery module 102, that is, the overall voltage of the battery module 102. For example, if the cells in the battery module 102 are connected in series, the target voltage is the sum of the cell voltages of the cells in the battery module 102.

[0085] Exemplarily, the corresponding voltage sensors and / or probes can be connected to the positive and negative electrodes of the battery module 102 respectively, and then the voltage sensors and / or probes output the detected voltage signals to BMS101, so that BMS101 can detect the target voltage of the battery module 102. This embodiment of the present application is not limited to this.

[0086] Specifically, BMS101 can calculate the target excitation current and the target voltage based on Ohm's law and / or the corresponding impedance calculation formula to obtain the impedance parameter. In general, if the target excitation current is direct current, the impedance parameter can be simplified to resistance; if the target excitation current is alternating current, the impedance parameter can include resistance and reactance. Moreover, the impedance parameter can be specifically calculated based on the effective value of the target excitation current and the effective value of the target voltage. The embodiments of the present application are not limited to this.

[0087] It should be noted that, in actual application, the target excitation current may include a variety of different parameters. Then, when the battery module 102 is in the impedance parameter measurement mode, the battery module 102 may work for a period of time based on the target excitation currents with different parameters. During this process, the BMS 101 may detect the target voltage of the battery module 102 when it works based on the currents with different parameters, and then calculate the impedance parameters using each target voltage and the target excitation current corresponding to each target voltage.

[0088] For example, the target excitation current is a rectangular wave signal, and the battery module 102 can work based on a target excitation current with a frequency of 10 Hz and an amplitude of 1 ampere (A). Then, the BMS 101 can further determine the impedance parameters of the battery module 102 under the working condition of a frequency of 10 Hz and an amplitude of 1A; the battery module 102 can work based on a target excitation current with a frequency of 20 Hz and an amplitude of 1.5A. Then, the BMS 101 can further determine the impedance parameters of the battery module 102 under the working condition of a frequency of 20 Hz and an amplitude of 1.5A; and so on, the BMS 101 can obtain the impedance parameters of the battery module 102 under various working conditions. The embodiments of the present application are not limited to this.

[0089] It is worth noting that although in the relevant technology, vehicles are generally equipped with BMS and battery modules, and BMS will also monitor or control the battery modules of the vehicle, generally by detecting the voltage, current, temperature, SOC and other parameters of the battery modules. However, in this solution, BMS cannot directly measure the impedance parameters of the battery modules of the vehicle. If the impedance parameters of the battery modules of the vehicle are to be obtained, the battery modules need to be removed from the vehicle and EIS tests are performed on the battery modules using a dedicated detection device in a laboratory environment. It can be seen that this solution has the problem of being unable to detect the impedance characteristics of the power battery modules in the vehicle in real time and conveniently.

[0090] It is worth noting that in the present application, the BMS 101 can control the battery module 102 to be in an impedance parameter measurement mode, that is, to make the working current of the battery module 102 the target excitation current to stimulate the battery module 102 to generate charge transfer and / or mass transfer. In this process, the BMS 101 can detect the target voltage of the battery module 102 when it works based on the target excitation current, and then can calculate or determine the impedance parameter of the battery module 102 when it works based on the target excitation current according to the target excitation current and the target voltage.

[0091] In this way, the BMS 101 in the vehicle 100 can control the battery module 102 to be in the impedance parameter test mode, so that the BMS 101 can detect or obtain the impedance parameters of the battery module 102 in real time.

[0092] In the embodiment of the present application, a BMS 101 and a battery module 102 are provided in the vehicle 100, and the BMS 101 is connected to the battery module 102. Specifically, the BMS 101 controls the battery module 102 to be in an impedance parameter measurement mode, and when the battery module 102 is in the impedance parameter measurement mode, the BMS 101 detects the target voltage of the battery module 102, and acquires the impedance parameter of the battery module 102 according to the target excitation current and the target voltage.

[0093] Among them, when the battery module 102 is in the impedance parameter measurement mode, the working current of the battery module 102 is the target excitation current, which can stimulate the battery module 102 to generate charge transfer and / or mass transfer. In this process, the BMS 101 can detect the target voltage of the battery module 102 when it works based on the target excitation current, and then calculate or determine the impedance parameter of the battery module 102 when it works based on the target excitation current according to the target excitation current and the target voltage.

[0094] It can be seen that in the vehicle 100 provided in the present application, the BMS 101 can control the battery module 102 to be in the impedance parameter test mode at any time according to actual needs, so as to detect or obtain the impedance parameters of the battery module 102, without having to remove the battery module 102 from the vehicle 100 and perform EIS detection on the battery module 102 through a dedicated detection device.

[0095] In this way, the BMS 101 can obtain the impedance parameters of the battery module 102 in real time and conveniently, thereby improving the monitoring capability of the BMS 101 on the battery module 102 .

