CN104297691A - Battery pack health status diagnostic system and method - Google Patents

Battery pack health status diagnostic system and method Download PDF

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Publication number
CN104297691A
CN104297691A CN201410514208.5A CN201410514208A CN104297691A CN 104297691 A CN104297691 A CN 104297691A CN 201410514208 A CN201410514208 A CN 201410514208A CN 104297691 A CN104297691 A CN 104297691A
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China
Prior art keywords
battery
signal
electric
management information
battery management
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CN201410514208.5A
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Chinese (zh)
Inventor
吴红杰
邵惠民
胡光洋
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SHANGHAI JINENG POWER SYSTEMS Co Ltd
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SHANGHAI JINENG POWER SYSTEMS Co Ltd
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Priority to CN201410514208.5A priority Critical patent/CN104297691A/en
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Abstract

The invention provides a battery pack health status diagnostic system and method. The battery pack health status diagnostic system comprises a battery management information input device and an information processing device. The battery management information input device is used for receiving and/or collecting battery management information of a battery pack under a charging and discharging state, and sending the battery management information to the information processing device. The information processing device is used for comparing the battery management information received from the battery management information input device with a preset threshold value, and if any signal in the battery management information continuously exceeds the threshold value by a set time, it is determined that a breakdown happens to the battery pack. According to the battery pack health status diagnostic system and method, data such as a battery SOC, battery internal resistance, the change rate of the battery internal resistance and the change rate of temperatures are considered to estimate the health status of batteries, the advantage that the health status of the batteries is estimated more completely and precisely is achieved, and safety operation of the battery pack is facilitated.

Description

Battery state-of-health diagnostic system and method
Technical field
The present invention relates to battery state-of-health diagnostic field, particularly, relate to the system and method for battery state-of-health diagnosis.
Background technology
Storage battery for electric vehicle group is combined by the mode of several accumulators by serial or parallel connection.The electric battery in use inevitably situation such as aging, overheated, superpotential, even leakage, internal resistance increase, is called that cell health state worsens.Cell health state worsens the function that directly can affect consumer, as running distance of eletric vehicles shortening, electric tool power drop, the reduction of electric motor car driving power etc., causes the use affecting user.Therefore, the method and apparatus of invention battery state-of-health diagnosis is necessary.
The mode that the health status of electric battery worsens is varied, mainly contains electric battery unevenness, cell overcharge, overdischarge, cell is overheated, cell internal short-circuit, battery capacity decay, the internal resistance of cell increases.
Known battery state-of-health detection method estimates according to the voltage of battery or the life-span of temperature to battery, monitors the state of charge of rechargeable battery and be supplied to rechargeable battery or come from the quantity of ampere hour of rechargeable battery as: patent open (announcement) number patent documentation " battery health in monitoring HVAC system " that is CN102687088A; Patent open (announcement) number is the trend that " the online life-span prediction method of a kind of battery system " of CN102765331A proposes by charging-discharging performances global attenuation in battery system use procedure, dopes the method for battery system current age.
Consider that the mode that cell health state worsens is varied, there is a lot of limitation in the method that prior art only carries out predicting according to cell voltage and temperature, therefore be necessary that designing the data such as a kind of consideration battery SOC, the internal resistance of cell, internal resistance of cell rate of change, rate of temperature change carries out cell health state estimation, and the method for classification process is carried out to cell health state.
Summary of the invention
For defect of the prior art, the object of this invention is to provide the system and method for a kind of battery state-of-health diagnosis.
According to a kind of battery state-of-health diagnostic system provided by the invention, comprise as lower device:
Battery management message input device, for receiving and/or gather the battery management information of electric battery under charging and discharging state, and battery management information is sent to signal conditioning package, wherein, described battery management information comprises following signal:
-battery voltage signal;
-stack current signal;
-battery temperature signal;
Signal conditioning package, for will the battery management information of battery management message input device be received from, compared with the threshold value preset, if any one signal in described battery management information is continued above the time that threshold value one sets, then assert that electric battery breaks down.
