CN110601319A - Series-parallel battery conversion module - Google Patents
Series-parallel battery conversion module Download PDFInfo
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- CN110601319A CN110601319A CN201911009903.5A CN201911009903A CN110601319A CN 110601319 A CN110601319 A CN 110601319A CN 201911009903 A CN201911009903 A CN 201911009903A CN 110601319 A CN110601319 A CN 110601319A
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- switch
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Classifications
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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
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
Abstract
The invention discloses a series-parallel battery conversion module, which relates to the field of new energy automobiles and comprises a control system, batteries and switch groups, wherein the batteries are provided with a plurality of groups, the number of the switch groups is one less than that of the batteries, each switch group is correspondingly connected to one battery, the control system comprises a plurality of control modules, the number of the control modules is the same as that of the switch groups, and each switch group is connected with one control module, so that the series-parallel connection mode among the batteries can be changed, the batteries are connected in series during charging, high-voltage low-current charging is carried out, the loss is reduced, the wire diameter of a charging cable is also reduced, and the risk can be reduced; when discharging, the parallel connection is carried out, low-voltage large-current discharge is carried out, and enough driving current is supplied; after the vehicle is stopped and the batteries are in dormancy, the batteries can be disconnected to form independent batteries, so that the vehicle is safer.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a series-parallel battery conversion module.
Background
With the increasing requirements of the society on environmental protection and energy conservation, hybrid electric vehicles and pure electric vehicles are more and more paid attention by governments and automobile manufacturers.
The new energy automobile battery is used as a power source, a plurality of batteries are generally connected together, and if the batteries are connected in parallel, the charging current of the battery pack is very large during charging, so that the loss is large, and great potential safety hazards exist.
When the batteries are connected in series, the batteries can be charged with a small current, but only the batteries can be discharged with a small current, and it is difficult to generate a sufficient drive current.
Chinese patent application No. 201610975032.2 discloses a series-parallel converter, which corresponds to n battery cells E1, E2, and En in a battery pack, and the converter only needs 1 n-pole double-throw switch K and n diodes D1, D2, and n, wherein n diodes D1, D2, and Dn are only used in a charging loop. The positive electrodes of the diodes are respectively connected with the negative electrodes of the single batteries and then respectively connected with normally open contacts in the n-pole double-throw switch; the cathodes of the diodes are connected In parallel and then connected with a normally closed contact An of K _ n In the n-pole double-throw switch, normally closed contacts A1-An-1 of K _ 1-K _ n-1 In the double-throw switch are connected In parallel, and then connected with the anode of a battery monomer E1 and led Out by a lead to serve as An anode port + In & Out connected with external equipment. Anodes of the battery cells E2-En are respectively connected with the poles K _ 1-K _ n-1 In the double-throw switch, and the pole K _ n In the double-throw switch is led Out by a lead and is used as a negative electrode port-In & Out connected with external equipment. The scheme is simple to manufacture and low in cost, but the serial-parallel conversion speed is low, the automatic control cannot be realized, all the batteries are controlled by one switch, and the use is not flexible enough.
Disclosure of Invention
The invention aims to provide a series-parallel battery conversion module which can change the series-parallel mode among batteries, so that the batteries are connected in series during charging, high-voltage and low-current charging is carried out, the loss is reduced, the wire diameter of a charging cable is reduced, and the risk is reduced; when discharging, the parallel connection is carried out, low-voltage large-current discharge is carried out, and enough driving current is supplied; after the vehicle is stopped and the batteries are in dormancy, the batteries can be disconnected to form independent batteries, so that the vehicle is safer.
A series-parallel battery conversion module comprises a control system, batteries and switch groups, wherein the batteries are provided with a plurality of groups, the number of the switch groups is one less than that of the batteries, each switch group is correspondingly connected to one battery, the control system comprises a plurality of control modules, the number of the control modules is the same as that of the switch groups, and each switch group is connected with one control module;
all batteries link together through the switch block, and the switch block is used for controlling the relation of connection between the battery, the switch block includes first switch, second switch and third switch, the positive terminal at the battery that corresponds is connected to first switch, the negative pole end at the battery that corresponds is connected to the third switch, the positive negative pole of second switch links to each other with the positive negative pole that corresponds the battery respectively, first switch, second switch and third switch all are connected with corresponding control module, control module is used for controlling the break-make of three switch.
Preferably, the number of the batteries is not less than 3, and the first battery is not connected with the switch group.
Preferably, the first switch, the second switch and the third switch are configured to include, but not limited to, a relay, a contactor, a push button switch, a toggle switch and a semiconductor switch.
