KR102042569B1 - Protection circuit and protection circuit control method - Google Patents

Abstract

The present invention properly operates the protection element in accordance with the output of the remaining battery, even when some of the plurality of batteries are excluded from the current path. A battery module 4 in which a plurality of batteries 3 are connected in parallel and a first protection element provided for each battery 3 and constituting a part of a current path for charging or discharging the battery 3 ( 5) and a second protection element 7 constituting a part of the current path for charging or discharging the battery module 4, wherein the second protection element 7 includes a heat generating resistor and a current for charge or discharge. Comprising a part of the path and provided with a plurality of fuses (20, 21) having a soluble conductor melted by heat or self-heating of the heat generating resistor, the plurality of fuses (20, 21), each of the heat generating resistor By this, each soluble conductor can be melted separately.

Description

PROTECTION CIRCUIT AND PROTECTION CIRCUIT CONTROL METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection circuit which prevents overcurrent or overvoltage of a battery pack and a control method of the protection circuit by using a protection element provided with a heat generating resistor and a fuse element on a substrate.

In recent years, HEVs (hybrid electric vehicles) and electric vehicles (EVs) using batteries and motors are rapidly spreading. As power sources for HEV and EV, lithium ion secondary batteries have been used in terms of energy density and output characteristics. In automotive applications, high voltage and high current are required. As a result, dedicated cells capable of withstanding high voltages and large currents have been developed. However, due to manufacturing costs, in most cases, a plurality of battery cells are connected in series and in parallel to secure a necessary voltage current using a general purpose cell. .

Although lithium ion secondary batteries have excellent characteristics, management of charge / discharge characteristics is indispensable, and if a normal battery cell is treated as usual, a risk such as ignition or explosion may occur. Therefore, when there are a plurality of battery cells, the voltage balance between the cells becomes important, and when an abnormal cell is included, other normal cells are also affected, and there is a problem that correct charging and discharging are not performed.

In order to avoid such a situation, in the battery system using many lithium ion secondary batteries, the fuse element connected on the charge / discharge path | route and the power management system (BMS: Battery Management System) which manages the whole battery are built-in. The BMS manages the charge / discharge status (voltage, capacity, etc.) for each battery cell, and when an abnormality is detected, a signal is supplied to the fuse element from the outside by using a FET switch or the like to cut off the output portion of the circuit, and abnormal heat generation. Avoid troubles such as fire.

Recently, a battery system based on not only the state of charge (SOC) state management (SOC), but also the state of health (SOH) and the state of life (SOL) of the battery system. Management is becoming important.

Japanese Patent No. 4207877

By the way, in the automobile etc. which are moving at a high speed, sudden fall of driving force and sudden stop may be dangerous, and battery management assumed emergency is calculated | required. For example, even when an abnormality of the battery system occurs while driving, it is preferable to avoid the danger to be able to supply the driving force for moving to a repair shop or a safe place, or the driving force for an emergency light or an air conditioner.

However, as shown in FIG. 6, in the battery pack 50 in which a plurality of battery stacks 51 are connected in parallel, when the protection element 52 is provided only on the charge / discharge path, the battery stack 51 When an abnormality occurs in a part of the battery cell 53 configuring the protection element 52 to operate, the charge / discharge path of the entire battery pack 50 is blocked, and thus no more power can be supplied.

Therefore, as shown in FIG. 7, the circuit protection element 54 which cuts off the current path of the whole circuit is provided on the charge / discharge path | route of the whole battery pack 50, and corresponds to one battery stack 51a. A protection circuit has been proposed for providing a stack protection element 55 that cuts off the current path of the battery stack 51a. According to this, when an abnormality occurs in the battery cell 53 of one battery stack 51a, by operating the stack protection element 55, only the battery stack 51 is removed from the charge / discharge path of the battery pack 50. The output is lowered, but the electric power can be continuously supplied by the remaining battery stack 51b.

