CN115241953A - Battery conversion circuit, method and vehicle - Google Patents

Battery conversion circuit, method and vehicle Download PDF

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Publication number
CN115241953A
CN115241953A CN202210969601.8A CN202210969601A CN115241953A CN 115241953 A CN115241953 A CN 115241953A CN 202210969601 A CN202210969601 A CN 202210969601A CN 115241953 A CN115241953 A CN 115241953A
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China
Prior art keywords
signal
module
battery
conversion
charging
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Pending
Application number
CN202210969601.8A
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Chinese (zh)
Inventor
韦敏刚
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Zhaoqing Xiaopeng Automobile Co Ltd
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Zhaoqing Xiaopeng Automobile Co Ltd
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Priority to CN202210969601.8A priority Critical patent/CN115241953A/en
Publication of CN115241953A publication Critical patent/CN115241953A/en
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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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • 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
    • 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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a battery conversion circuit, a battery conversion method and a vehicle. The battery conversion circuit includes: a plurality of battery modules and a conversion module; the conversion modules are respectively connected with the plurality of battery modules; the conversion module is used for boosting the power supply signal provided by the battery module to obtain a boosted signal and supplying power to the load module through the boosted signal; the conversion module is also used for carrying out voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal so as to charge the battery module through the voltage reduction signal; each battery module of the battery conversion circuit provided by the embodiment of the application can be respectively charged and powered through the conversion module, so that the battery conversion circuit is compatible with various different types of battery modules, and other battery modules can also normally work even if part of the battery modules are failed, so that the safety of a vehicle is improved.

Description

Battery conversion circuit, method and vehicle
Technical Field
The application relates to the technical field of electric automobiles, in particular to a battery conversion circuit, a battery conversion method and a vehicle.
Background
With the technical development of new energy vehicles becoming mature day by day, new energy vehicles on the market are continuously increased. The power battery is used as a power source of the new energy vehicle, and the safety of the power battery has very important influence on the safety of the new energy vehicle.
However, in the related art, the power battery has various types, specifications and performances, and is difficult to be compatible for use. In addition, the new energy vehicle may include a plurality of power batteries, and if one of the plurality of power batteries fails, normal use of the entire new energy vehicle may be affected.
Disclosure of Invention
In view of the above problems, the present application provides a battery converter circuit, a battery converter method and a vehicle to improve the above problems.
In a first aspect, an embodiment of the present application provides a battery converter circuit. The circuit includes a plurality of battery modules and a conversion module. The conversion modules are respectively connected with the plurality of battery modules; the conversion module is used for boosting the power supply signal provided by the battery module to obtain a boosted signal and supplying power to the load module through the boosted signal; the conversion module is also used for carrying out voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal so as to charge the battery module through the voltage reduction signal.
In a second aspect, an embodiment of the present application provides a battery conversion method, including: the method comprises the steps that a power supply signal provided by a battery module is subjected to boosting processing to obtain a boosting signal, and the boosting signal is used for supplying power to a load module; or, the charging signal provided by the charging module is subjected to voltage reduction processing to obtain a voltage reduction signal, so that the battery module is charged through the voltage reduction signal.
In a third aspect, an embodiment of the present application provides a vehicle including a vehicle body and the above-described battery converter circuit provided to the vehicle body.
According to the technical scheme provided by the invention, the battery conversion circuit comprises: a plurality of battery modules and a conversion module. The conversion modules are respectively connected with the plurality of battery modules; the conversion module is used for boosting the power supply signal provided by the battery module to obtain a boosted signal and supplying power to the load module through the boosted signal; the conversion module is also used for carrying out voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal so as to charge the battery module through the voltage reduction signal. According to the battery conversion circuit, a power supply signal provided by a battery module is subjected to boosting processing by a conversion module to obtain a boosting signal, the boosting signal is used for supplying power to a load module, a charging signal provided by a charging module is subjected to voltage reduction processing by the conversion module to obtain a voltage reduction signal, and the battery module is charged by the voltage reduction signal.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a battery converter circuit according to an embodiment of the present application.
Fig. 2 shows a schematic structural diagram of another battery converter circuit provided in the embodiment of the present application.
