JP2011222409A - Lithium ion battery pack, power supply device using the same, and battery floodlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lithium ion battery pack allowing exchange of a lead storage battery to a lithium ion battery.SOLUTION: A plurality of lithium ion batteries 30 connected in series and a substrate 4 mounted with a voltage monitoring circuit for monitoring voltages for each of the lithium ion batteries 30 and a temperature monitoring circuit for monitoring the temperature in a case body 5 are housed inside of the case body 5 with a lid. Positive and negative electrode terminal plates 42 and 43 conducting into the series circuit of the lithium ion batteries 30 and connectors 44 and 45 into which the monitored result by the voltage monitoring circuit and the temperature monitoring circuit is output are provided on a lid 50 so as to project toward the outside of the case 5.

Description

  The present invention relates to a lithium ion battery pack in which a plurality of lithium ion batteries connected in series are accommodated in a case body with a lid, a power supply device using the lithium ion battery pack, and a power source The present invention relates to a battery-projector in which the apparatus is used.

  Conventionally, as a projector used for night work, particularly a projector used in a place where supply of AC power cannot be obtained, the projector is driven by a generator driven by an internal combustion engine and driven by the generated power. Optical machines have been widely used. However, since this type of projector generates exhaust gas and noise during operation and causes environmental destruction, a battery projector that turns on the projector with a battery has been adopted (for example, Patent Documents). 1).

JP-A-11-224506

  However, since the conventional battery projector uses a lead storage battery as a battery, there is a problem that not only the weight is increased, but also the life is short and charging takes time. Therefore, it is possible to use a lithium-ion battery that is lightweight and has a long life and can be charged in a short time, instead of a lead-acid battery. As a result, the internal pressure of the battery may increase, or an internal short circuit may occur due to deposition of metallic lithium or the like. In particular, a short circuit inside the lithium ion battery rapidly raises the temperature and causes a fire accident. Therefore, special care must be taken to ensure safety in handling.

  Replace the lead-acid battery that has reached the end of its life in a battery projector that uses a lead-acid battery as a power supply, and in battery-powered machines other than the battery projector (for example, battery welders). In order to replace a lead-acid battery with a long-life lithium ion battery, it is essential to take measures to ensure safety during charging and discharging in consideration of the characteristics of the lithium ion battery described above. However, it is practically difficult to replace the lead-acid battery with a lithium ion battery.

  The present invention has been made paying attention to the above-mentioned problem. A plurality of serially connected lithium ion batteries are accommodated in a case body with a lid in a state where the voltage of each lithium ion battery can be monitored from the outside. A lithium ion battery pack that can replace a lead-acid battery with a lithium ion battery, a power supply device using the lithium ion battery pack, and a battery floodlight using the power supply device The purpose is to provide a machine.

  In the lithium ion battery pack according to the first aspect of the present invention, a plurality of lithium ion batteries connected in series and a voltage monitoring circuit for monitoring the voltage of each lithium ion battery are mounted in a case body with a lid. The board is stored. The lid is provided with positive and negative electrode terminal portions that are electrically connected to a series circuit of the lithium ion battery and an output terminal portion that outputs a monitoring result by the voltage monitoring circuit in a state of projecting to the outside.

  Since the lithium ion battery pack having the above-described configuration uses a lithium ion battery, it is lighter in weight than a lead-acid battery and is convenient for handling and carrying. Moreover, since the lifetime is long, it is not necessary to frequently replace the battery. Furthermore, since the charging time can be shortened, the labor involved in the charging work is greatly reduced. In addition, since the voltage monitoring circuit is built into the case body and the monitoring result is output from the output terminal part, it is possible to grasp the suitability of the charging / discharging state and to control charging / discharging so that overcharging and overdischarging do not occur. The safety at the time of charging / discharging can be secured easily. Therefore, in a battery-driven machine using a lead-acid battery, it is possible to replace a lead-acid battery whose life has been exhausted with a long-life lithium ion battery.

In the above-described configuration of the present invention, the voltage monitoring circuit may have various modes. However, the preferred embodiment has a voltage detection circuit for each lithium ion battery that detects the voltage of each lithium ion battery, and each voltage. It includes a determination circuit that determines whether or not the detection voltage by the detection circuit is within an appropriate range, and an output circuit that outputs a determination result by each determination circuit.
According to this embodiment, the determination result of whether or not the voltage of each lithium ion battery is appropriate is output from the output circuit, so that charging and discharging can be stopped with respect to the inappropriate determination result.

In an embodiment according to the invention of claim 3, a temperature monitoring circuit for monitoring the temperature in the case body is further mounted on the substrate, and a monitoring result is output to the lid by the temperature monitoring circuit. The output terminal portion is further provided in a state of protruding to the outside.
According to this embodiment, even if the temperature suddenly increases due to a short circuit inside the lithium ion battery, the temperature inside the case body is monitored by the temperature monitoring circuit. Can be prevented.