Preferably, the first switch and the third switch may be semiconductor switches formed by MOS transistors or IGBTs, the second switch may be a semiconductor switch formed by diodes, a source of the first switch is connected to an anode of the corresponding battery, a gate of the first switch is connected to the control module, a source of the third switch is connected to a cathode of the corresponding battery, and a gate of the third switch is connected to the control module.
A conversion mechanism applied to a series-parallel battery conversion module comprises a processing mechanism for dealing with the following three states,
first, charging state
When the batteries are charged, the first switch and the third switch are turned off through the control system, the second switch is controlled to be turned on, and all the batteries are connected in series at the moment to charge the batteries at high voltage and low current;
second, discharge state
When the batteries are discharged, the second switch is turned off through the control system, the first switch and the third switch are controlled to be turned on, all the batteries are connected in parallel, and the batteries are subjected to low-voltage large-current discharge;
third, dormant state
When the batteries stop working, namely are in a state of neither discharging nor charging, the first switch, the second switch and the third switch are all turned off by the control system, and the batteries are not connected with each other at the moment.
Preferably, the first switch and the third switch are in a linkage relationship and can only be turned on or off simultaneously, the second switch, the first switch and the third switch are in a conduction interlocking relationship, the second switch cannot be turned on when the first switch and the third switch are turned on, and the first switch and the third switch cannot be turned on when the second switch is turned on.
The invention has the advantages that: the series-parallel connection mode among the batteries can be changed, so that the batteries are connected in series during charging, high-voltage and low-current charging is carried out, the loss is reduced, the wire diameter of a charging cable is reduced, and the risk is reduced; when discharging, the parallel connection is carried out, low-voltage large-current discharge is carried out, and enough driving current is supplied; after the vehicle is stopped and the batteries are in dormancy, the batteries can be disconnected to form independent batteries, so that the vehicle is safer.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of the switches in the switch bank of the present invention being semiconductor switches;
the system comprises a control system 1, a control module 10, a control module 2, a battery 3, a switch group 31, a first switch 32, a second switch 33 and a third switch.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 2, a series-parallel battery conversion module includes a control system 1, a battery 2 and switch groups 3, where the battery 2 has a plurality of groups, the number of the switch groups 3 is one less than that of the battery 2, and each switch group 3 is correspondingly connected to one battery 2, the control system 1 includes a plurality of control modules 10, the number of the control modules 10 is the same as that of the switch groups 3, and each switch group 3 is connected to one control module 10; the control system 1 includes a plurality of control modules 10, each control module 10 correspondingly controls on/off of a switch in one switch group 3, and can also be set as a total control module for controlling all switch groups 3.
All batteries 2 link together through switch group 3, and switch group 3 is used for controlling the relation of connection between battery 2, switch group 3 includes first switch 31, second switch 32 and third switch 33, first switch 31 is connected at the positive terminal of corresponding battery 2, third switch 33 is connected at the negative pole end of corresponding battery 2, the positive negative pole of second switch 32 links to each other with the positive negative pole of corresponding battery 2 respectively, first switch 31, second switch 32 and third switch 33 all are connected with corresponding control module 10, control module 10 is used for controlling the break-make of three switch. The first switch 31, the second switch 32 and the third switch 33 may be turned off at the same time but not turned on at the same time, and the first switch 31 and the third switch 33 may be turned on or off only at the same time. The batteries 2 correspond to the switch groups 3 one by one (except that the first battery 2 is not connected with one switch group 3 in a matching way), and are divided into a plurality of small units which can be regarded as independent individuals, and the control system 1 is provided with a control module 10 (except for the first battery 2) for each small unit, so that part or all of the small units can be selectively started (for example, 5 batteries are used, only the first 3 batteries are started, and two rest states are left), the batteries are more flexibly used, and electric energy can be saved. The control system 1 can automatically control the switch group 3 to make corresponding changes in 3 states of charging, discharging and flameout when the automobile is parked. Meanwhile, a driver can select the number of the starting batteries through the control system 1 in the driving process.
The number of the batteries 2 is not less than 3, and the first battery 2 is not connected with the switch group 3. The first battery 2, also used as a conventional battery, is always powered (unless the entire module is powered off, i.e. parked and shut down).
The first switch 31, the second switch 32 and the third switch 33 may be configured to include, but not limited to, a relay, a contactor, a push button switch, a toggle switch and a semiconductor switch. The first switch 31, the second switch 32, and the third switch 33 are highly selectable.
The first switch 31 and the third switch 33 can be semiconductor switches composed of MOS transistors or IGBTs, the second switch 32 can be a semiconductor switch composed of diodes, a source of the first switch 31 is connected with an anode of a corresponding battery, a gate is connected with the control module 11, a source of the third switch 33 is connected with a cathode of the corresponding battery, and a gate is connected with the control module 11. The use of semiconductor switches as the first switch 31, the second switch 32, and the third switch 33 makes the control safer, and the selection of the diode for the second switch 32 also prevents the generation of reverse current.
