CN109799392A - A kind of lithium battery AC internal Resistance test method - Google Patents
A kind of lithium battery AC internal Resistance test method Download PDFInfo
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- CN109799392A CN109799392A CN201910141073.5A CN201910141073A CN109799392A CN 109799392 A CN109799392 A CN 109799392A CN 201910141073 A CN201910141073 A CN 201910141073A CN 109799392 A CN109799392 A CN 109799392A
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Abstract
The present invention provides a kind of lithium battery AC internal Resistance test method, including sinusoidal signal generation circuit generates positive half period sine voltage signal and input signal conversion circuit；Positive half period sine voltage signal is converted sinusoidal current and input sample channel switching circuit by signal conversion circuit；The channel that sampling channel switching circuit selection sinusoidal current flows through, by the sine voltage signal of generation, input phase compares and measuring circuit and DSP sampling and control circuit respectively；Phase bit comparison and measuring circuit generate two-way capture signal and input DSP sampling and control circuit；DSP sampling and control circuit sample sine voltage signal, and DSP sampling captures with control circuit and calculates the time difference of two-way capture signal high level；Impedance and power factor (PF) are not calculated using the AD value and time difference of different channel samples, and AC internal Resistance is calculated by impedance and power factor (PF).Response speed can be improved in the method for the present invention, shortens the testing time, and can reduce production cost.
Description
Technical field
The present invention relates to battery testing fields, and spy is than being related to a kind of lithium battery AC internal Resistance test method.
Background technique
Lithium battery refers to the electricity for containing lithium (including lithium metal, lithium alloy and lithium ion, lighium polymer) in electrochemical system
Pond, currently, lithium battery has been widely used in electronic product.In order to ensure the quality of lithium battery, lithium is being produced
After battery, the AC internal Resistance of test lithium battery is required.The prior art is by walking as follows when testing lithium battery AC internal Resistance
Suddenly it realizes:
Step 1, the sinusoidal signal for first passing through DA generation 2KHz positive half period, then 1KHz is converted by reverse circuit
Complete sinusoidal ac signal；The sinusoidal ac signal of generation is converted to the sinusoidal friendship that virtual value is certain amplitude by step 2
Flow current signal；Step 3, current signal have 2 accesses: access 1 flows through 1 measuring resistance Ri inside circuit, generates voltage
Signal S1；Access 2 flows through Devices to test Xi, generates voltage signal S2；The voltage signal of generation is first passed through amplification electricity by step 4
Road obtains corresponding voltage signal virtual value using RMS-DC converter circuit；Step 5 first finds out the corresponding voltage of access 1
The virtual value S1 of signal, then find out the virtual value S2 of the corresponding voltage signal of access 2；Step 6 passes through formula Xi=(S2/S1) *
Ri calculates the internal resistance value for finding out Xi.But there are following defects for existing test method:
1, it needs to design virtual value counting circuit and converts voltage value for AC signal virtual value, this not only adds surveys
The production cost of equipment is tried, and response speed is slower, will increase the testing time；
2, in actual test, biggish impact signal can be generated, this not only to extend during restoring stable state
Testing time, but also may be damaged circuit components；
3, output waveform is directly generated by DSP, communication or other operations is caused to be easy to interfere waveform.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of lithium battery AC internal Resistance test method, passes through the test
Response speed not only can be improved in method, shortens the testing time, and can simplify circuit structure, reduces the production of test equipment
Cost.
The present invention is implemented as follows: a kind of lithium battery AC internal Resistance test method, the method need to provide a sinusoidal letter
Number circuit, a signal conversion circuit, a sampling channel switching circuit, a phase bit comparison and measuring circuit and a DSP occurs adopts
Sample and control circuit；The sinusoidal signal generation circuit is connected with the signal conversion circuit, the signal conversion circuit with
The sampling channel switching circuit is connected, the sampling channel switching circuit respectively with the phase bit comparison and measuring circuit and
The DSP sampling is connected with control circuit, and the phase bit comparison is sampled with measuring circuit with the DSP to be connected with control circuit
It connects；
Described method includes following steps:
Step S1, positive half period sine voltage signal is generated by the sinusoidal signal generation circuit, and by positive half period
Sine voltage signal is input in the signal conversion circuit；
Step S2, positive half period sine voltage signal is converted sinusoidal current by the described signal conversion circuit, and will be sinusoidal
Electric current is input in the sampling channel switching circuit；
Step S3, the channel that flows through of sinusoidal current is selected by the sampling channel switching circuit, and by the sine of generation
Voltage signal is separately input in the phase bit comparison and measuring circuit and DSP sampling and control circuit；
Step S4, two-way capture signal is generated by the phase bit comparison and measuring circuit and is input to the DSP and sampled
In control circuit；
Step S5, the described DSP sampling and control circuit sample the sine voltage signal of input, save the AD of sampling
Value；Meanwhile the DSP sampling captures with control circuit and calculates the time difference of two-way capture signal high level；
Step S6, impedance and power factor (PF) are calculated respectively using the AD value of different channel samples and time difference, and lead to
It crosses impedance and power factor (PF) calculates AC internal Resistance.
