CN118011226A - Lithium ion battery detection chip and detection device - Google Patents
Lithium ion battery detection chip and detection device Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 148
- 238000001514 detection method Methods 0.000 title claims abstract description 130
- 230000004044 response Effects 0.000 claims abstract description 114
- 230000005284 excitation Effects 0.000 claims abstract description 56
- 238000012545 processing Methods 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims abstract description 29
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 53
- 230000003321 amplification Effects 0.000 claims description 30
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 18
- 239000000872 buffer Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000013500 data storage Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 3
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 46
- 238000010586 diagram Methods 0.000 description 8
- 238000001453 impedance spectrum Methods 0.000 description 8
- 238000007726 management method Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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Abstract
The application provides a lithium ion battery detection chip and a detection device, wherein the detection chip comprises: the excitation signal generation module carries out frequency sweep processing in a target frequency sweep interval to obtain a current excitation signal corresponding to each frequency, the current excitation signal is used for exciting the lithium ion battery to generate response voltage, response current and direct current, and the response voltage and the response current of each frequency are amplified, anti-aliasing filtered, analog-to-digital converted, band-pass filtered and discrete Fourier transformed through the EIS data detection module to obtain a discrete value of the response current and a discrete value of the response voltage; and determining impedance values of corresponding frequencies, wherein the detection and temperature measurement module determines battery voltage and battery temperature based on direct current voltage according to EIS data determined by a plurality of impedance values of a target sweep interval, and the current detection and monitoring module determines battery current based on working current. The detection chip provided by the application can accurately and efficiently detect the EIS data of the lithium ion battery, and other equipment is not needed.
Description
Technical Field
The invention relates to the field of battery management, in particular to a lithium ion battery detection chip and a detection device.
Background
The wide application of lithium ion batteries in the fields of electric automobiles, mobile devices and the like makes the demands on battery performance and safety increasingly important. The mainstream BMS (Battery MANAGEMENT SYSTEM) chip generally has only the function of detecting basic physical quantities such as voltage, current and surface temperature, which are insufficient to accurately restore and identify complex electrochemical and mechanical behaviors inside the Battery, so that the Battery working state cannot be accurately controlled from the data source, and potential safety hazards such as energy unbalance and thermal runaway cannot be blocked, so that urgent requirements of safety precaution are difficult to meet. The electrochemical impedance spectrum data (Electrochemical Impedance Spectroscopy, EIS) covers multi-scale data information from the internal physical and chemical properties, electrochemical reaction and aging mechanism of the micro-scale lithium battery to the electrical characteristics and thermal characteristics of the macro-scale lithium battery, can realize multi-dimensional characterization of the electrode state, and is a very effective lithium ion battery detection means. However, the current EIS technology in the art generally adopts an offline experiment or a complex instrument to obtain the electrochemical impedance spectrum, which limits the feasibility and effectiveness of real-time monitoring, and cannot directly and accurately obtain the electrochemical impedance spectrum data inside the battery, so that potential safety hazards exist in monitoring the lithium ion battery, and the experience of customers on related products is reduced.
Therefore, how to provide a solution for rapidly and effectively detecting EIS data of a lithium ion battery is a technical problem to be solved.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a lithium ion battery detection chip and a detection device, so as to solve at least one of the above-mentioned technical problems.
In order to achieve the above and other related objects, the present application provides the following technical solutions.
According to an aspect of an embodiment of the present application, there is provided a lithium ion battery detection chip including:
the excitation signal generation module is used for carrying out frequency sweep processing in a target frequency sweep interval to obtain a current excitation signal corresponding to each frequency, wherein the current excitation signal is used for exciting the lithium ion battery so as to generate response voltage, response current and direct current voltage;
The input end of the EIS data detection module is connected with the response voltage and the response current, the impedance value corresponding to each frequency is obtained during frequency sweep, and EIS data is determined based on a plurality of impedance values of the target frequency sweep interval; the process of obtaining the impedance value corresponding to each frequency comprises the following steps: amplifying, anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transformation are respectively carried out on the response voltage and the response current to obtain a discrete value of the response voltage and a discrete value of the response current, and an impedance value of a corresponding frequency is determined according to the discrete value of the response voltage and the discrete value of the response current;
the input end of the voltage and temperature detection module is connected with the direct-current voltage, analog-to-digital conversion is carried out on the direct-current voltage to obtain battery voltage, and temperature test is carried out according to the direct-current voltage to obtain battery temperature;
the input end of the current detection and monitoring module is connected with the working current of the lithium ion battery, the working current is subjected to analog-to-digital conversion to obtain battery current, and a monitoring signal is generated according to the working current and a preset abnormal current;
And the input end of the data processing module is connected with the EIS data, the battery voltage, the battery temperature and the monitoring signal, performs data storage on the EIS data, the battery voltage and the battery temperature, updates a battery control signal according to the EIS data so as to switch the lithium ion battery acted by the current excitation signal, and controls the charging and discharging of the lithium ion battery based on the monitoring signal.
