CN218920042U - Battery management system - Google Patents

Battery management system Download PDF

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Publication number
CN218920042U
CN218920042U CN202223610849.XU CN202223610849U CN218920042U CN 218920042 U CN218920042 U CN 218920042U CN 202223610849 U CN202223610849 U CN 202223610849U CN 218920042 U CN218920042 U CN 218920042U
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module
switch
voltage
detection unit
output
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贺勇锋
谢捷明
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Guangzhou Liante Electronic Technology Co ltd
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Guangzhou Liante Electronic 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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Abstract

The utility model relates to a battery management system, which has the technical scheme that the system comprises: the step-up and step-down module is used for carrying out step-up/step-down on the input voltage to obtain a first working voltage; the first charging module is used for charging the first battery pack; the second charging module is used for charging the second battery pack; the step-down module is used for outputting a second working voltage; the first switch module is used for controlling whether the first battery pack discharges to the buck-boost module and the buck-boost module according to a first electric signal output by the controller; the second switch module is used for controlling whether the second battery pack discharges to the buck-boost module and the buck-boost module according to a second electric signal output by the controller; a voltage detection module; a current detection module; the charging management method has the advantages that the charging voltage of the corresponding battery packs can be adjusted according to the current of the two battery packs, the charging management of the two battery packs is achieved, when no input voltage is input, the two battery packs can be controlled to discharge, and the effect of keeping the working voltage in the power-off state is achieved.

Description

Battery management system
Technical Field
The present utility model relates to the field of battery management technology, and more particularly, to a battery management system.
Background
Currently, batteries are indispensable as an energy source for devices, both in mobile power supplies and in electronic devices having self-contained power supplies. The charging and discharging of these batteries requires a reasonable management circuit to control operation.
As disclosed in the publication No. CN109193882a, entitled charge-discharge management circuit and rechargeable battery, comprising: a charging circuit and a discharging circuit, and a battery management circuit for switching connection to the charging circuit and the discharging circuit; the discharging circuit comprises a DC-DC voltage stabilizing loop and a dynamic load loop which are connected in series; the charging circuit comprises a synchronous exchange type charging loop and a voltage reverse protection circuit which are connected in series; the rechargeable battery comprises a lithium battery, a metal shell connected with the negative electrode of the lithium battery and an insulating cap arranged on the positive electrode of the lithium battery; a control board is arranged in the cap, and a charge and discharge management circuit is arranged on the control board; the control panel is provided with conductive metal protrusions protruding from the cap, and the conductive metal protrusions are connected to the total connection point of the battery management loop. The beneficial effects of this application are that the rechargeable battery of lithium cell design can stabilize output 1.5V voltage, can high-efficient charge and can look over electric core electric quantity at any time LED, but, it is difficult to carry out charge and discharge management to two group batteries, also is difficult to adjust the charge voltage to the group battery according to the electric current size of group battery.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a battery management system which has the functional advantages that the charging voltage of the corresponding battery packs can be adjusted according to the current of the two battery packs, the charging management of the two battery packs is realized, when no input voltage is input, the two battery packs can be controlled to discharge, and the non-power-down state of the working voltage is maintained.
The technical aim of the utility model is realized by the following technical scheme:
a battery management system, comprising:
a controller; the step-up and step-down module is used for carrying out step-up/step-down on the input voltage to obtain a first working voltage; the first charging module is used for adjusting the first working voltage to charge the first battery pack; the second charging module is used for adjusting the first working voltage so as to charge a second battery pack; the step-down module is used for outputting a second working voltage; the first switch module is used for controlling whether the first battery pack discharges to the buck-boost module and the buck-boost module according to a first electric signal output by the controller; the second switch module is used for controlling whether the second battery pack discharges to the buck-boost module and the buck-boost module according to a second electric signal output by the controller; the voltage detection module is used for detecting the first working voltage, the second working voltage, the output voltage of the first battery pack and the output voltage of the second battery pack; the current detection module is used for detecting the output current of the buck-boost module, the output current of the buck module, the output current of the first battery pack and the output current of the second battery pack;
the input end of the buck-boost module and the input end of the buck-boost module are both used for connecting input voltage; the output end of the lifting pressure module is respectively connected with the first input end of the first charging module and the first input end of the second charging module; the output end of the first charging module and the first input end of the first switching module are both used for being connected with a first battery pack; the output end of the first switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the output end of the second charging module and the first input end of the second switching module are both used for connecting a second battery pack; the output end of the second switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the second input end of the first charging module, the second input end of the second charging module, the second input end of the first switching module, the second input end of the second switching module, the voltage detection module and the current detection module are all connected with the controller; the voltage detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module; the current detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module.
