A single cell voltage internal resistance measuring device

Abstract

The application belongs to the technical field of battery monitoring, and relates to a single battery voltage internal resistance measuring device.The application comprises an ARM chip module, a Bluetooth module, a communication address setting module, a state display module, a single battery internal resistance measuring circuit module, a single battery voltage measuring circuit module and a single battery temperature measuring circuit module; the single battery internal resistance measuring circuit module, the single battery voltage measuring circuit module and the single battery temperature measuring circuit are electrically connected with the ARM chip module; the single battery internal resistance measuring circuit module is connected with the positive and negative poles of the battery; the single battery voltage measuring circuit module is connected with the positive and negative poles of the battery, and the battery voltage is measured; the battery temperature measuring circuit is packaged together with the positive or negative terminal post of the battery, and the temperature of the battery terminal post is measured.The application has the advantages of simple structure, small size, simple wiring, convenient installation, faster and more reliable data transmission and less interference from the outside.

Description

Technical Field

[0001] This invention belongs to the field of battery monitoring technology and relates to a single-cell voltage internal resistance measuring device. Background Technology

[0002] Lead-acid batteries are commonly used as energy storage units in applications employing DC power supplies and UPS systems. Multiple batteries are typically connected in series; for example, in a DC 220V power system, 18 DC 12V batteries might be connected in series, or 104 DC 2V batteries might be connected in series. When batteries are connected in series, a malfunction in one battery can affect the normal operation of the entire battery pack. To ensure reliable system operation, it is necessary to monitor the operating status of each battery in real time, promptly identifying abnormal batteries such as those with low voltage, low capacity, excessive internal resistance, or open circuits. This provides a reference for operation and maintenance, allowing for the timely replacement of problematic batteries.

[0003] Existing technologies for single-cell voltage internal resistance measurement suffer from several drawbacks: high monitoring costs (traditional solutions require independent detection modules for each cell, leading to complex wiring and soaring costs); low measurement accuracy (most devices use AC injection, requiring expensive external excitation sources and are susceptible to electromagnetic interference); and lack of temperature monitoring (battery terminal temperature rise is a precursor to failure, but existing devices often lack integrated temperature sensors or use external probes, resulting in poor installation reliability). Furthermore, wired transmission solutions require extensive cabling in large battery packs, while single wireless modules lack stability in strong electromagnetic environments. Therefore, an integrated, low-cost, and interference-resistant online monitoring solution is urgently needed. Summary of the Invention

[0004] To address the problems of slow acquisition speed, low accuracy, susceptibility to interference, complex structure, large size, difficult wiring, and complicated installation in existing single-cell voltage internal resistance measurement devices, a single-cell voltage internal resistance measurement device is provided, comprising: an ARM chip module, a Bluetooth module, a communication address setting module, a status display module, a single-cell internal resistance measurement circuit module, a single-cell voltage measurement circuit module, and a single-cell temperature measurement circuit module.

[0005] The Bluetooth module, communication address setting module, status display module, single battery internal resistance measurement circuit module, single battery voltage measurement circuit module, and single battery temperature measurement circuit are electrically connected to the ARM chip module respectively.

[0006] The ARM chip module includes: an ARM chip U1, a debug interface module, a flash memory boot module, and a reset circuit module; the debug interface module, flash memory boot module, and reset circuit module are respectively connected to the ARM chip.

[0007] The single-cell internal resistance measurement circuit module is connected to the positive and negative terminals of the battery respectively to measure the battery's internal resistance; the single-cell voltage measurement circuit module is connected to the positive and negative terminals of the battery respectively to measure the battery voltage; the battery temperature measurement circuit is encapsulated together with the positive or negative terminal of the battery to measure the temperature of the battery terminals.

[0008] According to the single-cell voltage internal resistance measuring device described above, the ARM chip U1 model is STM32L031K6T6.

[0009] The debugging interface module includes interface H1; the model of interface H1 is HDR-F-2.54_1×4;

[0010] The flash memory boot module includes a fourth resistor R4;

[0011] The reset circuit module includes a third resistor R3 and a first capacitor C1;

[0012] Pin 1 of interface H1 is electrically connected to pin 1 of ARM chip U1; pin 3 of interface H1 is electrically connected to pin 32 of ARM chip U1 and then grounded.

