KR102175734B1 - Sensor for detecting the pressure of battery and device having the same - Google Patents

Abstract

A battery pressure detection sensor that outputs a resistance value or capacitance corresponding to the pressure applied by the swelling of the battery, and the battery is ignited by controlling the charging of the battery based on the resistance value or capacitance output from the battery pressure detection sensor. And a terminal equipped with a battery pressure sensor to prevent explosion. The presented battery pressure sensing sensor includes an upper electrode layer with an upper electrode pattern, a lower electrode layer disposed under the upper electrode layer and having a lower electrode pattern overlapped with the upper electrode pattern, and an elastic layer disposed between the upper electrode layer and the lower electrode layer. Including, the elastic layer is disposed to overlap the upper electrode pattern and the lower electrode pattern.

Description

Battery pressure detection sensor and terminal equipped with the same {SENSOR FOR DETECTING THE PRESSURE OF BATTERY AND DEVICE HAVING THE SAME}

The present invention relates to a battery pressure detection sensor and a terminal equipped with the same, and more particularly, according to swelling of a battery mounted in an auxiliary power device such as a portable terminal such as a smartphone or a tablet, an auxiliary battery, and a battery pouch. It relates to a battery pressure sensor for sensing pressure and a terminal having the same.

A battery for power supply is mounted in the portable terminal. A battery mainly using a lithium-based battery is mounted in a portable terminal.

When the battery is charged, swelling occurs due to gas generated by an internal compound reaction.

In the portable terminal, if the internal temperature increases while the battery is swollen, ignition or explosion may occur.

Recently, as ignition and explosion of batteries mounted in portable terminals frequently occur, manufacturers are conducting research on various battery control technologies to prevent ignition and explosion of batteries.

For example, a representative method among battery control technologies is a charging cutoff method depending on the battery temperature. The charging cutoff method measures the battery temperature or the internal temperature of the portable terminal through the thermistor, and blocks charging of the battery when the measured temperature is higher than a reference value.

However, even in a normal state, the temperature of the battery frequently rises above the reference value during charging. Since the mobile terminal to which the charging blocking method is applied determines a normal battery as an abnormal state, charging and charging blocking are repeated, thereby increasing the charging time of the battery.

Accordingly, the manufacturing industry is continuously researching technologies for preventing ignition and explosion of the battery while minimizing the increase in the charging time of the battery.

Korean Patent Registration No. 10-0964175 (Name: Battery explosion prevention sensor and battery charging/discharging circuit control method using the same)

The present invention has been proposed in order to solve the above-described conventional problem, and an object of the present invention is to provide a battery pressure detection sensor that outputs a resistance value or capacitance corresponding to a pressure applied by a swelling of a battery.

An object of the present invention is to provide a terminal including a battery pressure sensor that prevents ignition and explosion of a battery by controlling charging of a battery based on a resistance value or capacitance output from a battery pressure sensor.

In order to achieve the above object, the battery pressure sensor according to an embodiment of the present invention includes an upper electrode layer having an upper electrode pattern, a lower electrode pattern disposed below the upper electrode layer, and overlapping the upper electrode pattern. It includes an electrode layer and an elastic layer disposed between the upper and lower electrode layers, and the elastic layer is disposed to overlap the upper and lower electrode patterns. In this case, the adhesive layer may further include an adhesive layer disposed between the upper electrode layer and the lower electrode layer to adhere the upper electrode layer and the lower electrode layer, and the adhesive layer may have a receiving hole in which the elastic layer is accommodated.

In order to achieve the above object, the battery pressure sensor according to another embodiment of the present invention includes a piezoelectric element disposed on the lower electrode layer and the lower electrode layer on which the first electrode and the second electrode are formed to overlap the first electrode and the second electrode. Layer and an upper electrode layer disposed on the piezoelectric layer. At this time, the first electrode and the second electrode include a plurality of linear patterns spaced apart from each other, a linear pattern constituting the second electrode is disposed between the linear patterns constituting the first electrode, and the piezoelectric layer is a resistance variable material And the resistance variable material may be a quantum tunneling composite (QTC).

In order to achieve the above object, a terminal equipped with a battery pressure detection sensor according to an embodiment of the present invention is connected to the thermistor terminal connected to the thermistor and overlapped with the battery and connected to the thermistor terminal, and responds to pressure applied by the swelling of the battery. It is connected to a battery pressure detection sensor that outputs an output value and a thermistor terminal, and includes a central processing unit that controls charging of the battery based on the output value of the battery pressure detection sensor.The thermistor includes an antenna, a USB charging terminal, a central processing unit, and It is disposed in at least one of the power management circuits. At this time, the battery pressure detection sensor outputs a resistance value or a switching event as an output value, and the central processing unit charges the battery by varying the charging current of the battery if the output value of the battery pressure detection sensor is a resistance value, and the output value of the battery pressure detection sensor This switching event can cut off charging of the battery.

In order to achieve the above object, a terminal equipped with a battery pressure sensor according to another embodiment of the present invention is disposed overlapping with a battery and connected to the sensor terminal, and outputs an output value corresponding to the pressure applied by the swelling of the battery. It includes a battery pressure detection sensor, an AD converter that is connected to the sensor terminal and converts the output value of the battery pressure detection sensor into a digital signal, and a central processing unit that controls charging of the battery based on the output value converted to a digital signal from the AD converter. . In this case, the central processing unit may block charging of the battery when the output value of the AD converter exceeds a set value, or may charge the battery by varying the charging current of the battery based on the output value of the AD converter and a plurality of reference values.

In order to achieve the above object, a terminal having a battery pressure detection sensor according to another embodiment of the present invention is an antenna terminal connected to an antenna. The battery pressure detection sensor and antenna terminal are connected to the antenna terminal by overlapping the battery and outputting one of a resistance value, switching event, and capacitance corresponding to the pressure applied by the swelling of the battery as an output value, and the battery pressure It includes a central processing unit that controls battery charging based on the output value of the detection sensor.

At this time, the antenna terminal is one of an antenna for electronic payment, an antenna for wireless power transmission, and an antenna for short-range communication, and in the battery pressure detection sensor, the antenna connected to the antenna terminal is a short-range communication antenna, and corresponding to the pressure applied by the swelling of the battery When the resistance value exceeds the set value, a switching event can be output as an output value.

Meanwhile, the antenna terminal includes a plurality of terminals connected to a plurality of antennas, the battery pressure detection sensor is connected to terminals connected to different antennas among the plurality of terminals, and the central processing unit sets the output value of the battery pressure detection sensor to a set value. If it exceeds, charging of the battery may be blocked, and the battery may be charged by varying the charging current of the battery based on the output value of the battery pressure sensor and a plurality of reference values.

According to the present invention, a battery pressure detection sensor and a terminal equipped with the same detect a resistance value or capacitance C corresponding to the pressure according to the swelling of the battery and control the charging of the battery, so that the swelling that occurs during normal battery charging. There is an effect of distinguishing between a swelling sound that occurs when charging an abnormal battery.

In addition, the battery pressure detection sensor and the terminal equipped with the same control the charging of the battery based on the output value output from the battery pressure detection sensor, thereby controlling the charging of the battery according to the swelling information generated from the battery in an abnormal state to ignite the battery. And there is an effect of preventing an explosion.