[0096] In addition, in the present application, the impedance parameters of the battery module 102 can be detected or obtained by reusing components or devices in the vehicle 100 without deploying other dedicated measuring devices in the vehicle 100. In this way, the purpose of obtaining the impedance parameters of the battery module 102 can be achieved at a lower cost.

[0097] For a possible implementation, see Figure 2 The vehicle 100 further includes a target power-consuming device 103 , which is connected to the battery module 102 and the BMS 101 , respectively.

[0098] The BMS 101 is further configured to output a first control instruction to the target electrical device 103 .

[0099] The target electrical device 103 is configured to be in a target operating state in response to the first control instruction.

[0100] Specifically, the first power terminal and the second power terminal of the target power device 103 may be connected to the positive electrode and the negative electrode of the battery module 102 respectively, and the control terminal of the target power device 103 may be connected to the first output terminal of the BMS 101 .

[0101] Optionally, the target electrical device 103 may be any possible electrical load in the vehicle 100, for example, a controller, a voltage converter, or any other possible load. This embodiment of the present application does not limit this.

[0102] When the target power device 103 is in the target operating state, the battery module 102 is in the impedance parameter measurement mode. That is, when the target power device 103 is in the target operating state, the battery module 102 can output the target excitation current to the target power device 103.

[0103] Optionally, the target operating state may be used to indicate the power demand of the target power-consuming device 103 , that is, current parameters (such as current frequency and current amplitude) required by the target power-consuming device 103 .

[0104] In a possible manner, the first control instruction may be an instruction for causing the target power-consuming device 103 to adjust its own operating state. That is, the first control instruction may be an instruction for changing the power demand of the target power-consuming device 103. When the power demand of the target power-consuming device 103 changes, the current output by the battery module 102 to the target power-consuming device 103 will also change, thereby causing the operating current of the battery module 102 to change.

[0105] Specifically, after receiving the first control instruction, the target power device 103 may adjust the target power device 103 to the target operating state according to a preset adjustment method. In this case, the preset adjustment method and / or the current parameters required by the target power device 103 after the target power device 103 is adjusted to the target operating state based on the preset adjustment method may be recorded in advance in the BMS 101.

[0106] Exemplarily, if the preset adjustment method is used to adjust the target electrical device 103 to a target operating state requiring a current of 10 Hz and 1 A within 0-1 seconds of receiving the first control instruction; and to adjust the target electrical device 103 to a target operating state requiring a current of 20 Hz and 1.5 A within 1-2 seconds of receiving the first control instruction. Then, in the case where the preset adjustment method is recorded in advance in BMS101, BMS101 can determine that the target voltage detected within 0-1 seconds after outputting the first control instruction (or the target voltage detected at 0.5 seconds) corresponds to the target excitation current of 10 Hz and 1 A, and the target voltage detected within 1-2 seconds (or the target voltage detected at 1.5 seconds) corresponds to the target excitation current of 20 Hz and 1.5 A.

[0107] In this way, the BMS 101 can determine the current value of the target excitation current output by the battery module 102 to the target power device 103 when the target power device 103 operates in the target operating state, so as to accurately calculate the impedance parameters of the battery module 102 later.

[0108] In another possible manner, the first control instruction may also include a target operating parameter.

[0109] The target electrical device 103 is further configured to adjust the current operating parameter to the target operating parameter in response to the first control instruction, so that the target electrical device 103 is in the target operating state.

[0110] Optionally, the target operating parameter may be used to indicate a power demand of the target electrical device 103 and / or a current parameter required by the target electrical device 103 .

[0111] Exemplarily, the target operating parameters may be 10 Hz, 1 A. After responding to and parsing the first control instruction, the target electrical device 103 may obtain the target operating parameters, and then change the current required by the target electrical device 103 to 10 Hz, 1 A, thereby placing the target electrical device 103 in the target operating state.

[0112] For another example, BMS101 can also output multiple first control instructions for indicating different target operating parameters to the target power device 103 based on the timing. Specifically, BMS101 can output the first control instruction with the target operating parameters of 15HZ and 1.5A to the target power device 103 within 0-2 seconds, and output the first control instruction with the target operating parameters of 30HZ and 2A to the target power device 103 within 2-4 seconds. Then, each time the target power device 103 receives a first control instruction, it can parse the first control instruction and adjust the current operating parameters to the target operating parameters indicated by the first control instruction, thereby placing the target power device 103 in the target operating state.

[0113] Moreover, each time after BMS101 sends a first control instruction, it can detect the target voltage of the battery module 102, and BMS101 can also determine the current target excitation current according to the target operating parameters indicated by the first control instruction currently sent, and then calculate the current impedance parameter of the battery module 102 according to the target voltage and the target excitation current. It can be seen that when BMS101 sends multiple different first control instructions, BMS101 will calculate or obtain the impedance parameters of the battery module 102 under different excitation currents.

