A lithium battery testing equipment automatic calibration review device and method

Abstract

The present invention provides a lithium battery detection equipment automatic calibration review device and method in the field of lithium battery detection technology, the device includes a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe, and a third probe; the main control board includes an MCU, a switching circuit, a signal source, a power supply circuit, a digital-to-analog conversion circuit, and an RS232 interface; the first copper bar is connected to the first probe, the discharge source, and the power supply circuit; the second copper bar is connected to the second probe and the signal source; one end of the third copper bar is connected to the third probe, and the other end is connected to the signal source; one end of the RS232 interface is connected to the MCU, and the other end is connected to the DC tester; one end of the power supply circuit is connected to the MCU, and the other end is connected to the first copper bar; the switching circuit is connected to the MCU, the signal source, and the discharge source respectively; the digital-to-analog conversion circuit is connected to the MCU. The advantage of the present invention is that the efficiency and reliability of the calibration review of the lithium battery detection equipment are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery detection, and in particular to an automatic calibration and verification device and method for lithium battery detection equipment. Background Art

[0002] With the further improvement of new energy vehicle manufacturing technology and the rapid development of emerging high-end lithium battery application fields such as robots, civil drones, and aerospace, the requirements for the refinement of indicators such as mileage estimation and safety are also increasing. The market has stricter quality requirements for lithium batteries such as consistency, capacity, life, and discharge efficiency, which also prompts the need to continuously improve the detection accuracy of lithium battery testing equipment and puts forward higher requirements for the stability of lithium battery testing equipment. Due to the discreteness of the working environment and each device as the working time increases, the signal accuracy and stability of the lithium battery testing equipment will deviate. Therefore, in order to ensure the high accuracy and stability of the lithium battery testing equipment, it is necessary to calibrate and review the lithium battery testing equipment regularly in its actual application.

[0003] The calibration and verification of lithium battery testing equipment is traditionally mainly done manually, that is, using a high-precision voltage and current meter to measure the accuracy check point, the measurement result is called the actual value, and then the actual value and the more accurate point are manually entered in the host computer, the factor is calculated through the calibration formula, and then the factor is written into the lithium battery testing equipment, and the verification point of the lithium battery testing equipment is manually loaded, and the actual value is measured and compared with the verification point to see if it meets the accuracy requirements, so as to calibrate and verify the lithium battery testing equipment. However, the traditional method is time-consuming, labor-intensive, inefficient, and manual operation is prone to the potential risk of operating errors.

[0004] Therefore, how to provide an automatic calibration and review device and method for lithium battery testing equipment to improve the efficiency and reliability of the calibration and review of lithium battery testing equipment has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a device and method for automatic calibration and review of lithium battery testing equipment, so as to improve the efficiency and reliability of the calibration and review of lithium battery testing equipment.

[0006] In a first aspect, the present invention provides an automatic calibration and verification device for lithium battery testing equipment, comprising a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe and a third probe;

[0007] The main control board includes an MCU, a switching circuit, a signal source, a power supply circuit, a digital-to-analog conversion circuit and an RS232 interface;

[0008] One end of the first copper bar is connected to the first probe, and the other end is connected to the discharge source and the power supply circuit; one end of the second copper bar is connected to the second probe, and the other end is connected to the signal source; one end of the third copper bar is connected to the third probe, and the other end is connected to the signal source; one end of the RS232 interface is connected to the MCU, and the other end is connected to the DC tester; one end of the power supply circuit is connected to the MCU, and the other end is connected to the first copper bar; the switching circuit is respectively connected to the MCU, the signal source and the discharge source; the digital-to-analog conversion circuit is connected to the MCU.

[0009] Furthermore, the model of the MCU is STM32F429.

[0010] Furthermore, the model of the DC tester is Hangzhi PI U600V.

[0011] Furthermore, the model of the discharge source is Mean Well RSP-1500-5.

[0012] In a second aspect, the present invention provides a method for automatic calibration and verification of a lithium battery testing device, comprising the following steps:

[0013] Step S1, the host computer is connected to the lithium battery detection device and the calibration verification device through the switch, the lithium battery detection device is connected to the calibration verification device through the second probe and the third probe, and the calibration verification device is connected to the mains through the first probe;

[0014] Step S2, the host computer controls the calibration and verification device to perform voltage calibration and verification on the lithium battery testing equipment;

[0015] Step S3, the host computer controls the calibration and verification device to perform calibration and verification on the charging current of the lithium battery testing equipment;

[0016] Step S4, the host computer controls the calibration and verification device to perform calibration and verification on the discharge current of the lithium battery testing equipment;

[0017] Step S5: The host computer controls the calibration verification device to verify the temperature acquisition accuracy of the lithium battery detection equipment;

[0018] Step S6: The upper computer controls the calibration and verification device to perform calibration and verification on the pressure signal accuracy of the lithium battery testing equipment;

[0019] The steps S2 to S6 are performed in no particular order.

