KR101634437B1 - Modular apparatus for charge and dischare of electric energy - Google Patents

Abstract

The present invention relates to a modular charge / discharge device. A modular charging and discharging apparatus according to the present invention includes a control unit for receiving a test command from an operating PC to control a test schedule and transmitting the test data to the operating PC; A sensing unit for receiving at least one of the measured values of the charging current and the terminal voltage of the secondary battery, and comparing the measured value with a preset reference value; A charging unit for charging or discharging when the feedback measurement value reaches the reference value using the comparison result of the sensing unit to prevent overcharge or overdischarge; A relay unit receiving a control signal from the control unit and outputting a charging / discharging signal to the charging unit; Wherein the sensing unit, the charging unit, the relay unit, and the display unit are modularized into one module, and one or more modules corresponding to the number of the secondary batteries are formed on the main board, As shown in FIG.
As described above, according to the present invention, the components of the charging and discharging device are modularized, so that it is easy to expand the equipment according to the increase of the test secondary battery. In addition, by constituting one control unit communicating with the operating PC, it is possible to easily control charge / discharge of the secondary battery on a channel-by-channel basis.

Description

[0001] MODULAR APPARATUS FOR CHARGE AND DISCHARGE OF ELECTRIC ENERGY [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge and discharge apparatus, and more particularly, to a modular charge and discharge apparatus for performing a charge and discharge test in a secondary battery process.

The secondary battery is a battery capable of repeatedly charging and discharging the secondary battery. The secondary battery is reversibly reversible through the electrolyte of the two electrodes having a large difference in ionization tendency, As shown in FIG.

The rechargeable battery industry is dominated by lead-acid batteries, but small-sized rechargeable batteries are only produced by lithium-ion rechargeable batteries. The market for lithium-ion rechargeable batteries, Ni-Cd and Ni-MH secondary batteries The paper is used for various purposes.

Lithium secondary battery has the highest unit cell voltage (3.0 ~ 3.7V) and high energy density among existing rechargeable battery systems, and has characteristics optimized for mobile devices due to high unit cell voltage. However, , And weakness before overdose.

A lithium ion battery is composed of a material capable of reversibly transferring lithium ions between an anode and a cathode. A battery is operated by an intercalation reaction, which is called a rocking chair battery or a shuttlecock battery because lithium ions alternate between an anode and a cathode as the battery is charged and discharged.

A constant current / constant voltage charger should be used to charge the lithium ion battery. The charger regulates the charging current so that the individual voltage of the battery can be charged to 4.2V. The lithium ion battery is charged with a constant current within a current range of 0.1C to 1.5C, and when the constant voltage condition is reached, the charging current gradually decreases to zero, thereby preventing overcharge of the battery.

 The charging / discharging device tests the manufactured secondary battery so that charging and discharging of the secondary battery can be repeated several times to confirm the performance of the secondary battery.

The conventional charge / discharge device charges the secondary battery by reducing the DC power. When the secondary battery is sufficiently charged, the discharging load and the secondary battery are energized to consume the charged electric energy.

However, in the conventional charge / discharge apparatus, a plurality of secondary batteries must be tested separately in practice, and a charging / discharging device corresponding to the number of secondary batteries to be tested is required. Of course, since the charge / discharge device constructed according to the number of secondary cells occupies a certain space, the space for disposing the charging / discharging device increases exponentially as the number of secondary cells increases.

 On the other hand, since the charge / discharge device discharges a considerable amount of heat during the charge / discharge process of the secondary battery, a heat dissipating device is individually installed for each charge / discharge device in order to remove generated heat. However, since the reinforcing installation of the heat dissipating device means an increase in the space occupied by the charging / discharging device, the number of secondary batteries that can be tested at a time under the conventional charging / discharging device has been practically limited.