Further, in the step S1, the sinusoidal signal generation circuit generates positive half period sine voltage signal
Specifically: it is 1200mV that the high-speed DAC chip of the sinusoidal signal generation circuit, which generates amplitude, and frequency is the positive half period of 2KHz
Sine voltage signal.
Further, in the step S2, the signal conversion circuit converts positive half period sine voltage signal to
Sinusoidal current specifically: the signal conversion circuit carries out overturning to positive half period sine voltage signal and conversion forms amplitude and is
20mA, frequency are the sinusoidal current of 1KHz.
Further, the sampling channel switching circuit includes 2 channels, and one of channel is internal reference electricity
Resistance, another channel are external lithium battery to be measured；
The step S3 specifically: firstly, selecting sinusoidal current to flow through internal ginseng by the sampling channel switching circuit
Resistance is examined, and generates the first sine voltage signal at the both ends of internal reference resistor；Meanwhile the first sine voltage signal being passed through
It forms the first differential signal after filtering, and the first differential signal is separately input to the phase bit comparison and measuring circuit and described
In DSP sampling and control circuit；
Then, sinusoidal current is selected to flow through external lithium battery to be measured by the sampling channel switching circuit, and external
The both ends of lithium battery to be measured generate the second sine voltage signal；Meanwhile the second sine voltage signal is formed the after filtering
Two differential signals, and the second differential signal is separately input to the phase bit comparison and measuring circuit and DSP sampling and control
In circuit processed.
Further, the step S4 specifically:
When the phase bit comparison and measuring circuit receive the first differential signal, the phase bit comparison and measuring circuit are produced
The pulse of a raw 1KHz is input in the DSP sampling and control circuit as all the way first capture signal, meanwhile, it will be described
The energizing signal of 1KHz all the way inside signal conversion circuit as another way first capture signal be input to DSP sampling with
In control circuit；
When the phase bit comparison and measuring circuit receive the second differential signal, pass through the phase bit comparison and measurement electricity
The pulse that road generates a 1KHz is input in the DSP sampling and control circuit as all the way second capture signal, meanwhile, it will
The energizing signal of 1KHz all the way inside the signal conversion circuit is input to the DSP as the capture signal of another way second and adopts
In sample and control circuit.
Further, the step S5 specifically:
When the sampling channel switching circuit selects internal reference resistor, DSP sampling and control circuit with
The sample frequency of 500KHz samples the first differential signal of input, and first group of AD value of sampling is stored in buffering
Qu Zhong；Meanwhile DSP sampling captured with control circuit and calculate the capture signal high level of two-way first first time it is poor
t1；
When the sampling channel switching circuit selects external lithium battery to be measured, the DSP sampling and control circuit are to set
Fixed sample frequency samples the second differential signal of input, and second group of AD value of sampling is stored in buffer area；
Meanwhile the DSP sampling captures with control circuit and calculates the second time difference t2 that two-way second captures signal high level.
Further, the step S6 specifically:
Each point of first group of AD value is successively converted into corresponding the first voltage value, each the first voltage value is multiplied
It with poor t1 at the first time and is sequentially overlapped together, to obtain the first area value S1；By each point of second group of AD value according to
It is secondary to be converted into corresponding second voltage value, each second voltage value multiplied by the second time difference t2 and is sequentially overlapped together,
To obtain second area value S2；
Impedance Z=S2/S1*100 is calculated according to Ohm's law；
The total time difference Δ T=t2-t1 in two channels is calculated, power factor is η=cos (2 π * Δ T/T), wherein T
For 1mS；
Calculate AC internal Resistance R=Z* η=S2/S1*100*cos (2 π * Δ T/T).