[0114] As can be seen from the above, in the vehicle 100 provided in the present application, the BMS 101 can make the target power device 103 be in the target operating state in a variety of ways, thereby making the battery module 102 output the target excitation current corresponding to the target operating state to the target power device 103. In this way, the flexibility of making the battery module 102 be in the impedance parameter measurement mode by controlling the operating state of the target power device 103 can be improved.

[0115] For a possible implementation, see Figure 3 , the target electrical device 103 is a high voltage controller 1031 in the vehicle 100 .

[0116] The high voltage controller 1031 is used to supply power to the first electrical device 104 in the vehicle 100 .

[0117] Optionally, the high-voltage controller 1031 may be any controller in the vehicle 100 that has functions such as communication, control, and parameter adjustment. For example, it may be a motor controller for controlling a motor in the vehicle 100, or a high-voltage distribution box for performing power distribution control in the vehicle 100, or any other possible controller. This embodiment of the application does not limit this.

[0118] Optionally, the first electrical device 104 may be any possible high-voltage electrical device in the vehicle 100 , such as a drive motor, a compressor, etc. in the vehicle 100 .

[0119] Specifically, the operating voltage of the first power-consuming device 104 is greater than or equal to the first threshold. The first threshold can be set by relevant technical personnel according to actual needs. Generally, the first threshold can be set as large as possible. For example, if the rated voltage of the battery module 102 is 400V, the first threshold can be set to 300V, 350V or 400V.

[0120] It is worth noting that in the vehicle 100, the output power of the battery module 102 is the input power of the target power device 103. Therefore, when the input power of the target power device 103 remains unchanged, the lower the voltage at the output side of the target power device 103, the greater the current flowing out of the output side of the target power device 103. Therefore, other devices connected to the output side of the target power device 103 may be subjected to a large current or even damaged.

[0121] It is worth noting that, in general, the high-voltage controller 1031 and the battery module 102 are both in a high-voltage network or a high-voltage domain, and the operating voltage of the first electrical device connected to the high-voltage controller 1031 is also relatively high. Then, when the input power of the high-voltage controller 1031 remains unchanged, the voltage difference between the input side and the output side of the high-voltage controller 1031 is relatively small, so the current flowing out of the high-voltage controller 1031 is relatively close to the current value of the target excitation current. If the output side voltage of the high-voltage controller 1031 is equal to the voltage of the battery module 102, then the current flowing out of the high-voltage controller 1031 is equal to the target excitation current.

[0122] Therefore, by using the high voltage controller 1031 as the target power device 103, it is possible to avoid as much as possible the problem that other power devices connected to the target power device 103 are damaged due to the need for the target power device 103 to enter the above-mentioned target operating state and the battery module 102 to be in the impedance parameter measurement mode. In this way, the safety of measuring the impedance parameters of the battery module 102 can be improved.

[0123] In addition, when the high-voltage controller 1031 is used as the target power-consuming device 103, the battery module 102 can be operated based on a higher target excitation current, that is, the range of the amplitude of the target current excitation can be expanded as much as possible under the premise of being able to safely detect the impedance parameters of the battery module 102. In this way, the BMS 101 can obtain more impedance parameters, improve the accuracy of measuring the impedance parameters of the battery module 102, and improve the monitoring capability of the BMS 101 on the battery module 102.

[0124] For another possible implementation, see Figure 4 , the target electrical device 103 is a low voltage converter 1032 in the vehicle 100 .

[0125] The low voltage converter 1032 supplies power to the second electrical device 105 in the vehicle 100 .

[0126] Optionally, the low voltage converter 1032 may be any converter in the vehicle 100 that has functions such as communication and voltage regulation. For example, the low voltage converter 1032 may be a low voltage DCDC, which is not limited in the embodiment of the present application.

[0127] Optionally, the second electrical device 105 may be any possible low-voltage electrical device in the vehicle 100 , such as an on-board entertainment device, an on-board terminal, a lighting device, an image acquisition device, a radar device, etc. in the vehicle 100 .

[0128] Specifically, the operating voltage of the second electrical device 105 is less than or equal to the second threshold value. The second threshold value may be set by relevant technical personnel according to actual needs. Generally, the second threshold value is less than the first threshold value.

[0129] The second threshold value may be set as small as possible. For example, if the rated voltage of the battery module 102 is 400V, the second threshold value may be set to 12V, 24V or 36V.

[0130] It is worth noting that in the vehicle 100 , a variety of different devices can be used as the target power-consuming device 103 to put the battery module 102 in the impedance parameter measurement mode. It can be seen that the vehicle 100 provided in the present application has high flexibility when measuring the impedance parameters of the battery module 102 .

[0131] For a possible implementation, see Figure 5 The vehicle 100 further includes an OBC 106 , which is connected to the battery module 102 and the BMS 101 , respectively.

