A health assessment tester for lithium-ion batteries used in electric bicycles

Abstract

This utility model discloses a health assessment tester for lithium-ion batteries used in electric bicycles, belonging to the technical field of health assessment of lithium-ion batteries for electric bicycles. It includes a casing, an HMI (Human-Machine Interface) device, a battery testing module, and a printing module. The HMI device includes a processor and a touchscreen. The battery testing module includes a voltage internal resistance testing unit and an electronic load unit, which are connected to the processor of the HMI device. The voltage internal resistance testing unit includes a tester and a communication conversion unit. The processor controls the working timing of the voltage internal resistance testing unit and the electronic load unit, and receives their output results. The printing module is connected to the HMI device. This utility model solves the technical problems of limited testing accuracy, insufficient voltage acquisition accuracy leading to excessive measurement errors, and data quantification defects causing significant deviations in calculation results in existing technologies.

Description

Technical Field

[0001] This utility model belongs to the field of health assessment technology for lithium-ion batteries for electric bicycles, and particularly relates to a health assessment tester for lithium-ion batteries for electric bicycles. Background Technology

[0002] Currently, the testing equipment for health assessment of lithium-ion batteries that is applicable to the new regulations of the "Guidelines for Health Assessment of Lithium-ion Batteries for Electric Bicycles" is not yet mature. The procedure for health assessment of lithium-ion batteries for electric bicycles as specified in the document is as follows: first, check the appearance; second, check the labels; third, measure the internal resistance; fourth, measure the voltage; and fifth, calculate the capacity.

[0003] Existing technologies employ a multi-device collaborative approach to solve technical problems: traditional independent devices each perform a single function, and the entire evaluation process is completed through manual series operation. For example, the internal resistance testing device alone performs frequency control and contact separation measurement. During internal resistance testing, an AC current with a frequency of 1.0 kHz ± 0.1 kHz is applied to the positive and negative terminals of the battery for a duration of 1 to 5 seconds. Voltage measurement uses a voltage measuring device with a measurement accuracy of no less than ± 0.5% to directly detect the static voltage difference between the positive and negative terminals of the battery; the discharge test uses a resistive load to achieve constant current discharge.

[0004] In existing technologies, resistive loads completely convert electrical energy into heat energy during discharge, causing a rapid rise in equipment temperature, typically exceeding 60°C. This not only accelerates the aging process of internal components and shortens the overall lifespan of the equipment but also severely impacts the stability of the testing environment. More critically, resistive loads cannot respond quickly to rapidly changing loads, with step response times exceeding 200ms, far from meeting the rapid current adjustment accuracy requirements of the guidelines. This response lag directly leads to a significant deviation between the actual and set values ​​of the discharge current, drastically reducing the accuracy of the discharge test. Furthermore, the inherent accuracy error of the resistive load (typically ±1%) combined with the temperature drift effect further deteriorates the test accuracy, causing the actual deviation of the discharge current to exceed the acceptable range of ±2.5%.

[0005] However, existing technologies have the following problems:

[0006] First, existing technologies employ a separate testing device and collaborative model, which forces the evaluation process to be broken down into multiple independent operational steps. This requires operators to sequentially complete a complete cycle of "device connection, parameter setting, data recording, device switching, and reconnection," making it impossible to perform internal resistance testing and discharge testing in parallel, thus creating a significant bottleneck in serial testing. Each device switch requires recalibration and reconnection, which not only increases the risk of operational errors but also significantly reduces testing efficiency, making the entire evaluation process lengthy and prone to errors.

[0007] Second, there are inherent defects in the selection of components, such as the high heat generation and slow response of resistive loads during discharge, which leads to limited test accuracy and shortened equipment life.

[0008] Third, the voltage acquisition module has insufficient accuracy, and the asynchronous acquisition mechanism leads to excessive measurement errors.

