CN113922455B - Energy transfer type battery cell voltage management circuit - Google Patents
Energy transfer type battery cell voltage management circuit Download PDFInfo
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- CN113922455B CN113922455B CN202111204763.4A CN202111204763A CN113922455B CN 113922455 B CN113922455 B CN 113922455B CN 202111204763 A CN202111204763 A CN 202111204763A CN 113922455 B CN113922455 B CN 113922455B
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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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- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an energy transfer type battery cell voltage management circuit which is used for managing a battery pack comprising a plurality of battery cells connected in series, wherein the battery pack is divided into a plurality of battery cells, each battery cell comprises a plurality of battery rows connected in series, each battery row comprises a plurality of battery cells, the management circuit comprises a transformer, a plurality of inductors, a plurality of energy storage capacitors and a plurality of switch tubes, the transformer is provided with a plurality of primary windings, two ends of secondary windings of the transformer are respectively connected with the anode and the cathode of the battery pack through the switch tubes, and the plurality of primary windings are respectively connected in parallel with two ends of the plurality of battery cells through different switch tubes; two ends of each battery row are connected with an inductor in parallel through a switch tube, and an energy storage capacitor is connected in series between adjacent inductors connected with the battery rows in parallel in each battery unit. The energy transfer type battery cell voltage management circuit improves the inconsistency of battery cells and prolongs the service life of the battery.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to an energy transfer type battery cell voltage management circuit.
Background
The service life of the battery pack is seriously affected by the inconsistency of the batteries, and the battery pack is obviously inferior to the single performance in the aspects of cycle life, capacity utilization rate and the like according to the wooden barrel effect. Along with the recycling of the battery pack, the inconsistency of the monomers is aggravated, the grouping characteristic of the lithium ion battery is further worsened, and the condition of overcharging and overdischarging of a few monomers is extremely easy to occur, so that the performance of the battery pack is greatly attenuated, and even malignant accidents such as combustion, explosion and the like are possible under extreme conditions, thereby greatly obstructing the application and popularization of the lithium ion battery.
And the battery pack is subjected to balanced control, namely, in the recycling process, the energy of the single body in the battery pack is balanced in time in an energy consumption or transfer mode, so that the probability of overcharge and overdischarge of the single body is reduced, the adverse effect of the difference of discharge depths on the battery pack is eliminated, the overall energy utilization rate of the battery pack is improved, and the cycle life of the battery is prolonged.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an energy transfer type cell voltage management circuit that can improve battery non-uniformity and extend battery life.
An energy transfer type battery cell voltage management circuit for managing a battery pack including a plurality of battery cells connected in series, the battery pack being divided into a plurality of battery cells, each battery cell including a plurality of battery rows connected in series, the battery rows including a plurality of battery cells,
the management circuit comprises a transformer, a plurality of inductors, a plurality of energy storage capacitors and a plurality of switching tubes, wherein the transformer is provided with a plurality of primary windings, two ends of a secondary winding of the transformer are respectively connected with the anode and the cathode of the battery pack through the switching tubes, and the plurality of primary windings are respectively connected with two ends of the plurality of battery units in parallel through different switching tubes;
two ends of each battery row are connected with an inductor in parallel through a switch tube, and an energy storage capacitor is connected in series between adjacent inductors connected with the battery rows in parallel in each battery unit.
Furthermore, the management circuit further comprises a plurality of equalizing capacitors and a plurality of control switches, and adjacent battery cells of the battery row are respectively connected with one equalizing capacitor in parallel through the two control switches.
Furthermore, the management circuit further comprises a plurality of filter capacitors, and two ends of each battery cell in the battery bank are connected in parallel with one filter capacitor.
Further, the number of battery rows in the plurality of battery cells is equal, and the number of battery cells in the plurality of battery rows is equal.
Further, the battery unit is provided with two battery rows.
Furthermore, an energy storage capacitor and the adjacent inductor are connected in series between the adjacent inductors to form the CUK converter.
Further, the battery row is provided with two battery cells.
