CN105896627B - A kind of system and its intelligent control method based on battery pack via Self-reconfiguration - Google Patents

A kind of system and its intelligent control method based on battery pack via Self-reconfiguration Download PDF

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Publication number
CN105896627B
CN105896627B CN201410654747.9A CN201410654747A CN105896627B CN 105896627 B CN105896627 B CN 105896627B CN 201410654747 A CN201410654747 A CN 201410654747A CN 105896627 B CN105896627 B CN 105896627B
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China
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switch
battery
battery pack
connect
cell array
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CN201410654747.9A
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Chinese (zh)
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CN105896627A (en
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董云卫
孙朋朋
葛永琪
张健
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西北工业大学
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Abstract

The present invention relates to a kind of system and its intelligent control method based on battery pack via Self-reconfiguration, system features are that system includes cell array, control section and output importation;Its via Self-reconfiguration control method is characterized in that during entire battery set charge/discharge there is the process for being cut into the process of " temporarily excision battery pack set " from " main road battery pack set ", being cut into " fail battery group set " from " main road battery pack set ", be cut into process, " balanced mode " process of " main road battery pack set " from " temporarily excision battery pack set ";Then according to corresponding switching condition, dynamically battery is switched between " main road battery pack set ", " temporarily excision battery pack set ", " fail battery group set ".Beneficial effects of the present invention are as follows: solving the problems, such as the grade that is unbalanced, being capable of flexible configuration output or input voltage of battery set charge/discharge, can be configured with flexible battery pack and carry out charge and discharge, can be improved the service life of battery pack.

Description

A kind of system and its intelligent control method based on battery pack via Self-reconfiguration

Technical field

The invention belongs to technical field of battery management, more particularly, to a kind of system and its intelligence based on battery pack via Self-reconfiguration It can control method.

Background technique

In the mobile devices such as electric car, lunar rover, main source of supply of the battery as its energy is needed, but due to The end voltage of single battery is lower, needs that single battery is connected in series, and the voltage that can be only achieved electrical equipment in this way is wanted It asks.

Battery pack is this there is the unbalanced phenomenon that single battery end voltage is irregular in charge and discharge process Phenomenon the result is that greatly reducing the capacity usage ratio of system.Currently, solve there are mainly two types of the unbalanced modes of battery pack, One is the passive solutions that electric voltage equalization is carried out using parallel resistance, capacitor;In this scheme, due to resistance heating and device Dispersibility, connection type the problem of fixing, not can solve unbalanced, heating accident;One is using in battery pack The active solution that the high single battery of voltage is powered to the low single battery of voltage;In this scheme, since connection type is solid The problem of determining, not can solve the failures such as fever.

In the mode of current solution series-connected cell group charge and discharge, although overcoming the problems, such as that connection type is fixed, In series-connected cell group, the unbalanced problem in charge and discharge process is still had.

Summary of the invention

It is an object of the invention to propose a kind of system and its intelligent control method based on battery pack via Self-reconfiguration, it both may be used To solve the problems, such as that battery pack is unbalanced, while charge and discharge system can be flexibly configured again and cuts off the battery pack of failure, mention The service life of high battery pack.

The invention is realized by the following technical scheme:

A kind of system based on battery pack via Self-reconfiguration, it is characterised in that including cell array, control section and output input unit Point;

The cell array includes battery pack, balanced unit;The battery pack includes single battery unit set, switch Sn (n=1,2...N: the number of cell array);The single battery is ferric phosphate lithium cell;The battery unit includes monomer Battery and switch Kn (n=1,2...N: the number of cell array);The single battery and switch Kn is connected in series;Described opens S is closed to connect with battery units in parallel;The balanced unit includes DC module 1, diode Dn (n=1,2...2N;N: cell array Number) and switch Cn (n=1,2...2N;N: the number of cell array);Anode and two poles of 1 output end of DC module Pipe D2n+1 (n=0,1,2...N-1;N: the number of cell array) anode connection;The diode D2n+1 (n=0,1, 2...N-1;N: the number of cell array) cathode and switch C2n+1 (n=0,1,2...N-1;N: the number of cell array) one end It is connected in series;Switch C2n+1 (n=0,1, the 2...N-1;N: the number of cell array) other end and the battery unit Anode connection;The cathode and diode D2n (n=1,2...N-1 of 1 output end of DC module;N: the number of cell array) Cathode connection;Described diode D2n (n=1, the 2...N;N: the number of cell array) anode with switch C2n (n=1, 2...N;N: the number of cell array) one end be connected in series;Described switch C2n (n=1, the 2...N;N: the number of cell array) The other end is connect with the cathode of the battery unit;The switch Kn, switch Sn, switch Cn are MOSFET;The switch Control terminal by driving be connected with the I/O pin of controller;The switch Kn, switch Sn are mutual exclusions;The switch C2n, it opens Closing C2n+1 is linkage.

