CN215528665U

CN215528665U - Active equalization management system

Info

Publication number: CN215528665U
Application number: CN202122051466.2U
Authority: CN
Inventors: 吴传靖; 李志强; 段文星
Original assignee: Hangzhou Xieneng Technology Co ltd
Current assignee: Hangzhou Xieneng Technology Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-01-14
Anticipated expiration: 2031-08-27

Abstract

The utility model provides an active equalization management system, which is used for a battery module with n strings of single batteries and comprises a main controller and a data acquisition module in communication connection with the main controller, wherein the data acquisition module is connected with the battery module, acquires the voltage of the single batteries and transmits the voltage to the main controller; still include n-1 initiative equalizing module, every initiative equalizing module is connected in adjacent two between the battery cell, establish ties between n-1 initiative equalizing module, every initiative equalizing module, the parallel connection has m initiative equalizing module, every initiative equalizing module with main control unit is connected, works as main control unit detects voltage difference between the battery cell, main control unit control corresponding initiative equalizing module starts to adjust the electric quantity of each battery cell in the battery module. The utility model can be suitable for battery modules with various capacities and has high balancing efficiency.

Description

Active equalization management system

Technical Field

The utility model relates to the field of battery management, in particular to an active equalization management system.

Background

In the existing market, the internal resistance, the nominal capacity and the aging coefficient of each single battery are different, one battery module in a group has differences among the single batteries, and along with the increase of the charging and discharging cycle times of the battery module, the consistency difference among the single batteries is larger and larger, so that the charging and discharging capacity of the whole battery module is smaller and smaller, and the service performance and the service life of the battery module are seriously influenced. Therefore, an active equalization system is configured for the battery module to improve the consistency of the battery module, improve the charge and discharge performance of the battery module and prolong the service life of the battery module.

The current active equalization scheme is that a bidirectional DC/DC is connected to the outside, a switch electronic array is adopted in the inside, and energy transfer from a high-energy battery to a low-energy battery is carried out by controlling the switch electronic array. According to the scheme, only one string of batteries can be balanced at the same moment, the balancing efficiency is low, the maximum balancing current is generally 5A, the balancing method is suitable for balancing middle and small-capacity battery modules within 700AH, the balancing efficiency and the reliability of the large-capacity battery modules above 700AH are reduced, and if the balancing current is required to be large, the size of a switching power supply is correspondingly large, and the space is occupied.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an active balancing management system, which is suitable for battery modules with various capacities and has high balancing efficiency.

In order to achieve the above object, the present invention provides an active equalization management system for a battery module having n strings of single batteries, including a main controller and a data acquisition module in communication connection with the main controller, wherein the data acquisition module is connected with the battery module, and acquires voltages of the single batteries, and transmits the voltages to the main controller; still include n-1 initiative equalizing module, every initiative equalizing module is connected in adjacent two between the battery cell, establish ties between n-1 initiative equalizing module, n is >1 natural integer, every initiative equalizing module has m initiative equalizing module in parallel, equalizing module is used for the battery balanced, every initiative equalizing module with main control unit connects, m is >1 natural integer, works as main control unit detects voltage difference between the battery cell, main control unit controls corresponding initiative equalizing module and starts, in order to adjust each battery cell's electric quantity in the battery module.

Optionally, the data acquisition module is an analog front-end chip, and the voltage and the temperature of the single battery are acquired by the analog front-end chip and transmitted to the main controller.

Optionally, a balance switch is arranged in the active balance module, and the main controller starts the balance by controlling the balance switch to be closed.

Optionally, the active equalization modules in two adjacent active equalization modules are connected in series in a one-to-one correspondence manner.

Optionally, the active balancing module includes a voltage collector and an internal controller, the voltage collector collects voltages of two adjacent single batteries and feeds the voltages back to the internal controller, and the internal controller compares the collected voltages and controls the balance switch to be closed, so that electric quantity is transferred from a battery with high voltage to a battery with low voltage.

Optionally, the equalization current of the active equalization module is less than or equal to 3A.

Optionally, the analog front-end chip is in communication connection with the main controller through an SPI serial port.

Optionally, m is a natural integer less than or equal to 5.

Optionally, the active equalization module is an active equalization chip, and the electric quantity of each single battery is equalized through the active equalization chip.

Compared with the prior art, the technical scheme of the utility model has the following advantages: according to the capacity of the battery module, the active equalization modules with different numbers are connected in parallel to actively equalize the battery module. The utility model can be suitable for battery modules with various capacities, and has the advantages of high balancing efficiency, high reliability and small volume.