According to the energy transfer type battery single voltage management circuit, the transformer is used for balancing, so that the quick balancing of any single battery in the battery pack can be realized, the control mode is simple, the balancing current is large, the balancing efficiency is high, the structure is easy to expand, the number of primary windings of the transformer is greatly reduced, and the consistency control difficulty of the primary windings of the transformer is greatly reduced. The equalization circuit of the CUK converters performs equalization discharging and charging simultaneously when the batteries are equalized, the equalization speed is high, the equalization energy transfer efficiency is high, the inductance in each CUK converter is equalized by the voltage of the battery row formed by connecting a plurality of single batteries in series, and therefore the voltage difference is increased, and the defect that when the voltage difference of each single battery in the battery pack is smaller, the equalization current is small is overcome. The switch capacitance method is used for managing the active equalization of the adjacent two batteries, and has the main function of judging the charge state difference between the adjacent two batteries, and the equalization module transfers the redundant electric quantity of the battery with high voltage to the battery with low voltage through the action of a transfer station of the capacitor in a switch power supply mode according to the result of an equalization algorithm, so that the battery capacity is maximized. The scheme only needs a switch and a capacitor to complete the construction of the equalization circuit, and has the advantages of simple structure and almost no energy loss in the equalization process. Through the combination of the equalization methods, the inconsistency of the battery cells is improved, and the service life of the battery is prolonged.
Drawings
Fig. 1 is a circuit diagram of an energy transfer type cell voltage management circuit of an embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an energy transfer type battery cell voltage management circuit for managing a battery cell B including a plurality of battery cells connected in series 1 ～B n Is divided into a plurality of battery cells 110, each battery cell 110 includes a plurality of battery rows 112 connected in series, and the battery rows 112 include a plurality of battery cells. The management circuit comprises a transformer T and a plurality of inductors L 1 ～L n/2 A plurality of energy storage capacitors C L1 ～C Ln/4 And a plurality of switch tubes S 1-1 ～S 1-n/2 、S、S N1 ～S Nn/4 The transformer T has a plurality of primary windings N 1-1 ～N 1-n/4 Secondary winding N of transformer T 2 Two ends of the battery pack are respectively connected with the anode and the cathode of the battery pack through a switch tube S, and a plurality of primary windings N 1-1 ～N 1-n/4 Respectively through different switching tubes S N1 ～S Nn/4 And are connected in parallel to both ends of the plurality of battery cells 110. Two ends of each battery row 112 pass through a switch tube S 1-1 ～S 1-n/2 And an inductor is connected in parallel, and an energy storage capacitor C is connected in series between adjacent inductors connected in parallel with the battery row 112 in each battery unit 110 L1 ～C Ln/4 。
In this embodiment, the management circuit further includes a plurality of equalizing capacitors C B1 ～C Bn/2 And a plurality of control switches S 1 ～S n Adjacent battery cells B of the battery row 112 1 ～B n Respectively through two control switches S 1 ～S n And is connected in parallel with an equalizing capacitor C B1 ～C Bn/2 。
In this embodiment, the management circuit further includes a plurality of filter capacitors C 1 ～C n The two ends of each battery cell in the battery row 112 are connected in parallel with a filter capacitor C 1 ～C n . Specifically, the number of battery rows 112 in the plurality of battery cells 110 is equal, and the number of battery cells in the plurality of battery rows 112 is equal. The battery cell 110 has two battery rows 112 therein. Adjacent inductance L 1 ～L n/2 An energy storage capacitor C is connected in series between L1 ～C Ln/4 Adjacent to inductance L 1 ～L n/2 Constitute a CUK transformer. The battery row 112 has two battery cells B therein 1 ～B n 。
This is described in detail below in conjunction with fig. 1.
Taking an example of a serial module of n single batteries, according to the scheme of the invention, every 4 single batteries form 1 battery unit 110, and the serial module is divided into n/4 units, every 2 single batteries form 1 battery row 112, and every battery unit 110 is formed by 2 battery rows 112. For example cell B 1 ～B 4 Series connection of 1 st cell and cell B n-3 ～B n The n/4 th battery unit is formed in series. The 4 cells in each cell unit are divided into 2 small cells (cell rows) in a bisecting way, each cell row is composed of 2 cells, and the adjacent 2 cell rows share 1 CUK (Care Unit Skin, cuk chopper Circuit) converter equalization circuit. 2 single batteries in each battery row share 1 capacitor as an equalizing capacitor; the battery unit consisting of 4 battery units formed by every 2 battery rows is balanced with the whole battery pack by configuring 1 transformer.
