CN103812192A - Power battery pack managing circuit with active equalization function - Google Patents
Power battery pack managing circuit with active equalization function Download PDFInfo
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- CN103812192A CN103812192A CN201410057200.0A CN201410057200A CN103812192A CN 103812192 A CN103812192 A CN 103812192A CN 201410057200 A CN201410057200 A CN 201410057200A CN 103812192 A CN103812192 A CN 103812192A
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Abstract
The invention belongs to the technical field of battery charge and discharge and particularly relates to a power battery pack managing circuit with an active equalization function. The power battery pack managing circuit comprises a voltage acquisition module, a battery monomer selection circuit, a voltage equalization circuit, a storage battery and a power battery pack. The power battery pack managing circuit serves as a part of a vehicle-mounted power battery pack batter managing system and as an improvement of an existing charge-discharge equalization method. Compared with power battery pack managing circuits in the prior art, the power battery pack managing circuit with the active equalization function has the advantages that the equalization circuit and the equalization process are simple and reliable, and easy to control; when the power battery pack is equalized, the electric energy of the power battery pack is not consumed basically; the active equalization process is rapid and efficient, the battery charge-discharge state can be effectively managed, and thereby, the service life of the battery can be prolonged.
Description
Technical field
The invention belongs to battery charging and discharging technical field, be specifically related to a kind of power battery group management circuit with active equalization function.
Background technology
Modern electric automobile adopts tandem power battery pack more, and lithium-ion-power cell will use in a large number within following a period of time.Safety, the effective use of electrokinetic cell have great importance for the normal operation of electric automobile.
In use, owing to having inconsistency between each cell, the difference that continuous charge and discharge cycles causes, accelerates decay by the capacity that makes some cell to battery pack.Due to reasons such as the techniques in manufacturing process, even with batch, the battery of same model, also there is the difference of the aspect such as capacity, internal resistance, and in long-term use procedure, this species diversity can be increasing, and then unbalanced while causing power battery pack to discharge and recharge.Lack of uniformity is very large to the performance impact of series battery, will reduce the whole volume of battery pack, reduction of service life.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how a kind of power battery group management circuit with active equalization function is provided.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of power battery group management circuit with active equalization function, described power battery group management circuit comprises: voltage acquisition module 1, battery cell are selected circuit 2, voltage balance circuit 3, storage battery 4 and power battery pack 22;
Described voltage acquisition module 1 is connected with each battery cell in power battery pack 22, for the voltage of Real-time Collection power battery pack 22 each battery cells, and the voltage data collecting is sent to the control unit of external cell management system; Described battery cell selects circuit 2 for selecting the battery cell of the power battery pack 22 that will carry out electric voltage equalization; Described voltage balance circuit 3 and storage battery 4 are for selecting the battery cell of the selected power battery pack 22 of circuit 2 to carry out voltage balance management to battery cell.
Wherein, described battery cell selects circuit 2 to comprise: multiple relays 23 and multiple reversing switch 9; Described power battery pack 22 is composed in series by multiple battery cells;
Mutually between every two battery cells of series connection, all connect a relay 23, each relay 23 is connected with a reversing switch 9, described relay 23 and reversing switch 9 are all by the control unit control of external cell management system, the control unit of external cell management system is by controlling the break-make of corresponding relay 23, respectively corresponding reversing switch 9 incoming ends are connected to different battery cells, thereby select the battery cell that will carry out electric voltage equalization.