In addition, the battery pressure detection sensor and the terminal equipped with the same control the charging of the battery based on the output value output from the battery pressure detection sensor, thereby preventing the normal battery from being blocked from charging compared to the prior art to which the temperature-based charging blocking method is applied. There is an effect that can prevent the battery charging time from increasing.

1 and 2 are diagrams for explaining a battery pressure sensor according to a first embodiment of the present invention.
3 and 4 are views for explaining a battery pressure detection sensor according to a second embodiment of the present invention.
5 and 6 are views for explaining a battery pressure sensor according to a third embodiment of the present invention.
7 and 8 are diagrams for explaining a battery pressure sensor according to a fourth embodiment of the present invention.
9 and 10 are views for explaining a battery pressure detection sensor according to a fifth embodiment of the present invention.
11 is a view for explaining a terminal including a battery pressure sensor according to the first embodiment of the present invention.
12 is a view for explaining a terminal including a battery pressure sensor according to a second embodiment of the present invention.
13 is a view for explaining a terminal including a battery pressure sensor according to a third embodiment of the present invention.
14 and 15 are diagrams for explaining a terminal including a battery pressure sensor according to a fourth embodiment of the present invention.

Hereinafter, in order to describe in detail enough that a person having ordinary knowledge in the technical field of the present invention can easily implement the technical idea of the present invention, a most preferred embodiment of the present invention will be described with reference to the accompanying drawings. . First of all, in adding reference numerals to elements of each drawing, it should be noted that the same elements have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

The battery pressure detection sensor according to the first to third embodiments of the present invention is mounted on a device with a built-in battery to detect a pressure change due to swelling of the battery. The pressure sensor is disposed overlapping with the battery and outputs an output value corresponding to the pressure applied by the swelling of the battery.

The battery pressure detection sensor outputs an output value according to a resistance corresponding to the pressure applied by the swelling of the battery. As an example, the battery pressure detection sensor outputs an output value of a linear resistance value. As another example, the battery pressure detection sensor outputs a switching event shorted at a resistance value exceeding a set resistance value as an output value.

The battery pressure detection sensor outputs an output value according to a capacitor value corresponding to the pressure applied by the swelling of the battery. As an example, the battery pressure detection sensor outputs an output value of a linear capacitor value. Another example is that the battery pressure detection sensor outputs a switching event shorted at a capacitor value exceeding a set capacitor value as an output value.

1 and 2, the battery pressure detection sensor 100 according to the first embodiment of the present invention includes an upper electrode layer 110, an elastic layer 120, a lower electrode layer 130, and an adhesive layer 140. do.

The upper electrode layer 110 is composed of a flexible printed circuit board on which electrodes are formed. To this end, the upper electrode layer 110 includes an upper base sheet 111, an upper electrode pattern 113, an upper connection pattern 115, and an upper terminal pattern 117.

The upper base sheet 111 is composed of a flexible thin film sheet. As an example, the upper base sheet 111 is formed of a flexible thin film sheet having a thickness of about 25 μm.

The upper base sheet 111 is a flexible thin film sheet of one of polyimide (PI), polyester, glass epoxy, and polyethylene terephthalate. In addition, the thin film sheet can be applied as long as it is a material used as a base sheet for a flexible printed circuit board.

The upper electrode pattern 113 is formed on one surface of the upper base sheet 111. The upper electrode pattern 113 is formed on one of the upper and lower surfaces of the upper base sheet 111 in the direction in which the elastic layer 120 is disposed.

The upper electrode pattern 113 is formed of a thin conductive metal having a predetermined shape. The upper electrode pattern 113 may be formed in a polygonal shape such as a circle, an oval, a square, or a triangle. As an example, the upper electrode pattern 113 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The upper electrode pattern 113 may be formed of a transparent electrode material such as ITO.

As an example, the upper electrode pattern 113 is formed of a circular thin film made of copper, and is formed on the lower surface of the upper base sheet 111 in the direction in which the elastic layer 120 is disposed.

The upper connection pattern 115 is formed on one surface of the upper base sheet 111. The upper connection pattern 115 is formed on one of the upper and lower surfaces of the upper base sheet 111 on which the upper electrode pattern 113 is formed. The upper connection pattern 115 may be formed on a different surface from the upper electrode pattern 113.

The upper connection pattern 115 is formed of a linear thin film conductive metal. The upper connection pattern 115 may be formed of the same conductive metal as the upper electrode pattern 113, or may be formed of a different type of conductive metal. The upper connection pattern 115 is made of one of a conductive metal among copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The upper connection pattern 115 may be formed of a transparent electrode material such as ITO.

One end of the upper connection pattern 115 is connected to the upper electrode pattern 113. The other end of the lower connection pattern 135 is connected to the upper terminal pattern 117.

The upper terminal pattern 117 is formed on one surface of the upper base sheet 111. The upper terminal pattern 117 is formed on one of the upper and lower surfaces of the upper base sheet 111 on which the upper electrode pattern 113 and the upper connection pattern 115 are formed. The upper terminal pattern 117 may be formed on one surface different from the upper electrode pattern 113 and the upper connection pattern 115. When the upper electrode pattern 113 and the upper connection pattern 115 are formed on different surfaces, the upper terminal pattern 117 may be formed on the same surface as one of the upper electrode pattern 113 and the upper connection pattern 115. have.

The upper terminal pattern 117 may extend from the upper connection pattern 115 and may be formed outside the upper base sheet 111. In this case, a protective sheet 119 for insulating and protecting the upper terminal pattern 117 may be adhered to one surface of the upper terminal pattern 117.

As an example, the upper electrode pattern 113, the upper connection pattern 115, and the upper terminal pattern 117 are thin-film conductive metals having a thickness of about 12 μm.

Here, the upper electrode pattern 113, the upper connection pattern 115, and the upper terminal pattern 117 have been separated and described in order to easily describe the battery pressure sensor 100 according to an embodiment of the present invention, but the actual product When implemented, the upper electrode pattern 113, the upper connection pattern 115, and the upper terminal pattern 117 may be integrally formed.

The elastic layer 120 is disposed between the upper electrode layer 110 and the lower electrode layer 130. The elastic layer 120 is formed of a material having elasticity. As an example, the elastic layer 120 is an elastomer containing at least one of silicon (Si), polydimethylsiloxane (PDMS), EcoFlex, Nusil, hydrogel, and polyurethane. do.

The elastic layer 120 is described between the upper electrode layer 110 and the lower electrode layer 130. The elastic layer 120 is provided between the upper electrode layer 110 and the lower electrode layer 130 to form a space (or void) between the upper electrode layer 110 and the lower electrode layer 130. The elastic layer 120 may have a thickness of about 12 μm to 24 μm.

Since the elastic material is mainly an insulating material, if it is composed of a non-porous film substrate, resistance is not formed between the upper electrode layer 110 and the lower electrode layer 130 even when pressure is applied due to the swelling of the battery.

Therefore, the elastic layer 120 is formed in a structure having a space (or void). The elastic layer 120 is formed of one of a dot space structure, a mesh structure, and a porous film structure.

