CN113805091A - Battery pack monitoring device, management system and vehicle - Google Patents
Battery pack monitoring device, management system and vehicle Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 94
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The present disclosure relates to a battery pack monitoring device, a management system, and a vehicle, including a multi-way switch selector: the circuit comprises an alternating current signal generator, an internal resistance monitoring operation instruction and a plurality of switches, wherein the alternating current signal generator is used for generating an alternating current signal according to the internal resistance monitoring operation instruction; alternating current signal generator: the device comprises a power supply, a power supply control module and a power supply module, wherein the power supply control module is used for generating a preset alternating current signal according to a first starting instruction and injecting the preset alternating current signal into a battery pack under the condition of receiving the first starting instruction; the internal resistance determining module is used for acquiring alternating voltage signals at two ends of the battery corresponding to the switch in a conducting state and determining the internal resistance of the battery corresponding to the switch in the conducting state according to the alternating voltage signals. Therefore, the working state of the battery pack cannot be interfered or damaged, factors influencing the monitoring precision of the internal resistance of the battery pack are reduced, the real-time monitoring of the internal resistance of the vehicle-mounted battery pack is facilitated, the evaluation process of the battery pack is simplified, and the energy consumption for evaluating the battery pack is reduced.
Description
Technical Field
The present disclosure relates to the field of battery packs, and in particular, to a battery pack monitoring device, a management system, and a vehicle.
Background
In the prior art, when a vehicle-mounted battery pack needs to be evaluated, the voltage, the current and the temperature of the vehicle-mounted battery pack are often required to be monitored, and a series of data such as the SOC and the SOH of the vehicle-mounted battery pack, the charge-discharge rate, the service efficiency and the service life of the vehicle-mounted battery pack are evaluated by combining a complex algorithm. The accuracy of the estimation of the method has higher requirement on the accuracy of the monitored voltage, current and temperature, and under the condition that the accuracy of the monitoring result is insufficient, the condition that the estimation deviation is large easily occurs. In addition, the estimation algorithm is complex, and the calculation amount is large, so the energy consumption is high.
The evaluation of indexes such as SOC, SOH, charging and discharging rate, efficiency and service life of the vehicle-mounted battery pack is closely related to the internal resistance of the vehicle-mounted battery pack, but the internal resistance of the vehicle-mounted battery pack cannot be monitored on line in real time in the prior art, so that the vehicle-mounted battery pack cannot be evaluated according to the internal resistance of the vehicle-mounted battery pack.
Disclosure of Invention
The purpose of the present disclosure is to provide a battery pack monitoring device, a management system, and a vehicle, which can monitor the dynamic internal resistance of a vehicle-mounted battery pack in real time, thereby achieving the purpose of evaluating the battery pack according to the internal resistance of the battery pack.
In order to achieve the above object, the present disclosure provides a battery pack monitoring apparatus including an alternating current signal generator, a multiplexer, and an internal resistance determining module, wherein,
the multi-way switch selector is used for sending a first starting instruction to the alternating current signal generator according to the internal resistance monitoring operation instruction under the condition of receiving the internal resistance monitoring operation instruction, wherein the multi-way switch selector comprises a plurality of switches, each switch is respectively connected with any one end of one battery in the battery pack, and the multi-way switch selector also controls the on-off of the switches according to the internal resistance monitoring operation instruction;
the alternating current signal generator is used for generating a preset alternating current signal according to the first starting instruction under the condition of receiving the first starting instruction, and injecting the preset alternating current signal into the battery pack;
the internal resistance determining module is used for acquiring alternating voltage signals at two ends of the battery corresponding to the switch in a conducting state, and determining the internal resistance of the battery corresponding to the switch in the conducting state according to the alternating voltage signals.
Optionally, the internal resistance monitoring operation instruction is further used for indicating a target frequency and a target amplitude of the preset alternating current signal;
the multi-way switch selector is further used for sending a second starting instruction for indicating the target frequency and the target amplitude of the preset alternating current signal to the alternating current signal generator according to the internal resistance monitoring operation instruction;
the alternating current signal generator is further configured to generate the preset alternating current signal according to the target frequency and the target amplitude indicated in the second start instruction.
