Battery test system

Abstract

The invention discloses a battery test system. The system comprises a control module, a voltage reduction and stabilization module and a test module, wherein the control module is used for receiving a test instruction and outputting a control voltage according to the test instruction; the voltage reduction and stabilization module is used for carrying out voltage reduction conversion on the voltage to be adjusted according to the accessed control voltage to obtain a test voltage and carrying out voltage stabilization processing on the test voltage; the test module is used for testing the to-be-tested battery by accessing a test voltage and sending test data of the to-be-tested battery to the control module through an output end of the test module; the control module is also used for receiving test data. According to the embodiment of the invention, overvoltage and undervoltage test items can be integrated in the comprehensive performance tester, so that the test efficiency is greatly improved by reducing the use number of equipment, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and particularly to a battery testing system. Background Art

[0002] In the modern battery manufacturing industry, the performance testing of finished and semi-finished batteries is a key link to ensure product quality and safety. However, the comprehensive performance testers currently used in the industry have certain functional limitations, that is, they do not have the ability to test overvoltage or undervoltage of single cells, resulting in the test process having to rely on an independent power meter to adjust the output of high voltage and low voltage to trigger the overvoltage and undervoltage protection mechanisms of the battery, so as to achieve the test purpose. This current test scheme has a low integration degree of test functions and requires a large number of test equipment, which easily leads to a decrease in test efficiency and production efficiency. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a battery testing system, which can integrate overvoltage and undervoltage test items into a comprehensive performance tester, so as to greatly improve the test efficiency by reducing the number of equipment used, and further effectively improve the production efficiency.

[0004] The embodiments of the present invention provide a battery testing system, including: a control module, a step-down voltage stabilizing module, and a testing module; wherein, the first input end of the step-down voltage stabilizing module is used to access the control voltage output by the control module, the second input end of the step-down voltage stabilizing module is used to access the voltage to be adjusted, and the output end of the step-down voltage stabilizing module is connected to the input end of the testing module;

[0005] The control module is configured to receive a test instruction and output the control voltage according to the test instruction;

[0006] The step-down voltage stabilizing module is configured to perform step-down conversion on the voltage to be adjusted according to the accessed control voltage to obtain a test voltage, and perform voltage stabilizing processing on the test voltage;

[0007] The testing module is configured to test the battery under test by accessing the test voltage, and send the test data of the battery under test to the control module through the output end of the testing module;

[0008] The control module is further configured to receive the test data.

[0009] Optionally, the step-down voltage stabilizing module includes: a first resistor, a second resistor, a third resistor, a synchronous step-down controller, and a power stage circuit;

[0010] The first end of the first resistor is the first input end of the step-down voltage stabilizing module;

[0011] The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded;

[0012] The first end of the third resistor is connected to the second end of the first resistor, and the second end of the third resistor is connected to the output end of the power stage circuit;

[0013] The feedback end of the synchronous buck controller is connected to the first end of the third resistor, the high-side drive end of the synchronous buck controller is connected to the high-side control end of the power stage circuit, and the low-side drive end of the synchronous buck controller is connected to the low-side control end of the power stage circuit;

[0014] The input end of the power stage circuit is the second input end of the buck voltage regulator module, and the output end of the power stage circuit is the output end of the buck voltage regulator module.

[0015] Optionally, the power stage circuit includes: a high-side switch, a low-side switch, and an inductor;

[0016] The control end of the high-side switch is the high-side control end of the power stage circuit, the input end of the high-side switch is the input end of the power stage circuit, and the output end of the high-side switch is connected to the first end of the inductor;

[0017] The control end of the low-side switch is the low-side control end of the power stage circuit, the input end of the low-side switch is connected to the first end of the inductor, and the output end of the low-side switch is grounded;

[0018] The second end of the inductor is the output end of the power stage circuit.

[0019] Optionally, both the high-side switch and the low-side switch are MOS transistors;

[0020] The control ends of the high-side switch and the low-side switch are both the gates of the MOS transistors;

[0021] The input ends of the high-side switch and the low-side switch are both the drains of the MOS transistors;

[0022] The output ends of the high-side switch and the low-side switch are both the sources of the MOS transistors.

