CN107808985A - The protection device and method of a kind of battery management system - Google Patents
The protection device and method of a kind of battery management system Download PDFInfo
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- CN107808985A CN107808985A CN201711168496.3A CN201711168496A CN107808985A CN 107808985 A CN107808985 A CN 107808985A CN 201711168496 A CN201711168496 A CN 201711168496A CN 107808985 A CN107808985 A CN 107808985A
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- 238000005070 sampling Methods 0.000 claims abstract description 78
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
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- 238000007599 discharging Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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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- Electrochemistry (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present embodiments relate to technical field of battery management, the protection device and method of a kind of battery management system are disclosed.Wherein, the protection device includes：Total sampling module, for gathering the sampled voltage signal of battery management system and being converted to analog voltage signal；First control module, including AD conversion unit, for analog voltage signal to be converted into digital voltage value；First comparing unit, for compared with predetermined threshold value, digital voltage value to be exported into the first control signal；Second control module, including the second comparing unit, for compared with predetermined threshold value, analog voltage signal to be exported into the second control signal；Drive module, for according to the first control signal and the second control signal, output drive signal；Switch module, for being opened or closed according to drive signal, driving switch.By with upper type, it is possible to increase the security of battery management system, prevent overcharging or putting excessively for battery, extend the service life of battery.
Description
Technical Field
The invention relates to the field of battery management, in particular to a protection device and a protection method for a battery management system.
Background
Battery storage technology is an important technology for relieving the energy crisis and environmental pollution nowadays, and is receiving more and more attention. In the process of charging and discharging the battery, the consistency of each battery cell is reduced due to the change of the physical characteristics of the battery, such as the change of the polarization voltage and the internal resistance of the battery, so that the performance of the battery pack is deteriorated and even damaged, and the service life of the battery pack is greatly reduced. Under the background, a Battery Management System (BMS) is developed, which can detect the voltage, temperature, remaining capacity of the battery cells and the total voltage and total current of the battery pack during use, and can balance the voltage of each battery cell through energy transfer or dissipation, thereby prolonging the service life of the battery pack.
The inventor finds that, in the process of implementing the embodiment of the invention, the battery management system protection devices in the related art are implemented through software protection, so that the battery is easily overcharged or overdischarged due to system software failure, and the safety is low.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide a battery management system protection device and method that are highly safe and can improve the battery life.
In order to achieve the above purpose, the embodiment of the invention discloses the following technical scheme:
the invention provides a protection device of a battery management system, which comprises a total sampling module, a first control module, a second control module, a driving module and a switch module, wherein the total sampling module is used for collecting a sampling voltage signal of the battery management system and converting the sampling voltage signal into an analog voltage signal; the first control module includes: the analog-to-digital conversion unit is connected with the total sampling module and is used for converting the analog voltage signal into a digital voltage value; the first comparison unit is connected with the analog-to-digital conversion unit and used for comparing the digital voltage value with a preset threshold value and outputting a first control signal; the second control module includes: the second comparison unit is connected with the total sampling module and used for comparing the analog voltage signal with the preset threshold value and outputting a second control signal; the driving module is connected with the first control module and the second control module and used for outputting a driving signal according to the first control signal and the second control signal; the switch module is connected with the driving module and used for driving the switch to be turned on or turned off according to the driving signal.
In some embodiments, the total sampling module comprises: the sampling unit is used for sampling a voltage signal of the battery management system to obtain the sampled voltage signal; and the digital-to-analog conversion unit is connected with the sampling unit, converts the sampling voltage signal into an analog voltage signal, and sends the analog voltage signal to the first control module and the second control module.
In some embodiments, the total sampling module further comprises: the signal amplification unit is connected with the battery management system and used for amplifying a voltage signal of the battery management system; and the signal filtering unit is connected with the signal amplifying unit and the sampling unit, and is used for filtering the amplified voltage signal and sending the filtered voltage signal to the sampling unit.
