JP2001157367A - Method of detecting poor connection of cells in battery pack and power supply unit therefor - Google Patents
Method of detecting poor connection of cells in battery pack and power supply unit thereforInfo
- Publication number
- JP2001157367A JP2001157367A JP33239499A JP33239499A JP2001157367A JP 2001157367 A JP2001157367 A JP 2001157367A JP 33239499 A JP33239499 A JP 33239499A JP 33239499 A JP33239499 A JP 33239499A JP 2001157367 A JP2001157367 A JP 2001157367A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- battery cell
- voltage
- terminals
- terminal
- 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.)
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Classifications
-
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、組み電池セルの接
続不良検出方法及び組み電池セルを用いた電源装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a connection failure of an assembled battery cell and a power supply device using the assembled battery cell.
【０００２】[0002]
【従来の技術】従来、２次電池を複数個直列接続して、
ケース内に収納したバッテリーパックが多種の電子機器
に使用されている。このようなバッテリーパックを使用
することにより、電池単体を扱う場合よりも取扱いが簡
単になると共に、電子機器におけるバッテリー収納部の
構成が簡単になるという利点がある。2. Description of the Related Art Conventionally, a plurality of secondary batteries are connected in series,
A battery pack stored in a case is used for various electronic devices. By using such a battery pack, there is an advantage that the handling is easier than when a single battery is used, and the configuration of the battery storage unit in the electronic device is simplified.
【０００３】２次電池としては、従来、鉛蓄電池、ニッ
ケル−カドミウム電池、ニッケル−水素電池等がある
が、近年、移動体通信機、ラップトップ型パソコン、ノ
ートブック型パソコン、パームトップ型パソコン、一体
型ビデオカメラ、ポータブルＣＤプレーヤー、ＭＤプレ
ーヤー、ポータブルワープロ、ヘッドフォンステレオ、
コードレス電話、セルラー電話等の電子機器の小型化、
軽量化を図る上で、これらの電子機器の電源としての２
次電池の高容量化が要望され、リチウムイオンをドープ
・脱ドープできる炭素質材料を用いたリチウムイオン２
次電池（例えば、特公平４−２４８３１号公報等）が、
負極にリチウム金属又はその合金を使用したリチウム２
次電池に比して、安全性の点で格段に優れており、高エ
ネルギー密度を得られることから注目されている。Conventional secondary batteries include lead storage batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and the like. In recent years, mobile communication devices, laptop computers, notebook computers, palmtop computers, Integrated video camera, portable CD player, MD player, portable word processor, headphone stereo,
Miniaturization of electronic devices such as cordless phones and cellular phones,
In order to reduce the weight, 2
Demand for higher capacity secondary batteries, lithium ion 2 using a carbonaceous material capable of doping / dedoping lithium ions
The following battery (for example, Japanese Patent Publication No. Hei 4-24831)
Lithium 2 using lithium metal or its alloy for negative electrode
Compared to secondary batteries, they are much better in terms of safety, and have attracted attention because of their high energy density.
【０００４】上記、リチウムイオン２次電池は、電圧
１．２Ｖの２次電池としてのニッケル−カドミウム電
池、ニッケル−水素吸蔵合金電池、電圧２．０Ｖの鉛蓄
電池に比して、軽量且つ高容量であり、平均電圧が３．
５Ｖ〜３．６Ｖと高く、さらに放電電圧が傾斜してお
り、残量表示が可能である利点がある。また、電池形状
としては、円筒形、薄型、ボタン型等がある。The above-mentioned lithium ion secondary battery is lighter and has a higher capacity than a nickel-cadmium battery, a nickel-hydrogen storage alloy battery, and a 2.0 V lead storage battery as a secondary battery having a voltage of 1.2 V. And the average voltage is 3.
It is as high as 5 V to 3.6 V, and has an advantage that the discharge voltage is inclined and the remaining amount can be displayed. Further, as the battery shape, there are a cylindrical shape, a thin shape, a button type, and the like.
【０００５】しかしながら、かかるリチウムイオン２次
電池は、電解質溶液の電気化学的安定性の点で、電池電
圧４．５Ｖ以上において、溶液に使用される溶媒が分解
し、ガス発生を伴い、電池内圧が上昇し、ガス開放のラ
プチャーが作動する。通常の使用下では、セル当たり
４．４Ｖ〜４．３Ｖの領域において過充電を防止するこ
とが望ましく、またカットオフ電圧をセル当たり２．７
Ｖ〜２．５Ｖにするが、２．０Ｖ以下では使用する集電
体と炭素質材料との組合せにより、集電体の溶解が起こ
ることもあるので、かかる過放電を回避する必要があ
る。However, in the lithium ion secondary battery, in view of the electrochemical stability of the electrolyte solution, when the battery voltage is 4.5 V or more, the solvent used in the solution is decomposed, gas is generated, and the internal pressure of the battery is increased. Rises, and the gas release rupture is activated. Under normal use, it is desirable to prevent overcharging in the range of 4.4V to 4.3V per cell and to set the cutoff voltage to 2.7V per cell.
Although the voltage is set to V to 2.5 V, if the voltage is 2.0 V or less, the current collector may be dissolved depending on the combination of the current collector and the carbonaceous material used. Therefore, it is necessary to avoid such overdischarge.
【０００６】このようなリチウムイオン２次電池を用い
たバッテリーパックにおいては、例えば図２に示すよう
な保護回路を内蔵したものが知られている。As a battery pack using such a lithium ion secondary battery, for example, a battery pack having a built-in protection circuit as shown in FIG. 2 is known.