[0023] Optionally, the voltage at the feedback end of the buck voltage regulator module is a fixed voltage reference point.

[0024] Optionally, the first resistor, the second resistor, and the third resistor intersect at a point to form a current intersection, and the relationship function between the control voltage and the test voltage is obtained by Kirchhoff's current law.

[0025] Optionally, the control module includes: a main control unit and an analog output unit;

[0026] The main control unit is configured to generate a control signal according to the received test instruction and send the control signal to the analog output unit;

[0027] The analog output unit is configured to perform digital-to-analog conversion on the received control signal to output the control voltage.

[0028] Optionally, the battery test system further includes: a host computer;

[0029] The host computer is configured to generate the test instruction and send the test instruction to the control module through the communication interface of the host computer;

[0030] The control module is further configured to send the test data to the host computer;

[0031] The host computer is further configured to receive the test data returned by the control module.

[0032] Optionally, the battery test system further includes: a voltage follower;

[0033] The input end of the voltage follower is connected to the output end of the control module, and the output end of the voltage follower is connected to the first input end of the buck and voltage stabilizing module.

[0034] Optionally, the test module includes: a test unit and a relay switch group;

[0035] The relay switch group is configured to change the connection state and the pressure application time between the test voltage and the test unit by controlling the on / off state of the switch;

[0036] The test unit is configured to test the battery under test by accessing the test voltage and send the test data of the battery under test to the control module.

[0037] Compared with the prior art, an embodiment of the present invention provides a battery testing system, which includes: a control module, a step-down and voltage-stabilizing module, and a testing module. Among them, the control module is configured to receive a test instruction and output a control voltage according to the test instruction. The step-down and voltage-stabilizing module is configured to step down the voltage to be regulated according to the accessed control voltage to obtain a test voltage, and perform voltage stabilization processing on the test voltage. The testing module is configured to test the battery under test by accessing the test voltage, and send the test data of the battery under test to the control module through the output end of the testing module. The control module is further configured to receive the test data. The embodiment of the present invention can integrate overvoltage and undervoltage test items into a comprehensive performance tester, so as to greatly improve the test efficiency by reducing the number of devices used, and further effectively improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of an embodiment of the existing test solution provided by the present invention;

[0039] Figure 2 is a schematic structural diagram of an embodiment of the comprehensive performance tester provided by the present invention;

[0040] Figure 3 is a schematic structural diagram of an embodiment of the battery testing system provided by the present invention;

[0041] Figure 4 is a schematic structural diagram of another embodiment of the battery testing system provided by the present invention;

[0042] Figure 5 is a schematic structural diagram of still another embodiment of the battery testing system provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art in the technical field of the present invention without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

[0044] See Figure 1 , which is a schematic structural diagram of an embodiment of the existing test solution provided by the present invention.

[0045] Figure 1The MCU chip therein is a Microcontroller Unit (MCU) chip, the PC host computer is a Personal Computer (PC) host computer, and the USB driver is a Universal Serial Bus (USB) driver. When the inventor implemented Figure 1 the existing test solution therein, it was found that while this test solution had insufficient functional integration, it also required the cooperation of multiple devices. During the testing process, frequently plugging and unplugging and switching different devices not only greatly increased the complexity of the test process but also easily caused operational redundancy and potential mistakes. This situation directly reduced the test efficiency and indirectly had a negative impact on the overall production efficiency.

[0046] See Figure 2 , which is a schematic structural diagram of an embodiment of the comprehensive performance tester provided by the present invention.

[0047] To solve the above problems, in the embodiment of the present invention, by adding a relevant test circuit for overvoltage / undervoltage (as shown in Figure 2 ), a battery test system is integrated in the comprehensive performance tester, so as to greatly improve the test efficiency by reducing the number of devices used, thereby effectively improving the production efficiency. In other words, on the basis of the existing conventional functions, the embodiment of the present invention further integrates the overvoltage and undervoltage test items into one, and only one comprehensive performance tester can complete the tests of all battery function items, thus significantly improving the test efficiency and the integration degree of test functions.