[0013] One end of the fourth resistor R4 is electrically connected to pin 31 of the ARM chip U1; the other end of the fourth resistor R4 is electrically connected to one end of the first capacitor C1 and then grounded; the other end of the first capacitor C1 is electrically connected to pin 4 of the ARM chip U1 and one end of the third resistor R3; the other end of the third resistor R3 is electrically connected to pin 5 of the ARM chip U1 and then connected to a +3.3V voltage.

[0014] According to the single-cell voltage internal resistance measuring device described above, the Bluetooth module includes: a Bluetooth chip U2, model NRF24L01; pin 1 of the Bluetooth chip U2 is grounded; pin 3 of the Bluetooth chip U2 is electrically connected to pin 18 of the ARM chip U1; pin 5 of the Bluetooth chip U2 is electrically connected to pin 20 of the ARM chip U1; pin 7 of the Bluetooth chip U2 is electrically connected to pin 22 of the ARM chip U1; pin 2 of the Bluetooth chip U2 is connected to a +3.3V voltage; pin 4 of the Bluetooth chip U2 is electrically connected to pin 19 of the ARM chip U1; pin 6 of the Bluetooth chip U2 is electrically connected to pin 21 of the ARM chip U1; and pin 8 of the Bluetooth chip U2 is electrically connected to pin 13 of the ARM chip U1.

[0015] According to the single-cell voltage internal resistance measuring device described above, the communication address setting module includes a DIP switch SW1; the model of the DIP switch SW1 is DSHP08TSGER; pins 1-8 of the DIP switch SW1 are electrically connected to pins 15, 14, 30, 29, 28, 27, 26, and 25 of the ARM chip U1, respectively.

[0016] According to the single-cell voltage internal resistance measuring device described above, the status display module includes an indicator LED and a 43rd resistor R43; one end of the indicator LED is electrically connected to pin 12 of the ARM chip U1; the other end of the indicator LED is electrically connected to one end of the 43rd resistor R43; the other end of the 43rd resistor R43 is grounded.

[0017] According to the single-cell voltage internal resistance measuring device described above, the single-cell internal resistance measuring circuit module includes a first fuse F1, a first switching transistor Q1, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a tenth resistor R10, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a sixth operational amplifier U6, an eleventh capacitor C11, and a twelfth capacitor C10. 12. Thirteenth capacitor C13, Fourteenth capacitor C14, Sixteenth resistor R16, Seventeenth resistor R17, Eighteenth resistor R18, Nineteenth resistor R19, Eighth capacitor C8, Ninth capacitor C9, Tenth capacitor C10, Seventh operational amplifier U7, Twentieth resistor R20, Twenty-first resistor R21, Twenty-second resistor R22, Fifteenth capacitor C15, Sixteenth capacitor C16, Seventeenth capacitor C17, Eighteenth capacitor C18, Twenty-third resistor R23, Twenty-fourth resistor R24;

[0018] The first switching transistor Q1 is model MCQ4406A-AP; the sixth operational amplifier U6 and the seventh operational amplifier U7 are both model TLC2252CDG4;

[0019] Pins 1-3 of the first switch Q1 are electrically connected to one end of the tenth resistor R10 and one end of the fifth resistor R5, respectively; the other end of the tenth resistor R10 is electrically connected to the negative terminal V- of the battery and one end of the seventh resistor R7, and then grounded; pin 4 of the first switch Q1 is electrically connected to one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is electrically connected to one end of the thirteenth resistor R13 and pin 10 of the ARM chip U1, respectively; the other end of the thirteenth resistor R13 is grounded; pins 5-8 of the first switch Q1 are electrically connected and then electrically connected to one end of the eleventh resistor R11; the other end of the eleventh resistor R11 is electrically connected to one end of the first fuse F1; the other end of the first fuse F1 is electrically connected to the positive terminal V+ of the battery; The other end of the fifth resistor R5 is electrically connected to one end of the sixth resistor R6, one end of the fourth capacitor C4, and pin 5 of the sixth operational amplifier U6; the other end of the sixth resistor R6 is electrically connected to the stable reference voltage REF; the other end of the fourth capacitor C4 is grounded; the fifth capacitor C5 is connected in parallel across the seventh resistor R7; the other end of the seventh resistor R7 is electrically connected to one end of the eighth resistor R8 and pin 6 of the sixth operational amplifier U6; the sixth capacitor C6 is connected in parallel across the eighth resistor R8; the other end of the eighth resistor R8 is electrically connected to pin 7 of the sixth operational amplifier U6 and one end of the ninth resistor R9; the other end of the ninth resistor R9 is electrically connected to one end of the seventh capacitor C7 and pin 6 of the ARM chip U1; the other end of the seventh capacitor C7 is grounded.