【０００７】図２において、１は電源装置としてのバッ
テリーパック、２は２次電池セル２ａを２つ並列接続し
たものを１ブロックとして、３つのブロックを直列接続
されてなる組み電池セルである。また、３は保護回路
で、組み電池セル２の各２次電池セル２ａに対する過充
電を防止する回路である。In FIG. 2, reference numeral 1 denotes a battery pack as a power supply device, and reference numeral 2 denotes an assembled battery cell in which two blocks of two secondary battery cells 2a are connected in parallel, and three blocks are connected in series. Reference numeral 3 denotes a protection circuit that prevents overcharge of each rechargeable battery cell 2a of the assembled battery cell 2.
【０００８】組み電池セル２は、図３に示すように、６
つの２次電池セル２ａを固定部材２ｃに固定してなり、
固定部材２ｃの一側面に保護回路３との接続用のコネク
タ２ｂが設けられている。コネクタ２ｂには４つの端子
TP1〜TP4が設けられ、端子TP1は正極端子、端子TP4は負
極端子として直列接続された２次電池セル２ａに接続さ
れている。また、残り２つの端子TP2,TP3は２次電池セ
ル２ａ同士の接続点に接続されている。これにより、何
れか２つの端子TP1〜TP4を用いて各ブロックにおける２
次電池セル２ａの端子間電圧を検出できるようになって
いる。[0008] As shown in FIG.
Two secondary battery cells 2a are fixed to a fixing member 2c,
A connector 2b for connection to the protection circuit 3 is provided on one side surface of the fixing member 2c. The connector 2b has four terminals
TP1 to TP4 are provided, and the terminal TP1 is connected to the secondary battery cell 2a connected in series as a positive terminal and the terminal TP4 as a negative terminal. The remaining two terminals TP2 and TP3 are connected to a connection point between the secondary battery cells 2a. As a result, any two terminals TP1 to TP4 can be used to make the 2
The terminal voltage of the secondary battery cell 2a can be detected.
【０００９】保護回路３は、１つのプリント基板上に形
成され、図２に示すように、放電回路３ａ、セル電圧比
較回路３ｂ、コントロール回路３ｃ、電界効果トランジ
スタ（以下、ＦＥＴと称する）３ｄ，３ｅから構成され
ている。The protection circuit 3 is formed on a single printed circuit board. As shown in FIG. 2, a discharge circuit 3a, a cell voltage comparison circuit 3b, a control circuit 3c, a field effect transistor (hereinafter referred to as FET) 3d, 3e.
【００１０】放電回路３ａは、３つのＰＮＰ型トランジ
スタＴr1〜Ｔr3及び３つの抵抗器Ｒａ〜Ｒｃから構成さ
れ、トランジスタと抵抗器の直列回路が３組形成され、
これら３組の直列回路のそれぞれは、コネクタ２ｂの端
子TP1とTP2との間、端子TP2とTP3との間、端子TP3とTP4
との間に接続されている。The discharge circuit 3a is composed of three PNP transistors Tr1 to Tr3 and three resistors Ra to Rc, and three sets of series circuits of transistors and resistors are formed.
Each of these three series circuits is connected between the terminals TP1 and TP2, between the terminals TP2 and TP3, and between the terminals TP3 and TP4 of the connector 2b.
Is connected between.
【００１１】セル電圧比較回路３ｂは、３つのコンパレ
ータＱ１〜Ｑ３、３つの基準電圧源Ｖthとから構成され
ている。コンパレータＱ１の反転入力端子は組み電池セ
ル２の正極端子（コネクタ２の端子TP1）に接続され、
非反転入力端子は基準電圧源Ｖthの正極に接続され、基
準電圧源Ｖthの負極は端子TP2に接続されている。ま
た、コンパレータＱ２の反転入力端子は組み電池セル２
の端子TP2に接続され、非反転入力端子は基準電圧源Ｖt
hの正極に接続され、基準電圧源Ｖthの負極は端子TP3に
接続されている。コンパレータＱ３の反転入力端子は組
み電池セル２端子TP3に接続され、非反転入力端子は基
準電圧源Ｖthの正極に接続され、基準電圧源Ｖthの負極
は端子TP4に接続されている。The cell voltage comparison circuit 3b includes three comparators Q1 to Q3 and three reference voltage sources Vth. The inverting input terminal of the comparator Q1 is connected to the positive terminal (terminal TP1 of the connector 2) of the assembled battery cell 2,
The non-inverting input terminal is connected to the positive terminal of the reference voltage source Vth, and the negative terminal of the reference voltage source Vth is connected to the terminal TP2. The inverting input terminal of the comparator Q2 is the assembled battery cell 2
Non-inverting input terminal is connected to the reference voltage source Vt.
The negative terminal of the reference voltage source Vth is connected to the terminal TP3. The inverting input terminal of the comparator Q3 is connected to the assembled battery cell 2 terminal TP3, the non-inverting input terminal is connected to the positive electrode of the reference voltage source Vth, and the negative electrode of the reference voltage source Vth is connected to the terminal TP4.
【００１２】また、各コンパレータＱ１〜Ｑ３の出力端
子はコントロール回路３ｃに接続されると共に、１対１
に対応してトランジスタＴr1〜Ｔr3のベースに接続され
ている。The output terminals of each of the comparators Q1 to Q3 are connected to a control circuit 3c.
Are connected to the bases of the transistors Tr1 to Tr3.
