CN102148522A - Storage battery pack control method and system - Google Patents
Storage battery pack control method and system Download PDFInfo
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- CN102148522A CN102148522A CN2011101141037A CN201110114103A CN102148522A CN 102148522 A CN102148522 A CN 102148522A CN 2011101141037 A CN2011101141037 A CN 2011101141037A CN 201110114103 A CN201110114103 A CN 201110114103A CN 102148522 A CN102148522 A CN 102148522A
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Abstract
The invention discloses a storage battery pack control method and system, which comprises the steps which are as follows: voltages of each storage battery are collected; the voltages of each storage battery are mutually compared to obtain a maximum voltage, a minimum voltage, and a voltage difference between the maximum voltage and the minimum voltage; then the charging-discharging state of the storage battery pack is judged; when the storage battery pack is under the charging state, the sizes of the voltage difference and a first preset value are judged; and when the voltage difference is equal to or more than the first preset value, a discharging command is generated to discharge the storage battery matched with the maximum voltage; when the storage battery pack is under the discharging state, the sizes of the voltage difference and a second preset value are judged; and when the voltage difference is equal to the second preset value, a command for reducing the system power is generated and is transmitted to a vehicle control system. The method can detect the voltages of each storage battery; moreover, when the consistency between single storage battery is destroyed, the problem of damaging the storage battery pack caused by overlarge difference between single storage batteries can be avoided through the means such as discharging or reducing the power, etc.
Description
Technical field
The application relates to the battery technology field, particularly relates to a kind of batteries control method and system.
Background technology
The continuous pollution of environment, the aggravation consumption of petroleum-based energy impel pure electric automobile to become the object that each automobile vendor of various countries falls over each other to study, and lead acid accumulator relies on its cheap price advantage, have occupied most of market share of electric automobile energy storage device.Lead acid accumulator on the electric automobile is generally the battery pack that the more piece lead acid accumulator is formed, if lead acid accumulator improper use, then will cause battery sulfuration, battery capacity is dwindled and shorten useful life, this will directly influence the car load operating position of electric automobile.
At present; use the electric automobile of lead-acid battery to adopt controller to come monitoring usually to lead acid accumulator; controller is judged the battery operating position by detecting the car load assembled battery total voltage, reduces power when cell voltage reaches at predefined under-voltage or turn-offs output to reach the protective effect to battery over-discharge when it detects.
By to prior art research, the applicant finds: use the electric motor car of lead-acid battery group as electrokinetic cell, in the vehicle operating process, entire car controller can only detect the total voltage of whole battery group, and can't detect the operating position of every batteries.When difference occurring between the battery individuality but total voltage when not showing just can't measure and handle accordingly the situation of every batteries, so will cause some battery the phenomenon of overdischarge to occur for a long time.Carrying out charging process also is the same, charger detects whole battery group voltage and controls charging process according to this via its output, so when charging, also can't detect the charge condition of each batteries, the situation that may cause single battery to occur overcharging.If the long-term overdischarge of single battery or overcharge, its battery capacity will reduce, and will shorten useful life, and the consistency of whole Battery pack will be damaged, thereby makes car load show problems such as insufficient driving range or charging be discontented.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of batteries control method and system, this system can be in the charge and discharge process, voltage to the every batteries in the lead-acid batteries detects, and when the consistency between the single-unit storage battery is destroyed, by means such as discharge or reduction power, can avoid the problem of and then damage batteries excessive owing to difference between the single-unit storage battery
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of batteries control method, described batteries comprises the more piece storage battery,, comprising:
Gather the voltage of every joint storage battery in the described batteries;
The voltage of every joint storage battery of being gathered is compared mutually, obtain the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage;
Judge the charging and discharging state of described batteries;
If described batteries is in charged state, judge the size of described voltage difference and first preset value, when described voltage difference during, generate discharge and instruct more than or equal to first preset value, the corresponding storage battery of described ceiling voltage is discharged;
If described batteries when being in discharge condition, is judged the size of described voltage difference and second preset value,, generate the instruction of reduction drive system power, and send to vehicle control system when described voltage difference during more than or equal to second preset value.
Preferably, judge the charging and discharging state of described batteries according to the sense of current of described batteries.