In some embodiments, the preset threshold includes a preset overvoltage threshold, the first control signal includes a first overvoltage signal, the second control signal includes a second overvoltage signal, and the first comparing unit is specifically configured to: if the digital voltage value is larger than the preset overvoltage threshold value, outputting the first overvoltage signal; the second comparing unit is specifically configured to: and if the analog voltage signal is larger than the preset overvoltage threshold value, outputting the second overvoltage signal.
In some embodiments, the driving signal includes a turn-off charging driving signal, the switch includes a charging switch, and the driving module is specifically configured to: outputting the closing charging driving signal when the first overvoltage signal and/or the second overvoltage signal exist; the switch module is specifically configured to: and driving the charging switch to be closed according to the charging closing driving signal.
In some embodiments, the first control signal further includes a first no-over-voltage signal, the second control signal further includes a second no-over-voltage signal, and the first comparing unit is further configured to: if the digital voltage value is smaller than the preset overvoltage threshold value, outputting the first overvoltage-free signal; the second comparing unit is further configured to: and if the analog voltage signal is smaller than the preset overvoltage threshold value, outputting the second overvoltage-free signal.
In some embodiments, the drive signal comprises a further turn-on charge drive signal, the drive module is further configured to: outputting the opening charge driving signal when the first overvoltage signal and the second overvoltage signal are not over-voltage; the switch module is further configured to: and driving the charging switch to be switched on according to the switching-on charging driving signal.
In some embodiments, the preset threshold includes a preset under-voltage threshold, the first control signal includes a first under-voltage signal, the second control signal includes a second under-voltage signal, and the first comparing unit is specifically configured to: if the digital voltage value is smaller than the preset undervoltage threshold value, outputting the first undervoltage signal; the second comparing unit is specifically configured to: and if the analog voltage signal is smaller than the preset undervoltage threshold value, outputting the second undervoltage signal.
In some embodiments, the driving signal includes a turn-off discharge driving signal, the switch includes a discharge switch, and the driving module is specifically configured to: outputting the closing discharge driving signal when the first undervoltage signal and/or the second undervoltage signal exist; the switch module is specifically configured to: and driving the discharge switch to be closed according to the closing discharge driving signal.
In some embodiments, the first control signal further comprises a first not brownout signal, the second control signal further comprises a second not brownout signal,
the first comparison unit is further configured to: if the digital voltage value is larger than the preset undervoltage threshold value, outputting the first undervoltage-free signal; the second comparing unit is further configured to: and if the analog voltage signal is greater than the preset undervoltage threshold value, outputting the second undervoltage-free signal.
In some embodiments, the drive signal further comprises an open discharge drive signal, the drive module is further to: outputting the opening discharge driving signal when the first undervoltage signal and the second undervoltage signal exist; the switch module is further configured to: and driving the discharge switch to be opened according to the opening discharge driving signal.
The invention also provides a protection method of the battery management system, which is applied to the protection device and comprises the following steps: collecting a sampling voltage signal of a battery management system, and converting the sampling voltage signal into an analog voltage signal; converting the analog voltage signal into a digital voltage value, comparing the digital voltage value with a preset threshold value, and outputting a first control signal; comparing the analog voltage signal with the preset threshold value, and outputting a second control signal; outputting a driving signal according to the first control signal and the second control signal; and according to the driving signal, the driving switch is turned on or off.
The embodiment of the invention has the beneficial effects that: different from the prior art, the protection device for the battery management system provided by the embodiment of the invention comprises a total sampling module, a first control module, a second control module, a driving module and a switch module, wherein the total sampling module is used for collecting a sampling voltage signal of the battery management system and converting the sampling voltage signal into an analog voltage signal; the first control module includes: the analog-to-digital conversion unit is connected with the total sampling module and is used for converting the analog voltage signal into a digital voltage value; the first comparison unit is connected with the analog-to-digital conversion unit and used for comparing the digital voltage value with a preset threshold value and outputting a first control signal; the second control module includes: the second comparison unit is connected with the total sampling module and used for comparing the analog voltage signal with the preset threshold value and outputting a second control signal; the driving module is connected with the first control module and the second control module and used for outputting a driving signal according to the first control signal and the second control signal; the switch module is connected with the driving module and used for driving the switch to be turned on or turned off according to the driving signal. Through the way, the protection device of the battery management system in the embodiment can improve the safety of the battery management system in the using process, prevent explosion or permanent damage caused by overcharge or overdischarge of the battery, and prolong the service life of the battery.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a protection device of a battery management system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection device of a battery management system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protection device of a battery management system according to another embodiment of the present invention;
fig. 4 is a schematic flowchart illustrating a protection method of a battery management system according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a protection method of a battery management system according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating a protection method for a battery management system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a protection device and a protection method for a battery management system, which have high safety and can prolong the service life of a battery.