The elastic layer 120 may be formed in a dot space structure by printing a plurality of dots on one surface of the upper electrode layer 110 or the lower electrode layer 130 through a printing process. A plurality of dots are formed to be spaced apart from each other by a predetermined distance. The dot space structure is a structure in which a resistive touch panel is mainly used.

The elastic layer 120 may adjust the switching pressure of the battery pressure sensor 100 by printing dots having different thicknesses twice.

The elastic layer 120 may adjust the open rate of the dot spacer by changing the pattern of a plurality of dots. The elastic layer 120 may adjust the switching pressure of the battery pressure detection sensor 100 by adjusting the open rate. Here, the open rate may mean a ratio of a region in which a dot is not formed according to the thickness and spacing of the dots.

The elastic layer 120 may be formed in a mesh structure by repeating the screen printing process. During the screen printing process, a plurality of elastic lines spaced apart from each other are formed, and the elastic layer 120 having a mesh structure in which a plurality of elastic lines are stacked is formed by repeating the screen printing process. The elastic layer 120 may be formed on one surface of the upper electrode layer 110 or the lower electrode layer 130 through screen printing.

The elastic layer 120 may be formed in a porous film structure having a plurality of pores by mixing silver wire with an elastic material. As an example, the elastic layer 120 has a porous film structure obtained by mixing silver yarn with silicon (Si).

The elastic layer 120 may be formed in a perforated structure by perforating a plurality of holes in the elastic film. As an example, the elastic layer 120 has a perforated structure in which a plurality of holes are perforated in a polyimide thin film through a punching process.

The lower electrode layer 130 is composed of a flexible printed circuit board on which electrodes are formed. To this end, the lower electrode layer 130 includes a lower base sheet 131, a lower electrode pattern 133, a lower connection pattern 135, and a lower terminal pattern 137. The lower electrode layer 130 is disposed under the upper electrode layer 110 so that the lower electrode pattern 133 and the upper electrode pattern 113 overlap.

The lower base sheet 131 is composed of a flexible thin film sheet. As an example, the lower base sheet 131 is formed of a flexible thin film sheet having a thickness of about 25 μm. Here, as an example, the lower base sheet 131 is a flexible thin film sheet of polyimide, polyester, glass epoxy, and polyethylene terephthalate.

The lower electrode pattern 133 is formed on one surface of the lower base sheet 131. The lower electrode pattern 133 is formed on one of the upper and lower surfaces of the lower base sheet 131 in the direction in which the elastic layer 120 is disposed. The lower electrode pattern 133 overlaps the upper electrode pattern 113 with the elastic layer 120 therebetween,

The lower electrode pattern 133 is formed of a thin conductive metal having a predetermined shape. The lower electrode pattern 133 may be formed in a polygonal shape such as a circle, an oval, a square, or a triangle. As an example, the lower electrode pattern 133 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The lower electrode pattern 133 may be formed of a transparent electrode material such as ITO.

The lower electrode pattern 133 is formed of a circular thin film made of copper, and is formed on the upper surface of the lower base sheet 131 in the direction in which the elastic layer 120 is disposed.

The lower connection pattern 135 is formed on one surface of the lower base sheet 131. The lower connection pattern 135 is formed on one of the upper and lower surfaces of the lower base sheet 131 on which the lower electrode pattern 133 is formed. The lower connection pattern 135 may be formed on a different surface from the lower electrode pattern 133.

The lower connection pattern 135 is formed of a linear thin film conductive metal. The lower connection pattern 135 may be formed of the same conductive metal as the lower electrode pattern 133 or may be formed of a different type of conductive metal. The lower connection pattern 135 is made of one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The lower connection pattern 135 may be formed of a transparent electrode material such as ITO.

One end of the lower connection pattern 135 is connected to the lower electrode pattern 133. The other end of the lower connection pattern 135 is connected to the lower terminal pattern 137.

The lower terminal pattern 137 is formed on one surface of the lower base sheet 131. The lower terminal pattern 137 is formed on one of the upper and lower surfaces of the lower base sheet 131 on which the lower electrode pattern 133 and the lower connection pattern 135 are formed. The lower terminal pattern 137 may be formed on one surface different from the lower electrode pattern 133 and the lower connection pattern 135. The lower terminal pattern 137 may be formed on the same surface as one of the lower electrode pattern 133 and the lower connection pattern 135 when the lower electrode pattern 133 and the lower connection pattern 135 are formed on different surfaces. have.

The lower terminal pattern 137 may extend from the lower connection pattern 135 and may be formed outside the lower base sheet 131. In this case, a protective sheet 139 for insulating and protecting the lower terminal pattern 137 may be adhered to one surface of the lower terminal pattern 137.

As an example, the lower connection pattern 135, the lower terminal pattern 137, and the lower terminal pattern 137 are thin-film conductive metals having a thickness of about 12 μm.

Here, the lower connection pattern 135, the lower electrode pattern 133, and the lower terminal pattern 137 have been separately described in order to easily describe the battery pressure sensor 100 according to the embodiment of the present invention, but the actual product When implemented, the lower connection pattern 135, the lower terminal pattern 137, and the lower terminal pattern 137 may be integrally formed.

The adhesive layer 140 is disposed between the upper electrode layer 110 and the lower electrode layer 130 to adhere the upper electrode layer 110 and the lower electrode layer 130. As an example, the adhesive layer 140 is a double-sided adhesive tape having a thickness of about 30 μm.

The adhesive layer 140 has a receiving hole 142 in which the elastic layer 120 is accommodated. Since the elastic layer 120 is accommodated and disposed in the receiving hole 142, the thickness of the battery pressure sensor 100 does not increase.

The battery pressure detection sensor 100 according to the first embodiment of the present invention outputs a switching event shorted at a resistance value exceeding a set resistance value as an output value.

3 and 4, the battery pressure sensor 200 according to the second embodiment of the present invention includes an upper electrode layer 210, an elastic layer 220, a lower electrode layer 230, an upper adhesive layer 240, and It includes a lower adhesive layer 250. Here, since the upper electrode layer 210 and the lower electrode layer 230 are the same as the upper electrode layer 210 and the lower electrode layer 230 of the battery pressure sensor 200 according to the first embodiment described above, detailed descriptions are omitted.

The upper electrode layer 210 includes an upper base sheet 211, an upper electrode pattern 213, an upper connection pattern 215, and an upper terminal pattern 217.

The lower electrode layer 230 is disposed under the upper electrode layer 210. The lower electrode layer 230 includes a lower base sheet 231, a lower electrode pattern 233, a lower connection pattern 235, and a lower terminal pattern 237.

The elastic layer 220 is formed in a perforated structure. The elastic layer 220 may be formed in a perforated structure by perforating a plurality of holes 222 in the elastic film. The elastic layer 220 may be formed in a perforated structure in which a plurality of holes 222 are formed only in a region overlapping the upper electrode pattern 213 and the lower electrode pattern 233.

As an example, the elastic layer 220 has a perforated structure in which a plurality of holes 222 are perforated in a thin film made of urethane (Pu) through a punching process. At this time, it is assumed that the thickness of the elastic layer 220 (ie, the thickness of the thin film) is approximately 20 μm.

The elastic layer 220 can adjust the switching pressure of the battery pressure sensor 200 by varying the diameter of the hole 222 perforated in the thin film. The elastic layer 220 may adjust the switching pressure of the battery pressure sensor 200 by adjusting the ratio of the hole diameter and the thickness of the thin film.