【００１３】ＦＥＴ３ｄ，３ｅは直列接続されて正極出
力端子４ａとコネクタ２ｂの正極端子TP1との間に接続
されている。また、ＦＥＴ３ｄ，３ｅのゲートはコント
ロール回路３ｃに接続されている。また、負極出力端子
４ｂは、コネクタ２ｂの負極端子TP4に接続されてい
る。The FETs 3d and 3e are connected in series and connected between the positive output terminal 4a and the positive terminal TP1 of the connector 2b. The gates of the FETs 3d and 3e are connected to the control circuit 3c. The negative output terminal 4b is connected to the negative terminal TP4 of the connector 2b.
【００１４】コントロール回路３ｃは、何れかのコンパ
レータＱ１〜Ｑ３の出力電圧がハイレベルからローレベ
ルに変化したときに、ＦＥＴ３ｄ，３ｅをオフ状態にす
る信号を各ＦＥＴ３ｄ，３ｅのゲートに出力する。The control circuit 3c outputs a signal for turning off the FETs 3d and 3e to the gates of the FETs 3d and 3e when the output voltage of any of the comparators Q1 to Q3 changes from the high level to the low level.
【００１５】前述の構成では、組み電池セル２を充電す
る際に、何れか一つの二次電子セル２ａが過充電状態に
なったとき、即ち２次電池セル２ａの端子間電圧が基準
電圧源Ｖthよりも高くなったときに、この２次電池セル
２ａに対応したコンパレータＱ１〜Ｑ３の出力信号電圧
がハイレベルからローレベルに変化する。これにより、
コントロール回路３ｃはＦＥＴ３ｄ，３ｅをオフ状態に
設定し、組み電池セル２への通電を遮断する。さらに、
コンパレータＱ１〜Ｑ３の出力信号がハイレベルからロ
ーレベルに変化すると、この信号を受けたトランジスタ
Ｔr1〜Ｔr3はオフ状態からオン状態に変化し、過充電状
態になった２次電池セル２ａを放電させる。In the above-described configuration, when any one of the secondary electron cells 2a is overcharged when charging the assembled battery cell 2, that is, the voltage between the terminals of the secondary battery cell 2a is changed to the reference voltage source. When the voltage becomes higher than Vth, the output signal voltages of the comparators Q1 to Q3 corresponding to the secondary battery cell 2a change from the high level to the low level. This allows
The control circuit 3c sets the FETs 3d and 3e to the off state, and cuts off the power supply to the assembled battery cell 2. further,
When the output signals of the comparators Q1 to Q3 change from the high level to the low level, the transistors Tr1 to Tr3 receiving this signal change from the off state to the on state, and discharge the overcharged secondary battery cell 2a. .
【００１６】従って、２次電池セル２ａの過充電状態を
回避することができ、２次電池セル２ａの劣化或いは破
損を防止することができる。Therefore, the overcharge state of the secondary battery cell 2a can be avoided, and the deterioration or breakage of the secondary battery cell 2a can be prevented.
【００１７】また、上記の基準電圧源Ｖthの電圧値を変
更したセル電圧比較回路を用いれば、過放電防止制御機
能を持たせることもできる。If a cell voltage comparison circuit in which the voltage value of the reference voltage source Vth is changed is used, an overdischarge prevention control function can be provided.
【００１８】[0018]
【発明が解決しようとする課題】しかしながら、組み電
池セル２のコネクタ２ｂにおける各端子TP1〜TP4と保護
回路３との接続不良が生じることがあり、この接続不良
が生じると２次電池セル２ａの正確な端子間電圧を検出
できずに、過充電を引き起こすことがあった。However, in some cases, connection failures between the terminals TP1 to TP4 of the connector 2b of the assembled battery cell 2 and the protection circuit 3 may occur, and if this connection failure occurs, the connection of the secondary battery cell 2a may occur. In some cases, overcharging was caused because the voltage between terminals could not be accurately detected.
【００１９】即ち、組み電池セル２のコネクタ２ｂに接
続される保護回路３の入力側は、２次電池セル２ａの電
力消費を避けるために非常に高いインピーダンスに設定
されている。このため、図４に示すように各コンパレー
タＱ１〜Ｑ３の入力側には、それぞれ浮遊容量Ｃ１〜Ｃ
３が発生し、この浮遊容量Ｃ１〜Ｃ３に２次電池セル２
ａの端子間電圧が保持される。従って、コネクタ２ｂの
端子TP1〜TP4に接続不良が生じた場合、２次電池セル２
ａの正確な端子間電圧を検出できずに、過充電を引き起
こすこともあった。That is, the input side of the protection circuit 3 connected to the connector 2b of the assembled battery cell 2 is set to a very high impedance in order to avoid power consumption of the secondary battery cell 2a. For this reason, as shown in FIG. 4, stray capacitances C1 to C3 are provided on the input sides of the comparators Q1 to Q3, respectively.
3 is generated, and the secondary battery cells 2 are added to the stray capacitances C1 to C3.
The voltage between the terminals a is held. Therefore, when a connection failure occurs in the terminals TP1 to TP4 of the connector 2b, the secondary battery cell 2
In some cases, it was not possible to detect an accurate inter-terminal voltage of “a”, resulting in overcharging.
【００２０】また、過放電状態を回避する保護回路の場
合も同様であった。The same is true for a protection circuit for avoiding an overdischarge state.
【００２１】本発明の目的は上記の問題点に鑑み、組み
電池セルと保護回路との間の接続不良を検出できる組み
電池セルの接続不良検出方法、及び組み電池セルと保護
回路との間の接続不良が生じても保護回路の誤動作を回
避できる電源装置を提供することである。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a method for detecting a connection failure between a battery pack and a protection circuit which can detect a connection failure between the battery pack and a protection circuit. An object of the present invention is to provide a power supply device capable of avoiding a malfunction of a protection circuit even if a connection failure occurs.
