CN205608156U - Battery SOH detection device based on machine charges - Google Patents

Abstract

The utility model belongs to the technical field of new forms of energy electric automobile charge, a battery SOH detection device based on machine charges is related to. When detecting battery SOH, monitoring module control controller makes the machine that charges carry out discharge mode and charge mode's switching, and the monitoring module sends discharge instruction or recharging instruction to battery BMS makes the battery discharge or charge, quick -witted data or the discharge process's the data through acquireing the charging process of charging to according to the above -mentioned data acquireed calculate obtain the battery can the capacity of emitting, further obtain battery SOH. The utility model discloses an adopt the detection the most accurate to battery SOH of discharge detection method, compensatied BMS and predictd the unsafe defect of SOH, guarantee that car SOC's prediction is accurate, promote user experience, provide the guidance of battery maintenance for the user. Simultaneously, also change the condition of the only single function of charging of machine of charging, accomplished to have carried out recycle with the exoelectric energy of batteries of electric vehicle, had fine economic benefits.

Description

A kind of battery SOH based on charger detects device

[technical field]

This utility model belongs to New-energy electric vehicle charging technique field, relates to a kind of battery SOH based on charger detection dress Put.

[background technology]

Energy crisis and environmental pollution have beaten alarm bell to the mankind, and the most how substituting traditional fuel-engined vehicle becomes people always Since arguement topic.At present application dynamical lithium-ion battery packs as the electric automobile of power source by the highest attention of people and green grass or young crops Look at.Having benefited from the support on policy that government constantly raises the price, and the continuous lifting of society environmental consciousness, charging basis, each place sets The Large scale construction executed, the electric automobile market of China has welcome the development of " blowout formula ".

The electrokinetic cell of one of the core component as electric automobile, its safety and life-span become each side's focus of attention, are also impacts The key factor of Development of Electric Vehicles.The health status of battery is to evaluate the important indicator of battery life, it is considered that electric automobile moves The SOH (health status of battery) of power set of cells is less than 80%, and battery just should be changed.Relevant battery management system (BMS) Accurately the health status (SOH) of estimation battery is the weak link of current research, and SOH estimation is inaccurate has become as current BMS A big defect.

Battery SOH defines: the health status (State of Health) of battery, along with the life-time service of battery, battery necessarily occurs Aging or deterioration, the health status of battery is on a declining curve.According to the related definition in industry, can be that battery SOH is defined as: Under the conditions of specified temp and partial discharge multiplying power, battery can release the ratio of capacity and new battery rated capacity.Measure SOH at present Have:

1, electric discharge: under specified conditions, battery is discharged, until cell voltage reaches blanking voltage, then the capacity can released It is i.e. the SOH of battery with the ratio of rated capacity.The method is the most also to be SOH measuring method the most accurately.Shortcoming is mesh Before cannot on-line measurement.

2, method drops in voltage suddenly: utilizes voltage suddenly to drop the relation with SOH and measures SOH.The method is simple and quick, but is nothing equally Method on-line checking, needs constant load, and accuracy is the most poor simultaneously.

3, resistance Commutation Law: the internal resistance of cell and SOH exist certain relation.By measuring the parameters such as voltage, electric current, temperature, Indirectly calculate internal resistance of cell value, then calculate according to the relation of battery SOH with the internal resistance of cell and try to achieve SOH.But the internal resistance of cell with SOH is the most linear, and change is the most little within a certain range, and the SOH error therefore measured is bigger.

4, cycle-index Commutation Law: estimate the SOH of battery according to the cycle-index of battery and the relation of battery SOH, this Method needs substantial amounts of experimental data to add up, and the diversity of different manufacturers difference battery types is bigger, and therefore the method does not possesses General applicability, and precision is the highest.

5, Impedance Analysis: obtain the impedance of battery according to the input current measurement of different frequency and estimate the SOH of battery.The party Method precision when low SOH is preferable, but needs substantial amounts of experiment to set up model, and cost is the highest simultaneously.

