CN103227492B - Charging equalization control circuit of battery pack - Google Patents
Charging equalization control circuit of battery pack Download PDFInfo
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- CN103227492B CN103227492B CN201310163995.9A CN201310163995A CN103227492B CN 103227492 B CN103227492 B CN 103227492B CN 201310163995 A CN201310163995 A CN 201310163995A CN 103227492 B CN103227492 B CN 103227492B
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- 230000000052 comparative effect Effects 0.000 claims description 18
- 239000000178 monomer Substances 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 17
- 239000005955 Ferric phosphate Substances 0.000 description 7
- 229940032958 ferric phosphate Drugs 0.000 description 7
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 7
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a charging equalization control circuit of a battery pack. The battery pack comprises at least two battery monomers. The charging equalization control circuit comprises a plurality of charging circuits connected with power lines and at least two battery monomers respectively, a voltage detection circuit connected with at least two battery monomers respectively, a voltage comparator connected with the voltage detection circuit, a controller connected with the voltage comparator and the charging circuits, and a current equalization circuit connected with the charging circuits and the controller. The charging equalization control circuit sets different charging modes or charging gears for the charging circuits, controls a charging situation according to voltage among the battery monomers in the battery pack, realizes more equalization among the battery monomers, and can reduce higher charging speeds of the battery monomers, so that a purpose of equalization charging of the battery monomers in the battery pack can be achieved.
Description
Technical field
The application relates to battery pack control technology field, particularly relates to a kind of batteries charging balancing control circuit.
Background technology
Ferric phosphate lithium cell is the novel secondary power supply that new development is in recent years got up, its major advantage is that input-output power is large, operating temperature range is wide, memory-less effect, reach the extra long life environmental protection of more than 2000 times and the feature such as floating charge characteristic is outstanding, is widely used in electric automobile and energy-accumulating power station field.
But ferric phosphate lithium cell is when high power charging-discharging, actual specific capacity is low, although so ferric phosphate lithium cell has above-mentioned multiple advantages, but be applied in back-up source field, when particularly the station of transformer station is with back-up source field, advantage is not obvious, effectively can not carry out the shallow of ferric phosphate lithium cell and fill shallow putting, easily there is the situation of high magnification charge and discharge, thus effectively can not maintain physical characteristic and the chemical characteristic of ferric phosphate lithium cell.
After the object properties of a certain battery and chemical characteristic change, will difference, for a long time phenomenon that will some battery caused to occur overdischarge like this between battery in battery pack individuality.Also being the same carrying out charging process, if do not consider difference condition between battery cell and charge, single battery may being caused to occur situation about overcharging.If the long-term overdischarge of single battery or overcharge, its battery capacity will reduce, and useful life will shorten, and the consistency of whole Battery pack will be damaged, thus shortens the life-span of battery pack.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of batteries charging balancing control circuit, can equalizing charge to realize each battery cell in battery pack.
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of batteries charging balancing control circuit, described battery pack comprises at least two battery cells, and this balancing control circuit comprises:
Input is connected with power line, the output charging circuit that is connected of battery cell described with at least two respectively;
Input respectively battery cell described with at least two is connected, for gathering the voltage detecting circuit of the voltage of at least two described battery cells;
Input is connected with the output of described voltage detecting circuit, for calculating the average voltage of at least two described battery cells, and described average voltage and predetermined voltage threshold are compared obtain the first comparative result, and compared between two by the voltage of at least two described battery cells, and obtain the voltage comparator of the second comparative result;
Input is connected with described voltage comparator, output is connected with charging circuit, for controlling the charging voltage of described charging circuit and the size of charging current according to described first comparative result, and generate the controller of current-sharing signal according to described second comparative result;
Be connected with multiple described charging circuit, and be connected with described controller, for the flow equalizing circuit of the charging current according to the multiple described charging circuit of described current-sharing signal controlling.
