CN218966726U - Battery management system and electric automobile - Google Patents
Battery management system and electric automobile Download PDFInfo
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- CN218966726U CN218966726U CN202223598381.7U CN202223598381U CN218966726U CN 218966726 U CN218966726 U CN 218966726U CN 202223598381 U CN202223598381 U CN 202223598381U CN 218966726 U CN218966726 U CN 218966726U
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Abstract
The application provides a battery management system and an electric automobile. The system is provided with a battery cell sampling interface, a current sampling module, a switch module, a control module, a first trigger module and a signal holding module, wherein the battery cell sampling interface is connected with state parameters of a battery cell, the current sampling module collects loop current, and the switch module is arranged on a charge-discharge loop to control the on-off of the loop. The control module is respectively connected with the battery core sampling interface and the current sampling module, can generate a control signal according to the state parameters and the loop current, and can also provide a clock signal. The first trigger module generates a first trigger signal according to the control signal and the clock signal. The signal holding module generates a second trigger signal according to the control signal and the clock signal, and holds the second trigger signal when the control module fails, so that power supply management of the battery is realized, and the second trigger signal is held by the signal holding module when the control module fails, so that the power supply state of the battery is held, and the power supply reliability of the battery is improved.
Description
Technical Field
The embodiment of the utility model relates to an energy storage technology, in particular to a battery management system and an electric automobile.
Background
The power supply stability of the battery is an important factor affecting the safety of the electric automobile. In order to improve the power supply stability, battery management systems are designed on power supply batteries of electric automobiles. The battery management system can control the on-off of the charge-discharge loop according to the state parameters of the battery, and prevent safety accidents caused by abnormal battery states.
However, when the micro control unit in the battery management system fails, the conventional battery management system lacks a reasonable solution, so that the reliability of power supply of the battery is not high.
Disclosure of Invention
The utility model provides a battery management system and an electric automobile, which are used for improving the power supply reliability of a battery.
In a first aspect, an embodiment of the present utility model provides a battery management system, including:
the battery cell sampling interface is used for connecting each battery cell in the battery and accessing the state parameters of the battery cells;
the current sampling module is arranged on a charge-discharge loop of the battery and is used for collecting loop current of the battery;
the switch module is arranged on the charge-discharge loop of the battery and used for controlling the on-off of the charge-discharge loop of the battery;
the control module is respectively connected with the battery cell sampling interface and the current sampling module, and is used for providing a clock signal and generating a control signal according to the state parameters of the battery cell and the loop current of the battery;
the first trigger module is respectively connected with the switch module and the control module and is used for generating a first trigger signal according to the control signal and the clock signal so as to control the state of the switch module;
the signal holding module is respectively connected with the switch module and the control module and is used for generating a second trigger signal according to the control signal and the clock signal so as to control the state of the switch module and hold the second trigger signal when the control signal and the clock signal are interrupted.
Optionally, the control module is provided with a control signal end and a clock signal end;
the signal holding module comprises a second trigger and a third trigger, the second trigger is connected with the control module, the control end of the second trigger is connected with the control signal end, and the clock end of the second trigger is reversely connected with the clock signal end;
the control end of the third trigger is connected with the output end of the second trigger, the clock end of the third trigger is connected with the clock signal end, and the third trigger is used as the output end of the signal holding module to be connected with the switch module.
Optionally, the second flip-flop and the third flip-flop are both D flip-flops.
Optionally, the battery management system further includes a hard shutdown module, where the hard shutdown module is connected to the current sampling module and the control end of the third trigger, and is configured to generate a hard shutdown signal when the loop current of the battery exceeds a current threshold;
the third trigger is further configured to generate the second trigger signal including shutdown information according to the hard shutdown signal.
Optionally, the hard shutdown module includes: the input end of the operational amplification circuit is respectively connected with two ends of the current sampling module, the input end of the comparator circuit is connected with the output end of the operational amplification circuit, and the output end of the comparator circuit is connected with the control end of the third trigger.
