CN116457979A

CN116457979A - Method and system for protecting battery

Info

Publication number: CN116457979A
Application number: CN202280007204.0A
Authority: CN
Inventors: 金宰亨
Original assignee: LG Energy Solution Ltd
Current assignee: LG Energy Solution Ltd
Priority date: 2021-09-30
Filing date: 2022-08-26
Publication date: 2023-07-18

Abstract

The present invention relates to a method and system for protecting a battery while maintaining existing protection operating/release conditions by: classifying the protection operations based on the possibility of occurrence of safety problems such as fire/heat generation, and additionally implementing protection algorithms corresponding to the protection operations, respectively; and taking a preliminary action of preventing overcharge of the specific battery pack by checking occurrence of overvoltage in the specific battery pack before the battery unbalance protection operation condition is reached, if the overvoltage of the battery pack continues to occur even after the initial action is taken, permanently preventing the battery operation to prevent a safety problem in advance.

Description

Method and system for protecting battery

Technical Field

The present invention relates to a battery protection method and system, and more particularly, to a method and system for protecting a battery by preventing simple battery operation malfunction and safety problems in advance by implementing an additional algorithm for releasing a protection operation (reuse of the battery) after generation of the battery protection operation.

Background

Batteries are widely used in various fields from small electronic devices such as smart phones, notebook computers, and tablet computers to electric vehicles and Energy Storage Systems (ESS).

However, although such a battery has efficiency and convenience that can be used in various fields, it has a risk of catching fire when overheated due to the characteristic of high energy density. In particular, since the battery market itself is increasingly anxious with the rapid increase of battery firing accidents, ensuring the improvement of safety of the battery is considered as an important task.

As a technique for ensuring the safety of the battery, a battery protection circuit that protects the battery from overcharge, overdischarge, overcurrent, and short circuit is used. In general, when abnormal charge/discharge, short circuit, or overheat outside a set value is detected, a battery protection circuit generates a corresponding protection operation to take an abnormal measure, and then releases the protection operation to achieve normal operation of the battery when the battery state satisfies a preset release condition.

On the other hand, the battery condition is actually normal, but there is often a case where the protection operation is activated or the set value is changed, which is received as a malfunction, due to abnormal noise generated when the battery communicates with an external system or is combined with the system.

However, in a state in which a conventional protection operation such as overcharge, overdischarge, short circuit, overheat is detected, when a preset release condition is satisfied, it is difficult for the method of canceling the protection operation to switch the battery to the normal mode to protect the battery from simple battery operation failure. These prior art techniques are given in the following patent documents.

(patent document 1) JP 2010-259125A

(patent document 2) KR 10-2021-0033295A

Disclosure of Invention

Technical problem

An object of the present invention is to solve the above problems, and to provide a method and system for ensuring battery safety by supplementing reuse conditions for simple battery operation failure and enhancing protection operation for safety problems.

It is another object of the present invention to provide a method and system capable of ensuring battery safety by preventing excessive use of a specific battery pack due to voltage unbalance between battery packs.

Technical proposal

The battery protection method according to an embodiment of the present invention includes: a state data measurement step of measuring state data of the battery at regular intervals; a protection operation generating step of determining whether the state of the battery satisfies a preset protection operation generating condition for each protection operation item of each battery using the state data of the battery measured in the state data measuring step, and generating a battery protection operation for the item determined to be satisfied; a protection operation releasing step of determining whether a protection operation releasing condition of a preset occurrence item is satisfied by using the measured state data of the battery after at least one item of battery protection operation has occurred through the protection operation generating step, and releasing the generated protection operation when the protection operation is satisfied, so that the battery is operated in a normal operation mode; and an abnormal measure step of dividing the category to which the item of the protection operation that occurs in the protection operation generation step belongs, and taking a predetermined abnormal measure corresponding to the corresponding category when it is determined that the abnormal measure corresponding to the divided category is satisfied by determining whether the occurrence state of the protection operation satisfies the condition.

In more detail, the abnormal measure step includes: a category classification step of classifying which category of the first category and the second category the item of the protection operation generated in the protection operation generation step belongs to; an abnormal measure satisfaction determining step of determining whether an occurrence state of the occurrence of the protection operation satisfies an abnormal measure satisfaction condition corresponding to the classified category after classifying the category to which the item of the protection operation occurring in the category classifying step belongs; and an abnormal measure operation step of taking a predetermined abnormal measure corresponding to the corresponding category when it is determined that the abnormal measure is satisfied.

Furthermore, the abnormal measure satisfaction determining step includes: when the item in which the protection operation occurs is of the first category, performing a number comparison step of comparing whether the number of occurrences of the protection operation of the corresponding item up to the current period is equal to or greater than a first reference number, and determining that a condition satisfying an abnormal measure corresponding to the first category is satisfied if the number of occurrences is greater than or equal to the first reference number; and if the above item in which the protection operation has occurred belongs to the second category, performing a number of occurrences comparing step of comparing whether the number of occurrences of the protection operation of the item up to the current period is equal to or greater than the first reference number of times, and performing a generation continuation checking step of checking whether the generation state of the corresponding protection operation continues to exceed the reference time, and determining that a condition satisfying the abnormal measure corresponding to the second category is satisfied when the number of occurrences is greater than or equal to the first reference number of times and the corresponding protection operation generation state is a state that continues to exceed the reference time.

In addition, the abnormal measure operation steps include: a notification alarm providing step of providing a battery state confirmation notification alarm when it is determined that an item of the protection operation that has occurred satisfies a condition of satisfying an abnormal measure corresponding to the first category; initializing a control value of the battery control value currently set in the memory to an initial battery control value; and performing a control value initializing step of initializing a battery control value currently set in the memory to an initial battery control value when it is determined that the item of the protection operation that has occurred satisfies a condition satisfying the abnormal measure corresponding to the second category.

Further, the battery protection method according to an embodiment of the present invention further includes: after the notification alarm providing step and the control value initializing step in the abnormal measure operating step are performed, if the protection operation of the same item occurs more than the second reference number of times, the additional abnormal measure operation of the battery is permanently prevented.

Further, the first category is a category to which an item that is likely to be expressed as a protection operation including a safety problem of heat generation and ignition belongs, wherein the second category is a category to which an item that is unlikely to be expressed as a protection operation including a safety problem of heat generation and ignition belongs.

