KR20070044544A - Battery protection circuit module of hybrid chip type - Google Patents

Abstract

In the hybrid chip type battery protection circuit module according to the present invention, the protection circuit elements for controlling the supply state of the current by sensing the overcharge state, the over discharge state or the overcurrent state of the battery are mounted on the upper surface, and the first terminal pattern is formed on the bottom surface. A first substrate portion; And a second substrate portion on which the first substrate portion is mounted, and a second terminal pattern which is energized with the first terminal pattern in contact with the mounting surface and provides a contact surface with an external terminal is formed. In addition, the protection circuit device according to the invention is characterized in that it comprises a control unit, a switch unit and a circuit unit, wherein the switch unit is characterized in that it is provided with two switching elements connected between the positive power terminal and the negative power terminal in turn. It is done.

According to the present invention, the protection circuit module can be uniformly mounted irrespective of the type of the mobile communication terminal product, thereby reducing the cost of developing various products, including production costs. In addition, by having a standardized hybrid type module, the size of the entire module can be made smaller, the resistance to external impact is improved, and the process quality can be uniformly managed.

Description

Battery protection circuit module of hybrid chip type

1 is a top view showing a mounting form of a conventional battery protection circuit module.

Figure 2 is a perspective view showing the mounting form of a conventional battery protection circuit module.

3 is a circuit block diagram schematically showing a circuit configuration of a hybrid chip type battery protection circuit module according to an embodiment of the present invention.

4 is a graph illustrating a comparison of a usage area according to voltage levels of a lithium-ion battery, a protection circuit, a charger, and a mobile communication terminal associated with a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention.

5 is a top view illustrating a top surface of a first substrate unit on which a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention is implemented.

FIG. 6 is a bottom view illustrating a bottom surface of a first substrate unit in which a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention is implemented.

7 is a top view illustrating a mounting form of a first substrate unit and a second substrate unit in which a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention is implemented.

<Explanation of symbols for main parts of drawing>

100: first substrate portion 110: switch unit

120: control unit 130: first resistor

140: second resistor 150: capacitor

160: the negative electrode power terminal of the first terminal pattern

170: positive power supply terminal of the first terminal pattern

180: negative battery connection terminal of the first terminal pattern

190: positive battery connection terminal of the first terminal pattern

200: second substrate portion

210: positive battery connection terminal of the second terminal pattern

220: negative battery connection terminal of the second terminal pattern

230: positive power terminal of the second terminal pattern

240: the negative power supply terminal of the second terminal pattern

The present invention relates to a battery protection circuit module.

Currently, mobile communication terminals, such as notebooks, mobile phones, smart phones, PDAs (Personal Digital Assistants), iBook phones, etc. that are portable and provide various functions in addition to communication functions, are recognized as necessities of modern people.

The mobile communication terminal provides various functions such as call function, message transmission / reception function, wireless internet function, diary function, album function, shooting / playback function, and game / entertainment function. More important is the battery.

As such batteries, lithium-ion batteries are commonly used. In particular, lithium-ion batteries have built-in battery protection circuits to secure stability and prolong life by preventing explosion, performance deterioration due to overcharging, overdischarging, and overcurrent. It is common to be.

Types of batteries include lead acid batteries, nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, and lithium-ion (lithium ion) batteries. Etc., lithium ion batteries are commonly used.

1 is a top view showing a mounting form of a conventional battery protection circuit module 10, Figure 2 is a perspective view showing a mounting form of a conventional battery protection circuit module 10.

1 and 2, the conventional battery protection circuit module 10 is largely divided into a control unit 15, circuit elements 17, 18, 19, switch unit 16 and the terminal unit 11, 12, 13, 14 Has a structure that is mounted on a substrate, the function of the battery protection circuit is as follows.

When the lithium ion battery is overcharged to about 4.5V or more, the pressure inside the battery is increased to generate heat and ignite.

In addition, when the lithium ion battery is overdischarged to about 2.7V or less, lithium is over-discharged, and the active material of the electrode reacts with the electrolyte to dissolve.

Therefore, the battery protection circuit prevents the battery from being overcharged to about 4.35V or more, and when the battery falls below about 4.0V, the battery protection circuit is switched to a state capable of charging and prevents the battery from being over discharged to about 2.3V or less.

In addition, when an overcurrent occurs due to an overload of a lithium ion battery or a power set of a mobile communication terminal (hereinafter, referred to as a "power set"), the battery protection circuit performs a function of shutting off power.