The upper adhesive layer 240 is disposed between the upper electrode layer 210 and the elastic layer 220. The upper adhesive layer 240 adheres the upper electrode layer 210 and the elastic layer 220. The upper adhesive layer 240 may have a plurality of holes 242 corresponding to the plurality of holes 222 formed in the elastic layer 220.

The lower adhesive layer 250 is disposed between the elastic layer 220 and the lower electrode layer 230. The lower adhesive layer 250 adheres the elastic layer 220 and the lower electrode layer 230. The lower adhesive layer 250 may have a plurality of holes 252 corresponding to the plurality of holes 222 formed in the elastic layer 220.

As an example, the upper adhesive layer 240 and the lower adhesive layer 250 are double-sided adhesive tapes having a thickness of about 5 μm.

The battery pressure detection sensor 200 according to the second embodiment of the present invention outputs a switching event short-circuited at a resistance value exceeding the set resistance value as an output value.

5 and 6, the battery pressure sensor according to the third embodiment of the present invention includes a lower electrode layer 310, a piezoelectric layer 320, an upper electrode layer 330, a protective layer 340, and an adhesive layer 350. ).

The upper electrode layer 330 is composed of a flexible printed circuit board on which the first electrode 312 and the second electrode 316 are formed. To this end, the upper electrode layer 330 includes a base sheet 311, a first electrode 312 and a second electrode 316.

The base sheet 311 is composed of a flexible thin film sheet. As an example, the base sheet 311 is formed of a flexible thin film sheet having a thickness of approximately 25 μm to 50 μm.

As an example, the base sheet 311 is a flexible thin-film sheet of polyimide, polyester, glass epoxy, and polyethylene terephthalate. In addition, the thin film sheet may be applied as long as it is a material used as the base sheet 311 of the flexible printed circuit board. As an example, the base sheet 311 is a polyimide thin film sheet having a thickness of about 25 μm or a polyethylene terephthalate thin film sheet having a thickness of about 50 μm.

The first electrode 312 and the second electrode 316 are formed on one surface of the base sheet 311. The first electrode 312 and the second electrode 316 are formed on one side of the upper and lower surfaces of the base sheet 311 in the direction in which the piezoelectric layer 320 is disposed.

The first electrode 312 and the second electrode 316 are formed of a thin conductive metal. The first electrode 312 and the second electrode 316 are formed of a conductive metal having a thickness of about 12 μm. As an example, the first electrode 312 and the second electrode 316 are one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The first electrode 312 and the second electrode 316 may be formed of a transparent electrode material such as ITO.

The first electrode 312 includes a first detection pattern 313, a first connection pattern 314, and a first terminal pattern 315. The first detection pattern 313 is composed of a plurality of linear patterns spaced apart from each other. The first connection pattern 314 is connected to one end of a plurality of linear patterns constituting the first detection pattern 313. The first terminal pattern 315 is connected to the first detection pattern 313. The first terminal pattern 315 may extend from the first connection pattern 314 and may be formed outside the base sheet 311. In this case, a protective sheet for insulating and protecting the first terminal pattern 315 may be adhered to one surface of the first terminal pattern 315.

The second electrode 316 includes a second sensing pattern 317, a second connection pattern 318, and a second terminal pattern 319. The second sensing pattern 317 is composed of a plurality of linear patterns spaced apart from each other. The second connection pattern 318 is connected to one end of a plurality of linear patterns constituting the second detection pattern 317. The second terminal pattern 319 is connected to the second sensing pattern 317. The second terminal pattern 319 may extend from the second connection pattern 318 and may be formed outside the base sheet 311. In this case, a protective sheet for insulating and protecting the second terminal pattern 319 may be adhered to one surface of the second terminal pattern 319.

In this case, the linear patterns constituting the first detection pattern 313 and the second detection pattern 317 are alternately arranged. A plurality of linear patterns constituting the second detection pattern 317 are disposed between the plurality of linear patterns constituting the first detection pattern 313.

The piezoelectric layer 320 is disposed on the lower electrode layer 310. The piezoelectric layer 320 is disposed on the first electrode 312 and the second electrode 316 formed on the lower electrode layer 310. The piezoelectric layer 320 is formed of a resistance-variable material whose resistance is variable by a pressure applied according to contact with an object. The piezoelectric layer 320 may include a material whose sheet resistance varies according to a pressure generated when an object is in contact with each other. As an example, the piezoelectric layer 320 includes a quantum tunneling composite (QTC) that is a composite of a metallic material and a non-conductive elastomer. As an example, the piezoelectric layer 320 is a quantum tunneling composite having a thickness of about 8 μm to 10 μm.

The quantum tunneling composite is a resistance variable material that combines metal particles having a surface protrusion structure in a non-conducting elastomeric binder. When no pressure is applied, the metal particles are separated from each other and cannot conduct electricity. When pressure is applied, the metal particles are adjacent to each other and may tunnel through a non-conductive elastic binder (insulator).

In the battery pressure detection sensor, when pressure is applied due to the occurrence of battery swelling, current flows from the portion where the piezoelectric layer 320 is in close contact. The upper electrode layer 330 and the lower electrode layer 310 are electrically connected by the piezoelectric layer 320. The battery pressure sensor has a variable resistance value because the contact area between the upper electrode layer 330 and the lower electrode layer 310 varies according to the strength of the pressure applied to the piezoelectric layer 320.

The upper electrode layer 330 is disposed on the piezoelectric layer 320. The upper electrode layer 330 overlaps the first electrode 312 and the second electrode 316 while covering a space between the first electrode 312 and the second electrode 316 of the lower electrode layer 310. The upper electrode layer 330 electrically connects the first electrode 312 and the second electrode 316 when a current flows through the piezoelectric layer 320 as a battery swelling occurs and pressure is applied. The upper electrode layer 330 is formed of a conductive metal, and the upper electrode layer 330 is made of carbon having a thickness of about 5 μm.

The protective layer 340 is disposed on the upper electrode layer 330. The protective layer 340 insulates and protects the upper electrode layer 330. The protective layer 340 is formed of a thin film sheet of an insulating material. As an example, the protective layer 340 is a thin film sheet made of polyimide (PI) material having a thickness of about 25 μm or polyethylene terephthalate (PET) material having a thickness of about 30 μm.

The adhesive layer 350 is disposed between the lower electrode layer 310 and the protective layer 340 to adhere the lower electrode layer 310 and the protective layer 340. The adhesive layer 350 has a receiving hole 352 in which the piezoelectric layer 320 and the upper electrode layer 330 are accommodated. The thickness of the adhesive layer 350 may be formed differently depending on the thickness of the piezoelectric layer 320 and the upper electrode layer 330. The adhesive layer 350 is formed thicker than the sum of the thickness of the piezoelectric layer 320 and the thickness of the electrode layer. As an example, the adhesive layer 350 is a double-sided adhesive tape having a thickness of approximately 30 μm to 50 μm.

The battery pressure detection sensor according to the third embodiment of the present invention outputs an output value of a linear resistance value.

A terminal equipped with a battery pressure sensor according to an embodiment of the present invention (hereinafter, referred to as a terminal) includes all electronic devices equipped with batteries such as portable terminals such as smartphones and tablets, auxiliary batteries, and auxiliary power devices such as battery pouch. Include.

