CN202353275U - Power battery equalization circuit combining charging and discharging - Google Patents
Power battery equalization circuit combining charging and discharging Download PDFInfo
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- CN202353275U CN202353275U CN 201120536384 CN201120536384U CN202353275U CN 202353275 U CN202353275 U CN 202353275U CN 201120536384 CN201120536384 CN 201120536384 CN 201120536384 U CN201120536384 U CN 201120536384U CN 202353275 U CN202353275 U CN 202353275U
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- battery
- equalization
- charging
- discharging
- discharge
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Abstract
The utility model discloses a power battery equalization circuit combining charging and discharging. The circuit comprises a discharging equalization module, wherein the discharging equalization module is connected to the two ends of each battery in a battery pack, and is controlled by a battery management system of an electric vehicle. A charging equalization module is connected with the two ends of each battery, and comprises a charging switch, wherein the charging switch is controlled by the battery management system, and is connected in series with a constant current charging power supply. Compared with the prior art, the circuit has the advantages that 1, charging equalization is combined with discharging equalization, so that the charging equalization of batteries with low battery voltages can be realized, and the discharging equalization of batteries with high battery voltages also can be realized; 2, the charging equalization is combined with the discharging equalization, so that equalization current is high, equalization speed is high, and equalization effects are good; and 3, the capacities of the batteries are directly equalized, so that the inconsistency of the batteries of the batter pack is remarkably reduced, and the service life of the battery pack is prolonged.
Description
Technical field
The utility model relates to the balanced control technology of a kind of batteries of electric automobile to be improved.
Background technology
Along with the popularization of electric automobile and demonstration operation gradually, dynamic lithium battery applicable cases on electric automobile is more and more general.Widespread usage ferric phosphate reason battery drives the electric automobile operation as electrokinetic cell now.Ferric phosphate reason battery is in groups and after using on the electric automobile; It is better just to have begun consistency; But along with ambient temperature, charge and discharge process, charge and discharge the variation of depth of discharge, it is inconsistent that the voltage of battery can be tending towards, cell voltage can have height has low unbalanced situation.Battery occurs after the unbalanced situation, and battery the problem that the battery pack active volume descends, the electric automobile during traveling mileage reduces can occur in the process that electric automobile uses.And in the battery pack unbalanced battery may super-charge super-discharge electricity, further influence useful life of whole battery group.
Ferric phosphate reason battery is that electric automobile provides the energy, for can the better utilization battery, the use capacity and the useful life of improving battery, need carry out equilibrium to battery.
The equalization methods of existing electrokinetic cell generally is the method that adopts equalization discharge, and this method euqalizing current is little, and time for balance is short, balanced efficient is low, DeGrain, and its basic principle is that unnecessary energy is consumed through discharge resistance from the high battery of voltage.When system detects battery and imbalance occurs, control the switch in the closed battery bypass, in the discharge resistance place in circuit, the battery high to voltage in the system carries out equalization discharge, and the battery unit terminal voltage of whole series battery is reached unanimity.Because the balanced discharge resistor power is little, euqalizing current can not done very greatly, and in the process of using, battery balanced effect is not clearly.
The utility model content
In view of this, the utility model technical problem that will solve provides a kind of electrokinetic cell equalizing circuit that discharges and recharges combination that can reach equalization function fast.
The utility model adopts following scheme to realize:
A kind of electrokinetic cell equalizing circuit that discharges and recharges combination; Comprise the equalization discharge module that is connected in each battery two ends in the battery pack; This equalization discharge module is through the battery management system control of electric automobile; Be connected with the charge balancing module at each battery two ends, this charge balancing module comprises a charge switch through battery management system control, and this charge switch is series in the constant-current charging power.
Wherein, described equalization discharge module comprises discharge resistance and the discharge switch that is series at the battery two ends, and this discharge switch is through battery management system control.
Compared with prior art, the utlity model has following advantage:
1. charge and discharge balancing combines, and not only can carry out charge balancing to the low battery of cell voltage, also can carry out equalization discharge to the high battery of cell voltage simultaneously;
2. charge and discharge balancing combines, and it is big to integrate its euqalizing current, and fast balanced, portfolio effect is good;
3. directly the capacity between battery is carried out equilibrium, significantly reduce the inconsistency of battery between battery pack, is provided the useful life of battery pack.
Description of drawings
Fig. 1 is the utility model embodiment sketch map.
Embodiment
Below will combine accompanying drawing and embodiment that the utility model is described in further detail for the ease of it will be appreciated by those skilled in the art that:
Shown in accompanying drawing 1.The electrokinetic cell equalizing circuit that discharges and recharges combination of present embodiment design is used to improve that existing electrokinetic cell equalizing circuit balancing speed is slow, the defective of portfolio effect difference.
This electrokinetic cell equalizing circuit that discharges and recharges combination can all be controlled through the battery management system in the electric automobile 2 to equalization discharge module 1 of carrying out equilibrium between each battery in the battery pack, comprising being connected each battery two ends and charge balancing module 3, two balance modules.
Wherein, this charge balancing module 3 comprises a charge switch 31 through battery management system 2 controls, and this charge switch 31 is series in the constant-current charging power 32.When certain cell voltage is on the low side, through corresponding charge switch 31 closures of battery management system 2 controls, charge by 32 pairs of these batteries of constant-current charging power, make it consistent with the average voltage of whole battery group.
