CN112671076A - Battery pack equalization circuit based on half-bridge converter and control method - Google Patents
Battery pack equalization circuit based on half-bridge converter and control method Download PDFInfo
- Publication number
- CN112671076A CN112671076A CN202110048915.XA CN202110048915A CN112671076A CN 112671076 A CN112671076 A CN 112671076A CN 202110048915 A CN202110048915 A CN 202110048915A CN 112671076 A CN112671076 A CN 112671076A
- Authority
- CN
- China
- Prior art keywords
- battery pack
- bridge
- batteries
- series
- bridge converter
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明公开了一种基于半桥变换器的电池组均衡电路及控制方法，电池组包括若干串联的电池，电池组均衡电路包括控制器、半桥变换单元和高压侧半桥变换器；控制器与半桥变换变换单元的两个开关管、高压侧半桥变换器的两个开关管连接，用于根据电池组内各节电池的电压关系产生PWM信号对所有开关管进行控制，实现整个电池组的均衡管理。本发明有效减少了整个均衡系统的器件数量、成本和体积，提高了均衡系统的模块化能力和可靠性，另外，可以保证均衡电流连续且大小可控，极大的提升了均衡速度和均衡效率，进而最大限度地延长了电池的使用寿命，保证电池组的安全可靠性。
The invention discloses a battery pack equalization circuit and a control method based on a half-bridge converter. The battery pack includes a plurality of batteries connected in series, and the battery pack equalization circuit includes a controller, a half-bridge conversion unit and a high-voltage side half-bridge converter; the controller; It is connected with the two switches of the half-bridge conversion unit and the two switches of the high-voltage side half-bridge converter, and is used to generate PWM signals according to the voltage relationship of each battery in the battery pack to control all the switches to realize the whole battery. Balanced management of groups. The invention effectively reduces the number of components, cost and volume of the entire equalization system, improves the modularization capability and reliability of the equalization system, in addition, can ensure that the equalization current is continuous and controllable in size, and greatly improves the equalization speed and the equalization efficiency , thereby maximizing the service life of the battery and ensuring the safety and reliability of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery pack equalization circuits, in particular to a battery pack equalization circuit based on a half-bridge converter and a control method.
Background
The lithium ion battery is widely applied to the fields of electric automobiles, unmanned aerial vehicles and the like, and the application requirements of high voltage and large capacity are met in a series-parallel connection mode. However, there are some characteristic differences between the individual batteries in the battery pack in terms of capacity, self-discharge rate, internal impedance, etc., and these differences tend to gradually expand over time, which accelerates degradation of the batteries and even causes fire and explosion.
Disclosure of Invention
The invention mainly aims to provide a battery pack equalization circuit based on a half-bridge converter and a control method, aiming at prolonging the service life of a battery monomer to the maximum extent and ensuring the safe and reliable operation of a battery pack.
In order to achieve the above object, the present invention provides a battery pack balancing circuit based on a half-bridge converter, wherein the battery pack includes a plurality of batteries connected in series, and the battery pack balancing circuit includes a controller, a half-bridge conversion unit and a high-voltage side half-bridge converter;
the half-bridge conversion unit comprises two switching tubes connected in series and an independent transformer, every two adjacent batteries connected in series in the battery pack are connected with the two switching tubes connected in series in parallel to form two bridge arms, and the primary side of the independent transformer is respectively connected with the middle points of the two bridge arms to construct the half-bridge conversion unit;
the high-voltage side half-bridge converter comprises an inductor, two switching tubes connected in series and two capacitors connected in series, the two switching tubes connected in series and the two capacitors connected in series are connected in parallel to form two bridge arms, a secondary side of the independent transformer is connected with the inductor in series and then is respectively connected with the middle points of the two bridge arms to form the high-voltage side half-bridge converter, and the output end of the high-voltage side half-bridge converter is connected with the whole battery pack;
the controller is connected with the two switching tubes of the half-bridge conversion unit and the two switching tubes of the high-voltage side half-bridge converter and used for generating PWM signals according to the voltage relation of each battery in the battery pack to control all the switching tubes and achieve balanced management of the whole battery pack.
According to a further technical scheme, the balance between every two adjacent batteries connected in series in the battery pack is realized through the excitation inductance of the independent transformer.