Optionally, the control module includes a front end unit and a micro control unit, where the front end unit is connected to the current sampling module and the battery cell sampling interface, and is used to obtain a state parameter of the battery cell and a current parameter of a loop current of the battery, and perform an equalization operation on the battery cell according to the state parameter; the state parameters of the battery cells comprise the monomer voltage and the temperature of each battery cell;
the micro control unit is respectively connected with the front end unit, the signal holding module and the first trigger module, and is used for generating the control signal according to the state parameter of the battery cell and the current parameter of the loop current and also used for providing a clock signal.
Optionally, the switch module comprises a switch driving unit and a switch tube, and the switch tube is arranged between the positive electrode of the battery and the positive electrode of the charge-discharge interface and used for controlling the on-off of the charge-discharge loop; the switch driving unit is respectively connected with the control end of the switch tube, the first trigger module and the signal holding module and is used for generating driving signals according to the first trigger signal and the second trigger signal so as to drive the on-off state of the switch tube.
Optionally, the battery management system further comprises a communication module and a communication interface, wherein the communication module is respectively connected with the control module and the communication interface, and is used for transmitting information between the control module and the communication interface;
the communication interface is used for being externally connected with a master controller.
Optionally, the battery management system further comprises: the input end of the voltage stabilizing module is connected with the anode of the battery, the output end of the voltage stabilizing module is respectively connected with the control module, the first triggering module and the signal holding module, and the voltage stabilizing module is used for generating a first voltage stabilizing power supply according to the battery power supply and supplying power to the control module, the first triggering module and the signal holding module; the communication module is also connected with the anode of the battery, and is also used for generating a second stabilized voltage power supply according to the battery power supply to supply power for the general controller externally connected with the communication interface.
In a second aspect, an embodiment of the present utility model further provides an electric automobile, including: a battery and the battery management system of any of the first aspects, the battery being coupled to the battery management system.
The battery management system and the electric automobile are provided with a battery cell sampling interface, a current sampling module, a switch module, a control module, a first trigger module and a signal holding module, wherein the battery cell sampling interface can be connected with state parameters of a battery cell, the current sampling module can collect loop current of a battery charging and discharging loop, and the switch module is arranged on the charging and discharging loop to control on-off of the charging and discharging loop. The control module is respectively connected with the battery core sampling interface and the current sampling module, can generate a control signal according to the state parameters of the battery core and the loop current of the battery, and can also provide a clock signal. The first trigger module generates a first trigger signal according to the control signal and the clock signal to control the state of the switch module, the signal holding module generates a second trigger signal according to the control signal and the clock signal to control the state of the switch module, and the second trigger signal is held when the control signal and the clock signal are interrupted, so that the power supply management of the battery is realized, the second trigger signal is held by the signal holding module under the condition that the control module fails, the power supply state of the battery is kept, and the power supply reliability of the battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a signal holding module according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model;
fig. 6 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model;
fig. 7 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of an electric vehicle according to an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In order to solve the problems set forth in the background art, embodiments of the present utility model provide a battery management system. Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present utility model, and referring to fig. 1, a battery management system 100 includes: the device comprises a battery cell sampling interface 101, a current sampling module 102, a switching module 103, a control module 104, a first triggering module 105 and a signal holding module 106. The cell sampling interface 101 is used for connecting each cell in the battery and accessing the state parameters of the cell. The current sampling module 102 is disposed on a charge-discharge loop of the battery, and is configured to collect a loop current of the battery. The switch module 103 is disposed on the charge-discharge circuit of the battery, and is used for controlling the on-off of the charge-discharge circuit of the battery. The control module 104 is connected to the battery cell sampling interface 101 and the current sampling module 102, respectively, and the control module 104 is configured to provide a clock signal and generate a control signal according to a state parameter of the battery cell and a loop current of the battery. The first trigger module 105 is connected to the switch module 103 and the control module 104, and is configured to generate a first trigger signal according to the control signal and the clock signal, so as to control a state of the switch module 103. The signal holding module 106 is connected to the switch module 103 and the control module 104, and is configured to generate a second trigger signal according to the control signal and the clock signal, so as to control the state of the switch module 103, and hold the second trigger signal when the control signal and the clock signal are interrupted.