The circuit protection element 54 constitutes a part of the charge / discharge path of the battery pack 50, and a fuse element that melts by self-heating and cuts off the current path when overcurrent flows is used. The fuse element has a capacity that can sufficiently withstand normal charging and discharging by the entire battery stacks 51a and 51b, and is, for example, 1.5 times overcurrent with respect to the normal output of the entire battery stacks 51a and 51b. Has a capacity to melt.

Here, when an abnormality occurs in the battery cell 53 of one battery stack 51a and the stack protection element 55 is operated to remove the one battery cell 51 from the charge / discharge path of the battery pack 50, The fuse element of the circuit protection element 54 becomes an excess capacity with respect to the output by the other battery stack 51b which remains. Thus, even when an abnormality occurs in the battery cell 53 of the other battery stack 51b, and an overcurrent flows through the fuse element of the circuit protection element 54, it is not melted properly, and thermal runaway can be prevented. There will be no.

It is therefore an object of the present invention to provide a protection circuit capable of appropriately operating the protection element in accordance with the output of the remaining battery even when a part of the plurality of batteries is removed from the current path, and a control method of the protection circuit. The purpose.

MEANS TO SOLVE THE PROBLEM In order to solve the above-mentioned subject, the protection circuit which concerns on this invention is provided in the battery module with which several battery is connected in parallel, and each said battery, and comprises a part of the electric current path | route of charge or discharge of the said battery. A first protection element and a second protection element constituting a part of a current path of charging or discharging of the battery module, wherein the second protection element constitutes a heat generating resistor and a part of a current path of charge or discharge. In addition, a plurality of fuse portions having a soluble conductor melted by heat or self-heating of the heat generating resistor are provided, and the plurality of fuse portions are capable of separately melting each of the soluble conductors by the heat generating resistor. will be.

Moreover, the control method of the protection circuit which concerns on this invention is the battery module in which a some battery is connected in parallel, and is provided in each said battery, and the 1st protection which comprises a part of the current path of the charge or discharge of the said battery. An element, and a second protection element constituting a part of a current path for charging or discharging the battery module, wherein the second protection element includes a heat generating resistor and a current path for charging or discharging according to the number of batteries. And a plurality of fuses having soluble conductors melted by heat or self-heating of the heat generating resistor, and activating the first protection element installed in the battery in which an abnormality occurs. The battery is disconnected from the current path, and in accordance with the disconnection of the battery in which an abnormality occurs, the respective availability is determined by each of the heating resistors. The melting the separately.

According to the present invention, when an abnormality such as an overvoltage is detected in a battery, the stack protection element of the battery is operated to isolate the battery from the circuit, and the battery can be charged and discharged only by the remaining battery. Here, in the present invention, the stack protection element of the battery is operated, the circuit protection element is operated, and some fuse parts are blown off. Accordingly, according to the present invention, even when the maximum output decreases due to the reduction of the battery, the rating of the circuit protection element constituting a part of the charge / discharge path of the battery module can be lowered, and the circuit protection element according to the maximum output of the battery. You can do

1 is a diagram illustrating a configuration of a protection circuit to which the present invention is applied.
FIG. 2A is a cross-sectional view showing the configuration of the stack protection element, and FIG. 2B is a plan view showing the structure of the stack protection element.
3 is a circuit diagram of a stack protection element.
4 is a plan view of the circuit protection element.
5 is a circuit diagram of a circuit protection element.
6 is a diagram illustrating a circuit configuration of a conventional battery pack.
7 is a diagram illustrating a circuit configuration of another conventional battery pack.

EMBODIMENT OF THE INVENTION Hereinafter, the protection circuit to which this invention was applied, and the control method of a protection circuit are demonstrated in detail, referring drawings. In addition, this invention is not limited only to the following embodiment, Of course, various changes are possible in the range which does not deviate from the summary of this invention. In addition, drawing is typical, and ratio of each dimension etc. may differ from an actual thing. Specific dimensions and the like should be determined in consideration of the following description. In addition, of course, the part from which the relationship and the ratio of a mutual dimension differ also in between drawings is contained.