  According to a fourth aspect of the present invention, there is provided a power supply apparatus for supplying electric power from a battery to an external device, wherein the casing stores at least one lithium ion battery pack according to the first aspect. And a circuit for controlling the discharge of the lithium ion battery and the charging of the lithium ion battery by the charger according to the monitoring result by the voltage monitoring circuit output from the output terminal unit. It is. On the outer surface of the housing, a power input unit connected to an AC power source for charging, a power supply unit for supplying power to an external device from the lithium ion battery, and a monitoring result by the voltage monitoring circuit are displayed. A display unit is provided.

  In the above power supply device, when a battery-driven external device is connected to the power supply unit and driven, power is supplied and consumed from the lithium ion battery. Depending on the monitoring result by the voltage monitoring circuit, the lithium ion battery Since the discharge is controlled, overdischarge is prevented. In addition, when the lithium ion battery is charged by connecting an AC power supply to the power input unit, charging of the lithium ion battery is controlled according to the monitoring result by the voltage monitoring circuit, so that overcharging is prevented. Moreover, since the monitoring result by the voltage monitoring circuit is displayed on the display unit, it is possible to grasp the suitability of the voltage of the lithium ion battery by the display.

  Another power supply device according to the invention of claim 5 is a power supply device for supplying electric power from the battery to an external device, and stores at least one lithium ion battery pack according to claim 3. Has a housing, and controls the discharge of the lithium ion battery and the charging of the lithium ion battery by the charger according to the monitoring results by the voltage monitoring circuit and the temperature monitoring circuit output from the output terminal section inside the housing The circuit which performs is incorporated. On the outer surface of the housing, a power input unit connected to an AC power source for charging, a power supply unit for supplying power to an external device from a lithium ion battery, and a monitoring result and the temperature by the voltage monitoring circuit A display unit for displaying the monitoring result by the monitoring circuit is provided.

  In the above power supply device, when a battery-driven external device is connected to the power supply unit and driven, power is supplied and consumed from the lithium ion battery, depending on the monitoring results by the voltage monitoring circuit and the temperature monitoring circuit. Since discharge of the lithium ion battery is controlled, overdischarge is prevented. In addition, when the lithium ion battery is charged by connecting an AC power supply to the power input unit, charging of the lithium ion battery is controlled according to the monitoring results of the voltage monitoring circuit and the temperature monitoring circuit, so that overcharging is prevented. In addition, since the monitoring unit displays the monitoring result by the voltage monitoring circuit and the monitoring result by the temperature monitoring circuit, the display unit can grasp whether the voltage of the lithium ion battery is appropriate and whether the temperature of the lithium ion battery is appropriate.

In a preferred embodiment of the present invention, the casing can select and store either a predetermined number of lithium ion battery packs or the same number of lead storage batteries as the lithium ion battery pack. .
According to this embodiment, since a predetermined number of lithium ion battery packs and the same number of lead storage batteries can be stored in the same casing, it is necessary to prepare a casing for each type of storage battery. Stock management is easy.

  A battery projector according to a seventh aspect of the invention comprises a light projector and a power supply device with a caster for supplying power to the light source of the light projector. A housing for storing at least one of the described lithium ion battery packs, and discharge of the lithium ion battery in the housing according to the monitoring result by the voltage monitoring circuit output from the output terminal unit And a circuit for controlling the charging of the lithium ion battery by the charger. On the outer surface of the housing, a power input unit connected to an AC power source for charging, a power supply unit for supplying power from a lithium ion battery to the light source of the projector, and a monitoring result by the voltage monitoring circuit are displayed. A display unit is provided.

  In the above battery floodlight, when a floodlight is connected to the power supply unit and lit, power is supplied and consumed from the lithium ion battery, but the lithium ion battery is discharged according to the monitoring result by the voltage monitoring circuit. Since it is controlled, overdischarge is prevented. In addition, when the lithium ion battery is charged by connecting an AC power supply to the power input unit, charging of the lithium ion battery is controlled according to the monitoring result by the voltage monitoring circuit, so that overcharging is prevented. Moreover, since the monitoring result by the voltage monitoring circuit is displayed on the display unit, it is possible to grasp the suitability of the voltage of the lithium ion battery by the display.

  A battery projector according to an eighth aspect of the present invention includes a projector and a power supply device with a caster for supplying electric power to the light source of the projector, the power supply device according to the third aspect. A housing that houses at least one of the described lithium ion battery packs, and in the housing, the lithium according to the monitoring results by the voltage monitoring circuit and the temperature monitoring circuit output from the output terminal unit A circuit for controlling discharge of the ion battery and charging of the lithium ion battery by the charger is incorporated. On the outer surface of the housing, a power input unit connected to an AC power supply for charging, a power supply unit for supplying power from a lithium ion battery to the light source of the projector, and a monitoring result by the voltage monitoring circuit and the A display unit is provided for displaying the result of monitoring by the temperature monitoring circuit.

