KR20160098873A - Battery protection circuits, package of battery protection circuits module and pattery pack including the same - Google Patents

Abstract

The present invention relates to a battery protection circuit which is capable of effectively preventing an overcurrent and an overheat, and a package of a battery protection circuit which can be implemented with a compact size at low costs. The package of a battery protection circuit includes the battery protection circuit having one side electrically connected to an electrode terminal of a battery bare cell and the other side electrically connected to a charger or electronic equipment; a primary protection circuit for sensing an over-discharge and/or an overcharge to block the charge/discharge of the battery and having a first projection integrated circuit (IC) and a first group field effect transistor; and a secondary protection circuit for sensing the overcurrent and/or overheat to block the charge/discharge of the battery bare cell, electrically connected between an electrode terminal of the battery bare cell and the primary protection circuit, and having a second projection integrated circuit (IC) and a second group field effect transistor.

Description

[0001] The present invention relates to a battery protection circuit, a battery protection circuit package, and a battery pack including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery protection circuit, a battery protection circuit package, and a battery pack including the battery protection circuit. More particularly, the present invention relates to a battery protection circuit capable of effectively preventing overcurrent and overheating, To a battery pack.

Generally, batteries are used in mobile terminals such as mobile phones and PDAs. Lithium-ion batteries are the most widely used batteries in portable handsets, and they have overcharging and over-currents, and when the temperature rises due to the heat generation, the performance deteriorates as well as the risk of explosion. Accordingly, there is a growing need to provide a battery protection circuit device that detects overcharge, over-discharge, and over-current and blocks operation of the battery.

Furthermore, a PTC (Positive Temperature Coefficient) device may be additionally disposed separately from the battery protection circuit device to prevent overcurrent and overheating. The PTC element can be formed, for example, by dispersing the conductive particles in the crystalline polymer. Below the set temperature, the PTC element becomes a passage through which the current flows between the conductive connecting members. However, when the temperature exceeds the set temperature due to the occurrence of the overcurrent, the crystalline polymer swells and the resistance between the conductive particles dispersed in the crystalline polymer is separated and the resistance is rapidly increased. Accordingly, the flow of the current between the conductive connecting members is blocked or the flow of the current is reduced. Since the flow of current can be cut off by the PTC element, the PTC element serves as a safety device for preventing the battery from being ruptured. When the temperature is lower than the set temperature again, the crystalline polymer is shrunk in the PTC device and the connection between the conductive particles is restored, so that the current can flow smoothly. However, such a PTC device has a problem that the manufacturing cost is increased due to a high unit price of the component.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a battery protection circuit advantageous in integration and miniaturization while effectively preventing overcurrent and / or overheating, a battery protection circuit package and a battery pack The purpose. However, these problems are exemplary and do not limit the scope of the present invention.

A battery protection circuit package according to an aspect of the present invention can be provided. Wherein the battery protection circuit package has one side electrically connected to an electrode terminal of the battery bare cell and the other side electrically connectable to a charger or an electronic device, the battery protection circuit package comprising: a first protection circuit component; And a secondary protection circuit component. The first protection circuit component comprising: a first group of field effect transistor elements comprising a first field effect transistor element and a second field effect transistor element and having a common drain; And a first discharge cutoff signal output terminal (first D _OUT terminal) for turning off the first field effect transistor element in an overdischarge state of the battery bare cell, and a second discharge cutoff signal output terminal A first protection integrated circuit (IC) element having a first charge cutoff signal output terminal (first C _OUT terminal) for turning off the device; . The second protection circuit component comprises a second group of field effect transistor elements having a third common field effect transistor element and a fourth field effect transistor element and having a common drain; And a second discharge cut-off signal output terminal (second D _OUT terminal) for turning off the third field effect transistor element in an over-current state and / or an over-current state of the battery bare cell, And a second charge cutoff signal output terminal (second C _OUT terminal) for turning off the fourth field effect transistor element in an overcurrent state upon charging; .

In the battery protection circuit package, the second protection integrated circuit device includes a first comparator capable of sensing an overcurrent during discharging of the battery bare cell, and a second comparator connected in parallel with the first comparator, A comparator circuit including a second comparator capable of detecting an overcurrent; A control logic circuit element connected to an output terminal of the first comparator and an output terminal of the second comparator and having a logic circuit capable of performing an arithmetic operation; A first inverter circuit element having one end connected to the control logic circuit element and the other end connected to the second discharge cut-off signal output terminal (second D _OUT terminal), one end connected to the control logic circuit element, And a second inverter circuit element connected to the second charge cutoff signal output terminal (second C _OUT terminal).

In the battery protection circuit package, the comparison circuit element may further include a third comparator connected in parallel with the first comparator and the second comparator and capable of sensing overheating of the battery bare cell, The logic circuit element may have a logic circuit connected to an output terminal of the first comparator, an output terminal of the second comparator, and an output terminal of the third comparator to perform an arithmetic operation.

In the battery protection circuit package, the first protection integrated circuit device includes a first VDD terminal for applying a charge voltage and a discharge voltage and sensing a voltage of the battery bare cell, a first VSS terminal And a first sensing terminal (V- terminal) for sensing charge / discharge and overcurrent of the battery bare cell, wherein the second protection integrated circuit device is connected to the first VDD terminal, A second VDD terminal for applying a discharge voltage and sensing a voltage of the battery bare cell, a second VSS terminal for a reference to an internal operating voltage, and a second VSS terminal for sensing an overcurrent state during charging or discharging of the battery bare cell. A first sensing terminal (CS terminal) connected to the first comparator and the second comparator, and a second comparator connected to the third comparator for sensing overheating of the battery bare cell, A second detection result that the terminal (THS terminal) may be further provided.

The battery protection circuit package may further include a thermistor having one end connected to one of the electrode terminals of the battery bare cell and the other end connected to the second sensing terminal (THS terminal).

