Battery sample device capable of recovering discharge capacity

Abstract

The utility model discloses a battery sample device with repeatable discharge capacity, which is provided with a battery, a main control unit and a switch unit, the main control unit comprises a voltameter module and a circuit control chip, the circuit control chip receives the discharge capacity of the battery detected by the voltameter module, and the circuit control chip controls the on-off of the switch unit according to the discharge capacity. And the discharge capacity of the battery is sent to the external terminal, so that the electricity meter module can accurately record the discharge capacity of the battery and can reproduce the discharge capacity so as to obtain a discharge capacity test result of the battery sample device, the circuit has the characteristics of simple structure and convenience in operation, and the working stability of the battery sample device is improved to a certain extent.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing technology, and in particular relates to a battery sample device with re-discharge capacity. Background Technology

[0002] The discharge capacity of lithium-ion batteries is a crucial indicator of their performance. Many domestic and international standards specify testing methods for the discharge capacity of lithium-ion batteries under different conditions, such as: room temperature discharge capacity, high and low temperature discharge capacity, rate discharge capacity, cycle life, and capacity recovery capability after storage. Furthermore, the discharge capacity of the battery is also required for calculating indicators such as energy density and energy conversion efficiency.

[0003] However, the discharge capacity of lithium-ion batteries is affected by various factors. In laboratory testing, the results often deviate significantly from the actual situation, highlighting the inadequacy of laboratory testing capabilities. The lack of technical means prevents verification and evaluation of these capabilities. Factors affecting the accuracy of battery discharge capacity testing can be broadly categorized into environment, equipment, and testing methods. First, battery discharge capacity varies considerably under different ambient temperatures. Second, testing equipment typically calibrates only voltage and current during measurement, neglecting the crucial parameter of time required for capacity calculation. Factors such as time accuracy and sampling intervals can prevent the equipment from accurately measuring battery discharge capacity. Therefore, there is an urgent need for a battery sample device capable of re-discharging capacity to address the problem of accurately testing the discharge capacity of reproducible batteries. Utility Model Content

[0004] In view of this, the present invention provides a battery sample device with re-discharge capacity, which can solve the problem of the difficulty in reproducing the discharge capacity test of batteries in the prior art. The battery sample device uses a fuel gauge module to accurately record the discharge capacity and actively cuts off the discharge circuit after the set capacity is reached, thus accurately reproducing the discharge capacity data and improving the accuracy of discharge capacity test. The specific technical solution adopted is as follows.

[0005] This utility model provides a battery sample device with re-discharge capacity. The battery sample device includes a battery, a main control unit, and a switching unit. The main control unit includes a fuel gauge module and a circuit control chip connected to the fuel gauge module. The battery is connected to the fuel gauge module. The circuit control chip includes a control interface module and a communication interface module. The control interface module is connected to one end of the switching unit, and the other end of the switching unit is connected to the battery. The communication interface module is used to connect to an external terminal.

[0006] The circuit control chip receives the discharge capacity of the battery detected by the fuel gauge module, controls the opening and closing of the switch unit according to the discharge capacity of the battery, and sends the discharge capacity of the battery to the external terminal.

[0007] As a preferred embodiment of the above technical solution, the main control unit further includes a temperature sampling module connected to the circuit control chip. The temperature sampling module is used to collect ambient temperature data of the battery. The circuit control chip receives the ambient temperature data to adjust the discharge capacity limit of the battery.

[0008] As a preferred embodiment of the above technical solution, the main control unit further includes a storage chip connected to the circuit control chip. The storage chip is used to store the discharge capacity limit and the operation information of the battery sample device. The operation information includes at least one of low-power sleep mode, capacity test, adjustment of discharge capacity limit, or disconnection of discharge circuit.

[0009] As a preferred embodiment of the above technical solution, the main control unit further includes a clock chip connected to the circuit control chip. The clock chip is used to provide time information to the circuit control chip, and the clock chip cooperates with the fuel gauge module to detect the discharge capacity of the battery.

[0010] As a preferred embodiment of the above technical solution, the power meter module includes a chip U1, a first interface circuit, a second interface circuit, and a third interface circuit. The first interface circuit, the second interface circuit, and the third interface circuit are all connected to the chip U1. The first interface circuit is connected to the circuit control chip, the second interface circuit is connected to the switching unit, and the third interface circuit is connected to the storage chip.

