JP3175574U - Discharge-type battery management device - Google Patents

Abstract

Disclosed is a discharge-type battery management device that discharges at least one high-potential battery cell at the same time and equalizes the potential of each battery cell.
A plurality of battery cells are monitored by a monitor module, and when a potential, current and temperature of any of the battery cells change, a plurality of isolated energy storage modules are controlled by a control module, and a battery pack is installed. While charging, at least one battery cell having a relatively high potential is discharged to equalize the potential of the entire battery pack, thereby improving the energy conversion efficiency of the apparatus.
[Selection] Figure 2

Description

  The present invention relates to an electric energy conversion adjustment circuit technology, and in particular, controls a discharge switch by a control module and simultaneously discharges at least one high-potential battery cell through an independent energy storage module, thereby controlling the potential of each battery cell. The present invention relates to a discharge-type battery management device for equalization.

Currently, green traffic appliances such as electric vehicles and hybrid cars are used in large quantities as kinetic energy battery packs that can repeatedly charge and discharge lithium ion batteries. Furthermore, since one lithium ion battery cell generally has a voltage as low as 3 to 4 volts, it does not reach the driving voltage of 100 volts or more required for an electric vehicle or a hybrid car. Therefore, it is necessary to finish the battery pack that supplies kinetic energy by connecting a plurality of lithium ion battery cells in series.
However, from a common sense, each battery cell originally has a subtle difference in characteristics. For example, in addition to the difference in internal resistance, the electrical energy that can be stored and output at the time of charging / discharging is different, and then after repeated charging / discharging multiple times, a potential difference is formed in each battery cell, and the voltage of each battery cell is Electrical energy performance and efficiency are reduced, causing imbalances. If the potential of the battery cell is too high, the deterioration of electricity is accelerated or burned out. Conversely, when the potential is too low, the battery cell may deteriorate and be damaged.

Alternatively, excess electrical energy of the battery cell can be output to another battery cell by a conversion device such as an inductor or a transformer. Reference is made to the electrical circuit diagram of the prior art main battery leveling device of FIG. As shown in the figure, the battery management device 1 is independent of the charge / discharge circuit of the battery pack 2. A transformer 10 is used as an energy conversion element. The primary side is connected in series to the first switch 11 and then coupled to the control module 12. The secondary side is coupled to a plurality of battery cells 20 via a plurality of second switches 13. Further, the second switch 13 is controlled by the control module 12. An abnormality in the potential, voltage or temperature of one of the battery cells 20 is detected by the detection module 14, and when adjustment is required, the first switch 11 is turned on by the control module 12 to transform the electric energy of the battery pack 2. After the conduction cycle has passed, the control module 12 turns off the first switch 11 and simultaneously turns on the corresponding second switch 13 with the battery cell 20 having a relatively low potential, Electrical energy is stored and placed through the secondary side of the transformer 10 to equalize the potential of each battery cell 20.
From the above description, although the above-described method can equalize the potentials of the battery cells 20, the switch attached to the charging circuit is complicated and the cost of the electric circuit is increased. Further, in this means, after discharging the entire battery pack 2, electric energy is transmitted to the battery cell 20 having a low potential. Therefore, if there is a battery cell 20 that needs to be adjusted, all the battery cells 20 need to be discharged, reducing the charging efficiency and accelerating the deterioration of the battery.

  In order to solve the above-mentioned problem, the known technique equalizes the potential of each battery cell by consuming excess electrical energy in a system in which a bypass resistor is connected in parallel to a battery cell having high electrical energy. However, this type of battery equalization by passive type consumes electricity to form heat, so the temperature rise of the battery cell shortens the lifetime, lowers the energy conversion efficiency and expands. difficult.

  Regarding the problems of the known technology, the object of the present invention is to provide a discharge-type battery management device. The monitor module monitors the potential, current, and temperature of the plurality of battery cells, and the monitor module verifies the balance state of the battery cell potential. Among these, when at least one battery cell is at a relatively high potential, a discharge signal is output from the monitor module to the control module. When the control module receives the charging signal, the corresponding first switch is immediately turned on, and the corresponding battery cell is charged, and at the same time, the electric energy is discharged from the second coil of the corresponding energy storage module. Due to the mutual inductive action between the second coil and the corresponding first coil, the emitted electrical energy is transmitted to the corresponding first coil, stored in the corresponding energy storage module, and fed back to the system. In this way, the battery cells are discharged simultaneously or independently through the isolated energy storage module to equalize the potential of each battery cell, thereby improving the conversion efficiency of the battery pack and delaying the deterioration of the battery cells. Effect can be achieved.