Optionally, the apparatus further includes a preset capacitor, where the preset capacitor is disposed between the ac current signal generator and the battery pack, and is configured to separate a direct current in the preset ac current signal before the preset ac current signal generated by the ac current signal generator is injected into a battery corresponding to the switch in a conducting state.
Optionally, the internal resistance determining module includes a first filtering module, configured to filter out a direct-current voltage signal and a high-frequency noise signal from alternating-current voltage signals at two ends of the battery corresponding to the switch in the on state.
Optionally, the internal resistance determining module further includes an amplifying module, configured to amplify the filtered ac voltage signal.
Optionally, the internal resistance determining module includes a first analog-to-digital converter, configured to convert an alternating voltage signal across the battery corresponding to the switch in the conducting state from an analog signal form to a digital signal form.
Optionally, the internal resistance determining module further includes a first digital logic analyzing module, configured to analyze an ac voltage signal in the form of a digital signal output by the first analog-to-digital converter, so as to determine the internal resistance of the battery corresponding to the switch in the on state.
Optionally, the device further comprises a voltage monitoring module, a current monitoring module, a temperature monitoring module, and a monitoring data analysis module, wherein,
the multi-way switch selector is further used for sending a second starting instruction to the voltage monitoring module according to the received voltage monitoring operation instruction so as to obtain a voltage signal of a battery corresponding to the switch in a conducting state;
the multi-way switch selector is further used for sending a third opening instruction to the current monitoring module according to the received current monitoring operation instruction so as to obtain a current signal of a battery corresponding to the switch in a conducting state;
the multi-way switch selector is further used for sending a fourth starting instruction to the temperature monitoring module according to the received temperature monitoring operation instruction so as to obtain a temperature signal of the battery corresponding to the switch in a conducting state;
the monitoring data processing module is used for processing according to the voltage signal to obtain the voltage of the battery corresponding to the switch in a conducting state, or processing according to the current signal to obtain the current of the battery corresponding to the switch in the conducting state, or processing according to the temperature signal to obtain the temperature of the battery corresponding to the switch in the conducting state.
The present disclosure also provides a battery management system, comprising a communication module, a power module, a clock module and the monitoring device, wherein,
the communication module is used for acquiring an operation instruction of the controller and sending the operation instruction to the monitoring device;
the communication module is further configured to send at least one of an internal resistance, a voltage, a current, and a temperature of the battery corresponding to the switch in the on state, which is monitored by the device, to the controller;
the power supply module is used for providing power supply for the monitoring device;
the clock module is used for providing clock frequency for the monitoring device.
The present disclosure also provides a vehicle comprising the battery management system described above.
Through the technical scheme, when the internal resistance of the battery pack needs to be monitored, one or more batteries to be monitored can be determined by controlling the on-off of the switches at the two ends of each battery in the battery pack under the condition of not influencing the normal work of the battery pack, the batteries corresponding to the switches in the conducting state are injected after an alternating current signal is generated, and then the internal resistance of the batteries is determined according to the voltages at the two ends of the batteries corresponding to the switches in the conducting state, so that the normal work of the battery pack is not influenced, the working state of the battery pack is not interfered or damaged, the two are independent and not interfered with each other, factors influencing the monitoring precision of the internal resistance of the battery pack are reduced, a certain guarantee is provided for the monitoring precision of the internal resistance of the battery pack, the real-time monitoring of the internal resistance of the vehicle-mounted battery pack is facilitated, and the evaluation process of the battery pack is simplified, the power consumption for evaluating the battery pack is reduced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus according to an exemplary embodiment of the disclosure.
Fig. 2 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus according to yet another exemplary embodiment of the present disclosure.
Fig. 3 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus according to yet another exemplary embodiment of the present disclosure.
Fig. 4 is a block diagram illustrating a schematic structure of a battery management system according to yet another exemplary embodiment of the present disclosure.
