KR20090026645A - Secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery, and by connecting the photovoltaic cell assembly in parallel with the storage cell assembly, the secondary battery can be secured, and the secondary battery can be stably supplied to the electronic device by charging without an external power source. It is about.

The present invention is characterized by a secondary battery having a battery assembly comprising a battery assembly and a photovoltaic assembly connected in parallel with the battery assembly.

In addition, the battery assembly of the present invention is characterized in that the secondary battery having a zener diode between the battery assembly and the photovoltaic cell assembly.

Therefore, by providing a photovoltaic cell assembly that converts solar energy into electrical energy in addition to the battery cell assembly used through charging by an external power source, it is possible to secure an extra power supply and to charge without an external power source, thereby enhancing user convenience. It is possible to supply stable power to electronic equipment.

Description

Secondary battery

The present invention relates to a secondary battery, and by connecting the photovoltaic cell assembly in parallel with the storage cell assembly, the secondary battery can be secured, and the secondary battery can be stably supplied to the electronic device by charging without an external power source. It is about.

The use of portable electronic devices, such as notebooks, portable phones, PDAs, etc., is rapidly becoming popular, and as more and more functions are supported, power consumption is also increasing.

Most portable electronic devices use a rechargeable battery that can be charged and discharged as a driving power source. However, the difference is increasing because the technology of the secondary battery is slowly developing as compared with an increase rate of power demand.

Among the rechargeable batteries, lithium secondary batteries have an operating voltage of 3.6V or more, which is three times higher than nickel-cadmium batteries or nickel-hydrogen batteries widely used as power sources for portable terminals, and has a high energy density per unit weight. The trend is growing.

However, when the lithium secondary battery is charged to 4.5V or more, the internal pressure of the battery is increased by the gas generated while the electrolyte inside the battery is decomposed, which may involve leakage of the electrolyte. In addition, when the battery is discharged below a certain voltage, copper, which is a current collector of the negative electrode, begins to melt into the electrolyte, thereby degrading the performance of the battery.

In addition, there is a problem in that the risk of ignition, rupture and explosion in the overcurrent situation due to overcharge, overdischarge, or short between terminals due to the chemical characteristics of the battery is large.

Therefore, the secondary battery includes a protection circuit module together with a bare cell. The bare cell houses an electrode assembly consisting of a positive electrode, a negative electrode, and a separator in a can made of steel, aluminum, etc., and closes the can with a cap assembly. It is formed by injecting and sealing an electrolyte solution into the can.

The protection circuit module is to secure safety and reliability by preventing safety accidents caused by overcharging, overdischarging, overcurrent, etc. of the secondary battery. After the formation of the bare cell, the protection circuit module is electrically connected to the outside of the bare cell.

The protective circuit module includes a protective circuit element and an electrode terminal on one side of a printed circuit board on which a wiring pattern is formed, and an external connection terminal for connecting to a terminal adopting a secondary battery on the other side. The bare cell is connected to each other by a positive lead plate and a negative lead plate connecting the positive / cathode terminals of the printed circuit board and the positive / cathode terminals of the bare cell.

Secondary batteries are used in a portable terminal by labeling the gap between the bare cell and the protective circuit module after resin molding or forming a battery pack having an external case in a state in which the bare cell and the protective circuit module are connected.

1 is a circuit diagram of an example of the structure of a conventional secondary battery, and the secondary battery includes a charge / discharge element portion 12 including a battery 11, a charging element, and a discharge element, a temperature fuse 13, and a fuse 14; And an external port 15, a primary protection circuit 16, a secondary protection circuit 17, and a sensor resistor 18.

Referring to FIG. 1, in the conventional secondary battery configured as described above, an external power supply or load is connected through an external port 15 to perform a charging or discharging operation. The path between the battery 11 and the external port 15 is a large current path used as a charge / discharge path, and a relatively large current flows through the large current path.

When the power supply is connected to the external port 15, a charging operation occurs, and the charging path is connected to the battery 11 via the external port 15, the charging element, the thermal fuse 13, and the fuse 14. .

On the other hand, when the load is connected to the external port 15, the discharge operation occurs, the discharge path through the battery 11, the fuse 12, the thermal fuse 13, the discharge element, the external port 15 Leads to load.

That is, the charging and discharging element unit 12 alternately operates the charging element or the discharge element according to the charging or discharging mode.

The battery 11 outputs various kinds of information therein, that is, cell related information such as the temperature of the cell, the charging potential of the cell and the current flowing through the cell, to the primary and secondary protection circuits 16 and 17, The sensor resistor 18 senses overcharge or overdischarge and overcurrent generation and transmits it to the primary and secondary protection circuits 16 and 17.