The battery protection method according to another embodiment of the present invention includes: a state data measuring step of measuring state data of a battery including at least two battery packs at regular intervals; a battery protection operation generation step of comparing whether or not the voltage of each battery pack being charged satisfies a preset overvoltage protection operation generation condition based on the state data of the battery measured in the state data measurement step to generate an overvoltage protection operation for the battery pack satisfying the requirement; a group voltage difference calculation step of calculating a voltage difference between the overvoltage protection operation generating battery in the battery protection operation generating step and the battery having the lowest voltage compared to the overvoltage protection operation generating battery; a notification alarm generation step of comparing whether the voltage difference calculated in the group voltage difference calculation step is included in a predetermined reference voltage difference range, and generating a state confirmation notification alarm for the overvoltage protection operation generation of the battery group when included; and a buffer voltage drop adjusting step of checking whether or not the overvoltage protection operation continues to occur more than the first reference number of times in the same battery pack after the occurrence of the state confirmation notice alarm of the notice alarm generating step, and in the event of occurrence, adjusting down a buffer voltage value currently set for the battery pack by a predetermined reference voltage value or a predetermined ratio (%) of the buffer voltage value currently set.

In addition, the battery protection method further includes: after the buffer voltage drop adjustment by the buffer voltage drop adjustment step, checking whether the overvoltage protection operation continues to occur more than a second reference number of times in the same battery pack, and a battery operation permanent shutdown step of permanently preventing the operation of the battery if it occurs.

Here, the predetermined reference voltage difference range is equal to or greater than the first reference voltage difference but less than the second reference voltage difference.

In detail, the first reference voltage difference is a value corresponding to 80% of the second reference voltage difference, wherein the second reference voltage difference is a value corresponding to a battery unbalance protection operation occurrence determination standard.

The battery protection system according to an embodiment of the present invention includes: a state data measurement unit configured to measure state data of the battery at regular intervals; a battery protection operation generation unit configured to determine whether or not a battery state satisfies a preset protection operation generation condition for each protection operation item using the state data of the battery measured by the state data measurement unit; a battery protection operation release unit configured to: after the protection operation of at least one item is generated by the battery protection operation generating unit, determining whether a protection operation release condition of a preset item is satisfied using measured state data of the battery, and releasing the battery protection operation of the generated item when the protection operation release condition is satisfied; an abnormal measure satisfaction condition comparison determination unit configured to: dividing categories to which items of battery protection operations generated in the battery protection operation generation unit belong, and comparing and determining whether an occurrence state of the protection operation satisfies an abnormal measure satisfaction condition corresponding to the divided categories; and an abnormal measure unit configured to: when it is determined that the occurrence state of the battery protection operation satisfies the abnormal measure satisfaction condition corresponding to the division category based on the determination result of the abnormal measure satisfaction condition comparison determination unit, a predetermined abnormal measure corresponding to the division category is taken.

In detail, the abnormal measure satisfaction condition comparison determining unit includes: a protection operation item classifying unit configured to output a first classification signal or a second classification signal by classifying whether the item of the protection operation generated in the battery protection operation generating unit belongs to a preset first class or second class; a number of occurrences comparing unit configured to: when any one of the first classification signal and the second classification signal is output from the protection operation item classification unit, comparing whether the number of occurrences of the protection operation in the corresponding item up to the current period is greater than or equal to a first reference number, and if greater than or equal to the first reference number, outputting a number-of-times satisfaction signal; and an occurrence duration comparison unit configured to: when the second classification signal is output from the protection operation item classification unit, it is compared whether the occurrence state of the protection operation of the corresponding item continues beyond the reference time, and if equal to or greater than the reference time, a duration satisfaction signal is output.

Further, the abnormal measure unit includes: a state confirmation notification unit configured to: providing a battery state confirmation notification alarm when the number of times of output from the occurrence number comparing unit satisfies a signal in a state that the first classification signal is output from the protection operation item classifying unit; a control value initializing unit configured to: when the number of times satisfaction signal is output from the occurrence number comparing unit in a state in which the first classification signal is output from the protection operation item classifying unit, or when the number of times satisfaction signal is output from the occurrence number comparing unit and the duration satisfaction signal is output from the occurrence duration comparing unit in a state in which the second classification signal is output from the protection operation item classifying unit, the battery control value currently set in the memory is initialized to the initial battery control value.

Further, after the battery state confirmation notification alarm is provided by the state confirmation notification unit of the abnormal measure unit, the occurrence number comparison unit compares whether the occurrence number of the protection operation of the corresponding item is greater than or equal to the second reference number, and if it is equal to or greater than the second reference number, outputs an additional number satisfaction signal.

Accordingly, the abnormal measure unit further includes an operation preventing unit configured to permanently prevent the operation of the battery when the additional number of times satisfaction signal is output from the number of occurrences comparing unit.

A battery protection system according to another embodiment of the present invention includes: a state data measurement unit configured to measure state data of a battery including at least two battery packs at regular intervals; a battery protection operation generation unit configured to: comparing whether the voltage of each battery pack satisfies a preset overvoltage protection operation generation condition based on the state data of the battery measured by the state data measurement unit, and generating an overvoltage protection operation in the satisfied battery pack; an abnormal measure satisfaction condition comparison determination unit configured to: comparing whether a voltage difference between an overvoltage protection operation generating battery in which an overvoltage protection operation is generated by the battery protection operation generating unit and a battery having a lowest voltage compared to the overvoltage protection operation generating battery is included in a predetermined reference voltage difference range, and determining whether an abnormal measure satisfaction condition is met by the overvoltage protection operation generating battery when included; and an abnormal measure unit configured to take a predetermined abnormal measure corresponding to the abnormal measure when it is determined that the abnormal measure satisfies the condition at the abnormal measure satisfaction condition comparison determination unit.

Further, the battery protection system further includes a battery protection operation releasing unit that compares whether or not the voltage of the corresponding battery pack satisfies a preset protection operation releasing condition based on the state data of the battery measured after the overvoltage protection operation is generated by the battery protection operation generating unit in at least one battery pack, and releases the protection operation generated in the corresponding battery pack when the voltage satisfies the preset protection operation releasing condition.

Further, the abnormal measure satisfaction condition comparison determining unit includes: a reference voltage difference range comparing unit configured to compare whether a voltage difference between the overvoltage protection operation generating battery and a battery having a lowest voltage compared to the overvoltage protection operation generating battery is included in a predetermined reference voltage difference range, and if so, to output a difference condition satisfaction signal; and a number-of-occurrences comparing unit configured to: after the difference condition satisfaction signal is outputted from the reference voltage difference range comparing unit, it is compared whether the number of consecutive occurrences of the overvoltage protection operation in the overvoltage protection operation occurrence battery is equal to or greater than the first reference number, and the number of times satisfaction signal is outputted if it is greater than or equal to the first reference number.

In addition, the abnormal measure unit includes: a state confirmation notification unit configured to provide a battery state confirmation notification alarm when the difference condition satisfaction signal is output from the reference voltage difference range comparison unit; and a buffer voltage control unit configured to lower a buffer voltage value currently set in the corresponding battery pack by a predetermined reference voltage value when the number of times of output from the number of occurrences comparing unit satisfies a signal.