The protection device of the battery management system in the embodiment of the invention can be used as one of software or hardware functional units, independently arranged in the battery management system, or integrated into one functional module to execute the protection method of the battery management system in the embodiment of the invention.
In the embodiment of the invention, the battery management system can be a lithium battery management system, a storage battery management system and the like, and is mainly used for carrying out real-time monitoring, fault diagnosis, state of charge estimation, driving mileage estimation, short-circuit protection, electric leakage detection, display alarm and/or charge and discharge mode selection on battery parameters.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
Fig. 1 is a schematic structural diagram of a protection device of a battery management system according to an embodiment of the present invention. As shown in fig. 1, the protection device 100 of the battery management system of the present embodiment includes a total sampling module 10, a first control module 20, a second control module 30, a driving module 40, and a switching module 50.
The total sampling module 10 is configured to collect a sampling voltage signal of the battery management system, and convert the sampling voltage signal into an analog voltage signal. The sampling voltage signal is the total voltage of the battery pack in the battery management system, and the sampling voltage signal is a discrete digital signal. And converting the sampling voltage signal to obtain a continuous analog voltage signal.
The first control module 20 includes an analog-to-digital conversion unit 21 and a first comparison unit 22, where the analog-to-digital conversion unit 21 is connected to the total sampling module 10 and is configured to convert an analog voltage signal into a digital voltage value; the first comparing unit 22 is connected to the analog-to-digital converting unit 21, and configured to compare the digital voltage value with a preset threshold value, and output a first control signal. The analog-to-digital conversion unit 21 is an electronic component or a circuit structure that converts an analog signal into a digital signal. In the present embodiment, the analog-to-digital conversion unit 21 converts a continuous analog voltage signal into discrete digital voltage values by sample-hold and quantization coding. The first comparing unit 22 may be a micro-control unit (not shown), and the micro-control unit may include at least one processor and a memory, where the processor is a processor with certain logic operation capability, such as a single chip, a microprocessor, or a CPU, and the processor may further have one or more processing cores. The memory, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes the non-volatile software programs, instructions, and modules stored in the memory to perform: and comparing the digital voltage value with a preset threshold value, and outputting a first control signal. The first control signal may be a first overvoltage control signal, a first non-overvoltage signal, a first undervoltage signal or a first non-undervoltage signal; the preset threshold may be a preset overvoltage threshold or a preset undervoltage threshold, and the size of the threshold may be preset according to actual needs.
The second control module 30 includes a second comparing unit 31, and the second comparing unit 31 is connected to the total sampling module 10, and is configured to compare the analog voltage signal with a preset threshold value, and output a second control signal. Here, the second comparing unit 31 may be a voltage comparator circuit or the like, and the output second control signal is an analog signal. The second control signal may be a second over-voltage signal, a second non-over-voltage signal, a second under-voltage signal, or a second non-under-voltage signal.
The driving module 40 may be a motor driving circuit, a MOSFET driving circuit or a gate circuit, etc., and may be selected according to the user's needs. Preferably, the driving module 40 is an and circuit. The driving module 40 is connected to the first control module 21 and the second control module 31, and is configured to output a driving signal according to the first control signal and the second control signal. The driving signal may include a turn-off charging driving signal, a turn-on charging driving signal, a turn-off discharging driving signal, or a turn-on discharging driving signal.