Optionally, the excitation signal generating module includes a waveform generator, a first digital-to-analog converter, a first amplifier and a buffer, where the waveform generator performs sweep frequency processing in the target sweep frequency interval based on a driving signal to obtain a plurality of digital signals with different frequencies, inputs the digital signals into the first digital-to-analog converter, performs digital-to-analog conversion on the digital signals through the first digital-to-analog converter to obtain analog signals, inputs the analog signals into the first amplifier, amplifies the analog signals through the first amplifier to obtain amplified analog signals, inputs the amplified analog signals into the buffer, buffers the amplified analog signals through the buffer, and externally outputs a plurality of current excitation signals with different frequencies.
Optionally, the EIS data detection module includes a signal amplification processing unit, a first filter, a first analog-to-digital converter, a second filter, and a discrete fourier transform, where an input end of the signal amplification processing unit is connected to the response voltage and the response current, and performs current amplification processing on the response current first, and then performs voltage amplification processing on the response voltage to obtain amplified response voltage and response current under each frequency, an output end of the signal amplification processing unit is connected to the first filter, an output end of the first filter is connected to an input end of the first analog-to-digital converter, an output end of the first analog-to-digital converter is connected to an input end of the second filter, and an output end of the second filter is connected to an input end of the discrete fourier transform, and performs anti-aliasing filtering, analog-to-digital conversion, band-pass filtering, and discrete fourier transform on the amplified response voltage and response current to obtain a discrete value of the response current and a discrete value of the response voltage.
Optionally, the signal amplification processing unit includes a first selector, a second amplifier, and a third amplifier, where an input end of the first selector collects the response voltage and the response current at each frequency, and the second amplifier is turned on and the third amplifier is turned off by the first selector and the second selector, and the response current is subjected to current amplification processing to obtain amplified response current at each frequency; the first selector and the second selector close the second amplifier and open the third amplifier, and voltage amplification processing is carried out on the response voltage to obtain amplified response voltage under each frequency; the first output end of the first selector is connected with the first input end of the second amplifier, the second input end of the second amplifier is connected with the reference voltage, the first output end of the first selector is also connected with the first input end of the third amplifier, the second output end of the first selector is connected with the second input end of the third amplifier, the output end of the second amplifier is connected with the second selector, and the output end of the third amplifier is connected with the second selector.
Optionally, the voltage and temperature detection module includes a third selector, a second analog-to-digital converter and a temperature sensor, the direct current voltage is collected through the third selector, the output end of the temperature sensor is connected with the input end of the third selector, the temperature signal is obtained by detecting the temperature of the direct current voltage based on the temperature sensor, the output end of the third selector is connected with the input end of the second analog-to-digital converter, and the direct current voltage and the temperature signal are subjected to analog-to-digital conversion through the second analog-to-digital converter, so that the battery voltage and the battery temperature are obtained.
Optionally, the current detecting and monitoring module includes a third analog-to-digital converter and a current protection unit, the input end of the third analog-to-digital converter is connected with the working current, the third analog-to-digital converter performs analog-to-digital conversion on the working current to obtain the battery current, the input end of the current protection unit is connected with the working current, and the working current and the preset abnormal current are detected by the current protection unit to obtain the monitoring signal.
According to another aspect of the embodiment of the present application, there is also provided a lithium ion battery detection apparatus, including: the lithium ion battery detection chip, the amplification selection module, the lithium ion battery module and the current detection module are described above;
The amplifying and selecting module is connected with the current excitation signal and the battery control signal, and is used for controlling the switching of the lithium ion battery acted on the current excitation signal according to the battery control signal;
The lithium ion battery module is connected with the current excitation signal and generates the response voltage, the response current and the direct current voltage based on the current excitation signal;
the current detection module is connected with the lithium ion battery module and working voltage, and generates the working current based on the working voltage.
Optionally, the amplifying and selecting module includes a fourth amplifier and a fourth selector, where an input end of the fourth amplifier is connected to the current excitation signal, an output end of the fourth amplifier is connected to an input end of the fourth selector, a control end of the fourth selector is connected to the battery control signal, and the fourth selector closes a switch of a corresponding branch of the lithium ion battery acted by the current excitation signal according to the battery control signal.
Optionally, the lithium ion battery module includes N lithium ion batteries and 2n+1 capacitors, one end of each of the i lithium ion batteries is connected to an output end of the fourth selector, an anode of each of the i lithium ion batteries is connected to an anode of the working voltage, an anode of each of the i lithium ion batteries is connected to another end of each of the i lithium ion batteries, the anode of each of the i lithium ion batteries is further connected to the voltage and temperature detection module, the anode of each of the i lithium ion batteries is further connected to the EIS data detection module after being connected to the i+n capacitors in series, a cathode of each of the i lithium ion batteries is further connected to the EIS data detection module after being connected to the i+n+1 capacitors in series, and a cathode of each of the i lithium ion batteries is further connected to an anode of the next lithium ion battery, and a cathode of each of the i lithium ion batteries is further connected to the ground, wherein N is a positive integer greater than or equal to 1, and N is less than or equal to 0.