[0020] Furthermore, the step S2 is specifically as follows:

[0021] The host computer controls the lithium battery detection device to output the set voltage value V11 and the set voltage value V12 to the calibration review device, and the MCU collects the actual voltage value V21 and the actual voltage value V22 through the DC tester and uploads them to the host computer. The host computer calculates the voltage calibration factor based on the set voltage value V11, the set voltage value V12, the actual voltage value V21 and the actual voltage value V22 and writes it into the lithium battery detection device for calibration;

[0022] The host computer controls the lithium battery detection equipment to output the set voltage value V31 to the calibration review device. The MCU collects the actual voltage value V41 through the DC tester and uploads it to the host computer. The host computer compares the set voltage value V31 and the actual voltage value V41 based on the preset voltage error accuracy for review.

[0023] Furthermore, the step S3 is specifically as follows:

[0024] The host computer controls the lithium battery detection device to output the set charging current value I11 and the set charging current value I12 to the calibration review device, and the MCU collects the actual charging current value I21 and the actual charging current value I22 through the DC tester and uploads them to the host computer. The host computer calculates the charging current calibration factor based on the set charging current value I11, the set charging current value I12, the actual charging current value I21 and the actual charging current value I22, and writes it into the lithium battery detection device for calibration;

[0025] The host computer controls the lithium battery detection equipment to output the set charging current value I31 to the calibration review device. The MCU collects the actual charging current value I41 through the DC tester and uploads it to the host computer. The host computer compares the set charging current value I31 and the charging current value I41 based on the preset charging current error accuracy for review.

[0026] Furthermore, the step S4 is specifically as follows:

[0027] The host computer controls the lithium battery detection device to output the set discharge current value I51 and the set discharge current value I52 to the calibration review device, and the MCU collects the actual discharge current value I61 and the actual discharge current value I62 through the DC tester and uploads them to the host computer. The host computer calculates the discharge current calibration factor based on the set discharge current value I51, the set discharge current value I52, the actual discharge current value I61 and the actual discharge current value I62, and writes it into the lithium battery detection device for calibration;

[0028] The host computer controls the lithium battery detection equipment to output the set discharge current value I71 to the calibration review device. The MCU collects the actual discharge current value I81 through the DC tester and uploads it to the host computer. The host computer compares the set discharge current value I71 and the actual discharge current value I81 based on the preset discharge current error accuracy for review.

[0029] Furthermore, the step S5 is specifically as follows:

[0030] The host computer sets the set temperature value that needs to be reviewed, and controls the calibration review device to output the analog voltage signal corresponding to the set temperature value to the lithium battery detection equipment through the digital-to-analog conversion circuit. The temperature detection module of the lithium battery detection equipment sends the collected temperature value to the host computer. The host computer compares the set temperature value and the temperature collection value based on the preset temperature error accuracy for review.

[0031] Furthermore, the step S6 is specifically as follows:

[0032] The host computer sets pressure calibration points V51 and V52, and the MCU outputs corresponding voltage signals to the lithium battery detection equipment through the digital-to-analog conversion circuit to simulate the potential difference generated when the pressure sensor is subjected to pressure; the MCU collects the actual value V61 and V62 of the pressure simulation signal through the DC tester, and the lithium battery detection equipment collects the pressure simulation signal acquisition value V71 and V72, and uploads the actual value V621, V62, V71 and V72 to the host computer; the host computer calculates the pressure calibration factor based on the actual value V61, V62, V71 and V72, and writes it into the lithium battery detection equipment for calibration.

[0033] The host computer sets the pressure calibration point V71 that needs to be reviewed, and the MCU outputs the corresponding voltage signal to the lithium battery detection equipment through the digital-to-analog conversion circuit. The lithium battery detection equipment collects the pressure analog signal acquisition value V81 and sends it to the host computer. The MCU collects the actual value V91 of the pressure analog signal through the DC tester and sends it to the host computer. The host computer compares the pressure analog signal acquisition value V81 and the actual value V91 of the pressure analog signal based on the preset pressure error accuracy for review.