Wherein, described voltage balance circuit 3 comprises two the first voltage stabilizing circuit 5 and second voltage stabilizing circuits 6 of symmetry mutually;
Described the first voltage stabilizing circuit 5 comprises: the first electric capacity 10, the first metal-oxide-semiconductor 11, the first fly-wheel diode 12, the first resistance 13, the second electric capacity 14 and the first diode 15;
Described the second voltage stabilizing circuit 6 comprises: the 3rd electric capacity 16, the second metal-oxide-semiconductor 17, the second fly-wheel diode 18, the second resistance 19, the 4th electric capacity 20 and the second diode 21;
Described voltage balance circuit 3 connecting single batteries select the two ends of circuit 2 outputs as the first voltage stabilizing circuit 5 inputs, the parallel circuits being formed by described the first metal-oxide-semiconductor 11 and the first diode 15 in sequential series, described the first fly-wheel diode 12 and the parallel circuits that formed by described the first resistance 13 and the second electric capacity 14 between described the first voltage stabilizing circuit 5 input two ends, and described the first electric capacity 10 that is also connected in parallel between described the first voltage stabilizing circuit 5 input two ends; Between described the first fly-wheel diode 12 and the first diode 15, be provided with the first fulcrum, the output of described the first fulcrum and reversing switch 9 is connected and between end, is connected with the primary return of transformer 7, as the output of the first voltage stabilizing circuit 5;
The both positive and negative polarity of described storage battery 4 is as the input of the second voltage stabilizing circuit 6, the both positive and negative polarity of storage battery 4, the i.e. parallel circuits being formed by described the second metal-oxide-semiconductor 17 and the second diode 21 in sequential series, described the second fly-wheel diode 18 and the parallel circuits that formed by described the second resistance 19 and the 4th electric capacity 20 between the input two ends of the second voltage stabilizing circuit 6, and the both positive and negative polarity of storage battery 4, i.e. described the 3rd electric capacity 16 that is also connected in parallel between the input two ends of the second voltage stabilizing circuit 6; In the circuit that the second fly-wheel diode 18 is connected with the second diode 21, be provided with the second fulcrum, between described the second fulcrum and the positive pole of storage battery 4, be also connected in parallel to the secondary loop of transformer 7, as the output of the second voltage stabilizing circuit 6.
Wherein, described storage battery 4 is chargeable battery.
(3) beneficial effect
Technical solution of the present invention provides a kind of power battery group management circuit with active equalization function, as a part for vehicle mounted dynamic battery Battery pack management system, is that the one of existing cell Equalization Methods for Charge is improved; Compared with prior art, this scheme possesses following beneficial effect: this equalizing circuit and balancing procedure are simple and reliable, is easy to control; When this scheme is carried out equilibrium to power battery pack, consumption of power battery pack electric energy not substantially; And this scheme active equalization process fast, efficiently, can effectively be managed battery charging and discharging state, and then extending battery life.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention has the electrokinetic cell management circuit of active equalization function.
Fig. 2 is the equivalent circuit diagram of technical solution of the present invention when battery cell is charged.
Equivalent circuit diagram when Fig. 3 is the electric discharge of technical solution of the present invention control battery cell.
[description of reference numerals]
1-voltage acquisition module; 2-battery cell is selected circuit; 3-voltage balance circuit;
4-storage battery; 5-the first voltage stabilizing circuit; 6-the second voltage stabilizing circuit; 7-transformer;
8-cell; 9-reversing switch; 10-the first electric capacity; 11-the first metal-oxide-semiconductor;
12-the first fly-wheel diode; 13-the first resistance; 14-the second electric capacity;
15-the first diode; 16-the 3rd electric capacity; 17-the second metal-oxide-semiconductor;
18-the second fly-wheel diode; 19-the second resistance; 20-the 4th electric capacity;
21-the second diode; 22-power battery pack; 23-relay.
Embodiment
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
For solving the problem of prior art, the invention provides a kind of power battery group management circuit with active equalization function, as shown in Figure 1, described power battery group management circuit comprises: voltage acquisition module 1, battery cell are selected circuit 2, voltage balance circuit 3, storage battery 4 and power battery pack 22;
Described voltage acquisition module 1 is connected with each battery cell in power battery pack 22, for the voltage of Real-time Collection power battery pack 22 each battery cells, and the voltage data collecting is sent to the control unit of external cell management system; Described battery cell selects circuit 2 for selecting the battery cell of the power battery pack 22 that will carry out electric voltage equalization; Described voltage balance circuit 3 and storage battery 4 are for selecting the battery cell of the selected power battery pack 22 of circuit 2 to carry out voltage balance management to battery cell.