[0009] Fourth, data quantification defects: the superposition of systematic errors between different devices and manual calculation errors leads to significant deviations in the calculated results of the internal resistance value and capacity attenuation rate required by the standard. Utility Model Content

[0010] The purpose of this utility model is to provide a health assessment tester for lithium-ion batteries used in electric bicycles, in order to solve the technical problems mentioned in the background art, such as the bottleneck of serial testing caused by independent testing devices, the limited testing accuracy caused by defective device selection, the excessive measurement error caused by insufficient voltage acquisition accuracy, and the significant deviation of calculation results caused by data quantization defects.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A health assessment tester for lithium-ion batteries used in electric bicycles includes a housing, an HMI (human-machine interface) device, a battery testing module, and a printing module;

[0013] The HMI (Human Machine Interface) device includes a processor and a touch screen, serving as the system's control and data storage center.

[0014] The battery testing module includes a voltage internal resistance testing unit and an electronic load unit, which are respectively connected to the processor of the HMI (Human Machine Interface) device via a communication bus; wherein:

[0015] The voltage internal resistance testing unit includes a tester and a communication conversion unit; the tester is connected to a communication bus through the communication conversion unit, and the tester is connected to the positive and negative terminals of the battery under test through a banana plug;

[0016] The processor controls the working timing of the voltage internal resistance test unit and the electronic load unit through the communication bus, and receives the output results of the voltage internal resistance test unit and the electronic load unit through the communication bus.

[0017] The printing module is connected to the HMI (Human Machine Interface) device and is used to print out the test results.

[0018] Preferably, the voltage internal resistance testing unit further includes a 5V power adapter and a four-wire testing cable; the tester is connected to the 5V power adapter and the communication conversion unit respectively, and the model of the tester is XDB0310G.

[0019] Preferably, the four-wire test cable includes two Kelvin clips that connect to the positive and negative terminals of the battery respectively, and four banana plugs that connect to the tester; the four banana plugs are respectively a current positive plug, a voltage positive plug, a current negative plug, and a voltage negative plug, and are connected to the tester through four banana plug holes on the front panel of the housing.

[0020] Preferably, the TTL communication interface of the tester is connected to the communication conversion unit via a data cable; the communication conversion unit is a TTL to 232 converter, and the communication conversion unit establishes a communication link with the processor of the HMI human-machine interface device through the 232+ and 232- interfaces.

[0021] Preferably, the electronic load unit includes an electronic load of model 1600w TBC-80k; the electronic load is connected to the battery under test through positive and negative terminals to achieve constant current discharge control.

[0022] Preferably, the electronic load has a built-in temperature sensor, a cooling fan, and a heat sink. The cooling fan is a 12V DC fan, and the heat sink is made of aluminum alloy.

[0023] Preferably, the touch screen is an MCSG touch screen, which is connected to the electronic load via RS232 communication protocol and to the voltage internal resistance test unit via communication conversion unit, and is used to set test parameters and display test results.

[0024] Preferably, the top of the housing is provided with a portable handle and the bottom is provided with an anti-slip pad; the front panel of the housing is provided with a USB interface; the housing is made of ABS engineering plastic.

[0025] Preferably, the printing module includes a thermal printer, which is connected to the HMI (Human Machine Interface) device via an RS485 communication interface.

[0026] Preferably, it also includes a 24V power adapter, which supplies power to the HMI human-machine interface device, electronic load unit and printing module through a power splitter.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] To address the bottleneck problem of serial testing caused by stand-alone testing devices in existing technologies, this invention integrates the voltage internal resistance testing unit and the electronic load unit into the same device, eliminating the technical defects of the traditional technology that requires a complete cycle of "device connection, parameter setting, data recording, device switching, and reconnection" in sequence. By controlling the working sequence of each testing unit through the processor of the HMI (Human-Machine Interface) device, the coordinated execution of internal resistance testing and discharge testing is achieved, solving the problem of serial testing bottleneck. All tests can be completed with a single connection, eliminating the device switching and recalibration steps, improving testing efficiency by more than 60%, and reducing the operation error rate by more than 80%.

