CN221174938U - BMS sampling current's calibration control panel and system - Google Patents

Abstract

The utility model provides a BMS sampling current calibration control board and a BMS sampling current calibration control system, wherein a current direction switching circuit, a driving circuit and a singlechip are arranged; the current direction switching circuit is used for switching the current direction between the direct current source and the battery pack; the current direction switching circuit is electrically connected with the singlechip through the driving circuit, so that BMS sampling current is realized, and the accuracy of the sampling current is improved.

Description

BMS sampling current's calibration control panel and system

Technical Field

The utility model relates to the field of battery management, in particular to a BMS sampling current calibration control board and system.

Background

Currently, the new energy industry is rapidly developing, and along with the increase of the demand of the output, the production management and control of the battery pack and the BMS are more and more important. Incomplete testing will affect the life of the battery, wherein the accuracy of the sampled current of the BMS directly affects the SOC calculation of the battery and the battery safety. If the discharge sampling current is higher, the accumulated discharge electric quantity is higher during discharge, so that the BMS judges that the battery electric quantity is discharged before the battery electric quantity is not discharged, and then stops outputting in advance; if the discharge sampling current is lower, the threshold value of the discharge overcurrent protection point is higher, so that the protection point is actually reached, the BMS is not protected, and the safe use of the battery is not facilitated; if the charged sampling current is inaccurate, a series of problems such as abnormal SOC and misjudgment of the BMS can be caused.

Therefore, there is a need for a calibration control board and system for BMS sampling current to improve the above-mentioned problems.

Disclosure of utility model

The utility model aims to provide a BMS sampling current calibration control board and a BMS sampling current calibration control board system, which are used for realizing BMS sampling current and improving sampling current precision.

In a first aspect, the utility model provides a calibration control board for BMS sampling current, which comprises a current direction switching circuit, a driving circuit and a singlechip;

The current direction switching circuit is used for switching the current direction between the direct current source and the battery pack;

The current direction switching circuit is electrically connected with the singlechip through the driving circuit.

The calibration control board has the beneficial effects that: the current direction switching circuit, the driving circuit and the singlechip are arranged; the current direction switching circuit is used for switching the current direction between the direct current source and the battery pack; the current direction switching circuit is electrically connected with the singlechip through the driving circuit, so that BMS sampling current is realized, and the accuracy of the sampling current is improved.

Optionally, the device further comprises a power module;

The power module is electrically connected with the single chip.

Optionally, the battery pack also comprises a communication circuit for communicating with the direct current source and/or the battery pack;

The communication circuit is electrically connected with the single chip. The power supply has the beneficial effects of being convenient for communication with a direct current source and/or a battery pack.

Optionally, the current direction switching circuit is composed of 8N-MOS;

When CHG is high and DCHG is low, N-MOS1, N-MOS2, N-MOS5 and N-MOS6 are on, N-MOS3, N-MOS4, N-MOS7 and N-MOS8 are off, current flows out from the positive electrode of the direct current source, passes through N-MOS5, N-MOS6 to B-, passes through the switch MOS of the BMS, and the sampling resistor returns to P-, and returns to N-MOS1 and N-MOS2, and finally returns to the negative electrode of the direct current source; when CHG is low and DCHG is high, the current discharges from P-to B-. The DC source has the advantages that the current direction switching circuit is composed of 8N-MOSs, when CHG is high and DCHG is low, N-MOS1, N-MOS2, N-MOS5 and N-MOS6 are conducted, N-MOS3, N-MOS4, N-MOS7 and N-MOS8 are cut off, current flows out from the positive electrode of the DC source, passes through N-MOS5, N-MOS6 to B-, passes through the switch MOS of the BMS, and the sampling resistor returns to P-, and returns to N-MOS1 and N-MOS2, and finally returns to the negative electrode of the DC source; when CHG is low and DCHG is high, the current discharges from P-to B-so as to conveniently switch the current direction and improve the accuracy of sampling current.

Optionally, the driving circuit is composed of NPN triodes Q1, Q3, PNP triodes Q2, Q4 and a plurality of resistor-capacitor parts;

When the IO port ARM_CHG of the singlechip is set high, the triode Q3 is conducted, the voltage drop on the resistor R103 is larger than 0.7V, the resistor Q4 is conducted, and the voltage of the CHG is output to be 10V through the partial pressure of R105 and R106; when the IO port ARM_CHG of the singlechip is set low, the triodes Q3 and Q4 are cut off, and the voltage output of the CHG is 0V; when the IO port ARM_DCHG of the singlechip is set high, the triodes Q1 and Q2 are conducted, and the voltage output of the DCHG is 10V; when the IO port ARM_DCHG of the singlechip is set low, the triodes Q1 and Q2 are cut off, and the voltage output of the DCHG is 0V. The charge-discharge simulation device has the beneficial effects that the drive circuit is arranged and consists of NPN triodes Q1 and Q3, PNP triodes Q2 and Q4 and a plurality of resistor-capacitor parts, so that the current direction between B-and P-can be conveniently controlled, and different current directions during charge and discharge can be simulated.

