CN203193337U - Power battery pack discharge equalizer - Google Patents
Power battery pack discharge equalizer Download PDFInfo
- Publication number
- CN203193337U CN203193337U CN 201320188893 CN201320188893U CN203193337U CN 203193337 U CN203193337 U CN 203193337U CN 201320188893 CN201320188893 CN 201320188893 CN 201320188893 U CN201320188893 U CN 201320188893U CN 203193337 U CN203193337 U CN 203193337U
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- battery pack
- control unit
- power battery
- mcu control
- discharge
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Abstract
The utility model relates to a power battery pack discharge equalizer. The power battery pack discharge equalizer comprises an MCU control unit, a voltage collection unit, and an equalizer circuit, wherein the equalizer circuit comprises discharge resistors used in a series connection at two ends of positive and negative electrodes of each single battery of a power battery pack and corresponding on-off switches, and an output end of the MCU control unit controls and connects all the on-off switches in the equalizer circuit. By real-time detection of voltages of each single battery of the batter pack, the MCU control unit controls the equalizer circuit to start or stop according to the detected voltage values. In a discharging and equalizing process, the external equalizer circuit allows the single batteries not discharged completely to continue to discharge, thereby preventing the single batteries not discharged completely in the battery pack from reaching overcharge protection conditions ahead of time to be protected in the subsequent charging process. The discharge resistors transform electric energy into heat energy, the heat energy is released and rapidly radiated to the space, effect of the heat energy generated by the resistors on the batteries themselves is greatly reduced, and heat accumulation is prevented.
Description
Technical field
The utility model relates to a kind of power battery pack equalization discharge device, belongs to the battery technology field.
Background technology
Characteristics such as lithium ion battery has that specific energy height, specific power are big, long service life, working range are wide, in people's real life, obtained using widely as power supply or back-up source, over past ten years, under the support and promotion of national governments, the technology of lithium ion battery develops rapidly, and its industrialization is also pushed ahead.Be successfully applied in pure electric automobile, the hybrid vehicle at present.As pure electric automobile, hybrid vehicle driving power, in order to reach certain electric pressure, battery usually needs series connection to use in groups.Yet, owing to can not accomplish in full accord in production and the use, all can there be certain difference at aspects such as self discharge and charge efficiencies between the battery, and the battery that self discharge is big, charge efficiency is low is along with the increase of cycle-index, present " positive feedback ", make that the otherness between the battery is amplified rapidly, make the capacity of battery pack and capacity usage ratio descend, when can not meeting consumers' demand, namely be replaced, cause the serious wasting of resources.
In order to address this problem, people adopt the method for bypass battery pack to be implemented balanced.Consideration for cost and control complexity; adopt the conductive discharge equilibrium to obtain using widely during charging; yet; because present stage battery pack use capacity is increasing; generally require big electric current quick charge during charging; the equalization discharge mode that adopts during charging; euqalizing current can not be too big; unsatisfactory to the battery pack balancing effect; monomer battery voltage in short time in the battery pack can not constantly cause occurring over-charge protective; and battery pack produces heat when itself is because of work when charging, and the loss that produces by conductive discharge is transformed into heat again, and the battery pack heat is further improved; cause the whole heating of battery pack serious; be unfavorable for using between the battery group leader constantly, therefore, the equalization discharge mode that adopts during batteries charging is subjected to bigger restriction with portfolio effect on electric current.
The utility model content
The purpose of this utility model provides a kind of power battery pack equalization discharge device, reaches the over-charge protective condition in advance and protect the battery capacity that is caused to bring into play the problem of loss when next charging to solve the cell that is not discharged in the battery pack.
