CN113954693B - Lithium battery balance control method, system and storage medium - Google Patents
Lithium battery balance control method, system and storage medium Download PDFInfo
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- CN113954693B CN113954693B CN202111180716.0A CN202111180716A CN113954693B CN 113954693 B CN113954693 B CN 113954693B CN 202111180716 A CN202111180716 A CN 202111180716A CN 113954693 B CN113954693 B CN 113954693B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery equalization control method, a lithium battery equalization control system and a storage medium, wherein the method comprises the following steps: acquiring an average voltage signal of a battery pack through an average voltage acquisition module, and transmitting the average voltage signal to a conversion module; converting the average voltage signal into a square wave signal through the conversion module and transmitting the square wave signal to the voltage comparison module; the voltage comparison module compares the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judges whether the voltage of any single battery in the battery pack is higher than the average voltage; and if the voltage of the single battery in the battery pack is higher than the average voltage, starting an equalizing module to charge the battery pack until the voltages of all the single batteries are equal to the average voltage. The invention reduces the balancing cost, reduces the volume of a balancing system, improves the balancing reliability, can efficiently balance the series lithium batteries, and can be widely applied to the technical field of battery balancing control.
Description
Technical Field
The invention relates to the technical field of battery equalization control, in particular to a lithium battery equalization control method, a lithium battery equalization control system and a storage medium.
Background
With the growing awareness of the huge destruction of fossil fuels to the global climate, the development of new energy vehicles has become an important direction for the technological innovation of the automobile industry in the world and a necessary choice for the sustainable development of the automobile industry. Because the lithium battery has the excellent performances of high energy density, long storage life, no memory effect, low self-discharge rate and the like, the lithium battery is generally applied to new energy automobiles at present.
Because the voltage of monomer lithium cell is lower, can't satisfy electric automobile to the demand of voltage, need use a plurality of monomer lithium cell series connection, nevertheless the difference of lithium cell monomer manufacturing and service environment leads to the inconsistency to appear among the battery cell performance, and this inconsistency can strengthen gradually in the use of battery, reduces monomer battery's life-span by a wide margin, seriously influences the availability factor of group battery.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, and a storage medium for controlling balancing of lithium batteries, so as to solve the problem of consistency when a plurality of batteries are used in series.
One aspect of the present invention provides a lithium battery equalization control method, including:
acquiring an average voltage signal of the battery pack through an average voltage acquisition module, and transmitting the average voltage signal to a conversion module;
converting the average voltage signal into a square wave signal through the conversion module and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module compares the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judges whether the voltage of any single battery in the battery pack is higher than the average voltage;
and if the voltage of the single battery in the battery pack is higher than the average voltage, starting an equalizing module to charge the battery pack until the voltages of all the single batteries are equal to the average voltage.
Optionally, the obtaining, by the average voltage collecting module, an average voltage signal of the battery pack, and transmitting the average voltage signal to the converting module includes:
and acquiring the average voltage of the battery pack through an addition and subtraction circuit based on an operational amplifier to obtain an average voltage signal.
Optionally, the converting, by the conversion module, the average voltage signal into a square wave signal includes:
generating a square wave by a square wave generator;
when the square wave is at a low level, the first triode is turned off; when the square wave is at a high level, conducting a first triode; the average voltage signal is driven by a second triode and transmitted to the first triode;
the drain electrode of the first triode outputs a square wave signal with the value of the voltage signal as the amplitude;
and transmitting the square wave signal to a voltage comparison module through a capacitor.
Optionally, the method further comprises:
isolating the square wave generator and a voltage comparison circuit in the voltage comparison module through a voltage follower;
the voltage follower comprises an amplifier and two resistors.
Optionally, the voltage comparison module comprises a rectification circuit;
the rectifying circuit is used for reducing the square wave signal into a direct current average voltage signal;
the voltage balance judging step of the voltage comparison module comprises the following steps:
taking the negative electrode of a single battery in the battery pack as the ground electrode of a rectifying circuit;
obtaining the sum of the single battery cathode voltage and the average direct current voltage signal;
and comparing the sum result with the voltage of the anode of each battery by using an operational amplifier, and outputting a signal of an equalization judgment result.
Optionally, the method further comprises:
comparing the direct current voltage signal with the average voltage signal through an operational amplifier of the voltage signal compensation circuit;
adjusting the direct current voltage signal according to the output voltage of the operational amplifier to obtain a feedback loop;
and the voltage of the negative polarity of the operational amplifier approaches to the average voltage through the feedback loop so as to reduce the error of the voltage comparison module.