Wherein the switching tube S 1-1 ～S 1-n/2 、S、S N1 ～S Nn/4 And control switch S 1 ～S n Is a power switch tube. Filter capacitor C connected in parallel with each battery cell 1 ～C n The filter capacitor is a high-frequency filter capacitor and is used for filtering clutter in the energy transmission process. N (N) 1-1 ～N 1-n/4 Primary winding for transformer T balancing, N 2 And a secondary winding for transformer equalization. L (L) 1 ～L n/2 And C L1 ～C Ln/4 The inductance and the capacitance of the CUK converter equalizing circuit are respectively. C (C) B1 ～C Bn/2 And the balance capacitance is equal capacitance.
The equalization principle of the circuit of the invention is that firstly, the transformer is utilized to complete the equalization between each battery unit 110 and the whole battery pack, then the CUK converter is utilized to complete the equalization between the adjacent 2 battery rows, and finally, the equalization capacitor is utilized to complete the equalization between the 2 battery monomers in each battery row.
The specific equalization process of the present invention will now be described in detail with reference to the 1 st cell 110 formed by the series connection of the first 4 cells B1 to B4 in the battery pack, and the equalization steps are as follows:
in the first step, the equalization between the 1 st battery cell 110 and the entire battery pack is accomplished using transformer T equalization. The specific equalization process is respectively completed in the following 2 cases:
in the first case, assuming that the 1 st cell has a higher voltage than the other cells in the battery, the equalization step is as follows:
step 1, power switch tube S N1 Conducting, switching on 1 st cell and primary winding N of balanced transformer connected in series 1-1 Part of the electric quantity of the battery unit is stored in the primary winding N 1-1 Is a kind of medium. The current direction is as in i 1 。
Step 2, power switch tube S N1 The power switch tube S is turned off, and the whole battery pack and the secondary winding N which is in balance with the transformer connected in series with the battery pack are turned on 2 The last step is stored to the primary winding N 1-1 Is coupled to the secondary winding N 2 In the secondary winding N 2 The electric quantity in (a) flows to the whole battery pack. The current direction is as in i 2 。
In the second case, assuming that the 1 st cell has a lower voltage than the other cells in the battery, the equalization step is as follows:
step 1, a power switch tube S is conducted, and the whole battery module and a secondary winding N which is in balance with a transformer connected in series with the battery module are connected 2 Part of the electric quantity of the whole battery module is stored in the secondary winding N 2 Is a kind of medium. The current direction is shown as i in the figure 3 。
Step 2, the power switch tube S is turned off, and the power switch tube S N1 Conducting, switching on 1 st cell and primary winding N of balanced transformer connected in series 1-1 The last step is stored to the secondary winding N 2 Is coupled to primary winding N 1-1 In the primary winding N 1-1 And then transferred to the 1 st battery cell. The current direction is shown as i in the figure 4 。
And secondly, after the balance between the 1 st battery unit and the battery pack is finished through the plurality of times of circulation in the first step, the balance of the transformer is closed, and the balance of the CUK converter is started to finish the balance between 2 battery rows in the battery unit.
Let it now be assumed that 2 battery cells B in the 1 st battery row 1 ～B 2 2 battery cells B compared with the 2 nd small battery cell 3 ～B 4 The cell voltage is higher and the equalization steps are as follows: see fig. 1.
Step 1, power switch tube S 1-1 MOS tube Q in (B) 1-1 And conducting to close the input/output loop. Power switch tube S 1-2 Body diode D in (a) 1-2 And (5) reversely cutting off. At this time, 2 battery cells B in the 1 st battery row 1 ～B 2 Current I flowing out 1 Inductance L is made 1 Storing energy; energy storage capacitor C L1 Discharge current I 2 Inductance L is made 2 Energy is stored and is directed to 2 battery monomers B of the 2 nd battery row 3 ～B 4 The battery charges and transfers the electric quantity. The discharge of the 1 st cell line and the charge of the 2 nd cell line are performed simultaneously, and energy flows bi-directionally.
Step 2, power switch tube S 1-1 MOS tube Q in (B) 1-1 Cut-off, power switch tube S 1-2 Body diode D in (a) 1-2 The input/output loop is closed by forward bias and conduction. At this time, 2 battery cells B in the 1 st battery row 1 ～B 2 And inductance L 1-1 Induced electromotive force adding to energy storage capacitor C L1 Charging, charging current I 3 Energy storage capacitor C L1 Energy storage, inductance L 2 Releasing energy, its discharge current I 4 2 battery cells B of the 2 nd battery row 3 ～B 4 The battery charges and transfers the electric quantity. The discharge of the 1 st cell line and the charge of the 2 nd cell line are performed simultaneously, and energy flows bi-directionally.