[Protection circuit]

As shown in FIG. 1, the protection circuit 1 to which the present invention is applied has a plurality of battery stacks 3 in which a plurality of battery cells 2 are connected in series, and each battery stack 3 is in parallel with each other. Has a battery module 4 connected to it. Here, for convenience of explanation, the battery module 4 in which two battery stacks 3a and 3b are connected in parallel will be described as an example. However, in the present invention, three or more battery stacks 3 may be connected in parallel. . Each battery stack 3a, 3b has a stack protection element 5 built therein. In addition, the protection circuit 1 controls the charging / discharging in the circuit protection element 7 and the battery stacks 3a and 3b that cut off the current path of the entire circuit, and the abnormal voltage of each battery cell 2. And a BMS control element 8 for driving the stack protection element 5 and the circuit protection element 7 according to the detection result, and the battery stacks 3a and 3b, the circuit protection element 7 and the BMS. The battery pack 9 in which the control element 8 is incorporated constitutes.

[Stack protection element]

The stack protection element 5 comprises a fuse element having a function of interrupting the current path by a signal from the BMS control element 8, in order to safely shut off the output of the battery stack 3a or 3b. The fuse element constituting part of the melt is melted, thereby irreversibly blocking the current path of the battery stack 3a or 3b.

Specifically, as shown in FIGS. 2A and 2B, the stack protection element 5 is laminated on the insulating substrate 11 and the insulating substrate 11, and generates heat generated by the insulating member 15. The resistor 14, the electrodes 12 (A1 and 12 (A2)) formed at both ends of the insulating substrate 11, and the heating element extracting electrode stacked on the insulating member 15 so as to overlap the heating resistor 14. 16 and soluble conductors 13 whose both ends are connected to the electrodes 12 (A1) and 12 (A2), respectively, and the central part thereof are connected to the heating element lead-out electrode 16.

The rectangular insulating substrate 11 is formed of a member having insulation such as alumina, glass ceramics, mullite, zirconia, and the like. In addition, although the material used for printed wiring boards, such as a glass epoxy board | substrate and a phenol board, can also be used, it is necessary to care about the temperature at the time of fuse blow.

The heat generating resistor 14 is a member having a relatively high resistance value and having electrical conductivity that generates heat when energized. Examples of the heat generating resistor 14 include W, Mo, and Ru. The powdery bodies of these alloys, compositions, and compounds are mixed with a resin binder and the like to form a paste on the insulating substrate 11 by pattern forming using a screen printing technique, followed by baking.

The insulating member 15 is disposed to cover the heat generating resistor 14, and the heat generating body lead-out electrode 16 is disposed to face the heat generating resistor 14 via the insulating member 15. In order to transfer the heat of the heat generating resistor 14 to the soluble conductor efficiently, the insulating member 15 may be laminated between the heat generating resistor 14 and the insulating substrate 11.

One end of the heating element lead-out electrode 16 is connected to the heating element electrode 18 (P1). The other end of the heat generating resistor 14 is connected to the other heat generating electrode 18 (P2).

The soluble conductor 13 is made of a low melting point metal which is rapidly melted by the heat generation of the heat generating resistor 14 or the self-heating of the soluble conductor 13, and for example, Pb-free solder containing Sn as a main component can be suitably used. Can be. The soluble conductor 13 may be a laminate of a low melting point metal and a high melting point metal such as Ag, Cu, or an alloy containing these as a main component.

When laminating the stack protection element 5 by laminating a high melting point metal and a low melting point metal, the soluble conductor 13 even if the reflow temperature exceeds the melting temperature of the low melting point metal layer and the low melting point metal is melted. It does not lead to melting as). Such a soluble conductor 13 may be formed by forming a low melting point metal into a high melting point metal using a plating technique, or may be formed by using other well-known lamination techniques and film formation techniques. When the soluble conductor 13 forms an outer layer using a low melting point metal, the soluble conductor 13 is soldered to the heating element lead-out electrode 16 and the electrodes 12 (A1) and 12 (A2) using the low melting point metal. I can connect it.

