CN114243856A - Electric vehicle battery management system with compatible monocell and bicell - Google Patents

Electric vehicle battery management system with compatible monocell and bicell Download PDF

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Publication number
CN114243856A
CN114243856A CN202111618264.XA CN202111618264A CN114243856A CN 114243856 A CN114243856 A CN 114243856A CN 202111618264 A CN202111618264 A CN 202111618264A CN 114243856 A CN114243856 A CN 114243856A
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China
Prior art keywords
battery pack
battery
electric vehicle
relay
fuse
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Pending
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CN202111618264.XA
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Chinese (zh)
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许力文
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Individual
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Individual
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Priority to CN202111618264.XA priority Critical patent/CN114243856A/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
    • H02J7/0013—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect 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
    • H02J7/0063—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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention provides a battery management system of an electric vehicle with compatible monocells and double batteries, and relates to the technical field of electric vehicles. The system is arranged on an electric vehicle body and comprises a power distribution unit, a first battery pack and a second battery pack, wherein the power distribution unit, the first battery pack and the second battery pack are arranged on the electric vehicle body, the second battery pack is detachably connected with the electric vehicle body, the first battery pack and the second battery pack are connected in parallel at high voltage under the condition that the second battery pack is installed, the first BMS and the second BMS are connected and work in coordination to control, monitor and protect the whole battery system, and the first BMS and the second BMS are connected with a VCU (vehicle control unit) through a low-voltage wiring harness. The VCU of the vehicle controller controls the first battery pack and the second battery pack to be compatible to form double batteries to supply power for the electric vehicle, so that more electric energy is provided for the electric vehicle, the time waste caused by charging the electric vehicle when the electric vehicle runs for a long distance is avoided, and the sufficient endurance mileage is ensured, thereby better supporting the long-distance running of the electric vehicle.

Description

Electric vehicle battery management system with compatible monocell and bicell
Technical Field
The invention relates to the technical field of electric vehicles, in particular to an electric vehicle battery management system with compatible single batteries and double batteries.
Background
Along with the development of science and technology, the electric vehicle receives more and more attention from the society. Electric vehicles, namely electric drive vehicles, are also known as electric drive vehicles. Electric vehicles are classified into alternating current electric vehicles and direct current electric vehicles. Generally, an electric vehicle is a vehicle that uses a battery as an energy source, and converts electric energy into mechanical energy through a controller, a motor and other components to move so as to control the current and change the speed.
Most of electric vehicles only need to span a short distance in daily normal running, and although the energy carried by the first battery pack can meet most daily use, the scene of needing long-distance running cannot be met.
Accordingly, a battery management system for an electric vehicle in which a single battery and a dual battery are compatible is proposed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide an electric vehicle battery management system with compatible monocells and double batteries, which is used for solving the problem that the monocells cannot support long-distance running of an electric vehicle due to long charging time and short endurance mileage of the batteries loaded on the current electric vehicle in the prior art.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a compatible electric motor car battery management system of monocell and bi-battery, set up on electric motor car body, it is including setting up the power distribution unit on electric motor car body, first battery package and second battery package, the second battery package can be dismantled with electric motor car body and be connected, first battery package is parallelly connected with the second battery package, the second battery package includes the second BMS, first DC/DC module and relay J1, the second BMS is parallelly connected with relay J1, first battery package includes first BMS, first BMS and second BMS pass through the low pressure pencil and connect whole vehicle control unit VCU. The first battery pack is provided with a high-voltage interface X2, the second battery pack is provided with a high-voltage interface X3, and the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable.
In some embodiments of the present invention, the first battery pack further includes a first battery pack, the first battery pack is connected to a first BMS, a fuse FU7 is connected to a positive electrode of the first battery pack, the other end of the fuse FU7 is connected to one end of a manual maintenance switch S1, the manual maintenance switch S1 is connected to a relay KA1 and a relay KA2 at the same time, a resistor R1 is connected to a relay KA2, a common end of the resistor R1 and a common end of the relay KA1 are connected to a high voltage interface X1, a common end of the manual maintenance switch S1 and a common end of the relay KA5 are connected to a high voltage interface X2 at the same time, a negative electrode of the first battery pack is connected to one end of the manual maintenance switch S1, a common end of the manual maintenance switch S1 and a common end of the relay KA3 are connected to the high voltage interface X2, the relay KA3 is connected to the high voltage interface X1 at the same time, and the first BMS is connected to the complete VCU.