Specifically, the cell sampling interface 101 refers to a sampling interface component connected with each cell in the battery, and may collect state parameters of each cell in the battery, where the state parameters refer to physical parameters that may represent a power supply state of the cell, and exemplary state parameters may include a cell voltage and a temperature. The cell sampling interface 101 may include a voltage sampling interface, where the voltage sampling interface is connected with the positive and negative electrodes of each cell in the battery respectively to collect the cell voltage of the cell, and in addition, the sampling interface may further include a temperature sampling interface, where the temperature sampling interface may be connected with a temperature sensor disposed at the battery to collect the temperature of the cell.
The current sampling module 102 refers to a current measurement component connected in a charge-discharge loop of the battery, and may be connected between a negative electrode of the battery and a negative electrode of the charge-discharge interface to detect a loop current on the charge-discharge loop of the battery. Illustratively, the current sampling module 102 may include a shunt tube. In addition, the current sampling module 102 may also include a temperature sensor that may be disposed on the shunt to collect the temperature of the shunt.
The switch module 103 is a switch assembly disposed in a charge-discharge circuit of the battery, and can be connected between the positive electrode of the battery and the positive electrode of the charge-discharge interface to control the on-off of the charge-discharge circuit of the battery. Illustratively, the switch module 103 may include a field effect transistor. The control module 104 refers to a signal processing and analyzing device, and the control module 104 may obtain a state parameter, a loop current and a shunt tube temperature of each cell, generate a corresponding control signal according to the state parameter, the loop current parameter and the shunt tube temperature, and provide the control signal to the first trigger module 105 and the signal holding module 106. Illustratively, the control module 104 generates a high level control signal if the state parameters of the individual cells, the loop current, and the shunt temperature are all within normal ranges. And the control module 104 generates a low level control signal in the event that any of the state parameters of the individual cells, loop current, and shunt tube temperature are outside of normal ranges. In addition, the control module 104 also generates a clock signal to be provided to the first trigger module 105 and the signal holding module 106.
The first trigger module 105 is connected with the switch module 103 and the switch module 103 respectively, and the first trigger module 105 can be connected with a control signal and a clock signal. In the case where both the clock signal and the control signal are present, the first trigger module 105 may generate the first trigger signal according to the control signal to control the on-off state of the switch module 103. The signal holding module 106 is connected with the switch module 103 and the switch module 103 respectively, and the signal holding module 106 can be connected with a control signal and a clock signal. In the case where both the clock signal and the control signal are present, the signal holding module 106 may generate a second trigger signal according to the control signal to control the on-off state of the switch module 103.
For example, in the case where both the clock signal and the control signal are present, the second trigger signal generated by the signal holding module 106 and the first trigger signal generated by the first trigger module 105 may be kept the same to control the switching state of the switching module 103. When the control module 104 is reset due to unexpected failure, the control signal and the clock signal are both interrupted, and at this time, the first trigger module 105 fails, and the signal holding module 106 may hold the potential of the second trigger signal, so that the switch module 103 maintains the state before the control module 104 is reset. For example, the signal holding module 106 may include two D flip-flops, which form a master-slave D flip-flop, so as to output a second trigger signal unchanged under the condition of interrupting the clock signal, so as to control the state of the switch module 103 to be unchanged, prevent the power loss of the electric vehicle caused by the temporary failure of the control module 104, reduce the accident occurrence rate, and improve the safety of the electric vehicle.
The battery management system provided by the embodiment is provided with a battery cell sampling interface, a current sampling module, a switch module, a control module, a first trigger module and a signal holding module, wherein the battery cell sampling interface can be connected with state parameters of a battery cell, the current sampling module can collect loop current of a battery charging and discharging loop, and the switch module is arranged on the charging and discharging loop to control on-off of the charging and discharging loop. The control module is respectively connected with the battery core sampling interface and the current sampling module, can generate a control signal according to the state parameters of the battery core and the loop current of the battery, and can also provide a clock signal. The first trigger module generates a first trigger signal according to the control signal and the clock signal to control the state of the switch module, the signal holding module generates a second trigger signal according to the control signal and the clock signal to control the state of the switch module, and the second trigger signal is held when the control signal and the clock signal are interrupted, so that the power supply management of the battery is realized, the second trigger signal is held by the signal holding module under the condition that the control module fails, the power supply state of the battery is kept, and the power supply reliability of the battery is improved.