[0029] To address the limitation in testing accuracy caused by defective component selection in existing technologies, this invention replaces traditional resistive loads with electronic load technology. The current adjustment range reaches 0.5–30A, and the testing accuracy is improved to 0.5%, effectively solving the technical problems of high heat generation and slow response of traditional resistive loads. Through an intelligent heat dissipation system consisting of an integrated 12V DC cooling fan, aluminum alloy heat sink, and temperature sensor, the stable operation of the equipment is ensured during long-term high-current discharge. The service life of the equipment is extended by more than 30%, and the stability of testing accuracy is significantly improved.

[0030] To address the issues of insufficient voltage acquisition accuracy and excessive measurement errors caused by asynchronous acquisition in existing technologies, this invention employs four-wire detection technology. By using a Kelvin clip to separate the current and voltage measurement paths, the accuracy of both voltage and internal resistance testing reaches 0.5%. Through TTL-to-232 communication conversion and the 485 communication protocol, the accuracy and synchronization of data transmission are ensured, eliminating measurement errors caused by asynchronous acquisition. The processor uniformly controls each test unit, achieving synchronized data acquisition and controlling the measurement error within ±0.5%, meeting industry standard requirements.

[0031] To address the issues of data quantification deficiencies and the superposition of systematic and manual calculation errors in existing technologies, this invention uses a processor to automatically calculate and display test results such as internal resistance and capacitance according to preset calculation formulas, completely eliminating manual calculation errors. All test data comes from a unified testing device, eliminating the problem of superposition of systematic errors between different devices, and improving the accuracy of calculation results by more than 90%. The thermal printer automatically generates standardized test reports, and the built-in file management system supports data export in Excel and PDF formats, ensuring the consistency and traceability of test data.

[0032] This utility model adopts an integrated design, electronic load technology, four-wire detection technology, and automated data processing approach. The system's capacity detection error is controlled within 0.5%, and all technical indicators meet the standard requirements of the Ministry of Industry and Information Technology's "Guidelines for Health Assessment of Lithium-ion Batteries for Electric Bicycles." The equipment uses an ABS engineering plastic shell, and the entire machine weighs no more than 3kg, making it easy to carry for on-site testing. The 800×480 pixel capacitive touch screen interface is simple and intuitive to operate, realizing efficient, accurate, and convenient integrated testing for the health assessment of lithium-ion batteries for electric bicycles. Attached Figure Description

[0033] Figure 1 This is an overall circuit block diagram of a preferred embodiment of the present utility model;

[0034] Figure 2 This is a circuit diagram of the voltage internal resistance testing unit in a preferred embodiment of the present invention;

[0035] Figure 3 This is a circuit diagram of the electronic load unit in a preferred embodiment of the present invention. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0037] like Figure 1 - Figure 3 As shown:

[0038] First preferred embodiment:

[0039] A health assessment tester for lithium-ion batteries used in electric bicycles includes a housing and:

[0040] HMI (Human Machine Interface) devices, battery testing module, and printing module;

[0041] The HMI (Human Machine Interface) device includes a processor and a touch screen, serving as the control and data processing center of the system.

[0042] The battery testing module includes a voltage internal resistance testing unit and an electronic load unit. The two testing units are respectively connected to the processor of the HMI human-machine interface device through a communication bus.

[0043] The processor controls the working timing of the voltage internal resistance test unit and the electronic load unit through the communication bus, and receives the output results of the voltage internal resistance test unit and the electronic load unit through the communication bus.

[0044] The printing module is connected to the HMI (Human Machine Interface) device and is used to print out the test results.

[0045] The voltage internal resistance testing unit includes a 5V power adapter, a tester XD, a four-wire test cable, and a communication conversion unit U5; it realizes power supply, signal transmission, and data communication.

[0046] Specifically, the figure shows the internal circuit connection diagram of the voltage internal resistance testing unit of the lithium-ion battery health assessment tester for electric bicycles of this utility model.