[0048] See Figure 3 , which is a schematic structural diagram of an embodiment of the battery test system provided by the present invention.

[0049] The embodiment of the present invention provides a battery test system, including: a control module 100, a step-down voltage stabilization module 200, and a test module 300; wherein, the first input end of the step-down voltage stabilization module is used to access the control voltage output by the control module, the second input end of the step-down voltage stabilization module is used to access the voltage to be regulated, and the output end of the step-down voltage stabilization module is connected to the input end of the test module;

[0050] The control module is configured to receive a test instruction and output the control voltage according to the test instruction;

[0051] The step-down voltage stabilization module is configured to perform step-down conversion on the voltage to be regulated according to the accessed control voltage to obtain a test voltage, and perform voltage stabilization processing on the test voltage;

[0052] The test module is used to test the battery under test by accessing the test voltage, and send the test data of the battery under test to the control module through the output end of the test module;

[0053] The control module is further configured to receive the test data.

[0054] Specifically, the battery test system integrated in the comprehensive performance tester includes, but is not limited to, a control module 100, a step-down voltage regulator module 200, and a test module 300.

[0055] When the control module receives a test instruction, it generates and outputs a control voltage to the step-down voltage regulator module according to the received test instruction; wherein, the test instruction includes: a control voltage value and a test response time; the control voltage is used to adjust the test voltage of the battery under test.

[0056] The step-down voltage regulator module receives the control voltage from the control module through its first input terminal, and accesses the voltage to be regulated through its second input terminal. The step-down voltage regulator module performs step-down conversion on the voltage to be regulated according to the control voltage, and outputs a stable test voltage to the test module. The step-down voltage regulator module in the embodiment of the present invention has a voltage stabilization function, which can ensure the stability of the test voltage to meet the accuracy requirements of battery testing.

[0057] The test module is the execution unit of the system, directly connected to the battery under test, and is used to complete the tests of the overvoltage and undervoltage items of the battery. The test module receives the test voltage from the step-down voltage regulator module through its input terminal and applies it to the battery under test. If the test voltage is a high voltage, an overvoltage test is performed, otherwise an undervoltage test is performed. After the test is completed, the test data of the battery under test (such as the response time for triggering protection and the state value after protection, etc.) is sent back to the control module through the output end of the test module. The control module receives the test data fed back by the test module, stores and analyzes the test data, or uploads the test data to the host computer or display terminal according to requirements for the user to view and further analyze.

[0058] See Figure 4 , which is a schematic structural diagram of another embodiment of the battery test system provided by the present invention.

[0059] In an alternative embodiment, the step-down voltage regulator module includes: a first resistor R1, a second resistor R2, a third resistor R3, a synchronous step-down controller 210, and a power stage circuit 220;

[0060] The first end of the first resistor is the first input terminal of the step-down voltage regulator module;

[0061] The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded;

[0062] The first end of the third resistor is connected to the second end of the first resistor, and the second end of the third resistor is connected to the output end of the power stage circuit;

[0063] The feedback end of the synchronous buck controller is connected to the first end of the third resistor, the high-side drive end of the synchronous buck controller is connected to the high-side control end of the power stage circuit, and the low-side drive end of the synchronous buck controller is connected to the low-side control end of the power stage circuit;

[0064] The input end of the power stage circuit is the second input end of the buck voltage regulator module, and the output end of the power stage circuit is the output end of the buck voltage regulator module.

[0065] Further, the voltage at the feedback end of the buck voltage regulator module is a fixed voltage regulation reference point.

[0066] Further, the first resistor, the second resistor, and the third resistor intersect at a point to form a current intersection, so as to obtain a relationship function between the control voltage and the test voltage through Kirchhoff's current law.

