JP2016082642A - Overcurrent abnormality detection device and overcurrent abnormality detection method - Google Patents

Overcurrent abnormality detection device and overcurrent abnormality detection method Download PDF

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JP2016082642A
JP2016082642A JP2014209869A JP2014209869A JP2016082642A JP 2016082642 A JP2016082642 A JP 2016082642A JP 2014209869 A JP2014209869 A JP 2014209869A JP 2014209869 A JP2014209869 A JP 2014209869A JP 2016082642 A JP2016082642 A JP 2016082642A
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battery
overcurrent abnormality
current
temperature
detection unit
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皓子 安谷屋
Hiroko Ataya
皓子 安谷屋
隆広 都竹
Takahiro Tsutake
隆広 都竹
博之 野村
Hiroyuki Nomura
博之 野村
隆介 長谷
Ryusuke Hase
隆介 長谷
順一 波多野
Junichi Hatano
順一 波多野
量也 山田
Kazuya Yamada
量也 山田
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Toyota Industries Corp
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Toyota Industries Corp
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To appropriately detect an overcurrent abnormality produced in a battery, when a current not to be desired to make electric conduction in the battery is different depending on battery charge/discharge and a temperature.SOLUTION: An overcurrent abnormality detection device 1 includes: a current detection unit 9 which detects a current flowing through a battery 2; a temperature detection unit 10 which detects the temperature of the battery 2; a threshold setting unit 121 which sets a threshold Ith according to a temperature detected by the temperature detection unit 10 while the battery 2 is being charged or according to a temperature detected by the temperature detection unit 10 while the battery 2 is being discharged; and an overcurrent abnormality detection unit 122 which detects the occurrence of the overcurrent abnormality in the battery 2 when the current, detected by the current detection unit 9, becomes the threshold Ith or larger.SELECTED DRAWING: Figure 1

Description

本発明は、電池に発生する過電流異常の検出技術に関する。   The present invention relates to a technique for detecting an overcurrent abnormality occurring in a battery.

電池の充電中と放電中とで電池に通電させたくない電流（過電流）が異なる。また、電池の温度によって電池に通電させたくない電流が異なる。
このように、複数の要因によって電池に通電させたくない電流が異なる場合でも、電池に発生する過電流異常を適切に検出して、通電させたくない電流が電池に流れないようにすることが望まれている。 The current (overcurrent) that the battery does not want to be energized is different between charging and discharging the battery. Moreover, the electric current which it is not desired to energize a battery changes with battery temperatures.
In this way, even when the current that the battery does not want to be energized differs due to multiple factors, it is desirable to properly detect the overcurrent abnormality that occurs in the battery so that the current that does not want to be energized does not flow to the battery. It is rare.

また、互いに並列接続される複数の電池が搭載される車両の走行中において、過電流異常が発生した電池を切り離して残りの電池を使用して車両を外部充電器の設置場所まで走行させる場合、残りの電池の容量が少ないと、車両を外部充電器の設置場所まで走行させることができないおそれがある。   Also, when running a vehicle equipped with a plurality of batteries connected in parallel to each other, disconnect the battery in which the overcurrent abnormality occurred and use the remaining battery to run the vehicle to the installation location of the external charger. If the remaining battery capacity is low, the vehicle may not be able to travel to the location where the external charger is installed.

関連する技術として、例えば、電池の温度に応じて電池に過電流異常が発生しているか否かを判断するための閾値を変えるものがある。例えば、特許文献１参照。   As a related technique, for example, there is one that changes a threshold value for determining whether or not an overcurrent abnormality has occurred in a battery according to the temperature of the battery. For example, see Patent Document 1.

特表２００７−５２０１８０号公報Special table 2007-520180 gazette

本発明は、電池の充放電や温度によって電池に通電させたくない電流が異なる場合でも、電池に発生する過電流異常を適切に検出することが可能な過電流異常検出装置及び過電流異常検出方法を提供することを目的とする。   The present invention relates to an overcurrent abnormality detection device and an overcurrent abnormality detection method capable of appropriately detecting an overcurrent abnormality that occurs in a battery even when the current that is not desired to be supplied to the battery varies depending on the charge / discharge and temperature of the battery. The purpose is to provide.