[0034] The advantages of the present invention are:

[0035] The calibration review device includes a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe and a third probe. The main control board is connected to the first copper bar, the second copper bar, the third copper bar, the discharge source and the DC tester respectively. The second probe is connected to the second copper bar and the lithium battery detection device, the third probe is connected to the third copper bar and the lithium battery detection device, the first probe is connected to the first copper bar and the mains, and the discharge source is also connected to the first copper bar. When calibration review is required, the host computer is connected to the lithium battery detection device and the calibration review device through a switch, and the host computer controls the calibration review device to send a signal to the lithium battery detection device. The device outputs the corresponding set value, collects the corresponding actual value through the DC tester, obtains the collected value of the lithium battery testing device, and calculates the corresponding calibration factor based on the actual value and the collected value through a first-order function and writes it into the lithium battery testing device. Subsequently, the lithium battery testing device can output the calibrated collected value based on the calibration factor. After the calibration is completed, the corresponding points are set for review and verification, and finally the voltage, charging current, discharge current, temperature collection accuracy and pressure signal accuracy are automatically calibrated and reviewed. Compared with traditional manual operations, the efficiency and reliability of the calibration review of the lithium battery testing equipment are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0037] Figure 1 The invention discloses a circuit principle block diagram of an automatic calibration and verification device for lithium battery testing equipment.

[0038] Figure 2 The present invention is a flowchart of a method for automatic calibration and verification of lithium battery testing equipment. DETAILED DESCRIPTION

[0039] The technical solution in the embodiment of the present application has the following overall idea: the upper computer controls the calibration review device to output the corresponding setting value to the lithium battery detection equipment, collects the corresponding actual value through the DC tester, obtains the collected value of the lithium battery detection equipment, and automatically calculates the corresponding calibration factor based on the actual value and the collected value through a first-order function and writes it into the lithium battery detection equipment. After the calibration is completed, the corresponding points are set for review and verification, and finally the voltage, charging current, discharge current, temperature collection accuracy and pressure signal accuracy are automatically calibrated and reviewed, so as to improve the efficiency and reliability of the calibration review of the lithium battery detection equipment.

[0040] Please refer to Figure 1 to Figure 2As shown, a preferred embodiment of an automatic calibration and verification device for lithium battery testing equipment of the present invention comprises a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe and a third probe; the first copper bar, the second copper bar and the third copper bar are only used for passing voltage and current;

[0041] The main control board includes an MCU, a switching circuit, a signal source, a power supply circuit, a digital-to-analog conversion circuit and an RS232 interface;

[0042] One end of the first copper bar is connected to the first probe, and the other end is connected to the discharge source and the power supply circuit; one end of the second copper bar is connected to the second probe, and the other end is connected to the signal source; one end of the third copper bar is connected to the third probe, and the other end is connected to the signal source; one end of the RS232 interface is connected to the MCU, and the other end is connected to the DC tester; one end of the power supply circuit is connected to the MCU, and the other end is connected to the first copper bar; the switching circuit is respectively connected to the MCU, the signal source and the discharge source; the digital-to-analog conversion circuit is connected to the MCU.

[0043] The model of the MCU is STM32F429, which supports up to 128 expansion IO ports and supports Ethernet, 232 and 485 communications; the content controlled by the MCU includes: using a switching circuit to measure the signals that need to be calibrated by a DC test instrument in sequence; in different working modes of charging or discharging the lithium battery detection equipment, deciding whether to switch the discharge power source (discharging mode switching, charging mode not switching); controlling the digital-to-analog conversion circuit to output a corresponding analog voltage signal.

[0044] The model of the DC tester is Hangzhi PI U600V, the DC voltage measurement range is ±10V, the DC current test range is ±600A, the measurement accuracy is 0.01%, it is equipped with RS232 and RS485 communication interfaces, voltage and current multi-range switching, and can measure up to 110% of the limit.

[0045] The model of the discharge source is Mean Well RSP-1500-5, with an output voltage range of 4.5-5.5V, a rated current of 240A, an output efficiency of up to 91%, short circuit, overload, overvoltage, and over-temperature protection, and supports active parallel connection of 6000W (3+1), and an operating temperature of up to 70°C; in specific implementation, three discharge sources can be connected in parallel to increase the rated current.