Further, the sample frequency set is 500KHz.
Further, the resistance value of the internal reference resistor is 100m Ω.
Further, the DSP sampling uses DSP28377s chip with control circuit.
The present invention has the advantage that 1, use by the high-speed ADC of on piece AC signal and carry out operation, and it is existing
It needs to compare using virtual value counting circuit to convert voltage value for AC signal virtual value, not only can simplify circuit knot
Structure reduces the production cost of test equipment；And response speed can be improved, to effectively shorten the testing time；2, by outer
The high-speed DAC chip set replaces DSP directly to generate output waveform, this facilitates the algorithm for simplifying DSP, and avoid communication or
Other operations interfere waveform；3, can effectively evade it is existing in the prior art can generate biggish impact signal, and
The problem of leading to extended testing system time and damage circuit components.
Detailed description of the invention
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is hardware block diagram of the invention.
Fig. 2 is the functional block diagram of sinusoidal signal generation circuit in the present invention.
Fig. 3 is the functional block diagram of signal conversion circuit in the present invention.
Fig. 4 is the functional block diagram of sampling channel switching circuit in the present invention.
Fig. 5 is the functional block diagram of DSP sampling and control circuit in the present invention.
Fig. 6 is a kind of execution flow chart of lithium battery AC internal Resistance test method of the present invention.
Specific embodiment
Please emphasis referring to figs. 1 to shown in Fig. 6, a kind of preferred embodiment of lithium battery AC internal Resistance test method of the present invention,
The method need to provide a sinusoidal signal generation circuit, a signal conversion circuit, a sampling channel switching circuit, a phase bit comparison
With measuring circuit and DSP sampling and control circuit；The sinusoidal signal generation circuit is connected with the signal conversion circuit
Connect, the signal conversion circuit is connected with the sampling channel switching circuit, the sampling channel switching circuit respectively with institute
It states phase bit comparison to be connected with measuring circuit and DSP sampling with control circuit, the phase bit comparison and measuring circuit and institute
DSP sampling is stated to be connected with control circuit；
Described method includes following steps:
Step S1, positive half period sine voltage signal is generated by the sinusoidal signal generation circuit, and by positive half period
Sine voltage signal is input in the signal conversion circuit；
In the step S1, the sinusoidal signal generation circuit generates positive half period sine voltage signal specifically: institute
It is 1200mV that the high-speed DAC chip for stating sinusoidal signal generation circuit, which generates amplitude, and frequency is the positive half period sinusoidal voltage of 2KHz
Signal.In the specific implementation, ask emphasis referring to shown in Fig. 2, the sinusoidal signal generation circuit includes a high-speed DAC output circuit
And a waveform amplifying circuit, the high-speed DAC output circuit are connected with the waveform amplifying circuit, wherein the high speed
DAC output circuit is 1200mV for generating amplitude, and frequency is the positive half period sine voltage signal of 2KHz and exports；The wave
Shape amplifying circuit is for amplifying processing to the positive half period sine voltage signal of output.
Step S2, positive half period sine voltage signal is converted sinusoidal current by the described signal conversion circuit, and will be sinusoidal
Electric current is input in the sampling channel switching circuit；
In the step S2, positive half period sine voltage signal is converted sinusoidal current by the signal conversion circuit to be had
Body are as follows: the signal conversion circuit to positive half period sine voltage signal carry out overturning and conversion formed amplitude be 20mA, frequency
For the sinusoidal current of 1KHz.In the specific implementation, ask emphasis referring to shown in Fig. 3, the signal conversion circuit includes that a waveform turns over
Shifting circuit and a conversion circuit, the waveform reverse circuit are connected with the conversion circuit, and the waveform reverse circuit is used
It is overturn in positive half period sine voltage signal, meanwhile, the energizing signal of the waveform reverse circuit is also used to as
One capture signal is input in the DSP sampling and control circuit；The conversion circuit be used for will overturn after positive half period just
It is 20mA that string voltage signal, which is converted into amplitude, and frequency is the sinusoidal current of 1KHz.