In some embodiments of the present invention, the second battery pack includes a second battery pack and a second BMS connected to the second battery pack, a positive electrode of the second battery pack is connected to a positive terminal of the high voltage interface X3 via a fuse FU1 and a relay J1, a negative electrode of the second battery pack is connected to a negative terminal of the high voltage interface X3 via a relay J1, and the second BMS is connected to the vehicle control unit VCU.
In some embodiments of the present invention, the first DC/DC module is connected in parallel with relay J1.
In some embodiments of the present invention, the power distribution unit is connected with both a front driving unit and a rear driving unit.
In some embodiments of the present invention, the above power distribution unit comprises fuse FU4 and fuse FU5, one end of fuse FU4 is connected to the positive terminal of the first battery pack, the other end of fuse FU4 is connected to the dc charging unit via relay KA4, one end of fuse FU5 is connected to the positive terminal of the first battery pack, the other end of fuse FU5 is connected to the OBC, and the positive terminal of the first battery pack is connected to the common terminal of the front and rear drive units via fuse FU 6.
In some embodiments of the present invention, the power distribution unit comprises a distribution portion comprising at least one distribution circuit comprising fuse FU2, fuse FU2 having one end connected to the positive terminal of the first battery pack and fuse FU2 having the other end connected to connector H1.
In some embodiments of the present invention, the above-mentioned electric vehicle battery management system with single-battery and dual-battery compatibility further comprises a cooling device, and the cooling device is connected with the first battery pack.
In some embodiments of the present invention, a cooling pipe is disposed between the cooling device and the first battery pack.
In some embodiments of the invention, the second battery pack is connected in series between the cooling device and the first battery pack.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides an electric vehicle battery management system with compatible monocells and double batteries, which is arranged on an electric vehicle body and comprises a power distribution unit, a first battery pack and a second battery pack, wherein the power distribution unit, the first battery pack and the second battery pack are arranged on the electric vehicle body, the second battery pack is detachably connected with the electric vehicle body, the first battery pack and the second battery pack are connected in parallel, and a Vehicle Control Unit (VCU) is connected with the first BMS of the first battery pack and the second BMS of the second battery pack. The high-voltage interface X2 is arranged on the first battery pack, the high-voltage interface X3 is arranged on the second battery pack, the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable, when the electric vehicle is powered in a single battery mode, the VCU of the whole vehicle controller controls the first battery pack to output electric power to the power distribution unit, and various vehicles of the electric vehicle acquire voltage through the power distribution unit. If the electric vehicle needs to run for a long distance, the electric vehicle needs to be replaced by a double-battery mode. First, the start BMS controls to open the second battery pack relay J1, connect the high voltage interface X2 and the high voltage interface X3 through a cable, and connect the communication lines of the first battery pack and the second battery pack. And starting the first DC/DC module to balance the voltages of the first battery pack and the second battery pack, so that the direct-current voltages of the first battery pack and the second battery pack are equal. Next, relay J1 is closed and the second BMS deactivates the first DC/DC module. Then start vehicle control unit VCU, activate first battery package and second battery package, vehicle control unit VCU controls first battery package and second battery package and carries out the compatible formation double cell and for the electric motor car power supply, and then provides more electric energy for the electric motor car, has avoided charging the electric motor car and waste time when long distance traveles, has guaranteed sufficient continuation of the journey mileage to support the electric motor car long distance to travel better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a battery management system for an electric vehicle compatible with a single battery and a dual battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dual battery installation according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electric vehicle with dual batteries compatible according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating operation of a single cell of an electric vehicle according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of cooling of a single cell according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a dual battery cooling system according to an embodiment of the present invention.