The utility model provides a kind of power battery pack equalization discharge device for solving the problems of the technologies described above, this balancer comprises the MCU control unit, voltage acquisition unit and equalizing circuit, equalizing circuit comprises discharge resistance and the on-off switch corresponding with each cell of power battery pack, discharge resistance and on-off switch are serially connected in corresponding cell positive and negative end in the power battery pack, voltage acquisition unit is used for connecting each cell of battery pack, the output of voltage acquisition unit links to each other with the MCU control unit, each on-off switch in the output control connection equalizing circuit of MCU control unit.
Described balancer also comprises temperature collecting cell, the output of this temperature collecting cell links to each other with the input of MCU control unit, be used for gathering the temperature of power battery pack, described balancer also comprises fan, and the control end of this fan links to each other with the output of MCU control unit.
Described balancer also comprises buzzer, and the control end of buzzer links to each other with the output of MCU control unit.
The beneficial effects of the utility model are: the utility model is by detecting the voltage of each cell of battery pack in real time; the MCU control unit is controlled the start and stop of equalizing circuit according to detected each magnitude of voltage; equalizing circuit by external mode is in the equalization discharge process; the cell that is not discharged in the battery pack is continued discharge; thereby can prevent that the cell that is not discharged in the battery pack from reaching the over-charge protective condition in advance and protect when next charging; discharge resistance converts electrical energy into heat energy and discharges; and be dispersed into the space rapidly; obviously reduce the heat of resistance generation to the influence that battery itself produces, prevent heat accumulation.
Description of drawings
Fig. 1 is the structured flowchart of power battery pack equalization discharge device of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
As shown in Figure 1, power battery pack equalization discharge device of the present utility model comprises the MCU control unit, voltage acquisition unit, temperature collecting cell, equalizing circuit, fan and buzzer, equalizing circuit comprises discharge resistance and the on-off switch corresponding with each cell of power battery pack, discharge resistance and on-off switch are serially connected in corresponding cell positive and negative end in the power battery pack, voltage acquisition unit is used for connecting each cell of battery pack, the output of voltage acquisition unit links to each other with the MCU control unit, each on-off switch in the output control connection equalizing circuit of MCU control unit, the control end of fan and buzzer all links to each other with the output of MCU control unit, voltage acquisition unit will detect each monomer battery voltage in real time and send to the MCU control unit, when monomer battery voltage reaches certain value, the MCU control unit is by control switch pipe S1, S2,, Sn controls needed balanced capacity.The input of MCU control unit also is connected with temperature collecting cell, this temperature collecting cell is used for gathering the temperature of battery pack, in case temperature surpasses set point, the MCU control unit will be controlled fan and open, to reduce the temperature of battery pack, in addition, the buzzer of MCU control unit control connection reaches set point and sends alarm signal for reaching certain value or battery pack temperature at cell voltage.
Its course of work is as follows: when battery pack after being discharged protection fully; voltage acquisition unit will detect each monomer battery voltage in real time and send to the MCU control unit; when monomer battery voltage reaches certain value; the MCU control unit is by control switch pipe S1; S2;, Sn controls needed balanced capacity.Balanced capacity and time for balance and euqalizing current have following relation: t=C/Iequ wherein, and C is balanced capacity, and Iequ is euqalizing current, and t is time for balance, Iequ=Ud/R wherein, and Ud is the monomer voltage value, R is discharge resistance.By resistance R the capacity that is not discharged in the cell is discharged, the higher battery of voltage is drawn close to the lower battery of voltage by the resistance R power consumption.In balancing procedure, euqalizing current Iequ is not constant value, and it will reduce with the decline of battery terminal voltage.But because euqalizing current is less, generally in 100mA～1A, therefore can thinks that Iequ is approximately constant, and obtain time for balance by approximate calculation.For example, it is 0.5Ah that a battery needs balanced capacity, balanced discharge resistance 10 Ω, Ud is 3.4V, time for balance t=0.5 ÷ (3.4 ÷ 10) * this shows in 60 minutes so, the calculating of circuit and control are comparatively simple, do not need complicated energy storage and transfer process, and time for balance is grasped easily, has actual application value.