In the battery protection circuit package, the first protection integrated circuit element and the second protection integrated circuit element may be integrated into one chip, respectively.

Wherein the battery protection circuit package includes a plurality of leads spaced apart from each other and electrically connected to an electrode terminal of the battery bare cell, and wherein the first protection circuit component and the second protection circuit component are mounted, frame; And at least one of the first group of field effect transistor elements, the first protection integrated circuit element, the second group of field effect transistor elements, the second protection integrated circuit element, and the plurality of leads The battery protection circuit can be configured without using a separate printed circuit board.

In the battery protection circuit package, the first group of field effect transistor elements, the first protection integrated circuit elements, the second group of field effect transistor elements, and the second protection integrated circuit elements are separately formed on the lead frame In a form of a chip die which is not sealed with a separate encapsulant on at least a part of the surface of the lead frame by a surface mounting technique, have. The electrical connecting member may include a bonding wire or a bonding ribbon.

In the battery protection circuit package, the lead frame may include lead portions for the first internal connection terminal and a lead for the second internal connection terminal, which are respectively disposed at both edge portions and are directly connected to the electrode terminals of the battery bare cell. A lead for an external connection terminal, which is disposed between the lead for the first internal connection terminal and the lead for the second internal connection terminal and constitutes a plurality of external connection terminals; And a plurality of field effect transistor elements arranged between the leads for the first internal connection terminal and the leads for the second internal connection terminal, the first group of field effect transistor elements, the first protection integrated circuit element, And an element mounting lead on which the second protection integrated circuit element can be mounted.

A battery protection circuit package according to another aspect of the present invention can be provided. Wherein the battery protection circuit package has one side electrically connected to the electrode terminal of the battery bare cell and the other side electrically connectable to the charger or the electronic device. A protection circuit component mounted on the substrate and integrated in a chip form; And a field effect transistor device mounted on the substrate. The protection circuit component includes a first comparator capable of sensing an overcurrent during discharging of the battery bare cell, a second comparator capable of sensing an overcurrent during charging of the battery bare cell, And a third comparator capable of sensing the output of the comparator, wherein output terminals of the selected comparator are connected in parallel; A control logic circuit element connected to an output terminal of the comparison circuit element and having a logic circuit capable of performing an arithmetic operation; And an inverter circuit element having one end connected to the control logic circuit element and the other end connected to the field effect transistor element.

A battery pack according to another aspect of the present invention can be provided. The battery pack includes a battery bare cell; And the battery protection circuit package described above in which one side is electrically connected to the electrode terminal of the battery bare cell and the other side can be electrically connected to the charger or the electronic device, A battery protection circuit may be implemented to prevent overcharge of the battery bare cell by sensing an over-current and / or an overcurrent during charging / discharging.

A battery protection circuit according to still another aspect of the present invention can be provided. The battery protection circuit is a battery protection circuit having one side electrically connected to an electrode terminal of a battery bare cell and the other side electrically connected to a charger or an electronic device. The battery protection circuit detects overdischarge and / A primary protection circuit capable of blocking a discharge and comprising a first protection integrated circuit (IC) and a first group of field effect transistors; And a second protection integrated circuit (IC), which is electrically connected between the electrode terminal of the battery bare cell and the first secondary protection circuit, and which can prevent charging / discharging of the battery bare cell by detecting an overcurrent and / And a second group of field effect transistors; . The second protection integrated circuit (IC) includes: a comparison circuit part including a comparator; A control logic circuit part having a logic circuit connected to an output terminal of the comparator and capable of performing a calculation operation; An inverter circuit part having one end connected to the output terminal of the control logic circuit and the other end connected to the second group of field effect transistors; And a control unit.

In the battery protection circuit, the comparison circuit may include a first comparator capable of sensing an overcurrent during discharging of the battery bare cell, a second comparator capable of sensing an overcurrent during charging of the battery bare cell, And a third comparator capable of detecting an overheating of the comparator, wherein output ends of the selected comparators are connected in parallel. The inverter circuit portion includes a first inverter circuit portion and a second inverter circuit portion connected in parallel to each other. The first inverter circuit portion and the second inverter circuit portion have an n-channel transistor connected in parallel to each other and having a gate and a drain, And a common gate of the n-channel transistor and the p-channel transistor is connected to the control logic circuit portion, and a common drain of the n-channel transistor and the p-channel transistor is connected to the second group of field effect transistors . The second group of field effect transistors are connected to a source connected to the electrode terminal of the battery bare cell and to the second group of field effect transistors.

According to the embodiments of the present invention described above, it is possible to provide a battery protection circuit that can effectively prevent overcurrent and overheating, and a battery protection circuit package that can be compactly implemented at a low cost. Of course, the scope of the present invention is not limited by these effects.

1 is a circuit diagram including a battery protection circuit according to an embodiment of the present invention.
2 is a circuit diagram including a battery protection circuit according to another embodiment of the present invention.
3 is a circuit diagram of a secondary protection circuit component in a battery protection circuit according to some embodiments of the present invention.
4 is a perspective view illustrating a portion of a battery protection circuit package according to another embodiment of the present invention.
5 is a perspective view illustrating a battery protection circuit package according to another embodiment of the present invention.
6 is an exploded perspective view of a battery pack having a battery protection circuit package according to still another embodiment of the present invention.
7 is a perspective view illustrating a battery protection circuit package according to a comparative example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated to", or "coupled to" Quot; coupled ", "coupled ", or " coupled ", or intervening elements may be present, directly on another element. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various circuits, elements, components, regions, layers and / or portions, these circuits, elements, components, regions, layers and / It should be understood that the present invention should not be construed as being limited thereto. These terms are only used to distinguish one circuit, element, component, region, layer or section from another circuit, element, component, region, layer or section.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

In the embodiments of the present invention, the lead frame may be divided into a structure in which the lead terminals are patterned on the metal frame, and a structure and thickness of the lead frame are different from those of the printed circuit board on which the metal wiring layer is formed.