Preferably, after the pairing storage battery of described ceiling voltage is discharged, further comprise:
Record to described ceiling voltage corresponding storage battery time of discharging;
Discharge time and Preset Time are compared;
When equal Preset Time discharge time, gather the voltage of every joint storage battery in the described batteries; And the voltage of every joint storage battery of described collection compared mutually, obtain the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage;
Judge the relation of the described voltage difference and first preset value, when described voltage difference during, generate and reduce the charging current instruction, and send to charging device more than or equal to first preset value.
Preferably, generation further comprises after reducing the instruction of drive system power:
Gather the voltage of every joint storage battery in the described batteries.
Preferably, this method further comprises:
Gather the ambient temperature signal of at least two positions in the described batteries, and convert described temperature signal to magnitude of voltage;
Described magnitude of voltage and predeterminated voltage value are compared;
When described magnitude of voltage during, generate alarm command, and described alarm command is sent to vehicle control system, and take safeguard measure by vehicle control system more than or equal to the predeterminated voltage value.
A kind of batteries control system, described batteries comprises the more piece storage battery,, comprising: at least one detection module, a plurality of discharge Executive Module and control module, wherein:
The two poles of the earth of a joint or more piece storage battery are connected in the first input end of described at least one detection module and the described batteries, first output is connected with control module, described at least one detection module is used for gathering the voltage of the every joint storage battery of described batteries, and the voltage that collects is sent to described control module;
Every joint storage battery all is connected with a discharge Executive Module in the described batteries, the control end of described discharge Executive Module is connected with second output of the detection module that is connected with this joint storage battery, and described discharge Executive Module is used for this coupled joint storage battery is discharged;
Described control module is connected with vehicle control system, and described control module comprises: charging and discharging state judging unit, voltage comparison unit, discharge instruction generation unit and attenuating drive system power generation unit, wherein:
Described charging and discharging state judging unit is used to judge that described batteries is in charged state or discharge condition;
Described voltage comparison unit, the voltage that is used for the every joint storage battery that will gather relatively obtains the difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage mutually, and described voltage difference is compared with first preset value or second preset value;
Described discharge instruction generation unit is used for when batteries is in charged state and described voltage difference during more than or equal to first preset value, generates discharge and instructs, and send to the described discharge Executive Module that is connected with the corresponding storage battery of described ceiling voltage;
Described attenuating drive system power generation unit is used for when batteries is in discharge condition and described voltage difference during more than or equal to second preset value, generates the instruction that reduces drive system power, and sends to vehicle control system.
Preferably, in described at least one detection module each detection module with at the most three the joint storage batterys be connected, every joint storage battery only is connected with a detection module in the described batteries.
Preferably, described discharge Executive Module comprises discharge resistance and power switch pipe, wherein:
The two poles of the earth of described discharge resistance and discharge switch and storage battery are in series, and the control end of described power switch pipe is as the control end of discharge Executive Module, and described power switch pipe receives discharge instruction back conducting.
Preferably, described control module further comprises: discharge time record cell, wherein:
Described discharge time record cell, the discharge time that is used to write down described discharge Executive Module.
Preferably, this system further comprises: a plurality of temperature sensors and alarm command generation unit, wherein:
Every joint storage battery is provided with at least one described temperature sensor in the described batteries, described temperature sensor is connected with second input of described detection module, be used to detect the temperature signal of described storage battery, and be input in the described detection module after converting described temperature signal to magnitude of voltage;
Described detection module sends to described voltage comparison unit with described magnitude of voltage, and when described magnitude of voltage during more than or equal to described predeterminated voltage value, described alarm command generation unit generates alarm command, and described alarm command is sent to vehicle control system.
Preferably, this system further comprises: bleeder circuit, wherein:
Described bleeder circuit the every joint storage battery of described batteries and with detection module that this joint storage battery is connected between, and two inputs of described bleeder circuit are connected with the two poles of the earth of described storage battery, and output is connected with the first input end of described detection module.
By above technical scheme as seen, this batteries control method that the embodiment of the present application provides, at first gather the voltage of every joint storage battery in the batteries, and the voltage of every joint storage battery of being gathered is compared mutually, obtain the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage, judge the charging and discharging state of batteries then: when being in charged state, judge the size of the voltage difference and first preset value, and when voltage difference during greater than first preset value, generate the discharge instruction, the corresponding storage battery of ceiling voltage is discharged; When being in discharge condition; then judge the size of the voltage difference and second preset value; and when voltage difference during greater than second preset value; generate the instruction that reduces drive system power; and send to vehicle control system; reducing the power output of batteries, vehicle control system according to this reduce drive system power instruction with the Power Limitation of vehicle in suitable scope, storage battery is protected.