Optionally, fig. 2 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model, fig. 3 is a schematic structural diagram of a signal holding module according to an embodiment of the present utility model, and on the basis of the foregoing embodiment, in combination with fig. 2 and fig. 3, the control module 104 is provided with a control signal terminal a and a clock signal terminal b. The signal holding module 106 includes a second trigger 201 and a third trigger 202, the second trigger 201 is connected to the control module 104, a control end of the second trigger 201 is connected to the control signal end a, and a clock end of the second trigger 201 is reversely connected to the clock signal end b. The control terminal of the third flip-flop 202 is connected to the output terminal of the second flip-flop 201, the clock terminal of the third flip-flop 202 is connected to the clock signal terminal b, and the third flip-flop 202 is connected to the switch module 103 as the output terminal of the signal holding module 106.
Specifically, the control signal terminal a refers to a port on the control module 104 for outputting a control signal. The clock signal terminal b refers to a port on the control module 104 outputting a clock signal. The second flip-flop 201 and the third flip-flop 202 may both be D flip-flops. The connection mode of the second trigger 201 and the third trigger 202 is connected, so that the second trigger 201 and the third trigger 202 form a master-slave D trigger. The control end of the second trigger 201 is connected with the control signal end a, the clock end of the second trigger 201 is reversely connected with the clock signal end b, and the reverse connection is that the clock end of the second trigger 201 is accessed with the clock signal after the inversion.
For example, if the battery management system 100 is applied to a power battery of an electric vehicle. In the process of the electric automobile operation, the power battery continuously supplies power to the electric appliance connected with the charge-discharge interface, if no battery core fault and no charge-discharge loop fault exist, the control end of the control module 104 can continuously output a control signal with high potential, and the clock signal end b continuously outputs a clock signal. The first trigger module 105 may generate a first trigger signal of a high potential according to the control signal, and the second trigger module may also generate a second trigger signal of a high potential according to the control signal. Once the control module 104 fails and needs to be restarted, both the clock signal and the control signal are interrupted for a brief period of seconds during which the control module 104 is restarted. The first trigger module 105 fails, but the clock signal does not generate a rising edge in the restart period, so that the output end signal of the second trigger 201 is unchanged, and the third trigger 202 can keep outputting the high-level output signal before restarting the control module 104, so that the switch module 103 is kept in a conducting state, the power battery can keep supplying power before resetting the control module 104, the power interruption caused by the software fault is prevented, and the power supply reliability of the battery is improved.
Optionally, fig. 4 is a schematic structural diagram of still another battery management system according to an embodiment of the present utility model, and referring to fig. 4, based on the foregoing embodiment, the battery management system 100 further includes a hard shutdown module 301, where the hard shutdown module 301 is connected to the current sampling module 102 and the control terminal of the third trigger 202, respectively, and is configured to generate a hard shutdown signal when the loop current of the battery exceeds a current threshold. The third flip-flop 202 is further configured to generate a second trigger signal comprising the shutdown information according to the hard shutdown signal.
Specifically, the hard shutdown module 301 refers to a signal analysis processing circuit disposed between the current sampling module 102 and the third trigger 202, and may compare the loop current collected by the current sampling module 102 with a current threshold, and generate a hard shutdown signal when the loop current exceeds the current threshold. The hard shutdown module 301 may include an operational amplifier circuit 302 and a comparator circuit 303, where input ends of the operational amplifier circuit 302 are respectively connected to two ends of the current sampling module 102, and the operational amplifier circuit 302 is configured to perform operational amplification processing on a loop current signal collected by the current sampling module 102, so as to facilitate signal transmission. An input terminal of the comparator circuit 303 is connected to an output terminal of the operational amplifier circuit 302, and an output terminal of the comparator circuit 303 is connected to a control terminal of the third flip-flop 202. The comparator circuit 303 is also connected to a reference power supply and can obtain a current threshold value that is compared to the loop current. The comparator circuit 303 compares the processed loop current signal with a reference power supply, and generates an output signal according to the comparison result. In the case that the loop current exceeds the current threshold, the output signal generated by the comparison circuit is a hard off signal. In case the loop current exceeds the current threshold, the output signal generated by the comparison circuit may be identical to the output signal of the second flip-flop 201, and the hard-off signal may be a low potential signal, for example.
