JP7067224B2 - Energization control device, power storage device - Google Patents

Description

The present invention relates to a technique for prohibiting the reuse of a breaking device.

A deteriorated battery may generate heat due to reuse. As shown in FIG. 12, the battery pack described in Patent Document 1 below has a secondary control IC 520 and switches 530 and 540. The secondary control IC 520 has a sensor 522, a fuse control circuit 524, a fuse 526, 527, and a resistor 528, 259. The fuses 526 and 527 are provided at the gate of switches 530 and 540. Resistances 528 and 259 connect the gate and source of switches 530 and 540.

The fuse control circuit 524 passes a blow current through the fuse 526 when there is a failure related to charging. As a result, the fuse 526 is blown, so that the switch 530 is turned off and charging is prohibited. If there is a failure related to discharge, a blow current is passed through the fuse 527. As a result, the fuse 527 is blown, so that the switch 540 is turned off and discharge is prohibited.

JP-A-2015-164388

In order to suppress the power consumption of the drive circuit (fuse control circuit 524), it is preferable that the output current when driving the switches 530 and 540 is small. The output current of the drive circuit (fuse control circuit 524) becomes smaller as the resistance value of the resistors 528 and 259 increases.

In the battery pack described in Patent Document 1, it is considered that the blow current flows from the drive circuit (fuse control circuit 524) to the resistors 528 and 259 through the fuses 526 and 527. Therefore, due to the limitation of the fusing current, the resistance value of the resistors 528 and 259 cannot be increased, so that the current consumption of the drive circuit (fuse control circuit 524) is large.
An object of the present invention is to prohibit the reuse of a power storage element while suppressing the power consumption of the drive circuit.

The energization control device of the power storage element includes a cutoff circuit provided in the power line of the power storage element, a drive circuit for driving the cutoff circuit, and a processing device, and the drive circuit is the drive circuit through the output line. By connecting the output circuit that sends the control signal to the control terminal of the above and the reference terminal and the control terminal of the cutoff circuit, and making the control terminal the same potential as the reference terminal when the output line is opened. A resistor that fixes the cutoff circuit in a cutoff state, a disconnection element that is arranged in the output line of the output circuit and disconnects due to energization, and an energization path that allows a current to flow through the disconnection element by a path different from the resistance. The processing device includes an energization switch provided in the energization path, and when the processing device detects a predetermined condition for the power storage element, the energization switch is turned on and a current is passed through the disconnection element in the energization path. The wire disconnection process for disconnecting the wire disconnection element is performed.

The power storage device includes a power storage element, the energization control device, an accommodating body for accommodating the power storage element and the energization control device, and an external terminal of a positive electrode and an external terminal of a negative electrode provided in the accommodating body.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to prohibit the reuse of the power storage element while suppressing the power consumption of the drive circuit.

It is a side view of a vehicle. It is an exploded perspective view of a battery. It is a top view of the secondary battery shown in FIG. 3A is a cross-sectional view taken along the line AA of FIG. 3A. It is a perspective view which shows the state which accommodated the secondary battery in the main body of FIG. It is a perspective view which shows the state which attached the bus bar to the secondary battery of FIG. It is a figure which shows the circuit structure of a battery. It is a figure which shows the current path of the current which blows a fuse. It is a figure which shows the charger and the battery. It is a figure which shows the comparative example. It is a figure which shows the other circuit composition of a battery. It is a perspective view of a chip bead inductor. It is a figure which shows the conventional structure of a battery pack.

The energization control device of the power storage element includes a cutoff circuit provided in the power line of the power storage element, a drive circuit for driving the cutoff circuit, and a processing device, and the drive circuit is the cutoff circuit through the output line. By connecting the output circuit that sends the control signal to the control terminal of the above and the reference terminal and the control terminal of the cutoff circuit, and making the control terminal the same potential as the reference terminal when the output line is opened. A resistor that fixes the cutoff circuit in a cutoff state, a disconnection element that is arranged in the output line of the output circuit and disconnects due to energization, and an energization path that allows a current to flow through the disconnection element by a path different from the resistance. The processing device includes an energization switch provided in the energization path, and when the processing device detects a predetermined condition for the power storage element, the energization switch is turned on and a current is passed through the disconnection element in the energization path. The wire disconnection process for disconnecting the wire disconnection element is performed.