Description of the reference numerals
1000 group battery management system 2000 group battery
100 battery monitoring device 10 multi-way switch selector
Internal resistance determining module of 20 alternating current signal generator 30
301 first filtering module 302 amplifying module
303 a first analog-to-digital converter 304 a first digital logic analysis module
40 voltage monitoring module 50 current monitoring module
60 temperature monitoring module 70 monitoring data processing module
200 communication module 300 power module
400 clock module
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus 100 according to an exemplary embodiment of the disclosure. As shown in fig. 1, the apparatus 100 includes an ac current signal generator 20, a multi-way switch selector 10 and an internal resistance determining module 30, where the multi-way switch selector 10 is configured to send a first turn-on instruction to the ac current signal generator 20 according to an internal resistance monitoring operation instruction when receiving the internal resistance monitoring operation instruction, where the multi-way switch selector 10 includes a plurality of switches, each of the switches is connected to any one end of a battery in a battery pack 2000, and the multi-way switch selector further controls on and off of each of the switches according to the internal resistance monitoring operation instruction. The ac current signal generator 20 is configured to generate a preset ac current signal according to the first start instruction and inject the preset ac current signal into the battery pack 2000 when the first start instruction is received. The internal resistance determining module 30 is configured to obtain ac voltage signals at two ends of the battery corresponding to the switch in the conducting state, and determine the internal resistance of the battery corresponding to the switch in the conducting state according to the ac voltage signals.
The multiplexer 10 may be a multiplexer (mux).
The internal resistance monitoring operation command may be issued from any relevant controller in the vehicle by sending the internal resistance monitoring operation command to the multiplexer 10 when there is a need to evaluate the battery pack 2000 and the internal resistance of the battery pack 2000 needs to be acquired.
After receiving the internal resistance monitoring operation command, the multiplexer 10 may selectively control the monitoring of a battery pack formed by one or more batteries in the battery pack 2000 by controlling the on/off of a plurality of switches respectively connected to two ends of different batteries in the battery pack according to the internal resistance monitoring operation command. And, according to the received internal resistance monitoring operation instruction, the ac current signal generator 20 may be turned on, and the first turn-on instruction is sent to the ac current signal generator 20, so that the ac current signal generator 20 generates the preset ac current signal.
The frequency and amplitude of the predetermined ac current signal are pre-selected to be set in the ac current signal generator 20. The frequency of the predetermined ac current signal is generally between 50HZ and 1KHZ, and the amplitude of the predetermined ac current signal is generally less than 5% of the operating current of the battery pack, for example, the operating current of a battery pack with a capacity of 100AH is 100A, and the amplitude of the predetermined ac current signal injected into the battery pack 2000 is less than 5A. Through the control to the frequency and the amplitude of this preset alternating current signal, can guarantee the safety of group battery 2000, for example because this preset alternating current signal's electric current is less, inject into group battery 2000 after, group battery 2000 discharge current is less, consequently can not produce the impact to group battery 2000 to can not cause grid plate deformation or the drop of mars material, can not cause the influence to group battery 2000's life yet.
After the predetermined ac current signal generated by the ac current signal generator 20 is injected into the battery pack 2000, the ac voltage signals at two ends of the battery pack 2000 may be input into the internal resistance determining module 30 through the multi-way switch selector 10, specifically, may be input through the switch in the conducting state between the battery pack 2000 and the multi-way switch selector 10, and the internal resistance determining module 30 determines the internal resistance of the battery corresponding to the switch in the conducting state according to the ac voltage signal in the battery corresponding to the switch in the conducting state.
Because the internal resistance monitoring operation instruction can be issued when the battery pack 2000 is in any working state, that is, by the above technical scheme, both the ohmic internal resistance and the polarization internal resistance of the battery pack 2000 can be monitored.
According to the technical scheme, when the internal resistance of the battery pack needs to be monitored, one or more batteries to be monitored can be determined by controlling the on-off of the switches at the two ends of each battery in the battery pack under the condition that the normal work of the battery pack is not influenced, the alternating current signals are injected into the batteries corresponding to the switches in the conducting state after being generated, and then the internal resistance of the batteries is determined according to the voltages at the two ends of the batteries corresponding to the switches in the conducting state. The mode has no influence on the normal work of the battery pack, does not interfere or damage the working state of the battery pack, is independent of each other and does not interfere with each other, and also reduces factors influencing the monitoring precision of the internal resistance of the battery pack, thereby providing a certain guarantee for the monitoring precision of the internal resistance of the battery pack, facilitating the real-time monitoring of the internal resistance of the vehicle-mounted battery pack, simplifying the evaluation process of the battery pack and reducing the energy consumption for evaluating the battery pack.
