JP2006221943A - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
JP2006221943A
JP2006221943A JP2005033839A JP2005033839A JP2006221943A JP 2006221943 A JP2006221943 A JP 2006221943A JP 2005033839 A JP2005033839 A JP 2005033839A JP 2005033839 A JP2005033839 A JP 2005033839A JP 2006221943 A JP2006221943 A JP 2006221943A
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contact
cells
cell
circuit
normally
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JP4819368B2 (en
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Fukuichi Takamatsu
福一 高松
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Tokin Corp
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NEC Tokin Tochigi Ltd
NEC Tokin 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

Abstract

<P>PROBLEM TO BE SOLVED: To protect each cell by detecting temperature abnormality of one of the cells connected in parallel. <P>SOLUTION: In a battery pack in which cells 4 made of a plurality of secondary batteries are connected in parallel, bimetals 3 having a normally-open contact and a normally-closed contact are connected to each of the cells 4, and the normally-closed contact is connected to a power supply line to a load through a switch contact 6 and the normally-open contact is connected to a drive circuit 5 for driving the switch contact 6. The temperature of the cells 4 is detected by the bimetals 3, and by detecting temperature abnormality, the normally-open contact is closed, and by driving the drive circuit 5, power supply line is cut off by the switch contact 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、複数の二次電池からなるセルを並列に接続したバッテリーパックに関する。   The present invention relates to a battery pack in which cells composed of a plurality of secondary batteries are connected in parallel.

複数の二次電池を直列接続して電池サブユニットとし、複数の電池サブユニットを並列接続したバッテリーパックにおいて、電池の稼働状態、故障状態を監視する構成として、電流ヒューズやＰＴＣなどからなる過電流保護素子を各電池サブユニットに直列に挿入したものが提案されている（例えば、特許文献１参照）。このバッテリーパックでは、各過電流保護素子にかかる電圧を監視し、その電圧の変化を検出することにより、異常電圧を検出したことを条件として回路遮断手段であるスイッチをオフにして、バッテリーパックを永久的にあるいは暫定的に使用不能になるように制御している。
特開２００４−１０３４８３号公報 In a battery pack in which a plurality of secondary batteries are connected in series to form a battery subunit and the plurality of battery subunits are connected in parallel, an overcurrent composed of a current fuse, a PTC, or the like is configured as a configuration for monitoring the operating state and failure state of the battery. A device in which a protection element is inserted in series in each battery subunit has been proposed (see, for example, Patent Document 1). In this battery pack, the voltage applied to each overcurrent protection element is monitored, and a change in the voltage is detected. It is controlled so that it cannot be used permanently or temporarily.
JP 2004-103483 A

上記従来のバッテリパックでは、二次電池に直列接続された過電流保護素子で過電流の保護を行う二次保護回路と、その過電流保護素子にかかる電圧や異常充電電圧などを検出する一時保護回路で構成され、一時保護回路において動作不良となった場合には、温度ヒューズやＰＴＣからなる過電流保護素子などの二次保護回路により直列に接続されたセルのみを回路から遮断するだけで、並列接続された全ての回路を外部から遮断することができない。これには、１つのセルが異常を起こして発熱した場合でも、異常のセルを並列回路内で二次保護素子により回路から遮断することにより、並列接続された他方のセルから保護、もしくは他方のセルからの電流の流入を阻止する目的があった。また、セルの温度検出には、セル毎に温度検出する最適部分に検出素子を取り付けることも必要である。その結果、外部から異常充電器などの接続により１つのセルを遮断するのみでは、他方のセルを外部異常から保護することができないという欠点がある。   In the conventional battery pack described above, a secondary protection circuit that performs overcurrent protection with an overcurrent protection element connected in series to the secondary battery, and temporary protection that detects a voltage applied to the overcurrent protection element, an abnormal charging voltage, or the like In the case of a malfunction in the temporary protection circuit composed of a circuit, only the cells connected in series by the secondary protection circuit such as a thermal fuse or an overcurrent protection element made of PTC are cut off from the circuit, All circuits connected in parallel cannot be shut off from the outside. Even if one cell is abnormal and generates heat, the abnormal cell is protected from the other cell connected in parallel by shutting off the abnormal cell from the circuit by the secondary protection element in the parallel circuit. The purpose was to block current flow from the cell. In addition, for detecting the temperature of the cell, it is also necessary to attach a detection element to the optimum portion for detecting the temperature for each cell. As a result, there is a drawback that it is not possible to protect the other cell from external abnormality only by shutting off one cell by connecting an abnormal charger or the like from the outside.