Optionally, the method further comprises: an auxiliary source module; the input end of the auxiliary source module is connected with the output end of the buck-boost module, and the first output end of the auxiliary source module is respectively connected with the first charging module and the second charging module; the voltage detection module and the current detection module are both connected with the auxiliary source module.
Optionally, the voltage detection module includes: a first voltage detection unit for detecting the first operating voltage, a second voltage detection unit for detecting the second operating voltage, a third voltage detection unit for detecting an output voltage of the first battery pack, and a fourth voltage detection unit for detecting an output voltage of the second battery pack; the input end of the first voltage detection unit is connected with the output end of the buck-boost module, and the first output end of the first voltage detection unit is connected with the controller; the input end of the second voltage detection unit is connected with the output end of the voltage reduction module, and the first output end of the second voltage detection unit is connected with the controller; the input end of the third voltage detection unit is used for being connected with the first battery pack, and the first output end of the third voltage detection unit is connected with the controller; the input end of the fourth voltage detection unit is used for being connected with the second battery pack, and the first output end of the fourth voltage detection unit is connected with the controller; the second output end of the first voltage detection unit, the second output end of the second voltage detection unit, the second output end of the third voltage detection unit and the second output end of the fourth voltage detection unit are all connected with the controller.
Optionally, the first voltage detection unit, the second voltage detection unit, the third voltage detection unit and the fourth voltage detection unit all adopt voltage detection circuits: the voltage detection circuit includes: the first resistor, the second resistor, the first capacitor, the first diode and the second diode; the first end of the first resistor is used as an input end of the voltage detection circuit, the second end of the first resistor is used as a first output end of the voltage detection circuit, the second end of the first resistor is grounded through the second resistor, the second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is connected with the anode of the first diode and the cathode of the second diode respectively; the cathode of the first diode is used as a second output end of the voltage detection circuit; the anode of the second diode is grounded.
Optionally, the current detection module includes: a first current detection unit for detecting an output current of the step-up/down module, a second current detection unit for detecting an output current of the step-down module, a third current detection unit for detecting an output current of the first battery pack, and a fourth current detection unit for detecting an output current of the second battery pack; the input end of the first current detection unit is connected with the output end of the buck-boost module, and the first output end of the first current detection unit is connected with the controller; the input end of the second current detection unit is connected with the output end of the voltage reduction module, and the first output end of the second current detection unit is connected with the controller; the input end of the third current detection unit is used for being connected with the first battery pack, and the first output end of the third current detection unit is connected with the controller; the input end of the fourth current detection unit is used for being connected with the second battery pack, and the first output end of the fourth current detection unit is connected with the controller; the second output end of the first current detection unit, the second output end of the second current detection unit, the second output end of the third current detection unit and the second output end of the fourth current detection unit are all connected with the controller.
Optionally, the method further comprises: a communication module; the input end of the communication module is connected with the second output end of the auxiliary source module, the first data receiving end and the first data transmitting end of the communication module are both connected with the controller, and the second data receiving end and the second data transmitting end of the communication module are both used for being connected with the upper computer.
Optionally, the first switch module includes: a first switch, a second switch, and a third diode; the control end of the first switch is used as a second input end of the first switch module, the first end of the first switch is connected with the control end of the second switch, and the second end of the first switch is grounded; the first end of the second switch is used as a first input end of the first switch module, and the second end of the second switch is connected with the anode of the third diode; the cathode of the third diode is used as the output end of the first switch module.
