CN112531834A - Battery pack charging and discharging control system and method - Google Patents

Battery pack charging and discharging control system and method Download PDF

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Publication number
CN112531834A
CN112531834A CN202011358284.3A CN202011358284A CN112531834A CN 112531834 A CN112531834 A CN 112531834A CN 202011358284 A CN202011358284 A CN 202011358284A CN 112531834 A CN112531834 A CN 112531834A
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CN
China
Prior art keywords
voltage
charging
charge
battery cell
battery pack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011358284.3A
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Chinese (zh)
Inventor
徐英君
何俐鹏
王敏
顾大朋
钟磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Vmhstar Technology Co ltd
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Hangzhou Vmhstar Technology Co ltd
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Publication date
Application filed by Hangzhou Vmhstar Technology Co ltd filed Critical Hangzhou Vmhstar Technology Co ltd
Priority to CN202011358284.3A priority Critical patent/CN112531834A/en
Publication of CN112531834A publication Critical patent/CN112531834A/en
Pending legal-status Critical Current

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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
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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

Abstract

The present application relates to a battery pack charge and discharge control system and method. The system comprises: a battery pack in which a plurality of cells are connected in series; the charge and discharge management circuit is connected with the single battery cell in parallel; and the controller is connected with the charge and discharge management circuit and is used for controlling the charge and discharge of a single battery cell. By adopting the method, the charging and discharging power of the battery pack can be improved.