Drawings

FIG. 1 is a diagram of an embodiment of an active equalization management system according to the present invention;

fig. 2 is a schematic diagram of a second embodiment of the active equalization management system according to the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The utility model is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the utility model.

In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

The utility model is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.

Referring to fig. 1, which is a schematic diagram of an active equalization management system according to a first embodiment of the present invention, the active equalization management system is used for a battery module 2 having n strings of single batteries, and includes a Main Controller (MCU)1 and a data acquisition module in communication connection with the Main Controller (MCU)1, where the data acquisition module is connected to the battery module 2, acquires voltages of the single batteries, and transmits the voltages to the Main Controller (MCU) 1; the battery pack is characterized by further comprising n-1 active equalization modules, each active equalization module is connected between two adjacent single batteries, the n-1 active equalization modules are connected in series, each active equalization module is connected with m active equalization modules 3 in parallel, the equalization modules 3 are used for battery equalization, each active equalization module 3 is connected with a Main Controller (MCU)1, when the Main Controller (MCU)1 detects that the voltages between the single batteries are different, the Main Controller (MCU)1 outputs a high-level signal to control the corresponding active equalization modules 3 to start, and the electric quantity in the high-capacity battery is transferred to the low-capacity battery in a switching power supply mode through a circuit connected in series between the active equalization modules, so that the electric quantity of each single battery in the battery module is adjusted.

The active equalization modules have specific equalization current, the equalization current is increased or decreased by increasing or decreasing the number of the active equalization modules connected in parallel, so that the battery modules with different capacities can be actively equalized, and the main controller can control a plurality of active equalization modules to be started simultaneously to equalize different batteries simultaneously.

Specifically, the data acquisition module is an analog front end chip (AFE)4, is used for acquiring the voltage of each single battery, and is also used for acquiring the temperature of each single battery, and transmitting the temperature to the Main Controller (MCU)1, so that the management performance of the Main Controller (MCU)1 on the battery module is improved, and the volume of the whole battery management system is reduced.

Specifically, a balance switch is arranged in the active balance module, and the main controller starts balance by controlling the balance switch to be closed.

As shown in fig. 1, the battery module 2 has 12 strings of single batteries including BAT1-BAT12, 2 active balancing modules 3 are connected in parallel between two adjacent strings of single batteries, the analog front end chip (AFE)4 collects the voltages of the 12 strings of single batteries and transmits the voltages to the Main Controller (MCU)1, the Main Controller (MCU)1 finds the imbalance of the capacities of the single batteries through detection and comparison, for example, finds that the capacity of the BAT2 battery is the highest and the capacity of the BAT6 battery is the lowest, so that all the active balancing modules 3 between BAT2 and BAT6 are started, that is, 2-1#, 2-2#, 3-1#, 3-2#, 4-1#, 4-2#, 5-1#, and 5-2# in the active equalization module 3 are all started, the equalization switches of the active equalization modules 3 are closed, and the electric quantity of the BAT2 battery is transferred to the BAT6 battery.

Specifically, the active equalization modules in two adjacent active equalization modules are connected in series in a one-to-one correspondence manner. As shown in fig. 1, 11 active equalization modules 3 among 1-1#, 2-1#, 3-1#. and 11 active equalization modules 3 among 11-1# are connected in series, and 1-2#, 2-2#, 3-2#. and 11 active equalization modules 3 among 11-2# are connected in series, and the active equalization modules 3 are correspondingly connected in series one by one, so that the electric quantity transfer among the single batteries is convenient, and the electric quantity transfer can be performed even if other single batteries are also connected in series between the high-capacity battery and the low-capacity battery.

Specifically, the active equalization module 3 comprises a voltage collector and an internal controller, the voltage collector collects voltages of two adjacent single batteries and feeds the voltages back to the internal controller, and the internal controller compares the collected voltages and controls the equalization switch to be closed so as to transfer electric quantity from the high-voltage battery to the low-voltage battery. Under the condition that does not have Main Control Unit (MCU)1 control, initiative equalizer module 3 can carry out autonomous control, gather the voltage between two adjacent battery cells and compare, transfer the battery surplus electric quantity that the capacity state is high to the battery that the capacity state is low, improve balanced efficiency, realize battery module capacity maximize to extension battery cycle life.

