CN101521390A - Battery pack charge balancing circuit - Google Patents
Battery pack charge balancing circuit Download PDFInfo
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- CN101521390A CN101521390A CN200810026590A CN200810026590A CN101521390A CN 101521390 A CN101521390 A CN 101521390A CN 200810026590 A CN200810026590 A CN 200810026590A CN 200810026590 A CN200810026590 A CN 200810026590A CN 101521390 A CN101521390 A CN 101521390A
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery pack charge balancing circuit, which is used for being connected between two charge and discharge ends of a charge and discharge circuit so as to charge a battery pack consisting of a plurality of series connected battery units. The battery pack charge balancing circuit comprises a first balancing control circuit, a second balancing control circuit and a protection circuit. The first balancing control circuit and the second balancing control circuit are connected in series between the two charge and discharge ends of the charge and discharge circuit. The first balancing control circuit is provided with a plurality of control units connected with the corresponding battery units in parallel. The second balancing control circuit is provided with a first branch circuit and a second branch circuit which are connected in parallel. The protection circuit is connected with the control units, the first branch circuit and the second branch circuit. The battery pack charge balancing circuit can control the volume of the charged current by controlling the on or off of the first branch circuit and the second branch circuit, thus leading each battery unit of the battery pack to achieve charge balancing.
Description
Technical field
The present invention relates to a kind of charging circuit, relate in particular to a kind of charge balancing circuit that can carry out impartial charging each battery unit of lithium battery group.
Background technology
Current most of portable digital products all are to provide electric energy by rechargeable battery.And in actual applications, because the single voltage that battery provided is limited, therefore employing provides electric energy with the mode that a plurality of battery units are connected into battery pack to digital product usually.After the electric energy of battery pack exhausts, need charge to battery pack by charging circuit.
Yet when the series connected battery group is charged, the phenomenon of " battery unit imbalance " occurs and influence charging normal of battery pack through regular meeting.This now similarly is not cause owing to remaining capacity in each battery unit in the series battery does not wait.Therefore, when battery pack was charged, the more battery unit of remaining capacity reached the charging saturation condition faster with the battery unit more less than remaining capacity.When a battery unit reaches the charging saturation condition; the protection IC of this battery pack will start overvoltage protection (Over Voltage Protection) function; stop charging circuit to continue, and other battery unit that does not reach the charging saturation condition as yet can not continue charging and reach capacity to batteries charging.During discharge, do not reach the saturated battery unit of charging and start the mistake of protecting IC and put protection (UnderVoltage Protection) function and make battery pack stop outwards to provide electric energy because of reaching a default remaining capacity in advance.Therefore, the phenomenon of " battery unit imbalance " will cause the battery pack frequent charge, thereby influence the normal use of digital product, and influence the useful life of battery.
The influence of above-mentioned in order to overcome " battery unit imbalance " phenomenon has been used a kind of charging circuit of series-connection battery pack in the industry, as shown in Figure 1.This charging circuit of series-connection battery pack is in first resistance R 1 ' and first switch SW 1 ' of the series connection in parallel of the two ends of the first battery B1 ' of a battery pack B ', and the while is at second resistance R 2 ' and the second switch SW2 ' of the two ends of second a battery B2 ' who connects with this first a battery B1 ' series connection in parallel.
When charging, if the first battery B1 ' reaches the charging balance earlier, then this first switch SW, 1 ' conducting.At this moment; originally the part charging current of the first battery B1 ' of flowing through flows into the second battery B2 ' by this first resistance R 1 ' and first switch SW 1 '; thereby prevent to stop charging, and then continue the second battery B2 ' of the state that do not reach capacity is as yet charged because of battery pack B ' starts the over-charge protective function.
But, because the charging current in the actual charging circuit is very big, after starting first switch SW 1 ', will there be a bigger electric current to flow through the above-mentioned first battery B1 ', thereby cause the charging effect of balancing circuitry not good, can not realize the charging balance of battery pack B ' effectively.
Summary of the invention
The objective of the invention is defective, a kind of battery pack charge balancing circuit that effectively battery pack is carried out equilibrium charging is provided at the existence of above-mentioned background technology.