Description

Battery pack charging and discharging control system and method
Technical Field
The application relates to the technical field of energy storage control, in particular to a battery pack charging and discharging control system and method.
Background
With the development of energy storage technology, more and more devices use commercial power and batteries to supply power simultaneously; for example, the data center equipment room must ensure the continuity of power supply of the electrical equipment and the safety of the power supply system, so the information center equipment room of the data center is configured with a UPS (uninterruptible power supply system), and when the power supply of the utility power is interrupted or the like, the UPS provides stable, clean and continuous power for the electrical equipment in the data center equipment room by using the electric energy in the backup lithium battery system matched with the UPS.
Based on the above application conditions, the lithium battery pack system must be in a full-power floating state for a long time (in case of abnormal commercial power, the lithium battery pack system can respond to the demand of the electric equipment at full power); however, the lithium battery has a special voltage platform characteristic, especially, the lithium iron phosphate battery, at the end of charging (when the battery is charged fully), the voltage of the lithium battery can rise rapidly along with the increase of the internal resistance of the battery core, and at this time, the main circuit must provide a protection device to cut off the charging and discharging circuit to prevent the lithium battery from being charged and exploded (lithium battery pack overshoot protection).
However, due to the use condition of the conventional uninterruptible power supply system and the characteristics of the lithium batteries, the multi-string lithium battery pack system cannot be charged and discharged according to 100% of the power of the lithium battery pack when in use, and the lithium battery pack may be charged and discharged according to only 50% of the power due to the limitation of the protection device.
Disclosure of Invention
In view of the above, it is necessary to provide a battery pack charge and discharge control system and method capable of improving the charge and discharge power of the battery pack.
A battery pack charge and discharge control system, the system comprising:
a battery pack in which a plurality of cells are connected in series;
the charge and discharge management circuit is connected with the single battery cell in parallel;
and the controller is connected with the charge and discharge management circuit and is used for controlling the charge and discharge of a single battery cell.
In one embodiment, the battery pack charge/discharge control system further includes: and the charging equipment is connected with the battery pack, the charging equipment is in communication connection with the controller, and the controller controls the charging current and the charging voltage of the battery pack to the charging equipment.
In one embodiment, the battery pack charge/discharge control system further includes: and the electric equipment is connected with the battery pack.
A lithium battery pack charge-discharge control method, comprising:
the controller monitors the voltage of each battery cell of the battery pack in the charging process;
when the voltage of the battery cell with the highest voltage is greater than a first preset value, controlling the charging equipment to stop charging;
and when the voltage of the cell with the highest voltage is smaller than a second preset value and the voltage of the cell with the lowest voltage is larger than the monomer overcharge protection recovery voltage, controlling the charging equipment to charge the battery pack through a first preset current value.
In one embodiment, when the voltage of the highest-voltage cell is less than a second preset value and the voltage of the lowest-voltage cell is greater than a cell overcharge protection recovery voltage, after controlling the charging apparatus to charge the battery pack by using a first preset current value, the method includes: and when the voltage of the battery cell with the highest voltage is greater than a first preset value, controlling the charging equipment to stop charging, and controlling the charging and discharging management circuit to stop working.
In one embodiment, the lithium battery pack charge and discharge control method further includes: and when the voltage difference between the highest-voltage battery cell and the lowest-voltage battery cell is smaller than a third preset value and the voltage of the highest-voltage battery cell is larger than a fourth preset value, controlling the charge and discharge management circuit to stop working.
In one embodiment, the lithium battery pack charge and discharge control method further includes: when the voltage of the battery cell at the tail end of the positive electrode is greater than a fourth preset value, and the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is greater than a fifth preset value, controlling the charge and discharge management circuit to work; when the voltage of the battery cell at the tail end of the anode is lower than the balance starting voltage, controlling the charge and discharge management circuit to stop working; and when the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is smaller than a third preset value, and the voltage of the battery cell at the tail end of the positive electrode is larger than a balance starting voltage, controlling the charge and discharge management circuit to stop working.
According to the battery pack charging and discharging control system and method, the charging and discharging management circuit connected with the single battery cell in parallel is arranged, the protection device of the main loop is removed, the cost of the system is reduced, meanwhile, when the battery pack is normally charged in a floating mode, the voltage of all the battery cells can be controlled to be always kept in a uniform range (such as 3.40V-3.45V) through interaction between the discharging resistance circuit of the battery cell and charging equipment, the battery cell cannot reach the upper limit value during charging every time to trigger monomer overcharge protection, and therefore charging and discharging of the battery pack according to 100% of power of the battery pack can be achieved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional lithium battery pack charge and discharge control system;
FIG. 2 is a schematic diagram of a battery pack charge/discharge control system according to an embodiment;
fig. 3 is a schematic flow chart of a battery pack charge and discharge control method in one embodiment.
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.