Electric automobile in actual motion, due to the lasting change of running environment, discharge load cannot realize under specified conditions constant Current discharge, it is impossible to accomplish to measure accurately the SOH of battery.And want to obtain that accurate SOH can only go to specify is electronic Vehicle maintenance point detects, and the process that detects is the most relatively cumbersome time-consumingly, affects the use of user.Battery accurately can not be obtained SOH, the SOC (battery remaining power or remaining driving mileage) of battery also can be inaccurate, will badly influence the use of user Experience, it is impossible to prompting user carries out maintenance or the replacing of battery in time.

Currently, electric automobile battery charger uniquely has with electric automobile during running as electric automobile and using also is mutual most alternately External equipment, its function can only be charged to electric automobile, passively charges according to the demand of battery BMS.Utilization is filled This feature of motor, when realizing mutual on charger, the SOH to batteries of electric automobile accurately detects, and will well solve to work as This defect front, and make charger preferably be utilized.

[utility model content]

For solving problems of the prior art, the purpose of this utility model is to provide a kind of battery SOH based on charger inspection Surveying device, this fills puts the SOH detection being capable of carrying out battery online, and also can be carried out back by the electric energy that battery is released Receive and utilize.

The purpose of this utility model is achieved by the following technical solution:

A kind of battery SOH based on charger detects device, including live part, discharge portion and controller, described charging Part include that monitoring module, described discharge portion include discharge module, described discharge module and controller respectively with monitoring module Connecting, discharge module is connected with controller.

Described live part also includes memory module, charging module, communication unit and data processing module, memory module, charging Module, communication unit and data processing module are connected with described monitoring module respectively.

Connecting on described discharge module has energy back feed device, described energy back feed device to connect respectively with electrical network and monitoring module Connect.

Charge circuit and discharge loop it is provided with on described controller.

Described discharge module is DC/DC dc power modular converter.

Described charging module is AC/DC power conversion module.

Connecting on described communication unit has user interface, user to send instruction by operating user interface to charger.

Described user interface includes mobile App, remote server and human-computer interaction interface.

The beneficial effects of the utility model are:

A kind of battery SOH based on charger of the present utility model detection device increase discharging function at charger system, by Connecting controller on monitoring module, charger self can be charged pattern and discharge mode the most according to demand by monitoring module Switching, simultaneously by the special communication protocol that running status between monitoring module and batteries of electric automobile BMS is credible, controlled Charger processed and battery are charged pattern and discharge mode switching, and charger obtains data or the number of discharge process of charging process According to, and battery SOH can be calculated according to the above-mentioned data obtained, therefore it is capable of battery SOH's by charger On-line checking.

Further, the discharge module in this utility model according to monitoring module send electric discharge algorithm by defeated for the energy released in battery Going out, when electric discharge, electric energy is flowed to electrical network by energy back feed device by discharge module, or flows to the battery connected on charger Energy-storage system, or flow to other battery charged connected on described charger, the problem solving energy regenerating, it is to avoid Energy waste.

This utility model achieves employing discharge examination method and detects battery SOH the most accurately, compensate for BMS and estimates SOH Inaccurate defect, it is ensured that the prediction of automobile SOC is accurate, promotes Consumer's Experience, provides the user the guidance of battery maintenance.With Time, have also been changed charger and only have the situation of single charge function, accomplished that the energy by batteries of electric automobile discharges is reclaimed Utilize, there are good economic benefits.

[accompanying drawing explanation]

Fig. 1 is that this utility model calculates overhaul flow chart during battery SOH with charging capacity；

Fig. 2 is that this utility model calculates overhaul flow chart during battery SOH with discharge capacity；

The connection diagram of energy-feedback power grid when Fig. 3 is this utility model detection battery SOH；

The connection diagram of energy feedback energy-storage system when Fig. 4 is this utility model detection battery SOH；

The connection diagram of energy feedback charging system when Fig. 5 is this utility model detection battery SOH.

