CN219627398U - Battery recharging control circuit, battery pack and energy storage power supply - Google Patents

Battery recharging control circuit, battery pack and energy storage power supply Download PDF

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Publication number
CN219627398U
CN219627398U CN202320457352.4U CN202320457352U CN219627398U CN 219627398 U CN219627398 U CN 219627398U CN 202320457352 U CN202320457352 U CN 202320457352U CN 219627398 U CN219627398 U CN 219627398U
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China
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module
battery
battery pack
recharging
control circuit
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CN202320457352.4U
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陈龙扣
桂登宇
黄鹏
原亮亮
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Shenzhen Baseus Technology Co Ltd
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Shenzhen Baseus Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model discloses a battery recharging control circuit, a battery pack and a BMS protection board, wherein the battery recharging control circuit comprises: the first module, the second module and the third module are connected in series; the first module is used for triggering the second module to be in a disabled state under the condition that the control end of the first module receives a first control signal; and triggering the second module to be in an enabling state under the condition that the control end receives a second control signal; the second module is used for switching on or switching off a recharging loop of the battery; and the third module is used for limiting the magnitude of the recharging current of the battery.

Description

Battery recharging control circuit, battery pack and energy storage power supply
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a battery recharging control circuit, a battery pack and an energy storage power supply.
Background
When the battery pack voltage is lower than the minimum input voltage of the battery management system (BMS, battery Management System), the BMS system will stop operating, at which time the battery pack cannot be charged through the BMS system. In this case, the general processing method is a return repair, which is costly, inconvenient to operate, and poor in user experience.
Disclosure of Invention
In view of the above, the embodiment of the utility model provides a battery recharging control circuit, a battery pack and an energy storage power supply, so as to at least solve the problem that the lithium battery cannot be recharged due to overdischarge.
The technical scheme of the embodiment of the utility model is realized as follows:
the embodiment of the utility model provides a battery recharging control circuit, which comprises: the first module, the second module and the third module are connected in series; wherein,,
the first module is used for triggering the second module to be in a deactivated state under the condition that the control end of the first module receives a first control signal; and triggering the second module to be in an enabling state under the condition that the control end receives a second control signal;
the second module is used for switching on or switching off a recharging loop of the battery;
and the third module is used for limiting the magnitude of the recharging current of the battery.
In the above scheme, the first module includes a first MOS transistor, a first resistor, and a second resistor; wherein,,
one end of the first resistor is a control end of the first module, the other end of the first resistor is connected with the second resistor and the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the second module, and the other end of the second resistor and the source electrode of the first MOS tube are used for being connected with the negative electrode of the charger.
In the above scheme, the second module includes a second MOS transistor and a third resistor; wherein,,
the grid electrode of the second MOS tube and one end of the third resistor are connected to the first module in a sharing mode, the other end of the third resistor and the drain electrode of the second MOS tube are connected to the third module in a sharing mode, and the source electrode of the second MOS tube is used for being connected with the negative electrode of the charger.
In the above scheme, the third module comprises a fourth resistor or at least two fourth resistors connected in parallel.
The embodiment of the utility model also provides a battery pack, which comprises: a Battery Management System (BMS) unit and a battery pack unit connected in series; the BMS unit comprises a micro control unit (MCU, microcontroller Unit) module, a charge and discharge control module and any battery recharging control circuit which are connected in series; the MCU module is also connected with the battery recharging control circuit.
In the above scheme, the charge-discharge control module comprises a charge module and a discharge module which are connected in series; the charging module comprises at least one MOS tube, and the discharging module comprises at least one MOS tube;
the discharging module is used for accessing the battery recharging control circuit through a body diode of the MOS tube under the condition that the voltage of the battery pack is smaller than the first voltage; the first voltage characterizes a minimum input voltage of a BMS system in the battery pack.
In the above scheme, the MCU module is configured to:
and under the condition that the voltage of the battery pack is greater than or equal to the first voltage, the charging module and the discharging module are conducted, and a second control signal is output to the battery recharging control circuit.
In the above scheme, the MCU module is further configured to:
outputting a first control signal to the battery recharging control circuit under the condition that the voltage of the battery pack is larger than a first set threshold value; the first set threshold is greater than the first voltage.