Compared with prior art, this batteries control method can detect the voltage of the every joint storage battery in the batteries, and charging and discharging state according to batteries, with ceiling voltage in the single-unit storage battery, the difference of minimum voltage and first preset value or second preset value compare, can in time understand the difference between the single-unit storage battery, and when ceiling voltage and minimum voltage surpass preset value, be when consistency is destroyed between the single-unit storage battery, by corresponding processing, as discharge or reduction drive system power etc., can avoid occurring that individual cell is overcharged or overdischarge, and then damage the problem of batteries because difference is excessive between the single-unit storage battery.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of a kind of batteries control method that Fig. 1 provides for the embodiment of the present application;
The schematic flow sheet of the another kind of batteries control method that Fig. 2 provides for the embodiment of the present application;
The schematic flow sheet of the third batteries control method that Fig. 3 provides for the embodiment of the present application;
The structural representation of a kind of batteries control system that Fig. 4 provides for the embodiment of the present application;
Fig. 5 is detection module among Fig. 4 and the partial structurtes schematic diagram between the storage battery;
A kind of structural representation of the control module that Fig. 6 provides for the embodiment of the present application;
The structural representation of the another kind of batteries control system that Fig. 7 provides for the embodiment of the present application;
The another kind of structural representation of the control module that Fig. 8 provides for the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand technical scheme among the application better, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
The schematic flow sheet of a kind of batteries control method that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, this batteries control method of providing of the embodiment of the present application comprises:
Step S100: the voltage of gathering every joint storage battery in the batteries.
Because existing storage battery group control method, usually the total voltage that detects whole batteries is judged the operating position of battery, so just can't fully understand the situation of every joint storage battery in the batteries, so difference occurs when between the battery cell, and the total voltage of batteries is normal, will batteries will damage owing to improper use so.
In this batteries control method of the application, to gather respectively the voltage of the every joint storage battery in the batteries at first exactly, so just can grasp the change in voltage situation of every joint storage battery.
Step S200: the voltage to every joint storage battery of gathering compares mutually, obtains the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage.
After collecting the voltage of every joint storage battery in the batteries, the voltage of every joint storage battery is compared one by one, and the voltage of the storage battery that magnitude of voltage is the highest is as ceiling voltage, the voltage of the storage battery that magnitude of voltage is minimum deducts ceiling voltage minimum voltage in addition and can also obtain both voltage differences as minimum voltage.The ceiling voltage that obtains and the voltage difference of minimum voltage are follow-up to consistency is judged between the single-unit storage battery in the batteries foundation.
Step S300: judge the charging and discharging state of batteries,
Because batteries is when when charging and discharge, the change in voltage difference of wherein every joint storage battery, when charging, the voltage of every joint storage battery is the trend of rising, and when discharge, the voltage of every joint storage battery is on a declining curve.So when the situation of every joint storage battery is judged in to batteries, judge the charging and discharging state of batteries earlier.
In the embodiment of the present application, judge the charging and discharging state of batteries by the sense of current of judging batteries, when the sense of current when flowing into, batteries is in charged state, when the sense of current when flowing out, then batteries is in discharge condition.In addition, adopt the sense of current to do to judge that the charging and discharging of accumulator state is the application's a embodiment, judge that for the charging and discharging state of batteries multiple mode is arranged, in other embodiment of this Shen, can also judge the charging and discharging state of batteries by upper limit threshold and lower threshold are set.。
When batteries is in charged state, carry out step S311:, carry out step S321 when storage battery is in discharge condition.
Step S311: the voltage difference that judgement obtains and the size of first preset value.
First preset value is when battery charging, the ceiling voltage that is allowed in the single-unit storage battery in the batteries and the maximum difference of minimum voltage, and it can react the consistency between the single-unit storage battery.In the embodiment of the present application, first preset value is chosen as 0.1V, certain s own situation according to different batteries, first preset value can also advance to adjust, when ceiling voltage and minimum voltage more than or equal to first preset value, think that then the consistency between the single battery is destroyed in the batteries, need handle the single-unit storage battery, when voltage difference during, carry out step S312 more than or equal to first preset value.