As shown in FIG. 1, the lithium battery charging and discharging control system comprises a lithium battery pack and a battery detection device&The battery pack comprises a plurality of battery cells which are respectively battery Cell cellsnCelln-1… …, Cell2And Cell1Detection of battery&The battery cell equalization module is used for acquiring the voltage of each battery cell through the voltage acquisition unit 002, the controller is used for charging the lithium battery pack according to the voltage control charging equipment of the battery cells, the protection device is arranged on the charging and discharging main loop of the lithium battery pack, the lithium battery charging and discharging control system must be in a full-charge floating charging state under the normal condition, the lithium battery is easily charged and exploded, and therefore when the voltage of the lithium battery is larger than the upper limit value of the voltage, the charging loop must be cut off through the protection device, and the safety of the lithium battery pack is ensured. However, as long as the voltage of one of the battery cells reaches the upper limit value, the lithium battery charging and discharging control system triggers the protection device to cut off the charging loop, and at this time, the lithium battery pack may only realize 50% of power charging and discharging; the protection device is a switch composed of a contactor, an MOS tube and a relayThe structure is high in cost, and the protection device is particularly easy to damage due to the fact that the long-term power level is switched into the main loop and switched out of the main loop in the subsequent use process, so that the later maintenance cost is increased, in short, the cost of the lithium battery charging and discharging control system is increased due to the use of the protection device, and the stability of the system is reduced.
In one embodiment, as shown in fig. 2, there is provided a battery pack charge and discharge control system, the system including: a battery pack 110 in which a plurality of cells are connected in series; a charge and discharge management circuit 120 connected in parallel with the single cell; and the controller 130 is connected to the charge and discharge management circuit 120 and is configured to control charging and discharging of a single battery cell.
The battery pack 110 includes a plurality of cells, each of which is a CellnCelln-1… …, Cell2And Cell1. The charge and discharge management circuit 120 includes battery detection&The battery cell balancing module comprises a single battery cell balancing module and a plurality of discharging resistance circuits, each discharging resistance circuit comprises a resistor R and a switch SW, each battery cell corresponds to one discharging resistance circuit, and the battery detection is performed&The single battery cell balancing module collects the voltage of a single battery cell, when the voltage of the single battery cell reaches or exceeds an upper limit management threshold value, the single battery cell corresponding switch SW is controlled to be closed, the single battery cell management circuit is triggered to work to carry out voltage lifting control on the battery cell, the time of the battery cell reaching an upper limit protection point is prolonged for a long time through an algorithm, and the single battery cell can not reach the upper limit protection point by considering the discharge of a load and a system; and if the voltage of the single battery cell management circuit fails to be restrained in the voltage lifting, the voltage of the single battery cell continues to be lifted, and when the voltage of the battery cell with the highest voltage reaches or exceeds the upper limit value, the controller controls the charging equipment to stop charging. The battery in this embodiment is a chargeable and dischargeable battery, such as a lithium battery.
Above-mentioned group battery charge-discharge control system, through setting up the charge-discharge management circuit who connects in parallel with single electric core, and the protection device of major loop has been removed, the cost of system has been reduced, the stability of the long-term maintenance-free work of system has been improved greatly, simultaneously, when normally floating charging, can pass through the mutual of the discharge resistance circuit of electric core and battery charging outfit, the voltage that can control all electric cores keeps always between a unified scope (like 3.40V to 3.45V), can not charge at every turn and let electric core reach the upper limit protection value and trigger the monomer overcharge protection, consequently, can realize that the group battery charges and discharges according to its 100% power.
In one embodiment, the battery pack charge/discharge control system further includes: a charging device 140 connected to the battery pack 110, the charging device 140 being communicatively connected to the controller 130, the controller 130 controlling a charging current and a charging voltage of the battery pack 110 by the charging device 140. The controller 130 may adjust the magnitude of the charging current and the charging voltage, for example, the controller 130 controls the charging current of the charging device 140 to be 0.5A.
In one embodiment, the battery pack charge/discharge control system further includes: and a power consumer 150 connected to the battery pack 110. The powered device 150 may be a powered device in a data center room.
According to the battery pack charging and discharging control system, the protection device of the main loop is deleted, the charging and discharging power is not affected, power devices are reduced, and the reliability index of the whole system is improved; the system is realized through unit modularization, does not have an integral complex control unit, and is convenient and quick to maintain.
All or part of each module in the battery pack charging and discharging control system can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 3, there is provided a lithium battery pack charge and discharge control method, including:
and S210, monitoring the voltage of each battery cell of the battery pack in the charging process by the controller.
And S220, controlling the charging equipment to stop charging when the voltage of the battery cell with the highest voltage is greater than a first preset value.
The first preset value can be 3.65V, and different first preset values are set according to different upper limit values of the battery.
And S230, when the voltage of the cell with the highest voltage is smaller than a second preset value and the voltage of the cell with the lowest voltage is larger than the monomer overcharge protection recovery voltage, controlling the charging equipment to charge the battery pack through a first preset current value.
The second preset value may be 3.55V, and the second preset value is the highest safety value of the cell. The cell overcharge protection recovery voltage may be 3.34V, the second preset value is greater than the cell overcharge protection recovery voltage, the first preset current value may be 0.5A, and the first preset current value is a small safety current.
The lithium battery pack charging and discharging control method comprises the steps of monitoring the voltage of a single battery cell in real time, starting forbidden charging of charging equipment when the voltage of the battery cell with the highest voltage exceeds the upper limit value, enabling the voltage of the battery cell with the highest voltage to be smaller than the safety value, enabling the voltage of the battery cell with the lowest voltage to be larger than the monomer overcharge protection recovery voltage, charging by adopting a first preset current value, realizing small-current charging of the lithium battery pack, prolonging the equalization time, reducing the equalization error, reducing the risk of equalization error and error equalization, controlling the voltages of all series-connected battery cells in a module within 20mV under certain conditions, avoiding triggering monomer charging protection, and increasing the reliability of the system.