Fig. 3 shows a schematic structural diagram of a transformation submodule provided in an embodiment of the present application.
Fig. 4 shows a schematic structural diagram of an inductance control unit provided in an embodiment of the present application.
Fig. 5 shows a schematic structural diagram of another inductance control unit provided in an embodiment of the present application.
Fig. 6 shows a schematic structural diagram of a transform unit provided in an embodiment of the present application.
Fig. 7 shows a schematic structural diagram of another battery converter circuit provided in the embodiment of the present application.
Fig. 8 shows a schematic flow chart of a battery converter circuit according to an embodiment of the present application.
Fig. 9 is a schematic flow chart of another battery converter circuit provided in the embodiment of the present application.
Fig. 10 shows a schematic structural diagram of a vehicle according to an embodiment of the present application.
Fig. 11 shows a schematic structural diagram of another vehicle provided in the embodiment of the present application.
Description of the drawings: 100. a battery conversion circuit; 110. a battery module 110a, a positive electrode of the battery module, 110b, a negative electrode of the battery module; 110A, a first battery module, 110B, a second battery module; 120. a transformation module; 121. a transformation submodule; 1211. an inductance control unit 1211a, a first end 1211b of the inductance control unit, and a second end of the inductance control unit; 12111. an inductor subunit, 12111a, a first end of the inductor subunit, 12111b, a second end of the inductor subunit; 12111A, a first inductor subunit, 12111B, a second inductor subunit; 12112. a switch subunit, 12112a, a first terminal of the switch subunit, 12112b, a second terminal of the switch subunit; 12112A, a first switch subunit, 12112B, a second switch subunit; 1212. a transformation unit 1212a, a first end of the transformation unit 1212b, a second end of the transformation unit 1212c, a third end of the transformation unit; 12121. a first switch tube 12121a, a first end of the first switch tube 12121b, a second end of the first switch tube 12121c, a third end of the first switch tube; 12122. a second switch tube 12122a, a first end of the second switch tube 12122b, a second end of the second switch tube 12122c, a third end of the second switch tube; 300. a vehicle; 310. a vehicle body; 320. a load module; 330. a charging module; 340. a drive module; v1, power supply signal; v2, boosting signals;
v3, a charging signal; v4, a voltage reduction signal; v5, a first switch control signal; v6, a second switch control signal; v7, a third switch control signal; v8, fourth switch control signal.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
With the technical development of new energy electric vehicles becoming mature day by day, new energy electric vehicles on the market are increasing continuously, and a power battery is used as a power source of the new energy electric vehicles and is widely used in energy systems of pure electric series and hybrid power train types.
However, in the conventional technology, the power batteries of the battery pack of the new energy electric vehicle are connected in series, and all the power batteries in the battery pack of the electric vehicle are all in the same loop at the moment, so that the charging and running safety of the whole new energy electric vehicle can be influenced by the single power battery fault, and the new energy electric vehicle is low in reliability and inconvenient to use in daily life.
In order to improve the above problem, the inventor proposes a battery converter circuit and a method proposed by the present application, wherein the battery converter circuit includes: a plurality of battery modules and a conversion module; the conversion modules are respectively connected with the plurality of battery modules; the conversion module is used for boosting the power supply signal provided by the battery module to obtain a boosted signal and supplying power to the load module through the boosted signal; the conversion module is also used for carrying out voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal so as to charge the battery module through the voltage reduction signal. The battery conversion circuit obtains a boosting signal after boosting the power signal provided by the battery module through the conversion module, supplies power to the load module through the boosting signal, obtains a voltage reduction signal after performing voltage reduction processing on the charging signal provided by the charging module through the conversion module, and charges the battery module through the voltage reduction signal, so that a fault battery is automatically isolated when a single battery in a battery pack fails, and the reliability of the new energy electric automobile is improved.
The battery converter circuit provided in the present application will be described in detail by specific embodiments.
Referring to fig. 1, a battery converter circuit 100 according to an embodiment of the present disclosure includes a plurality of battery modules 110 and a converter module 120.