Another aspect of the embodiments of the present invention provides a lithium battery equalization control system, including:
the average voltage acquisition module is used for acquiring an average voltage signal of the battery pack and transmitting the average voltage signal to the conversion module;
the conversion module is used for converting the average voltage signal into a square wave signal and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module is used for comparing the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judging whether the voltage of any single battery in the battery pack is higher than the average voltage or not;
and the equalizing module is used for charging the battery pack when the voltage of the single battery in the battery pack is higher than the average voltage until the voltage of all the single batteries is equal to the average voltage.
Another aspect of the embodiments of the present invention provides an electronic device, including a processor and a memory;
the memory is used for storing programs;
the processor executes the program to implement the method as described above.
Another aspect of the embodiments of the present invention provides a computer-readable storage medium storing a program, the program being executed by a processor to implement the method as described above.
Another aspect of embodiments of the present invention provides a computer program product comprising a computer program which, when executed by a processor, implements a method as described above.
According to the embodiment of the invention, an average voltage signal of a battery pack is acquired through an average voltage acquisition module, and the average voltage signal is transmitted to a conversion module; converting the average voltage signal into a square wave signal through the conversion module and transmitting the square wave signal to the voltage comparison module; the voltage comparison module compares the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judges whether the voltage of any single battery in the battery pack is higher than the average voltage; and if the voltage of the single battery in the battery pack is higher than the average voltage, starting an equalization module to charge the battery pack until the voltage of all the single batteries is equal to the average voltage. The invention reduces the balancing cost, reduces the volume of the balancing system, improves the balancing reliability and can efficiently balance the series lithium batteries.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an overall structure provided in an embodiment of the present invention;
fig. 2 is a structural diagram of an average voltage acquisition module according to an embodiment of the present invention;
FIG. 3 is a block diagram of a voltage-to-signal conversion module according to an embodiment of the present invention;
FIG. 4 is a diagram of a voltage comparison module according to an embodiment of the present invention;
FIG. 5 is a block diagram of a voltage signal compensation circuit according to an embodiment of the present invention;
fig. 6 is a diagram of an equalizing module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Aiming at the problems in the prior art, the embodiment of the invention provides a lithium battery equalization control method, which comprises the following steps:
acquiring an average voltage signal of the battery pack through an average voltage acquisition module, and transmitting the average voltage signal to a conversion module;
converting the average voltage signal into a square wave signal through the conversion module and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module compares the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judges whether the voltage of any single battery in the battery pack is higher than the average voltage;
and if the voltage of the single battery in the battery pack is higher than the average voltage, starting an equalizing module to charge the battery pack until the voltages of all the single batteries are equal to the average voltage.
Optionally, the obtaining, by the average voltage acquisition module, an average voltage signal of the battery pack, and transmitting the average voltage signal to the conversion module includes:
and acquiring the average voltage of the battery pack through an addition and subtraction circuit based on an operational amplifier to obtain an average voltage signal.
Optionally, the converting, by the conversion module, the average voltage signal into a square wave signal includes:
generating a square wave by a square wave generator;
when the square wave is at a low level, the first triode is turned off; when the square wave is at a high level, conducting a first triode; the average voltage signal is driven by a second triode and transmitted to the first triode;
the drain electrode of the first triode outputs a square wave signal with the value of the voltage signal as the amplitude;
and transmitting the square wave signal to a voltage comparison module through a capacitor.
Optionally, the method further comprises:
isolating the square wave generator and a voltage comparison circuit in the voltage comparison module through a voltage follower;
the voltage follower comprises an amplifier and two resistors.
Optionally, the voltage comparison module comprises a rectification circuit;
the rectifying circuit is used for reducing the square wave signal into a direct current average voltage signal;
the voltage balance judging step of the voltage comparison module comprises the following steps:
taking the negative electrode of a single battery in the battery pack as the ground electrode of a rectifying circuit;
obtaining the sum of the single battery cathode voltage and the average direct current voltage signal;
and comparing the sum result with the voltage of the anode of each battery by using an operational amplifier, and outputting a signal of an equalization judgment result.
Optionally, the method further comprises:
comparing the direct current voltage signal with the average voltage signal through an operational amplifier of the voltage signal compensation circuit;
adjusting the direct current voltage signal according to the output voltage of the operational amplifier to obtain a feedback loop;
and the voltage of the negative polarity of the operational amplifier approaches to the average voltage through the feedback loop so as to reduce the error of the voltage comparison module.