Icon: 1-a first battery pack; 2-a second battery pack; 3-a front drive unit; 4-a rear drive unit; 5-a direct current charging unit; 6-an alternating current charging unit; 7-a first BMS; 8-a second BMS; 9-a dispensing section; 10-a power distribution unit; 11-a cooling device; 12-a cooling tube; 13-a first battery; 14-a second battery; 15-a first DC/DC module; 16-a second DC/DC module; 17-vehicle control unit VCU.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Example 1
Referring to fig. 1, fig. 3 and fig. 4, fig. 1 is a schematic structural diagram of an electric vehicle battery management system with a single battery and a double battery compatible according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of an electric vehicle with a double battery compatible according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of an electric vehicle single battery operation according to an embodiment of the present invention. The embodiment of the application provides a compatible electric motor car battery management system of monocell and bi-battery, set up on the electric motor car body, it is including setting up power distribution unit 10, first battery package 1 and second battery package 2 on the electric motor car body, second battery package 2 and electric motor car body detachable connection, first battery package 1 and second battery package 2 are parallelly connected, connect vehicle control unit VCU17 through the low pressure pencil between first BMS7 of first battery package 1 and the second BMS8 of second battery package 2. The first battery pack 1 is provided with a high-voltage interface X2, the second battery pack 2 is provided with a high-voltage interface X3, and the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable.
Specifically, the first battery pack 1 and the second battery pack 2 are operated in parallel at high voltage. When the electric vehicle is powered by the single-battery mode, the vehicle control unit VCU17 controls the first battery pack 1 to output electric power to the power distribution unit 10, and various vehicles of the electric vehicle obtain voltage through the power distribution unit 10. If the electric vehicle needs to run for a long distance, the electric vehicle needs to be replaced by a double-battery mode. Firstly, a2 nd battery pack is mechanically installed, a cooling pipeline is connected, a2 nd battery pack relay J1 is opened, the first DC/DC module 15 is started to control/limit current, a high-voltage interface X2 and a high-voltage interface X3 are connected through cables, and a communication line of the first battery pack 1 and a communication line of the second battery pack 2 are connected with a low-voltage line of an automobile. The first DC/DC module 15 is controlled to equalize the voltages of the first battery pack 1 and the second battery pack 2, so that the DC voltages of the first battery pack 1 and the second battery pack 2 are equal. Next, relay J1 is closed, and the parallel connection of the two battery packs is completed, and the first DC/DC module 15 can be taken out of service. Then start vehicle control unit VCU17, activate first battery package 1 and second battery package 2, vehicle control unit VCU17 controls first battery package 1 and second battery package 2 and carries out the compatible double cell that forms and supply power for the electric motor car, and then provides more electric energy for the electric motor car, has avoided charging the electric motor car when long distance is gone and waste time, has guaranteed sufficient continuation of the journey mileage to support the electric motor car long distance to go better.
In the implementation process, the second battery pack 2 may be in a battery replacement mode, and at this time, the dual battery operation modes may be divided into the following two modes: the first mode is a pure battery replacement working mode, and a manual maintenance switch S1 in the first battery pack 1 is turned on to enable the battery cell module not to participate in operation all the time. The first BMS7 and the second BMS8 cooperatively control the first battery pack 1 and the second battery pack 2 to seamlessly complete the power-on and power-off process of the second battery pack, thereby separately providing energy for the operation of the vehicle by the second battery pack. The second is a double-battery pack working mode, specifically, the first battery pack 1 participates in vehicle operation power supply, after the second battery pack 2 is replaced, the relay J1 in the second battery pack 2 is opened, under the condition that the high-voltage open-circuit voltage of the first battery pack 1 and the high-voltage open-circuit voltage of the second battery pack 2 are unequal, the second battery pack 2 and the first battery pack 1 supply power together through the first DC/DC15, and the first battery pack 1 is charged simultaneously when the working condition allows. When the difference between the high-voltage open-circuit voltages of the first battery pack 1 and the second battery pack 2 is smaller than a certain value, the relay J1 can be closed, and the first DC/DC can be stopped from operating.