[0067] It should be noted that the synchronous buck controller 210 is responsible for adjusting the switching state of the power stage circuit according to the feedback signal V FB to achieve efficient bucking; the power stage circuit 220 includes a high-side switch and a low-side switch, and is used to convert the input voltage to be regulated into a target test voltage.

[0068] Specifically, the first end of the first resistor R1 serves as the first input end of the buck voltage regulator module and is used to receive the control voltage (denoted as VoutD) from the control module 100; the input end of the power stage circuit 220 serves as the second input end of the buck voltage regulator module and is used to connect the voltage to be regulated. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the first end of the third resistor R3 to form a feedback node (denoted as V FB ); the second end of the second resistor R2 is grounded, and the second end of the third resistor R3 is connected to the output end of the power stage circuit (output test voltage VOUT).

[0069] The feedback end of the synchronous buck controller directly monitors V FB , compares it with the internal voltage regulation threshold V REF , and generates a Pulse Width Modulation (PWM) signal to drive the high-side switch and the low-side switch. The voltage V FB at the feedback end of the synchronous buck controller is determined by the internal voltage regulation threshold V REFFixed to form a regulated reference point, that is, the synchronous buck controller dynamically adjusts the duty cycle of the power stage circuit through the PWM signal to ensure that V FB is always equal to V REF , thereby achieving the stability of the output voltage (test voltage VOUT).

[0070] According to Kirchhoff's current law, the following KCL equation is satisfied at the feedback node:

[0071]

[0072] In the embodiments of the present invention, the first resistor R1, the second resistor R2, and the third resistor R3 are all fixed values, and the above formula can be simply sorted out to obtain the relationship function between the test voltage VOUT and the control voltage VoutD. Obviously, by adjusting the control voltage VoutD (dynamically set by the control module), the test voltage VOUT output to the test module can be accurately controlled.

[0073] In the embodiments of the present invention, the control module first receives a test instruction, generates a specific control voltage VoutD, and connects it to the buck voltage regulator module; then, through the KCL equation at the feedback node, and the synchronous buck controller adjusts the switching timing of the power stage circuit and the duty cycle of the PWM according to the difference between the feedback node voltage V FB and the regulated threshold V REF , steps down the voltage to be regulated to the test voltage VOUT, and stabilizes the test voltage VOUT; then, the test module uses the stable test voltage VOUT to perform overvoltage / undervoltage tests on the battery under test, and transmits the test data back to the control module.

[0074] Combined with Figure 4 shown, as an alternative to the above solution, the battery test system further includes: a host computer;

[0075] The host computer is used to generate the test instruction and send the test instruction to the control module through the communication interface of the host computer;

[0076] The control module is further used to send the test data to the host computer;

[0077] The host computer is further used to receive the test data returned by the control module.

[0078] Further, the control module includes: a main control unit and an analog output unit;

[0079] The main control unit is used to generate a control signal according to the received test instruction and send the control signal to the analog output unit;

[0080] The analog output unit is configured to perform digital-to-analog conversion on the received control signal to output the control voltage.

[0081] It should be noted that the main control unit 110 is usually a microcontroller (MCU), which is configured to receive test instructions (such as control voltage values) sent by a host computer (such as a PC host computer), and send the digital control value (such as DAC code value) corresponding to the control voltage value to the analog output unit (such as a digital-to-analog converter DAC). The analog output unit converts the digital control value into an analog control voltage and inputs it to the first input terminal of the buck and voltage regulation module. The test module collects test data of overvoltage / undervoltage tests of the battery under test and sends it to the main control unit. The main control unit packages the test data and sends it back to the host computer through the communication interface for interface display or further analysis.

[0082] Combined with Figure 4 As shown in the figure, as an alternative to the above solution, the battery test system further includes: a voltage follower;

[0083] The input terminal of the voltage follower is connected to the output terminal of the control module, and the output terminal of the voltage follower is connected to the first input terminal of the buck and voltage regulation module.