As can be seen from the above steps 1 and 2, no matter in the power switch tube S 1-1 MOS transistor Q of (2) 1-1 During the on or off period of (2) the 1 st battery row can transfer energy to the 2 nd battery row, and the energy storage capacitor C L1 In the circuit is an energy storage element. In power switch tube S 1-1 MOS transistor Q of (2) 1-1 The current I of the 1 st cell row 3 So that the energy storage capacitor C L1 Charging and storing energy; in power switch tube S 1-1 MOS transistor Q of (2) 1-1 During the conduction period of (2), the energy storage capacitor C L1 The discharge releases energy to the 2 nd cell line.
If the number of the battery cells B in the 1 st battery row is 2 1 ～B 2 2 battery monomers B compared with the 2 nd battery row 3 ～B 4 The cell voltage is lower and the equalization step is similar to steps 1 and 2 above。
And thirdly, after the second step is repeated for a plurality of times, the equalization between the 1 st battery row and the 2 nd small battery row is finished, the equalization of the CUK converter is closed, and the equalization capacitor in each battery row is opened to finish the equalization between the 2 internal battery monomers.
The 1 st cell row will be described as an example of balancing. The specific equalization process is as follows:
battery monomer B in 1 st battery row 1 ～B 2 One of the cells must have a relatively high voltage, and it is now assumed that cell B 1 Compared with battery cell B 2 The voltage is higher. Let power switch tube S 1 Conducting and switching on battery cell B 1 And equalizing capacitance C B1 Part of the electric quantity of the battery unit is stored in the equalizing capacitor C B1 Is a kind of medium. The current direction is shown as i in the figure 5 。
Step 2, power switch tube S 1 Closing, power switch tube S 2 The MOS tube is turned off and the body diode is turned on to turn on the battery cell B 2 Equalizing capacitor C connected in series with it B1 Equalizing capacitance C B1 The electric quantity stored in the last step is transferred to the battery cell B 2 Is a kind of medium. The current direction is shown as i in the figure 6 。
And through the third step of circulation for several times, the equalization among the 2 battery monomers in the 1 st battery row is completed, and finally, the active equalization of the capacitor is closed, and the equalization of the whole series battery pack is completed.
The total equalization strategy is that firstly, the transformer equalization is utilized to complete the active equalization of the electric quantity transfer between each battery unit and the whole battery pack, then the CUK converter is utilized to complete the active equalization of the electric quantity transfer between the adjacent 2 battery rows, and finally the equalization capacitor is utilized to complete the active equalization of the electric quantity transfer between the 2 battery monomers in each battery row.
The transformer balancing scheme can realize the balancing of a plurality of battery cells at the same time, so that the terminal voltage of all the battery cells is finally close to the average voltage level. The topology has the advantages of simple operation and easy control, but when the number of the battery monomers is large, the multi-winding transformer is difficult to design, the consistency of each winding at the primary side is difficult to ensure, and the disadvantage of difficult expansion exists. The invention divides the whole battery unit into a plurality of battery units, uses the battery units as units to be connected with the primary winding of the transformer, and after the transformer is balanced in a grouping way, the number of the primary windings of the transformer is greatly reduced, and uses four battery units as an example, the number of the primary windings of the transformer is 1/4 of the original number, so that the consistency control difficulty of the primary windings of the transformer is greatly reduced.
The equalization circuit of the CUK converter performs equalization discharging and charging simultaneously when the battery is equalized, the equalization speed is high, the equalization energy transfer efficiency is high, but only 2 adjacent battery cells can be equalized generally, the equalization principle is that the voltage difference between the battery cells is utilized for energy transfer equalization, so that when the voltage difference of the battery cells is smaller, the equalization current is small, and the equalization efficiency is very low. After the series single batteries are grouped, the inductance in each CUK converter equalizes the voltage of the battery row formed by connecting the single batteries in series, and taking two single batteries as an example, the voltage equalized by the inductance is 2 times of the voltage of each single battery, which is equivalent to amplifying the voltage difference between the single batteries by 2 times, so that the voltage difference is increased, and the defect that when the voltage difference of each single battery in the battery pack is smaller, the equalizing current is small is overcome.
