JP2003197268A - Battery pack having abnormality protection circuit - Google Patents

Battery pack having abnormality protection circuit

Info

Publication number
JP2003197268A
JP2003197268A JP2001398807A JP2001398807A JP2003197268A JP 2003197268 A JP2003197268 A JP 2003197268A JP 2001398807 A JP2001398807 A JP 2001398807A JP 2001398807 A JP2001398807 A JP 2001398807A JP 2003197268 A JP2003197268 A JP 2003197268A
Authority
JP
Japan
Prior art keywords
circuit
abnormal
pressure
temperature
protection circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2001398807A
Other languages
Japanese (ja)
Inventor
Naoki Kaneko
直樹 金子
Original Assignee
Nec Tokin Tochigi Ltd
エヌイーシートーキン栃木株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Tokin Tochigi Ltd, エヌイーシートーキン栃木株式会社 filed Critical Nec Tokin Tochigi Ltd
Priority to JP2001398807A priority Critical patent/JP2003197268A/en
Publication of JP2003197268A publication Critical patent/JP2003197268A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

(57) [Summary] [PROBLEMS] To prevent a situation in which a battery is ruptured or fired by adding a simple configuration even when an overcharge protection function or the like breaks down. SOLUTION: This is a battery pack with an abnormality protection circuit for detecting an abnormal state in a case and stopping charging, a circuit interrupting means 2 connected in series to a charging circuit of a secondary battery 1 and interrupting the charging circuit; Pressure detecting means 3 for detecting abnormal pressure;
Temperature detecting means 4 for detecting an abnormal temperature and pressure detecting means 3
And a protection circuit T for operating the circuit interrupting means 2 to interrupt the charging circuit when abnormal pressure is detected by the temperature detecting means 4 or when abnormal temperature is detected by the temperature detecting means 4. Even if the battery swells due to overcharging and becomes abnormal pressure and temperature, the charging circuit is shut off before the battery ruptures or ignites, thereby preventing rupture or ignition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack with an abnormality protection circuit that detects an abnormal state in a case and stops charging.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing an outline of a circuit configuration of a battery pack, 11 is a secondary battery, 12 is a protection control section, SW1 is a discharge control element, and SW.
Reference numeral 2 represents a charge control element.

Generally, in a battery pack, for example, FIG.
As shown in FIG. 5, the secondary battery 11, the protection function control unit 12, the discharge control element SW1, and the charge control element SW2 are incorporated. The protection control unit 12 has a function of monitoring the terminal voltage of the secondary battery 11 and at least having an overcharge detection function and a function of controlling the charge control element SW2 when overcharge is detected. When the battery 11 is overcharged and the charging voltage becomes abnormally high, the charging control element SW2 is turned off to stop charging.

When the protection control unit 12 fails and the overcharge detection and protection functions do not operate and the secondary battery 11 exceeds the full charge voltage and is exposed to the overcharged state, the secondary battery 11 is exposed. Generates heat and swells due to overvoltage. However, even if such heat generation and swelling occur, it is difficult to visually detect an abnormality in the charging environment or the like by the battery pack alone unless the battery pack extremely swells. As a result, the problem of eventually bursting or igniting is reached.

Further, for example, a device which detects a swelling of a battery and shuts off an electric current has been proposed (Japanese Patent Application Laid-Open No. H10 (1998) -109242).
(See JP-A-214612, JP-A-2000-251942, etc.), and such a conventional one has a high probability of malfunction and has a problem in practical use.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and even when the overcharge protection function or the like fails, a situation in which a battery is ruptured or ignited by the addition of a simple configuration is obviated. It is something to try to prevent.

Therefore, the present invention is a battery pack with an abnormality protection circuit that detects an abnormal state in the case and stops charging, and is a circuit breaker that is connected in series to the charging circuit of the secondary battery and that interrupts the charging circuit. Means, pressure detecting means for detecting an abnormal pressure, temperature detecting means for detecting an abnormal temperature, and the circuit when the abnormal pressure is detected by the pressure detecting means or when the abnormal temperature is detected by the temperature detecting means A protection circuit for activating the interruption means to interrupt the charging circuit is provided.

