A lithium battery cell analog controller

Abstract

The utility model relates to lithium cell test and simulation technical field, concretely is a kind of lithium cell core simulation controller, include: power module, single voltage simulation module, temperature simulation module, current simulation module, display module, control module, control module is electrically connected with power module, single voltage simulation module, temperature simulation module, current simulation module and display module respectively, for coordinating each module work, and when single voltage simulation module output voltage drops rapidly, trigger power disconnect instruction. The utility model is designed with multiple groups of high-voltage side power supply and independent temperature simulation unit, can expand simulation string number or temperature monitoring point according to test demand, and the scope of application is wide.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing and simulation technology, specifically a lithium battery cell simulation controller. Background Technology

[0002] In the research, development, production, and testing of lithium battery management systems (BMS) and lithium battery application equipment, it is necessary to test the performance of the equipment under different lithium battery operating conditions. In existing technologies, testing typically relies on actual lithium battery packs, but this presents the following problems: Firstly, the voltage and temperature of a real lithium battery cell are difficult to control precisely, making it impossible to simulate extreme operating conditions (such as sudden voltage drops or localized temperature anomalies). Secondly, repeated charging and discharging of real battery cells can easily cause losses, increasing testing costs; Third, the lack of real-time monitoring and anomaly protection mechanisms for battery cell parameters may lead to damage to testing equipment.

[0003] To address the aforementioned problems, we propose a lithium battery cell simulation controller. Utility Model Content

[0004] The purpose of this invention is to provide a lithium battery cell simulation controller to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A lithium battery cell simulation controller, comprising: A power module for providing a stable operating voltage, the power module is connected to an external 24V power supply and contains at least 16 B1212S model isolated power supplies; A single-cell voltage simulation module, electrically connected to the power module, is used to simulate the single-cell voltage output of a 16-cell lithium battery. The single-cell voltage simulation module includes a microcontroller, a potentiometer, and a capacitor filter circuit. The microcontroller outputs a 10K PWM signal, the potentiometer adjusts the duty cycle of the PWM signal, and the capacitor filter circuit filters the PWM signal to output a 0-4.5V analog voltage. The temperature simulation module, electrically connected to the power module, is used to simulate the temperature signal of a lithium battery. The current simulation module, electrically connected to the power supply module, is used to simulate Hall current sensor signals; The display module is electrically connected to the individual cell voltage simulation module and is used to display the voltage of each individual cell in real time. The control module is electrically connected to the power supply module, the individual voltage simulation module, the temperature simulation module, the current simulation module, and the display module, respectively. It is used to coordinate the operation of each module and triggers a power disconnect command when the output voltage of the individual voltage simulation module drops rapidly.

[0006] Preferably, the power module includes: The power conversion chip is a B1212S type chip, which has GND pin, VIN pin, +VO pin and -VO pin; The first capacitor is connected between the VIN pin and ground (GND). The power conversion chip has its GND pin connected to ground (GND), its -VO pin connected to the high-voltage side ground, and its +VO pin outputting the high-voltage side positive power supply.

[0007] Preferably, the power module further includes: The system comprises multiple power conversion chips and corresponding first capacitors. The high-voltage positive power supply output from the +VO pin of each power conversion chip is configured as 12V_HV_1, 12V_HV_2, 12V_HV_3, 12V_HV_4, 12V_HV_13, 12V_HV_14, 12V_HV_15, and 12V_HV_16, respectively. The high-voltage ground connected to the -VO pin of each power conversion chip is configured as GND_HV_1, GND_HV_2, GND_HV_3, GND_HV_4, GND_HV_13, GND_HV_14, GND_HV_15, and GND_HV_16, respectively.

[0008] Preferably, the display module includes: The four-digit LED display unit has segment pins A, B, C, D, E, F, G, DP and common terminals COM1, COM2, COM3, COM4; Four transistor switching circuits are provided, each transistor switching circuit being connected to a common terminal. Each transistor switching circuit includes a PNP transistor, a first current-limiting resistor, and a collector pull-up resistor. One end of the first current-limiting resistor is connected to an external control terminal, and the other end is connected to the base of the PNP transistor. One end of the collector pull-up resistor is connected to a 5V power supply terminal, and the other end is connected to the collector of the PNP transistor. The emitter of the PNP transistor is grounded. Eight segment resistors, one end of each segment resistor is connected to a segment pin of the four-digit LED display unit, and the other end is connected to an external segment control signal terminal; The PNP transistor receives a control signal through the first current-limiting resistor to control the connection and disconnection between the common terminal of the four-digit LED display unit and ground, and works in conjunction with the signal from the external segment control signal terminal to drive the LED display.

