CN109799392B - Method for testing alternating current internal resistance of lithium battery - Google Patents
Method for testing alternating current internal resistance of lithium battery Download PDFInfo
- Publication number
- CN109799392B CN109799392B CN201910141073.5A CN201910141073A CN109799392B CN 109799392 B CN109799392 B CN 109799392B CN 201910141073 A CN201910141073 A CN 201910141073A CN 109799392 B CN109799392 B CN 109799392B
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- sampling
- control circuit
- sinusoidal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention provides a lithium battery alternating current internal resistance testing method, which comprises the steps that a sinusoidal signal generating circuit generates a positive half-cycle sinusoidal voltage signal and inputs the signal into a signal conversion circuit; the signal conversion circuit converts the positive half-cycle sinusoidal voltage signal into sinusoidal current and inputs the sinusoidal current into the sampling channel switching circuit; the sampling channel switching circuit selects a channel through which the sine current flows, and respectively inputs the generated sine voltage signals into the phase comparison and measurement circuit and the DSP sampling and control circuit; the phase comparison and measurement circuit generates two paths of capture signals and inputs the two paths of capture signals into the DSP sampling and control circuit; the DSP sampling and control circuit samples the sinusoidal voltage signal, and captures and calculates the time difference of the high level of the two captured signals; and respectively calculating impedance and power factors by using the AD values and the time differences sampled by different channels, and calculating the alternating current internal resistance by using the impedance and the power factors. The method of the invention can improve the response speed, shorten the test time and reduce the production cost.
Description
Technical Field
The invention relates to the field of battery testing, in particular to a method for testing alternating current internal resistance of a lithium battery.
Background
The lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloy, lithium ion and lithium polymer) in an electrochemical system, and at present, the lithium battery is widely applied to electronic products. In order to ensure the quality of the lithium battery, the alternating current internal resistance of the lithium battery needs to be tested after the lithium battery is produced. The prior art is realized by the following steps when testing the alternating current internal resistance of the lithium battery:
step 1, firstly generating a sinusoidal signal with a positive half period of 2KHz through DA, and then converting the sinusoidal signal into a complete sinusoidal alternating signal with 1KHz through an overturning circuit; step 2, converting the generated sine alternating current signal into a sine alternating current signal with an effective value of a certain amplitude; step 3, the current signal has 2 paths: the path 1 flows through 1 standard resistor Ri in the circuit to generate a voltage signal S1; the path 2 flows through the device to be tested Xi to generate a voltage signal S2; step 4, the generated voltage signal passes through an amplifying circuit and then passes through an effective value conversion circuit to obtain a corresponding effective value of the voltage signal; step 5, firstly obtaining an effective value S1 of the voltage signal corresponding to the channel 1, and then obtaining an effective value S2 of the voltage signal corresponding to the channel 2; and 6, calculating and obtaining the internal resistance value of Xi according to the formula Xi (S2/S1) Ri. However, the existing testing method has the following defects:
1. an effective value calculation circuit is required to be designed to convert the effective value of the alternating current signal into a voltage value, so that the production cost of the test equipment is increased, the response speed is low, and the test time is increased;
2. during actual test, a larger impact signal can be generated, so that the test time is prolonged in the process of recovering the steady state, and circuit components can be damaged;
3. the output waveform is directly generated by the DSP, so that communication or other operations easily cause interference to the waveform.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for testing the alternating current internal resistance of the lithium battery, and the method can improve the response speed, shorten the testing time, simplify the circuit structure and reduce the production cost of testing equipment.