  Furthermore, in order to avoid damage to the battery pack due to overcharging, the battery management device of the present invention detects an excessive charging current of the battery pack or electrical energy saturation from the monitor module and outputs a power failure signal to the control module. Then, the second switch coupled between the power source, the control module, and the energy storage module is turned off via the control module, and the supply of the power source is stopped.

In order to avoid the deterioration of the battery cell due to overdischarge of the battery cell, the discharge type battery management device of the present invention detects that the potential of the battery cell is too low and outputs an abnormal signal to the control module for control. The module stops discharging the battery pack via the discharge suppression module.
Furthermore, in order to improve the electrical storage efficiency of the battery pack, each first coil is coupled to a synchronous rectifier through a third switch so that the energy storage module synchronizes and rectifies the current and voltage, and then the battery cell. To charge.

It is an electric circuit diagram of the main-acting type battery potential equalization device of the known technology. 1 is a block diagram of a preferred embodiment 1 of the present invention. It is an electric circuit aspect | mode figure of preferable Example 1 of this invention. It is the electric circuit mode figure of preferable Example 2 of this invention.

  In order to further understand the content of the present invention, the following description is combined with a diagram for explanation.

  2 to 4, a block diagram of a first preferred embodiment of the present invention, an electric circuit diagram of the first embodiment, and an electric circuit diagram of the second embodiment will be referred to. As shown in the figure, the discharge-type battery management device 3 that charges and monitors the plurality of battery cells 40 of the battery pack 4 includes a plurality of energy storage modules 30, one monitor module 31, a control module 32, a second A switch 33 and a discharge suppression module 34 are provided. The energy storage module 30 includes a first coil 301, a magnetic core 302, and a second coil 303. Each first coil 301 is coupled to the second coil 303 via the magnetic core 302, and each second coil 303 is coupled to the battery cell 40 via the first switch 304. The monitor module 31 is connected to the battery cell 40 and the control module 32. The control module 32 is coupled to the first switch 304 and is normally placed in a standby state to save power consumption during standby, and is activated only when the monitor module 31 detects an abnormality and outputs a signal. The second switch 33 is coupled between the power source, the energy storage module 30, and the control module 32, and the discharge suppression module 34 is coupled to the control module 32 and the battery pack 4.

The control module 32 monitors the potential, current, and temperature of the battery cell 40, and the battery cell 40 is not too hot, current is not too high, or the potential is not too low, or a discharge current can be output. To detect. If it is in the conforming value, the discharge function of the battery cell 40 is activated by the control module 32, and if not, the discharge function is stopped. Subsequently, when the charging current of the battery pack 4 is too large or the temperature is too high, the monitor module 31 checks whether the potential state of the battery pack 40 is saturated.
When the electrical energy stored in one of the battery cells _{40_1} exceeds a maximum electrical energy value, for example, 3.65 volts, an electrical pause signal and a discharge signal are output to the control module 32. 2 The switch 33 is turned off to prevent overcharging or burning of the battery pack 4 due to an abnormal error at the input end. At the same time, the first switch _{304_1} is turned on by the control module 32, the corresponding battery cell _{40_1} is charged, and at the same time, excess electric energy is output to the corresponding second coil _{303_1} , and the second coil 303 and the first coil 301 are output. The released electrical energy is transmitted to the corresponding first coil _{301_1} by the mutual induction action, and temporarily stored in the corresponding energy storage module _{30_1} and fed back to the system. It should be noted that the second switch 33 uses an electronic switch that can withstand low power consumption and an abnormal operating current of 200 amperes. And the total electricity consumption at full load is 50 watts or less, contributing to power saving and meeting environmental protection requirements.

