KR102628666B1 - Apparatus for Equalizing Charge of Lead Storage Battery and Equalizing Charge Method Using the Same - Google Patents

Abstract

An equalizing charging device for lead acid batteries is provided. This equalization charging device for lead-acid batteries includes a charging section that provides direct current power for charging the lead-acid battery module with commercial AC power provided from the AC power section, a voltage equalization section for performing equal charging of the lead-acid battery module, and a charging section and voltage equalization. It includes a control unit that controls the unit through pulse width modulation. A lead acid battery module consists of four or more battery cells, and the battery cells have a connection structure of 2 in series n parallel (where n is a natural number of 2 or more).

Description

Equalizing Charge of Lead Storage Battery and Equalizing Charge Method Using the Same}

The present invention relates to an equalizing charging device for lead-acid batteries, and more specifically, to an equalizing charging device for lead-acid batteries that can dramatically extend the life of lead-acid battery modules used in military equipment and manage their performance at the best level, and the same. It relates to the equal charging method used.

As environmental destruction and resource depletion become problems, interest in systems that can store power and utilize the stored power efficiently is increasing.

The power storage system can store power generated from new and renewable energy in a battery, or store power from the commercial system in a battery in connection with the commercial system. The power storage system can supply power stored in a battery to a commercial grid or load.

A secondary battery capable of charging and discharging may be used in the power storage system to store power. Typically, secondary batteries are batteries that can be charged and discharged, unlike primary batteries that cannot be recharged. Secondary batteries may be used in the form of a single battery, depending on the type of external device to which they are applied, or in the form of a battery module in which multiple batteries are connected to form a single unit.

In general, lead-acid batteries (or lead storage batteries), Ni-Cd batteries, and nickel-metal hydride (Ni-MH) batteries have been widely used as small-sized secondary batteries. Recently, the development of portable and wireless electronic products has been increasing. Considering the increasing trend, the need for secondary batteries with high energy density is emerging to make these products smaller and lighter, and as interest in environmental conservation increases, interest in environmentally friendly products is also growing. It's getting higher.

At this time, much research is being conducted to control the battery system to effectively perform charging and discharging operations.

Republic of Korea Patent No. 10-0468127

The problem to be solved by the present invention is to provide a uniform charging device for lead acid batteries that can dramatically extend the life of lead acid battery modules used in military equipment and manage performance at the best level.

In addition, another problem that the present invention aims to solve is to dramatically extend the lifespan of lead-acid battery modules used in military equipment, and to provide a uniform charging method using a uniform charging device for lead-acid batteries that can manage performance at the best level. There is something to do.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above-described problem, the present invention provides an equal charging device for lead acid batteries. This equalization charging device for lead-acid batteries includes a charging section that provides direct current power for charging the lead-acid battery module with commercial AC power provided from the AC power section, a voltage equalization section for performing equal charging of the lead-acid battery module, and a charging section and voltage equalization. It may include a control unit that controls the unit through pulse width modulation. A lead acid battery module is composed of four or more battery cells, and the battery cells may have a connection structure of 2 series n parallel (where n is a natural number of 2 or more).

The charging unit, voltage equalization unit, and lead-acid battery module can be electrically connected to the generator of the applied equipment. Applicable equipment may be military equipment.

The charging unit includes a first protection circuit for filtering the commercial AC power provided from the AC power unit, an AC-DC converter for converting the commercial AC power filtered by the first protection circuit into DC power, and a DC converted by the AC-DC converter. An LCD resonant half-bridge converter that converts the output voltage of a power supply, a synchronous rectifier that determines the polarity of the DC power whose output voltage has been converted and rectifies the DC power whose output voltage has been converted, and a DC power rectified by the synchronous rectifier. It may include a second protection circuit for filtering.

The charging unit may include an auxiliary power source for supplying power to the control unit by receiving direct current power from the DC-AC converter.

The control unit may control the LCD resonant half-bridge converter of the charging unit, the synchronous rectifier unit, and the voltage equalization unit through pulse width modulation.

The control unit can receive feedback of voltage and current values from the lead acid battery module.

The control unit may include a status display unit that displays the status of the lead acid battery module.