  In the above battery floodlight, when a floodlight is connected to the power supply unit and lit, power is supplied from the lithium ion battery and consumed. However, depending on the monitoring results by the voltage monitoring circuit and the temperature monitoring circuit, the lithium ion battery Since the discharge of the battery is controlled, overdischarge is prevented. In addition, when the lithium ion battery is charged by connecting an AC power supply to the power input unit, charging of the lithium ion battery is controlled according to the monitoring results of the voltage monitoring circuit and the temperature monitoring circuit, so that overcharging is prevented. In addition, since the monitoring unit displays the monitoring result by the voltage monitoring circuit and the monitoring result by the temperature monitoring circuit, the display unit can grasp whether the voltage of the lithium ion battery is appropriate and whether the temperature of the lithium ion battery is appropriate.

According to this invention, since a plurality of lithium ion batteries connected in series are housed in a case body with a lid in a state where the voltage of each lithium ion battery can be monitored from the outside, the battery is charged and discharged. Safety during charging / discharging can be easily ensured, such as by checking the suitability and controlling charging / discharging so that overcharging and overdischarging do not occur. Therefore, in a power supply device using a lead storage battery and various types of battery-powered devices, it is possible to replace a lead storage battery with a long life with a lithium ion battery with a long life.
Furthermore, since a plurality of lithium ion batteries connected in series are packed in a case body with a lid so that the temperature inside the case body can be monitored from the outside, they are short-circuited inside each lithium ion battery. Even if the temperature rises suddenly due to the above, it is possible to prevent the occurrence of a fire accident.
Further, in the power supply device and battery projector of the present invention using the above-described lithium ion battery pack, charging / discharging of the lithium ion battery is controlled according to the monitoring result by the voltage monitoring circuit or the temperature monitoring circuit. It is possible to prevent an increase in pressure inside the battery due to discharge or overcharge or an increase in temperature due to an internal short circuit, and it is possible to ensure safety in use of the power supply device or a battery projector using the power supply device.

It is a perspective view which shows the external appearance of the battery projector which is one Example of this invention. It is a perspective view which shows the state in which three lithium ion battery packs are accommodated in the lower housing | casing of a power supply device. It is a front view which shows the lithium ion battery pack in the case body and a cross section. It is a disassembled perspective view of a lithium ion battery pack. It is a front view which expands and shows the operation display part of a power supply device. It is an electric circuit diagram which shows the whole circuit structure of a battery projector. It is a block diagram which shows the structure of a voltage monitoring circuit. It is an electric circuit diagram which shows the structure of the circuit which controls charge and discharge. It is a flowchart which shows the flow of the monitoring operation at the time of discharge. It is a flowchart which shows the flow of the monitoring operation | movement at the time of charge. It is a flowchart which shows the flow of control by the discrimination circuit of a voltage monitoring circuit.

  FIG. 1 shows the appearance of a battery projector according to an embodiment of the present invention. The battery projector in the illustrated example includes a projector 1 in which a light source 11 is attached to an upper end portion of a leg 10, and a power supply device 2 for supplying power to the light source 11 of the projector 1. The power supply device 2 of this embodiment uses three lithium ion battery packs having a rated output voltage of 12 volts (details will be described later) connected in series, and the rated output voltage is 36 volts (12 volts × 3). Is set. If one lithium ion battery pack is used, a power supply device with a rated output voltage of 12 volts can be configured. Similarly, if two battery devices are used, a power supply device with a rated output voltage of 24 volts can be used, and the rated output voltage can be increased. Each 48 volt power supply can be configured.

In the projector 1, three legs 13 are attached to equiangular positions on the outer peripheral surface of the support column 12 to form a leg portion 10. A caster 14 is attached to the lower end of each leg 13 so that the floor surface can be moved. The support column 12 is a hollow pipe, and a slide shaft 15 is inserted into the pipe bore from the upper end surface. A light source 11 is supported at the upper end of the slide shaft 15 via a support frame 16 so as to be able to swing up and down. The light source 11 can be positioned at a desired height by sliding the slide shaft 15 in the vertical direction and fixing it by the stopper 17.
In this embodiment, the light source 11 is constituted by a plurality of LEDs, but is not limited to LEDs. Further, although the projector 1 in the illustrated example is independent of the power supply device 2, it can also be provided integrally with the power supply device 2.