Preferably, battery failures grade output unit is also comprised;
Signal conditioning package judges the fault level of electric battery according to battery management information, and the defeated fault level according to electric battery of battery failures grade output unit exports corresponding diagnostic trouble code, and wherein, described diagnostic trouble code is used to indicate the fault level of electric battery.
Preferably, also comprise electric battery and export major loop protective device;
When fault level is catastrophic failure, electric battery exports the output loop that major loop protective device disconnects electric battery.
Preferably, battery management information also comprise following any one or appoint the signal of multiple battery group:
-module voltage signal;
-SOC signal;
-SOH signal;
-insulation resistance;
The order of-vehicle control device.
Preferably, also comprise as lower device:
Electrifying timing sequence device, for controlling the power up of electric battery;
Lower electric timing unit, for controlling the steering logic of lower electric process.
According to a kind of battery state-of-health diagnostic method provided by the invention, comprise the steps:
Receive and/or gather the battery management information of electric battery under charging and discharging state, wherein, described battery management information comprises following signal:
-battery voltage signal;
-stack current signal;
-battery temperature signal;
By battery management information, compared with the threshold value preset, if any one signal in described battery management information is continued above the time that threshold value one sets, then assert that electric battery breaks down.
Preferably, also comprise the steps:
Judge the fault level of electric battery according to battery management information, export corresponding diagnostic trouble code according to the fault level of electric battery, wherein, described diagnostic trouble code is used to indicate the fault level of electric battery.
Preferably, when fault level is catastrophic failure, disconnect the output loop of electric battery.
Preferably, battery management information also comprise following any one or appoint the signal of multiple battery group:
-module voltage signal;
-SOC signal;
-SOH signal;
-insulation resistance;
The order of-vehicle control device.
Preferably, also comprise the steps:
Control the power up of electric battery;
Control the steering logic of lower electric process.
Compared with prior art, the present invention has following beneficial effect:
1, comprehensively analyze cell health state and judge: the judgment principle only considering voltage, temperature, electric current compared with classic method, judgement of the present invention is more accurate.
2, carried out classification to the malfunction of battery, had the diagnostic trouble code determined, the Output rusults of condition adjudgement definitely.
3, multi-stage protection Functional Design has been carried out to electric battery, guaranteed battery operated in the usable range of safety.Thus extend the serviceable life of battery.
4, consider the data such as battery SOC, the internal resistance of cell, internal resistance of cell rate of change, rate of temperature change and carry out cell health state estimation.
5, there is cell health state and estimate more perfect, more accurate feature, be conducive to electric battery safe operation.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the input and output of fault diagnosis subroutine.
Fig. 2 is battery failure diagnostic process block diagram.
Fig. 3 is electric battery report fault FB(flow block).
Fig. 4 is battery management system theory diagram.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Comprehensive descision technology of the present invention, have employed a kind of multiple input single output Controlling model, the method of comprehensive descision comprises: judgement is carried out in battery charge and discharge process, the electric current of battery, temperature, voltage are simultaneously as Rule of judgment, namely when battery at a certain temperature, when carrying out charge or discharge by a certain electric current, cell voltage, electric current or constant temperature exceed threshold value regular hour section, just judge the fault level of battery.Instead of in classic method, no matter whether battery is in charging and discharging state, only rely on cell voltage to judge.
According to a kind of battery state-of-health diagnostic system provided by the invention, comprise battery management message input device, signal conditioning package, battery failures grade output unit, electric battery output major loop protective device, electrifying timing sequence device, lower electric timing unit, battery status information output unit.
Battery management message input device, comprises voltage and current signal input media, temperature signal input media, SOC (battery charging state) input media, SOH (cell health state) input media, insulation resistance input media.
Signal conditioning package, comprises CPU device, data storage device.