When the user needs to recover the power supply for the single battery, the high-voltage interface X2 and the high-voltage interface X3 are disconnected first to disconnect the communication lines of the first battery pack 1 and the second battery pack 2. The second battery pack 2 is then removed. And then, the vehicle control unit VCU17 is started, the first battery pack 1 is activated, and after self-checking, the first battery pack 1 enters a normal working state to provide power for the electric vehicle.
Generally, the user can drive the electric vehicle into the service center and rent the second battery pack 2. The capacities of the first battery pack 1 and the second battery pack 2 can be adjusted according to actual requirements.
In the above implementation process, in the life cycle of the whole vehicle, the second battery pack 2 can be detached and connected as required, under the condition of installing the second battery pack 2, the first battery pack 1 is connected in parallel with the second battery pack 2 at high voltage, the first BMS7 in the first battery pack 1 is connected with the second BMS8 in the second battery pack 2 through a low-voltage wiring harness system and coordinates to control, monitor and protect the whole battery system, and the whole vehicle controller VCU17 is connected with the first BMS7 and the second BMS8 at the same time to manage the energy of the battery system.
In some embodiments of the present embodiment, the first battery pack 1 includes a first battery pack 13 and a first BMS7 connected to the first battery pack 13, a fuse FU7 is connected to a positive terminal of the first battery pack 13, the other terminal of the fuse FU7 is connected to a positive terminal of a manual maintenance switch S1, the other terminal of the positive terminal of the manual maintenance switch S1 is connected to a relay KA1 and a relay KA2 at the same time, a resistor R1 is connected to a relay KA2, a resistor R1 and a first common terminal of the relay KA1 are connected to a positive terminal of a high-voltage interface X1, a connection point of the positive terminal of the manual maintenance switch S1 and the relay KA1 is connected to a positive terminal of a high-voltage interface X2 at the same time, a negative terminal of the manual maintenance switch S1 is connected to a negative terminal of the first battery pack 13, the other terminal of the manual maintenance switch S1 is connected to the relay KA3, the other terminal of the relay KA3 is connected to a high-voltage interface X1, a connection point of the negative terminal of the manual maintenance switch S1 and the relay KA3 is connected to a high-voltage interface X2, the first BMS7 is connected to the vehicle control unit VCU 17.
Specifically, the voltage of the first battery pack 13 is transmitted to the power distribution unit 10 through the high voltage interface X1, so as to supply power to various vehicles of the electric vehicle. First BMS7 can collect data such as terminal voltage of first battery pack 13, current of first battery pack 13, voltage of single cell of first battery pack 13, and temperature of first battery pack 13, and has functions of monitoring, controlling, diagnosing, and protecting first battery pack 13. The first BMS7 may be communicatively connected to other vehicles through the CAN to manage the first battery pack 13 so that it CAN normally supply power to the electric vehicle.
Wherein, the user can select the series-parallel connection mode of the batteries of the first battery pack 13 according to the actual situation so as to achieve better space distribution effect.
In some embodiments of the present embodiment, the second battery pack 2 includes a second battery pack 14 and a second BMS8 connected to the second battery pack 14, a positive electrode of the second battery pack 14 is connected to the high voltage interface X3 via a fuse FU1 and a switch S1 in sequence, a negative electrode of the second battery pack 14 is connected to the high voltage interface X3 via a switch S1, and the second BMS8 is connected to the vehicle control unit VCU 17.
Specifically, the voltage of the second battery pack 14 is transmitted to the power distribution unit 10 via the high-voltage interface X3. The second BMS8 can collect data of the terminal voltage of the second battery pack 14, the current of the second battery pack 14, the voltage of a single cell of the second battery pack 14, the temperature of the second battery pack 14, and the like, and has the functions of monitoring, controlling, diagnosing and protecting the second battery pack 14. The second BMS8 may be communicatively connected to other vehicles through the CAN to manage the second battery pack 14 to normally supply power to the electric vehicle.
In some embodiments of the present embodiment, the first DC/DC module 15 is located inside the second battery pack 2, and the first DC/DC module 15 is connected in parallel to the relay J1. In the initial connection state, the relay J1 is turned on, the first DC/DC module 15 is activated to equalize the voltages of the first and second battery packs 1 and 2 so that the DC voltages of the first and second battery packs 1 and 2 are equal, and then the relay J1 is turned on, and the first DC/DC module 15 is turned off.