In a possible embodiment, the internal resistance monitoring operation instruction is further used for indicating a target frequency and a target amplitude of the preset alternating current signal. The multi-way switch selector 10 is further configured to send the second turn-on instruction for indicating the target frequency and the target amplitude of the preset alternating current signal to the alternating current signal generator 20 according to the internal resistance monitoring operation instruction. The alternating current signal generator 20 is further configured to generate the preset alternating current signal according to the target frequency and the target amplitude indicated in the second turn-on command.
That is, the alternating current signal generator 20 can generate the preset alternating current signal by the target frequency and the target amplitude indicated by the internal resistance monitoring operation instruction. Wherein the target frequency and the target amplitude indicated by the internal resistance monitoring operation command may be any one of a plurality of sets of frequencies and amplitudes that have been set in the alternating current signal generator 20 in advance.
For example, a plurality of sets of frequencies and amplitudes of the ac current signal may be preset in the ac current signal generator 20, a plurality of connection paths may be provided between the multiplexer 10 and the ac current signal generator 20, and the multiplexer 10 determines the connection path to be connected to the ac current signal generator 20 according to the target frequency and the target amplitude indicated by the internal resistance monitoring operation command, and sends the second open command to the ac current signal generator 20 through the connection path to indicate the preset target frequency and target amplitude of the ac current signal to the ac current signal generator 20.
The second opening command and the first opening command may be the same opening command.
Through the technical scheme, the relevant controller in the vehicle can determine the frequency and the amplitude of the alternating current signal injected into the battery pack when monitoring the internal resistance of the battery pack according to different states of the battery pack, wherein the states of the battery pack can comprise the working current of the battery pack and the like. Therefore, the accuracy of the internal resistance of the battery pack determined according to the alternating voltage signals at the two ends of the battery pack can be further improved, and the guarantee of the working safety of the battery pack can be further improved.
In a possible embodiment, the apparatus 100 further includes a preset capacitor (not shown) disposed between the ac current signal generator 20 and the battery pack 2000, for blocking dc in the preset ac current signal before the preset ac current signal generated by the ac current signal generator 20 is injected into the battery corresponding to the switch in the on state.
Through the technical scheme, the preset capacitor is also the direct current blocking capacitor, and the direct current part in the preset alternating current signal is blocked, so that the preset alternating current signal injected into the battery corresponding to the switch in the conducting state is more accurate, and the monitoring precision of the internal resistance of the battery corresponding to the switch in the conducting state is further ensured.
Fig. 2 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus 100 according to still another exemplary embodiment of the present disclosure. As shown in fig. 2, the internal resistance determining module 30 includes a first filtering module 301, configured to filter out a dc voltage signal and a high-frequency noise signal from ac voltage signals at two ends of the battery corresponding to the switch in the on state. The internal resistance determining module 30 further includes an amplifying module 302 for amplifying the filtered ac voltage signal.
The first filtering module 301 can filter out a low-frequency (dc) voltage signal in the ac voltage signal and a high-frequency noise signal generated during transmission of the ac voltage signal, so as to obtain the ac voltage signal within a certain frequency range, and then the accuracy of the internal resistance of the battery corresponding to the switch in the on state determined according to the filtered ac voltage signal will be greatly improved. The amplifying module 302 can be implemented by, for example, an operational amplifier, and can amplify the filtered ac voltage signal, so that the offset generated in the filtering process of the first filtering module 301 can be recovered by the amplifying module 302, so that the ac voltage signal after passing through the first filtering module 301 and the method module is more accurate.
In one possible embodiment, as shown in fig. 2, the internal resistance determination module 30 includes a first analog-to-digital converter 303 for converting the alternating voltage signal across the battery corresponding to the switch in the on state from an analog signal to a digital signal. The internal resistance determining module 30 further includes a first digital logic analyzing module 304, configured to analyze the ac voltage signal in the form of the digital signal output by the first analog-to-digital converter 303, so as to determine the internal resistance of the battery corresponding to the switch in the conducting state.