Optionally, the first switch is a first triode, the control end of the first switch is a base electrode of the first triode, the first end of the first switch is a collector electrode of the first triode, and the second end of the first switch is an emitter electrode of the first triode; the second switch is a first field effect transistor, the control end of the second switch is a grid electrode of the first field effect transistor, the first end of the second switch is a source electrode of the first field effect transistor, and the second end of the second switch is a drain electrode of the first field effect transistor.
Optionally, the second switch module includes: a third switch, a fourth switch, and a fourth diode; the control end of the third switch is used as a second input end of the second switch module, the first end of the third switch is connected with the control end of the fourth switch, and the second end of the third switch is grounded; the first end of the fourth switch is used as a first input end of the second switch module, and the second end of the fourth switch is connected with the anode of the fourth diode; the cathode of the fourth diode is used as the output end of the first switch module.
Optionally, the third switch is a second triode, the control end of the third switch is a base electrode of the second triode, the first end of the third switch is a collector electrode of the second triode, and the second end of the third switch is an emitter electrode of the second triode; the fourth switch is a second field effect transistor, the control end of the fourth switch is a grid electrode of the second field effect transistor, the first end of the fourth switch is a source electrode of the second field effect transistor, and the second end of the fourth switch is a drain electrode of the second field effect transistor.
In summary, the utility model has the following beneficial effects: the charging voltage of the corresponding battery packs can be adjusted according to the current of the two battery packs, so that charging management of the two battery packs is realized, when no input voltage is input, the controller controls the first switch module and the second switch module to be conducted, so that the first battery pack and the second battery pack discharge to the voltage boosting and reducing circuit and the voltage reducing circuit, the first working voltage and the second working voltage can be stably output, and the non-power-down state of the first working voltage and the second working voltage is kept.
Drawings
FIG. 1 is a partial connection block diagram of the present utility model;
FIG. 2 is a block diagram of the connection of a controller to other modules in the present utility model;
FIG. 3 is a block diagram of the connection of an auxiliary source module to other modules in the present utility model;
FIG. 4 is a schematic diagram of a voltage detection circuit according to the present utility model;
fig. 5 is a schematic circuit diagram of a first switch module and a second switch module according to the present utility model.
Detailed Description
In order that the objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The present utility model will be described in detail below with reference to the accompanying drawings and examples.
The present utility model provides a battery management system, as shown in fig. 1 and 2, comprising: a controller; the step-up and step-down module is used for carrying out step-up/step-down on the input voltage to obtain a first working voltage; the first charging module is used for adjusting the first working voltage to charge the first battery pack; the second charging module is used for adjusting the first working voltage so as to charge a second battery pack; the step-down module is used for outputting a second working voltage; the first switch module is used for controlling whether the first battery pack discharges to the buck-boost module and the buck-boost module according to a first electric signal output by the controller; the second switch module is used for controlling whether the second battery pack discharges to the buck-boost module and the buck-boost module according to a second electric signal output by the controller; the voltage detection module is used for detecting the first working voltage, the second working voltage, the output voltage of the first battery pack and the output voltage of the second battery pack; the current detection module is used for detecting the output current of the buck-boost module, the output current of the buck module, the output current of the first battery pack and the output current of the second battery pack;
the input end of the buck-boost module and the input end of the buck-boost module are both used for connecting input voltage; the output end of the lifting pressure module is respectively connected with the first input end of the first charging module and the first input end of the second charging module; the output end of the first charging module and the first input end of the first switching module are both used for being connected with a first battery pack; the output end of the first switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the output end of the second charging module and the first input end of the second switching module are both used for connecting a second battery pack; the output end of the second switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the second input end of the first charging module, the second input end of the second charging module, the second input end of the first switching module, the second input end of the second switching module, the voltage detection module and the current detection module are all connected with the controller; the voltage detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module; the current detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module.