In the above scheme, the positive electrode of the battery pack is used for connecting with the positive electrode of the charger; the negative electrode of the battery pack is used for being connected with the negative electrode of the charger; the charger is any one of the following:
-an energy storage bi-directional converter (PCS, power Conversion System);
universal serial bus (USB, universal Serial Bus) dc power supply.
The embodiment of the utility model also provides an energy storage power supply, which comprises any battery pack.
In the scheme of the embodiment of the utility model, the battery recharging control circuit comprises a first module, a second module and a third module which are connected in series; the first module is used for triggering the second module to be in a deactivated state under the condition that the control end of the first module receives a first control signal; and triggering the second module to be in an enabling state under the condition that the control end receives the second control signal; the second module is used for switching on or switching off a recharging loop of the battery; and a third module for limiting the magnitude of the recharging flow of the battery. Based on the scheme provided by the embodiment of the utility model, the first module starts the second module under the condition that the control end of the first module receives the second control signal, and the recharging loop of the battery is conducted, so that the voltage of the battery is raised, and the problem that the lithium battery cannot be charged due to overdischarge is solved.
Drawings
Fig. 1 is a schematic structural diagram of a battery recharging control circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a battery recharging control circuit according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a battery pack according to an embodiment of the present utility model;
FIG. 4 is a system block diagram of an energy storage over-discharge low-voltage recharging scheme provided by an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a charge-discharge control module according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a direction of a recharging flow according to an embodiment of the present utility model;
fig. 7 is a program flow chart of an energy storage over-discharge low-voltage recharging scheme provided by an application embodiment of the utility model.
Detailed Description
In recent years, new energy products based on lithium ion batteries (lithium batteries for short) are rapidly developed, and battery management systems are required in places where lithium batteries are available. In an actual application scene, because the battery pack of the electric tool battery-changing system, the electric friction battery-changing system and the outdoor energy storage system is self-powered and over-discharged by the BMS, the PCS and the uninterruptible power supply (UPS, uninterruptible Power Supply), when the voltage of the battery pack is lower than the minimum input voltage of the BMS, the BMS stops working, and the battery pack cannot be charged through the BMS at the moment.
Based on the above, the embodiment of the utility model provides a battery recharging control circuit, a battery pack and a BMS protection board. In the scheme of the embodiment of the utility model, the battery recharging control circuit comprises a first module, a second module and a third module which are connected in series; the first module is used for triggering the second module to be in a deactivated state under the condition that the control end of the first module receives a first control signal; and triggering the second module to be in an enabling state under the condition that the control end receives the second control signal; the second module is used for switching on or switching off a recharging loop of the battery; and a third module for limiting the magnitude of the recharging flow of the battery. Based on the scheme provided by the embodiment of the utility model, the first module starts the second module under the condition that the control end of the first module receives the second control signal, and the recharging loop of the battery is conducted, so that the voltage of the battery is raised, and the problem that the lithium battery cannot be charged due to overdischarge is solved.
The utility model will be described in further detail with reference to the accompanying drawings and specific examples.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.
The embodiment of the utility model provides a battery recharging control circuit, as shown in fig. 1, comprising: the first module 11, the second module 12 and the third module 13 are connected in series; wherein,,
the first module 11 is configured to trigger the second module 12 to be in a deactivated state when the control end of the first module 11 receives a first control signal; and triggering the second module 12 to be in an enabled state if the control terminal receives a second control signal;
the second module 12 is configured to switch on or off a recharging circuit of the battery;
the third module 13 is configured to limit the magnitude of the recharging current of the battery.
Here, the first control signal is a high level signal, and the second control signal is a low level signal.
Here, the second module 12 is in a deactivated state for disconnecting the recharging circuit of the battery; the second module 12 is in an active state for conducting a recharging circuit of the battery. When the recharging circuit of the battery is conducted, the battery can be recharged by the charger, and the voltage of the battery can continuously rise.
The third module 13 is used for limiting the magnitude of the recharging current of the battery so as to prevent the battery from being damaged due to excessive recharging current.