In order to perform this function, the control unit 15 detects an overcharge, overdischarge, and overcurrent state, and turns on / off the switch unit 16 to apply / block power to the circuit.

The circuit elements 17, 18, and 19 protect the IC chip used as the control unit 15 and the switch unit 16 from abnormal voltage or static electricity, and perform a function of removing noise generated in the power supply unit of the IC chip. Usually, two resistors 17 and 18 and a capacitor 19 are used.

The terminal part includes a positive battery connection terminal 11, a negative battery connection terminal 12, a positive power terminal 13, and a negative power terminal 14.

As described above, the conventional battery protection circuit module 10 is a method of freely mounting components regardless of the size according to the miniaturization degree of the mobile communication terminal product, which is greatly affected by the appearance of the PCB substrate.

Therefore, since the size of the battery protection circuit module, the mounting arrangement of the circuit elements, the shape of the board, the connection position of the terminal, etc. are all different according to the product, the protection circuit module must be newly developed according to the type of the mobile communication terminal product Since there is no standard, the situation is an obstacle to the miniaturization design.

In addition, due to the non-standard battery protection circuit module, the parts process and production facilities cannot be unified, which leads to an increase in production cost, and according to the model, the process quality (electrical and mechanical characteristics are not taken into account, so the reliability of each product) There is a drawback that they are all different.

In particular, when the battery protection circuit module is produced or used in a product, when the external shape of the board is temporarily deformed due to external impact, parts may be damaged or cracks may occur at soldered parts, causing an abnormality in power supply. Occurs.

Accordingly, the present invention provides a standardized layout design in consideration of the electrical and mechanical characteristics of the circuit components and implements the integration and miniaturization of the module, thereby actively responding to external shocks, providing a stable function, and providing a mobile communication terminal. It is an object of the present invention to provide a battery protection circuit module that can be uniformly mounted regardless of the type of product.

In order to achieve the above object, in the hybrid chip type battery protection circuit module according to the present invention, the protection circuit elements for controlling the supply state of the current by detecting the overcharge state, the over-discharge state or the overcurrent state of the battery is mounted on the upper surface, A first substrate portion having a first terminal pattern formed on a bottom surface thereof; And a second substrate portion on which the first substrate portion is mounted, and a second terminal pattern which is energized with the first terminal pattern in contact with the mounting surface and provides a contact surface with an external terminal is formed.

In addition, the protection circuit element of the hybrid chip type battery protection circuit module according to the present invention is characterized in that it comprises a control unit, a switch unit and a circuit unit.

In addition, the controller of the hybrid chip type battery protection circuit module according to the present invention is characterized in that the circuit is switched off by switching off the negative power terminal side switching element when an overcharge state of the battery is detected.

In addition, the controller of the hybrid chip type battery protection circuit module according to the present invention is characterized in that the circuit is switched off by switching off the negative battery connection terminal side switching element when the over-discharge state of the battery is detected.

In addition, the controller of the hybrid chip type battery protection circuit module according to the present invention is characterized in that the circuit is cut off by switching off the switching element side of the negative battery connection terminal when the overcurrent state of the battery is detected.

In addition, the controller of the hybrid chip type battery protection circuit module according to the present invention includes a first input terminal for detecting the overcharge state and the over-discharge state; A second input terminal for transmitting a first control signal of the switch unit; A third input terminal for transmitting a second control signal of the switch unit; And an IC chip forming a fourth input terminal for sensing a current state of the switch unit.

In addition, the circuit portion of the hybrid chip type battery protection circuit module according to the present invention includes a first resistor connected between the positive power supply terminal and the first input terminal; A capacitor connected between the first input terminal and the switch unit; And a second resistor connected between the fourth input terminal and the switch unit.

Hereinafter, a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. As a battery cited in the exemplary embodiment of the present invention, a lithium ion battery is used.

3 is a circuit block diagram schematically showing a circuit configuration of a hybrid chip type battery protection circuit module according to an embodiment of the present invention.

Referring to FIG. 3, the hybrid chip type battery protection circuit according to an exemplary embodiment of the present invention includes a control unit 120, a circuit unit 130, 140, 150, a switch unit 110, and a test connection terminal pattern 300, 310, 320, 330. 340 and the first terminal pattern (the second terminal pattern will be described later with reference to FIG. 7) 160, 170, 180, and 190, and the controller 120 includes one IC chip. The first terminal VDD, the second terminal VSS, the third terminal DC, the fourth terminal CC, and the fifth terminal CM are provided.