In the power supply device 2, the casing 20 has a box shape, and the upper casing 20b is detachably attached to the opening on the upper surface of the lower casing 20a. Casters 21 are provided at the four corners of the lower end portion of the lower housing 20a so that the floor surface can be moved. As shown in FIG. 2, the internal space 22 of the lower housing 20 a is formed in a size that can accommodate three lithium ion battery packs 3 that form a rectangular parallelepiped. In the upper casing 20b, various relays shown in FIG. 6, that is, the electromagnetic relays R ₁ , R ₂ , R ₃ constituting the discharge control circuit 61, the charge control circuit 62, and the charge / discharge control circuit 63, A control board (not shown) on which the contacts 64 to 67 and the like are mounted, a display board (not shown) on which circuits for controlling operations of input / output units of the operation display unit 100 described later are mounted, and the like. It has been incorporated.

As shown in FIGS. 3 and 4, the lithium ion battery pack 3 according to this embodiment has a configuration in which four lithium ion batteries 30 are connected in series with a circuit constituting the monitor unit 7 shown in FIG. Along with the monitoring substrate 4 that has been made, it is housed in a sealed state inside a case body 5 with a lid and is packed. The lithium ion battery 30 used in this example is a lithium ion battery having an output voltage of 3.3 volts, that is, a positive electrode formed of iron-based composite oxide (LiFeO ₂ ). In this embodiment, by using four lithium ion batteries having an output voltage of 3.3 volts, an output voltage (3.3 volts × 4 = 13.2 volts that can be substituted for a lead storage battery having a rated output voltage of 12 volts). ) Of lithium ion battery pack 3 is formed.
The lithium ion battery pack 3 of this embodiment has substantially the same external shape as that of a lead storage battery having a rated output voltage of 12 V, and the lower casing is used for any of the three lithium ion battery packs 3 and the three lead storage batteries. It can be stored inside the body 20a. Therefore, this housing | casing 20 can be used also for the power supply device using a lithium ion battery, and the power supply device using a lead acid battery.

  Each lithium ion battery pack 3 includes four lithium ion batteries 30 connected in series by a conductive plate 41 inside a case body 5 whose upper surface opening 51 is closed by a lid 50, and positive and negative electrode terminals 31 and 32. Are placed in an aligned state with the circuit board facing upward, and the monitoring substrate 4 on which a circuit or the like constituting the monitor unit 7 is mounted is housed in a state of being screwed to the inner surface of the lid 50. In FIG. 4, 54 and 55 are metal plates for screwing attached to positions facing the opening 51 of the case body 5, and the lid 50 and the metal plate 54 placed on the opening 51 of the case body 5. , 55 is screwed to hold the lid 50 in a closed state.

  The monitor unit 7 includes a voltage monitoring circuit 8 shown in FIG. 7 for monitoring the voltage of each lithium ion battery 30 and a temperature monitoring circuit 9 shown in FIG. 8 for monitoring the temperature inside the case body 5. Although included, the configurations and operations of the voltage monitoring circuit 8 and the temperature monitoring circuit 9 will be described later. The monitoring substrate 4 is preferably attached to the inner surface of the lid 50 with a screw or the like. However, the present invention is not limited to this, and a space may be provided inside the case body 5 and stored in the space. .

  Rectangular attachment holes 56 and 57 are provided at the center positions of both ends of the lid 50. Connectors 44 and 45 constituting output terminal portions to which the monitoring results from the voltage monitoring circuit 8 and the temperature monitoring circuit 9 are output are attached to the mounting holes 56 and 57 so as to protrude to the outside. One connector 44 is connected to the connector 45 of the other lithium ion battery pack 3, and the other connector 45 is connected to the connector 44 of the other lithium ion battery pack 3. Details of the configurations and connection states of the connectors 44 and 45 will be described later.

  In FIG. 4, 31 and 32 are positive and negative electrode terminals of each lithium ion battery 30, and the positive electrode terminal 31 and the negative electrode terminal 32 are connected by a conductive plate 41 between adjacent lithium ion batteries 30 and 30. By doing so, the four lithium ion batteries 30 are connected in series. A positive electrode terminal plate 42 is attached to the positive electrode terminal 31 of the lithium ion battery 30 at one end, and a negative electrode terminal plate 43 is attached to the negative electrode terminal 32 of the lithium ion battery 30 at the other end. . Each of the electrode terminal plates 42 and 43 is bent in an L shape, and the raised portion penetrates through holes 52 and 53 formed in the lid 50 and protrudes to the upper surface of the lid 50. By sequentially connecting the positive electrode terminal plate 42 and the negative electrode terminal plate 43 between the adjacent lithium ion battery packs 3, 3, the positive electrode terminal plate 42 of one end of the lithium ion battery pack 3 and the other end of the other end are connected. A rated output voltage of 36 volts is obtained between the negative electrode terminal plate 43 of the lithium ion battery pack 3.

