CN212410804U - High-voltage battery pack BMS capacity and electric quantity detection device - Google Patents
High-voltage battery pack BMS capacity and electric quantity detection device Download PDFInfo
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- CN212410804U CN212410804U CN202021848546.XU CN202021848546U CN212410804U CN 212410804 U CN212410804 U CN 212410804U CN 202021848546 U CN202021848546 U CN 202021848546U CN 212410804 U CN212410804 U CN 212410804U
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Abstract
The utility model relates to a direct current power supply system, it discloses a high voltage battery group BMS is with capacity electric quantity detection device, realizes the sampling of real-time high frequency, the full range of high accuracy and the capacity of low error, electric quantity calculation function. The device comprises a current sensor, a voltage sensor, a filter circuit, a differential circuit, a segmented amplification and following reverse circuit, a signal switching circuit, an AD sampling circuit, an isolation circuit, an MCU/DSP control circuit and a double-reference circuit, wherein the current sensor, the voltage sensor, the filter circuit, the differential circuit, the segmented amplification and following reverse circuit, the signal switching circuit, the AD sampling circuit, the isolation circuit and the MCU/DSP control circuit are; the MCU/DSP control circuit is connected with the control end of the signal switching circuit; the double-reference circuit provides reference voltage for the segmented amplifying circuit and the AD sampling circuit. The utility model is suitable for an in high-voltage battery group or the similar equipment.
Description
Technical Field
The utility model relates to a direct current power supply system, concretely relates to high voltage battery group BMS (battery management system) is with capacity electric quantity detection device.
Background
High-voltage battery packs (generally, battery packs with voltages higher than 48V) are used as direct-current power supply systems in the energy storage field and the power field, and have high requirements on the calculation accuracy of capacity and electric quantity. The capacity and electric quantity detection device for the high-voltage battery pack BMS (battery management system) is used for sampling a full-range with high frequency and high precision in a full-range in real time in the use process of the high-voltage battery pack, realizes the functions of capacity and electric quantity calculation with low error, and is important equipment for state management and state reflection of the high-voltage battery pack.
Along with the further improvement of the overall technical index requirements of the high-voltage battery pack, the requirements on the accuracy and the real-time performance of capacity and electric quantity are higher and higher, and particularly in the field of power, the application working condition of the high-voltage battery pack is more complex, and the load change frequency is higher. Therefore, the high-voltage battery pack must be independently detected by means of a separate high-precision capacity and electric quantity detection device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the capacity and electric quantity detection device for the high-voltage battery pack BMS is provided, and the functions of real-time high-frequency and high-precision full-range sampling and low-error capacity and electric quantity calculation are achieved.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
a capacity charge amount detecting device for a high voltage battery pack BMS, comprising:
the device comprises a current sensor, a voltage sensor, a filter circuit, a differential circuit, a segmented amplification and following reverse circuit, a double-reference circuit, a signal switching circuit, an AD sampling circuit, an isolation circuit and an MCU/DSP control circuit;
the output ends of the voltage sensor and the current sensor are connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end of the differential circuit; the output end of the differential circuit is connected with the input end of the segmented amplification and following reverse circuit; the output end of the segmented amplification and following reverse circuit is connected with the input end of the signal switching circuit, and the output end of the signal switching circuit is connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is connected with the MCU/DSP control circuit through an isolation circuit; the MCU/DSP control circuit is connected with the control end of the signal switching circuit; the double-reference circuit provides reference voltage for the segmented amplifying circuit and the AD sampling circuit.
As a further optimization, the current sensor is a hall current sensor, and the voltage sensor is a hall voltage sensor.
As a further optimization, the signal switching circuit has the same number of input channels as the output ends of the segmented amplifying and following inverting circuits, and gates the corresponding input channels under the control of the MCU/DSP control circuit.