When the processing device detects a predetermined condition for the power storage element, the processing device turns on the energization switch. When the energization switch is turned on, a current flows through the disconnection element. As a result, the disconnection element is disconnected and the output line is opened.

When the output line is opened, the reference terminal and the control terminal of the cutoff circuit are held at the same potential by the resistance, so that the cutoff circuit is fixed to the cutoff state. As a result, the reuse of the power storage element is prohibited.

The energization path for passing a current through the disconnection element is a path different from the resistance connecting the two terminals of the cutoff circuit. Since the resistance connecting the two terminals is not included in the energization path through which the current flows through the disconnection element, the resistance value can be set arbitrarily. If the resistance value can be increased, the output current of the output circuit can be reduced, so that the power consumption of the drive circuit can be suppressed.

The cutoff circuit includes a first semiconductor switch that controls charging of the power storage element and a second semiconductor switch that controls discharge of the power storage element, and is used for the first semiconductor switch and the second semiconductor switch. The processing device includes two drive circuits, and when a predetermined condition is detected for the power storage element, the processing device relates to a first drive circuit for the first semiconductor switch and a second drive circuit for the second semiconductor switch. , The disconnection process may be performed.

The processing device can control the charging and discharging of the power storage element by individually controlling the first semiconductor switch and the second semiconductor switch. When a predetermined condition is detected for the power storage element, the processing device performs disconnection processing between the first drive circuit and the second drive circuit. Since the first semiconductor switch and the second semiconductor switch are fixed in the cutoff state by the disconnection process, the power storage element cannot be charged or discharged, and reuse is prohibited.

The disconnection element may be a chip bead inductor. The output line can be opened by passing a current exceeding the rating through the chip bead inductor to break the wire.

The power storage device includes a power storage element, an energization control device, an accommodating body accommodating the power storage element and the energization control device, and an external terminal provided in the accommodating body.

The cutoff circuit may be provided in a power line connecting the external terminal of the negative electrode and the negative electrode of the power storage element. When a cutoff circuit is provided in the power line between the external terminal of the negative electrode and the negative electrode of the power storage element, a charger having a higher charging voltage than the power storage element can be connected between the control terminal of the cutoff circuit and the reference terminal. The break circuit may malfunction due to the voltage difference. By applying this technique, it is possible to suppress malfunction of the break circuit.

<Embodiment>
1. 1. Structural Explanation of Battery BT1 FIG. 1 is a side view of a vehicle VH, and FIG. 2 is an exploded perspective view of the battery BT1. The vehicle VH is an engine-driven vehicle. The vehicle VH includes a battery BT1 which is a power storage device. As shown in FIG. 2, the battery BT1 includes an accommodating body 1, an assembled battery 40 accommodated therein, and a circuit board unit 31.

The housing 1 includes a main body 3 and a lid 4 made of a synthetic resin material. The main body 3 has a bottomed tubular shape, and includes a bottom surface portion 5 having a rectangular shape in a plan view and four side surface portions 6 rising from the four sides thereof to form a tubular shape. An upper opening 7 is formed at the upper end portion by the four side surface portions 6.

The lid 4 has a rectangular shape in a plan view, and the frame 8 extends downward from the four sides thereof. The lid 4 closes the upper opening 7 of the main body 3. The upper surface of the lid 4 has a protrusion 9 having a substantially T-shape in a plan view. On the upper surface of the lid 4, the external terminal 10 of the positive electrode is fixed to one corner of the two locations having no protruding portion 9, and the external terminal 11 of the negative electrode is fixed to the other corner. .. The housing 1 houses the secondary battery 2 and the circuit board unit 31. The circuit board unit 31 is arranged above the secondary battery 2.