また、本発明は、車両の走行中において、過電流異常が発生した電池を切り離して残りの電池を使用して車両を外部充電器の設置場所まで走行させる場合、車両をできるだけ長い時間走行させることが可能な過電流異常検出装置及び過電流異常検出方法を提供することを目的とする。   In addition, the present invention enables the vehicle to travel for as long a time as possible when the vehicle is traveling to the place where the external charger is installed using the remaining battery after disconnecting the battery in which the overcurrent abnormality has occurred. It is an object of the present invention to provide an overcurrent abnormality detection device and an overcurrent abnormality detection method capable of performing the above.

実施形態の過電流異常検出装置は、電池の温度を検出する温度検出部と、電池の充電中に温度検出部により検出される温度に応じて、又は、電池の放電中に温度検出部により検出される温度に応じて、閾値を設定する閾値設定部と、電池に流れる電流を検出する電流検出部と、電流検出部により検出される電流が閾値以上になると、電池に過電流異常が発生していることを検出する過電流異常検出部とを備える。   The overcurrent abnormality detection device of the embodiment is detected by a temperature detection unit that detects the temperature of the battery, and by the temperature detection unit according to the temperature detected by the temperature detection unit during charging of the battery, or during discharge of the battery An overcurrent abnormality occurs in the battery when the threshold value setting unit for setting the threshold value, the current detection unit for detecting the current flowing through the battery, and the current detected by the current detection unit are equal to or greater than the threshold value. And an overcurrent abnormality detection unit for detecting that the

また、実施形態の過電流異常検出装置は、電池が搭載される車両の走行時、電池の充電時に比べて、閾値を小さくする閾値設定部と、電池に流れる電流を検出する電流検出部と、電流検出部により検出される電流が閾値以上になると、電池に過電流異常が発生していることを検出する過電流異常検出部とを備える。   In addition, the overcurrent abnormality detection device of the embodiment includes a threshold setting unit that reduces the threshold when traveling a vehicle equipped with a battery, and a current detection unit that detects a current flowing through the battery, And an overcurrent abnormality detection unit that detects that an overcurrent abnormality has occurred in the battery when the current detected by the current detection unit exceeds a threshold value.

また、実施形態の過電流異常検出方法は、電池に発生する過電流異常を検出する過電流異常検出装置が、電池の温度を検出し、電池の充電中に検出される温度に応じて、又は、電池の放電中に検出される温度に応じて、閾値を設定し、電池に流れる電流を検出し、その検出した電流が閾値以上になると、電池に過電流異常が発生していることを検出する。   Further, according to the overcurrent abnormality detection method of the embodiment, the overcurrent abnormality detection device that detects the overcurrent abnormality that occurs in the battery detects the temperature of the battery, or depending on the temperature detected during charging of the battery, or The threshold is set according to the temperature detected during battery discharge, the current flowing through the battery is detected, and when the detected current exceeds the threshold, it is detected that an overcurrent abnormality has occurred in the battery. To do.

また、実施形態の過電流異常検出方法は、電池に発生する過電流異常を検出する過電流異常検出装置が、電池が搭載される車両の走行時、電池の充電時に比べて、閾値を小さくし、電池に流れる電流を検出し、その検出した電流が閾値以上になると、電池に過電流異常が発生していることを検出する。   Also, the overcurrent abnormality detection method of the embodiment is such that the overcurrent abnormality detection device that detects an overcurrent abnormality that occurs in the battery reduces the threshold value when the vehicle on which the battery is mounted is traveling, compared to when the battery is charged. The current flowing through the battery is detected, and when the detected current exceeds a threshold value, it is detected that an overcurrent abnormality has occurred in the battery.

本発明は、電池の充放電や温度によって電池に通電させたくない電流が異なる場合でも、電池に発生する過電流異常を適切に検出することができる。
また、本発明は、車両の走行時において、過電流異常が発生した電池を切り離して残りの電池を使用して車両を外部充電器の設置場所まで走行させる場合、車両をできるだけ長い時間走行させることができる。 The present invention can appropriately detect an overcurrent abnormality that occurs in a battery even when the current that is not desired to be passed through the battery varies depending on the charge / discharge and temperature of the battery.
In addition, the present invention enables the vehicle to travel for as long a time as possible when the vehicle is traveling to the place where the external charger is installed using the remaining battery after disconnecting the battery in which the overcurrent abnormality has occurred. Can do.