The stack protection element 5 may also apply flux to almost the entire surface of the soluble conductor 13 in order to prevent oxidation of the low melting point metal layer 13b of the outer layer. In addition, the stack protection element 5 may mount the cover member on the insulating substrate 11 in order to protect the inside.

The stack protection element 5 to which the present invention as described above is applied has a circuit configuration as shown in FIG. 3. That is, the stack protection element 5 melts the soluble conductor 13 by energizing and heating the soluble conductor 13 connected in series via the heating element extraction electrode 16 and the connection point of the soluble conductor 13. It is a circuit structure including the heat generating resistor 14. In the stack protection element 5, the soluble conductor 13 is connected in series on the charge / discharge current path, and the heat generating resistor 14 is connected to the BMS control element 7. One of the two electrodes 12 of the stack protection element 5 is connected to A1, and the other is connected to A2. In addition, the heating element lead-out electrode 16 and the heating element electrode 18 connected to it are connected to P1, and the other heating element electrode 18 is connected to P2.

[Circuit protection element]

Next, the circuit protection element 7 which cuts off the current path of the whole circuit is demonstrated. The circuit protection element 7 comprises a fuse element having a function of interrupting the current path by a signal from the BMS control element 8 in order to safely shut off the output of the battery pack 9, and part of the current path. By fusing the fuse element constituting the above, the current path of the battery pack 9 is irreversibly cut off.

Hereinafter, the circuit protection element 7 used for the battery pack 9 in which two battery stacks 3a and 3b are connected in parallel as shown in FIG. 1 will be described. The stack can be used for all connected battery packs.

Specifically, the circuit protection element 7 has the 1st, 2nd fuse part 20, 21 which can be melted separately, corresponding to the two battery stacks 3a and 3b, as shown in FIG. The first and second fuse parts 20 and 21 are formed on the insulating substrate 22.

The first fuse part 20 is stacked on the insulating substrate 22, the first heat generating resistor 24 covered by the first insulating member 23, and the first electrode 25 formed at both ends of the insulating substrate 22. A1), 25 (A2)), the first heating element lead-out electrode 28 stacked on the first insulating member 23 so as to overlap the first heating resistor 24, and both ends thereof are the first electrodes 25 (A1). ) And 25 (A2), respectively, and a first soluble conductor 29 having a central portion connected to the first heating element lead-out electrode 28.

The second fuse part 21 is stacked on the insulating substrate 22, the second heat generating resistor 31 covered by the second insulating member 30, and the second electrode 32 formed at both ends of the insulating substrate 22. A1), 32 (A2)), the second heating element lead-out electrode 34 stacked on the second insulating member 30 so as to overlap the second heating resistor 31, and both ends of the second electrode 32 (A1). ) And 32 (A2), respectively, and a second soluble conductor 35 having a central portion connected to the second heating element lead-out electrode 34.

Insulating substrate 22, first and second insulating members 23 and 30, first and second heating resistors 24 and 31, first and second heating element lead-out electrodes 28 and 34, and first and second The two soluble conductors 29 and 35 are each of the insulating substrate 11, the insulating member 15, the heat generating resistor 14, the heating element extracting electrode 16, and the soluble conductor 13 of the stack protection element 5 described above. Has the same configuration as

The first electrodes 25 (A1), 25 (A2) and the second electrodes 32 (A1, 32 (A2)) are also similar to the above-described electrodes 12 (A1) and 12 (A2). Has a configuration. In addition, the first electrode 25 (A1) and the second electrode 32 (A1) are electrically connected to each other and are continuous in the current path of the battery pack 9, and the first electrode 25 (A2) and the second electrode. Electrode 32 (A2) is also electrically connected and continues in the current path of battery pack 9.