Preferably, described voltage comparator comprises:
For described average voltage and the first predetermined voltage threshold, the second predetermined voltage threshold are compared the first voltage comparator obtaining the first comparative result;
For the voltage of at least two described battery cells being compared between two the second voltage comparator obtaining the second comparative result.
Preferably, described controller comprises:
Input is connected with the output of the first voltage comparator, the second voltage comparator, the first predetermined voltage threshold is equaled for controlling described charging voltage when described average voltage is less than described first predetermined voltage threshold, or, equal the second predetermined voltage threshold when described average voltage controls described charging voltage when being more than or equal to the first predetermined voltage threshold and be less than between the second predetermined voltage threshold; Or, the voltage control circuit that described charging voltage equals the first voltage threshold is controlled when described average voltage equals described second predetermined voltage threshold;
Input is connected with the output of the first voltage comparator, the second voltage comparator, for controlling the charging current of described charging circuit when described average voltage is less than described first predetermined voltage threshold between 0.1C ~ 0.2C, or the charging current controlling described charging circuit when described average voltage is more than or equal to described first predetermined voltage threshold is the current control circuit of 0.01C;
Be connected with described voltage comparator, for judging that the voltage of some battery cells is whether higher than the first comparator of other battery cells in described battery pack;
Be connected with described first comparator, for when the voltage of some battery cells is whether higher than in described battery pack during other battery cells, generate the first trigger of current-sharing signal.
Preferably, described first predetermined voltage threshold is 3.42V, and described second predetermined voltage threshold is 3.6V.
Preferably, comprise further: be connected with described voltage detecting circuit, for but described average voltage be less than the first predetermined voltage threshold and charging current between 0.1C ~ 0.2C time, generate the first time-delay command and send to described voltage detecting circuit, or, when described average voltage be more than or equal to the first predetermined voltage threshold and be less than the second predetermined voltage threshold and charging current at 0.01C time, generate the second time-delay command and send to described voltage detecting circuit; Or, when stating average voltage and equaling the second predetermined voltage threshold, generate the 3rd delay instruction and send to the delay controller of described voltage detecting circuit.
Preferably, the time of delay in described first delay instruction and the second delay instruction is 0 ~ 1 hour, and the time expand in described 3rd delay instruction is 0.5 ~ 24 hour.
Preferably, described flow equalizing circuit comprises multiple resistance and multiple diverter switch, wherein:
Each described charging circuit is all in series with at least one resistance, and each resistance all forms a diverter branch with a diverter switch;
The control end of each diverter switch is connected with described controller, includes switching signal in described current-sharing signal, and described diverter switch controlled by described current-sharing signal breaker in middle signal.
Preferably, described controller also comprises:
Be connected with described voltage comparator, for judging whether the voltage difference of the batteries monomer in described battery pack is less than the second comparator of predetermined threshold value;
Be connected with described second comparator, for when the voltage difference of the batteries monomer in described battery pack is less than predetermined threshold value, generates diverter switch restoring signal and send to the second trigger of described flow equalizing circuit.
By above technical scheme, visible, what the embodiment of the present application provided should based on the batteries charging balancing control circuit changing charge mode, first the voltage of all battery cells in battery pack in charging process is gathered, then the average voltage of all battery cells is calculated, and the average voltage calculated and predetermined voltage threshold are compared, according to comparing the different result obtained, change charging voltage and the charging current of charging circuit, namely be equivalent to for charging circuit sets different charge modes or charging gear, and then according to the voltage in battery pack between battery cell, charge condition can be controlled, realize between battery cell more balanced.Meanwhile, can also judge in battery pack, whether to occur charging rate battery cell faster, and generate current-sharing signal and send to flow equalizing circuit, be controlled to occur the charging current of charging rate battery cell faster by flow equalizing circuit.And then the charging rate of battery cell of this exception can be reduced, to reach the object of each batteries monomer equalizing charge in battery pack.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of a kind of batteries charging balancing control circuit that Fig. 1 provides for the embodiment of the present application;
The structural representation of the comparator that Fig. 2 provides for the embodiment of the present application;
The structural representation of the controller that Fig. 3 provides for the embodiment of the present application;
The structural representation of the another kind of batteries charging balancing control circuit that Fig. 4 provides for the embodiment of the present application;
The another kind of structural representation of the controller that Fig. 5 provides for the embodiment of the present application;
The structural representation of another batteries charging balancing control circuit that Fig. 6 provides for the embodiment of the present application.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, 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 is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Embodiment one:
The structural representation of a kind of batteries charging balancing control circuit that Fig. 1 provides for the embodiment of the present application.