実施形態の過電流異常検出装置の一例を示す図である。It is a figure which shows an example of the overcurrent abnormality detection apparatus of embodiment. 制御部の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of a control part. 図２に示すＳ２２の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of S22 shown in FIG. 充電用の温度−閾値対応情報及び放電用の温度−閾値対応情報の一例を示す図である。It is a figure which shows an example of the temperature-threshold corresponding | compatible information for charge, and the temperature-threshold corresponding | compatible information for discharge. 制御部の他の動作の一例を示すフローチャートである。It is a flowchart which shows an example of other operation | movement of a control part. 図５に示すＳ５２の動作の一例を示すフローチャートである。6 is a flowchart illustrating an example of an operation of S52 illustrated in FIG.

図１は、実施形態の過電流異常検出装置の一例を示す図である。
図１に示す過電流異常検出装置１は、例えば、電動フォークリフトやプラグインハイブリッド車などの車両に搭載され、互いに並列接続される複数の電池２（２−１〜２−ｎ）に過電流異常（電池２に通電させたくない電流が流れてしまう異常）が発生したことを検出する。各電池２は、それぞれ、直列接続される複数の二次電池（例えば、リチウムイオン電池）により構成されている。なお、各電池２は、それぞれ、一つの二次電池により構成されてもよい。 FIG. 1 is a diagram illustrating an example of an overcurrent abnormality detection device according to an embodiment.
An overcurrent abnormality detection device 1 shown in FIG. 1 is mounted on a vehicle such as an electric forklift or a plug-in hybrid vehicle, and overcurrent abnormality occurs in a plurality of batteries 2 (2-1 to 2-n) connected in parallel to each other. It detects that (abnormality in which a current that does not want to energize the battery 2 flows) has occurred. Each battery 2 is composed of a plurality of secondary batteries (for example, lithium ion batteries) connected in series. Each battery 2 may be constituted by one secondary battery.

各電池２の充電時、車両の外部に設けられる外部充電器３は、車両に設けられる充電制御部４から送信される電流指令値Ｉｃ１に応じた電力を車両に供給し、車両に設けられる内部充電器５は、外部充電器３から供給される電力を各電池２に供給し、各電池２を充電する。   When each battery 2 is charged, an external charger 3 provided outside the vehicle supplies the vehicle with electric power corresponding to a current command value Ic1 transmitted from a charge control unit 4 provided in the vehicle, and is provided in the vehicle. The charger 5 supplies the electric power supplied from the external charger 3 to each battery 2 and charges each battery 2.

車両の走行時、車両に設けられる電力変換部６は、走行用モータ７が電力を消費する場合、各電池２から供給される直流電力を、走行制御部８から送られてくる電流指令値Ｉｃ２に応じた交流電力に変換して走行用モータ７に供給する。また、車両の走行時、電力変換部６は、走行用モータ７において回生電力が発生する場合、その回生電力を、電流指令値Ｉｃ２に応じた直流電力に変換して各電池２に供給し、各電池２を充電する。   When the vehicle travels, the power conversion unit 6 provided in the vehicle uses the current command value Ic2 sent from the travel control unit 8 to the DC power supplied from each battery 2 when the travel motor 7 consumes power. Is converted into alternating current power according to the above and supplied to the traveling motor 7. Further, when the vehicle travels, the power conversion unit 6 converts the regenerative power into DC power corresponding to the current command value Ic2 and supplies it to each battery 2 when regenerative power is generated in the traveling motor 7. Each battery 2 is charged.

過電流異常検出装置１は、各電池２にそれぞれ対応する電流検出部９（９−１〜９−ｎ）と、各電池２にそれぞれ対応する温度検出部１０（１０−１〜１０−ｎ）と、各電池２にそれぞれ対応するスイッチ１１（１１−１〜１１−ｎ）と、制御部１２と、記憶部１３とを備える。例えば、電流検出部９は電流センサを有し、温度検出部１０は温度センサを有する。スイッチ１１はトランジスタなどの半導体スイッチや機械式リレーなどにより構成される。制御部１２はＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ、プログラマブルなデバイス（ＦＰＧＡ（Field Programmable Gate Array）やＰＬＤ（Programmable Logic Device）など）により構成される。記憶部１３は、ＲＡＭ（Random Access Memory）やＲＯＭ（Read Only Memory）などにより構成される。   The overcurrent abnormality detection device 1 includes a current detector 9 (9-1 to 9-n) corresponding to each battery 2 and a temperature detector 10 (10-1 to 10-n) corresponding to each battery 2. And a switch 11 (11-1 to 11-n) corresponding to each battery 2, a control unit 12, and a storage unit 13. For example, the current detection unit 9 includes a current sensor, and the temperature detection unit 10 includes a temperature sensor. The switch 11 includes a semiconductor switch such as a transistor, a mechanical relay, or the like. The control unit 12 includes a CPU (Central Processing Unit), a multi-core CPU, and programmable devices (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), etc.). The storage unit 13 includes a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.