[0046] A preferred embodiment of a method for automatic calibration and verification of a lithium battery testing device of the present invention comprises the following steps:

[0047] Step S1, the host computer is connected to the lithium battery detection device and the calibration verification device through the switch, the lithium battery detection device is connected to the calibration verification device through the second probe and the third probe, and the calibration verification device is connected to the mains through the first probe; the host computer communicates with the main control board through the UDP protocol;

[0048] Step S2, the host computer controls the calibration and verification device to perform voltage calibration and verification on the lithium battery testing equipment;

[0049] Step S3, the host computer controls the calibration and verification device to perform calibration and verification on the charging current of the lithium battery testing equipment;

[0050] Step S4, the host computer controls the calibration and verification device to perform calibration and verification on the discharge current of the lithium battery testing equipment;

[0051] Step S5: The host computer controls the calibration verification device to verify the temperature acquisition accuracy of the lithium battery detection equipment;

[0052] Step S6: The upper computer controls the calibration and verification device to perform calibration and verification on the pressure signal accuracy of the lithium battery testing equipment;

[0053] The steps S2 to S6 are performed in no particular order.

[0054] The calibration points of the present invention are all 20% and 80% of the measuring range; if the verified error is within the accuracy range (error accuracy), the verification is successful; if it is not within the accuracy range, recalibration is performed; if it is still not within the accuracy range after two calibrations, the calibration is determined to have failed and the calibration is terminated, and manual inspection of the lithium battery testing equipment is required to eliminate problems with the equipment hardware itself.

[0055] The step S2 is specifically as follows:

[0056] The host computer controls the lithium battery detection device to output the set voltage value V11 and the set voltage value V12 to the calibration review device, and the MCU collects the actual voltage value V21 and the actual voltage value V22 through the DC tester and uploads them to the host computer. The host computer calculates the voltage calibration factor based on the set voltage value V11, the set voltage value V12, the actual voltage value V21 and the actual voltage value V22 and writes it into the lithium battery detection device for calibration;

[0057] The host computer controls the lithium battery detection equipment to output the set voltage value V31 to the calibration review device. The MCU collects the actual voltage value V41 through the DC tester and uploads it to the host computer. The host computer compares the set voltage value V31 and the actual voltage value V41 based on the preset voltage error accuracy for review.

[0058] The voltage calibration factor calculation process is as follows:

[0059] V21=k*V11+b;

[0060] V22=k*V12+b;

[0061] Where k and b are voltage calibration factors, and the calculation methods of the remaining calibration factors are the same.

[0062] The step S3 is specifically as follows:

[0063] The host computer controls the lithium battery detection device to output the set charging current value I11 and the set charging current value I12 to the calibration review device, and the MCU collects the actual charging current value I21 and the actual charging current value I22 through the DC tester and uploads them to the host computer. The host computer calculates the charging current calibration factor based on the set charging current value I11, the set charging current value I12, the actual charging current value I21 and the actual charging current value I22, and writes it into the lithium battery detection device for calibration;

[0064] The host computer controls the lithium battery detection equipment to output the set charging current value I31 to the calibration review device. The MCU collects the actual charging current value I41 through the DC tester and uploads it to the host computer. The host computer compares the set charging current value I31 and the charging current value I41 based on the preset charging current error accuracy for review.

[0065] The step S4 is specifically as follows:

[0066] The host computer controls the lithium battery detection device to output the set discharge current value I51 and the set discharge current value I52 to the calibration review device, and the MCU collects the actual discharge current value I61 and the actual discharge current value I62 through the DC tester and uploads them to the host computer. The host computer calculates the discharge current calibration factor based on the set discharge current value I51, the set discharge current value I52, the actual discharge current value I61 and the actual discharge current value I62, and writes it into the lithium battery detection device for calibration;

[0067] The host computer controls the lithium battery detection equipment to output the set discharge current value I71 to the calibration review device. The MCU collects the actual discharge current value I81 through the DC tester and uploads it to the host computer. The host computer compares the set discharge current value I71 and the actual discharge current value I81 based on the preset discharge current error accuracy for review.

[0068] The step S5 is specifically as follows:

[0069] The host computer sets the set temperature value that needs to be reviewed, and controls the calibration review device to output the analog voltage signal corresponding to the set temperature value to the lithium battery detection equipment through the digital-to-analog conversion circuit. The temperature detection module of the lithium battery detection equipment sends the collected temperature value to the host computer. The host computer compares the set temperature value and the temperature collection value based on the preset temperature error accuracy for review.