【００２２】[0022]
【課題を解決するための手段】本発明は上記の目的を達
成するために請求項１では、直列接続された２つ以上の
２次電池セルと、各２次電池セル毎に設けられ２次電池
セルの両端子のそれぞれに接続される検出端子を有し該
検出端子間の電圧に基づいて各２次電池セルの過充電或
いは過放電の少なくとも一方を検出する検出手段とを備
えた電源装置における組み電池セルの接続不良検出方法
であって、前記２次電池セルの端子間電圧を入力する前
記検出端子間を所定時間短絡した後に、２次電池セルの
過充電或いは過放電の少なくとも一方を検出すると共
に、前記検出端子の短絡を解除した後に所定時間経過し
ても前記検出電圧がほぼ短絡状態の電圧であるときに、
前記２次電池セルと前記検出端子との間が非導通状態に
あると判断する組み電池セルの接続不良検出方法を提案
する。According to the present invention, in order to achieve the above object, two or more secondary battery cells connected in series and a secondary battery provided for each secondary battery cell are provided. A power supply device having a detection terminal connected to each of the two terminals of the battery cell, and detection means for detecting at least one of overcharge or overdischarge of each secondary battery cell based on a voltage between the detection terminals; In the method for detecting the connection failure of the assembled battery cell in the above, after short-circuiting between the detection terminals for inputting the voltage between the terminals of the secondary battery cell for a predetermined time, at least one of overcharge or overdischarge of the secondary battery cell is performed. When the detection voltage is substantially short-circuited even after a predetermined time has elapsed after the detection terminal is short-circuited,
A method of detecting a connection failure of the assembled battery cell that determines that the connection between the secondary battery cell and the detection terminal is in a non-conductive state is proposed.
【００２３】該組み電池セルの接続不良検出方法では、
前記２次電池セルの電力消費を回避するために前記検出
端子間が高いインピーダンスに設定され、該検出端子間
に浮遊容量が生じていても、前記検出端子を所定時間短
絡することにより、前記浮遊容量に保持されていた電圧
は放電される。この後、前記短絡を解除することによ
り、２次電池セルと検出端子との間が導通状態にあれば
前記検出端子には２次電池セルの検出電圧が印加され、
過充電状態或いは過放電状態の正常な検出が行われる。
また、該短絡を解除した後に所定時間経過しても前記検
出端子の電圧がほぼ短絡状態の電圧であるときは、前記
２次電池セルと前記検出端子との間が非導通状態にある
と判断する。即ち、誤検出が防止される。In the method of detecting a connection failure of the assembled battery cell,
Even if the detection terminals are set to a high impedance between the detection terminals in order to avoid power consumption of the secondary battery cells, and a stray capacitance is generated between the detection terminals, the detection terminals are short-circuited for a predetermined time, whereby the floating The voltage held in the capacitor is discharged. Thereafter, by removing the short circuit, if the connection between the secondary battery cell and the detection terminal is in a conductive state, the detection voltage of the secondary battery cell is applied to the detection terminal,
Normal detection of the overcharge state or the overdischarge state is performed.
In addition, when the voltage of the detection terminal is substantially the voltage in the short-circuit state even after the lapse of a predetermined time after the short-circuit is released, it is determined that the connection between the secondary battery cell and the detection terminal is in a non-conductive state. I do. That is, erroneous detection is prevented.
【００２４】また、請求項２では、請求項１記載の組み
電池セルの接続不良検出方法において、スイッチング素
子を用いて前記検出端子を短絡する組み電池セルの接続
不良検出方法を提案する。According to a second aspect of the present invention, there is provided a method of detecting a connection failure of an assembled battery cell in which the detection terminal is short-circuited using a switching element.
【００２５】該組み電池セルの接続不良検出方法によれ
ば、前記スイッチング素子の導通・非導通状態を電気的
に制御可能になるので、集積化に適している。According to the method of detecting a connection failure of the assembled battery cell, the conduction / non-conduction state of the switching element can be electrically controlled, which is suitable for integration.
【００２６】また、請求項３では、接続対象となる直列
接続された２つ以上の２次電池セルの各両端子のそれぞ
れに接続される検出端子を有し該端子間電圧を検出し該
検出結果に基づいて各２次電池セルの過充電状態或いは
過放電状態を検知し、前記２次電池セルに対する充電制
御及び放電制御の少なくとも一方を行い前記２次電池セ
ルを保護する保護回路とを備えた電源装置において、各
２次電池セルに対応した前記検出端子間に接続されたス
イッチング素子と、前記スイッチング素子を周期的に所
定時間オン状態に切り替える切替制御手段とを備え、前
記保護回路は、前記スイッチング素子がオン状態からオ
フ状態に設定されてから該スイッチング素子に並列接続
されている２次電池セルの端子間電圧を検出し、該検出
電圧がほぼ短絡状態の電圧であるときに前記２次電池セ
ルと上位装置への接続端子との間を非導通状態に設定す
る手段を備えている電源装置を提案する。According to a third aspect of the present invention, there is provided a detecting terminal connected to each of both terminals of two or more rechargeable battery cells connected in series to be connected. A protection circuit that detects an overcharged state or an overdischarged state of each secondary battery cell based on the result, and performs at least one of charge control and discharge control on the secondary battery cell to protect the secondary battery cell. A power supply device, comprising: a switching element connected between the detection terminals corresponding to the respective secondary battery cells; and switching control means for periodically switching the switching element to an ON state for a predetermined time, wherein the protection circuit includes: After the switching element is set from the on state to the off state, the voltage between the terminals of the secondary battery cells connected in parallel to the switching element is detected, and the detected voltage is substantially short-circuited. Between the connection terminal to the secondary battery cells and the host device proposes to have a power supply device comprising means for setting to a non-conductive state when a voltage.