CPU device, for calculating, judging and decision-making, specifically, according to battery management message input device obtain battery pack current, busbar voltage, module voltage and the threshold value that presets compare, and then determine Output rusults according to comparative result.
Data storage device, for the data of storage battery within nearest a period of time, also for storing the threshold value preset.
Voltage and current signal input media, for receiving voltage, the current signal of electric battery, and carrying out pre-service, being converted into the analog or digital signal that CPU device can identify, being input to CPU device.
Temperature signal input media, for gathering the temperature signal of battery, be transformed into digital signal and be input to CPU device SOC (battery charging state) input media, for according to certain model counting cell charging state, such as Current integrating method, voltage look-up table, voltage change ratio method etc.
SOH (cell health state) input media, for calculating the health degree of electric battery, exceed the duration of threshold value by calculating the electric current of battery, voltage, temperature, inequality extent and above-mentioned variable, then obtain the health status of electric battery according to certain model.
Insulation resistance input media, for calculating the insulation impedance between electric battery and vehicle body ground, this device by measure respectively battery anode and negative pole to vehicle body connect time, flow through the voltage of sampling resistor, again according to the amplification coefficient of Ohm law and circuit, calculate the insulation impedance of both positive and negative polarity to vehicle body ground.
Electrifying timing sequence device, for controlling the power up of electric battery, comprising communication standby condition, electric machine controller standby condition, battery pre-charging voltage status etc.
Lower electric timing unit, for controlling the steering logic of lower electric process, the steering logic of electricity under receiving car load, or battery failure grade code, the execution order that this device will judge in lower electric process.
Battery status information output unit, for exporting the information such as state-of-charge, total voltage, module voltage, monomer ceiling voltage, monomer minimum voltage, monomer temperature of battery, Output rusults is given to entire car controller or the Displaying Meter of automobile.
Battery failures grade output unit, for exporting the health status information of battery, namely exports diagnostic trouble code.Usually, in electric motor car, battery status output unit carries out State-output by CAN.
Battery exports major loop protective device (relay opening and closing IO), for the protection of electric battery not by overcharge or overdischarge.When relay disconnects, electric battery output loop disconnects, and during relay closes, the output loop of electric battery is connected, and battery can be moved or be charged to battery by charging set by drive motor.
As shown in Figure 1, the output quantity of following 3 batteries is shown, the relay opening and closing output quantity of battery status information, battery failures level signal, battery in Fig. 1, wherein:
Battery status information, comprise the electric current of battery, battery voltage, module voltage, temperature, SOC, SOH, insulation resistance, the order of vehicle control device (HCU), according to CAN communication agreement, passing ratio, side-play amounts etc. calculate specific as follows: as carried out charge or discharge when battery, according to the principle of current sensor, the current acquisition unit of battery export one with the simulating signal of current in proportion, CPU carries out analog to digital conversion, obtain the numerical value of electric current, then according to CAN communication agreement, by being multiplied by scale-up factor, the technological means such as plus-minus side-play amount, obtain the numerical value meeting CAN communication standard.Voltage, temperature etc. all adopt similar computing method.
Battery failures level signal, calculates according to cell health state diagnosis algorithm, and this is main contents of the present invention.The foundation of health status diagnosis comprises electric current, battery voltage, module voltage, temperature, SOC, SOH insulation resistance of battery.
Wherein, cell health state diagnosis algorithm, specifically comprise step: first judge whether battery current, temperature, voltage, SOC etc. numerically exceed the numerical value prestored, simultaneously, a counter is had to start counting, when exceeding threshold value and lasting till official hour, then judge that battery signal goes beyond the scope, how much determine fault level according to off-limits.
The relay opening and closing output quantity of battery, is judge according to battery failure grade, when battery failures grade is more than 3 grades, is considered to electric battery and there is potential safety hazard, and relay exports and disconnects.