In describing embodiments of the present invention, the same reference numerals can be used to describe the concept of a circuit from the viewpoint of a battery protection circuit, but the concept of a device or a circuit part can be described from the viewpoint of a battery protection circuit package. For example, reference numeral '150' will be referred to as a 'second protection integrated circuit' in the context of a battery protection circuit, and 'second protection integrated circuit device' in the context of a battery protection circuit package.

In describing embodiments of the present invention, an integrated circuit (IC) may mean an electronic component in which many devices are integrated into one chip to process a specific complicated function.

1 and 2 are circuit diagrams that include a battery protection circuit in accordance with some embodiments of the present invention, and FIG. 3 is a circuit diagram for a secondary protection circuit component in a battery protection circuit according to some embodiments of the present invention. to be.

1 through 3, battery protection circuits 100a and 100b to be implemented by the battery protection circuit package according to the technical idea of the present invention may be connected between the electrode terminal of the battery bare cell and the output terminal of the battery pack . The output terminal of the battery pack may be electrically connected to a charger or an electronic device. The battery protection circuit package includes first and second internal connection terminals B + and B- for connecting to an electrode terminal of a battery bare cell, an electronic device connected to a charger when charged, and an electronic device (P +, P-) for connection with a portable terminal (e.g., portable terminal, etc.). The first external connection terminal P + and the second external connection terminal P- are for power supply. Furthermore, although not shown in the drawing, the battery protection circuit package according to some embodiments of the present invention may further include a third external connection terminal CF, which is an additional external connection terminal, CF) can be used to charge the battery according to the battery by dividing the battery, and to apply the thermistor, which is a part for sensing the battery temperature during charging, and other functions can be applied and used as a terminal.

The battery protection circuits 100a and 100b according to some embodiments of the present invention include a primary protection circuit 105 and a secondary protection circuit 106. [

The first protection circuit 105 may sense overdischarge, overcharge, and / or overcurrent to block the charging / discharging of the battery bare cell. The first protection integrated circuit 120, the at least one field effect transistor 110, .

For example, the first protection circuit 105 includes a first group of field effect transistors 110, a first protection integrated circuit 120, resistors R1 and R2, and a connection structure of the capacitors C1 and C2 . The first field effect transistor 110 includes a first field effect transistor 110a and a second field effect transistor 110b having a drain common structure. The first field effect transistor 110a and the second field effect transistor 110b may be, for example, an n-channel MOSFET (Metal Oxide Semiconductor Field Transistor).

The first protection integrated circuit 120 is connected to the first internal connection terminal B + corresponding to the (+) terminal of the battery bare cell through the resistor R1 and is connected to the first node n1 through the first node n1, A terminal (VDD terminal) for sensing the voltage of the battery bare cell, a reference terminal (VSS terminal) serving as a reference for the operation voltage in the first protection integrated circuit 120, a charge / discharge and overcurrent state (A first D _OUT terminal) for turning off the first field effect transistor 110a in an overdischarged state, a first discharge cutoff signal output terminal (first D _OUT terminal) for turning off the first field effect transistor 110a in an overdischarged state, (First C _OUT terminal) for turning off the second charge blocking signal 110b.

Inside the first protection integrated circuit 120, a reference voltage setting unit, a comparison unit for comparing the reference voltage with the charge / discharge voltage, an overcurrent detection unit, and a charge / discharge detection unit are provided. Here, the criterion for determining the state of charge and discharge can be changed to the specification (SPEC) requested by the user. According to the predetermined criterion, the voltage difference of each terminal of the first protection integrated circuit 120 is recognized and the charge / do.

When the first protection integrated circuit 120 reaches the over-discharge state at the time of discharging, the first discharge cut-off signal output terminal (the first D _OUT terminal) becomes LOW to turn off the first field effect transistor 110a The first charge cut-off signal output terminal (first C _OUT terminal) becomes LOW to turn off the second field effect transistor 110b. When the overcurrent flows, the second charge cutoff signal output terminal The field effect transistor 110b is turned off, and the first field effect transistor 110a is turned off in discharging.

The resistor R1 and the capacitor C1 serve to stabilize the variation of the power supply of the first protection integrated circuit 120. [ The resistor R1 is connected between the first node n1 which is the power supply node of the battery and the VDD terminal of the first protection integrated circuit 120 and the capacitor C1 is connected to the VDD of the first protection integrated circuit 120 Terminal of the first protection integrated circuit 120 and the VSS Terminal. Here, the first node n1 is connected to the first internal connection terminal B + and the first external connection terminal P +. When the resistance value of the resistor R1 is increased, the detection voltage becomes higher due to the current penetrated into the first protection integrated circuit 120 at the time of voltage detection, so that the resistance value of the resistor R1 can be set to an appropriate value of 1 K or less have. Also, for stable operation, the capacitance value of the capacitor C1 may have an appropriate value of 0.01 mu F or more.

The resistor R1 and the resistor R2 become a current limiting resistor when the high voltage charger or the charger exceeding the absolute maximum rating of the first protection integrated circuit 120 is connected upside down. The resistor R2 is connected between the terminal V- of the first protection integrated circuit 120 and the second node n2 connected to the source terminal S2 of the second field effect transistor element 110b. The sum of the resistance value in the resistor R1 and the resistance value in the resistor R2 may be set to be larger than 1 K? Since the resistor R1 and the resistor R2 may cause power consumption. If the resistance value of the resistor R2 is too large, the resistance value of the resistor R2 may be set to a value of 10 K or less since the return may not occur after the overcharge cutoff.

The capacitor C2 is connected between the second node n2 (or the second external connection terminal P-) and the source terminal S1 (or the VSS terminal) of the first field effect transistor 110a . The capacitor C2 does not significantly affect the characteristics of the battery protection circuit product, but is added for user's request or stability. The capacitor C2 is for stabilizing the system by improving the resistance to voltage fluctuation and external noise.