Step S312: generate the discharge instruction, the pairing storage battery of ceiling voltage is discharged.
In charging process, the difference of single-unit storage battery ceiling voltage and minimum voltage has surpassed first predetermined threshold value in batteries, this reflection batteries is in charging process, the single-unit storage battery fill the spot speed difference, so need discharge, to keep in the batteries consistency between the more piece storage battery to the pairing storage battery of ceiling voltage.
Step S321: the voltage difference that judgement obtains and the size of second preset value.。
Second preset value is when batteries is discharged, the ceiling voltage that is allowed in the single-unit storage battery in the batteries and the maximum difference of minimum voltage, and it reacts the consistency between the single-unit storage battery equally.In the embodiment of the present application, second preset value is chosen as 1V, when ceiling voltage and minimum voltage more than or equal to and preset value thinks that then batteries consistency between the single battery in discharge process is destroyed, when voltage difference during, carry out step S322 more than or equal to second preset value.
Step S322: generate to reduce the drive system power instruction, and will reduce the drive system power instruction and send to vehicle control system.
In discharge process, the ceiling voltage in batteries and the difference of minimum voltage have surpassed second predetermined threshold value, this reaction batteries is when discharge, the velocity of discharge difference of single-unit electric power storage, the situation that occurs overdischarge for fear of certain joint storage battery, so need to adjust the whole power output of batteries, respectively save difference between the storage battery to reduce batteries, thereby avoid because certain joint battery overdischarge causes damaging and puts in order the group storage battery group.After the step S322, return the voltage data that step S100 gathers batteries again.
Pass through above-mentioned steps, when no matter when battery charging, still discharging, this batteries control method all can be gathered the voltage of the every joint storage battery in the batteries, whether the consistency of judging single-unit storage battery in the batteries is destroyed, and after the consistency of single-unit storage battery is destroyed, by power output to pairing battery discharge of ceiling voltage or the whole group storage battery group of reduction, guarantee the balance between the single-unit storage battery in the batteries, thereby can avoid occurring that individual cell is overcharged or overdischarge, and then cause obviously not good enough problem of the whole result of use of batteries because difference is excessive between the single-unit storage battery.
In addition, after step S312, can't realize voltage difference is reduced in first preset value to the pairing battery discharging of ceiling voltage a period of time if continue.In other embodiment of the application, as shown in Figure 2, this method can also comprise:
Step S400: the time that record discharges to the pairing storage battery of ceiling voltage.
Step S401: discharge time and Preset Time are compared.
When equal Preset Time discharge time, carry out step S315.
Step S402: gather the voltage of every joint storage battery once more, relatively obtain the voltage difference of ceiling voltage and minimum voltage, and the size of the inferior comparative voltage difference and first preset value.
Step S402 is identical with the content of step S100～S200, and in the embodiment of the present application, Preset Time is chosen as 10-60s, and after pairing battery discharging continues one section to ceiling voltage, carries out step S403.
Step S403: the size of judging the discharge back voltage difference and first preset value.
When voltage difference during, carry out step S404 more than or equal to first preset value.When voltage difference during, then return step S100 less than first preset value.
Step S404: generation reduces the charging current instruction, and sends to vehicle control system.
After promptly the pairing battery discharging of ceiling voltage being continued one section, if voltage difference is still more than or equal to first preset value, so just generate and reduce the charging current instruction, and reduce charging current by vehicle control system control charger, to realize reducing the voltage of the pairing storage battery of ceiling voltage.In the embodiment of the present application, the charging current minimum can be reduced to zero, promptly stops storage battery being charged.
In addition, in order to detect the temperature of the every joint storage battery of batteries, in another embodiment of the application, as shown in Figure 3, when accumulator battery voltage was detected, this method can also comprise:
Step S500: gather the temperature signal of at least two positions in the batteries, and convert temperature signal to magnitude of voltage.
Step S600: magnitude of voltage after will changing and predeterminated voltage value compare.
In this step, the predeterminated voltage value can be set according to the actual conditions of storage battery.
Magnitude of voltage after conversion carries out step S700 during more than or equal to the predeterminated voltage value, and the magnitude of voltage after conversion returns step S500 less than the predeterminated voltage value.
Step S700: generate alarm command, and alarm command is sent to vehicle control system, report to the police.