A terminal according to an embodiment of the present invention processes the battery pressure detection signal by connecting the battery pressure detection sensors 100, 200, and 300 to a processor to which an AD converter is connected. Hereinafter, the battery pressure sensor (100, 200, 300) is connected to the thermistor terminal as an example, but the present invention is not limited thereto. have.

The battery pressure sensor according to the fourth and fifth embodiments of the present invention outputs an output value according to a capacitance (ie, capacitance C) corresponding to a pressure applied by the swelling of the battery. As an example, the battery pressure detection sensor outputs a linear capacitance as an output value.

7 and 8, the battery pressure sensor 400 according to the fourth embodiment of the present invention includes an upper electrode layer 410, an elastic layer 420, a lower electrode layer 430, and an adhesive layer 440. do.

The upper electrode layer 410 is composed of a flexible printed circuit board on which electrodes are formed. To this end, the upper electrode layer 410 includes an upper base sheet 411, an upper electrode pattern 413, an upper connection pattern 415, and an upper terminal pattern 417.

The upper base sheet 411 is composed of a flexible thin film sheet. As an example, the upper base sheet 411 is formed of a flexible thin film sheet having a thickness of about 25 μm.

The upper electrode pattern 413 is formed on one surface of the upper base sheet 411. The upper electrode pattern 413 is formed on one of the upper and lower surfaces of the upper base sheet 411 in the direction in which the elastic layer 420 is disposed.

The upper electrode pattern 413 is formed of a thin conductive metal having a predetermined shape. The upper electrode pattern 413 may be formed in a polygonal shape such as a circle, an oval, a square, or a triangle. As an example, the upper electrode pattern 413 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The upper electrode pattern 413 may be formed of a transparent electrode material such as ITO.

The upper electrode pattern 413 is formed of a circular thin film made of copper, and is formed on the lower surface of the upper base sheet 411 in the direction in which the elastic layer 420 is disposed.

The upper connection pattern 415 is formed on one surface of the upper base sheet 411. The upper connection pattern 415 is formed on one of the upper and lower surfaces of the upper base sheet 411 on which the upper electrode pattern 413 is formed. The upper connection pattern 415 may be formed on a different surface from the upper electrode pattern 413.

The upper connection pattern 415 is formed of a linear thin film conductive metal. The upper connection pattern 415 may be formed of the same conductive metal as the upper electrode pattern 413 or may be formed of a different type of conductive metal. As an example, the upper connection pattern 415 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The upper connection pattern 415 may be formed of a transparent electrode material such as ITO.

One end of the upper connection pattern 415 is connected to the upper electrode pattern 413. The other end of the lower connection pattern 435 is connected to the upper terminal pattern 417.

The upper terminal pattern 417 is formed on one surface of the upper base sheet 411. The upper terminal pattern 417 is formed on one surface of the upper and lower surfaces of the upper base sheet 411 on which the upper electrode pattern 413 and the upper connection pattern 415 are formed. The upper terminal pattern 417 may be formed on one surface different from the upper electrode pattern 413 and the upper connection pattern 415. The upper terminal pattern 417 may be formed on the same surface as one of the upper electrode pattern 413 and the upper connection pattern 415 when the upper electrode pattern 413 and the upper connection pattern 415 are formed on different surfaces. have.

The upper terminal pattern 417 may extend from the upper connection pattern 415 and may be formed outside the upper base sheet 411. In this case, a protective sheet 419 for insulating and protecting the upper terminal pattern 417 may be adhered to one surface of the upper terminal pattern 417.

As an example, the upper connection pattern 415, the upper terminal pattern 417, and the upper terminal pattern 417 are thin-film conductive metals having a thickness of about 12 μm.

Here, in order to easily describe the battery pressure sensor 400 according to the fourth embodiment of the present invention, the upper connection pattern 415, the upper electrode pattern 413, and the upper terminal pattern 417 have been separately described. When an actual product is implemented, the upper connection pattern 415, the upper terminal pattern 417, and the upper terminal pattern 417 may be integrally formed.

The elastic layer 420 is disposed between the upper electrode layer 410 and the lower electrode layer 430. The elastic layer 420 is formed of a material having elasticity.

The elastic layer 420 is formed of a thin sheet of an elastic material. The elastic layer 420 may be formed by directly printing an elastic material on one surface of the upper electrode layer 410 or the lower electrode layer 430 through a screen printing process.

The lower electrode layer 430 is composed of a flexible printed circuit board on which electrodes are formed. To this end, the lower electrode layer 430 includes a lower base sheet 431, a lower electrode pattern 433, a lower connection pattern 435, and a lower terminal pattern 437. The lower electrode layer 430 is disposed under the upper electrode layer 410 so that the lower electrode pattern 433 and the upper electrode pattern 413 overlap.

The lower base sheet 431 is composed of a flexible thin film sheet. As an example, the lower base sheet 431 is formed of a flexible thin film sheet having a thickness of about 25 μm.

The lower electrode pattern 433 is formed on one surface of the lower base sheet 431. The lower electrode pattern 433 is formed on one of the upper and lower surfaces of the lower base sheet 431 in the direction in which the elastic layer 420 is disposed. The lower electrode pattern 433 overlaps the upper electrode pattern 413 with the elastic layer 420 therebetween.

The lower electrode pattern 433 is formed of a thin conductive metal having a predetermined shape. The lower electrode pattern 433 may be formed in a polygonal shape such as a circle, an oval, a square, and a triangle. As an example, the lower electrode pattern 433 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The lower electrode pattern 433 may be formed of a transparent electrode material such as ITO.

For example, the lower electrode pattern 433 is formed of a circular thin film made of copper, and is formed on the upper surface of the lower base sheet 431 in the direction in which the elastic layer 420 is disposed.

The lower connection pattern 435 is formed on one surface of the lower base sheet 431. The lower connection pattern 435 is formed on one of the upper and lower surfaces of the lower base sheet 431 on which the lower electrode pattern 433 is formed. The lower connection pattern 435 may be formed on a different surface from the lower electrode pattern 433.

The lower connection pattern 435 is formed of a linear thin film conductive metal. The lower connection pattern 435 may be formed of the same conductive metal as the lower electrode pattern 433 or may be formed of a different type of conductive metal. As an example, the lower connection pattern 435 is one of a conductive metal selected from copper (Cu), silver (Ag), nickel (Ni), and platinum (Pt). The lower connection pattern 435 may be formed of a transparent electrode material such as ITO.

One end of the lower connection pattern 435 is connected to the lower electrode pattern 433. The other end of the lower connection pattern 435 is connected to the lower terminal pattern 437.

The lower terminal pattern 437 is formed on one surface of the lower base sheet 431. The lower terminal pattern 437 is formed on one of the upper and lower surfaces of the lower base sheet 431 on which the lower electrode pattern 433 and the lower connection pattern 435 are formed. The lower terminal pattern 437 may be formed on one surface different from the lower electrode pattern 433 and the lower connection pattern 435. The lower terminal pattern 437 may be formed on the same surface as one of the lower electrode pattern 433 and the lower connection pattern 435 when the lower electrode pattern 433 and the lower connection pattern 435 are formed on different surfaces. have.