The primary protection circuit 16 controls the charge / discharge element unit 12 according to the cell related information provided from the battery 11 and the information sensed from the sensor resistor 18, and the secondary protection circuit 17 is The fuse 14 is controlled according to the cell related information provided from the battery 11 and the information sensed by the sensor resistor 18.

The thermal fuse 13 detects a temperature state of the charge / discharge element unit 12 and cuts both ends when the temperature is higher than the rated temperature, thereby preventing the charge / discharge element unit 12 from igniting, burning or exploding due to an abnormal phenomenon. do.

In the conventional secondary battery configured as described above, once discharged, no further use is possible unless there is no external power source for charging or a separate charging device such as a charger is provided.

The present invention is characterized by a secondary battery having a battery assembly comprising a battery assembly and a photovoltaic assembly connected in parallel with the battery assembly.

The battery assembly of the present invention is characterized in that the secondary battery having a zener diode between the battery assembly and the photovoltaic cell assembly.

The zener diode of the present invention is characterized in that the anode terminal is a secondary battery is connected to the photovoltaic cell assembly, the cathode terminal is connected to the storage battery assembly.

As described above, according to the present invention, by providing a photovoltaic cell assembly used by converting solar energy of light into electrical energy in addition to the battery assembly used through charging by an external power source, it is possible to secure a spare power, and to charge without an external power source. This can enhance the user's convenience and provide a stable power supply to the electronics.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The details of the object and technical construction of the present invention and the resulting effects thereof will be more clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention.

2 is a circuit diagram showing the configuration of a secondary battery according to an embodiment of the present invention, the secondary battery including a battery assembly 100, the protection circuit 200 and the battery assembly 100 to the external power supply or load It may further include external terminals (P +, P-) for electrically connecting with.

The battery assembly 100 includes a storage assembly 110, a photovoltaic assembly 120 and a zener diode 130 connected in parallel with the storage assembly 110.

The battery assembly 110 may be formed of one or a plurality of bare cells capable of charging and discharging, and the photovoltaic cell assembly 120 may be formed of one or a plurality of optical cells.

As shown in FIG. 2, the battery assembly 100 may include a battery assembly 110 connected to a protection circuit 200, and a photovoltaic assembly 120 connected to the battery assembly 110 in parallel. Can be.

In addition, the battery assembly 100 may be coupled to an electronic device without being connected to the protection circuit 200.

Since the battery assembly 110 and the photovoltaic assembly 120 are connected in parallel, when the photovoltaic assembly 120 is sufficiently charged, energy consumption of the battery assembly 110 can be reduced, so that the battery assembly 110 can be used for a long time.

The bare cell constituting the battery assembly 110 may have a shape of any one of a square, a cylindrical shape, and a pouch type.

The photovoltaic cell assembly 120 is a device manufactured for the purpose of converting solar energy into electrical energy. As a material, silicon, gallium arsenide, cadmium tellurium, cadmium sulfide, or a mixture thereof is used, and silicon is mainly used.

Because the battery assembly 110 and the photovoltaic cell assembly 120 are connected in parallel, when the potential of the photovoltaic cell assembly 120 is higher than the potential of the battery cell assembly 110, the battery cell assembly 110 may connect the photovoltaic cell assembly 120. Charging can be carried out via.

At this time, since the battery assembly 110 may cause problems such as overheating and explosion when overcharged, the maximum potential at which the photovoltaic assembly 120 can be charged by solar energy is such that the battery assembly 110 is charged. It is desirable to equip it with the same maximum potential as possible.

Zener diode 130 is located between the battery assembly 110 and the photovoltaic cell assembly 120 connected in parallel to protect the photovoltaic cell assembly 120 from reverse current, even if charging by an external power source It does not affect the photovoltaic cell assembly 120.

The zener diode 130 has an anode terminal connected to the photovoltaic cell assembly 120 and a cathode terminal connected to the battery cell assembly 110.

The positive terminal B + and the negative terminal B− of the battery assembly 100 are connected to the charger or the load through the external terminals P + and P− through the protection circuit 200.

When connected to the charger, the battery assembly 110 charges, and when connected to the load, the battery assembly 110 supplies power to the load through discharge.

At this time, if the battery assembly 100 is completely discharged and is not charged through an external power source such as a charger, the battery assembly 100 including only the battery assembly 110 can no longer supply power for operating a load.

However, since the photovoltaic cell assembly 120 does not charge using an external power source, but converts and uses the solar energy into electrical energy, the photovoltaic cell assembly 110 may be charged without a separate external power source. It is possible to supply the power much more stably than with the bay.

The battery assembly 100 transmits various kinds of information therein, that is, cell-related information such as the charging potential of the cell and the amount of current flowing through the cell, to the primary and secondary protection circuits 210 and 220.