  As shown in FIG. 1, a power supply unit 27 for supplying power to the light source 11 of the projector 1 is provided on the rear surface of the upper housing 20 b, and the power supply unit 27 and the light source 11 are connected by a connection cord 23. Electrical connection. In FIG. 1, reference numerals 29a and 29b denote internal circuit connecting portions provided in the lower casing 20a and the upper casing 20b. By connecting the internal circuit connecting sections 29a and 29b with the connecting cord 24, A predetermined circuit in the housing 20a is electrically connected to a predetermined circuit in the upper housing 20b.

  FIG. 5 shows a configuration of the operation display unit 100 provided on the front surface of the upper housing 20b. The operation display unit 100 includes a changeover switch 101 for switching on / off and turning on / off the power source, and a voltage level indicator lamp for displaying the magnitude of the total voltage of the three lithium ion battery packs 3. 102, a charging indicator lamp 103 that lights up to indicate that charging is in progress, and a voltage that lights up to indicate that the voltage of any one of the lithium ion batteries 30 has fallen below the discharge end voltage (2.5 volts in this embodiment). A drop indicator lamp 104 and an abnormal indicator lamp 105 that lights and indicates that the internal temperature of any one of the lithium ion battery packs 3 exceeds 60 ° C. are provided, and a power cord 25 connected to an AC power source is provided. A power input unit 28 for connection is provided.

FIG. 6 shows a main circuit configuration of the battery projector having the above-described configuration.
In the figure, reference numeral 60 denotes a charging circuit that can be energized by connecting the plug 26 to an AC power source. The charging circuit 60 includes a contact 64 of the electromagnetic relay R ₁ constituting the charging control circuit 62 and a charging / discharging control circuit 63. and the contact 66 of the electromagnetic relay R ₃ constituting the is interposed. One of the electromagnetic relay R ₁ is contact 64 is urged when the overcharge is opened, the other electromagnetic relay R ₃ in which opening the contact 66 is biased when there is excessive temperature rise, either Also in this case, charging by the charger 68 is stopped.

In the figure, reference numeral 6 denotes a lighting circuit that is energized at the time of lighting. The lighting circuit 6 includes a contact 65 of an electromagnetic relay R ₂ constituting a discharge control circuit 61 and an electromagnetic relay R constituting a charge / discharge control circuit 63. ₃ contacts 67 are interposed. One of the electromagnetic relay R ₂ is urged when the over-discharge open contact 64, the other electromagnetic relay R ₃ in which opening the contact 67 is biased when there is excessive temperature rise, either Also in this case, energization to the projector 1 is stopped and the light source 11 is turned off.
In the figure, illustration of a circuit for controlling the input / output operation of the changeover switch 101 and various indicator lamps provided in the operation display unit 100 is omitted, but this type of circuit is an electromagnetic relay and its circuit. It can be easily configured using a relay circuit composed of contacts.

  FIG. 7 shows a configuration of a voltage monitoring circuit 8 for each lithium ion battery constituting the monitor unit 7 of the lithium ion battery pack 3. Each voltage monitoring circuit 8 includes a voltage conversion circuit 81, a voltage detection circuit 82, a determination circuit 83, and output circuits 88 and 89. The voltage detection circuit 82 detects the voltage across the lithium ion battery 30. The voltage conversion circuit 81 converts the voltage of the lithium ion battery 30 into a voltage necessary for driving the determination circuit 83 and supplies it to the determination circuit 83. The discrimination circuit 83 is constituted by a microcomputer, and whether or not the voltage of the lithium ion battery 30 detected by the voltage detection circuit 82 is in an overdischarged state, that is, below the end-of-discharge voltage (2.5 volts in this embodiment). Whether or not the battery is in an overcharged state, that is, whether or not the charge end voltage (4.3 volts in this embodiment) has been exceeded.

  One output circuit 88 includes an overvoltage display circuit 84 and a photocoupler 86. When the determination circuit 83 determines that the overcharge state is present, the overvoltage display circuit 84 is operated to drive the photocoupler 86 to light. The overvoltage monitor output is supplied to the transistor TR1 of the charge control circuit 62. The transistor TR1 constitutes an OR circuit, and is turned on when an overvoltage monitoring output is given from any of the photocouplers 86 of the four voltage monitoring circuits 8.

  The other output circuit 89 includes an overdischarge display circuit 85 and a photocoupler 87. When the determination circuit 83 determines that the overdischarge state is present, the overdischarge display circuit 85 is operated to turn on the photocoupler 86. The overdischarge monitoring output is applied to the transistor TR2 of the charge control circuit 62. The transistor TR2 constitutes an OR circuit, and is turned on when an overdischarge monitoring output is given from any of the photocouplers 87 of the four voltage monitoring circuits 8.