In practical application, the input voltage is wide, the step-up and step-down module can adopt a SEPIC topology circuit in the prior art to step up or step down the input voltage to obtain a first working voltage, the step-down module can adopt a step-down circuit in the prior art, such as a step-down circuit formed by chips of MC33167T type, to step down the input voltage to obtain a second working voltage, the first charging module and the second charging module can both adopt the SEPIC topology circuit in the prior art, the controller controls the control end of the first charging module according to the output current of the first battery pack detected by the current detection module, so as to adjust the on time of the first charging switch of the first charging module, thereby realizing the adjustment of the output voltage of the first charging module, so that the output voltage of the first charging module meets the charging requirement of the first battery pack, the controller controls the control end of the second charging module according to the output current of the second battery pack detected by the current detection module, thereby realizing the adjustment of the output voltage of the second charging module according to the second battery pack, and the application of the second charging switch can be adjusted according to the requirements of the second battery pack, and the transistor can realize the adjustment of the on the charge voltage of the first battery pack; in the application, the wide voltage range is 20-30V, the first working voltage is 24V, the second working voltage is 12V, and in other embodiments, the proper input voltage can be selected according to the actual situation, and the proper first working voltage and the proper second working voltage can be selected and output; when no input voltage is input, the controller controls the first switch module and the second switch module to be conducted, so that the first battery pack and the second battery pack are discharged to the step-up and step-down circuit and the step-down circuit, the first working voltage and the second working voltage can be stably output, and the power-down state of the first working voltage and the second working voltage is maintained.
Further, as shown in fig. 3, the method further includes: an auxiliary source module; the input end of the auxiliary source module is connected with the output end of the buck-boost module, and the first output end of the auxiliary source module is respectively connected with the first charging module and the second charging module; the voltage detection module and the current detection module are both connected with the auxiliary source module.
In practical application, the first charging module and the second charging module further include: the pulse width modulation circuit adopts a chip with the model number TL494, the input end of the TL494 in the first charging module is respectively connected with the controller and the output voltage of the first charging module, the output end of the TL494 in the first charging module is connected with the control end of the SEPIC topology circuit in the first charging module to adjust the on time of the first charging switch so as to realize the feedback adjustment of the output voltage of the first charging module, the input end of the TL494 in the second charging module is respectively connected with the controller and the output voltage of the second charging module, the output end of the TL494 in the second charging module is connected with the control end of the SEPIC topology circuit in the second charging module so as to adjust the on time of the second charging switch so as to realize the feedback adjustment of the output voltage of the second charging module, the auxiliary source module can adopt a chip with the input end of the chip as the input end of the auxiliary source module, the output end of the chip is used as the first output end of the auxiliary source module, and the pulse width modulation circuit in the first charging module and the pulse width modulation circuit in the second charging module both use the output voltage of the first output end of the auxiliary source module as the reference voltage.
Further, as shown in fig. 1 to 3, the voltage detection module includes: a first voltage detection unit for detecting the first operating voltage, a second voltage detection unit for detecting the second operating voltage, a third voltage detection unit for detecting an output voltage of the first battery pack, and a fourth voltage detection unit for detecting an output voltage of the second battery pack; the input end of the first voltage detection unit is connected with the output end of the buck-boost module, and the first output end of the first voltage detection unit is connected with the controller; the input end of the second voltage detection unit is connected with the output end of the voltage reduction module, and the first output end of the second voltage detection unit is connected with the controller; the input end of the third voltage detection unit is used for being connected with the first battery pack, and the first output end of the third voltage detection unit is connected with the controller; the input end of the fourth voltage detection unit is used for being connected with the second battery pack, and the first output end of the fourth voltage detection unit is connected with the controller; the second output end of the first voltage detection unit, the second output end of the second voltage detection unit, the second output end of the third voltage detection unit and the second output end of the fourth voltage detection unit are all connected with the controller.
Specifically, the first voltage detecting unit can detect the first working voltage, that is, can detect the output voltage of the buck-boost module, the second voltage detecting unit can detect the second working voltage, that is, can detect the output voltage of the buck module, the third voltage detecting unit can detect the output voltage of the first battery pack, the fourth voltage detecting unit can detect the output voltage of the second battery pack, the first voltage detecting unit, the second voltage detecting unit, the third voltage detecting unit and the fourth voltage detecting unit can all transmit the detected voltages to the controller, under the condition that the first battery pack and the second battery pack are discharged, the controller can control the first switch module to cut off when the output voltage of the first battery pack is detected to be too low, the discharging of the first battery pack is cut off, the protection of the first battery pack is enhanced, and when the output voltage of the second battery pack is detected to be too low, the controller can control the second switch module to cut off, the discharging of the second battery pack is cut off, and the protection of the second battery pack is enhanced.