Wherein, this equalization discharge module 1 comprises discharge resistance 11 and the discharge switch 12 that is series at the battery two ends, and this discharge switch 12 is through battery management system 2 controls.When certain cell voltage is on the low side, through corresponding discharge switch 31 closures of battery management system 2 control,, consume a part of electric weight with discharge resistance 11 conducting of connecting with this battery, make it consistent with the average voltage of whole battery group.
Carrying out the charge balancing process and carry out the equalization discharge process through equalization discharge module 1 through charge balancing module 3 is to carry out when the batteries charging, guarantees that each battery voltage value is consistent in the battery pack.
Specifically, when accomplishing, if the inconsistent words of the voltage of each battery just have to have height low situation is arranged, the center component voltage is higher at batteries charging, and part voltage is on the low side.At this moment, battery management system 2 carries out equilibrium control according to each cell voltage, and battery management system 2 compares the voltage of each battery and the average voltage of battery pack, confirms the electric weight that each battery need charge into or emits low electric weight.If cell voltage is bigger less than average voltage and gap, then need charge into electric weight, carry out charge balancing.If cell voltage is higher poor apart from the Shanghai Communications University with average voltage, then need bleed off a part of electric weight, carry out equalization discharge.Charge balancing module and equalization discharge module receive balanced control command, carry out corresponding operating.As receive balanced initiation command, and the equilibrium sign and the balanced capacity that then send according to battery management system, the battery that needs are charged carries out charge balancing, and the battery that needs are discharged carries out equalization discharge.If receive to stop balanced order, then stop equilibrium immediately.Calculate balanced order if receive; Then converse battery and can charge into capacity according to cell voltage; Calculate on average according to average voltage and can charge into capacity, battery can be charged into capacity and on average can charge into Capacity Ratio, determine which battery and need charge and equalization discharge; The balanced capacity that needs is saved in the memory with balanced sign, in next balancing procedure, carries out equilibrium according to balanced capacity and balanced sign.
More than be the wherein concrete implementation of the utility model, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these conspicuous replacement forms all belong to the protection range of the utility model.
Claims (2)
1. electrokinetic cell equalizing circuit that discharges and recharges combination; Comprise the equalization discharge module (1) that is connected in each battery two ends in the battery pack; This equalization discharge module is characterized in that through battery management system (2) control of electric automobile, is connected with charge balancing module (3) at each battery two ends; This charge balancing module comprises a charge switch (31) through battery management system control, and this charge switch is series in the constant-current charging power (32).
2. the electrokinetic cell equalizing circuit that discharges and recharges combination according to claim 1; It is characterized in that: described equalization discharge module comprises discharge resistance (11) and the discharge switch (12) that is series at the battery two ends, and this discharge switch is through battery management system control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120536384 CN202353275U (en) | 2011-12-20 | 2011-12-20 | Power battery equalization circuit combining charging and discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120536384 CN202353275U (en) | 2011-12-20 | 2011-12-20 | Power battery equalization circuit combining charging and discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353275U true CN202353275U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120536384 Expired - Fee Related CN202353275U (en) | 2011-12-20 | 2011-12-20 | Power battery equalization circuit combining charging and discharging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326439A (en) * | 2013-06-28 | 2013-09-25 | 安科智慧城市技术（中国）有限公司 | Equalization circuit of battery pack and equalization method |
| CN105896686A (en) * | 2016-06-21 | 2016-08-24 | 深圳市沃特玛电池有限公司 | Battery equalization method and device |
| CN108539813A (en) * | 2018-04-17 | 2018-09-14 | 上海理工大学 | A kind of lithium-ion-power cell active equalization method |
| CN110401237A (en) * | 2019-06-15 | 2019-11-01 | 深圳市瑞鼎电子有限公司 | Battery pack balance charging method and system |
| CN111999659A (en) * | 2020-09-30 | 2020-11-27 | 重庆长安新能源汽车科技有限公司 | Characteristic value method-based SOH estimation method for lithium iron phosphate battery and storage medium |
-
2011
- 2011-12-20 CN CN 201120536384 patent/CN202353275U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326439A (en) * | 2013-06-28 | 2013-09-25 | 安科智慧城市技术（中国）有限公司 | Equalization circuit of battery pack and equalization method |
| CN103326439B (en) * | 2013-06-28 | 2016-11-02 | 安科智慧城市技术（中国）有限公司 | The equalizing circuit of set of cells and method |
| CN105896686A (en) * | 2016-06-21 | 2016-08-24 | 深圳市沃特玛电池有限公司 | Battery equalization method and device |
| CN108539813A (en) * | 2018-04-17 | 2018-09-14 | 上海理工大学 | A kind of lithium-ion-power cell active equalization method |
| CN110401237A (en) * | 2019-06-15 | 2019-11-01 | 深圳市瑞鼎电子有限公司 | Battery pack balance charging method and system |
| CN111999659A (en) * | 2020-09-30 | 2020-11-27 | 重庆长安新能源汽车科技有限公司 | Characteristic value method-based SOH estimation method for lithium iron phosphate battery and storage medium |
| CN111999659B (en) * | 2020-09-30 | 2022-05-03 | 重庆长安新能源汽车科技有限公司 | Characteristic value method-based SOH estimation method for lithium iron phosphate battery and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20191220 |