This control circuit is used for controlling the charging process of battery pack, to make each battery cell in battery pack realize equalizing charge, for battery pack, comprises at least two battery cells.In Fig. 1,100 is battery pack, and 200 is battery cell, and 300 is the power line with batteries charging.
As shown in Figure 1, this control circuit comprises: comprising: charging circuit 1, voltage detecting circuit 2, voltage comparator 3, controller 4 and flow equalizing circuit 5.
The input of described charging circuit 1 is connected with power line 300, the output of described charging circuit 1 respectively battery cell 200 described with at least two is connected, the effect of charging circuit 1 is charged after the voltage step-down on power line 300, current limitation to battery cell, charging circuit 1, when specific implementation, can be step-down current-limiting circuit usually.In addition, in the embodiment of the present application, each battery cell 200 can configure a charging circuit 1 respectively.
The input of voltage detecting circuit 2 respectively battery cell 200 described with at least two is connected, and output is connected with described voltage comparator 3.The effect of voltage detecting circuit 2 is the voltage gathering at least two described battery cells 200, and the voltage collected is sent to voltage comparator 3.
Described average voltage and predetermined voltage threshold, for calculating the average voltage of at least two described battery cells 200, compare and obtain the first comparative result by voltage comparator 3, and the first comparative result is sent to described controller 4.Voltage comparator 3 also obtains the second comparative result for being compared between two by the voltage of at least two described battery cells in addition, and the second comparative result is sent to described controller 4
As shown in Figure 2, be the structural representation of the comparator that the embodiment of the present application provides, in figure, comparator 3 comprises: the first voltage comparator 31 and the second voltage comparator 32, wherein:
The output of the first voltage comparator 31 is connected with the input of voltage control circuit 43, current control circuit 44 respectively, and the first voltage comparator 31 is for comparing described average voltage and the first predetermined voltage threshold, the second predetermined voltage threshold;
Second voltage comparator 32 is for comparing the voltage of at least two described battery cells between two.
Controller 4 is connected with voltage comparator 3, and on the one hand, controller 4 according to the first comparative result, can control the charging voltage of charging circuit and the size of charging current; On the other hand, controller 4 can also according to the second comparative result, and when the charging rate of some battery cells is very fast, the voltage of this battery cell higher than other battery cells, and then will generate current-sharing signal, and current-sharing signal is sent to flow equalizing circuit 5.
As shown in Figure 3, be the structural representation of the controller that the embodiment of the present application provides, in figure, controller 4 comprises: voltage control circuit 41, current control circuit 42, first comparator 43 and the first trigger 44.
The output of comparator 3 is connected with the input of voltage control circuit 41, current control circuit 42 respectively; The output of voltage control circuit 41, current control circuit 42 is connected with charging circuit 1 respectively, and voltage control circuit 41, current control circuit 42 are for the size of the charging voltage and charging current that control charging circuit 1.
When described average voltage is less than described first predetermined voltage threshold, the charging voltage that described voltage control circuit controls described charging circuit equals the first predetermined voltage threshold, (meaning of C refers to the total capacity of storage battery here between 0.1C ~ 0.2C for described current control circuit and charging current, for the battery of 600mAh, 0.01C is 6mA);
And, when described average voltage be more than or equal to the first predetermined voltage threshold and little second predetermined voltage threshold time, the charging voltage that described voltage control circuit controls described charging circuit equals the second predetermined voltage threshold, described current control circuit and charging current is 0.01C;
In addition, when described average voltage equals the second predetermined voltage threshold, the charging voltage that described voltage control circuit controls described charging circuit equals the first predetermined voltage threshold, described current control circuit and charging current is 0.01C.
