CN212765830U

CN212765830U - Battery management system control circuit and charge-discharge system

Info

Publication number: CN212765830U
Application number: CN202021400682.2U
Authority: CN
Inventors: 杨磊; 郭智渊
Original assignee: Shanghai Junzheng Network Technology Co Ltd
Current assignee: Shanghai Junzheng Network Technology Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-03-23
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a battery management system control circuit and charge-discharge system belongs to electronic circuit technical field, can generate and transmit the activation signal that makes the power supply line output operating voltage in the BMS through simple circuit structure. The battery management system control circuit comprises a control module, a power module and an activation module respectively connected with the power module and the control module. The activation module includes a first capacitor, a second capacitor, a first diode, and a second diode. The first end of the first capacitor is connected with a power transmission interface, the second end of the first capacitor is connected with the first end of the first diode and the second end of the second diode, the second end of the first diode is respectively connected with the control module, the first end of the second capacitor and the enabling end of the power module, the first end of the second diode is grounded, and the second end of the second capacitor is grounded.

Description

Battery management system control circuit and charge-discharge system

Technical Field

The utility model relates to an electronic circuit technical field especially relates to a battery management system control circuit and charge-discharge system.

Background

At present, lithium ion batteries are applied in many fields such as electric tools and electric bicycles. As the application field of lithium ion batteries is more and more extensive, people also put higher demands on a lithium ion Battery Management System (BMS). Because the number of modules contained in the battery pack is large, the BMS has high power consumption, the electric quantity of the lithium battery pack is limited, and if the battery pack cannot be charged in time after being undervoltage, the battery cell can be dead and scrapped by the BMS, so that the great economic loss is caused. Usually, the designer will use the power control circuit to disconnect the power supply from the battery to the BMS when the battery is under-voltage, and activate the BMS when the battery is plugged into the charger.

However, the circuit structure of the activation circuit in the prior art is usually complicated, such as adding a mechanical key, which is inconvenient to use. Accordingly, those skilled in the art have made efforts to develop a circuit and a charge and discharge system that can generate and transmit an activation signal with a simple circuit configuration.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to generate and transmit an activation signal for causing a power supply line in a BMS to output an operating voltage through a simple circuit structure.

In order to achieve the above object, the present invention provides a battery management system control circuit, which comprises a control module, a power module and an activation module respectively connected to the power module and the control module. The activation module includes a first capacitor, a second capacitor, a first diode, and a second diode. The first end of the first capacitor is connected with a power transmission interface, the second end of the first capacitor is connected with the first end of the first diode and the second end of the second diode, the second end of the first diode is respectively connected with the control module, the first end of the second capacitor and the enabling end of the power module, the first end of the second diode is grounded, and the second end of the second capacitor is grounded.

The present invention provides a battery management system, which comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected to the second end of the first diode, the second end of the first resistor is connected to the first end of the control module, the first end of the second capacitor, the enable end of the power module and the first end of the second resistor, and the second end of the second resistor is grounded.

In a preferred embodiment of the present invention, the battery management system control circuit further includes a third diode, the control module is connected to the first end of the third diode, and the second end of the third diode is connected to the second end of the first diode.

In a preferred embodiment of the present invention, the battery management system control circuit further includes a third resistor, the control module is connected to the first end of the third resistor, and the second end of the third resistor is connected to the first end of the third diode.

In a preferred embodiment of the present invention, the power module includes a power chip having an enable terminal.

In a preferred embodiment of the present invention, the power chip may be at least one of the following: a DC-to-DC conversion chip and a low dropout linear regulator chip.

The utility model discloses an among the preferred embodiment, consumer or charger pass through the public end of plug-in components and are connected with the female end of this battery charge-discharge interface, the positive terminal of charge-discharge and the short circuit of activation terminal of the public end of plug-in components.

The utility model also provides a battery charge-discharge system, include as above arbitrary the battery management system control circuit.

The utility model provides a battery management system control circuit and battery charge and discharge system, this battery management system control circuit include control module, power module and connect this power module and this control module's activation module respectively. The activation module includes a first capacitor, a second capacitor, a first diode, and a second diode. The first end of the first capacitor is connected with a power transmission interface, the second end of the first capacitor is connected with the first end of the first diode and the second end of the second diode, the second end of the first diode is respectively connected with the control module, the first end of the second capacitor and the enabling end of the power module, the first end of the second diode is grounded, and the second end of the second capacitor is grounded. According to the scheme, when the electric equipment or the charger is connected to the battery pack, the voltage of the battery pack or the voltage of the charger can generate an activation signal after passing through the activation module, the activation signal can enable the power supply module to maintain voltage output for a period of time, the output voltage can enable the control module to be temporarily in a working state, and then the control module in the working state can monitor the cell voltage of the battery pack and output different signals according to a monitoring result. Therefore, the utility model discloses can generate and transmit activation signal to power module through simple circuit structure to make the different signal of control module output, and then realize the control to battery management system outage and activation.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is one of circuit diagrams of a battery management system control circuit provided by the present invention;