The battery management system provided by the embodiment is provided with the hard shutdown module, and the hard shutdown module is respectively connected with the current sampling module and the control end of the third trigger, so that a hard shutdown signal can be generated under the condition that the loop current of the battery exceeds a current threshold value. The third trigger is further used for generating a second trigger signal comprising shutdown information according to the hard shutdown signal, so that forced shutdown of the battery charging and discharging loop is realized, signal transmission of the hard shutdown module does not pass through the control module, signal failure caused by control module faults is avoided, the transmission speed is high and the cost is low by adopting the operational amplifier circuit and the comparison circuit, and the reliability of the battery management system is further improved.
Optionally, fig. 5 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model, and on the basis of the foregoing embodiment, referring to fig. 5, the control module 104 includes a front end unit 501 and a micro control unit 502, where the front end unit 501 is connected to the current sampling module 102 and the battery cell sampling interface 101, respectively, and is configured to obtain a state parameter of a battery cell and a current parameter of a loop current of the battery cell, and perform an equalization operation on the battery cell according to the state parameter; the state parameters of the battery cells comprise the single voltage and the temperature of each battery cell. The micro control unit 502 is connected to the front end unit 501, the signal holding module 106 and the first trigger module 105, respectively, and is configured to generate a control signal according to a state parameter of the battery cell and a current parameter of the loop current, and further configured to provide a clock signal.
Specifically, the front-end unit 501 refers to a front-end acquisition and equalization component of the battery, and the front-end unit 501 may be an AFE battery analog front-end acquisition chip, for example. The front end unit 501 may obtain a state parameter of the battery cell and a current parameter of a loop current of the battery, and further perform an equalization operation on each battery cell in the battery according to a cell voltage in the state parameter, where the front end unit 501 may implement the equalization operation on the battery cell through the battery cell sampling interface 101.
The micro control unit 502 is a control center of the battery management system 100, is connected to the front end unit 501, and can generate a control signal according to the state parameter of the battery core and the current parameter of the loop current of the battery acquired by the front end unit 501, and is also used for providing a clock signal. Illustratively, the micro-control unit 502 may be a micro-control chip. In addition, the micro control unit 502 can also be connected with the current sampling module 102102 to directly acquire the loop current of the battery, so that the data loss caused in the signal transmission process is reduced.
Optionally, fig. 6 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model, and on the basis of the foregoing embodiment, referring to fig. 6, the switch module 103 includes a switch driving unit 601 and a switch tube 602, where the switch tube 602 is disposed between a positive electrode of a battery and a positive electrode of a charge-discharge interface, and is used for controlling on-off of a charge-discharge loop; the switch driving unit 601 is respectively connected with the control end of the switching tube 602, the first trigger module 105 and the signal holding module 106, and is configured to generate a driving signal according to the first trigger signal and the second trigger signal, so as to drive the on-off state of the switching tube 602.
Specifically, the switch driving unit 601 refers to a driving circuit assembly that drives the switching tube 602 in a switching state according to the first trigger signal and/or the second trigger signal, where the switch driving unit 601 may be a signal amplifying circuit including an amplifying triode, and may be capable of providing a driving signal with a voltage level sufficiently large for the switching tube 602. The switching tube 602 may include a field effect tube, and the switch driving unit 601 may control on/off of the field effect tube, so as to implement on/off of the charge/discharge circuit.
Optionally, fig. 7 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model, and referring to fig. 7, based on the foregoing embodiment, the battery management system 100 further includes a communication module 701, a communication interface 702, and a voltage stabilizing module 703, where the communication module 701 is connected to the control module 104 and the communication interface 702, and the communication module 701 is used for information transmission between the control module 104 and the communication interface 702. The communication interface 702 is used to connect to the overall controller. The input end c of the voltage stabilizing module 703 is connected with the positive electrode of the battery, the output end d of the voltage stabilizing module 703 is respectively connected with the control module 104, the first triggering module 105 and the signal holding module 106, and the voltage stabilizing module 703 is used for generating a first voltage stabilizing power supply according to the battery power supply to supply power to the control module 104, the first triggering module 105 and the signal holding module 106; the communication module 701 is further connected to the positive electrode of the battery, and the communication module 701 is further configured to generate a second voltage-stabilized power supply according to the battery power supply, so as to supply power to the master controller externally connected to the communication interface 702.