Figure 8 is composed of a charge control circuit 62 consists of three transistors TR1 and the electromagnetic relay R ₁ of each of the lithium-ion battery pack 3, the transistor TR2 and the electromagnetic relay R ₂ for each of the lithium ion battery pack 3 that the discharge control circuit 61, shows the configuration of the charge and discharge control circuit 63 constituted by the temperature sensor 90 and the electromagnetic relay R ₃ incorporated in each of the lithium-ion battery pack 3.
The temperature sensor 90 of this embodiment is a thermostat and is provided on the monitoring substrate 4 inside the case body 5 of each lithium ion battery pack 3, and the temperature inside the case body 5 is a predetermined temperature (this implementation). In the example, the contact opens when the temperature exceeds 60 ° C.).

  In FIG. 8, 44 and 45 are two connectors provided in each lithium ion battery pack 3, and each connector 44 and 45 has four terminals T1-T4, respectively. The first terminal T1 of each connector 44, 45 has a line conducting between the terminals T1, T1 of the connectors 44, 45, and the second terminal T2 has a line conducting with the collector of the transistor TR1 is the third terminal. A line conducting to the collector of the transistor TR2 is connected to T3, and a line conducting to the temperature monitoring circuit 9 including the temperature sensor 90 is connected to the fourth terminal T4.

  The connectors 44 and 45 of the adjacent lithium ion battery packs 3 and 3 are connected by a four-wire cord 110. The lithium ion battery pack 3 at one end has the second to fourth terminals T2 to T4 connected to the plus line (+) via the electromagnetic relays R1 to R3, and the lithium ion battery pack 3 at the other end has the first terminal T1. And the fourth terminal T4 is connected to the minus line (-).

Each transistor TR1. TR2 is in an off state when none of the four lithium ion batteries 30 is in an overcharge or overdischarge state. In this off state, each transistor TR1. Since the collector of TR2 is open, the electromagnetic relays R ₁ and R ₂ are not energized, and the contact 64 in the charging circuit 60 and the contact 65 in the lighting circuit 6 are closed. When the lithium ion battery 30 of any one of the three lithium ion battery packs 3 is overcharged or overdischarged, the transistor TR1 or TR2 of the corresponding lithium ion battery pack 3 is turned on, The electromagnetic relay R ₁ or R ₂ is energized, and the contact 64 in the charging circuit 60 or the contact 65 in the lighting circuit 6 opens.

Since the temperature sensor 90 of each lithium ion battery pack 3 is closed unless the temperature in the case body 5 is excessively increased, the electromagnetic relay R ₃ is energized, and the contact 66 in the charging circuit 60 or The contact 67 in the lighting circuit 6 is in a closed state. When three have either the excessive temperature rise of the lithium-ion battery pack 3, opening the contacts of the temperature sensor 90 of the lithium-ion battery pack 3 applicable is, the electromagnetic relay R ₃ is energized, the charging circuit 60 The contact 66 in the center and the contact 67 in the lighting circuit 6 are opened.

FIG. 9 shows the flow of monitoring operation during discharging, and FIG. 10 shows the flow of monitoring operation during charging. Hereinafter, the operation of the battery projector will be described with reference to FIG. In the figure, “ST” is an abbreviation for “STEP” (procedure).
Now, when the changeover switch 101 of the operation display unit 100 of the power supply device 2 is operated and set to the lighting mode, the determination of ST1 in FIG. 9 becomes “YES”, and from the 12 lithium ion batteries 30 connected in series. Electric power is supplied to the projector 1 and the light source 11 is turned on. In the operation display unit 100, the voltage level indicator lamp 102 is turned on, and the total voltage of the twelve lithium ion batteries 30 is displayed (ST2).

In the next ST3, it is determined whether or not the temperature in the case body 5 is 60 ° C. or less for all the lithium ion battery packs 3. In the subsequent ST4, the voltages of all the lithium ion batteries 30 are equal to 2 at the discharge end voltage. It is determined whether it is greater than 5 volts. If both determinations are “YES”, there is no excessive temperature rise and no over-discharge state, so ST3 and 4 are continuously monitored unless the changeover switch 101 is turned off.
If the changeover switch 101 is turned off, the determination in ST5 is “YES” and the process proceeds to ST6, the power supply to the projector 1 is stopped, the light source 11 is turned off, and the voltage level indicator lamp 102 is also turned off. .

In the monitoring loop of ST3 to ST5 described above, when the temperature in the case 5 exceeds 60 ° C. for any lithium ion battery pack 3, the determination of ST3 is “NO”, and the abnormality indicator lamp of the operation display unit 100 105 is turned on and it is informed that there has been an excessive temperature rise (ST7), power supply to the projector 1 is stopped, and the light source 11 is turned off (ST10).
For any lithium ion battery pack 3, when the voltage of any lithium ion battery 30 falls below the discharge end voltage of 2.5 volts, the determination of ST4 is “NO”, and the overdischarge state is On the condition that it has continued for a certain period of time (10 seconds in this embodiment), the process proceeds from ST8 to ST9, where the voltage drop indicator lamp 104 is lit and informed that overdischarge occurs, and power supply to the projector 1 is stopped. Then, the light source 11 is turned off (ST10).
When the changeover switch 11 is turned off, the determination in ST11 is “YES”, and the indicator lamp that is lit is extinguished (ST12).