In some embodiments of the present embodiment, the power distribution unit 10 is connected with the front driving unit 3 and the rear driving unit 4 at the same time. Specifically, the front driving unit 3 and the rear driving unit 4 can obtain power through the power distribution unit 10, so as to drive the front wheels and the rear wheels of the electric vehicle to move.
Wherein, the power distribution unit 10 can be individually connected to the front driving unit 3 or the rear driving unit 4 according to actual requirements.
The front drive unit 3 is a power distribution system for front wheel drive, i.e., for driving only a pair of front wheels of an electric vehicle. The rear drive unit 4 refers to a rear wheel drive, i.e., a power distribution manner that drives only the rear wheels of the electric vehicle.
In some embodiments of the present embodiment, the power distribution unit 10 includes a fuse FU4 and a fuse FU5, one end of the fuse FU4 is connected to the positive electrode of the first battery pack 1, the other end of the fuse FU4 is connected to the dc charging unit 5 via a relay KA4, one end of the fuse FU5 is connected to the positive electrode of the first battery pack 1, the other end of the fuse FU5 is connected to the OBC, and the positive electrode of the first battery pack 1 is connected to the common terminal of the front driving unit 3 and the rear driving unit 4 via a fuse FU 6.
Specifically, the voltage of the first battery pack 1 is transmitted to the power distribution unit 10 via the high voltage interface X1, so that the OBC, the front drive unit 3, and the rear drive unit 4 are powered by the power distribution power.
Wherein, the OBC is a vehicle-mounted charger.
As an implementation manner of the present embodiment, the power distribution unit 10 further includes a second DC/DC module 16, and the second DC/DC module 16 is connected to the first battery pack 1. The second DC/DC module 16 may equalize the voltages of the first battery pack 1 and the power distribution unit 10 so that the direct current voltages of the first battery pack 1 and the power distribution unit 10 are equal.
In another embodiment of the present embodiment, the OBC is connected to an ac charging unit 6.
In some embodiments of this embodiment, the power distribution unit 10 comprises a distribution portion 9, the distribution portion 9 comprises at least one distribution circuit, the distribution circuit comprises a fuse FU2, one end of the fuse FU2 is connected to the positive terminal of the first battery pack 1, and the other end of the fuse FU2 is connected to a connector H1.
Specifically, the distribution unit can distribute the voltage to some electric appliances, such as an air conditioner, a heat pump, an electric heater, and the like, so as to supply power to the electric appliances, thereby facilitating the use of users.
Wherein, the user can set up the distribution circuit according to the actual conditions. In use, the user inserts the charging head of the electrical appliance into the connector H1 for charging.
Referring to fig. 5, fig. 5 is a schematic view illustrating a structure of cooling a single cell according to an embodiment of the present invention. The electric vehicle battery management system compatible with the single battery and the double batteries further comprises a cooling device 11, and the cooling device 11 is connected with the first battery pack 1. Specifically, the first battery pack 1 includes a liquid cooling system therein. When the unit cells are operated, the liquid cooling system of the first battery pack 1 is connected to the cooling device 11, and the first BMS7 cooperates with the cooling device 11 to cool the liquid cooling system of the first battery pack 1.
In some embodiments of the present embodiment, a cooling pipe 12 is disposed between the cooling device 11 and the first battery pack 1. Specifically, the first battery pack 1 can be effectively cooled by the cooling pipe 12.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a dual battery cooling system according to an embodiment of the present invention. The second battery pack 2 is connected in series between the cooling device 11 and the first battery pack 1. Specifically, the first battery pack 1 and the second battery pack 2 each include a liquid cooling system therein. When the dual batteries are operated, the liquid cooling system of the first battery pack 1 and the liquid cooling system of the second battery pack 2 are coupled to the cooling device 11 in a serial manner, and the first BMS7 and the second BMS8 cooperate with the cooling device 11 to cool the liquid cooling system of the first battery pack 1 and the liquid cooling system of the second battery pack 2.