The invention is realized by the following steps: a lithium battery alternating current internal resistance test method is provided, which comprises a sine signal generating circuit, a signal conversion circuit, a sampling channel switching circuit, a phase comparison and measurement circuit and a DSP sampling and control circuit; the sinusoidal signal generating circuit is connected with the signal conversion circuit, the signal conversion circuit is connected with the sampling channel switching circuit, the sampling channel switching circuit is respectively connected with the phase comparison and measurement circuit and the DSP sampling and control circuit, and the phase comparison and measurement circuit is connected with the DSP sampling and control circuit;
the method comprises the following steps:
step S1, generating a positive half-cycle sinusoidal voltage signal by the sinusoidal signal generating circuit, and inputting the positive half-cycle sinusoidal voltage signal into the signal converting circuit;
step S2, the signal conversion circuit converts the sine voltage signal of the positive half period into sine current and inputs the sine current into the sampling channel switching circuit;
step S3, selecting a channel through which a sine current flows by the sampling channel switching circuit, and respectively inputting the generated sine voltage signals into the phase comparison and measurement circuit and the DSP sampling and control circuit;
step S4, two paths of capture signals are generated by the phase comparison and measurement circuit and are input into the DSP sampling and control circuit;
step S5, the DSP sampling and control circuit samples the input sine voltage signal and stores the sampled AD value; meanwhile, the DSP sampling and control circuit captures and calculates the time difference of high levels of two paths of captured signals;
and step S6, respectively calculating impedance and power factors by using the AD values sampled by different channels and the time difference, and calculating the alternating current internal resistance through the impedance and the power factors.
Further, in the step S1, the sinusoidal signal generating circuit generates the positive half-cycle sinusoidal voltage signal specifically as follows: the high-speed DAC chip of the sine signal generating circuit generates a positive half-cycle sine voltage signal with the amplitude of 1200mV and the frequency of 2 KHz.
Further, in the step S2, the signal conversion circuit converts the positive half-cycle sinusoidal voltage signal into a sinusoidal current specifically as follows: the signal conversion circuit overturns and converts the sinusoidal voltage signal of the positive half period into sinusoidal current with the amplitude of 20mA and the frequency of 1 KHz.
Furthermore, the sampling channel switching circuit comprises 2 channels, wherein one channel is an internal reference resistor, and the other channel is externally connected with a lithium battery to be tested;
the step S3 specifically includes: firstly, selecting a sinusoidal current to flow through an internal reference resistor through the sampling channel switching circuit, and generating a first sinusoidal voltage signal at two ends of the internal reference resistor; meanwhile, a first sinusoidal voltage signal is filtered to form a first differential signal, and the first differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit;
then, selecting a sinusoidal current to flow through an external lithium battery to be tested through the sampling channel switching circuit, and generating second sinusoidal voltage signals at two ends of the external lithium battery to be tested; meanwhile, a second sinusoidal voltage signal is filtered to form a second differential signal, and the second differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit.
Further, the step S4 is specifically:
when the phase comparison and measurement circuit receives a first differential signal, the phase comparison and measurement circuit generates a 1KHz pulse as a path of first capture signal to be input into the DSP sampling and control circuit, and simultaneously, a path of 1KHz turning signal in the signal conversion circuit is input into the DSP sampling and control circuit as another path of first capture signal;
when the phase comparison and measurement circuit receives a second differential signal, a 1KHz pulse is generated by the phase comparison and measurement circuit and is used as a path of second capture signal to be input into the DSP sampling and control circuit, and meanwhile, a path of 1KHz turning signal in the signal conversion circuit is used as another path of second capture signal to be input into the DSP sampling and control circuit.
Further, the step S5 is specifically:
when the sampling channel switching circuit selects the internal reference resistor, the DSP sampling and control circuit samples the input first differential signal at a sampling frequency of 500KHz and stores a first group of AD values to be sampled in a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a first time difference t1 of high levels of two first capture signals;
when the sampling channel switching circuit selects an external lithium battery to be tested, the DSP sampling and control circuit samples the input second differential signal at a set sampling frequency and stores a second group of sampled AD values into a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a second time difference t2 of high levels of the two second capture signals.
Further, the step S6 is specifically:
sequentially converting each point of the first group of AD values into a corresponding first voltage value, multiplying each first voltage value by a first time difference t1, and sequentially superposing the first voltage values together to obtain a first area value S1; converting each point of the second group of AD values into a corresponding second voltage value in sequence, multiplying each second voltage value by a second time difference t2 and superposing the second voltage values together in sequence to obtain a second area value S2;
calculating impedance Z as S2/S1 100 according to ohm' S law;
calculating the total time difference delta T between the two channels to be T2-T1, wherein the power factor is eta cos (2 pi delta T/T), and T is 1 mS;
the ac internal resistance R ═ Z ═ η ═ S2/S1 ═ 100 · cos (2 pi ×. Δ T/T) was calculated.