  On the other hand, when the changeover switch 101 of the operation display unit 100 of the power supply device 2 is operated to set the charging mode, the determination of ST1 in FIG. 10 is “YES”, and the plug 26 is connected to the AC power supply of 100 volts. Then, the determination of ST2 is also “YES”, charging of the twelve lithium ion batteries 30 connected in series is started, and a timer for measuring the charging time starts measuring time (ST3). Then, the charging indicator lamp 103 and the voltage level indicator lamp 102 are turned on with the start of charging (ST4).

  In the next ST5, for all the lithium ion battery packs 3, it is determined whether or not the voltages of all the lithium ion batteries 30 are equal to or lower than the charge end voltage of 4.3 volts. In the subsequent ST6, the temperature in the case body 5 is determined. Is determined to be 60 ° C. or lower. If both determinations are “YES”, the battery is not overcharged and there is no excessive temperature rise, so monitoring of ST5 and ST6 is repeated unless the timer expires.

When the timer counts the predetermined charging time (2.5 hours in this embodiment), the determination of ST7 is “YES”, charging is stopped and the timer stops timing (ST8), and the charging indicator 102 is turned off. (ST9).
When the changeover switch 101 is turned off, the determination in ST10 is “YES”, the process proceeds to ST11, and all the indicator lights are turned off.

In the monitoring loop of ST5 to ST7 described above, when the voltage of any lithium ion battery 30 exceeds the charge end voltage of 4.3 volts for any lithium ion battery pack 3, the determination of ST5 is “NO”. On the condition that the overcharge state has continued for a certain time (10 seconds in this embodiment), the process proceeds from ST12 to ST8, charging is stopped, the timer stops timing, and the charge indicator lamp 102 is turned off. (ST9).
In addition, for any lithium ion battery pack 3, when the temperature in the case 5 exceeds 60 ° C., the determination of ST6 becomes “NO”, the abnormality indicator lamp 105 is lit and there is an excessive temperature rise. Similarly, the charging is stopped and the timer stops timing (ST8), and the charging indicator lamp 102 is turned off (ST9).

FIG. 11 shows the flow of voltage monitoring control by the discrimination circuit 83 of the voltage monitoring circuit 8 executed for each lithium ion battery 30 in each lithium ion battery pack 3.
If the changeover switch 101 of the operation display unit 100 of the power supply device 2 is operated to set the lighting mode or the charging mode, the determination of ST1 in FIG. 11 becomes “YES”, and the initial monitoring state is set in ST2. Thereafter, overcharge monitoring is repeatedly performed in ST3 to ST7, and overdischarge monitoring is repeatedly performed in ST8 to ST12.

  In ST3, the determination circuit 83 determines whether the voltage of the lithium ion battery 30 detected by the voltage detection circuit 82 is equal to or higher than the charge end voltage of 4.3 volts. If the determination is “NO”, ST4 to ST7 are skipped because the battery is not overcharged, and then the determination circuit 83 determines whether the voltage of the lithium ion battery 30 is equal to or less than 2.5 volts of the discharge end voltage. It is determined whether or not (ST8). If the determination of ST8 is “NO”, ST9 to ST12 are skipped because the overdischarge state is not established, and the process returns to the overcharge monitoring loop of ST3 to ST7.

When it is determined in ST3 that the voltage of the lithium ion battery 30 detected by the voltage detection circuit 82 is equal to or higher than the charge end voltage of 4.3 volts, the process proceeds from ST3 to ST4, and the determination circuit 83 is in the overcharge state. Is continued for a certain time (10 seconds in this embodiment). When the determination is “YES”, the determination circuit 83 determines that it is in an overcharge state, operates the overvoltage display circuit 84 to drive the photocoupler 86 to turn on, and outputs the overvoltage monitor output to the transistor TR1 of the charge control circuit 62. (ST5).
In the next ST6, the process waits for the voltage of the lithium ion battery 30 to drop to 4.0 volts or less. When the determination is “YES”, the determination circuit 83 stops the operation of the overvoltage display circuit 84, The overvoltage monitoring output is turned off (ST7).