In order to achieve the above object, the present invention further provides a control method of a battery pack balancing circuit based on a half-bridge converter, the method is applied to the battery pack balancing circuit based on the half-bridge converter, and the control method includes the following steps:
the controller acquires the voltage of each battery in the battery pack;
acquiring the voltage difference of the batteries in the battery pack according to the voltage of each battery in the battery pack;
and after the voltage difference of the batteries in the battery pack exceeds a preset threshold value, starting the battery pack balancing circuit based on the half-bridge converter to perform balancing control on the battery pack.
The further technical scheme of the invention is that the step of carrying out balance control on the battery pack by the battery pack balancing circuit based on the half-bridge converter comprises the following steps:
carrying out balance control on two batteries in each half-bridge unit;
and carrying out balance control on each half-bridge unit according to the difference value of the average voltage of the two batteries in each half-bridge unit and the average voltage of the battery pack.
The further technical solution of the present invention is that the step of performing equalization control on two batteries in each half-bridge unit includes:
alternately conducting two switching tubes in each half-bridge unit through a pair of PWM signals in a complementary state, and balancing two batteries in each half-bridge unit by utilizing the excitation inductance of the corresponding independent transformer;
the step of performing equalization control on each half-bridge unit according to the difference between the average voltage of the two batteries in each half-bridge unit and the average voltage of the battery pack comprises the following steps:
and calculating the difference value between the voltage of the two batteries in each half-bridge unit and the average voltage of the battery pack, and controlling the energy exchange between the unbalanced batteries in each half-bridge unit and the whole battery pack according to the difference value to realize the balance between the half-bridge units.
The battery pack equalization circuit based on the half-bridge converter and the control method have the advantages that: the number of devices, the cost and the volume of the whole balancing system are effectively reduced, the modularization capability and the reliability of the balancing system are improved, in addition, the continuous and controllable size of the balancing current can be ensured, the balancing speed and the balancing efficiency are greatly improved, the service life of the battery is further prolonged to the maximum extent, and the safety and the reliability of the battery pack are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a preferred embodiment of a battery pack equalization circuit based on a half-bridge converter according to the present invention;
FIG. 2 is a schematic flow chart illustrating a control method of a battery pack equalization circuit based on a half-bridge converter according to a preferred embodiment of the present invention;
FIGS. 3 and 4 are equivalent circuits of two adjacent batteries in a half-bridge unit when the batteries are balanced;
fig. 5 and 6 are schematic diagrams of equivalent circuits at the time of equalization between half-bridge cells.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Aiming at the defects of large number of equalization circuit devices, complex control, poor practicability and low equalization speed in the prior art, the invention provides the battery pack equalization circuit based on the half-bridge converter, which realizes time-sharing multiplexing of the devices in the equalization process, effectively reduces the number, cost and volume of the whole equalization system, improves the modularization capability and reliability of the equalization system, can ensure continuous and controllable equalization current and greatly improves the equalization speed and equalization efficiency.
Specifically, referring to fig. 1, in the preferred embodiment of the battery pack balancing circuit based on a half-bridge converter of the present invention, the battery pack includes a plurality of batteries connected in series, and the battery pack balancing circuit includes a controller, a half-bridge conversion unit and a high-voltage side half-bridge converter.
The half-bridge conversion unit comprises two switching tubes connected in series and an independent transformer, every two adjacent batteries connected in series in the battery pack are connected with the two switching tubes connected in series in parallel to form two bridge arms, and the primary side of the independent transformer is connected with the midpoints of the two bridge arms respectively to form the half-bridge conversion unit. And every two adjacent batteries connected in series in the battery pack are balanced through the excitation inductance of the independent transformer.
The high-voltage side half-bridge converter comprises an inductor, two switching tubes connected in series and two capacitors connected in series, the two switching tubes connected in series and the two capacitors connected in series are connected in parallel to form two bridge arms, a secondary side of the independent transformer is connected with the inductor in series and then is connected with the middle points of the two bridge arms respectively to form the high-voltage side half-bridge converter, and the output end of the high-voltage side half-bridge converter is connected with the whole battery pack.
The controller is connected with the two switching tubes of the half-bridge conversion unit and the two switching tubes of the high-voltage side half-bridge converter and used for generating PWM signals according to the voltage relation of each battery in the battery pack to control all the switching tubes and achieve balanced management of the whole battery pack.