Further, the set sampling frequency is 500 KHz.
Further, the resistance value of the internal reference resistor is 100m Ω.
Further, the DSP sampling and control circuit adopts a DSP28377s chip.
The invention has the following advantages: 1. compared with the prior art that an effective value calculation circuit is used for converting an effective value of an alternating current signal into a voltage value, the alternating current signal is calculated by adopting the high-speed ADC on the chip, so that the circuit structure can be simplified, and the production cost of test equipment is reduced; the response speed can be improved, so that the test time is effectively shortened; 2. the external high-speed DAC chip replaces a DSP to directly generate an output waveform, which is beneficial to simplifying the algorithm of the DSP and avoiding the interference of communication or other operations on the waveform; 3. the problems that a larger impact signal is generated, the testing time is prolonged, and circuit components are damaged in the prior art can be effectively solved.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a hardware schematic block diagram of the present invention.
Fig. 2 is a schematic block diagram of a sinusoidal signal generating circuit of the present invention.
Fig. 3 is a schematic block diagram of a signal conversion circuit according to the present invention.
Fig. 4 is a schematic block diagram of a sampling channel switching circuit according to the present invention.
FIG. 5 is a schematic block diagram of a DSP sampling and control circuit according to the present invention.
Fig. 6 is an execution flow chart of the lithium battery alternating current internal resistance testing method of the present invention.
Detailed Description
Referring to fig. 1 to 6, the method of the present invention for testing the ac internal resistance of a lithium battery requires providing a sinusoidal signal generating circuit, a signal converting circuit, a sampling channel switching circuit, a phase comparing and measuring circuit, and a DSP sampling and controlling circuit; the sinusoidal signal generating circuit is connected with the signal conversion circuit, the signal conversion circuit is connected with the sampling channel switching circuit, the sampling channel switching circuit is respectively connected with the phase comparison and measurement circuit and the DSP sampling and control circuit, and the phase comparison and measurement circuit is connected with the DSP sampling and control circuit;
the method comprises the following steps:
step S1, generating a positive half-cycle sinusoidal voltage signal by the sinusoidal signal generating circuit, and inputting the positive half-cycle sinusoidal voltage signal into the signal converting circuit;
in step S1, the sinusoidal signal generating circuit generates the positive half-cycle sinusoidal voltage signal specifically as follows: the high-speed DAC chip of the sine signal generating circuit generates a positive half-cycle sine voltage signal with the amplitude of 1200mV and the frequency of 2 KHz. In specific implementation, please refer to fig. 2, wherein the sinusoidal signal generating circuit includes a high-speed DAC output circuit and a waveform amplifying circuit, and the high-speed DAC output circuit is connected to the waveform amplifying circuit, wherein the high-speed DAC output circuit is configured to generate and output a positive half-cycle sinusoidal voltage signal with an amplitude of 1200mV and a frequency of 2 KHz; the waveform amplifying circuit is used for amplifying the output positive half-cycle sinusoidal voltage signal.
Step S2, the signal conversion circuit converts the sine voltage signal of the positive half period into sine current and inputs the sine current into the sampling channel switching circuit;
in step S2, the signal conversion circuit converts the positive half-cycle sinusoidal voltage signal into a sinusoidal current, specifically: the signal conversion circuit overturns and converts the sinusoidal voltage signal of the positive half period into sinusoidal current with the amplitude of 20mA and the frequency of 1 KHz. In specific implementation, please refer to fig. 3, wherein the signal conversion circuit includes a waveform flipping circuit and a conversion circuit, the waveform flipping circuit is connected to the conversion circuit, the waveform flipping circuit is configured to flip the positive half-cycle sinusoidal voltage signal, and meanwhile, the flipping signal of the waveform flipping circuit is further configured to be input into the DSP sampling and control circuit as the first capture signal; the conversion circuit is used for converting the inverted positive half-cycle sinusoidal voltage signal into sinusoidal current with the amplitude of 20mA and the frequency of 1 KHz.
