CN110861536A - Electric vehicle and power battery system thereof - Google Patents
Electric vehicle and power battery system thereof Download PDFInfo
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- CN110861536A CN110861536A CN201810891731.8A CN201810891731A CN110861536A CN 110861536 A CN110861536 A CN 110861536A CN 201810891731 A CN201810891731 A CN 201810891731A CN 110861536 A CN110861536 A CN 110861536A
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- 238000004146 energy storage Methods 0.000 claims abstract description 35
- 238000012806 monitoring device Methods 0.000 claims abstract description 33
- 238000004804 winding Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 101100478989 Caenorhabditis elegans swp-1 gene Proteins 0.000 description 6
- 239000000178 monomer Substances 0.000 description 4
- 102100039216 Dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit 2 Human genes 0.000 description 3
- 101000670093 Homo sapiens Dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit 2 Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an electric vehicle and a power battery system thereof, wherein the power battery system comprises a battery pack, and battery cells in the battery pack are connected in series; the battery pack comprises an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with an energy storage device; each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell. According to the technical scheme provided by the invention, the energy storage devices are connected with the battery modules, and the battery modules are actively and uniformly controlled through the energy storage devices, so that the problem that the balance control cannot be simultaneously performed between the battery modules and between the battery cores in the power battery in the prior art is solved.
Description
Technical Field
The invention belongs to the technical field of power battery balance control, and particularly relates to an electric vehicle and a power battery system thereof.
Background
With the increasing environmental pollution and energy crisis, electric vehicles have attracted much attention due to their advantages of low environmental pollution, high energy utilization, and the like. The battery is used as an energy source of the electric vehicle, plays an important role in the running process of the electric vehicle, and meanwhile, the battery problem is one of the bottlenecks of the electric vehicle, so that great breakthrough is difficult to achieve in a short period. Under the prior art conditions, how to play the role of the battery to the greatest extent possible becomes the key point of the research on the battery technology.
In the production process, the battery monomer (namely the battery core) has differences in production process, materials and the like; in the placing process, the self-discharge rates of the battery monomers are different; in the use process, the battery is influenced by the temperature of the working environment, a circuit and the like, so that the battery has difference. Under the influence of the above factors, the battery cells will be in an unbalanced state after a long time of charge and discharge. The unbalanced state of the battery will cause the overall capacity of the battery pack to decrease and the battery cells to be overcharged or overdischarged, which seriously affects the service life of the battery.
The battery balancing technology is to eliminate the difference between batteries by adopting a mobile topological structure and a control method so as to enable the batteries to be in a balanced state. The existing equalization technology mainly comprises an active equalization technology and a passive equalization technology, wherein the passive equalization technology is characterized in that a resistor with controllable power is connected in series with each battery cell, and when a battery monomer with high energy needs to be equalized, the resistor is controlled to work, and redundant energy is consumed; therefore, the passive equalization is a lossy equalization, partial energy of the battery can be consumed in the equalization process, and the endurance mileage of the power battery is reduced; and when the resistance consumes energy, a large amount of heat is generated, so in order to ensure that the battery is not overheated, the current during equalization cannot be too large.
The principle of the active equalization technology is to convert energy in a high-energy battery cell into a low-energy battery cell, and the energy loss in the conversion process is very low or even no loss, for example, a control technology of active equalization is adopted in a structure and a method of an equalization circuit between a battery cell and a battery pack disclosed in chinese patent application publication No. CN 107294174A.
But the technical scheme that above-mentioned patent application file provided can only carry out the mutual equilibrium of monomer and module, can't accomplish the equilibrium control between module and the equilibrium control between electric core and the electric core simultaneously to when carrying out equilibrium control to electric core, can only carry out equilibrium control to one of them electric core, work efficiency is lower.
Disclosure of Invention
The invention provides a power battery system, which is used for solving the problem that active balance control cannot be simultaneously carried out between battery modules and between a battery core and a battery core in a power battery in the prior art; correspondingly, the invention also provides an electric vehicle adopting the power battery system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power battery system comprises a battery pack, wherein battery cells in the battery pack are connected in series;
the battery pack comprises an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with the energy storage device;
each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell.