The control section includes controller, touch screen;The temperature sensor is placed on every section monomer in the cell array The surface of battery;The controller detects the surface temperature of every section single battery in the cell array by temperature sensor;Institute Voltage sensor is stated to connect with the battery units in parallel in the cell array;The controller passes through described in voltage sensor detection The end voltage of every section single battery in cell array;The anode of the current sensor and the output end of cell array is connected in series;Institute State the electric current that controller detects the cell array by current sensor;The touch screen is connected with the controller;The control Device processed also detects the output end voltage of output importation by voltage sensor.

The output importation includes the DC-DC module 2 of wide-voltage range, reversing switch;The output input unit Just extremely Vin (+), the cathode of the input terminal divided are Vin (-), and just extremely Vout (+), the cathode of output end are Vout (-);Institute Just extremely Vi (+), the cathode of the input terminal of the DC-DC module 2 for the wide-voltage range stated are Vi (-);The wide-voltage range The just extremely Vo (+) of output end, the cathode of DC-DC module 2 be Vo (-);The Vin (+) of the output importation passes through The current sensor is connect with the anode of the cell array;The Vin (-) and the battery of the output importation The cathode connection of battle array;The reversing switch includes JM_i, JM_i ' (i=1,2,3,4);One end of the switch JM_4 with Vin (+) connection, the other end are connect with Vi (+);One end of the switch JM_2 is connect with Vout (+), the other end and Vi (+) Connection;One end of the switch JM_3 is connect with Vin (+), and the other end is connect with Vo (+);Described one end switch JM_1 with Vout (+) connection, the other end are connect with Vo (+);One end of the switch JM_4 ' is connect with Vin (-), the other end and Vi (-) Connection;One end of the switch JM_3 ' is connect with Vout (-), and the other end is connect with Vi (-);The one of the switch JM_2 ' End is connect with Vin (-), and the other end is connect with Vo (-);Described one end switch JM_1 ' is connect with Vout (-), the other end and Vo (-) connection;Described switch JM_i, JM_i ' (i=1,2,3,4) is MOSFET;Described switch JM_i, the JM_i ' is that linkage is opened It closes.

A kind of intelligent control method based on battery pack via Self-reconfiguration, it is characterised in that:

Entire battery pack is divided into " main road battery pack set ", " temporarily excision battery pack set ", " fail battery group collection It closes ";Wherein, " main road battery pack set " --- the battery pack worked normally in-cell array;" temporarily excision battery pack collection Close " --- the battery pack that-cell array is temporarily cut off is cut when appropriate again in " main road battery pack set ";" fail battery group Set " --- the battery pack permanently cut off in-cell array, the personnel that need repairing timely replace.In the charge and discharge process of battery pack In, there are four subprocess, by taking discharge process as an example:

1) process of " temporarily excision battery pack set " is cut into from " main road battery pack set ": previously according to single battery Flash-over characteristic, a voltage decreasing rate threshold values V is setThreshold values;According to the end electricity of certain time interval T detection single battery Pressure, then calculates the voltage decreasing rate of each single battery according to the following equation: Work as Vn_down> VThreshold valuesWhen, this section single battery is resected to " temporarily excision battery pack set " from " main road battery pack set " In.

2) process of " fail battery group set " is cut into from " main road battery pack set ": when in " main road battery pack set " Total voltage when being less than the minimum voltage of DC module and requiring, all batteries in " temporarily cut off battery pack set " are cut into In " main road battery pack set ".

3) process of " main road battery pack set " is cut into from " temporarily excision battery pack set ": when " main road battery pack collection When the minimum voltage that total voltage in conjunction " is less than DC module requires, all batteries in " temporarily excision battery pack set " are cut Enter in " main road battery pack set ".

4) " balanced mode " process: a kind of mode, which is used, gives end electricity by " main road battery pack set " the high battery of middle-end voltage Force down battery power supply, in the process, the end voltage of every batteries in dynamic monitoring " main road battery pack set ", then according to It holds voltage by low high serial number, makes highest number to minimum number power supply, secondary high number the rest may be inferred to time low number power supply etc.;Separately A kind of mode uses the battery low to end voltage by external (can be the output voltage of " main road battery pack set " through DC module) Power supply, in the process, the end voltage of every batteries, then calculates its average value in dynamic monitoring " main road battery pack set ", Sub-average battery is powered.