電流検出部９−１は電池２−１に流れる電流Ｉ１を検出する。また、電流検出部９−ｎは電池２−ｎに流れる電流Ｉｎを検出する。
温度検出部１０−１は電池２−１の温度Ｔ１を検出する。また、温度検出部１０−ｎは電池２−ｎの温度Ｔｎを検出する。 The current detector 9-1 detects a current I1 flowing through the battery 2-1. Further, the current detection unit 9-n detects a current In flowing through the battery 2-n.
The temperature detector 10-1 detects the temperature T1 of the battery 2-1. Further, the temperature detection unit 10-n detects the temperature Tn of the battery 2-n.

スイッチ１１−１は各電池２の接続点と電池２−１との間に設けられ、スイッチ１１−１がオンすると、電池２−１が他の電池２と電気的に接続され、スイッチ１１−１がオフすると、電池２−１が他の電池２から電気的に切り離される。また、スイッチ１１−ｎは各電池２の接続点と電池２−ｎとの間に設けられ、スイッチ１１−ｎがオンすると、電池２−ｎが他の電池２と電気的に接続され、スイッチ１１−ｎがオフすると、電池２−ｎが他の電池２から電気的に切り離される。   The switch 11-1 is provided between the connection point of each battery 2 and the battery 2-1. When the switch 11-1 is turned on, the battery 2-1 is electrically connected to the other battery 2, and the switch 11- When 1 is turned off, the battery 2-1 is electrically disconnected from the other batteries 2. The switch 11-n is provided between the connection point of each battery 2 and the battery 2-n. When the switch 11-n is turned on, the battery 2-n is electrically connected to the other battery 2, and the switch 11-n When 11-n is turned off, the battery 2-n is electrically disconnected from the other batteries 2.

制御部１２は、閾値設定部１２１と、過電流異常検出部１２２と、スイッチ制御部１２３とを備える。閾値設定部１２１、過電流異常検出部１２２、及びスイッチ制御部１２３は、例えば、ＣＰＵなどが記憶部１３に記憶されているプログラムを読み出し実行することによって実現される。   The control unit 12 includes a threshold setting unit 121, an overcurrent abnormality detection unit 122, and a switch control unit 123. The threshold setting unit 121, the overcurrent abnormality detection unit 122, and the switch control unit 123 are realized by, for example, a CPU or the like reading and executing a program stored in the storage unit 13.

閾値設定部１２１は、充電制御部４から送られてくる充放電状態情報や走行制御部８から送られてくる走行状態情報などに基づいて、電池２−１〜２−ｎに対応する閾値Ｉｔｈ１〜Ｉｔｈｎを設定する。充放電状態情報は、電池２−１〜２−ｎが充電中又は放電中であることを示している。走行状態情報は、車両が走行中であるか否かを示している。   The threshold value setting unit 121 is based on the charge / discharge state information sent from the charge control unit 4, the running state information sent from the traveling control unit 8, and the like, and the threshold value Ith1 corresponding to the batteries 2-1 to 2 -n. Set ~ Ithn. The charge / discharge state information indicates that the batteries 2-1 to 2-n are being charged or discharged. The traveling state information indicates whether or not the vehicle is traveling.

過電流異常検出部１２２は、電流検出部９−１により検出される電流Ｉ１が閾値Ｉｔｈ１以上になると、電池２−１に過電流異常が発生していることを検出する。また、過電流異常検出部１２２は、電流検出部９−ｎにより検出される電流Ｉｎが閾値Ｉｔｈｎ以上になると、電池２−ｎに過電流異常が発生していることを検出する。   The overcurrent abnormality detection unit 122 detects that an overcurrent abnormality has occurred in the battery 2-1, when the current I1 detected by the current detection unit 9-1 is equal to or greater than the threshold value Ith1. The overcurrent abnormality detection unit 122 detects that an overcurrent abnormality has occurred in the battery 2-n when the current In detected by the current detection unit 9-n becomes equal to or greater than the threshold value Ithn.