In the embodiment of the present application, the conversion modules 120 are respectively connected to the plurality of battery modules 110; the conversion module 120 is configured to boost the power signal provided by the battery module 110 to obtain a boosted signal, and supply power to the load module through the boosted signal; the converting module 120 is further configured to perform voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal, so as to supply power to the battery module 110 through the voltage reduction signal.
It can be understood that, through the voltage boosting and voltage reducing functions of the conversion module 120, the battery modules 110 with different specifications can be compatible, and the conversion module 120 performs voltage boosting output or voltage reduction charging, thereby improving the applicability.
In an embodiment of the present application, the conversion module 120 is further configured to obtain a first target power signal provided by a first target battery module, and perform a voltage boosting process on the first target power signal to obtain a first signal; the conversion module is also used for carrying out voltage reduction processing on the first signal to obtain a second signal and transmitting the second signal to a second target battery module so as to charge the second target battery module through the second signal; the second target battery module is another battery module different from the first target battery module among the plurality of battery modules.
It can be understood that, through the voltage boosting effect and the voltage reducing effect of the conversion module 120 on different battery modules, the circulation of current between different battery modules can be realized, so that the battery modules are self-heated by utilizing the internal resistance of the battery, and the cruising ability and the power performance of the vehicle in a cold environment are improved.
In some embodiments, as shown in fig. 2, the transformation module 120 includes a plurality of transformation submodules 121, the plurality of transformation submodules 121 correspond to the plurality of battery modules 110 one to one, and each transformation submodule 121 is connected to a corresponding battery module 110; the conversion submodule 121 is configured to boost a power supply signal provided by the corresponding battery module 110 to obtain a boosted signal; the converting submodule 121 is further configured to perform voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal, and charge the corresponding battery module 110 through the voltage reduction signal.
In some embodiments, as shown in fig. 3, the transformation submodule 121 includes: an inductance control unit 1211 and a transformation unit 1212.
In the embodiment of the present application, a first end 1211a of the inductance control unit 1211 is connected to the positive electrode 110a of the corresponding battery module 110, and a second end 1211b of the inductance control unit 1211 is connected to the second end 1212b of the transforming unit 1212; the inductance control unit 1211 is configured to boost a power supply signal provided by the corresponding battery module 110 to obtain a boosted signal V2, and the conversion unit 1212 outputs the boosted signal V2 through a second end 1212b of the conversion unit 1212; the inductance control unit 1211 is further configured to perform a voltage reduction process on the charging signal V3 obtained from the second end 1212b of the transforming unit 1212 to obtain a voltage reduction signal, and transmit the voltage reduction signal to the positive electrode 110a of the corresponding battery module 110.
The inductance control unit 1211 includes an inductor subunit and a switch subunit, and the inductor subunit is connected in series to the switch subunit.
It can be understood that the inductor subunit participates in the operation of the battery converter circuit by relying on the current holding characteristic of the inductor; when the battery module needs to be boosted and output, the inductor subunit and the battery module cooperatively work through the current holding characteristic of the inductor subunit to output the current with the boosted voltage; when the battery module needs to be charged in a voltage reduction mode, the inductor subunit is fully charged and then supplies the current after voltage reduction to the battery module through the current maintaining characteristic of the inductor subunit, and therefore the battery module is continuously charged.
In some embodiments, as shown in fig. 4, the inductive subunit 12111 is connected between the switch subunit 12112 and the positive electrode 110a of the battery module.
Specifically, a first end 12111a of the inductance subunit 12111 is connected to the positive electrode 110a of the battery module, and a second end 12111b of the inductance subunit 12111 is connected to the second end 1212b of the transforming unit via the switch subunit 12112; the first end 12112a of the switch subunit 12112 is connected to the second end 12111b of the inductor subunit 12111, and the second end 12112b of the switch subunit 12112 is connected to the second end 1212b of the transforming unit.
In some embodiments, as shown in fig. 5, the inductor subunit 12111 is connected between the switch subunit 12112 and the second end 1212b of the transform unit.