[0011] As a preferred embodiment of the above technical solution, the memory chip includes chip U3 with model number AT24C04, and the clock chip includes chip U4 with model number DS3231.

[0012] As a preferred embodiment of the above technical solution, the chip U1 is model BQ4050RSM, and the circuit control chip includes chip U2, model HR7P169B.

[0013] As a preferred embodiment of the above technical solution, the discharge capacity of the battery sample device is 80% of the discharge capacity of the battery.

[0014] As a preferred embodiment of the above technical solution, when the discharge capacity of the battery sample device reaches the discharge capacity limit of the battery, the circuit control chip cuts off the discharge circuit where the switching unit is located.

[0015] This invention provides a battery sample device with re-discharge capacity. It comprises a battery, a main control unit, and a switching unit. The main control unit includes a fuel gauge module and a circuit control chip. The circuit control chip receives the battery's discharge capacity detected by the fuel gauge module, controls the opening and closing of the switching unit based on the discharge capacity, and sends the battery's discharge capacity to an external terminal. Using the fuel gauge module, the battery's discharge capacity can be accurately recorded and reproduced to obtain the discharge capacity test results of the battery sample device. It features a simple circuit structure and convenient operation, and to a certain extent improves the working stability of the battery sample device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A structural block diagram of the battery sample device with re-discharge capacity provided by this utility model;

[0018] Figure 2 Working principle diagram of the battery sample device provided by this utility model;

[0019] Figure 3 Circuit diagram of the power meter module provided by this utility model;

[0020] Figure 4 Circuit diagram of the circuit control chip provided by this utility model;

[0021] Figure 5 Circuit diagram of the memory chip provided by this utility model;

[0022] Figure 6 The circuit diagram of the clock chip provided by this utility model.

[0023] The symbols for the main components are explained below:

[0024] 100-Battery; 200-Main control unit; 210-Fuel meter module; 220-Circuit control chip; 221-Control interface module; 222-Communication interface module; 223-Temperature sampling module; 224-Storage chip; 225-Clock chip; 300-Switch unit. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] See Figure 1 and Figure 2 This utility model provides a battery sample device with re-discharge capacity. The battery sample device includes a battery 100, a main control unit 200, and a switching unit 300. The main control unit 200 includes a fuel gauge module 210 and a circuit control chip 220 connected to the fuel gauge module 210. The battery 100 is connected to the fuel gauge module 210. The circuit control chip 220 includes a control interface module 221 and a communication interface module 222. The control interface module 221 is connected to one end of the switching unit 300, and the other end of the switching unit 300 is connected to the battery 100. The communication interface module 222 is used to connect to an external terminal.

[0027] The circuit control chip 220 receives the discharge capacity of the battery detected by the fuel gauge module 210, controls the opening and closing of the switch unit 300 according to the discharge capacity of the battery, and sends the discharge capacity of the battery 100 to the external terminal.

[0028] In this embodiment, see Figure 3 , Figure 4 , Figure 5 and Figure 6The main control unit 200 further includes a temperature sampling module 223 connected to the circuit control chip 220. The temperature sampling module 223 is used to collect ambient temperature data of the battery 100. The circuit control chip 220 receives the ambient temperature data to adjust the discharge capacity limit of the battery 100. The main control unit 200 also includes a storage chip 224 connected to the circuit control chip 220. The storage chip 224 is used to store the discharge capacity limit and the operation information of the battery sample device. The operation information includes at least one of low-power sleep mode, capacity test, adjusting the discharge capacity limit, or cutting off the discharge circuit. The main control unit 200 also includes a clock chip 225 connected to the circuit control chip 220. The clock chip 225 is used to provide time information to the circuit control chip 220. The clock chip 225 cooperates with the fuel gauge module 210 to detect the discharge capacity of the battery 100. The power meter module 210 includes a chip U1, a first interface circuit, a second interface circuit, and a third interface circuit. The first interface circuit, the second interface circuit, and the third interface circuit are all connected to the chip U1. The first interface circuit is connected to the circuit control chip 220, the second interface circuit is connected to the switch unit 300, and the third interface circuit is connected to the storage chip 224.