In addition, in order to achieve the above-mentioned other problems, the present invention provides a method of equalizing charging of a lead acid battery using an equalizing charging device. This equal charging method is a lead-acid battery module in which four or more battery cells are configured to have a connection structure of 2 in series n parallel (where n is a natural number of 2 or more), and when commercial AC power provided from the AC power unit is applied, the battery charges for a predetermined period of time. Performing soft start-up maintaining the minimum charging current; After soft start-up is performed, performing constant current charging with the maximum charging current until the set charging voltage is reached; After reaching the set charging voltage, maintaining the charging voltage In one state, performing constant voltage charging until the charging current approaches the minimum charging current; blocking the charging current when the charging current approaches the minimum charging current; equalizing when the voltage difference between battery cells connected in series is greater than a set value It may include performing floating charging when the voltage of each of the battery cells is below a set value, and terminating charging when the voltage of each of the battery cells is above the set value.

The minimum charging current is 6.0 to 9.0A, and the predetermined time may be 30 seconds.

The set charging voltage ranges from 28.3 to 29.5V, and the maximum charging current can be 30.0A ± 10%.

The set value of the voltage difference between battery cells connected in series may be in the range of 0.1 to 1.0V.

The set value of the voltage of each battery cell may be 26.0V.

In addition, in order to achieve the above-mentioned other problems, the present invention provides another equalizing charging method using a equalizing charging device for a lead acid battery. This equal charging method involves starting charging of the lead acid battery module from the generator of the applicable equipment in a lead acid battery module configured to have 4 or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more). It may include performing equalization when the set voltage difference between battery cells connected in series is greater than a set value, and terminating charging of the lead acid battery module from the generator.

Charging of the lead-acid battery module from the generator begins when the voltage of each battery cell of the lead-acid battery module is above 27V, which is the generator charging set voltage, using the generator in a situation where the charging unit is electrically disconnected from the AC power supply. Using the power of the power source, the control unit may control the voltage equalization unit to turn the control power “on” to perform equal charging for the lead acid battery module.

If the set voltage difference between battery cells connected in series is greater than a set value, equalization may be performed. If the set voltage difference between battery cells of the lead acid battery module is greater than a set value, equalization may be performed.

Terminating the charging of the lead-acid battery module from the generator means that when the voltage of each battery cell of the lead-acid battery module is less than 27V, which is the generator charging voltage set voltage, the control unit turns the control power "off" to end equal charging of the lead-acid battery module. “It could be.

As described above, according to the means for solving the problem of the present invention, a lead acid battery module configured to have four or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more), a commercial alternating current (Alternating Current) battery module : A charging unit that provides Direct Current (DC) power to charge the lead-acid battery module with AC) power (abbreviated as 'phase power'), a voltage equalization unit to perform equal charging of the lead-acid battery module, and a charging unit. And by including a control unit that controls the voltage equalization unit through pulse width modulation (PWM), a lead acid battery module consisting of four or more battery cells can be equally charged. Accordingly, an equal charging device for lead acid batteries that can dramatically extend the life of lead acid battery modules used in military equipment and manage performance at the best level can be provided.

In addition, according to the means for solving the problem of the present invention, in the lead acid battery module configured to have 4 or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more), when commercial AC power is applied, soft start ( performs soft start, performs constant current charging, performs constant voltage charging, performs equalization if the voltage difference between battery cells connected in series is greater than the set value, and performs balancing if the voltage of each battery cell is less than the set value. By including performing floating charging, a lead acid battery module consisting of four or more battery cells can be equally charged. Accordingly, a uniform charging method using a uniform charging device for lead acid batteries can be provided that can dramatically extend the lifespan of lead acid battery modules used in military equipment and manage performance at the best level.

As a result, the replacement cycle of lead-acid battery modules used in military equipment can be extended, thereby reducing costs and dramatically improving the availability of military equipment due to poor engine startability in winter. , and when operating military equipment using lead-acid battery modules between the above-mentioned readiness and training, serious risks such as reduced engine life, fuel consumption, air pollution, noise, etc. of military equipment due to idling engine operation for charging of lead-acid battery modules. A uniform charging device for a lead acid battery that can completely solve the problem and a uniform charging method using the same can be provided.

