TWI392188B - 2 times battery pack system - Google Patents

Description

2 battery system

The present invention relates to a system in which a plurality of battery packs can be connected in parallel in a secondary battery system that supplies electric power to an electronic device or the like.

In the prior art system in which the secondary battery packs can be used in parallel, a diode is used in each of the battery packs to prevent parallel connection in a countercurrent flow, and a control signal is sent from the main body side to discharge the battery pack one at a time.

For example, Patent Document 1 (Japanese Laid-Open Patent Publication No. 2004-229391) discloses a battery pack including: first and second battery blocks, which are connected in series to connect a plurality of secondary batteries; one of the battery terminals, One of the first and second battery blocks is connected via the first and second switching means, and the other one of the battery terminals is connected to the other of the first and second battery blocks; and the switching means is charging. Or switching the first and second switching means during discharge; the capacity detecting means for detecting the battery capacity of each of the first and second battery blocks; and switching control means for controlling the switching means according to the detected battery capacity When the first and second switching means are switched, after the predetermined time of one of the first and second switching means is turned OFF, the other one is turned ON.

Patent Document 1: Japanese Patent Laid-Open Publication No. 2004-229391

In a battery pack using a diode for preventing parallel connection in a reverse flow, power is consumed from a high-voltage battery pack, and finally all of the battery packs connected in parallel are simultaneously over-discharged, so one of them is taken out from the system at a time. In the case where the battery pack is used for charging, the charging timing is not easily understood as a problem.

Further, when the battery packs connected in parallel are controlled by the control signals on the main body side, in order to manage the remaining capacity of each of the battery packs, it is necessary to measure the voltage, current, and temperature of each of the battery packs, and to measure the information. The battery pack is sent to the main body side, and further determined based on the above-described measurement information to determine the battery pack to be discharged. In other words, it becomes a component or a sensor for measurement, a connector for communication, an IC chip, etc., and the system structure becomes complicated, which causes a problem of an increase in cost.

The present invention has been made to solve the above problems, and in order to solve the problems, the invention of claim 1 is a secondary battery system for supplying electric power to an electronic device, characterized by having a plurality of battery packs. Each has a control controller; a body side connection circuit connected to the plurality of battery packs on the electronic device side; and a body side discharge control signal line disposed on the body side connection circuit; and the body side discharge control signal line and The control controllers of the plurality of battery packs are connected.

In addition, the invention of claim 2 is in the secondary battery system of the first application of the patent scope, characterized in that the discharge control signal line of the control controller is mounted when the battery pack is mounted on the electronic device. Formed in connection with the body side discharge control signal line.

In addition, the invention of claim 3 is in the secondary battery system of claim 1 or 2, characterized in that the control controller is input with a battery connection signal useful for identifying the connection of the battery pack. .

In addition, the invention of claim 4 is in the secondary battery system of claim 3, characterized in that the discharge control signal input from the main body side discharge control signal line is boosted by the step-up resistor, and then The branch is branched into two branches, one branch of the two branches is input to the control controller via a resistor, and the other branch is directly input to the control controller.

In addition, the invention of claim 5 is in the secondary battery system of claim 4, characterized in that the main body side discharge control signal line is connected to the discharge of the plurality of battery packs in the body side connection circuit. The signal is controlled and boosted by a resistor, and the battery connection signal is connected to the GND terminal in the body side connection circuit.

In addition, the invention of claim 6 is in the secondary battery system of claim 5, characterized in that, when the battery is connected to the main body side connecting circuit, the position of the battery connection signal is used. The battery pack is identified by a quasi-change, and the voltage of the discharge control signal is read by the control controller in the battery pack to determine whether the discharge is permitted.

According to the secondary battery system of the embodiment of the present invention, since it is not necessary to measure the voltage, current, and temperature of each battery pack, the measurement information is transmitted to the main body side, and the determination is performed based on the respective measurement information, thereby determining Since the battery pack to be discharged can be controlled, it becomes unnecessary for measuring components, sensors, connectors for communication, IC chips, etc., so that the system configuration can be simplified and the cost can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic view showing a circuit configuration of one battery pack constituting a secondary battery system according to an embodiment of the present invention.

In Fig. 1, reference numeral 100 denotes a battery pack, 110 denotes a control controller, CL denotes a secondary battery unit, SW denotes a discharge switch, R1, R2, R3 denote resistors, and T1, T2, T3, T4 denote connection terminals, 200 Represents an electronic machine.

The power of the secondary battery unit CL charged in the battery pack 100 is supplied to the electronic device 200 via the discharge switch SW controlled by the control controller 110 to turn ON/OFF, particularly in the present invention. The use of the secondary battery system in parallel in parallel is targeted.

The control controller 110 configured by a microcomputer or the like has an N-ch drain open output port, an A/D conversion input port, and an input port, and performs discharge switch SW based on input from the ports or the like. It is ON/OFF and controls the power supply to the electronic device 200.

