CN112838653A - Battery pack balance control circuit and method based on battery module - Google Patents
Battery pack balance control circuit and method based on battery module Download PDFInfo
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- CN112838653A CN112838653A CN202110366342.5A CN202110366342A CN112838653A CN 112838653 A CN112838653 A CN 112838653A CN 202110366342 A CN202110366342 A CN 202110366342A CN 112838653 A CN112838653 A CN 112838653A
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- 238000010586 diagram Methods 0.000 description 8
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- 238000005265 energy consumption Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a battery pack equalization control circuit and a battery pack equalization control method based on a battery module, which relate to the technical field of battery equalization.
Description
Technical Field
The invention relates to the technical field of battery equalization, in particular to a battery pack equalization control circuit and method based on a battery module.
Background
As is known, the power battery is an important component of the electric vehicle, and largely determines the performance of the electric vehicle.
The inconsistency of the single batteries inevitably exists in the manufacturing process, and the uncertainty of the charging and discharging mode, the current magnitude and the duration of the battery pack is caused by the frequent and irregular switching of the working conditions of starting and stopping, accelerating climbing, decelerating braking and the like of the electric automobile, so that the nonuniformity of the thermal environment in the battery pack is caused, and the inconsistency among the batteries is aggravated. This increased inconsistency will lead to a rapid decay in cell life to failure.
The equalization board is a hardware guarantee for battery equalization, is the basis for equalization performance optimization, and can effectively improve the inconsistency of the battery pack. Therefore, how to provide a battery pack balance control circuit and method based on a battery module has become a long-term technical demand of those skilled in the art.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides a battery pack equalization control circuit and method based on a battery module, which can improve the inconsistency of a battery pack, the equalization energy efficiency, the time efficiency and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a group battery equalization control circuit based on battery module, includes the battery module, uses electrical apparatus, battery package and equalizer plate, the battery module is connected with electrical apparatus for using the power supply, and the battery module is connected the battery package and is carried out charge-discharge equalization to the group battery that needs the equilibrium in the battery package, and the battery package makes the electric quantity of battery module stable at reasonable interval all the time for the power supply of battery module, sets up the equalizer plate between battery module and battery package and carries out signal transmission, and the equalizer plate is arranged in gathering each group battery in the battery package, the information of battery module, judges whether each group battery needs the equilibrium and whether the battery module needs to charge and form group battery equalization control circuit based on battery module.
The battery pack balance control circuit based on the battery module is characterized in that after the battery module is opened through Q1, the battery module is responsible for supplying power to an electric appliance after being reduced in voltage through low-voltage DC/DC.
According to the battery pack balancing control circuit based on the battery module, the battery module acquires the state information of the battery packs in the battery pack through the balancing plate, judges the balancing condition, starts Q3, and starts balancing each battery pack after boosting through low-voltage DC/DC.
The battery pack comprises a plurality of battery packs, the plurality of battery packs are connected in series, and each battery pack is connected with low-voltage DC/DC through an MOSFET.
According to the battery pack balance control circuit based on the battery module, each battery pack charges the battery module through the opening of Q2 through high-voltage DC/DC.
The battery pack balancing control circuit based on the battery module is characterized in that each battery pack is connected by a plurality of single batteries, and each single battery is connected with each other after passing through low-voltage DC/DC through a diode and an MOSFET respectively.
According to the battery pack balance control circuit based on the battery module, the on-off of the MOSFET is responsible for the balance of each single battery.
The battery pack balance control circuit based on the battery module is characterized in that the diode is responsible for rectification.
The battery pack balance control circuit based on the battery module is used for enabling each system to normally operate.
A method for a battery pack balance control circuit based on a battery module specifically comprises the following steps:
firstly, after a main switch is switched on, a battery module starts to work, power is supplied to an electric appliance after voltage reduction, and each system of a vehicle starts to operate after error-free detection;
secondly, when each system of the vehicle starts to work, the balancing board starts to acquire relevant information of the battery pack and the battery module, and judges whether each battery pack needs to be balanced and whether the battery module needs to be charged;
thirdly, after receiving the signal of the equalizing plate, the battery module carries out charging and discharging on each battery pack so as to achieve the equalizing purpose of the battery packs;
fourthly, all the single batteries are connected inside the battery pack and balanced through an energy conversion balancing circuit;
fifthly, in the equalizing process, the equalizing plate monitors the electric quantity of the battery module, and the whole battery pack is responsible for charging the battery module, so that the electric quantity of the battery module is always stable in a reasonable interval, and the whole system can stably operate.