On the other hand, when there is no battery cell 40 exceeding 3.65 volts, the monitor module 31 further confirms whether the potential error of each battery cell 40 is smaller than a predetermined error value, for example, 0.05 volts. If so, it is confirmed again that the battery cell 40 is being charged or discharged, and monitoring of the battery cell 40 is continued or the monitoring operation is terminated and a standby state is entered. If the potential difference between the battery cells 40 exceeds plus or minus 0.05 volts, a discharge signal is transmitted to the control module 32 to activate the corresponding first switches _{304_2} and _{304_n} , and the battery pack 4 potential average two battery cells 40 _{_2} exceeding, 40 _{_n} the corresponding two coils 303 _{_2,} after releasing the 303 _{_n,} two first coil 301 _{_2} corresponding via 301 _{_n,} released Place temporarily store electrical energy to the corresponding two energy storage module 30_ _2, 30 _{_n,} is fed back into the system. Thus, there is no waste of electric energy, and the potential between the battery cells 40 can be quickly equalized, the charging efficiency of the battery pack 4 is improved. In the case of a large current, for example, the battery cells 40 are connected in series to 384 volts. And the equalization system of the main potential of the charging / discharging installation of the high voltage battery pack 4 is formed.

  Further, when the monitor module 31 detects that the potential of the battery cell 40 is too low, an abnormal signal is output to the control module 32, and the control module 32 discharges the battery pack 4 via the discharge suppression module 34. Stop and avoid deterioration and damage due to excessive discharge of battery cells 40. Thus, the discharge-type battery management device 3 can provide complete protection to the battery pack 4 by the monitor module 31, the second switch 33, and the discharge suppression module 34.

  Furthermore, each 1st coil 301 can adjust a charging period simultaneously with filtering and rectification of charging current, for example by using a diode as an asynchronous rectifier. Alternatively, after each second coil 301 is connected in series to the third switch 305 of the metal oxide semiconductor field effect transistor and then coupled to the synchronous rectifier 35, when the third switch 301 is turned on, the energy storage module 30 After the power supply voltage is rectified synchronously, the battery cell 40 is charged, and the conversion efficiency of electric energy can be improved to 70% or more.

1: Battery management device 10: Transformer 11: Switch 12: Control module 13: Second switch 14: Detection module 2: Battery pack 20: Battery cell 3: Dischargeable battery management device 30: Energy storage module 301: First Coil 302: Magnetic core 303: Second coil 304: First switch 305: Third switch 31: Monitor module 32: Control module 33: Second switch 34: Discharge suppression module 35: Synchronous rectifier 4: Battery pack 40: Battery cell

Claims (5)

A discharge-type battery management device that monitors charging of a plurality of battery cells provided in a battery pack using a power source and equalizes the amount of electrical energy stored in each of the battery cells by an independent charging method,
The first coil is coupled to the power source and the battery pack, and includes a first coil, a magnetic core, and a second coil. Each of the first coils is coupled to the second coil via the magnetic core, and the second coil A plurality of energy storage modules connected in series to the battery cells via a first switch;
A plurality of the battery cells are electrically connected, and the potential, current and temperature of the battery cells are monitored, and the equalization state of the potentials of the battery cells is checked, and at least one of the battery cells has a low potential. A monitor module that sometimes outputs a discharge signal,
Coupled to the energy storage module and the monitor module, receiving a discharge signal, and conducting a corresponding first switch, so that a corresponding battery cell is charged and simultaneously discharges electric energy to a corresponding second coil; A control module for transmitting the released electrical energy to the corresponding first coil by the mutual induction action of the second coil and the first coil, and then storing it in the corresponding energy storage module and feeding it back to the system; Prepare
Discharge type battery management device.   The monitor module further includes a power switch, the energy storage module, and a second switch coupled to the control module, so that the charging current of the battery pack is too large or the potential has reached saturation or the temperature is high. 2. The discharge according to claim 1, wherein when it is detected that electric power is too high, an electric sleep signal is output to the control module, and the second switch is turned off and the power supply is stopped by the control module. Type battery management device.   The battery module further includes a discharge suppression module coupled to the control module, and outputs an abnormal signal to the control module when the monitor module detects that the potential state of the battery cell is too low. 2. The discharge type battery management apparatus according to claim 1, wherein the control module stops the discharge to the battery pack via the discharge suppression module.   2. The battery according to claim 1, wherein the first coil is coupled to a synchronous rectifier through a third switch so that the energy storage module can synchronously rectify current and voltage and charge the battery cell. Discharge type battery management device.   2. The discharge-type battery management apparatus according to claim 1, wherein each of the second coils is connected to a diode, rectifies the first current in an asynchronous manner, and charges the battery cell.

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