[0020] Pin 3 of the seventh operational amplifier U7 is electrically connected to one end of the tenth capacitor C10, one end of the eighth capacitor C8, and one end of the sixteenth resistor R16; the other end of the sixteenth resistor R16 is electrically connected to one end of the eighteenth resistor R18 and one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is electrically connected to the positive terminal V+ of the battery; the eleventh capacitor C11 is connected in parallel with the twelfth capacitor C12; the other end of the eighteenth resistor R18 is electrically connected to the stable reference voltage REF and one end of the nineteenth resistor R19; the other end of the nineteenth resistor R19... One end of the fourteenth capacitor C14 and one end of the seventeenth resistor R17 are electrically connected; the other end of the seventeenth resistor R17 is electrically connected to the other end of the eighth capacitor C8, one end of the ninth capacitor C9, and pin 5 of the seventh operational amplifier U7; the other end of the ninth capacitor C9 is electrically connected to the other end of the tenth capacitor C10 and then grounded; the other end of the fourteenth capacitor C14 is electrically connected to the negative terminal V- of the battery; the thirteenth capacitor C13 is connected in parallel with the fourteenth capacitor C14; pin 2 and pin 1 of the seventh operational amplifier U7 and one end of the twentieth resistor R20 are electrically connected; Pin 4 of operational amplifier U7 is grounded; pin 8 of operational amplifier U7 is connected to +3.3V; pins 6 and 7 of operational amplifier U7 are electrically connected to one end of resistor R21; the other end of resistor R20 is electrically connected to one end of resistor R22, one end of capacitor C15, one end of capacitor C16, and pin 3 of operational amplifier U6; the other end of capacitor C15 is grounded; pin 2 of operational amplifier U6 is connected to the other end of capacitor C16 and resistor R21. The other end of R21 is electrically connected to one end of the twenty-fourth resistor R24; the seventeenth capacitor C17 is connected in parallel across the twenty-fourth resistor R24; the other end of the twenty-fourth resistor R24 ​​is electrically connected to pin 1 of the sixth operational amplifier U6 and one end of the twenty-third resistor R23; the other end of the twenty-third resistor R23 is electrically connected to one end of the eighteenth capacitor C18 and pin 7 of the ARM chip U1; the other end of the eighteenth capacitor C18 is grounded; pin 4 of the sixth operational amplifier U6 is grounded; pin 8 of the sixth operational amplifier U6 is connected to a +3.3V voltage.

[0021] According to the single-cell voltage internal resistance measuring device described above, the single-cell voltage measuring circuit module includes a 26th resistor R26, a 27th resistor R27, and a 19th capacitor C19; one end of the 27th resistor R27 is electrically connected to one end of the 26th resistor R26 and pin 9 of the ARM chip U1; the other end of the 27th resistor R27 is electrically connected to the positive terminal V+ of the battery; the other end of the 26th resistor R26 is grounded; and the 19th capacitor C19 is connected in parallel across the two ends of the 26th resistor R26.

[0022] According to the single-cell voltage internal resistance measuring device described above, the single-cell temperature measuring circuit module includes: a 25th resistor R25, a 28th resistor R28, a 20th capacitor C20, and an NTC temperature sensor; one end of the 25th resistor R25 is electrically connected to the stable reference voltage REF; the other end of the 25th resistor R25 is connected to the positive or negative terminal of the battery; one end of the 28th resistor R28 and one end of the 20th capacitor C20 are electrically connected; the other end of the 20th capacitor C20 is grounded; the other end of the 28th resistor R28 is electrically connected to pin 8 of the ARM chip U1; the NTC temperature sensor is connected in parallel with the 20th capacitor C20.

[0023] According to the single-cell voltage internal resistance measuring device described above, the ARM chip U1 generates a PWM signal with a duty cycle of 50%, which controls the on / off state of the first switching transistor Q1 through pin 10 of the ARM chip U1; the third resistor R3 is a 5W cement resistor used as a load resistor; the tenth resistor R10 is a precision sampling resistor; and the stable reference voltage REF is DC3.2V.