According to the technical scheme provided by the invention, the energy storage device is connected with each battery module, and the battery modules are actively and uniformly controlled through the energy storage device, so that the problem that the balance control among the battery modules in the power battery cannot be carried out in the prior art is solved. And every battery module includes a plurality of electric core voltage monitoring devices, and every electric core voltage monitoring devices includes a plurality of balanced unit, and every balanced unit can both carry out balanced control to its corresponding electric core, consequently can carry out balanced control to a plurality of electric cores in same battery module at the same moment to solve when carrying out balanced control to battery electric core, because can only carry out the problem that the work efficiency that causes to one of them electric core at every turn and hang down.
As a further improvement of the cell level transformers, the secondary side of each cell level transformer is connected to the corresponding cell through the corresponding split winding.
As a further improvement on the primary side circuit and the secondary side circuit of each cell level transformer, a corresponding first controllable switch is arranged on the circuit of the secondary side of each cell level transformer connected with the corresponding cell, and a second controllable switch is arranged on the circuit of the primary side of each cell level transformer connected with the corresponding cell level transformer after all the cells of each balancing unit are connected in series.
As a further improvement on the primary side line and the secondary side line of the module-level transformer, a corresponding third controllable switch is arranged on the line of the primary side of each module-level transformer connected with the energy storage device, and a corresponding fourth controllable switch is arranged on the line of the secondary side of each module-level transformer connected with a corresponding battery module.
As a further improvement to the energy storage device, the energy storage device is a battery.
An electric vehicle comprises a power battery, wherein the power battery comprises a battery pack, and battery cores in the battery pack are connected in series;
the battery pack comprises an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with the energy storage device;
each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell.
As a further improvement of the cell level transformers, the secondary side of each cell level transformer is connected to the corresponding cell through the corresponding split winding.
As a further improvement on the primary side circuit and the secondary side circuit of each cell level transformer, a corresponding first controllable switch is arranged on the circuit of the secondary side of each cell level transformer connected with the corresponding cell, and a second controllable switch is arranged on the circuit of the primary side of each cell level transformer connected with the corresponding cell level transformer after all the cells of each balancing unit are connected in series.
As a further improvement on the primary side line and the secondary side line of the module-level transformer, a corresponding third controllable switch is arranged on the line of the primary side of each module-level transformer connected with the energy storage device, and a corresponding fourth controllable switch is arranged on the line of the secondary side of each module-level transformer connected with a corresponding battery module.
As a further improvement to the energy storage device, the energy storage device is a battery.
Drawings
FIG. 1 is a schematic diagram of a power battery system in an embodiment of the power battery system;
FIG. 2 is a schematic diagram of a battery module in an embodiment of a power battery system;
FIG. 3 is a schematic diagram of an equalization unit in an embodiment of a power battery system.
Detailed Description
The invention provides a power battery system, which is used for solving the problem that active balance control cannot be simultaneously carried out between battery modules and between a battery core and a battery core in a power battery in the prior art; correspondingly, the invention also provides an electric vehicle adopting the power battery system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power battery system comprises a battery pack, wherein battery cells in the battery pack are connected in series;
the battery pack comprises an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with the energy storage device;
each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell.
The technical scheme of the invention is further explained by combining the attached drawings.
Power battery system embodiment:
the embodiment provides a power battery system, as shown in fig. 1, comprising a battery pack and an energy storage device for equalization. A plurality of battery cores are arranged in the battery pack, the battery cores are connected in series, and the balance control is performed between the battery modules and among the battery cores in the battery modules by adopting an active balance control method.
The quantity of battery module sets up according to the actual demand among the power battery system, and the quantity of electric core also sets up according to the actual demand among each battery module. In the power battery system provided in this embodiment, n battery modules are provided, where n is a positive integer greater than 1.
Cell voltage monitoring devices with corresponding quantities are arranged in each battery module, and the quantity of the cell voltage monitoring devices arranged in each battery module is set according to requirements. Each cell voltage monitoring device is connected to the energy storage device in the same manner, and in this embodiment, each cell voltage monitoring device is described by taking the cell voltage monitoring device in the battery module 1 as an example.