The fault diagnosis of battery management system refers to and detects electric battery, judges the malfunction of battery according to detection signal, and sends diagnostic trouble code to entire car controller, and takes corresponding action, prevents the method and apparatus of the damage of electric battery.
(1) establishment of electrokinetic cell failure sorted and diagnostic trouble code
Electrokinetic cell and the contingent failure of removal of battery management system can be divided into according to generation position: the diagnosis of sensor fault diagnosis, battery failures, actuator fault diagnosis, BCU built in diagnostics.
Electrokinetic cell and battery management system send to the diagnostic trouble code of entire car controller to be divided into 4 grades: 0,1,2,3, are expressed as:
0: system worked well
1: level fault, entire car controller should limit input-output power.
2: secondary failure, stop immediately.
3: catastrophic failure, stop immediately, car load needs to deliver to maintenance station.
Level fault comprises:
Battery information exceedes the scope that battery allows, and such as lithium ion battery voltage is charged to the some values between (3.6-4.2V);
Secondary failure comprises:
When the discharge and recharge of battery small area analysis, the scope that battery parameter exceeds regulation is more, the some numerical value of e.g., cell voltage exceedes (3.8-4.35) V.
Catastrophic failure comprises:
In battery charge and discharge process, detect the safety value that the threshold value obtaining battery exceedes permission, when exceeding this safety value, may there is catastrophic failure in electric battery.Such as, cell voltage exceedes the some numerical value of (4-4.5) V.
The algorithm of failure judgement grade is:
Illustrate, when cell voltage is more than 4V, and when continuing (5-10) second, think electric battery generation secondary failure.
In CAN, devise some bytes, adopt the form of zone bit to represent the particular type of fault, so that the judgement of entire car controller and operation.
(2) battery failures Diagnostic Strategy
The method for diagnosing faults of electrokinetic cell, mainly according to the battery status information that battery sampling circuit obtains, by the Evaluation and Prediction carried out battery operation state, judges battery fault condition.And send to entire car controller and Displaying Meter by CAN.
The formulating rules of Fault Diagnosis Strategy is: accuracy of judgement, both without failing to report, also without wrong report.
Fault diagnosis is whole BMS (BATTERY MANAGEMENT SYSTEM, battery management system) sub-function module designing, the initial conditions of this functional module comprises: the electric current of electrokinetic cell, busbar voltage, module voltage, temperature, SOC, SOH, insulation resistance, and Output rusults comprises: CAN signal, relay IO actuating signal.
Setting fault diagnosis threshold value is most important to fault diagnosis, and the establishing method of threshold value, mainly according to the test figure that battery production business provides, considers the technical requirement of car load, reaches harmonious.Threshold value set by battery production business is often considered to protect battery as far as possible, and the control of car load needs first to consider personnel and vehicle safety when being necessary.
A kind of determination methods of fault diagnosis of simplification as shown in the figure, first carries out threshold decision to sampled signal, for reaching the accuracy of judgement, needing to confirm judged result, after confirming n time, still there is phenomenon of the failure, then generate fault flag.Those skilled in the art can set threshold value according to actual needs.
Fig. 4 is the circuit structure of system provided by the present invention, and wherein, right-hand part is the concrete structure of battery output loop protective device.Slave computer, by gathering cell voltage, electric current, temperature signal, is sent to supervisory controller by CAN, and supervisory controller is by the fault level of diagnosis battery.When battery failures grade is more than 3 grades, when needing to protect, driver module sends drive singal, disconnects corresponding relay.Thus the protection realized battery.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (10)

1. a battery state-of-health diagnostic system, is characterized in that, comprises as lower device:
Battery management message input device, for receiving and/or gather the battery management information of electric battery under charging and discharging state, and battery management information is sent to signal conditioning package, wherein, described battery management information comprises following signal:
-battery voltage signal;
-stack current signal;
-battery temperature signal;
Signal conditioning package, for will the battery management information of battery management message input device be received from, compared with the threshold value preset, if any one signal in described battery management information is continued above the time that threshold value one sets, then assert that electric battery breaks down.