[0132] Specifically, the first output terminal and the second output terminal of the OBC 106 may be connected to the positive electrode and the negative electrode of the battery module 102 , respectively, and the control terminal of the OBC 106 may be connected to the second output terminal of the BMS 101 .

[0133] Optionally, OBC 106 may be a device for charging the battery module 102 using the power of an external charging device. In this way, when the external charging device is charging the battery module 102, OBC 106 may be used to stimulate the battery module 102, thereby minimizing the impact on other electrical loads in the vehicle 100.

[0134] The BMS 101 is also used to output a second control instruction to the OBC 106 .

[0135] The OBC 106 is configured to output the target excitation current to the battery module 102 in response to the second control instruction, so that the battery module 102 is in the impedance parameter measurement mode.

[0136] In one possible manner, the second control instruction may be an instruction for causing OBC106 to output the target excitation current to the battery module 102 in a preset output mode. That is, the second control instruction may be an instruction specifically used to trigger OBC106 to output the target excitation current. When OBC106 outputs the target excitation current to the battery module 102, it is equivalent to OBC106 charging the battery module 102 based on the target excitation current, and the operating current of the battery module 102 is the target excitation current.

[0137] For example, if the preset output mode of OBC106 is: within 0-1 seconds after receiving the second control instruction, output a target excitation current of 20HZ and 2A to the battery module 102; within 1-2 seconds after receiving the second control instruction, output a target excitation current of 30HZ and 3A to the battery module 102. Then, the preset output mode can be recorded in advance in BMS101, and BMS101 can determine that the target voltage detected within 0-1 seconds after outputting the second control instruction (or the target voltage detected at 0.5 seconds) corresponds to the target excitation current of 20HZ and 2A, and the target voltage detected within 1-2 seconds (or the target voltage detected at 1.5 seconds) corresponds to the target excitation current of 30HZ and 3A.

[0138] In this way, the BMS 101 can determine the current value of the target excitation current output by the OBC 106 to the battery module 102 , so that the impedance parameters of the battery module 102 can be accurately calculated later.

[0139] In another possible manner, the second control instruction also includes a target current parameter.

[0140] Optionally, the target current parameter is a parameter for controlling the OBC 106 to output the target excitation current. That is, the target current parameter may indicate the specific frequency and amplitude of the target excitation current that the OBC 106 needs to output to the battery module 102 .

[0141] In this way, BMS101 can directly control the output of OBC106, and OBC106 does not need to output according to the preset output mode, which can simplify the processing flow of BMS101 and / or OBC106, thereby improving the efficiency of measuring the impedance parameters of the battery module 102.

[0142] For a possible implementation, see Figure 6 The battery module 102 includes: a first battery group 1021, a second battery group 1022 and a DCDC 1023.

[0143] The first battery pack 1021 is connected to a first end of the DCDC 1023 , and the second battery pack 1022 is connected to a second end of the DCDC 1023 . The DCDC 1023 is also connected to the BMS 101 .

[0144] The BMS101 is also used to output a third control instruction to the DCDC1023 .

[0145] DCDC1023 is used to adjust the voltage at the first end and the voltage at the second end of DCDC1023 in response to the third control instruction, so that the first battery group 1021 outputs the target excitation current to the second battery group 1022, or the second battery group 1022 outputs the target excitation current to the first battery group 1021, so that the battery module 102 is in the impedance parameter measurement mode.

[0146] Optionally, the first battery group 1021 and the second battery group 1022 each include at least one battery cell, and each battery cell in the first battery group 1021 is different from each battery cell in the second battery group 1022 .

[0147] Furthermore, each battery cell in the first battery group 1021 and each battery cell in the second battery group 1022 may be connected in series.

[0148] Optionally, DCDC1023 can be used for voltage conversion. DCDC1023 can specifically be a bidirectional DCDC. DCDC1023 can be composed of a DCDC controller and two half-bridge circuits. The DCDC controller has certain processing functions and control functions; each half-bridge circuit can independently operate in Boost mode or Buck mode; when boost is required, one of the half-bridge circuits can operate in Boost mode; when buck is required, the other half-bridge circuit operates in Buck mode; in this way, the direction of the voltage and / or current between the first end and the second end of DCDC1023 can be changed.

[0149] In a possible manner, the third control instruction may be an instruction for causing DCDC1023 to adjust the direction of voltage and current. That is, the third control instruction may be used to change the direction of voltage and current between the first terminal and the second terminal of DCDC1023, so that the first battery pack 1021 charges the second battery pack 1022, or the second battery pack 1022 charges the first battery pack 1021.