M cell voltage monitoring devices are arranged in the battery module 1, wherein m is a positive integer larger than 1; the connection relationship between each cell voltage monitoring device and the energy storage device is shown in fig. 2, each cell voltage monitoring device is correspondingly provided with a module level transformer, the primary side of each module level transformer is connected with the energy storage device, and the secondary side of each module level transformer is connected with the corresponding cell voltage monitoring device. A corresponding controllable switch SWPi is arranged on a corresponding line connecting the primary side of the ith module level transformer with the energy storage device, a corresponding controllable switch SWNi is arranged on a line connecting the secondary side of the ith module level transformer with the corresponding cell voltage monitoring device, for example, a controllable switch SWP1 is arranged on a line connecting the primary side of the module level transformer corresponding to the cell voltage monitoring device 1 with the energy storage device, and a controllable switch SWN1 is arranged on a line connecting the secondary side with the cell voltage monitoring device 1.
The cell voltage monitoring devices are internally provided with a corresponding number of balancing units, and the specific number of the balancing units in each cell voltage monitoring device is set according to requirements. In this embodiment, taking one of the cell voltage monitoring devices as an example, it is assumed that three balancing units are arranged in the cell voltage monitoring device, and four cells are arranged in each balancing unit, as shown in fig. 3.
Each balancing unit is provided with a cell level transformer, and the secondary side of each cell level transformer is provided with four split windings which are respectively connected with corresponding cells in the corresponding balancing unit. The battery cells of the equalizing units in the same battery cell voltage monitoring device are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of the battery cell level transformer in each equalizing unit in the battery cell voltage monitoring device. In each balancing unit, a corresponding controllable switch is arranged on a circuit where each split winding on the secondary side of the cell level transformer in each balancing unit is connected with a corresponding cell, a controllable switch is arranged on a circuit where the primary side of the cell level transformer is connected with the cell, taking the balancing unit 1 as an example, a controllable switch SWp1 is arranged on a circuit where the primary side of the cell level transformer is connected with the cell, and corresponding controllable switches SWn1, SWn2, SWn3 and SWn4 are respectively arranged on a circuit where each split winding on the secondary side is connected with a corresponding cell.
According to the technical scheme provided by the embodiment, the battery cores in the corresponding balancing units are controlled in balancing mode by controlling the controllable switches connected to the primary side and the secondary side of each battery-level transformer, and the battery modules are controlled in balancing mode by controlling the controllable switches connected to the primary side and the secondary side of each module-level transformer.
Taking the equalizing unit 1 as an example, a specific manner of performing equalization control on the battery cells in the corresponding equalizing unit by controlling the controllable switches connected to the primary side and the secondary side of each battery cell level transformer is as follows: when the electric quantity of the first battery core is too low, the frequency and the duty ratio of the PWM wave for controlling the on-off of the controllable switch SWp1 and the controllable switch SWn1 are respectively adopted, wherein the PWM wave for controlling the controllable switch SWp1 is complementary with the PWM wave for controlling the controllable switch SWn1, and the controllable switch SWn1 is firstly controlled to be on; under the action of the cell-level transformer in the balancing unit 1, energy can be transferred to a first cell from a corresponding battery module;
when the electric quantity of the first battery cell is too high, the frequency and the duty ratio of the on/off of the controllable switch SWp1 and the controllable switch SWn1 are controlled by PWM waves respectively, wherein the PWM waves for controlling the controllable switch SWp1 are complementary with the PWM waves for controlling the module equalizing switch SWn1, and the module equalizing switch SWp1 is controlled to be on firstly; under the effect of the cell-level transformer in the balancing unit 1, energy can be transferred from the first cell to the corresponding battery module.
Taking the cell voltage monitoring device 1 in fig. 2 as an example, a specific manner of performing equalization control between each battery module by controlling a controllable switch connected to a primary side and a secondary side of a module-level transformer is as follows:
taking the case that the battery module needs to be supplied with power, the closing frequency and the duty ratio of the closing of the controllable switch SWP1 and the controllable switch SWN1 are controlled by adopting PWM waves respectively, wherein the control module controls the complementation between the PWM wave of the balanced switch SWP1 and the PWM wave of the controllable switch SWN1, and controls the closing of the controllable switch SWN1 firstly; under the action of the module balancing transformer corresponding to the battery module, the energy can be transferred from the energy storage device to the battery module 1.
In the embodiment, the energy storage device adopts a storage battery; as other embodiments, a super capacitor or other energy storage device capable of charge and discharge control may be used.