One end of the first heating element lead-out electrode 28 is connected to the first heating element electrode 27 (P1). In addition, the other end of the first heat generating resistor 24 is connected to the first heat generating electrode 27 (P2). Similarly, one end of the second heating element lead-out electrode 34 is connected to the second heating element electrode 33 (P1). The other end of the second heat generating resistor 31 is connected to the second heat generating electrode 33 (P2).

Also in the circuit protection element 7, flux may be applied to almost the entire surface on the first and second soluble conductors 29 and 35. In addition, the circuit protection element 7 may mount the cover member on the insulating substrate 22 in order to protect the inside.

The circuit protection element 7 to which the present invention as described above is applied has a circuit configuration as shown in FIG. 5. That is, the 1st fuse part 20 of the circuit protection element 7 is the connection point of the 1st soluble conductor 29 and the 1st soluble conductor 29 connected in series via the 1st heat generating body extraction electrode 28. As shown in FIG. It is a circuit structure containing the 1st heat generating resistor 24 which melt | dissolves the 1st soluble conductor 29 by energizing and heating through it. Moreover, the 2nd fuse part 21 of the circuit protection element 7 is the connection point of the 2nd soluble conductor 35 and the 2nd soluble conductor 35 connected in series through the 2nd heat generating body extraction electrode 34. As shown in FIG. It is a circuit structure containing the 2nd heat generating resistor 31 which melts the 2nd soluble conductor 35 by energizing and heating through it.

In the circuit protection element 7, the first and second soluble conductors 29 and 35 are connected in series on the charge / discharge current path of the battery pack 9 and the first and second heat generating resistors 24 and 31. Is connected to the BMS control element 7. The first fuse unit 20 is one of two first electrodes 25 connected to A1, the other connected to A2, and further connected to the first heating element lead-out electrode 28 and this. The first heating element electrode 27 is connected to P1, and the other first heating element electrode 27 is connected to P2. Similarly, one of the two second electrodes 32 of the second fuse part 21 is connected to A1, the other is connected to A2, and the second heating element lead-out electrode 34 and the agent connected thereto. The two heating element electrodes 33 are connected to P1, and the other second heating element electrode 33 is connected to P2.

[BMS control element]

While the BMS control element 8 detects the voltage of each battery cell 2, the soluble conductors 13, 29, 35 of the stack protection element 5 and the circuit protection element 7 according to the detection result. To forgive. The BMS control element 8 is connected to the heat generating resistor 14 of the stack protection element 5 and the first and second heat generating resistors 24 and 31 of the circuit protection element 7. By separately supplying current to 24 and 31, it is possible to generate heat individually. Thereby, the BMS control element 8 can separately melt each of the soluble conductors 13, 29, 35 of the protection elements 5, 7.

In the stack protection element 5 and the circuit protection element 7, the soluble conductors 13, 29, and 35 are blown off by self-heating even by an overcurrent caused by the abnormality of the battery cell 2, thereby blocking the current path. . In addition, the stack protection element 5 and the circuit protection element 7 detect the overcurrent by the BMS control element 8, generate heat to the heat generating resistors 14, 24, 31, and the soluble conductors 13, 29,. 35) may be melted.

Thus, in the stack protection element 5 and the circuit protection element 7, the soluble conductors 13, 29 and 35 are melted by the heat of the heat generating resistors 14, 24 and 31 or by self-heating. The current path can be irreversibly cut off, and there is no influence from abnormal operation of the circuit. Therefore, the function as a protection element can be reliably realized. In addition, like the so-called fuse type protection element, the stack protection element 5 and the circuit protection element 7 can operate not only by overcurrent but also by an abnormal voltage and other factors mentioned later, Can respond to all situations. In addition, the stack protection element 5 and the circuit protection element 7 can reliably maintain the cutoff state without requiring power to maintain the cutoff state of the current path like the protection element of the electric switch system.