Step S3, selecting a channel through which a sine current flows by the sampling channel switching circuit, and respectively inputting the generated sine voltage signals into the phase comparison and measurement circuit and the DSP sampling and control circuit;
please refer to fig. 4, the sampling channel switching circuit includes 2 channels, one of which is an internal reference resistor, and the other is an external lithium battery to be tested, and in specific implementation, the switching of different channels can be realized through a relay; the sampling channel switching circuit also comprises a filter circuit, and the internal reference resistor and the external lithium battery to be tested are connected with the filter circuit; the internal reference resistor is a high-precision resistor, and the resistance value of the internal reference resistor is 100m omega; the filter circuit is used for filtering the sinusoidal signal.
The step S3 specifically includes: firstly, selecting a sinusoidal current to flow through an internal reference resistor through the sampling channel switching circuit, and generating a first sinusoidal voltage signal at two ends of the internal reference resistor; meanwhile, a first sinusoidal voltage signal is filtered to form a first differential signal, and the first differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit;
then, selecting a sinusoidal current to flow through an external lithium battery to be tested through the sampling channel switching circuit, and generating second sinusoidal voltage signals at two ends of the external lithium battery to be tested; meanwhile, a second sinusoidal voltage signal is filtered to form a second differential signal, and the second differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit.
And step S4, generating two paths of capture signals through the phase comparison and measurement circuit and inputting the two paths of capture signals into the DSP sampling and control circuit so as to calculate the time difference through the generated phase difference. The reason why the phase difference is generated is: because the external lithium battery to be tested has capacitive impedance, the voltage waveform at two ends of the external lithium battery and the current waveform flowing through the external lithium battery have phase difference.
The step S4 specifically includes:
when the phase comparison and measurement circuit receives a first differential signal, the phase comparison and measurement circuit generates a 1KHz pulse as a path of first capture signal to be input into the DSP sampling and control circuit, and simultaneously, a path of 1KHz turning signal in the signal conversion circuit is input into the DSP sampling and control circuit as another path of first capture signal;
when the phase comparison and measurement circuit receives a second differential signal, a 1KHz pulse is generated by the phase comparison and measurement circuit and is used as a path of second capture signal to be input into the DSP sampling and control circuit, and meanwhile, a path of 1KHz turning signal in the signal conversion circuit is used as another path of second capture signal to be input into the DSP sampling and control circuit.
Step S5, the DSP sampling and control circuit samples the input sine voltage signal and stores the sampled AD value; meanwhile, the DSP sampling and control circuit captures and calculates the time difference of high levels of two paths of captured signals;
the step S5 specifically includes:
when the sampling channel switching circuit selects the internal reference resistor, the DSP sampling and control circuit samples the input first differential signal at a sampling frequency of 500KHz and stores a first group of AD values to be sampled in a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a first time difference t1 of high levels of two first capture signals; taking the inverted signal inside the signal conversion circuit as a time starting point, and taking the first differential signal received by the phase comparison and measurement circuit as a time end point, so as to calculate a first time difference t 1;
when the sampling channel switching circuit selects an external lithium battery to be tested, the DSP sampling and control circuit samples the input second differential signal at a set sampling frequency and stores a second group of sampled AD values into a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a second time difference t2 of high levels of two second capture signals; namely, the first time difference t2 is calculated by using the inverted signal inside the signal conversion circuit as a time starting point and the second differential signal received by the phase comparison and measurement circuit as a time ending point. Wherein, the set sampling frequency is 500KHz, that is, 500 points are sampled in each period.
In specific implementation, the DSP sampling and control circuit adopts a DSP28377s chip. Please refer to fig. 5, wherein the DSP sampling and control circuit includes a sampling signal input circuit, a DSP control circuit, a pulse signal input circuit, and a flip signal input circuit; the sampling signal input circuit, the pulse signal input circuit and the turning signal input circuit are all connected with the DSP control circuit, wherein the sampling signal input circuit is used for sampling a first differential signal or a second differential signal and inputting the first differential signal or the second differential signal to the DSP control circuit; the pulse signal input circuit is used for inputting the 1KHz pulse signal generated by the phase comparison and measurement circuit to the DSP control circuit; the turnover signal input circuit is used for inputting the turnover signal in the signal conversion circuit to the DSP control circuit; the DSP control circuit is used for realizing the calculation of time difference, impedance and the like.
