TWI572113B - Use the battery module charging method of the fully charged device - Google Patents

Description

Battery module charging method using the equalizer

The invention relates to a charging method of a battery module using a homogenizer, in particular to a method capable of uniformly charging the battery cells in the battery module to improve the use efficiency and prolonging the service life of the battery module.

The Battery Management System (BMS) is an essential core system for electric vehicles. It is responsible for the safety monitoring and management of battery modules to improve the efficiency and reliability of battery modules and extend battery modules. The service life. The battery management system mainly includes a battery management unit (BMU) and a battery control unit (BCU). The battery module management unit (BMU) can transmit relevant information through various communication protocols and transmit information to the battery module control unit (BCU) to manage, alert and secure the battery module.

When the electric vehicle is started and the battery modules connected in series are repeatedly charged and discharged, the voltage difference and the capacity unevenness between the battery cores may occur, which may make the use efficiency of the battery module worse, and may also cause the battery. The life of the module is attenuated. In addition to monitoring the state of the battery cells, the Battery Management Unit (BMU) can also perform active or passive battery balancing to compensate for slight cell mismatches to extend the life of the battery module.

The balance control circuit of the battery module management unit (BMU) is mainly divided into passive balance and active balance. Among them, passive balance is the energy of the battery with higher voltage Work directly on the load resistor to convert excess energy into heat. This method is only suitable for suppressing the voltage rise of the strongest battery core in the charging mode to limit power loss. For a combination of a plurality of battery modules, when one of the battery cells is fully charged, the system will display that the charging is completed, but in reality, there may still be multiple battery cells in a state of insufficient power, therefore, To make the battery cells charge on average, it consumes a lot of energy.

The active balance system transfers the excess energy of a plurality of higher voltage battery cells one by one to other battery cores with lower voltages. However, when adjusting the charge amount of each battery cell with multiple switching circuits, too many switches will reduce the reliability. If the switch produces a short circuit, it will cause the battery core to be overcharged and even burned. Therefore, the above two battery balancing management modes have room for improvement in terms of balance efficiency, manufacturing cost, and reliability.

In view of the above, in order to provide a structure different from the conventional technology and to improve the above disadvantages, the inventors have accumulated many years of experience and continuous development and improvement, and the present invention has been produced.

The main object of the present invention is to provide a battery charger for charging at least one battery module with a charger, and monitoring battery power in each battery module through a battery monitoring unit, and then performing charging on the battery core with a low battery capacity. The charging equalizer and the charging method of the battery module using the equalizing device can solve the problem that the conventional battery module needs to be equipped with an active or passive battery balancing circuit to increase the manufacturing cost, the balance efficiency cannot be effectively achieved, and the safety reliability is insufficient. The problem is to effectively improve the balance efficiency to extend the service life, reduce costs, and ensure safe use.

In order to achieve the above purpose, the equalizer of the present invention is configured to connect at least one battery module, the battery module has a plurality of battery cells, and the equalizer includes a plurality of charging units and Several battery monitoring units. Wherein, the plurality of charging units are electrically connected to the plurality of battery cells; and the plurality of battery monitoring units are electrically connected to the plurality of battery cells to separately monitor the power of each battery cell, and the plurality of battery monitoring units respectively It is electrically connected to a plurality of charging units, thereby controlling a plurality of charging units, and respectively charging the corresponding battery cells.

In implementation, the invention further includes a housing, the plurality of charging units and the plurality of battery monitoring units being housed in the housing.

In implementation, the plurality of charging units are connected in series with each other.

In implementation, the present invention further includes a first-time control unit that connects the plurality of charging units to equalize the voltage of the average plurality of charging units.

The charging method of the battery module provided by the present invention comprises the following steps: a. serially charging at least one battery module with a charger, so that the power of at least one battery core in the battery module reaches one a preset standard value; b. connecting the equalizer and the battery module, respectively monitoring the power of the plurality of battery cells by a plurality of battery monitoring units; and c. the plurality of battery monitoring units respectively controlling according to the different amounts of the batteries A plurality of charging units are respectively charged for the respective battery cells.

In implementation, the preset standard value of step a is the state in which the battery core is fully charged.

In implementation, the plurality of charging units of step c are respectively charged for respective battery cells corresponding to the preset standard values.

In implementation, the plurality of charging units are connected in series with each other. And the invention further comprises a step of connecting the plurality of charging units with the equalization control unit to equalize the voltage of the average plurality of charging units.

In order to further understand the present invention, the following preferred embodiments, with the drawings and figures The specific constitution of the present invention and the effects achieved by the present invention are described in detail below.

1‧‧‧Finer

2‧‧‧Shell

21‧‧‧First connection

3‧‧‧Charging unit

4‧‧‧Issue control unit

5‧‧‧Battery monitoring unit

51‧‧‧Monitoring unit

52‧‧‧Control unit

6‧‧‧ battery module

61‧‧‧second connection

62‧‧‧ battery core

7‧‧‧ cable

8‧‧‧Charger

1 is a perspective view of a preferred embodiment of a battery charger module according to a preferred embodiment of the present invention.

2 is a block diagram showing a circuit of a preferred embodiment of the battery charger module of the present invention.

Fig. 3 is a block diagram showing the circuit connection of the charging method of the battery module using the equalizer of the present invention.

The invention relates to a battery module charging method using a homogenizer, wherein the equalizer is used for connecting at least one battery module, and the battery module has a plurality of battery cells arranged side by side.