In the embodiment, every two adjacent batteries in the battery pack, two switching tubes and the primary side of an independent transformer form a half-bridge conversion unit, and the two batteries in the half-bridge conversion unit can be balanced through the excitation inductance of the transformer; the secondary side of each transformer is connected with an inductor in series and then forms a high-voltage side half-bridge converter with two switching tubes and two capacitors, and the output of the high-voltage side half-bridge converter is connected with the whole battery pack. All the switch tubes in the equalization circuit are connected with the controller, and the controller controls all the switch tubes according to the voltage relation of all the batteries in the battery pack, so that the equalization management of the whole battery pack is realized. The embodiment has the advantages of high equalization efficiency, high equalization speed, high equalization precision, simple structure and easy expansion; in the balancing process, time-sharing multiplexing of devices is realized, and the number, cost and volume of the devices of the whole balancing system are effectively reduced.
In the embodiment, every two adjacent batteries connected in series in the battery pack are connected with two switching tubes connected in series in parallel to form two bridge arms, and the primary side of an independent transformer is respectively connected with the midpoints of the two bridge arms to form a half-bridge conversion unit; two switching tubes and two capacitors on the high-voltage side are also connected in parallel to form two bridge arms, and secondary sides of the independent transformers are connected with an inductor in series and then are respectively connected with the middle points of the two bridge arms to form the high-voltage side half-bridge converter.
The controller generates PWM signals according to the voltage relation of each battery in the battery pack to control each switch tube, and therefore the balance management of the whole battery pack is achieved. The equalization process of the battery pack is carried out in two stages: in the first stage, two batteries in each half-bridge unit are balanced by using the excitation inductance of a transformer; in the second stage, the energy exchange between the unbalanced batteries and the battery pack is realized by controlling the half-bridge units, so that the balance among different half-bridge units is realized. The embodiment realizes time-sharing multiplexing of devices in the balancing process, and effectively reduces the number, cost and volume of the devices of the whole balancing system.
The battery pack equalization circuit based on the half-bridge converter has the advantages that: according to the technical scheme, the battery pack comprises a plurality of batteries which are connected in series, and the battery pack balancing circuit comprises a controller, a half-bridge conversion unit and a high-voltage side half-bridge converter; the half-bridge conversion unit comprises two switching tubes connected in series and an independent transformer, every two adjacent batteries connected in series in the battery pack are connected with the two switching tubes connected in series in parallel to form two bridge arms, and the primary side of the independent transformer is respectively connected with the middle points of the two bridge arms to construct the half-bridge conversion unit; the high-voltage side half-bridge converter comprises an inductor, two switching tubes connected in series and two capacitors connected in series, the two switching tubes connected in series and the two capacitors connected in series are connected in parallel to form two bridge arms, a secondary side of the independent transformer is connected with the inductor in series and then is respectively connected with the middle points of the two bridge arms to form the high-voltage side half-bridge converter, and the output end of the high-voltage side half-bridge converter is connected with the whole battery pack; the controller is connected with the two switch tubes of the half-bridge conversion unit and the two switch tubes of the high-pressure side half-bridge converter, and is used for generating PWM signals according to the voltage relation of each battery in the battery pack to control all the switch tubes, so that the balance management of the whole battery pack is realized, the number, cost and volume of devices of the whole balance system are effectively reduced, the modularization capacity and reliability of the balance system are improved, in addition, the balance current can be ensured to be continuous and controllable in size, the balance speed and balance efficiency are greatly improved, the service life of the battery is further prolonged to the maximum extent, and the safety and reliability of the battery pack are ensured.
In order to achieve the purpose, the invention also provides a control method of the battery pack equalization circuit based on the half-bridge converter, and the technical scheme adopted by the control method of the battery pack equalization circuit based on the half-bridge converter mainly comprises the steps that a controller obtains the voltage of each single battery in the battery pack through an A \ D conversion module, then whether the equalization circuit needs to be started or not is judged according to the voltage relation among the single batteries, and when the voltage difference among the batteries in the battery pack exceeds a set maximum threshold value, the battery pack equalization circuit is started.
Specifically, referring to fig. 2, the method for controlling the half-bridge converter-based battery pack balancing circuit according to the present invention is applied to the half-bridge converter-based battery pack balancing circuit, and the method includes the following steps:
in step S10, the controller obtains the voltage of each battery in the battery pack.