By adopting the technical scheme, the invention has the following advantages:
the invention aims to improve the inconsistency of the battery pack, improve the output power of the battery pack and increase the driving range by arranging the equalizing plate and the battery module, the battery module is responsible for supplying power to an electric appliance after voltage reduction, the equalizing plate acquires the relevant information of the battery pack and the battery module, and judges whether each battery pack needs to be equalized and whether the battery module needs to charge the battery pack, so that the electric quantity of the battery module is stabilized in a proper interval.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a circuit diagram of battery pack equalization control based on battery modules according to the present invention;
FIG. 3 is a circuit diagram of a battery module for supplying power to an electrical appliance in the present invention;
FIG. 4 is a circuit diagram of the battery pack charge equalization circuit of the battery module of the present invention;
FIG. 5 is a circuit diagram of the battery module to battery pack discharge equalization of the present invention;
FIG. 6 is a circuit diagram of a battery pack charging circuit for a battery module according to the present invention;
fig. 7 is a circuit diagram of a cell balancing circuit inside the battery pack according to the present invention.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the invention;
the battery pack balance control circuit based on the battery module comprises the battery module, an electric appliance, a battery pack and a balance plate, wherein the battery module is connected with the electric appliance to supply power to the electric appliance, and when the electric automobile starts to operate, the battery module supplies power to low-voltage electric appliances to ensure that each low-voltage system stably operates; the battery pack is connected with the battery pack and performs charge and discharge equalization on the battery pack needing equalization in the battery pack, the battery pack supplies power for the battery module to enable the electric quantity of the battery module to be stable in a reasonable interval all the time, the equalizing plate is arranged between the battery module and the battery pack to transmit signal signals, the equalizing plate is used for collecting information of each battery pack and the battery module in the battery pack and judging whether each battery pack needs equalization and whether the battery module needs charging to form the battery pack equalization control circuit based on the battery module.
In implementation, the battery module supplies power to an electric appliance, the battery module charges the battery pack, the battery module absorbs energy of the battery pack, all single batteries in the battery pack are balanced, and the battery pack charges the battery module, as shown in fig. 2, the battery module plays a crucial role in the whole system, and the battery module is started through a MOSFET (Q1), and then is subjected to voltage reduction through low-voltage DC/DC and then is responsible for supplying power to the electric appliance; the battery module acquires the state information of the battery packs in the battery pack through the balancing board, judges the balancing condition, starts the MOSFET (Q3), and starts balancing each battery pack after boosting through the low-voltage DC/DC.
Further, the battery pack is composed of a plurality of battery packs, the plurality of battery packs are connected in series, each battery pack is connected with the low-voltage DC/DC through a MOSFET (Q4-QN), and each battery pack charges the battery module through the high-voltage DC/DC by turning on the MOSFET (Q2).
Further, each battery pack is connected with each other through a plurality of single batteries (B1-BM), each single battery is connected with each other through a diode (D1-DM) and a MOSFET (QB 1-QBM) after passing through low-voltage DC/DC, wherein the on-off of the MOSFET (QB 1-QBM) is responsible for the balance of each single battery, and the diode (D1-DM) is responsible for rectification.
A method for a battery pack balance control circuit based on a battery module specifically comprises the following steps:
firstly, after a main switch is switched on, a battery module starts to work, power is supplied to an electric appliance after voltage reduction, and each system of a vehicle starts to operate after error-free detection;
secondly, when each system of the vehicle starts to work, the balancing board starts to acquire relevant information of the battery pack and the battery module, and judges whether each battery pack needs to be balanced and whether the battery module needs to be charged;
thirdly, after receiving the signal of the equalizing plate, the battery module carries out charging and discharging on each battery pack so as to achieve the equalizing purpose of the battery packs;
fourthly, all the single batteries are connected inside the battery pack and balanced through an energy conversion balancing circuit;
fifthly, in the equalizing process, the equalizing plate monitors the electric quantity of the battery module, and the whole battery pack is responsible for charging the battery module, so that the electric quantity of the battery module is always stable in a reasonable interval, and the whole system can stably operate.