When it is determined in ST8 that the voltage of the lithium ion battery 30 detected by the voltage detection circuit 82 is 2.5 volts or less of the end-of-discharge voltage, the process proceeds from ST8 to ST9, and the determination circuit 83 is in an overdischarge state. Is continued for a certain time (10 seconds in this embodiment). When the determination is “YES”, it is determined that the determination circuit 83 is in an overdischarge state, the overdischarge display circuit 85 is operated, the photocoupler 87 is driven to turn on, and the overdischarge monitor output is output from the discharge control circuit 61. The signal is applied to the transistor TR2 (ST10).
In the next ST11, the process waits for the voltage of the lithium ion battery 30 to rise to 3.0 volts or higher. When the determination is “YES”, the determination circuit 83 stops the overdischarge display circuit 85 operation, The overdischarge monitoring output is turned off (ST12).

  Although the above shows one preferred embodiment for carrying out the present invention, the present invention is not limited to the above embodiment, and the present invention is not limited to this embodiment. The range is not limited.

DESCRIPTION OF SYMBOLS 1 Light projector 2 Power supply device 3 Lithium ion battery pack 4 Board | substrate 5 Case body 8 Voltage monitoring circuit 9 Temperature monitoring circuit 11 Light source 20 Case 27 Power supply part 28 Power supply input part 30 Lithium ion battery 42,43 Electrode terminal board 44.45 Connector 50 Lid 82 Voltage detection circuit 83 Discrimination circuit 88, 89 Output circuit 90 Temperature sensor 100 Operation display section

Claims (8)

  A case body with a lid contains a plurality of lithium ion batteries connected in series and a substrate on which a voltage monitoring circuit for monitoring the voltage of each lithium ion battery is mounted. A lithium ion battery pack comprising: positive and negative electrode terminal portions that are electrically connected to a battery series circuit; and an output terminal portion that outputs a monitoring result from the voltage monitoring circuit.   The voltage monitoring circuit includes a voltage detection circuit for each lithium ion battery that detects the voltage of each lithium ion battery, a determination circuit that determines whether the detection voltage by each voltage detection circuit is within an appropriate range, and each determination circuit The lithium-ion battery pack according to claim 1, further comprising: an output circuit that outputs a discrimination result according to the above.   The substrate is further mounted with a temperature monitoring circuit for monitoring the temperature inside the case body, and the lid further includes an output terminal portion to which a monitoring result is output by the temperature monitoring circuit protruding to the outside. The lithium ion battery pack according to claim 1 provided.   A power supply device for supplying electric power from a battery to an external device having a casing in which at least one lithium ion battery pack according to claim 1 is stored, and inside the casing, A circuit for controlling the discharge of the lithium ion battery and the charging of the lithium ion battery by the charger is incorporated according to the monitoring result by the voltage monitoring circuit output from the output terminal unit, and the AC is charged on the outer surface of the housing for charging. A power supply device comprising: a power input unit connected to a power source; a power supply unit for supplying power to an external device from a lithium ion battery; and a display unit for displaying a monitoring result by the voltage monitoring circuit.   A power supply device for supplying electric power from a battery to an external device, wherein the power supply device has a casing in which at least one lithium ion battery pack according to claim 3 is stored, A circuit for controlling the discharge of the lithium ion battery and the charging of the lithium ion battery by the charger according to the monitoring result by the voltage monitoring circuit and the temperature monitoring circuit output from the output terminal unit is incorporated, and charging is performed on the outer surface of the housing. Power supply input unit connected to an AC power source for power supply, a power supply unit for supplying power to an external device from a lithium ion battery, and the monitoring result by the voltage monitoring circuit and the monitoring result by the temperature monitoring circuit are displayed. A power supply device provided with a display unit for performing the above operation.   The said housing | casing can select and accommodate any one of the fixed number of lithium ion battery packs and the same number of lead acid batteries as a lithium ion battery pack. Power supply.   A battery projector comprising a projector and a power supply device with a caster for supplying power to a light source of the projector, wherein the power supply device is at least one lithium ion battery according to claim 1. A housing for storing the pack, and discharging the lithium ion battery and charging the lithium ion battery by a charger according to the monitoring result of the voltage monitoring circuit output from the output terminal section inside the housing; A control circuit is incorporated, and a power input unit connected to an AC power supply for charging on the outer surface of the housing, a power supply unit for supplying power from a lithium ion battery to the light source of the projector, and the voltage monitoring A battery floodlight provided with a display for displaying a monitoring result by a circuit.   A battery projector comprising a projector and a power supply device with a caster for supplying power to a light source of the projector, wherein the power supply device is at least one lithium ion battery according to claim 3. A housing for storing the pack, and in the housing, discharge of the lithium ion battery and lithium ion by the charger according to the monitoring results by the voltage monitoring circuit and the temperature monitoring circuit output from the output terminal unit A circuit for controlling charging of the battery is incorporated, and on the outer surface of the housing, a power input unit connected to an AC power source for charging, a power supply unit for supplying power from the lithium ion battery to the light source of the projector, And a battery floodlight provided with a display unit for displaying the monitoring result by the voltage monitoring circuit and the monitoring result by the temperature monitoring circuit.

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