Device for simulating operation of battery cell

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a device for simulating battery cell operation, which comprises a main control module, a voltage acquisition module, a resistance voltage division module and a voltage reading module, the voltage acquisition module is respectively and electrically connected with the main control module and the resistance voltage division module, the resistance voltage division module is provided with a plurality of adjustable voltage division units which are connected in series, and the voltage reading module is connected with the main control module. The voltage reading module is electrically connected to the main control module. According to the utility model, a plurality of cells do not need to be accessed when the BMS is tested, the operation safety is high, and the BMS can be tested more safely.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a device for simulating the operation of a battery cell. Background Art

[0002] With the rapid development of new energy and energy storage technologies, the importance of battery management systems (BMS) in the energy storage field is increasing. They can effectively detect the operational safety of batteries. However, to ensure the test accuracy of the BMS, it is necessary to conduct comprehensive tests on the connected battery cells. However, when multiple battery cells are connected during the BMS test, the low connection stability of the multiple battery cells makes it impossible to conduct efficient and repeated debugging during the test, resulting in low adjustment stability during the test process, and easily causing safety risks such as short circuits or electric shocks. Therefore, a new technical solution is urgently needed to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies of the existing technology and provide a device for simulating the operation of a battery cell, which has high operating safety and can test the BMS more safely.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A device for simulating the operation of a battery cell includes a main control module, a voltage acquisition module, a resistance voltage divider module, and a voltage reading module. The voltage acquisition module is electrically connected to the main control module and the resistance voltage divider module, respectively. The main control module is electrically connected to the resistance voltage divider module. The resistance voltage divider module has multiple adjustable voltage divider units connected in series. The voltage reading module is electrically connected to the main control module.

[0006] As an improvement of the device for simulating the operation of a battery cell of the present invention, the main control module is electrically connected to the resistance voltage divider module via a step-up and step-down conversion module.

[0007] As an improvement to the device for simulating the operation of a battery cell of the present invention, the resistance voltage divider module is electrically connected to the detection module, and the detection module is electrically connected to at least one of the adjustable voltage divider units.

[0008] As an improvement to the device for simulating the operation of a battery cell of the present invention, the main control module is electrically connected to the step-up and step-down conversion module via a first communication module.

[0009] As an improvement to the device for simulating the operation of a battery cell of the present invention, the voltage reading module is electrically connected to the main control module via a second communication module.

[0010] As an improvement of the device for simulating the operation of a battery cell of the present invention, the main control module is electrically connected to the input regulation module, and the input regulation module is electrically connected to the step-up and step-down conversion module through the main control module.

[0011] As an improvement to the device for simulating the operation of a battery cell of the present invention, each of the adjustable voltage dividing units has at least two potentiometers connected in parallel.

[0012] As an improvement to the device for simulating the operation of a battery cell of the present invention, the voltages output by the adjustable voltage-dividing units are equal or unequal.

[0013] As an improvement to the device for simulating the operation of a battery cell of the present invention, the main control module is electrically connected to a DC-DC conversion module.

[0014] As an improvement of the device for simulating the operation of a battery cell of the present invention, the step-up and step-down conversion module has a BUCK-BOOST circuit, and the main control module is electrically connected to the resistance voltage divider module through the BUCK-BOOST circuit.

[0015] The beneficial effects of the present invention are: the device of the present invention includes a main control module, a voltage acquisition module, a resistance voltage divider module and a voltage reading module, the main control module is used to supply power to the resistance voltage divider module and receive electrical signals from the voltage acquisition module, the voltage acquisition module is electrically connected to the main control module and the resistance voltage divider module respectively, the voltage acquisition module can acquire the output voltage value of the resistance voltage divider module, the main control module is electrically connected to the resistance voltage divider module, the resistance voltage divider module has multiple adjustable voltage divider units connected in series, the voltage reading module is electrically connected to the main control module, the voltage reading module can display the output voltage value of the resistance voltage divider module, when the device is connected to the BMS for testing, one or more adjustable voltage divider units can be connected to the BMS, so that relevant tests of the BMS can be effectively performed without connecting to multiple battery cells, thereby meeting the safety test of the BMS and effectively improving the detection efficiency of the BMS test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the connection of each module of the device of the present invention.

[0017] Figure 2 This is a schematic diagram of the resistor voltage divider circuit of the present invention.

[0018] Figure 3 This is the operating principle diagram of the device of the utility model.

[0019] Among them: 1. Main control module; 2. Voltage acquisition module; 3. Resistor voltage divider module; 4. Voltage reading module; 5. Detection module; 6. Boost and buck conversion module; 7. Input control module. DETAILED DESCRIPTION

[0020] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in name as a way to distinguish components, but rather use differences in the functions of the components as the criteria for distinction. For example, the term "including" mentioned throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0021] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0022] The following is combined with Figures 1 to 3 The present invention is further described in detail with reference to the following specific embodiments, but is not intended to limit the present invention.