Wherein, described battery cell selects circuit 2 to comprise: multiple relays 23 and multiple reversing switch 9; Described power battery pack 22 is composed in series by multiple battery cells;
Mutually between every two battery cells of series connection, all connect a relay 23, each relay 23 is connected with a reversing switch 9, described relay 23 and reversing switch 9 are all by the control unit control of external cell management system, the control unit of external cell management system is by controlling the break-make of corresponding relay 23, respectively corresponding reversing switch 9 incoming ends are connected to different battery cells, thereby select the battery cell that will carry out electric voltage equalization.
Wherein, described voltage balance circuit 3 comprises two the first voltage stabilizing circuit 5 and second voltage stabilizing circuits 6 of symmetry mutually;
Described the first voltage stabilizing circuit 5 comprises: the first electric capacity 10, the first metal-oxide-semiconductor 11, the first fly-wheel diode 12, the first resistance 13, the second electric capacity 14 and the first diode 15;
Described the second voltage stabilizing circuit 6 comprises: the 3rd electric capacity 16, the second metal-oxide-semiconductor 17, the second fly-wheel diode 18, the second resistance 19, the 4th electric capacity 20 and the second diode 21;
Described voltage balance circuit 3 connecting single batteries select the two ends of circuit 2 outputs as the first voltage stabilizing circuit 5 inputs, the parallel circuits being formed by described the first metal-oxide-semiconductor 11 and the first diode 15 in sequential series, described the first fly-wheel diode 12 and the parallel circuits that formed by described the first resistance 13 and the second electric capacity 14 between described the first voltage stabilizing circuit 5 input two ends, and described the first electric capacity 10 that is also connected in parallel between described the first voltage stabilizing circuit 5 input two ends; Between described the first fly-wheel diode 12 and the first diode 15, be provided with the first fulcrum, the output of described the first fulcrum and reversing switch 9 is connected and between end, is connected with the primary return of transformer 7, as the output of the first voltage stabilizing circuit 5;
The both positive and negative polarity of described storage battery 4 is as the input of the second voltage stabilizing circuit 6, the both positive and negative polarity of storage battery 4, the i.e. parallel circuits being formed by described the second metal-oxide-semiconductor 17 and the second diode 21 in sequential series, described the second fly-wheel diode 18 and the parallel circuits that formed by described the second resistance 19 and the 4th electric capacity 20 between the input two ends of the second voltage stabilizing circuit 6, and the both positive and negative polarity of storage battery 4, i.e. described the 3rd electric capacity 16 that is also connected in parallel between the input two ends of the second voltage stabilizing circuit 6; In the circuit that the second fly-wheel diode 18 is connected with the second diode 21, be provided with the second fulcrum, between described the second fulcrum and the positive pole of storage battery 4, be also connected in parallel to the secondary loop of transformer 7, as the output of the second voltage stabilizing circuit 6; When the described power battery group management circuit application with active equalization function is during in automobile, described storage battery 4 is chargeable battery, is preferably 24V direct-flow storage battery.
In concrete application process, described voltage acquisition module 1 gathers the battery cell voltage of power battery pack 22 in real time, the voltage data collecting is sent to the control unit of external cell management system.Battery management system calculates the total voltage U of current whole power battery pack 22, obtains the average voltage U of battery cell divided by battery cell number N
m.Get on battery cell equalizing voltage and be limited to U
max, U
max=U
m* (1+20%); Under battery cell equalizing voltage, be limited to U
min, U
min=U
m* (1-20%).If a certain battery cell voltage is higher than limit value U
maxor lower than limit value U
min, battery management system is judged as and need to carries out balanced management to this battery cell.
Described battery management system selects relay 23 break-makes in circuit 2 to select voltage higher than limit value U by controlling battery cell
maxor lower than limit value U
minbattery cell, control reversing switch 9 voltage commutated, keep voltage direction that described voltage balance circuit 3 is exported constant.
Described voltage balance circuit 3 and storage battery 4 carry out voltage balance management to selected battery cell.By controlling the break-make of the first metal-oxide-semiconductor 11, loop can produce alternating voltage U at transformer 7 primary coil two ends
1.Described the second voltage stabilizing circuit 6, with the first voltage stabilizing circuit 5 symmetrical configuration, forms loop jointly with transformer 7 secondary coils, and by controlling the break-make of the second metal-oxide-semiconductor 17, loop can produce alternating voltage U at transformer 7 secondary coil two ends
2.
As shown in Figure 2, be the schematic equivalent circuit to battery cell charging process, in this process, setting the battery cell voltage of selecting circuit to select by battery cell is U
0, and U
0lower than battery cell equalizing voltage lower limit U
min.Battery management system control the second metal-oxide-semiconductor 11 blocks, and controls conducting and the time to chopping of the second metal-oxide-semiconductor 17, makes the second voltage stabilizing circuit 6 produce alternating voltage U at the secondary coil of described transformer 7
2.Alternating voltage U
2change through transformer 7, be loaded on the first voltage stabilizing circuit 5, due to the rectified action of the first diode 15 and the second electric capacity 14, alternating voltage changes direct voltage U into
d2, voltage U
d2size can control by the duty ratio of the second metal-oxide-semiconductor 17 break-makes.Make voltage U if control
d2higher than selected cell, U
d2while being loaded on selected cell, cell is charged.By the selected monomer battery voltage of voltage acquisition module 1 Real-Time Monitoring, when described monomer battery voltage reaches average voltage U
mtime, battery management system control the second metal-oxide-semiconductor 17 disconnects, and selects battery cell to select the relay 23 in circuit 2 to disconnect, and battery cell charging finishes.
As shown in Figure 3, be the schematic equivalent circuit to battery cell discharge process.Setting the battery cell voltage of selecting circuit 2 to select by battery cell is U
0', and U
0' higher than battery cell equalizing voltage upper limit U
max.Battery management system control the second metal-oxide-semiconductor 17 blocks, and controls conducting and the time to chopping of the first metal-oxide-semiconductor 11, makes the first voltage stabilizing circuit 5 produce alternating voltage U at the primary coil of described transformer 7
1.Alternating voltage U
1change through transformer 7, be loaded on the second voltage stabilizing circuit 6, due to the rectified action of the second diode 21 and the 4th electric capacity 20, alternating voltage changes direct voltage U into
d1, voltage U
d1size can control by the duty ratio of the first metal-oxide-semiconductor 11 break-makes.Make voltage U if control
d1higher than storage battery 4, U
d1while being loaded on storage battery 4, storage battery 4 is charged.By the selected monomer battery voltage of voltage acquisition module 1 Real-Time Monitoring, when described monomer battery voltage reaches average voltage U
mtime, battery management system control the first metal-oxide-semiconductor 11 disconnects, and selects battery cell to select the relay 23 in circuit 2 to disconnect, and battery cell electric discharge finishes.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. one kind has the power battery group management circuit of active equalization function, it is characterized in that, described power battery group management circuit comprises: voltage acquisition module (1), battery cell are selected circuit (2), voltage balance circuit (3), storage battery (4) and power battery pack (22);
Described voltage acquisition module (1) is connected with each battery cell in power battery pack (22), be used for the voltage of the each battery cell of Real-time Collection power battery pack (22), and the voltage data collecting be sent to the control unit of external cell management system; Described battery cell selects circuit (2) for selecting the battery cell of the power battery pack (22) that will carry out electric voltage equalization; Described voltage balance circuit (3) and storage battery (4) are for selecting the battery cell of the selected power battery pack of circuit (2) (22) to carry out voltage balance management to battery cell.
2. the power battery group management circuit as claimed in claim 1 with active equalization function, is characterized in that, described battery cell selects circuit (2) to comprise: multiple relays (23) and multiple reversing switch (9); Described power battery pack (22) is composed in series by multiple battery cells;
Mutually between every two battery cells of series connection, all connect a relay (23), each relay (23) is connected with a reversing switch (9), described relay (23) and reversing switch (9) are all by the control unit control of external cell management system, the control unit of external cell management system is by controlling the break-make of corresponding relay (23), respectively corresponding reversing switch (9) incoming end is connected to different battery cells, thereby select the battery cell that will carry out electric voltage equalization.