スイッチ制御部１２３は、過電流異常検出部１２２により電池２−１に過電流異常が発生していることが検出されると、スイッチ１１−１をオフさせて、電池２−１を他の電池２から電気的に切り離す。また、スイッチ制御部１２３は、過電流異常検出部１２２により電池２−ｎに過電流異常が発生していることが検出されると、スイッチ１１−ｎをオフさせて、電池２−ｎを他の電池２から電気的に切り離す。   When the overcurrent abnormality detection unit 122 detects that an overcurrent abnormality has occurred in the battery 2-1, the switch control unit 123 turns off the switch 11-1 to connect the battery 2-1 to another battery. Electrically disconnected from 2. In addition, when the overcurrent abnormality detection unit 122 detects that an overcurrent abnormality has occurred in the battery 2-n, the switch control unit 123 turns off the switch 11-n and removes the battery 2-n. The battery 2 is electrically disconnected.

図２は、制御部１２の動作の一例を示すフローチャートである。なお、図２に示す動作は、一定時間経過毎に行われるものとする。
まず、閾値設定部１２１は、温度検出部１０により検出される温度Ｔを取得する（Ｓ２１）。 FIG. 2 is a flowchart illustrating an example of the operation of the control unit 12. Note that the operation shown in FIG. 2 is performed every elapse of a predetermined time.
First, the threshold setting unit 121 acquires the temperature T detected by the temperature detection unit 10 (S21).

次に、閾値設定部１２１は、電池２の充電中に温度検出部１０により検出される温度Ｔに応じて閾値Ｉｔｈを設定する、又は、電池２の放電中に温度検出部１０により検出される温度Ｔに応じて閾値Ｉｔｈを設定する（Ｓ２２）。   Next, the threshold value setting unit 121 sets the threshold value Ith according to the temperature T detected by the temperature detection unit 10 during charging of the battery 2, or is detected by the temperature detection unit 10 during discharge of the battery 2. A threshold value Ith is set according to the temperature T (S22).

次に、過電流異常検出部１２２は、電流検出部９により検出される電流Ｉを取得し（Ｓ２３）、その電流Ｉが閾値Ｉｔｈ以上であると判断すると（Ｓ２４：Ｙｅｓ）、その電流Ｉに対応する電池２に過電流異常が発生していることを検出する（Ｓ２５）。   Next, the overcurrent abnormality detection unit 122 acquires the current I detected by the current detection unit 9 (S23), and determines that the current I is equal to or greater than the threshold Ith (S24: Yes), the current I It is detected that an overcurrent abnormality has occurred in the corresponding battery 2 (S25).

また、過電流異常検出部１２２は、電流Ｉ１が閾値Ｉｔｈよりも小さいと判断すると（Ｓ２４：Ｎｏ）、過電流異常検出処理を終了する。
図３は、図２に示すＳ２２の動作の一例を示すフローチャートである。 When the overcurrent abnormality detection unit 122 determines that the current I1 is smaller than the threshold value Ith (S24: No), the overcurrent abnormality detection process ends.
FIG. 3 is a flowchart showing an example of the operation of S22 shown in FIG.

まず、閾値設定部１２１は、充放電状態情報を取得し（Ｓ３１）、その充放電状態情報に基づいて、電池２が充電中であるか否かを判断する（Ｓ３２）。
次に、閾値設定部１２１は、電池２が充電中であると判断すると（Ｓ３２：Ｙｅｓ）、記憶部１３に記憶されている充電用の温度−閾値対応情報を参照して、図２のＳ２１で取得した温度Ｔに対応する閾値を取得し閾値Ｉｔｈとして設定する（Ｓ３３）。 First, the threshold setting unit 121 acquires charge / discharge state information (S31), and determines whether the battery 2 is being charged based on the charge / discharge state information (S32).
Next, when the threshold setting unit 121 determines that the battery 2 is being charged (S32: Yes), the threshold setting unit 121 refers to the charging temperature-threshold correspondence information stored in the storage unit 13 and performs S21 of FIG. The threshold value corresponding to the temperature T acquired in (1) is acquired and set as the threshold value Ith (S33).

例えば、電池２−１の充電中、温度Ｔ１が４０℃である場合、閾値設定部１２１は、図４（ａ）に示す充電用の温度−閾値対応情報を参照して、４０℃に対応する１００Ａを閾値Ｉｔｈ１として設定する。なお、図４（ａ）に示す各閾値は、電池２の温度が高くなるに従って小さい値に設定されているとともに、電池２に通電させたくない電流に応じた値に設定されているものとする。   For example, when the temperature T1 is 40 ° C. during charging of the battery 2-1, the threshold setting unit 121 corresponds to 40 ° C. with reference to the temperature-threshold correspondence information for charging shown in FIG. 100A is set as the threshold value Ith1. Each threshold value shown in FIG. 4A is set to a smaller value as the temperature of the battery 2 becomes higher, and is set to a value corresponding to a current that the battery 2 is not desired to be energized. .