Although not shown in the drawing, a structure in which resistors and varistors are connected in parallel to each other for protection of ESD (Electrostatic Discharge) and surge is connected between a third external connection terminal CF and the second node n2 2 external connection terminals P-). The varistor device has a low resistance when overvoltage is generated. When the overvoltage is generated, the resistance is lowered to minimize circuit damage due to overvoltage.

In the battery protection circuits 100a and 100b to be implemented by the battery protection circuit package of the present invention described above, the configuration and the number of the field effect transistor 110, the first protection integrated circuit 120 and the passive elements (resistors and capacitors) , Arrangement and the like are exemplary and can be appropriately modified in accordance with the additional function of the protection circuit.

The battery protection circuit 100a or 100b to be implemented by the battery protection circuit package of the present invention includes a secondary protection circuit 106 electrically connected between the primary protection circuit 105 and the electrode terminal of the battery bare cell ). The secondary protection circuit 106 is configured to detect overcurrent and / or overheat and to prevent charging and discharging of the battery bare cell.

The second protection circuit 106 includes a second group of field effect transistors 170 and a second protection integrated circuit 150.

The second group of field effect transistors 170 may include a third field effect transistor 170a and a fourth field effect transistor 170b having a drain in common. The third field effect transistor 170a and the fourth field effect transistor 170b may be formed of, for example, an n-channel transistor. The second group of field-effect transistors 170 may be composed of, for example, an n-channel dual MOSFET. In this case, the source S1 of the third field effect transistor 170a is connected to the electrode terminal B- of the battery bare cell, and the source S2 of the fourth field effect transistor 170b is connected to the first field effect transistor 170b. May be coupled to the source (S1) of the second transistor (110a). Additional capacitors may be interposed between the source S1 of the third field effect transistor 170a and the source S2 of the fourth field effect transistor 170b.

The second protection integrated circuit 150 includes a comparison circuit part 152 including a comparator; A control logic circuit part 154 having a logic circuit connected to an output terminal of the comparator and capable of performing a calculation operation; And inverter circuit portions 156 and 157, one end of which is connected to the output terminal of the control logic circuit portion 154 and the other end is connected to the second group of field effect transistors 170.

Specifically, the comparison circuit 152 includes a first comparator 152a that can sense an overcurrent during discharging of the battery bare cell, a second comparator 152b that can sense an overcurrent when charging the battery bare cell, And a third comparator 152c capable of detecting overheating of the bare cell. The outputs of the two or more selected comparators are connected in parallel to the control logic circuit unit 154. [

The comparator has the meaning of a comparator, and can perform the same operation as a switch by comparing the magnitude of two signal voltages accurately. The OP amplifier has two input terminals and can be used as a comparator in that the voltage gain is large.

For example, a predetermined reference voltage is input to an inverting input terminal (-, inverting input terminal) of the OP amplifier applied to the first comparator 152a, and a non-inverting input terminal (+ inverting input terminal, the voltage applied through the terminal CS is adjusted during the discharge of the battery bare cell.

A predetermined reference voltage is input to the inverting input terminal of the OP amplifier applied to the second comparator 152b by the independent voltage source 152e and the non- inverting input terminal, the voltage applied through the terminal CS is regulated during the charging process of the battery bare cell.

A predetermined reference voltage is input to the inverting input terminal of the OP amplifier applied to the third comparator 152c by an independent voltage source 152f and a non-inverting input terminal + inverting input terminal is controlled by a voltage applied through a terminal THS connected to the thermistor 160 during charging / discharging of the battery bare cell. The thermistor 160 is connected to the positive terminal of the battery bare cell and the first internal connection terminal B +.

The control logic circuitry 154 may, for example, have logic circuitry capable of performing an OR operation. By the OR operation of the control logic circuit unit 154, an overcurrent during discharging; Overcurrent during charging; And overheating; The charging and discharging of the battery can be blocked even if at least one of them is detected.

The inverter circuit portions 156 and 157 include a first inverter circuit portion 156 and a second inverter circuit portion 157 connected in parallel to each other. The first inverter circuit portion 156 and the second inverter circuit portion 157 include a gate And n-channel transistors 156b and 157b and p-channel transistors 156a and 157a having drains in common and connected in parallel to each other. A common gate of the n-channel transistor 156b and the p-channel transistor 156a in the first inverter circuit portion 156 is connected to the control logic circuit portion 154. The common gate of the n-channel transistor 156b and the p- And the drain is connected to the third field effect transistor 170a through the second discharge cut-off signal output terminal (second D _OUT terminal). A common gate of the n-channel transistor 157b and the p-channel transistor 157a in the second inverter circuit portion 157 is connected to the control logic circuit portion 154 and is connected to the common gate of the n- And the drain is connected to the fourth field effect transistor 170b through a second charge cutoff signal output terminal (second C _OUT terminal).

Also, the second protection integrated circuit 150 may include at least one terminal VDD, VSS, CS, THS, Dout, and Cout for electrically connecting with other circuits. Specifically, the second protection integrated circuit 150 includes a second discharge cut-off signal output terminal (second D _OUT (1)) for turning off the third field effect transistor 170a in an over-current state and / And a second charge cutoff signal output terminal (second C _OUT terminal) for turning off the fourth field effect transistor 170b in an overheated state of the battery bare cell and / or an overcurrent state upon charging. The second protection integrated circuit 150 includes a second VDD terminal connected to the first VDD terminal of the first protection integrated circuit 120 for applying a charging voltage and a discharging voltage and sensing a voltage of the battery bare cell, And a second comparator 152b connected to the first comparator 152a and the second comparator 152b to sense an overcurrent state at the time of charging or discharging the battery bare cell, CS terminal) and a second sensing terminal (THS terminal) connected to the third comparator 152c to sense overheating of the battery bare cell.