Further, as shown in fig. 4, the first voltage detection unit, the second voltage detection unit, the third voltage detection unit, and the fourth voltage detection unit all employ voltage detection circuits: the voltage detection circuit includes: the first resistor R1, the second resistor R2, the first capacitor C1, the first diode D1 and the second diode D2; the first end a of the first resistor R1 is used as an input end of the voltage detection circuit, the second end b of the first resistor R1 is used as a first output end of the voltage detection circuit, the second end of the first resistor R1 is grounded through the second resistor R2, the second end of the first resistor R1 is grounded through the first capacitor C1, and the second end of the first resistor R1 is connected with the anode of the first diode D1 and the cathode of the second diode D2 respectively; the cathode c of the first diode D1 is used as a second output end of the voltage detection circuit; the anode of the second diode D2 is grounded.
Specifically, in the case that the first voltage detection unit adopts the voltage detection circuit, the input end of the voltage detection circuit is the input end of the first voltage detection unit, the first output end of the voltage detection circuit is the first output end of the first voltage detection unit, and the second output end of the voltage detection circuit is the second output end of the first voltage detection unit; in the case that the second voltage detection unit adopts the voltage detection circuit, the input end of the voltage detection circuit is the input end of the second voltage detection unit, the first output end of the voltage detection circuit is the first output end of the second voltage detection unit, and the second output end of the voltage detection circuit is the second output end of the second voltage detection unit; in the case that the third voltage detection unit adopts the voltage detection circuit, the input end of the voltage detection circuit is the input end of the third voltage detection unit, the first output end of the voltage detection circuit is the first output end of the third voltage detection unit, and the second output end of the voltage detection circuit is the second output end of the third voltage detection unit; in the case that the fourth voltage detection unit adopts the voltage detection circuit, the input end of the voltage detection circuit is the input end of the fourth voltage detection unit, the first output end of the voltage detection circuit is the first output end of the fourth voltage detection unit, and the second output end of the voltage detection circuit is the second output end of the fourth voltage detection unit; by collecting the voltage of the second resistor R2, the controller can calculate the voltage of the input end of the voltage detection circuit, so as to obtain the voltage values of the first working voltage, the second working voltage, the output voltage of the first battery pack and the output voltage of the second battery pack.
Further, as shown in fig. 1 to 3, the current detection module includes: a first current detection unit for detecting an output current of the step-up/down module, a second current detection unit for detecting an output current of the step-down module, a third current detection unit for detecting an output current of the first battery pack, and a fourth current detection unit for detecting an output current of the second battery pack; the input end of the first current detection unit is connected with the output end of the buck-boost module, and the first output end of the first current detection unit is connected with the controller; the input end of the second current detection unit is connected with the output end of the voltage reduction module, and the first output end of the second current detection unit is connected with the controller; the input end of the third current detection unit is used for being connected with the first battery pack, and the first output end of the third current detection unit is connected with the controller; the input end of the fourth current detection unit is used for being connected with the second battery pack, and the first output end of the fourth current detection unit is connected with the controller; the second output end of the first current detection unit, the second output end of the second current detection unit, the second output end of the third current detection unit and the second output end of the fourth current detection unit are all connected with the controller.
In practical application, the first current detection unit, the second current detection unit, the third current detection unit and the fourth current detection unit may all adopt a current detection circuit formed by an operational amplifier of model LM358 in the prior art, so as to realize detection of the output current of the buck-boost module, the output current of the buck module, the output current of the first battery pack and the output current of the second battery pack, the detected output current of the buck module, the output current of the first battery pack and the output current of the second battery pack are delivered to the controller, when the output current of the first battery pack is less than 300mA, the controller may control the pulse width modulation circuit of the first charging module, when the output current of the first battery pack is less than 50mA, the controller may control the pulse width modulation circuit of the first charging module, when the output current of the second battery pack is less than 300mA, the controller may control the pulse width modulation circuit of the second charging module, and when the output voltage of the second charging module is adjusted to be less than 300mA, the second battery pack may control the pulse width modulation circuit of the second charging module.
