CN111435792A - Battery electric quantity balance compensation system - Google Patents
Battery electric quantity balance compensation system Download PDFInfo
- Publication number
- CN111435792A CN111435792A CN201910026021.3A CN201910026021A CN111435792A CN 111435792 A CN111435792 A CN 111435792A CN 201910026021 A CN201910026021 A CN 201910026021A CN 111435792 A CN111435792 A CN 111435792A
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- Prior art keywords
- battery
- current
- electric
- electric quantity
- balance
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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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- 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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
A battery power balance compensation system comprises a battery pack, a plurality of battery cores and a plurality of control circuits, wherein the battery pack comprises a plurality of battery cores; each battery core corresponds to each battery selection switch; a voltage measuring unit electrically connected with the battery pack and used for measuring the electric quantity of the battery cell; a processor electrically connected to the voltage measuring unit and the battery selection switches; the electric quantity compensation module is electrically connected with the processor, after the processor confirms the electric quantities of the plurality of electric cores, the electric quantity compensation module is controlled to respectively compensate the electric quantities of the plurality of appointed electric cores through the battery selection switch, the electric quantity compensation module comprises a current selection switch and consists of a plurality of adjustment units, and the electric quantity compensation module is adjusted through the plurality of adjustment units to input the appointed electric current of the electric cores.
Description
Technical Field
The present invention relates to a battery power balance compensation system, and more particularly, to a battery power balance compensation system capable of balancing and compensating the power of each cell in a battery pack.
Background
With the progress of science and technology, the production and research of lithium battery cells have made a great breakthrough, because the lithium battery cells have the characteristics of stable discharge voltage, low self-discharge rate, wide working temperature range, no memory effect, long storage life, light weight, small size and the like, the lithium battery cells gradually replace the traditional nickel-cadmium battery cells or lead-acid storage battery cells.
As the application of lithium battery cells is more and more widespread, the management of the battery cells becomes a very important technology in various devices. Because the chemical reaction is very complicated inside the lithium battery cell, the management technology and the use of the battery cell are continuously researched while the self performance of the battery cell is continuously improved, so that the service life of the battery cell is prolonged, the efficiency of the battery cell is improved, and the performance of the battery cell is exerted to the maximum.
A Battery Management System (BMS), which is a System for balancing and managing the electric quantity of cells in a Battery pack, has a function of measuring the voltage of the cells, and prevents or avoids abnormal situations such as over-discharge, over-charge, and over-temperature of the cells. It relates to microcomputer technology and detection technology, and can make the electric core in optimum working state, reduce running cost and raise service life.
However, when performing the electric quantity balance, a general active balance battery management system often cannot consider the electric quantity state of each cell to provide the most suitable balance current, so as to achieve the purpose of protecting the cells and prolonging the service life.
The imbalance of the electric quantity of the battery cells in the battery pack is caused by a plurality of factors, such as self-discharge conditions, some battery cells have more self-discharge, and some battery cells have less self-discharge. The battery cell has less self-discharge and higher voltage, and can be charged fully quickly during charging; the battery core has more self-discharge, lower voltage and slow and full charging time.
In addition, in the prior art, the cells are charged with a fixed voltage/current (power balance) by using an external power supply or a battery pack power supply, the cell to be charged and the input power supply voltage are prone to have an excessive voltage difference, so that excessive current injection is caused, and the Switch (Switch) is prone to be damaged (a chip (IC) is burnt) by large current input.
Therefore, in view of the above problems, it is necessary to design a novel battery management system, which can manage the cell aging problem, and apply a matching current to a single cell, so as to not only avoid burning out the switch, but also prolong the service life of the whole battery pack.
Disclosure of Invention
The invention aims at providing a battery electric quantity balance compensation system which has various open and open architectures and aims at carrying out electric quantity compensation on battery cores with different voltages and heights so as to achieve the aim of global battery balance.
According to the above object, the present invention provides a battery cell balance compensation system, comprising: the battery pack comprises a plurality of battery cells; each battery core corresponds to each battery selection switch; a voltage measuring unit electrically connected with the battery pack for estimating the electric quantity of the battery cell; a processor electrically connected to the voltage measuring unit and the plurality of battery selection switches; the electric quantity compensation module is electrically connected with the processor, after the processor confirms the electric quantity of each electric core, the electric quantity compensation module is controlled to respectively compensate the electric quantity of the appointed electric core through the battery selection switch, the electric quantity compensation module comprises a current selection switch and consists of a plurality of adjustment units, and the electric quantity compensation module inputs the appointed electric current of the electric core through the adjustment of the adjustment units.