また、閾値設定部１２１は、電池２が充電中でないと判断すると（Ｓ３２：Ｎｏ）、電池２が放電中であると判断し、放電用の温度−閾値対応情報を参照して、図２のＳ２１で取得した温度Ｔに対応する閾値を閾値Ｉｔｈとして設定する（Ｓ３４）。   Further, when the threshold value setting unit 121 determines that the battery 2 is not being charged (S32: No), the threshold value setting unit 121 determines that the battery 2 is being discharged, and refers to the discharge temperature-threshold correspondence information as illustrated in FIG. The threshold value corresponding to the temperature T acquired in S21 is set as the threshold value Ith (S34).

例えば、電池２−１の放電中、温度Ｔ１が４０℃である場合、閾値設定部１２１は、図４（ｂ）に示す放電用の温度−閾値対応情報を参照して、４０℃に対応する１２０Ａを閾値Ｉｔｈ１として設定する。なお、図４（ｂ）に示す各閾値は、電池２の温度が高くなるに従って小さい値に設定されているとともに、電池２に通電させたくない電流に応じた値に設定されているものとする。また、図４（ｂ）に示す各閾値は、図４（ａ）の同じ温度に対応する閾値に比べて、大きい値に設定されているものとする。   For example, when the temperature T1 is 40 ° C. during the discharge of the battery 2-1, the threshold setting unit 121 corresponds to 40 ° C. with reference to the temperature-threshold correspondence information for discharge shown in FIG. 120A is set as the threshold value Ith1. Each threshold value shown in FIG. 4B is set to a smaller value as the temperature of the battery 2 increases, and is set to a value corresponding to a current that the battery 2 is not desired to be energized. . Moreover, each threshold value shown in FIG.4 (b) shall be set to a larger value compared with the threshold value corresponding to the same temperature of Fig.4 (a).

このように、閾値Ｉｔｈを電池２の充放電や温度に応じた適切な値に設定することにより、電池２に発生する過電流異常を適切に検出することができる。すなわち、電池２の充放電や温度によって電池２に通電させたくない電流が異なる場合でも、電池２に発生する過電流異常を適切に検出することができる。これにより、過電流異常が発生した電池２を電気的に切り離すことで、通電させたくない電流が電池２や電池２に接続される部品（電線など）に流れないようにすることができる。   Thus, by setting the threshold value Ith to an appropriate value according to the charge / discharge of the battery 2 and the temperature, an overcurrent abnormality occurring in the battery 2 can be appropriately detected. That is, even when the current that is not desired to be passed through the battery 2 varies depending on the charge / discharge and temperature of the battery 2, an overcurrent abnormality occurring in the battery 2 can be detected appropriately. Thereby, by electrically disconnecting the battery 2 in which the overcurrent abnormality has occurred, it is possible to prevent a current that is not desired to be supplied from flowing to the battery 2 or a component (such as an electric wire) connected to the battery 2.

なお、車両に電池２−１が一つのみ備えられる場合、過電流異常検出装置１は電流検出部９−１、温度検出部１０−１、スイッチ１１−１をそれぞれ一つのみ備え、閾値設定部１２１は閾値Ｉｔｈ１のみを設定し、過電流異常検出部１２２は電池２−１のみに対して過電流異常が発生していることを検出する。   When the vehicle includes only one battery 2-1, the overcurrent abnormality detection device 1 includes only one current detection unit 9-1, a temperature detection unit 10-1, and a switch 11-1, and sets a threshold value. The unit 121 sets only the threshold value Ith1, and the overcurrent abnormality detection unit 122 detects that an overcurrent abnormality has occurred only in the battery 2-1.

図５は、制御部１２の他の動作の一例を示すフローチャートである。なお、図５に示す動作は、一定時間経過毎に行われるものとする。
まず、閾値設定部１２１は、走行状態情報を取得し（Ｓ５１）、その走行状態情報に基づいて、車両の走行時であること又は電池２が充電時であることを判断し、車両の走行時であるときの閾値Ｉｔｈを設定する、又は、電池２が充電時であるときの閾値Ｉｔｈを設定する（Ｓ５２）。 FIG. 5 is a flowchart illustrating an example of another operation of the control unit 12. Note that the operation shown in FIG. 5 is performed every elapse of a predetermined time.
First, the threshold value setting unit 121 acquires travel state information (S51), and based on the travel state information, determines that the vehicle is traveling or the battery 2 is charged, and the vehicle travels. Is set, or the threshold value Ith is set when the battery 2 is being charged (S52).

