CN102185365B - Charging circuit for equalizing activation of multi-section series lithium ion battery pack and battery pack - Google Patents
Charging circuit for equalizing activation of multi-section series lithium ion battery pack and battery pack Download PDFInfo
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- CN102185365B CN102185365B CN2011101400192A CN201110140019A CN102185365B CN 102185365 B CN102185365 B CN 102185365B CN 2011101400192 A CN2011101400192 A CN 2011101400192A CN 201110140019 A CN201110140019 A CN 201110140019A CN 102185365 B CN102185365 B CN 102185365B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a charging circuit for equalizing activation of a multi-section series lithium ion battery pack and a battery pack. The charging circuit is used for charging the battery pack formed by arranging m lithium ion batteries in series and comprises a power frequency transformer, m rectifier bridges, m voltage-measuring control circuits and (m+1) guide lines, wherein the power frequency transformer is used for transforming mains supply to output voltage of m secondary windings corresponding to charging batteries; the m rectifier bridges are used for performing full-wave rectification on alternating current to form a sine wave direct current; the m voltage-measuring control circuits are used for detecting the voltage of each section battery and turning off the charging circuit; and the (m+1) guide lines are used for connecting the voltage-measuring control circuits and the batteries to form a charging loop. By the charging circuit, equalizing charge of all batteries is realized, the battery pack is maintained and preserved, uncharged application capacity of the battery pack is ensured, the service life of the battery pack is prolonged, and most of over-discharged batteries can be continuously available after being activated and charged. Moreover, the circuit is simple and reliable, low in cost, convenient to maintain, and easy for industrialized production.
Description
Technical field
The present invention relates to a kind of multi-section series lithium ionic cell group charging circuit, be specifically related to the balanced activating charge circuit of a kind of multi-section series lithium ionic cell group and power brick.
Background technology
In the last few years, the application of electric bicycle and electric automobile was more and more extensive, the battery pack that provides the lithium ion batteries such as cobalt acid lithium, LiMn2O4, lithium nickelate, ternary material, LiFePO4, lithium titanate by multi-section serial of the energy to form for them.Simultaneously, the application of multiple energy-storage battery is also more and more extensive.This has just produced the problem for these multi-section series lithium ionic cell group chargings.At present, most of lithium ion battery groups all adopt the serial connection charge circuit.As shown in Figure 1, for the batteries charging that the battery by the series connection of m joint forms, form a charge circuit by a power module 01.Its subject matter is after repeatedly discharging and recharging, and occurs Voltage unbalance between the single battery, namely the unequal phenomenon of voltage.After the user uses a period of time, think that battery capacity reduces many.The analysis reason is: in charging process, just cut off charging circuit when wherein the voltage of a batteries reaches the upscale protection value when the protective circuit 02 in the battery pack records, so just so that the electric weight of most of batteries does not have abundance; And in discharge process, just cut off battery voltage output when wherein the voltage of a batteries is lower than the downscale protection value when protective circuit records, this moment, the electric weight of most of batteries did not also discharge.After such situation was repeated multiple times, the use capacity of battery pack reduced gradually, when serious even can only reach half of rated capacity.
For solving the problem that exists in the serial connection charge, many battery pack have adopted the charged in parallel circuit.As shown in Figure 2, to the batteries charging of m batteries series connection, be every batteries current source module 01 in parallel, and every batteries each be connected with current source module with two wires, each forms a charge circuit, forms altogether m charge circuit.Its subject matter have following some: 1) power module uses and to cause too much cost high; 2) wire is many, and complex circuit is so that reliability decrease; 3) charging cable pressure drop affects pressure measurement precision, 4) consistency between each power module is poor, so that each batteries charging is unbalanced.
Summary of the invention
An object of the present invention is to provide the balanced activating charge circuit of a kind of multi-section series lithium ionic cell group.
Charging circuit provided by the invention charges for the battery pack that is composed in series by m joint lithium ion battery, m 〉=2, and each single battery reaches ceiling voltage Vh when being full of electricity.Charging circuit comprises: Industrial Frequency Transformer, in order to civil power is converted to the output voltage with the corresponding m of the battery that a charges secondary winding; M rectifier bridge forms sinusoidal wave direct current in order to alternating current is carried out full-wave rectification; M pressure measurement control circuit is in order to the voltage that detects every batteries and turn-off charging circuit; M+1 root wire is in order to connect pressure measurement control circuit and battery to form charge circuit.In each group charging circuit, the output voltage of the secondary winding of Industrial Frequency Transformer is sent to the input of rectifier bridge, the output of rectifier bridge is connected to respectively elementary positive pole and the negative pole of pressure measurement control circuit, and the secondary positive pole of pressure measurement control circuit and negative pole are connected to respectively positive pole and the negative pole of battery.The positive pole of two adjacent pressure measurement control circuits links to each other with negative pole, shares a wire and is connected to the positive pole of two corresponding batteries and the junction of negative pole, and namely two adjacent charging circuits share a wire.
Further, charging circuit also comprises the indicating circuit that is comprised of the LED of series connection and voltage stabilizing didoe ZD, has stopped charging in order to represent corresponding battery.
Another object of the present invention provides a kind of power brick.
The sheathing material of power brick provided by the invention is that insulating material or insulating material add metal material, and section is packaged with battery pack that the lithium ion battery by m joint series connection forms and above-mentioned charging circuit in the enclosure.
Power brick of the present invention for care and maintenance in the battery charging battery, and owing to having reduced external cable and the plug of battery and charging circuit, when having reduced cost, also improved reliability.
The superiority of charging circuit of the present invention:
1, adopt unskilled labor frequency power transformer and rectifier bridge, the low reliability of cost is strong;
2, to fill be main to string, and to fill be auxiliary, guarantees that every batteries charge volume equates
3, adopt accurate " pressure measurement control circuit " to guarantee that battery does not overcharge;
4, the discrepant battery pack of single battery capacity after once charging, can guarantee that just the voltage of every batteries equates;
5, owing to adopting sinusoidal wave charged with direct current, battery there is activation;
6, the cell to " having put dead " need not be opened power brick and process, under the control of " pressure measurement control circuit ", and " activation " charging in can wrapping.Battery after " activation " can continue to use;
7, every group of charging circuit has LED light, the time successively bright according to indicator light, can judge battery quality state;
8, two adjacent charging circuits share a wire, and number of conductors reduces, Reliability Enhancement.
Therefore, utilize " balanced activating charge circuit " that the lithium ion battery group of multi-section serial is charged, realized the equalizing charge to each batteries, simultaneously care and maintenance battery pack, the use capacity that not only can guarantee battery pack is constant, and can prolong the useful life of battery pack, to the battery pack of " having put dead ", after " activation " charging, most of battery pack can continue to use.Because circuit is simple and reliable, cost is very low, and is easy to maintenance, therefore easily industrialization production.
Description of drawings
Fig. 1 is the schematic diagram of the serial connection charge circuit of prior art;
Fig. 2 is the schematic diagram of the charged in parallel circuit of prior art;
Fig. 3 is the schematic diagram according to the charging circuit of embodiment of the present invention;
Fig. 4 is the schematic diagram of one group of charging circuit of charging circuit of the present invention.
Embodiment
The present invention introduces a kind of New-type charge circuit, and its core technology is " string fill automatically turn and fill control circuit ".As everyone knows, in the serial connection charge circuit, the electric weight that is filled with every batteries equates, and the voltage of easily realizing the every batteries of control in the charged in parallel circuit equates, if can design a kind of like this circuit, in charging process, 90 percent time is serial connection charge, the time of ten Percent is charged in parallel, so just can realize the purpose that electric weight equates and voltage also equates that every batteries is filled with.
The present invention charges for the battery pack that is composed in series by lithium ion batteries such as cobalt acid lithium, LiMn2O4, lithium nickelate, ternary material, LiFePO4, lithium titanate of m joint, m 〉=2, and each single battery reaches ceiling voltage Vh when being full of electricity.As shown in Figure 3, charging circuit comprises: Industrial Frequency Transformer 101, in order to civil power is converted to the output voltage with the corresponding m of the battery that a charges secondary winding; M rectifier bridge 102 forms sinusoidal wave direct current in order to alternating current is carried out full-wave rectification; M pressure measurement control circuit 103 is in order to the voltage that detects every batteries and turn-off charging circuit; M+1 root wire is in order to connect pressure measurement control circuit 103 and battery to form charge circuit.In each group charging circuit, the output voltage of the secondary winding of Industrial Frequency Transformer 101 is sent to the input of rectifier bridge 102, the output of rectifier bridge 102 is connected to respectively elementary positive pole and the negative pole of pressure measurement control circuit 103, and the secondary positive pole of pressure measurement control circuit 103 and negative pole are connected to respectively positive pole and the negative pole of battery.The positive pole of two adjacent pressure measurement control circuits 103 links to each other with negative pole, shares a wire and is connected to the positive pole of two corresponding batteries and the junction of negative pole, and namely two adjacent charging circuits share a wire.The crest voltage Vp of the direct voltage that full-wave rectification forms is a little more than ceiling voltage Vh.Adopt Industrial Frequency Transformer rather than current source module, can reduce cost.Through rectifier bridge 102 sine wave output direct currents, adopting sinusoidal wave direct current to charge has two benefits: the one, and circuit is simple and reliable, and the 2nd, the pulsation charging current has activation to battery.
Pressure measurement control circuit 103 comprises bridge circuit, operational amplifier OpAmp and MOS transistor, as shown in Figure 4, in order to detecting the voltage of battery, and turn-offs charging circuit.Positive pole and negative pole that the input of bridge circuit is connected to respectively battery as secondary positive pole and the negative pole of pressure measurement control circuit, the output of bridge circuit is connected to operational amplifier, the output voltage of operational amplifier is sent to the grid of MOS transistor, and MOS transistor is connected on the output that is connected to rectifier bridge in the pressure measurement control circuit as control switch.When the voltage of battery reached ceiling voltage Vh, bridge circuit detected this voltage, and was sent to operational amplifier, and the output voltage of operational amplifier becomes high level, and MOS transistor is turn-offed, and charging circuit disconnects, and corresponding battery stops charging.
Further, indicating circuit in parallel between the output of rectifier bridge 102 has stopped charging in order to represent corresponding battery.As shown in Figure 4, indicating circuit comprises LED and the voltage stabilizing didoe ZD of series connection.When the voltage of corresponding battery reached ceiling voltage Vh, MOS transistor was turn-offed, and the voltage of the secondary winding of the zero load of Industrial Frequency Transformer raises, direct voltage after the rectification raises, voltage stabilizing didoe ZD is breakdown, and LED is luminous, and the expression battery reaches ceiling voltage and stops charging.
Further, capacitor C in parallel between the output of rectifier bridge 102, as shown in Figure 4, in order to guarantee no longer restarting of pressure measurement control circuit.
Above-mentioned charging circuit is encapsulated in the shell with the battery pack that the lithium ion battery by the series connection of m joint forms, has consisted of power brick of the present invention, wherein m 〉=2.The material of shell is that insulating material or insulating material add metal material, and battery is a kind of in the lithium ion batteries such as cobalt acid lithium, LiMn2O4, lithium nickelate, ternary material, LiFePO4, lithium titanate
The below is example with the battery pack of 12 batteries series connection, specifies charging process.The ceiling voltage of every batteries is 3.60V.
After connecting civil power alternating current 220V, the crest voltage of the direct voltage of output voltage after 12 rectifier bridge rectifications of 12 secondary winding of Industrial Frequency Transformer is 4V, be added to respectively 12 pressure measurement control circuits, if the voltage of every batteries all is lower than 3.60V, 12 pressure measurement control circuits are all connected, and the Voltage Series after 12 tunnel rectifications is got up, and total voltage is approximately about 60V, to the battery pack serial connection charge, only has the loop of 1 serial connection charge by No. 1 wire and No. 13 wires this moment.When certain batteries reached 3.60V in the battery pack, corresponding pressure measurement control circuit recorded this voltage and turn-offs corresponding charging circuit.For example: No. 5 battery at first reaches 3.60V, and No. 5 corresponding pressure measurement control circuits turn-off the 5th group of charging circuit, and No. 5 battery stops charging, and other batteries continue charging.Differently from beginning be, two serial connection charge loops are arranged this moment, one tunnel charge circuit that is formed by No. 1 wire and No. 5 wires, the charge circuit that another road is comprised of No. 6 wires and No. 13 wires.Continue charging, when No. 9 cell voltages reached 3.60V, No. 9 corresponding pressure measurement control circuits turn-offed the 9th group of rectifying output circuit, and No. 9 battery stops charging.Formed 3 charge circuits this moment, No. 1 wire and No. 5 wires form 1 loop, and No. 6 wires and No. 9 wires form 1 loop, and No. 10 wires and No. 13 wires form 1 loop, continue charging, by that analogy, until all batteries all are charged to 3.60V.In the whole charging process, the most of the time is serial connection charge, and this has just guaranteed the electric weight of the charging of every batteries is equated.In the complete charge process, by pressure measurement control circuit control single battery stop fill, because 2 to No. 12 wires do not have electric current in the serial connection charge process, the voltage that the pressure measurement control circuit records is exactly cell voltage, do not have the impact of line drop, so just guaranteed that 2 to No. 11 batteries stop the precision of charging voltage.No. 1 battery and No. 12 batteries be because No. 1 wire and No. 13 wires have the impact of line drop, and the time of charging is longer, but the voltage when stopping filling at last equates with other batteries.
It should be noted that at last the purpose of publicizing and implementing example is to help further to understand the present invention, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications all are possible.Therefore, the present invention should not be limited to the disclosed content of embodiment, and the scope of protection of present invention is as the criterion with the scope that claims define.
Claims (10)
1. charging circuit, be used for charging for the battery pack that is composed in series by m joint lithium ion battery, described lithium ion battery is a kind of in cobalt acid lithium, LiMn2O4, lithium nickelate, ternary material, LiFePO4, the lithium titanate, it is characterized in that, described charging circuit comprises: Industrial Frequency Transformer, in order to civil power is converted to the output voltage with the corresponding m of the battery that a charges secondary winding; M rectifier bridge forms sinusoidal wave direct current in order to alternating current is carried out full-wave rectification; M pressure measurement control circuit is in order to the voltage that detects every batteries and turn-off charging circuit; M+1 root wire is in order to connect pressure measurement control circuit and battery to form charge circuit; In each group charging circuit, the output voltage of Industrial Frequency Transformer is sent to the input of rectifier bridge, the output of rectifier bridge is connected to respectively elementary positive pole and the negative pole of pressure measurement control circuit, the secondary positive pole of pressure measurement control circuit and negative pole are connected to respectively positive pole and the negative pole of battery, the secondary positive pole of two adjacent pressure measurement control circuits links to each other with negative pole, share a wire and be connected to the positive pole of two corresponding batteries and the junction of negative pole, wherein m 〉=2.
2. charging circuit as claimed in claim 1 is characterized in that, the crest voltage Vp of the direct voltage that full-wave rectification forms is higher than the ceiling voltage Vh of battery.
3. charging circuit as claimed in claim 1, it is characterized in that, described pressure measurement control circuit comprises bridge circuit, operational amplifier and MOS transistor, positive pole and negative pole that the input of described bridge circuit is connected to respectively battery as secondary positive pole and the negative pole of described pressure measurement control circuit, the output of described bridge circuit is connected to described operational amplifier, the output voltage of described operational amplifier is sent to the grid of described MOS transistor, and described MOS transistor is connected on the output that is connected to rectifier bridge in the described pressure measurement control circuit as control switch.
4. charging circuit as claimed in claim 3, it is characterized in that, when the voltage of battery reaches ceiling voltage Vh, described bridge circuit detects this voltage, and be sent to described operational amplifier, and the output voltage of described operational amplifier becomes high level, and this moment, MOS transistor was turn-offed, charging circuit disconnects, and corresponding battery stops charging.
5. charging circuit as claimed in claim 3 is characterized in that, further comprises indicating circuit, and described indicating circuit is connected in parallel on the output of described rectifier bridge, and described indicating circuit comprises LED and the voltage stabilizing didoe ZD of series connection.
