KR20160109532A - Battery protection circuit module and battery pack including the same - Google Patents

Abstract

The present invention relates to a battery protection circuit module which is capable of efficiently preventing an overcurrent and overheating and being compactly implemented at low costs. The battery protection circuit module comprises: a first terminal and a second terminal, which are electrically connected to an electrode cell of a battery bare cell; a third terminal and a fourth terminal, which are electrically connected to a charger or an electronic device; a first protection circuit unit which includes at least one first transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and a first protection integrated circuit element for controlling the at least one first transistor; and a second protection circuit unit which includes at least one second transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and connected in series to the first transistor and a second protection integrated circuit element for controlling the second transistor.

Description

A battery protection circuit module, and a battery pack including the battery protection circuit module.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery for an electronic device, and more particularly, to a battery protection circuit module for protecting a battery cell and a battery pack including the battery protection circuit module.

Generally, batteries are used in electronic devices 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. Therefore, there is a growing need to provide a battery protection circuit device that cuts off the operation of the battery in order to ward off this performance deterioration.

Typically, a thermistor element, such as a PTC (Positive Temperature Coefficient) element, is additionally used in the battery protection circuit device to prevent overcurrent and overheating. Such a PTC device can be formed, for example, by dispersing conductive particles in a 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 and the size of the battery is increased because the unit price of the PTC device is high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery protection circuit module and a battery pack which are advantageous in terms of integration and miniaturization while effectively preventing overcurrent and / or overheating. However, these problems are exemplary and do not limit the scope of the present invention.

A battery protection circuit module according to one aspect of the present invention includes a first terminal and a second terminal electrically connected to an electrode terminal of a battery bare cell, a third terminal and a fourth terminal electrically connected to the charger or the electronic device, At least one first transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal, and a first protection integrated circuit for controlling the at least one first transistor, And at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and is connected in series with the at least one first transistor And a second protection integrated circuit device for controlling the second transistor.

In the battery protection circuit module, the at least one first transistor may include a first field effect transistor and a second field effect transistor connected in series with each other.

In the battery protection circuit module, the first protection circuit unit may further include at least one first passive element connected to the first protection integrated circuit element.

In the battery protection circuit module, the at least one second transistor may include a third field effect transistor and a fourth field effect transistor connected in series with each other.

In the battery protection circuit module, the second protection circuit unit may further include at least one second passive element connected to the second protection integrated circuit element.

In the battery protection circuit module, at least one of the first protection circuit unit and the second protection circuit unit may operate as an overcurrent protection to replace the Pittsy thermistor.

Wherein the first protection integrated circuit element in the first protection circuit unit controls the at least one first transistor to control overcharge and / or overdischarge of the battery bare cell, In the protection circuit unit, the two protection integrated circuit element may control the at least one second transistor to block an overcurrent flowing to the battery bare cell.

In the battery protection circuit module, the first protection circuit unit and the second protection circuit unit may be composed of the same arrangement of elements.

A battery pack according to another aspect of the present invention includes a battery bare cell and a battery protection circuit module connected to the battery bare cell. The battery protection circuit module includes a first terminal and a second terminal electrically connected to the electrode terminal of the battery bare cell, a third terminal and a fourth terminal electrically connected to the charger or the electronic device, Or at least one of the second terminals and at least one of the third terminal and the fourth terminal, and a first protection integrated circuit element for controlling the at least one first transistor And at least one first protection circuit unit connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and connected in series with the at least one first transistor, And a second protection integrated circuit element for controlling the first transistor, the second transistor, and the second transistor. .

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 schematic circuit diagram showing a battery protection circuit module according to an embodiment of the present invention.
2 is a schematic perspective view illustrating a battery protection circuit module according to an embodiment of the present invention.
3 is a perspective view illustrating a battery pack according to an embodiment 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 in various other forms, The present invention 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.

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.

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 is a schematic circuit diagram showing a battery protection circuit module according to an embodiment of the present invention.

Referring to FIG. 1, a battery protection circuit module according to this embodiment of the present invention includes a first terminal 102 and a second terminal 104 electrically connected to an electrode terminal of a battery bare cell, And may include a third terminal 106 and a fourth terminal 108 electrically connected to each other. For example, the first terminal 102 is an internal positive terminal B + connected to the positive terminal of the battery bare cell in the battery pack, and the second terminal 104 is connected to the negative terminal of the battery bare cell B-), the third terminal 106 is an external positive terminal (P +) connected to the charger of the battery pack or the positive electrode of the electronic device and the fourth terminal 108 is connected to the charger or the external May be a negative terminal (P-).