As shown in FIGS. 3A and 3B, the secondary battery 2 has an electrode body 13 housed in a rectangular parallelepiped case 12 together with a non-aqueous electrolyte. The case 12 has a case body 14 and a cover 15 that closes an opening above the case body 14.

Although not shown in detail, the electrode body 13 is porous between the negative electrode element in which the active material is applied to the base material made of copper foil and the positive electrode element in which the active material is applied to the base material made of aluminum foil. A separator made of a resin film is arranged. All of these are band-shaped, and the negative electrode element and the positive electrode element are wound flat so as to be accommodated in the case body 14 with the positions of the negative electrode element and the positive electrode element shifted to the opposite sides in the width direction with respect to the separator. ..

The positive electrode terminal 17 is connected to the positive electrode element via the positive electrode current collector 16, and the negative electrode terminal 19 is connected to the negative electrode element via the negative electrode current collector 18. The positive electrode current collector 16 and the negative electrode current collector 18 include a flat plate-shaped pedestal portion 20 and leg portions 21 extending from the pedestal portion 20. A through hole is formed in the pedestal portion 20. The leg 21 is connected to a positive electrode element or a negative electrode element. The positive electrode terminal 17 and the negative electrode terminal 19 are composed of a terminal main body portion 22 and a shaft portion 23 protruding downward from the center portion of the lower surface thereof. Among them, the terminal body portion 22 and the shaft portion 23 of the positive electrode terminal 17 are integrally molded of aluminum (single material). In the negative electrode terminal 19, the terminal main body 22 is made of aluminum and the shaft 23 is made of copper, and these are assembled. The terminal body 22 of the positive electrode terminal 17 and the negative electrode terminal 19 is arranged at both ends of the cover 15 via a gasket 24 made of an insulating material, and is exposed to the outside from the gasket 24.

As shown in FIG. 4, a plurality of (for example, 12) secondary batteries 2 having the above configuration are housed in the main body 3 in a state of being arranged side by side in the width direction. Three secondary batteries 2 are set as one set from one end side to the other end side (arrow Y1 to Y2 direction) of the main body 3, and the terminal polarities of adjacent secondary batteries 2 and 2 are the same in the same set, and they are adjacent to each other. The terminal polarities of the adjacent secondary batteries 2 are arranged in reverse in the matching sets. In the three secondary batteries 2 (first set) located closest to the arrow Y1, the arrow X1 side is the negative electrode and the arrow X2 side is the positive electrode. In the three secondary batteries 2 (second set) adjacent to the first set, the arrow X1 side is the positive electrode and the arrow X2 side is the negative electrode. The third group adjacent to the second group has the same arrangement as the first group, and the fourth group adjacent to the third group has the same arrangement as the second group.

As shown in FIG. 5, terminal bus bars 26 to 30 as conductive members are connected to the positive electrode terminal 17 and the negative electrode terminal 19 by welding. On the arrow X2 side of the first set, the positive electrode terminal 17 group is connected by the first bus bar 26. Between the first set and the second set, the negative electrode terminal 19 group of the first set and the positive electrode terminal 17 group of the second set are connected by the second bus bar 27 on the arrow X1 side. Between the second set and the third set, the negative electrode terminal 19 group of the second set and the positive electrode terminal 17 group of the third set are connected by the third bus bar 28 on the arrow X2 side. Between the 3rd group and the 4th group, the negative electrode terminal 19 group of the 3rd group and the positive electrode terminal 17 group of the 4th group are connected by the 4th bus bar 29 on the arrow X1 side. On the arrow X2 side of the fourth set, the negative electrode terminal 19 group is connected by the fifth bus bar 30.