Specifically, the communication module 701 has a communication function, and CAN realize communication signal transmission between the control module 104 and devices connected to the communication interface 702, where the communication module 701 may have a CAN communication function, and be connected to the communication interface 702 through a CAN communication line, where the communication interface 702 may be externally connected to a master controller, where the master controller may monitor battery related parameters such as an electric quantity of a battery, a state parameter of a battery core, an on-off state of a charge/discharge loop, and a loop current of the charge/discharge loop, and generate a master control signal according to an upper signal (which may be input by a user), so as to control on-off of the switch module 103 and a state of each module.
The voltage stabilizing module 703 may include a low dropout linear voltage regulator, an input terminal of the low dropout linear voltage regulator may be connected to an anode of the battery, and a power supply terminal of the low dropout linear voltage regulator may be connected to components such as the first trigger module 105, the second trigger 201, the third trigger 202, the micro control unit 502, the operational amplifier circuit 302, and the comparator circuit 303, respectively, so as to provide a stable first stabilized voltage power supply. In addition, the communication module 701 may also include a voltage stabilizer, which may convert the battery power into the power required by the overall controller, and supply power to the overall controller through the communication interface 702. The communication interface 702 may include a communication interface and a power supply interface, and the communication interface and the power supply interface may be integrated into the same interface.
The battery management system provided by the embodiment is further provided with a communication module, a communication interface and a voltage stabilizing module, wherein the communication interface can be externally connected with a master controller, the communication module is respectively connected with the communication interface and the control module, and communication connection between the master controller and the control module can be realized. The input end of the voltage stabilizing module is connected with the anode of the battery, so that the battery power supply can be converted into voltage grades required by each module, and power can be supplied to each module. The communication module is also connected with the anode of the battery, can convert the battery power supply into the power supply required by the master controller, and realizes the power supply for the master controller through the communication interface, so that the stable power supply in the battery management system is realized, the external power supply and the communication between the battery management system and the master controller are realized, the communication and the power supply connection between the battery management system and the master controller can enable the working state of the battery to be more suitable for the requirements of the electric automobile, the understanding of the user on the battery state is realized, and the power supply reliability of the battery is improved.
The embodiment of the utility model also provides an electric automobile. Fig. 8 is a schematic diagram of an electric vehicle according to an embodiment of the present utility model, and referring to fig. 8, an electric vehicle 800 includes a battery 801, a general controller 802, and the battery management system 100 according to any of the foregoing embodiments.
The battery management system and the electric automobile are provided with a battery cell sampling interface, a current sampling module, a switch module, a control module, a first trigger module and a signal holding module, wherein the battery cell sampling interface can be connected with state parameters of a battery cell, the current sampling module can collect loop current of a battery charging and discharging loop, and the switch module is arranged on the charging and discharging loop to control on-off of the charging and discharging loop. The control module is respectively connected with the battery core sampling interface and the current sampling module, can generate a control signal according to the state parameters of the battery core and the loop current of the battery, and can also provide a clock signal. The first trigger module generates a first trigger signal according to the control signal and the clock signal to control the state of the switch module, the signal holding module generates a second trigger signal according to the control signal and the clock signal to control the state of the switch module, and the second trigger signal is held when the control signal and the clock signal are interrupted, so that the power supply management of the battery is realized, the second trigger signal is held by the signal holding module under the condition that the control module fails, the power supply state of the battery is kept, and the power supply reliability of the battery is improved.
Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.