In the embodiment of the utility model, the first module 11 enables the second module 12 under the condition that the control end of the first module 11 receives the low-level signal, and the recharging loop of the battery is conducted, so that the voltage of the battery is raised, and the problem that the lithium battery cannot be charged due to overdischarge is solved.
In an embodiment, the first module 11 includes a first MOS transistor, a first resistor, and a second resistor; wherein,,
one end of the first resistor is a control end of the first module 11, the other end of the first resistor is connected with the second resistor and the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the second module 12, and the other end of the second resistor and the source electrode of the first MOS tube are used for being connected with the negative electrode of the charger.
In the embodiment of the utility model, the MOS transistor is an N-type metal-oxide semiconductor field effect transistor (NMOS transistor for short), the NMOS transistor is turned on when a high-level signal is input to the grid electrode of the NMOS transistor, and the NMOS transistor is turned off when a low-level signal is input to the grid electrode of the NMOS transistor.
As shown in fig. 2, when the control end (one end of R1) of the first module 11 receives a high level signal, the first MOS transistor Q1 is turned on; when the control end of the first module 11 receives the low level signal, the first MOS transistor Q1 is turned off.
In one embodiment, the second module 12 includes a second MOS transistor and a third resistor; wherein,,
the grid electrode of the second MOS tube and one end of the third resistor are connected to the first module 11 in a sharing mode, the other end of the third resistor and the drain electrode of the second MOS tube are connected to the third module 13 in a sharing mode, and the source electrode of the second MOS tube is used for being connected with the negative electrode of the charger.
Here, as shown in fig. 2, the third resistor R3 is used for current limiting. When the charger is connected, under the condition that the first MOS tube Q1 is conducted, the grid electrode of the second MOS tube Q2 is connected to the negative electrode of the charger, the second MOS tube Q2 is cut off, and the recharging loop of the battery is disconnected; under the condition that the first MOS tube Q1 is cut off, the grid electrode of the second MOS tube Q2 is connected to the drain electrode of the first MOS tube Q1, under the condition that the drain electrode of the second MOS tube Q2 receives a high-level signal, the second MOS tube Q2 is conducted, and the recharging loop of the battery is conducted.
In an embodiment, the third module 13 comprises a fourth resistor or at least two fourth resistors connected in parallel.
The embodiment of the utility model also provides a battery pack, as shown in fig. 3, comprising: a series-connected BMS unit 31 and battery unit 32; the BMS unit 31 includes an MCU module 311, a charge/discharge control module 312, and any battery recharging control circuit 313 connected in series; the MCU module 311 is also connected with the battery recharging control circuit 313.
In one embodiment, the charge and discharge control module 312 includes a charge module and a discharge module connected in series; the charging module comprises at least one MOS tube, and the discharging module comprises at least one MOS tube;
the discharging module is used for accessing the battery recharging control circuit 313 through a body diode of the MOS tube under the condition that the voltage of the battery pack is smaller than the first voltage; the first voltage characterizes a minimum input voltage of a BMS system in the battery pack.
Here, the battery voltage refers to the voltage of the battery in the battery cell 32. The MOS tube in the charging module is called a charging MOS tube, and the MOS tube in the discharging module is called a discharging MOS tube.
In practical applications, the minimum input voltage of the BMS system in the battery pack may be understood as the minimum input voltage of a Direct Current (DC) power supply chip in the BMS system. When the voltage of the battery pack is smaller than the minimum input voltage of the DC power supply chip, the DC power supply chip does not work, the BMS system is powered down, MOS tubes in the charging module and the discharging module are cut off, at the moment (figure 2) the RCHG_CTRL pin is pulled down because of the power down of the BMS system, and the discharging module is connected into the battery recharging control circuit 313 through a body diode of the MOS tube.
In one embodiment, the MCU module 311 is configured to:
in the case where the battery pack voltage is greater than or equal to the first voltage, the charging module and the discharging module are turned on, and a second control signal is output to the battery recharging control circuit 313.
In the embodiment of the utility model, when the voltage of the battery pack is greater than or equal to the minimum input voltage of the DC power supply chip, the BMS system is powered on, the MCU module 311 conducts the charging module and the discharging module, the charging current of the battery is not limited any more, the battery is charged normally, and the recharging circuit of the battery can be kept in a conducting state. In practice, outputting a low signal to the battery recharging control circuit 313 may be achieved by pulling the RCHG_CTRL pin low.