Another aspect of the embodiments of the present invention provides a lithium battery equalization control system, including:
the average voltage acquisition module is used for acquiring an average voltage signal of the battery pack and transmitting the average voltage signal to the conversion module;
the conversion module is used for converting the average voltage signal into a square wave signal and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module is used for comparing the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judging whether the voltage of any single battery in the battery pack is higher than the average voltage or not;
and the equalizing module is used for charging the battery pack when the voltage of the single battery in the battery pack is higher than the average voltage until the voltage of all the single batteries is equal to the average voltage.
Another aspect of the embodiments of the present invention provides an electronic device, including a processor and a memory;
the memory is used for storing programs;
the processor executes the program to implement the method as described above.
Another aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores a program, which is executed by a processor to implement the method as described above.
Another aspect of embodiments of the present invention provides a computer program product comprising a computer program which, when executed by a processor, implements a method as described above.
The following describes in detail the implementation principle of the equalization control method according to the embodiment of the present invention with reference to the accompanying drawings:
the invention can realize the autonomous equalization of the battery pack only through a general analog circuit without a microprocessor, thereby achieving the purposes of reducing the equipment cost, improving the equalization reliability, reducing the operation burden of the microprocessor and the like; aiming at the problem that the traditional battery equalization system depends on the control of a microprocessor, the invention provides a circuit system which can realize battery equalization only by using an analog circuit without the microprocessor or other digital circuits; the invention further realizes a balance control circuit system which enables the single batteries to tend to be consistent under the condition of not using a microprocessor.
The lithium battery equalization system provided by the invention is composed of the following four modules: the device comprises an average voltage acquisition module, a voltage-signal conversion module, a voltage comparison module and a balancing module.
The method comprises the following steps:
as shown in fig. 1, the average voltage acquisition module obtains the average voltage of the battery pack and transmits an average voltage signal to the voltage-signal conversion module; the voltage-signal conversion module converts the average voltage signal into a square wave signal and transmits the square wave signal to the voltage comparison module; the voltage comparison module compares the voltage value of each single battery with the average voltage of the battery pack, and then judges whether the voltage of each single battery is higher than the average value. If the voltage is higher than the average value, the equalizing module of the battery is started to charge the whole battery until the voltage of the battery is equal to the average value, so that the aim of equalizing the electric quantity of the battery is fulfilled.
The implementation principle of each module is described in detail below:
(1) average voltage acquisition module
The invention utilizes the addition and subtraction operation circuit based on the operational amplifier to collect the average voltage of the battery pack, and has higher accuracy.
As shown in fig. 2, the average voltage of the output can be calculated as:
to make UOSatisfies the following conditions:
Adjustable R1、R2、R3、R4Such that it satisfies:
(2) voltage-signal conversion module
As shown in fig. 3, a square wave is first generated by a square wave generator, Q1 is turned on when the square wave is at high level, and the voltage signal is transmitted to Q1 through Q2 drive. The Q1 is off when the square wave is low. The drain of Q1 outputs a square wave signal having the value of the voltage signal as the amplitude. Since the entire battery pack is connected in series and a voltage signal needs to be output to each battery, a capacitor is required to separate the battery pack from the signal circuit. And transmitting the square wave signal to a voltage comparison module through a capacitor. A voltage follower consisting of U1A, R3 and R4 isolates front and rear circuits.
(3) Voltage comparison module
As shown in fig. 4, the square wave signal is passed through a rectifying circuit composed of C1, C2, D1, D2, R1, and R2 to be reduced to a dc voltage signal. And taking the cathode of the battery as the ground level of the rectifying circuit to obtain the sum of the voltage of the cathode of the single battery and the direct-current voltage signal. And comparing the voltage sum value with the voltage of the battery anode by using the operational amplifier, and outputting a balance judgment signal to switch on or switch off a subsequent balance module.
(4) Voltage signal compensation circuit
As shown in fig. 5, the voltage signal compensation circuit is similar to the voltage comparison circuit, and compares the dc voltage signal with the average voltage by using the operational amplifier, and adjusts the dc voltage signal by using the output voltage of the operational amplifier to form a feedback loop, so that the voltage at the negative terminal of the operational amplifier approaches the average voltage. And the error of the voltage comparison module is reduced. The fluctuation of the output voltage is reduced by C3.