Further, the occurrence number comparing unit compares whether the number of consecutive occurrences of the overvoltage protection operation in the corresponding battery pack is the second reference number or more after the buffer voltage drop adjustment of the buffer voltage control unit, and outputs an additional number satisfying signal if it is equal to or more than the second reference number.

Accordingly, the abnormal measure unit further includes an operation preventing unit that takes an additional abnormal measure that permanently prevents the operation of the battery when the additional number of times satisfaction signal is output from the number of occurrences comparing unit.

Further, the predetermined reference voltage difference range is set to be greater than or equal to the first reference voltage difference but less than the second reference voltage difference.

Beneficial technical effects

The present invention can improve battery safety by preventing the occurrence of safety problems in advance by supplementing repeated use conditions for simple battery operation failure and reinforcing a protection operation for safety problems such as fire and heat.

Drawings

Fig. 1 is a diagram showing a battery protection method according to embodiment 1 of the present invention.

Fig. 2 is a diagram showing a battery protection method according to embodiment 2 of the present invention.

Fig. 3 is a diagram showing a battery protection system according to embodiment 1 of the present invention.

Fig. 4 is a diagram showing a battery protection system according to embodiment 2 of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention may, however, be embodied in various forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted for clarity of description of the present invention, and like reference numerals denote like elements throughout the specification.

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

1. The terminology used in the present invention

1.1. Battery protection operation item

The term of the battery protection operation refers to a well-known type of battery protection operation that is operated to protect a battery from abnormal charge/discharge, short circuit, over-temperature, and the like.

The items of the battery protection operation include overvoltage protection (OVP), undervoltage protection (UVP), discharge over-current protection (DOCP), charge over-current protection (COCP), discharge over-temperature protection (DOTP), discharge under-temperature protection (DUTP), charge over-temperature protection (COTP), charge under-temperature protection (CUTP), short-circuit protection, battery unbalance protection, and FET error protection.

1.2. First category and second category

The present invention sets the items of each battery protection operation described above by classifying the items that are likely to be expressed as safety problems, such as fire and heat, and the items that are unlikely to be expressed as safety problems into a first category and a second category.

The first category is a category to which an item that may be expressed as a safety problem in the battery protection operation item belongs, and includes overvoltage protection (OVP), charge overcurrent protection (COCP), battery unbalance protection, and FET error protection.

The second category is a category to which an item that is unlikely to be expressed as a safety problem in the battery protection operation item belongs, and includes undervoltage protection (UVP), discharge overcurrent protection (DOCP), discharge overtemperature protection (DOTP), discharge undertemperature protection (DUTP), charge overtemperature protection (COTP), charge undertemperature protection (cut), and short-circuit protection.

1.3. Status data

The battery state data measured in the present invention may include a voltage, a current of each battery cell, a current of the shunt resistor, a voltage across the shunt resistor, and a temperature value of the thermistor.

In order to determine whether or not to occur/cancel a battery protection operation of each item using such status data, a known technique for each protection operation item is used.

For example, in the case of an overvoltage/low voltage/overcurrent/low current protection operation, whether the measured voltage/current value is equal to or greater than/lower than each set reference value may be compared to determine whether an overvoltage/low voltage/overcurrent/low current protection operation occurs. In the case of the FET error protection operation, it can be determined that the current value of the shunt resistor is higher than the set reference value even if the charge/discharge FET is turned off. In the case of the over temperature/low temperature protection operation, it may be determined whether or not it occurs that the measured thermistor temperature value is higher/lower than each set reference value. In the case of a short-circuit protection operation, the voltage value across the shunt resistor and the shunt resistor value may be used to determine whether the short-circuit protection operation has occurred.

2. Battery protection method according to the present invention

The method for protecting a battery according to the present invention includes two embodiments.

< embodiment 1: battery protection operation method for protecting battery by abnormal measure according to item >

Referring to fig. 1, embodiment 1 classifies items of each battery protection operation into two categories according to the possibility of a safety problem, and takes an abnormal measure to protect a battery in a manner of compensating for a simple battery operation failure due to actual normal or noise according to whether or not a protection operation occurrence state satisfies a condition corresponding to the above-described classified categories, and prevents occurrence of a safety problem in advance.

2.1. State data measurement step S100

The state data measurement step S100 is a step of measuring state data of the battery at regular intervals.

2.2. Protection operation generation step S200

The protection operation generation step S200 is the following steps: the state data of the battery measured in the state data measuring step S100 is used to determine whether the state of the battery satisfies the preset battery protection operation generation condition for each protection operation item of each battery, and the battery protection operation of the item determined to be satisfied is generated.

2.3. Protection operation release step S300

The protection operation release step S300 is the following steps: the state data of the battery measured after the battery protection operation of at least one item has occurred through the protection operation generation step S200 is used to determine whether the battery protection operation release condition of the previously generated item is satisfied, and when satisfied, the generated battery protection operation is released such that the battery is operated in the normal operation mode. Methods of determining whether to release the generated protection operation also use known techniques.

2.4. Abnormal measure step S400

The abnormal measure step S400 is the following steps: the categories to which the items of the battery protection operation generated in the protection operation generating step S200 belong are divided, and it is determined whether the occurrence state of the battery protection operation satisfies the abnormal measure satisfaction condition corresponding to the divided categories, so that a predetermined abnormal measure corresponding to the corresponding category is taken when it is determined that the abnormal measure satisfaction condition is satisfied.

The abnormal measure step S400 is configured to include the following detailed steps.

2.4.1. Category classification step S410

First, a category classification step S410 of classifying which of the first category and the second category the item of the battery protection operation generated in the protection operation generation step S200 belongs to is performed.

Here, as described above, the first category is a category to which an item of a protection operation that is likely to be expressed as a problem concerning safety (such as heat generation, fire, etc.) belongs, and the second category is a category to which a protection operation item that is unlikely to be expressed as a problem concerning safety (such as heat generation and fire) belongs.

2.4.2. Abnormal measure satisfaction determination step S420

The abnormal measure satisfaction determination step S420 is the following step: after classifying the category to which the item of the battery protection operation belongs, which occurs in the category classification step S410, it is determined whether the generated state of the generated battery protection operation satisfies an abnormal measure satisfaction condition corresponding to the classified category.

Specifically, when the items of battery protection operations that have occurred belong to the first category, the occurrence number comparison step S422-a is performed to compare whether the cumulative number of battery protection operations of the corresponding items up to the current period is equal to or greater than the first reference number. If the cumulative occurrence number is equal to or greater than the first reference number, it is determined that a condition that satisfies an abnormal measure corresponding to the first category is satisfied.