[detailed description of the invention]

With detailed description of the invention, this utility model is described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 5, according to the technical problems to be solved in the utility model: for one of defect that BMS is maximum at present, SOH estimation is difficult or estimates inaccurate, and cannot be carried out on-line checking battery SOH when charging electric vehicle at present.

This utility model charging pusher side add discharging function, by monitoring module from the BMS of electric automobile obtain cell voltage, The parameters such as temperature, monitoring module makes battery carry out being discharged to, according to the discharge scheme of storage in memory module, cut-off condition of discharging, thus The simplest detection battery SOH of electric discharge the most accurately can be realized.The health status making battery accurately understands, it is possible to the most right Battery carries out operation and maintenance.

This utility model, after charging pusher side adds discharging function, changes charger and only has single charge function, make charging also have For the function of battery SOH detection, after charger adds discharging function simultaneously, the electric energy released by battery is used for other cars Charging, or is stored into energy-storage system, or feeds back to electrical network, the problem also solving energy regenerating, it is to avoid energy waste.

This utility model be the technical scheme is that

This charger, by the basis of the function of original charging, increases discharge module, and discharge module is connected with monitoring module, with Time also on monitoring unit connect controller, controller is connected with discharge module, increases the control of discharge mode in monitoring module, Charger self can be charged the switching of pattern and discharge mode, meanwhile, monitoring module the most according to demand by monitoring module By the special communication protocol that running status between batteries of electric automobile BMS is credible, monitoring module can control charger and electricity Pond is charged pattern and discharge mode automatically switches, and charger utilizes discharge mode to realize battery SOH detection and the energy content of battery is returned Receive.

After charger has been connected with electric automobile, monitoring module collects the battery types of battery BMS transmission, voltage, capacity etc. Parameter information, user passes through user interface, as mobile phone A PP or human-computer interaction interface send battery SOH detection to communication unit Instruction, this instruction is sent to monitoring module by communication unit, and monitoring module controls controller makes charger switch to discharge mode, and The communication instruction of battery discharge is sent to electric automobile BMS；

After electric discharge starts, battery BMS makes the electric energy in battery release from battery, and the electric energy of releasing enters electric discharge through controller Module, discharge module instructs according to the electric discharge that monitoring module sends and electric discharge algorithm output electric energy, and electric discharge algorithm is according to being built in advance The electric discharge of memory module battery starts the parameter informations such as condition, termination condition, discharge current and formulates.

In battery discharge procedure, monitoring module controls data memory module the storage voltage of discharge process, electric current, temperature, capacity Deng parameter information；After battery reaches to be discharged to cut-off condition, charger switches to charge mode, makes battery be charged, and data are deposited Storage module record also stores the data such as the charging voltage of this charging process, electric current, temperature, capacity.Data processing unit is by obtaining The discharge data taken and charge data carry out Treatment Analysis, obtain the released capacity that battery is current, can release capacity and rated capacity Ratio be i.e. the SOH of battery.Then by communication unit, testing result information is passed to electric automobile and user.

Or, after charger has been connected with electric automobile, monitoring module receives the instruction of detection battery SOH, monitoring module Controlling controller makes charger switch to charge mode, and sends the communication instruction of charging to battery BMS；After charging starts, electricity Pond BMS makes battery charge according to this instruction, until battery is fully charged, monitoring module controls controller again makes charger switch to put Power mode, and the communication instruction of electric discharge is sent to battery BMS, battery BMS makes battery discharge according to this instruction, until Battery discharge reaches cut-off condition；In battery discharge procedure, monitoring module controls putting of data memory module this discharge process of record Electricity data also transmit the data to data processing module, and data processing module processes the SOH obtaining battery by data, finally Charger makes battery fully charged by the control of monitoring module again.

When above-mentioned battery discharge, discharge module according to the electric discharge communication instruction of monitoring module and the discharge scheme of transmission by battery Energy is converted to the electric energy of appropriate format, discharge module will conversion after electric energy be used in same charging system connect another just At the vehicle charging of charging terminal, or for giving the battery energy storage system charging being connected on this charger connect, or pass through energy Amount feedback device is converted into the alternating current meeting grid requirements, grid-connected after by energy-feedback power grid.