[0047] The power supply section of the voltage internal resistance test unit includes a 5V power adapter. The 5V power adapter is connected to the 220-L live wire and the 220-N neutral wire through the X2 interface and the X4 interface, respectively. The 5V DC power is distributed to the tester XD through the power line, providing a stable DC power supply for the entire test system.

[0048] The XD tester, as the core testing unit of the system, adopts a high-precision milliohm tester, model XDB0310G, which can simultaneously measure voltage and internal resistance. The XD tester has four test interfaces, corresponding to the positive current terminal, positive voltage terminal, negative current terminal, and negative voltage terminal, respectively. It connects to a four-wire test cable through four banana plugs on the front panel of the casing. Figure 2 (In simplified form, only one positive and one negative line are shown).

[0049] Specifically, the four-wire test cable includes: two Kelvin clips that connect to the positive and negative terminals of the battery respectively, and four banana plugs that connect to the tester XD; wherein, the four banana plugs are respectively the positive current plug, the positive voltage plug, the negative current plug, and the negative voltage plug, and are connected to the positive Kelvin clip and the negative Kelvin clip respectively through a composite cable.

[0050] Inside the Kelvin clip, wires from the positive current plug and the positive voltage plug are connected to the current contact and voltage contact of the positive clip, respectively, and wires from the negative current plug and the negative voltage plug are connected to the current contact and voltage contact of the negative clip, respectively.

[0051] During testing, the current line forms a current loop to apply a constant test current to the battery under test, and the voltage line forms a voltage detection loop to sample the voltage signal across the battery. The tester XD calculates the internal resistance value based on the measured voltage and current values.

[0052] The XDB0310G tester boasts a testing accuracy of 0.5% and an internal resistance testing time of less than 1 second, exhibiting rapid response characteristics. Combined with the processor's parallel control strategy, the system can quickly complete the internal resistance test during capacity testing, significantly improving overall testing efficiency. The XD tester has a testing range of 0.01mΩ to 200Ω and an adjustable testing current range of 1A to 10A, adaptable to the testing requirements of lithium-ion batteries with different capacities.

[0053] The TTL communication interface of the tester XD is connected to the communication conversion unit U5 via a data cable. The communication conversion unit U5 uses a TTL to RS232 converter to convert the TTL level signal generated by the tester XD into an RS232 level signal. The communication conversion unit U5 establishes a communication link with the processor of the HMI (Human Machine Interface) device through the RS232+ and RS232- interfaces to realize the real-time transmission, display and storage of test data.

[0054] The electronic load unit includes an electronic load; in this embodiment, the electronic load is a 1600W TBC-80K electronic load U3. The electronic load U3 is connected to the battery under test through positive and negative terminals to achieve constant current discharge control.

[0055] The electronic load U3 is the core component for discharge capacity testing, establishing an electrical connection with the battery under test via positive and negative interfaces. The electronic load U3 employs electronic load technology to achieve constant current discharge control of the battery under test. The current adjustment range of the electronic load is 0.5–30A, with a testing accuracy of 0.5%, enabling constant current discharge testing of the battery under test according to a set discharge current value. In this embodiment, the electronic load performs discharge testing at 50% of C0, where C0 is the rated capacity of the battery under test; the system's capacity detection error is 0.5%, meeting the standard requirements for lithium-ion battery capacity testing. The electronic load U3 is connected to the positive and negative terminals of the battery under test via positive and negative interfaces, forming a discharge circuit.

[0056] The electronic load U3 incorporates a temperature sensor, a cooling fan, and a heatsink to control temperature rise during prolonged high-current discharge. The cooling fan is a 12V DC fan. When the temperature sensor detects that the internal temperature exceeds a preset threshold, it sends a signal to the processor, which then controls the cooling fan to start or sends a stop command. The heatsink is made of aluminum alloy, increasing heat dissipation efficiency by expanding the heat dissipation area.