[Drive process of protection circuit]

Next, the drive process of the protection circuit 1 is demonstrated. In the protection circuit 1, an overcurrent larger than the rated value occurs in the battery pack 9, and the soluble conductor 13 of the stack protection element 5 and the first and second soluble conductors of the circuit protection element 7 ( When the 29, 35 is energized, the soluble conductors 13, 29, 35 are melted by self-heating (joule heat), and the charge / discharge path of the battery pack 9 is blocked.

In addition, the protection circuit 1 monitors the voltage of the battery cells 2 constituting the battery stacks 3a and 3b by the BMS control element 8, and when overvoltage occurs in some of the battery cells 2, And a heat generating resistor of the stack protection element 5 provided in the battery stack 3 so as to block the battery stack 3 having the battery cell 2 from the current path by the BMS control element 8. For 14), supply current separately and heat separately. Thereby, the BMS control element 8 can separately melt | dissolve the soluble conductor 13 of the said stack protection element 5, and only the battery stack 3 which has the battery cell 2 which the abnormality generate | occur | produced from a circuit is carried out. It can shut off and supply power by the remaining battery stack 3.

For example, as shown in FIG. 1, when an abnormality such as an overvoltage is detected in the battery cell 2 of the battery stack 3a, the BMS control element 8 includes the stack protection element of the battery stack 3a ( By energizing the heat generating resistor 14 of 5), the soluble conductor 13 is melted and the battery stack 3a is isolated from the circuit. As a result, the protection circuit 1 can be charged and discharged only by the remaining battery stack 3b.

Here, the protection circuit 1 operates the stack protection element 5 of the battery stack 3a by the BMS control element 8, operates the circuit protection element 7, and operates the first fuse unit ( Melt 20). As a result, the protection circuit 1 can lower the rating of the circuit protection element 7 constituting a part of the charge / discharge path of the battery pack 9 as the battery stack 3 decreases.

That is, the circuit protection element 7 is provided with the some fuse part according to the number of the battery stack 3, and has a large capacity rating according to the capacity of the battery stack 3 by this. The protection circuit 1 cuts off part of the battery stack 3 from the charge / discharge path of the battery pack 9, and activates some fuses of the circuit protection element 7 to cut off from the charge / discharge path. .

Accordingly, the protection circuit 1 can lower the rating of the circuit protection element 7 as the battery stack 3 decreases, and can make the rating suitable for the capacity of the remaining battery stack 3. Therefore, even when abnormality occurs in the battery cell 2 of the remaining battery stack 3b, and overcurrent flows in the circuit protection element 7, the protection circuit 1 is the same as before the reduction of the battery stack 3a. The second soluble conductor 35 of the second fuse portion 21 remaining in the output can be melted appropriately. That is, the protection circuit 1 can make the operation conditions of the circuit protection element 7 variable according to a power supply output, and can improve safety.

Moreover, one fuse part of the circuit protection element 7 may be provided with respect to one battery stack 3, and one may be provided with respect to the some battery stack 3, and the number of battery stacks 3 may be reduced. The fuse part may be melted to lower the rating. In addition, a plurality of fuse portions of the circuit protection element 7 may be provided for one battery stack 3 so that a plurality of fuse portions may be blown off as one battery stack 3 decreases.

In addition, for the sake of safety, the protection circuit 1 installs a current sensor in the current path to accurately detect the overcurrent to operate the circuit protection element 7 by the BMS control element 8 and to cut off the circuit. It may be. In addition, the 1st, 2nd fuse part 20, 21 may be formed in parallel on one surface of the insulated substrate 22, as shown in FIG. 4, and is formed in the front and back of the insulated substrate 22, respectively. May be

[Drive trigger of BMS control element]

In addition, in the above description, the abnormality voltage of the battery cells 2 in the battery stack 3 is detected to melt the fuse portions of the stack protection element 5 and the circuit protection element 7, thereby removing the battery stack 3. While separating from the current path and lowering the rating of the circuit protection element 7, the battery module 4 is mounted as a trigger for melting the fuses of the stack protection element 5 and the circuit protection element 7. Various settings can be made depending on the device side.