Step S3, the channel that flows through of sinusoidal current is selected by the sampling channel switching circuit, and by the sine of generation
Voltage signal is separately input in the phase bit comparison and measuring circuit and DSP sampling and control circuit；
Please emphasis referring to shown in Fig. 4, the sampling channel switching circuit includes 2 channels, and one of channel is
Internal reference resistor, another channel are that external lithium battery to be measured can realize difference by relay in the specific implementation
The switching in channel；The sampling channel switching circuit also includes a filter circuit, the internal reference resistor and external lithium to be measured
Battery is connected with the filter circuit；Wherein, the internal reference resistor is precision resister, the resistance of internal reference resistor
Value is 100m Ω；The filter circuit is for playing filter action to sinusoidal signal.
The step S3 specifically: firstly, selecting sinusoidal current to flow through internal ginseng by the sampling channel switching circuit
Resistance is examined, and generates the first sine voltage signal at the both ends of internal reference resistor；Meanwhile the first sine voltage signal being passed through
It forms the first differential signal after filtering, and the first differential signal is separately input to the phase bit comparison and measuring circuit and described
In DSP sampling and control circuit；
Then, sinusoidal current is selected to flow through external lithium battery to be measured by the sampling channel switching circuit, and external
The both ends of lithium battery to be measured generate the second sine voltage signal；Meanwhile the second sine voltage signal is formed the after filtering
Two differential signals, and the second differential signal is separately input to the phase bit comparison and measuring circuit and DSP sampling and control
In circuit processed.
Step S4, two-way capture signal is generated by the phase bit comparison and measuring circuit and is input to the DSP and sampled
In control circuit, the time difference is calculated with phase difference by generation.The reason of generating phase difference is: due to external to be measured
Lithium battery itself has capacitive reactances, and therefore, the voltage waveform at both ends and the current waveform flowed through can have phase difference.
The step S4 specifically:
When the phase bit comparison and measuring circuit receive the first differential signal, the phase bit comparison and measuring circuit are produced
The pulse of a raw 1KHz is input in the DSP sampling and control circuit as all the way first capture signal, meanwhile, it will be described
The energizing signal of 1KHz all the way inside signal conversion circuit as another way first capture signal be input to DSP sampling with
In control circuit；
When the phase bit comparison and measuring circuit receive the second differential signal, pass through the phase bit comparison and measurement electricity
The pulse that road generates a 1KHz is input in the DSP sampling and control circuit as all the way second capture signal, meanwhile, it will
The energizing signal of 1KHz all the way inside the signal conversion circuit is input to the DSP as the capture signal of another way second and adopts
In sample and control circuit.
Step S5, the described DSP sampling and control circuit sample the sine voltage signal of input, save the AD of sampling
Value；Meanwhile the DSP sampling captures with control circuit and calculates the time difference of two-way capture signal high level；
The step S5 specifically:
When the sampling channel switching circuit selects internal reference resistor, DSP sampling and control circuit with
The sample frequency of 500KHz samples the first differential signal of input, and first group of AD value of sampling is stored in buffering
Qu Zhong；Meanwhile DSP sampling captured with control circuit and calculate the capture signal high level of two-way first first time it is poor
t1；I.e. using the energizing signal inside the signal conversion circuit as start time, the phase bit comparison is connect with measuring circuit
The first differential signal is received as end time, poor t1 at the first time is calculated with this；
When the sampling channel switching circuit selects external lithium battery to be measured, the DSP sampling and control circuit are to set
Fixed sample frequency samples the second differential signal of input, and second group of AD value of sampling is stored in buffer area；
Meanwhile the DSP sampling captures with control circuit and calculates the second time difference t2 that two-way second captures signal high level；I.e.
Using the energizing signal inside the signal conversion circuit as start time, the phase bit comparison and measuring circuit are received the
Two differential signals calculate poor t2 at the first time as end time, with this.Wherein, the sample frequency set as 500KHz,
I.e. each period can sample 500 points.