Claims (10)
1. A battery management system, comprising:
the battery cell sampling interface is used for connecting each battery cell in the battery and accessing the state parameters of the battery cells;
the current sampling module is arranged on a charge-discharge loop of the battery and is used for collecting loop current of the battery;
the switch module is arranged on the charge-discharge loop of the battery and used for controlling the on-off of the charge-discharge loop of the battery;
the control module is respectively connected with the battery cell sampling interface and the current sampling module, and is used for providing a clock signal and generating a control signal according to the state parameters of the battery cell and the loop current of the battery;
the first trigger module is respectively connected with the switch module and the control module and is used for generating a first trigger signal according to the control signal and the clock signal so as to control the state of the switch module;
the signal holding module is respectively connected with the switch module and the control module and is used for generating a second trigger signal according to the control signal and the clock signal so as to control the state of the switch module and hold the second trigger signal when the control signal and the clock signal are interrupted.
2. The battery management system of claim 1, wherein the control module is provided with a control signal terminal and a clock signal terminal;
the signal holding module comprises a second trigger and a third trigger, the second trigger is connected with the control module, the control end of the second trigger is connected with the control signal end, and the clock end of the second trigger is reversely connected with the clock signal end;
the control end of the third trigger is connected with the output end of the second trigger, the clock end of the third trigger is connected with the clock signal end, and the third trigger is used as the output end of the signal holding module to be connected with the switch module.
3. The battery management system of claim 2, wherein the second trigger and the third trigger are D-triggers.
4. The battery management system of claim 2, further comprising a hard shutdown module connected to the current sampling module and the control terminal of the third trigger, respectively, for generating a hard shutdown signal if the loop current of the battery exceeds a current threshold;
the third trigger is further configured to generate the second trigger signal including shutdown information according to the hard shutdown signal.
5. The battery management system of claim 4, wherein the hard shutdown module comprises: the input end of the operational amplification circuit is respectively connected with two ends of the current sampling module, the input end of the comparator circuit is connected with the output end of the operational amplification circuit, and the output end of the comparator circuit is connected with the control end of the third trigger.
6. The battery management system according to any one of claims 1 to 5, wherein the control module comprises a front end unit and a micro control unit, the front end unit is respectively connected with the current sampling module and the battery cell sampling interface, and is used for obtaining a state parameter of the battery cell and a current parameter of a loop current of the battery, and performing equalization operation on the battery cell according to the state parameter; the state parameters of the battery cells comprise the monomer voltage and the temperature of each battery cell;
the micro control unit is respectively connected with the front end unit, the signal holding module and the first trigger module, and is used for generating the control signal according to the state parameter of the battery cell and the current parameter of the loop current and also used for providing a clock signal.
7. The battery management system according to claim 6, wherein the switch module comprises a switch driving unit and a switch tube, and the switch tube is arranged between the positive electrode of the battery and the positive electrode of the charge-discharge interface, and is used for controlling the on-off of the charge-discharge loop; the switch driving unit is respectively connected with the control end of the switch tube, the first trigger module and the signal holding module and is used for generating driving signals according to the first trigger signal and the second trigger signal so as to drive the on-off state of the switch tube.
8. The battery management system of claim 6, further comprising a communication module and a communication interface, wherein the communication module is respectively connected with the control module and the communication interface, and the communication module is used for transmitting information between the control module and the communication interface;
the communication interface is used for being externally connected with a master controller.
9. The battery management system of claim 8, further comprising: the input end of the voltage stabilizing module is connected with the anode of the battery, the output end of the voltage stabilizing module is respectively connected with the control module, the first triggering module and the signal holding module, and the voltage stabilizing module is used for generating a first voltage stabilizing power supply according to the battery power supply and supplying power to the control module, the first triggering module and the signal holding module; the communication module is also connected with the anode of the battery, and is also used for generating a second stabilized voltage power supply according to the battery power supply to supply power for the general controller externally connected with the communication interface.
10. An electric automobile, characterized by comprising: a battery and the battery management system of any of claims 1-9, the battery being coupled to the battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223598381.7U CN218966726U (en) | 2022-12-30 | 2022-12-30 | Battery management system and electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223598381.7U CN218966726U (en) | 2022-12-30 | 2022-12-30 | Battery management system and electric automobile |
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| CN218966726U true CN218966726U (en) | 2023-05-05 |
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| CN202223598381.7U Active CN218966726U (en) | 2022-12-30 | 2022-12-30 | Battery management system and electric automobile |
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| CN (1) | CN218966726U (en) |
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