As a further optimization, the segmented amplifying and following reverse circuit comprises a segmented amplifying circuit and a following reverse circuit which are connected in parallel, and the segmented amplifying circuit is used for performing segmented amplification processing on an output signal of the sensor when the output signal is smaller than a threshold value; and the following reverse circuit is used for following or reversing the output signal when the output signal of the sensor is greater than or equal to a threshold value.
The utility model has the advantages that:
based on the design of the device, firstly, filtering the output signals of the sensor, eliminating line voltage drop and ground wire interference through a differential circuit, then carrying out different processing according to the size of the signals, carrying out segmented amplification processing on smaller signals, carrying out following and reversing on larger signals, inputting the processed signals to an AD sampling circuit for sampling at intervals under the gating control of a controller through a signal switching circuit, and finally inputting the processed signals to the controller to read sampling values for capacity and electric quantity calculation; the device can be used for periodically carrying out high-precision sampling on analog quantity with high frequency, realizing full-range accurate real-time sampling of voltage and current of the high-voltage battery pack, realizing high-accuracy calculation of capacity and electric quantity, and being suitable for the high-voltage battery pack or similar equipment.
Drawings
Fig. 1 is a schematic diagram of a capacity and charge amount detecting device for a high voltage battery pack BMS in an embodiment.
Detailed Description
The utility model aims at providing a high voltage battery group BMS is with capacity electric quantity detection device realizes the sampling of real-time high frequency, the full range scope of high accuracy and the capacity of low error, electric quantity calculation function.
Example (b):
as shown in fig. 1, the capacity and power detection apparatus for a high-voltage battery pack BMS in the present embodiment includes a current sensor, a voltage sensor, a filter circuit, a differential circuit, a segmented amplification and following inverter circuit, a dual reference circuit, a signal switching circuit, an AD sampling circuit, an isolation circuit, and an MCU/DSP control circuit;
the output ends of the voltage sensor and the current sensor are connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end of the differential circuit; the output end of the differential circuit is connected with the input end of the segmented amplification and following reverse circuit; the output end of the segmented amplification and following reverse circuit is connected with the input end of the signal switching circuit, and the output end of the signal switching circuit is connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is connected with the MCU/DSP control circuit through an isolation circuit; the MCU/DSP control circuit is connected with the control end of the signal switching circuit; the double-reference circuit provides reference voltage for the segmented amplifying circuit and the AD sampling circuit.
The current sensor adopts a fluxgate technology or a Hall technology current sensor with high precision, high linearity and low temperature drift, and the output mode is a current type or a voltage type.
The voltage sensor adopts a Hall technology voltage sensor with high precision, high linearity and low temperature drift, and the output mode is a voltage type.
The filter circuit is used for carrying out differential mode common mode filtering on the output signals of the sensor, and the accuracy is improved.
The differential circuit is a 1:1 high-precision differential operational amplifier circuit and is used for signal conversion and eliminating line voltage drop and ground wire interference.
The segmented amplifying and following reverse circuit comprises a segmented amplifying circuit and a following reverse circuit which are connected in parallel; when the segmented amplifying circuit is used for small-load voltage and small-load current, small signals output by the sensor are amplified in a segmented mode and are subjected to differential amplification with a reference source, positive and negative signals output by the sensor are guaranteed, the amplified signals are positive values, the output range of the operational amplifier after segmented amplification is controlled, and the output range is matched with the reference source of the AD sampling circuit, so that high-resolution identification is achieved, the identification capability of the AD sampling circuit is improved, errors are reduced, and the precision is improved.
When the following reverse circuit is used for outputting a larger signal by the sensor, amplification is not carried out any more, the following or 1:1 reverse recognition is carried out on the output signal, the positive and negative values of the output signal of the sensor are distinguished by comparing and recognizing the two signals, and the threshold value selection of the larger signal is matched with the range of the output signal of the sensor and a reference source of the AD sampling circuit, so that high-resolution recognition is finally realized, the recognition capability of the AD sampling circuit is improved, the error is reduced, and the precision is improved.
