CN214929133U

CN214929133U - Voltage acquisition circuit and passive balanced acquisition board

Info

Publication number: CN214929133U
Application number: CN202120931533.7U
Authority: CN
Inventors: 陈建清; 张振沣; 吴中建; 胡友涛; 周奇聪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-11-30
Anticipated expiration: 2031-04-30

Abstract

The application provides a voltage acquisition circuit and passive balanced acquisition board. The voltage acquisition circuit comprises a first protection unit, a second protection unit and a control unit, wherein the first protection unit is provided with a first end and a second end, and the first end of the first protection unit is used for being connected with the positive electrode of the single battery; the first end of the filtering unit is electrically connected with the second end of the first protection unit, and the second end of the filtering unit is used for being electrically connected with the first pin of the single battery control chip; the first protection unit is provided with a first end and a second end, the first end of the second protection unit is used for being connected with the negative electrode of the battery cell, the second end of the second protection unit is used for being electrically connected with a second pin of the battery cell control chip, and the first protection unit and the second protection unit are at least used for enabling the voltage acquisition circuit not to be impacted by current. This scheme makes voltage acquisition circuit not receive the electric current and assaults to voltage acquisition circuit's stability has been strengthened.

Description

Voltage acquisition circuit and passive balanced acquisition board

Technical Field

The application relates to the field of new energy automobiles, in particular to a voltage acquisition circuit, a passive balance acquisition board, a fault diagnosis method and a fault diagnosis device of the passive balance acquisition board, a computer readable storage medium and a processor.

Background

At present, new energy automobile has all been equipped with BMS (battery management system), and the target is to carry out reasonable effectual management and control to the battery, furthest's the free uniformity of battery to ensure battery safety, extension battery life reduces the extra energy loss in the charge-discharge process simultaneously, and then improves whole car duration etc..

The BMS may be divided into three functional modules, i.e., a BCU (master control module), a BMU (battery information monitoring module), and an HVU (insulation monitoring module), according to functions, as shown in fig. 1. The utility model discloses in "passive balanced board of gathering" correspond to the battery information monitoring module in the BMS, the concrete functional module of board is gathered in passive equilibrium is shown in figure 2. The utility model discloses well passive balanced collection board is collection board for short.

The main functions of the acquisition board are to sample data such as voltage and temperature of each battery cell and current of the whole package, transmit the data to a BCU (main control module), and calculate and judge which battery cells need to be subjected to balance control by the BCU (main control module). If the cell balancing control method is needed, the BCU sends an instruction to the acquisition board, and the acquisition board performs balancing control on the corresponding battery cell. However, as the service life of the automobile is prolonged, the battery inevitably ages, the capacity of the battery is reduced, charging and discharging become rapid, and along with drastic power change during driving of the automobile or other environmental reasons, the function of the acquisition board may be interfered or damaged, and the working stability of the acquisition board is affected. The stability of the acquisition board is closely related to the performance of the voltage sampling circuit and the equalization circuit of the acquisition board.

SUMMERY OF THE UTILITY MODEL

The present application mainly aims to provide a voltage acquisition circuit, a passive equalization acquisition board, a fault diagnosis method for the passive equalization acquisition board, a diagnosis device, a computer-readable storage medium, and a processor, so as to solve the problem of poor working stability of the acquisition board in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a voltage acquisition circuit including: the first protection unit is provided with a first end and a second end, and the first end of the first protection unit is used for being connected with the positive electrode of the battery monomer; the first end of the filtering unit is electrically connected with the second end of the first protection unit, and the second end of the filtering unit is used for being electrically connected with a first pin of the single battery control chip; the first end of the second protection unit is used for being connected with the negative electrode of the battery cell, the second end of the second protection unit is used for being electrically connected with the second pin of the battery cell control chip, and the first protection unit and the second protection unit are at least used for enabling the voltage acquisition circuit not to be impacted by current.

Further, the first protection unit includes a first fuse, and the second protection unit includes a second fuse.