fig. 2 is a schematic diagram of the interface connection between the battery pack and the electric device or the charger provided by the present invention;

fig. 3 is a second circuit diagram of a battery management system control circuit according to the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In order to facilitate clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and actions. For example, the first capacitor and the second capacitor are only used for distinguishing different capacitors, and the sequence order of the capacitors is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

Some exemplary embodiments of the invention have been described for illustrative purposes, and it is to be understood that the invention may be practiced otherwise than as specifically described.

As shown in fig. 1, the utility model provides a battery management system control circuit and charge-discharge system, this battery management system control circuit can be applied to this charge-discharge system. The battery management system control circuit may include a control module 100, a power module 200, and an activation module 300 connected to the power module 200 and the control module 100, respectively. The battery charging and discharging system includes, but is not limited to, charging and discharging systems in mobile devices such as electric vehicles, power-assisted vehicles, electric automobiles and the like.

As shown in fig. 2, the electric device or the charger may be connected to the female terminal of the charging/discharging interface of the battery pack through the male terminal of the plug, and the charging/discharging positive terminal of the male terminal of the plug is short-circuited to the active terminal.

When the electric device is connected to the charging/discharging interface of the battery pack or the charger is connected to the charging/discharging interface of the battery pack, the voltage of the battery pack or the voltage of the charger is connected to the activation module 300 through the D port to generate an activation signal. The activation signal may maintain the power module 200 at a voltage output for a period of time, during which the voltage output by the power module 200 may cause the control module 100 to be in an operational state. Then, the control module 100 in the working state may monitor the cell voltage of the battery pack, and output a first signal to the power module 200 when detecting that the cell voltage is in a preset voltage range, where the first signal may be a high level; or when it is detected that the cell voltage is not in the preset voltage range, outputting a second signal to the power module 200, where the second signal may be a low level. In the case where the control module 100 outputs the first signal to the power module 200, the power module 200 may continue to maintain the continuous output of the voltage; in the case where the control module 100 outputs the second signal to the power module 200, the power module 200 may turn off the voltage output, thereby powering off the battery management system.

It should be noted that the preset voltage range refers to a normal operating voltage range of the cell voltage, that is, a voltage range in which the cell voltage is in a non-undervoltage state.

In particular, with continued reference to fig. 1, the activation module 300 may include a first capacitor C1, a second capacitor C2, a first diode D1, and a second diode D2. A first end of the first capacitor C1 is connected to a power transmission interface, a second end of the first capacitor C1 is connected to a first end of the first diode D1 and a second end of the second diode D2, a second end of the first diode D1 is connected to the control module 100, a first end of the second capacitor C2 and an enable end of the power module 200, a first end of the second diode D2 is grounded, and a second end of the second capacitor C2 is grounded. The first capacitor C1 is an isolation capacitor, and can be used for transmitting the charge and discharge positive voltage of the battery pack or the charger voltage at the moment when the electric equipment or the charger is connected to the battery pack, and isolating the charge and discharge positive voltage of the battery pack after the electric equipment or the charger is connected to the battery pack. The first diode D1 may be used to isolate the negative voltage generated after the voltage is transmitted through the first capacitor C1, so as to prevent damage to the power chips in the power module 200. The second diode D2 may be used to discharge the charge accumulated on the first capacitor C1 in preparation for the next generation of a positive pulse. The second capacitor C2 is an energy storage capacitor, and can be used for storing the energy transferred by the first capacitor C1 to maintain the voltage output for a period of time.

Optionally, the first diode D1 and the second diode D2 may also be a combined diode.

It should be noted that the control module 100 includes a control chip MCU and peripheral devices thereof, and the power module 200 includes a power chip and peripheral devices thereof. The power supply chip may be a power supply chip having an enable terminal.

It should be noted that, the first signal and the second signal output by the control module 100 are both from an I/O port of an MCU in the control module 100, the MCU may monitor a cell voltage, when the cell voltage is within a preset voltage range, the MCU may output a high level to continuously output the power module 200, when the cell voltage is not within the preset voltage range, the MCU may output a low level to pull down an enable control pin (EN) of a power chip in the power module 200 to turn off the output of the power module 200, because the power module 200 may output a voltage required for the MCU to operate, after the enable control pin (EN) is pulled down, the battery management system is powered off, and the control module 100 stops operating.