The dual reference circuit is used to provide two voltage references: one path is used as the reference of the operational amplifier of the segmented amplifying circuit, and the other path is used as the reference of the AD sampling circuit.
The signal switching circuit is used for amplifying signals of all sections and sending the signals to the AD sampling circuit at intervals.
The AD sampling circuit is used for sampling each analog quantity with high precision.
The isolation communication circuit is used for isolating the AD sampling circuit from the MCU/DSP control circuit.
The MCU/DSP control circuit is used for controlling the signal switching circuit and reading an AD sampling result.
Based on the device, firstly, the output signals of the sensor are filtered, the line voltage drop and the ground wire interference are eliminated through the differential circuit, then different processing is carried out according to the size of the signals, the smaller signals are amplified in a segmented mode, the larger signals are followed and reversed, the processed signals are input to the AD sampling circuit through the signal switching circuit at intervals under the gating control of the controller for sampling, and finally the processed signals are input to the controller to read sampling values for capacity and electric quantity calculation.
Claims (4)
1. A capacity and capacity detecting device for a high voltage battery pack BMS, comprising:
the device comprises a current sensor, a voltage sensor, a filter circuit, a differential circuit, a segmented amplification and following reverse circuit, a double-reference circuit, a signal switching circuit, an AD sampling circuit, an isolation circuit and an MCU/DSP control circuit;
the output ends of the voltage sensor and the current sensor are connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end of the differential circuit; the output end of the differential circuit is connected with the input end of the segmented amplification and following reverse circuit; the output end of the segmented amplification and following reverse circuit is connected with the input end of the signal switching circuit, and the output end of the signal switching circuit is connected with the input end of the AD sampling circuit; the output end of the AD sampling circuit is connected with the MCU/DSP control circuit through an isolation circuit; the MCU/DSP control circuit is connected with the control end of the signal switching circuit; the double-reference circuit provides reference voltage for the segmented amplifying circuit and the AD sampling circuit.
2. The capacity charge amount detecting device for a high voltage battery pack BMS according to claim 1,
the current sensor adopts a Hall current sensor, and the voltage sensor adopts a Hall voltage sensor.
3. The capacity charge amount detecting device for a high voltage battery pack BMS according to claim 1,
the signal switching circuit is provided with input channels with the same number as the output ends of the segmented amplification and following reverse circuit, and corresponding input channels are gated under the control of the MCU/DSP control circuit.
4. The capacity charge amount detecting device for a high voltage battery pack BMS according to claim 3,
the segmented amplifying and following reverse circuit comprises a segmented amplifying circuit and a following reverse circuit which are connected in parallel, and the segmented amplifying circuit is used for carrying out segmented amplification processing on an output signal of the sensor when the output signal is smaller than a threshold value; and the following reverse circuit is used for following or reversing the output signal when the output signal of the sensor is greater than or equal to a threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848546.XU CN212410804U (en) | 2020-08-28 | 2020-08-28 | High-voltage battery pack BMS capacity and electric quantity detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848546.XU CN212410804U (en) | 2020-08-28 | 2020-08-28 | High-voltage battery pack BMS capacity and electric quantity detection device |
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| Publication Number | Publication Date |
|---|---|
| CN212410804U true CN212410804U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021848546.XU Active CN212410804U (en) | 2020-08-28 | 2020-08-28 | High-voltage battery pack BMS capacity and electric quantity detection device |
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| Country | Link |
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| CN (1) | CN212410804U (en) |
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- 2020-08-28 CN CN202021848546.XU patent/CN212410804U/en active Active
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Address after: No. 519 Sanjiang Avenue, Mianyang Economic Development Zone, Sichuan 621000 Patentee after: Sichuan Changhong Power Supply Co.,Ltd. Country or region after: China Address before: No. 519 Sanjiang Avenue, Mianyang Economic Development Zone, Sichuan 621000 Patentee before: SICHUAN CHANGHONG BATTERY Co.,Ltd. Country or region before: China |