Optionally, the current detection module includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, and a third resistor, where one end of the first capacitor is connected to one end of the second capacitor, one end of the first capacitor is connected to one end of the second resistor after being connected in series with the first resistor, one end of the second resistor is grounded, the other end of the first capacitor is grounded, the other end of the second capacitor is connected to the ground after being connected to the third capacitor, and the other end of the second capacitor is connected to the other end of the second resistor after being connected to the third resistor, where the working current flows through the second resistor.
The application provides a lithium ion battery detection chip and a detection device, wherein the detection chip comprises: carrying out frequency sweep processing in a target frequency sweep interval through an excitation signal generation module to obtain a current excitation signal corresponding to each frequency, wherein the current excitation signal is used for exciting a lithium ion battery to generate response voltage, response current and direct current, and amplifying, anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transformation are carried out on the response voltage and the response current of each frequency through an EIS data detection module to obtain a discrete value of the response current and a discrete value of the response voltage; and determining impedance values of corresponding frequencies, performing module conversion and temperature test on the direct current voltage through a detection and temperature measurement module according to EIS data determined by a plurality of impedance values of a target sweep frequency interval to obtain battery voltage and battery temperature, and performing analog-to-digital conversion on working current through a current detection and monitoring module to obtain battery current. The lithium ion battery detection signal and the detection device provided by the application realize the detection of the voltage, the EIS data, the current and the temperature of the lithium ion battery, and especially the detection of the EIS data of the lithium ion battery is accurate and efficient, and the electrochemical impedance spectrum is not required to be detected by an offline experiment or a complex instrument, so that the battery management system can detect the battery more intelligently and accurately; meanwhile, the architecture design of the detection device simplifies the external connection circuit of the battery, reduces the complexity of system design and deployment and reduces the production cost.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
fig. 1 is a block diagram of a lithium ion battery detection chip according to an exemplary embodiment of the present invention;
FIG. 2 is a specific architecture diagram of an excitation signal generation module shown in an exemplary embodiment of the invention;
fig. 3 is a specific architecture diagram of a lithium ion battery detection chip according to an exemplary embodiment of the present invention;
fig. 4 is a specific structural view of a lithium ion battery detection apparatus according to an exemplary embodiment of the present invention;
Reference numerals: ① -an amplification selection module, ② lithium ion battery module, ③ -a current detection module, ④ -a charge-discharge module.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In the following description, numerous details are set forth in order to provide a more thorough explanation of embodiments of the present invention, it will be apparent, however, to one skilled in the art that embodiments of the present invention may be practiced without these specific details, in other embodiments, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the embodiments of the present invention.
The wide application of lithium ion batteries in the fields of electric automobiles, mobile devices and the like makes the demands on battery performance and safety increasingly important. The mainstream BMS (Battery MANAGEMENT SYSTEM) chip generally has only the function of detecting basic physical quantities such as voltage, current and surface temperature, which are insufficient to accurately restore and identify complex electrochemical and mechanical behaviors inside the Battery, so that the Battery working state cannot be accurately controlled from the data source, and potential safety hazards such as energy unbalance and thermal runaway cannot be blocked, so that urgent requirements of safety precaution are difficult to meet. The electrochemical impedance spectrum data (Electrochemical Impedance Spectroscopy, EIS) covers multi-scale data information from the internal physical and chemical properties, electrochemical reaction and aging mechanism of the micro-scale lithium battery to the electrical characteristics and thermal characteristics of the macro-scale lithium battery, can realize multi-dimensional characterization of the electrode state, and is a very effective lithium ion battery detection means. However, the current EIS technology in the art generally adopts an offline experiment or a complex instrument to obtain the electrochemical impedance spectrum, which limits the feasibility and effectiveness of real-time monitoring, and cannot directly and accurately obtain the electrochemical impedance spectrum data inside the battery, so that potential safety hazards exist in monitoring the lithium ion battery, and the experience of customers on related products is reduced.
Referring to fig. 1, fig. 1 is a block diagram of a lithium ion battery detection chip according to an exemplary embodiment of the invention.
As shown in fig. 1, in an exemplary embodiment, a lithium ion battery detection chip includes:
The excitation signal generation module is used for carrying out frequency sweep processing in a target frequency sweep interval to obtain a current excitation signal corresponding to each frequency, wherein the current excitation signal is used for exciting the lithium ion battery so as to generate response voltage, response current and direct current voltage;
The EIS data detection module is connected with the response voltage and the response current at the input end, acquires an impedance value corresponding to each frequency during frequency sweep, and determines EIS data based on a plurality of impedance values of a target frequency sweep interval; the process of obtaining the impedance value corresponding to each frequency comprises the following steps: amplifying, anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transformation are respectively carried out on the response voltage and the response current to obtain a discrete value of the response voltage and a discrete value of the response current, and an impedance value of a corresponding frequency is determined according to the discrete value of the response voltage and the discrete value of the response current;
The input end of the voltage and temperature detection module is connected with the direct-current voltage, analog-digital conversion is carried out on the direct-current voltage to obtain battery voltage, and temperature test is carried out according to the direct-current voltage to obtain battery temperature;
the input end of the current detection and monitoring module is connected with the working current of the lithium ion battery, the working current is subjected to analog-to-digital conversion to obtain the battery current, and a monitoring signal is generated according to the working current and a preset abnormal current;
And the input end of the data processing module is connected with the EIS data, the battery voltage, the battery temperature and the monitoring signal, performs data storage on the EIS data, the battery voltage and the battery temperature, updates the battery control signal according to the EIS data so as to switch the lithium ion battery acted by the current excitation signal, and controls the charging and discharging of the lithium ion battery based on the monitoring signal.