In an embodiment, the MCU module 311 is further configured to:
outputting a first control signal to the battery recharging control circuit 313 when the battery pack voltage is greater than a first set threshold; the first set threshold is greater than the first voltage.
In the embodiment of the utility model, under the condition that the battery is normally charged, when the voltage of the battery pack is greater than the first set threshold value, the recharging loop of the battery is disconnected. The first set threshold may be set as required, for example, the first voltage is 8V, and the first set threshold may be 10V. In practice, outputting a high signal to the battery recharging control circuit 313 may be achieved by pulling the RCHG_CTRL pin high.
In one embodiment, the positive electrode of the battery pack is used for connecting with the positive electrode of a charger; the negative electrode of the battery pack is used for being connected with the negative electrode of the charger; the charger is any one of the following:
PCS；
USB DC power supply.
The embodiment of the utility model also provides an energy storage power supply, which comprises any battery pack.
The embodiment of the utility model provides a system block diagram of an energy storage over-discharge low-voltage recharging scheme, as shown in fig. 4. The recharging MOS control unit comprises a charging and discharging control module and a battery recharging control circuit. The schematic circuit diagram of the charge-discharge control module is shown in fig. 5, and the schematic circuit diagram of the battery recharging control circuit is shown in fig. 2. The embodiment of the utility model also provides a recharging flow direction schematic diagram, as shown in fig. 6. The embodiment of the utility model also provides a program flow chart of the energy storage over-discharge low-voltage recharging scheme, as shown in fig. 7. The specific scheme is as follows:
(1) BMS system power on status: when the input voltage (i.e., the battery voltage) of the DC power supply chip in the BMS system is greater than the minimum input voltage (e.g., 8V) of the DC power supply chip, the BMS system is powered on, and the MCU module (not shown in fig. 4) in the BMS system shields the recharging circuit by pulling up the rchg_ctrl pin, at this time, the BMS system can be charged and discharged normally, perform a protection alarm action, etc.
(2) BMS system power down status: when the voltage of the battery pack is smaller than the minimum input voltage (for example, 8V) of the DC power supply chip, the DC power supply chip does not work, the BMS system is powered down, a charging MOS tube and a discharging MOS tube in the charging and discharging control module are cut off, at the moment, the RCHG_CTRL pin is pulled down because of the power down of the BMS system, and the recharging circuit is started and waits for the access of a charger. Under the condition that the charger is connected, the discharging MOS tube is connected to the battery recharging control circuit through the body diode and the MIDLE node (endpoint).
(3) After the BMS system is powered down, the charger is connected in, and the low-voltage recharging is connected in state 1: after the output of the battery overdischarge DC power supply chip is stopped, the PCS in FIG. 4 is connected with 220V mains supply and then starts to rectify, the PCS_DC_OUT port outputs (for example, 22V) voltage, the current direction is C+ flows through B+, B-, (FIG. 5) discharge MOS tube diode and MIDLE node (end point), and the current limiting resistors R10-R14, Q2 and C-, form a recharging loop.
(4) After the BMS system is powered down, the charger is connected in, and the low-voltage recharging is connected in state 2: after the output of the battery overdischarge DC power supply chip stops, a USB direct current power supply in FIG. 4 is connected, a USB_DC_OUT port outputs (for example, 22V) voltage, the current direction is that C+ flows through B+, B-, (FIG. 5) discharge MOS tube diode, MIDLE, (FIG. 2) current limiting resistors R10-R14, Q2 and C-, and a recharging loop is formed.
(5) The charger is connected after the BMS system is powered down, and the low-voltage recharging state is that: the recharging loop is formed, the battery pack is continuously charged, the battery pack voltage continuously rises, when the battery voltage is greater than the minimum input voltage of 8V, the BMS system is powered on, the MCU module is executed according to the program flow chart of fig. 7, when the battery pack voltage rises to 8V, the charging MOS tube is conducted, the charging current is not limited any more, normal output charging is carried out, the recharging loop is disconnected after the battery pack voltage is greater than 10V, and low-voltage recharging is completed.