[0029] It should be noted that the storage chip 224 includes chip U3 of model AT24C04, the clock chip 225 includes chip U4 of model DS3231, the chip U1 is of model BQ4050RSM, and the circuit control chip 220 includes chip U2 of model HR7P169B. The discharge capacity of the battery sample device is 80% of the discharge capacity of the battery 100. When the discharge capacity of the battery sample device reaches the discharge capacity limit of the battery 100, the circuit control chip 220 cuts off the discharge circuit of the switching unit 300. The output terminal of the battery sample device is provided with a sample positive electrode and a sample negative electrode, which can be connected to a load. When the lithium battery discharges, the battery voltage decreases as time increases.

[0030] like Figure 2As shown, battery 100 is a lithium battery, circuit control chip 220 is an MCU, control interface module 221 is a GPIO interface, and communication interface module 222 can be a host computer communication interface such as RS232 or RS485. Switching unit 300 mainly includes a charging switch and a discharging switch corresponding to the MOS chip. Battery 100 is connected in parallel with a precision resistor R to fuel gauge module 210, which can detect the voltage or current of the lithium battery. Storage chip 224, designated EEPROM, can store control commands, operation information, or preset discharge capacity. The MCU is also connected to a programmer for program programming. Since discharge capacity is temperature-sensitive, temperature acquisition module 223 can collect ambient temperature data and transmit it to circuit control chip 220. Circuit control chip 220 can weight and modify the discharge capacity limit based on the collected ambient temperature data, thereby reflecting improper ambient temperature control results in the discharge capacity test results.

[0031] Among them, such as Figure 3As shown, the power meter module 210 mainly includes a chip U1, a circuit connecting the positive terminal of the battery, a circuit connecting the negative terminal of the battery, a first interface circuit, a second interface circuit, and a third interface circuit. The circuit connecting the positive terminal of the battery includes a diode D1, capacitors C1, C5, and C6. D1 and C6 are connected in parallel to pin 32 of chip U1. C5 is connected to pins 1 and 33 of chip U1. R1 and one end of C1 are connected in parallel to pin 2 of chip U1. The other end of C1 is connected to pins 7 and 9 of chip U1. The circuit connecting the negative terminal of the battery includes capacitors C8, C9, and C10, resistors R13, RS1, and RS2, and a capacitor R14. C8, C9, and C10 are connected in parallel to pins 6 and 8 of chip U1. The circuit consists of resistors R13 and R14, with RS1 and RS2 connected in parallel to the other ends of R13 and R14. One end of RS1 is connected to the negative terminal of the battery, and the other end is connected to the negative terminal of the test port (black clip). The first interface circuit includes resistors R43, R44, and RT1. RT1 is connected to pin 10 of chip U1. One end of R43 is connected to R44, and the other end of R43 is connected to pin 16 of chip U1. The second interface circuit includes resistors R6, R7, R8, R9, R10, R11, and R12, power transistor groups (Q1, Q3, Q5, Q7), power transistor groups (Q2, Q4, Q6, Q8), and capacitor C. 7. Capacitors C11 and C12, power transistor Q9, power transistor group (Q1, Q3, Q5, Q7), C11, and R6 are connected in parallel to the positive terminal of the battery. The power transistor group (Q1, Q3, Q5, Q7), one end of R6 and R7, and the other end of R7 are connected to pin 31 of chip U1. The power transistor group (Q1, Q3, Q5, Q7) and the power transistor group (Q2, Q4, Q6, Q8) are connected to one end of R10. The other end of R10 is connected to C7 and pin 26 of chip U1. The power transistor group (Q2, Q4, Q6, Q8) and C12 are connected in parallel to the source of R8 and Q9, and the positive terminal of the test port (red clip). One end of R9 is connected to the power transistor group (Q2, Q4, Q6, Q8), R8... The drain of Q9 is connected, R11 is connected to the gate of Q9, and the other end of R9 is connected to pin 28 (DSG) of chip U1. One end of R12 is connected to the positive terminal of the test port, and the other end of R12 is connected to pin 27 of chip U1. The third interface circuit includes resistors R15, R16, R17, R18, R19, and R20, diodes Z1 and Z2. R15 is connected to R17 and R18, R17 is connected to pin 19 of chip U1, R16 is connected to R19 and R20, R19 is connected to pin 18 of chip U1, R15 is connected to R18, Z2 is connected to R17 and R18, Z1 is connected to R19 and R20, and Z1 is connected to Z2.