Specifically, a first end 12111a of the inductance subunit 12111 is connected to the positive electrode 110a of the battery module via the switch subunit 12112, and a second end 12111b of the inductance subunit 12111 is connected to the second end 1212b of the transforming unit; the first end 12112a of the switch subunit 12112 is connected to the first end 110a of the battery module, and the second end 12112b of the switch subunit 12112 is connected to the first end 12111a of the inductor subunit 12111.
In the embodiment of the present application, the first end 1212a of the transforming unit 1212 is configured to obtain the charging signal V3 provided by the charging module, the second end 1212b of the transforming unit 1212 is connected to the second end 1211b of the inductance control unit 1211, and the third end 1212c of the transforming unit 1212 is connected to the negative electrode 110b of the corresponding battery module 110; the transforming unit 1212 is configured to supply the boost signal V2 obtained from the second end 1211b of the inductance control unit 1211 to the load module.
In some embodiments, as shown in fig. 6, the transforming unit 1212 includes a first switching tube 12121 and a second switching tube 12122.
In the embodiment of the present application, a first end 12121a of the first switching tube 12121 is configured to obtain the charging signal V3 provided by the charging module, the first end of the first switching tube 12121 is further configured to output a corresponding boost signal V2, a second end 12121b of the first switching tube 12121 is configured to receive the first switch control signal V5, and a third end 12121c of the first switching tube 12121 is connected to the second end 1211b of the inductance control unit 1211; the first switch tube 1211 is used for connecting or disconnecting a path between the first end 1211a and the third end 1211c of the first switch tube 1211 according to the first switch control signal V5.
Alternatively, the first switch 12121 may adopt an NMOS transistor, such as an enhancement NMOS transistor.
In the embodiment of the present application, a first end 12122a of the second switching tube 12122 is connected to a second end 1211b of the inductance control unit 1211, the second end of the second switching tube 12122 is configured to receive the second switching control signal V6, and a third end 12122c of the second switching tube 12122 is connected to the negative electrode 110b of the corresponding battery module 110; the second switching tube 12122 is used to connect or disconnect a path between the first end 12122a and the third end 12122c of the second switching tube 12122 according to the second switching control signal V6.
Alternatively, the second switch 12122 may adopt an NMOS transistor, such as an enhancement NMOS transistor.
As shown in fig. 7, an embodiment of the present application provides a schematic structural diagram of another battery converter circuit. In an embodiment of the present application, the battery converting circuit 100 may include two battery modules, which are a first battery module 110A and a second battery module 110B, respectively, and the first battery module 110A and the second battery module 110B may be power batteries with the same specification or power batteries with different specifications, which is not limited in this disclosure.
It is understood that the battery converter circuit 100 may further include a greater number of battery modules, which is not limited by the present invention.
In an embodiment of the present application, the battery converter circuit 100 further includes a conversion module; the transformation module may include two transformation submodules, which are a first transformation submodule and a second transformation submodule, respectively; each conversion submodule and the corresponding battery module are combined into a loop, and the loop and a loop formed by other conversion submodules and the corresponding battery modules are connected in parallel in the battery conversion circuit 100, so that the normal work of other loops cannot be influenced by the failure of one loop, and the reliability of the battery conversion circuit is improved.
In some embodiments, the specific number of transform submodules corresponds to the number of battery modules one to one.
In some embodiments, the first conversion submodule is correspondingly connected to the first battery module 110A, the first conversion submodule includes a first inductance control unit, the first inductance control unit includes a first inductance subunit 12111A and a first switch subunit 12112A, and the first inductance subunit 12111A and the first switch subunit 12112A are connected in series.
Optionally, the first inductor subunit 12111A is an inductor; the first switch subunit 12112A is a single pole, single throw switch.
In some embodiments, the first transformation submodule further includes a first transformation unit, and the first transformation unit includes a first switching tube 12121A and a second switching tube 12122A; the on/off of the first switching tube 12121A is controlled by a first switch control signal V5, and the on/off of the second switching tube 12122A is controlled by a second switch control signal V6.
Optionally, the first switch tube 12121A is an enhancement type NMOS tube including a body diode, and the second switch tube 12122A is an enhancement type NMOS tube including a body diode; the first switch control signal and the second switch control signal can adopt PWM signals with adjustable duty ratios.