Referring to fig. 2, fig. 2 is a specific architecture diagram of an excitation signal generation module according to an exemplary embodiment of the present invention.
In detail, the excitation signal generation module includes a waveform generator waveform generator, a first digital-to-analog converter HSDAC, a first amplifier GAIN and a buffer EXCITATION BUFFER, the waveform generator waveform generator performs sweep frequency processing in a target sweep frequency interval based on a driving signal to obtain a plurality of digital signals with different frequencies, the digital signals are input into the first digital-to-analog converter HSDAC, the digital signals are digital-to-analog converted through the first digital-to-analog converter HSDAC to obtain analog signals, the analog signals are input into the first amplifier GAIN, the analog signals are amplified through the first amplifier GAIN to obtain amplified analog signals, the amplified analog signals are input into the buffer EXCITATION BUFFER, the amplified analog signals are buffered through the buffer EXCITATION BUFFER, and the plurality of current excitation signals with different frequencies are output.
Referring to fig. 3, fig. 3 is a specific architecture diagram of a lithium ion battery detection chip according to an exemplary embodiment of the present invention.
In detail, as shown in fig. 3, the EIS data detection module includes a signal amplification processing unit, a first filter AAF, a first analog-to-digital converter adc_1, a second filter BPF, and a discrete fourier transform DFT, where an input end of the signal amplification processing unit is connected to a response voltage and a response current, and the response current is subjected to current amplification processing first, and then is amplified to obtain a response voltage and a response current amplified at each frequency, an output end of the signal amplification processing unit is connected to the first filter AAF, an output end of the first filter AAF is connected to an input end of the first analog-to-digital converter adc_1, an output end of the first analog-to-digital converter adc_1 is connected to an input end of the second filter BPF, an output end of the second filter BPF is connected to an input end of the discrete fourier transform DFT, and anti-aliasing filtering, analog-to-digital conversion, band-pass filtering, and discrete fourier transform are performed on the amplified response current and the response voltage, so as to obtain a discrete value of the response current and a discrete value of the response voltage.
In detail, as shown in fig. 3, the signal amplification processing unit includes a first selector mux_1, a second selector mux_2, a second amplifier HSTIA, and a third amplifier PGA, wherein the input end of the first selector mux_1 collects a response voltage and a response current at each frequency, and the first selector mux_1 and the second selector mux_2 turn on the second amplifier HSTIA and turn off the third amplifier PGA to perform current amplification processing on the response current to obtain an amplified response current at each frequency; the first selector MUX_1 and the second selector MUX_2 are used for closing the second amplifier HSTIA and opening the third amplifier PGA, and voltage amplification processing is carried out on the response voltage to obtain amplified response voltage under each frequency; the first output end of the first selector mux_1 is connected with the first input end of the second amplifier HSTIA, the second input end of the second amplifier HSTIA is connected with the reference voltage, the first output end of the first selector mux_1 is also connected with the first input end of the third amplifier PGA, the second output end of the first selector mux_1 is connected with the second input end of the third amplifier PGA, the output end of the second amplifier HSTIA is connected with the second selector mux_2, and the output end of the third amplifier PGA is connected with the second selector mux_2.
Specifically, the voltage and temperature detection module includes a third selector mux_3, a second analog-to-digital converter adc_2, and a temperature sensor, the dc voltage is collected by the third selector mux_3, the output end of the temperature sensor is connected to the input end of the third selector mux_3, the temperature signal is obtained by detecting the temperature of the dc voltage based on the temperature sensor, the output end of the third selector mux_3 is connected to the input end of the second analog-to-digital converter adc_2, and the dc voltage and the temperature signal are subjected to analog-to-digital conversion by the second analog-to-digital converter adc_2, so as to obtain the battery voltage and the battery temperature.
In detail, the current detection and monitoring module comprises a third analog-to-digital converter ADC_3 and a current protection unit, wherein the input end of the third analog-to-digital converter ADC_3 is connected with working current, the third analog-to-digital converter ADC_3 performs analog-to-digital conversion on the working current to obtain battery current, the input end of the current protection unit is connected with the working current, and the working current and the preset abnormal current are detected through the current protection unit to obtain a monitoring signal.