Further, the first protection unit further comprises a first high-frequency interference suppressor, the second protection unit further comprises a second high-frequency interference suppressor, the first fuse is connected in series with the first high-frequency interference suppressor, and the second fuse is connected in series with the second high-frequency interference suppressor.

Further, the first fuse is a first fuse, the second fuse is a second fuse, the first high-frequency interference suppressor is a first magnetic bead, and the second high-frequency interference suppressor is a second magnetic bead.

Further, the filtering unit comprises at least one filtering module, and the filtering module is composed of a capacitor and a resistor.

Furthermore, the number of the filter modules is two, the two filter modules are respectively a first filter module and a second filter module, the first filter module includes a first resistor and a first capacitor, the second filter module includes a second resistor and a second capacitor, the voltage acquisition circuit further includes a third capacitor and a third resistor, a first end of the first resistor and a first end of the first capacitor are respectively and electrically connected with a second end of the first protection unit, a second end of the first capacitor is grounded, a second end of the first resistor and a first end of the second capacitor are respectively and electrically connected with a first end of the second resistor, a second end of the second capacitor is grounded, a second end of the second resistor is respectively and electrically connected with the first pin and a first end of the third capacitor, a second end of the third capacitor is electrically connected with a second end of the second protection unit, and a first end of the third resistor is electrically connected with a second end of the first protection unit, and the second end of the third resistor is electrically connected with a third pin of the single battery control chip.

Furthermore, the circuit further comprises a voltage stabilizing unit, wherein the first end of the voltage stabilizing unit is electrically connected with the second end of the filtering unit, and the second end of the voltage stabilizing unit is grounded.

Further, the voltage stabilizing unit is a first voltage stabilizing diode.

According to another aspect of the application, a passive balanced acquisition board is provided, including balanced acquisition module of battery, MCU, SPI communication module and CAN communication module, the balanced acquisition module of battery include battery monomer control chip and arbitrary one the voltage acquisition circuit.

By applying the technical scheme, the first protection unit and the second protection unit are added into the voltage acquisition circuit for acquiring the voltage at the two ends of the battery cell, so that the voltage acquisition circuit is not impacted by current, and the stability of the voltage acquisition circuit is enhanced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

fig. 1 shows a block diagram of a BMS system in the prior art;

FIG. 2 shows a block diagram of a passive equalization acquisition board in the prior art;

fig. 3 shows a schematic diagram of a battery equalization acquisition module according to an embodiment of the present application.

Wherein the figures include the following reference numerals:

10. a first protection unit; 20. a filtering unit; 30. and a second protection unit.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

For convenience of description, some terms or expressions referred to in the embodiments of the present application are explained below:

magnetic beads: the device is used for suppressing high-frequency noise and spike interference on a signal line and a power line and has the capability of absorbing electrostatic pulses.

As introduced in the background art, the acquisition board in the prior art has poor working stability, and to solve the problem of poor working stability of the acquisition board, embodiments of the present application provide a voltage acquisition circuit, a passive equalization acquisition board, a fault diagnosis method for a passive equalization acquisition board, a diagnosis device, a computer-readable storage medium, and a processor.

An exemplary embodiment of the present application provides a voltage acquisition circuit, as shown in fig. 3, including:

a first protection unit 10 having a first end and a second end, the first end of the first protection unit being used for connecting the positive electrode of the battery cell;

a filter unit 20 having a first end and a second end, wherein the first end of the filter unit is electrically connected to the second end of the first protection unit, and the second end of the filter unit is electrically connected to the first pin of the battery cell control chip;

and a second protection unit 30 having a first end and a second end, wherein the first end of the second protection unit is used for connecting the negative electrode of the battery cell, the second end of the second protection unit is used for electrically connecting with the second pin of the battery cell control chip, and the first protection unit and the second protection unit are at least used for preventing the voltage acquisition circuit from current impact.

In the scheme, the first protection unit and the second protection unit are added into the voltage acquisition circuit for acquiring the voltages at the two ends of the battery cell, so that the voltage acquisition circuit is not impacted by current, and the stability of the voltage acquisition circuit is enhanced.