Through the technical scheme, the first digital logic analysis module 304 can effectively overcome the influence on the internal resistance precision caused by current interference in the working process of the battery pack, and can suppress errors caused by interference and noise in the circuit through the first filtering module 301, so that the monitoring device not only can accurately monitor the internal resistance of the battery corresponding to the switch in a conducting state, but also has better anti-interference capability.
Fig. 3 is a block diagram illustrating a schematic structure of a battery pack monitoring apparatus 100 according to still another exemplary embodiment of the present disclosure. The device 100 further includes a voltage monitoring module 40, a current monitoring module 50, a temperature monitoring module 60, and a monitoring data analysis module, wherein the multi-way switch selector 10 is further configured to send a third opening instruction to the voltage monitoring module 40 according to the received voltage monitoring operation instruction, so as to obtain a voltage signal of a battery corresponding to the switch in the on state; the multi-way switch selector 10 is further configured to send a fourth switching instruction to the current monitoring module 50 according to the received current monitoring operation instruction, so as to obtain a current signal of the battery corresponding to the switch in the on state; the multi-way switch selector 10 is further configured to send a fifth start instruction to the temperature monitoring module 60 according to the received temperature monitoring operation instruction, so as to obtain a temperature signal of the battery corresponding to the switch in the on state; the monitoring data processing module 70 is configured to obtain a voltage of the battery corresponding to the switch in the conducting state according to the voltage signal processing, obtain a current of the battery corresponding to the switch in the conducting state according to the current signal processing, or obtain a temperature of the battery corresponding to the switch in the conducting state according to the temperature signal processing.
That is, the monitoring device 100 can also monitor the voltage, the current, and the temperature of the battery corresponding to the switch in the on state through the voltage monitoring module 40, the current monitoring module 50, and the temperature monitoring module 60, respectively. The multi-way switch selector 10 is respectively communicated with different monitoring modules under the condition of receiving corresponding operation instructions to obtain corresponding voltage signals, current signals or temperature signals, and then data processing is uniformly performed through the monitoring data processing module 70.
The monitoring data processing module 70 may also include, for example, a second analog-to-digital converter (not shown), a second filtering module (not shown), and a second digital logic analyzing module (not shown), which are respectively configured to convert the voltage signal, the current signal, or the temperature signal in the analog signal form into a voltage signal, a current signal, or a temperature signal in the digital signal form, then filter the converted digital signal, and finally determine the voltage, the current, or the temperature, etc. of the battery corresponding to the switch in the on state through the filtered voltage signal, the current signal, or the temperature signal in the digital signal form.
Fig. 4 is a block diagram illustrating a schematic structure of a battery management system according to yet another exemplary embodiment of the present disclosure. As shown in fig. 4, the battery pack management system includes a communication module 200, a power module 300, a clock module 400 and the monitoring device 100, where the communication module 200 is configured to obtain an operation instruction of a controller and send the operation instruction to the monitoring device 100; the communication module 200 is further configured to send at least one of an internal resistance, a voltage, a current, and a temperature of the battery corresponding to the switch in the on state, which is obtained by monitoring by the device, to the controller; the power module 300 is used for providing power for the monitoring device 100; the clock module 400 is used to provide a clock frequency for the monitoring device 100.
That is, the communication module 200 is used for communication between the battery management system 1000 and other devices in the vehicle, and the internal resistance monitoring operation instruction, the voltage monitoring operation instruction, the current monitoring operation instruction, and the temperature monitoring operation instruction may be sent to the communication module 200 by the controller, and then forwarded to the multiplexer 10 in the monitoring device 100 by the communication module 200. When the controller in the vehicle needs to evaluate the vehicle battery pack 2000, the communication module 200 may also obtain information such as internal resistance, voltage, current, and temperature of the battery corresponding to the switch in the on state, which is determined by the monitoring device 100.
In addition, the preset frequency and amplitude of the preset ac current signal in the ac current signal generator 20 can also be set by the communication module 200.