In the specific implementation, the DSP sampling uses DSP28377s chip with control circuit.It please emphasis reference Fig. 5 institute
Show, the DSP sampling includes a sampled signal input circuit, a DSP control circuit, pulse signal input electricity with control circuit
Road and an energizing signal input circuit；The sampled signal input circuit, pulse signal input circuit and energizing signal are defeated
Enter circuit to be connected with the DSP control circuit, wherein the sampled signal input circuit be used for the first differential signal or
The second differential signal of person samples and inputs to the DSP control circuit；The pulse signal input circuit is used for will be described
The pulse signal for the 1KHz that phase bit comparison and measuring circuit generate inputs to the DSP control circuit；The energizing signal input
Circuit is used to the energizing signal inside the signal conversion circuit inputing to the DSP control circuit；The DSP control circuit
For realizing the calculating of time difference, impedance etc..
Step S6, impedance and power factor (PF) are calculated respectively using the AD value of different channel samples and time difference, and lead to
It crosses impedance and power factor (PF) calculates AC internal Resistance.
The step S6 specifically:
Each point of first group of AD value is successively converted into corresponding the first voltage value, each the first voltage value is multiplied
It with poor t1 at the first time and is sequentially overlapped together, to obtain the first area value S1；By each point of second group of AD value according to
It is secondary to be converted into corresponding second voltage value, each second voltage value multiplied by the second time difference t2 and is sequentially overlapped together,
To obtain second area value S2；
Impedance Z=S2/S1*100 is calculated according to Ohm's law；
The total time difference Δ T=t2-t1 in two channels is calculated, power factor is η=cos (2 π * Δ T/T), wherein T
For 1mS；
Calculate AC internal Resistance R=Z* η=S2/S1*100*cos (2 π * Δ T/T).
In conclusion the present invention has the advantage that 1, AC signal is used by the high-speed ADC of on piece and is transported
Calculate, with it is existing need to convert voltage value for AC signal virtual value using virtual value counting circuit compared with, not only can letter
Change circuit structure, reduces the production cost of test equipment；And response speed can be improved, to effectively shorten the testing time；
2, DSP is replaced directly to generate output waveform by external high-speed DAC chip, this facilitates the algorithm for simplifying DSP, and avoids
Communication or other operations interfere waveform；3, can effectively evade existing in the prior art can generate biggish impact
Signal, and cause the extended testing system time and damage circuit components the problem of.
Although specific embodiments of the present invention have been described above, those familiar with the art should be managed
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field should be covered of the invention according to modification and variation equivalent made by spirit of the invention
In scope of the claimed protection.
Claims (10)
1. a kind of lithium battery AC internal Resistance test method, it is characterised in that: the method need to provide a sinusoidal signal generation circuit,
One signal conversion circuit, a sampling channel switching circuit, a phase bit comparison and measuring circuit and DSP sampling and control electricity
Road；The sinusoidal signal generation circuit is connected with the signal conversion circuit, and the signal conversion circuit and the sampling are logical
Road switching circuit is connected, and the sampling channel switching circuit is adopted with the phase bit comparison with measuring circuit and the DSP respectively
Sample is connected with control circuit, and the phase bit comparison is sampled with measuring circuit with the DSP to be connected with control circuit；
Described method includes following steps:
Step S1, positive half period sine voltage signal is generated by the sinusoidal signal generation circuit, and positive half period is sinusoidal
Voltage signal is input in the signal conversion circuit；
Step S2, positive half period sine voltage signal is converted sinusoidal current by the described signal conversion circuit, and by sinusoidal current
It is input in the sampling channel switching circuit；
Step S3, the channel that flows through of sinusoidal current is selected by the sampling channel switching circuit, and by the sinusoidal voltage of generation
Signal is separately input in the phase bit comparison and measuring circuit and DSP sampling and control circuit；
Step S4, two-way capture signal is generated by the phase bit comparison and measuring circuit and is input to the DSP sampling and control
In circuit processed；
Step S5, the described DSP sampling and control circuit sample the sine voltage signal of input, save the AD value of sampling；
Meanwhile the DSP sampling captures with control circuit and calculates the time difference of two-way capture signal high level；
Step S6, impedance and power factor (PF) are calculated respectively using the AD value of different channel samples and time difference, and pass through resistance
Anti- and power factor (PF) calculates AC internal Resistance.
2. a kind of lithium battery AC internal Resistance test method according to claim 1, it is characterised in that: in the step S1
In, the sinusoidal signal generation circuit generates positive half period sine voltage signal specifically: the sinusoidal signal generation circuit
It is 1200mV that high-speed DAC chip, which generates amplitude, and frequency is the positive half period sine voltage signal of 2KHz.