1 is a schematic block diagram illustrating an equal charging device for a lead acid battery according to an embodiment of the present invention.
Figure 2 is a schematic circuit diagram illustrating an equal charging device for a lead acid battery according to an embodiment of the present invention.
Figure 3 is a graph for explaining a method of equalizing charging of a lead acid battery according to an embodiment of the present invention.
Figure 4 is a block flow diagram illustrating a method of equalizing charging of a lead acid battery according to an embodiment of the present invention.
Figure 5 is a block flow diagram for explaining another equal charging method of a lead acid battery according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in different forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art, and the invention is defined only by the scope of the claims.

The same reference numerals refer to the same elements throughout the specification. Accordingly, the same or similar reference signs may be described with reference to other drawings even if they are not mentioned or described in the corresponding drawings. Additionally, even if reference signs are not indicated, description may be made with reference to other drawings.

The terminology used herein is for describing embodiments and is not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, 'comprises' and/or 'comprising' refers to the presence of one or more other components, steps, operations and/or devices. or does not rule out addition. Additionally, since this is according to a preferred embodiment, reference signs presented according to the order of description are not necessarily limited to that order.

An element is said to be 'connected to' or 'coupled to' another element when it is directly connected to or combined with another element, or with another element in the middle. Includes all cases intervening. On the other hand, when one component is referred to as 'directly connected to' or 'directly coupled to' another component, it indicates that there is no intervening other component. 'And/or' includes each and all combinations of one or more of the mentioned items.

Spatially relative terms such as 'below', 'beneath', 'lower', 'above', and 'upper' are used as a single term as shown in the drawing. It can be used to easily describe the correlation between devices or components and other devices or components. Spatially relative terms should be understood to include different orientations of the device during use or operation in addition to the orientation shown in the drawings. For example, if a device shown in the drawings is turned over, a device described as 'below' or 'beneath' another device may be placed 'above' the other device. Accordingly, the illustrative term 'down' may include both downward and upward directions. The device may also be oriented in other directions, so spatially relative terms may be interpreted according to the orientation.

Additionally, embodiments described in this specification will be described with reference to cross-sectional views and/or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Accordingly, the form of the illustration may be modified depending on manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in form produced according to the manufacturing process. Accordingly, the regions illustrated in the drawings have schematic properties, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and are not intended to limit the scope of the invention.

1 is a schematic block diagram for explaining an equal charging device for a lead acid battery according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram for explaining an equal charging device for a lead acid battery according to an embodiment of the present invention. This is a schematic circuit diagram.

Referring to Figures 1 and 2, the equalization charging device for a lead acid battery may include a charging unit 110, a control unit 120, a voltage equalization unit 130, a status display unit 140, and a lead acid battery module 150. .

The charging unit 110 of the equal charging device for a lead storage battery of the present invention may be electrically connected to the AC power unit 100 that provides commercial AC power for charging the lead storage battery module 150.

The AC power unit 100 can provide commercial AC power to the charging unit 110. That is, the AC power unit 100 can provide commercial AC power of 220V to the charging unit 110.

The charging unit 110 may serve to provide direct current power for charging the lead acid battery module 150 with commercial AC power provided from the AC power unit 100.

The charging unit 110 includes a first protection circuit 111, an AC-DC converter 112, and an inductor-inductor-capacitor (LLC) resonant half-bridge converter 113. ), a synchronous rectification unit 114, and a second protection circuit 115.

The first protection circuit 111 may be for filtering commercial AC power provided from the AC power unit 100. That is, the first protection circuit 111 may be an alternating current filter.

The AC-DC converter 112 may convert commercial AC power filtered by the first protection circuit 111 into DC power.

The LCD resonant half-bridge converter 113 can convert the output voltage of the DC power converted by the AC-DC converter 112. The LCD resonant half-bridge converter 113 may be used to minimize power loss and harmonic noise due to overlap of switching current and voltage by shifting the phases of voltage and current.

The synchronous rectifier 114 can rectify the DC power whose output voltage has been converted by determining the polarity of the DC power whose output voltage has been converted by the LLC resonant half-bridge converter 113. The synchronous rectifier 114 performs a rectification function in synchronization with the power conversion frequency using a field-effect transistor (FET) power semiconductor with very low power loss compared to a typical rectifier, thereby greatly reducing heat loss and achieving high It can be reliable.