本発明は、上記課題を解決するものであって、並列接続のセルの１の温度異常を検出により各セルを保護できるようにするものである。   The present invention solves the above-described problem, and enables each cell to be protected by detecting one temperature abnormality of cells connected in parallel.

そのために本発明は、複数の二次電池からなるセルを並列に接続したバッテリーパックにおいて、前記セルのそれぞれに常開接点と常閉接点を有するバイメタルを接続し、前記常閉接点をスイッチ接点を通して負荷への給電路に接続し、前記常開接点を前記スイッチ接点を駆動する駆動回路に接続して、前記バイメタルによりセルの温度を検出し、温度異常の検出により前記常開接点を閉じて前記駆動回路を駆動し前記スイッチ接点により前記給電路を遮断するように構成したことを特徴とする。   For this purpose, the present invention provides a battery pack in which cells composed of a plurality of secondary batteries are connected in parallel, each of the cells is connected to a bimetal having a normally open contact and a normally closed contact, and the normally closed contact is passed through a switch contact. Connected to a power supply path to a load, connected the normally open contact to a drive circuit that drives the switch contact, detected the temperature of the cell by the bimetal, closed the normally open contact by detecting a temperature abnormality, A drive circuit is driven, and the power supply path is cut off by the switch contact.

本発明によれば、セルのそれぞれに接続したバイメタルのいずれかで温度異常を検出すると、常開接点が閉じて駆動回路を駆動しスイッチ接点により前記給電路を遮断するので、温度異常が検出されたセル及び他の性状なセルへの回路が遮断され、異常から各セルを保護することができる。   According to the present invention, when a temperature abnormality is detected in any of the bimetals connected to each of the cells, the normally open contact is closed, the drive circuit is driven, and the power supply path is shut off by the switch contact, so that the temperature abnormality is detected. The circuit to the open cell and other characteristic cells is cut off, and each cell can be protected from abnormalities.

以下、本発明の実施の形態を図面を参照しつつ説明する。図１は本発明に係るバッテリーパックの実施の形態を示す図であり、１は一次保護回路、２は二次保護回路、３はバイメタル、４はセル、５はスイッチ駆動回路、６はスイッチ接点を示す。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a battery pack according to the present invention, where 1 is a primary protection circuit, 2 is a secondary protection circuit, 3 is a bimetal, 4 is a cell, 5 is a switch drive circuit, and 6 is a switch contact. Indicates.

図１において、一次保護回路１は、Ａ、Ｂ、Ｃの３個のセル４からなる３並列のバッテリーパックを過充電、過放電、過電流から保護するためのバッテリー保護ＩＣおよびその周辺回路からなる保護回路であり、通常時のバッテリーパックの異常については、本回路が保護動作を行うことにより入力、出力を遮断する。二次保護回路２は、一次保護回路１が何らかの異常により機能しない状態となった場合に保護動作を行うようにしたものであり、バイメタル３、スイッチ駆動回路５、スイッチ接点６を使用している。   In FIG. 1, a primary protection circuit 1 includes a battery protection IC for protecting three parallel battery packs composed of three cells 4 of A, B, and C from overcharge, overdischarge, and overcurrent, and its peripheral circuit. This is a protection circuit, and when a battery pack malfunctions normally, the input and output are shut off by the protection operation of this circuit. The secondary protection circuit 2 is designed to perform a protection operation when the primary protection circuit 1 becomes inoperative due to some abnormality, and uses the bimetal 3, the switch drive circuit 5, and the switch contact 6. .