For example, when the battery module 4 is mounted on an EV or HEV or mounted on a power tool, in addition to the abnormality of the battery cell 2, a situation such as an impact caused by an accident, a temperature increase due to water sinking, a fire, etc. In the event of an occurrence, a command is sent to the BMS control element 8 to blow off the fuse portion of the stack protection element 5 and the circuit protection element 7 of each battery stack 3 so as to cut off the current path. In addition, even in the case where a battery cell 2 in which deterioration has progressed in comparison with other battery cells 2 occurs, the stack protection element 5 and the circuit protection element 7 are suppressed in order to suppress the influence of the battery cell 2. The fuse part may be melted to be separated from the current path. In addition, when the battery module 4 is used as a home power source, even when a fire, collapse by a large earthquake, flooding due to a tsunami, or the like occurs, the stack protection device 5 of each battery stack 3 and The fuse of the circuit protection element 7 may be blown to cut off the current path.

1: protection circuit
2: battery cell
3: battery stack
5: stack protection device
7: circuit protection device
8: BMS control element
9: battery pack
11: insulation board
12: electrode
13: soluble conductor
14: heating resistor
15: insulation member
16: heating element lead-out electrode
17: flux
18: heating element electrode
19: cover member
20: first fuse unit
21: second fuse unit
22: insulated substrate
23: first insulating member
24: first heat generating resistor
25: first electrode
27: first heating element electrode
28: first heating element lead-out electrode
29: first soluble conductor
30: second insulating member
31: second heat generating resistor
32: second electrode
33: second heating element electrode
34: second heating element lead-out electrode
35: second soluble conductor

Claims (6)

A battery module in which a plurality of batteries are connected in parallel,
A first protection element installed in each of the batteries and constituting a part of a current path of charging or discharging the battery;
A second protection element constituting a part of a current path of charging or discharging of the battery module,
The second protection element comprises a plurality of fuses having a heat generating resistor and a soluble conductor fused by heat or self-heating of the heat generating resistor according to the number of batteries, and forming a part of a current path of charging or discharging. With wealth,
Operating the first protection element installed in the battery in which the abnormality occurs, disconnecting the battery from the abnormality from the current path,
The said fuse part is a protection circuit which enables each said soluble conductor to be separately melted by each said heat generating resistor according to the interruption | blocking of the said battery in which an abnormality occurred. The protection circuit according to claim 1, further comprising a control element for operating the first protection element and the second protection element. The soluble conductor according to claim 1 or 2, wherein the first protective element constitutes a heat generating resistor and a part of a current path for charging or discharging the battery, and is soluble conductor melted by heat or self-heating of the heat generating resistor. A protective circuit comprising a. The protection circuit according to claim 1 or 2, wherein a detection element for detecting an abnormal voltage of each of said batteries is incorporated. The protection circuit according to claim 1 or 2, wherein each battery constitutes a battery stack in which a plurality of battery cells are connected in series or in parallel. A battery module in which a plurality of batteries are connected in parallel,
A first protection element installed in each of the batteries and constituting a part of a current path of charging or discharging the battery;
A second protection element constituting a part of a current path of charging or discharging of the battery module,
The second protection element comprises a plurality of fuses having a heat generating resistor and a soluble conductor fused by heat or self-heating of the heat generating resistor according to the number of batteries, and forming a part of a current path of charging or discharging. With wealth,
Operating the first protection element installed in the battery in which the abnormality occurs, disconnecting the battery from the abnormality from the current path,
The control method of the protection circuit which melt | dissolves each said soluble conductor individually by each said heat generating resistor according to the interruption | blocking of the said battery which a fault generate | occur | produced.

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