The protection circuit 200 is typically formed by arranging an electric element on a printed circuit board (PCB) by spot welding, soldering, or the like, and includes a primary protection circuit 210 and a secondary protection circuit 220. And a charge / discharge element unit 230, a thermal fuse 240, a fuse 250, a sensor resistor 260, and the like.

The primary protection circuit 210 receives the signals of the battery 100 and the sensor resistor 260, and charge control signal or discharge control signal for controlling the charge / discharge element unit 230 at the time of over discharge, overcharge or overcurrent. Outputs a role to block the electrical flow so that charging or discharging is not made.

The secondary protection circuit 220 operates in response to a signal input from the battery 100 and the sensor resistor 260, and when an abnormal operation such as an overcurrent occurs, the battery 100 and the external terminal P + or the battery ( The fuse 250 provided in the large current path between the 100 and the external terminal P− is cut off to prevent electrical flow to prevent ignition, combustion, or explosion.

The charge / discharge element unit 230 includes a discharge element 231 and a charging element 233, and the discharge element 231 and the charging element 233 are discharge control signals or charges output from the primary protection circuit 210. In response to the control signal, the discharge element 231 is turned on at the time of discharge, and the charging element 233 is turned on at the time of charging.

In addition, when an abnormal operation such as overdischarge, overcharge, or overcurrent occurs, it is turned off by the charge and discharge control signal of the primary protection circuit 210 to block the discharge and charge operations.

The discharge element 231 and the charging element 233 may be formed of a MOS field effect transistor (MOS FET), and may be an N-type MOS field effect transistor or a P-type MOS field effect transistor.

The thermal fuse 240 is located close to the charging / discharging device unit 230 to sense the temperature of the charging / discharging device unit 230, and when the charging / discharging device unit 230 is overheated and the temperature rises, the electrical flow is increased. By blocking, the charging / discharging element unit 230 is prevented from being damaged due to overheating, and the safety of the battery can be ensured.

The fuse 250 is positioned on a large current path through which a large current flows, and when the overcurrent occurs due to overcharge, overdischarge, or external short circuit, the fuse 250 is forcibly melted to open a circuit to block electrical flow.

The fuse 250 is connected to the secondary protection circuit 220 to operate according to the control signal of the secondary protection circuit 220, and may be a self control protector (SCP).

The fuse 250 is a temperature used in the manufacturing process of a typical battery pack is less than 100 ℃, if the internal temperature of the battery pack is more than 130 ℃ can generate heat or explode by swelling (swelling) phenomenon In view of this, it is preferable to melt at 110 ° C to 130 ° C to break.

The sensor resistor 260 is provided on a large current path through which a large current flows, and is connected to the primary protection circuit 210 and the secondary protection circuit 220 to sense a current flowing in the large current path to detect the primary protection circuit 210. And the secondary protection circuit 220.

Since the sensor resistor 260 is in a state of knowing the resistance value in advance, when the voltage applied to the sensor resistor 260 is detected, not only the charge / discharge voltage of the battery 100 but also indirectly detect the charge / discharge current and an external short state. You can do it.

1 is a diagram illustrating a circuit configuration of a rechargeable battery according to an exemplary embodiment.

2 is a diagram illustrating a circuit configuration of a rechargeable battery according to an exemplary embodiment of the present invention.

[Description of Major Reference Code]

11: battery 12, 230: charge and discharge element

13, 240: thermal fuse 14, 250: fuse

15: External port 16, 210: Primary protection circuit

17, 220: secondary protection circuit 18, 260: sensor resistance

100 battery assembly 110 battery assembly

120: photovoltaic cell assembly 130: zener diode

200: protection circuit 231: discharge element

233: charging element P +, P-: external terminal

B +: positive terminal B-: negative terminal

Claims (8)

Accumulator assembly; And And a battery assembly comprising a photovoltaic assembly connected in parallel with the storage battery assembly. The method of claim 1, The secondary battery may include a protection circuit electrically connected to the battery assembly; And The secondary battery further comprises an external terminal for connecting the battery assembly to an external device. The method of claim 1, The storage battery assembly is a secondary battery, characterized in that consisting of one or a plurality of bare cells. The method of claim 1, The photovoltaic cell assembly is a secondary battery, characterized in that one material selected from the group consisting of silicon, gallium arsenide, cadmium tellurium, cadmium sulfide, and mixtures thereof. The method of claim 1, And the battery assembly includes a zener diode between the storage battery assembly and the photovoltaic cell assembly. The method of claim 3, wherein The bare cell has a shape of any one of a rectangular, cylindrical or pouch type. The method of claim 4, wherein The secondary battery, characterized in that the charging maximum potential of the photovoltaic cell assembly is the same as the charging maximum potential of the battery assembly. The method of claim 5, wherein The zener diode is a secondary battery, characterized in that the anode terminal is connected to the photovoltaic cell assembly, the cathode terminal is connected to the storage battery assembly.

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