In the battery power balance compensation system, each adjusting unit comprises a current-limiting resistor and a switch.
The battery power balance compensation system comprises a physical metering unit for obtaining an internal resistance value of each battery cell
The battery power balance compensation system comprises a processor, a current selection switch and a switching adjustment unit, wherein the processor controls the switching adjustment unit of the current selection switch according to the voltage of the battery cell, and is used for inputting matched power or current aiming at a specific battery cell.
The battery power balance compensation system, wherein the processor switches the balance switch of each adjusting unit to provide a balance current.
The battery capacity balance compensation system is characterized in that the formula of the balance current is (VDC-VBAT)/(RSE L + RGEAR) in IBA L, wherein VDC is the power supply voltage of the capacity compensation module, VBAT is the voltage value of a balance battery, RSE L is the resistance value of the balance switch, and RGEAR is the resistance value of the current selection switch.
In the battery power balance compensation system, the power compensation module comprises a power conversion component and is electrically connected to a power supply module.
In the battery power balance compensation system, the power conversion component adjusts the input voltage of the power supply module to be matched with the output current of the power compensation module.
In the system for compensating the battery power balance, the power supply module is from an external power source or from the battery pack itself.
In the system for compensating the balance of electric quantity of the battery, the physical metering unit can be an ammeter.
Therefore, the invention adjusts the current flowing through the balance switch by calculating a balance current, thereby avoiding the burning of the balance switch. And the current input to the specified battery cell can be controlled by starting and closing the current selection switch.
As mentioned above, the battery power balance compensation system of the present invention is an active energy management system, and can balance, compensate and manage the power of each battery cell through its battery pack or external power source, so that each battery cell of the battery pack can exert its own power to the maximum efficiency. Meanwhile, the voltage value measured by each battery cell is transmitted to the processor through the voltage measuring unit, so that the processor controls the on and off of each balance switch in the current selection switch, and then adjusts the current selection switch, so that matched current is provided for the specified battery cells needing to be charged, and the purpose of balancing the electric quantity of each battery cell of the battery pack is achieved.
Drawings
Fig. 1 is a block diagram of a battery cell balance compensation system according to the present invention.
Fig. 2 is a circuit diagram of a battery cell balance compensation system according to the present invention.
Fig. 3 is a block diagram of a battery cell balance compensation system according to the present invention.
Reference numerals:
< present invention >
10 battery electric quantity balance compensation device
101 battery pack
102 cell selection switch
103 voltage measuring unit
104 processor
105 electric quantity compensation module
106 current selection switch
107 electric core
108 adjustment unit
109 current limiting resistor
110 balance switch
111 external power supply
112 power supply conversion assembly
113 physical metering unit
114 power supply module
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals or characters refer to the same elements or concepts throughout the different views. The description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 is a block diagram of a battery balancing compensation system according to the present invention, fig. 2 is a circuit diagram of the battery balancing compensation system according to the present invention, and fig. 3 is a block diagram of another embodiment of the battery balancing compensation system according to the present invention. As shown in fig. 1 and fig. 2, the battery power balance compensation system 10 of the present invention includes a battery pack 101, a plurality of battery selection switches 102, a voltage measurement unit 103, a processor 104, a power compensation module 105, a current selection switch 106, and a power supply module 114.
The battery pack 101 includes a plurality of battery cells 107, each battery cell 107 corresponds to one battery selection switch 102, and the battery cell 107 is preferably a secondary battery cell, which may be a lithium battery cell or a nickel battery cell, and is not limited herein, and the secondary battery cells are connected in series.
The voltage measuring unit 103 is electrically connected to the battery pack 101 for measuring the electric quantity of each cell 107. The processor 104 is electrically connected to the voltage measurement unit 103 and the plurality of battery selection switches 102, the electric quantity compensation module 105 is electrically connected to the processor 104 and the battery selection switches 102, and after the processor 104 determines the electric quantity of each battery cell 107, the electric quantity compensation module 105 is controlled to perform electric quantity compensation on the specified battery cell 107 through the battery selection switch 102.