[0009] Preferably, the external segment control signal terminals include terminals A_2, B_2, C_2, D_2, E_2, F_2, G_2, and DP_2.

[0010] Preferably, the single-unit voltage simulation module includes: Resistor R636, the first end of which is used to connect the input signal; A capacitor bank, comprising a first capacitor C97, a second capacitor C98, a third capacitor C94, and a fourth capacitor C95, wherein the first capacitor C97, the second capacitor C98, the third capacitor C94, and the fourth capacitor C95 are connected in parallel; the second terminal of the resistor R636 is connected to the first common terminal of the capacitor bank, and the second common terminal of the capacitor bank is connected to the reference ground GND_HV_3.

[0011] Preferably, the single-unit voltage simulation module further includes a BAT3 identifier terminal, which is connected to the second terminal of resistor R636.

[0012] Preferably, the temperature simulation module includes: At least one potentiometer unit; each potentiometer unit includes a potentiometer, a first output terminal, and a second output terminal; a first end of the potentiometer is connected to the first output terminal, a second end of the potentiometer is connected to the second output terminal, and the second output terminal is a ground terminal.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention uses PWM signal adjustment and capacitor filtering to simulate a single-unit voltage range of 0-4.5V, a current signal with precise 0-5V, and a temperature signal with 0-100KΩ resistance adjustment, thus meeting the parameter accuracy requirements under different testing scenarios. This utility model integrates 16 individual voltage, multi-position temperature, and positive and negative current simulation functions, and also has real-time display and abnormal protection. It does not require additional equipment and simplifies the testing process. This invention uses a B1212S isolated power supply to avoid interference between modules; it automatically cuts off power when the voltage is abnormal to protect the test equipment; it does not rely on real battery cells, reducing battery cell loss and lowering test costs. This utility model features a design with multiple high-voltage side power supplies and independent temperature simulation units, which can expand the number of simulation series or temperature monitoring points according to testing needs, making it widely applicable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the power module circuit of this utility model; Figure 2 This is a schematic diagram of the display module circuit of this utility model; Figure 3 This is a schematic diagram of the single-unit voltage simulation module circuit of this utility model; Figure 4This is a schematic diagram of the temperature simulation module circuit of this utility model; Figure 5 This is a schematic diagram of the current output of the current simulation module of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 A lithium battery cell simulation controller, comprising: The power module is used to provide a stable operating voltage. The power module is connected to an external 24V power supply and contains at least 16 B1212S model isolated power supplies. The input voltage range of the isolated power supplies is 10.8V-13.2V, and the output voltage is 12V, which is converted to 5V by the power conversion circuit to power the subsequent modules. The power module includes: a power conversion chip, which is a B1212S type chip, with a GND pin, a VIN pin, a +VO pin, and a -VO pin; a first capacitor connected between the VIN pin and ground GND; wherein, the GND pin of the power conversion chip is connected to ground GND, the -VO pin is connected to the high-voltage side ground, and the +VO pin outputs the high-voltage side positive power supply.

[0017] The power module includes multiple power conversion chips and corresponding first capacitors. The high-voltage positive power supply output from the +VO pin of each power conversion chip is configured as 12V_HV_1, 12V_HV_2, 12V_HV_3, 12V_HV_4, 12V_HV_13, 12V_HV_14, 12V_HV_15, and 12V_HV_16, respectively. The high-voltage ground connected to the -VO pin of each power conversion chip is configured as GND_HV_1, GND_HV_2, GND_HV_3, GND_HV_4, GND_HV_13, GND_HV_14, GND_HV_15, and GND_HV_16, respectively.

[0018] The single-cell voltage simulation module is electrically connected to the power supply module and is used to simulate the single-cell voltage output of a 16-cell lithium battery. The single-cell voltage simulation module includes a microcontroller, a potentiometer, and a capacitor filter circuit. The microcontroller outputs a 10K PWM signal, the potentiometer adjusts the duty cycle of the PWM signal, and the capacitor filter circuit filters the PWM signal to output a 0-4.5V analog voltage.

