CN114600299A - Battery pack protection method and device - Google Patents

Battery pack protection method and device Download PDF

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Publication number
CN114600299A
CN114600299A CN202080074053.1A CN202080074053A CN114600299A CN 114600299 A CN114600299 A CN 114600299A CN 202080074053 A CN202080074053 A CN 202080074053A CN 114600299 A CN114600299 A CN 114600299A
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CN
China
Prior art keywords
battery pack
unit secondary
battery
voltage
abnormal state
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Pending
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CN202080074053.1A
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Chinese (zh)
Inventor
许冠洙
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Songuo Motors Co ltd
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Songuo Motors Co ltd
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Publication of CN114600299A publication Critical patent/CN114600299A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

Abstract

The invention discloses a battery pack protection method and device, which are used for accurately tracking the voltage change trend of each unit secondary battery connected in series and parallel in a battery pack on the basis of the gradient change of voltage waveform, implementing protection action when the unit secondary battery is observed to be abnormal, and simultaneously giving a warning to a user, wherein the protection action can be implemented even if the whole voltage of the battery pack is within a normal range. The battery pack protection method of the present invention may include a step of individually observing a change in voltage of each of unit secondary batteries connected in series and parallel in the battery pack, and a step of performing a protection operation when a unit secondary battery belonging to a preset abnormal state among the unit secondary batteries is observed. Further, the method may further include the step of issuing a warning to a user when the unit secondary battery is observed to belong to the abnormal state.