It is to be noted that the electric quantity compensation module 105 provided by the present invention includes a current selection switch 106, which is composed of a plurality of adjusting units 108, and the electric quantity compensation module 105 adjusts the current magnitude of the specified battery cell 107 input by the plurality of adjusting units 108. Each of the adjusting units 108 includes a current-limiting resistor 109 and a balance switch 110, and the resistance of each current-limiting resistor 109 may be the same or different. The adjusting unit 108 adjusts the current input to each battery cell 107 by the power compensation module 105 through the current limiting resistor 109 and the balancing switch 110, so that the most suitable current can be provided for the battery cells 107 with different health degrees, and the accelerated aging of the battery cells 107 due to unsuitable or unmatched current is avoided, so as to prolong the service life of the whole battery pack.
In different embodiments, a physical metering unit 113 is further included to obtain an internal resistance value of each cell 107, and particularly, when performing constant current charging/discharging or standing, the physical metering unit 113 may measure the current value of each cell 107 through the battery selection switch 106, and further calculate the internal resistance value of each cell to know the aging degree or the health state of each cell 107. The physical metering unit 113 may use an ammeter to measure the internal resistance value of each cell 107, but is not limited to the above, and as shown in fig. 3, the internal resistance value of the cell 107 may be calculated by the processor 104 using information of voltage, current, and power. It should be particularly noted that, in the battery power balance compensation system 10 provided by the present invention, the physical metering unit 113 obtains the internal resistance value of each battery cell 107, so that the health condition of each battery cell 107 can be known in real time, and particularly, the system is applied to a battery management system, and the physical metering unit 113 can further monitor the health condition of each battery cell 107, so that the battery management system can send out warning information that a specific battery cell needs to be replaced, thereby further protecting the overall service life of the entire battery pack 101.
Accordingly, the processor 104 controls the current selection switch to switch the adjustment unit 108 according to the electrical state or voltage of each of the battery cells 107, so that the current input to a specific battery cell 107 by the electrical compensation module 105 is controlled within a matching range, and thus, the different internal resistance values of each of the battery cells 107 can be matched with each other by the adjustment unit 108, so as to achieve the purpose of global balance. In other words, the output current can be adaptively adjusted by selecting different currents to balance through the current selection switch 106.
In the embodiment of the present invention, the processor 104 may calculate a balance current by switching the balance switch 110 of each adjusting unit 108, wherein the balance current is calculated by IBA L (VDC-VBAT)/(RSE L + RGEAR), where VDC is the voltage of the charge compensation module 105 and VBAT is the voltage of a balance battery, and in a preferred embodiment, VBAT is the voltage of a balance battery provided by the power supply module 114, RSE L is the resistance of the battery selection switch 102, and RGEAR is the resistance of the current selection switch 106.
In addition, in an embodiment of the invention, the power compensation module 105 includes a power conversion component 112 and is electrically connected to a power supply module 114. The power conversion component 112 is used to adjust the input voltage of the power supply module 114 to an output current of the matching power compensation module 105. It should be noted that, in the battery power balance compensation system 10 of the present invention, the power conversion component 112 can adjust the input voltage of the power supply module 114 to match the output current of the power compensation module 105, so that the power supply module 114 can be from an external power source 111 or from the battery pack 101 itself. If the battery pack 101 from the battery pack 101 itself serves as a power supply source of the power supply module 114, the entire battery pack 101 may actively adjust the balance between the electric quantities of each of the battery cells 107, so as to reduce the electric quantity difference between the battery cells 107.
For example, if the battery pack 101 includes three cells 107, which are cell a, cell B, and cell C, and the remaining power of the battery is 50% (cell a), 60% (cell B), and 70% (cell C) of the original saturation state, the battery power balance compensation system 10 of the present invention can balance the power of the cell a, the cell B, and the cell C, so that the power of the cell a, the cell B, and the cell C is 60%. In the battery pack 101, the voltage of each cell 107 has a high value or a low value, the processor 104 may select the cell 107 with the lowest voltage to start the electric quantity balancing operation, and after knowing that the electric quantity of the cell 107 is balanced by the electric quantity compensation module 105, the processor 104 may perform the balancing operation on the next cell 107.
In summary, the battery power balance compensation system of the present invention is an active energy management system, and can balance, compensate and manage the power of each battery cell by using its battery pack or an external power source as a power supply module, so that each battery cell of the battery pack can exert its own power to the maximum performance. Meanwhile, the processor controls the on and off of each balance switch in the current selection switch to provide a proper balance current so as to compensate the electric quantity of the electric core required to be charged and achieve the purpose of balancing the electric quantity of each electric core of the battery pack.