The embodiment of the present application also provides a kind of batteries control system, the structural representation of a kind of batteries control system that Fig. 4 provides for the embodiment of the present application.Fig. 5 is detection module among Fig. 4 and the partial structurtes schematic diagram between the storage battery.
As shown in Figure 4 and Figure 5,1 is vehicle control system among the figure, 2 is storage battery, and more piece storage battery 2 has constituted batteries, and this storage battery control system that the embodiment of the present application provides comprises: at least one detection module 3, control module 4 and a plurality of discharge Executive Module 5.
At least one detection module 3 is connected with a joint or more piece storage battery 2, and as shown in Figure 4 and Figure 5,3 of detection modules and a joint storage battery 2 among the figure are used to detect the voltage of storage battery.In other embodiment of the application, every joint storage battery 2 only is connected with a detection module 3, and detection module 3 can with at the most three the joint storage batterys 2 be connected, by increasing detection module 3 or on detection module 3, connecting more piece storage battery 2, can be so that the extensibility of this batteries control system improves greatly, and in the embodiment of the present application, the maximum system pile structure of this storage battery control system can reach near kilovolt, makes that the range of application of this storage battery control system is bigger.
The first input end of detection module 3 is connected with the two poles of the earth of storage battery 2, is used to gather the voltage of storage battery 2.In the embodiment of the present application, detection module 3 is chosen as the LTC6802 chip, nominal voltage owing to lead acid accumulator is generally 6V or 12V in addition, and the ceiling voltage of LTC6802 chip detection is 5V, so lead acid accumulator need be carried out dividing potential drop when using LTC6802.As shown in Figure 5, between storage battery 2 and detection module 3, also be provided with bleeder circuit 6, bleeder circuit 6 comprises resistance R 1, R2, R3, R4, R5, R6 and R7, wherein, resistance R 1, R2, R3, R4 are connected between the two poles of the earth of storage battery 2 successively, and resistance R 5 one ends are connected on the tie point between resistance R 1 and the R2, and the other end is connected with the first input end of detection module 3; Resistance R 6 one ends are connected on the tie point between resistance R 2 and the R3, and the other end also is connected with the first input end of detection module 3; Resistance R 7 one ends are connected on the tie point between resistance R 3 and the R4, and the other end also is connected with the first input end of detection module 3.Through bleeder circuit 5, the voltage of storage battery 2 can be reduced to OK range and be input in the detection module 3.
As shown in Figure 5, discharge Executive Module 5 is connected with the two poles of the earth of storage battery 2, and all be connected with a discharge Executive Module 5 on every joint storage battery 2, in the embodiment of the present application, discharge Executive Module 5 comprises discharge resistance R8 and power switch pipe Q1, wherein discharge resistance R8 and power switch pipe Q1 are connected between the two poles of the earth of storage battery 2, and the control end of power switch pipe as the discharge Executive Module control end be connected with second output of detection module 3.During normal condition; power switch pipe Q1 in the discharge Executive Module 5 ends; after the discharge instruction that receives detection module 3 transmissions of discharge Executive Module 5; power switch pipe Q1 is with conducting; make the two poles of the earth and the protective resistance R8 of storage battery 2 be in series; the two poles of the earth short circuit with storage battery 2 discharges to storage battery 2.
The structural representation of a kind of control module that Fig. 6 provides for the embodiment of the present application.As shown in Figure 6, control module 4 comprises: charging and discharging state judging unit 41, voltage comparison unit 42, discharge instruction generation unit 43 and reduction drive system power instruction generation unit 44, wherein:
Charging and discharging state judging unit 41 is used to judge the charging and discharging state of the batteries that storage battery 2 is formed.In the embodiment of the present application, charging and discharging state judging unit 41 can for electric current procuratorial organ to surveying device;
Discharge instruction generation unit 43 is connected with detection module 3, is used for generating the discharge instruction, and sends to discharge performance element module 5 by detection module 3;
Reduce drive system power instruction generation unit 44 and be connected, be used for generating and reduce the drive system power instruction, and send to vehicle control system 1 with vehicle control system 1.
In this application embodiment, can adopt the CAN bus to be connected between detection module 3 and the vehicle control system 1, also can adopt serial communication interface to connect.