Further, although not shown in the drawings, the battery protection circuit module according to some embodiments of the present invention may further include a separate additional external connection terminal.

The first protection circuit unit 110 may include at least one of the first terminal 102 and the second terminal 104 connected between at least one of the first terminal 102 and the second terminal 104 and at least one of the third terminal 106 and the fourth terminal 108. [ 1 transistor 112 and a first protection integrated circuit device 118 for controlling the first transistor 112. [ For example, the first transistor 112 is connected between the second terminal 104 and the fourth terminal 108, and the first protection integrated circuit device 118 is at least And may be electrically connected to the gate terminal of the first transistor 112.

The second protection circuit unit 120 includes at least one of the first terminal 102 and the second terminal 104 connected between at least one of the third terminal 106 and the fourth terminal 108, 2 transistor 122 and a second protection integrated circuit device 128 for controlling the second transistor 122. [ For example, the second transistor 122 is connected between the second terminal 104 and the fourth terminal 108, and the second protection integrated circuit device 128 is connected between the second terminal 104 and the fourth terminal 108, And may be electrically connected to the gate terminal of the second transistor 122. Furthermore, the first transistor 112 and the second transistor 122 may be connected in series with each other.

The first protection circuit unit 110 and / or the second protection circuit unit 120 may sense overdischarge, overcharge, and / or overcurrent of the battery to shut off the charge / discharge or operation of the battery bare cell. The first protection circuit unit 110 and the second protection circuit unit 120 may be used complementarily. For example, the first protection circuit unit 110 and the second protection circuit unit 120 are configured in series to sense over-discharge, overcharge, and / or over-current of the battery to charge / Lt; / RTI > Accordingly, even if a problem occurs in any one of the first protection circuit unit 110 and the second protection circuit unit 120, the battery can be doubly protected using the other one.

As another example, the first protection circuit unit 110 and the second protection circuit unit 120 may be functionally separated from each other. In this case, at least one of the first protection circuit unit 110 and the second protection circuit unit 120 may be operated to replace a conventional overcurrent protection device, for example, a PTC thermistor. For example, one of the first protection circuit unit 110 and the second protection circuit unit 120 can control over discharge and overcharge of the battery and the other to sense over current.

Specifically, in the first protection circuit unit 110, the first protection integrated circuit element 118 controls the first transistor 112 to control overcharge and / or overdischarge of the battery bare cell, The second protection integrated circuit device 128 may control the second transistor 122 to block an overcurrent flowing to the battery bare cell. As another example, in the second protection circuit unit 120, the second protection integrated circuit element 128 controls the second transistor 122 to control overcharge and / or overdischarge of the battery bare cell, The first protection integrated circuit device 118 may control the first transistor 112 to block the overcurrent flowing to the battery bare cell.

Hereinafter, the configuration and operation of the first protection circuit unit 110 will be described in more detail.

The first transistor 112 may include a first field effect transistor 114 and a second field effect transistor 116 connected in series with each other. For example, the first field effect transistor 114 and the second field effect transistor 116 may be the same type, for example, an N type MOSFET (NMOSFET), and the second terminal 104 and the fourth terminal 116 may be of the same type, May be serially connected so as to share a drain with each other at a node n5 between them. Thereby, at least one reverse diode is formed between the drain and the source of the first field effect transistor 114 and the second field effect transistor 116, so that the second terminal 104 and the fourth terminal 116 The current flow can be controlled.

The first protection integrated circuit device 118 may include control logic to control the first transistor 112, e.g., the first field effect transistor 114 and the second field effect transistor 116. For example, the control logic may include 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. The charging and discharging state determination criteria can be changed to the SPEC requested by the user. The voltage difference of each terminal of the first protection integrated circuit element 118 is recognized according to the predetermined standard to determine the charge / discharge state do. For example, the first protection integrated circuit device 118 includes a reference terminal Vss, a power supply terminal Vdd, a detection terminal V-, a discharge cutoff signal output terminal Dout, And a blocking signal output terminal (Cout).

The first protection integrated circuit device 118 may be connected to the nodes n1, n3, n7 via at least one passive element. For example, the power supply terminal vdd is connected to the node n1 between the first terminal 102 and the second terminal 106 via the resistor R11, the reference terminal Vss is connected to the second terminal 104, And the node n3 between the fourth terminal 108 and the fourth terminal 108. [ A capacitor C11 may be interposed between the reference terminal Vss and the power supply terminal Vdd between the node n1 and the node n3 to prevent a short circuit between the two nodes n1 and n3. The sensing terminal V- can be connected to the node n7 via the resistor R12.