For reaching above-mentioned purpose, the invention provides a kind of battery pack charge balancing circuit, be used to be connected between two charge-discharge end of a charge-discharge circuit, so that a battery pack of being made up of a plurality of battery units that are cascaded is charged.This battery pack charge balancing circuit comprises one first balance control circuit, one second balance control circuit and a protective circuit.First balance control circuit is connected with a charge-discharge end of charge-discharge circuit.This first balance control circuit has a plurality of be connected in series and control units in parallel with the corresponding battery unit respectively, and each control unit comprises a switch element and a resistive element that is connected in series.Second balance control circuit is connected between another charge-discharge end and first balance control circuit of charge-discharge circuit, it has first branch road and second branch road in parallel, first branch road comprises switch element, and second branch road comprises switch element and the resistive element that is cascaded.Protective circuit has a plurality of control ends, and these a plurality of control ends are connected with above-mentioned each switch element respectively.When the switch element of first balance control circuit disconnected, protective circuit was controlled the switch element conducting of first branch road and the switch element of controlling second branch road disconnects; When at least one switch element conducting of first balance control circuit, protective circuit is controlled the switch element conducting of second branch road and the switch element of controlling first branch road disconnects.
As mentioned above; battery pack charge balancing circuit of the present invention is controlled the conducting of first branch road or second branch road of second balance control circuit by this protective circuit; thereby the size of charging current in the control charge-discharge circuit; by the control unit in parallel the battery unit that reaches a unbalance protection starting resistor point of presetting in the battery pack is shunted simultaneously with battery unit; thereby prevent that protective circuit from starting the over-charge protective function prematurely; thereby continued the battery unit of battery pack is charged, effectively to reach the charging balance of each battery unit.
Description of drawings
In Figure of description
Fig. 1 is the circuit diagram of a battery pack balancing circuitry of prior art exposure.
Fig. 2 is the circuit diagram of an embodiment of battery pack balancing circuitry of the present invention.
The description of reference numerals of each element is as follows among the figure:
[background technology]
Battery pack B ' the first battery B1 '
The second battery B2 ', first resistance R 1 '
First switch SW, 1 ' second resistance R 2 '
Second switch SW2 '
[the present invention]
Battery pack charge balancing circuit E
The first balance control circuit C1
The second balance control circuit C2
Charge- discharge end 11,12 first branch road A1
The second branch road A2, first switch SW 1
Second switch SW2 the 3rd switch SW 3
The 4th switch SW 4 the 5th switch SW 5
The 6th switch SW 6 first resistance R 1
Second resistance R 2 the 3rd resistance R 3
The battery pack B first battery unit B1
The second battery unit B2 charge-discharge circuit 10
Protective circuit P control end P1-P6
Embodiment
By describing technology contents of the present invention, structural feature in detail, reached purpose and effect, below exemplify now that embodiment and conjunction with figs. are detailed gives explanation.
Fig. 2 has disclosed the embodiment of battery pack charge balancing circuit E of the present invention.Battery pack charge balancing circuit E of the present invention is connected so that a battery pack B is charged with a charge-discharge circuit 10.This charge-discharge circuit 10 has two charge-discharge end 11,12.This battery pack B is made up of a plurality of battery units that are cascaded.In the present embodiment, battery pack B is in series by the first battery unit B1 and the second battery unit B2.
Described battery pack charge balancing circuit E comprises: the first balance control circuit C1, the second balance control circuit C2 and protective circuit P.Protective circuit P is connected with the charge-discharge end 11 of charge-discharge circuit 10, and to provide operating voltage by this charge-discharge circuit 10 or battery pack B, it has a plurality of control ends.In the present embodiment, protective circuit P has six control ends, and the label of these six control ends is respectively P1-P6.
The first balance control circuit C1 has two control units that are connected in series.Wherein, each control unit is in parallel with a corresponding battery unit among the battery pack B respectively, and each control unit includes a switch element and a resistive element that is connected in series.In the present embodiment, the first balance control circuit C1 has two control units, and wherein, first control unit comprises one first switch SW 1 and one first resistance R 1.This first switch SW 1 is preferably a fet, its grid (Gate Electrode) is connected with the control end P1 of protective circuit P, its drain electrode (Drain Electrode) is connected with the charge-discharge end 11 of charge-discharge circuit 10 and the positive pole of the first battery unit B1, and first resistance R 1 is connected between the negative pole of the source electrode (Source Electrode) of first switch SW 1 and the first battery unit B1; Second control unit comprises a second switch SW2 and one second resistance R 2; second switch SW2 is preferably a fet; its grid is connected with the control end P2 of protective circuit P; its drain electrode is connected with the positive pole of the second battery unit B2, and second resistance R 2 is connected between the negative pole of the source electrode of second switch SW2 and the second battery unit B2.