3. a kind of lithium battery AC internal Resistance test method according to claim 1, it is characterised in that: in the step S2
In, positive half period sine voltage signal is converted sinusoidal current by the signal conversion circuit specifically: the signal conversion electricity
Road carries out overturning to positive half period sine voltage signal and conversion forms amplitude as 20mA, and frequency is the sinusoidal current of 1KHz.
4. a kind of lithium battery AC internal Resistance test method according to claim 1, it is characterised in that: the sampling channel is cut
Changing circuit includes 2 channels, and one of channel is internal reference resistor, another channel is external lithium battery to be measured；
The step S3 specifically: firstly, selecting sinusoidal current to flow through internal reference electricity by the sampling channel switching circuit
Resistance, and the first sine voltage signal is generated at the both ends of internal reference resistor；Meanwhile by the first sine voltage signal by filtering
After form the first differential signal, and the first differential signal is separately input to the phase bit comparison and measuring circuit and the DSP
In sampling and control circuit；
Then, sinusoidal current is selected to flow through external lithium battery to be measured by the sampling channel switching circuit, and reception is surveyed outside
The both ends of lithium battery generate the second sine voltage signal；Meanwhile it is poor that the second sine voltage signal is formed to second after filtering
Sub-signal, and the second differential signal is separately input to the phase bit comparison and measuring circuit and DSP sampling and control electricity
Lu Zhong.
5. a kind of lithium battery AC internal Resistance test method according to claim 4, it is characterised in that: the step S4 is specific
Are as follows:
When the phase bit comparison and measuring circuit receive the first differential signal, the phase bit comparison and measuring circuit generate one
The pulse of a 1KHz is input in the DSP sampling and control circuit as all the way first capture signal, meanwhile, by the signal
The energizing signal of 1KHz all the way inside conversion circuit captures signal as another way first and is input to the DSP sampling and control
In circuit；
When the phase bit comparison and measuring circuit receive the second differential signal, produced by the phase bit comparison and measuring circuit
The pulse of a raw 1KHz is input in the DSP sampling and control circuit as all the way second capture signal, meanwhile, it will be described
The energizing signal of 1KHz all the way inside signal conversion circuit as another way second capture signal be input to DSP sampling with
In control circuit.
6. a kind of lithium battery AC internal Resistance test method according to claim 5, it is characterised in that: the step S5 is specific
Are as follows:
When the sampling channel switching circuit selects internal reference resistor, the DSP sampling and control circuit are with 500KHz's
Sample frequency samples the first differential signal of input, and first group of AD value of sampling is stored in buffer area；Together
When, the DSP sampling captures with control circuit and calculates the first time poor t1 that two-way first captures signal high level；
When the sampling channel switching circuit selects external lithium battery to be measured, DSP sampling and control circuit are to set
Sample frequency samples the second differential signal of input, and second group of AD value of sampling is stored in buffer area；Together
When, the DSP sampling captures with control circuit and calculates the second time difference t2 that two-way second captures signal high level.
7. a kind of lithium battery AC internal Resistance test method according to claim 6, it is characterised in that: the step S6 is specific
Are as follows:
Each point of first group of AD value is successively converted into corresponding the first voltage value, by each the first voltage value multiplied by
One time difference t1 is simultaneously sequentially overlapped together, to obtain the first area value S1；Each point of second group of AD value is successively changed
It is counted as corresponding second voltage value, each second voltage value multiplied by the second time difference t2 and is sequentially overlapped together, thus
Obtain second area value S2；
Impedance Z=S2/S1*100 is calculated according to Ohm's law；
Calculate the total time difference Δ T=t2-t1 in two channels, power factor is η=cos (2 π * Δ T/T), wherein T is
1mS；
Calculate AC internal Resistance R=Z* η=S2/S1*100*cos (2 π * Δ T/T).
8. a kind of lithium battery AC internal Resistance test method according to claim 6, it is characterised in that: the sample frequency of setting
For 500KHz.
9. a kind of lithium battery AC internal Resistance test method according to claim 4, it is characterised in that: the internal reference electricity
The resistance value of resistance is 100m Ω.
10. a kind of lithium battery AC internal Resistance test method according to claim 1, it is characterised in that: DSP sampling with
Control circuit uses DSP28377s chip.
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