And step S6, respectively calculating impedance and power factors by using the AD values sampled by different channels and the time difference, and calculating the alternating current internal resistance through the impedance and the power factors.
The step S6 specifically includes:
sequentially converting each point of the first group of AD values into a corresponding first voltage value, multiplying each first voltage value by a first time difference t1, and sequentially superposing the first voltage values together to obtain a first area value S1; converting each point of the second group of AD values into a corresponding second voltage value in sequence, multiplying each second voltage value by a second time difference t2 and superposing the second voltage values together in sequence to obtain a second area value S2;
calculating impedance Z as S2/S1 100 according to ohm' S law;
calculating the total time difference delta T between the two channels to be T2-T1, wherein the power factor is eta cos (2 pi delta T/T), and T is 1 mS;
the ac internal resistance R ═ Z ═ η ═ S2/S1 ═ 100 · cos (2 pi ×. Δ T/T) was calculated.
In summary, the invention has the following advantages: 1. compared with the prior art that an effective value calculation circuit is used for converting an effective value of an alternating current signal into a voltage value, the alternating current signal is calculated by adopting the high-speed ADC on the chip, so that the circuit structure can be simplified, and the production cost of test equipment is reduced; the response speed can be improved, so that the test time is effectively shortened; 2. the external high-speed DAC chip replaces a DSP to directly generate an output waveform, which is beneficial to simplifying the algorithm of the DSP and avoiding the interference of communication or other operations on the waveform; 3. the problems that a larger impact signal is generated, the testing time is prolonged, and circuit components are damaged in the prior art can be effectively solved.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. A lithium battery alternating current internal resistance test method is characterized by comprising the following steps: the method comprises providing a sinusoidal signal generating circuit, a signal converting circuit, a sampling channel switching circuit, a phase comparing and measuring circuit, and a DSP sampling and controlling circuit; the sinusoidal signal generating circuit is connected with the signal conversion circuit, the signal conversion circuit is connected with the sampling channel switching circuit, the sampling channel switching circuit is respectively connected with the phase comparison and measurement circuit and the DSP sampling and control circuit, and the phase comparison and measurement circuit is connected with the DSP sampling and control circuit;
the method comprises the following steps:
step S1, generating a positive half-cycle sinusoidal voltage signal by the sinusoidal signal generating circuit, and inputting the positive half-cycle sinusoidal voltage signal into the signal converting circuit;
step S2, the signal conversion circuit converts the sine voltage signal of the positive half period into sine current and inputs the sine current into the sampling channel switching circuit;
step S3, selecting a channel through which a sine current flows by the sampling channel switching circuit, and respectively inputting the generated sine voltage signals into the phase comparison and measurement circuit and the DSP sampling and control circuit;
step S4, two paths of capture signals are generated by the phase comparison and measurement circuit and are input into the DSP sampling and control circuit;
step S5, the DSP sampling and control circuit samples the input sine voltage signal and stores the sampled AD value; meanwhile, the DSP sampling and control circuit captures and calculates the time difference of high levels of two paths of captured signals;
and step S6, respectively calculating impedance and power factors by using the AD values sampled by different channels and the time difference, and calculating the alternating current internal resistance through the impedance and the power factors.
2. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: in step S1, the sinusoidal signal generating circuit generates the positive half-cycle sinusoidal voltage signal specifically as follows: the high-speed DAC chip of the sine signal generating circuit generates a positive half-cycle sine voltage signal with the amplitude of 1200mV and the frequency of 2 KHz.
3. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: in step S2, the signal conversion circuit converts the positive half-cycle sinusoidal voltage signal into a sinusoidal current, specifically: the signal conversion circuit overturns and converts the sinusoidal voltage signal of the positive half period into sinusoidal current with the amplitude of 20mA and the frequency of 1 KHz.
4. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the sampling channel switching circuit comprises 2 channels, wherein one channel is an internal reference resistor, and the other channel is externally connected with a lithium battery to be tested;
the step S3 specifically includes: firstly, selecting a sinusoidal current to flow through an internal reference resistor through the sampling channel switching circuit, and generating a first sinusoidal voltage signal at two ends of the internal reference resistor; meanwhile, a first sinusoidal voltage signal is filtered to form a first differential signal, and the first differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit;
then, selecting a sinusoidal current to flow through an external lithium battery to be tested through the sampling channel switching circuit, and generating second sinusoidal voltage signals at two ends of the external lithium battery to be tested; meanwhile, a second sinusoidal voltage signal is filtered to form a second differential signal, and the second differential signal is respectively input into the phase comparison and measurement circuit and the DSP sampling and control circuit.
5. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 4, wherein the method comprises the following steps: the step S4 specifically includes:
when the phase comparison and measurement circuit receives a first differential signal, the phase comparison and measurement circuit generates a 1KHz pulse as a path of first capture signal to be input into the DSP sampling and control circuit, and simultaneously, a path of 1KHz turning signal in the signal conversion circuit is input into the DSP sampling and control circuit as another path of first capture signal;
when the phase comparison and measurement circuit receives a second differential signal, a 1KHz pulse is generated by the phase comparison and measurement circuit and is used as a path of second capture signal to be input into the DSP sampling and control circuit, and meanwhile, a path of 1KHz turning signal in the signal conversion circuit is used as another path of second capture signal to be input into the DSP sampling and control circuit.
6. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 5, wherein the method comprises the following steps: the step S5 specifically includes:
when the sampling channel switching circuit selects the internal reference resistor, the DSP sampling and control circuit samples the input first differential signal at a sampling frequency of 500KHz and stores a first group of AD values to be sampled in a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a first time difference t1 of high levels of two first capture signals;
when the sampling channel switching circuit selects an external lithium battery to be tested, the DSP sampling and control circuit samples the input second differential signal at a set sampling frequency and stores a second group of sampled AD values into a buffer area; meanwhile, the DSP sampling and control circuit captures and calculates a second time difference t2 of high levels of the two second capture signals.
7. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 6, wherein the method comprises the following steps: the step S6 specifically includes:
sequentially converting each point of the first group of AD values into a corresponding first voltage value, multiplying each first voltage value by a first time difference t1, and sequentially superposing the first voltage values together to obtain a first area value S1; converting each point of the second group of AD values into a corresponding second voltage value in sequence, multiplying each second voltage value by a second time difference t2 and superposing the second voltage values together in sequence to obtain a second area value S2;
calculating impedance Z as S2/S1 100 according to ohm' S law;
calculating the total time difference delta T between the two channels to be T2-T1, wherein the power factor is eta cos (2 pi delta T/T), and T is 1 mS;
the ac internal resistance R ═ Z ═ η ═ S2/S1 ═ 100 · cos (2 pi ×. Δ T/T) was calculated.
8. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 6, wherein the method comprises the following steps: the sampling frequency is set to be 500 KHz.
9. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 4, wherein the method comprises the following steps: the resistance value of the internal reference resistor is 100m omega.