The secondary batteries 2 are in parallel in the same set and in series in different sets. Therefore, the 12 secondary batteries 2 are in 3 parallels and 4 series. The secondary battery 2 is, for example, a lithium ion secondary battery.

The first bus bar 26 connecting the positive electrode terminal group of the first set is connected to the external terminal 10 of the positive electrode, and the fifth bus bar 30 connecting the negative electrode terminal group of the fourth set is connected to the external terminal 11 of the negative electrode. Has been done.

2. 2. Explanation of Electrical Configuration of Battery BT1 FIG. 6 is a block diagram showing an electrical configuration of battery BT1. The battery BT1 includes an assembled battery 40, a current sensor 44, a cutoff circuit 45, a voltage measuring unit 48, and a management device 50. The management device is an example of a processing device.

The assembled battery 40 includes four sets of secondary batteries 2 connected in series. The current sensor 44, the assembled battery 40, and the cutoff circuit 45 are connected in series via the power lines 43P and 43N. The power line 43P on the positive electrode side is a power line that connects the external terminal 10 of the positive electrode and the positive electrode of the assembled battery 40. The power line 43N on the negative electrode side is a power line that connects the external terminal 11 of the negative electrode and the negative electrode of the assembled battery 40. The current sensor 44 is located on the positive electrode side of the assembled battery 40, and the cutoff circuit 45 is located on the negative electrode side of the assembled battery 40. The current sensor 44 is provided on the power line 43P on the positive electrode side, and the cutoff circuit 45 is provided on the power line 43N on the negative electrode side.

The current sensor 44 is arranged on the circuit board unit 31. The current sensor 44 measures the current I of the assembled battery 40. The current sensor 44 is connected to the management device 50 via a signal line, and the measured value of the current sensor 44 is input to the management device 50.

The voltage measuring unit 48 measures the voltages V1 to V4 of each secondary battery 2 and the total voltage Vt of the assembled battery 40. The voltage measuring unit 48 outputs the measured data of the measured voltages V1 to V4 and Vt to the management device 50.

Vt = V1 + V2 + V3 + V4 ... (1)

The management device 50 is arranged on the circuit board unit 31. The management device 50 includes a CPU (central processing unit) 51, a memory 53, and a communication unit 55. The management device 50 monitors the state of the assembled battery 40. It monitors whether the total voltage Vt of the assembled battery 40 and the battery voltages V1 to V4 of each secondary battery 2 are within the usage range. The management device 50 monitors whether or not the current I of the assembled battery 40 is within the limit value based on the measured value measured by the current sensor 44.

In the memory 53, each data for the management device 50 to execute the state monitoring and the protection process of the assembled battery 40 is stored. The communication unit 55 is provided for communication with the vehicle ECU (not shown) mounted on the vehicle 1.

The cutoff circuit 45 is arranged on the circuit board unit 31. The cutoff device 45 includes a first FET 45A and a second FET 45B. The first FET 45A and the second FET 45B are N-channel field effect transistors and are back-to-back connected. The first FET 45A and the second FET 45B are turned on when Vgs (gate-source voltage) is higher than a positive predetermined voltage (threshold voltage). Further, the first FET 45A and the second FET 45B are turned off when Vgs (gate-source voltage) is smaller than a positive predetermined voltage.

The first FET 45A connects the source S to the external terminal 11 of the negative electrode, and the second FET 45B connects the source S to the negative electrode of the assembled battery 40. The drain D of the first FET 45A and the drain D of the second FET 45B are connected.

The first FET 45A has a parasitic diode 46A, and the second FET 45B has a parasitic diode 46B. The parasitic diode 46A has the same forward direction as the discharge direction. The parasitic diode 46B has the same forward direction as the charging direction. The source S of the first FET 45A is a reference terminal, and the gate G is a control terminal.

When both the first FET 45A and the second FET 45B are on, the assembled battery 40 can be charged and discharged. When the first FET 45A is on and the second FET 45B is off, the assembled battery 40 can only be charged and cannot be discharged . The first FET 45A is a first semiconductor switch that controls charging of the assembled battery 40.