[0150] Specifically, after receiving the third control instruction, DCDC1023 can adjust the voltage of the first terminal and the voltage of the second terminal of DCDC1023 in a preset manner. In this case, the preset manner can be recorded in advance in BMS101, and / or the operating current of the first battery group 1021 and the second battery group 1022 after DCDC1023 adjusts the voltage of the first terminal and the voltage of the second terminal of DCDC1023 in the preset manner.

[0151] Exemplarily, if the preset mode is used to make DCDC1023 charge the second battery group 1022 with a current of 10 Hz and 1 A within 0-1 seconds after receiving the third control instruction, and charge the first battery group 1021 with a current of 20 Hz and 2 A within 1-2 seconds after receiving the first control instruction, then, in the case where the preset mode is recorded in BMS101 in advance, BMS101 can determine that the target voltage detected within 0-1 seconds after outputting the third control instruction (or the target voltage detected at 0.5 seconds) corresponds to the target excitation current of 10 Hz and 1 A, and the target voltage detected within 1-2 seconds (or the target voltage detected at 1.5 seconds) corresponds to the target excitation current of 20 Hz and 2 A.

[0152] In this way, the BMS 101 can determine the current value of the target excitation current (ie, the working current of the battery module 102 ) generated by the battery module 102 when the battery module 102 is self-excited, so as to accurately calculate the impedance parameters of the battery module 102 subsequently.

[0153] In another possible manner, the third control instruction also includes a voltage adjustment parameter.

[0154] DCDC1023 is further configured to respond to the third control instruction and adjust the voltage of the first end and the voltage of the second end of DCDC1023 according to the voltage adjustment parameter.

[0155] The first battery pack 1021 is used to output the target excitation current to the second battery pack 1022 through the DCDC 1023 when the voltage at the first end of the DCDC 1023 is greater than the voltage at the second end.

[0156] The second battery pack 1022 is used to output the target excitation current to the first battery pack 1021 through the DCDC 1023 when the voltage at the second end of the DCDC 1023 is greater than the voltage at the first end.

[0157] Optionally, the voltage adjustment parameter includes an adjustment voltage and an adjustment frequency.

[0158] It should be noted that, since the target excitation current may be a sine wave signal or a rectangular wave signal with a certain period and frequency, and the first battery pack 1021 and the second battery pack 1022 generally output direct current, the voltages at the first and second ends of the DCDC 1023 may be adjusted according to the adjustment frequency indicated by the voltage adjustment parameter, so that the current flowing through the DCDC 1023 has a periodic characteristic.

[0159] In addition, generally, when the power of DCDC1023 remains unchanged, if the voltage of the first terminal and the voltage of the second terminal of DCDC1023 change, the current flowing through the first terminal of DCDC1023 and the current flowing through the second terminal of DCDC1023 will also change. Therefore, the voltage of the first terminal and the second terminal of DCDC1023 can be adjusted according to the adjustment voltage indicated by the voltage adjustment parameter, thereby controlling the amplitude of the current flowing through DCDC1023.

[0160] In this way, the purpose of controlling the parameters of the working current of the battery module 102 can be achieved by controlling DCDC1023, so that the working current of the battery module 102 is the target excitation current.

[0161] Exemplarily, BMS101 can also output multiple third control instructions for indicating different voltage adjustment parameters to DCDC1023 based on the timing. Specifically, BMS101 can output a third control instruction to DCDC1023 within 0-1 seconds, so that the first battery group 1021 charges the second battery group 1022 at a current of 10HZ and 1A; BMS101 can also output a third control instruction to DCDC1023 within 1-2 seconds, so that the first battery group 1021 charges the second battery group 1022 at a current of 20HZ and 2A.

[0162] Moreover, each time after BMS101 sends a third control instruction, it can detect the target voltage of the battery module 102, and BMS101 can also determine the current target excitation current according to the voltage adjustment parameter indicated by the third control instruction currently sent, and then calculate the current impedance parameter of the battery module 102 according to the target voltage and the target excitation current. It can be seen that when BMS101 sends multiple different third control instructions, BMS101 can calculate or obtain the impedance parameters of the battery module 102 under different excitation currents.

[0163] It is worth noting that, when the battery module 102 is used for self-excitation and the battery module 102 is in the impedance parameter measurement mode, the impact on other devices in the vehicle 100 can be minimized. Specifically, when the battery module 102 is excited in this way, other devices in the vehicle 100 do not need to change their own power demand or working state, and the problem that other devices may be subjected to large current or damaged due to the need to measure the impedance parameters of the battery module 102 can be avoided as much as possible.

[0164] In addition, the first battery group 1021 and the second battery group 1022 may also be connected to the BMS 101 , respectively, so that the BMS 101 can measure the target voltage of the first battery group 1021 , the second battery group 1022 and / or the battery module 102 .

[0165] In a possible implementation, the BMS 101 may further control the battery module 102 to be in the impedance parameter measurement mode when certain preset conditions are met. Moreover, the BMS 101 may further control the battery module 102 to be in the impedance parameter measurement mode at a certain frequency.