A conversion mechanism applied to a series-parallel battery conversion module comprises a processing mechanism for dealing with the following three states,
first, charging state
When the batteries 2 are charged, the first switch and the third switch are turned off through the control system, the second switch is controlled to be turned on, and all the batteries 2 are connected in series at the moment to charge the batteries 2 with high voltage and low current;
second, discharge state
When the batteries 2 are discharged, the control system 1 turns off the second switch 32 and controls the first switch 31 and the third switch 33 to be turned on, and at the moment, all the batteries 2 are connected in parallel, and the batteries 2 are subjected to low-voltage large-current discharge;
third, dormant state
When the batteries 2 are out of operation, i.e. in a state of neither discharge nor charge, the first switch 31, the second switch 32 and the third switch 33 are all turned off by the control system 1, while the respective batteries 2 are not connected to each other.
The control system 1 is a part of a whole vehicle system, when the vehicle is charged by plugging electricity, the control system 1 automatically controls the module to enter a charging state, and at the moment, the batteries are connected in series to perform high-voltage and low-current charging, so that the loss is reduced, the wire diameter of a charging cable is reduced, and the risk can be reduced; when the automobile is started, the control system 1 automatically controls the module to enter a discharging state, and at the moment, the batteries are connected in parallel to discharge low voltage and large current, so that enough driving current can be supplied; when the automobile is parked and flamed out, the control system 1 automatically controls the module to enter a dormant state, the control system 1 controls the first switch 31, the second switch 32 and the third switch 33 to be closed, each battery 2 becomes an independent battery at the moment, and even if one battery goes wrong, the influence on other batteries is not large.
The first switch 31 and the third switch 33 are in an interlocking relationship and can only be turned on or off at the same time, the second switch 32, the first switch 31 and the third switch 33 are in an on-interlocking relationship, when the first switch 31 and the third switch 33 are turned on, the second switch 32 cannot be turned on, and when the second switch 32 is turned on, the first switch 31 and the third switch 33 cannot be turned on. The first switch 31, the second switch 32 and the third switch 33 may be turned off at the same time but not turned on at the same time (if the three switches are turned on at the same time, a short circuit occurs regardless of whether discharging or charging occurs, and one of the advantages of using semiconductor switches is that the short circuit does not occur even if an accident that both are turned on occurs), and the first switch 31 and the third switch 33 may be turned on or off at the same time (the first switch 31 and the third switch 33 may be operated only if they are turned on or off at the same time).
The specific implementation mode and principle are as follows:
when an automobile carrying the series-parallel battery conversion module is started (including a subsequent running process), the control system 1 automatically controls the module to enter a discharging state, meanwhile, the module is communicated with an automobile power utilization unit, the battery 2 starts to discharge, the control system 1 controls the first switch 31 and the third switch 33 in the switch group 3 to be conducted and controls the second switch 32 to be turned off, all the batteries 2 are connected in parallel, and meanwhile, low-voltage large-current power supply is carried out on the automobile, so that sufficient driving current is ensured to be supplied;
in the driving process, if all the batteries 2 are not required to be started (for example, the vehicle runs at a low speed on an urban speed-limited road), a driver can manually control the number of the started batteries 2 through the control system 1, so that other batteries 2 enter a dormant state, the electric energy loss is reduced, and the service life of the dormant batteries 2 can be prolonged.
When the automobile is stopped and flamed out, the control system 1 automatically controls the module to enter a dormant state, the module is communicated and disconnected with the automobile power utilization unit, the control system 1 controls the first switch 31, the second switch 32 and the third switch 33 to be closed, and at the moment, each battery 2 becomes an independent battery and enters the dormant state.
When a driver needs to charge the automobile, the automobile is shut down firstly, then the charging power supply is plugged in, after the charging power supply is plugged in, the control system 1 automatically controls the module to enter a charging state (corresponding inductive switches can be arranged at an automobile charging port, but after the automobile is shut down, the inductive switches are triggered, the control system 1 controls the module to enter the charging state in advance), the control system 1 controls the second switch 32 to be switched on, the first switch 31 and the third switch 33 in the switch group 3 are switched off, all the batteries 2 are connected in series, and meanwhile, high-voltage low-current charging is carried out, so that the loss is reduced, the wire diameter of a charging cable is also reduced, and the risk caused by overhigh current can be reduced.