According to this configuration, the first protection integrated circuit device 118 can apply the charging voltage or the discharging voltage through the power supply terminal Vdd based on the voltage of the reference terminal Vss, Charge / discharge and over-current state can be detected.

The discharge cut-off signal output terminal Dout may be connected to the gate of the first field effect transistor 114 to control the on-off of the first transistor 112 during the discharge of the battery. The charge cutoff signal output terminal Cout may be connected to the gate of the second field effect transistor 116 to control the on-off of the first transistor 112 when the battery is charged.

The charging current flows from the third terminal 106 to the first terminal 102 and from the second terminal 104 to the fourth terminal 108 when the battery is charged. The discharging current flows from the first terminal 102 to the third terminal 106 and from the fourth terminal 108 to the second terminal 104 when the battery is discharged.

When the first protection integrated circuit device 118 senses an overcurrent or an overdischarge state during battery discharge, the first protection integrated circuit device 118 outputs a low signal through the discharge cutoff signal output terminal Dout to output the first field effect transistor 114 Off state or an overcharged state at the time of charging the battery, the second field effect transistor 116 may be operated to output a low signal through the charge cutoff signal output terminal Cout to turn off the second field effect transistor 116. Accordingly, as at least one of the first field effect transistor 114 and the second field effect transistor 116 connected in series is turned off, the circuit between the second terminal 104 and the fourth terminal 108 is cut off Overcharging, overdischarging and / or overcurrent of the battery may be interrupted.

The resistor R11 and the capacitor C11 serve to stabilize the variation of the power supply of the first protection integrated circuit device 118. [ When the resistance value of the resistor R11 is increased, the detection voltage becomes higher due to the current penetrated into the first protection integrated circuit element 118 at the time of voltage detection. Therefore, the resistance value of the resistor R11 is set to a predetermined value, Lt; / RTI > Also, for stable operation, the capacitance value of the capacitor C11 may be appropriately adjusted, and may have an appropriate value of, for example, 0.01 mu F or more.

The resistor R11 and the resistor R12 become current limiting resistors when the high voltage charger or charger exceeding the absolute maximum rating of the first protection integrated circuit element 118 is connected upside down. Since the resistor R11 and the resistor R12 may cause power consumption, the sum of the resistance value in the resistor R11 and the resistance value in the resistor R12 may be set to be larger than 1 KΩ. If the resistance value of the resistor R12 is too large, the resistance value of the resistor R12 may be set to a value of 10K or less since the return may not occur after the overcharge cutoff.

The capacitor C11 does not significantly affect the characteristics of the battery protection circuit product but is added for user's request or stability. The capacitor C11 is for stabilizing the system by improving resistance to voltage fluctuation and external noise.

Alternatively, although not shown in the drawing, a structure in which a resistor and a varistor are connected in parallel may be added for ESD (Electrostatic Discharge) and surge protection. 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. The number or arrangement of the passive elements in the first protection circuit unit 110 described above can be appropriately modified in accordance with the additional function.

Hereinafter, the configuration and operation of the second protection circuit unit 120 will be described in more detail. For example, the first protection circuit unit 110 and the second protection circuit unit 120 may be composed of elements having the same or similar circuit layout, and redundant description is omitted in this case.

The second transistor 122 may include a third field effect transistor 124 and a fourth field effect transistor 126 connected in series with each other. For example, the third field effect transistor 124 and the fourth field effect transistor 126 may be the same type, for example, an N type MOSFET (NMOSFET), and the second terminal 104 and the fourth terminal 116 may be of the same type, To share a drain with each other at a node n6 between them. Thereby, at least one reverse diode is formed between the drain and the source of the third field effect transistor 124 and the fourth field effect transistor 126, so that the second terminal 104 and the fourth terminal 116 The current flow can be controlled.

The second protection integrated circuit device 128 may include control logic to control the second transistor 122, e.g., the third field effect transistor 124 and the fourth field effect transistor 126. For example, the control logic may include 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. For example, the second protection integrated circuit device 128, May include a reference terminal Vss, a power supply terminal Vdd, a sensing terminal V-, a discharge cutoff signal output terminal Dout, and a charge cutoff signal output terminal Cout in order to output control logic.