And step S20, acquiring the voltage difference of the batteries in the battery pack according to the voltage of each battery in the battery pack.
And step S30, after the voltage difference of the batteries in the battery pack exceeds a preset threshold value, starting the battery pack balancing circuit based on the half-bridge converter to perform balancing control on the battery pack.
The step of carrying out balance control on the battery pack by the battery pack balancing circuit based on the half-bridge converter comprises the following steps:
step S301, performing equalization control on the two batteries in each half-bridge unit.
Step S302, performing equalization control on each half-bridge unit according to a difference between the average voltages of the two batteries in each half-bridge unit and the average voltage of the battery pack.
Specifically, the step of performing equalization control on two batteries in each half-bridge unit includes:
and alternately conducting two switching tubes in each half-bridge unit through a pair of PWM signals in complementary states, and balancing two batteries in each half-bridge unit by utilizing the excitation inductance of the corresponding independent transformer.
The step of performing equalization control on each half-bridge unit according to the difference between the average voltage of the two batteries in each half-bridge unit and the average voltage of the battery pack comprises the following steps:
and calculating the difference value between the voltage of the two batteries in each half-bridge unit and the average voltage of the battery pack, and controlling the energy exchange between the unbalanced batteries in each half-bridge unit and the whole battery pack according to the difference value to realize the balance between the half-bridge units.
The following describes the control method of the half-bridge converter based battery pack balancing circuit according to the present invention in detail with reference to fig. 3 to 6.
The technical scheme adopted by the control method of the battery pack equalizing circuit based on the half-bridge converter mainly comprises the following steps that a controller obtains the voltage of each single battery in a battery pack through an A \ D conversion module, then whether the equalizing circuit needs to be started or not is judged according to the voltage relation among the single batteries, and when the voltage difference among the batteries in the battery pack exceeds a set maximum threshold, the battery pack equalizing circuit is started, wherein the whole equalizing process is divided into two stages:
1. equalization of two adjacent batteries in half-bridge unit
After the battery pack balancing circuit is started, two adjacent batteries in each half-bridge unit are balanced firstly. As shown in fig. 3 and 4, the two switching tubes in each half-bridge unit are alternately turned on by a pair of complementary PWM signals, so that the excitation inductance Lm1-Lmn of each independent transformer can be used to realize the automatic equalization of two adjacent batteries. The balancing stage can balance adjacent batteries in all half-bridge units at the same time, greatly improves the balancing speed, and has the advantages of simple control and high reliability.
2. Equalization between half-bridge cells
After the first equalization stage is completed, voltage equalization is achieved between the two batteries in each half-bridge unit, and then the second stage of equalization is started. At the moment, the controller calculates the difference between the voltage of each single battery and the average voltage of the battery pack, and sorts the balance sequence of the unbalanced batteries according to the difference from large to small.
As shown in fig. 5, it is assumed that the two batteries in the half-bridge unit 1 are the batteries with the highest voltage in the battery pack. The controller will issue PWM signals to control S1, S2, Sn +1 and Sn +2 to release the energy in half bridge unit 1 to the high side half bridge inverter. Because the high-voltage side half-bridge converter is connected with the whole battery pack, the energy in the overvoltage battery is released to the whole battery pack.
As shown in fig. 6, it is assumed that the two batteries in the half-bridge unit 2 are the batteries with the lowest voltage in the battery pack. At this time, the controller will issue PWM signals to control S3, S4, Sn +1, and Sn +2 to discharge the energy in the entire battery pack through the high-side half-bridge inverter to the under-voltage battery in the half-bridge unit 2.
It can be seen that this phase enables energy exchange between the unbalanced cells in each half-bridge cell and the entire battery pack, i.e. enables equalization between the half-bridge cells. Meanwhile, the equalizing current is continuous and controllable in size, and equalizing efficiency and equalizing speed are greatly improved.