[0019] The single-unit voltage simulation module includes: a resistor R636, the first terminal of which is used to connect to the input signal; a capacitor bank, including a first capacitor C97, a second capacitor C98, a third capacitor C94, and a fourth capacitor C95, which are connected in parallel; the second terminal of the resistor R636 is connected to the first common terminal of the capacitor bank, and the second common terminal of the capacitor bank is connected to the reference ground GND_HV_3; wherein, the first capacitor C97 has a capacitance of 47μF and a withstand voltage of 35V; the second capacitor C98, the third capacitor C94, and the fourth capacitor C95 each have a capacitance of 100nF, a withstand voltage of 50V, and a tolerance of 10%; and also includes a BAT3 identifier terminal, which is connected to the second terminal of the resistor R636.

[0020] Resistor R636 is used to transmit the input signal to the first common terminal of the capacitor bank without voltage loss.

[0021] A capacitor bank is formed by connecting capacitors of different capacitance and voltage ratings in parallel to filter or simulate the voltage signal of a single cell.

[0022] The temperature simulation module is electrically connected to the power module and is used to simulate the temperature signal of the lithium battery. The temperature simulation module uses 6 sliding rheostats, and the resistance value of the sliding rheostats can be adjusted from 0 to 100KΩ to simulate temperature changes with resistance signals.

[0023] A temperature simulation module includes: at least one potentiometer unit; each potentiometer unit includes a potentiometer, a first output terminal, and a second output terminal; a first end of the potentiometer is connected to the first output terminal, and a second end of the potentiometer is connected to the second output terminal; by adjusting the position of the sliding end of the potentiometer to change the equivalent resistance between the first output terminal and the second output terminal, an electrical signal corresponding to the simulated temperature is output.

[0024] The second output terminal is the grounding terminal.

[0025] The temperature simulation module includes multiple potentiometer units; the potentiometers of the multiple potentiometer units are respectively a first potentiometer, a second potentiometer, ...; the first potentiometer corresponds to the first output terminal and the second output terminal (TEMP1+, TEMP1-) of the first group, and the second potentiometer corresponds to the second output terminal and the second output terminal (TEMP2+, TEMP2-) of the second group.

[0026] The sliding contact adjustments of the potentiometers in multiple potentiometer units are independent of each other, so that each potentiometer unit can output electrical signals corresponding to different simulated temperatures.

[0027] The current simulation module is electrically connected to the power supply module and is used to simulate the Hall current sensor signal. The current simulation module is controlled by a microcontroller to output a 0-5V voltage signal, and 2.5V voltage corresponds to 0A current. Different voltage values ​​correspond to different output currents.

[0028] The display module is electrically connected to the individual cell voltage simulation module and is used to display the voltage of each cell in real time. The display module uses a 0.36-inch common anode four-digit LED display and displays the voltage value through scanning at the COM1-COM4 common terminals.

[0029] The display module includes: a four-digit LED display unit with segment pins A, B, C, D, E, F, G, DP and common terminals COM1, COM2, COM3, COM4; four transistor switching circuits, each connected to a common terminal, each transistor switching circuit including a PNP transistor, a first current-limiting resistor and a collector pull-up resistor, one end of the first current-limiting resistor connected to an external control terminal and the other end connected to the base of the PNP transistor, one end of the collector pull-up resistor connected to a 5V power supply terminal and the other end connected to the collector of the PNP transistor, the emitter of the PNP transistor grounded; and eight segment resistors, one end of each segment resistor connected to a segment pin of the four-digit LED display unit and the other end connected to an external segment control signal terminal; wherein, the PNP transistor receives the control signal through the first current-limiting resistor to control the connection and disconnection between the corresponding common terminal of the four-digit LED display unit and ground, and cooperates with the signal of the external segment control signal terminal to realize the LED display driving.

[0030] The PNP type transistor is the SS8550 type transistor.

[0031] The external segment control signal terminals include terminals A_2, B_2, C_2, D_2, E_2, F_2, G_2, and DP_2.