In detail, as shown in fig. 3, the detection chip further includes a communication module, a voltage stabilizing module, and a driving protection module, where the passing module is used to perform data transmission on detected EIS data, battery temperature, battery voltage, and battery current, so as to transmit the data to an external central processing unit for data processing; the driving protection module receives the detection signal processed by the data processing module and generates a charging signal and a discharging signal which are used for controlling the charging and discharging of the lithium ion battery; the voltage stabilizing module is used for starting the detection chip and stabilizing the operation between the internal modules.
Referring to fig. 4, fig. 4 is a specific structural diagram of a lithium ion battery detection device according to an exemplary embodiment of the present invention.
As shown in fig. 4, the present application further provides a lithium ion battery detection device, which is characterized by comprising: the lithium ion battery detection chip, the amplification selection module, the lithium ion battery module and the current detection module are as described above;
the amplifying and selecting module is connected with the current excitation signal and the battery control signal, and performs switching control on the lithium ion battery acted by the current excitation signal according to the battery control signal;
the lithium ion battery module is connected with a current excitation signal, and generates response voltage, response current and direct current voltage based on the current excitation signal;
the current detection module is connected with the lithium ion battery module and the working voltage and generates working current based on the working voltage.
Specifically, the amplifying and selecting module includes a fourth amplifier AMP and a fourth selector mux_4, the input end of the fourth amplifier AMP is connected to the current excitation signal, the output end of the fourth amplifier AMP is connected to the input end of the fourth selector mux_4, the control end of the fourth selector mux_4 is connected to the battery control signal, and the fourth selector mux_4 closes the switch of the corresponding branch of the lithium ion battery acted by the current excitation signal according to the battery control signal, and selects one lithium ion battery for signal excitation.
The lithium ion battery module comprises N lithium ion batteries and 2N+1 capacitors, one end of the ith capacitor is connected with the output end of the fourth selector, the anode of the first lithium ion battery is connected with the anode of the next lithium ion battery, the anode of the ith lithium ion battery is connected with the other end of the ith capacitor, the anode of the ith lithium ion battery is further connected with the voltage and temperature detection module, the anode of the ith lithium ion battery is further connected with the EIS data detection module after being connected with the (i+N) th capacitor in series, the cathode of the ith lithium ion battery is further connected with the EIS data detection module after being connected with the (i+N+1) th capacitor in series, the cathode of the ith lithium ion battery is further connected with the anode of the next lithium ion battery, and the cathode of the (N) th lithium ion battery is further grounded, wherein N is a positive integer greater than or equal to 1, and i is a positive integer greater than or equal to 0. Specifically, AS shown in fig. 4, when the number of lithium ion batteries is 5 and the number of capacitors is 11, the anode of the first lithium ion battery is connected with the positive electrode of the working voltage pack+, when i is 1, the anode of the first lithium ion battery U1 is connected with the other end of the first capacitor C1, the anode of the first lithium ion battery U1 is also connected with the voltage and temperature detection module through a VC pin, the anode of the first lithium ion battery U1 is also connected with the EIS data detection module through an AS pin after being connected with a sixth capacitor C6 in series, the cathode of the first lithium ion battery U1 is connected with the voltage and temperature detection module through a VC pin, the cathode of the first lithium ion battery U1 is also connected with the EIS data detection module through an AS pin after being connected with a seventh capacitor C7 in series, and the cathode of the first lithium ion battery U1 is also connected with the anode of the second lithium ion battery U2; when the voltage is 3, the anode of the third lithium ion battery U3 is connected with the other end of the third capacitor C3, the anode of the third lithium ion battery U3 is also connected with the voltage and temperature detection module through a VC pin, the anode of the third lithium ion battery U3 is also connected with the EIS data detection module through an AS pin after being connected with an eighth capacitor C8 in series, the cathode of the third lithium ion battery U3 is connected with the voltage and temperature detection module through a VC pin, the cathode of the third lithium ion battery U3 is also connected with the EIS data detection module through an AS pin after being connected with a ninth capacitor C9 in series, and the cathode of the third lithium ion battery U3 is also connected with the anode of the fourth lithium ion battery U4; the connection relationship between the second lithium ion battery and the fourth lithium ion battery is the same as that between the third lithium ion battery, so that the description is omitted here; when the voltage is 5, the anode of the fifth lithium ion battery U5 is connected with the other end of the fifth capacitor C5, the anode of the fifth lithium ion battery U5 is also connected with the voltage and temperature detection module through a VC pin, the anode of the fifth lithium ion battery U5 is also connected with the EIS data detection module through an AS pin after being connected with the tenth capacitor C10 in series, the cathode of the fifth lithium ion battery U5 is connected with the voltage and temperature detection module through a VC pin, the cathode of the fifth lithium ion battery U5 is also connected with the EIS data detection module through an AS pin after being connected with the eleventh capacitor C11 in series, and the cathode of the fifth lithium ion battery U5 is also grounded.