The second protection circuit 115 may be used to filter the direct current power rectified by the synchronous rectifier 114. That is, the second protection circuit 115 may be a direct current filter.

The charging unit 110 may include an auxiliary power source 116 for receiving direct current power from the DC-AC converter 112 and supplying power to the control unit 120 . Here, the auxiliary power supply 116 may have various output voltages such as 12V, 5V, 3.3V, and 1.8V.

The control unit 120 may control the charging unit 110 and the voltage equalization unit 130 through pulse width modulation. More specifically, the control unit 120 may control the LLC resonant half-bridge converter 113, the synchronous rectifier 114, and the voltage equalization unit 130 of the charging unit 110 through pulse width modulation.

Additionally, the control unit 120 may receive feedback of voltage and current values from the lead acid battery module 150. That is, the control unit 120 may control the voltage equalization unit 130 based on the voltage value and current value fed back from the lead acid battery module 150.

The control unit 120 may be configured to operate when the voltage of each battery cell of the lead acid battery module 150 is 27V or higher in order to minimize natural discharge of the lead acid battery module 150.

The control unit 120 may include a microcontroller unit (MCU).

The voltage equalization unit 130 may be used to perform equal charging of the lead acid battery module 150. The voltage equalization unit 130 may perform equalization when the voltage difference between battery cells connected in series of the lead acid battery module 150 is greater than or equal to a set value.

The status display unit 140 may be used to display the status of the lead acid battery module 150 by the control unit 120. The status display unit 140 may be composed of two or more lamps. The lamp may be a light-emitting diode (LED).

The lead acid battery module 150 may be composed of four or more battery cells. And the battery cells may have a 2 series n parallel (where n is a natural number greater than or equal to 2) connection structure (2SnP). Here, the battery cell may have an output voltage of 12V.

Accordingly, the charging unit 110, the control unit 120, and the voltage equalization unit 130, which are electrically connected to the AC power unit 100, use commercial AC power to set each of the battery cells of the lead acid battery module 150 to a set charging voltage. It can be charged equally. At this time, the set charging voltage may be in the range of 28.3 to 29.5V.

As shown, the generator 160 of the application equipment may be electrically connected to the charging unit 110, the voltage equalization unit 130, and the lead acid battery module 150. Applicable equipment may be military equipment. Here, the control unit 120 can equalize the lead acid battery module 150 using the generator 160 in a situation where the charging unit 110 is electrically disconnected from the AC power supply unit 100. That is, in a situation where the charging unit 110 is electrically disconnected from the AC power supply unit 110, the control unit 120 electrically connected to the generator 160 sets the voltage of each battery cell of the lead acid battery module 150 to the generator charging set voltage. When the voltage is above 27V, equalization is performed to perform equal charging to the lead acid battery module 150 by controlling the voltage equalization unit 130 using the power of the generator 160 or the auxiliary power source 116, and the lead acid battery module 150 When the voltage of each battery cell of the module 150 is less than 27V, which is the generator charging set voltage, equal charging of the lead acid battery module 150 may be terminated.

Accordingly, the equal charging device for lead acid batteries according to an embodiment of the present invention can be operated even in situations where commercial AC power is not provided.

In addition, the load 170 of military equipment may be electrically connected to the charging unit 110, the voltage equalization unit 130, and the lead acid battery module 150. Here, the load 170 may be a hydraulic motor of military equipment, etc.

The equal charging device for a lead acid battery according to an embodiment of the present invention can be operated even while charging the lead acid battery without operating the engine of military equipment.

The equal charging device for a lead-acid battery according to an embodiment of the present invention includes a lead-acid battery module configured to have four or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more), and a lead-acid battery module as a commercial AC power source. It consists of four or more battery cells by including a charging unit that provides direct current power for charging, a voltage equalization unit to perform equal charging of the lead acid battery module, and a control unit that controls the charging unit and the voltage equalization unit through pulse width modulation. Lead acid battery modules can be equally charged. Accordingly, an equal charging device for lead acid batteries that can dramatically extend the life of lead acid battery modules used in military equipment and manage performance at the best level can be provided.