The present disclosure also provides a vehicle including the battery management system 1000 described above.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A battery pack monitoring apparatus, comprising an alternating current signal generator, a multi-way switch selector, and an internal resistance determination module, wherein,
the multi-way switch selector is used for sending a first starting instruction to the alternating current signal generator according to the internal resistance monitoring operation instruction under the condition of receiving the internal resistance monitoring operation instruction, wherein the multi-way switch selector comprises a plurality of switches, each switch is respectively connected with any one end of one battery in the battery pack, and the multi-way switch selector also controls the on-off of each switch according to the internal resistance monitoring operation instruction;
the alternating current signal generator is used for generating a preset alternating current signal according to the first starting instruction under the condition of receiving the first starting instruction, and injecting the preset alternating current signal into the battery pack;
the internal resistance determining module is used for acquiring alternating voltage signals at two ends of the battery corresponding to the switch in a conducting state, and determining the internal resistance of the battery corresponding to the switch in the conducting state according to the alternating voltage signals.
2. The apparatus of claim 1, wherein the internal resistance monitoring operation instructions are further configured to indicate a target frequency and a target amplitude of the preset ac current signal;
the multi-way switch selector is further used for sending a second starting instruction for indicating the target frequency and the target amplitude of the preset alternating current signal to the alternating current signal generator according to the internal resistance monitoring operation instruction;
the alternating current signal generator is further configured to generate the preset alternating current signal according to the target frequency and the target amplitude indicated in the second start instruction.
3. The apparatus according to claim 1 or 2, further comprising a predetermined capacitor disposed between the ac current signal generator and the battery pack for blocking dc in the predetermined ac current signal before the predetermined ac current signal generated by the ac current signal generator is injected into the battery corresponding to the switch in the on state.
4. The apparatus according to claim 1 or 2, wherein the internal resistance determining module comprises a first filtering module for filtering out a dc voltage signal and a high frequency noise signal from the ac voltage signal across the battery corresponding to the switch in the on state.
5. The apparatus of claim 4, wherein the internal resistance determining module further comprises an amplifying module for amplifying the filtered AC voltage signal.
6. The apparatus according to claim 1 or 2, wherein the internal resistance determining module comprises a first analog-to-digital converter for converting the alternating voltage signal across the battery corresponding to the switch in the on state from an analog signal to a digital signal.
7. The apparatus of claim 6, wherein the internal resistance determining module further comprises a first digital logic analyzing module for analyzing the AC voltage signal in the form of a digital signal output by the first analog-to-digital converter to determine the internal resistance of the battery corresponding to the switch in the ON state.
8. The device of claim 1, further comprising a voltage monitoring module, a current monitoring module, a temperature monitoring module, a monitoring data analysis module, wherein,
the multi-way switch selector is further used for sending a second starting instruction to the voltage monitoring module according to the received voltage monitoring operation instruction so as to obtain a voltage signal of a battery corresponding to the switch in a conducting state;
the multi-way switch selector is further used for sending a third opening instruction to the current monitoring module according to the received current monitoring operation instruction so as to obtain a current signal of a battery corresponding to the switch in a conducting state;
the multi-way switch selector is further used for sending a fourth starting instruction to the temperature monitoring module according to the received temperature monitoring operation instruction so as to obtain a temperature signal of the battery corresponding to the switch in a conducting state;
the monitoring data processing module is used for processing according to the voltage signal to obtain the voltage of the battery corresponding to the switch in a conducting state, or processing according to the current signal to obtain the current of the battery corresponding to the switch in the conducting state, or processing according to the temperature signal to obtain the temperature of the battery corresponding to the switch in the conducting state.
9. A battery management system comprising a communication module, a power module, a clock module and a monitoring device according to any one of claims 1 to 8,
the communication module is used for acquiring an operation instruction of the controller and sending the operation instruction to the monitoring device;
the communication module is further configured to send at least one of an internal resistance, a voltage, a current, and a temperature of the battery corresponding to the switch in the on state, which is monitored by the device, to the controller;
the power supply module is used for providing power supply for the monitoring device;
the clock module is used for providing clock frequency for the monitoring device.
10. A vehicle characterized by comprising the battery management system of claim 9.
Priority Applications (1)
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