According to the configuration of the second protection circuit 106 described above, when an overcurrent during discharge is detected, an overcurrent during charging is detected, or overheat is detected by comparing with a predetermined set value, the second group of field effect transistors The battery 170 may be turned off to prevent the battery cell from being charged or discharged. In addition, when the overcurrent is not detected during discharging, the overcurrent during charging is not detected, and the overheat is not detected, the field effect transistor 170 of the second group does not interrupt the current as compared with the predetermined set value Charging and discharging of the battery bare cell can be performed.

Table 1 is a table showing the operation configuration of the second protection circuit 106 under various conditions.

condition Blocking action Return condition Over current detection during discharging D _out : Low
C _out : High Vcs <first set voltage Over current detection during charging D _out : High
C _out : Low Vcs> Second setting voltage Overheat detection D _out : Low
C _out : Low Vths <third set voltage Overcharge detection D _out : High
C _out : Low Vdd <fourth set voltage

Referring to Table 1, the comparison circuit unit 152, the control logic circuit unit 154, and the inverter circuit units 156 and 156, respectively, when detecting an overcurrent during discharging through the terminal CS of the second protection integrated circuit 150, The second discharge cut-off signal output terminal (second D _OUT terminal) is set low to turn off the third field effect transistor 170a, thereby disabling the discharge of the battery. When the terminal CS of the second protection integrated circuit 150 is lower than a predetermined first set voltage (for example, 35 mV ± 5 mV) by connecting the charger and returning to the charging mode or removing the load SET, A return after overcurrent shutdown is implemented.

The control logic unit 154 and the inverter circuit units 156 and 157 are sequentially connected to the second protection integrated circuit 150 through the terminals CS of the second protection integrated circuit 150, The second charge cutoff signal output terminal (second C _OUT terminal) is set to Low to turn off the fourth field effect transistor 170b, thereby blocking the charging of the battery. (CS) voltage of the second protection integrated circuit 150 is lower than a predetermined second set voltage (for example, -35 mV ± 5 mV) by disconnecting the charger and returning to the discharge mode or connecting the load SET The return is implemented after the overcurrent shutoff.

The control logic circuit section 154 and the inverter circuit sections 156 and 157 are sequentially connected to the second discharge control circuit 152 through the second discharge protection circuit 150. In the case where the overheat is sensed through the terminal THS of the second protection integrated circuit 150, The blocking signal output terminal (the second D _OUT terminal) and the second charge cutoff signal output terminal (the second C _OUT terminal) are set low to turn on the third field effect transistor 170a and the fourth field effect transistor 170b Off of the battery to prevent the battery from being charged or discharged. When the terminal THS voltage of the second protection integrated circuit 150 becomes smaller than a predetermined third set voltage (for example, the voltage detected by the thermistor 160) due to the decrease in the detection temperature, Is implemented.

The control logic circuit section 154 and the inverter circuit sections 156 and 157 are sequentially connected to the second charging circuit section 150 through the terminal THS of the second protection integrated circuit 150, The blocking signal output terminal (second C _OUT terminal) is set to low to turn off the fourth field effect transistor 170b, thereby blocking the charging of the battery. Again, when the terminal VDD voltage of the second protection integrated circuit 150 becomes smaller than a predetermined fourth set voltage (for example, 4 to 5 V ± 20 mV), the return is implemented after the overcharge cutoff.

The second protection integrated circuit 150 described above may be provided in the form of a direct circuit (IC). For example, elements that implement the comparison circuit part 152, the control logic circuit part 154, and the inverter circuit part 156 may be provided integrated in one chip.

According to the second protection circuit 106 composed of the second protection integrated circuit 150 and the second group of field effect transistors 170 which have been described so far, a PTC (Positive Temperature Coefficient) element of a high price is not used An advantageous effect that the overcurrent and the overheat can be effectively blocked can be expected.

FIG. 4 is a perspective view illustrating a portion of a battery protection circuit package according to another embodiment of the present invention, and FIG. 5 is a perspective view illustrating a battery protection circuit package according to another embodiment of the present invention.

4 to 5, a battery (not shown) for implementing the battery protection circuits 100a and 100b of FIGS. 1 and 2 including external connection terminals P + and P- and internal connection terminals B + and B- A protection circuit package 300 is provided.

The battery protection circuit package 300 according to an embodiment of the present invention includes a plurality of spaced leads and includes a lead frame 50 electrically connected to the electrode terminals of the battery bare cell. The first protection integrated circuit device 120, the first group of field effect transistor elements 110, the second protection integrated circuit elements 150, and the second group of field effect transistor elements 170 (shown in FIGS. 1 and 2) And the passive element 130 are mounted on the lead frame 50. Here, the passive element 130 refers to the resistance element, the thermistor element and / or the capacitor element described above with reference to Figs. In particular, the second protection integrated circuit 150 may be implemented as a single chip, and the comparison circuit element 152, the control logic circuit element 154, and the inverter circuit element 156 may be integrated into the single chip .

Meanwhile, although the first group of field effect transistor elements 110 and the first protection integrated circuit elements 120 are shown as being stacked, the present invention is not limited thereto, and the first field effect transistor elements 110 and the first protection integrated circuit elements 120 may be disposed apart from each other without being stacked. In addition, although the second protection integrated circuit device 150 and the second group of field effect transistor devices 170 are shown as being stacked and disposed, the present invention is not limited thereto, and the second protection integrated circuit device 150 and the second group of field effect transistor devices 170 may be disposed apart from each other without being stacked.

In addition, the battery protection circuit package 300 according to an embodiment of the present invention includes a first protection integrated circuit device 120, a first group of field effect transistor elements 110, a second protection integrated circuit element 150, Further comprising an electrical connecting member (220) for electrically connecting any two selected from the group consisting of the field effect transistor element (170) of the second group, the passive element (130) and the plurality of leads, A battery protection circuit can be constructed without using a PCB (PCB). The electrical connection member 220 may include a bonding wire or a bonding ribbon. In the embodiments of the present invention, the lead frame may be divided into a structure in which the lead terminals are patterned on the metal frame, and a structure and thickness of the lead frame are different from those of the printed circuit board on which the metal wiring layer is formed.