Optionally, the model of the singlechip is STM32F103CBT6. The beneficial effects of the method are that the SCM model is STM32F103CBT6, so that the power consumption is low and the performance is high.

In a second aspect, the present utility model provides a calibration system for calibrating a sampling current of a BMS, comprising a calibration control board, a direct current source, a battery pack and the BMS as any one of the possible calibration control boards in the first aspect;

the direct current source is electrically connected with the battery pack through the calibration control board;

the BMS is disposed between P-and B-of the battery pack;

The calibration control board communicates with the direct current source and the BMS, respectively.

The calibration system of the utility model has the beneficial effects that: by arranging a calibration control board, a direct current source, a battery pack and a BMS; the direct current source is electrically connected with the battery pack through the calibration control board; the BMS is disposed between P-and B-of the battery pack; the calibration control board is respectively communicated with the direct current source and the BMS, so that BMS sampling current is realized, and the accuracy of the sampling current is improved.

Optionally, the direct current source is an adjustable direct current source with a communication circuit.

Optionally, the control chip of the BMS is STM32F103CBT6. The beneficial effects of the control chip of the BMS are that the control chip is STM32F103CBT6, so that the power consumption is low and the performance is high.

Optionally, the BMS further includes a MOS switch and a sampling resistor;

And the MOS switch and the sampling resistor are respectively and electrically connected with the control chip.

Drawings

Fig. 1 is a schematic structural diagram of a calibration control board and a system for BMS sampling current according to an embodiment of the present utility model;

Fig. 2 is a schematic diagram of a driving circuit of a calibration control board for BMS sampling current according to an embodiment of the present utility model;

Fig. 3 is a schematic diagram of a charge-discharge current direction switching circuit of a calibration control board for BMS sampling current according to an embodiment of the present utility model.

[ Reference numerals description ]

1. A control board; 2. a direct current source; 3. a battery pack;

11. A power module; 12. a communication circuit; 13. a current direction switching circuit; 14. a driving circuit; 15. a single chip microcomputer;

31、BMS；

311. a MOS switch; 312. and (5) sampling the resistor.

Detailed Description

The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.

Referring to fig. 1, a calibration control board 1 for BMS sampling current includes a power module 11, a communication circuit 12, a current direction switching circuit 13, a driving circuit 14 and a single chip microcomputer 15; the current direction switching circuit 13 is used for switching the current direction between the adjustable direct current source 2 with communication and the battery pack 3; the current direction switching circuit 13 is electrically connected with the singlechip 15 through the driving circuit 14; the power module 11 is electrically connected with the singlechip 15; the communication circuit 12 is used for communicating with the adjustable direct current source 2 and/or the battery pack 3 with the communication band; the communication circuit 12 is electrically connected with the singlechip 15.

In some embodiments, as shown in fig. 2, the driving circuit 14 is composed of NPN transistors Q1, Q3, PNP transistors Q2, Q4, and a plurality of resistor-capacitor devices; when the IO port ARM_CHG of the singlechip 15 is set high, the triode Q3 is conducted, the voltage drop on the resistor R103 is larger than 0.7V, the resistor Q4 is conducted, and the voltage of the CHG is output to be 10V through the partial pressure of R105 and R106; when the IO port ARM_CHG of the singlechip 15 is set low, the triodes Q3 and Q4 are cut off, and the CHG voltage output is 0V; when the IO port ARM_DCHG of the singlechip 15 is set high, the triodes Q1 and Q2 are conducted, and the DCHG voltage output is 10V; when the IO port ARM_DCHG of the singlechip 15 is set low, the triodes Q1 and Q2 are cut off, and the DCHG voltage output is 0V.

