CN113715688A - Battery string module for power battery system of electric automobile - Google Patents
Battery string module for power battery system of electric automobile Download PDFInfo
- Publication number
- CN113715688A CN113715688A CN202111135185.3A CN202111135185A CN113715688A CN 113715688 A CN113715688 A CN 113715688A CN 202111135185 A CN202111135185 A CN 202111135185A CN 113715688 A CN113715688 A CN 113715688A
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- battery
- bmu
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- module
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- 238000007600 charging Methods 0.000 claims abstract description 32
- 238000007599 discharging Methods 0.000 claims description 23
- 238000005070 sampling Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 230000036449 good health Effects 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Images
Classifications
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- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
-
- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A battery string module for a power battery system of an electric automobile comprises a BMU control module provided with a CAN bus, a parallel access end, a BMU execution unit, a serial battery cell and a parallel access end which are sequentially connected, wherein the BMU control module is respectively connected with the BMU execution unit and the serial battery cell, the serial battery cell comprises at least two battery cells which are connected in series, the invention adopts a plurality of battery cells which are connected with the BMU execution unit through the BMU control module, the parallel use of the serial battery cells with different capacities and different types CAN be realized, the configuration of the battery pack is more flexible, the battery string modules are ensured not to be influenced mutually and CAN be put into and taken out of the battery pack at any time, the parallel flexibility of the battery string modules is increased, the energy recovery of a new energy automobile is facilitated, the endurance is improved, the running of the electric automobile is safer and more reliable, the purposes of simple and convenient maintenance and flexible and rapid charging modes are achieved, greatly prolongs the service life of the whole vehicle and has good economic and social benefits.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a battery string module for a power battery system of an electric automobile, which is used for the electric automobile.
Background
With the development of new energy automobiles, as clean energy automobiles, the main energy of electric automobiles is power batteries, in order to meet the high power application requirements of electric automobiles, a power battery system composed of hundreds of power batteries is generally adopted in the prior art to supply power to the electric automobiles, and two ways are generally adopted: firstly, a hundred of high-capacity batteries are connected in series, and secondly, a plurality of hundreds of low-capacity batteries are connected in parallel and then connected in series to form a high-capacity battery pack, but the battery pack has the following defects: that is, because of the defects of the manufacturing process of power batteries, it is difficult to ensure that all batteries in a power battery system maintain high consistency, during the use process, some batteries may be in an overcharged or overdischarged state, and the batteries in an overcharged or overdischarged state for a long time are easily damaged, thereby affecting the use of the whole battery pack, so that both of the above two connection modes of the power batteries have fatal defects, namely, any single body in the series connection link has a problem, which affects the endurance mileage of the whole vehicle, even can not be used, once the battery pack has any problem, only the power battery can be pulled to a professional maintenance factory for maintenance, which wastes time and labor, and affects the working life, and the power batteries composed by the two modes in the prior art have the problem of being incapable of being charged for a long time, therefore, in the prior art, a plurality of battery string modules are adopted, the power battery pack is formed by connecting the batteries in parallel and then is applied to an electric automobile, so that the problems of safe and reliable operation, simple and convenient maintenance, charging time reduction and the like of the electric automobile are solved, however, when the power battery pack for the electric automobile is formed by connecting a plurality of batteries in series and parallel after the batteries are connected in series, the battery strings with good health condition can be charged and discharged mutually, energy can be continuously supplemented to the backward battery strings by the battery strings with good health condition, namely, once the backward battery strings appear in the battery pack, the health condition of the whole battery pack is rapidly reduced, and the continuation of the journey is difficult to maintain.
Summary of the invention
In view of the above-mentioned drawbacks and problems of the prior art, an object of the present invention is to provide a battery string module for a power battery system of an electric vehicle, which provides an effective power battery for the electric vehicle.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a battery cluster module that electric automobile power battery system used, is including setting up BMU control module and the parallel access end, BMU execution unit, series connection electric core, the parallel access end that connect in proper order of CAN bus, BMU execution unit is including the charging control module, the discharge control module and the current sampling component series connection of series connection in proper order, BMU execution unit and series connection electric core are connected respectively to BMU control module, the series connection electric core includes that at least two electric cores establish ties and form.
In the technical scheme, the charging control module is composed of a non-return diode parallel charging switch, and the discharging control module is composed of a non-return diode parallel discharging switch.
In the technical scheme, the BMU control unit is respectively connected with a current sampling element of the BMU execution unit and a battery core of a series battery core, and is provided with a CAN bus and has the functions of single battery voltage sampling, single battery temperature sampling, charging and discharging current sampling, over-voltage and under-voltage alarming and protecting, high-temperature and low-temperature alarming and protecting, current limiting protection, charging and discharging state control, balance control and protecting, SOC (system on chip) and other parameter calculation, data storage, intelligent sorting of data and data remote transmission.