The lower terminal pattern 437 may extend from the lower connection pattern 435 and may be formed outside the lower base sheet 431. In this case, a protective sheet 439 for insulating and protecting the lower terminal pattern 437 may be adhered to one surface of the lower terminal pattern 437.

The lower connection pattern 435, the lower terminal pattern 437, and the lower terminal pattern 437 are made of a thin conductive metal having a thickness of about 12 μm.

Here, in order to easily describe the battery pressure detection sensor 400 according to the fourth embodiment of the present invention, the lower connection pattern 435, the lower electrode pattern 433 and the lower terminal pattern 437 have been separately described. When an actual product is implemented, the lower connection pattern 435, the lower terminal pattern 437, and the lower terminal pattern 437 may be integrally formed.

The adhesive layer 440 is disposed between the upper electrode layer 410 and the lower electrode layer 430 to adhere the upper electrode layer 410 and the lower electrode layer 430. As an example, the adhesive layer 440 is a double-sided adhesive tape having a thickness of about 30 μm.

The adhesive layer 440 has a receiving hole 442 in which the elastic layer 420 is accommodated. Since the elastic layer 420 is accommodated and disposed in the receiving hole 442, the thickness of the battery pressure sensor 400 does not increase.

9 and 10, the battery pressure sensor 500 according to the fifth embodiment of the present invention includes an upper electrode layer 510, an elastic layer 520, a lower electrode layer 530, an upper adhesive layer 540, and It includes a lower adhesive layer (550). Here, since the upper electrode layer 510 and the lower electrode layer 530 are the same as the upper electrode layer 510 and the lower electrode layer 530 of the battery pressure sensor 500 according to the fourth embodiment described above, detailed descriptions are omitted.

The upper electrode layer 510 includes an upper base sheet 511, an upper electrode pattern 513, an upper connection pattern 515, and an upper terminal pattern 517.

The lower electrode layer 530 is disposed under the upper electrode layer 510. The lower electrode layer 530 includes a lower base sheet 531, a lower electrode pattern 533, a lower connection pattern 535, and a lower terminal pattern 537.

The elastic layer 520 is disposed between the upper electrode layer 510 and the lower electrode layer 530. The elastic layer 520 is formed of a material having elasticity.

The elastic layer 520 is formed of a thin sheet of an elastic material. The elastic layer 520 may be formed by directly printing an elastic material on one surface of the upper electrode layer 510 or the lower electrode layer 530 through a screen printing process.

The upper adhesive layer 540 is disposed between the upper electrode layer 510 and the elastic layer 520. The upper adhesive layer 540 adheres the upper electrode layer 510 and the elastic layer 520 to each other. The upper adhesive layer 540 may have a plurality of holes 542 corresponding to the plurality of holes 522 formed in the elastic layer 520.

The lower adhesive layer 550 is disposed between the elastic layer 520 and the lower electrode layer 530. The lower adhesive layer 550 adheres the elastic layer 520 and the lower electrode layer 530. The lower adhesive layer 550 may have a plurality of holes 552 corresponding to the plurality of holes 522 formed in the elastic layer 520.

As an example, the upper adhesive layer 540 and the lower adhesive layer 550 are double-sided adhesive tapes having a thickness of about 5 μm.

The terminal (hereinafter referred to as the terminal) equipped with a battery pressure sensor according to the first embodiment of the present invention includes all electronic devices equipped with a battery, such as portable terminals such as smart phones and tablets, auxiliary batteries, and auxiliary power devices such as battery pouch. Includes devices.

A terminal according to an embodiment of the present invention processes the battery pressure detection signal by connecting the battery pressure detection sensors 100, 200, and 300 to a processor to which an AD converter is connected. Hereinafter, the battery pressure sensor (100, 200, 300) is connected to the thermistor terminal as an example, but the present invention is not limited thereto. have.

Referring to FIG. 11, the terminal according to the first embodiment of the present invention includes a thermistor 610, a thermistor terminal 620, a battery pressure detection sensor 630, a central processing unit 640, an application processor (AP), and a battery charging. Circuit 650.

The thermistor 610 is mounted on a terminal and outputs a resistance value according to temperature. The thermistor 610 is a semiconductor device having a property of rapidly decreasing a resistance value as the internal temperature of the terminal increases. The thermistor 610 is disposed around major heating components such as an antenna built into the terminal, a USB charging terminal, a central processing unit 640, and a power management integrated circuit (PMIC).

The thermistor terminal 620 is composed of a pair of terminals 620a and 620b. The thermistor terminal 620 is connected to both ends of the thermistor 610. The thermistor terminal 620 is connected to the central processing unit 640 through a bus. As an example, the thermistor terminal 620 is connected to the thermistor 610 disposed around one of an antenna, a USB charging terminal, a central processing unit 640, and a power management circuit.

The battery pressure detection sensor 630 is disposed to overlap the battery 10 mounted in the terminal. The battery pressure sensor 630 is disposed so that the battery 10 and the electrode pattern overlap. The battery pressure detection sensor 630 outputs a resistance value corresponding to the pressure applied by the swelling of the battery 10.

The battery pressure sensor 630 outputs a linear resistance value corresponding to the swelling of the battery 10. The battery pressure detection sensor 630 may output a switching event shorted at a resistance value exceeding a set resistance value as an output value.

The battery pressure detection sensor 630 is connected to the thermistor terminal 620. Both ends of the battery pressure detection sensor 630 are connected to a pair of terminals 620a and 620b constituting the thermistor terminal 620, respectively. The battery pressure detection sensor 630 outputs an output value to the thermistor terminal 620. The thermistor terminal 620 transmits an output value to the central processing unit 640 through a bus.

Here, as an example, the battery pressure detection sensor 630 is one of the battery pressure detection sensors 100, 200, and 300 according to the first to third embodiments described above.

The central processing unit 640 is connected to the thermistor terminal 620. The central processing unit 640 receives the output value of the battery pressure detection sensor 630 through the thermistor terminal 620. The central processing unit 640 receives one of a linear resistance value and a switching event from the battery pressure sensor 630.

The central processing unit 640 controls charging of the battery 10 based on an output value transmitted from the battery pressure sensor 630. The central processing unit 640 controls battery charging in an event method or a multi-step method based on the output value.

The central processing unit 640 blocks charging of the battery 10 when the output value of the battery pressure sensor 630 is a switching event. When receiving an output value, which is a switching event, the central processing unit 640 determines that the battery 10 may ignite or explode, and blocks charging of the battery 10.

If the output value of the battery pressure detection sensor 630 is a linear resistance value, the central processing unit 640 controls charging of the battery 10 by comparing the output value and a reference value. The central processing unit 640 controls the charging of the battery 10 in stages based on a plurality of reference values and output values. The reference value is a value set to prevent ignition or explosion due to the swelling of the battery 10 and is a resistance value as an example.

The central processing unit 640 varies the charging current of the battery 10 when the battery charging is controlled in a multi-stage manner. The central processing unit 640 controls to charge the battery 10 by gradually increasing or decreasing the charging current according to the linear resistance value.

The battery charging circuit 650 charges the battery 10 under the control of the central processing unit 640. The battery charging circuit 650 turns on/off the charging of the battery 10 under the control of the central processing unit 640. The battery charging circuit 650 charges the battery 10 by increasing or decreasing the charging current under the control of the central processing unit 640.