The second balance control circuit C2 comprises one first branch road A1 parallel with one another and one second branch road A2.The first branch road A1 comprises one the 3rd switch SW 3 and one the 4th switch SW 4 of mutual series connection.The 3rd switch SW 3 and the 4th switch SW 4 are fet, the source electrode of the 3rd switch SW 3 is connected with second resistance R 2 of the first balance control circuit C1 and the negative pole of the second battery unit B2, the drain electrode of the 3rd switch SW 3 is connected with the drain electrode of the 4th switch SW 4, and the grid of the 3rd switch SW 3 is connected with the control end P3 of protective circuit P; The source electrode of the 4th switch SW 4 is connected with the charge-discharge end 12 of charge-discharge circuit 10, and the grid of the 4th switch SW 4 is connected with the control end P4 of protective circuit P.
The second branch road A2 comprises one the 5th switch SW 5, one the 6th switch SW 6 and one the 3rd resistance R 3 of mutual series connection.The 5th switch SW 5 and the 6th switch SW 6 are fet, the source electrode of the 5th switch SW 5 is connected with second resistance R 2 of the first balance control circuit C1 and the negative pole of the second battery unit B2, the drain electrode of the 5th switch SW 5 is connected with the drain electrode of the 6th switch SW 6, and the grid of the 5th switch SW 5 is connected with the control end P5 of protective circuit P; The grid of the 6th switch SW 6 is connected with the control end P6 of protective circuit P; The 3rd resistance R 3 is connected between the charge-discharge end 12 of the source electrode of the 6th switch SW 6 and charge-discharge circuit 10.
The disclosed battery pack charge balancing circuit E of the present invention is as follows to the procedure declaration that battery pack B charges:
Reach a unbalance protection starting resistor point of presetting (this electrical voltage point is usually less than the saturated electrical voltage point of charging) before at the first battery unit B1 and one second battery unit B2; first switch SW 1; second switch SW2; the 5th switch SW 5 and the 6th switch SW 6 are in off-state; the 3rd switch SW 3 and the 4th switch SW 4 are in conducting state; so the charging current of charge-discharge end 11 outputs of charge-discharge circuit 10, through the first battery unit B1 of battery pack B; the second battery unit B2; the 3rd switch SW 3 and the 4th switch SW 4 flow into another charge-discharge end 12 of charge-discharge circuit 10.
When the battery unit among the battery pack B reaches default unbalance protection starting resistor point earlier, protective circuit P triggers the 3rd switch SW 3 and the 4th switch SW 4 disconnects, make the 5th switch SW 5 and 6 conductings of the 6th switch SW, thereby make the 3rd resistance R 3 seal in circuit, to reduce the charging current of battery pack B; Simultaneously, make the control unit conducting in parallel, shunting the charging current of this battery unit, thereby prevent that it from damaging because of overcharging with the battery unit that reaches unbalance protection starting resistor point; At this moment, the control unit in parallel with other battery unit keeps disconnecting, thereby continues with bigger electric current other battery unit to be charged to the charging balance.
Now reaching unbalance protection starting resistor point earlier with the first battery unit B1 is that example describes.
This moment, protective circuit P disconnected second switch SW2, the 3rd switch SW 3 and the 4th switch SW 4, made first switch SW 1, the 5th switch SW 5 and 6 conductings of the 6th switch SW, thereby reduced the charging current of this battery pack charge balancing circuit E by the 3rd resistance R 3.Owing to 1 conducting of first switch SW charging current is branched to first resistance R 1; therefore reduced to flow through the electric current of the first battery unit B1; this has prolonged the first battery unit B1 and has reached the saturated time of charging; thereby prevent that protective circuit P from starting over-voltage protecting function prematurely, charge with continuation other battery unit to battery pack B.