Referring to Figures 1 and 2, a preferred embodiment of the equalizer 1 of the present invention includes a housing 2, a plurality of charging units 3, an equalization control unit 4, and a plurality of battery monitoring units 5. The housing 2 has a rectangular parallelepiped shape and has a receiving space therein for accommodating and positioning a plurality of charging units 3, a plurality of battery monitoring units 4 and an equalization control unit 5. A first connecting end 21 is provided on one side of the housing 2. A second connecting end 61 is disposed on one side of the battery module 6, and is connected through the joints at both ends of the cable 7. The equalizer 1 is electrically connected to the battery module 6.

A plurality of charging units 3 are connected in series with each other, and a plurality of charging units 3 are connected to the equalization control unit 4, and the voltage of the average plurality of charging units 3 is equalized by equalizing the control unit 4. The positive and negative poles of the plurality of charging units 3 are concentrated on the first connecting end 21 of the casing 2, and the plurality of charging units 3 are respectively connected to the plurality of battery cells 62 in the battery module 6 via the connection of the cable 7. Electrically connected and The positive and negative poles of one charging unit 3 are connected to the positive and negative poles of one battery core 62.

The battery monitoring unit 5 has a monitoring unit 51 and a control unit 52. One of the battery monitoring units 5 of the plurality of battery monitoring units 5 corresponds to one of the plurality of battery cells 62. The plurality of battery monitoring units 5 are electrically connected to the plurality of battery cells 62 for respectively monitoring the power of each of the corresponding battery cells 62. The plurality of control units 52 are electrically connected to the plurality of charging units 3, respectively, to control the plurality of charging units 3 to charge the corresponding battery cells 62, respectively.

In implementation, the battery module charging method using the above-described equalizer 1 includes the following steps:

As shown in FIG. 3, the battery module 6 is serially charged by the charger 8 so that the amount of power of at least one of the battery cells 62 in the battery module 6 reaches a predetermined standard value.

b. Connect the equalizer 4 and the battery module 6, and monitor the power of the plurality of battery cells 62 by the monitoring unit 51 of the plurality of battery monitoring units 5. as well as

c. The control unit 52 of the plurality of battery monitoring units 5 respectively controls the plurality of charging units 3 according to the different amounts of the respective battery cells 62 to charge the corresponding battery cells 62 respectively.

The battery module 6 of the step a may also be set to be multiple. The power of the battery core 62 in the battery module 6 may be one to reach a preset standard value, or two or more may reach a preset standard value at the same time. The preset standard value is a state in which the battery core 62 is fully charged. In step b, the homogenizer 4 and the battery module 6 are preferably connected by a cable 7. The plurality of charging units 3 of step c are respectively charged for the respective battery cells 62 corresponding to the preset standard values. And after step c, further comprising a step of connecting the plurality of series connected charging units 3 with the equalization control unit 4, The voltage of the average plurality of charging units 3 is equalized so that the amount of charge of the plurality of separately charged charging units 3 does not vary greatly.

Therefore, the present invention has the following advantages:

1. The present invention uses a charger to serially charge a battery module, and monitors the power of the battery cells in each battery module through a battery monitoring unit, and then separately charges the battery cells that are too low in power by the charging unit, therefore, Not only can it effectively improve the balance efficiency to prolong the service life of the battery module, but also reduce the production cost and ensure the safety of the use because the battery module does not need to be equipped with active or passive battery balancing circuits.

2. In the present invention, a plurality of charging cells are individually charged for a plurality of battery cells whose electric quantity is too low, and the voltage of the average plurality of charging units is equalized by the equalization control unit, thereby effectively improving the charging efficiency and the charging unit. The service life.

In summary, according to the above disclosure, the present invention can achieve the intended purpose, and provide a not only effective improvement of the balance efficiency to prolong the service life of the battery module and the charging unit, but also reduce the production cost and ensure The use of a safe charging method using the battery module of the equalizer is extremely valuable for industrial use, and the invention patent application is filed according to law.

1‧‧‧Finer

2‧‧‧Shell

3‧‧‧Charging unit

4‧‧‧Issue control unit

5‧‧‧Battery monitoring unit

51‧‧‧Monitoring unit

52‧‧‧Control unit

6‧‧‧ battery module

62‧‧‧ battery core

8‧‧‧Charger

Claims (4)

A battery module charging method using a leveling device for connecting at least one battery module, the battery module having a plurality of battery cells, the equalizer comprising a plurality of charging units and a plurality of battery monitoring units The plurality of charging units are electrically connected to the plurality of battery cells; the plurality of battery monitoring units are electrically connected to the plurality of battery cells for separately monitoring the power of each battery cell, and the plurality of battery cells are monitored The unit is electrically connected to the plurality of charging units respectively, thereby controlling the plurality of charging units to respectively charge the corresponding battery cells, and the battery module charging method comprises the following steps: a. using a charger Performing a series charging on at least one battery module, so that the power of at least one battery core in the battery module reaches a preset standard value, wherein the preset standard value is a state in which the battery core is fully charged; b. The equalizer and the battery module respectively monitor the power of the plurality of battery cells by the plurality of battery monitoring units; and c. the plurality of battery monitoring units are respectively based on the respective batteries The amount different cores, respectively controlling the plurality of charging units that were charged for each of the corresponding battery cell. The battery module charging method using the equalizer according to the first aspect of the invention, wherein the plurality of charging units of the step c are respectively performed for the respective battery cells corresponding to the preset standard value. Charging. The battery module charging method using the equalizer according to the first aspect of the invention, wherein the plurality of charging units are connected in series with each other. The battery module charging method using the equalizer according to claim 3, further comprising a step of connecting the plurality of charging units with a first-time control unit for equalizing the average The voltage of a plurality of charging units.