In one embodiment, when the voltage of the highest-voltage cell is less than a second preset value and the voltage of the lowest-voltage cell is greater than a cell overcharge protection recovery voltage, after controlling the charging apparatus to charge the battery pack by using a first preset current value, the method includes: and when the voltage of the battery cell with the highest voltage is greater than a first preset value, controlling the charging equipment to stop charging, and controlling the charging and discharging management circuit to stop working.
In this embodiment, after the battery pack is charged with a small current, if the voltage of the highest-voltage battery cell reaches the upper limit value, the charging device is controlled to stop charging, so as to ensure the safety of the battery pack.
In one embodiment, the lithium battery pack charge and discharge control method further includes: and when the voltage difference between the highest-voltage battery cell and the lowest-voltage battery cell is smaller than a third preset value and the voltage of the highest-voltage battery cell is larger than a fourth preset value, controlling the charge and discharge management circuit to stop working.
Wherein the third preset value can be 20mV, and the fourth preset value can be 3.4V. In this embodiment, the voltage control of all series connection electric cores in the module is within 20mV, avoids triggering monomer charge protection, increases the reliability of system.
In one embodiment, the lithium battery pack charge and discharge control method further includes: when the voltage of the battery cell at the tail end of the positive electrode is greater than a fourth preset value, and the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is greater than a fifth preset value, controlling the charge and discharge management circuit to work; when the voltage of the battery cell at the tail end of the anode is lower than the balance starting voltage, controlling the charge and discharge management circuit to stop working; and when the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is smaller than a third preset value, and the voltage of the battery cell at the tail end of the positive electrode is larger than a balance starting voltage, controlling the charge and discharge management circuit to stop working.
The first preset value may be 3.65V, the second preset value may be 3.55V, the third preset value may be 20mV, the fourth preset value may be 3.4V, the fifth preset value may be 30mV, and the equilibrium turn-on voltage may be 3.45V. In this embodiment, by setting the on-condition and the off-condition of the charge and discharge management circuit, the triggering of the monomer charge protection can be avoided, and further, the frequent control of the start or stop of the charging device can be avoided, and the reliability of the system can be increased.
In the charge and discharge control method for the lithium battery pack in the embodiment, in the subsequent development process, the existing main circuit of the system is used for judging and controlling and adjusting the system to be controlled by a single battery cell, the difference of the system is not considered in the subsequent system scheme stage, the subsequent system is convenient to realize as building blocks under the condition that the single battery cell is not controlled by the single battery cell, the use scene of a user is not considered, the system scheme is simplified and modularized, and the development period of the whole lithium battery pack system is greatly shortened.
It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
For specific limitations of the battery pack charging and discharging control method, reference may be made to the above limitations of the battery pack charging and discharging control system, which are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A battery pack charge and discharge control system, the system comprising:
a battery pack in which a plurality of cells are connected in series;
the charge and discharge management circuit is connected with the single battery cell in parallel;
and the controller is connected with the charge and discharge management circuit and is used for controlling the charge and discharge of a single battery cell.
2. The system of claim 1, further comprising:
and the charging equipment is connected with the battery pack, the charging equipment is in communication connection with the controller, and the controller controls the charging current and the charging voltage of the battery pack to the charging equipment.
3. The system of claim 1, further comprising: and the electric equipment is connected with the battery pack.
4. A lithium battery pack charge-discharge control method is characterized by comprising the following steps:
the controller monitors the voltage of each battery cell of the battery pack in the charging process;
when the voltage of the battery cell with the highest voltage is greater than a first preset value, controlling the charging equipment to stop charging;
and when the voltage of the cell with the highest voltage is smaller than a second preset value and the voltage of the cell with the lowest voltage is larger than the monomer overcharge protection recovery voltage, controlling the charging equipment to charge the battery pack through a first preset current value.
5. The method of claim 4, wherein after controlling the charging device to charge the battery pack with the first preset current value when the voltage of the highest-voltage cell is less than the second preset value and the voltage of the lowest-voltage cell is greater than the cell overcharge protection recovery voltage, the method comprises:
and when the voltage of the battery cell with the highest voltage is greater than a first preset value, controlling the charging equipment to stop charging, and controlling the charging and discharging management circuit to stop working.
6. The method of claim 4, further comprising:
and when the voltage difference between the highest-voltage battery cell and the lowest-voltage battery cell is smaller than a third preset value and the voltage of the highest-voltage battery cell is larger than a fourth preset value, controlling the charge and discharge management circuit to stop working.
7. The method of claim 4, further comprising:
when the voltage of the battery cell at the tail end of the positive electrode is greater than a fourth preset value, and the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is greater than a fifth preset value, controlling the charge and discharge management circuit to work;
when the voltage of the battery cell at the tail end of the anode is lower than the balance starting voltage, controlling the charge and discharge management circuit to stop working;
and when the voltage difference between the battery cell at the tail end of the positive electrode and the battery cell with the lowest voltage is smaller than a third preset value, and the voltage of the battery cell at the tail end of the positive electrode is larger than a balance starting voltage, controlling the charge and discharge management circuit to stop working.
CN202011358284.3A 2020-11-27 2020-11-27 Battery pack charging and discharging control system and method Pending CN112531834A (en)