A fuse is used as the circuit breaking means,
The protection circuit is a circuit that short-circuits the terminals of the secondary battery through the fuse, short-circuits the terminals of the secondary battery on condition that the voltage of the secondary battery is equal to or higher than a predetermined value, and The protection circuit has a delay circuit and operates the circuit breaking means when the detection state of the abnormal pressure or the abnormal temperature continues for a certain period of time, and the pressure detection means,
An abnormal pressure between the secondary battery and a case covering the secondary battery is detected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a battery pack with an abnormality protection circuit according to the present invention, in which 1 is a secondary battery, 2 is a fuse, 3 is a pressure sensor, 4 is a temperature sensor, 5 is an OR logic circuit, and 6 Is a delay circuit, 7 is an AND logic circuit, D is a constant voltage element, T is a switching element, R1,
R2 represents resistance.

In FIG. 1, the fuse 2 is a secondary battery 1
Is a circuit disconnecting means that is connected in series to the charging circuit and disconnects the charging circuit by self-heating when an excessive charging current flows. For example, a Ni tab used for wiring is processed to melt at a constant current. It can also be used. The pressure sensor 3 is a pressure detection unit that is installed between the secondary battery 1 and a case that covers the secondary battery 1 and detects an abnormal pressure that is a certain value or more. The temperature sensor 4 is a secondary battery 1 that has a certain value or more. Is a temperature detecting means for detecting an abnormal temperature of. The OR logic circuit 5 detects an abnormal pressure detection signal from the pressure sensor 3,
An OR process is performed with the detection signal of the abnormal temperature by the temperature sensor 4, and the delay circuit 6 is operated by any of the detection signals.

The constant voltage element D is, for example, a constant voltage diode that determines and detects whether or not the secondary battery 1 is charged to a voltage higher than a certain level. The AND logic circuit 7 performs an AND process on the output signal of the delay circuit 6 and the output signal of the constant voltage element D to control the switching element T to be turned on. 6
The switching element T is controlled to be turned on when the abnormal voltage continues for a certain period of time set in step 1 and when the charging voltage between the terminals of the secondary battery 1 exceeds the operating constant voltage of the constant voltage element D. The switching element T short-circuits the terminals of the secondary battery 1 through the fuse 2, and the resistor R2 is, for example, an FET or other transistor that regulates the short-circuit current.

Next, the operation will be described. As described above, the rechargeable battery pack normally has an overcharge protection function (not shown), but if this overcharge protection function does not work and the overcharge state further progresses, heat generation, Swelling occurs, the temperature inside the battery pack rises, and the pressure rises. As a result, when the pressure exceeds a certain value, the pressure center 3 detects an abnormal pressure, and when the temperature exceeds a certain value, the temperature center 4 detects an abnormal temperature.

When any of these outputs causes the delay circuit 6 to operate through the OR logic circuit 5 and remains in that state for a certain period of time or longer, the secondary battery 1 has a voltage above a certain level defined by the constant voltage element D. Under this condition, the switching element T is turned on through the AND logic circuit 7, and a short circuit current flows from the secondary battery 1 through the fuse 2 and the resistor R2. The fuse 2 is blown by this short-circuit current,
The charging circuit is cut off. The delay circuit 6 and the constant voltage element D are used to determine that a voltage above a certain level is applied to the secondary battery 1, and then only when the pressure or temperature is abnormal for a certain time or more, the switching element T Is turned on to fuse the fuse 2 and supply a current, so that a malfunction can be effectively prevented.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the fuse that blows off by flowing an excessive current is used as the circuit cutoff means that cuts off the charging circuit. The fuse may be blown by, or the charging circuit may be cut off with a bimetal or the like for a certain period of time. Also, if abnormal pressure or temperature is detected and it continues for a certain period of time,
It goes without saying that the circuit including the constant voltage diode, the AND logic circuit, the switching element, and the fuse can be appropriately changed as long as the configuration for cutting off the current can be achieved.

[0015]

As is apparent from the above description, according to the present invention, there is provided a battery pack with an abnormality protection circuit for detecting an abnormal state in a case and stopping charging, which is used in a charging circuit for a secondary battery. Circuit interrupting means connected in series to interrupt the charging circuit, pressure detecting means for detecting abnormal pressure, temperature detecting means for detecting abnormal temperature, and when abnormal pressure is detected by the pressure detecting means or by the temperature detecting means. When the abnormal temperature is detected, the circuit breaker is activated to shut off the charging circuit, so the secondary battery receives a certain voltage or more, and overcharging causes the battery to swell, causing abnormal pressure and abnormal temperature. However, the charging circuit can be shut off before the battery bursts or catches fire to prevent the battery from bursting or catching fire.