[0023] Example 1

[0024] A device that simulates the operation of a battery cell, see Figures 1 to 3 , including a main control module 1, a voltage acquisition module 2, a resistance voltage divider module 3 and a voltage reading module 4. The main control module 1 is an MCU processor, the voltage acquisition module 2 is an AFE chip, the voltage acquisition module 2 is electrically connected to the main control module 1 and the resistance voltage divider module 3 respectively, the main control module 1 is electrically connected to the resistance voltage divider module 3, the resistance voltage divider module 3 has multiple adjustable voltage divider units connected in series, the voltage reading module 4 is electrically connected to the main control module 1, and the voltage reading module 4 can have a digital display unit composed of a digital display circuit.

[0025] Preferably, the resistance voltage divider module 3 is electrically connected to the detection module 5, the detection module 5 is electrically connected to at least one adjustable voltage divider unit, the detection module 5 can be connected in parallel with one or more adjustable voltage divider units, the detection module 5 can be a detection acquisition transmission line or a data detection collector with an acquisition interface, the detection module 5 is used to adapt the adjustable voltage divider unit to the circuit board of the BMS, so that the adjustable voltage divider unit can act as a battery cell to test the quality of the BMS.

[0026] Preferably, the main control module 1 is electrically connected to the resistor voltage divider module 3 through the boost-buck conversion module 6, the boost-buck conversion module 6 has a BUCK-BOOST circuit, the main control module 1 is electrically connected to the resistor voltage divider module 3 through the BUCK-BOOST circuit, and the BUCK-BOOST circuit is controlled by the MCU processor, which can flexibly adjust the input voltage of the resistor voltage divider module 3.

[0027] Among them, see Figure 3 The BUCK-BOOST circuit has a synchronous 4-switch buck-boost controller model SC8701. The SC8701 control chip is electrically connected to the resistor voltage divider module 3 through the 4-switch synchronous buck-boost DC / DC controller LTC3777. The 4-switch synchronous buck-boost DC / DC controller LTC3777 is used to achieve boost, and the SC8701 is used to control and adjust the voltage of the FB pin in the LTC3777, thereby effectively adjusting the output voltage of the LTC3777.

[0028] Preferably, the main control module 1 is electrically connected to the boost-buck conversion module 6 through a first communication module. The first communication module can be a PWM communication module. The MCU can flexibly control the output voltage of the BUCK-BOOST circuit through the PWM signal, and adjust the total voltage of the analog battery cell in the device up or down as needed.

[0029] Among them, the AFE chip can collect real-time voltage. Specifically, the voltage reading module 4 is electrically connected to the main control module 1 through the second communication module. The second communication module can be a CAN bus communication module or a CAN chip. When this device is used for BMS testing, one or more adjustable voltage divider units are electrically connected to the AFE chip and the BMS circuit board at the same time. The voltage reading module 4, the CAN bus communication module, the MCU and the AFE chip communicate in sequence to obtain the current voltage situation.

[0030] Preferably, the main control module 1 is electrically connected to the input control module 7, which is electrically connected to the step-up / step-down conversion module 6 via the main control module 1. The input control module 7 can be a host computer. By issuing corresponding commands or instructions from the host computer, the output voltage of the buck-boost circuit can be adjusted, thereby achieving the purpose of regulating the total voltage. Furthermore, the voltage reading module 4 can also be directly integrated into the host computer. The host computer can obtain and display the collected real-time voltage value through communication with the MCU via the CAN bus communication module, that is, the real-time voltage can be directly obtained from the host computer.

[0031] Preferably, the resistance voltage divider module 3 is a resistance voltage divider circuit, which can simulate an actual battery cell. In this way, the device does not have a battery cell but has an operating structure that acts as a battery cell. Each adjustable voltage divider unit of the resistance voltage divider module 3 has at least two potentiometers connected in parallel. Since the resistance of each potentiometer is a variable resistor, each variable resistor can be adjusted to the same or different resistance value, and the voltage output by each adjustable voltage divider unit can be equal or unequal.

[0032] Specifically, in a single adjustable voltage divider unit, an adjustable resistor R1 and a 1KΩ resistor R are connected in series and then connected in parallel with an adjustable resistor R2. Under normal circumstances, the adjustable resistor R1 is adjusted to the minimum value of 0Ω, and the adjustable resistor R2 is adjusted to the maximum value of 100KΩ. At this time, the circuit of the resistance voltage divider module 3 is composed of resistors of 1KΩ and 100KΩ connected in parallel and then connected in series. The voltages output by each adjustable voltage divider unit in the resistance voltage divider circuit are equal.

[0033] Among them, when it is necessary to increase the voltage of a specific monomer, the resistance value of R1 is increased and the resistance value of R2 remains unchanged; at this time, the total parallel resistance value will become larger and the monomer voltage will become higher; when it is necessary to decrease the voltage of a specific monomer, the resistance value of R1 is kept at 0Ω and the resistance value of R2 is reduced; at this time, the total parallel resistance value will become smaller and the monomer voltage will become smaller; in addition, when repeatedly adjusting the voltage, the adjusted monomer voltage value can be checked at any time through the host computer.

[0034] Example 2

[0035] Unlike Example 1, the main control module 1 is also electrically connected to a DC-DC conversion module. The MCU processor's supply voltage is generally 5V or 3.3V, and the external voltage sometimes cannot provide exactly 5V or 3.3V. Adding a DC-DC conversion module can adapt to more input voltages and convert the external voltage into a suitable supply voltage for the MCU processor. Furthermore, the input voltage can be either 24V or 12V.

[0036] The other structures of this embodiment are the same as those of embodiment 1 and will not be described again here.

[0037] After the device of the present invention is connected to the BMS circuit board, it can be used as a test system for simulating battery cells. The resistor divider module 3 can simulate the battery cells, so that the test system does not need to use actual battery cells. Moreover, the resistor divider module 3 can adapt to different BMS boards by adapting to different wiring harnesses. The resistor divider module 3 can directly power the test board to simulate the actual battery cells, thereby greatly increasing safety.

[0038] In addition, the device of the present invention can directly read the voltage of the simulated battery cell through the host computer without the need for separate measurement; at the same time, the voltage of the area serving as a single battery cell can be adjusted in real time through the potentiometer of each adjustable voltage divider unit, or the voltage value of the area serving as any battery cell can be adjusted through the potentiometer, and the total voltage of the simulated battery cell can be adjusted through the BUCK-BOOST circuit; different BMS boards can also be adapted by adjusting the potentiometer to zero ohm.

[0039] In this device, each adjustable voltage divider unit is reusable. By adjusting the potentiometer voltage pattern, the voltage of simulated cells with different numbers of cells can be simulated, making the device more adaptable. Furthermore, by zeroing the potentiometer, different string numbers can be output, and individual voltage ratios can be adjusted as needed. The AFE voltage acquisition chip directly reads the actual output value of the current simulated cell, making corresponding BMS testing more efficient.

[0040] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present utility model fall within the scope of protection of the present utility model. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present utility model.

Claims

1. A device for simulating the operation of a battery cell, characterized in that: include: A main control module (1), a voltage acquisition module (2), a resistor voltage divider module (3) and a voltage reading module (4); The voltage acquisition module (2) is electrically connected to the main control module (1) and the resistance voltage dividing module (3) respectively; The main control module (1) is electrically connected to the resistance voltage dividing module (3), and the resistance voltage dividing module (3) has a plurality of adjustable voltage dividing units connected in series; The voltage reading module (4) is electrically connected to the main control module (1).

2. The device for simulating the operation of a battery cell according to claim 1, wherein: The main control module (1) is electrically connected to the resistance voltage dividing module (3) via a step-up / step-down conversion module (6).

3. The device for simulating the operation of a battery cell according to claim 1 or 2, characterized in that: The resistance voltage dividing module (3) is electrically connected to the detection module (5), and the detection module (5) is electrically connected to at least one of the adjustable voltage dividing units.

4. The device for simulating the operation of a battery cell according to claim 2, wherein: The main control module (1) is electrically connected to the step-up and step-down conversion module (6) via a first communication module.

5. The device for simulating the operation of a battery cell according to claim 1 or 2, characterized in that: The voltage reading module (4) is electrically connected to the main control module (1) via a second communication module.

6. The device for simulating the operation of a battery cell according to claim 2, wherein: The main control module (1) is electrically connected to the input control module (7), and the input control module (7) is electrically connected to the step-up / step-down conversion module (6) through the main control module (1).

7. The device for simulating battery cell operation according to claim 1 or 2, characterized in that: Each of the adjustable voltage dividing units has at least two potentiometers connected in parallel.

8. The device for simulating the operation of a battery cell according to claim 7, wherein: The voltages output by the adjustable voltage dividing units are equal or unequal.

9. The device for simulating battery cell operation according to claim 1 or 2, characterized in that: The main control module (1) is electrically connected to the DC-DC conversion module.

10. The device for simulating the operation of a battery cell according to claim 2, wherein: The step-up / step-down conversion module (6) has a BUCK-BOOST circuit, and the main control module (1) is electrically connected to the resistance voltage divider module (3) via the BUCK-BOOST circuit.

Images