In some specific embodiments, described first predetermined voltage threshold is 3.42V, and described second predetermined voltage threshold is 3.6V.
Like this in whole charging process, in whole charging process, first adopt the cut-off current of 3.42V upper voltage limit value and 0.1C ~ 0.2C to batteries charging, namely first adopt the normal mold filling formula of the large current limliting of low pressure to charge to battery pack, quick charge can be carried out to battery pack; When after average monomer voltage to 3.42V, charging current is reduced, after charging current is reduced to 0.01C, carries out boost charge with 0.01C current versus cell, namely adopt the supplement mode of the little current limliting of high pressure to charge to battery pack; After the average voltage being supplemented to battery cell reaches 3.6V, charging voltage is reduced to 3.42V, ferric phosphate lithium cell charging voltage so just can be made when 3.42V ~ 3.6V, make cell voltage be bending upwards.So this method by changing charge mode, can first large current charge, and then low current charge, can make between battery cell better harmonious, especially to the battery long with ferric phosphate lithium cell this plateau, in the During Process of Long-term Operation of battery pack, can reduce or postpone the inconsistent problem of capacity between battery cell, improve the quality of battery pack.
First comparator 43 is connected with described voltage comparator 3, for judging that whether the voltage of some battery cells is higher than other battery cells in described battery pack; And the first trigger 44 is connected with described first comparator 43, for when whether the voltage of some battery cells is higher than in described battery pack during other battery cells, generates current-sharing signal, and current-sharing signal is sent to flow equalizing circuit 5.In the specific implementation, the first trigger 44 can be level trigger etc.
Flow equalizing circuit 5 is connected with multiple charging circuit 1, and the effect of flow equalizing circuit 5 is the charging currents according to the multiple charging circuit of current-sharing signal controlling, and then controls the charging rate of charging rate battery cell faster.In the embodiment of the present application, flow equalizing circuit 5 can be arranged separately, also can be arranged in multiple charging circuit 1.
When specific embodiment, flow equalizing circuit 5 can comprise the network of multiple resistance and multiple diverter switch, wherein, can wear in each charging circuit 1 and have at least one resistance, each resistance can form a diverter branch with a diverter switch, here current limliting is carried out in the effect of resistance, and whether the effect of diverter switch is controlling resistance be linked in charging circuit.Diverter switch can be the point control switches such as relay, the control end of diverter switch is connected with controller, in addition, in the current-sharing signal that controller generates, include switching signal, and diverter switch controls to open or close by described current-sharing signal breaker in middle signal.
In addition, foregoing description be for some charging rates faster battery cell control, in addition, when multiple battery cell all occurs abnormal, this Time Controller can generate for simultaneously to the current-sharing signal that multiple abnormal battery cell controls.
By above technical scheme, visible, what the embodiment of the present application provided should based on the batteries charging balancing control circuit changing charge mode, first the voltage of all battery cells in battery pack in charging process is gathered, then the average voltage of all battery cells is calculated, and the average voltage calculated and predetermined voltage threshold are compared, according to comparing the different result obtained, change charging voltage and the charging current of charging circuit, namely be equivalent to for charging circuit sets different charge modes or charging gear, and then according to the voltage in battery pack between battery cell, charge condition can be controlled, realize between battery cell more balanced.Meanwhile, can also judge in battery pack, whether to occur charging rate battery cell faster, and generate current-sharing signal and send to flow equalizing circuit, be controlled to occur the charging current of charging rate battery cell faster by flow equalizing circuit.And then the charging rate of battery cell of this exception can be reduced, to reach the object of each batteries monomer equalizing charge in battery pack.