A kind of intelligent control method based on battery pack via Self-reconfiguration dynamically exists battery according to above-mentioned various conditions It is switched between " main road battery pack set ", " temporarily excision battery pack set ", " fail battery group set ", via Self-reconfiguration side The step of method, is as follows:

Step 1: " temporarily excision battery pack set " is resected to from " main road battery pack set " it is first determined whether meeting Condition, if it is satisfied, by single battery from being resected in " main road battery pack set " in " temporarily excision battery pack set ".

Step 2: judge whether to meet the condition for being resected to " fail battery group set " from " main road battery pack set ", if Meet, single battery is resected in " fail battery group set " from " main road battery pack set ".

Step 3: judge whether to meet from " temporarily excision battery pack set " incision " main road battery pack set " condition, if Meet, all batteries in " temporarily excision battery pack set " are all cut into " main road battery pack set ".

Step 4: judging whether to meet " balanced mode " condition, the electricity if meeting condition, in " main road battery pack set " Pond enters " balanced mode " process.

Step 5: in entire discharge process, the above process constantly repeats steps 1 and 2,3,4,5, until electric discharge terminates.

The present invention has the advantages that

1) the unbalanced of battery set charge/discharge is solved the problems, such as;

2) can flexible configuration output or input voltage grade;

3) it can be configured with flexible battery pack and carry out charge and discharge;

4) it can be improved the service life of battery pack;

Detailed description of the invention

Fig. 1 is the system block diagram of the embodiment of the present invention.

Fig. 2 is the discharge process flow chart of the embodiment of the present invention.

Fig. 3 is " balanced mode " process flow diagram flow chart in the embodiment of the present invention.

Specific embodiment

The present invention will be further described with example with reference to the accompanying drawing, and protection scope of the present invention is not limited to following institute It states.

Embodiment:

Fig. 1 is the system block diagram of the embodiment of the present invention;It includes " cell array ", " control section ", " input/out parts Point ";The function that it is realized are as follows:

1) voltage of real-time monitoring battery pack, temperature, electric current;

It 2) can be with a few batteries of biodynamic ablation/addition;

3) it can dynamically be charged to certain batteries by " DC module 1 ";

4) guarantee that whole system can charge but also discharge;

In the following, being directed to above-mentioned function, it is presented below:

Voltage, temperature sensor are connected in cell array at each endpoint, connects current sensor in the output end of cell array (Hall sensor), the controller of " control section " passes through the numerical value for acquiring these sensors, to realize real-time monitoring battery The voltage of group, temperature, electric current.In Fig. 1 " control section ", solid line "-" represents the connecting line of voltage sensor;Dotted arrow " --- → " represents the connecting line of temperature sensor;Dotted ellipseRepresent the line (Hall sensor) of current sensor.

When battery pack works normally, K1---KN is closure, and switch S1---SN, C1---C2N is to disconnect accordingly; When breaking down or dynamically cutting off battery, for example, wanting to cut off battery 2, it is only necessary to give switch K2, S2 by controller Control signal is sent, switch K2, closure switch S2 are disconnected, it is other similar therewith;When want by certain batteries cut battery Group when, for example, by battery 3 cut battery pack, only need to by controller to switch K3, S3 send control signal, closure switch K3, Switch S3 is disconnected, it is other similar therewith;By the above-mentioned means, to realize a few batteries of biodynamic ablation/addition.

If " DC module 1 " is powered to corresponding battery n, switch C2n-1, C2n are closed at;If stopped Power supply, then simultaneously switch off switch C2n-1, C2n;It can dynamically be carried out to certain batteries to realize by " DC module 1 " Charging.The short-circuit normal work for guaranteeing supply access again simultaneously between route in order to prevent, in switch Cx, (x represents the volume of switch Number, from 1 to 2N) access on joined the diode of positive connection.

In order to guarantee that whole system can charge but also discharge, the integrated connection figure of " wide input voltage DC module 2 " is such as Shown in " input/output part ";When system enters charge mode, switch JM_2, JM_2 ', JM_3, JM_3 ' closure, switch JM_1, JM_1 ', JM_4, JM_4 ' are disconnected;When system enters discharge mode, switch JM_1, JM_1 ', JM_4, JM_4 ' closure, Switch JM_2, JM_2 ', JM_3, JM_3 ' are disconnected.