The switching module 50 may be a logic gate circuit, a flip-flop circuit, or the like. The switch module 50 is connected to the driving module 40, and is configured to drive the switch to be turned on or off according to the driving signal. Wherein the switch comprises a charge switch and a discharge switch. When the charging switch is turned on, the battery management system charges, and when the discharging switch is turned on, the battery management system discharges.
In this embodiment, the total sampling module 10 collects a sampling voltage signal of the battery management system, and converts the sampling voltage signal into an analog voltage signal, the analog-to-digital conversion unit 21 in the first control module 20 converts the analog voltage signal into a digital voltage value, and sends the digital voltage value to the first comparison unit 22, the first comparison unit 22 compares the digital voltage value with a preset threshold value, and outputs a corresponding first control signal, and the second comparison unit 32 compares the analog voltage signal with the preset threshold value, and outputs a corresponding second control signal; the driving module 40 outputs a corresponding driving signal according to the first control signal and the second control signal, and the switching module 50 correspondingly performs the switching on or off of the driving switch according to the driving signal.
Alternatively, the above-mentioned total sampling module 10 may include a sampling unit 11 and a digital-to-analog conversion unit 12. The sampling unit 11 may be a circuit structure such as a data acquisition circuit, and is configured to sample a voltage signal of the battery management system to obtain a sampled voltage signal. The digital-to-analog conversion unit 12 may have a circuit structure including a weight resistor network, an operational amplifier, a reference power supply, and an analog switch, and the digital-to-analog conversion unit 12 is connected to the sampling unit 11, converts the sampled voltage signal into an analog voltage signal, and sends the analog voltage signal to the first control module 20 and the second control module 30.
Optionally, the total sampling module 10 may further include a signal amplifying unit 13 and a signal filtering unit 14. The signal amplifying unit 13 may be an amplifier circuit, and may be composed of a tube or a transistor, a power transformer, and other electrical components, and the signal amplifying unit 13 is connected to the battery management system for amplifying a voltage signal of the battery management system. The signal filtering unit 14 may be a filter circuit, and may be an active filter circuit or a passive filter circuit. The signal filtering unit 14 is connected to the signal amplifying unit 13 and the sampling unit 11, and configured to perform filtering processing on the amplified voltage signal and send the filtered voltage signal to the sampling unit 11.
The protection device 100 in this embodiment can improve the safety of the battery management system during the use process by providing two control units to realize dual protection, prevent explosion or permanent damage caused by overcharge or overdischarge of the battery due to system failure, and prolong the service life of the battery.
Example two
Fig. 2 is a schematic structural diagram of a protection device of a battery management system according to another embodiment of the present invention. As shown in fig. 2, the protection device 200 of the battery management system of the present embodiment includes a total sampling module 210, a first control module 220, a second control module 230, a driving module 240, and a switching module 250. In this embodiment, the battery management system is in a charging mode.
The total sampling module 210 is the same as the first embodiment, and is not described herein again.
The first control module 220 includes a digital-to-analog conversion unit 221 and a first comparison unit 222. The digital-to-analog conversion unit 221 is connected to the total sampling module 210, and is configured to convert the analog voltage signal sent by the total sampling module 210 into a digital voltage value. The first comparing unit 222 is configured to compare the digital voltage value with a preset threshold, and output a first control signal. The preset threshold is a preset overvoltage threshold, and the first control signal comprises a first overvoltage signal and a first non-overvoltage signal. In this embodiment, the first comparing unit 222 is specifically configured to: if the digital voltage value is larger than a preset overvoltage threshold value, outputting a first overvoltage signal; or if the digital voltage value is smaller than the preset overvoltage threshold value, outputting a first overvoltage-free signal.