FIG. 3 is a graph illustrating a method of equalizing charging of a lead acid battery according to an embodiment of the present invention, and FIG. 4 is a block flow diagram illustrating a method of equalizing charging of a lead acid battery according to an embodiment of the present invention.

Referring to Figures 3 and 4, the equal charging method of a lead acid battery includes charging start (S110), continuous start (S120), constant current charging (S130), constant voltage charging (S140), cut-off (S150), It may include equalization (S160), float charge (S170), and charge termination (S180).

Here, the lead-acid battery module (see 150 in FIG. 1 or FIG. 2) of the equal charging device for lead-acid batteries may be configured to have 4 or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more). .

Charging start (S110) can be accomplished by connecting the AC power unit (see 100 in FIG. 1 or FIG. 2) and the equalizing charging device for the lead acid battery.

At this time, when commercial AC power is provided to the charging unit (see 110 in FIG. 1) by the AC power unit, the equalizing charging device for the lead acid battery can start charging the lead acid battery module.

When charging of the lead-acid battery module of the lead-acid battery equalizing charging device begins, the first lamp L1 among the lamps constituting the status display unit (see 140 in FIG. 1) of the lead-acid battery equalizing charging device lights up in green. It can be displayed that charging has started.

The soft start (S120) may be to maintain the minimum charging current for a predetermined period of time when commercial AC power is applied to the equalizing charging device for the lead acid battery. The minimum charging current is 6.0 to 9.0A, and the predetermined time may be 30 seconds. When continuous start-up (S120) of the equalizing charging device for a lead-acid battery is performed, the second lamp (L2) among the lamps constituting the status display unit of the equalizing charging device for a lead-acid battery lights up in yellow to indicate the continuous starting (S120) state. can be displayed.

Constant current charging (S130) is performed after soft start (S120) is performed, and the battery cells of the lead-acid battery module of the lead-acid battery equalizing charging device are charged with the maximum charging current until each of the battery cells of the lead-acid battery module reaches the set charging voltage. It may be charging at a constant current for the lead acid battery module. The set charging voltage may be 28.8V. The set charging voltage may vary depending on the ambient temperature of the equalizing charging device for lead acid batteries and may range from 28.3 to 29.5 V. And the maximum charging current can be 30A ± 10%. When constant current charging (S130) for the equal charging device for a lead acid battery is performed, the second lamp (L2) among the lamps constituting the status display unit for the equal charging device for a lead acid battery lights up in yellow to indicate the constant current charging (S130) state. can be displayed.

Constant voltage charging (S140) is performed after each battery cell of the lead-acid battery module of the lead-acid battery equalizing charging device reaches the set charging voltage, and then charges at a constant voltage while maintaining the charging voltage until the charging current approaches the minimum charging current. It may be. When constant voltage charging (S140) is performed for the equalizing charging device for a lead-acid battery, the second lamp (L2) among the lamps constituting the status display unit of the equalizing charging device for the lead-acid battery lights up in yellow to indicate the constant voltage charging (S140) state. can be displayed.

Cutoff (S150) may be to block the charging current when the charging current for each of the battery cells of the lead-acid battery module of the equal charging device for lead-acid battery approaches the minimum charging current. At this time, the value of the charging current close to the minimum charging current may be 6.0 to 9.0. When the equal charging device for the lead acid battery is blocked (S150), the second lamp (L2) among the lamps constituting the status display unit of the equal charging device for the lead acid battery is turned off and the charging current is blocked (S140). can be displayed.

Equalization (S160) is performed when the voltage difference between battery cells connected in series among the battery cells of the lead-acid battery module of the lead-acid battery equalization charging device is greater than a set value, the voltage equalization unit (see 130 in FIG. 1) equalizes the lead-acid battery charging device. It may be performing equalization on the storage battery module. The set voltage difference between battery cells connected in series may be in the range of 0.1 to 1.0V. When equalization (S160) for the equalization charging device for lead-acid batteries is performed, the second lamp (L2) among the lamps constituting the status display of the equalization charging device for lead-acid batteries blinks in yellow to indicate that it is in the equalization (S160) state. It can be displayed.