[0084] It should be noted that in the embodiment of the present invention, the voltage follower isolates the control module and the buck and voltage regulation module to avoid mutual interference, so as to ensure that the control voltage VoutD is transmitted to the buck and voltage regulation module without loss, thereby improving the reliability and accuracy of the test data.

[0085] Combined with Figure 4 As shown in the figure, as an alternative to the above solution, the test module includes: a test unit and a relay switch group;

[0086] The relay switch group is configured to change the connection state and the pressure application time between the test voltage and the test unit by controlling the on / off state of the switch;

[0087] The test unit is configured to test the battery under test by accessing the test voltage and send the test data of the battery under test to the control module.

[0088] It should be noted that the input terminal of the relay switch group is connected to the output terminal of the buck and voltage regulation module to receive the test voltage VOUT; the output terminal of the relay switch group is connected to the input terminal of the test unit, and can determine whether the test unit is connected to the test voltage by controlling the on / off state of the switch to perform overvoltage / undervoltage tests on the battery under test, and can also accurately control the duration of the test voltage applied to the battery under test (i.e., the test response time). The control terminal of the relay switch group is connected to the control module to receive switch commands to achieve automated testing, reduce the complexity of manual operations, and improve the test efficiency.

[0089] The test unit is connected to the test voltage, and during the voltage application process, the test unit monitors the battery parameters in real time and sends the test data to the control module.

[0090] See Figure 5 , which is a schematic structural diagram of another embodiment of the battery test system provided by the present invention.

[0091] In an alternative embodiment, the power stage circuit includes: a high-side switch, a low-side switch, and an inductor;

[0092] The control end of the high-side switch is the high-side control end of the power stage circuit, the input end of the high-side switch is the input end of the power stage circuit, and the output end of the high-side switch is connected to the first end of the inductor;

[0093] The control end of the low-side switch is the low-side control end of the power stage circuit, the input end of the low-side switch is connected to the first end of the inductor, and the output end of the low-side switch is grounded;

[0094] The second end of the inductor is the output end of the power stage circuit.

[0095] Further, both the high-side switch and the low-side switch are MOS transistors;

[0096] The control ends in both the high-side switch and the low-side switch are the gates of the MOS transistors;

[0097] The input ends in both the high-side switch and the low-side switch are the drains of the MOS transistors;

[0098] The output ends in both the high-side switch and the low-side switch are the sources of the MOS transistors.

[0099] In Figure 5 , the control end (gate) of the high-side switch (10) is connected to the high-side drive end of the synchronous buck controller 210 to receive the PWM signal; the input end (drain) of the high-side switch (10) is directly connected to the voltage to be regulated (such as 24V); the output end (source) of the high-side switch (10) is connected to the first end of the inductor (11) and the input end (drain) of the low-side switch (9) to form a switching node SW.

[0100] The control end (gate) of the low-side switch (9) is connected to the low-side drive end of the synchronous buck controller to receive the complementary PWM signal; the input end (drain) of the low-side switch (9) is commonly connected to the output end (source) of the high-side switch (10) and the first end of the inductor at the switching node SW; the output end (source) of the low-side switch (9) is grounded to form a current loop.

[0101] The first end of the inductor (11) is connected to the switch node SW, and the second end of the inductor (11) serves as the output end of the power stage circuit, providing the stepped-down test voltage VOUT to the test module. The inductor (11) is an energy storage component used to smooth the test voltage VOUT.

[0102] When the high-side switch transistor (10) is turned on, the current flows from 24V → inductor → load; when the low-side switch transistor (9) is turned on, the inductor releases energy → load → ground; the alternating operation of the two can stably output the test voltage VOUT.

[0103] To better understand the technical solutions in the embodiments of the present invention, the following Figure 5 expands on a specific application example of the given battery test system:

[0104] In Figure 5 : The host computer 400 corresponds to the PC host computer (1), the main control unit 110 corresponds to the MCU (2), the analog output unit 120 corresponds to the DAC (3); the voltage follower 500 is denoted as (4); the first resistor R1 corresponds to the resistor (5), the second resistor R2 corresponds to the resistor (6), the third resistor R3 corresponds to the resistor (7); the synchronous buck controller 210 corresponds to the buck controller IC (8); the power stage circuit 220 is composed of the high-side switch transistor (10), the low-side switch transistor (9) and the inductor (11); the voltage to be regulated is 24V; the relay switch group 320 corresponds to the relay switches (12) and (13), and the test unit 310 is denoted as (14).