In an embodiment of the present application, the conversion module further includes a second conversion submodule, which is correspondingly connected to the second battery module 110B.
In some embodiments, the second transformation submodule comprises a second inductance control unit comprising a second inductance subunit 12111B and a second switch subunit 12112B, the second inductance subunit 12111B being connected in series with the second switch subunit 12112B.
Optionally, the second inductor subunit 12111B is an inductor; the second switch subunit 12112B is a single pole single throw switch.
In some embodiments, the second transformation submodule further includes a second transformation unit, and the second transformation unit includes a first switching tube 12121B and a second switching tube 12122B; the on/off of the first switching tube 12121B is controlled by a third switching control signal V7, and the on/off of the second switching tube 12122B is controlled by a fourth switching control signal V8.
Optionally, the first switch tube 12121B is an enhancement type NMOS tube including a body diode, and the fourth switch tube 12122B is an enhancement type NMOS tube including a body diode; the third switch control signal and the fourth switch control signal may adopt PWM signals with adjustable duty ratios.
The operation of the battery converter circuit 100 according to the embodiment of the present application will be described in detail below.
When the first battery sub-module 110A supplies power to the load module, the first switch sub-unit 12112A is turned on, at this time, the first battery sub-module 110A powers on the first inductor sub-unit 12111A, after the first inductor sub-unit 12111A is turned on, the first switch tube 12121A is turned on due to the leakage of the body diode of the first switch tube 12121A, and at this time, the second switch control signal V6 is controlled to be in a high level state, the second switch tube 12122A is turned on, the first inductor sub-unit 12111A is in a charging state, and the current of the first inductor sub-unit 12111A increases with the increase of the power-on time; at this time, the second switch control signal V6 is controlled to be in a low level state, the second switch tube 12122A is turned off, the first inductor subunit 12111A can only discharge through the first switch tube 12121A, the voltage of the first battery submodule 110A is superimposed at this time, the voltage is increased from the power signal to the boost signal, and the absolute value of the boost signal is adjusted by the duty ratio of the second switch control signal V6, so that the first battery module 110A supplies electric energy to the load module.
When the second battery sub-module 110B is required to provide power to the load module, the second switch sub-unit 12112B is turned on, at this time, the second battery sub-module 110B powers on the second inductor sub-unit 12111B, after the second inductor sub-unit 12111B is turned on, the third switch tube 12121B is turned on due to the leakage of the body diode of the first switch tube 12121B, and at this time, the fourth switch control signal V8 is controlled to be in a high level state, the fourth switch tube 12122B is turned on, the second inductor sub-unit 12111B is in a charging state, and the current of the second inductor sub-unit 12111B increases with the increase of the power-on time; at this time, the fourth switch control signal V8 is controlled to be in a low level state, the second switching tube 12122B is turned off, the second inductor subunit 12111B can only discharge through the first switching tube 12121B, the voltage of the second battery submodule 110B is superimposed at this time, the voltage is increased from the power signal to the boost signal, and the absolute value of the boost signal is adjusted by the duty ratio of the fourth switch control signal V8, so that the second battery module 110B supplies electric energy to the load module.
It can be understood that the circuit formed by the first battery module 110A and the first conversion sub-module and the circuit formed by the second battery module 110B and the second conversion sub-module are connected in parallel in the circuit, so when one of the circuits fails, the normal power output of the other circuit is not affected, and the reliability of the vehicle is improved.
When the charging module is required to reduce voltage to charge the first battery module 110A, the first switch subunit 12112A is turned on, the first switch control signal V5 is controlled to be in a high level state, the second switch control signal V6 is controlled to be in a low level state, the first switch tube 12121A is turned on, the second switch tube 12122A is turned off, and at this time, the first inductor subunit 12111A is in a charging state; the first switch control signal V5 is controlled to be in a low level state, the first switch tube 12121A is turned off, at this time, the first inductor subunit 12111A discharges to charge the first battery module 110A, the voltage is reduced by the charging signal to be a voltage reduction signal, and the absolute value of the voltage reduction signal is adjusted by the duty ratio of the first switch control signal V5, so that the voltage reduction charging of the first charging module 110A by the charging module is realized.
