CN115856389A - BMS component path current high-precision detection method - Google Patents
BMS component path current high-precision detection method Download PDFInfo
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- CN115856389A CN115856389A CN202211304212.XA CN202211304212A CN115856389A CN 115856389 A CN115856389 A CN 115856389A CN 202211304212 A CN202211304212 A CN 202211304212A CN 115856389 A CN115856389 A CN 115856389A
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Abstract
The invention discloses a BMS component path current high-precision detection method, which belongs to the technical field of electric vehicle battery current detection, and in the detection method, a SHUT resistor and a fluxgate current sensor respectively transmit the acquired current to an MCU module: the MCU module processes the acquired data, and outputs the current acquired by the SHUNT resistor when a current signal of more than 5A is acquired; when the current of <5A is collected, the current collected by the fluxgate sensor is output. The invention has the advantages that the current testing precision is improved, the micro current can be accurately sensed, and the error is greatly reduced; the SOC data of the power automobile is more accurate, and the condition of no electricity is avoided; the MCU module can compensate and correct the measured current value and reduce errors.
Description
Technical Field
The invention relates to a battery current detection technology of an electric vehicle, in particular to a BMS component path current high-precision detection method.
Background
Nowadays, electric vehicles are increasingly popular, requirements for detection accuracy of battery energy storage capacity are higher and higher, and especially requirements for current detection in power batteries are more rigorous. The SOC calculation accuracy of the power battery highly depends on the current collection accuracy of the BMS on the battery, and one-point errors of current collection can cause the huge errors of the SOC after the current collection is accumulated for a long time and a long time, so that the phenomenon of continuous voyage and air power of the automobile is caused.
The BMS is a Battery management system (Battery management system) and is responsible for monitoring and processing the current, temperature, power and voltage of the power Battery.
In new forms of energy electric motor car power battery field, BMS's current collection mainly through two kinds of modes:
one is collected for the Hall current sensor, the principle that the electric current measures is Hall principle, its advantage is without power loss, the high-level insulation is withstand voltage, but the volume is large, the initial excursion is big, there is noise and signal interference, the linearity is bad, the stability is low, the temperature coefficient is high, the measuring range is limited and the cost is high;
the other type is SHUNT precision resistance collection, the current collection principle is ohm law, namely I = U/R, and the SHUNT precision resistance collection device has the advantages of small size, no initial offset, low noise, good linearity and low cost, and has the defects of certain power loss, resistance increase along with current, temperature rise and loss increase.
The acquisition precision of the two current acquisition modes is not high enough, and particularly, acquisition errors exist in the acquisition precision of micro current, so that the SOC value displayed on the automobile can be influenced finally, and the phenomenon of no electricity occurs.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a BMS component path current high-precision detection method for solving the technical problems.
In order to realize the purpose, the invention provides the following technical scheme:
a BMS component path current high-precision detection method comprises the following steps:
s1, a battery pack of a power battery transmits current to a motor of the electric vehicle through a fluxgate sensor and a SHUNT resistor,
meanwhile, the battery pack transmits the current to the current acquisition module and directly transmits the current to the motor of the electric vehicle;
s2, the fluxgate sensor and the SHUNT resistor transmit the acquired current signal to the MCU module, and the MCU module processes the acquired data:
when the current signal of >5A is collected, the current collected by the SHUNT resistor is output to the current collecting module,
when a current signal of <5A is acquired, outputting the current acquired by the fluxgate sensor to a current acquisition module;
and S3, the BMS battery management system receives and processes the current signals received by the current acquisition module.
Further, the fluxgate sensor is replaced with a hall current sensor.
Further, the fluxgate sensor is replaced with a Rogowski coil.
Further, the fluxgate sensor is replaced with a giant magnetoresistance current sensor.
Further, the fluxgate sensor is replaced with a giant magneto-impedance current sensor.
Further, the fluxgate sensor is replaced with a hysteresis current sensor.
Further, the fluxgate sensor is replaced with a fiber optic current sensor.
Further, the fluxgate sensor is replaced with a chip-type current sensor.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the current testing precision is improved, the micro current can be accurately sensed, and the error is greatly reduced;
2. the SOC data of the power automobile is more accurate, and the condition of no electricity is avoided;
3. the MCU module can compensate and correct the measured current value and reduce errors.