In the above technical solution, the charge switch and the discharge switch include a dc contactor, a solid-state relay, or a contactless switch.
In the above technical solution, the current sampling element includes a shunt or a hall sensor.
The battery pack is formed by connecting a plurality of battery cells with the BMU execution unit through the BMU control module, so that series battery cells with different capacities and different types can be used in parallel, and the configuration of the battery pack is more flexible. The battery string modules are guaranteed not to be affected by each other, the battery pack can be put into and taken out at any time, and if a problem occurs, the battery string modules can be maintained independently or directly replaced without affecting any use. The flexibility of parallel connection of the battery string modules is increased, the energy recovery of the new energy automobile is facilitated, and the endurance mileage is improved. The speed of the attenuation of the endurance mileage is slowed down, the electric automobile runs more safely and reliably, the purposes of simple and convenient maintenance and flexible and quick charging mode are achieved, the service life of the whole automobile is greatly prolonged, and meanwhile, the electric automobile has good economic and social benefits.
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, and 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 these drawings without creative efforts.
Fig. 1 is a schematic block diagram of the battery string module composition of the invention.
Fig. 2 is a schematic structural diagram of an inventive battery string module.
Fig. 3 is a schematic structural diagram of two sets of battery string modules connected in parallel in the embodiment of the invention.
Wherein: the system comprises a BMU execution unit 1, a serial battery cell 2, a parallel connection input end 3, a current sampling element 4, a BMU control module 5, a battery cell 6, a non-return diode 7, a charging switch 8, a discharging switch 9 and a CAN bus 10.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood 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.
As shown in fig. 1 to fig. 3, a battery string module for a power battery system of an electric vehicle according to an embodiment includes a BMU control module provided with a CAN bus, and a parallel access terminal, a BMU execution unit, a series battery cell, and a parallel access terminal that are sequentially connected.
The BMU execution unit comprises a charging control module, a discharging control module and a current sampling element which are sequentially connected in series, wherein the charging control module is composed of a non-return diode parallel charging switch, and the discharging control module is composed of a non-return diode parallel discharging switch.
The BMU control unit is respectively connected with a current sampling element of the BMU execution unit and an electric core of a series electric core, the series electric core comprises at least two electric cores which are connected in series, a CAN bus arranged by the BMU control unit is a main unit for finishing control and protection actions, data are uploaded to the whole group for communication through the CAN bus, and the BMU control unit has the functions of single cell voltage sampling, single cell temperature sampling, charge and discharge current sampling, over-voltage and under-voltage alarm and protection, high and low temperature alarm and protection, current-limiting protection, charge and discharge state control, balance control and protection, parameter calculation such as SOC (system on chip), data storage, intelligent sorting of data, data remote transmission and the like.
The BMU control module controls the charging switch and the discharging switch to be switched on or switched off through the current sampling element to realize the charging and discharging of the series battery cell, and the charging and discharging process can be independently controlled.
The charging and discharging circuit formed by the charging control module and the discharging control module can be switched by adjusting the charging switch and the discharging switch, the charging control module is connected with a connection wire, namely the charging switch is connected with the charging relay and then connected with the charging anode; the discharging control module is connected with a wiring, namely the charging module and the discharging module are connected in series and then connected to the charging relay and the positive electrode of the motor; the total negative is connected with the negative pole of the motor by serially connecting the battery cores and sequentially connecting the Hall sensor and the main negative relay.
The charging switch and the discharging switch are used for controlling the charging and discharging states, can be realized by a direct current contactor, a solid-state relay or a non-contact switch and are determined according to specific working conditions and actual requirements; the current sampling element is one of a shunt or a Hall sensor, and is determined according to specific working conditions and actual requirements.
The selection of the cells in the series cells can be flexibly configured according to actual needs, for example, the cells in each series cell adopt lithium iron phosphate batteries, lithium iron titanate batteries and the like with the same specification and model, the types and capacities of the cells in each series cell must be consistent, but the capacities of the cells of different battery string modules in the same vehicle can be the same or different, and the types of the batteries can be the same or different batteries can be adopted according to different use modes.
In actual use, a plurality of groups of battery string modules are connected in parallel, the input ends of the battery string modules are connected in parallel to form the power battery pack of the electric automobile, the output electric energy is used for providing power required in the running process of the automobile, and if the battery core of one group of battery string modules goes wrong, the normal running of the whole automobile is not influenced; a group of parallel battery string modules are selected randomly to serve as multifunctional battery string modules, can be used according to spare series battery cores, can be connected in parallel to a battery pack for unified use, can also serve as a power supply with a special function (such as heating or refrigeration) for independent use, and can absorb and store input electric energy generated in the running process of an automobile at any time.