When the charging module is required to step down to charge the second battery module 110B, the second switch subunit 12112B is turned on, the third switch control signal V7 is controlled to be in a high level state, the fourth switch control signal V8 is controlled to be in a low level state, the third switch transistor 12121B is turned on, the fourth switch transistor 12122B is turned off, and at this time, the second inductor subunit 12111B is in a charging state; the third switch control signal V7 is controlled to be in a low level state, the third switch tube 12121B is turned off, at this time, the second inductor subunit 12111B discharges to charge the second battery module 110B, the voltage is reduced by the charging signal to be a voltage reduction signal, and the absolute value of the voltage reduction signal is adjusted by the duty ratio of the third switch control signal V7, so that the charging module realizes the voltage reduction charging of the second battery module 110B.
It can be understood that the loop formed by the first battery module 110A, the first conversion submodule and the charging module and the loop formed by the second battery submodule 110B, the second conversion submodule and the charging module are connected in parallel in the circuit, so when one of the loops fails, the normal charging operation of the other loop on the other battery module is not influenced, and the reliability of the vehicle is improved.
When the battery needs to be heated, firstly, the electric energy of the first battery module 110A is boosted and output, the first switch subunit 12112A is turned on, at this time, the first battery submodule 110A is powered on the first inductor subunit 12111A, after the first inductor subunit 12111A is turned on, the first switch subunit 12121A is turned on due to the leakage of the body diode of the first switch subunit 12121A, at this time, the second switch control signal V6 is controlled to be in a high level state, the second switch subunit 12122A is turned on, the first inductor subunit 12111A is in a charging state, and the current of the first inductor subunit 12111A increases with the increase of the power-on time; at this time, the second switch control signal V6 is controlled to be in a low level state, the second switch tube 12122A is turned off, the first inductor subunit 12111A can only discharge through the first switch tube 12121A, the voltage of the first battery submodule 110A is superimposed at this time, the voltage is increased from the power supply signal to the boost signal, and the absolute value of the boost signal is regulated by the duty ratio of the second switch control signal V6, so that the boost output of the first battery submodule 110A to the electric energy is realized; at this time, the second battery sub-module 110B is charged with reduced voltage, the second switch sub-unit 12112B is turned on, the third switch control signal V7 is in a high level state, the fourth switch control signal V8 is in a low level state, the third switch tube 12121B is turned on, the fourth switch tube 12122B is turned off, and the second inductor sub-unit 12111B is in a charging state; the third switch control signal V7 is in a low level state, the third switch tube 12121B is turned off, at this time, the second inductor subunit 12111B discharges to charge the second battery module 110B, the voltage is decreased from the charge signal to a step-down signal, and the absolute value of the step-down signal is adjusted by the duty ratio of the third switch control signal V7, so that the step-down charging of the second battery module 110B by the charge module is realized; at this time, the first battery module 110A and the first conversion submodule, and the second battery module 110B and the second conversion submodule form a loop, and current flows between the first battery module 110A and the second battery module 110B, that is, from the first battery module 110A to the second battery module 110B, because internal resistance exists in the first battery module 110A and the second battery module 110B, self-heating of the battery is realized.
Similarly, the second battery submodule 110B may perform a boost output, and the electric energy of the first battery module 110A may perform a buck charge, at which time, a current flows from the second battery submodule 110B to the first battery module 110A, so as to achieve self-heating of the battery.
As shown in fig. 8, an embodiment of the present application further provides a battery conversion method 200, which includes the following steps:
step 210, performing voltage boosting processing on the power signal provided by the battery module to obtain a boosted signal, so as to supply power to the load module through the boosted signal.
And step 220, performing voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal, so as to charge the battery module through the voltage reduction signal.
In an embodiment of the present application, as shown in fig. 9, the method steps of the battery conversion method 200 further include:
step 230, a first target power signal provided by the first target battery module is obtained.
And step 240, performing voltage boosting processing on the first target power supply signal to obtain a first processed signal.
And step 250, performing voltage reduction processing on the first processing signal to obtain a second processing signal.
And step 260, transmitting the second processing signal to a second target battery module so as to charge the second target battery module through the second processing signal.