[0057] The HMI (Human-Machine Interface) device includes a processor and a touchscreen, serving as the system's control and data storage center. The touchscreen is used to input test parameters such as cutoff voltage, load current, test number, and rated capacity. After receiving the measurement data, the processor automatically calculates and displays test results such as internal resistance and capacity according to preset formulas. The processor of the HMI device receives real-time status information from each test unit via a communication bus. When an abnormal signal is received, an audible alert is emitted via a buzzer.

[0058] The HMI (Human Machine Interface) device is connected to the electronic load U3 via an RS232 communication interface to enable the distribution of test parameters and the uploading of test data. The HMI device is also connected to the voltage internal resistance test unit via a communication conversion unit to enable the control of the voltage internal resistance test unit and data acquisition.

[0059] In this embodiment, the touchscreen is an MCSG touchscreen, which is a capacitive touchscreen with a resolution of 800×480 pixels and supports multi-touch operation. The touchscreen interface integrates functional modules such as test parameter setting, real-time data display, historical record query, and test report generation, making it simple and intuitive to operate.

[0060] The processor of the HMI (Human-Machine Interface) device has a built-in file management system that can export test data to a USB flash drive for storage. The file management system supports multiple data export formats, including Excel and PDF. Specifically, the file management system can perform the following data export functions: single test report export, generating a file containing the complete data and results of the current test and exporting it to a USB flash drive; batch export of historical test data, filtering multiple test records stored in the system according to time or other conditions and then exporting them in batches; and test statistical analysis report export, generating an analysis report after statistically analyzing historical test data and then exporting it.

[0061] The printing module includes a thermal printer U4, which is connected to the HMI (Human Machine Interface) device via an RS485 communication interface for printing out test results.

[0062] The thermal printer U4 connects to the HMI (Human Machine Interface) device via 485+ and 485- communication interfaces for printing test results. The thermal printer receives test data from the processor of the HMI device, automatically generates a test report containing test parameters, test results, and test time, and prints it out. Specifically, the printed test report includes information such as test number, battery information, test parameter settings, internal resistance value, capacity value, and test conclusion; ensuring the traceability and archiving function of the test data.

[0063] The tester also includes a 24V power adapter U1, which supplies power to the HMI human-machine interface device, electronic load unit and printing module via a power splitter.

[0064] The power supply of the tester adopts a tiered power supply method, connected via 220V AC power, and connected to the 220-LX4 live wire and 220-N neutral wire via the -X2 and -X4 interfaces respectively. The 24V power adapter U1 converts AC power to DC power, providing a stable 24V operating voltage for all components. The output of the 24V power adapter U1 connects to the 24V power distributor X3, which distributes power to various functional modules such as the HMI (Human Machine Interface) device, electronic load U3, and thermal printer U4, ensuring coordinated and stable operation of all parts of the system.

[0065] The outer shell adopts a portable protective structure, and the shell material is ABS engineering plastic, which has the functions of drop protection, dustproof and waterproof. The whole machine weighs no more than 3kg, making it easy to carry for on-site testing. A portable handle is provided on the top of the shell, and an anti-slip pad is provided on the bottom to ensure stability and safety during use.

[0066] The front panel of the casing is equipped with a USB interface (not shown in the figure) for connecting a USB flash drive storage device. Through the cooperation of the USB interface and the file management system, convenient export and long-term storage of test data are achieved, providing a data interface for subsequent data analysis and system uploads.

[0067] The system employs high-precision measurement technology, achieving an accuracy of 0.5% in voltage testing, internal resistance testing, and capacity detection, meeting the technical requirements for health assessment of lithium-ion batteries used in electric bicycles. Test results are printed out using a thermal printer, ensuring the traceability and archiving of test data.

[0068] Working principle:

[0069] The working principle of this utility model's lithium-ion battery health assessment tester for electric bicycles is based on a comprehensive evaluation method combining battery internal resistance testing and capacity testing. The processor of the HMI (Human-Machine Interface) device uniformly controls the working timing of the voltage internal resistance testing unit and the electronic load unit, achieving a comprehensive assessment of the lithium-ion battery's health status.