In the terminal according to the second embodiment of the present invention, a processor connected to an AD converter capable of receiving and processing the battery pressure sensors 400 and 500 as an input or a controller of a touch screen panel (TSP) processor) to process the battery pressure detection signal.

Referring to FIG. 12, the terminal according to the second embodiment of the present invention includes a battery pressure sensor 710, a sensor terminal 720, an AD converter 730, a central processing unit 740, an application processor (AP), and a battery. And a charging circuit 750.

The battery pressure detection sensor 710 is disposed to overlap the battery 10 mounted in the terminal. The battery pressure detection sensor 710 is disposed so that the battery 10 and the electrode pattern overlap. The battery pressure detection sensor 710 outputs a capacitance corresponding to the pressure applied by the swelling of the battery 10. The battery pressure sensor 710 outputs a linear capacitance corresponding to the swelling of the battery 10.

The battery pressure detection sensor 710 is connected to the sensor terminal 720. Both ends of the battery pressure detection sensor 710 are connected to a pair of terminals 720a and 720b constituting the sensor terminal 720, respectively. The battery pressure detection sensor 710 outputs an output value (ie, capacitance) to the sensor terminal 720.

Here, as an example, the battery pressure detection sensor 710 is one of the battery pressure detection sensors 400 and 500 according to the fourth and fifth embodiments described above.

The sensor terminal 720 is connected to the battery pressure detection sensor 710 and the AD converter 730. The sensor terminal 720 is composed of a pair of terminals 720a and 720b. The sensor terminal 720 transmits to the AD converter 730 through a bus.

The AD converter 730 receives the capacitance, which is an output value of the battery pressure detection sensors 100, 200, 400, through the sensor terminal 720. The AD converter 730 converts capacitance, which is analog data, into digital data, and transmits it to the central processing unit 740.

The central processing unit 740 is connected to the AD converter 730. The central processing unit 740 receives the output value of the battery pressure detection sensor 710 through the AD converter 730. The central processing unit 740 receives a linear capacitance, which is an output value of the battery pressure sensor 710. Here, as an example, the central processing unit 740 is a controller of a touch screen pattern (TSP).

The central processing unit 740 controls charging of the battery 10 based on an output value transmitted from the battery pressure sensor 710. The central processing unit 740 controls battery charging in an event method or a multi-step method based on an output value.

If the output value of the battery pressure detection sensor 710 is a linear capacitance, the central processing unit 740 controls charging of the battery 10 by comparing the output value and a reference value. The central processing unit 740 blocks the charging of the battery 10 when the capacitance, which is the output value, exceeds the reference value.

The central processing unit 740 may control charging of the battery 10 in stages based on a plurality of reference values and output values. The reference value is a value set to prevent ignition or explosion due to the swelling of the battery 10, and is an example of a capacitance.

The central processing unit 740 varies the charging current of the battery 10 when the battery charging is controlled in a multi-step manner. The central processing unit 740 controls to charge the battery 10 by gradually increasing or decreasing the charging current according to the linear capacitance.

The battery charging circuit 750 charges the battery 10 under the control of the central processing unit 740. The battery charging circuit 750 turns on/off the charging of the battery 10 under the control of the central processing unit 740. The battery charging circuit 750 charges the battery 10 by increasing or decreasing the charging current under the control of the central processing unit 740.

13, a terminal according to the third embodiment of the present invention includes an antenna 810, an antenna terminal 820, a battery pressure sensor 830, a central processing unit 840, and a battery charging circuit 850. Include.

The antenna 810 is composed of a single antenna 810 resonating in one frequency band. For example, the antenna 810 is one of a short-range communication (NFC) antenna, an electronic payment (MST) antenna, and a wireless power transmission (WPC) antenna.

The antenna terminals 820 are configured as a pair of terminals. The antenna terminals 820 are connected to both ends of the antenna 810. The antenna terminal 820 is connected to the central processing unit 840 through a bus.

The battery pressure sensor 830 is disposed to overlap the battery 10 mounted in the terminal. The battery pressure sensor 830 is disposed so that the battery 10 and the electrode pattern overlap. The battery pressure sensor 830 outputs a resistance value corresponding to the pressure applied by the swelling of the battery 10.

The battery pressure sensor 830 outputs a linear resistance value corresponding to the swelling of the battery 10. The battery pressure detection sensor 830 may output a switching event shorted at a resistance value exceeding the set resistance value as an output value.

If the antenna 810 is an antenna for short-range communication, the battery pressure sensor 830 outputs a switching event as an output value. When the battery pressure detection sensor 830 is configured to output a linear resistance value (that is, the structure of the battery pressure detection sensor 300 of the third embodiment), the known frequency of the antenna for short-range communication is changed, and communication cannot be performed. Accordingly, if the antenna 810 is an antenna for short-range communication, the battery pressure detection sensor 830 is composed of the battery pressure detection sensors 100 and 200 of the first or second embodiment.

The battery pressure detection sensor 830 is connected to the antenna terminal 820. Both ends of the battery pressure detection sensor 830 are connected to a pair of terminals constituting the antenna terminal 820, respectively. The battery pressure detection sensor 830 outputs an output value to the antenna terminal 820. The antenna terminal 820 transmits an output value to the central processing unit 840 through a bus.

The central processing unit 840 is connected to the antenna terminal 820. The central processing unit 840 receives the output value of the battery pressure sensor 830 through the antenna terminal 820. The central processing unit 840 receives one of a linear resistance value and a switching event from the battery pressure sensor 830.

The central processing unit 840 controls charging of the battery 10 based on an output value transmitted from the battery pressure sensor 830. The central processing unit 840 controls battery charging in an event method or a multi-step method based on an output value.

The central processing unit 840 blocks charging of the battery 10 when the output value of the battery pressure sensor 830 is a switching event. When receiving an output value that is a switching event, the central processing unit 840 determines that the battery 10 is in a state in which ignition or explosion may occur and blocks charging of the battery 10.

If the output value of the battery pressure detection sensor 830 is a linear resistance value, the central processing unit 840 controls charging of the battery 10 by comparing the output value and a reference value. The central processing unit 840 controls charging of the battery 10 in stages based on a plurality of reference values and output values. The reference value is a value set to prevent ignition or explosion due to the swelling of the battery 10 and is a resistance value as an example.

The central processing unit 840 varies the charging current of the battery 10 when the battery charging is controlled in a multi-step manner. The central processing unit 840 controls to charge the battery 10 by gradually increasing or decreasing the charging current according to the linear resistance value.

The battery charging circuit 850 charges the battery 10 under the control of the central processing unit 840. The battery charging circuit 850 turns on/off charging of the battery 10 according to the control of the central processing unit 840. The battery charging circuit 850 charges the battery 10 by increasing or decreasing the charging current under the control of the central processing unit 840.

Referring to FIG. 14, the terminal according to the fourth embodiment of the present invention includes a composite antenna 910, an antenna terminal 920, a battery pressure sensor 930, a central processing unit 940, and a battery charging circuit 950. Includes.

The composite antenna 910 includes a plurality of antennas 910. As an example, the composite antenna 910 includes a short-range communication (NFC) antenna 912, an electronic payment (MST) antenna 914, and a wireless power transmission (WPC) antenna 916.