[0032] The control module is electrically connected to the power supply module, the individual voltage simulation module, the temperature simulation module, the current simulation module, and the display module, respectively. It is used to coordinate the operation of each module and triggers a power disconnect command when the output voltage of the individual voltage simulation module drops rapidly.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery cell simulation controller, characterized in that, include: A power module for providing a stable operating voltage, the power module is connected to an external 24V power supply and contains at least 16 B1212S model isolated power supplies; A single-cell voltage simulation module, electrically connected to the power module, is used to simulate the single-cell voltage output of a 16-cell lithium battery. The single-cell voltage simulation module includes a microcontroller, a potentiometer, and a capacitor filter circuit. The microcontroller outputs a 10K PWM signal, the potentiometer adjusts the duty cycle of the PWM signal, and the capacitor filter circuit filters the PWM signal to output a 0-4.5V analog voltage. The temperature simulation module, electrically connected to the power module, is used to simulate the temperature signal of a lithium battery. The current simulation module, electrically connected to the power supply module, is used to simulate Hall current sensor signals; The display module is electrically connected to the individual cell voltage simulation module and is used to display the voltage of each individual cell in real time. The control module is electrically connected to the power supply module, the individual voltage simulation module, the temperature simulation module, the current simulation module, and the display module, respectively. It is used to coordinate the operation of each module and triggers a power disconnect command when the output voltage of the individual voltage simulation module drops rapidly.

2. A lithium battery cell simulation controller according to claim 1, characterized in that, The power module includes: The power conversion chip is a B1212S type chip, which has GND pin, VIN pin, +VO pin and -VO pin; The first capacitor is connected between the VIN pin and ground (GND). The power conversion chip has its GND pin connected to ground (GND), its -VO pin connected to the high-voltage side ground, and its +VO pin outputting the high-voltage side positive power supply.

3. A lithium battery cell simulation controller according to claim 2, characterized in that, The power module further includes: The system comprises multiple power conversion chips and corresponding first capacitors. The high-voltage positive power supply output from the +VO pin of each power conversion chip is configured as 12V_HV_1, 12V_HV_2, 12V_HV_3, 12V_HV_4, 12V_HV_13, 12V_HV_14, 12V_HV_15, and 12V_HV_16, respectively. The high-voltage ground connected to the -VO pin of each power conversion chip is configured as GND_HV_1, GND_HV_2, GND_HV_3, GND_HV_4, GND_HV_13, GND_HV_14, GND_HV_15, and GND_HV_16, respectively.

4. A lithium battery cell simulation controller according to claim 1, characterized in that, The display module includes: The four-digit LED display unit has segment pins A, B, C, D, E, F, G, DP and common terminals COM1, COM2, COM3, COM4; Four transistor switching circuits are provided, each transistor switching circuit being connected to a common terminal. Each transistor switching circuit includes a PNP transistor, a first current-limiting resistor, and a collector pull-up resistor. One end of the first current-limiting resistor is connected to an external control terminal, and the other end is connected to the base of the PNP transistor. One end of the collector pull-up resistor is connected to a 5V power supply terminal, and the other end is connected to the collector of the PNP transistor. The emitter of the PNP transistor is grounded. Eight segment resistors, one end of each segment resistor is connected to a segment pin of the four-digit LED display unit, and the other end is connected to an external segment control signal terminal; The PNP transistor receives a control signal through the first current-limiting resistor to control the connection and disconnection between the common terminal of the four-digit LED display unit and ground, and works in conjunction with the signal from the external segment control signal terminal to drive the LED display.

5. A lithium battery cell simulation controller according to claim 4, characterized in that, The external segment control signal terminals include terminals A_2, B_2, C_2, D_2, E_2, F_2, G_2, and DP_2.

6. A lithium battery cell simulation controller according to claim 1, characterized in that, The single-unit voltage simulation module includes: Resistor R636, the first end of which is used to connect the input signal; A capacitor bank, comprising a first capacitor C97, a second capacitor C98, a third capacitor C94, and a fourth capacitor C95, wherein the first capacitor C97, the second capacitor C98, the third capacitor C94, and the fourth capacitor C95 are connected in parallel; the second terminal of the resistor R636 is connected to the first common terminal of the capacitor bank, and the second common terminal of the capacitor bank is connected to the reference ground GND_HV_3.

7. A lithium battery cell simulation controller according to claim 6, characterized in that, The single-unit voltage simulation module also includes a BAT3 identifier terminal, which is connected to the second terminal of resistor R636.

8. A lithium battery cell simulation controller according to claim 1, characterized in that, The temperature simulation module includes: At least one potentiometer unit; each potentiometer unit includes a potentiometer, a first output terminal, and a second output terminal; a first end of the potentiometer is connected to the first output terminal, a second end of the potentiometer is connected to the second output terminal, and the second output terminal is a ground terminal.

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