The control method of the battery pack equalization circuit based on the half-bridge converter has the advantages that: according to the technical scheme, the controller acquires the voltage of each battery in the battery pack; acquiring the voltage difference of the batteries in the battery pack according to the voltage of each battery in the battery pack; after the voltage difference of the batteries in the battery pack exceeds a preset threshold value, the battery pack balancing circuit based on the half-bridge converter is started to perform balancing control on the battery pack, the number, the cost and the size of devices of the whole balancing system are effectively reduced, the modularization capability and the reliability of the balancing system are improved, in addition, the balancing current can be ensured to be continuous and controllable in size, the balancing speed and the balancing efficiency are greatly improved, the service life of the batteries is further prolonged to the maximum extent, and the safety and the reliability of the battery pack are ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048915.XA CN112671076A (en) | 2021-01-14 | 2021-01-14 | Battery pack equalization circuit based on half-bridge converter and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048915.XA CN112671076A (en) | 2021-01-14 | 2021-01-14 | Battery pack equalization circuit based on half-bridge converter and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112671076A true CN112671076A (en) | 2021-04-16 |
Family
ID=75415092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110048915.XA Pending CN112671076A (en) | 2021-01-14 | 2021-01-14 | Battery pack equalization circuit based on half-bridge converter and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112671076A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629811A (en) * | 2021-08-11 | 2021-11-09 | 傲普(上海)新能源有限公司 | Battery equalization circuit of inductive transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012015621A1 (en) * | 2012-08-07 | 2014-02-13 | Winfried Schimmelpfennig | Method for performing capacitive energy transmission for balancing cell voltages at e.g. lithium ion battery in electric vehicle, involves capacitively coupling half bridge outputs with one another through capacitors for charge transmission |
| CN103956799A (en) * | 2014-05-19 | 2014-07-30 | 山东大学 | Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof |
-
2021
- 2021-01-14 CN CN202110048915.XA patent/CN112671076A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012015621A1 (en) * | 2012-08-07 | 2014-02-13 | Winfried Schimmelpfennig | Method for performing capacitive energy transmission for balancing cell voltages at e.g. lithium ion battery in electric vehicle, involves capacitively coupling half bridge outputs with one another through capacitors for charge transmission |
| CN103956799A (en) * | 2014-05-19 | 2014-07-30 | 山东大学 | Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629811A (en) * | 2021-08-11 | 2021-11-09 | 傲普(上海)新能源有限公司 | Battery equalization circuit of inductive transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20230238603A1 (en) | Battery energy processing device and method, and vehicle | |
| CN102420447B (en) | Charging and discharging compound type automatic equalizing circuit for serially-connected battery pack and equalizing method | |
| JP3809549B2 (en) | Power supply device, distributed power supply system, and electric vehicle equipped with the same | |
| CN112865232B (en) | Active battery pack equalization circuit and control method | |
| EP4164082A1 (en) | Energy conversion apparatus and safety control method therefor | |
| CN102185487A (en) | Mixed cascading type multilevel stored energy charging-discharging and voltage-equalizing circuit | |
| CN111391717B (en) | Energy conversion device and method and vehicle | |
| JP5580482B2 (en) | Method for starting a battery system with a DC voltage intermediate circuit | |
| CN112688391A (en) | Lithium ion battery equalization circuit based on symmetrical CLLC DC converter | |
| CN114744698A (en) | Parallel battery cluster topology integrating circulating current suppression and charge state equalization circuits | |
| CN112993418A (en) | Energy storage system | |
| CN214112341U (en) | Battery energy processing device and vehicle | |
| CN112688375B (en) | Balanced output system based on multi-winding transformer | |
| CN117774721A (en) | Charging switching device, charging control system and control method | |
| CN112671076A (en) | Battery pack equalization circuit based on half-bridge converter and control method | |
| CN117044099A (en) | Battery heating topology circuit and power utilization device | |
| Nie et al. | Fast battery equalization with isolated bidirectional DC-DC converter for PHEV applications | |
| US20240239219A1 (en) | Vehicle, and energy conversion device and discharging method therefor | |
| CN112994066B (en) | Charging method and device for multi-soft direct current converter series connection converter station and electronic equipment | |
| CN113224816A (en) | Isolation interface, gating network, protection and equalization circuit and method for series battery pack | |
| CN114204647A (en) | Parallel battery cluster state management system and parallel battery cluster | |
| CN221476812U (en) | Power battery charging system and vehicle | |
| CN222441563U (en) | Bidirectional resonant converter | |
| US20250046906A1 (en) | Battery self-heating device and method, and vehicle | |
| Ekren et al. | Single Capacitor Topology Based Active Cell Balancing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210416 |