【００２７】該電源装置によれば、接続対象となる２次
電池セルの電力消費を回避するために、２次電池セルに
接続される前記保護回路の入力側が高いインピーダンス
に設定され、該入力側に浮遊容量が生じていても、前記
スイッチング素子によって前記保護回路の検出端子を所
定時間短絡することにより、前記浮遊容量に保持されて
いた電圧は放電される。この後、前記スイッチング素子
による短絡を解除することにより、２次電池セルと保護
回路の検出端子との間が導通状態にあれば検出端子には
２次電池セルの検出電圧が印加され、過充電状態或いは
過放電状態の正常な検出が行われる。また、該短絡を解
除した後に前記保護回路の検出端子電圧がほぼ短絡状態
の電圧であるときは、前記２次電池セルと前記保護回路
の検出端子との間が非導通状態にあり正常な検出ができ
なかったものと判断し、前記２次電池セルと上位装置と
の間を非導通状態に設定する。これにより、誤検出が防
止される。According to the power supply device, in order to avoid power consumption of the secondary battery cell to be connected, the input side of the protection circuit connected to the secondary battery cell is set to a high impedance, Even if a stray capacitance occurs, the voltage held in the stray capacitance is discharged by short-circuiting the detection terminal of the protection circuit by the switching element for a predetermined time. Thereafter, by removing the short circuit caused by the switching element, if the connection between the secondary battery cell and the detection terminal of the protection circuit is in a conductive state, the detection voltage of the secondary battery cell is applied to the detection terminal, resulting in overcharging. Normal detection of the state or the overdischarge state is performed. In addition, when the detection terminal voltage of the protection circuit is almost the short-circuited state voltage after the short-circuit is released, the connection between the secondary battery cell and the detection terminal of the protection circuit is in a non-conductive state, and the normal detection is performed. Is determined to have failed, and the non-conductive state is set between the secondary battery cell and the host device. This prevents erroneous detection.
【００２８】また、請求項４では、直列接続された２つ
以上の二次電池セルと、各二次電池セルの両端子のそれ
ぞれに接続される検出端子を有し該端子間電圧を検出し
該検出結果に基づいて各二次電池セルの過充電状態或い
は過放電状態を検知し、前記二次電池セルに対する充電
制御及び放電制御の少なくとも一方を行い前記二次電池
セルを保護する保護回路とを備えた電源装置において、
各二次電池セルに対応した検出端子間に接続されたスイ
ッチング素子と、前記スイッチング素子を周期的に所定
時間オン状態に切り替える切替制御手段とを備えると共
に、前記保護回路は、前記スイッチング素子がオン状態
からオフ状態に設定されてから該スイッチング素子に並
列接続されている二次電池セルの端子間電圧を検出し、
該検出電圧がほぼ短絡状態の電圧であるときに前記二次
電池セルと上位装置への接続端子との間を非導通状態に
設定する手段を備え、前記直列接続された２つ以上の２
次電池セルは、各２次電池セルの各端子に接続された複
数の接続端子を有すると共に該接続端子と前記切替手段
及び保護回路とが接続されている電源装置を提案する。According to a fourth aspect of the present invention, there are provided two or more secondary battery cells connected in series, and a detection terminal connected to each of both terminals of each secondary battery cell. A protection circuit that detects an overcharge state or an overdischarge state of each secondary battery cell based on the detection result, and performs at least one of charge control and discharge control on the secondary battery cell to protect the secondary battery cell; and In the power supply device having
A switching element connected between detection terminals corresponding to the respective secondary battery cells, and switching control means for periodically switching the switching element to an on state for a predetermined time; and the protection circuit, wherein the switching element is turned on. Detecting the voltage between the terminals of the secondary battery cells connected in parallel to the switching element after being set to the off state from the state,
Means for setting a non-conductive state between the secondary battery cell and a connection terminal to a higher-level device when the detection voltage is substantially a short-circuit voltage, wherein the two or more series-connected two or more
A secondary battery cell proposes a power supply device having a plurality of connection terminals connected to each terminal of each secondary battery cell, and connecting the connection terminals to the switching means and the protection circuit.