The N-ch drain open output port of the control controller 110 is used to output a signal indicating the state of discharge (switching) of its own battery pack.

Further, the A/D conversion input port of the control controller 110 has a function of taking in a signal indicating the state of discharge (switching) of its own battery pack at a constant cycle.

In addition, the function of the input port of the control controller 110 is to confirm the connection between the battery pack and the main body, and when the main port is not connected to the main body, the discharge switch is turned off, and the signal of the A/D conversion input port is further changed. The take-in cycle is slow or the controller's action is stopped. This function is used to suppress the power consumed inside the battery pack.

Four connection terminals T1 to T4 are provided in the battery pack 100, and the terminals are connected to the electronic device 200.

The connection terminal T1 is a power supply terminal (BATT+), the connection terminal T2 is a discharge control signal terminal, the connection terminal T3 is a battery connection signal terminal, and the connection terminal T4 is a ground terminal (GND).

The discharge control signal input from the connection terminal T2 is boosted by the resistor R2 in the battery pack 100, and is branched into two to be input to the control controller 110. Of the two branches, one is connected to the N-ch open-circuit output port via resistor R1, and the other is directly connected to the A/D converter port.

The discharge control signal of the discharged battery pack 100 causes the N-ch drain open output port to be in the Low state, and in this manner, it acts to notify that the battery pack is being discharged from its own battery pack to the other battery pack.

The battery connection signal is boosted by the resistor R3 in the battery pack 100 and is connected to the input port of the control controller 110.

Next, a secondary battery system in which the battery pack 100 of the above-described manner is connected in parallel will be described. Fig. 2 is a schematic view showing a circuit configuration of a secondary battery system according to an embodiment of the present invention. Fig. 2 shows that the secondary battery system is constructed by connecting two battery packs in parallel. In Fig. 2, for simplification, the battery pack 1 is indicated at 100 and the battery pack 2 is indicated at 100'. Each battery pack is the same battery pack as that shown in FIG.

The main body side discharge control signal line of the main body side of the electronic device 200 is connected to discharge control signals from the battery pack 1 and the battery pack 2, and is boosted by a resistor R4.

When the battery pack is connected to the main body side connecting circuit of the electronic device 200, as shown in the figure, the terminal T3 for the battery connection signal is connected to the GND, and when the battery pack is connected to the main body side connecting circuit, the battery is input to the input port. The connection signal changes from the Hi level to the Low level, so that the control controller can recognize that the battery pack is connected to the body.

Next, the discharge control signal line of the secondary battery system shown in Fig. 2 will be described. Fig. 3 is a view showing the discharge control signal line of the secondary battery system of the embodiment of the present invention.

To more specifically show, in Fig. 3, the resistance value of the resistor associated with the discharge control signal line is made R1 = 10KΩ, R2 = 10MΩ, and R4 = 10KΩ for calculation.

Fig. 3(A) shows a state in which all of the battery packs are not discharged, Fig. 3(B) shows a state in which one of the battery packs is being discharged, and Fig. 3(C) shows a state in which two of the battery packs are being discharged.

In the case of FIG. 3(A) in which all of the undischarged states are present, since the terminal of the N-ch drain open output port is open, and the voltage boosted by 5 V does not appear to be constant, the voltage of the discharge control signal line becomes 5V. .

In the case of Figure 3 (B) in which one of the battery packs is discharging, the terminal of the N-ch open-circuit output port becomes the LOW level, that is, connected to GND. The total of the step-up resistors is 9.98 KΩ, and the step-down resistance becomes 10 KΩ, so the voltage of the discharge control signal becomes about 2.5 V.

In the case of Fig. 3 (C) in which two of the battery packs are in a discharged state, the 10 kΩ of the step-down resistor is connected in parallel, so that the total is 5 KΩ. The total of the step-up resistors became 9.98 KΩ, and the voltage of the discharge control signal line became approximately 1.66 V.

As described above, according to the configuration of the present invention, when the battery pack in the discharge state is increased, since the voltage of the discharge control signal line is lowered, it is easy to grasp that more than one battery pack is being discharged without requiring a complicated system, or It is the battery pack being discharged.

The basic operation of the control controller 110 for the secondary battery system of the embodiment of the present invention will be described below. Fig. 4 is a view showing a state transition of a secondary battery system according to an embodiment of the present invention.

(1) When the battery pack is not connected

Battery connection signal: Hi input

Discharge control signal: N-ch open-circuit output port open output

Discharge control signal: A/D conversion input port detection 5V

Since the battery connection signal is Hi level, it is determined that the battery is not connected. The discharge switch SW is turned off in consideration of the possibility of external short circuit of the battery pack.