[0166] Optionally, the preset condition can be set by relevant technical personnel according to actual needs. For example, the preset condition can include but is not limited to: the battery module 102 is in an AC / DC charging state, the vehicle 100 is in a state where the vehicle is powered on but not driving, and the vehicle 100 is in a delayed power-off state.

[0167] Exemplarily, the BMS 101 may control the timing and frequency of the battery module 102 being in the impedance parameter measurement mode in the following manners.

[0168]

[0169] It is worth noting that the "excitation frequency" and / or "excitation cycle" in the above table refers to the frequency of controlling the battery module 102 in the impedance parameter measurement mode. "Normal state" refers to the state in which the parameters such as the charging voltage, charging current and charging temperature of the battery module 102 are within the normal range, and "abnormal state" refers to the state in which any parameter such as the charging voltage, charging current or charging temperature of the battery module 102 exceeds the normal range.

[0170] Since the electrochemical reaction of the battery module 102 may be relatively intense when the battery module 102 is in a charging state, the battery module 102 needs to be excited at a higher frequency to detect the impedance parameters of the battery module 102. In this way, the monitoring capability of the BMS 101 on the battery module 102 can be improved, and the practicality of the vehicle 100 can be improved.

[0171] It should be noted that the several situations listed in the above table are only examples provided by the embodiments of the present application, and do not mean that the vehicle 100 and / or BMS 101 provided by the embodiments of the present application can only control the battery module 102 in the several ways listed in the above table. In actual application, the BMS 101 can control the battery module 102 to be in the impedance parameter measurement mode in any possible scenario, at any possible frequency and cycle. The embodiments of the present application are not limited to this.

[0172] In addition, based on the same inventive concept, an embodiment of the present application also provides an electrochemical impedance spectroscopy detection method, which is applied to the vehicle 100 provided in any of the above embodiments. The method can be specifically performed by the BMS101 and / or any other possible components in the vehicle 100, and the embodiment of the present application is not limited to this.

[0173] See also Figure 7 , the method provided in the embodiment of the present application includes:

[0174] Step 201: The BMS controls the battery module to be in an impedance parameter test mode.

[0175] Optionally, the BMS may be the aforementioned BMS101 , and the battery module may be the aforementioned battery module 102 .

[0176] Optionally, the operating current of the battery module in the impedance parameter measurement mode is the target excitation current.

[0177] Step 202: When the battery module is in the impedance parameter measurement mode, the target voltage of the battery module is detected by the BMS.

[0178] Step 203: The BMS obtains the impedance parameter of the battery module according to the target excitation current and the target voltage.

[0179] It is worth noting that the BMS can control the battery module to be in the impedance parameter test mode at any time according to actual needs to detect or obtain the impedance parameters of the battery module without the need to perform EIS detection on the battery module through a dedicated detection device.

[0180] In this way, the BMS in the vehicle can obtain the impedance parameters of the battery module in real time and conveniently, thereby improving the monitoring capability of the BMS on the battery module.

[0181] In the case where the vehicle further includes a target power-consuming device, and the target power-consuming device is connected to the battery module and the BMS respectively, the embodiment of the present application further provides a possible implementation method, see Figure 8 , the BMS controls the battery module to be in impedance parameter test mode, including:

[0182] Step 2011: The BMS outputs a first control instruction to the target electrical device.

[0183] Optionally, the target electric device may be the target electric device 103 mentioned above.

[0184] Step 2012: The target electrical device is in a target operating state in response to the first control instruction.

[0185] Wherein, when the target electrical device is in the target operating state, the battery module is in the impedance parameter measurement mode.

[0186] In the case where the vehicle further includes an OBC, and the OBC is connected to the battery module and the BMS respectively, the embodiment of the present application also provides a possible implementation method, see Fig. 9 , the BMS controls the battery module to be in impedance parameter test mode, including:

[0187] Step 2013: The BMS outputs a second control instruction to the OBC.

[0188] Alternatively, the OBC may be the OBC 106 described above.

[0189] Step 2014: The OBC outputs the target excitation current to the battery module in response to the second control instruction, so that the battery module is in the impedance parameter measurement mode.

[0190] In the case where the battery module includes a first battery pack, a second battery pack and a DCDC, and the DCDC is connected to the BMS, the embodiment of the present application also provides a possible implementation method, see Fig.10 , the BMS controls the battery module to be in impedance parameter test mode, including:

[0191] Step 2015: The BMS outputs a third control instruction to the battery module.

[0192] Optionally, the third control instruction may be specifically output to a DCDC in the battery module, and the DCDC may be the above-mentioned DCDC1023.