The process of designing and manufacturing the lead frame 50 for constituting the battery protection circuit can be simplified because the circuit is formed by disposing the electrical connecting member 220 such as the bonding wire or the bonding ribbon on the lead frame 50 . If the electrical connecting member described in the embodiments of the present invention is not introduced in the implementation of the battery protection circuit, the configuration of the plurality of leads constituting the lead frame 50 becomes very complicated, It may not be easy to effectively provide.

A battery protection circuit package 300 according to some embodiments of the present invention includes a first protection integrated circuit device 120 mounted on a lead frame 50, a first group of field effect transistor elements 110, And a sealing member 250 for sealing the integrated circuit device 150, the second group of field effect transistor elements 170, and the passive element 130. [ The encapsulant 250 may comprise, for example, an epoxy molding compound (EMC).

On the other hand, the first protection integrated circuit device 120, the first group of field effect transistor elements 110, the second protection integrated circuit elements 150, and / or the second group of field effect transistor elements 170, Is not inserted and fixed in the form of a semiconductor package on the lead frame 50 but is mounted on at least a part of the surface of the lead frame 50 by surface mounting technology, and may be mounted and fixed in the form of a saw die chip die. Here, a chip die is a chip die, which is formed by performing a sowing process on a wafer on which a plurality of array structures (for example, a protection integrated circuit or a field effect transistor) is formed, &Lt; / RTI &gt; That is, a first protection integrated circuit device 120, a first group of field effect transistor elements 110, a second protection integrated circuit element 150, and a second group of field effect transistor elements 120, The first protection integrated circuit element 120 and the first protection integrated circuit element 120 are mounted by the sealing material 250 after the sealing material 250 is mounted in a state that the sealing material is not sealed with a separate sealing material, The second protection integrated circuit element 150 and the second group of field effect transistor elements 170 are sealed in the battery protection circuit package 300, The forming process can be performed only once. On the other hand, the first protection integrated circuit device 120, the first group of field effect transistor elements 110, the second protection integrated circuit elements 150, and the second group of field effect transistor elements 170 are connected to the printed circuit board (PCB), it is necessary to perform one molding process first for each part, and another molding process for each part mounted after mounting or mounting on a printed circuit board The manufacturing process is complicated and the manufacturing cost can be increased.

In another modified embodiment of the present invention, the passive device 130, the first protection integrated circuit device 120, the first group of field effect transistor devices 110, the second protection integrated circuit device 150, The substrate on which the second group of field effect transistor elements 170 and the like are mounted may be a printed circuit board instead of the lead frame 50 or a printed circuit board disposed on the lead frame.

6 is an exploded perspective view of a battery pack having a battery protection circuit package according to still another embodiment of the present invention.

Referring to FIG. 6, the battery protection circuit package 300 described above is inserted between the upper surface of the battery bare cell and the upper case 500 built in the battery can 400 to constitute the battery pack 600. The upper case 500 is formed with a through hole 550 in a portion corresponding to the external connection terminals P +, CF, and P- with a plastic and / or metal material.

The battery bare cell includes an electrode assembly and a cap assembly. The electrode assembly includes a positive electrode plate formed by applying a positive electrode active material to a positive electrode collector, a negative electrode plate formed by applying a negative electrode active material to a negative electrode collector, and a negative electrode plate interposed between the positive electrode plate and the negative electrode plate. The separator may be made of a separator. The positive electrode tab attached to the positive electrode plate and the negative electrode tab attached to the negative electrode plate are drawn out from the electrode assembly.

The cap assembly includes an anode terminal 410, a gasket 420, a cap plate 430, and the like. The cap plate 430 may serve as a positive electrode terminal. The cathode terminal 410 may be referred to as a cathode cell or an electrode cell. The gasket 420 may be formed of an insulating material to insulate the cathode terminal 410 from the cap plate 430. Therefore, the electrode terminal of the battery bare cell may include the negative terminal 410 and the cap plate 430.

The electrode terminal of the battery bare cell includes a plate 430 of a first polarity (e.g., an anode) and an electrode cell 410 of a second polarity (e.g., cathode) disposed centrally within the plate 430 The first internal connection terminal lead B + is connected to the plate 430 of the first polarity (for example, an anode) to be electrically connected, and the second internal connection terminal lead B- is electrically connected to the second And can be electrically connected to the electrode cell 410 of the polarity (for example, the cathode). In this case, the length of the lead frame 50 is set such that the length L (L) from one end of the plate 430 of the first polarity (for example, an anode) to the electrode cell 410 of the second polarity / 2). According to this embodiment, since the battery protection circuit package module 300 is mounted using only one side region of the upper portion with respect to the electrode cell 410 of the second polarity (for example, the cathode), the battery can be miniaturized or increased in capacity Can be implemented. For example, it is possible to contribute to miniaturization of an application product having such a battery by further forming a cell on the other side of the electrode cell 410 to increase the capacity of the battery or disposing a chip or the like having another additional function.

Hereinafter, a comparative example of the present invention in which a PTC (Positive Temperature Coefficient) element is additionally disposed in addition to the battery protection circuit package in order to block the overcurrent in the battery protection circuit element will be described, Explain.

7 is a perspective view illustrating a battery protection circuit package according to a comparative example of the present invention.

Referring to FIG. 7, in the comparative example of the present invention, a PTC structure 350 is provided instead of the secondary protection circuit component 106. That is, the second protection circuit component 106 is not installed inside the battery protection circuit package 300 shown in FIG. 7, and the PTC structure 350 is coupled to one end of the battery protection circuit package 300 .