[0032] Among them, such as Figure 4As shown, the circuit control chip 220 mainly includes chip U2, capacitor C15, and resistor R21. C15 is connected to pins 20 and 21 of chip U2, R21 is connected to pin 15 of chip U2, pins 2 (SCL) and 3 (SDA) of chip U2 are connected to the third interface circuit of chip U1, and pin 11 (WKUP_CTL) of chip U2 is connected to the second interface circuit of chip U1. Figure 5 As shown, the storage chip 224 mainly includes chip U3, capacitor C16, resistors R22, R23, R24, R25, R26, R27, diode Z3, and diode Z4. C16 is connected to pin 8 of chip U3, R22 is connected to pin 6 of chip U3, R23 is connected to pin 5 of chip U3, R26 is connected to R22, R24, and Z3, and R27 is connected to R23, R25, and Z4. R24 of chip U3 is connected to pin 7 of chip U2, and R25 of chip U3 is connected to pin 5 of chip U2. Figure 6 As shown, the clock chip 225 mainly includes chip U4, capacitor C17, resistors R35, R36, R37, R45 and R46. C17 is connected to pin 2 of chip U4, R37 is connected to pins 9 to 14 of chip U4, R45 is connected to R35 and R46, R46 is connected to R36, R35 is connected to pin 16 of chip U4, R36 is connected to pin 15 of chip U4, R35 is connected to pin 17 of chip U2, and R36 is connected to pin 16 of chip U2.

[0033] Specifically, the positive terminal of battery 100 is connected to the positive terminal of the connected battery, and the negative terminal of battery 100 is connected to the negative terminal of the connected battery. U1 is connected through the third interface circuit ( Figure 3 3) Connect pins 2 and 3 (SCL, SDA) of U2 to provide battery current information to the MCU; U3 is connected to pins 5 and 7 (SDA1, SCL1) of U2 via the first interface circuit; U4 is connected to pins 8 and 9 (SCL, SDA) of U1 via the third interface circuit to provide time information to the MCU. When the device is connected... Figure 3 When the test port discharges, U1 feeds back the current value to U2. At this time, the clock chip U4 provides time information. The MCU calculates the capacity by multiplying the time by the current. The MCU can preset a capacity threshold. When the preset capacity threshold is reached, pin 10 of the MCU (PRES_MCU0) will output a high level, connecting to the first interface circuit of the fuel gauge module. Figure 3 In part 1), at this time, the second interface circuit of U1 ( Figure 3In step 2), a low-level signal will be sent to turn off the discharge MOS and cut off the output, ensuring that the discharge time capacity is consistent with the preset value. After a 1-minute delay, pin 10 (PRES_MCU0) of U2 will go low, the MOS transistor will turn back on and return to its initial state. The MCU capacity threshold can be changed in different ways through the MCU program.

[0034] Specifically, the circuit control chip 220 tests the ambient temperature of the laboratory through the temperature acquisition module 223 in the circuit. Based on the ambient temperature and the pre-written algorithm, it actively adjusts the set discharge capacity (discharge capacity limit), thereby effectively supervising the laboratory's failure to properly control the test environment temperature. When the fuel gauge module 210 detects no current flowing through the circuit, the circuit control chip 220 puts the battery sample device into sleep mode. To reduce the impact of system self-discharge, the battery sample device can enter a low-power sleep mode when there is no current flowing through the circuit. This way, after each full charge, the battery sample device can be left idle for a period of time before starting capacity testing. The discharge capacity of the battery sample device is 80% of the battery capacity (battery discharge capacity). Because the discharge capacity of the built-in battery 100 will decrease with cycle use, and the circuit components of the battery sample device may also have some power loss, the discharge capacity should be set lower than that of the built-in battery with a certain margin. For example, if the built-in battery uses a 10000mAh battery cell (discharge capacity is higher than 90% after 300 cycles), and the discharge capacity is set to 8000mAh, the same discharge capacity can be reproduced hundreds of times within its cycle life.