The calculating of battery SOH can be in the following ways:

Formula (1): SOH=Cch × η × λ/Ce；

Cch is that battery discharge refills electric charging capacity to cut-off condition；

Ce is the rated capacity of battery；

η is the conversion coefficient of charging capacity and specified conditions discharge capacity, battery producer or experiment test determine；

λ is temperature compensation coefficient, battery producer or experiment test determine.

Formula (2): SOH=Cdch/Ce=Idch × t × K × λ/Ce；

In formula: Cdch is fully charged battery discharge to the discharge capacity of cut-off condition；

Ce is the rated capacity of battery；

Idch is discharge current, specifies by relevant criterion or man of Battery Plant；

T is for being discharged to cut-off condition total time；

K is discharge-rate coefficient, battery producer or experiment test determine；

λ is temperature compensation coefficient, battery producer or experiment test determine.

Embodiment one, as it is shown in figure 1, after electric automobile and charger connect, user is by mobile phone A PP, cloud platform, remote Journey server or charger man machine interface issue the instruction of detection battery SOH, after monitoring module receives instruction, control to connect back to Road switches to discharge mode, meanwhile, monitoring module by SOH detection electric discharge instruction be sent to electric automobile BMS, charger according to The charging method stored in memory module is to battery discharge to cut-off condition of discharging, the discharge count of memory module this discharge process of record According to.

Then, monitoring module controls charger again and switches to charge mode, sends charging instruction, prison to electric automobile BMS simultaneously Control module makes battery fully charged by the charging method stored in memory module, the charging number of memory module this charging process of record Carry out charge and discharge data processing according to, data processing module and obtain battery discharge to refilling the charging capacity of electricity after blanking voltage, Battery SOH is calculated again by formula (1).Detection data are sent to electric automobile, by communication mould finally by monitoring module Testing result is sent to user by block, and detection terminates, and charger stops.

Embodiment two, as in figure 2 it is shown, after electric automobile and charger connect, user is by mobile phone A PP, cloud platform, remote Journey server or charger man machine interface issue the instruction of detection battery SOH, after monitoring module receives instruction, control charger Switching to charge mode, meanwhile, charging instruction is sent to electric automobile BMS by monitoring module, and charger is according in memory module The charging method stored is that battery is fully charged, the charge data of memory module this charging process of record.

Then, monitoring module controls link circuit again and switches to discharge mode, and meanwhile, monitoring module sends to electric automobile BMS Battery SOH detection electric discharge instruction, charger is that battery is put by battery according to the charging method stored in memory module in charger This discharge data is also sent to data processing module, monitoring module to cut-off condition of discharging, this discharge data of memory module record by electricity Control charger switchback charge mode more fully charged to battery.

Meanwhile, charge and discharge data are carried out processing and obtain fully charged battery discharge putting to cut-off condition by data processing module Capacitance i.e. the released capacity of battery, calculates battery SOH by formula (2).Finally by monitoring module, detection data are passed Giving electric automobile, send testing result to user by communication module, detection terminates, and the fully charged rear charger of battery stops.