バイメタル３は、セル４のそれぞれに接続され、通常閉じて（オンして）いて所定温度検出時に開放（オフ）する接点Ａと、逆に通常開いていて所定温度検出時に閉じる接点Ｂを具備し、接点Ａをスイッチ接点６に接続し、接点Ｂをスイッチ駆動回路５に接続している。   The bimetal 3 is connected to each of the cells 4 and includes a contact A that is normally closed (turned on) and opened (turned off) when a predetermined temperature is detected, and a contact B that is normally open and closed when a predetermined temperature is detected. The contact A is connected to the switch contact 6, and the contact B is connected to the switch drive circuit 5.

スイッチ駆動回路５は、各バイメタル３の接点Ｂに接続されて、接点Ｂが閉じたときバイメタル３を介してセル４に接続され、セル４を電源としてスイッチ接点６を駆動するアナログ回路である。スイッチ接点６は、各バイメタル３の接点Ａと出力端子＋との間に接続され、通常は閉じてセル４から負荷への給電路を形成している。そして、スイッチ駆動回路５がセル４のいずれかに接続され駆動されるとスイッチ接点６は開放し、セル４から負荷への給電路（入出力回路）を遮断する。   The switch drive circuit 5 is an analog circuit that is connected to the contact B of each bimetal 3 and is connected to the cell 4 via the bimetal 3 when the contact B is closed, and drives the switch contact 6 using the cell 4 as a power source. The switch contact 6 is connected between the contact A of each bimetal 3 and the output terminal +, and is normally closed to form a power feeding path from the cell 4 to the load. When the switch drive circuit 5 is connected to any of the cells 4 and driven, the switch contact 6 is opened, and the power supply path (input / output circuit) from the cell 4 to the load is cut off.

次に、動作を説明する。セル４のうちの１個、例えばＣのセル４に何らかの異常が発生し、バイメタル３が駆動する所定温度に到達すると、接点Ａが開放して他のＤ、Ｅのセル４から切り離される。同時に接点Ｂが閉じてＣのセル４を電源としてスイッチ駆動回路５が駆動される。スイッチ駆動回路５が駆動されると、スイッチ接点６が開放され、バッテリーパックの入出力回路が遮断され、これにより、正常なＤ、Ｅのセル４は外部入出力回路から遮断される。   Next, the operation will be described. When some abnormality occurs in one of the cells 4, for example, the C cell 4 and reaches a predetermined temperature at which the bimetal 3 is driven, the contact A is opened and separated from the other D and E cells 4. At the same time, the contact B is closed, and the switch driving circuit 5 is driven using the C cell 4 as a power source. When the switch drive circuit 5 is driven, the switch contact 6 is opened and the input / output circuit of the battery pack is cut off, whereby the normal D and E cells 4 are cut off from the external input / output circuit.

なお、本発明は、上記実施の形態に限定されるものではなく、種々の変形が可能である。例えば上記実施の形態では、バイメタルにより所定温度を検出し、スイッチ駆動回路５を駆動してスイッチ接点６をオフにすることにより外部入出力から手段を行うようにしているが、ＦＥＴ素子やリレー等により回路の開放／接続を行うようにしてもよいし、また、アナログ回路部に外部電圧監視回路を設けるようにしてもよい。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above-described embodiment, a predetermined temperature is detected by bimetal, and the switch drive circuit 5 is driven and the switch contact 6 is turned off to perform the means from the external input / output. Thus, the circuit may be opened / connected, or an external voltage monitoring circuit may be provided in the analog circuit unit.