The first target battery module is one of a plurality of battery modules; the second target battery module is another battery module different from the first target battery module among the plurality of battery modules.
The battery conversion method according to the embodiment of the present application may be applied to the battery conversion circuit according to the foregoing embodiment, and specific reference may be made to the description of the foregoing embodiment, which is not described herein again.
As shown in fig. 10, the embodiment of the present application further provides a vehicle 300, wherein the vehicle 300 includes a vehicle body 310 and the battery converter circuit 100, and the battery converter circuit 100 is disposed inside the vehicle body 310.
In the embodiment of the present application, as shown in fig. 11, the vehicle 300 further includes: a load module 320, a charging module 330, and a driving module 340.
Alternatively, the load module 320 may be a motor.
The charging module 330 is configured to receive a charging signal and send the charging signal to the battery module to charge the battery, or send the charging signal to the load module 320.
The driving module 340 is connected between the load module 320 and the charging module 330; the driving module 340 is configured to receive the charging signal and send the charging signal to the load module 320.
Alternatively, the vehicle 330 may be a new energy vehicle, such as a pure electric vehicle, an extended range electric vehicle, a hybrid vehicle, and the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A battery converter circuit, characterized in that the battery converter circuit (100) comprises:
a plurality of battery modules (110);
conversion modules (120), the conversion modules (120) being connected to the plurality of battery modules (110), respectively; the conversion module (120) is used for boosting the power supply signal provided by the battery module (110) to obtain a boosted signal and supplying power to the load module through the boosted signal; the conversion module (120) is further configured to perform voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal, so that the battery module (110) is charged through the voltage reduction signal.
2. The battery conversion circuit according to claim 1, wherein the conversion module (120) comprises a plurality of conversion submodules (121), the plurality of conversion submodules (121) correspond to the plurality of battery modules (110) one by one, the conversion submodules (121) are connected to the corresponding battery modules (110), and the conversion submodules (121) are configured to boost a power supply signal provided by the corresponding battery modules (110) to obtain a boosted signal; the conversion module (120) is further configured to perform voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal, so as to charge the corresponding battery module (110) through the voltage reduction signal.
3. The battery converter circuit according to claim 2, wherein said conversion submodule (121) comprises:
an inductance control unit (1211), a first end (1211 a) of the inductance control unit being connected to a positive electrode (110 a) of the corresponding battery module;
a conversion unit (1212), a first end (1212 a) of which is configured to obtain the charging signal provided by the charging module, and a second end (1212 b) of which is connected to a second end (1211 b) of the inductance control unit; the third end (1212 c) of the conversion unit is connected to the negative electrode (110 b) of the corresponding battery module;
the inductance control unit (1211) is used for boosting a power supply signal provided by the corresponding battery module (110) to obtain a boosted signal; the conversion unit (1212) is configured to supply the boost signal obtained from the second end (1211 b) of the inductance control unit to the load module through the first end (1212 a) of the conversion unit;
the inductance control unit (1211) is further configured to perform a voltage reduction process on the charging signal obtained from the second terminal (1212 b) of the conversion unit to obtain a voltage reduction signal.
4. A battery converter circuit according to claim 3, characterized in that said inductance control unit (1211) comprises an inductance subunit (12111) and a switch subunit (12112), said inductance subunit (12111) being connected in series to said switch subunit (12112).
5. The battery converter circuit according to claim 4, wherein said conversion unit (1212) comprises:
a first switch tube (12121), a first end (12121 a) of the first switch tube is configured to obtain the charging signal provided by the charging module, and the first end (12121 a) of the first switch tube is further configured to output the corresponding boost signal; the second end (12121 b) of the first switch tube is used for receiving a first switch control signal; the third end (12121 c) of the first switch tube is connected to the second end (1211 b) of the inductance control unit; the first switch tube (12121) is used for connecting or disconnecting a path between a first end (12121 a) and a third end (12121 c) of the first switch tube according to the first switch control signal;
a second switch tube (12122), a first end (12122 a) of the second switch tube being connected to a second end (1211 b) of the inductance control unit; a second end (12122 b) of the second switch tube is for receiving a second switch control signal; the third end (12122 c) of the second switch tube is connected to the negative electrode (110 b) of the corresponding battery module; the second switch tube (12122) is used for connecting or disconnecting a path between a first end (12122 a) and a third end (12122 c) of the second switch tube according to the second switch control signal.