[0070] The entire testing process includes five main stages: parameter setting, internal resistance testing, capacity testing, data analysis, and result output. After the user sets the test parameters via the touchscreen, the tester automatically executes the test program, collects key parameters such as battery voltage, internal resistance, and capacity, and calculates the battery health status assessment result through the processor.

[0071] Working principle of internal resistance test:

[0072] During internal resistance testing, the user inserts the banana plug end of the test clip into the banana socket on the front panel of the device according to the corresponding color, and clamps the Kelvin clips to the positive and negative terminals of the battery under test to establish a test circuit.

[0073] The voltage and internal resistance testing unit applies a test signal to the battery under test via a banana plug and a Kelvin clip, while simultaneously acquiring the voltage and current response signals across the battery. Based on the acquired voltage and current data, the tester calculates the voltage and internal resistance values ​​of the battery under test using a built-in algorithm.

[0074] Specifically, during the test, the current line forms a current loop (I+ / I-) to apply a constant test current to the battery under test, and the voltage line forms a voltage detection loop (V+ / V-) to sample the voltage signal across the battery. The tester XD calculates the internal resistance value based on the measured voltage and current values ​​using Ohm's law.

[0075] After the test is completed, the tester transmits the test results to the processor of the HMI human-machine interface device via the communication conversion unit and the communication bus. The processor displays the received voltage and internal resistance values ​​in the upper right area of ​​the touch screen, thus completing one internal resistance test process.

[0076] The entire internal resistance test process employs four-wire measurement technology, which effectively eliminates the influence of wire resistance and contact resistance on the test results, ensuring a test accuracy of 0.5%FS.

[0077] Working principle of discharge test:

[0078] During the discharge test, the user sets the test parameters, including cutoff voltage, load current, test number, and rated capacity, through the touchscreen of the HMI (Human Machine Interface) device. After setting the parameters, the user clicks the run button to start the test program.

[0079] After receiving the start command, the processor of the HMI (Human-Machine Interface) device sends test parameters and control commands to the electronic load unit via the communication bus. The electronic load unit then performs a constant current discharge test on the battery under test via the positive and negative interfaces, based on the received load current parameters.

[0080] During the discharge test, the electronic load unit continuously collects the battery's voltage and current data and transmits it to the processor in real time via the communication bus. The processor processes the measurement data according to the calculation formula required by the standard, calculates parameters such as battery capacity and degradation rate, and displays the voltage, current, capacity, degradation rate, and running time in real time on the touch screen interface.

[0081] Specifically, the electronic load unit discharges the battery at a constant current according to a preset discharge current (typically 50%C0, where C0 is the rated capacity of the battery under test), while simultaneously recording the discharge time and voltage changes. When the battery voltage reaches the cutoff voltage, the processor calculates the product of the discharge time and the discharge current to obtain the actual capacity value of the battery.

[0082] The processor continuously monitors the battery voltage. When it detects that the battery voltage is lower than the set cutoff voltage, it automatically sends a stop command to the electronic load unit to terminate the discharge test and simultaneously issues an audible alert via a buzzer. During the test, the user can also manually stop the test by clicking the run button again.

[0083] Data processing and output principles:

[0084] The tester employs multi-threaded parallel processing technology for data processing. The processor of the HMI (Human-Machine Interface) device can simultaneously process data from the voltage and internal resistance testing unit and the electronic load unit. Based on the test data, the processor calculates battery health status assessment results, including key indicators such as capacity retention rate and internal resistance growth rate.

[0085] Test results are output in two ways: one is in real-time display on the touchscreen, and the other is by printing a test report using a thermal printer. The printed test report includes information such as test number, battery information, test parameter settings, voltage value, internal resistance value, capacity value, and test conclusion, ensuring the traceability and archiving function of the test data.