The PTC structure 350 includes a PTC device 310 and a metal layer 320 attached to a first surface of the PTC device 310. The PTC device 350 includes an upper surface and a lower surface of the PTC device 310, (330, 340) attached to a second side of the first side (330). The metal layer 320 is bonded to one of the leads for the first internal connection terminal B + and the second internal connection terminal lead B-. The connection members 330 and 340 are electrically connected to the electrode Terminal. For example, the metal layer 320, the connecting members 330 and 340 and / or the lead frame 50 may be made of nickel, copper, nickel plated copper or other metal. The metal layer 320 is electrically connected to one of the leads for the first internal connection terminal B + and the second internal connection terminal B- by laser welding, resistance welding, soldering, and a conductive adhesive For example, conductive epoxy), and conductive tape.

The PTC (Positive Temperature Coefficient) element 310 can be formed, for example, by dispersing conductive particles in a crystalline polymer. Therefore, the PTC device 310 becomes a passage through which current flows between the metal layer 320 and the conductive connecting members 330 and 340 at a temperature below the set temperature. However, when the temperature exceeds the set temperature due to the occurrence of the overcurrent, the crystalline polymer swells and the resistance between the conductive particles dispersed in the crystalline polymer is separated and the resistance is rapidly increased. Accordingly, the flow of current between the metal layer 320 and the conductive connecting members 330 and 340 is cut off or the flow of current is reduced. Since the flow of the current can be cut off by the PTC device 310, the PTC device 310 serves as a safety device for preventing the battery from rupturing. When the temperature is lower than the set temperature again, the PTC element 310 shrinks the crystalline polymer and restores the connection between the conductive particles, so that the current flows smoothly.

The lead frame 50 constituting the battery protection circuit package 300 is electrically connected to the electrode terminal of the battery bare cell via the PTC structure. For example, the lead B- for the second internal connection terminal of the terminal lead frame 50 may be electrically connected to the negative terminal 410 of the battery bare cell via the PTC structure 350. That is, the lead (B-) for the second internal connection terminal of the lead frame 50 is joined to the metal layer 320 and is connected to the cathode of the battery bare cell via the conductive connecting members 330 and 340 via the PTC element 310 And is electrically connected to the terminal 410. In this case, the metal layer 320 is defined within the upper surface on one side of the PTC device 310, and the connecting members 330 and 340 are connected to the negative terminal 410 of the battery bare cell on the other surface of the PTC device 310, As shown in FIG.

The battery protection circuit package and the battery pack having the same according to the embodiments of the present invention have the following advantageous effects compared with the comparative example of the present invention.

First, in the embodiments of the present invention, it is possible to effectively block the overcurrent while using an electronic component having a relatively lower component cost than the PTC structure. In general, the cost of the PTC structure is high, which is a major cause of increasing the production cost of the battery protection circuit device. According to the present invention, it is expected that this problem can be effectively overcome. In addition, according to embodiments of the present invention, it is possible to replace the PTC structure disposed in association with the battery protection circuit package, as well as a fuse or OTC (Over Current Trip Coil) . &Lt; / RTI &gt;

Second, since the PTC structure is disposed outside the battery protection circuit package, a process of bonding the PTC structure and the battery protection circuit package is additionally required, and the strength of the structure may be reduced due to a failure in the bonding process. That is, a process of joining the metal layer 320 of the PTC structure 350 and the lead (B-) for the second internal connection terminal of the battery protection circuit package 300 by laser welding or resistance welding is additionally required, The structural strength of the assembly may be relatively weak. On the contrary, in the embodiments of the present invention, since the secondary protection circuit component 106 for blocking the overcurrent is sealed by the encapsulant 250 of the battery protection circuit package 300, An advantageous effect that the strength is good can be expected.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100a, 100b: battery protection circuit
105: Primary protection circuit
106: Secondary protection circuit
110: a first group of field-effect transistors
120: first protection integrated circuit
150: Second protection integrated circuit
170: a second group of field-effect transistors
152:
154: Control logic circuit
156, 157: inverter circuit section
50: Lead frame
300: Battery protection circuit package

Claims (14)