[0024] The single-cell voltage internal resistance measuring device described above also includes a wired TTL communication module (TTL), which is electrically connected to the ARM chip module.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. Four-wire dual-parameter high-precision measurement. Compared with traditional two-wire voltage detection, this invention eliminates wire resistance errors through independent current / voltage paths at terminals 1-4. Combining the pulse current method with a differential amplifier circuit, the internal resistance measurement accuracy reaches ±1%, reducing costs compared to the AC injection method and eliminating the need for a signal generator.

[0027] 2. Dual-mode communication adapts to complex scenarios. Existing technologies use a single bus; this device integrates a Bluetooth module and a wired TTL communication module. Wireless mode supports a network of 256 nodes, significantly reducing cabling costs; in strong interference scenarios, wired cascading is available, with a bit error rate of <10⁻⁻⁶. 6 It has improved common-mode interference immunity compared to RS485.

[0028] 3. Modular design reduces deployment costs. Each module is small and directly connects to the battery terminals. Compared to centralized data acquisition boxes, it eliminates the need for multi-channel switches and shielded cables, reducing battery monitoring costs and shortening installation time.

[0029] 4. Temperature-Internal Resistance Synergistic Diagnosis. The NTC temperature sensor is integrated with the battery terminals in a single package, with a temperature measurement error of <±0.5℃. Combined with an internal resistance change rate model (ΔR / ΔT), it can provide early warning of battery thermal runaway, improving the fault identification rate compared to single voltage monitoring.

[0030] 5. Dynamically Scalable Architecture. Addresses can be set via DIP switch SW1, supporting seamless expansion to 255 modules. The ARM chip U1 dynamically allocates communication time slots, with a data acquisition cycle of <1 second per module, offering improved efficiency compared to master-slave polling, making it suitable for large systems such as 104-cell 2V battery packs. Attached Figure Description

[0031] Figure 1 This is a simplified structural diagram of a single-cell voltage internal resistance measuring device according to the present invention.

[0032] Figure 2 This is a schematic diagram of the ARM chip module structure of a single-cell voltage internal resistance measuring device according to the present invention.

[0033] Figure 3 This is a schematic diagram of the Bluetooth module of a single-cell voltage internal resistance measuring device according to the present invention.

[0034] Figure 4 This is a schematic diagram of the communication address setting module of a single-cell voltage internal resistance measuring device according to the present invention.

[0035] Figure 5 This is a schematic diagram of the status display module of a single-cell voltage internal resistance measuring device according to the present invention.

[0036] Figure 6 This is a partial structural diagram of the single-cell internal resistance measurement circuit module of a single-cell voltage internal resistance measurement device according to the present invention.

[0037] Figure 7 This is a schematic diagram of another part of the single-cell internal resistance measurement circuit module of a single-cell voltage internal resistance measurement device according to the present invention.

[0038] Figure 8 This is a schematic diagram of the single-cell voltage measurement circuit module of a single-cell voltage internal resistance measurement device according to the present invention.

[0039] Figure 9 This is a schematic diagram of the single-cell temperature measurement circuit module of a single-cell voltage internal resistance measuring device according to the present invention.

[0040] Figure 10 This is a simplified schematic diagram of the measurement circuit structure for measuring battery packs using a single-cell voltage internal resistance measuring device according to the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] like Figure 2 As shown: In the single-cell voltage internal resistance measuring device of this invention, the ARM chip U1 is an STM32L031K6T6, and interface H1 is the debugging interface. The chip's startup mode is set to flash memory startup via the fourth resistor R4. The third resistor R3 and the first capacitor C1 form the reset circuit of the ARM processor U1.

[0043] like Figure 3 As shown: Bluetooth module U2 is model NRF24L01, and modules share data through Bluetooth module U2.

[0044] like Figure 4 As shown: SW1 is an eight-bit surface mount DIP switch used to set the communication address of the measuring device. When using wireless communication, a maximum of 256 module addresses can be assigned.

[0045] like Figure 5 As shown: The LED indicator is the status indicator of the measuring device. The flashing status indicates the current fault and operating condition of the measuring device.