The second control module 230 includes a second comparing unit 231, and the second comparing unit 231 is connected to the total sampling module 210, and is configured to compare the analog voltage signal with a preset threshold value, and output a second control signal. The preset threshold is a preset overvoltage threshold, and the second control signal comprises a second overvoltage signal and a second overvoltage signal. In this embodiment, the second comparing unit 231 is specifically configured to: if the analog voltage signal is larger than the preset overvoltage threshold value, outputting a second overvoltage signal; or if the analog voltage signal is smaller than the preset overvoltage threshold value, outputting a second overvoltage-free signal.
The driving module 240 is configured to output a driving signal according to the first control signal and the second control signal. Wherein the driving signals include a turn-off charging driving signal and a turn-on charging driving signal. In this embodiment, the driving module 240 is specifically configured to: outputting a closing charging driving signal when the first overvoltage signal and/or the second overvoltage signal exist; or, the first overvoltage-free signal and the second overvoltage-free signal exist, and the charging driving signal is output to be turned on. "present" means that the first comparing unit 222 outputs the first control signal or the second comparing unit 231 outputs the second control signal. The "presence of the first overvoltage signal and/or the second overvoltage signal" includes three conditions: the first comparing unit 222 outputs a first overvoltage signal, and the second comparing unit 231 outputs a second overvoltage signal; the second comparing unit 231 outputs a second overvoltage signal, and the first comparing unit 222 outputs a first overvoltage-free signal; the first comparing unit 222 outputs a first overvoltage signal, and the second comparing unit 231 outputs a second overvoltage signal. The "presence of the first and second overvoltage signals" means that the first comparing unit 222 outputs the first overvoltage signal and the second comparing unit 231 outputs the second overvoltage signal.
The switch module 250 is connected to the driving module 240, and is configured to drive the switch to be turned on or off according to the driving signal. Wherein the switch is a charging switch 251. In this embodiment, the switch module 250 is specifically configured to: driving the charging switch to be closed according to the charging closing driving signal; or, the charging switch is driven to be turned on according to the turn-on charging driving signal.
In this embodiment, when the battery management system is charged, the working process of the protection device 200 is approximately: the total sampling module 210 collects a sampling voltage signal of the battery management system and converts the sampling voltage signal into an analog voltage signal, an analog-to-digital conversion unit 221 in the first control module 220 converts the analog voltage signal into a digital voltage value and sends the digital voltage value to a first comparison unit 222, the first comparison unit 222 compares the digital voltage value with a preset overvoltage threshold value, if the digital voltage value is greater than the preset overvoltage threshold value, a first overvoltage signal is output, and a second comparison unit 231 compares the analog voltage signal with the preset threshold value, and if the analog voltage signal is greater than the preset overvoltage threshold value, a second overvoltage signal is output; the driving module 240 receives at least one of the first overvoltage signal and the second overvoltage signal, and outputs a charging-off driving signal, and the switching module 250 drives the charging switch to be turned off.
The protection device 200 in this embodiment realizes dual protection by providing two control units, which can improve the safety of the charging process of the battery management system and prevent explosion caused by overcharge of the battery due to system failure.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a protection device of a battery management system according to another embodiment of the present invention. As shown in fig. 3, the protection device 300 of the battery management system of the present embodiment includes a total sampling module 310, a first control module 320, a second control module 330, a driving module 340, and a switching module 350. In this embodiment, the battery management system is in a discharge mode.
The total sampling module 310 is the same as the first embodiment, and is not described herein again.
The first control module 320 includes a digital-to-analog conversion unit 321 and a first comparison unit 322. The digital-to-analog conversion unit 321 is connected to the total sampling module 310, and is configured to convert the analog voltage signal sent by the total sampling module 310 into a digital voltage value. The first comparing unit 322 is configured to compare the digital voltage value with a preset threshold, and output a first control signal. The preset threshold is a preset undervoltage threshold, and the first control signal includes a first undervoltage signal and a first undervoltage signal. In this embodiment, the first comparing unit 322 is specifically configured to: if the digital voltage value is smaller than the preset undervoltage threshold value, outputting a first undervoltage signal; or, if the digital voltage value is greater than the preset undervoltage threshold value, outputting a first undervoltage-not-detected signal.