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Citations (6)

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US20120112703A1 (en) * 2010-11-04 2012-05-10 O2 Micro, Inc. System and Method for Managing a Battery
CN106208235A (en) * 2016-08-18 2016-12-07 联方云天科技(北京)有限公司 The forecast Control Algorithm that a kind of lithium cell charging passively equalizes
CN111033933A (en) * 2018-10-30 2020-04-17 Oppo广东移动通信有限公司 Charging control device, equipment to be charged and charging control method
CN111211587A (en) * 2018-11-21 2020-05-29 联正电子(深圳)有限公司 Equalizing circuit, charging device and energy storage device
CN112104043A (en) * 2020-09-22 2020-12-18 杭州微慕科技有限公司 Lithium battery equalization control circuit with charging and power supplementing functions and control method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101471460A (en) * 2007-12-28 2009-07-01 深圳市比克电池有限公司 Method for equilibrium control of battery set and battery set charging method
US20120112703A1 (en) * 2010-11-04 2012-05-10 O2 Micro, Inc. System and Method for Managing a Battery
CN102468656A (en) * 2010-11-04 2012-05-23 凹凸电子（武汉）有限公司 Charging control device, method and battery management system
CN106208235A (en) * 2016-08-18 2016-12-07 联方云天科技(北京)有限公司 The forecast Control Algorithm that a kind of lithium cell charging passively equalizes
CN111033933A (en) * 2018-10-30 2020-04-17 Oppo广东移动通信有限公司 Charging control device, equipment to be charged and charging control method
CN111211587A (en) * 2018-11-21 2020-05-29 联正电子(深圳)有限公司 Equalizing circuit, charging device and energy storage device
CN112104043A (en) * 2020-09-22 2020-12-18 杭州微慕科技有限公司 Lithium battery equalization control circuit with charging and power supplementing functions and control method thereof

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