[0046] like Figure 6 , Figure 7 As shown. V+ is connected to the positive terminal of the battery, and V- is connected to the positive terminal of the battery. The ARM chip U1 generates a PWM signal with a 50% duty cycle, which controls the switching of the first switching transistor Q1 through pin 10 of the ARM chip U1. The third resistor R3 is a 5W cement resistor, used as a load resistor, and the tenth resistor R10 is a precision sampling resistor. If the current battery voltage is 12V, when the first switching transistor Q1 is switched on and off, the third resistor R3 and the tenth resistor R10 will simultaneously generate a pulsating current with a maximum peak current of about 4A. The differential circuit built by the sixth operational amplifier U6 samples the voltage across the sampling resistor: the tenth resistor R10. This voltage is converted into a digital signal through pin 6 of the ARM chip U1. Since the battery, the load resistor: the eleventh resistor R11, and the sampling resistor: the tenth resistor R10, and the battery internal resistance are all connected in series in the same loop, the current is equal. Due to the presence of the battery internal resistance, the pulsating current will generate a pulsating voltage. This voltage will be converted into a digital signal through the circuit built by the sixth operational amplifier U6 and the seventh operational amplifier U7, and then through pin 7 of the ARM chip U1. The signals generated simultaneously by the sampling resistor and the battery internal resistance are calculated to obtain the battery internal resistance information.

[0047] like Figure 8 As shown: the twenty-sixth resistor R26, the twenty-seventh resistor R27, and the nineteenth capacitor C19 constitute a single-cell voltage measurement circuit module.

[0048] like Figure 9As shown: the 25th resistor R25, the 28th resistor R28, the 20th capacitor C20, and the NTC temperature sensor constitute a single-cell temperature measurement circuit module. The 25th resistor R25 is connected in series with the external NTC temperature sensor, and the 20th capacitor C20 is connected in parallel with the NTC temperature sensor. Here, REF is a stable reference voltage of DC 3.2V. As the temperature changes, the voltage change at pin 8 of the ARM chip U1 is collected to calculate the temperature value.

[0049] like Figure 10 As shown: Each battery BT1-BTn is connected to a measuring device V1-Vn. This measuring device uses a four-wire measurement method, with two measuring wires leading out from the positive and negative terminals of each battery, and connected to terminals 1-4 of the measuring device. It measures the battery voltage and internal resistance. Additionally, an NTC temperature sensor is used to measure temperature, with its lead wire connected to terminals 5-6. The probe is encapsulated with either the positive or negative terminal as required, and measures the temperature of the battery terminals during use. Each measuring device has its address set via a DIP switch; the address is unique and cannot be repeated within a set of devices. The measuring devices can communicate wirelessly via an internal communication module, transmitting measurement data to the host computer and upper computer in a timely manner. If the application has special electromagnetic requirements, wired TTL serial communication can also be used, with sequential connection. A maximum of 255 measuring modules can be connected to the same battery group, measuring 255 batteries.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A single-cell voltage internal resistance measuring device, characterized in that, include: ARM chip module (100), Bluetooth module (200), communication address setting module (300), status display module (400), single battery internal resistance measurement circuit module (500), single battery voltage measurement circuit module (600), single battery temperature measurement circuit module (700). The Bluetooth module (200), communication address setting module (300), status display module (400), single battery internal resistance measurement circuit module (500), single battery voltage measurement circuit module (600), and single battery temperature measurement circuit (700) are electrically connected to the ARM chip module (100) respectively. The ARM chip module (100) includes: an ARM chip U1, a debug interface module (120), a flash memory boot module (130), and a reset circuit module (140); the debug interface module (120), the flash memory boot module (130), and the reset circuit module (140) are respectively connected to the ARM chip (110); The single-cell internal resistance measurement circuit module (500) is connected to the positive and negative terminals of the battery respectively to measure the battery internal resistance; the single-cell voltage measurement circuit module (600) is connected to the positive and negative terminals of the battery respectively to measure the battery voltage; the battery temperature measurement circuit (700) is encapsulated together with the positive or negative terminal of the battery to measure the temperature of the battery terminals.