In detail, as shown in fig. 4, the current detection module includes a first capacitor C12, a second capacitor C13, a third capacitor C14, a first resistor R1, a second resistor R2, and a third resistor R3, one end of the first capacitor C12 is connected to one end of the second capacitor C13, one end of the first capacitor C1 is further connected to one end of the second resistor R2 after passing through the first resistor R1 connected in series, one end of the second resistor R2 is further grounded, the other end of the first capacitor C12 is grounded, the other end of the second capacitor C13 is connected to the ground after passing through the third capacitor C14 connected in series, and the other end of the second capacitor C13 is further connected to the other end of the second resistor R2 after passing through the third resistor R3 connected in series, wherein an operating current flows through the second resistor R2.
In detail, as shown in fig. 4, the detection state further includes a charge-discharge module, where the charge-discharge module includes a fourth resistor R4, a fifth resistor R5, a first diode D1, a first NMOS transistor Q1, a second NMOS transistor Q2, and a first PMOS transistor Q3, the gate of the first NMOS transistor Q1 is connected to the source of the first NMOS transistor Q1 after passing through the fourth resistor R4 in series, the drain of the first NMOS transistor Q1 is connected to the drain of the second NMOS transistor Q2, the gate of the second NMOS transistor Q2 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the gate of the first PMOS transistor Q3, the drain of the first PMOS transistor Q3 is connected to the cathode of the first diode D1 after passing through the fifth resistor R5 in series, where the gate of the first NMOS transistor Q1 is connected to the charge-discharge interface sub-module, the source of the second NMOS transistor Q2 is connected to the negative electrode of the operating voltage, and the source of the first PMOS transistor Q3 is connected to the charge-discharge interface sub-module.
As shown in fig. 4, the detection device further includes a central processing unit T2, an initial starting module and an external temperature testing module, where the central processing unit T2 acquires detected EIS data, battery temperature, battery voltage, battery current and other data through an SCL pin and an SDA pin, the initial starting module is connected with a voltage stabilizing module of the detection chip through a BAT pin, the BAT pin is connected with a highest voltage end of the lithium ion battery module after passing through a serially connected sixth resistor R6, the external temperature testing module is used for combining with a temperature sensor in the detection chip to test the temperature, the external temperature testing module includes a temperature-sensitive resistor TR and a seventh resistor R7, one end of the temperature-sensitive resistor TR is grounded, the other end of the temperature-sensitive resistor is connected with a power supply voltage VCC after passing through the serially connected seventh resistor R7, and the other end of the temperature-sensitive resistor TR is also connected with a TS1 pin.
Referring to fig. 1 to 4, the working principle of the lithium ion battery detection device provided by the application is as follows:
The method comprises the steps of generating a waveform generator waveform generator in an excitation signal generation module to scan in a target sweep frequency region (the frequency range is1 kHz-10 kHz) to obtain a plurality of digital signals with different frequencies, inputting each digital signal into a first digital-to-analog converter HSDAC, a first amplifier GAIN and a buffer EXCITATION BUFFER in sequence after the digital signal is generated by the waveform generator waveform generator and is subjected to digital signals with the frequency of 10kHz, 9kHz and … … kHz, outputting a stable current excitation signal through an ES pin of a detection chip T1 to the outside after the digital signals are sequentially input into an EIS data detection module of the detection chip T1, inputting the current excitation signal into an amplification selection module through a fourth amplifier AMP, amplifying the current excitation signal into a corresponding lithium ion battery in the lithium ion battery module according to a battery control signal output by the detection chip T1, and outputting a response voltage, a response current and a direct current through an AS pin to the EIS data detection module of the detection chip T1, amplifying the response current through the first amplifier MUX and the second amplifier HSTIA, and turning on and turning off the second amplifier; the first selector MUX_1 and the second selector MUX_2 are used for closing the second amplifier HSTIA and opening the third amplifier PGA, and voltage amplification processing is carried out on the response voltage to obtain an amplified response voltage; sequentially inputting the amplified response current and response voltage into a first filter AAF, a first analog-to-digital converter ADC_1, a second filter BPF and a discrete Fourier transform DFT to sequentially perform anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transform to obtain a discrete value of the response current under each frequency and a discrete value of the response voltage under each frequency, and determining an impedance value corresponding to each frequency according to the discrete value of the response current and the discrete value of the response voltage, wherein the discrete value comprises frequency, amplitude and phase to be emphasized; and performing the operations on the response voltages and the response currents corresponding to the frequencies in the target scanning interval to obtain impedance values corresponding to the different frequencies in the target scanning interval, fitting the impedance values in the target scanning interval to obtain EIS data of the first lithium ion battery in the target scanning interval, storing the EIS data of the first lithium ion battery, updating a battery control signal, and switching to the next lithium ion battery to detect the EIS data so as to obtain the EIS data of each lithium ion battery in real time.
And when EIS data of the first lithium ion battery is detected, direct current voltage is input to a voltage and temperature detection module through a VC pin, comprehensive measurement is carried out through a temperature sensor and a temperature sensitive resistor TR to obtain a temperature signal, the temperature signal is connected to a second analog-to-digital converter ADC_2 through a third selector MUX_3 to carry out accurate measurement, the second analog-to-digital converter ADC_2 is a 14-bit analog-to-digital converter, and the direct current voltage and the temperature signal are accurately measured through the second analog-to-digital converter ADC_2 to obtain the battery voltage and the battery temperature.