A battery protection circuit package, wherein one side is electrically connected to an electrode terminal of a battery bare cell and the other side can be electrically connected to a charger or an electronic device,
A first protection circuit component; And a secondary protection circuit component,
Wherein the first protection circuit component comprises:
A first group of field effect transistor elements comprising a first field effect transistor element and a second field effect transistor element and having a common drain; And
A first discharge cutoff signal output terminal (first D _OUT terminal) for turning off the first field effect transistor element in an overdischarge state of the battery bare cell, and a second discharge cutoff signal output terminal (First C _OUT terminal) for turning off the first charge blocking signal output terminal (first C _OUT terminal) for turning off the first charge blocking signal output terminal Lt; / RTI &gt;
Wherein the second protection circuit component comprises:
A second group of field effect transistor elements having a third common field effect transistor element and a fourth field effect transistor element and having a common drain; And
A second discharge cut-off signal output terminal (second D _OUT terminal) for turning off the third field effect transistor element in an over-current state and / or an over-current state of the battery bare cell, And a second charge blocking signal output terminal (second C _OUT terminal) for turning off the fourth field effect transistor element in an overcurrent state upon charging; / RTI &gt;
Battery protection circuit package. The method according to claim 1,
The second protection integrated circuit device
And a second comparator connected in parallel to the first comparator and capable of sensing an overcurrent during charging of the battery bare cell, device;
A control logic circuit element connected to an output terminal of the first comparator and an output terminal of the second comparator and having a logic circuit capable of performing an arithmetic operation; And
A first inverter circuit element having one end connected to the control logic circuit element and the other end connected to the second discharge cut-off signal output terminal (second D _OUT terminal), one end connected to the control logic circuit element, And a second inverter circuit element connected to the charge cutoff signal output terminal (second C _OUT terminal);
The battery protection circuit package comprising: 3. The method of claim 2,
The comparator circuit further includes a third comparator connected in parallel with the first comparator and the second comparator and capable of detecting overheating of the battery bare cell,
Wherein the control logic circuit element has a logic circuit connected to an output terminal of the first comparator, an output terminal of the second comparator, and an output terminal of the third comparator,
Battery protection circuit package. The method of claim 3,
Wherein the first protection integrated circuit device comprises:
A first VDD terminal for applying a charge voltage and a discharge voltage to sense a voltage of the battery bare cell, a first VSS terminal for a reference to an internal operating voltage, and a second VSS terminal for sensing a charge / And a first sensing terminal (V- terminal)
The second protection integrated circuit device comprising:
A second VDD terminal connected to the first VDD terminal for applying a charging voltage and a discharging voltage and sensing a voltage of the battery bare cell, a second VSS terminal for a reference for an internal operating voltage, A first sensing terminal (CS terminal) connected to the first comparator and the second comparator for detecting an overcurrent state at the time of discharging, and a second comparator connected to the third comparator for sensing overheating of the battery bare cell, And a second sensing terminal (THS terminal) connected thereto. The method of claim 3,
Further comprising a thermistor having one end connected to one of the electrode terminals of the battery bare cell and the other end connected to the second sensing terminal (THS terminal). The method according to claim 1,
Wherein the first protection integrated circuit element and the second protection integrated circuit element are integrated into one chip, respectively. The method according to claim 1,
A lead frame including a plurality of spaced leads and electrically connected to an electrode terminal of the battery bare cell, wherein the first and second protection circuit component elements and the second protection circuit component are mounted; And
Wherein at least two of the field effect transistor elements of the first group, the first protection integrated circuit element, the second group of field effect transistor elements, the second protection integrated circuit element, and the plurality of leads An electrical connecting member for electrically connecting the electrodes;
So that a battery protection circuit is constructed without using a separate printed circuit board,
Battery protection circuit package. 8. The method of claim 7,
The field effect transistor element of the first group, the first protection integrated circuit element, the second group field effect transistor element, and the second protection integrated circuit element are inserted in the form of a separate semiconductor package on the lead frame Is mounted and fixed in the form of a chip die which is not sealed with a separate encapsulant on at least a part of the surface of the lead frame by surface mount technology, but is not fixed. 8. The method of claim 7,
Wherein the electrical connecting member comprises a bonding wire or a bonding ribbon. 8. The method of claim 7,
The lead frame includes:
A lead for a first internal connection terminal and a lead for a second internal connection terminal, which are respectively disposed at both edge portions and are directly connected to the electrode terminals of the battery bare cell;
A lead for an external connection terminal, which is disposed between the lead for the first internal connection terminal and the lead for the second internal connection terminal and constitutes a plurality of external connection terminals; And
Wherein the first field effect transistor element, the second field effect transistor element, the second field effect transistor element, and the second field effect transistor element are disposed between the lead for the first internal connection terminal and the lead for the second internal connection terminal, An element mounting lead on which the second protection integrated circuit element can be mounted;
The battery protection circuit package comprising: A battery protection circuit package, wherein one side is electrically connected to an electrode terminal of a battery bare cell and the other side can be electrically connected to a charger or an electronic device,
Board;
A protection circuit component mounted on the substrate and integrated in a chip form; And
And a field effect transistor element mounted on the substrate,
The protection circuit component includes:
A second comparator capable of sensing an overcurrent during charging of the battery bare cell, and a third comparator capable of detecting overheating of the battery bare cell, A comparator circuit including at least two selected from the group consisting of a comparator and a comparator, wherein output terminals of the selected comparator are connected in parallel;
A control logic circuit element connected to an output terminal of the comparison circuit element and having a logic circuit capable of performing an arithmetic operation; And
An inverter circuit element having one end connected to the control logic circuit element and the other end connected to the field effect transistor element;
/ RTI &gt;
Battery protection circuit package. Battery bare cell; And
The battery protection circuit package according to any one of claims 1 to 11, wherein one side is electrically connected to an electrode terminal of the battery bare cell and the other side is electrically connected to a charger or an electronic device.
Wherein a battery protection circuit can be implemented to prevent overcharge and / or charge / discharge of the battery bare cell by sensing an overcurrent during overcharge and / or charge / discharge of the battery bare cell without depending on the PTC structure. A battery protection circuit in which one side is electrically connected to an electrode terminal of a battery bare cell and the other side can be electrically connected to a charger or an electronic device,
A first protection circuit, which is capable of detecting overdischarge and / or overcharge and blocking charging / discharging of the battery bare cell, and including a first protection integrated circuit (IC) and a first group of field effect transistors; And
And a second protection integrated circuit (IC), which is electrically connected between the electrode terminal of the battery bare cell and the first secondary protection circuit, and which can prevent overcharging and / or overheating of the battery bare cell, A second protection circuit comprising a second group of field effect transistors;
Lt; / RTI &gt;
The second protection integrated circuit (IC) includes: a comparison circuit part including a comparator; A control logic circuit part having a logic circuit connected to an output terminal of the comparator and capable of performing a calculation operation; An inverter circuit part having one end connected to the output terminal of the control logic circuit and the other end connected to the second group of field effect transistors; And a control unit
Battery protection circuit. 14. The method of claim 13,
The comparison circuit section
A second comparator capable of sensing an overcurrent during charging of the battery bare cell, and a third comparator capable of detecting overheating of the battery bare cell, The output of the selected comparator is connected in parallel, and the output of the selected comparator is connected in parallel,
The inverter circuit portion includes a first inverter circuit portion and a second inverter circuit portion connected in parallel to each other. The first inverter circuit portion and the second inverter circuit portion have an n-channel transistor connected in parallel to each other and having a gate and a drain, Channel transistor, wherein a common gate of the n-channel transistor and the p-channel transistor is connected to the control logic circuit section, and a common drain of the n-channel transistor and the p-channel transistor is connected to the field- ,
The second group of field effect transistors having a source coupled to the electrode terminal of the battery bare cell and a second group of field effect transistors coupled to the second group of field effect transistors,
Battery protection circuit.

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