In some embodiments, as shown in fig. 3, the current direction switching circuit 13 is composed of 8N-MOS circuits; when CHG is high and DCHG is low, N-MOS1, N-MOS2, N-MOS5 and N-MOS6 are on, N-MOS3, N-MOS4, N-MOS7 and N-MOS8 are off, current flows from the positive electrode of the adjustable direct current source 2 with communication, passes through N-MOS5, N-MOS6 to B-, passes through the switch MOS of BMS31 (refer to figure 1), and then goes to P-, back to N-MOS1 and N-MOS2 through the sampling resistor 312, and finally goes back to the negative electrode of the adjustable direct current source 2 with communication; compared with the BMS31, the current is charged from B-to P-, and at the moment, the singlechip 15 controls the current of the direct-current power supply and informs the BMS31, so that the calibration of the charging current can be completed; similarly, when CHG is low and DCHG is high, the current is discharged from P-to B-, and at this time, the singlechip 15 controls the current of the dc power supply and notifies the BMS31, so that calibration of the discharge current can be completed.

The model of the singlechip 15 is STM32F103CBT6, the BMS31 control chip is STM32F103CBT6, and the AFE front end acquisition chip is SH367309.

Referring to fig. 1, a calibration system for calibrating a sampling current of a BMS31 includes a calibration control board 1, an adjustable dc source 2 with communication, a battery pack 3 and the BMS31;

The adjustable direct current source 2 with the communication function is electrically connected with the battery pack 3 through the calibration control board 1;

The BMS31 is disposed between P-and B-of the battery pack 3;

The calibration control board 1 communicates with the band-pass adjustable direct current source 2 and the BMS31, respectively.

The adjustable direct current source 2 with communication is an adjustable direct current source 2 with communication of an adjustable communication circuit, and the BMS31 is also provided with a communication circuit.

The control chip of the BMS31 is STM32F103CBT6.

The BMS31 further includes a MOS switch 311 and a sampling resistor 312;

The MOS switch 311 and the sampling resistor 312 are electrically connected to the control chip, respectively.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims (8)

1. The BMS sampling current calibration control board is characterized by comprising a current direction switching circuit, a driving circuit and a singlechip;

The current direction switching circuit is used for switching the current direction between the direct current source and the battery pack;

The current direction switching circuit is electrically connected with the singlechip through the driving circuit;

The current direction switching circuit consists of 8N-MOS;

When CHG is high and DCHG is low, N-MOS1, N-MOS2, N-MOS5 and N-MOS6 are on, N-MOS3, N-MOS4, N-MOS7 and N-MOS8 are off, current flows out from the positive electrode of the direct current source, passes through N-MOS5, N-MOS6 to B-, passes through the switch MOS of the BMS, and the sampling resistor returns to P-, and returns to N-MOS1 and N-MOS2, and finally returns to the negative electrode of the direct current source; when CHG is low and DCHG is high, the current discharges from P-to B-;

The driving circuit consists of NPN triodes Q1 and Q3, PNP triodes Q2 and Q4 and a plurality of resistor-capacitor parts;

When the IO port ARM_CHG of the singlechip is set high, the triode Q3 is conducted, the voltage drop on the resistor R103 is larger than 0.7V, the resistor Q4 is conducted, and the voltage of the CHG is output to be 10V through the partial pressure of R105 and R106; when the IO port ARM_CHG of the singlechip is set low, the triodes Q3 and Q4 are cut off, and the voltage output of the CHG is 0V; when the IO port ARM_DCHG of the singlechip is set high, the triodes Q1 and Q2 are conducted, and the voltage output of the DCHG is 10V; when the IO port ARM_DCHG of the singlechip is set low, the triodes Q1 and Q2 are cut off, and the DCHG voltage output is 0V

Wherein, B-refers to the negative electrode of the battery in the battery pack, and P-refers to the negative electrode of the battery pack.

2. The calibration control board of claim 1, further comprising a power module;

The power module is electrically connected with the single chip.

3. The calibration control board of claim 1, further comprising a communication circuit for communicating with a direct current source and/or a battery pack;

The communication circuit is electrically connected with the single chip.

4. The calibration control board of claim 1, wherein the single chip microcomputer model number is STM32F103CBT6.

5. A calibration system for calibrating BMS sampling current, comprising the calibration control board of any of claims 1-4, a direct current source, and a battery pack; wherein the battery pack includes a BMS;

the direct current source is electrically connected with the battery pack through the calibration control board;

the BMS is disposed between P-and B-of the battery pack;

The calibration control board communicates with the direct current source and the BMS, respectively.

6. The calibration system of claim 5, wherein the direct current source is an adjustable direct current source with a communication circuit.

7. The calibration system of claim 5, wherein the control chip of the BMS is STM32F103CBT6.

8. The calibration system of claim 7, wherein the BMS further comprises a MOS switch and a sampling resistor;

And the MOS switch and the sampling resistor are respectively and electrically connected with the control chip.