(2) connecting the battery pack to the body side connecting circuit

Battery connection signal: change to Low input

Discharge control signal: N-ch open-circuit output port open output

Discharge control signal: A/D conversion input port detection 3~5V

→Other battery packs are not in discharge→discharge control signal N-ch汲open

The road output port is LOW → discharge switch SW ON

Discharge control signal: A/D conversion input port detection below 3V

→Discharge in other battery packs →Discharge control signal N-ch open circuit

Output port is open circuit output → discharge switch SW OFF

(3) The end of the battery pack itself

Discharge control signal: N-ch open-circuit output port Low→ change becomes open output

Discharge control signal: A/D conversion input port Change from 3V to 5V

(4) When connected to the main body side connection circuit, the discharge control signal of the battery pack itself is N-ch open-circuit output port is open circuit output

Discharge control signal: A/D conversion input port change becomes 3V or more → discharge of other battery packs is completed → discharge switch is turned ON

Discharge control signal: N-ch bungee open output port Low

Discharge control signal: A/D conversion input port detection below 3V

→Discharge of other battery packs→Discharge control signal N-ch汲open circuit output port Open circuit output→discharge switch SW OFF

(5) The battery pack itself is discharged

The discharge switch is kept in the ON state for a certain period of time, and the discharge switch SW is turned off from the confirmation of discharge of the other battery pack.

Discharge control signal: A/D conversion input port detection 2V or less → other battery packs are also discharged → discharge control signal N-ch 汲 open circuit output port Open circuit output → discharge switch SW remains ON

Further, the battery pack to be targeted is mainly two battery packs connected in series (about 8 V) or more, but even one battery pack connected in series can be adapted by changing the detection range of the A/D conversion input port.

As described above, in the battery pack constituting the secondary battery system of the embodiment of the present invention, the discharge control signal and the battery connection signal are provided, and when the state of the signals is used, the discharge is performed outside the battery pack. The discharge is performed, and the battery pack is discharged one at a time. At the end of the discharge, the discharge control signal is changed to Low→change to an open output, and the discharge of the next battery pack is started to continue the supply of electric power, and only the discharged battery pack can be taken out of the system. Charge it.

(industrial availability)

The present invention is a secondary battery system that has been expanded in recent years in applications such as electric machines or electric storage. Up to now, in the battery packs constituting each of the two-stage battery system in parallel connection, the upper control controller needs to be provided with components or sensors for managing voltage, current, temperature, etc., and becomes a cost. In the secondary battery system of the present invention, the control controller is provided in each of the plurality of battery packs, and since the components or the sensors of the above-described methods can be eliminated, the cost can be suppressed, and the industry can be suppressed. The availability is very large.

100, 100’. . . Battery

110, 110’. . . Control controller

200. . . Electronic machine

CL. . . 2nd battery unit

R1, R2, R3, R4. . . resistance

SW. . . Discharge switch

T1, T2, T3, T4. . . Connection terminal

Fig. 1 is a view showing the outline of a circuit structure of one battery pack constituting the secondary battery system of the embodiment of the present invention.

Fig. 2 is a view showing the schematic circuit structure of a secondary battery system according to an embodiment of the present invention.

Fig. 3 is a view showing the discharge control signal line of the secondary battery system of the embodiment of the present invention.

Fig. 4 is a view showing a state transition of a secondary battery system according to an embodiment of the present invention.

100, 100’. . . Battery

110, 110’. . . Control controller

200. . . Electronic machine

CL. . . 2nd battery unit

R1, R2, R3, R4. . . resistance

SW. . . Discharge switch

Claims (6)

A secondary battery system for supplying power to an electronic device; such a secondary battery system, characterized in that it has: a plurality of battery packs each having a control controller; and being disposed on the electronic machine side a body side connection circuit connected to the plurality of battery packs; and a body side discharge control signal line disposed on the body side connection circuit; the body side discharge control signal line is connected to each of the control controllers of the plurality of battery packs. The secondary battery system of claim 1, wherein the discharge control signal line of the control controller is connected to the main body side discharge control signal line when the battery pack is mounted on the electronic device. For example, the secondary battery system of claim 1 or 2, wherein the control controller is input with a battery connection signal useful for identifying the connection of the battery pack. The secondary battery system of claim 3, wherein the discharge control signal input from the main body side discharge control signal line is boosted by a boosting resistor, and then branched into two branches, one of two branches The control is input to the control controller via a resistor, and the other branch is directly input to the control controller. The secondary battery system of claim 4, wherein the body side discharge control signal line is connected to the body side connecting circuit. The discharge control signal of the battery pack is boosted by a resistor, and the battery connection signal is connected to the GND terminal in the body side connection circuit. For example, in the second battery system of claim 5, when the battery pack is connected to the main body side connecting circuit, the battery pack is identified by the level change of the battery connection signal, and the battery pack is used again. The control controller reads the voltage of the discharge control signal to determine whether or not the discharge is permitted.