[0070] The step S6 is specifically as follows:

[0071] The host computer sets pressure calibration points V51 and V52, and the MCU outputs corresponding voltage signals to the lithium battery detection equipment through the digital-to-analog conversion circuit to simulate the potential difference generated when the pressure sensor is subjected to pressure; the MCU collects the actual value V61 and V62 of the pressure simulation signal through the DC tester, and the lithium battery detection equipment collects the pressure simulation signal acquisition value V71 and V72, and uploads the actual value V621, V62, V71 and V72 to the host computer; the host computer calculates the pressure calibration factor based on the actual value V61, V62, V71 and V72, and writes it into the lithium battery detection equipment for calibration.

[0072] The host computer sets the pressure calibration point V71 that needs to be reviewed, and the MCU outputs the corresponding voltage signal to the lithium battery detection equipment through the digital-to-analog conversion circuit. The lithium battery detection equipment collects the pressure analog signal acquisition value V81 and sends it to the host computer. The MCU collects the actual value V91 of the pressure analog signal through the DC tester and sends it to the host computer. The host computer compares the pressure analog signal acquisition value V81 and the actual value V91 of the pressure analog signal based on the preset pressure error accuracy for review.

[0073] In summary, the advantages of the present invention are:

[0074] The calibration review device includes a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe and a third probe. The main control board is connected to the first copper bar, the second copper bar, the third copper bar, the discharge source and the DC tester respectively. The second probe is connected to the second copper bar and the lithium battery detection device, the third probe is connected to the third copper bar and the lithium battery detection device, the first probe is connected to the first copper bar and the mains, and the discharge source is also connected to the first copper bar. When calibration review is required, the host computer is connected to the lithium battery detection device and the calibration review device through a switch, and the host computer controls the calibration review device to send a signal to the lithium battery detection device. The device outputs the corresponding set value, collects the corresponding actual value through the DC tester, obtains the collected value of the lithium battery testing device, and calculates the corresponding calibration factor based on the actual value and the collected value through a first-order function and writes it into the lithium battery testing device. Subsequently, the lithium battery testing device can output the calibrated collected value based on the calibration factor. After the calibration is completed, the corresponding points are set for review and verification, and finally the voltage, charging current, discharge current, temperature collection accuracy and pressure signal accuracy are automatically calibrated and reviewed. Compared with traditional manual operations, the efficiency and reliability of the calibration review of the lithium battery testing equipment are greatly improved.

[0075] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An automatic calibration and verification device for lithium battery testing equipment, characterized in that: It includes a main control board, a DC tester, a discharge source, a first copper bar, a second copper bar, a third copper bar, a first probe, a second probe and a third probe; The main control board includes an MCU, a switching circuit, a signal source, a power supply circuit, a digital-to-analog conversion circuit and an RS232 interface; One end of the first copper bar is connected to the first probe, and the other end is connected to the discharge source and the power supply circuit; one end of the second copper bar is connected to the second probe, and the other end is connected to the signal source; one end of the third copper bar is connected to the third probe, and the other end is connected to the signal source; one end of the RS232 interface is connected to the MCU, and the other end is connected to the DC tester; one end of the power supply circuit is connected to the MCU, and the other end is connected to the first copper bar; the switching circuit is respectively connected to the MCU, the signal source and the discharge source; the digital-to-analog conversion circuit is connected to the MCU.

2. The automatic calibration and verification device for lithium battery testing equipment according to claim 1, characterized in that: The model of the MCU is STM32F429.

3. The automatic calibration and verification device for lithium battery testing equipment according to claim 1, characterized in that: The model of the DC tester is Hangzhi PIU600V.

4. The automatic calibration and verification device for lithium battery testing equipment according to claim 1, characterized in that: The model of the discharge source is Mean Well RSP-1500-5.

5. A method for automatic calibration and verification of lithium battery testing equipment, characterized in that: The method requires the use of a calibration verification device as described in any one of claims 1 to 4, comprising the following steps: Step S1, the host computer is connected to the lithium battery detection device and the calibration verification device through the switch, the lithium battery detection device is connected to the calibration verification device through the second probe and the third probe, and the calibration verification device is connected to the mains through the first probe; Step S2, the host computer controls the calibration and verification device to perform voltage calibration and verification on the lithium battery testing equipment; Step S3, the host computer controls the calibration and verification device to perform calibration and verification on the charging current of the lithium battery testing equipment; Step S4, the host computer controls the calibration and verification device to perform calibration and verification on the discharge current of the lithium battery testing equipment; Step S5: The host computer controls the calibration verification device to verify the temperature acquisition accuracy of the lithium battery detection equipment; Step S6: The upper computer controls the calibration and verification device to perform calibration and verification on the pressure signal accuracy of the lithium battery testing equipment; The steps S2 to S6 are performed in no particular order.