[0105] In the PC host computer (1), test instructions for the test product to reach overvoltage / undervoltage (such as control voltage value and test response time) are written and sent to the lower computer MCU hardware environment through USB communication. After receiving the test instructions, the MCU (2) controls the DAC chip (3) to output the corresponding analog voltage (control voltage VoutD). After passing through the voltage follower (4), the analog voltage (VoutD) forms a control current I1 through the resistor (5) and flows into the feedback node FB. The feedback pin of the buck controller IC (8) detects the feedback signal V FB . The buck controller IC (8) adjusts the switching frequencies of the two associated MOS transistors (9) and (10) according to the feedback signal V FB and, combined with the energy storage function of the inductor (11), steps down the input 24V voltage (the voltage to be regulated) to the target voltage value required by the host computer instruction (i.e., the test signal VOUT). At the same time, the test signal VOUT also controls the current I2 to flow into the feedback node FB through the resistor (7). Since the feedback signal V FB is connected to the inverting input terminal of the internal error amplifier of the buck controller IC (8), and its voltage stabilization threshold is fixed at 1.215V. Therefore, the feedback signal VFB Keep stable. Based on Kirchhoff's Current Law (KCL), the analog voltage output by the DAC (3) (i.e., the control voltage VoutD) is adjusted to control the voltage value required by the step-down output for the host computer (i.e., the test signal VOUT). The test signal VOUT is further injected into the product battery through the relay switches (12) and (13) to trigger the overvoltage / undervoltage protection mechanism. At the same time, the MCU (2) will collect the response time of the product battery to trigger protection and the status value after protection, and transmit these test data back to the PC host computer (1) to determine whether the product function is normal, thus forming a closed-loop feedback loop for the entire system.

[0106] Specifically, the PC host computer (1) is connected and communicates with the MCU module (2) through a USB cable. The MCU module (2) is connected to the DAC module (3), and the control voltage VoutD is given to the output of the voltage follower (4). Since the V FB of the synchronous step-down IC (8) is the regulated voltage threshold of 1.215V, the current I1 flowing through the resistor (5) is controlled by VoutD, where I1=(VoutD - 1.215) / R(5), and the V FB controls the current I3 flowing through the resistor (6) as I3 = 1.215 / R(6). At the same time, the synchronous step-down IC (8) controls the switching frequencies of the MOS transistors (9) and (10), steps down the 24V output to the inductor (11), and the voltage VOUT output by the inductor (11) controls the current I2 flowing through the resistor (7), where I2=(VOUT - 1.215) / R(7).

[0107] According to Kirchhoff's Current Law (KCL), we get I1 + I2 = I3, as shown below:

[0108] (VoutD - 1.215) / R(5)+(VOUT - 1.215) / R(7)=1.215 / R(6);

[0109] R(5), R(6), and R(7) are fixed values. Thus, by controlling the value of VoutD, the high voltage Vout1 and low voltage Vout2 of the output VOUT are adjusted. VOUT is then output to the test unit (14) through the relay switch (12) and the relay switch (13) respectively for product testing. At the same time, the MCU (2) is connected to the test unit (14) to form a closed-loop feedback system. After reading the test data (such as the product status value), it is then transmitted to the PC host computer (1) to determine the final result.

[0110] Therefore, the embodiment of the present invention can, on the basis of the existing conventional functions, further integrate the overvoltage and undervoltage test items into one. Only one comprehensive performance tester is required to complete the testing of all the function items of the battery (without the need to add additional equipment), thus significantly improving the test efficiency and the integration degree of test functions.

