CN205384360U - BMS current parameter calibrating device - Google Patents

Abstract

The utility model discloses a BMS current parameter calibration device, which comprises a large current output device connected in sequence to form a loop, a first shunt and a BM current detection unit. The high-current output device has a positive terminal and a negative terminal, the input terminal of the first shunt is connected to the positive terminal of the high-current output device, and the output terminal of the first shunt is connected to the BMS current detection unit connected to the input terminal of the BMS current detection unit, the output terminal of the BMS current detection unit is connected to the negative terminal of the large current output device, and the BMS current parameter calibration device also includes a parallel connection with the first shunt for adjusting the first shunt The voltage detection unit for detecting the divided voltage. The utility model can accurately calculate the reference current output by the high-current output device, provide high-precision reference current for the current parameter calibration of the BMS, greatly improve the accuracy of the BMS current parameter calibration, and does not require high-precision high-current equipment or high-current detection equipment. Realization cost is low.

Description

A BMS current parameter calibration device

technical field

The utility model relates to a calibration device, in particular to a BMS current parameter calibration device.

Background technique

One of the main functions of BMS (Battery Management System, battery management system) is current detection. The accuracy of current detection will affect the estimation of SOC (State of Charge, battery capacity) and current fault detection (charge and discharge current is too high). Manufacturers put forward stricter requirements for the current parameter calibration process in the process of producing BMS.

The principle of BMS current parameter calibration is: use a large current output device as a current source to output a large current, and then use a large current detection device to detect the large current output by the large current output device as a reference current, and the current detection unit of the BMS detects the output of the large current output device The large current is used as the detection current, and the current parameters of the BMS are calibrated according to the comparison results by comparing the reference current with the detection current detected by the BMS.

Therefore, in order to ensure the accuracy of BMS current detection, the BMS production calibration process requires a high-precision high-current device to output high-precision reference current (only a few manufacturers can do it). A poor current source, for example, needs to output 500A, but the actual output of the device may only be 490A, and the accuracy of the reference current directly affects the calibration accuracy of the BMS current parameters.

On the other hand, the high-current detection equipment for measuring large currents is expensive, and BMS manufacturers seldom purchase high-current detection equipment separately and use them at the same time as high-current output equipment to ensure the accuracy of BMS current calibration, which results in the accuracy of BMS current parameter calibration Unable to achieve a more ideal state.

To sum up, the BMS current parameter calibration device in the prior art cannot obtain a high-precision reference current for the BMS to calibrate the current parameters under the condition of low cost.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a low-cost, high-precision BMS current parameter calibration device.

The purpose of this utility model is achieved through the following technical solutions:

A BMS current parameter calibration device, used for calibrating BMS current parameters, including a large current output device connected in sequence to form a loop, a first shunt and a BMS current detection unit;

The high-current output device has a positive terminal and a negative terminal, the input terminal of the first shunt is connected to the positive terminal of the high-current output device, and the output terminal of the first shunt is connected to the BMS current detection unit The input terminal of the BMS current detection unit is connected to the negative terminal of the high current output device;

The BMS current parameter calibration device further includes a voltage detection unit connected in parallel with the first shunt and used for detecting the divided voltage of the first shunt.

As a preferred solution of the utility model, the model of the first shunt is 1000A/100mv.

As a preferred solution of the present invention, the BMS current detection unit is a Hall sensor.

As a preferred solution of the present invention, the BMS current detection unit is a second shunt.

As a preferred solution of the present invention, the voltage detection unit is a multimeter.

As a preferred solution of the utility model, the voltage acquisition accuracy of the multimeter is 0.001mv.

Compared with the prior art, the utility model has the following advantages:

1. The utility model replaces the high-precision high-current detection equipment of the prior art by the first shunt and the voltage detection unit, which can accurately calculate the reference current output by the high-current output device, and provide high-precision reference current for the current parameter calibration of the BMS. Greatly improve the accuracy of BMS current parameter calibration.

2. The utility model uses the first shunt and the voltage detection unit to accurately calculate the reference current output by the high-current output device, so that the calibration of the BMS current parameters does not require high-precision high-current equipment or high-current detection equipment, and the implementation cost is low.