次に、過電流異常検出部１２２は、電流検出部９により検出される電流Ｉを取得し（Ｓ５３）、電流Ｉが閾値Ｉｔｈ以上であると判断すると（Ｓ５４：Ｙｅｓ）、その電流Ｉに対応する電池２に過電流異常が発生していることを検出し（Ｓ５５）、その電池２を他の電池２から電気的に切り離す（Ｓ５６）。   Next, the overcurrent abnormality detection unit 122 acquires the current I detected by the current detection unit 9 (S53), and determines that the current I is equal to or greater than the threshold value Ith (S54: Yes), corresponds to the current I. It is detected that an overcurrent abnormality has occurred in the battery 2 to be operated (S55), and the battery 2 is electrically disconnected from the other batteries 2 (S56).

また、過電流異常検出部１２２は、電流Ｉが閾値Ｉｔｈよりも小さいと判断すると（Ｓ５４：Ｎｏ）、過電流異常検出処理を終了する。
図６は、図５に示すＳ５２の動作の一例を示すフローチャートである。 If the overcurrent abnormality detection unit 122 determines that the current I is smaller than the threshold value Ith (S54: No), the overcurrent abnormality detection process ends.
FIG. 6 is a flowchart showing an example of the operation of S52 shown in FIG.

まず、閾値設定部１２１は、図５のＳ５１で取得した走行状態情報に基づいて、車両が走行時であるか否かを判断する（Ｓ６１）。
閾値設定部１２１は、車両が走行時でないと判断すると（Ｓ６１：Ｎｏ）、電池２が充電時であると判断し、予め決められている閾値Ｉｔｈを記憶部１３から取得する（Ｓ６２）。 First, the threshold setting unit 121 determines whether or not the vehicle is traveling based on the traveling state information acquired in S51 of FIG. 5 (S61).
If the threshold value setting unit 121 determines that the vehicle is not traveling (S61: No), the threshold value setting unit 121 determines that the battery 2 is being charged, and acquires a predetermined threshold value Ith from the storage unit 13 (S62).

また、閾値設定部１２１は、車両が走行時であると判断すると（Ｓ６１：Ｙｅｓ）、予め決められている閾値Ｉｔｈを記憶部１３から取得し、電池２が充電時であるときに使用される閾値Ｉｔｈに比べて、その取得した閾値Ｉｔｈを小さくする（Ｓ６３）。   Further, when the threshold setting unit 121 determines that the vehicle is traveling (S61: Yes), the threshold setting unit 121 acquires a predetermined threshold Ith from the storage unit 13, and is used when the battery 2 is being charged. The acquired threshold value Ith is made smaller than the threshold value Ith (S63).

このように、車両の走行時の閾値Ｉｔｈを、電池２の充電時に比べて、小さくすることにより、例えば、車両の走行時に電池２−１に過電流異常が発生して電池２−１を切り離したときの残りの電池２の容量を、電池２の充電時に電池２−１に過電流異常が発生して電池２−１を切り離したときの残りの電池２の容量よりも大きくすることができる。これにより、車両の走行時に電池２−１に過電流異常が発生する場合、電池２の充電時に電池２−１に過電流異常が発生する場合に比べて、車両を長い時間走行させることができる。すなわち、車両の走行時において、過電流異常が発生した電池２を切り離して残りの電池２を使用して車両を外部充電器３の設置場所まで走行させる場合、車両をできるだけ長い時間走行させることができる。   Thus, by making the threshold value Ith when the vehicle travels smaller than when the battery 2 is charged, for example, an overcurrent abnormality occurs in the battery 2-1 when the vehicle travels and the battery 2-1 is disconnected. When the battery 2 is charged, the capacity of the remaining battery 2 can be made larger than the capacity of the remaining battery 2 when the battery 2-1 is disconnected and the battery 2-1 is disconnected. . Thereby, when an overcurrent abnormality occurs in the battery 2-1 when the vehicle travels, the vehicle can travel for a longer time than when an overcurrent abnormality occurs in the battery 2-1 when the battery 2 is charged. . That is, when the vehicle travels, when the battery 2 in which the overcurrent abnormality has occurred is disconnected and the remaining battery 2 is used to travel the vehicle to the installation location of the external charger 3, the vehicle can travel as long as possible. it can.