When the first FET 45A is off and the second FET 45B is on, the assembled battery 40 can only be discharged and cannot be charged . The second FET 45B is a second semiconductor switch that controls the discharge of the assembled battery 40.

When both the first FET 45A and the second FET 45B are off, the assembled battery 40 is shut off, and both charging and discharging are prohibited.

The battery BT1 has a drive circuit 60A for driving the first FET 45A. The drive circuit 60A includes a first output circuit 61A, a first resistor 67A, a first fuse 71A, a series resistance 73A, a first current path 74A, and a first energization switch 75A.

The first output circuit 61A includes a third FET 62A, a fourth FET 63A, and a third resistor 65A. The third FET 62A is a P-channel electric field effect transistor, and the fourth FET 63A is an N channel electric field effect transistor.

The third FET 62A connects the source S to the internal power supply Vcc, and the fourth FET 63A connects the source S to the reference potential. The drain of the third FET 62A and the drain D of the fourth FET 63A are connected by the third resistance 65A. The internal power supply Vcc is a power supply for the internal circuit of the battery BT1 such as the management device 50 and the drive circuit 60A. The internal power supply Vcc is powered by the assembled battery 40.

The drain D of the fourth FET 63A is connected to the gate G of the first FET 45A via the first output line Lo1. The gate G of the third FET 62A and the fourth FET 63A is connected to the management device 50 via the control lines Lc1 and Lc2. When a control signal is given from the management device 50 to turn on the third FET 62A and turn off the fourth FET 63A, the voltage Vgs between the gate and the source of the first FET 45A becomes a positive predetermined voltage. As a result, the first FET 45A is turned on.

The first resistance 67A is connected between the source S of the first FET 45A and the gate G. The first resistance 67A functions to hold the gate G of the first FET 45A at the same potential as the source S of the first FET 45A when the output line Lo1 is opened.

The first fuse 71A and the series resistance 73A are provided in the output line Lo1 of the first output circuit 61A. The first fuse 71A and the series resistance 73A are connected in series. The first fuse 71A is connected to the drain D of the fourth FET 63A, and the series resistance 73A is connected to the gate G of the first FET 45A. The first fuse 71A is blown by a fusing current If of a predetermined value or more.

The first current path 74A is a path that connects the external terminal 11 of the negative electrode, the first fuse 71A, and the intermediate connection point P of the series resistance 73A, and does not include the first resistance 67A. The first energization switch 75A is an NPN transistor. The first energization switch 75A is arranged in the first current path 74A. The collector of the first energization switch 75A is connected to the source S of the first FET 45A. The emitter of the first energization switch 75A is connected to the intermediate connection point P between the first fuse 71A and the series resistance 73A.

The base of the first energization switch 75A is connected to the management device 50 via the control line Lc3. The first energization switch 75A can be controlled by giving a control signal from the management device 50.

When the first energization switch 75A is on and the fourth FET 63A is on, a fusing current If flows from the external terminal 11 of the negative electrode to the first fuse 71A through the first current path 74A, as shown in FIG. The fusing current If flowing through the first fuse 71A flows through the fourth FET 63A to the internal GND of the battery BT1.

The fusing current If of the first fuse 71A is larger than the output current of the first output circuit 61A when driving the first FET 45A. Therefore, when the first FET 45A is driven, the first fuse 71A does not blow.

The battery BT1 has a drive circuit 60B for driving the second FET 45B. The drive circuit 60B includes a second output circuit 61B, a second resistor 67B, a second fuse 71B, a series resistance 73A, and a second energization switch 75B. The configuration and operation of the drive circuit 60B for the second switch 45B are the same as those of the drive circuit 60A for the first FET 45A. The drive circuit 60A is the first drive circuit, and the drive circuit 60B is the second drive circuit.