10. The method for testing the alternating current internal resistance of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the DSP sampling and control circuit adopts a DSP28377s chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910141073.5A CN109799392B (en) | 2019-02-26 | 2019-02-26 | Method for testing alternating current internal resistance of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910141073.5A CN109799392B (en) | 2019-02-26 | 2019-02-26 | Method for testing alternating current internal resistance of lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109799392A CN109799392A (en) | 2019-05-24 |
| CN109799392B true CN109799392B (en) | 2021-01-05 |
Family
ID=66562236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910141073.5A Active CN109799392B (en) | 2019-02-26 | 2019-02-26 | Method for testing alternating current internal resistance of lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109799392B (en) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477179A (en) * | 2009-01-15 | 2009-07-08 | 艾默生网络能源有限公司 | On-line AC detection method and system for internal resistance of accumulator |
| CN102053226B (en) * | 2009-10-29 | 2013-04-10 | 比亚迪股份有限公司 | Device and method for testing internal resistance of battery |
| CN102508035B (en) * | 2011-11-01 | 2014-11-12 | 武汉理工大学 | Fuel cell AC impedance on-line testing system and measuring and controlling method |
| CN202305673U (en) * | 2011-11-01 | 2012-07-04 | 武汉理工大学 | Alternating current (AC) impedance testing device suitable for fuel cells |
| CN103969596B (en) * | 2014-05-30 | 2016-08-10 | 上海海事大学 | The calculating of lithium-ion-power cell state-of-charge peculiar to vessel and correcting unit and method |
| CN106019160B (en) * | 2016-05-13 | 2019-04-23 | 福建省汽车工业集团云度新能源汽车股份有限公司 | A kind of battery management system and detection method of the electric car with AC internal Resistance inspection |
| CN107543967A (en) * | 2016-06-23 | 2018-01-05 | 江苏嘉钰新能源技术有限公司 | A kind of high tension battery alternating current internal resistance tester |
| CN106093799A (en) * | 2016-08-24 | 2016-11-09 | 上海金智晟东电力科技有限公司 | The accurate measuring systems of a kind of distribution terminal battery performance and method |
| JP2018055957A (en) * | 2016-09-29 | 2018-04-05 | 清水建設株式会社 | Power management device, power management method, and program |
| CN107192952B (en) * | 2017-03-31 | 2021-11-19 | 中国电力科学研究院 | Method and device for detecting internal temperature of battery |
| CN108896917A (en) * | 2018-06-18 | 2018-11-27 | 广州邦禾检测技术有限公司 | A kind of internal cell resistance detection system and method based on the weighted compensation degree factor |
| CN109270472B (en) * | 2018-12-06 | 2020-10-09 | 北京普莱德新能源电池科技有限公司 | Lithium battery online monitoring method and device |
-
2019
- 2019-02-26 CN CN201910141073.5A patent/CN109799392B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109799392A (en) | 2019-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2013205082A (en) | Insulation state detector | |
| CN108872882B (en) | Fault diagnosis device and method for three-level cascading inverter | |
| CN109459618B (en) | Quasi-online capacitance value detection method for direct-current bus capacitor of electric automobile electric drive system | |
| CN101533047B (en) | AC milliohm meter based on complex programmable logic device, and measurement method therefor | |
| US6820017B1 (en) | Method for determining the amplitude and phase angle of a measuring signal corresponding to a current or voltage of an electrical power supply network | |
| CN103091561B (en) | Device obtaining direct current signals from alternative current and direct current superposition signals and method thereof | |
| CN109799392B (en) | Method for testing alternating current internal resistance of lithium battery | |
| JP2014006144A (en) | Ac resistance measuring device and ac resistance measuring method | |
| CN107024632B (en) | Synchronization device and synchronization method for multi-measuring-point different wave recording equipment | |
| CN116930797A (en) | Detection circuit of internal resistance of battery | |
| CN104461093A (en) | Control system and touch device with same | |
| CN113376441B (en) | System and method for measuring parasitic inductance parameters of thin film capacitor | |
| CN105958510B (en) | SOC chip for power grid monitoring and control equipment | |
| CN108362940A (en) | A kind of dynamic harmonic frequency extraction method of half cycles distorted signal | |
| CN104330742A (en) | Method and device for suppressing series mode interference | |
| CN110138083B (en) | Measurement and control circuit of power distribution unit and calibration method thereof | |
| CN109782057B (en) | Circuit and method for measuring input active power of single-phase power supply of variable-frequency household appliance | |
| CN114062764A (en) | Direct current small current measuring system and method based on standard current | |
| CN209979811U (en) | Comprehensive detection device for driving motor of hybrid power generator | |
| CN105717393A (en) | Parameter test system and test method for electronic components | |
| CN207937587U (en) | A kind of detection device and detecting system of electric mutual inductor | |
| CN106452610A (en) | CVSD (Continuously Variable Slope Delta Modulation) digital pressure amplification modulation principle analysis experiment method and system | |
| CN205427072U (en) | LCR testing arrangement | |
| CN106597067B (en) | The voltage or current measuring device and method of a kind of random waveform arbitrary point | |
| CN204177846U (en) | A kind of optical fiber control circuit based on simple and easy amplifilter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |