CMU testing device

Abstract

The utility model relates to the technical field of battery testing, in particular to a CMU testing device which comprises a battery simulator, a battery acquisition chip and a voltage-stabilized source, the battery simulator is in circuit connection with the battery acquisition chip, and the battery acquisition chip is in circuit connection with the voltage-stabilized source. According to the CMU testing device, after a battery simulator and a battery sampling chip are connected with a multi-channel line, a voltage-stabilized power supply is arranged on the battery sampling chip, and the battery simulator can accurately simulate the voltage and state of each battery unit, so that the battery sampling chip can collect and monitor the voltage of each simulated battery unit in real time; the voltage-stabilized power supply provides stable and clean voltage for the battery sampling chip, the influence of the working current of the battery sampling chip on the chip acquisition precision is eliminated, the voltage sampling precision and the measurement accuracy of the battery sampling chip are improved, and the CMU test efficiency and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, and particularly relates to a CMU testing device. Background Art

[0002] The wiring method of the traditional battery sampling chip is that the positive power supply of the battery sampling chip is connected to the highest string sampling line, and the negative power supply of the battery sampling chip is connected to the reference ground of the first string sampling. When the current battery voltage acquisition unit CMU tests the voltage acquisition function during production offline, the wiring method is also connected in the above manner.

[0003] For example, in a general function testing device based on a battery management system disclosed in Patent Application No. CN202320238011.8, all pins of the BMI unit are connected to the general function testing unit through an aviation plug, the BMU unit is connected to the CMU unit through an SPI line, the CMU unit is connected to the battery simulator through a wire, and the high-drive output pin, low-drive output pin, analog input pin, etc. are assigned to different logic circuits in the general function testing unit. This part of the corresponding connection logic relationship is pre-assigned on the aviation plug, achieving high scalability, that is, if the number of relays in the general function testing unit is insufficient, relay boards can be continuously connected in series for expansion later, without purchasing the entire set of finished HIL benches from the supplier, further greatly reducing the bench purchase cost, and the entire testing system is quickly and simply built, greatly saving the time of project testing. However, the analog signal has signal interference and noise problems, which will affect the test accuracy and reliability; in a DC charging pile simulation device for function testing disclosed in Patent Application No. CN202221475707.4, by setting a main controller, a sub-controller, a pile-end battery pack BMS, a pile-end battery pack CMU, a vehicle-end battery pack BMS, a DC / DC ammeter, an analog AC / DC ammeter upper computer, a programmable DC power supply, a charging interface switch, a T-BOX, a card reader, a touch screen and a CAN bus structure, since the module devices used in this simulation device are all module devices in a real DC charging pile, the simulation effect is good, the reliability of the data obtained by using this simulation device for DC charging pile function testing is high, and this simulation device can also simulate the fault conditions of high-voltage devices and lines in the DC charging pile. Although the simulation device can simulate conventional parameters, it may be difficult to accurately reproduce various complex physical and chemical state changes of the battery unit in actual applications, especially long-term aging, thermal management problems and performance under extreme conditions, there is insufficient reproduction of the fault detection and diagnosis scenarios, and the incomplete accuracy of the sensor analog signal will affect the comprehensive testing of the CMU function.

[0004] Therefore, in the test devices disclosed in the above two utility model patents, for CMU testing, since the monomer voltage is output by the battery simulator, it is affected by the output voltage and current characteristics of battery simulators of different brands, resulting in inconsistent monomer voltage acquisition accuracy. At this time, the working current of the battery acquisition chip will flow through each string of batteries, and the working current of the battery acquisition chip itself fluctuates greatly, resulting in a large impact on the voltage sampling accuracy. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a CMU test device to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above purpose, the present utility model discloses a CMU test device, which includes a battery simulator, a battery acquisition chip and a regulated power supply. The voltage output end of the battery simulator (1) is connected to the voltage sampling input end of the battery acquisition chip (2) through a circuit. The power input end VBAT+ of the battery acquisition chip (2) is connected to the positive pole + of the regulated power supply (3) through a circuit, and the power output end VBAT- of the battery acquisition chip (2) is connected to the negative pole - of the regulated power supply (3) through a circuit;

[0007] Each battery terminal from the B1- end to the B10- end of the battery simulator is synchronously connected to the corresponding voltage sampling input ends of B1-, Cell-1 to Cell-10 of the battery acquisition chip through a connection circuit to achieve the delivery of voltage signals;

[0008] The regulated power supply provides necessary power supply to the power input end VBAT+ and the power output end VBAT- of the battery acquisition chip to ensure the normal operation of the battery acquisition chip and is not affected by the output fluctuation of the battery simulator.

[0009] Optionally, the battery simulator includes a B1- end, a B1 end, a B2 end, a B3 end, a B4 end, a B5 end, a B6 end, a B7 end, a B8 end, a B9 end and a B10 end to simulate a plurality of battery packs. Each port from the B1- end to the B10- end provides the voltage output of the corresponding battery unit, that is, the B1- end is the grounding end, and the B1 end to the B10 end are all the positive connection ends simulating each independent battery unit, used to simulate the voltage state of a real battery.

[0010] Optionally, the battery acquisition chip includes a power input terminal VBAT+, a power output terminal VBAT-, a voltage sampling input terminal B1-, voltage sampling input terminals Cell-1, Cell-2, Cell-3, Cell-4, Cell-5, Cell-6, Cell-7, Cell-8, Cell-9, and Cell-10. Among them, the voltage sampling input terminal B1-, and the voltage sampling input terminals Cell-1 to Cell-10 are all used to receive voltage signals from a battery simulator, and the voltage sampling input terminal B1- is the reference negative terminal or ground wire of the battery acquisition chip, which is used to establish a reference point for voltage measurement, and the voltage sampling input terminals Cell-1 to Cell-10 are the positive voltage sampling input terminals of the battery acquisition chip;

[0011] The battery acquisition chip includes 11 channels numbered from 0 to 10, corresponding to the voltage sampling input terminal B1- and the voltage sampling input terminals Cell-1 to Cell-10 from 0 to 10 respectively, for connecting each channel to the B1- to B10- terminals of the battery simulator correspondingly to acquire the battery voltage value of the corresponding cell, and the acquired battery voltage value data is used to simulate the actual single-cell battery voltage.

[0012] Optionally, the regulated power supply includes a positive electrode + and a negative electrode -, and the power input terminal VBAT+ and the power output terminal VBAT- correspond to the positive electrode + and the negative electrode - of the regulated power supply respectively, for outputting a stable power voltage to the battery acquisition chip to ensure that the battery acquisition chip operates within the correct voltage range.

[0013] Optionally, the battery simulator simulates the behavior of several battery cells, and by providing adjustable voltage and current, it simulates the charge and discharge states of different single-cell batteries, and is used for the test and verification of the battery management system BMS. The model of the battery simulator is the 9210 Extended Multi-Channel Tester of NH Research.

[0014] Optionally, the battery acquisition chip receives the voltage signal of the battery simulator and converts the analog signal into a digital signal, featuring high precision and stability. The model of the battery acquisition chip is the BQ76PL455A-Q1 of Texas Instruments, and the model of the regulated power supply is the E3631A triple-output DC power supply of Agilent, which is used to avoid interfering with the sampling data.

[0015] Compared with the prior art, the present utility model has the following advantages:

[0016] In this CMU test device, after connecting a multi-channel line between the battery simulator and the battery sampling chip, a regulated power supply is set on the battery sampling chip. Since the battery simulator can accurately simulate the voltage and state of each battery cell, and the battery sampling chip can collect and monitor the voltage of each simulated battery cell in real time, the regulated power supply provides a stable and clean voltage to the battery sampling chip, eliminating the influence of the working current of the battery sampling chip itself on the chip's acquisition accuracy, improving the voltage sampling accuracy and measurement accuracy of the battery sampling chip, as well as improving the CMU test efficiency and stability. Brief Description of the Drawings

[0017] Figure 1 It is a schematic wiring structure diagram of the CMU test device of the present utility model.

[0018] Reference numerals are: 1. Battery simulator; 2. Battery acquisition chip; 3. Regulated power supply. Detailed Embodiments

[0019] The following will be elaborated in detail through specific embodiments to illustrate the technical solution of the present utility model.

[0020] Referring to Figure 1 As shown, the present utility model discloses a CMU test device structure, including a battery simulator 1, a battery acquisition chip 2, and a regulated power supply 3. The voltage output end of the battery simulator (1) is connected to the voltage sampling input end of the battery acquisition chip (2) by a line. The power input end VBAT+ of the battery acquisition chip (2) is connected to the positive pole + of the regulated power supply (3) by a line, and the power output end VBAT- of the battery acquisition chip (2) is connected to the negative pole - of the regulated power supply (3) by a line;

[0021] Each battery terminal from the B1 - end to the B10 - end of the battery simulator 1 is synchronously connected to the corresponding voltage sampling input ends of the battery acquisition chip 2 at B1 -, Cell - 1 to Cell - 10 through a connecting line to achieve the delivery of voltage signals;

[0022] The regulated power supply 3 provides necessary power supply to the power input end VBAT+ and the power output end VBAT- of the battery acquisition chip 2 to ensure the normal operation of the battery acquisition chip 2 without being affected by the output fluctuation of the battery simulator 1.

[0023] Preferably, the battery simulator 1 includes a B1- terminal, a B1 terminal, a B2 terminal, a B3 terminal, a B4 terminal, a B5 terminal, a B6 terminal, a B7 terminal, a B8 terminal, a B9 terminal, and a B10 terminal to simulate a plurality of battery packs, and the voltage output of the corresponding battery unit is provided at each port from the B1- terminal to the B10 terminal. That is, the B1- terminal is the ground terminal, and the B1 terminal to the B10 terminal are the positive connection terminals simulating each independent battery unit, used to simulate the voltage state of a real battery.

[0024] Preferably, the battery acquisition chip 2 includes a power input terminal VBAT+, a power output terminal VBAT-, a voltage sampling input terminal B1-, a voltage sampling input terminal Cell-1, a voltage sampling input terminal Cell-2, a voltage sampling input terminal Cell-3, a voltage sampling input terminal Cell-4, a voltage sampling input terminal Cell-5, a voltage sampling input terminal Cell-6, a voltage sampling input terminal Cell-7, a voltage sampling input terminal Cell-8, a voltage sampling input terminal Cell-9, and a voltage sampling input terminal Cell-10. Among them, the voltage sampling input terminal B1-, the voltage sampling input terminals Cell-1 to Cell-10 are all used to receive voltage signals from the battery simulator 1, and the voltage sampling input terminal B1- is the reference negative terminal or ground wire of the battery acquisition chip 2, used to establish a reference point for voltage measurement. The voltage sampling input terminals Cell-1 to Cell-10 are the positive voltage sampling input terminals of the battery acquisition chip 2, used to measure the voltage state of each simulated battery from the B1- terminal to the B10 terminal in the battery simulator 1 and perform subsequent data processing and analysis.

[0025] The battery acquisition chip 2 includes 11 channels numbered from 0 to 10, corresponding to the voltage sampling input terminal B1-, the voltage sampling input terminals Cell-1 to Cell-2 from 0 to 10 respectively, used to connect the B1- terminal to the B10 terminal of the battery simulator 1 corresponding to each channel to collect the battery voltage value of the corresponding section, and the collected battery voltage value data is used to simulate the actual single-cell battery voltage to test the voltage monitoring and management functions of the CMU.

[0026] Preferably, the regulated power supply 3 includes a positive terminal + and a negative terminal -, and the power input terminal VBAT+ and the power output terminal VBAT- correspond to the positive terminal + and the negative terminal - of the regulated power supply 3 respectively, used to output a stable power supply voltage to the battery acquisition chip 2 to ensure that the battery acquisition chip 2 operates within the correct voltage range, so as to ensure the stable operation of the battery acquisition chip 2 and prevent the acquisition accuracy from being affected by input voltage fluctuations.

[0027] Preferably, the battery simulator 1 simulates the behavior of a number of battery cells. By providing adjustable voltage and current, it simulates the charge and discharge states of different individual batteries and is used for the testing and verification of the battery management system BMS. The model of the battery simulator 1 is the 9210 Extended Multi-Channel Tester of NH Research.

[0028] Preferably, the battery acquisition chip 2 receives the voltage signal from the battery simulator 1 and converts the analog signal into a digital signal. It features high precision and stability and is used to ensure the accuracy of data conversion and reading. The model of the battery acquisition chip 2 is the BQ76PL455A-Q1 of Texas Instruments, and the model of the regulated power supply 3 is the E3631A triple-output DC power supply of Agilent, which is used to avoid interfering with the sampled data.

[0029] Working principle: The positive terminal + and negative terminal - on the regulated power supply 3 are connected to the power input terminal VBAT+ and power output terminal VBAT- on the battery acquisition chip 2, so that the regulated power supply 3 provides a stable working voltage for the battery acquisition chip 2 and ensures its stable operation. Then, the voltage sampling input terminals B1-, Cell-1 to Cell-10 of each channel of the battery acquisition chip 2 respectively receive the voltage signals from the negative terminal connection ends B1- to B10- of the battery simulator 1 simulating independent battery cells, that is, the voltage values of the actual individual batteries are collected for testing the voltage monitoring and management of the CMU. This solves the problem that the voltage sampling accuracy is affected by the working current fluctuation of the battery sampling chip itself and can be compatible with battery simulators of multiple brands, improving the accuracy and stability of the voltage acquisition test of the battery sampling chip.

[0030] The above are only the preferred embodiments of the present invention and are not used to limit the invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention shall be included within the protection scope of the present invention.

Claims

1. A CMU test device, characterized in that: It includes a battery simulator (1), a battery acquisition chip (2), and a regulated power supply (3). The voltage output terminal of the battery simulator (1) is connected to the voltage sampling input terminal of the battery acquisition chip (2) by a circuit. The power input terminal VBAT+ of the battery acquisition chip (2) is connected to the positive terminal + of the regulated power supply (3) by a circuit, and the power output terminal VBAT- of the battery acquisition chip (2) is connected to the negative terminal - of the regulated power supply (3) by a circuit.

2. The CMU testing device according to claim 1, wherein: The battery simulator (1) includes terminals B1-, B1, B2, B3, B4, B5, B6, B7, B8, B9, and B10. Each terminal from B1- to B10 provides the voltage output of the corresponding battery cell. That is, the B1- terminal is the ground terminal, and the B1 to B10 terminals are the positive connection terminals simulating each independent battery cell.

3. The CMU testing device according to claim 2, characterized in that: The battery acquisition chip (2) includes a power input terminal VBAT+, a power output terminal VBAT-, a voltage sampling input terminal B1-, voltage sampling input terminals Cell-1, Cell-2, Cell-3, Cell-4, Cell-5, Cell-6, Cell-7, Cell-8, Cell-9, and Cell-10. Among them, the voltage sampling input terminal B1-, the voltage sampling input terminals Cell-1 to Cell-10 are all used to receive voltage signals from the battery simulator (1). The battery acquisition chip (2) includes 11 channels numbered 0 - 10, corresponding to the voltage sampling input terminal B1-, the voltage sampling input terminals Cell-1 to Cell-10 from 0 - 10 respectively.

4. The CMU testing device according to claim 3, wherein: The regulated power supply (3) includes a positive terminal + and a negative terminal -. The power input terminal VBAT+ and the power output terminal VBAT- respectively correspond to the positive terminal + and the negative terminal - of the regulated power supply (3).

5. The CMU testing device according to claim 3, wherein: The battery simulator (1) simulates the behavior of several battery cells by providing adjustable voltage and current to simulate the charge and discharge states of different single cells. The model of the battery simulator (1) is the 9210 Extended Multi-Channel Tester of NH Research.

6. The CMU testing device according to claim 3, characterized in that: The battery acquisition chip (2) receives the voltage signal of the battery simulator (1) and converts the analog signal into a digital signal. The model of the battery acquisition chip (2) is the BQ76PL455A-Q1 of Texas Instruments, and the model of the regulated power supply (3) is the E3631A Triple Output DC Power Supply of Agilent.

Images