Description

Battery pack protection method and device
Technical Field
The present invention relates to a battery pack protection method and device for accurately tracking the voltage variation trend of each unit secondary battery connected in series and parallel in a battery pack based on the change of the inclination of the voltage waveform, and performing a protection operation when an abnormality of the unit secondary battery is observed, and giving a warning to a user, wherein the protection operation is performed even if the overall voltage of the battery pack is within a normal range.
Background
Secondary batteries are widely used not only in portable devices but also in Electric Vehicles (EV) or Hybrid Electric Vehicles (HEV) driven by an Electric power drive source, and the like, because of their wide product applicability and electrical characteristics such as high energy density.
Such a secondary battery not only can greatly reduce the use of fossil fuels, but also can not generate by-products at all due to the use of energy, and thus has attracted attention as a new energy source for environmental protection and improvement of energy efficiency.
The secondary battery mainly includes a positive electrode, a negative electrode, a separator, an active material, an electrolyte solution, and the like, and is configured to be capable of repeated charge and discharge by electrochemical reaction between constituent elements thereof. For example, the operating voltage of a polymer lithium ion battery is about 3.0V to 4.2V.
Therefore, in order to obtain a large-power battery pack that can be applied to electric vehicles and the like, a plurality of unit secondary batteries (cells) are connected in series and parallel to form a battery pack.
Meanwhile, such a battery pack applies algorithms that can control power supply to driving loads such as an engine, measure electrical characteristic values such as current and voltage, control charge and discharge, control voltage equalization (equalization), estimate soc (state Of charge), and the like, and also applies a bms (battery Management system) that monitors and controls the state Of a secondary battery.
Taking a lithium ion series battery as an example, when a lithium ion series battery is used, a battery protection module (PCM) or BMS is installed and used in order to remove instability of lithium itself.
However, in the battery pack in which a plurality of unit secondary batteries are connected in series and parallel, the structural characteristics are such that no special protection operation is performed when the battery pack is in normal operation, and the protection operation is performed only when a critical value at which abnormal operation occurs is exceeded, and therefore the protection method for the battery pack is too passive.
In other words, the conventional protection method for the battery pack is based on the overall operation of the battery pack, and is performed in a post-processing manner only when the protection condition is satisfied, so that there is a limitation in efficiency.
Disclosure of Invention
An embodiment of the present invention provides a battery pack protection method that precisely tracks a voltage change trend of each unit secondary battery connected in series and parallel in a battery pack based on a change in an inclination of a voltage waveform, and performs a protection operation when an abnormality of the unit secondary battery is observed, and also issues a warning to a user, and the protection operation is performed even if the entire voltage of the battery pack is within a normal range.
Meanwhile, embodiments of the present invention also provide a battery pack protection apparatus that can detect and take measures in advance when some unit secondary batteries are abnormal even if the overall voltage of the battery pack is within a normal range, thereby preventing accidents such as explosion or fire of the battery pack in advance.
The invention is realized by the following technical scheme:
a battery pack protection method comprising: the method includes a step of individually observing a voltage change of each unit secondary battery connected in series and parallel in a battery pack, and a step of performing a protection operation when a unit secondary battery belonging to a preset abnormal state among the unit secondary batteries is observed.
Meanwhile, the protection method of the battery pack may further include the step of issuing a warning to a user when the unit secondary batteries are observed to belong to the abnormal state.
The criterion for determining the abnormal state may be determined based on the inclination of the voltage waveform of each unit secondary battery.
In addition, the abnormal state may be determined by: it is determined that a specific unit secondary battery having a voltage waveform with a change in inclination different from that of other unit secondary batteries is in an abnormal state, or that a unit secondary battery having a change in inclination greater than a predetermined normal level due to a voltage drop or rise rate is in an abnormal state.
A battery pack protection device comprising: the battery pack protection device comprises a battery monitoring part for observing voltage changes of unit secondary batteries connected in series and parallel in the battery pack one by one, a processor for presetting conditions for judging the abnormity of the unit secondary batteries, judging whether the unit secondary batteries are abnormal one by one on the basis of information observed by the battery monitoring part and the set abnormity judging conditions, and a protection processing part for executing protection processing actions according to control signals sent by the processor after the processor judges the abnormity.
The battery pack protection device further includes a warning unit that is activated by a control signal generated by the processor when the processor determines an abnormality and notifies a user of an abnormal state of the battery pack.
In addition, the processor may determine the exception by: the voltage waveform of each unit secondary battery is compared with the voltage waveform of each other in the form of a graph, or the unit secondary battery having a voltage drop or increase rate larger than the normal level is determined to be in an abnormal state based on the normal level of the voltage drop or increase rate set in advance.
The invention has the following beneficial effects:
the embodiment of the invention precisely tracks the voltage change trend of each unit secondary battery connected in series and parallel in the battery pack on the basis of the gradient change of the voltage waveform, and implements protection action when the unit secondary battery is observed to be abnormal, and simultaneously gives a warning to a user, and the protection action can be implemented even if the overall voltage of the battery pack is in a normal range, so as to prevent the battery pack from generating problems in advance.
In addition, even if the overall voltage of the battery pack is within a normal range, if some of the unit secondary batteries are abnormal, the battery pack is prevented from accidents such as explosion or fire by finding and taking measures in advance.
Drawings
Fig. 1 is a flow chart of a battery pack protection method according to an embodiment of the present invention;
fig. 2 is an exemplary diagram regarding the observation that the voltage waveforms of the individual secondary batteries in the battery pack are in a normal state in the battery pack protection method according to the embodiment of the invention;
fig. 3 and 4 are exemplary diagrams regarding observation of a voltage waveform of a unit secondary battery in a battery pack in an abnormal state in a battery pack protection method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery pack protection device according to an embodiment of the present invention.
The battery pack comprises 10 a battery pack, 11 a unit secondary battery, 100 a battery monitoring part, 200 a processor, 300 a protection processing part, 400 and a warning part.
Detailed Description
The following detailed description of the invention can be read with reference to the accompanying drawings, which illustrate embodiments of the invention. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are not necessarily mutually exclusive, although they may be different. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from one embodiment or from the spirit and scope of the present invention. In addition, it is to be understood that the location or arrangement of individual elements within each described embodiment may be modified without departing from the spirit and scope of the invention.