The vehicle load 110 and the alternator 120 mounted on the vehicle VH are connected to the external terminals 10 and 11 of the battery BT1. While the engine is being driven, if the amount of power generated by the alternator 120 is greater than the power consumption of the vehicle load 110, the battery BT1 is charged by the alternator 120.

When the amount of power generated by the alternator 120 is smaller than the power consumption of the vehicle load 110, the battery BT1 discharges to make up for the shortage. While the engine is stopped, the alternator 120 stops power generation. Therefore, the battery BT1 is in a state in which the power supply is stopped (a state in which the battery is not charged), and only the discharge is performed with respect to the vehicle load 110. The vehicle load 110 is a starter motor for starting an engine, auxiliary machinery for driving the engine, a vehicle ECU, and the like.

3. 3. Protection processing of the assembled battery and prohibition of reuse The CPU 52 of the management device 50 has the current I of the assembled battery 44, the total voltage Vt, and the voltage V1 of each secondary battery 2 based on the outputs of the current sensor 44 and the voltage measuring circuit 48. ~ Monitor V4.

If the CPU 52 does not detect any of the following conditions (A) to (C) (an example of a predetermined condition), the CPU 52 determines that the assembled battery 40 is normally used.

(A) When the current I of the assembled battery 44 exceeds the limit value (B) When the total voltage Vt of the assembled battery 44 exceeds the upper limit voltage (overcharge)
(C) When the total voltage Vt of the assembled battery 44 drops below the lower limit voltage (overdischarge)

When the assembled battery 44 is normally used, the CPU 52 controls the third FET 62A of the first output circuit 61A to be on and the fourth FET 63A to be turned off. The CPU 52 controls the third FET 62B of the second output circuit 61B to be on, and controls the fourth FET 63B to be off.

When the third FET 62A is on and the fourth FET 63A is off, the first switch 45A is on. When the third FET 62B is on and the fourth FET 63B is off, the second switch 45B is on. Therefore, the assembled battery 40 can be both charged and discharged.

The CPU 52 controls the first energization switch 75A and the second energization switch 75B to be turned off when the assembled battery 44 is normally used.

When the CPU 52 detects any of the conditions (A) to (C), the CPU 52 executes the protection process of the assembled battery 40.

The CPU 52 switches the first energization switch 75A from off to on, switches the third FET 62A from on to off, and switches the fourth FET 63A from off to on. The CPU 52 switches the second energization switch 75B from off to on, switches the third FET 62B from on to off, and switches the fourth FET 63B from off to on.

By switching the switch, as shown in FIG. 7, a fusing current If flows from the external terminal 11 of the negative electrode to the first fuse 71A through the first current path 74A. As a result, the first fuse 71A is blown and disconnected (disconnection treatment). A fusing current If flows from the external terminal 11 of the negative electrode through the second current path 74B to the second fuse 71B. As a result, the second fuse 71B is blown and disconnected (disconnection treatment).

When the first fuse 71A is blown, the first output line Lo1 of the first output circuit 61A is opened as shown in FIG. When the first output line Lo1 is opened, the gate G of the first FET 45A is held at the same potential as the source S by the first resistance 67A. Therefore, the first FET 45A is fixed to off.

When the second fuse 71B is blown, the second output line Lo2 of the second output circuit 61B is opened. When the second output line Lo2 is opened, the gate G of the second FET 45B is held at the same potential as the source S by the second resistance 67B. Therefore, the second FET 45A is fixed to off.

By fixing the first FET 45A and the second FET 45B to off, the assembled battery 40 is cut off, and charging and discharging cannot be performed.

By opening the first output line Lo1 and the second output line Lo2 and disconnecting the gate G of the first FET 45A and the second FET 45B from the first output circuit 61A and the second output circuit 61B, respectively, the output circuits 61A and 61B fail. It is possible to prevent the first FET 45A and the second FET 45B from malfunctioning and turning on due to an electrical error such as noise from the outside.