Here, equalization (S160) may be active voltage equalization between battery cells connected in series rather than passive voltage equalization.

Floating charging (S170) may be performed when the voltage of each battery cell of the lead-acid battery module of the equal charging device for lead-acid battery is less than the floating charging voltage value. The floating charge voltage value of each of the battery cells of the lead acid battery module of the equal charging device for lead acid batteries may be 26.0V. When floating charging (S170) is performed for the equalizing charging device for a lead-acid battery, the second lamp (L2) among the lamps constituting the status display unit of the equalizing charging device for the lead-acid battery lights up in yellow to indicate the floating charging (S170) state. can be displayed.

Charging termination (S180) can be accomplished by disabling the AC power unit and the equalizing charging device for the lead-acid battery when the voltage of each battery cell of the lead-acid battery module of the equalizing charging device for the lead-acid battery has a set value. Accordingly, charging and equalization of the lead acid battery module of the equalization charging device for the lead acid battery may be completed. When the charging termination (S180) for the equal charging device for the lead acid battery is performed, the first lamp (L1) and the second lamp (L2) among the lamps constituting the status display unit of the equal charging device for the lead acid battery are turned off and charged. It can be displayed that it is in a finished (S170) state.

Figure 5 is a block flow diagram for explaining another equal charging method of a lead acid battery according to an embodiment of the present invention.

Referring to Figure 5, another equalization charging method of a lead acid battery includes starting charging (S210) of a lead acid battery module (see 150 in Figure 1 or 2) from the generator of the applied equipment (see 160 in Figure 1 or 2), equalization ( S220) and termination of charge of the lead acid battery module from the generator (S230).

Starting charging of the lead acid battery module from the generator (S210) occurs when the charging unit (see 110 in FIG. 1) is electrically disconnected from the AC power unit (see 100 in FIG. 1 or 2) and the generator (see 160 in FIG. 1 or 2). When the voltage of each battery cell of the lead acid battery module is 27V or higher, which is the generator charging set voltage, the control unit (see 120 in FIG. 1) uses the power of the generator or auxiliary power source (see 116 in FIG. 1) to equalize the voltage. (see 130 in FIG. 1) can be controlled to turn the control power “on” to perform equal charging for the lead acid battery module.

At this time, the first lamp (L1) of the lamps constituting the status display unit (see 140 in FIG. 1) of the equal charging device for the lead acid battery lights up in green to indicate that charging of the lead acid battery module has started. .

Equalization (S220) may be performed when the set voltage difference between battery cells of the lead acid battery module is greater than or equal to a set value.

At this time, the second lamp L2 among the lamps constituting the status display unit of the equalization charging device for the lead acid battery may blink in yellow to indicate that it is in a state of equalization (S220) by the generator.

Termination of charge of the lead acid battery module from the generator (S230) is when the voltage of each battery cell of the lead acid battery module is less than 27V, which is the generator charging voltage set voltage, the control unit turns the control power "off" to end equal charging of the lead acid battery module. can do.

At this time, among the lamps constituting the status display unit of the equal charging device for lead acid batteries, the first lamp (L1) and the second lamp (L2) blink in green and yellow, respectively, to indicate that charging of the lead acid battery module by the generator has been completed. Status can be displayed.

The equal charging method of a lead acid battery according to an embodiment of the present invention is a lead acid battery module configured to have 4 or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more), where commercial AC power is applied. If the voltage difference between battery cells connected in series is above a set value, equalization is performed, and if the voltage of each battery cell is below the set value, floating charging is performed. By including this, a lead acid battery module consisting of four or more battery cells can be equally charged. Accordingly, a uniform charging method using a uniform charging device for lead acid batteries can be provided that can dramatically extend the lifespan of lead acid battery modules used in military equipment and manage performance at the best level.

In addition, another equal charging method of a lead acid battery according to an embodiment of the present invention is a lead acid battery module configured to have 4 or more battery cells connected in 2 series n parallel (where n is a natural number of 2 or more), wherein the charging unit In a situation where the electrical connection with the AC power supply is lost, starting charging of the lead-acid battery module from the generator of the applied equipment, performing equalization if the set voltage difference between battery cells connected in series is greater than the set value, and charging the lead-acid battery from the generator By including terminating charging of the module, a lead acid battery module consisting of four or more battery cells can be equally charged. Accordingly, another equal charging method for a lead acid battery according to an embodiment of the present invention may be operable even in situations where commercial AC power is not provided.