Further, as shown in fig. 2, the method further includes: a communication module; the input end of the communication module is connected with the second output end of the auxiliary source module, the first data receiving end and the first data transmitting end of the communication module are both connected with the controller, and the second data receiving end and the second data transmitting end of the communication module are both used for being connected with the upper computer.
Specifically, in the application, the communication module adopts the RS232 communication module in the prior art, the second output end of the auxiliary source module is used for outputting the power supply voltage to the communication module, the first working voltage, the second working voltage, the output voltage of the first battery pack, the output voltage of the second battery pack, the output current of the buck-boost module, the output current of the buck module, the output current of the first battery pack and the output current of the second battery pack can be received by the first data receiving end, and then the second data sending end sends the values of the first working voltage, the second working voltage, the output voltage of the first battery pack, the output voltage of the second battery pack, the output current of the buck-boost module, the output current of the first battery pack and the output current of the second battery pack to the upper computer.
Further, as shown in fig. 5, the first switch module includes: a first switch, a second switch, and a third diode D3; the control end of the first switch is used as a second input end of the first switch module, the first end of the first switch is connected with the control end of the second switch, and the second end of the first switch is grounded; the first end of the second switch is used as a first input end of the first switch module, and the second end of the second switch is connected with the anode of the third diode D3; the cathode of the third diode D3 serves as the output of the first switching module.
In practical application, the control end of the first switch is connected with the controller, and the controller controls the on/off of the second switch by controlling the on/off of the first switch, so as to control whether the first battery pack discharges to the buck-boost module and/or the buck-boost module, and through the arrangement of the third diode D3, the current of the buck-boost module and the current of the buck module can be prevented from flowing into the first battery pack, and the protection effect is played on the first battery pack.
Further, as shown in fig. 5, the first switch is a first triode Q1, the control end of the first switch is the base electrode of the first triode Q1, the first end of the first switch is the collector electrode of the first triode Q1, and the second end of the first switch is the emitter electrode of the first triode Q1; the second switch is a first field effect transistor MOS1, the control end of the second switch is the grid electrode of the first field effect transistor MOS1, the first end of the second switch is the source electrode of the first field effect transistor MOS1, and the second end of the second switch is the drain electrode of the first field effect transistor MOS 1.
In practical application, under the condition that no wide voltage is used as an input voltage, namely under the condition that the first battery pack is not required to be charged, the controller controls the first triode Q1 to be conducted, so that the second field effect transistor MOS2 is controlled to be conducted, the first battery pack can output a first working voltage after passing through the buck-boost module, and the second working voltage is output after passing through the buck module, so that power supply to a load is realized.
Further, as shown in fig. 5, the second switch module includes: a third switch, a fourth switch, and a fourth diode D4; the control end of the third switch is used as a second input end of the second switch module, the first end of the third switch is connected with the control end of the fourth switch, and the second end of the third switch is grounded; the first end of the fourth switch is used as a first input end of the second switch module, and the second end of the fourth switch is connected with the anode of the fourth diode D4; the cathode of the fourth diode D4 serves as the output of the first switching module.
In practical application, the control end of the second switch is connected with the controller, and the controller controls the on/off of the fourth switch by controlling the on/off of the third switch, so as to control whether the second battery pack discharges to the buck-boost module and/or the buck-boost module, and through the arrangement of the fourth diode D4, the current of the buck-boost module and the current of the buck module can be prevented from flowing into the second battery pack, and the protection effect is played on the second battery pack.