When the cumulative occurrence number (i.e., the number of times of occurrence of the battery protection operation of the same item) does not reach the first reference number, no additional abnormal measures are taken to achieve normal battery operation depending on whether the battery protection operation release condition of the relevant item is satisfied.

On the other hand, if the generated item of the battery protection operation belongs to the second category, the occurrence number comparing step S422-B is performed to compare whether the accumulated number of battery protection operations of the corresponding item up to the current period is equal to or greater than the first reference number, and the generation continuation checking step S424 is performed to check whether the state in which the battery protection operation has occurred continues beyond the reference time. If the cumulative occurrence number (i.e., the occurrence number of the battery protection operation of the same item) is equal to or greater than the first reference number and there is a state in which the protection operation occurrence state continues to exceed the reference time, it is determined that the condition for satisfying the abnormal measure corresponding to the second category is satisfied.

Here, the first reference number may be set to, for example, three, and the reference time may be set to, for example, 10 minutes.

2.4.3. Abnormal measure operation step S430

The abnormal measure operation step S430 is a step of taking a predetermined abnormal measure corresponding to the corresponding category when it is determined that the abnormal measure is satisfied in the determination step S420. In the present embodiment, the predetermined abnormal measures may include a state confirmation notification alarm generation measure and a battery control value initialization measure, which will be described later, and also include an abnormal measure that prevents the battery from operating.

Specifically, when it is determined that the item of the battery protection operation that has occurred satisfies the condition that the abnormal measure corresponding to the first category is satisfied, a notification alert providing step S432-a of providing a state confirmation notification alert notifying the battery state check and a control value initializing step S434-a of initializing the battery control value set in the current memory (e.g., RAM) to the initial battery control value are performed.

On the other hand, when it is determined that the item of the battery protection operation that has occurred satisfies the condition that the abnormal measure corresponding to the second class is satisfied, a control value initialization step S434-B of initializing the battery control value currently set in the memory (RAM) to the initial battery control value is performed.

Here, the initialization of the memory setting value may be implemented in the form of, for example, reading a ROM value and writing it to the RAM.

2.4.4. Additional abnormal measures operation S440

The additional countermeasure operation step S440 is the following steps: an abnormal measure corresponding to the first category in the abnormal measure operation step S430 is taken, and then an additional abnormal measure is taken to permanently prevent the operation of the battery when the battery protection operation of the same item occurs beyond the second reference number of times.

In the case of the battery protection operation of the item belonging to the first category, although the first abnormal measure is taken to initialize the memory and provide the battery state confirmation notification alarm through the abnormal measure operation step S430, since the battery protection operation of the same item is continuously repeated, this will cause the battery to deteriorate, and in order to prevent this in advance, if the battery protection operation additionally occurs the second reference number of times, the battery operation is permanently prevented.

Here, the second reference number may be set to, for example, two.

< embodiment 2: method for protecting battery using abnormal measure before battery unbalance protecting operation occurs

Referring to fig. 2, in embodiment 2, when an overvoltage protection operation occurs in a specific battery pack, if a voltage difference between the battery pack and the lowest voltage battery pack satisfies a standard condition, as an abnormal measure, measures to prevent overcharge of the battery pack are taken by first providing a notification for checking a battery state and lowering a buffer voltage, and if the overvoltage protection operation continues to occur in the corresponding battery pack even after that, the battery is protected in a manner to prevent a safety problem from occurring in advance by taking a secondary measure to permanently prevent the battery operation.

2.1. State data measurement step S1000

The state data measurement step S1000 is a step of measuring state data of the battery at regular intervals.

2.2. Battery protection operation generation step S2000

The battery protection operation generation step S2000 generates an overvoltage protection operation for the satisfied battery packs by comparing whether the voltage of each battery pack being charged satisfies a preset overvoltage protection operation occurrence condition based on the state data of the battery measured in the state data measurement step S1000.

2.3. Group voltage difference calculation step S3000

The group voltage difference calculation step S3000 is the following steps: the voltage difference between the overvoltage protection operation generating battery pack in which the overvoltage protection operation occurs in the battery protection operation generating step S2000 and the battery pack having the lowest voltage compared to the overvoltage protection operation generating battery pack is calculated.

2.4. Notification alarm generation step S4000

The notification alarm generation step S4000 is the following steps: comparing whether the voltage difference calculated in the group voltage difference calculating step S3000 is included in a predetermined reference voltage difference range, and if so, generating a state confirmation notification alarm for the overvoltage protection operation generating the battery.

Here, the predetermined reference voltage difference range is set to be greater than the first reference voltage difference but less than the second reference voltage difference.

In this case, the first reference voltage difference may correspond to a predetermined range of the second reference voltage difference, for example, may be a value corresponding to 80%. The second reference voltage difference may be a value corresponding to a condition for determining that the battery unbalance protection operation in the battery protection operation item occurs.

In other words, when the overvoltage protection operation occurs with a voltage difference between the battery pack and the lowest voltage battery pack greater than a predetermined range of the battery unbalance protection operation level, in one embodiment, a state confirmation notification alarm is generated when 80% or more.

The reason for this is to prevent the development of safety problems such as rapid deterioration and heat generation and fire due to excessive use of a specific battery pack due to an unbalanced state in advance even before the state of voltage difference between the battery packs reaches the battery unbalance protection operating condition.

2.5. Buffer voltage drop adjustment step S5000

The buffer voltage drop adjustment step S5000 is the following step: it is checked whether the overvoltage protection operation continues beyond the first reference number of times in the same battery pack after the occurrence of the state confirmation notification alarm in the notification alarm generation step S4000, and in the event of occurrence, the buffer voltage value currently set for the corresponding battery pack is lowered by a predetermined reference voltage value. The down-regulation of the buffer voltage may employ a method of down-regulating the preset buffer voltage by a predetermined reference voltage (e.g., 0.5V) or by a predetermined percentage.

2.6. Battery operation permanent shutdown step S6000

The battery operation permanent shutdown step S6000 checks whether the overvoltage protection operation additionally occurs more than the second reference number of times in the same battery pack after the buffer voltage is adjusted down through the buffer voltage drop adjustment step S6000, and permanently shuts down the operation of the battery if it occurs.

Although the first abnormal measure for preventing the overcharge of the battery pack from occurring by notifying the alarm generating step S4000 and the buffer voltage drop regulating step S5000 is taken, in the case of continuous overvoltage protection operation in the same battery pack, due to the concern about safety problems, additional abnormal measures for permanently preventing the battery operation are taken even before the occurrence of the battery unbalance protection operation and this is to protect the battery by preventing the occurrence of safety problems in advance.