Therefore, the detailed description is not to be taken in a limiting sense, and is limited only to the scope of the present invention, which is defined by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference symbols in the various drawings indicate the same or similar functionality in all respects.
Terms used in the present invention are selected as much as possible from general terms that are currently widely used, while considering functions of the present invention, but may be different according to intentions or examples of persons who practice the present invention, appearance of new technology, and the like. In addition, there may be terms arbitrarily selected by the applicant in some cases, and in such cases, the meanings thereof will be described in detail in the description section of the corresponding invention. Therefore, the terms used in the present invention are not simple term names but are defined based on the meaning of the terms and the overall contents of the present invention.
In the present invention, when a certain portion of the whole "includes" a certain constituent element, it means that the other constituent element may be included without excluding the other constituent element unless otherwise stated to the contrary. The terms "… section", "… … module" and the like described in the specification mean at least a unit for processing one function or processing one operation, and may be realized by hardware or software, or may be realized by a combination of hardware and software.
The first embodiment is as follows:
referring to fig. 1 to 5, a battery pack protection method and apparatus according to an embodiment of the present invention are described.
First, referring to fig. 1 to 4, a battery pack protection method according to an embodiment of the present invention is explained.
Fig. 1 is a flowchart illustrating a battery pack protection method according to an embodiment of the present invention.
As shown in fig. 1, in step S110, the voltage change of each unit secondary battery connected in series-parallel in the battery pack is individually observed.
In step S120, when it is observed that the unit secondary battery belongs to a preset abnormal state, a protection operation is performed.
Here, the criterion for determining the abnormal state may be based on the inclination of the voltage waveform of each unit secondary battery. For example, it is determined that a specific unit secondary battery having a voltage waveform with a change in inclination different from that of other unit secondary batteries is in an abnormal state, or that a unit secondary battery having a change in inclination greater than a predetermined normal level due to a voltage drop or a rate of rise is in an abnormal state.
In detail, in the battery pack in which a plurality of unit secondary batteries are connected in series and parallel, since a welded portion of a part of the unit secondary batteries may be detached according to manufacturing conditions or use conditions, when only the unit secondary batteries that are maintained in the connected state are charged and discharged, the voltage drop or the rate of rise of the unit secondary batteries that are disconnected is greater than that in the normal state.
In addition, in another example, in a unit secondary battery in which a contact failure occurs in a bus bar due to vibration or the like, the electrodes and the bus bar of the unit secondary battery repeatedly stick and fall depending on the charge/discharge temperature, and thus the voltage of the unit secondary battery fluctuates.
Referring to fig. 2 to 4, fig. 2 is an exemplary diagram of a battery pack protection method according to an embodiment of the present invention with respect to observing that voltage waveforms of unit secondary batteries of the battery pack are in a normal state.
In addition, fig. 3 and 4 are exemplary diagrams regarding the voltage waveform of the unit secondary batteries of the battery pack observed to be in an abnormal state in the battery pack protection method according to the embodiment of the present invention.
That is, fig. 3 shows that the voltage waveforms of the unit secondary batteries nos. i and iii are observed to be in an abnormal state, and fig. 4 shows that the voltage waveforms of the unit secondary batteries nos. ii, iii and fifthly are observed to be in an abnormal state.
The battery pack protection method of the present embodiment is a method of precisely tracking the inclination and change of the voltage waveform of the unit secondary batteries, and thereby performing a protection operation even if the entire voltage of the battery pack is within a normal range when a unit secondary battery having a voltage waveform different from that of another unit secondary battery is observed.
In the case of an electric vehicle, a hybrid vehicle, or the like, the inclination shape is determined from the current value because the actual environment of the vehicle does not have the conditions for continuous charging and continuous discharging.
As shown in fig. 1, in step S130, when the unit secondary battery belonging to the abnormal state is observed, a warning is given to the user.
Example two:
a battery pack protection apparatus according to an embodiment of the present invention will be described with reference to fig. 5.
Fig. 5 is a view showing an example of the structure of a battery pack protection apparatus according to an embodiment of the present invention.
It should be noted that the battery pack protection device of the present embodiment corresponds to a device that executes the battery pack protection method of fig. 1 to 4, and the configuration thereof is divided mainly by functions, and the specific configuration can be embodied in various forms by the disclosed technology.
As shown in fig. 5, the battery pack protection apparatus of the present embodiment includes a battery monitoring unit 100, a processor 200, and a protection processing unit 300. In addition, the battery pack protection apparatus of the present embodiment may further include a warning unit 400.
The battery monitoring unit 100 has a function of individually observing the voltage change of the unit secondary batteries 11 connected in series and parallel in the battery pack 10.
The processor 200 sets a condition for determining abnormality in order to determine abnormality of the unit secondary batteries 11, and determines whether or not the unit secondary batteries 11 are in an abnormal state one by one based on the observation information of the battery monitoring unit 100 and the set abnormality determination condition. Here, the above-described manner of determining the abnormality of the processor 200 is: the voltage waveform of each unit secondary battery 11 is changed in inclination, and the shapes of the graphs are compared with each other, or a unit secondary battery 11 having a voltage drop or a voltage rise rate higher than the normal level is determined to be in an abnormal state based on the predetermined normal level of the voltage drop or the voltage rise rate.
The protection processing unit 300 performs a protection processing operation based on a control signal generated when the processor determines an abnormality.
The warning unit 400 has a function of being activated by a control signal generated by the processor when the processor determines an abnormality, and notifying a user of an abnormal state of the battery pack 10.
As can be seen from the above description with reference to fig. 1 to 5, the battery pack protection method and apparatus of the present invention are: the voltage change trend of each unit secondary battery connected in series and parallel in the battery pack is precisely tracked on the basis of the change of the inclination of the voltage waveform, and when the unit secondary battery is observed to be abnormal, the protection action is carried out, and simultaneously a warning is given to a user, at this time, even if the whole voltage of the battery pack is within a normal range, the protection action is carried out so as to prevent the battery pack from generating problems in advance.
In addition, even if the overall voltage of the battery pack is within a normal range, if some of the unit secondary batteries are abnormal, it is possible to find and take measures in advance, thereby preventing the battery pack from accidents such as explosion or fire in advance.
While the above description has described specific details, limited embodiments and drawings that are the same as specific components, this is for the purpose of facilitating a fuller understanding, and the present invention is not limited to the embodiments described above, and various modifications and variations will become apparent to those skilled in the art.
Therefore, the idea of the present invention is not limited to the illustrated embodiments, and the claims to be described later and all the equivalents or equivalent variations of the claims belong to the scope of the idea of the present invention.