A fuse is used as the circuit breaking means, and the protection circuit is a circuit for short-circuiting the terminals of the secondary battery through the fuse, and the terminal of the secondary battery is provided on condition that the voltage of the secondary battery is equal to or higher than a predetermined value. The protection circuit has a delay circuit and operates the circuit interruption means when the abnormal pressure or abnormal temperature detection state continues for a certain period of time, and the pressure detection means operates the secondary battery and the secondary battery. Since the abnormal pressure between the cases that cover the battery is detected, if the battery swells or heats up due to overcharging, etc. and the abnormal condition continues, the current can be cut off reliably to prevent malfunction. The safety and reliability of can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a battery pack with an abnormality protection circuit according to the present invention.

FIG. 2 is a diagram showing a schematic circuit configuration of a battery pack.

[Explanation of symbols]

1 ... Secondary battery, 2 ... Fuse, 3 ... Pressure sensor, 4 ... Temperature sensor, 5 ... OR logic circuit, 6 ... Delay circuit, 7 ... AND logic circuit, D ... Constant voltage element, T ... Switching element,
R1, R2 ... Resistance

Claims (5)

[Claims]
1. A battery pack with an abnormality protection circuit for detecting an abnormal state in a case to stop charging, the circuit pack being connected in series to a charging circuit of a secondary battery and for interrupting the charging circuit, and an abnormality. Pressure detecting means for detecting pressure, temperature detecting means for detecting abnormal temperature, and operating the circuit breaking means when abnormal pressure is detected by the pressure detecting means or when abnormal temperature is detected by the temperature detecting means A battery pack with an abnormality protection circuit, comprising: a protection circuit that shuts off the charging circuit.
2. The battery with an abnormality protection circuit according to claim 1, wherein a fuse is used as the circuit breaking means, and the protection circuit is a circuit that short-circuits the terminals of the secondary battery through the fuse. pack.
3. The abnormal protection circuit according to claim 2, wherein the protection circuit short-circuits the terminals of the secondary battery on condition that the voltage of the secondary battery is equal to or higher than a predetermined value. Battery pack.
4. The abnormal protection circuit according to claim 1, wherein the protection circuit has a delay circuit and operates the circuit breaking means when the detection state of the abnormal pressure or the abnormal temperature continues for a certain period of time. Battery pack with.
5. The battery pack with an abnormality protection circuit according to claim 1, wherein the pressure detecting means detects an abnormal pressure between the secondary battery and a case covering the secondary battery.
JP2001398807A 2001-12-28 2001-12-28 Battery pack having abnormality protection circuit Withdrawn JP2003197268A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001398807A JP2003197268A (en) 2001-12-28 2001-12-28 Battery pack having abnormality protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001398807A JP2003197268A (en) 2001-12-28 2001-12-28 Battery pack having abnormality protection circuit

Publications (1)

Publication Number Publication Date
JP2003197268A true JP2003197268A (en) 2003-07-11

Family

ID=27604092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001398807A Withdrawn JP2003197268A (en) 2001-12-28 2001-12-28 Battery pack having abnormality protection circuit

Country Status (1)

Country Link
JP (1) JP2003197268A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007095498A (en) * 2005-09-29 2007-04-12 Densei Lambda Kk Safety system of battery pack
JP2007173223A (en) * 2005-11-28 2007-07-05 Nec Tokin Corp Battery lamination body and battery pack
JP2007250545A (en) * 2006-03-13 2007-09-27 Lg Chem Ltd Battery module having simple-structure safety means
US7719237B2 (en) 2004-10-13 2010-05-18 Lg Electronics Inc. Wireless communication terminal and battery pack for the same
JP2013171834A (en) * 2012-02-22 2013-09-02 Autoliv Development Ab Battery pack for vehicle
JP2014512089A (en) * 2011-05-17 2014-05-19 エルジー ケム. エルティーディ. Battery pack with improved safety
CN103931025A (en) * 2012-01-26 2014-07-16 株式会社Lg化学 Battery pack having improved safety
JP2015528989A (en) * 2012-07-25 2015-10-01 フォルクスヴァーゲン ヴァルタ マイクロバッテリー フォルシュングスゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Battery with thermal switch
JP2016072011A (en) * 2014-09-29 2016-05-09 株式会社東芝 Battery pack