When the invention is implemented specifically, the working flow chart is shown in fig. 1, and when the electric automobile starts to run, the battery module supplies power to the low-voltage electric appliances so as to ensure the stable operation of each low-voltage system.
When each system of the electric automobile normally operates, the balancing board starts to collect related information of the battery pack, the battery module and the like, and judges whether each battery pack needs to be balanced and whether the battery module needs to be charged. And if the battery pack needs to be balanced, the balancing system starts to work.
And in the balancing process, judging the electric quantity information of the battery module, if the electric quantity of the battery module is higher than the balancing set value of the battery module, charging the battery pack with lower energy in the battery pack by using the battery module so as to achieve the aim of balancing the battery pack.
If the electric quantity of the battery module is lower than the balance set value of the battery module, the battery module is charged by utilizing the battery pack with higher energy in the battery pack so as to achieve the aim of balancing the battery pack.
In addition, when each system of the whole vehicle works normally, whether the voltage of the battery module is lower than a set value of the normal working voltage of the low-voltage system or not is judged, if the voltage of the battery module is lower than the set value, the battery module needs to be charged by the battery pack, and the normal operation of the low-voltage system of the whole vehicle is ensured.
As shown in fig. 2, a battery pack balancing control circuit diagram based on the battery module in the present invention is provided, which includes an electrical appliance, the battery module, N battery packs, 2 low voltage DC/DC,1 high voltage DC/DC, and N MOSFET switches. The operation principle of the circuit and the operation state and action of each component will now be described in detail with reference to fig. 2.
As shown in fig. 3, the battery module plays a crucial role in the whole system, and when the battery module starts to work, the battery module is powered on for the electrical appliance after being stepped down by the low voltage DC/DC after being turned on by the MOSFET (Q1).
Judging whether the equalization condition is met or not through the battery pack and battery module related state information acquired by the equalization board, if the equalization condition (1) is met, namely the energy imbalance of each battery pack in the battery pack reaches an equalization threshold, and the battery module electricity quantity is higher than the battery module equalization set value, as shown in fig. 4, starting a MOSFET (Q3), and performing charge equalization on the battery pack with lower energy to be equalized in the battery pack through low-voltage DC/DC; if the equalization condition (2) is met, that is, the energy imbalance of each battery pack in the battery pack reaches the equalization threshold, and the electric quantity of the battery module is lower than the equalization set value of the battery module, as shown in fig. 5, the MOSFET (Q3) is turned on, and the battery pack with higher energy to be equalized in the battery pack charges the battery module through low-voltage DC/DC, so that the discharge equalization is realized.
Wherein N battery packs are connected in series, each battery pack being connected to the low voltage DC/DC via a MOSFET (Q4-QN). When a certain battery pack needs to be charged or discharged, the MOSFET connected with the certain battery pack is opened to balance the battery pack, and the MOSFET is closed after the equalization is completed. The MOSFETs of the remaining battery packs in a normal operation state are kept in an off state.
As shown in fig. 6, during operation, when the energy of the battery module is lower than a set value, the whole battery pack is stepped down by the high-voltage DC/DC, and then the battery module is charged through the turn-on of the MOSFET (Q2), so as to ensure the normal operation of the whole low-voltage system.
As shown in FIG. 7, a diagram of a cell balancing circuit inside the battery pack of the present invention is shown, which includes M cells (B1-BM), M diodes (D1-DM), M MOSFETs (QB 1-QBM), and M low-voltage DC/DC. The operation principle of the circuit and the operation states and actions of the respective components will be described in detail with reference to fig. 3.
In each battery pack, M unit cells (B1-BM) are connected. Wherein, each single battery is connected with each other through a diode (D1-DM) and a MOSFET (QB 1-QBM) after passing through low-voltage DC/DC.
When the electric quantity of a certain single battery is lower than or higher than a normal value, the MOSFET (QB 1-QBM) is switched on and off, energy conversion is carried out through low-voltage DC/DC, and the diode (D1-DM) is responsible for rectification to achieve balance of all the single batteries.
The invention has the following beneficial effects:
(1) all the battery packs can transfer redundant energy or supplement energy in time to improve the inconsistency of the whole battery pack.