[0111] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A battery testing system, characterized in that, Including: A control module, a step-down voltage regulator module, and a test module; wherein, the first input terminal of the step-down voltage regulator module is used to connect to the control voltage output by the control module, the second input terminal of the step-down voltage regulator module is used to connect to the voltage to be regulated, and the output terminal of the step-down voltage regulator module is connected to the input terminal of the test module; The control module is used to receive a test instruction and output the control voltage according to the test instruction; The step-down voltage regulator module is used to perform step-down conversion on the voltage to be regulated according to the connected control voltage to obtain a test voltage, and perform voltage stabilization processing on the test voltage; The test module is used to test the battery under test by connecting to the test voltage, and send the test data of the battery under test to the control module through the output terminal of the test module; The control module is further used to receive the test data.

2. The battery test system according to claim 1, wherein The step-down voltage regulator module includes: a first resistor, a second resistor, a third resistor, a synchronous step-down controller, and a power stage circuit; The first end of the first resistor is the first input terminal of the step-down voltage regulator module; The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded; The first end of the third resistor is connected to the second end of the first resistor, and the second end of the third resistor is connected to the output terminal of the power stage circuit; The feedback terminal of the synchronous step-down controller is connected to the first end of the third resistor, the high-side drive terminal of the synchronous step-down controller is connected to the high-side control terminal of the power stage circuit, and the low-side drive terminal of the synchronous step-down controller is connected to the low-side control terminal of the power stage circuit; The input terminal of the power stage circuit is the second input terminal of the step-down voltage regulator module, and the output terminal of the power stage circuit is the output terminal of the step-down voltage regulator module.

3. The battery testing system according to claim 2, wherein, The power stage circuit includes: a high-side switch tube, a low-side switch tube, and an inductor; The control terminal of the high-side switch tube is the high-side control terminal of the power stage circuit, the input terminal of the high-side switch tube is the input terminal of the power stage circuit, and the output terminal of the high-side switch tube is connected to the first end of the inductor; The control terminal of the low-side switch tube is the low-side control terminal of the power stage circuit, the input terminal of the low-side switch tube is connected to the first end of the inductor, and the output terminal of the low-side switch tube is grounded; The second end of the inductor is the output terminal of the power stage circuit.

4. The battery testing system according to claim 3, wherein Both the high-side switch tube and the low-side switch tube are MOS tubes; The control terminals in both the high-side switch tube and the low-side switch tube are the gates of the MOS tubes; The input terminals in both the high-side switch tube and the low-side switch tube are the drains of the MOS tubes; The output terminals in both the high-side switch tube and the low-side switch tube are the sources of the MOS tubes.

5. The battery test system according to claim 2, wherein, The voltage at the feedback terminal of the step-down voltage regulator module is a fixed voltage stabilization reference point.

6. The battery testing system according to claim 2, wherein, The first resistor, the second resistor, and the third resistor intersect at a point to form a current intersection, so as to obtain the relationship function between the control voltage and the test voltage through Kirchhoff's current law.

7. The battery test system according to claim 1, wherein The control module includes: a main control unit and an analog output unit; The master control unit is configured to generate a control signal according to the received test instruction and send the control signal to the analog output unit; The analog output unit is configured to perform digital-to-analog conversion on the received control signal to output the control voltage.

8. The battery testing system according to claim 1, characterized in that, The battery test system further includes: a host computer; The host computer is configured to generate the test instruction and send the test instruction to the control module through the communication interface of the host computer; The control module is further configured to send the test data to the host computer; The host computer is further configured to receive the test data transmitted back by the control module.

9. The battery testing system according to claim 1, wherein The battery test system further includes: a voltage follower; The input end of the voltage follower is connected to the output end of the control module, and the output end of the voltage follower is connected to the first input end of the step-down voltage regulator module.

10. The battery testing system according to claim 1, wherein, The test module includes: a test unit and a relay switch group; The relay switch group is configured to change the connection state and the pressure application time between the test voltage and the test unit by controlling the on / off state of the switch; The test unit is configured to test the battery under test by applying the test voltage and send the test data of the battery under test to the control module.

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