In addition, since the elements constituting the charging / discharging device are dispersedly arranged in the conventional charging / discharging device once it is installed at a specific point, it is difficult to work by the elements arranged in a distributed manner when the charging / discharging device is moved, In addition, there is a problem that the management and utilization of the charge / discharge device becomes cumbersome and inconvenient because it is inadequate.

The technique which is the background of the present invention is described in Korean Patent Registration No. 10-0935686 (registered on Dec. 29, 2009).

Disclosure of Invention Technical Problem [8] The present invention provides a modular charging / discharging device for a charging / discharging test in a secondary battery process.

According to one embodiment of the present invention, there is provided a charge / discharge device for a charge / discharge test according to a secondary battery process, the device comprising: A control unit for receiving a command to control a test schedule and transmitting the data under test to the operating PC; A sensing unit for receiving at least one of the measured values of the charging current and the terminal voltage of the secondary battery, and comparing the measured value with a preset reference value; A charging unit for charging or discharging when the feedback measurement value reaches the reference value using the comparison result of the sensing unit to prevent overcharge or overdischarge; A relay unit receiving a control signal from the control unit and outputting a charging / discharging signal to the charging unit; Wherein the sensing unit, the charging unit, the relay unit, and the display unit are modularized into one module, and one or more modules corresponding to the number of the secondary batteries are formed on the main board, As shown in FIG.

The controller may communicate with the one or more modules via different channels, and may set the reference value for voltage and current through a D / A converter for each channel.

Also, the control unit may convert at least one of the feedback current and voltage value to an A / D converter.

In addition, the sensing unit may be provided in the form of a plurality of charge / discharge drivers configured for each channel for modular design.

The charging and discharging unit may include a charging circuit and a discharging circuit that separately perform charging and discharging and perform charging and discharging, respectively.

The charging and discharging unit may include a shunt resistor which is driven through a voltage level output from the sensing unit and whose feedback charging current value is measured.

Also, the relay unit may set a charge / discharge signal for each channel by using the I 2 C data transmitted from the control unit.

Also, the display unit may display the state of the control unit through an LED-type tower lamp using the general-purpose input / output terminal (GPIO) of the control unit.

According to the apparatus and method for diagnosing a state of a fuel cell stack according to the present invention, the respective components of the charge and discharge apparatus are modularized, thereby facilitating expansion of the equipment as the test secondary battery increases. In addition, by constituting one control unit communicating with the operating PC, it is possible to easily control charge / discharge of the secondary battery on a channel-by-channel basis.

1 is a configuration diagram of an overall charge / discharge system including a modular charge / discharge device according to an embodiment of the present invention.
FIG. 2 is a view for explaining control for each channel of the modular charge / discharge device according to the embodiment of the present invention.
3 is a block diagram of a control unit of a modular charge / discharge apparatus according to an embodiment of the present invention.
4 is a configuration diagram of a sensing unit of a modular charge / discharge device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a configuration diagram of an overall charge / discharge system including a modular charge / discharge device according to an embodiment of the present invention.

The charge / discharge system according to the embodiment of the present invention includes a modular charge / discharge device 100, an operating PC 200 for controlling the entire charge / discharge test, and a secondary battery 300 as a charge / discharge test object.

The modular charge and discharge apparatus 100 according to the embodiment of the present invention is configured for charging / discharging test of the secondary battery 300 during the manufacturing process. Here, as the number of the secondary cells 200 to be tested increases, the modularized charging and discharging apparatus 100 can be configured to easily expand the modularized components.

The operating PC 200 transmits a command for driving a test schedule for testing the secondary battery 200 to the modular charging and discharging apparatus 100. Here, the modular charging and discharging apparatus 100 can be connected to the operating PC 200 via a LAN and communicate with each other.

The secondary battery 300 is a battery to be subjected to charge / discharge test. The secondary battery capable of performing the charge / discharge test according to the embodiment of the present invention includes a lithium ion battery, a nickel-cadmium battery, a lead acid battery, and the like, and may include a secondary battery which may be developed in the future.