Above, embodiments of the present invention have been described with reference to the attached drawings, but those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical idea or essential features. You will understand that it exists. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

100: AC power unit
110: charging part
111, 115: first and second protection circuits
112: AC-DC converter
113: LLC resonant half-bridge converter
114: synchronous rectification unit
116: Auxiliary power unit
120: control unit
130: Voltage equalization unit
140: Status display unit
150: Lead acid battery module
160: generator
170: load

Claims (5)

A charging unit that provides direct current power for charging the lead acid battery module with commercial AC power provided from the AC power unit;
A voltage equalization unit for performing equal charging of the lead acid battery module; and
A generator electrically connected to the charging unit, voltage equalization unit, and lead acid battery module;
A control unit that receives voltage and current feedback from the lead storage battery module and controls the charging unit and the voltage equalization unit through pulse width modulation based on the feedback received voltage and current,
The charging part,
An AC filter for filtering the commercial AC power provided from the AC power unit, an AC-DC converter for converting the commercial AC power filtered by the AC filter into the DC power, and the DC power from the AC-DC converter. an auxiliary power supply for supplying power to the control unit, an LLC resonant half-bridge converter for converting the output voltage of the direct current power converted by the AC-DC converter, and the direct current into which the output voltage is converted. It includes a synchronous rectifier for determining the polarity of the power supply and rectifying the DC power whose output voltage has been converted, and a DC filter for filtering the DC power rectified by the synchronous rectifier,
The lead acid battery module is composed of four or more battery cells, and the battery cells have a connection structure of 2 series n parallel (where n is a natural number of 2 or more),
When the charging unit is electrically disconnected from the AC power unit, the control unit receives power from the generator or an auxiliary power source and controls the voltage equalization unit, where the voltage of each battery cell of the lead acid battery module is used to charge the generator. If the voltage is higher than the set voltage, the control power for performing equal charging of the lead acid battery module is turned on, and if the voltage of each battery cell of the lead acid battery module is less than the charging set voltage of the generator, equal charging of the lead acid battery module is performed. A device for equalizing charge of lead-acid batteries that turns off the control power to terminate. delete delete According to clause 1,
Equal charging device for a lead-acid battery including a status display unit that displays the status of the lead-acid battery module by the control unit. In the lead acid battery module configured to have 4 or more battery cells connected in a 2 series n parallel (where n is a natural number of 2 or more) connection structure,
When commercial AC power provided from the AC power unit is applied to a charging unit electrically connected to the AC power unit, the charging unit performs a soft start to maintain 6.0 to 9.0 A for 30 seconds;
After the soft start is performed, performing constant current charging at 30A ± 10% until a charging voltage of 28.3 to 29.5V is reached in the charging unit;
After reaching 28.3 ~ 29.5V, performing constant voltage charging while maintaining the above charging voltage until the charging current approaches 6.0 ~ 9.0A;
blocking the charging current when the charging current approaches 6.0 to 9.0A;
If the voltage difference between the battery cells connected in series is 0.1 to 1.0 V or more, equalization is performed in the voltage equalization unit;
Performing floating charging when the voltage of each of the battery cells is less than 27.0V;
Including terminating charging when the voltage of each of the battery cells is 27.0V or higher,
The control unit controls the charging unit and the voltage equalization unit, and when the charging unit is electrically disconnected from the AC power unit, the control unit receives power from a generator electrically connected to the charging unit, the voltage equalization unit, and the lead acid battery module. Controls the voltage equalization unit, and if the voltage of each of the battery cells of the lead acid battery module is 27.0V or more, turns on the control power to perform equal charging of the lead acid battery module, and each of the battery cells of the lead acid battery module An equalizing charging method using a equalizing charging device for a lead-acid battery that turns off the control power to end equalizing charging of the lead-acid battery module when the voltage of the generator is less than 27.0V.

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