The second protection integrated circuit device 128 may be connected to the nodes n2, n4 and n8 via at least one passive element. For example, the power supply terminal vdd is connected to the node n2 between the first terminal 102 and the second terminal 106 via the resistor R21, the reference terminal Vss is connected to the second terminal 104, And the node n4 between the fourth terminal 108 and the fourth terminal 108. [ A capacitor C21 may be interposed between the reference terminal Vss and the power supply terminal Vdd between the node n2 and the node n4 to prevent a short circuit between the two nodes n2 and n4. The sensing terminal V- can be connected to the node n8 via the resistor R22.

According to this configuration, the second protection integrated circuit device 128 can apply the charging voltage or the discharging voltage through the power supply terminal Vdd based on the voltage of the reference terminal Vss, Charge / discharge and over-current state can be detected. The second protection integrated circuit device 128 may be manufactured to have the same structure as the first protection integrated circuit device 118 due to the similarity of the functions thereof, but may be manufactured to have some differences when the additional protection functions are different from each other.

The discharge cutoff signal output terminal Dout may be connected to the gate of the third field effect transistor 124 to control the on-off of the second transistor 122 at the time of discharging the battery. The charge cutoff signal output terminal Cout may be connected to the gate of the fourth field effect transistor 126 to control the on-off of the second transistor 122 upon charging of the battery.

The second protection integrated circuit device 128 outputs a low signal through the discharge cutoff signal output terminal Dout to generate the third field effect transistor 124 when the overcurrent or overdischarge state is detected during battery discharge. Off state or an overcharged state at the time of charging the battery, and outputs a low signal through the charge cut-off signal output terminal Cout to turn off the fourth field-effect transistor 126. Thus, as at least one of the third field effect transistor 124 and the fourth field effect transistor 126 connected in series is turned off, the circuit between the second terminal 104 and the fourth terminal 108 is cut off Overcharging, overdischarging and / or overcurrent of the battery may be interrupted.

The resistors R21 and R22 and the capacitor C21 can refer to the resistors R11 and R12 of the first protection circuit unit 110 and the capacitor C11 and therefore redundant description is omitted. The values of the resistors R21 and R22 and the capacitor C21 in the second protection circuit unit 120 may be equal to the values of the resistors R11 and R12 of the first protection circuit unit 110 and the value of the capacitor C11, It may be different for fine tuning.

Alternatively, although not shown in the drawing, a structure in which a resistor and a varistor are connected in parallel may be added for ESD (Electrostatic Discharge) and surge protection. The number or arrangement of the passive elements in the second protection circuit unit 120 described above can be appropriately modified in accordance with the additional function.

According to the dual protection circuit configuration of the present invention, since the battery bare cell is protected by using the double protection structure of the first and second protection circuit units 110 and 120, the conventional overcurrent or overheat protection device, The PTC thermistor or the bimetallic junction structure can be omitted, so that the total volume can be reduced. Since the first and second protection circuit units 110 and 120 can be realized as a semiconductor chip, it is possible to manufacture the protection circuit units in micro or nanometer units using a silicon process technology.

For example, not only can the first protection integrated circuit device 118, the second protection integrated circuit device, and the first to fourth field effect transistors 114, 116, 124 and 126 be manufactured as semiconductor chips, Devices, such as resistors R11, R12, R21, R22, and capacitors C11, C21, may also be fabricated in chip form. Such a chip structure can be easily mounted on a substrate using surface mounting technology (SMT).

In some embodiments of the present invention, the first protection circuit unit 110 and the second protection circuit unit 120 can protect the battery bare cell in a double manner while performing almost the same function as each other. In this case, the first protection circuit unit 110 and the second protection circuit unit 120 can have almost the same circuit elements and circuit arrangements.

In some other embodiments of the present invention, the first protection circuit unit 110 and the second protection circuit unit 120 may perform additional or different functions while performing the same or similar functions with each other. In this case, the first protection circuit unit 110 and the second protection circuit unit 120 have substantially similar circuit elements and circuit arrangement, but may have additional distinction.

In the embodiments of the present invention described above, since the first protection circuit unit 110 and the second protection circuit unit 120 are dual-added, the number of NMOSFETs is doubled to increase the internal resistance. Accordingly, the first to fourth field-effect transistors 114, 116, 124, and 126 may be fabricated two to three times larger than conventional ones to reduce the internal resistance to a conventional level. In this case, however, the sizes and specifications of the first to fourth field effect transistors 114, 116, 124 and 126 may be the same or different from each other.

2 is a perspective view schematically showing a battery protection circuit module according to an embodiment of the present invention.

Referring to FIG. 2, the first protection circuit unit 110 and the second protection circuit unit 120 may be mounted on the substrate 50. For example, the substrate 50 may comprise a printed circuit board or a leadframe. The first protection circuit unit 110 and the second protection circuit unit 120 may be sealed in a single package using the molding material 55.