3. Battery protection system according to the present invention

The battery protection system according to the present invention includes two embodiments.

< embodiment 1: method for protecting battery by using abnormal measure according to battery protection operation item

Fig. 3 is a diagram showing the configuration of a battery protection system according to embodiment 1 of the present invention.

Referring to fig. 3, the battery protection system according to embodiment 1 classifies items of each battery protection operation into two categories according to the possibility of a safety problem, takes the above-described abnormal measures according to whether the protection operation occurrence state satisfies the condition corresponding to the classified categories, protects the battery in a manner of compensating for a simple battery operation failure due to actual normal or noise, and prevents the occurrence of a safety problem in advance.

3.1. Battery (not shown)

The battery of the present invention is configured to include at least two or more battery packs configured to include a plurality of battery cells.

3.2. Status data measurement unit 100

The state data measurement unit 100 is configured to measure state data of the battery at regular intervals.

As described above, the battery state data measured in the present invention includes the voltage of each battery cell, the current of the shunt resistor, the voltage across the shunt resistor, and the temperature value of the thermistor, and the method of measuring each of them uses known techniques.

3.3. Battery protection operation generation unit 200

The battery protection operation generation unit 200 determines whether the battery state satisfies a preset battery protection operation generation condition for each protection operation item of each battery by using the state data of the battery measured by the state data measurement unit 100 to generate a battery protection operation of the item determined to be satisfied.

The generation of the battery protection operation may be implemented, for example, in the form of outputting a protection operation generation signal indicating the occurrence of the battery protection operation of the corresponding item.

3.4. Battery protection operation release unit 300

The battery protection operation release unit 300 determines whether a battery protection operation release condition of a preset item is satisfied using the state data of the battery measured by the state data measurement unit 100 after the battery protection operation of at least one item is generated by the battery protection operation generation unit 200, and cancels the battery protection operation of the generated item if the battery protection operation release condition of the preset item is satisfied.

The release of the battery protection operation may be implemented, for example, in the form of outputting a protection operation release signal indicating the release of the battery protection operation of the corresponding item.

3.5. Abnormal measure satisfaction condition comparison determination unit 400

The abnormal measure satisfaction condition comparison determination unit 400 classifies the categories to which the items of the battery protection operation generated in the battery protection operation generation unit 200 belong, and compares and determines whether the occurrence state of the battery protection operation satisfies the abnormal measure satisfaction condition corresponding to the classified categories.

The abnormal measure satisfaction condition comparison determination unit 400 may be configured to include the following detailed configuration.

3.5.1. Protection operation item classification unit 410

The protection operation item classifying unit 410 performs a task of classifying/classifying whether the items of the battery protection operation generated in the battery protection operation generating unit 200 belong to a preset first category or second category. The item classification of the protection operation may be divided by receiving the protection operation generation signal for each item described above.

When the generated item of the battery protection operation belongs to the first category, for example, a first classification signal indicating this may be output.

On the other hand, when the generated item of the battery protection operation belongs to the second category, for example, a second category signal indicating this may be output.

3.5.2. The occurrence number comparison unit 420

If the item of the battery protection operation generated by the protection operation item classifying unit 410 is classified as belonging to the first category or the second category, the occurrence number comparing unit 420 compares whether the accumulated number of battery protection operations of the same item up to the current period is equal to or greater than a first reference number, and outputs a frequency satisfaction signal when equal to or greater than the first reference number.

More specifically, when any one of the first classification signal and the second classification signal is output from the protection operation item classification unit 410, by comparing whether the accumulated number of times of battery protection operation corresponding to the signal occurring until the current period is equal to or greater than the first reference number, if it is equal to or greater than the first reference number, a number-of-times satisfaction signal indicating this may be output.

Here, the first reference number may be set to, for example, three times.

Meanwhile, after providing a battery state confirmation notification alarm of the abnormal measure unit 500, which will be described later, by comparing whether the number of times of battery protection operation of an item corresponding to the battery state confirmation notification alarm occurs in the battery protection operation generating unit 200 is greater than or equal to a second reference number, if it is equal to or greater than the second reference number, the occurrence number comparing unit 420 outputs an additional number-of-times satisfaction signal.

Here, the second reference number may be set to, for example, two.

3.5.3. The occurrence duration comparison unit 430

When the generated item of the battery protection operation is classified as belonging to the second category by the protection operation item classification unit 410, the occurrence duration comparison unit 430 checks whether the occurrence state of the corresponding battery protection operation continues beyond the reference time, and outputs a duration satisfaction signal if it is equal to or greater than the reference time.

In other words, when the second classification signal is output from the protection operation item classification unit 410, it is possible to compare whether the occurrence state of the corresponding battery protection operation continues beyond the reference time, and if equal to or greater than the reference time, output a duration satisfaction signal indicating this.

The time to maintain the battery protection operation generation state may be realized, for example, in the form obtained by outputting the time/time point of the protection operation release signal for the generated battery protection operation from the battery protection operation release unit 300.

Here, the reference time may be set to, for example, 10 minutes.

3.6. Abnormal measure unit 500

As a result of the determination by the abnormal measure satisfaction condition comparison determination unit 400, when it is determined that the occurrence state of the battery protection operation satisfies the condition that the abnormal measure corresponding to the divided category is satisfied, the abnormal measure unit 500 takes a predetermined abnormal measure corresponding to the divided category.

The abnormal measure unit 500 may be configured to include the following detailed configuration.

3.6.1. State confirmation notification unit 510

When the number-of-occurrences meeting signal is output from the number-of-occurrences comparing unit 420 in a state where the first classification signal is output from the protection operation item classifying unit 410, the state confirmation notifying unit 510 provides a battery state confirmation notifying alarm as an abnormal measure.

In other words, when the battery protection operation of the same item belonging to the first category, which may be expressed as a safety (fire, heat generation) problem, occurs more than a first reference number of times (e.g., 3 times), a battery state confirmation notification alarm will be provided to the user.

3.6.2. Control value initializing unit 520

When the number-of-times satisfaction signal is output from the occurrence-time comparing unit 420 in a state in which the first classification signal is output from the protection operation item classifying unit 410, or when the number-of-times satisfaction signal from the occurrence-time comparing unit 420 and the duration satisfaction signal from the duration-of-occurrence comparing unit 430 are output in a state in which the second classification signal is output from the protection operation item classifying unit 410, the control value initializing unit 520 initializes the battery control value changed and set in the current memory (RAM) to the initial battery control value as an abnormal measure.