In one embodiment of the present application, the first protection unit includes a first fuse, and the second protection unit includes a second fuse. The fuse blows when the current in the circuit is too large, and plays a role in protecting the circuit.

In one embodiment of the present application, the first protection unit further includes a first high-frequency suppressor, the second protection unit further includes a second high-frequency suppressor, the first fuse is connected in series with the first high-frequency suppressor, and the second fuse is connected in series with the second high-frequency suppressor.

In one embodiment of the present invention, as shown in fig. 3, the first fuse is a first fuse F1, the second fuse is a second fuse F2, the first rf suppressor is a first bead L1, and the second rf suppressor is a second bead L2. The first fuse F1 and the second fuse F2 are used to prevent a surge of equalizing current.

In an embodiment of the present application, the filtering unit includes at least one filtering module, and the filtering module includes a capacitor and a resistor.

In an embodiment of the present application, as shown in fig. 3, there are two filter modules, which are a first filter module and a second filter module, respectively, the first filter module includes a first resistor R1 and a first capacitor C1, the second filter module includes a second resistor R2 and a second capacitor C2, the voltage acquisition circuit further includes a third capacitor C3 and a third resistor R3, a first end of the first resistor and a first end of the first capacitor are electrically connected to the second end of the first protection unit, a second end of the first capacitor is grounded, a second end of the first resistor and a first end of the second capacitor are electrically connected to the first end of the second resistor, a second end of the second capacitor is grounded, a second end of the second resistor is electrically connected to the first pin and a first end of the third capacitor, respectively, and a second end of the third capacitor is electrically connected to the second end of the second protection unit, the first end of the third resistor is electrically connected with the second end of the first protection unit, and the second end of the third resistor is electrically connected with the third pin of the single battery control chip. The first fuse F1 prevents the damage of the cell control chip caused by excessive equalizing current under special conditions. The first magnetic bead L1 and the first capacitor C1 form an inductance type filter, and low-frequency noise is effectively removed. The first resistor RI and the first capacitor C1 form an anti-aliasing low-pass filter to remove high-frequency interference. Two superpose filtering make battery control monomer sampling data more stable, second resistance R2 prevents effectively that the hot plug from damaging, third electric capacity C3 filtering common mode interference, first zener diode D1 prevents that sampling channel input voltage from surpassing battery monomer control chip pin allowed band, the A6 end of battery monomer control chip is inputed to the voltage that finally comes from the battery, behind internal difference module U6, follow-up circuit samples and handles the signal. The principle of the balance control is as follows: when the voltage across the Cell6 is higher, the equalization control is performed. The BCU sends a balance instruction, the passive balance acquisition board controls the conduction of the MOSFET tube G6 in the single battery control chip after receiving the instruction, and at the moment, the single battery Cell6, the first fuse F1, the first magnetic bead L1, the third resistor R3, the MOSFET tube G6, the second magnetic bead L2 and the second fuse F2 form a conduction loop. The third resistor R3 dissipates electrical energy and lowers the Cell6 voltage. And (5) completing the equalization. The Cell5 is consistent with the Cell 6.

In an embodiment of the present application, as shown in fig. 3, the voltage acquisition circuit further includes a fourth resistor R4, a fourth capacitor C4, a fifth resistor R5, a fifth capacitor C5, a sixth capacitor C6, and a second zener diode D2, the fourth resistor R4 and the fourth capacitor C4 form a filtering module, the fifth resistor R5 and the fifth capacitor C5 form a filtering module, and the second zener diode D2 functions to stabilize voltage. The first magnetic bead L1 and the original first capacitor C1 form a new filter circuit, and the second magnetic bead L2 and the original second capacitor C2 form a new filter circuit, so that the filtering capability is enhanced. The addition of the first zener diode D1 and the second zener diode D2 prevents sample voltage surges.

In an embodiment of the present application, the circuit further includes a voltage stabilizing unit, a first end of the voltage stabilizing unit is electrically connected to the second end of the filtering unit, and a second end of the voltage stabilizing unit is grounded. Specifically, the voltage stabilizing unit is a first voltage stabilizing diode.