1, a modularized charging and discharging apparatus 100 according to an embodiment of the present invention includes a controller 110, a sensing unit 120, a charging unit 130, a relay unit 140, a display unit 150, And a power supply unit 160. Here, the components other than the control unit 110 may be modularized into one module. That is, one module may include a sensing unit 120, a charging unit 130, a relay unit 140, a display unit 150, and a power supply unit 160. 1 illustrates a case where one module is mounted on a main board in the case where the sensing unit 120, the charging unit 130, the relay unit 140, the display unit 150, and the power supply unit 160 are modularized FIG.

FIG. 2 is a view for explaining control for each channel of the modular charge / discharge device according to the embodiment of the present invention.

2, when the components other than the control unit 110 are modularized, the operating PC 200 and the control unit 110 are connected to each other by a LAN to perform a module-by-module test. The commands transmitted from the operating PC 200 can be delivered to the respective modules through the respective channels set for each module via the controller 110. [

In another configuration, one module may include other components except for the control unit 110, the display unit 150, and the power supply unit 160. [ In this case, each of the control unit 110, the display unit 150, and the power supply unit 160 is common to a plurality of modules. That is, the status display of the plurality of modules can be displayed through one display unit 150, and the secondary batteries included in the plurality of modules are connected to one power source unit 160 in parallel to be supplied with power.

3 is a block diagram of a control unit of a modular charge / discharge apparatus according to an embodiment of the present invention.

The controller 110 may include a micro control unit (MCU) unit including a central processing unit (CPU) and a digital circuit. Here, the digital circuit includes a D / A converter and an A / D converter.

The CPU (Central Processing Unit) is a main part of the charge / discharge device facility, and drives the charge / discharge device facility using the operating PC 200, MCU (Micro Control Unit), and extended communication module.

Specifically, the CPU receives a command from the operating PC 200, drives a secondary battery charge / discharge test schedule (Test Schedule) to be executed, collects data under test, and transmits the data to the operating PC 200.

The connection between the CPU and the digital circuit can be implemented by serial peripheral interface (SPI) communication. The MCU can set the conditions in the order of the test schedule received from the operating PC 200. [ In addition, the communication of the extended communication module can be configured by RS-232.

In addition, the CPU can directly control the status display of the charge / discharge device facility using the multipurpose input / output port (GPIO).

In MCU (Micro Control Unit), MCU circuit excluding CPU is command received from CPU and receives setting and voltage and current setting and feedback according to charge and discharge for each channel. Here, the charge and discharge settings are performed by transmitting data to the Relay Drive Board of the separately installed relay unit 140 to perform charging and discharging control for each channel. It may be implemented by I2C in the manner of the data to be transmitted.

3, the control unit 110 includes a D / A converter and an A / D converter for converting digital data and analog data.

MCU sets voltage and current through D / A converter. The communication method between the D / A converter and the MCU can be configured as SPI, and the bit rate can be designed to be 12 bits.

Voltage and current feedback can be received via A / D Converter. The communication between the A / D converter and the MCU can be composed of SPI, and the bit rate can be designed to be 16 bits.

An additional RS-232 port allows you to check the current status of the MCU.

Serial Peripheral Interface (SPI) is a circuit for communication compatibility between CPU and main board and stability of long distance communication.

In the CPU, data is transferred in Single Ended form, converted into Differential Data type, and transferred to MCU of main board.

The communication with the extended communication module can be implemented by the SM-Bus interface. The CPU converts RS-232 data into RS-485 format and transmits it to the SM-Bus module. It converts data to RS-485 form for long distance communication stabilization and parallel communication of n SM-Bus modules. Since the SM-Bus Interface needs to be output to the outside, it uses the communication exclusive connector (D-Sub 9pin).

The LAN driver is a circuit configured for LAN communication between the CPU and the operating PC 200. Extend I / O transfers the output of the CPU using the general purpose input / output (GPIO) of the CPU.