According to the illustration in fig. 3, 2 groups are selected in the embodiment to explain the working principle in detail, 104 lithium iron phosphate power batteries of 3.65V/50Ah are selected for each series-connected battery cell to be connected in series in sequence, the parameters of the whole group of batteries after parallel connection are 379.6V/100Ah, and the power of the whole vehicle is 37.96 kWh.
When the electric automobile stops, the two groups of battery string modules are in a shelving state, the self-discharge rates can be distinguished due to the differences of the battery string modules, if the electric automobile stops for a long time, a certain voltage difference exists between each group of battery string modules, and in addition, the maintained battery string modules or newly replaced battery string modules and the original battery string modules also have a certain voltage difference. If V1> V2, V1 is the terminal voltage of the battery string module 1; the V2 is the terminal voltage of the battery string module 2, because the charging loop and the discharging loop of the two groups of battery string modules are completely independent through the control of the non-return diode and the charging and discharging switch, even if V1 is greater than V2, the battery string module 1 will not charge the battery string module 2, therefore, the two groups of battery string modules will not affect each other when charging or placing, when the electric automobile runs normally (the battery discharges), the battery string module 1 preferentially releases energy to provide the power needed by the whole automobile, when the voltage drops to V1 which is V2, the two groups of battery string modules release energy simultaneously.
In the normal driving process of the electric automobile, the two groups of battery string modules simultaneously provide power, if the capacity of a certain battery cell in the battery string module 1 is insufficient, the BMU1 control unit sends a control command to the BMU1 execution unit to disconnect the discharge switch, the battery string module 1 automatically exits the system, the BMU1 control unit carries out balance processing on the laggard battery cell, after the self-repairing is successful, the closed discharge switch is automatically put into the system, the self-repairing is unsuccessful, the whole automobile power can still drive to the nearest maintenance point to maintain the battery string or replace the whole battery string even if only half of the power remains, and the battery string modules are independent from each other, so the maintenance and the replacement are safer and more convenient.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides a battery cluster module that electric automobile power battery system used which characterized in that: the system comprises a BMU control module, a parallel access end, a BMU execution unit, a serial electric core and a parallel access end, wherein the BMU control module is provided with a CAN bus, and the parallel access end, the BMU execution unit, the serial electric core and the parallel access end are sequentially connected.
2. The battery string module for the power battery system of the electric vehicle of claim 1, wherein: the charging control module is composed of a non-return diode parallel charging switch, and the discharging control module is composed of a non-return diode parallel discharging switch.
3. The battery string module for the power battery system of the electric vehicle according to claim 1 or 2, characterized in that: and the BMU control unit is respectively connected with the current sampling element of the BMU execution unit and the battery cell of the series battery cell.
4. The battery string module for the power battery system of the electric vehicle of claim 3, wherein: the charging switch and the discharging switch comprise direct current contactors, solid state relays or contactless switches.
5. The battery string module for the power battery system of the electric vehicle of claim 3, wherein: the current sampling element comprises a shunt or a hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135185.3A CN113715688A (en) | 2021-09-27 | 2021-09-27 | Battery string module for power battery system of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135185.3A CN113715688A (en) | 2021-09-27 | 2021-09-27 | Battery string module for power battery system of electric automobile |
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| Publication Number | Publication Date |
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| CN113715688A true CN113715688A (en) | 2021-11-30 |
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| CN202111135185.3A Pending CN113715688A (en) | 2021-09-27 | 2021-09-27 | Battery string module for power battery system of electric automobile |
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| CN112600264A (en) * | 2020-11-30 | 2021-04-02 | 蜂巢能源科技有限公司 | Control method and system of parallel battery packs, electronic equipment and vehicle |
| CN113315198A (en) * | 2021-05-26 | 2021-08-27 | 深圳市誉娇诚科技有限公司 | Can replace lithium battery device that lead acid battery used |
| CN216184633U (en) * | 2021-09-27 | 2022-04-05 | 哈尔滨莫翠科技有限公司 | Battery string module for power battery system of electric automobile |
-
2021
- 2021-09-27 CN CN202111135185.3A patent/CN113715688A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105075056A (en) * | 2013-03-28 | 2015-11-18 | 索尼公司 | Power storage device, power storage system, and power storage device control method |
| JP2017163749A (en) * | 2016-03-10 | 2017-09-14 | ニシム電子工業株式会社 | Secondary battery system |
| CN106451623A (en) * | 2016-10-14 | 2017-02-22 | 宁德时代新能源科技股份有限公司 | Hot plug method, hot plug control device, voltage balance method and voltage balance device |
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