In another embodiment of the application, as shown in Figure 6, control module 4 can also comprise: discharge time record cell 40 and reduce charging current instruction generation unit 45, wherein, discharge time, record cell 40 was connected with discharge Executive Module 5, the time of the power switch pipe Q1 conducting of the Executive Module 5 that is used for discharging.Reduce charging current instruction generation unit 45 and be connected, be used for generation and reduce the charging current instruction, and send to vehicle control system with vehicle control system 1.The voltage of certain joint storage battery surpasses upper limit threshold in batteries like this, after perhaps the voltage phase difference of the voltage of certain joint storage battery and other storage batterys surpasses default first preset value in the batteries, the higher storage battery of voltage was discharged after a period of time, still the voltage of storage battery that can't voltage is higher is reduced to ideal range, so just generation reduces current-order, and reduces charging current by vehicle control system 1 control charger.
In another embodiment of the application, as shown in Figure 7, this batteries control system can also comprise: a plurality of temperature sensors 7, temperature sensor 7 is arranged in the batteries on every joint storage battery 2, and temperature sensor 7 is connected with second input of detection module 3, be used to gather the temperature signal on the storage battery 2, and send to detection module 3 after converting temperature signal to magnitude of voltage.At least be provided with a temperature sensor 7 on every joint storage battery 2, on a joint storage battery 2, a plurality of temperature sensors 7 can be set also in addition.
In this embodiment, as shown in Figure 8, control module 4 can also comprise: alarm command generation unit 46, and alarm command generation unit 46 is connected with vehicle control system 1.Receive the magnitude of voltage of temperature sensor 7 transmissions when detection module 3 after, this magnitude of voltage is sent to control module 4.Voltage comparison unit 42 in the control module 4 compares this magnitude of voltage and predeterminated voltage value, when this magnitude of voltage during more than or equal to the predeterminated voltage value, alarm command generation unit 46 generates alarm command, and alarm command is sent to vehicle control system 1, reports to the police.
By above technical scheme as seen, this batteries control method that the embodiment of the present application provides, at first gather the voltage of every joint storage battery in the batteries, and the voltage of every joint storage battery of being gathered is compared mutually, obtain the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage, judge the charging and discharging state of batteries then: when being in charged state, judge the size of the voltage difference and first preset value, and when voltage difference during greater than first preset value, generate the discharge instruction, the corresponding storage battery of ceiling voltage is discharged; When being in discharge condition; then judge the size of the voltage difference and second preset value; and when voltage difference during greater than second preset value; generate the instruction that reduces drive system power; and send to vehicle control system; reducing the power output of batteries, vehicle control system according to this reduce drive system power instruction with the Power Limitation of vehicle in suitable scope, storage battery is protected.
Compared with prior art, this batteries control method can detect the voltage of the every joint storage battery in the batteries, and charging and discharging state according to batteries, with ceiling voltage in the single-unit storage battery, the difference of minimum voltage and first preset value or second preset value compare, can in time understand the difference between the single-unit storage battery, and when ceiling voltage and minimum voltage surpass preset value, be when consistency is destroyed between the single-unit storage battery, by corresponding processing, as discharge or reduction drive system power etc., can avoid occurring that individual cell is overcharged or overdischarge, and then damage the problem of batteries because difference is excessive between the single-unit storage battery.
The above only is the application's a preferred implementation, makes those skilled in the art can understand or realize the application.Multiple modification to these embodiment will be conspicuous to one skilled in the art, and defined herein General Principle can realize under the situation of the spirit or scope that do not break away from the application in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (11)
1. batteries control method, described batteries comprises the more piece storage battery, it is characterized in that, comprising:
Gather the voltage of every joint storage battery in the described batteries;
The voltage of every joint storage battery of being gathered is compared mutually, obtain the voltage difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage;
Judge the charging and discharging state of described batteries;
If described batteries is in charged state, judge the size of described voltage difference and first preset value, when described voltage difference during, generate discharge and instruct more than or equal to first preset value, the corresponding storage battery of described ceiling voltage is discharged;
If described batteries when being in discharge condition, is judged the size of described voltage difference and second preset value,, generate the instruction of reduction drive system power, and send to vehicle control system when described voltage difference during more than or equal to second preset value.
2. method according to claim 1 is characterized in that, judges the charging and discharging state of described batteries according to the sense of current of described batteries.