3. the power battery group management circuit as claimed in claim 1 with active equalization function, is characterized in that, described voltage balance circuit (3) comprises two the first voltage stabilizing circuit (5) and second voltage stabilizing circuits (6) of symmetry mutually;
Described the first voltage stabilizing circuit (5) comprising: the first electric capacity (10), the first metal-oxide-semiconductor (11), the first fly-wheel diode (12), the first resistance (13), the second electric capacity (14) and the first diode (15);
Described the second voltage stabilizing circuit (6) comprising: the 3rd electric capacity (16), the second metal-oxide-semiconductor (17), the second fly-wheel diode (18), the second resistance (19), the 4th electric capacity (20) and the second diode (21);
Described voltage balance circuit (3) connecting single batteries selects the two ends of circuit (2) output as the first voltage stabilizing circuit (5) input, the parallel circuits being formed by described the first metal-oxide-semiconductor (11) and the first diode (15) in sequential series, described the first fly-wheel diode (12) and the parallel circuits by described the first resistance (13) and the second electric capacity (14) formation between described the first voltage stabilizing circuit (5) input two ends, and described the first electric capacity (10) that is also connected in parallel between described the first voltage stabilizing circuit (5) input two ends; Between described the first fly-wheel diode (12) and the first diode (15), be provided with the first fulcrum, the output of described the first fulcrum and reversing switch (9) is connected and between end, is connected with the primary return of transformer (7), as the output of the first voltage stabilizing circuit (5);
The both positive and negative polarity of described storage battery (4) is as the input of the second voltage stabilizing circuit (6), the both positive and negative polarity of storage battery (4), the i.e. parallel circuits being formed by described the second metal-oxide-semiconductor (17) and the second diode (21) in sequential series, described the second fly-wheel diode (18) and the parallel circuits by described the second resistance (19) and the 4th electric capacity (20) formation between the input two ends of the second voltage stabilizing circuit (6), and the both positive and negative polarity of storage battery (4), i.e. described the 3rd electric capacity (16) that is also connected in parallel between the input two ends of the second voltage stabilizing circuit (6); In the circuit that the second fly-wheel diode (18) is connected with the second diode (21), be provided with the second fulcrum, between the positive pole of described the second fulcrum and storage battery (4), be also connected in parallel to the secondary loop of transformer (7), as the output of the second voltage stabilizing circuit (6).
4. the power battery group management circuit as claimed in claim 1 with active equalization function, is characterized in that, described storage battery (4) is chargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057200.0A CN103812192A (en) | 2014-02-20 | 2014-02-20 | Power battery pack managing circuit with active equalization function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057200.0A CN103812192A (en) | 2014-02-20 | 2014-02-20 | Power battery pack managing circuit with active equalization function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849266A (en) * | 2017-03-28 | 2017-06-13 | 合肥工业大学 | A kind of equalizing circuit for charging and discharging lithium battery energy management |
| CN107290673A (en) * | 2016-04-13 | 2017-10-24 | 北京连创驱动技术有限公司 | The passive equalizing circuit and its method of testing of a kind of battery management test system |
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| JP2009080938A (en) * | 2007-09-25 | 2009-04-16 | Panasonic Corp | Power supply system and battery assembly control method |
| CN102122836A (en) * | 2011-04-01 | 2011-07-13 | 北京航空航天大学 | Charging/discharging active equalization circuit for lithium ion power battery pack |
-
2014
- 2014-02-20 CN CN201410057200.0A patent/CN103812192A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009080938A (en) * | 2007-09-25 | 2009-04-16 | Panasonic Corp | Power supply system and battery assembly control method |
| CN102122836A (en) * | 2011-04-01 | 2011-07-13 | 北京航空航天大学 | Charging/discharging active equalization circuit for lithium ion power battery pack |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290673A (en) * | 2016-04-13 | 2017-10-24 | 北京连创驱动技术有限公司 | The passive equalizing circuit and its method of testing of a kind of battery management test system |
| CN106849266A (en) * | 2017-03-28 | 2017-06-13 | 合肥工业大学 | A kind of equalizing circuit for charging and discharging lithium battery energy management |
| CN106849266B (en) * | 2017-03-28 | 2018-03-27 | 合肥工业大学 | A kind of equalizing circuit for charging and discharging lithium battery energy management |
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Application publication date: 20140521 |