Description of drawings

FIG. 1 is a schematic diagram of a BMS current parameter calibration device according to an embodiment of the present invention.

detailed description

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

As shown in FIG. 1 , it is a schematic diagram of a BMS current parameter calibration device 10 according to an embodiment of the present invention. A BMS current parameter calibration device 10 is used to calibrate the BMS current parameters, comprising a large current output device 100 connected in sequence to form a loop, a first shunt 200 and a BMS current detection unit 300 .

The large current output device 100 has a positive end 110 and a negative end 120, the input end of the first shunt 200 is connected to the positive end 110 of the high current output device, the output end of the first shunt 200 is connected to the input end of the BMS current detection unit 300 connected, the output terminal of the BMS current detection unit 300 is connected to the negative terminal 120 of the large current output device 100 . The BMS current parameter calibration device 10 further includes a voltage detection unit 400 connected in parallel with the first shunt 200 for detecting the divided voltage of the first shunt 200 . In this embodiment, the voltage detection unit 400 is a multimeter.

In the utility model, by connecting the first shunt 200 between the large current output device 100 and the BMS current detection unit 300, and then using a multimeter to detect the voltage of the first shunt 200, and finally through the voltage detected by the multimeter and The resistance value of the shunt is used to convert the reference current value to obtain a high-precision reference current value. In practical applications, the resistance value of the first shunt 200 can be set in the host computer, and the voltage value detected by the multimeter can be input into the host computer, and the resistance value of the first shunt 200 can be detected by the host computer according to the resistance value of the first shunt 200 and the multimeter. The voltage value is calculated with reference to the reference current value, and then the reference current value is sent to the BMS. The BMS compares the reference current value with the current value detected by the current detection unit, and calibrates the current parameters according to the comparison result. It is also possible to set the resistance value of the first shunt 200 in the BMS, and input the voltage value detected by the multimeter into the BMS, and calculate the reference value through the BMS according to the resistance value of the first shunt 200 and the voltage value detected by the multimeter The current value is compared with the reference current value and the current value detected by the current detection unit, and the current parameters are calibrated according to the comparison result.

When the model of the first shunt 200 used is 1000A/100mv, that is, when the output current of the first shunt 200 is 1000A, the voltage across the first shunt 200 is 100mv, so the voltage across the first shunt 200 is 1mv , the corresponding output current is 10A.

Therefore, when the multimeter 400 with a voltage acquisition accuracy of 0.001mv is used to test the first shunt 200 with a model of 1000A/100mv, the current detection accuracy at both ends of the first shunt 200 can be obtained through the above conversion rule of 1mv voltage corresponding to 10A current. 10mA, thereby achieving the purpose of high-precision current detection, so as to meet the needs of BMS current parameter calibration accuracy.

Therefore, if a multimeter with higher precision is used to test the voltage across the first shunt 200, the accuracy of the reference current obtained through conversion will be higher, thereby meeting the requirements for calibration accuracy of BMS current parameters of different specifications and greatly improving The practicability of the present utility model has been realized.

In an embodiment of the present invention, the BMS current detection unit 300 is a Hall sensor. In another embodiment of the present invention, the BMS current detection unit 300 is a second shunt.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (6)

1. A BMS current parameter calibration device, used to calibrate the BMS current parameters, is characterized in that it comprises a large current output device, a first shunt and a BMS current detection unit connected in turn to form a loop; The high-current output device has a positive terminal and a negative terminal, the input terminal of the first shunt is connected to the positive terminal of the high-current output device, and the output terminal of the first shunt is connected to the BMS current detection unit The input terminal of the BMS current detection unit is connected to the negative terminal of the high current output device; The BMS current parameter calibration device further includes a voltage detection unit connected in parallel with the first shunt and used for detecting the divided voltage of the first shunt. 2. The device for calibrating BMS current parameters according to claim 1, wherein the model of the first shunt is 1000A/100mv. 3. The BMS current parameter calibration device according to claim 1, wherein the BMS current detection unit is a Hall sensor. 4. The BMS current parameter calibration device according to claim 1, wherein the BMS current detection unit is a second shunt. 5. The BMS current parameter calibration device according to claim 1, wherein the voltage detection unit is a multimeter. 6. The BMS current parameter calibration device according to claim 5, characterized in that, the multimeter voltage acquisition accuracy is 0.001mv.