The configuration of the D / A converter circuit can be composed of three D / A converters (DAC7558) for setting voltage and current and a D / A converter (DAC8532) for offset correction. The DAC7558 can set voltage and current for 20 channels. One DAC7558 is composed of 8 ports, so a total of 24 D / A converter ports can be configured.

Here, the current setting can be individually set for each channel. In the voltage setting, 5 channels are connected to 1 port of D / A converter output, and 5 channels are driven with the same voltage condition.

The DAC8532 is designed to compensate for offsets in the circuit to reduce the error, which can sometimes be optinally operated.

The D / A output circuit can amplify the signal output from the D / A converter and set the voltage and current to the CHG-DCH Drive module of the sensing unit 120 configured for each channel. It is mounted in the meaning of buffer and can be used to attenuate noise by amplifying the signal of long distance.

The A / D converter circuit receives the voltage and current measured in the CHG-DCH Drive module of the sensing unit 120 and sequentially receives the voltage and current from the A / D converter using a multiplexer, and then transmits the data to the MCU Circuit. The reference voltage is applied to calculate the analog voltage level in D / A converter and A / D converter.

In addition, the Gain & Offset control circuit is a circuit for offsetting the circuit and correcting the amplification factor of each part, and optional operation is possible at times.

The A / D converter input circuit sequentially transmits the voltage and current measured by the CHG-DCH Drive module of the sensing unit 120 to the A / D converter circuit input using a multiplexer.

In addition, the MUX consists of eight ports, each of which measures voltage and current using three MUXs.

4 is a configuration diagram of a sensing unit of a modular charge / discharge device according to an embodiment of the present invention.

The sensing unit 120 receives at least one of the measured values of the charging current and the terminal voltage of the secondary battery 300 and compares it with a preset reference value. The sensing unit 120 may include a CHG-DCH Drive module and a V-Sensing module for current or voltage sensing.

The CHG-DCH Drive module converts the voltage and current into a voltage level that can be calculated from the A / D converter circuit by feedback. In addition, the CHG-DCH Drive module is a circuit that controls the constant voltage and constant current by comparing the voltage and current set by the D / A converter with the feedback voltage and current. And controls the charging unit 130 by the output of the CHG-DCH Drive module.

For the design, the CHG-DCH Drive module, which is configured for each channel, is mounted on the main board for modular design. The CHG-DCH Drive module can be used as an interface with the main board I / O, and can serve as a connector to interface with each part rather than the functional one.

The circuit of the charging unit 130 is a circuit for driving the actual output current. When the feedback measurement value reaches the reference value using the feedback measurement value of the sensing unit 120 and the reference value comparison result, the charging unit 130 can prevent the overcharge or overdischarge by completing the charging or discharging. Specifically, when the terminal voltage of the secondary battery is close to the reference value voltage at the time of charging or when the voltage of the secondary battery is close to the reference value voltage (discharge limit voltage) at the time of discharging, the amount of charging or discharging current Overcharge and overdischarge can be prevented.

 The charging unit 130 is basically a circuit designed to drive the transistor through the voltage level output from the CHG-DCH Drive module of the sensing unit 120. [

The charging unit 130 includes a charging circuit and a discharging circuit which are separated from each other. The charging and discharging are switched by receiving signals from the Relay Drive Board of the relay unit 140 by the MUX.

When the voltage of the load is low, the charging unit 130 can change the charging power through relay switching to reduce the heat generated in the transistor.

The shunt resistor connected to the negative terminal of the connector of the secondary battery 300 can measure the current by calculating the voltage generated across the resistor when the current flows.

The charging unit 130 includes a shunt resistor for measuring a value of a feedback charging current. That is, the voltage measured in the shunt resistance of the charging unit 130 is amplified according to the reference voltage circuit output voltage of the main board, and the amplified voltage is fed back to the CHG-DCH Drive module.