According to the energy transfer type battery single voltage management circuit, the transformer is used for balancing, so that the quick balancing of any single battery in the battery pack can be realized, the control mode is simple, the balancing current is large, the balancing efficiency is high, the structure is easy to expand, the number of primary windings of the transformer is greatly reduced, and the consistency control difficulty of the primary windings of the transformer is greatly reduced. The equalization circuit of the CUK converters performs equalization discharging and charging simultaneously when the batteries are equalized, the equalization speed is high, the equalization energy transfer efficiency is high, the inductance in each CUK converter is equalized by the voltage of the battery row formed by connecting a plurality of single batteries in series, and therefore the voltage difference is increased, and the defect that when the voltage difference of each single battery in the battery pack is smaller, the equalization current is small is overcome. The switch capacitance method is used for managing the active equalization of the adjacent two batteries, and has the main function of judging the charge state difference between the adjacent two batteries, and the equalization module transfers the redundant electric quantity of the battery with high voltage to the battery with low voltage through the action of a transfer station of the capacitor in a switch power supply mode according to the result of an equalization algorithm, so that the battery capacity is maximized. The scheme only needs a switch and a capacitor to complete the construction of the equalization circuit, and has the advantages of simple structure and almost no energy loss in the equalization process. Through the combination of the equalization methods, the inconsistency of the battery cells is improved, and the service life of the battery is prolonged.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (1)
1. The energy transfer type battery cell voltage management circuit is used for managing a battery pack comprising a plurality of battery cells connected in series, the battery pack is divided into a plurality of battery cells, each battery cell comprises a plurality of battery rows connected in series, and each battery row comprises a plurality of battery cells, and the energy transfer type battery cell voltage management circuit is characterized by comprising a transformer, a plurality of inductors, a plurality of energy storage capacitors and a plurality of switching tubes, wherein the transformer is provided with a plurality of primary windings, two ends of a secondary winding of the transformer are respectively connected with the anode and the cathode of the battery pack through the switching tubes, and the plurality of primary windings are respectively connected with two ends of the plurality of battery cells in parallel through different switching tubes;
two ends of each battery row are connected with an inductor in parallel through a switch tube, and an energy storage capacitor is connected in series between adjacent inductors connected with the battery rows in parallel in each battery unit;
the management circuit also comprises a plurality of equalizing capacitors and a plurality of control switches, wherein adjacent battery cells of the battery row are respectively connected with one equalizing capacitor in parallel through the two control switches;
the management circuit also comprises a plurality of filter capacitors, and two ends of each battery cell in the battery bank are connected in parallel with one filter capacitor;
the number of the battery rows in the plurality of battery units is equal, and the number of the battery monomers in the plurality of battery rows is equal;
the battery unit is provided with two battery rows;
an energy storage capacitor and adjacent inductors are connected in series between the adjacent inductors to form a CUK converter;
the battery row is provided with two battery monomers.
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| CN202111204763.4A CN113922455B (en) | 2021-10-15 | 2021-10-15 | Energy transfer type battery cell voltage management circuit |
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| CN106532829A (en) * | 2016-11-29 | 2017-03-22 | 河南科技大学 | Two-stage balance control circuit, system and policy for charge and discharge of lithium battery packs |
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| CN109720234A (en) * | 2018-12-04 | 2019-05-07 | 深圳众力新能源科技有限公司 | A kind of two-way active equalization device and its system of vehicle mounted dynamic battery group |
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2021
- 2021-10-15 CN CN202111204763.4A patent/CN113922455B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764421A (en) * | 2010-01-15 | 2010-06-30 | 中国科学院电工研究所 | Equalizing equipment for battery units of electric automobile |
| JP2012138979A (en) * | 2010-12-24 | 2012-07-19 | Nippon Soken Inc | Output equalization system of battery pack |
| CN104485703A (en) * | 2014-12-04 | 2015-04-01 | 中国科学院广州能源研究所 | Voltage balancing method and voltage balancing circuit of lithium-ion energy storage battery |
| CN106532829A (en) * | 2016-11-29 | 2017-03-22 | 河南科技大学 | Two-stage balance control circuit, system and policy for charge and discharge of lithium battery packs |
| CN107195994A (en) * | 2017-07-07 | 2017-09-22 | 东莞中汽宏远汽车有限公司 | Active equalization device for battery pack |
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