The second control module 330 includes a second comparing unit 331, and the second comparing unit 331 is connected to the total sampling module 310, and configured to compare the analog voltage signal with a preset threshold value, and output a second control signal. The preset threshold is a preset undervoltage threshold, and the second control signal includes a second undervoltage signal and a second undervoltage signal. In this embodiment, the second comparing unit 331 is specifically configured to: if the analog voltage signal is smaller than the preset undervoltage threshold value, outputting a second undervoltage signal; or if the analog voltage signal is greater than the preset overvoltage threshold, outputting a second undervoltage signal.
The driving module 340 is configured to output a driving signal according to the first control signal and the second control signal. Wherein the driving signal includes a turn-off discharge driving signal and a turn-on discharge driving signal. In this embodiment, the driving module 340 is specifically configured to: outputting a closing discharge driving signal when a first undervoltage signal and/or a second undervoltage signal exist; or, the first undervoltage signal and the second undervoltage signal exist, and the discharge driving signal is output and opened. "present" means that the first comparison unit 322 outputs the first control signal or the second comparison unit 331 outputs the second control signal. "the presence of the first brown-out signal and/or the second brown-out signal" includes three cases: the first comparing unit 322 outputs a first under-voltage signal, and the second comparing unit 331 outputs a second under-voltage signal; the second comparing unit 331 outputs a second under-voltage signal, and the first comparing unit 322 outputs a first under-voltage signal; the first comparing unit 222 outputs a first brown-out signal, and the second comparing unit 331 outputs a second brown-out signal. The "existence of the first and second un-brownout signals" means that the first comparing unit 322 outputs the first un-brownout signal and the second comparing unit 331 outputs the second un-brownout signal.
The switch module 350 is connected to the driving module 340, and is configured to drive the switch to be turned on or off according to the driving signal. Wherein the switch is a discharge switch 351. In this embodiment, the switch module 350 is specifically configured to: driving the discharge switch to close according to the closing discharge driving signal; alternatively, the discharge switch is driven to be turned on in accordance with the on-discharge drive signal.
In this embodiment, when the battery management system is charged, the working process of the protection device 300 is approximately: the total sampling module 310 collects a sampling voltage signal of the battery management system and converts the sampling voltage signal into an analog voltage signal, an analog-to-digital conversion unit 321 in the first control module 320 converts the analog voltage signal into a digital voltage value and sends the digital voltage value to a first comparison unit 322, the first comparison unit 322 compares the digital voltage value with a preset undervoltage threshold value, if the digital voltage value is smaller than the preset undervoltage threshold value, a first undervoltage signal is output, and a second comparison unit 331 compares the analog voltage signal with the preset threshold value, and if the analog voltage signal is smaller than the preset undervoltage threshold value, a second undervoltage signal is output; the driving module 340 receives at least one of the first under-voltage signal and the second under-voltage signal, and outputs a discharge-closing driving signal, and the switching module 350 drives the discharge switch to close.
The protection device 300 in this embodiment realizes dual protection by providing two control units, which can improve the safety of the discharging process of the battery management system and prevent permanent damage caused by over-discharge of the battery due to system failure.
Example four
Fig. 4 is a flowchart illustrating a protection method of a battery management system according to an embodiment of the present invention. The protection method is applied to the protection device of the above embodiment, and as shown in fig. 4, the protection method includes:
410. collecting a sampling voltage signal of a battery management system, and converting the sampling voltage signal into an analog voltage signal;
420. converting the analog voltage signal into a digital voltage value, comparing the digital voltage value with a preset threshold value, and outputting a first control signal;
430. comparing the analog voltage signal with the preset threshold value, and outputting a second control signal;
440. outputting a driving signal according to the first control signal and the second control signal;
450. and according to the driving signal, the driving switch is turned on or off.
Optionally, step 410 comprises:
411. amplifying a voltage signal of the battery management system;
412. filtering the amplified voltage signal;
413. sampling the filtered voltage signal to obtain the sampled voltage signal;
414. and converting the sampling voltage signal into an analog voltage signal, and sending the analog voltage signal.