[0193] Step 2016: The DCDC adjusts the voltage at the first end and the voltage at the second end of the DCDC in response to the third control instruction, so that the first battery group outputs the target excitation current to the second battery group through the DCDC, or the second battery group outputs the target excitation current to the first battery group, so that the battery module is in the impedance parameter measurement mode.

[0194] It should be noted that the above-mentioned embodiments are descriptions of the electrochemical impedance spectroscopy detection method used in the vehicle 100 provided in this application. The specific implementation process and technical effects of the method can refer to the description of the various embodiments of the above-mentioned vehicle 100, and this application will not elaborate on them here.

[0195] Since the electrochemical impedance spectroscopy detection method provided in this application and the above-mentioned vehicle 100 belong to the same inventive concept, the method may also include any other possible steps to enable the vehicle 100 to achieve any technical effect and function. This application will not elaborate on this.

[0196] In addition, the functions implemented by the method can be implemented by calling program codes through the BMS or other processors in the vehicle. Of course, the program codes can be stored in computer storage media. It can be seen that the vehicle can also include storage media.

[0197] It should be understood that, although the steps in the above-mentioned flowcharts are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above-mentioned flowcharts may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0198] Based on the foregoing embodiments, the embodiments of the present application provide an electrochemical impedance spectroscopy detection device, which includes the modules included and the units included in the modules, which can be implemented by a processor; of course, it can also be implemented by a specific logic circuit; in the implementation process, the processor can be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP) or a field programmable gate array (FPGA), etc.

[0199] Fig.11 is a schematic diagram of the structure of an electrochemical impedance spectroscopy detection device provided in an embodiment of the present application, see Fig.11 , the device comprises:

[0200] The control module 301 is used to control the battery module to be in an impedance parameter test mode by the BMS, and the working current of the battery module in the impedance parameter measurement mode is a target excitation current;

[0201] A detection module 302 is used to detect a target voltage of the battery module through the BMS when the battery module is in the impedance parameter measurement mode;

[0202] The processing module 303 is used for the BMS to obtain the impedance parameter of the battery module according to the target excitation current and the target voltage.

[0203] The description of the above device embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the device embodiment of the present application, please refer to the description of the method embodiment of the present application for understanding.

[0204] It should be noted that in the embodiments of this application Fig.11 The division of modules in the electrochemical impedance spectroscopy detection device shown is schematic, and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application can be integrated in a processing unit, or it can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. It can also be implemented in the form of a combination of software and hardware.

[0205] It should be noted that in the embodiment of the present application, if the above method is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiment of the present application can be essentially or partly embodied in the form of a software product that contributes to the relevant technology. The computer software product is stored in a storage medium, including several instructions to enable an electronic device to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a disk or an optical disk. In this way, the embodiment of the present application is not limited to any specific combination of hardware and software.

[0206] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the method provided in the above embodiment are implemented.

[0207] An embodiment of the present application provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the steps of the method provided in the above method embodiment.

[0208] Those skilled in the art will understand that Figure 1-6 The structure shown in the figure is merely a block diagram of a portion of the structure related to the present application scheme, and does not constitute a limitation on the vehicle provided by the present application scheme. A specific vehicle may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0209] In one embodiment, the electrochemical impedance spectroscopy detection device provided in the present application can be implemented in the form of a computer program, and the computer program can be run on any possible device. The memory of the device can store various program modules that constitute the above-mentioned device. The computer program composed of various program modules enables the processor to execute the steps in the method of each embodiment of the present application described in this specification.

[0210] It should be noted here that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium, storage medium and device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0211] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in one embodiment" or "in some embodiments" appearing throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between the various embodiments, and the same or similar aspects can be referenced to each other. For the sake of brevity, this article will not repeat them.

[0212] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0213] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0214] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as: multiple modules or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or modules can be electrical, mechanical or other forms.

[0215] The modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules; they may be located in one place or distributed on multiple network units; some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0216] In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be a separate unit, or two or more modules may be integrated into one unit; the above-mentioned integrated modules may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0217] A person skilled in the art can understand that all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, etc., various media that can store program codes.

[0218] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application can essentially or in other words, the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling an electronic device to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0219] The methods disclosed in several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0220] The features disclosed in several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0221] The features disclosed in several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0222] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0223] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle, characterized in that: The vehicle comprises: a battery module and a battery management system BMS, wherein the BMS is connected to the battery module, wherein: The BMS is used to control the battery module to be in an impedance parameter measurement mode, and the working current of the battery module in the impedance parameter measurement mode is a target excitation current; And, when the battery module is in the impedance parameter measurement mode, the target voltage of the battery module is detected, and the impedance parameter of the battery module is obtained according to the target excitation current and the target voltage.

2. The vehicle according to claim 1, characterized in that The vehicle further includes: a target power-consuming device, wherein the target power-consuming device is connected to the battery module and the BMS respectively, wherein: The BMS is further configured to output a first control instruction to the target electrical device; The target electrical device is configured to be in a target operating state in response to the first control instruction, wherein when the target electrical device is in the target operating state, the battery module is in the impedance parameter measurement mode.