The traditional battery power balance compensation system is not provided with a current selection switch, and the use range is limited, for example, the voltage of the battery pack can only be adjusted between 3.6V and 4V, while the battery power balance compensation system can realize global battery pack balance through the balance switch. The balance of the global battery pack means that when the voltage of the battery pack is too low, too much current may flow instantaneously, a switch component in the balance circuit may be burned, at this time, the balance switch may be switched, the balance current may be adjusted, the use range of the battery pack may be expanded to 3V to 4V, and due to the limitation of the balance current of the battery, too low cell voltage (large voltage difference) may not cause cell burning or damage of the switch component in the balance circuit due to too much current.
Although the invention has been described in terms of preferred embodiments and examples, it is understood that the invention is not limited thereto, but rather, can be applied to various equivalent embodiments, which can be modified or changed without departing from the spirit and scope of the invention.
Claims (10)
1. A system for compensating for cell charge balance, comprising:
the battery pack comprises a plurality of battery cells;
each battery cell corresponds to each battery selection switch;
a voltage measuring unit electrically connected to the battery pack for measuring the electric quantity of the plurality of battery cells;
the processor is electrically connected with the voltage measuring unit and the plurality of battery selection switches; the electric quantity compensation module is electrically connected with the processor, after the processor confirms the electric quantities of the plurality of electric cores, the electric quantity compensation module is controlled to respectively compensate the electric quantities of the plurality of appointed electric cores through the battery selection switch, the electric quantity compensation module comprises a current selection switch and consists of a plurality of adjustment units, and the electric quantity compensation module is adjusted through the plurality of adjustment units to input the appointed electric current of the electric cores.
2. The system of claim 1, wherein each of the plurality of adjustment units comprises a current limiting resistor and a balancing switch.
3. The system of claim 2, comprising a physical metering unit for obtaining a balancing current value for each of the plurality of cells.
4. The system of claim 2, wherein the processor controls the current selection switch to switch the plurality of adjustment units according to the states of charge or voltages of the plurality of battery cells.
5. The system of claim 2, wherein the processor switches the balancing switch of each of the plurality of adjusting units to calculate an internal resistance of a battery.
6. The battery charge balance compensation system of claim 5, wherein the balance current is calculated by IBA L ═ VDC-VBAT)/(RSE L + RGEAR), VDC is the voltage of the charge compensation module 105, VBAT is the output voltage of the balance battery, RSE L is the resistance of the battery selection switch, and RGEAR is the resistance of the current selection switch.
7. The system of claim 1 or 2, wherein the power compensation module comprises a power conversion module electrically connected to a power supply module.
8. The battery equalization compensation system of claim 7, wherein the power conversion component adjusts an input voltage of the power supply module to match an output current of the charge compensation module.
9. The system of claim 7, wherein the power supply module is from an external power source or from the battery pack.
10. The system of claim 3, wherein the physical metering unit is a current meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026021.3A CN111435792A (en) | 2019-01-11 | 2019-01-11 | Battery electric quantity balance compensation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026021.3A CN111435792A (en) | 2019-01-11 | 2019-01-11 | Battery electric quantity balance compensation system |
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| CN111435792A true CN111435792A (en) | 2020-07-21 |
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| CN201910026021.3A Pending CN111435792A (en) | 2019-01-11 | 2019-01-11 | Battery electric quantity balance compensation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557915A (en) * | 2020-11-30 | 2021-03-26 | Oppo广东移动通信有限公司 | Electric quantity detection circuit, electric quantity detection method and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577227A (en) * | 2014-12-23 | 2015-04-29 | 浙江南都电源动力股份有限公司 | Battery equalization circuit and control system |
| CN104901355A (en) * | 2015-04-14 | 2015-09-09 | 北汽福田汽车股份有限公司 | Pre-charging device and method of electric automobile |
| CN209592234U (en) * | 2019-01-11 | 2019-11-05 | 协同能源科技股份有限公司 | A kind of cell equalization compensation device |
-
2019
- 2019-01-11 CN CN201910026021.3A patent/CN111435792A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577227A (en) * | 2014-12-23 | 2015-04-29 | 浙江南都电源动力股份有限公司 | Battery equalization circuit and control system |
| CN104901355A (en) * | 2015-04-14 | 2015-09-09 | 北汽福田汽车股份有限公司 | Pre-charging device and method of electric automobile |
| CN209592234U (en) * | 2019-01-11 | 2019-11-05 | 协同能源科技股份有限公司 | A kind of cell equalization compensation device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557915A (en) * | 2020-11-30 | 2021-03-26 | Oppo广东移动通信有限公司 | Electric quantity detection circuit, electric quantity detection method and electronic equipment |
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Application publication date: 20200721 |