Specifically, the electric quantity transferred by the active equalization module 3 is less than or equal to 3A. In this embodiment, the maximum equalization current of the active equalization module 3 is 3A, as shown in fig. 1, two active equalization modules 3 are connected in parallel in the active equalization module, and the maximum equalization current is 6A, so that the active equalization module is suitable for performing active equalization on a battery module with a capacity within 800 AH.

Specifically, the analog front end chip (AFE)4 is in communication connection with the Main Controller (MCU)1 through the SPI serial port, so that the acquired data information is transmitted to the main controller.

Specifically, m is a natural integer less than or equal to 5.

Fig. 2 is a schematic diagram of a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the number of active equalization modules 3 connected in parallel in the active equalization modules is different, in the second embodiment, five active equalization modules 3 are connected in parallel in each active equalization module, and 11 active equalization modules 3 between # 1-1 and # 11-1 are connected in series, 11 active equalization modules 3 between # 1-2 and # 11-2 are connected in series, 11 active equalization modules 3 between # 1-3 and # 11-3 are connected in series, 11 active equalization modules 3 between # 1-4 and # 11-4 are connected in series, 11 active equalization modules 3 between # 1-5 and # 11-5 are connected in series, when the electric quantity of the battery with high capacity needs to be transferred to the battery with low capacity, all the active equalization modules 3 between the two single batteries are started, and the battery module is suitable for a high-capacity battery module of 1600 AH-2000 AH.

In some embodiments, three active equalization modules 3 are connected in parallel in the active equalization module, and the maximum equalization current is 9A, which is suitable for performing active equalization by using battery modules with the capacity of 800-1200 AH.

In some embodiments, the active equalization module 3 is an active equalization chip, and the electric quantity of each battery cell is equalized through the active equalization chip. The active equalization module 3 is made into a chip form, so that the volume of the whole system is further reduced, the stability of quality can be ensured through batch production, and the reliability is high.

In the above embodiments, the data such as the number of active equalization modules connected in parallel, the magnitude of equalization current, and the capacity of the applicable battery module are determined according to the performance of the specification parameters of the active equalization modules, the performance of the active equalization modules with different specification parameters is different, the equalization current is also different, and the capacity of the applicable battery module is also different, which should not be construed that the present invention is limited to only the data mentioned in the above embodiments.

Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. An active equalization management system is used for a battery module with n strings of single batteries and comprises a main controller and a data acquisition module in communication connection with the main controller, wherein the data acquisition module is connected with the battery module, acquires the voltage of the single batteries and transmits the voltage to the main controller; the method is characterized in that:

the cell balancing device also comprises n-1 active balancing modules, each active balancing module is connected between two adjacent single cells, the n-1 active balancing modules are connected in series, n is a natural integer greater than 1,

each active equalization module is connected with m active equalization modules in parallel, the equalization modules are used for equalizing the batteries, each active equalization module is connected with the main controller, m is a natural integer greater than 1,

when the main controller detects that the voltages of the single batteries are different, the main controller controls the corresponding active equalization module to start so as to adjust the electric quantity of each single battery in the battery module.

2. The active equalization management system of claim 1 wherein: the data acquisition module is an analog front-end chip, and the voltage and the temperature of the single battery are acquired through the analog front-end chip and transmitted to the main controller.

3. The active equalization management system of claim 2 wherein: and a balance switch is arranged in the active balance module, and the main controller starts balance by controlling the balance switch to be closed.

4. The active equalization management system of claim 3 wherein: and the active equalization modules in the two adjacent active equalization modules are connected in series in a one-to-one correspondence manner.

5. The active equalization management system of claim 3 wherein: the active equalization module comprises a voltage collector and an internal controller, the voltage collector collects the voltages of two adjacent single batteries and feeds the voltages back to the internal controller, and the internal controller compares the collected voltages and controls the equalization switch to be closed so as to transfer the electric quantity from the high-voltage battery to the low-voltage battery.

6. The active equalization management system of claim 5 wherein: and the balance current of the active balance module is less than or equal to 3A.

7. The active equalization management system of any of claims 2-6, wherein: the simulation front-end chip is in communication connection with the main controller through the SPI serial port.

8. The active equalization management system of any of claims 1-6, wherein: and m is a natural integer less than or equal to 5.

9. The active equalization management system of any of claims 1-6, wherein: the active equalization module is an active equalization chip, and the electric quantity of each single battery is equalized through the active equalization chip.