Embodiment two:
Energy loss is brought in order to avoid frequently detecting batteries monomer voltage, in other embodiments of the application, can also in different mode charging process, the interval time that setting detects.
The another kind that Fig. 4 provides for the embodiment of the present application is based on the structural representation of batteries charging balancing control circuit changing charge mode.
As shown in Figure 4, this charge balancing control circuit can also comprise: delay controller 6, and delay controller 4 is connected with voltage detecting circuit 2, for the assay intervals of control voltage testing circuit.
When average voltage be less than the first predetermined voltage threshold and charging current between 0.1C ~ 0.2C time, generate the first time-delay command and send to described voltage detecting circuit, control after described voltage detecting circuit 2 postpones the first Preset Time, then detect the voltage of battery cell.
When average voltage be more than or equal to the first predetermined voltage threshold and be less than the second predetermined voltage threshold and charging current at 0.01C time, generate the second time-delay command and send to described voltage detecting circuit, control after described voltage detecting circuit 2 postpones the second Preset Time, then detect the voltage of battery cell.
In addition, when average voltage equals the second predetermined voltage threshold, generate the 3rd time-delay command, and send to described voltage detecting circuit, after controlling described voltage detecting circuit 2 delay control three Preset Time, then detect the voltage of battery cell
Be connected with described charging circuit, for but described average voltage be less than the first predetermined voltage threshold and charging current between 0.1C ~ 0.2C time, or, but described average voltage be more than or equal to the first predetermined voltage threshold and be less than the second predetermined voltage threshold and charging current when 0.01C; Or, when stating average voltage and equaling the second predetermined voltage threshold, generate the 3rd delay instruction and send to the delay controller 6 of described charging circuit.
In some specific embodiments, the time of delay in the first delay instruction and the second delay instruction is 0 ~ 1 hour, and the time expand in described 3rd delay instruction is 0.5 ~ 24 hour.
Embodiment three:
In above-described embodiment one, can to occurring that the charge condition of charging rate battery cell faster regulates, but after adjustment completes, the charge condition of this battery cell will be tending towards normal, if now still take shunting measure, will again cause the charging rate of this battery cell lower than other battery cells.
For this reason, in the embodiment of the present application, as shown in Figure 5, the controller 3 in this control circuit can also comprise: the second comparator 45 and the second trigger 46, wherein:
Second comparator 45 is connected with described voltage comparator 3, for judging whether the voltage difference of the batteries monomer in described battery pack is less than predetermined threshold value, here predetermined threshold value considers otherness between monomer and arranges, and namely allows the less difference existed between battery cell;
Second trigger 46 is connected with described second comparator 45, for when the voltage difference of the batteries monomer in described battery pack is less than predetermined threshold value, generate diverter switch restoring signal and send to described flow equalizing circuit 5, recovering with the diverter switch realizing the first trigger 44 to trigger rear change.
Embodiment four:
In order to avoid in charging process, there is situation about overcharging in single battery monomer, and then causes damage to battery cell, as shown in Figure 6, in the embodiment of the present application, this control circuit can also comprise: capacity check device 7, capacity comparator 8 and stopping charging signals generative circuit 9.
Capacity check device 7 is connected with described battery cell 200, for detecting the battery capacity of described battery cell 200, in the embodiment of the present application, capacity check device 7 can be voltage detecting circuit, namely judge whether battery cell is full of according to the voltage of battery cell, in addition, can also judge whether battery cell charges according to other parameters of battery cell.
Capacity comparator 8 is connected with described capacity check device 7, for detecting that battery capacity and preset battery capacity compare.Here capacity comparator 8 can be common level comparator, namely corresponding preset battery capacity arranges a known level signal, then the capacitance detected also is arranged to a level signal, then judge the level height of two level signals, and then can judge whether battery cell is full of.In this embodiment of the present application, capacity comparator 8 is when comparing, the total capacity of the battery pack of multiple battery cell composition can be calculated, and utilize the total capacity of this battery pack and preset battery capacity to compare, in addition, the battery capacity of any one battery cell and preset battery capacity also can be utilized to compare.