In some embodiments of the present embodiment, when the dual batteries are operated, the liquid cooling system of the first battery pack 1 and the liquid cooling system of the second battery pack 2 may also be connected in parallel to the cooling device 11.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural diagram of a dual battery installation according to an embodiment of the present invention. The first battery pack 1 is provided with a high-voltage interface X2 and a high-voltage interface X4, the second battery pack 2 is provided with a high-voltage interface X3 and a high-voltage interface X5, the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable, and the high-voltage interface X4 is used for being connected with the high-voltage interface X5 through the first DC/DC module 15. Specifically, the first battery pack 1 and the second battery pack 2 are operated in parallel at high voltage. When the electric vehicle is powered by the single-battery mode, the vehicle control unit VCU17 controls the first battery pack 1 to output electric power to the power distribution unit 10, and various vehicles of the electric vehicle obtain voltage through the power distribution unit 10. If the electric vehicle needs to run for a long distance, the electric vehicle needs to be replaced by a double-battery mode. First, the high voltage interface X2 and the high voltage interface X3 are connected by a cable to connect the communication lines of the first battery pack 1 and the second battery pack 2. The high voltage interface X4 and the high voltage interface X5 are connected to the first DC/DC module 15 through cables, and the first DC/DC module 15 is activated to equalize the voltages of the first battery pack 1 and the second battery pack 2, so that the DC voltages of the first battery pack 1 and the second battery pack 2 are equal. Next, the high voltage interface X4 and the high voltage interface X5 are disconnected and the cable and the first DC/DC module 15 are removed. Then start vehicle control unit VCU17, activate first battery package 1 and second battery package 2, vehicle control unit VCU17 controls first battery package 1 and second battery package 2 and carries out the compatible double cell that forms and supply power for the electric motor car, and then provides more electric energy for the electric motor car, has avoided charging the electric motor car when long distance is gone and waste time, has guaranteed sufficient continuation of the journey mileage to support the electric motor car long distance to go better.
To sum up, the compatible electric motor car battery management system of monocell and bi-battery that this application embodiment provided sets up on the electric motor car body, and it is including setting up power distribution unit 10, first battery package 1 and second battery package 2 on the electric motor car body, and second battery package 2 can be dismantled with the electric motor car body and be connected, and first battery package 1 is parallelly connected with second battery package 2, is connected with vehicle control unit VCU17 between first battery package 1 and the second battery package 2. The first battery pack 1 is provided with a high-voltage interface X2, the second battery pack 2 is provided with a high-voltage interface X3, the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable, and the first DC/DC module 15 is connected with the relay J1. When the electric vehicle is powered by the single-battery mode, the vehicle control unit VCU17 controls the first battery pack 1 to output electric power to the power distribution unit 10, and various vehicles of the electric vehicle obtain voltage through the power distribution unit 10. If the electric vehicle needs to run for a long distance, the electric vehicle needs to be replaced by a double-battery mode. First, the high voltage interface X2 and the high voltage interface X3 are connected by a cable to connect the communication lines of the first battery pack 1 and the second battery pack 2. The relay J1 in the second battery pack 2 is turned on, and the first DC/DC module 15 is started to equalize the voltages of the first battery pack 1 and the second battery pack 2, so that the DC voltages of the first battery pack 1 and the second battery pack 2 are equalized. Subsequently, the relay J1 is closed, and the first DC/DC module 15 is deactivated. Then start vehicle control unit VCU17, activate first battery package 1 and second battery package 2, vehicle control unit VCU17 controls first battery package 1 and second battery package 2 and carries out the compatible double cell that forms and supply power for the electric motor car, and then provides more electric energy for the electric motor car, has avoided charging the electric motor car when long distance is gone and waste time, has guaranteed sufficient continuation of the journey mileage to support the electric motor car long distance to go better.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A battery management system of an electric vehicle with compatible single batteries and double batteries is arranged on an electric vehicle body and is characterized by comprising a power distribution unit, a first battery pack and a second battery pack, wherein the power distribution unit, the first battery pack and the second battery pack are arranged on the electric vehicle body, the second battery pack is detachably connected with the electric vehicle body, the first battery pack is connected with the second battery pack in parallel, the second battery pack comprises a second BMS, a first DC/DC module and a relay J1, the second BMS is connected with the relay J1 in parallel, the first battery pack comprises a first BMS, and the first BMS and the second BMS are connected with a VCU (vehicle control unit) through a low-voltage wire harness;
the first battery pack is provided with a high-voltage interface X2, the second battery pack is provided with a high-voltage interface X3, and the high-voltage interface X2 is used for being connected with the high-voltage interface X3 through a cable.