Meanwhile, the working voltage PACK acts on the lithium ion battery module, the current detection module and the charge-discharge module, as shown in fig. 4, the current flowing through the second resistor in the current detection module is the working current flowing in the lithium ion battery, the working current is collected through SRN and SRP pins of the detection chip T1, the third analog-to-digital converter ADC_3 is a 16-bit analog-to-digital converter, and the working current is input into the third analog-to-digital converter ADC_3 for analog-to-digital conversion, so that the battery current is obtained; the working current is connected into the current protection unit, the current protection unit comprises overcurrent detection and short circuit detection, the working current and the preset abnormal current are detected through the circuit protection unit, a monitoring signal is obtained, the monitoring signal is input into the data processing module, and when the monitoring signal indicates that the current is abnormal, the data processing module regulates and controls the charging and discharging signals in the driving protection module according to the real-time monitoring signal, so that the battery pack is effectively managed.
The application provides a lithium ion battery detection chip and a detection device, wherein the detection chip comprises: carrying out frequency sweep processing in a target frequency sweep interval through an excitation signal generation module to obtain a current excitation signal corresponding to each frequency, wherein the current excitation signal is used for exciting a lithium ion battery to generate response voltage, response current and direct current, and amplifying, anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transformation are carried out on the response voltage and the response current of each frequency through an EIS data detection module to obtain a discrete value of the response current and a discrete value of the response voltage; and determining impedance values of corresponding frequencies, performing module conversion and temperature test on the direct current voltage through a detection and temperature measurement module according to EIS data determined by a plurality of impedance values of a target sweep frequency interval to obtain battery voltage and battery temperature, and performing analog-to-digital conversion on working current through a current detection and monitoring module to obtain battery current. The lithium ion battery detection signal and the detection device provided by the application realize the detection of the voltage, the EIS data, the current and the temperature of the lithium ion battery, and especially the detection of the EIS data of the lithium ion battery is accurate and efficient, and the electrochemical impedance spectrum is not required to be detected by an offline experiment or a complex instrument, so that the battery management system can detect the battery more intelligently and accurately; meanwhile, the architecture design of the detection device simplifies the external connection circuit of the battery, reduces the complexity of system design and deployment and reduces the production cost.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.
Claims (10)
1. A lithium ion battery detection chip, comprising:
the excitation signal generation module is used for carrying out frequency sweep processing in a target frequency sweep interval to obtain a current excitation signal corresponding to each frequency, wherein the current excitation signal is used for exciting the lithium ion battery so as to generate response voltage, response current and direct current voltage;
The input end of the EIS data detection module is connected with the response voltage and the response current, the impedance value corresponding to each frequency is obtained during frequency sweep, and EIS data is determined based on a plurality of impedance values of the target frequency sweep interval; the process of obtaining the impedance value corresponding to each frequency comprises the following steps: amplifying, anti-aliasing filtering, analog-to-digital conversion, band-pass filtering and discrete Fourier transformation are respectively carried out on the response voltage and the response current to obtain a discrete value of the response voltage and a discrete value of the response current, and an impedance value of a corresponding frequency is determined according to the discrete value of the response voltage and the discrete value of the response current;
the input end of the voltage and temperature detection module is connected with the direct-current voltage, analog-to-digital conversion is carried out on the direct-current voltage to obtain battery voltage, and temperature test is carried out according to the direct-current voltage to obtain battery temperature;
the input end of the current detection and monitoring module is connected with the working current of the lithium ion battery, the working current is subjected to analog-to-digital conversion to obtain battery current, and a monitoring signal is generated according to the working current and a preset abnormal current;
And the input end of the data processing module is connected with the EIS data, the battery voltage, the battery temperature and the monitoring signal, performs data storage on the EIS data, the battery voltage and the battery temperature, updates a battery control signal according to the EIS data so as to switch the lithium ion battery acted by the current excitation signal, and controls the charging and discharging of the lithium ion battery based on the monitoring signal.
2. The lithium ion battery detection chip of claim 1, wherein the excitation signal generation module comprises a waveform generator, a first digital-to-analog converter, a first amplifier and a buffer, wherein the waveform generator carries out sweep frequency processing in the target sweep frequency interval based on a driving signal to obtain a plurality of digital signals with different frequencies, the digital signals are input into the first digital-to-analog converter, the digital signals are subjected to digital-to-analog conversion through the first digital-to-analog converter to obtain analog signals, the analog signals are input into the first amplifier, the analog signals are amplified through the first amplifier to obtain amplified analog signals, the amplified analog signals are input into the buffer, the amplified analog signals are buffered through the buffer, and the current excitation signals with different frequencies are externally output.