Stop signal generative circuit 8 is connected with described capacity comparator 8, and be connected with described charging circuit 1, when detecting that battery capacity equals preset battery capacity, stop signal generative circuit 8 generates and stops charging signals, and send to described charging circuit 1, control charging circuit 1 and stop charging, shown in Fig. 1, stop charging signals circuit 8 to be connected with a charging circuit 1, in actual use, charging circuit 8 is stopped to be connected with each charging circuit 1.In the embodiment of the present application, charging signals generative circuit is stopped can be level generator
In the embodiment of the present application, mains switch is provided with in charging circuit 1, and stop charging signals generative circuit 9 can be level generator, such as sawtooth waveforms or square wave maker, namely the stopping charging signals generating is level signal, the mains switch utilizing this level signal just can trigger in charging circuit 1 disconnects, and then realizes after battery cell charging complete, stops charging.In addition, in order to ensure the bending upwards of battery cell, after stopping charging signals generating, after can also a period of time being postponed, at disconnection charging circuit.
Above a kind of batteries charging balancing control circuit that the application provides is described in detail, apply specific case herein to set forth the principle of the application and execution mode, the explanation of above embodiment is just for helping method and the core concept thereof of understanding the application; Meanwhile, for one of ordinary skill in the art, according to the thought of the application, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
It should be noted that, in this article, such as " be greater than " or " exceeding " or " higher than " or " being less than " or " lower than " etc. and so on relationship description, all can be understood as " be greater than and be not equal to " or " be less than and be not equal to ", also can be understood as " being more than or equal to " or " being less than or equal to ", and not necessarily require or imply that be necessary for restriction or intrinsic a kind of situation.
In addition, in this article, the such as relational terms of " first " and " second " etc. and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
It should be noted that, the above is only a part of preferred embodiment of technical scheme, those skilled in the art are fully understood or realizes the application, instead of whole embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore; based on above embodiment; for those skilled in the art; do not departing from the application's principle, under not making creative work prerequisite, multiple apparent amendment and retouching can also made; by the every other embodiment that these amendments and retouching obtain; can be applied to technical scheme, these do not affect the realization of the application, all should belong to the protection range of the application.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a batteries charging balancing control circuit, described battery pack comprises at least two battery cells, it is characterized in that, this balancing control circuit comprises:
Input is connected with power line, the output charging circuit that is connected of battery cell described with at least two respectively;
Input respectively battery cell described with at least two is connected, for gathering the voltage detecting circuit of the voltage of at least two described battery cells;
Input is connected with the output of described voltage detecting circuit, for calculating the average voltage of at least two described battery cells, and described average voltage and predetermined voltage threshold are compared obtain the first comparative result, and the voltage of at least two described battery cells is compared between two, and obtain the voltage comparator of the second comparative result, wherein, described voltage comparator comprises:
For described average voltage and the first predetermined voltage threshold, the second predetermined voltage threshold are compared the first voltage comparator obtaining the first comparative result;
For the voltage of at least two described battery cells being compared between two the second voltage comparator obtaining the second comparative result;
Input is connected with described voltage comparator, output is connected with charging circuit, for controlling the charging voltage of described charging circuit and the size of charging current according to described first comparative result, and generate the controller of current-sharing signal according to described second comparative result, described controller comprises:
Input is connected with the output of the first voltage comparator, the output of the second voltage comparator, equals the first predetermined voltage threshold for the charging voltage controlling described charging circuit when described average voltage is less than described first predetermined voltage threshold; Or the charging voltage controlling described charging circuit when described average voltage is more than or equal to the first predetermined voltage threshold and is less than the second predetermined voltage threshold equals the second predetermined voltage threshold; Or, the voltage control circuit that described charging voltage equals the first voltage threshold is controlled when described average voltage equals described second predetermined voltage threshold;
Input is connected with the output of the first voltage comparator, the output of the second voltage comparator, for controlling the charging current of described charging circuit when described average voltage is less than described first predetermined voltage threshold between 0.1C ~ 0.2C, or the charging current controlling described charging circuit when described average voltage is more than or equal to described first predetermined voltage threshold is the current control circuit of 0.01C, wherein C refers to the total capacity of storage battery, and 0.01C is 6mA;
Be connected with described voltage comparator, for judging that the voltage of some battery cells is whether higher than the first comparator of other battery cells in described battery pack;
Be connected with described first comparator, for when the voltage of some battery cells is whether higher than in described battery pack during other battery cells, generate the first trigger of current-sharing signal;
Be connected with multiple described charging circuit, and be connected with described controller, for the flow equalizing circuit of the charging current according to the multiple described charging circuit of described current-sharing signal controlling.