As it is shown on figure 3, during embodiment one or embodiment two detect battery SOH, when battery discharge, monitoring Module by CAN line communication issue detection SOH order to controller (controller is the device comprising two relay switches, Being additionally provided with charge circuit and discharge loop on controller, a switch connects charge circuit, and another switch connects discharge loop), Discharge loop connected by controller, simultaneously switches off charge circuit, and charging module does not works, and (charging module is AC/DC power modulus of conversion Block, during work, the AC rectification of electrical network is converted into direct current and supplies electricity to charging electric vehicle by charging module), monitoring module also by CAN line communication issue electric discharge order and electric discharge algorithm signal to discharge module, (discharge module is DC/DC dc power modulus of conversion Block), issue work order and make energy back feed device start inversion work to energy back feed device, monitor energy back feed device simultaneously Duty, battery is discharged by discharge module according to the control of discharge algorithm in memory module, and control of discharge algorithm is based on Electric discharge initial temperature, discharge current, electric discharge start what the parameter information such as condition, termination condition was formulated, until battery discharge is to cut-off Voltage, during battery discharge, the DC power conversion that battery is released by discharge module becomes inversion electricity in energy back feed device Voltage required for road, then the alternating current meeting feedback grid it is transformed into through energy back feed device inversion, energy back feed device includes DC/AC inverter circuit and signal comparator circuit, the converting direct-current power into alternating-current power that battery is released by DC/AC inverter circuit, signal The voltage sine wave signal that comparison circuit is sampled by electrical network, as modulating wave, compares with the signal of inversion, through overregulating and putting After great, export control signal, make voltage and the same amplitude of line voltage, same frequency, same phase that energy back feed device export, then Circuit filters off harmonic wave, the electric energy feedback electrical network that battery is released by energy back feed device after filtering, is unlikely to make this part electric energy wave Expense is fallen, and has preferable economic benefit.

As shown in Figure 4, during embodiment one or embodiment two detect battery SOH, when battery discharge, monitoring The order that module issues detection SOH by CAN line communication is connected discharge loop to controller, controller, is simultaneously switched off charging Loop, monitoring module controls charging module and does not works, and monitoring module issues electric discharge order and electric discharge algorithm also by CAN line communication Signal is to discharge module, and battery is discharged by discharge module according to the control of discharge algorithm in memory module, until battery discharge To blanking voltage, the DC power conversion that battery is released by discharge module becomes the electrical energy form required for battery energy storage system charging, The battery energy storage system that the electric energy that battery is released by discharge module is used for being connected on charging system is charged, and discharge energy obtains To recycling, there is preferable economic benefit.

As it is shown in figure 5, during embodiment one or embodiment two detect battery SOH, when battery discharge, monitoring The order that module issues detection SOH by CAN line communication is connected discharge loop to controller, controller, is simultaneously switched off charging Loop, monitoring module controls charging module and does not works, and then monitoring module issues electric discharge order by CAN line communication and electric discharge is calculated Method signal is to discharge module, and battery is discharged according to the control of discharge algorithm in memory module by discharge module, until battery is put Electricity is to blanking voltage, and the DC power conversion that battery is released by discharge module becomes to meet other that connect on this charging system and fills The charging voltage of the electric automobile demand of electricity, for the charging of other electric automobile, this charging system is connectable to few two chargings Automobile, but it is not limited only to two, discharge energy has obtained good process, has preferable economic benefit.

Claims (8)

1. a battery SOH based on charger detects device, it is characterized in that, including live part, discharge portion and controller, described live part includes monitoring module, described discharge portion includes discharge module, described discharge module and controller are connected with monitoring module respectively, and discharge module is connected with controller.

A kind of battery SOH based on charger the most according to claim 1 detects device, it is characterized in that, described live part also includes that memory module, charging module, communication unit and data processing module, memory module, charging module, communication unit and data processing module are connected with described monitoring module respectively.

A kind of battery SOH based on charger the most according to claim 1 detects device, it is characterised in that connecting on described discharge module has energy back feed device, described energy back feed device to be connected respectively with electrical network and monitoring module.

A kind of battery SOH based on charger the most according to claim 1 detects device, it is characterised in that be provided with charge circuit and discharge loop on described controller.

A kind of battery SOH based on charger the most according to claim 1 detects device, it is characterised in that described discharge module is DC/DC dc power modular converter.

A kind of battery SOH based on charger the most according to claim 1 detects device, it is characterised in that described charging module is AC/DC power conversion module.

A kind of battery SOH based on charger the most according to claim 2 detects device, it is characterised in that connecting on described communication unit has user interface, user to send instruction by operating user interface to charger.

A kind of battery SOH based on charger the most according to claim 7 detects device, it is characterised in that described user interface includes mobile App, remote server and human-computer interaction interface.