2. The single-cell voltage internal resistance measuring device according to claim 1, characterized in that, The ARM chip U1 model is STM32L031K6T6; The debugging interface module (120) includes interface H1; the model of interface H1 is HDR-F-2.54_1×4; The flash memory boot module (130) includes a fourth resistor R4; The reset circuit module (140) includes a third resistor R3 and a first capacitor C1; Pin 1 of interface H1 is electrically connected to pin 1 of ARM chip U1; pin 3 of interface H1 is electrically connected to pin 32 of ARM chip U1 and then grounded. One end of the fourth resistor R4 is electrically connected to pin 31 of the ARM chip U1; the other end of the fourth resistor R4 is electrically connected to one end of the first capacitor C1 and then grounded; the other end of the first capacitor C1 is electrically connected to pin 4 of the ARM chip U1 and one end of the third resistor R3; the other end of the third resistor R3 is electrically connected to pin 5 of the ARM chip U1 and then connected to a +3.3V voltage.

3. The single-cell voltage internal resistance measuring device according to claim 2, characterized in that, The Bluetooth module (200) includes: Bluetooth chip U2, model NRF24L01; pin 1 of Bluetooth chip U2 is grounded; pin 3 of Bluetooth chip U2 is electrically connected to pin 18 of ARM chip U1; pin 5 of Bluetooth chip U2 is electrically connected to pin 20 of ARM chip U1; pin 7 of Bluetooth chip U2 is electrically connected to pin 22 of ARM chip U1; pin 2 of Bluetooth chip U2 is connected to +3.3V voltage; pin 4 of Bluetooth chip U2 is electrically connected to pin 19 of ARM chip U1; pin 6 of Bluetooth chip U2 is electrically connected to pin 21 of ARM chip U1; and pin 8 of Bluetooth chip U2 is electrically connected to pin 13 of ARM chip U1.

4. The single-cell voltage internal resistance measuring device according to claim 3, characterized in that, The communication address setting module (300) includes a DIP switch SW1; the model of the DIP switch SW1 is DSHP08TSGER; pins 1-8 of the DIP switch SW1 are electrically connected to pins 15, 14, 30, 29, 28, 27, 26, and 25 of the ARM chip U1, respectively.

5. A single-cell voltage internal resistance measuring device according to claim 4, characterized in that, The status display module (400) includes an LED indicator and a 43rd resistor R43; one end of the LED indicator is electrically connected to pin 12 of the ARM chip U1; the other end of the LED indicator is electrically connected to one end of the 43rd resistor R43; the other end of the 43rd resistor R43 is grounded.