6. charging circuit as claimed in claim 5, it is characterized in that, when the voltage of corresponding battery reaches ceiling voltage Vh, described MOS transistor is turn-offed, the voltage of the secondary winding of the zero load of described Industrial Frequency Transformer raises, and the direct voltage after the rectification raises, and described voltage stabilizing didoe ZD is breakdown, described LED is luminous, and the expression battery reaches ceiling voltage Vh and stops charging.
7. charging circuit as claimed in claim 1 is characterized in that, further comprises capacitor, and described Parallel-connected Capacitor is at the output of rectifier bridge, in order to guarantee no longer restarting of described pressure measurement control circuit.
8. power brick, its main body comprises a shell, it is characterized in that, is packaged with the battery pack that is comprised of m joint lithium ion battery in the inside of described shell and such as one of right 1 to 7 described charging circuit, wherein m 〉=2.
9. power brick as claimed in claim 8 is characterized in that, described battery is a kind of in the lithium ion battery of cobalt acid lithium, LiMn2O4, lithium nickelate, ternary material, LiFePO4, lithium titanate.
10. power brick as claimed in claim 8 is characterized in that, the material of described shell is that insulating material or insulating material add metal material.
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| CN2011101400192A CN102185365B (en) | 2011-05-27 | 2011-05-27 | Charging circuit for equalizing activation of multi-section series lithium ion battery pack and battery pack |
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| CN2011101400192A CN102185365B (en) | 2011-05-27 | 2011-05-27 | Charging circuit for equalizing activation of multi-section series lithium ion battery pack and battery pack |
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| CN102185365B true CN102185365B (en) | 2013-03-06 |
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| FR2982089B1 (en) * | 2011-10-26 | 2013-11-01 | Renault Sa | METHOD FOR BALANCING THE LEVEL OF CHARGE AND DISCHARGE OF A BATTERY BY SWITCHING ITS BLOCKS OF CELLS |
| CN103389465B (en) * | 2012-05-11 | 2015-10-21 | 光阳工业股份有限公司 | The quantity measuring method of battery |
| CN104810496A (en) * | 2014-01-23 | 2015-07-29 | 广西电网公司百色供电局 | Two-way crossover circuit |
| KR101832577B1 (en) * | 2015-02-10 | 2018-02-26 | 스토어닷 엘티디. | High-power charging devices for charging energy-storage devices |
| CN105375761B (en) * | 2015-10-26 | 2017-12-15 | 广州金升阳科技有限公司 | The loop control circuit of inverse-excitation type switch power-supply a kind of and apply its inverse-excitation type switch power-supply |
| CN107947294B (en) * | 2017-12-25 | 2021-02-09 | 四川长虹电器股份有限公司 | Battery management system of hybrid power battery core |
| CN111262285B (en) * | 2018-12-03 | 2022-02-18 | 丰能科技股份有限公司 | Battery management system and method thereof |
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| CN2424560Y (en) * | 2000-03-30 | 2001-03-21 | 黄以安 | Balance charger of battery |
| CN1641966A (en) * | 2004-01-14 | 2005-07-20 | 财团法人工业技术研究院 | Equating circuit for serial battery |
| CN202103444U (en) * | 2011-05-27 | 2012-01-04 | 北京欧满德科技发展有限公司 | Battery pack and circuit for performing charging and activation in equalized manner for battery group formed by multiple serially-connected lithium ion batteries |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5525199B2 (en) * | 2009-07-17 | 2014-06-18 | 八和エレック株式会社 | Battery capacity control device for battery pack |
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| CN2424560Y (en) * | 2000-03-30 | 2001-03-21 | 黄以安 | Balance charger of battery |
| CN1641966A (en) * | 2004-01-14 | 2005-07-20 | 财团法人工业技术研究院 | Equating circuit for serial battery |
| CN202103444U (en) * | 2011-05-27 | 2012-01-04 | 北京欧满德科技发展有限公司 | Battery pack and circuit for performing charging and activation in equalized manner for battery group formed by multiple serially-connected lithium ion batteries |
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