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7719237B2 (en) 2004-10-13 2010-05-18 Lg Electronics Inc. Wireless communication terminal and battery pack for the same
JP2007095498A (en) * 2005-09-29 2007-04-12 Densei Lambda Kk Safety system of battery pack
JP2007173223A (en) * 2005-11-28 2007-07-05 Nec Tokin Corp Battery lamination body and battery pack
JP2007250545A (en) * 2006-03-13 2007-09-27 Lg Chem Ltd Battery module having simple-structure safety means
JP4689634B2 (en) * 2006-03-13 2011-05-25 エルジー・ケム・リミテッド Battery module with simple structure safety means
US9761911B2 (en) 2011-05-17 2017-09-12 Lg Chem, Ltd. Battery pack of improved safety
JP2014512089A (en) * 2011-05-17 2014-05-19 エルジー ケム. エルティーディ. Battery pack with improved safety
CN103931025A (en) * 2012-01-26 2014-07-16 株式会社Lg化学 Battery pack having improved safety
JP2014533424A (en) * 2012-01-26 2014-12-11 エルジー・ケム・リミテッド Battery pack with improved safety
US9768473B2 (en) 2012-01-26 2017-09-19 Lg Chem, Ltd. Battery pack of improved safety
JP2013171834A (en) * 2012-02-22 2013-09-02 Autoliv Development Ab Battery pack for vehicle
JP2015528989A (en) * 2012-07-25 2015-10-01 フォルクスヴァーゲン ヴァルタ マイクロバッテリー フォルシュングスゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Battery with thermal switch
JP2016072011A (en) * 2014-09-29 2016-05-09 株式会社東芝 Battery pack

Similar Documents

Publication Publication Date Title
US6531847B1 (en) Safety method, device and system for an energy storage device
EP0222381B1 (en) Charging device
JP3338564B2 (en) Battery pack and device using battery pack
US5119009A (en) Lithium battery deactivator
JP3825387B2 (en) Secondary battery with protection circuit
DE19737775C2 (en) Device for protecting at least one rechargeable battery cell against overcharging
DE10103336C1 (en) Charge / discharge protection circuit for a rechargeable battery
KR101128423B1 (en) Safety switch of secondary battery for electric vehicle, charge and discharge system of secondary battery for electric vehicle using there
TWI538343B (en) Charge and discharge control devices, battery packs, electrical equipment, and charge and discharge control methods
US5156928A (en) Protective apparatus and method for a fuel cell
US5853908A (en) Protective device for secondary batteries
KR100929036B1 (en) Protection circuit of battery pack, battery pack having same and operation method thereof
KR100777884B1 (en) A charge/discharge control circuit and a charging-type power-supply unit
DE60031613T2 (en) Battery pack
JP3212963B2 (en) Secondary battery control circuit
DE102009053712B4 (en) Battery system that detects excessive current and interrupts current flow with a fuse and relay
EP1600337B1 (en) Electronic circuit breaker for battery
US6531846B1 (en) Final discharge of a cell activated by a circuit that senses when a charging fault has occurred
JP5209122B2 (en) Apparatus and method for protecting battery pack by sensing destruction of sense resistor
US5856738A (en) Method for protecting an excess discharge of a battery
US5144517A (en) Intrinsically safe barrier device
EP0757177B1 (en) Ignition system of internal combustion engine
WO2011013384A1 (en) Protection circuit, battery pack, and charging system
EP2448081B1 (en) Battery pack overcharge protection system
US4670703A (en) Battery charger with three different charging rates

Legal Events

Date Code Title Description
A621 Written request for application examination

Effective date: 20040524

Free format text: JAPANESE INTERMEDIATE CODE: A621

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20051125

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20051221

A761 Written withdrawal of application

Effective date: 20060124

Free format text: JAPANESE INTERMEDIATE CODE: A761