6. A single-cell voltage internal resistance measuring device according to claim 5, characterized in that, The single-cell internal resistance measurement circuit module (500) includes a first fuse F1, a first switch Q1, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a tenth resistor R10, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a sixth operational amplifier U6, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a seventh operational amplifier U7, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a twenty-third resistor R23, and a twenty-fourth resistor R24. The first switching transistor Q1 is model MCQ4406A-AP; the sixth operational amplifier U6 and the seventh operational amplifier U7 are both model TLC2252CDG4; Pins 1-3 of the first switch Q1 are electrically connected to one end of the tenth resistor R10 and one end of the fifth resistor R5, respectively; the other end of the tenth resistor R10 is electrically connected to the negative terminal V- of the battery and one end of the seventh resistor R7, and then grounded; pin 4 of the first switch Q1 is electrically connected to one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is electrically connected to one end of the thirteenth resistor R13 and pin 10 of the ARM chip U1, respectively; the other end of the thirteenth resistor R13 is grounded; pins 5-8 of the first switch Q1 are electrically connected and then electrically connected to one end of the eleventh resistor R11; the other end of the eleventh resistor R11 is electrically connected to one end of the first fuse F1; the other end of the first fuse F1 is electrically connected to the positive terminal V+ of the battery; The other end of the fifth resistor R5 is electrically connected to one end of the sixth resistor R6, one end of the fourth capacitor C4, and pin 5 of the sixth operational amplifier U6; the other end of the sixth resistor R6 is electrically connected to the stable reference voltage REF; the other end of the fourth capacitor C4 is grounded; the fifth capacitor C5 is connected in parallel across the seventh resistor R7; the other end of the seventh resistor R7 is electrically connected to one end of the eighth resistor R8 and pin 6 of the sixth operational amplifier U6; the sixth capacitor C6 is connected in parallel across the eighth resistor R8; the other end of the eighth resistor R8 is electrically connected to pin 7 of the sixth operational amplifier U6 and one end of the ninth resistor R9; the other end of the ninth resistor R9 is electrically connected to one end of the seventh capacitor C7 and pin 6 of the ARM chip U1; the other end of the seventh capacitor C7 is grounded. Pin 3 of the seventh operational amplifier U7 is electrically connected to one end of the tenth capacitor C10, one end of the eighth capacitor C8, and one end of the sixteenth resistor R16; the other end of the sixteenth resistor R16 is electrically connected to one end of the eighteenth resistor R18 and one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is electrically connected to the positive terminal V+ of the battery; the eleventh capacitor C11 is connected in parallel with the twelfth capacitor C12; the other end of the eighteenth resistor R18 is electrically connected to the stable reference voltage REF and one end of the nineteenth resistor R19; the other end of the nineteenth resistor R19... One end of the fourteenth capacitor C14 and one end of the seventeenth resistor R17 are electrically connected; the other end of the seventeenth resistor R17 is electrically connected to the other end of the eighth capacitor C8, one end of the ninth capacitor C9, and pin 5 of the seventh operational amplifier U7; the other end of the ninth capacitor C9 is electrically connected to the other end of the tenth capacitor C10 and then grounded; the other end of the fourteenth capacitor C14 is electrically connected to the negative terminal V- of the battery; the thirteenth capacitor C13 is connected in parallel with the fourteenth capacitor C14; pin 2 and pin 1 of the seventh operational amplifier U7 and one end of the twentieth resistor R20 are electrically connected; Pin 4 of operational amplifier U7 is grounded; pin 8 of operational amplifier U7 is connected to +3.3V; pins 6 and 7 of operational amplifier U7 are electrically connected to one end of resistor R21; the other end of resistor R20 is electrically connected to one end of resistor R22, one end of capacitor C15, one end of capacitor C16, and pin 3 of operational amplifier U6; the other end of capacitor C15 is grounded; pin 2 of operational amplifier U6 is connected to the other end of capacitor C16 and resistor R21. The other end of R21 is electrically connected to one end of the twenty-fourth resistor R24; the seventeenth capacitor C17 is connected in parallel across the twenty-fourth resistor R24; the other end of the twenty-fourth resistor R24 ​​is electrically connected to pin 1 of the sixth operational amplifier U6 and one end of the twenty-third resistor R23; the other end of the twenty-third resistor R23 is electrically connected to one end of the eighteenth capacitor C18 and pin 7 of the ARM chip U1; the other end of the eighteenth capacitor C18 is grounded; pin 4 of the sixth operational amplifier U6 is grounded; pin 8 of the sixth operational amplifier U6 is connected to a +3.3V voltage.

7. A single-cell voltage internal resistance measuring device according to claim 6, characterized in that, The single-cell voltage measurement circuit module (600) includes a 26th resistor R26, a 27th resistor R27, and a 19th capacitor C19; one end of the 27th resistor R27 is electrically connected to one end of the 26th resistor R26 and pin 9 of the ARM chip U1; the other end of the 27th resistor R27 is electrically connected to the positive terminal V+ of the battery; the other end of the 26th resistor R26 is grounded; and the 19th capacitor C19 is connected in parallel across the two ends of the 26th resistor R26.

8. A single-cell voltage internal resistance measuring device according to claim 7, characterized in that, The single-cell temperature measurement circuit module (700) includes: a 25th resistor R25, a 28th resistor R28, a 20th capacitor C20, and an NTC temperature sensor; one end of the 25th resistor R25 is electrically connected to the stable reference voltage REF; the other end of the 25th resistor R25 is connected to the positive or negative terminal of the battery; one end of the 28th resistor R28 and one end of the 20th capacitor C20 are electrically connected; the other end of the 20th capacitor C20 is grounded; the other end of the 28th resistor R28 is electrically connected to pin 8 of the ARM chip U1; the NTC temperature sensor is connected in parallel with the 20th capacitor C20.

9. A single-cell voltage internal resistance measuring device according to claim 8, characterized in that, The ARM chip U1 generates a PWM signal with a 50% duty cycle, which controls the on / off state of the first switching transistor Q1 through pin 10 of the ARM chip U1; the third resistor R3 is a 5W cement resistor, used as a load resistor; the tenth resistor R10 is a precision sampling resistor; the stable reference voltage REF is DC 3.2V.

10. A single-cell voltage internal resistance measuring device according to claim 1 or 9, characterized in that, It also includes a wired TTL communication module, which is electrically connected to the ARM chip module (100).

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