The relay unit 140 sets a charge / discharge signal for each channel using the I 2 C data transmitted from the control unit 110. That is, the MCU drives the relays of the separately installed relay unit 140 using I 2 C (Inter Integrated Circuit) communication. I2C designs can be configured with extra I2C drives. That is, the charging and discharging signals of a plurality of channels can be set by using the I 2 C data transmitted from the MCU of the main board. Charging and discharging of a plurality of channels can be set by using two extended general-purpose input / output terminals (GPIO).

The relay control circuit supplies the charging and discharging signals of the charging unit 130 through the output of the photo-coupler receiving unit. Depending on the circuit (MUX or Relay) connected to the relay control circuit, the amplification module can be used.

The relay driving terminal may be separately configured for switching the charging voltage of the charging unit 130, and five channels may be designed to operate simultaneously.

The display unit 150 may use an LED for status display. The LED PCB can display the states of charging, discharging, resting, goodness, fault etc. of each channel by LED. The LED indicating the state of the control unit 110 can be displayed by turning on the yellow LED in the non-operating state, the green LED in the active state, or the red LED when there is an error, depending on the state of the main board. A tower lamp can be used to implement this.

The circuit of the power supply unit 160 may be composed of a main power supply circuit, a charging power supply circuit, and a system driving power supply circuit. The charging power supply circuit is composed of +20 V and +12 V, and can be designed to be capable of switching power from the charging unit 130.

Further, the power supply unit 160 converts + 5V to + 3.3V to supply the CPU digital circuit.

As described above, the modularized charging and discharging apparatus according to the embodiment of the present invention modularizes each constituent element of the charging and discharging apparatus, thereby facilitating expansion of the equipment as the number of test secondary batteries increases. In addition, by constituting one control unit communicating with the operating PC, it is possible to easily control charge / discharge of the secondary battery on a channel-by-channel basis.

The present invention has been described above with reference to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims and equivalents thereof.

100: a modular charge / discharge device, 110: a control section,
120: sensing part, 130: charging part,
140: Relay unit, 150: Display unit,
160: power supply unit, 200: operating PC,
300: secondary battery

Claims (8)

A charge / discharge device for a charge / discharge test according to a secondary battery process,
A control unit for receiving a command related to the test from the operating PC to control a test schedule, and transmitting the data under test to the operating PC;
A sensing unit for receiving at least one of the measured values of the charging current and the terminal voltage of the secondary battery,
A charging unit for charging or discharging when the feedback measurement value reaches the reference value using the comparison result of the sensing unit to prevent overcharge or overdischarge;
A relay unit receiving a control signal from the control unit and outputting a charging / discharging signal to the charging unit; And
And a display unit for displaying a control state according to the control unit,
The sensing unit, the charging unit, the relay unit, and the display unit are modularized into one module, and one or more modules corresponding to the number of the secondary batteries can be detachably attached to the connector formed on the main board,
Wherein,
Wherein the control unit communicates with the at least one module through different channels, sets the reference value for voltage and current through a D / A converter for each channel, and transmits at least one of the feedback current and voltage values through an A / Conversion,
The sensing unit includes:
A modular charge / discharge device comprising a plurality of charge / discharge drivers configured for each channel for modular design. delete delete delete The method according to claim 1,
The charge /
A charging / discharging device comprising a charging circuit and a discharging circuit which perform charging and discharging separately from each other. The method according to claim 1,
The charge /
A sensing unit driven by a voltage level output from the sensing unit,
And a shunt resistor for measuring the feedback charge current value. The method according to claim 1,
The relay unit includes:
Wherein the charging / discharging signal is set for each channel by using the I2C data transmitted from the controller. The method according to claim 1,
The display unit includes:
Wherein the state of the control unit is displayed through an LED-type tower lamp using a general-purpose input / output terminal (GPIO) of the control unit.

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