The equalization methods that comes balancing capacity by balanced voltage when control, should take into account following some: the selection that at first is the balanced discharge resistance R, during equalizing circuit work, the battery that energy is high can discharge by the form of overdischarge resistance with heat energy, if this moment, resistance temperature was too high, may cause the circuit thermal runaway, there is potential safety hazard, successively, resistance value can not be too small, and on the other hand, euqalizing current has directly determined time for balance, if euqalizing current is too small, can make time for balance long, do not reach equalization request, and the size of euqalizing current be to be determined by discharge resistance, the more big euqalizing current of resistance value is more little, therefore resistance value again can not be excessive, and to sum up, can resistance value suitably be chosen is the key of portfolio effect.Next is the setting of equalizing voltage threshold value a, and the size of voltage threshold has directly determined the startup of equalizing circuit and the moment of closing, if voltage threshold establish too high, then time for balance is long, has not only consumed energy in vain, and each battery of battery pack is done harm rather than good.Last all very startups of circuit and closing, after triggering equalization function, voltage acquisition unit regularly detects each monomer battery voltage of battery pack, the cell that surpasses setting threshold needs closed corresponding switching tube to discharge to start equalizing circuit, if the voltage consistency of cell is got back in the threshold value, then disconnect the switching tube of all equalizing circuits, stop equilibrium.
Power battery pack equalization discharge device of the present utility model can reach the SOC balance of battery at short notice, and circuit working is stable, can effectively prevent the expansion of battery inconsistency, realize the reasonable disposition of energy, improve the service efficiency of whole Battery pack, actual use has practicality to battery pack.
Claims (3)
1. power battery pack equalization discharge device, it is characterized in that: this balancer comprises the MCU control unit, voltage acquisition unit and equalizing circuit, equalizing circuit comprises discharge resistance and the on-off switch corresponding with each cell of power battery pack, discharge resistance and on-off switch are serially connected in corresponding cell positive and negative end in the power battery pack, voltage acquisition unit is used for connecting each cell of battery pack, the output of voltage acquisition unit links to each other with the MCU control unit, each on-off switch in the output control connection equalizing circuit of MCU control unit.
2. power battery pack equalization discharge device according to claim 1, it is characterized in that: described balancer also comprises temperature collecting cell, the output of this temperature collecting cell links to each other with the input of MCU control unit, be used for gathering the temperature of power battery pack, described balancer also comprises fan, and the control end of this fan links to each other with the output of MCU control unit.
3. power battery pack equalization discharge device according to claim 1, it is characterized in that: described balancer also comprises buzzer, the control end of buzzer links to each other with the output of MCU control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320188893 CN203193337U (en) | 2013-04-15 | 2013-04-15 | Power battery pack discharge equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320188893 CN203193337U (en) | 2013-04-15 | 2013-04-15 | Power battery pack discharge equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203193337U true CN203193337U (en) | 2013-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320188893 Expired - Fee Related CN203193337U (en) | 2013-04-15 | 2013-04-15 | Power battery pack discharge equalizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203193337U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836306A (en) * | 2015-05-26 | 2015-08-12 | 上海工程技术大学 | Battery management system |
| CN116914289A (en) * | 2023-09-12 | 2023-10-20 | 电子科技大学长三角研究院(湖州) | Battery pack with self-balancing voltage |
-
2013
- 2013-04-15 CN CN 201320188893 patent/CN203193337U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836306A (en) * | 2015-05-26 | 2015-08-12 | 上海工程技术大学 | Battery management system |
| CN116914289A (en) * | 2023-09-12 | 2023-10-20 | 电子科技大学长三角研究院(湖州) | Battery pack with self-balancing voltage |
| CN116914289B (en) * | 2023-09-12 | 2023-12-15 | 电子科技大学长三角研究院(湖州) | Battery pack with self-balancing voltage |
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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: 20130911 Termination date: 20190415 |