In addition, the first terminal pattern includes a positive power supply terminal 170, a negative power supply terminal 160, a positive battery connection terminal 190, and a negative battery connection terminal 180, and the switch unit 110 includes a first terminal pattern. It consists of a transistor q1 and a second transistor q2.

The circuit part includes a first resistor 130, a second resistor 140, and a capacitor 150.

First, the control unit 120, the circuit unit 130, 140, 150, the switch unit 110, the test connection terminal pattern (300, 310, 320, 330, 340) and the first terminal pattern (160, 170, 180, Looking at the circuit connection configuration between the 190, the positive battery connection terminal 190 and the negative battery connection terminal 180 is connected through a first resistor 130 and a capacitor 150 connected in series, the control unit 120 The first terminal VDD of is connected between the first resistor 130 and the capacitor 150.

The second terminal VSS of the controller 120 is connected between the capacitor 150 and the negative battery connection terminal 180, and the negative battery connection terminal 180 is the first transistor q1 and the second transistor q2. ) And the negative power supply terminal 160 is connected in series.

The first transistor q1 and the second transistor q2 are connected to the third terminal DC and the fourth terminal CC, respectively, and the cathode power terminal 160 is formed through the second resistor 140. It is energized with 5 terminals (CM).

The positive power supply terminal 170 is energized with the positive battery connection terminal 190.

The control unit 120 is implemented by integrating a plurality of OP amplifiers, oscillators, counters, logic circuits, level shifters, short detectors, delays, transistors, resistors, and the like in the IC chip. Detects overcharge and overdischarge conditions.

The second terminal VSS receives power from the controller 120, the third terminal DC transmits a control signal of the first transistor q1, and the fourth terminal CC of the second transistor. The control signal (q2) is sent.

Finally, the fifth terminal CM performs a function of detecting an overcurrent state of the switch unit 110.

When the controller 120 detects that the battery is in an over-discharge state, the control unit 120 transmits a control signal to turn off the first transistor q1 and, as the first transistor q1 is turned off, together with the positive electrode battery connection terminal 190. The circuit connecting the negative battery connection terminal 180 is cut off.

Thus, battery discharge is stopped.

When the controller 120 detects that the battery is in an overcharge state, the controller 120 transmits a control signal to turn off the second transistor q2, and according to the second transistor q2 is turned off, the positive electrode power terminal 170. And a circuit connecting the negative power supply terminal 160 are cut off.

Thus, battery charging stops.

When the first transistor q1 is turned off in this way, the detection of an overcurrent state during discharge, the detection of a state in which the positive power supply terminal 170 and the negative power supply terminal 160 are shorted with a conductive object, and the like. When the second transistor q2 is turned off, an overcurrent state is detected during charging.

When the abnormal state is released, the controller 120 turns on the first transistor q1 or the second transistor q2, and the circuit normally supplies power or charges the battery.

On the other hand, the first resistor 130 is to suppress the electrostatic discharge (ESD), overvoltage and reverse voltage phenomenon, and has a value of about 100Ω or more and less than 1KΩ, the higher the value is the overcharge detection voltage is increased. For example, if the value is 1KΩ, the maximum overcharge detection voltage is increased by 6mV.

The second resistor 140 is for protecting a circuit when an electrostatic discharge (ESD) and a charger terminal are connected in reverse. The second resistor 140 has a value of about 300Ω or more and less than 3KΩ, It is preferable that the sum of the resistance values of the two resistors 140 is 1 KΩ or more, and the capacitor 150 keeps the operation of the IC chip stable when noise occurs in the power supply.

Preferably, the capacitor 150 has a value of 0.0047 μF or more, and if less than that, the third terminal DC may be oscillated or the power may be turned off in a load short detection state, a charger reverse connection state, or an over current state. have.

In addition, the first test connection terminal 300 is connected to the first terminal (VDD) and the first resistor 130 of the control unit 120, the second test connection terminal 310 is the second terminal of the control unit 120. (VSS) and the capacitor 150 are connected.

The third test connection terminal 320 is connected to the fifth terminal CM and the second resistor 140 of the control unit 120, and the fourth test connection terminal 330 is the third terminal of the control unit 120. (DC) and the first transistor q1 of the switching unit 110, and the fifth test connection terminal 340 is connected to the fourth terminal CC and the second transistor q2 of the control unit 120. It provides the function of the terminal to test the functional operation and electrical characteristics of the protective circuit module. The second test connector 310 may be replaced with a negative battery connector 180.

4 is a graph illustrating a comparison of a usage area according to voltage levels of a lithium-ion battery, a protection circuit, a charger, and a mobile communication terminal associated with a hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention.

Referring to Fig. 4, the operating regions of the battery (battery), the protection circuit, the charger, and the power set during discharge (downward arrow) and during charging (upward arrow) are shown. The area below V corresponds to the prohibition region A1 of the battery and the overcharge prevention operation region B1 of the protection circuit, and 4.2 V to 4.35 V corresponds to the life deterioration region A2 of the battery.

In addition, 2.7V to 4.2V correspond to the available areas A3 and D of the battery and the power supply set, and 2.0V to 2.7V represent the overdischarge area A4 of the battery.

2.3V to 4.35V denotes the charging operation or the power supply operation region B2 of the protection circuit, and 2.0V to 4.2V denotes the operation region C of the charger.

5 is a top view illustrating a top surface of the first substrate unit 100 in which the hybrid chip type battery protection circuit module according to an embodiment of the present invention is implemented, and FIG. 6 is a hybrid chip type battery protection circuit module according to an embodiment of the present invention. The bottom view of the bottom surface of the first substrate portion 100 is implemented.

As described above with reference to FIGS. 3 and 4, the battery protection circuit according to the embodiment of the present invention includes the control unit 120, the circuit units 130, 140, and 150, the switch unit 110, and the first terminal. Patterns 160, 170, 180 and 190, which will be described with respect to the hybrid chip type battery protection circuit module according to the present invention with reference to FIGS.

5 and 6 illustrate the first substrate unit 100 of the hybrid chip type battery protection circuit module according to the present invention. Referring to FIG. 5, the upper surface of the first substrate unit 100 includes a controller 120 and a switch. The unit 110, the first resistor 130, the second resistor 140, and the capacitor 150 are mounted.

The switch unit 110 is mounted on the bottom left side of the first substrate unit 100, and the control unit 120 is mounted on the right side of the switch unit 110, and the first resistor 130 and the capacitor are sequentially disposed upward. (150), the second resistor 140 is mounted, and this arrangement design structure takes into account the electrical characteristics, mechanical characteristics (for example, against physical impact) and the connection method of each device.

According to FIG. 6, a first terminal pattern is formed on a bottom surface of the first substrate part 100, and a positive battery connection terminal 190 is mounted on the upper left side, and a positive power terminal 170 is mounted on the right side thereof. Underneath, the negative electrode battery connection terminal 180 is mounted.

The negative electrode power terminal 160 is mounted in the remaining area of the first substrate part 100.

The positive electrode battery connection terminal 190, the negative battery connection terminal 180, the positive power terminal 170, and the negative power terminal 160 formed on the bottom surface of the first substrate part 100 are mounted on the upper surface through via holes. It has a structure that is energized with the elements.

7 is a top view illustrating a mounting form of the first substrate unit 100 and the second substrate unit 200 in which the hybrid chip type battery protection circuit module according to an exemplary embodiment of the present invention is implemented.

Referring to FIG. 7, the first substrate part 100 and the second terminal pattern are mounted on an upper surface of the second substrate part. The second terminal pattern is connected to the positive battery connection terminal 210 and the negative battery connection like the first terminal pattern. Comprising a terminal 220, a positive power terminal 230 and a negative power terminal 240, the positive battery connection terminal 190, the negative battery connection terminal 190 of the first terminal pattern in contact with the second substrate 200 ( 180, the positive power supply terminal 170 and the negative power supply terminal 160 are respectively the positive battery connection terminal 210, the negative battery connection terminal 220, the positive power supply terminal 230 and the negative power supply terminal of the second terminal pattern ( 240) and the transmission line.

Therefore, when the hybrid chip type battery protection circuit module according to the present invention is mounted in the mobile communication terminal, the second terminal patterns 210, 220, 230, and 240 are energized with external terminals.

The first substrate 100 may be molded after each component is mounted on an upper surface thereof, thereby protecting the device and the connection part and improving resistance to external impact.

In addition, since the elements constituting the protection circuit are integrated in the first substrate 100, the positive electrode battery connection terminal 210, the negative electrode battery connection terminal 220, and the positive electrode power supply terminal 230 of the second terminal pattern. And the negative electrode power supply terminal 240 may be formed to have a larger area than the conventional structure, which improves the contact with the external terminal and the probability of breakage or cracking when the second substrate portion 200 is bent much more. It has less effect.

The first substrate part 100 is mounted on the second substrate part 200, and the positive electrode battery connection terminal 210 and the positive electrode power terminal 230 of the second terminal pattern are formed on the left side thereof, and the right side of the first substrate part 100 is formed on the second substrate part 200. It is preferable that the negative electrode battery terminal 220 and the negative electrode power terminal 240 of the two-terminal pattern are formed.

Thus, the battery protection circuit module according to the present invention forms a hybrid chip through the structure in which the first substrate 100 is mounted on the second substrate 200.

The present invention has been described above with reference to the preferred embodiments, which are merely examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not possible that are not illustrated above. For example, each component specifically shown in the embodiment of the present invention can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Hybrid chip type battery protection circuit module according to the present invention has the following effects.

First, since passive elements and IC chips constituting the battery protection circuit are mounted in a standardized form in consideration of electrical and mechanical characteristics, they can be unified regardless of the type of mobile communication terminal product, thus reducing production costs. In addition, the cost of developing various products can be reduced.

Second, by having a standardized hybrid type module can reduce the size of the entire module, there is an effect that the resistance to external impact is improved.

Third, as the battery protection circuit module is standardized, it is possible to more easily design a mobile communication terminal product, thereby reducing the overall development cost and production cost.

Fourth, the process quality can be managed uniformly, and there is an effect that can solve the difficulties caused by various model management.

Claims (14)

A first substrate portion having a protective circuit element mounted on an upper surface thereof to detect an overcharge state, an over-discharge state, or an overcurrent state of the battery, and having a first terminal pattern formed on a bottom surface thereof; And And a second substrate portion on which the first substrate portion is mounted, and a second terminal pattern is formed through which the first terminal pattern is brought into contact with the mounting surface and provides a contact surface with an external terminal. The method of claim 1, wherein the protection circuit element Hybrid chip type battery protection circuit module comprising a control unit, a switch unit and a circuit unit. The method of claim 2, wherein the switch unit Hybrid chip type battery protection circuit module characterized in that it is provided with two switching elements connected between the positive power terminal and the negative power terminal in turn. The method of claim 3, wherein the switching device Hybrid chip type battery protection circuit module, characterized in that each provided with a transistor. The method of claim 3, wherein the control unit The hybrid chip type battery protection circuit module, characterized in that to cut off the circuit by switching off the negative power terminal side switching element when the overcharge state of the battery is detected. The method of claim 3, wherein the control unit The hybrid chip type battery protection circuit module, characterized in that to cut off the circuit by turning off the switching element side of the negative battery connection terminal when the over-discharge state of the battery is detected. The method of claim 3, wherein the control unit And detecting an overcurrent state of the battery to turn off the switching element on the negative battery connection terminal to cut off the circuit. The method of claim 2, wherein the control unit A first input terminal for detecting the overcharge state and the overdischarge state; A second input terminal for transmitting a first control signal of the switch unit; A third input terminal for transmitting a second control signal of the switch unit; And Hybrid chip type battery protection circuit module, characterized in that the IC chip to form a fourth input terminal for detecting the current state of the switch unit. The method of claim 7, wherein the circuit portion A first resistor connected between the positive power supply terminal and the first input terminal; A capacitor connected between the first input terminal and the switch unit; And And a second resistor connected between the fourth input terminal and the switch unit. The method of claim 1, wherein the first terminal pattern and the second terminal pattern The hybrid chip type battery protection circuit module, characterized in that it comprises a positive battery connection terminal and a negative battery connection terminal, respectively. The method of claim 1, wherein the first terminal pattern and the second terminal pattern A hybrid chip type battery protection circuit module comprising a positive power input and output terminal and a negative power input and output terminal, respectively. The method of claim 1, wherein the second substrate portion And mounting the first substrate portion, and mounting the second terminal pattern on both side end regions of the first substrate portion. The method of claim 1, wherein the first substrate portion Hybrid chip type battery protection circuit module, characterized in that the molding. The method of claim 1, wherein the first substrate portion Hybrid chip type battery protection circuit module, characterized in that further comprising a test connection terminal.

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