6. A lithium battery testing equipment automatic calibration and verification method as claimed in claim 5, characterized in that: The step S2 is specifically as follows: The host computer controls the lithium battery detection device to output the set voltage value V11 and the set voltage value V12 to the calibration review device, and the MCU collects the actual voltage value V21 and the actual voltage value V22 through the DC tester and uploads them to the host computer. The host computer calculates the voltage calibration factor based on the set voltage value V11, the set voltage value V12, the actual voltage value V21 and the actual voltage value V22 and writes it into the lithium battery detection device for calibration; The host computer controls the lithium battery detection equipment to output the set voltage value V31 to the calibration review device. The MCU collects the actual voltage value V41 through the DC tester and uploads it to the host computer. The host computer compares the set voltage value V31 and the actual voltage value V41 based on the preset voltage error accuracy for review.

7. The method for automatic calibration and verification of lithium battery testing equipment according to claim 5, characterized in that: The step S3 is specifically as follows: The host computer controls the lithium battery detection device to output the set charging current value I11 and the set charging current value I12 to the calibration review device, and the MCU collects the actual charging current value I21 and the actual charging current value I22 through the DC tester and uploads them to the host computer. The host computer calculates the charging current calibration factor based on the set charging current value I11, the set charging current value I12, the actual charging current value I21 and the actual charging current value I22, and writes it into the lithium battery detection device for calibration; The host computer controls the lithium battery detection equipment to output the set charging current value I31 to the calibration review device. The MCU collects the actual charging current value I41 through the DC tester and uploads it to the host computer. The host computer compares the set charging current value I31 and the charging current value I41 based on the preset charging current error accuracy for review.

8. The method for automatic calibration and verification of lithium battery testing equipment according to claim 5, characterized in that: The step S4 is specifically as follows: The host computer controls the lithium battery detection device to output the set discharge current value I51 and the set discharge current value I52 to the calibration review device, and the MCU collects the actual discharge current value I61 and the actual discharge current value I62 through the DC tester and uploads them to the host computer. The host computer calculates the discharge current calibration factor based on the set discharge current value I51, the set discharge current value I52, the actual discharge current value I61 and the actual discharge current value I62, and writes it into the lithium battery detection device for calibration; The host computer controls the lithium battery detection equipment to output the set discharge current value I71 to the calibration review device. The MCU collects the actual discharge current value I81 through the DC tester and uploads it to the host computer. The host computer compares the set discharge current value I71 and the actual discharge current value I81 based on the preset discharge current error accuracy for review.

9. The method for automatic calibration and verification of lithium battery testing equipment according to claim 5, characterized in that: The step S5 is specifically as follows: The host computer sets the set temperature value that needs to be reviewed, and controls the calibration review device to output the analog voltage signal corresponding to the set temperature value to the lithium battery detection equipment through the digital-to-analog conversion circuit. The temperature detection module of the lithium battery detection equipment sends the collected temperature value to the host computer. The host computer compares the set temperature value and the temperature collection value based on the preset temperature error accuracy for review.

10. The automatic calibration and verification method for lithium battery testing equipment according to claim 5, characterized in that: The step S6 is specifically as follows: The host computer sets pressure calibration points V51 and V52, and the MCU outputs corresponding voltage signals to the lithium battery detection equipment through the digital-to-analog conversion circuit to simulate the potential difference generated when the pressure sensor is subjected to pressure; the MCU collects the actual value V61 and V62 of the pressure simulation signal through the DC tester, and the lithium battery detection equipment collects the pressure simulation signal acquisition value V71 and V72, and uploads the actual value V621, V62, V71 and V72 to the host computer; the host computer calculates the pressure calibration factor based on the actual value V61, V62, V71 and V72, and writes it into the lithium battery detection equipment for calibration. The host computer sets the pressure calibration point V71 that needs to be reviewed, and the MCU outputs the corresponding voltage signal to the lithium battery detection equipment through the digital-to-analog conversion circuit. The lithium battery detection equipment collects the pressure analog signal acquisition value V81 and sends it to the host computer. The MCU collects the actual value V91 of the pressure analog signal through the DC tester and sends it to the host computer. The host computer compares the pressure analog signal acquisition value V81 and the actual value V91 of the pressure analog signal based on the preset pressure error accuracy for review.

Images