In particular, by opening the first output line Lo1, the battery BT1 is tried to be reused after the protection operation is executed, and as shown in FIG. 8, the charging voltage is higher than that of the assembled battery 40 between the external terminals 10 and 11. When the charger 150 is connected, it is possible to prevent the first FET 45A from malfunctioning and turning on. Therefore, it is possible to prevent the battery BT1 that has been protected from being reused.

The reason why the first FET 45A may malfunction is as follows. In the case of the battery BT3 shown in FIG. 9, the voltage of the negative electrode external terminal 11 is lower than the voltage of the negative electrode (battery internal GND) of the negative electrode by connecting the charger 150 having a charging voltage higher than that of the assembled battery 40. As a result, the voltage Vgs between the gate and the source of the first FET 45A becomes a positive voltage.

Since the first resistance 67A and the second resistance 67B are not included in the first energization path 74A and the second current path 74B in which the current flows through the first fuse 71A and the second fuse 71B, the resistance value can be arbitrarily set. If the resistance values of the first resistance 67A and the second resistance 67B can be increased, the gate voltage for driving the first FET 45A and the second FET 45B can be generated with a small current. Therefore, since the output currents of the output circuits 61A and 61B can be reduced, the power consumption of the drive circuits 60A and 60B can be suppressed.

<Other embodiments>
The present invention is not limited to the embodiments described above and the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the secondary battery 2 is exemplified as the power storage element. The power storage element is not limited to the secondary battery 2, and may be a capacitor or the like. The usage of the battery BT1 is not limited to that of a vehicle, and may be used for other purposes such as an uninterruptible power supply system and a power storage device of a photovoltaic power generation system.

(2) In the above embodiment, the cutoff circuit 45 includes a first FET 45A for charge control and a second FET 45B for discharge control. The cutoff circuit 45 may be one semiconductor switch having both charge control and discharge control, for example, a power transistor. In this case, only one drive circuit 60 is required.

(3) In the above embodiment, the cutoff circuit 45 is arranged on the power line 43N on the negative electrode side. The cutoff 45 may be arranged on the power line 43P on the positive electrode side.

(4) In the above embodiment, the first current path 74A and the second current path 74B are paths connecting the external terminal 11 of the negative electrode and the intermediate connection point P. The current path through which the current flows through the first fuse 71A and the second fuse 71B may be any path that does not include the first resistors 67A and 67B. Like the battery BT2 shown in FIG. 10, the first current path 174A and the second current path 174B may be a path connecting the internal power supply Vcc and the intermediate connection point P.

(5) In the above embodiment, when the management device 50 detects any of the conditions (A) to (C), it blows the fuses 71A and 71B arranged in the output lines Lo1 and Lo2 of the output circuits 61A and 61B. bottom. The conditions for blowing the fuses 71A and 71B are not limited to the conditions related to the current and voltage of the assembled battery 40, and the temperature conditions of the assembled battery 40 may be added, such as when the upper limit temperature is exceeded. As the condition for blowing the fuses 71A and 71B, only one of the conditions related to current, the condition related to voltage, and the condition related to temperature may be used.

(6) In the above embodiment, the first fuse 71A and the second fuse 71B are exemplified as the disconnection element. The disconnection element may be any element that disconnects when a current of a predetermined value or more flows, and may be a chip bead inductor. As shown in FIG. 11, the chip bead inductor 200 has a main body 210 and external electrodes 221 and 222. The main body 210 is made of ferrite and has a spiral inner conductor 215. The external electrodes 221 and 222 are located on both sides of the main body 210, and both ends of the internal conductor 215 are connected to each other. The main body 210 can be formed by alternately stacking a sheet-shaped ferrite layer and an inner conductor 215. In the chip bead inductor 200, when a current flows through the internal conductor 215, a magnetic flux is generated in the ferrite and acts as an inductor. When a current exceeding the rating flows in the chip bead inductor 200, the internal conductor 215 is fused. Therefore, the chip bead inductor 200 can be substituted for the fuses 71A and 71B.