When battery pack B discharges, the 3rd switch SW 3 of the first branch road A1 among the battery pack charge balancing circuit E, the 4th switch SW 4 keep conducting, first switch SW 1, second switch SW2, the 5th switch SW 5, the 6th switch SW 6 are in off-state, thereby provide electric energy by charge-discharge circuit 10 to an electronic installation (figure does not show).
In sum, battery pack charge balancing circuit E of the present invention controls the first branch road A1 or the second branch road A2 conducting by protective circuit P, thus the size of control battery pack B charging current; By control unit the battery unit that reaches unbalance protection starting resistor point among the battery pack B is shunted simultaneously; thereby prevent that protective circuit P from starting the over-charge protective function prematurely; thereby continued other each battery unit of battery pack B is charged, effectively to reach the charging balance of each battery unit.
Above disclosed, only be a preferred embodiment of the present invention, should be not limit interest field of the present invention.Modify or variation as for other equivalence of the present invention, all should be encompassed in the claim scope of the present invention.
Claims (3)
1. battery pack charge balancing circuit is used to be connected between two charge-discharge end of a charge-discharge circuit so that a battery pack of being made up of a plurality of battery units that are cascaded is charged, and it is characterized in that this battery pack charge balancing circuit comprises:
One first balance control circuit, be connected with an end of charge-discharge circuit, this first balance control circuit has a plurality of being connected in series and control unit in parallel with the corresponding battery unit respectively, and each control unit comprises a switch element and a resistive element that is connected in series;
One second balance control circuit, be connected between the other end and first balance control circuit of charge-discharge circuit, it has first branch road and second branch road in parallel, and first branch road comprises switch element, and second branch road comprises a switch element and a resistive element that is cascaded; And
One protective circuit; it has a plurality of control ends; these a plurality of control ends are connected with above-mentioned each switch element respectively; when the switch element of first balance control circuit all disconnects; protective circuit is controlled the switch element conducting of first branch road and the switch element of controlling second branch road disconnects; when at least one switch element conducting of first balance control circuit, protective circuit is controlled the switch element conducting of second branch road and the switch element of controlling first branch road disconnects.
2. require 1 described battery pack charge balancing circuit according to patent, it is characterized in that: the switch element that two of described first routes are connected in series is formed.
3. require 1 described battery pack charge balancing circuit according to patent, it is characterized in that: described second route two switch element and a resistive element are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810026590A CN101521390A (en) | 2008-02-29 | 2008-02-29 | Battery pack charge balancing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810026590A CN101521390A (en) | 2008-02-29 | 2008-02-29 | Battery pack charge balancing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101521390A true CN101521390A (en) | 2009-09-02 |
Family
ID=41081818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810026590A Pending CN101521390A (en) | 2008-02-29 | 2008-02-29 | Battery pack charge balancing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101521390A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887844A (en) * | 2012-12-20 | 2014-06-25 | 诺基亚公司 | Balancing of battery cells connected in parallel |
| WO2017054148A1 (en) * | 2015-09-30 | 2017-04-06 | 长园科技实业股份有限公司 | Battery cell balancing structure |
| CN108790892A (en) * | 2018-06-20 | 2018-11-13 | 重庆明斯克电气有限公司 | A kind of charging monitoring managing device of electric vehicle |
| CN112435569A (en) * | 2020-12-08 | 2021-03-02 | 山东海洋工程装备研究院有限公司 | Gravitational potential energy recovery device |
-
2008
- 2008-02-29 CN CN200810026590A patent/CN101521390A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887844A (en) * | 2012-12-20 | 2014-06-25 | 诺基亚公司 | Balancing of battery cells connected in parallel |
| CN103887844B (en) * | 2012-12-20 | 2016-05-18 | 诺基亚技术有限公司 | The balance of the battery unit being connected in parallel |
| WO2017054148A1 (en) * | 2015-09-30 | 2017-04-06 | 长园科技实业股份有限公司 | Battery cell balancing structure |
| CN108790892A (en) * | 2018-06-20 | 2018-11-13 | 重庆明斯克电气有限公司 | A kind of charging monitoring managing device of electric vehicle |
| CN112435569A (en) * | 2020-12-08 | 2021-03-02 | 山东海洋工程装备研究院有限公司 | Gravitational potential energy recovery device |
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Open date: 20090902 |