(5) Equalization module
As shown in fig. 6, the equalization determination signal is used to control the on/off of the DC-DC boost circuit, and the battery with the voltage higher than the average voltage charges the whole battery pack through the DC-DC boost circuit.
In conclusion, the invention utilizes the analog circuit system to carry out equalization, thereby reducing the equipment cost, reducing the volume of the equalization system and improving the equalization reliability and efficiency.
In alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flow charts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are performed independently.
Furthermore, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise indicated to the contrary, one or more of the described functions and/or features may be integrated in a single physical device and/or software module, or one or more functions and/or features may be implemented in separate physical devices or software modules. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present invention. Rather, the actual implementation of the various functional modules in the apparatus disclosed herein will be understood within the ordinary skill of an engineer, given the nature, function, and internal relationship of the modules. Accordingly, those of ordinary skill in the art will be able to practice the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative of and not intended to limit the scope of the invention, which is defined by the appended claims and their full scope of equivalents.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A lithium battery equalization control method is characterized by comprising the following steps:
acquiring an average voltage signal of the battery pack through an average voltage acquisition module, and transmitting the average voltage signal to a conversion module;
converting the average voltage signal into a square wave signal through the conversion module and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module compares the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judges whether the voltage of any single battery in the battery pack is higher than the average voltage;
and if the voltage of the single battery in the battery pack is higher than the average voltage, starting an equalizing module to charge the battery pack until the voltages of all the single batteries are equal to the average voltage.
2. The lithium battery equalization control method of claim 1, wherein the obtaining of the average voltage signal of the battery pack by the average voltage acquisition module and the transmission of the average voltage signal to the conversion module comprise:
and acquiring the average voltage of the battery pack through an addition and subtraction circuit based on an operational amplifier to obtain an average voltage signal.
3. The lithium battery equalization control method of claim 1, wherein the converting the average voltage signal into a square wave signal by the converting module comprises:
generating a square wave by a square wave generator;
when the square wave is in a low level, the first triode is turned off; when the square wave is in a high level, conducting a first triode; the average voltage signal is driven by a second triode and transmitted to the first triode;
the drain electrode of the first triode outputs a square wave signal with the value of the voltage signal as the amplitude;
and transmitting the square wave signal to a voltage comparison module through a capacitor.
4. The lithium battery equalization control method as claimed in claim 3, further comprising:
isolating the square wave generator and a voltage comparison circuit in the voltage comparison module through a voltage follower;
the voltage follower comprises an amplifier and two resistors.
5. The lithium battery equalization control method according to claim 1, wherein the voltage comparison module comprises a rectification circuit;
the rectifying circuit is used for reducing the square wave signal into a direct current average voltage signal;
the voltage balance judging step of the voltage comparison module comprises the following steps:
taking the negative electrode of a single battery in the battery pack as the ground electrode of a rectifying circuit;
obtaining the sum of the single battery cathode voltage and the average direct current voltage signal;
and comparing the sum result with the voltage of the anode of each battery by using an operational amplifier, and outputting a signal of an equalization judgment result.
6. The lithium battery equalization control method of claim 1, further comprising:
comparing the direct current voltage signal with the average voltage signal through an operational amplifier of the voltage signal compensation circuit;
adjusting the direct current voltage signal according to the output voltage of the operational amplifier to obtain a feedback loop;
and the voltage of the negative polarity of the operational amplifier approaches to the average voltage through the feedback loop so as to reduce the error of the voltage comparison module.
7. A lithium battery equalization control system, comprising:
the average voltage acquisition module is used for acquiring an average voltage signal of the battery pack and transmitting the average voltage signal to the conversion module;
the conversion module is used for converting the average voltage signal into a square wave signal and transmitting the square wave signal to the voltage comparison module;
the voltage comparison module is used for comparing the voltage value of each single battery in the battery pack with the average voltage of the battery pack and judging whether the voltage of any single battery in the battery pack is higher than the average voltage or not;
and the equalizing module is used for charging the battery pack when the voltage of the single battery in the battery pack is higher than the average voltage until the voltage of all the single batteries is equal to the average voltage.
8. An electronic device comprising a processor and a memory;
the memory is used for storing programs;
the processor executing the program realizes the method of any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that the storage medium stores a program which is executed by a processor to implement the method according to any one of claims 1 to 6.
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|---|---|---|---|---|
| US5528122A (en) * | 1994-11-29 | 1996-06-18 | Ventron Corporation | Battery voltage equalizer circuit |
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