本発明に係るバッテリーパックの実施の形態を示す図である。It is a figure which shows embodiment of the battery pack which concerns on this invention.

符号の説明Explanation of symbols

１…一次保護回路、２…二次保護回路、３…バイメタル、４…セル、５…スイッチ駆動回路、６…スイッチ接点   DESCRIPTION OF SYMBOLS 1 ... Primary protection circuit, 2 ... Secondary protection circuit, 3 ... Bimetal, 4 ... Cell, 5 ... Switch drive circuit, 6 ... Switch contact

Claims (1)

複数の二次電池からなるセルを並列に接続したバッテリーパックにおいて、前記セルのそれぞれに常開接点と常閉接点を有するバイメタルを接続し、前記常閉接点をスイッチ接点を通して負荷への給電路に接続し、前記常開接点を前記スイッチ接点を駆動する駆動回路に接続して、前記バイメタルによりセルの温度を検出し、温度異常の検出により前記常開接点を閉じて前記駆動回路を駆動し前記スイッチ接点により前記給電路を遮断するように構成したことを特徴とするバッテリーパック。 In a battery pack in which cells composed of a plurality of secondary batteries are connected in parallel, a bimetal having a normally open contact and a normally closed contact is connected to each of the cells, and the normally closed contact is used as a power supply path to a load through a switch contact. Connecting, connecting the normally open contact to a drive circuit for driving the switch contact, detecting the temperature of the cell by the bimetal, and closing the normally open contact by detecting a temperature abnormality to drive the drive circuit, A battery pack configured to cut off the power supply path by a switch contact.
JP2005033839A 2005-02-10 2005-02-10 battery pack Expired - Fee Related JP4819368B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008136448A1 (en) * 2007-04-27 2008-11-13 Sanyo Electric Co., Ltd. Power supply device and electric vehicle
JP2008295291A (en) * 2007-04-27 2008-12-04 Sanyo Electric Co Ltd Power supply apparatus and electric vehicle
US8334674B2 (en) 2007-01-17 2012-12-18 Samsung Sdi Co., Ltd. Hybrid battery and its charging/discharging method
CN116794504A (en) * 2023-08-21 2023-09-22 深圳海辰储能控制技术有限公司 Dry contact output detection circuit and method, energy storage system and storage medium
GB2618826A (en) * 2022-05-19 2023-11-22 Hudson Gary A device for battery fire safety

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001126780A (en) * 1999-10-28 2001-05-11 Sanyo Electric Co Ltd Battery pack
JP2004206894A (en) * 2002-12-24 2004-07-22 Nec Tokin Tochigi Ltd Battery pack with built-in protection circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001126780A (en) * 1999-10-28 2001-05-11 Sanyo Electric Co Ltd Battery pack
JP2004206894A (en) * 2002-12-24 2004-07-22 Nec Tokin Tochigi Ltd Battery pack with built-in protection circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8334674B2 (en) 2007-01-17 2012-12-18 Samsung Sdi Co., Ltd. Hybrid battery and its charging/discharging method
US8803479B2 (en) 2007-01-17 2014-08-12 Samsung Sdi Co., Ltd. Hybrid battery and its charging/discharging method
WO2008136448A1 (en) * 2007-04-27 2008-11-13 Sanyo Electric Co., Ltd. Power supply device and electric vehicle
JP2008295291A (en) * 2007-04-27 2008-12-04 Sanyo Electric Co Ltd Power supply apparatus and electric vehicle
GB2618826A (en) * 2022-05-19 2023-11-22 Hudson Gary A device for battery fire safety
CN116794504A (en) * 2023-08-21 2023-09-22 深圳海辰储能控制技术有限公司 Dry contact output detection circuit and method, energy storage system and storage medium
CN116794504B (en) * 2023-08-21 2024-01-02 深圳海辰储能科技有限公司 Dry contact output detection circuit and method, energy storage system and storage medium

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