Drawings
FIG. 1 is a detection block diagram of the present invention.
Fig. 2 is a diagram of the SHUNT resistance acquisition.
Fig. 3 is a sampling block diagram of the fluxgate sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In order to adapt to the high-precision current acquisition requirement of the SOC on the power battery, the invention combines a high-precision current sensor on the basis of the original SHUT resistance current acquisition method, and the SHUNT resistance and the fluxgate sensor are used for acquiring currents with different measuring ranges respectively.
The fluxgate sensor is based on the principle that the weak magnetic field is measured by utilizing the nonlinear relation between the magnetic induction intensity and the magnetic field intensity of a high-permeability magnetic core in a measured magnetic field under the saturated excitation of an alternating magnetic field, so as to indirectly obtain the measured current value.
The combined fluxgate sensor has significantly improved measurement accuracy for minute currents (< 5A), while the acquisition accuracy of the SHUNT resistance for a small range is lower than that of the flux sensor. Therefore, the flux gate sensor is focused on the acquisition of a small current range, and the acquisition precision is improved; for the SHUNT resistor, a manganese-copper alloy resistor material is adopted, the material is adaptive to a large-current range acquisition scene, the stability is higher, the temperature coefficient is lower, and the current acquisition is more accurate.
As shown in fig. 1, in the acquisition circuit, the SHUT resistor and the fluxgate current sensor both transmit the acquired current to the MCU module: the MCU module processes the acquired data, and outputs the current acquired by the SHUNT resistor when acquiring a current signal of more than 5A; when the current of <5A is collected, the current collected by the fluxgate sensor is output.
Besides fluxgates, other current detection modes can be replaced according to requirements for the current sensor matched with the SHUNT resistor, such as a hall current sensor, a Rogowski coil, a giant magnetoresistance current sensor, a hysteresis telescopic current sensor, an optical fiber current sensor, a chip type current sensor and the like, which can meet the requirement of improving the measurement precision.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art should be able to make general changes and substitutions within the technical scope of the present invention.
Claims (8)
1. A BMS component path current high-precision detection method is characterized by comprising the following steps:
s1, a battery pack of a power battery transmits current to a motor of the electric vehicle through a fluxgate sensor and a SHUNT resistor,
meanwhile, the battery pack transmits the current to the current acquisition module and directly transmits the current to the motor of the electric vehicle;
s2, the fluxgate sensor and the SHUNT resistor transmit the acquired current signal to the MCU module, and the MCU module processes the acquired data:
when the current signal of >5A is collected, the current collected by the SHUNT resistor is output to the current collecting module,
when a current signal of <5A is acquired, outputting the current acquired by the fluxgate sensor to a current acquisition module;
and S3, the BMS battery management system receives and processes the current signals received by the current acquisition module.
2. The BMS component current high-precision detection method according to claim 1, wherein a fluxgate sensor is replaced with a Hall current sensor.
3. The BMS component path current high accuracy detecting method of claim 1, wherein the fluxgate sensor is replaced with a Rogowski coil.
4. The BMS component stroke current high-precision detection method according to claim 1, wherein a fluxgate sensor is replaced with a giant magnetoresistance current sensor.
5. The BMS component current high-precision detection method according to claim 1, wherein the fluxgate sensor is replaced with a giant magneto-impedance current sensor.
6. The BMS component current high-precision detection method according to claim 1, wherein a fluxgate sensor is replaced with a hysteresis current sensor.
7. The BMS component current high-precision detection method according to claim 1, wherein a fluxgate sensor is replaced with an optical fiber current sensor.
8. The BMS component current high-precision detection method according to claim 1, wherein the fluxgate sensor is replaced with a chip-type current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211304212.XA CN115856389A (en) | 2022-10-24 | 2022-10-24 | BMS component path current high-precision detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211304212.XA CN115856389A (en) | 2022-10-24 | 2022-10-24 | BMS component path current high-precision detection method |
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| CN115856389A true CN115856389A (en) | 2023-03-28 |
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| CN202211304212.XA Pending CN115856389A (en) | 2022-10-24 | 2022-10-24 | BMS component path current high-precision detection method |
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- 2022-10-24 CN CN202211304212.XA patent/CN115856389A/en active Pending
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