Optionally, as shown in fig. 5, the preset threshold includes a preset overvoltage threshold, the first control signal includes a first overvoltage signal, and step 420 includes:
421. if the digital voltage value is larger than the preset overvoltage threshold value, outputting the first overvoltage signal; or,
422. and if the digital voltage value is smaller than the preset overvoltage threshold value, outputting the first overvoltage-free signal.
Optionally, the second control signal comprises a second over-voltage signal, and step 430 comprises:
431. if the analog voltage signal is larger than the preset overvoltage threshold value, outputting a second overvoltage signal; or,
432. and if the analog voltage signal is smaller than the preset overvoltage threshold value, outputting the second overvoltage-free signal.
Optionally, the driving signal includes a turn-off charging driving signal, and step 440 includes:
441. outputting the closing charging driving signal when the first overvoltage signal and/or the second overvoltage signal exist; or,
442. and outputting the opening charging driving signal when the first overvoltage signal and the second overvoltage signal are not over-voltage.
Optionally, the switch comprises a charge switch, and step 450 comprises:
451. driving the charging switch to be turned off according to the charging-off driving signal; or,
452. and driving the charging switch to be switched on according to the switching-on charging driving signal.
Optionally, as shown in fig. 6, the preset threshold includes a preset brown-out threshold, the first control signal includes a first brown-out signal, and step 420 further includes:
423. if the digital voltage value is smaller than the preset undervoltage threshold value, outputting the first undervoltage signal; or,
424. if the digital voltage value is larger than the preset undervoltage threshold value, outputting the first undervoltage-free signal;
optionally, the second control signal includes a second brown-out signal, and step 430 further includes:
433. if the analog voltage signal is smaller than the preset undervoltage threshold value, outputting the second undervoltage signal; or,
434. and if the analog voltage signal is greater than the preset undervoltage threshold value, outputting the second undervoltage-free signal.
Optionally, the driving signal further includes an opening discharge driving signal, and step 440 further includes:
443. outputting the closing discharge driving signal when the first undervoltage signal and/or the second undervoltage signal exist; or,
444. and outputting the opening discharge driving signal when the first undervoltage signal and the second undervoltage signal exist.
Optionally, the switch comprises a discharge switch, and step 450 further comprises:
451. driving the discharge switch to be closed according to the discharge closing driving signal; or;
452. and driving the discharge switch to be opened according to the opening discharge driving signal.
Since the method embodiment and the apparatus embodiment are based on the same concept, the contents of the method embodiment may refer to the apparatus embodiment on the premise that the contents do not conflict with each other, and are not described herein again.
The protection method provided by the embodiment can improve the safety of the battery management system in the using process, prevent explosion or permanent damage caused by overcharge or overdischarge of the battery due to system faults, and prolong the service life of the battery.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A protection device of a battery management system is characterized by comprising a total sampling module, a first control module, a second control module, a driving module and a switch module,
the total sampling module is used for collecting a sampling voltage signal of the battery management system and converting the sampling voltage signal into an analog voltage signal;
the first control module includes:
the analog-to-digital conversion unit is connected with the total sampling module and is used for converting the analog voltage signal into a digital voltage value;
the first comparison unit is connected with the analog-to-digital conversion unit and used for comparing the digital voltage value with a preset threshold value and outputting a first control signal;
the second control module includes:
the second comparison unit is connected with the total sampling module and used for comparing the analog voltage signal with the preset threshold value and outputting a second control signal;
the driving module is connected with the first control module and the second control module and used for outputting a driving signal according to the first control signal and the second control signal;
the switch module is connected with the driving module and used for driving the switch to be turned on or turned off according to the driving signal.
2. The protection device of claim 1, wherein the total sampling module comprises:
the sampling unit is used for sampling a voltage signal of the battery management system to obtain the sampled voltage signal;
and the digital-to-analog conversion unit is connected with the sampling unit, converts the sampling voltage signal into an analog voltage signal, and sends the analog voltage signal to the first control module and the second control module.