Based on the above, the invention can change the series-parallel connection mode between the batteries 2, so that the batteries 2 are connected in series during charging, and high-voltage low-current charging is carried out, thereby reducing the loss, reducing the wire diameter of the charging cable and reducing the risk; when discharging, the parallel connection is carried out, low-voltage large-current discharge is carried out, and enough driving current is supplied; after the vehicle is stopped and the batteries 2 are dormant, the batteries 2 can be disconnected to form independent batteries 2, so that the vehicle is safer.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (6)
1. A series-parallel battery conversion module is characterized by comprising a control system (1), batteries (2) and switch groups (3), wherein the batteries (2) are provided with a plurality of groups, the number of the switch groups (3) is one less than that of the batteries (2), each switch group (3) is correspondingly connected to one battery (2), the control system (1) comprises a plurality of control modules (10), the number of the control modules (10) is the same as that of the switch groups (3), and each switch group (3) is connected with one control module (10);
all batteries (2) link together through switch group (3), and switch group (3) are used for controlling the relation of connection between battery (2), switch group (3) include first switch (31), second switch (32) and third switch (33), the positive terminal at the battery (2) that correspond is connected to first switch (31), the negative pole end at the battery (2) that correspond is connected to third switch (33), the positive negative pole of second switch (32) links to each other with the positive negative pole that corresponds battery (2) respectively, first switch (31), second switch (32) and third switch (33) all are connected with corresponding control module (10), control module (10) are used for controlling the break-make of three switch.
2. The series-parallel battery conversion module of claim 1, wherein: the number of the batteries (2) is not less than 3, and the first battery (2) is not connected with the switch group (3).
3. The series-parallel battery conversion module of claim 1, wherein: the first switch (31), the second switch (32) and the third switch (33) are composed of, but not limited to, a relay, a contactor, a push-button switch, a toggle switch and a semiconductor switch.
4. The series-parallel battery conversion module according to claim 3, characterized in that: the first switch (31) and the third switch (33) can be semiconductor switches formed by MOS (metal oxide semiconductor) transistors or IGBT (insulated gate bipolar transistor), the second switch (32) can be semiconductor switches formed by diodes, the source electrode of the first switch (31) is connected with the anode of the corresponding battery, the grid electrode of the first switch is connected with the control module (11), the source electrode of the third switch (33) is connected with the cathode of the corresponding battery, and the grid electrode of the third switch is connected with the control module (11).
5. A conversion mechanism applied to the series-parallel battery conversion module of claim 1, wherein: including handling mechanisms that handle three states,
first, charging state
When the batteries (2) are charged, the first switch (31) and the third switch (33) are turned off through the control system (1), and the second switch (32) is controlled to be turned on, at the moment, all the batteries (2) are connected in series, and the batteries (2) are charged with high voltage and low current;
second, discharge state
When the batteries (2) are discharged, the second switch (32) is turned off through the control system (1), and the first switch (31) and the third switch (33) are controlled to be turned on, at the moment, all the batteries (2) are connected in parallel, and the batteries (2) are discharged at low voltage and high current;
third, dormant state
When the batteries (2) stop working, namely are in a state of neither discharging nor charging, the first switch (31), the second switch (32) and the third switch (33) are all turned off by the control system (1), and the batteries (2) are not connected with each other.
6. The conversion mechanism of the series-parallel battery conversion module according to claim 5, wherein: the first switch (31) and the third switch (33) are in an interlocking relationship and can only be turned on or off at the same time, the second switch (32) is in an on-interlocking relationship with the first switch (31) and the third switch (33), the second switch (32) cannot be turned on when the first switch (31) and the third switch (33) are turned on, and the first switch (31) and the third switch (33) cannot be turned on when the second switch (32) is turned on.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911009903.5A CN110601319A (en) | 2019-10-23 | 2019-10-23 | Series-parallel battery conversion module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911009903.5A CN110601319A (en) | 2019-10-23 | 2019-10-23 | Series-parallel battery conversion module |
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| CN110601319A true CN110601319A (en) | 2019-12-20 |
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Cited By (3)
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| CN111391714A (en) * | 2020-03-18 | 2020-07-10 | 华为技术有限公司 | Drive circuit for electric vehicle and charging and discharging method |
| CN115693963A (en) * | 2023-01-04 | 2023-02-03 | 安徽大恒新能源技术有限公司 | Intelligent assembly |
| NL2030079B1 (en) | 2021-12-08 | 2023-06-22 | Daf Trucks Nv | Electric power system for a commercial vehicle |
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Address after: 241000 building 7, science and Technology Industrial Park, high tech Industrial Development Zone, Yijiang District, Wuhu City, Anhui Province Applicant after: Wuhu Research Institute of Xidian University Address before: No. 8, Wen Jin Xi Road, Yijiang District, Wuhu, Anhui Province Applicant before: Wuhu Research Institute of Xidian University |
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