(7) In the above embodiment, a series resistor 73A is provided on the first output line Lo1 of the first output circuit 61A. The series resistance 73A may be omitted. The same applies to the series resistance 73B.

(8) In the first embodiment, an example in which the cutoff circuit 45, the management device 50, and the drive circuits 60A and 60B are provided inside the battery BT1 is shown. The cutoff circuit 45 may be arranged on the power line of the assembled battery 40, or may be arranged on a power line outside the battery connecting the battery BT1 and the vehicle load. The management device 50 and the drive circuits 60A and 60B may also be provided outside the battery BT1.

2 ... Secondary battery (power storage element)
40 ... Battery 44 ... Current sensor 45 ... Break circuit 45A, 45B ... 1st FET, 2nd FET (1st semiconductor switch, 2nd semiconductor switch)
50 ... Management device (processing device)
51 ... CPU
60A, 60B ... Drive circuit (1st drive circuit, 2nd drive circuit)
61A, 61B ... Output circuit 67A, 67B ... 1st resistance, 2nd resistance 71A, 71B ... 1st fuse, 2nd fuse (disconnection element)
74A, 74B ... 1st current path, 2nd current path 75A, 75B ... 1st energization switch, 2nd energization switch BT1 ... Battery (power storage device)
VH ... vehicle

Claims (6)

It is an energization control device for power storage elements.
The cutoff circuit provided in the power line of the power storage element and
The drive circuit that drives the cutoff circuit and
Equipped with a processing device,
The drive circuit
An output circuit that sends a control signal to the control terminal of the cutoff circuit through the output line,
A first that fixes the cutoff circuit to the cutoff state by connecting between the reference terminal and the control terminal of the cutoff circuit and setting the control terminal to the same potential as the reference terminal when the output line is opened. Resistance and
A disconnection element arranged in the output line of the output circuit and disconnecting by energization, and a disconnection element.
An energization path for passing a current through the disconnection element in a path different from that of the first resistance,
The energization switch provided on the high side where the voltage is high when viewed from the disconnection element in the energization path is provided.
The output circuit is
FET that connects the source to the internal power supply,
FET that connects the source to the reference potential,
Includes a second resistor connecting the drains of the two FETs.
The output line is connected to the drain of the FET that connects the source to the reference potential.
The energization path for passing a current through the disconnection element is
It is a path leading to the reference potential via the FET that connects the energization switch, the disconnection element, and the source to the reference potential.
When the processing device detects a predetermined condition for the power storage element, the processing device turns on the FET that connects the energization switch and the source to the reference potential and causes a current to flow through the disconnection element in the energization path to cause the disconnection. An energization control device that performs wire break processing to break the element. The energization control device according to claim 1.
The break circuit
A first semiconductor switch that controls the charging of the power storage element and a second semiconductor switch that controls the discharge of the power storage element are provided.
The drive circuit is provided with two circuits, one for the first semiconductor switch and the other for the second semiconductor switch.
When the processing device detects a predetermined condition for the power storage element, the processing device
An energization control device that performs the disconnection processing of the first drive circuit for the first semiconductor switch and the second drive circuit for the second semiconductor switch. The energization control device according to claim 1 or 2.
The disconnection element is an energization control device which is a chip bead inductor. It ’s a power storage device,
With a power storage element
The energization control device according to any one of claims 1 to 3, and the energization control device.
An accommodating body accommodating the power storage element and the energization control device,
A power storage device including an external terminal of a positive electrode and an external terminal of a negative electrode provided in the housing. The power storage device according to claim 4.
The cutoff circuit is a power storage device provided in a power line connecting the external terminal of the negative electrode and the negative electrode of the power storage element. The power storage device according to claim 4 or 5.
The energization switch is
A power storage device connected to the external terminal of the negative electrode or an internal power source.

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