The antenna terminal 920 is composed of a plurality of terminals 920a to 920f. A pair of terminals 920a and 920b, 920c and 920d, 920e and 920f are connected to each antenna 910.

The antenna terminal 920 includes a pair of terminals 920a and 920b connected to the short-distance communication antenna 912, a pair of terminals 920c and 920d connected to the electronic payment antenna 914, and an antenna for wireless power transmission 916 ), including a pair of terminals 920e and 920f connected to each other, as an example.

The battery pressure detection sensor 930 is disposed to overlap the battery 10 mounted on the terminal. The battery pressure sensor 930 is disposed so that the battery 10 and the electrode pattern overlap.

The battery pressure sensor 930 outputs a resistance value corresponding to the pressure applied by the swelling of the battery 10. The battery pressure sensor 930 outputs a linear resistance value corresponding to the swelling of the battery 10. The battery pressure detection sensor 930 may output a switching event shorted at a resistance value exceeding a set resistance value as an output value. As an example, the battery pressure detection sensor 930 is one of the battery pressure detection sensors 930 of the first to third embodiments.

The battery pressure detection sensor 930 may output a capacitance corresponding to a pressure applied by the battery 10 swelling. The battery pressure sensor 930 outputs a linear capacitance corresponding to the swelling of the battery 10.

The battery pressure detection sensor 930 is connected to the antenna terminal 920. Both ends of the battery pressure detection sensor 930 are connected to terminals connected to different antennas 910 among a plurality of terminals constituting the antenna terminal 920. As an example, both ends of the battery pressure sensor 930 are connected to a terminal to which one end of the electronic payment antenna 910 is connected and a terminal to which the antenna for wireless power transmission 910 is connected. The battery pressure detection sensor 930 outputs an output value to the antenna terminal 920. The antenna terminal 920 transmits an output value to the central processing unit 940 through a bus.

The central processing unit 940 is connected to the antenna terminal 920. The central processing unit 940 receives the output value of the battery pressure detection sensor 930 through the antenna terminal 920. The central processing unit 940 receives an output value of one of a linear resistance value, a switching event, and a linear capacitance from the battery pressure sensor 930.

The central processing unit 940 controls charging of the battery 10 based on an output value transmitted from the battery pressure sensor 930. The central processing unit 940 controls battery charging in an event method or a multi-step method based on an output value.

The central processing unit 940 blocks charging of the battery 10 based on the output value of the battery pressure sensor 930. When receiving an output value, which is a switching event, the central processing unit 940 determines that the battery 10 is in a state in which ignition or explosion may occur, and blocks charging of the battery 10. At this time, the central processing unit 940 may block charging of the battery 10 by determining that the battery 10 is in a state in which ignition or explosion may occur when the capacitance exceeds the reference capacitance.

If the output value of the battery pressure detection sensor 930 is a linear resistance value or capacitance, the central processing unit 940 compares the output value and a reference value to control charging of the battery 10. The central processing unit 940 controls charging of the battery 10 in stages based on a plurality of reference values and output values. The reference value is a value set to prevent ignition or explosion due to swelling of the battery 10, and is an example of a resistance value or a capacitance.

The central processing unit 940 varies the charging current of the battery 10 when the battery charging is controlled in a multi-stage manner. The central processing unit 940 controls to charge the battery 10 by gradually increasing or decreasing the charging current according to a linear resistance value or capacitance.

The battery charging circuit 950 charges the battery 10 under the control of the central processing unit 940. The battery charging circuit 950 turns on/off the charging of the battery 10 under the control of the central processing unit 940. The battery charging circuit 950 charges the battery 10 by increasing or decreasing the charging current under the control of the central processing unit 940.

Meanwhile, referring to FIG. 15, the battery pressure sensor 930 may be integrally formed with the composite antenna 910. The battery pressure detection sensor 930 is formed on a printed circuit board on which a plurality of antennas 912, 914, and 916 are formed. The battery pressure sensor 930 may be integrally formed with one antenna or the antenna 910 in which the thermistor is formed.

Although the preferred embodiments according to the present invention have been described above, various modifications are possible, and those of ordinary skill in the art can make various modifications and modifications without departing from the scope of the claims of the present invention. It is understood that it can be done.

100, 200, 300, 400, 500: battery pressure sensor
110, 210, 330, 410, 510: upper electrode layer
120, 220, 420, 520: elastic layer
130, 230, 310, 430, 530: lower electrode layer
140, 240, 350, 440, 540: adhesive layer
320: piezoelectric layer 340: protective layer
610: thermistor 620: thermistor terminal
630, 710, 830, 930: battery pressure sensor
640, 740, 840, 940: central processing unit
650, 750, 850, 950: battery charging circuit
720: sensor terminal 730: AD converter
810, 910: antenna 820, 920: antenna terminal

Claims (20)

delete delete delete delete delete delete delete In a terminal equipped with a battery,
A thermistor terminal connected to the thermistor mounted on the terminal;
A battery pressure sensor that overlaps the battery, is connected to the thermistor terminal, and outputs an output value corresponding to the pressure applied by the swelling of the battery; And
A central processing unit connected to the thermistor terminal and controlling charging of the battery based on an output value of the battery pressure detection sensor input through the thermistor terminal,
The thermistor is a terminal disposed in at least one of an antenna, a USB charging terminal, the central processing unit, and a power management circuit. The method of claim 8,
The battery pressure detection sensor outputs a resistance value corresponding to the pressure applied by the swelling of the battery as an output value,
The central processing unit charges the battery by varying the charging current of the battery when the output value of the battery pressure sensor is a resistance value. The method of claim 8,
The battery pressure detection sensor outputs a switching event as an output value when a resistance value corresponding to the pressure applied by the swelling of the battery exceeds a set value,
The central processing unit blocks the charging of the battery when an output value of the battery pressure sensor is a switching event. delete delete delete delete In a terminal equipped with a battery,
An antenna terminal connected to an antenna mounted on the terminal;
A battery pressure detection sensor disposed overlapping the battery, connected to the antenna terminal, and outputting one of a resistance value, a switching event, and a capacitance corresponding to a pressure applied by the swelling of the battery as an output value; And
And a central processing unit connected to the antenna terminal and controlling charging of the battery based on an output value of the battery pressure sensor input through the antenna terminal. The method of claim 15,
The antenna terminal is a terminal connected to one of an antenna for electronic payment, an antenna for wireless power transmission, and an antenna for short-range communication. The method of claim 16,
The battery pressure detection sensor is a terminal for outputting a switching event as an output value when an antenna connected to the antenna terminal is a short-range communication antenna, and a resistance value corresponding to a pressure applied by the swelling of the battery exceeds a set value. The method of claim 15,
The antenna terminal includes a plurality of terminals connected to a plurality of antennas, and the battery pressure sensor is connected to terminals connected to different antennas among the plurality of terminals. The method of claim 15,
The central processing unit,
Terminal for blocking charging of the battery when the output value of the battery pressure sensor exceeds a set value. The method of claim 15,
The central processing unit,
A terminal configured to charge the battery by varying a charging current of the battery based on an output value of the battery pressure sensor and a plurality of reference values.

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