3. The protection device of claim 2, wherein the total sampling module further comprises:
the signal amplification unit is connected with the battery management system and used for amplifying a voltage signal of the battery management system;
and the signal filtering unit is connected with the signal amplifying unit and the sampling unit, and is used for filtering the amplified voltage signal and sending the filtered voltage signal to the sampling unit.
4. The protection device of claim 1, wherein the preset threshold comprises a preset over-voltage threshold, the first control signal comprises a first over-voltage signal, the second control signal comprises a second over-voltage signal,
the first comparing unit is specifically configured to:
if the digital voltage value is larger than the preset overvoltage threshold value, outputting the first overvoltage signal;
the second comparing unit is specifically configured to:
and if the analog voltage signal is larger than the preset overvoltage threshold value, outputting the second overvoltage signal.
5. The protection device of claim 4, wherein the drive signal comprises a turn-off charge drive signal, the switch comprises a charge switch,
the drive module is specifically configured to:
outputting the closing charging driving signal when the first overvoltage signal and/or the second overvoltage signal exist;
the switch module is specifically configured to:
and driving the charging switch to be closed according to the charging closing driving signal.
6. The protection device of claim 5, wherein the first control signal further comprises a first no-over-voltage signal, the second control signal further comprises a second no-over-voltage signal,
the first comparison unit is further configured to:
if the digital voltage value is smaller than the preset overvoltage threshold value, outputting the first overvoltage-free signal;
the second comparing unit is further configured to:
and if the analog voltage signal is smaller than the preset overvoltage threshold value, outputting the second overvoltage-free signal.
7. The protection device of claim 6, wherein the drive signal comprises a further turn-on charge drive signal,
the drive module is further configured to:
outputting the opening charge driving signal when the first overvoltage signal and the second overvoltage signal are not over-voltage;
the switch module is further configured to:
and driving the charging switch to be switched on according to the switching-on charging driving signal.
8. The protection device of claim 1, wherein the predetermined threshold comprises a predetermined brown-out threshold, the first control signal comprises a first brown-out signal, the second control signal comprises a second brown-out signal,
the first comparing unit is specifically configured to:
if the digital voltage value is smaller than the preset undervoltage threshold value, outputting the first undervoltage signal;
the second comparing unit is specifically configured to:
and if the analog voltage signal is smaller than the preset undervoltage threshold value, outputting the second undervoltage signal.
9. The protection device of claim 8, wherein the drive signal comprises a turn-off discharge drive signal, the switch comprises a discharge switch,
the drive module is specifically configured to:
outputting the closing discharge driving signal when the first undervoltage signal and/or the second undervoltage signal exist;
the switch module is specifically configured to:
and driving the discharge switch to be closed according to the closing discharge driving signal.
10. The protection device of claim 9, wherein the first control signal further comprises a first not under-voltage signal, the second control signal further comprises a second not under-voltage signal,
the first comparison unit is further configured to:
if the digital voltage value is larger than the preset undervoltage threshold value, outputting the first undervoltage-free signal;
the second comparing unit is further configured to:
and if the analog voltage signal is greater than the preset undervoltage threshold value, outputting the second undervoltage-free signal.
11. The protection device of claim 10, wherein the drive signal further comprises an open discharge drive signal,
the drive module is further configured to:
outputting the opening discharge driving signal when the first undervoltage signal and the second undervoltage signal exist;
the switch module is further configured to:
and driving the discharge switch to be opened according to the opening discharge driving signal.
12. A protection method of a battery management system applied to the protection device according to any one of claims 1 to 11, characterized in that:
collecting a sampling voltage signal of a battery management system, and converting the sampling voltage signal into an analog voltage signal;
converting the analog voltage signal into a digital voltage value, comparing the digital voltage value with a preset threshold value, and outputting a first control signal;
comparing the analog voltage signal with the preset threshold value, and outputting a second control signal;
outputting a driving signal according to the first control signal and the second control signal;
and according to the driving signal, the driving switch is turned on or off.
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