In other words, when the number of occurrences of battery protection operations of the same item belonging to the first category that may be expressed as a safety (fire, heat generation) problem is greater than the first reference number (e.g., 3 times), or when the number of occurrences of battery protection operations of the item belonging to the second category that may be expressed as a safety (fire, heat generation) problem is the first reference number (e.g., 3 times) or more, and the battery protection operations continue beyond the reference time in the occurrence state, the battery will be restored to the initial normal mode by initializing the current battery control value to the initial battery control value.

3.6.3. Operation preventing unit 530

The operation preventing unit 530 is configured to take an additional abnormal measure to permanently prevent the operation of the battery when the additional number of times satisfying signal is output from the number of occurrences comparing unit 420.

In the case of the battery protection operation of the item belonging to the first category, although the state confirmation notification unit 510 and the control value initialization unit 520 provide a battery state confirmation notification alarm and take a first abnormal measure to initialize the memory, since the battery protection operation of the same item is continuously repeated, battery degradation will be caused, and in order to prevent this in advance, if an additional second reference number of times occurs to the battery protection operation of the same item, the battery operation will be permanently cut off.

< embodiment 2: method for protecting a battery as an exception before an unbalanced protection operation of the battery occurs >

Fig. 4 is a diagram showing the configuration of a battery protection system according to embodiment 2 of the present invention.

Referring to fig. 4, in the battery protection system according to embodiment 2, when an overvoltage protection operation occurs in a specific battery pack, if a voltage difference between the battery pack and the lowest voltage battery pack satisfies a standard condition, measures to prevent overcharge of the battery pack are taken by first providing a notification for checking a battery state and lowering a buffer voltage, and if the overvoltage protection operation continues to occur in the corresponding battery pack even after that, the battery is protected in advance by taking secondary measures to permanently prevent the battery operation from occurring. In the case of the system according to embodiment 2, some components of the system according to embodiment 1 described above are identical, but may be realized by additionally including a configuration to be described later or by changing the functions of some components. Therefore, with respect to the system according to embodiment 2, description of the same configuration or function as in embodiment 1 will be omitted, and description will be focused on the added or different configuration/function.

3.3. Battery protection operation generation unit 200

The battery protection operation generation unit 200 compares whether the voltage of each battery pack satisfies a preset overvoltage protection operation generation condition based on the state data of the battery measured by the above-described state data measurement unit 100 to generate an overvoltage protection operation for the battery pack that satisfies the requirement. For example, the overvoltage protection operation generation signal may be output. Here, the overvoltage protection operation generation signal may include an identification number for identifying the corresponding battery pack.

Hereinafter, the battery pack corresponding to the occurrence of the overvoltage protection operation may be referred to and described as a battery pack corresponding to the occurrence of the overvoltage protection operation.

3.4. Battery protection operation release unit 300

The battery protection operation releasing unit 300 compares whether the voltage of the corresponding battery pack satisfies a preset overvoltage protection operation releasing condition based on the state data of the battery measured after the overvoltage protection operation is generated by the battery protection operation generating unit 200 in at least one or more battery packs, and if so, releases the protection operation generated in the corresponding battery pack. For example, an overvoltage protection operation release signal may be output.

3.5. Abnormal measure satisfaction condition comparison determination unit 400

The abnormal measure satisfaction condition comparison determining unit 400 determines whether a voltage difference between the overvoltage protection operation generating battery in which the overvoltage protection operation is generated by the battery protection operation generating unit 300 and the battery having the lowest voltage compared to the overvoltage protection operation generating battery corresponds to a predetermined reference voltage difference range, and compares and determines whether the overvoltage protection operation generating battery satisfies the abnormal condition satisfaction condition if the voltage difference corresponds to the predetermined reference voltage difference range.

3.5.1. Reference voltage difference range comparing unit 410

The reference voltage difference range comparing unit 410 may be configured to include a voltage difference calculating unit (not shown) for calculating a voltage difference between the overvoltage protection operation generating battery and the battery having the lowest voltage compared to the overvoltage protection operation generating battery. Further, it is possible to compare whether the voltage difference calculated by the voltage difference calculating unit (not shown) is included in a predetermined reference voltage difference range, and if so, output a difference condition satisfaction signal indicating this.

In this case, the first reference voltage difference may be set to a value corresponding to 80% of the second reference voltage difference.

In other words, the overvoltage protection operation occurs when the voltage difference between the battery pack and the lowest voltage battery pack exceeds a predetermined range of the battery unbalance protection operation level, and in an embodiment, when it is 80% or more, the output difference condition satisfies the signal.

3.5.2. The occurrence number comparison unit 420

After outputting the difference condition satisfaction signal from the reference voltage difference range comparing unit 410, the occurrence number comparing unit 420 may output the number satisfaction signal when equal to or greater than the first reference number by comparing whether the consecutive occurrence number of the overvoltage protection operation in the corresponding overvoltage protection operation is greater than or equal to the first reference number.

Here, the first reference number may be set to, for example, three times.

On the other hand, the occurrence number comparing unit 420 compares whether the number of consecutive occurrences of the overvoltage protection operation in the corresponding battery pack is equal to or greater than the second reference number after the buffer voltage drop adjustment of the buffer voltage control unit 520, which will be described later, and outputs an additional number satisfying signal if it is equal to or greater than the second reference number.

Here, the second reference number may be set to, for example, two.

3.6. Abnormal measure unit 500

When it is determined that the abnormal measure is satisfied based on the determination result of the abnormal measure satisfaction condition comparison determination unit 400, the abnormal measure unit 500 is configured to take a predetermined abnormal measure corresponding thereto.

3.6.1. State confirmation notification unit 510

When a difference condition satisfaction signal indicating that the voltage difference between the overvoltage protection operation-occurring battery pack and the battery pack having the lowest voltage compared to the overvoltage protection operation-occurring battery pack is the state corresponding to the reference voltage difference range is output from the reference voltage difference range comparing unit 410, the state confirmation notifying unit 510 provides a battery state confirmation notification alarm as an abnormal measure.

3.6.2. Buffer voltage control unit 520

When a number-of-times satisfaction signal (the overvoltage protection operation corresponds to the difference condition satisfaction signal) indicating that the overvoltage protection operation has occurred more than the first reference number of times in the battery pack is output from the occurrence number comparison unit 420, the buffer voltage control unit 520 decreases the buffer voltage value currently set in the corresponding battery pack by a predetermined reference voltage value as an abnormal measure.

For example, during the buffer voltage drop adjustment, a buffer voltage drop signal may be output.

3.6.3. Operation preventing unit 530

When an additional number-of-times satisfaction signal indicating that the overvoltage protection operation has additionally occurred the second reference number of times is output from the occurrence number comparing unit 420 to the battery pack in which the buffer voltage is down-regulated, the operation preventing unit 530 is configured to take additional abnormal measures to permanently prevent the operation of the battery.