3. The lithium ion battery detection chip of claim 1, wherein the EIS data detection module includes a signal amplification processing unit, a first filter, a first analog-to-digital converter, a second filter, and a discrete fourier transform, the input end of the signal amplification processing unit is connected to the response voltage and the response current, the response current is subjected to current amplification processing, and then the response voltage is subjected to voltage amplification processing to obtain amplified response voltage and response current at each frequency, the output end of the signal amplification processing unit is connected to the first filter, the output end of the first filter is connected to the input end of the first analog-to-digital converter, the output end of the first analog-to-digital converter is connected to the input end of the second filter, and the output end of the second filter is connected to the input end of the discrete fourier transform, and anti-aliasing filtering, analog-to-digital conversion, band-pass filtering, and discrete fourier transform are performed on the amplified response voltage and response current to obtain a discrete value of the response current and a discrete value of the response voltage.
4. The lithium ion battery detection chip according to claim 3, wherein the signal amplification processing unit comprises a first selector, a second amplifier and a third amplifier, wherein an input end of the first selector collects the response voltage and the response current at each frequency, the second amplifier is turned on and the third amplifier is turned off through the first selector and the second selector, and the response current is subjected to current amplification processing to obtain amplified response current at each frequency; the first selector and the second selector close the second amplifier and open the third amplifier, and voltage amplification processing is carried out on the response voltage to obtain amplified response voltage under each frequency; the first output end of the first selector is connected with the first input end of the second amplifier, the second input end of the second amplifier is connected with the reference voltage, the first output end of the first selector is also connected with the first input end of the third amplifier, the second output end of the first selector is connected with the second input end of the third amplifier, the output end of the second amplifier is connected with the second selector, and the output end of the third amplifier is connected with the second selector.
5. The lithium ion battery detection chip of claim 1, wherein the voltage and temperature detection module comprises a third selector, a second analog-to-digital converter and a temperature sensor, the direct current voltage is collected through the third selector, the output end of the temperature sensor is connected with the input end of the third selector, the temperature signal is obtained by detecting the temperature of the direct current voltage based on the temperature sensor, the output end of the third selector is connected with the input end of the second analog-to-digital converter, and the direct current voltage and the temperature signal are subjected to analog-to-digital conversion through the second analog-to-digital converter, so that the battery voltage and the battery temperature are obtained.
6. The lithium ion battery detection chip according to claim 1, wherein the current detection and monitoring module comprises a third analog-to-digital converter and a current protection unit, the input end of the third analog-to-digital converter is connected with the working current, the third analog-to-digital converter performs analog-to-digital conversion on the working current to obtain the battery current, the input end of the current protection unit is connected with the working current, and the working current and the preset abnormal current are detected through the current protection unit to obtain the monitoring signal.
7. A lithium ion battery detection device, comprising: the lithium ion battery detection chip, the amplification selection module, the lithium ion battery module, the current detection module according to any one of claims 1 to 6;
The amplifying and selecting module is connected with the current excitation signal and the battery control signal, and performs switching control on the lithium ion battery acted by the current excitation signal according to the battery control signal;
The lithium ion battery module is connected with the current excitation signal and generates the response voltage, the response current and the direct current voltage based on the current excitation signal;
the current detection module is connected with the lithium ion battery module and working voltage, and generates the working current based on the working voltage.
8. The lithium ion battery detection chip of claim 7, wherein the amplification selection module comprises a fourth amplifier and a fourth selector, the input end of the fourth amplifier is connected with the current excitation signal, the output end of the fourth amplifier is connected with the input end of the fourth selector, the control end of the fourth selector is connected with the battery control signal, and the fourth selector closes a switch of a corresponding branch of the lithium ion battery acted by the current excitation signal according to the battery control signal.
9. The lithium ion battery detection chip of claim 8, wherein the lithium ion battery module comprises N lithium ion batteries and 2n+1 capacitors, one end of each of the i lithium ion batteries is connected with the output end of the fourth selector, the anode of the first lithium ion battery is connected with the positive electrode of the working voltage, the anode of the i lithium ion battery is connected with the other end of each of the i lithium ion batteries, the anode of the i lithium ion battery is further connected with the voltage and temperature detection module, the anode of the i lithium ion battery is further connected with the EIS data detection module after being connected with the i+n capacitors in series, the cathode of the i lithium ion battery is further connected with the EIS data detection module after being connected with the i+n+1 capacitors, the cathode of the i lithium ion battery is further connected with the anode of the next lithium ion battery after being connected with the i+n capacitors, and the cathode of the N lithium ion battery is further connected with the positive integer of N being equal to or greater than or less than 1.
10. The lithium ion battery detection chip of claim 7, wherein the current detection module comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, and a third resistor, wherein one end of the first capacitor is connected with one end of the second capacitor, one end of the first capacitor is further connected with one end of the second resistor after being connected in series with the first resistor, one end of the second resistor is further grounded, the other end of the first capacitor is grounded, the other end of the second capacitor is connected with the ground after being connected with the third capacitor in series with the third resistor, the other end of the second capacitor is further connected with the other end of the second resistor after being connected with the third resistor in series with the other end of the second capacitor, and the working current flows through the second resistor.
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