2. balancing control circuit according to claim 1, is characterized in that, described first predetermined voltage threshold is 3.42V, and described second predetermined voltage threshold is 3.6V.
3. balancing control circuit according to claim 2, it is characterized in that, comprise further: be connected with described voltage detecting circuit, for be less than the first predetermined voltage threshold when described average voltage and charging current at 0.1C ~ 0.2C time, generate the first time-delay command and send to described voltage detecting circuit, or, when described average voltage be more than or equal to the first predetermined voltage threshold and be less than the second predetermined voltage threshold and charging current at 0.01C time, generate the second time-delay command and send to described voltage detecting circuit; Or, when described average voltage equals the second predetermined voltage threshold, generate the 3rd delay instruction and send to the delay controller of described voltage detecting circuit.
4. balancing control circuit according to claim 3, is characterized in that, the time of delay in described first delay instruction and the second delay instruction is 0 ~ 1 hour, and the time expand in described 3rd delay instruction is 0.5 ~ 24 hour.
5. control circuit according to claim 1, is characterized in that, described flow equalizing circuit comprises multiple resistance and multiple diverter switch, wherein:
Each described charging circuit is all in series with at least one resistance, and each resistance all forms a diverter branch with a diverter switch;
The control end of each diverter switch is connected with described controller, includes switching signal in described current-sharing signal, and described diverter switch controlled by described current-sharing signal breaker in middle signal.
6. control circuit according to claim 1, is characterized in that, described controller also comprises:
Be connected with described voltage comparator, for judging whether the voltage difference of the battery cell in described battery pack is less than the second comparator of predetermined voltage threshold;
Be connected with described second comparator, for when the voltage difference of the battery cell in described battery pack is less than predetermined voltage threshold, generates diverter switch restoring signal and send to the second trigger of described flow equalizing circuit.
7. control circuit according to claim 6, is characterized in that, comprises further:
Be connected with described battery cell, for detecting the capacity check device of described battery cell battery capacity;
Be connected with described capacity check device, for will the capacity comparator that battery capacity and preset battery capacity compare be detected;
Be connected with described capacity comparator, and be connected with described charging circuit, stop charging signals for generating when detecting that battery capacity equals preset battery capacity, and send to the stopping charging signals generative circuit of described charging circuit.
8. control circuit according to claim 7, is characterized in that, described stopping charging signals generative circuit is level generator.
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| TWI379486B (en) * | 2009-02-17 | 2012-12-11 | Green Solution Tech Co Ltd | The battery charging controlling apparatus and battery balance charging controller |
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| CN101404347A (en) * | 2008-10-24 | 2009-04-08 | 中国移动通信集团甘肃有限公司 | Accumulator charging management method and apparatus |
| CN101752882B (en) * | 2008-11-28 | 2013-04-10 | 比亚迪股份有限公司 | Equalizer and equalizing charging method |
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| CN202888895U (en) * | 2012-10-17 | 2013-04-17 | 北京川江源科技有限公司 | Battery pack balancing device and battery pack management system comprising the same |
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| CN103227492A (en) | 2013-07-31 |
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