(2) For a large-capacity series battery pack, the equalizing circuit not only simplifies the circuit structure, but also can flexibly switch the charging and discharging of the battery module on the battery pack according to the state parameters of the current battery pack, regulate and control the equalizing mode in real time, reduce the equalizing energy consumption and improve the equalizing speed.
(3) Energy conversion balance adopted by the single batteries in the battery pack enables each single battery to be flexibly regulated and controlled during balance, and the balance speed is high.
(4) For the balance control circuit and method taking the battery module as the core, the battery module not only reduces the balance energy consumption and improves the balance speed, but also replaces the low-voltage storage battery on the traditional automobile, and finally, the inconsistency of the battery pack is well improved.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a balanced control circuit of group battery based on battery module, includes the battery module, uses electrical apparatus, battery package and equalizer plate, characterized by: the battery module is connected with the electrical apparatus and is supplied power for electrical apparatus, and the battery module is connected the battery package and is carried out charge-discharge equilibrium to the group battery that needs the equilibrium in the battery package, and the battery package makes the electric quantity of battery module stable at reasonable interval all the time for the power supply of battery module, sets up the equalizer plate between battery module and battery package and carries out signal transmission, and the equalizer plate is arranged in gathering each group battery in the battery package, the information of battery module, judges whether each group battery needs the equilibrium and whether the battery module needs to charge and form group battery equalization control circuit based on battery module.
2. The battery pack balancing control circuit based on the battery module as set forth in claim 1, wherein: after the battery module is started through Q1, the battery module is in charge of supplying power to an electric appliance after being reduced in voltage through low-voltage DC/DC.
3. The battery pack balancing control circuit based on the battery module as set forth in claim 1, wherein: the battery module acquires the state information of the battery packs in the battery pack through the balancing board, judges balancing conditions, starts Q3, and starts balancing each battery pack after boosting through low-voltage DC/DC.
4. The battery pack balancing control circuit based on the battery module as set forth in claim 1, wherein: the battery pack is composed of a plurality of battery packs, the plurality of battery packs are connected in series, and each battery pack is connected with the low-voltage DC/DC through an MOSFET.
5. The battery pack balancing control circuit based on the battery module as set forth in claim 4, wherein: and the battery packs charge the battery module through the opening of Q2 by high-voltage DC/DC.
6. The battery pack balancing control circuit based on the battery module as set forth in claim 4, wherein: each battery pack is connected by a plurality of single batteries, and each single battery is connected with each other after passing through low-voltage DC/DC through a diode and an MOSFET respectively.
7. The battery pack balancing control circuit based on the battery module as claimed in claim 6, wherein: and the on-off of the MOSFET is responsible for the balance of each single battery.
8. The battery pack balancing control circuit based on the battery module as claimed in claim 6, wherein: the diode is responsible for rectification.
9. The battery pack balancing control circuit based on the battery module as set forth in claim 1, wherein: the electrical appliance is used for enabling each system to normally operate.
10. The method of any one of claims 1 to 9, wherein the method comprises the following steps: the method specifically comprises the following steps:
firstly, after a main switch is switched on, a battery module starts to work, power is supplied to an electric appliance after voltage reduction, and each system of a vehicle starts to operate after error-free detection;
secondly, when each system of the vehicle starts to work, the balancing board starts to acquire relevant information of the battery pack and the battery module, and judges whether each battery pack needs to be balanced and whether the battery module needs to be charged;
thirdly, after receiving the signal of the equalizing plate, the battery module carries out charging and discharging on each battery pack so as to achieve the equalizing purpose of the battery packs;
fourthly, all the single batteries are connected inside the battery pack and balanced through an energy conversion balancing circuit;
fifthly, in the equalizing process, the equalizing plate monitors the electric quantity of the battery module, and the whole battery pack is responsible for charging the battery module, so that the electric quantity of the battery module is always stable in a reasonable interval, and the whole system can stably operate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110366342.5A CN112838653A (en) | 2021-04-06 | 2021-04-06 | Battery pack balance control circuit and method based on battery module |
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| CN202110366342.5A CN112838653A (en) | 2021-04-06 | 2021-04-06 | Battery pack balance control circuit and method based on battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113650527A (en) * | 2021-08-26 | 2021-11-16 | 东风柳州汽车有限公司 | Power battery voltage balancing method, device, equipment and storage medium |
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