The first protection circuit unit 110 and the second protection circuit unit 120 are respectively formed on the substrate 50 in the form of a chip scale package (CSP) in order to reduce the volume thereof, And may be mounted. In this case, the first protection circuit unit 110 and the second protection circuit unit 120 may be packaged and mounted on the substrate 50, respectively.

In another variation of this embodiment, the first field effect transistor 114, the second field effect transistor 116 and the first protection integrated circuit element 118 in the first protection circuit unit 110 are connected to the first field effect transistor 114, Or a package on package (POP) structure in which a first protection integrated circuit element 118 is stacked on the transistor 114 and the second field effect transistor 116 .

3 is a schematic exploded perspective view showing a battery pack according to an embodiment of the present invention.

Referring to FIG. 3, the battery protection circuit module 300 is inserted between the upper surface of the battery bare cell and the upper case 500, and the battery pack 600 is formed. The upper case 500 is formed with a through hole 550 in a portion corresponding to the external connection terminals P + and P- so that the external connection terminals P + and P- can be exposed by plastic and / or metal.

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, As shown in Fig. A positive electrode tab attached to the positive electrode plate and a 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.

The battery protection circuit module and the battery pack having the battery protection circuit module according to the embodiments of the present invention have the following advantages as compared with the conventional overcurrent or overheat protection device, for example, a product using the PTC thermistor.

First, in the embodiments of the present invention, it is possible to effectively prevent the overcurrent while using an electronic component having a relatively lower component price than the PTC thermistor. In general, the unit price of PTC thermistor 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.

Second, since the PTC thermistor is disposed outside the battery protection circuit package, a process of bonding the PTC thermistor and the battery protection circuit package is additionally required, and the strength of the structure may be reduced due to the failure in the bonding process. That is, a process of joining the metal layer of the PTC thermistor and the lead of the battery protection circuit module by laser welding or resistance welding is additionally required, and the structural strength of the bonded assembly may be relatively weak.

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.

110, 120: Battery protection circuit unit
118, 128: Protection integrated circuit device
114, 116, 124, 126: field effect transistor

Claims (10)

A first terminal and a second terminal electrically connected to an electrode terminal of the battery bare cell;
A third terminal and a fourth terminal electrically connected to the charger or the electronic device;
At least one first transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal, and a first protection integrated circuit for controlling the at least one first transistor, A first protection circuit unit including a circuit element; And
At least one second transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and in series with the at least one first transistor, And a second protection integrated circuit element for controlling the second protection circuit element.
Battery protection circuit module. The method according to claim 1,
Wherein the at least one first transistor comprises a first field effect transistor and a second field effect transistor connected in series with each other. 3. The method of claim 2,
Wherein the first protection circuit unit further comprises at least one first passive element connected to the first protection integrated circuit element. 3. The method according to claim 1 or 2,
Wherein the at least one second transistor comprises a third field effect transistor and a fourth field effect transistor connected in series with each other. 5. The method of claim 4,
Wherein the second protection circuit unit further comprises at least one second passive element connected to the second protection integrated circuit element. The method according to claim 1,
Wherein at least one of the first protection circuit unit and the second protection circuit unit operates for overcurrent protection to replace the Pitti thermistor. The method according to claim 6,
Wherein the first protection integrated circuit element in the first protection circuit unit controls the at least one first transistor to control overcharge and / or overdischarge of the battery bare cell,
Wherein the two protection integrated circuit elements in the second protection circuit unit control the at least one second transistor to block an overcurrent flowing to the battery bare cell. The method according to claim 1,
Wherein the first protection circuit unit and the second protection circuit unit are composed of the same arrangement of elements. Battery bare cell; And
And a battery protection circuit module connected to the battery bare cell,
The battery protection circuit module includes:
A first terminal and a second terminal electrically connected to the electrode terminal of the battery bare cell;
A third terminal and a fourth terminal electrically connected to the charger or the electronic device;
At least one first transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal, and a first protection integrated circuit for controlling the at least one first transistor, A first protection circuit unit including a circuit element; And
At least one second transistor connected between at least one of the first terminal and the second terminal and at least one of the third terminal and the fourth terminal and in series with the at least one first transistor, And a second protection integrated circuit element for controlling the second protection circuit element.
Battery pack. 10. The method of claim 9,
Wherein at least one of the first protection circuit unit and the second protection circuit unit operates for overcurrent protection to replace the Pitti thermistor.

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