The embodiment of the vehicle is as follows:
the present embodiment provides an electric vehicle provided with a power battery system, which is the same as the power battery system provided in the above power battery embodiment, and the power battery system has been described in detail in the above power battery embodiment, and will not be described in detail here.
Claims (10)
1. A power battery system comprises a battery pack, wherein battery cells in the battery pack are connected in series;
the battery pack is characterized by comprising an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with the energy storage device;
each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell.
2. The power battery system of claim 1, wherein the secondary side of each cell-level transformer is connected to a corresponding cell via a respective split winding.
3. The power battery system of claim 1, wherein a corresponding first controllable switch is disposed on a line connecting a secondary side of each cell-level transformer to a corresponding cell, and a second controllable switch is disposed on a line connecting a primary side of a corresponding cell-level transformer after all cells of each balancing unit are connected in series.
4. The power battery system of claim 1, wherein a third controllable switch is provided on a line connecting the primary side of each modular-stage transformer to the energy storage device, and a fourth controllable switch is provided on a line connecting the secondary side of each modular-stage transformer to a corresponding battery module.
5. A power cell system according to claim 1, wherein the energy storage device is a battery.
6. An electric vehicle comprises a power battery, wherein the power battery comprises a battery pack, and battery cores in the battery pack are connected in series;
the battery pack is characterized by comprising an energy storage device for balancing and a plurality of battery modules; each battery module comprises a plurality of cell voltage monitoring devices and a corresponding number of module level transformers, and the primary side of each module level transformer is connected with the energy storage device;
each cell voltage monitoring device comprises a plurality of balancing units, each balancing unit comprises a cell level transformer and a plurality of cells, all the cells of each balancing unit are connected in series and then connected with the secondary side of the corresponding module level transformer and the primary side of each cell level transformer, and the secondary side of each cell level transformer is connected with the corresponding cell.
7. The electric vehicle of claim 6, wherein the secondary side of each cell-level transformer is connected to the corresponding cell through a corresponding split winding.
8. The electric vehicle according to claim 6, wherein a corresponding first controllable switch is disposed on a line connecting the secondary side of each cell-level transformer with the corresponding cell, and a second controllable switch is disposed on a line connecting the primary side of each cell-level transformer after all the cells of each balancing unit are connected in series.
9. The electric vehicle as claimed in claim 6, wherein a corresponding third controllable switch is provided on a line connecting the primary side of each modular-stage transformer with the energy storage device, and a corresponding fourth controllable switch is provided on a line connecting the secondary side of each modular-stage transformer with a corresponding battery module.
10. An electric vehicle in accordance with claim 6, characterized in that said energy storage means is a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891731.8A CN110861536A (en) | 2018-08-07 | 2018-08-07 | Electric vehicle and power battery system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891731.8A CN110861536A (en) | 2018-08-07 | 2018-08-07 | Electric vehicle and power battery system thereof |
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| CN110861536A true CN110861536A (en) | 2020-03-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206559063U (en) * | 2016-12-21 | 2017-10-13 | 宝沃汽车（中国）有限公司 | A kind of power battery pack balancer and electrokinetic cell system and vehicle |
| CN107294174A (en) * | 2017-07-25 | 2017-10-24 | 西安交通大学 | Equalizing circuit structure and method between a kind of battery cell and battery pack |
| CN107579552A (en) * | 2017-08-03 | 2018-01-12 | 深圳市科陆电子科技股份有限公司 | Battery pack balancing control method and device |
| CN208827610U (en) * | 2018-08-07 | 2019-05-07 | 郑州深澜动力科技有限公司 | Electric vehicle and its electrokinetic cell system |
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2018
- 2018-08-07 CN CN201810891731.8A patent/CN110861536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206559063U (en) * | 2016-12-21 | 2017-10-13 | 宝沃汽车（中国）有限公司 | A kind of power battery pack balancer and electrokinetic cell system and vehicle |
| CN107294174A (en) * | 2017-07-25 | 2017-10-24 | 西安交通大学 | Equalizing circuit structure and method between a kind of battery cell and battery pack |
| CN107579552A (en) * | 2017-08-03 | 2018-01-12 | 深圳市科陆电子科技股份有限公司 | Battery pack balancing control method and device |
| CN208827610U (en) * | 2018-08-07 | 2019-05-07 | 郑州深澜动力科技有限公司 | Electric vehicle and its electrokinetic cell system |
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