2. battery state-of-health diagnostic system according to claim 1, is characterized in that, also comprises battery failures grade output unit;
Signal conditioning package judges the fault level of electric battery according to battery management information, and the defeated fault level according to electric battery of battery failures grade output unit exports corresponding diagnostic trouble code, and wherein, described diagnostic trouble code is used to indicate the fault level of electric battery.
3. battery state-of-health diagnostic system according to claim 2, is characterized in that, also comprises electric battery and exports major loop protective device;
When fault level is catastrophic failure, electric battery exports the output loop that major loop protective device disconnects electric battery.
4. battery state-of-health diagnostic system according to claim 1, is characterized in that, battery management information also comprise following any one or appoint the signal of multiple battery group:
-module voltage signal;
-SOC signal;
-SOH signal;
-insulation resistance;
The order of-vehicle control device.
5. battery state-of-health diagnostic system according to claim 1, is characterized in that, also comprises as lower device:
Electrifying timing sequence device, for controlling the power up of electric battery;
Lower electric timing unit, for controlling the steering logic of lower electric process.
6. a battery state-of-health diagnostic method, is characterized in that, comprises the steps:
Receive and/or gather the battery management information of electric battery under charging and discharging state, wherein, described battery management information comprises following signal:
-battery voltage signal;
-stack current signal;
-battery temperature signal;
By battery management information, compared with the threshold value preset, if any one signal in described battery management information is continued above the time that threshold value one sets, then assert that electric battery breaks down.
7. battery state-of-health diagnostic method according to claim 6, is characterized in that, also comprise the steps:
Judge the fault level of electric battery according to battery management information, export corresponding diagnostic trouble code according to the fault level of electric battery, wherein, described diagnostic trouble code is used to indicate the fault level of electric battery.
8. battery state-of-health diagnostic method according to claim 7, is characterized in that, when fault level is catastrophic failure, disconnects the output loop of electric battery.
9. battery state-of-health diagnostic method according to claim 6, is characterized in that, battery management information also comprise following any one or appoint the signal of multiple battery group:
-module voltage signal;
-SOC signal;
-SOH signal;
-insulation resistance;
The order of-vehicle control device.
10. battery state-of-health diagnostic method according to claim 6, is characterized in that, also comprise the steps:
Control the power up of electric battery;
Control the steering logic of lower electric process.
CN201410514208.5A 2014-09-29 2014-09-29 Battery pack health status diagnostic system and method Pending CN104297691A (en)

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CN106199432A (en) * 2015-05-29 2016-12-07 Fev有限责任公司 Determine method and the cell system capable of recharging of rechargeable battery ageing state
CN106564387A (en) * 2016-10-14 2017-04-19 厦门金龙旅行车有限公司 Active safety control method based on super capacitor monitoring management system
CN106648616A (en) * 2016-11-16 2017-05-10 安徽锐能科技有限公司 Development method and development device of battery fault diagnostic program
CN106680723A (en) * 2016-12-09 2017-05-17 国网北京市电力公司 Method and device for monitoring running state of storage battery pack
CN106908741A (en) * 2017-04-26 2017-06-30 广州汽车集团股份有限公司 Power battery for hybrid electric vehicle group SOH evaluation methods and device
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CN106680723A (en) * 2016-12-09 2017-05-17 国网北京市电力公司 Method and device for monitoring running state of storage battery pack
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CN108248419A (en) * 2017-12-18 2018-07-06 蔚来汽车有限公司 Energy-storage battery charge-discharge system and method and relevant device
CN108363376A (en) * 2017-12-29 2018-08-03 北京智行鸿远汽车有限公司 A kind of Multifunctional battery packet simulating bench and its analogy method suitable for BMS system testings
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