6. The battery converter circuit according to any of claims 1 to 5, wherein the converter module (120) is further configured to obtain a first target power signal provided by a first target battery module, and to perform a voltage boosting process on the first target power signal to obtain a first signal; the conversion module 120 is further configured to perform voltage reduction processing on the first signal to obtain a second signal, and transmit the second signal to a second target battery module, so as to charge the second target battery module through the second signal; wherein the first target battery module is one of the plurality of battery modules (110); the second target battery module is another battery module (110) different from the first target battery module among the plurality of battery modules (110).
7. A battery conversion method applied to the battery conversion circuit according to any one of claims 1 to 6, comprising:
the method comprises the steps that a power supply signal provided by a battery module is subjected to boosting processing to obtain a boosting signal, and power is supplied to a load module through the boosting signal;
and carrying out voltage reduction processing on the charging signal provided by the charging module to obtain a voltage reduction signal so as to charge the battery module through the voltage reduction signal.
8. The battery changing method according to claim 7, further comprising:
acquiring a first target power supply signal provided by a first target battery module;
performing voltage boosting processing on the first target power supply signal to obtain a first signal;
carrying out voltage reduction processing on the first signal to obtain a second signal;
transmitting the second signal to the second target battery module to charge the second target battery module by the second signal;
wherein the first target battery module is one of the plurality of battery modules; the second target battery module is another battery module different from the first target battery module among the plurality of battery modules.
9. A vehicle, characterized in that the vehicle (300) comprises a vehicle body (310) and a battery converter circuit (100) according to any one of claims 1 to 6, the battery converter circuit (100) being provided to the vehicle body (310).
10. The vehicle of claim 9, characterized in that the vehicle (300) further comprises:
a load module (320);
the charging module (330) is used for receiving a charging signal and sending the charging signal to the battery module (110) to charge the battery (110) or sending the charging signal to the load module (320);
a driving module (340), the driving module (340) being connected between the charging module (330) and the charging module (320); the driving module (340) is used for receiving a charging signal and sending the charging signal to the load module (320).
CN202210969601.8A 2022-08-12 2022-08-12 Battery conversion circuit, method and vehicle Pending CN115241953A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110025125A1 (en) * 2009-07-31 2011-02-03 Ladislaus Joseph Brabec Bi-directional battery voltage converter
US20140203761A1 (en) * 2013-01-22 2014-07-24 Qualcomm Incorporated Buck boost charging for batteries
CN109591627A (en) * 2018-12-05 2019-04-09 珠海格力电器股份有限公司 A kind of electric car energy-storage system
CN111029667A (en) * 2019-11-08 2020-04-17 华为技术有限公司 Battery heating system, electric automobile and on-vehicle system
CN112477665A (en) * 2019-09-11 2021-03-12 比亚迪股份有限公司 Electric vehicle, control method of charging system of electric vehicle, storage medium and control device
CN216354438U (en) * 2021-10-29 2022-04-19 宁德时代新能源科技股份有限公司 Self-heating control circuit and system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110025125A1 (en) * 2009-07-31 2011-02-03 Ladislaus Joseph Brabec Bi-directional battery voltage converter
US20140203761A1 (en) * 2013-01-22 2014-07-24 Qualcomm Incorporated Buck boost charging for batteries
CN109591627A (en) * 2018-12-05 2019-04-09 珠海格力电器股份有限公司 A kind of electric car energy-storage system
CN112477665A (en) * 2019-09-11 2021-03-12 比亚迪股份有限公司 Electric vehicle, control method of charging system of electric vehicle, storage medium and control device
CN111029667A (en) * 2019-11-08 2020-04-17 华为技术有限公司 Battery heating system, electric automobile and on-vehicle system
CN216354438U (en) * 2021-10-29 2022-04-19 宁德时代新能源科技股份有限公司 Self-heating control circuit and system

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