Although the state confirmation notification unit 510 and the buffer voltage control unit 520 take the first abnormal measure to prevent the overcharge of the battery pack according to the occurrence of the overvoltage protection operation, in the case of the continuous overvoltage protection operation in the same battery pack, due to the concern about the safety problem, additional abnormal measures to permanently prevent the battery operation are taken even before the occurrence of the battery unbalance protection operation, and this is to protect the battery by preventing the occurrence of the safety problem in advance.

The configuration according to embodiment 1 or embodiment 2 described above may be implemented in a main IC that controls battery operation.

On the other hand, although the technical concept of the present invention has been specifically described according to the above embodiments, it should be noted that the above embodiments are for the purpose of illustration and not limitation. Furthermore, those skilled in the art to which the invention pertains will appreciate that various embodiments are possible within the spirit of the invention.

The meaning of the symbols used in the description of the invention and the accompanying drawings is as follows: 100: state data measuring unit

200: battery protection operation generating unit

300: battery protection operation release unit

400 abnormal measure meeting condition comparison and determination unit

410: protection operation item classification unit

420: generation number comparison unit

430: generation duration comparison unit

500: abnormal measure unit

510: state confirmation notification unit

520: control value initializing unit

530: operation preventing unit

Claims

1. A battery protection method, comprising:

a state data measurement step of measuring state data of the battery at regular intervals;

a protection operation generating step of determining whether the state of the battery satisfies a preset protection operation generating condition for each protection operation item of each battery using the state data of the battery measured in the state data measuring step, and generating a battery protection operation for the item determined to be satisfied;

a protection operation releasing step of determining whether a protection operation releasing condition of a preset occurrence item is satisfied by using measured state data of the battery after at least one item of battery protection operation has occurred through the protection operation generating step, and releasing the generated protection operation when satisfied, so that the battery is operated in a normal operation mode; and

An abnormal measure step of dividing categories to which items of the protection operation that occur in the protection operation generation step belong, and taking predetermined abnormal measures corresponding to the respective categories when it is determined that the abnormal measures corresponding to the divided categories are satisfied by determining whether an occurrence state of the protection operation satisfies a condition for the abnormal measure corresponding to the divided categories.

2. The battery protection method according to claim 1, wherein the abnormal measure step includes:

a category classification step of classifying which category of the first category and the second category the item of the protection operation generated in the protection operation generation step belongs to;

an abnormal measure satisfaction determining step of determining whether an occurrence state in which the protection operation occurs satisfies an abnormal measure satisfaction condition corresponding to the classified category after the classification of the category to which the item of the protection operation belongs, which occurs in the category classifying step; and

an abnormal measure operation step of taking a predetermined abnormal measure corresponding to the corresponding category when it is determined that the abnormal measure is satisfied.

3. The battery protection method according to claim 2, wherein the abnormal measure satisfaction determining step includes:

When an item in which the protection operation occurs is in the first category, performing a number-of-occurrences comparing step of comparing whether the number of occurrences of the protection operation of the corresponding item up to a current period is equal to or greater than a first reference number, and if the number of occurrences is greater than or equal to the first reference number, determining that a condition that an abnormal measure corresponding to the first category is satisfied; and

if the above item in which the protection operation has occurred belongs to the second category, a generation continuation checking step of comparing whether the number of occurrences of the protection operation of the item until the current period is equal to or greater than the first reference number of times and checking whether the generation state of the corresponding protection operation continues to exceed a reference time is performed, and it is determined that a condition satisfying an abnormal measure corresponding to the second category is satisfied when the number of occurrences is greater than or equal to the first reference number of times and the corresponding protection operation generation state is a state that continues to exceed the reference time.

4. The battery protection method according to claim 3, wherein the abnormal measure operating step includes:

a notification alarm providing step of providing a battery state confirmation notification alarm when it is determined that an item of the protection operation that has occurred satisfies a condition of satisfying an abnormal measure corresponding to the first category; initializing a control value of the battery control value currently set in the memory to an initial battery control value; and

When it is determined that the item of the protection operation that has occurred satisfies the condition of satisfying the abnormal measure corresponding to the second category, a control value initialization step of initializing the battery control value currently set in the memory to an initial battery control value is performed.

5. The battery protection method according to claim 4, further comprising: and a step of permanently preventing an additional abnormal measure operation of the battery if the protection operation of the same item occurs more than a second reference number of times after the notification alarm providing step and the control value initializing step in the abnormal measure operation step are performed.

6. The battery protection method according to any one of claims 2, 3 and 4, wherein the first category is a category to which an item of a protection operation that may be expressed as a safety problem including heat generation and ignition belongs,

wherein the second category is a category to which an item that is unlikely to be expressed as a protection operation including a safety problem of heat generation and ignition belongs.

7. A battery protection method, comprising:

a state data measuring step of measuring state data of a battery including at least two battery packs at regular intervals;

A battery protection operation generation step of comparing whether or not the voltage of each battery pack being charged satisfies a preset overvoltage protection operation generation condition based on the state data of the battery measured in the state data measurement step, to generate an overvoltage protection operation for the battery pack satisfying the requirement;

a group voltage difference calculation step of calculating a voltage difference between the overvoltage protection operation generating group battery and the group battery having the lowest voltage compared to the overvoltage protection operation generating group battery in the battery protection operation generating step;

a notification alarm generation step of comparing whether the voltage difference calculated in the group voltage difference calculation step is included in a predetermined reference voltage difference range, and generating a state confirmation notification alarm for the overvoltage protection operation generation battery pack when included; and

a buffer voltage drop adjusting step of checking whether the overvoltage protection operation continues to occur more than a first reference number of times in the same battery pack after the occurrence of the state confirmation notification alarm of the notification alarm generating step, and in the event of occurrence, adjusting down a buffer voltage value currently set for the battery pack by a predetermined reference voltage value or a predetermined ratio (%) of the buffer voltage value currently set.

8. The battery protection method of claim 7, further comprising: after the buffer voltage drop adjustment by the buffer voltage drop adjustment step, checking whether the overvoltage protection operation continues to occur more than a second reference number of times in the same battery pack, and a battery operation permanent shutdown step of permanently preventing the operation of the battery if it occurs.

9. The battery protection method of claim 7, wherein the predetermined reference voltage difference range is equal to or greater than the first reference voltage difference but less than the second reference voltage difference.

10. The battery protection method according to claim 9, wherein the first reference voltage difference is a value corresponding to 80% of the second reference voltage difference,

wherein the second reference voltage difference is a value corresponding to a battery unbalance protection operation occurrence determination criterion.