Further, as shown in fig. 5, the third switch is a second triode Q2, the control end of the third switch is the base electrode of the second triode Q2, the first end of the third switch is the collector electrode of the second triode Q2, and the second end of the third switch is the emitter electrode of the second triode Q2; the fourth switch is a second field effect transistor MOS2, the control end of the fourth switch is a grid electrode of the second field effect transistor MOS2, the first end of the fourth switch is a source electrode of the second field effect transistor MOS2, and the second end of the fourth switch is a drain electrode of the second field effect transistor MOS 2.
In practical application, under the condition that no wide voltage is used as an input voltage, namely under the condition that the second battery pack is not required to be charged, the controller controls the second triode Q2 to be conducted, so that the second field effect transistor MOS2 is controlled to be conducted, the second battery pack can output a first working voltage after passing through the buck-boost module, and output a second working voltage after passing through the buck module, so that power supply to a load is realized.
According to the battery management system, the control end of the first charging module is controlled according to the output current of the first battery pack detected by the current detection module, so that the adjustment of the output voltage of the first charging module is realized, the output voltage of the first charging module accords with the charging requirement of the first battery pack, the control end of the second charging module is controlled according to the output current of the second battery pack detected by the current detection module, the adjustment of the output voltage of the second charging module is realized, the output voltage of the second charging module accords with the charging requirement of the second battery pack, the charging voltage of the battery pack can be adjusted according to the current of the battery pack, the charging management of the battery pack is realized, and when no input voltage is input, the controller controls the first switching module and the second switching module to be conducted, so that the first battery pack and the second battery pack are discharged to the step-up and step-down circuit, the first working voltage and the second working voltage can be stably output, and the non-power-down state of the first working voltage and the second working voltage is kept.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (10)

1. A battery management system, comprising:
a controller; the step-up and step-down module is used for carrying out step-up/step-down on the input voltage to obtain a first working voltage; the first charging module is used for adjusting the first working voltage to charge the first battery pack; the second charging module is used for adjusting the first working voltage so as to charge a second battery pack; the step-down module is used for outputting a second working voltage; the first switch module is used for controlling whether the first battery pack discharges to the buck-boost module and the buck-boost module according to a first electric signal output by the controller; the second switch module is used for controlling whether the second battery pack discharges to the buck-boost module and the buck-boost module according to a second electric signal output by the controller; the voltage detection module is used for detecting the first working voltage, the second working voltage, the output voltage of the first battery pack and the output voltage of the second battery pack; the current detection module is used for detecting the output current of the buck-boost module, the output current of the buck module, the output current of the first battery pack and the output current of the second battery pack;
the input end of the buck-boost module and the input end of the buck-boost module are both used for connecting input voltage; the output end of the lifting pressure module is respectively connected with the first input end of the first charging module and the first input end of the second charging module; the output end of the first charging module and the first input end of the first switching module are both used for being connected with a first battery pack; the output end of the first switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the output end of the second charging module and the first input end of the second switching module are both used for connecting a second battery pack; the output end of the second switch module is respectively connected with the input end of the buck-boost module and the input end of the buck-boost module; the second input end of the first charging module, the second input end of the second charging module, the second input end of the first switching module, the second input end of the second switching module, the voltage detection module and the current detection module are all connected with the controller; the voltage detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module; the current detection module is also respectively connected with the first battery pack, the second battery pack, the lifting pressure module and the voltage reduction module.
2. The battery management system of claim 1, further comprising: an auxiliary source module; the input end of the auxiliary source module is connected with the output end of the buck-boost module, and the first output end of the auxiliary source module is respectively connected with the first charging module and the second charging module; the voltage detection module and the current detection module are both connected with the auxiliary source module.
3. The battery management system of claim 2, wherein the voltage detection module comprises: a first voltage detection unit for detecting the first operating voltage, a second voltage detection unit for detecting the second operating voltage, a third voltage detection unit for detecting an output voltage of the first battery pack, and a fourth voltage detection unit for detecting an output voltage of the second battery pack; the input end of the first voltage detection unit is connected with the output end of the buck-boost module, and the first output end of the first voltage detection unit is connected with the controller; the input end of the second voltage detection unit is connected with the output end of the voltage reduction module, and the first output end of the second voltage detection unit is connected with the controller; the input end of the third voltage detection unit is used for being connected with the first battery pack, and the first output end of the third voltage detection unit is connected with the controller; the input end of the fourth voltage detection unit is used for being connected with the second battery pack, and the first output end of the fourth voltage detection unit is connected with the controller; the second output end of the first voltage detection unit, the second output end of the second voltage detection unit, the second output end of the third voltage detection unit and the second output end of the fourth voltage detection unit are all connected with the controller.