【００２９】該電源装置によれば、前記２次電池セルと
前記スイッチング素子及び保護回路は、コネクタ等の接
続端子によって接続される。さらに、２次電池セルの電
力消費を回避するために、２次電池セルに接続される前
記保護回路の入力側が高いインピーダンスに設定され、
該入力側に浮遊容量が生じていても、前記スイッチング
素子によって前記保護回路の検出端子を所定時間短絡す
ることにより、前記浮遊容量に保持されていた電圧は放
電される。この後、前記スイッチング素子による短絡を
解除することにより、２次電池セルと保護回路の検出端
子との間が導通状態にあれば検出端子には２次電池セル
の検出電圧が印加され、過充電状態或いは過放電状態の
正常な検出が行われる。また、該短絡を解除した後に前
記保護回路の検出端子電圧がほぼ短絡状態の電圧である
ときは、前記２次電池セルと前記保護回路の検出端子と
の間が非導通状態にあり正常な検出ができなかったもの
と判断し、前記２次電池セルと上位装置との間を非導通
状態に設定する。これにより、２次電池の電力消費を減
らすと共に、保護回路における誤検出が防止される。According to the power supply device, the secondary battery cell, the switching element, and the protection circuit are connected by a connection terminal such as a connector. Further, in order to avoid power consumption of the secondary battery cell, the input side of the protection circuit connected to the secondary battery cell is set to a high impedance,
Even if a stray capacitance occurs on the input side, the voltage held in the stray capacitance is discharged by short-circuiting the detection terminal of the protection circuit by the switching element for a predetermined time. Thereafter, by removing the short circuit caused by the switching element, if the connection between the secondary battery cell and the detection terminal of the protection circuit is in a conductive state, the detection voltage of the secondary battery cell is applied to the detection terminal, resulting in overcharging. Normal detection of the state or the overdischarge state is performed. In addition, when the detection terminal voltage of the protection circuit is almost the short-circuited state voltage after the short-circuit is released, the connection between the secondary battery cell and the detection terminal of the protection circuit is in a non-conductive state, and the normal detection is performed. Is determined to have failed, and the non-conductive state is set between the secondary battery cell and the host device. This reduces power consumption of the secondary battery and prevents erroneous detection in the protection circuit.
【００３０】また、請求項５では、請求項３又は４記載
の電源装置において、最も正極側に位置する２次電池セ
ルを除く他の２次電池セルのみに前記スイッチング素子
が接続されている電源装置を提案する。According to a fifth aspect of the present invention, in the power supply device according to the third or fourth aspect, the switching element is connected only to the other secondary battery cells except for the secondary battery cell located on the most positive side. Suggest a device.
【００３１】該電源装置によれば、前記最も正極側に位
置する２次電池セルの正極端子は、前記スイッチング素
子及び保護回路に接続されると共に上位装置にも接続さ
れるため、該２次電池セルの正極端子との間に接続不良
が生じた場合、上位装置との間も非導通状態になるの
で、前記正極端子の接続不良は容易に発見可能である。
従って、前記正極端子以外の接続不良を検出すること
で、接続不良による過充電或いは過放電を回避すること
ができる。According to the power supply device, the positive terminal of the secondary battery cell located closest to the positive electrode is connected to the switching element and the protection circuit and also to a higher-level device. When a connection failure occurs between the cell and the positive electrode terminal, the connection to the host device also becomes non-conductive, so that the connection failure of the positive electrode terminal can be easily found.
Therefore, by detecting a connection failure other than the positive terminal, overcharge or overdischarge due to the connection failure can be avoided.
【００３２】また、請求項６では、請求項３記載の電源
装置において、前記スイッチング素子は、パルス信号を
入力して該パルス信号のパルス幅の間のみオン状態を維
持するものであり、前記切替制御手段は、各スイッチン
グ素子に対して周期的に前記パルス信号を出力する手段
を有する電源装置を提案する。According to a sixth aspect of the present invention, in the power supply device according to the third aspect, the switching element receives a pulse signal and maintains an ON state only during a pulse width of the pulse signal. The control unit proposes a power supply device having a unit that periodically outputs the pulse signal to each switching element.
【００３３】該電源装置によれば、前記スイッチング素
子が周期的にオン状態にされ、これに同期して保護回路
の検出動作が行われる。これにより、２次電池セルの電
力消費を低減できる。According to the power supply device, the switching element is periodically turned on, and in synchronization with this, the detection operation of the protection circuit is performed. Thereby, the power consumption of the secondary battery cells can be reduced.
【００３４】[0034]
【発明の実施の形態】以下、図面に基づいて本発明の一
実施形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００３５】図１は、本発明の第１の実施形態における
電源装置としてのバッテリーパックを示す回路図であ
る。図において、１０はバッテリーパックで、組み電池
セル２と保護回路１１を備えている。組み電池セル２
は、前述した従来例と同じ組み電池セルである。本実施
形態では、過放電防止機能のみを有する保護回路１１を
備えている。FIG. 1 is a circuit diagram showing a battery pack as a power supply device according to the first embodiment of the present invention. In the figure, reference numeral 10 denotes a battery pack, which includes an assembled battery cell 2 and a protection circuit 11. Assembled battery cell 2
Is the same assembled battery cell as the conventional example described above. In the present embodiment, a protection circuit 11 having only an overdischarge prevention function is provided.
【００３６】保護回路１１は、１つのプリント基板上に
形成され、放電回路１２、セル電圧比較回路１３、パル
ス発生器１４、コントロール回路１５、及び電界効果ト
ランジスタ（以下、ＦＥＴと称する）１６，１７から構
成されている。The protection circuit 11 is formed on one printed circuit board, and includes a discharge circuit 12, a cell voltage comparison circuit 13, a pulse generator 14, a control circuit 15, and field effect transistors (hereinafter referred to as FETs) 16, 17. It is composed of
【００３７】また、図示していないが保護回路１１が形
成されているプリント基板には、組み電池セル２のコネ
クタ２ｂに嵌合するコネクタが設けられ、これらのコネ
クタによって組み電池セル２と保護回路１１とが接続さ
れている。Although not shown, the printed circuit board on which the protection circuit 11 is formed is provided with connectors to be fitted to the connectors 2b of the assembled battery cells 2, and these connectors are used to connect the assembled battery cells 2 and the protection circuit. 11 are connected.