In an alternative embodiment of the present application, as shown in fig. 3, the relative position between the first zener diode D1 and the third resistor R3 may be changed, and the first magnetic bead and the second magnetic bead may be replaced by inductors.

Another typical embodiment of this application provides a passive balanced board of gathering, including balanced collection module of battery, MCU, SPI communication module and CAN communication module, the balanced collection module of above-mentioned battery includes battery monomer control chip and the foretell voltage acquisition circuit of arbitrary one. Because the first protection unit and the second protection unit are added in the voltage acquisition circuit, the stability of the voltage acquisition circuit is enhanced, the stability of the battery equalization acquisition module is further enhanced, and the stability of the passive equalization acquisition board is further enhanced.

From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

1) the voltage acquisition circuit of this application through add first protection unit and second protection unit in the voltage acquisition circuit at the voltage at original collection battery monomer both ends for voltage acquisition circuit does not receive the electric current and strikes, thereby has strengthened voltage acquisition circuit's stability.

2) The passive balanced acquisition board has the advantages that the first protection unit and the second protection unit are added into the voltage acquisition circuit, so that the stability of the voltage acquisition circuit is enhanced, the stability of the battery balanced acquisition module is enhanced, and the stability of the passive balanced acquisition board is enhanced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A voltage acquisition circuit, comprising:

the first protection unit is provided with a first end and a second end, and the first end of the first protection unit is used for being connected with the positive electrode of the battery monomer;

the first end of the filtering unit is electrically connected with the second end of the first protection unit, and the second end of the filtering unit is used for being electrically connected with a first pin of the single battery control chip;

the first end of the second protection unit is used for being connected with the negative electrode of the battery cell, the second end of the second protection unit is used for being electrically connected with the second pin of the battery cell control chip, and the first protection unit and the second protection unit are at least used for enabling the voltage acquisition circuit not to be impacted by current.

2. The voltage acquisition circuit of claim 1, wherein the first protection unit comprises a first fuse and the second protection unit comprises a second fuse.

3. The voltage acquisition circuit of claim 2, wherein the first protection unit further comprises a first high frequency suppressor, the second protection unit further comprises a second high frequency suppressor, the first fuse is in series with the first high frequency suppressor, and the second fuse is in series with the second high frequency suppressor.

4. The voltage acquisition circuit of claim 3, wherein the first fuse is a first fuse, the second fuse is a second fuse, the first jammer is a first bead, and the second jammer is a second bead.

5. The voltage acquisition circuit of claim 1, wherein the filtering unit comprises at least one filtering module consisting of a capacitor and a resistor.

6. The voltage acquisition circuit according to claim 5, wherein there are two filter modules, which are a first filter module and a second filter module, respectively, the first filter module includes a first resistor and a first capacitor, the second filter module includes a second resistor and a second capacitor, the voltage acquisition circuit further includes a third capacitor and a third resistor, the first end of the first resistor and the first end of the first capacitor are electrically connected to the second end of the first protection unit, respectively, the second end of the first capacitor is grounded, the second end of the first resistor and the first end of the second capacitor are electrically connected to the first end of the second resistor, the second end of the second capacitor is grounded, the second end of the second resistor is electrically connected to the first pin and the first end of the third capacitor, respectively, and the second end of the third capacitor is electrically connected to the second end of the second protection unit, the first end of the third resistor is electrically connected with the second end of the first protection unit, and the second end of the third resistor is electrically connected with the third pin of the single battery control chip.

7. The voltage acquisition circuit of claim 1, further comprising a voltage stabilization unit, wherein a first terminal of the voltage stabilization unit is electrically connected to a second terminal of the filtering unit, and wherein a second terminal of the voltage stabilization unit is grounded.

8. The voltage acquisition circuit of claim 7, wherein the voltage regulation unit is a first voltage regulation diode.

9. A passive balanced acquisition board is characterized by comprising a battery balanced acquisition module, an MCU (microprogrammed control unit), an SPI (serial peripheral interface) communication module and a CAN (controller area network) communication module, wherein the battery balanced acquisition module comprises a single battery control chip and a voltage acquisition circuit as claimed in any one of claims 1 to 7.