" No. 1 switch " in Fig. 1 represents the tool of Sn, Kn (n=1,2...N: the number of cell array) switch inside cell array Body hardware realization, it is p-type switching tube that switch Kn, which is N type switch tube, Sn, its working principle is that: when giving " driving plate control pin " When writing 1, then Kn is turned on the switch, disconnects switch Sn;When writing 0, then Sn is turned on the switch, disconnects switch Kn;" No. 2 switches " represents battery The particular hardware of internal C2n, C2n-1 switch of battle array is realized, is C2n-1, C2n, N type switch tube, its working principle is that: it " is driven when giving Movable plate controls pin " when writing 1, then closure switch C2n, C2n+1;When writing 0, then C2n, C2n+1 are turned on the switch;" No. 3 switches " generation The particular hardware of table JM_i, JM_i ' (i=1,2,3,4) switch realizes that it is similar with " No. 2 switches ".

Based on above-mentioned hardware design, a kind of control method of via Self-reconfiguration is realized on the controller;For the ease of narration electric discharge Entire discharge flow path is split into Fig. 2, Fig. 3 two parts by process;Wherein, Fig. 2 is the discharge process process of the embodiment of the present invention Figure;Fig. 3 is " balanced mode " process flow diagram flow chart in the embodiment of the present invention.Fig. 2, Fig. 3 are described below below:

1) the discharge process flow chart of whole system is as shown in Figure 2, wherein the meaning that each label indicates is as follows:

The voltage rate of descent of battery terminal voltage in " 1. Vdown " representative " main road battery pack set ", value is according to formula (1) It is calculated.

2. " V threshold values " represents the end voltage rate of descent threshold values set according to the flash-over characteristic of single battery.

The temperature of battery in " 3. BT " representative " main road battery pack set ".

The temperature upper limit set in " 4. B threshold values " representative " main road battery pack set ".

The battery total voltage in " 5. Vleft " representative " main road battery pack set ".

6. " Vdc_min " represents in Fig. 1 the input voltage range lower limit value of " input/output part " DC module.

The number of battery in " 7. N temporarily cuts off battery pack set " representative " temporarily excision battery pack set ".

The course of work are as follows: closure switch JM_1, JM_1 first ', JM_4, JM_4 ' disconnects JM_2, JM_2 ', JM_3, JM_ 3 ' switches, into discharge mode;When discharge mode starts, battery all in battery pack is put into " main road battery pack collection Close " in, then carry out following steps:

A) reduction of speed under the voltage of every batteries is dynamically scanned in " main road battery pack set " every certain time interval Whether rate is greater than preset fall off rate threshold values, and if it is true, this batteries is resected to by " main road battery pack set " In " temporarily excision battery pack set ";Deng all batteries in " main road battery pack set " it is scanned after, enter step b).

Whether the temperature for b) dynamically scanning every batteries in " main road battery pack set " every certain time interval is big In predetermined temperature upper limit value, if it is true, this batteries is resected to " fail battery group by " main road battery pack set " In set ";Deng all batteries in " main road battery pack set " it is scanned after, enter step c).

C) judge whether the total voltage of the battery in " main road battery pack set " is less than the lower limit value of DC module input voltage, If it is true, there is battery to be cut into " main road battery pack " set more in " temporarily excision battery pack set ";Subsequently into In step d).

D) judge whether the total voltage of the battery in " main road battery pack set " is less than the lower limit value of DC module input voltage, Whether the number of battery cells in " temporarily excision battery pack set " is zero simultaneously, if it is true, enters " balanced mode " process;It is no Then repeat step a), b), c), d).

2) " balanced mode " process flow diagram flow chart is as shown in Figure 3, wherein the meaning that each label indicates is as follows:

The average voltage of battery in " 1. Vmean " representative " main road battery pack set ".

The quantity of battery in " 2. N1 " representative " main road battery pack set ".

" 3. i "=variable is represented, for storing the number of circulation.

4. " VB_i " represents the i-th batteries end voltage of discharge battery group.

5. " V over-discharge " represents in discharge process to the over-discharge voltage of every batteries setting.

The course of work are as follows: when electric discharge starts, variable i is set to 1 first;Then it carries out in accordance with the following steps:

A) judge whether the end voltage VB_i of the i-th batteries is less than the battery Cross prevention voltage V over-discharge of setting, if small In the directly excision from " main road battery pack set " by this battery;Subsequently into step b).