[0086] Meanwhile, the tester supports exporting test data to a USB flash drive via a USB interface, and the file management system can generate test reports in Excel or PDF format, facilitating long-term data storage, analysis, and uploading to the management system.

[0087] Protection and security mechanisms:

[0088] The tester is equipped with multiple protection functions. The processor monitors the working status of each test unit in real time. When abnormal conditions such as abnormal voltage, overcurrent, or excessive temperature are detected, a stop command is automatically sent and an alarm is issued. In the first preferred embodiment, the cooling fan and temperature sensor of the electronic load unit ensure the stability and reliability of the equipment during long-term operation, preventing equipment damage or test data distortion due to overheating.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lithium ion battery health assessment tester for electric bicycles, characterized by: Includes the casing, HMI (Human Machine Interface) device, battery testing module, and printing module; The HMI (Human Machine Interface) device includes a processor and a touch screen, serving as the system's control and data storage center. The battery testing module includes a voltage internal resistance testing unit and an electronic load unit, which are respectively connected to the processor of the HMI (Human Machine Interface) device via a communication bus; wherein: The voltage internal resistance testing unit includes a tester and a communication conversion unit; the tester is connected to a communication bus through the communication conversion unit, and the tester is connected to the positive and negative terminals of the battery under test through a banana plug; The processor controls the working timing of the voltage internal resistance test unit and the electronic load unit through the communication bus, and receives the output results of the voltage internal resistance test unit and the electronic load unit through the communication bus. The printing module is connected to the HMI (Human Machine Interface) device and is used to print out the test results.

2. The health assessment tester for lithium-ion batteries used in electric bicycles according to claim 1, characterized in that: The voltage internal resistance testing unit also includes a 5V power adapter and a four-wire testing cable; the tester is connected to the 5V power adapter and the communication conversion unit respectively, and the model of the tester is XDB0310G.

3. The lithium ion battery health assessment tester for electric bicycles of claim 2, wherein: The four-wire test cable includes two Kelvin clips that connect to the positive and negative terminals of the battery, and four banana plugs that connect to the tester. The four banana plugs are a positive current plug, a positive voltage plug, a negative current plug, and a negative voltage plug, and are connected to the tester through four banana plug holes on the front panel of the housing.

4. The lithium-ion battery health assessment tester for electric bikes of claim 1, wherein: The TTL communication interface of the tester is connected to the communication conversion unit via a data cable; the communication conversion unit is a TTL to 232 converter, and the communication conversion unit establishes a communication link with the processor of the HMI human-machine interface device through the 232+ and 232- interfaces.

5. The lithium-ion battery health assessment tester for electric bicycles of claim 1, wherein: The electronic load unit includes an electronic load of model 1600w TBC-80k; the electronic load is connected to the battery under test through positive and negative terminals.

6. The lithium ion battery health assessment tester for electric bikes of claim 5, wherein: The electronic load has a built-in temperature sensor, a cooling fan, and a heat sink. The cooling fan is a 12V DC fan, and the heat sink is made of aluminum alloy.

7. The lithium-ion battery health assessment tester for electric bikes of claim 1, wherein: The touchscreen is an MCSG touchscreen, which is connected to the electronic load via an RS232 communication interface and to the voltage internal resistance test unit via a communication conversion unit, and is used to set test parameters and display test results.

8. The health assessment tester for lithium-ion batteries used in electric bicycles according to claim 1, characterized in that: The outer casing is equipped with a portable handle on the top and an anti-slip pad on the bottom; the front panel of the outer casing is equipped with a USB interface; the outer casing is made of ABS engineering plastic.

9. The lithium-ion battery health assessment tester for electric bikes of claim 1, wherein: The printing module includes a thermal printer, which is connected to the HMI (Human Machine Interface) device via an RS485 communication interface.

10. The lithium-ion battery health assessment tester for electric bikes of claim 1, wherein: It also includes a 24V power adapter, which supplies power to the HMI human-machine interface device, electronic load unit and printing module via a power splitter.

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