11. A battery protection system, comprising:

a state data measurement unit configured to measure state data of the battery at regular intervals;

a battery protection operation generation unit configured to determine whether a state of the battery satisfies a preset protection operation generation condition for each protection operation item using the state data of the battery measured by the state data measurement unit, and generate a battery protection operation of the item determined to be satisfied;

A battery protection operation release unit configured to: after the protection operation of at least one item is generated by the battery protection operation generating unit, determining whether a protection operation release condition of a preset item is satisfied using the measured state data of the battery, and releasing the battery protection operation of the generated item when the protection operation release condition is satisfied;

an abnormal measure satisfaction condition comparison determination unit configured to: dividing categories to which items of battery protection operations generated in the battery protection operation generation unit belong, and comparing and determining whether an occurrence state of the protection operation satisfies an abnormal measure satisfaction condition corresponding to the divided categories; and

an abnormal measure unit configured to: when it is determined that the occurrence state of the battery protection operation satisfies an abnormal measure satisfaction condition corresponding to the divided category according to the determination result of the abnormal measure satisfaction condition comparison determination unit, a predetermined abnormal measure corresponding to the divided category is taken.

12. The battery protection system according to claim 11, wherein the abnormal measure satisfaction condition comparison determining unit includes:

a protection operation item classifying unit configured to output a first classification signal or a second classification signal by classifying whether an item of a protection operation generated in the battery protection operation generating unit belongs to a preset first class or a second class;

A number of occurrences comparing unit configured to: when any one of the first classification signal and the second classification signal is output from the protection operation item classification unit, comparing whether the number of occurrences of the protection operation in the corresponding item up to the current period is greater than or equal to a first reference number, and outputting a number-of-times satisfaction signal if greater than or equal to the first reference number; and

an occurrence duration comparison unit configured to: when a second classification signal is output from the protection operation item classification unit, it is compared whether the occurrence state of the protection operation of the corresponding item continues beyond a reference time, and if equal to or greater than the reference time, a duration satisfaction signal is output.

13. The battery protection system according to claim 12, wherein the abnormal measure unit includes:

a state confirmation notification unit configured to: providing a battery state confirmation notification alarm when the number of times satisfaction signal is output from the occurrence number comparing unit in a state in which the first classification signal is output from the protection operation item classifying unit;

a control value initializing unit configured to: when a number-of-times satisfaction signal is output from the occurrence-time comparing unit in a state in which the first classification signal is output from the protection-operation-item classifying unit, or when the number-of-times satisfaction signal is output from the occurrence-time comparing unit and the duration satisfaction signal is output from the occurrence-duration comparing unit in a state in which the second classification signal is output from the protection-operation-item classifying unit, a battery control value currently set in a memory is initialized to an initial battery control value.

14. The battery protection system according to claim 13, wherein the occurrence number comparing unit compares whether the occurrence number of the protection operation of the corresponding item is greater than or equal to a second reference number after a battery state confirmation notification alarm is provided by the state confirmation notifying unit of the abnormal measure unit, and outputs an additional number satisfying signal if it is equal to or greater than the second reference number.

15. The battery protection system according to claim 14, wherein the abnormal measure unit further comprises an operation preventing unit configured to permanently prevent an operation of the battery when an additional number of times satisfaction signal is output from the number of occurrences comparing unit.

16. The battery protection system according to claim 12, wherein the first category is a category to which an item of a protection operation that may be expressed as a safety issue including heat generation and ignition belongs,

17. A battery protection system, comprising:

a state data measurement unit configured to measure state data of a battery including at least two battery packs at regular intervals;

A battery protection operation generation unit configured to: comparing whether the voltage of each battery pack satisfies a preset overvoltage protection operation generation condition based on the state data of the battery measured by the state data measurement unit, and generating an overvoltage protection operation in the satisfied battery pack;

an abnormal measure satisfaction condition comparison determination unit configured to: comparing whether a voltage difference between an overvoltage protection operation generating battery in which the overvoltage protection operation is generated by the battery protection operation generating unit and a battery having a lowest voltage compared to the overvoltage protection operation generating battery is included in a predetermined reference voltage difference range, and determining whether an abnormal measure satisfaction condition is satisfied by the overvoltage protection operation generating battery when included; and

an abnormal measure unit configured to take a predetermined abnormal measure corresponding to the abnormal measure when it is determined at the abnormal measure satisfaction condition comparison determination unit that the abnormal measure satisfaction condition is satisfied.

18. The battery protection system according to claim 17, further comprising a battery protection operation releasing unit that compares whether or not a voltage of a corresponding battery pack satisfies a preset protection operation releasing condition based on state data of the battery measured after the overvoltage protection operation is generated by the battery protection operation generating unit in at least one battery pack, and releases a protection operation generated in the corresponding battery pack when the voltage satisfies the preset protection operation releasing condition.

19. The battery protection system according to claim 17, wherein the abnormal measure satisfaction condition comparison determining unit includes:

a reference voltage difference range comparing unit configured to compare whether a voltage difference between the overvoltage protection operation generating battery and a battery having a lowest voltage compared to the overvoltage protection operation generating battery is included in a predetermined reference voltage difference range, and if so, to output a difference condition satisfaction signal; and

a number of occurrences comparing unit configured to: after the difference condition satisfaction signal is output from the reference voltage difference range comparing unit, comparing whether the number of consecutive occurrences of the overvoltage protection operation in the overvoltage protection operation occurrence battery is equal to or greater than a first reference number, and outputting a number satisfaction signal if it is greater than or equal to the first reference number.

20. The battery protection system according to claim 19, wherein the abnormal measure unit includes:

a state confirmation notification unit configured to provide a battery state confirmation notification alarm when the difference condition satisfaction signal is output from the reference voltage difference range comparison unit; and

And a buffer voltage control unit configured to lower a buffer voltage value currently set in the corresponding battery pack by a predetermined reference voltage value when the number of times satisfaction signal is output from the number of occurrences comparison unit.

21. The battery protection system according to claim 20, wherein the occurrence number comparing unit compares whether the number of consecutive occurrences of the overvoltage protection operation in the corresponding battery pack is a second reference number or more after the buffer voltage drop adjustment of the buffer voltage control unit, and outputs an additional number satisfying signal if equal to or greater than the second reference number.

22. The battery protection system according to claim 21, wherein the abnormal measure unit further comprises an operation preventing unit that takes an additional abnormal measure to permanently prevent the operation of the battery when an additional number of times satisfaction signal is output from the number of occurrences comparing unit.

23. The battery protection system of claim 19 wherein the predetermined range of reference voltage differences is set to be greater than or equal to a first reference voltage difference but less than a second reference voltage difference.

24. The battery protection system of claim 23 wherein the first reference voltage difference is a value corresponding to 80% of the second reference voltage difference,