In the application embodiment of the utility model, a battery recharging control circuit serving as a recharging circuit and used for recharging and limiting current is added on the basis of a basic frame of the BMS protection board, an NMOS (N-channel metal oxide semiconductor) tube is used as an on-off control device, and an MCU (micro control unit) logic judgment and a circuit are combined with each other, so that the problem that a lithium battery in an energy storage or battery replacement system cannot be charged due to low voltage is solved, the service life of the equipment is prolonged, the safety of the equipment is improved, the circuit design is simple, the MCU logic is concise and efficient, the production cost is low, and the large-scale production is easy.
The technical schemes described in the embodiments of the present utility model may be arbitrarily combined without any collision.
In addition, in the embodiments of the present utility model, "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. A battery recharging control circuit, comprising: the first module, the second module and the third module are connected in series; wherein,,
the first module is used for triggering the second module to be in a deactivated state under the condition that the control end of the first module receives a first control signal; and triggering the second module to be in an enabling state under the condition that the control end receives a second control signal;
the second module is used for switching on or switching off a recharging loop of the battery;
and the third module is used for limiting the magnitude of the recharging current of the battery.
2. The battery recharging control circuit of claim 1, wherein the first module comprises a first MOS transistor, a first resistor, and a second resistor; wherein,,
one end of the first resistor is a control end of the first module, the other end of the first resistor is connected with the second resistor and the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the second module, and the other end of the second resistor and the source electrode of the first MOS tube are used for being connected with the negative electrode of the charger.
3. The battery recharging control circuit of claim 1 or 2, wherein the second module comprises a second MOS transistor and a third resistor; wherein,,
the grid electrode of the second MOS tube and one end of the third resistor are connected to the first module in a sharing mode, the other end of the third resistor and the drain electrode of the second MOS tube are connected to the third module in a sharing mode, and the source electrode of the second MOS tube is used for being connected with the negative electrode of the charger.
4. The battery recharging control circuit of claim 1, wherein the third module comprises a fourth resistor or at least two fourth resistors in parallel.
5. A battery pack, comprising: a Battery Management System (BMS) unit and a battery pack unit connected in series; the BMS unit comprises a micro control unit MCU module, a charge and discharge control module and a battery recharging control circuit according to any one of claims 1 to 4 which are connected in series; the MCU module is also connected with the battery recharging control circuit.
6. The battery pack of claim 5, wherein the charge and discharge control module comprises a charge module and a discharge module connected in series; the charging module comprises at least one MOS tube, and the discharging module comprises at least one MOS tube;
the discharging module is used for accessing the battery recharging control circuit through a body diode of the MOS tube under the condition that the voltage of the battery pack is smaller than the first voltage; the first voltage characterizes a minimum input voltage of a BMS system in the battery pack.
7. The battery pack of claim 6, wherein the MCU module is configured to:
and under the condition that the voltage of the battery pack is greater than or equal to the first voltage, the charging module and the discharging module are conducted, and a second control signal is output to the battery recharging control circuit.
8. The battery pack of claim 6 or 7, wherein the MCU module is further configured to:
outputting a first control signal to the battery recharging control circuit under the condition that the voltage of the battery pack is larger than a first set threshold value; the first set threshold is greater than the first voltage.
9. The battery pack of claim 5, wherein the positive electrode of the battery pack is used to connect to the positive electrode of a charger; the negative electrode of the battery pack is used for being connected with the negative electrode of the charger; the charger is any one of the following:
an energy storage bidirectional converter PCS;
universal serial bus USB dc power supply.
10. An energy storage power supply comprising a battery pack according to any one of claims 5 to 9.
CN202320457352.4U 2023-02-28 2023-02-28 Battery recharging control circuit, battery pack and energy storage power supply Active CN219627398U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320457352.4U CN219627398U (en) 2023-02-28 2023-02-28 Battery recharging control circuit, battery pack and energy storage power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320457352.4U CN219627398U (en) 2023-02-28 2023-02-28 Battery recharging control circuit, battery pack and energy storage power supply

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CN219627398U true CN219627398U (en) 2023-09-01

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