B) judge whether the total voltage Vleft in " main road battery pack set " is less than the lower limit value of DC module input voltage Vdc_min, if it is lower, directly terminating discharge process;Otherwise it enters step c).

C) according to formulaCalculate the average voltage Vmean in " main road battery pack set ";Then Whether the battery terminal voltage VB_i in judgement " main road battery pack set " is less than Vmean, if it is true, closure switch C2i, C2i+1, and variable i is made to increase by 1;If it is vacation, switch C2i, C2i+1 are disconnected, and variable i is made to increase by 1.

D) judge whether i is equal to N1, if if true, variable i is set to 1;Subsequently into step e).

E) step a), b), c), d) is repeated.

Claims (1)

1. a kind of system based on battery pack via Self-reconfiguration, it is characterised in that: including cell array, control section and output input unit Point;
The cell array includes battery pack, balanced unit;The battery pack include single battery unit, switch Sn, n=1, 2...N;N: the number of single battery in cell array;
The single battery unit includes single battery and switch Kn, n=1,2...N-1;N: single battery in cell array Number;
The single battery and switch Kn is connected in series;
The switch Sn is connected in parallel with single battery unit;
The balanced unit includes DC module 1, diode Dn, n=1,2...2N;N: the number of single battery in cell array; And switch Cn, n=1,2...2N;N: the number of single battery in cell array;
The anode of 1 output end of DC module is connect with the anode of diode D2n+1, n=0,1,2...N-1;N: cell array The number of middle single battery;
The cathode of the diode D2n+1 and one end of switch C2n+1 are connected in series, n=0,1,2...N-1;N: cell array The number of middle single battery;
The switch C2n+1 other end is connect with the anode of the single battery unit, n=0,1,2...N-1;N: battery The number of single battery in battle array;
The cathode of 1 output end of DC module is connect with the cathode of diode D2n, n=1,2...N;N: monomer in cell array The number of battery;
The anode of the diode D2n is connected in series with one end of switch C2n, n=1,2...N;N: monomer electricity in cell array The number in pond;
The switch C2n other end is connect with the cathode of the single battery, n=1,2...N;N: monomer electricity in cell array The number in pond;
The switch C2n, switch C2n+1 are linkages;
The output importation includes the DC-DC module 2 of wide-voltage range, reversing switch;
Just extremely Vin (+), the cathode of the input terminal of the output importation are Vin (-), the just extremely Vout of output end (+), cathode are Vout (-);
Just extremely Vi (+), the cathode of the input terminal of the DC-DC module 2 of the wide-voltage range are Vi (-);
Just extremely Vo (+), the cathode of the output end of the DC-DC module 2 of the wide-voltage range are Vo (-);
The Vin (+) of the output importation is connect by current sensor with the anode of the cell array;
The Vin (-) of the output importation is connect with the cathode of the cell array;
The reversing switch includes JM_i, JM_i ', wherein i=1,2,3,4;
One end of the switch JM_4 is connect with Vin (+), and the other end is connect with Vi (+);
One end of the switch JM_2 is connect with Vout (+), and the other end is connect with Vi (+);
One end of the switch JM_3 is connect with Vin (+), and the other end is connect with Vo (+);
Described one end switch JM_1 is connect with Vout (+), and the other end is connect with Vo (+);
One end of the switch JM_4 ' is connect with Vin (-), and the other end is connect with Vi (-);
One end of the switch JM_3 ' is connect with Vout (-), and the other end is connect with Vi (-);
One end of the switch JM_2 ' is connect with Vin (-), and the other end is connect with Vo (-);
Described one end switch JM_1 ' is connect with Vout (-), and the other end is connect with Vo (-);
Described switch JM_i, the JM_i ' is MOSFET;
Described switch JM_i, the JM_i ' is linked switch;When system enters charge mode, switch JM_2, JM_2 ', JM_3, JM_3 ' closure, switch JM_1, JM_1 ', JM_4, JM_4 ' disconnection;When system enters discharge mode, switch JM_1, JM_1 ', JM_4, JM_4 ' closure, switch JM_2, JM_2 ', JM_3, JM_3 ' disconnection;
The switch Kn, switch Sn, switch Cn are MOSFET;
The switch Kn, switch Sn are mutual exclusions.
CN201410654747.9A 2014-11-05 2014-11-05 A kind of system and its intelligent control method based on battery pack via Self-reconfiguration CN105896627B (en)

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