【００３８】放電回路１２は、３つのＰＮＰ型トランジ
スタ１２１〜１２３及び３つの抵抗器１２４〜１２６か
ら構成され、トランジスタと抵抗器の直列回路が３組形
成され、これら３組の直列回路のそれぞれは、コネクタ
２ｂの端子TP1とTP2との間、端子TP2とTP3との間、端子
TP3とTP4との間に接続されている。The discharge circuit 12 is composed of three PNP transistors 121 to 123 and three resistors 124 to 126. Three series circuits of transistors and resistors are formed. Each of these three series circuits is Between the terminals TP1 and TP2 of the connector 2b, between the terminals TP2 and TP3,
Connected between TP3 and TP4.
【００３９】また、各トランジスタ１２１〜１２３のベ
ースはパルス発生器１４に接続され、各トランジスタ１
２１〜１２３のベースにはパルス発生器１４から出力さ
れるローレベルのパルス信号が周期的に入力されるよう
になっている。The bases of the transistors 121 to 123 are connected to the pulse generator 14, and the transistors 1 to 123
A low-level pulse signal output from the pulse generator 14 is periodically input to bases 21 to 123.
【００４０】セル電圧比較回路１３は、３つのコンパレ
ータ１３１〜１３３、３つの基準電圧源Ｖth1とから構
成され、コンパレータ１３１の反転入力端子は組み電池
セル２の正極端子（コネクタ２の端子TP1）に接続され
ている。またコンパレータ１３１の非反転入力端子は基
準電圧源Ｖth1の正極に接続され、基準電圧源Ｖth1の負
極は端子TP2に接続されている。The cell voltage comparison circuit 13 is composed of three comparators 131 to 133 and three reference voltage sources Vth1. The inverting input terminal of the comparator 131 is connected to the positive terminal of the assembled battery cell 2 (terminal TP1 of the connector 2). It is connected. The non-inverting input terminal of the comparator 131 is connected to the positive terminal of the reference voltage source Vth1, and the negative terminal of the reference voltage source Vth1 is connected to the terminal TP2.
【００４１】コンパレータ１３２の反転入力端子は組み
電池セル２の端子TP2に接続され、非反転入力端子は基
準電圧源Ｖth1の正極に接続され、基準電圧源Ｖth1の負
極は端子TP3に接続されている。また、コンパレータ１
３３の反転入力端子は組み電池セル２端子TP3に接続さ
れ、非反転入力端子は基準電圧源Ｖth1の正極に接続さ
れ、基準電圧源Ｖth1の負極は端子TP4に接続されてい
る。The inverting input terminal of the comparator 132 is connected to the terminal TP2 of the assembled battery cell 2, the non-inverting input terminal is connected to the positive terminal of the reference voltage source Vth1, and the negative terminal of the reference voltage source Vth1 is connected to the terminal TP3. . Also, comparator 1
The inverting input terminal 33 is connected to the assembled battery cell 2 terminal TP3, the non-inverting input terminal is connected to the positive electrode of the reference voltage source Vth1, and the negative electrode of the reference voltage source Vth1 is connected to the terminal TP4.
【００４２】また、各コンパレータ１３１〜１３３の出
力端子はコントロール回路１５に接続されている。これ
らのコンパレータ１３１〜１３３は、２次電池セル２ａ
の検出電圧が基準電圧Ｖth1よりも低いときに出力信号
をハイレベルに設定する。ここで、基準電圧Ｖth1は、
２次電池セル２ａが過放電状態になる電圧よりもやや高
い電圧に設定されている。The output terminals of the comparators 131 to 133 are connected to the control circuit 15. These comparators 131 to 133 are connected to the secondary battery cell 2a.
When the detection voltage is lower than the reference voltage Vth1, the output signal is set to the high level. Here, the reference voltage Vth1 is
The voltage is set to be slightly higher than the voltage at which the secondary battery cell 2a becomes overdischarged.
【００４３】パルス発生器１４は、各トランジスタ１２
１〜１２３のそれぞれのベースに対して同時に３つのロ
ーレベルのパルス信号を周期的に出力する。このパルス
信号のパルス幅は、前述した浮遊容量Ｃ１〜Ｃ３に保持
されている電圧を放電するのに必要十分なパルス幅に設
定されている。また、本実施形態ではパルス周期を３０
秒に設定している。The pulse generator 14 controls each transistor 12
Three low-level pulse signals are simultaneously periodically output to the respective bases 1 to 123 at the same time. The pulse width of this pulse signal is set to a pulse width necessary and sufficient to discharge the voltage held in the above-mentioned stray capacitances C1 to C3. In this embodiment, the pulse period is set to 30.
Set to seconds.
【００４４】さらに、パルス発生器１４は、各トランジ
スタ１２１〜１２３にパルスを出力し終えた直後に、コ
ントロール回路１５に対してパルス信号を出力する。Further, the pulse generator 14 outputs a pulse signal to the control circuit 15 immediately after outputting the pulse to each of the transistors 121 to 123.
【００４５】コントロール回路１５は、パルス発生器１
４からパルス信号を入力した直後にコンパレータ１３１
〜１３３の出力信号を入力し、これら３つの信号の何れ
かがハイレベルであるときにＦＥＴ１６，１７をオフ状
態に設定する。The control circuit 15 includes the pulse generator 1
Immediately after a pulse signal is input from the comparator 4, the comparator 131
133, and when any one of these three signals is at a high level, the FETs 16 and 17 are turned off.