4. The battery management system of claim 3 wherein the first, second, third, and fourth voltage detection units each employ a voltage detection circuit: the voltage detection circuit includes: the first resistor, the second resistor, the first capacitor, the first diode and the second diode; the first end of the first resistor is used as an input end of the voltage detection circuit, the second end of the first resistor is used as a first output end of the voltage detection circuit, the second end of the first resistor is grounded through the second resistor, the second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is connected with the anode of the first diode and the cathode of the second diode respectively; the cathode of the first diode is used as a second output end of the voltage detection circuit; the anode of the second diode is grounded.
5. The battery management system of claim 2, wherein the current detection module comprises: a first current detection unit for detecting an output current of the step-up/down module, a second current detection unit for detecting an output current of the step-down module, a third current detection unit for detecting an output current of the first battery pack, and a fourth current detection unit for detecting an output current of the second battery pack; the input end of the first current detection unit is connected with the output end of the buck-boost module, and the first output end of the first current detection unit is connected with the controller; the input end of the second current detection unit is connected with the output end of the voltage reduction module, and the first output end of the second current detection unit is connected with the controller; the input end of the third current detection unit is used for being connected with the first battery pack, and the first output end of the third current detection unit is connected with the controller; the input end of the fourth current detection unit is used for being connected with the second battery pack, and the first output end of the fourth current detection unit is connected with the controller; the second output end of the first current detection unit, the second output end of the second current detection unit, the second output end of the third current detection unit and the second output end of the fourth current detection unit are all connected with the controller.
6. The battery management system of claim 2, further comprising: a communication module; the input end of the communication module is connected with the second output end of the auxiliary source module, the first data receiving end and the first data transmitting end of the communication module are both connected with the controller, and the second data receiving end and the second data transmitting end of the communication module are both used for being connected with the upper computer.
7. The battery management system of claim 1, wherein the first switch module comprises: a first switch, a second switch, and a third diode; the control end of the first switch is used as a second input end of the first switch module, the first end of the first switch is connected with the control end of the second switch, and the second end of the first switch is grounded; the first end of the second switch is used as a first input end of the first switch module, and the second end of the second switch is connected with the anode of the third diode; the cathode of the third diode is used as the output end of the first switch module.
8. The battery management system of claim 7, wherein the first switch is a first triode, the control terminal of the first switch is a base of the first triode, the first terminal of the first switch is a collector of the first triode, and the second terminal of the first switch is an emitter of the first triode; the second switch is a first field effect transistor, the control end of the second switch is a grid electrode of the first field effect transistor, the first end of the second switch is a source electrode of the first field effect transistor, and the second end of the second switch is a drain electrode of the first field effect transistor.
9. The battery management system of claim 1, wherein the second switch module comprises: a third switch, a fourth switch, and a fourth diode; the control end of the third switch is used as a second input end of the second switch module, the first end of the third switch is connected with the control end of the fourth switch, and the second end of the third switch is grounded; the first end of the fourth switch is used as a first input end of the second switch module, and the second end of the fourth switch is connected with the anode of the fourth diode; the cathode of the fourth diode is used as the output end of the first switch module.
10. The battery management system of claim 9, wherein the third switch is a second triode, the control terminal of the third switch is a base of the second triode, the first terminal of the third switch is a collector of the second triode, and the second terminal of the third switch is an emitter of the second triode; the fourth switch is a second field effect transistor, the control end of the fourth switch is a grid electrode of the second field effect transistor, the first end of the fourth switch is a source electrode of the second field effect transistor, and the second end of the fourth switch is a drain electrode of the second field effect transistor.
CN202223610849.XU 2022-12-30 2022-12-30 Battery management system Active CN218920042U (en)

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