2. The single and dual battery compatible electric vehicle battery management system according to claim 1, wherein the first battery pack further comprises a first battery pack connected to the first BMS, a fuse FU7 is connected to a positive electrode of the first battery pack, the other end of the fuse FU7 is connected to one end of a manual service switch S1, the manual service switch S1 is connected to a relay KA1 and a relay KA2 at the same time, the relay KA2 is connected to a resistor R1, a common end of the resistor R1 and the relay KA1 is connected to a high voltage interface X1, a common end of the manual service switch S1 and the relay KA5 is connected to a high voltage interface X2 at the same time, a negative electrode of the first battery pack is connected to one end of a manual service switch S1, the manual service switch S1 is connected to a high voltage interface X2 via a relay KA3, the relay KA3 is connected to a high voltage interface X1 at the same time, the first BMS is connected with the VCU.
3. The single and dual battery compatible electric vehicle battery management system of claim 1, wherein the second battery pack comprises a second battery pack and a second BMS connected to the second battery pack, wherein a positive electrode of the second battery pack is connected to a positive terminal of a high voltage interface X3 via a fuse FU1 and a relay J1 in sequence, a negative electrode of the second battery pack is connected to a negative terminal of a high voltage interface X3 via a relay J1, and the second BMS is connected to the vehicle controller VCU.
4. A single and dual battery compatible electric vehicle battery management system as recited in claim 3, wherein the first DC/DC module is connected in parallel with a relay J1.
5. A single-and dual-battery compatible electric vehicle battery management system as recited in claim 1, wherein a front drive unit and a rear drive unit are connected to the power distribution unit at the same time.
6. The single and dual battery compatible electric vehicle battery management system of claim 5, wherein the power distribution unit comprises fuse FU4 and fuse FU5, one end of fuse FU4 is connected with the positive pole of the first battery pack, the other end of fuse FU4 is connected to a DC charging unit via relay KA4, one end of fuse FU5 is connected with the positive pole of the first battery pack, the other end of fuse FU5 is connected to an OBC, the positive pole of the first battery pack is connected to the common of the front and rear drive units via fuse FU 6.
7. A cell and dual cell compatible electric vehicle battery management system according to claim 1 wherein said power distribution unit comprises a distribution section comprising at least one distribution circuit comprising fuse FU2, one end of said fuse FU2 being connected to the positive terminal of said first battery pack and the other end of said fuse FU2 being connected to connector H1.
8. A single and dual battery compatible electric vehicle battery management system as recited in claim 1, further comprising a cooling device coupled to the first battery pack.
9. A single and dual battery compatible electric vehicle battery management system as recited in claim 8, wherein a cooling tube is disposed between the cooling device and the first battery pack.
10. A single-and dual-battery compatible electric vehicle battery management system as recited in claim 8 wherein the second battery pack is connected in series between the cooling device and the first battery pack.
CN202111618264.XA 2021-12-27 2021-12-27 Electric vehicle battery management system with compatible monocell and bicell Pending CN114243856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111618264.XA CN114243856A (en) 2021-12-27 2021-12-27 Electric vehicle battery management system with compatible monocell and bicell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111618264.XA CN114243856A (en) 2021-12-27 2021-12-27 Electric vehicle battery management system with compatible monocell and bicell

Publications (1)

Publication Number Publication Date
CN114243856A true CN114243856A (en) 2022-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111618264.XA Pending CN114243856A (en) 2021-12-27 2021-12-27 Electric vehicle battery management system with compatible monocell and bicell

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Country Link
CN (1) CN114243856A (en)

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