Optionally, the power chip may include at least one of: a direct current to direct current conversion chip (DC/DC chip) and a low dropout linear regulator chip (LDO chip). The DC/DC chip has high conversion efficiency and wide input voltage range. The LDO chip has good stability, fast load response and small output ripple. For example, the DC/DC chip may be SYB511 and the LDO chip may be SGM 2036.

Illustratively, the power chip includes a DC/DC chip and an LDO. As shown in fig. 3 (a), the port B is the positive electrode of the 13-string battery pack, the port P + is the charge-discharge positive electrode of the battery pack, and the port B and the port P + form two power sources of the DC/DC chip, the battery pack can supply power to the DC/DC chip U1 in the power module 200, and the charger or the electric device can also be connected to the port P + to supply power to the DC/DC chip U1 in the power module. The output port (VDD port) of the DC/DC chip U1 may output a 5V output voltage, where the 5V output voltage may be used as an input voltage of the LDO chip U2 shown in (b) in fig. 3, and then the output port (Vo port) of the LDO chip U2 may output a 3.3V output voltage, where the 3.3V output voltage may supply POWER to the control chip U3 shown in (c) in fig. 3, and the control chip U3 may be connected to the first terminal of the third resistor R3 through the interface POWER _ EN, so that the control chip U3 may detect the cell voltage of the battery pack.

In particular, with continued reference to fig. 3 (a), the activation module 300 of the battery management system control circuit may further include a first resistor R1 and a second resistor R2. A first end of the first resistor R1 is connected to the second end of the first diode D1, a second end of the first resistor R2 is connected to the control module 100, the first end of the second capacitor C2, the enable end of the DC/DC chip U1 and the first end of the second resistor R2, respectively, and a second end of the second resistor R2 is grounded. The control module 100 of the battery management system control circuit may further include a third resistor R3 and a third diode D3. The control module 100 is connected to a first terminal of the third resistor R3, and a second terminal of the third resistor R3 is connected to a first terminal of the third diode D3. The third resistor R3 may be used to limit current and the third diode D3 may be used to isolate damage to the I/O port of the control module 100 caused by the activation signal.

The utility model provides a battery management system control circuit and charge-discharge system, when consumer or charger insert the battery package, can generate an activation signal after battery package voltage or charger voltage pass through the activation module, this activation signal can make power module maintain the voltage output of a period, the voltage of output can make control module temporarily be in operating condition, afterwards, the control module who is in operating condition can monitor the electric core voltage of battery package, and export different signals according to the control result. Therefore, the utility model discloses can generate and transmit activation signal to power module through simple circuit structure to make the different signal of control module output, and then realize the control to battery management system outage and activation.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A battery management system control circuit is characterized by comprising a control module, a power supply module and an activation module which is respectively connected with the power supply module and the control module; the activation module comprises a first capacitor, a second capacitor, a first diode and a second diode; the first end of the first capacitor is connected with a power transmission interface, the second end of the first capacitor is connected with the first end of the first diode and the second end of the second diode, the second end of the first diode is respectively connected with the control module, the first end of the second capacitor and the enabling end of the power module, the first end of the second diode is grounded, and the second end of the second capacitor is grounded.

2. The battery management system control circuit of claim 1, further comprising a first resistor and a second resistor, wherein a first terminal of the first resistor is connected to the second terminal of the first diode, a second terminal of the first resistor is connected to the control module, a first terminal of the second capacitor, an enable terminal of the power module, and a first terminal of the second resistor, respectively, and a second terminal of the second resistor is connected to ground.

3. The battery management system control circuit of claim 1 or 2, further comprising a third diode, the control module being coupled to a first terminal of the third diode, a second terminal of the third diode being coupled to a second terminal of the first diode.

4. The battery management system control circuit of claim 3, further comprising a third resistor, wherein the control module is coupled to a first terminal of the third resistor, and wherein a second terminal of the third resistor is coupled to a first terminal of the third diode.

5. The battery management system control circuit according to claim 1 or 2, wherein the power supply module includes a power supply chip having an enable terminal.

6. The battery management system control circuit of claim 5, wherein the power chip is at least one of: a DC-to-DC conversion chip and a low dropout linear regulator chip.

7. The battery management system control circuit according to claim 1 or 2, wherein the electric device or the charger is connected with the female terminal of the battery charge-discharge interface through a male terminal of a plug-in unit, and a charge-discharge positive terminal of the male terminal of the plug-in unit is in short circuit with the activation terminal.

8. A battery charging/discharging system comprising the battery management system control circuit according to any one of claims 1 to 7.