3. method according to claim 1 is characterized in that, after the pairing storage battery of described ceiling voltage is discharged, further comprises:
Record to described ceiling voltage corresponding storage battery time of discharging;
Judge and whether equal Preset Time described discharge time;
When equal Preset Time discharge time, gather the voltage of every joint storage battery in the described batteries; And the voltage of every joint storage battery of described collection compared mutually the voltage difference of obtain discharging back ceiling voltage, minimum voltage and ceiling voltage and minimum voltage;
The relation of the judgement discharge described voltage difference in back and first preset value, when described voltage difference was more than or equal to first preset value after the discharge, generation reduced the charging current instruction, and sends to charging device.
4. method according to claim 1 is characterized in that, generation further comprises after reducing the instruction of drive system power:
Gather the voltage of every joint storage battery in the described batteries.
5. method according to claim 1 is characterized in that, further comprises:
Gather the ambient temperature signal of at least two positions in the described batteries, and convert described temperature signal to magnitude of voltage;
Described magnitude of voltage and predeterminated voltage value are compared;
When described magnitude of voltage during, generate alarm command, and described alarm command is sent to vehicle control system, and take safeguard measure by vehicle control system more than or equal to the predeterminated voltage value.
6. batteries control system, described batteries comprises the more piece storage battery, it is characterized in that, comprising: at least one detection module, a plurality of discharge Executive Module and control module, wherein:
The two poles of the earth of a joint or more piece storage battery are connected in the first input end of described at least one detection module and the described batteries, first output is connected with control module, described at least one detection module is used for gathering the voltage of the every joint storage battery of described batteries, and the voltage that collects is sent to described control module;
Every joint storage battery all is connected with a discharge Executive Module in the described batteries, the control end of described discharge Executive Module is connected with second output of the detection module that is connected with this joint storage battery, and described discharge Executive Module is used for this coupled joint storage battery is discharged;
Described control module is connected with vehicle control system, and described control module comprises: charging and discharging state judging unit, voltage comparison unit, discharge instruction generation unit and attenuating drive system power generation unit, wherein:
Described charging and discharging state judging unit is used to judge that described batteries is in charged state or discharge condition;
Described voltage comparison unit, the voltage that is used for the every joint storage battery that will gather relatively obtains the difference of ceiling voltage, minimum voltage and ceiling voltage and minimum voltage mutually, and described voltage difference is compared with first preset value or second preset value;
Described discharge instruction generation unit is used for when batteries is in charged state and described voltage difference during more than or equal to first preset value, generates discharge and instructs, and send to the described discharge Executive Module that is connected with the corresponding storage battery of described ceiling voltage;
Described attenuating drive system power generation unit is used for when batteries is in discharge condition and described voltage difference during more than or equal to second preset value, generates the instruction that reduces drive system power, and sends to vehicle control system.
7. system according to claim 6 is characterized in that, in described at least one detection module each detection module with at the most three the joint storage batterys be connected, every joint storage battery only is connected with a detection module in the described batteries.
8. system according to claim 6 is characterized in that, described discharge Executive Module comprises discharge resistance and power switch pipe, wherein:
The two poles of the earth of described discharge resistance and discharge switch and storage battery are in series, and the control end of described power switch pipe is as the control end of discharge Executive Module, and described power switch pipe receives discharge instruction back conducting.
9. system according to claim 6 is characterized in that, described control module further comprises: discharge time record cell, wherein:
Described discharge time record cell, the discharge time that is used to write down described discharge Executive Module.
10. system according to claim 6 is characterized in that, further comprises: a plurality of temperature sensors and alarm command generation unit, wherein:
Every joint storage battery is provided with at least one described temperature sensor in the described batteries, described temperature sensor is connected with second input of described detection module, be used to detect the temperature signal of described storage battery, and be input in the described detection module after converting described temperature signal to magnitude of voltage;
Described detection module sends to described voltage comparison unit with described magnitude of voltage, and when described magnitude of voltage during more than or equal to described predeterminated voltage value, described alarm command generation unit generates alarm command, and described alarm command is sent to vehicle control system.
11. system according to claim 6 is characterized in that, further comprises:
Bleeder circuit, the every joint storage battery of described batteries and with detection module that this joint storage battery is connected between, two inputs of described bleeder circuit are connected with the two poles of the earth of described storage battery, output is connected with the first input end of described detection module.
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