Claims (7)

1. A battery pack protection method is characterized by comprising the steps of observing the voltage change of each unit secondary battery connected in series and parallel in a battery pack one by one; and performing a protection operation when a unit secondary battery belonging to a predetermined abnormal state among the unit secondary batteries is observed.
2. The battery pack protection method according to claim 1, further comprising issuing a warning to a user when a unit secondary battery belonging to the abnormal state is observed.
3. The battery pack protection method according to claim 1, wherein the criterion for judging the abnormal state by the battery pack protection method is judged according to the inclination of the voltage waveform of each of the unit secondary batteries.
4. The battery pack protection method according to claim 3, wherein the abnormal state is determined by determining that a specific unit secondary battery having a voltage waveform with a change in inclination different from that of other unit secondary batteries is in an abnormal state, or determining that a unit secondary battery having a change in inclination greater than a predetermined normal level due to a voltage drop or rise rate is in an abnormal state.
5. A battery pack protection device is characterized by comprising a battery monitoring part for observing voltage changes of unit secondary batteries connected in series and parallel in a battery pack one by one; a processor for setting a condition for determining abnormality of the unit secondary batteries in advance, and determining whether the unit secondary batteries are in an abnormal state one by one based on the observation information of the battery monitoring unit and the set abnormality determination condition; and a protection processing part for executing protection processing action according to the control signal sent by the processor after judging the abnormity.
6. The battery pack protection device according to claim 5, wherein the processor is provided with a warning unit that determines an abnormality and sends a control signal to activate the device, and notifies a user of an abnormal state of the battery pack.
7. The battery pack protection apparatus according to claim 5, wherein the processor determines the abnormal state by comparing the voltage waveforms of the unit secondary batteries with each other in a graph shape according to a change in the inclination of the voltage waveform of each unit secondary battery, or by determining that the unit secondary battery having a voltage drop or a voltage rise rate higher than a normal level is an abnormal state based on a predetermined normal level of the voltage drop or the voltage rise rate.
CN202080074053.1A 2019-11-07 2020-10-29 Battery pack protection method and device Pending CN114600299A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2019-0141611 2019-11-07
KR1020190141611A KR102287250B1 (en) 2019-11-07 2019-11-07 Protecting method for battery pack and apparatus thereof
PCT/KR2020/014863 WO2021091159A1 (en) 2019-11-07 2020-10-29 Method for protecting battery pack and device therefor

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CN114600299A true CN114600299A (en) 2022-06-07

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CN113406515B (en) * 2021-06-18 2022-11-29 东莞新能安科技有限公司 Battery cell detection method and device

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