１ 過電流異常検出装置
２ 電池
３ 外部充電器
４ 充電制御部
５ 内部充電器
６ 電力変換部
７ 走行用モータ
８ 走行制御部
９ 電流検出部
１０ 温度検出部
１１ スイッチ
１２ 制御部
１３ 記憶部
１２１ 閾値設定部
１２２ 過電流異常検出部
１２３ スイッチ制御部
DESCRIPTION OF SYMBOLS 1 Overcurrent abnormality detection apparatus 2 Battery 3 External charger 4 Charging control part 5 Internal charger 6 Power conversion part 7 Running motor 8 Running control part 9 Current detection part 10 Temperature detection part 11 Switch 12 Control part 13 Storage part 121 Threshold value Setting unit 122 Overcurrent abnormality detection unit 123 Switch control unit

Claims (4)

電池の温度を検出する温度検出部と、
前記電池の充電中に前記温度検出部により検出される温度に応じて、又は、前記電池の放電中に前記温度検出部により検出される温度に応じて、閾値を設定する閾値設定部と、
前記電池に流れる電流を検出する電流検出部と、
前記電流検出部により検出される電流が前記閾値以上になると、前記電池に過電流異常が発生していることを検出する過電流異常検出部と、
を備えることを特徴とする過電流異常検出装置。 A temperature detector for detecting the temperature of the battery;
A threshold setting unit that sets a threshold according to a temperature detected by the temperature detection unit during charging of the battery or according to a temperature detected by the temperature detection unit during discharge of the battery;
A current detection unit for detecting a current flowing in the battery;
When the current detected by the current detection unit is equal to or greater than the threshold value, an overcurrent abnormality detection unit that detects that an overcurrent abnormality has occurred in the battery;
An overcurrent abnormality detection device comprising: 電池が搭載される車両の走行時、前記電池の充電時に比べて、閾値を小さくする閾値設定部と、
前記電池に流れる電流を検出する電流検出部と、
前記電流検出部により検出される電流が前記閾値以上になると、前記電池に過電流異常が発生していることを検出する過電流異常検出部と、
を備えることを特徴とする過電流異常検出装置。 A threshold setting unit that reduces the threshold compared to when charging the battery when the vehicle on which the battery is mounted;
A current detection unit for detecting a current flowing in the battery;
When the current detected by the current detection unit is equal to or greater than the threshold value, an overcurrent abnormality detection unit that detects that an overcurrent abnormality has occurred in the battery;
An overcurrent abnormality detection device comprising: 電池に発生する過電流異常を検出する過電流異常検出装置が、
前記電池の温度を検出し、
前記電池の充電中に前記検出した温度に応じて、又は、前記電池の放電中に前記検出した温度に応じて、閾値を設定し、
前記電池に流れる電流を検出し、
前記検出した電流が前記閾値以上になると、前記電池に過電流異常が発生していることを検出する
ことを特徴とする過電流異常検出方法。 An overcurrent abnormality detection device that detects an overcurrent abnormality that occurs in the battery
Detecting the temperature of the battery;
According to the detected temperature during charging of the battery or according to the detected temperature during discharging of the battery, a threshold is set,
Detecting the current flowing through the battery;
When the detected current is equal to or greater than the threshold, it is detected that an overcurrent abnormality has occurred in the battery. 電池に発生する過電流異常を検出する過電流異常検出装置が、
前記電池が搭載される車両の走行時、前記電池の充電時に比べて、閾値を小さくし、
前記電池に流れる電流を検出し、
前記検出した電流が前記閾値以上になると、前記電池に過電流異常が発生していることを検出する
ことを特徴とする過電流異常検出方法。
An overcurrent abnormality detection device that detects an overcurrent abnormality that occurs in the battery
When driving a vehicle on which the battery is mounted, the threshold value is made smaller than when the battery is charged,
Detecting the current flowing through the battery;
When the detected current is equal to or greater than the threshold, it is detected that an overcurrent abnormality has occurred in the battery.
JP2014209869A 2014-10-14 2014-10-14 Overcurrent abnormality detection device and overcurrent abnormality detection method Pending JP2016082642A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022269832A1 (en) * 2021-06-23 2022-12-29 株式会社EViP Discharge control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022269832A1 (en) * 2021-06-23 2022-12-29 株式会社EViP Discharge control circuit
JP7461093B2 (en) 2021-06-23 2024-04-03 和征 榊原 Discharge Control Circuit

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