3. The vehicle according to claim 2, characterized in that The first control instruction includes a target operating parameter; The target electrical device is further configured to adjust a current operating parameter to the target operating parameter in response to the first control instruction, so that the target electrical device is in the target operating state.

4. The vehicle according to claim 2 or 3, characterized in that: The target electrical device is a high-voltage controller in the vehicle, and the high-voltage controller is used to supply power to a first electrical device in the vehicle, wherein the operating voltage of the first electrical device is greater than or equal to a first threshold; Alternatively, the target electrical device is a low-voltage converter in the vehicle, and the low-voltage converter supplies power to a second electrical device in the vehicle, wherein an operating voltage of the second electrical device is less than or equal to a second threshold.

5. The vehicle according to claim 1, characterized in that The vehicle further includes an on-board charger OBC, and the OBC is connected to the battery module and the BMS respectively; wherein, The BMS is further configured to output a second control instruction to the OBC; The OBC is used to output the target excitation current to the battery module in response to the second control instruction, so that the battery module is in the impedance parameter measurement mode.

6. The vehicle according to claim 5, characterized in that The second control instruction also includes a target current parameter, where the target current parameter is a parameter for controlling the OBC to output the target excitation current.

7. The vehicle according to claim 1, characterized in that The battery module comprises: a first battery pack, a second battery pack and a DC-DC converter; The first battery pack is connected to the first end of the DC-DC converter, the second battery pack is connected to the second end of the DC-DC converter; the DC-DC converter is connected to the BMS; wherein, The BMS is further configured to output a third control instruction to the DC-DC converter; The DC-DC converter is used to adjust the voltage of the first terminal and the voltage of the second terminal of the DC-DC converter in response to the third control instruction, so that the first battery group outputs the target excitation current to the second battery group, or so that the second battery group outputs the target excitation current to the first battery group, so that the battery module is in the impedance parameter measurement mode.

8. The vehicle according to claim 7, characterized in that The third control instruction also includes a voltage adjustment parameter, and the voltage adjustment parameter includes an adjustment voltage and an adjustment frequency; The DC-DC converter is further configured to respond to the third control instruction and adjust the voltage of the first terminal and the voltage of the second terminal of the DC-DC converter according to the voltage adjustment parameter; The first battery pack is used for outputting the target excitation current to the second battery pack through the DC-DC converter when the voltage at the first terminal of the DC-DC converter is greater than the voltage at the second terminal; The second battery pack is used for outputting the target excitation current to the first battery pack through the DC-DC converter when the voltage at the second terminal of the DC-DC converter is greater than the voltage at the first terminal.

9. An electrochemical impedance spectroscopy detection method, characterized in that: Applicable to the vehicle according to any one of claims 1 to 8 above, the vehicle at least comprising a battery module and a battery management system BMS; the method comprising: The BMS controls the battery module to be in an impedance parameter test mode, and the working current of the battery module in the impedance parameter measurement mode is a target excitation current; When the battery module is in the impedance parameter measurement mode, detecting a target voltage of the battery module by the BMS; The BMS obtains the impedance parameter of the battery module according to the target excitation current and the target voltage.

10. The electrochemical impedance spectroscopy detection method according to claim 9, characterized in that: In a case where the vehicle further includes a target power-consuming device, and the target power-consuming device is respectively connected to the battery module and the BMS, the BMS controls the battery module to be in an impedance parameter test mode, including: Outputting a first control instruction by the BMS to the target electrical device; The target electrical device is in a target operating state in response to the first control instruction; Wherein, when the target electrical device is in the target operating state, the battery module is in the impedance parameter measurement mode.

11. The electrochemical impedance spectroscopy detection method according to claim 9, characterized in that: In the case that the vehicle further includes an OBC, and the OBC is connected to the battery module and the BMS respectively, the BMS controls the battery module to be in an impedance parameter test mode, including: Outputting a second control instruction from the BMS to the OBC; In response to the second control instruction, the OBC outputs the target excitation current to the battery module, so that the battery module is in the impedance parameter measurement mode.

12. The electrochemical impedance spectroscopy detection method according to claim 9, characterized in that: In a case where the battery module includes a first battery group, a second battery group and a DC-DC converter, and the DC-DC converter is connected to the BMS, the BMS controls the battery module to be in an impedance parameter test mode, including: The BMS outputs a third control instruction to the battery module; The DC-DC converter adjusts the voltage at the first end and the voltage at the second end of the DC-DC converter in response to the third control instruction, so that the first battery group outputs the target excitation current to the second battery group through the DC-DC converter, or the second battery group outputs the target excitation current to the first battery group, so that the battery module is in the impedance parameter measurement mode.

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