[0035] Specifically, the main control unit 200 can read and store the operation information of the battery sample device. The discharge capacity can be set and modified programmatically. The discharge capacity of the battery sample device can be written to and modified by the circuit control chip 220 through the serial port (communication interface module). When issuing control commands, it can also read the operation information stored in the storage chip 224. The battery sample device is vacuum-packed, resembling a traditional battery sample. This allows the entire on-chip system to be designed to be compact, leaving only the positive and negative terminals of the battery standard sample exposed as electrode plates. The remaining structure is packaged using a special aluminum-plastic film for battery cells after vacuum sealing. The appearance of the sample can be consistent with the finished battery product produced by the enterprise.

[0036] It should be understood that by setting up a battery 100, a main control unit 200, and a switch unit 300, the main control unit 200 includes a fuel gauge module 210 and a circuit control chip 220. The circuit control chip 220 receives the discharge capacity of the battery 100 detected by the fuel gauge module 210. The circuit control chip 220 controls the opening and closing of the switch unit 300 according to the discharge capacity of the battery 100 and sends the discharge capacity of the battery 100 to an external terminal. The fuel gauge module 210 can accurately record the discharge capacity of the battery 100 and reproduce the discharge capacity to obtain the discharge capacity test results of the battery sample device. It has the characteristics of simple circuit structure and convenient operation, and improves the working stability of the battery sample device to a certain extent.

[0037] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A battery sample device with re-discharge capacity, characterized in that, The battery sample device includes a battery, a main control unit, and a switch unit. The main control unit includes a fuel gauge module and a circuit control chip connected to the fuel gauge module. The battery is connected to the fuel gauge module. The circuit control chip includes a control interface module and a communication interface module. The control interface module is connected to one end of the switch unit, and the other end of the switch unit is connected to the battery. The communication interface module is used to connect to an external terminal. The circuit control chip receives the discharge capacity of the battery detected by the fuel gauge module, controls the opening and closing of the switch unit according to the discharge capacity of the battery, and sends the discharge capacity of the battery to the external terminal.

2. The battery sample apparatus with re-discharge capacity according to claim 1, characterized in that, The main control unit also includes a temperature sampling module connected to the circuit control chip. The temperature sampling module is used to collect ambient temperature data of the battery. The circuit control chip receives the ambient temperature data to adjust the discharge capacity limit of the battery.

3. The battery sample apparatus with re-discharge capacity according to claim 2, characterized in that, The main control unit also includes a storage chip connected to the circuit control chip. The storage chip is used to store the discharge capacity limit and the operation information of the battery sample device. The operation information includes at least one of low-power sleep mode, capacity test, adjustment of discharge capacity limit, or disconnection of discharge circuit.

4. The battery sample apparatus with re-discharge capacity according to claim 3, characterized in that, The main control unit also includes a clock chip connected to the circuit control chip. The clock chip is used to provide time information to the circuit control chip. The clock chip works with the fuel gauge module to detect the discharge capacity of the battery.

5. The battery sample apparatus with re-discharge capacity according to claim 4, characterized in that, The power meter module includes a chip U1, a first interface circuit, a second interface circuit, and a third interface circuit. The first interface circuit, the second interface circuit, and the third interface circuit are all connected to the chip U1. The first interface circuit is connected to the circuit control chip, the second interface circuit is connected to the switching unit, and the third interface circuit is connected to the storage chip.

6. The battery sample apparatus with re-discharge capacity according to claim 4, characterized in that, The memory chip includes chip U3, model number AT24C04, and the clock chip includes chip U4, model number DS3231.

7. The battery sample apparatus with re-discharge capacity according to claim 5, characterized in that, The chip U1 is model BQ4050RSM, and the circuit control chip includes chip U2, model HR7P169B.

8. The battery sample apparatus with re-discharge capacity according to claim 1, characterized in that, The discharge capacity of the battery sample device is 80% of the discharge capacity of the battery.

9. The battery sample apparatus with re-discharge capacity according to claim 8, characterized in that, When the discharge capacity of the battery sample device reaches the discharge capacity limit of the battery, the circuit control chip cuts off the discharge circuit where the switching unit is located.

Images