【００４６】ＦＥＴ１６，１７は直列接続されて正極出
力端子１８ａとコネクタ２ｂの正極端子TP1との間に接
続されている。また、ＦＥＴ１６，１７のゲートはコン
トロール回路１５に接続されている。また、負極出力端
子１８ｂは、コネクタ２ｂの負極端子TP4に接続されて
いる。これにより、ＦＥＴ１６，１７がオン状態にある
ときに、正極出力端子１８ａ及び負極出力端子１８ｂを
介して組み電池セル２から端子を介して上位装置に電力
が供給される。The FETs 16 and 17 are connected in series and connected between the positive output terminal 18a and the positive terminal TP1 of the connector 2b. The gates of the FETs 16 and 17 are connected to the control circuit 15. The negative output terminal 18b is connected to the negative terminal TP4 of the connector 2b. Thus, when the FETs 16 and 17 are in the ON state, power is supplied from the assembled battery cell 2 to the host device via the positive electrode output terminal 18a and the negative electrode output terminal 18b via the terminal.
【００４７】また、セル電圧比較回路１３の入力側、即
ちコンパレータ１３１〜１３３の入力側は、２次電池セ
ル２ａの電力消費を避けるために非常に高いインピーダ
ンスに設定されている。このため、各コンパレータ１３
１〜１３３の入力側には、それぞれ浮遊容量Ｃ１〜Ｃ３
が発生する。The input side of the cell voltage comparison circuit 13, that is, the input side of the comparators 131 to 133, is set to a very high impedance in order to avoid power consumption of the secondary battery cell 2a. Therefore, each comparator 13
Stray capacitances C1 to C3
Occurs.
【００４８】前述の構成では、コントロール回路１５の
保護動作は、パルス発生器１４から各トランジスタ１２
１〜１２３に対してパルスが出力されてから行われる。
このため、上記浮遊容量Ｃ１〜Ｃ３の影響を受けること
なく２次電池セル２ａの端子間電圧を検出して過放電に
対する保護動作が実行される。さらに、組み電池セル２
と保護回路１１とを接続するコネクタ２ｂの何れかの端
子TP1〜TP4が接触不良などにより非導通状態になってい
るときにも、２次電池セル２ａの劣化や破壊等を防止す
るために上記の保護動作が実行される。In the configuration described above, the protection operation of the control circuit 15 is performed by the pulse generator 14
This is performed after the pulses are output to 1 to 123.
For this reason, the protection operation against overdischarge is executed by detecting the voltage between the terminals of the secondary battery cell 2a without being affected by the stray capacitances C1 to C3. Further, the assembled battery cell 2
When any one of the terminals TP1 to TP4 of the connector 2b connecting the protection battery 11 and the protection circuit 11 is in a non-conductive state due to a contact failure or the like, the above-described operation is performed to prevent the secondary battery cell 2a from being deteriorated or destroyed. Is performed.
【００４９】即ち、放電回路１２によってセル電圧比較
回路１３のコンパレータ１３１〜１３３の入力端子を所
定時間短絡することにより、上記浮遊容量Ｃ１〜Ｃ３に
保持されていた電圧を放電した後、放電回路１２による
短絡を解除することにより、２次電池セル２ａとセル電
圧比較回路１３との間が導通状態にあればコンパレータ
１３１〜１３３には２次電池セル２ａの検出電圧が印加
され、過放電状態の正常な検出が行われる。That is, by shorting the input terminals of the comparators 131 to 133 of the cell voltage comparison circuit 13 for a predetermined time by the discharge circuit 12, the voltage held in the stray capacitances C1 to C3 is discharged. When the short circuit is released, the detection voltage of the secondary battery cell 2a is applied to the comparators 131 to 133 if the connection between the secondary battery cell 2a and the cell voltage comparison circuit 13 is in a conductive state, and the over-discharge state is established. Normal detection is performed.
【００５０】また、放電回路１２による短絡を解除した
後にコンパレータ１３１〜１３３の入力端子電圧がほぼ
短絡状態の電圧であるときは、２次電池セル２ａとコン
パレータ１３１〜１３３の入力端子との間が非導通状態
にあり正常な検出ができなかったものと判断され、２次
電池セル２ａと上位装置との間はＦＥＴ１６，１７をオ
フ状態にすることにより非導通状態に設定される。When the input terminal voltages of the comparators 131 to 133 are almost in a short-circuit state after the short circuit by the discharge circuit 12 is released, the voltage between the secondary battery cell 2a and the input terminals of the comparators 131 to 133 is low. It is determined that normal detection was not possible due to the non-conductive state, and the non-conductive state is set by turning off the FETs 16 and 17 between the secondary battery cell 2a and the host device.
【００５１】尚、前述した保護回路１１と過充電防止機
能を有する保護回路を組み合わせても、上記本願発明の
効果を得ることができる。The effect of the present invention can be obtained by combining the protection circuit 11 described above with a protection circuit having an overcharge prevention function.
【００５２】次に、本発明の第２の実施形態を説明す
る。Next, a second embodiment of the present invention will be described.
【００５３】図５は、第２の実施形態における電源装置
であるバッテリーパック２０を示す回路図である。図に
おいて、前述した第１の実施形態と同一構成部分は同一
符号をもって表しその説明を省略する。また、第２の実
施形態と第１の実施形態との相違点は、第１の実施形態
の放電回路１２における最も正極側に位置する２次電池
セル２ａに対応したトランジスタ１２１及び抵抗器１２
４を除去したことである。FIG. 5 is a circuit diagram showing a battery pack 20 which is a power supply device according to the second embodiment. In the figure, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. Further, the difference between the second embodiment and the first embodiment is that the transistor 121 and the resistor 12 corresponding to the secondary battery cell 2a located on the most positive side in the discharge circuit 12 of the first embodiment are different from the first embodiment.
4 was removed.
【００５４】即ち、第２の実施形態の保護回路２１は、
放電回路２２、セル電圧比較回路１３、パルス発生器１
４、コントロール回路１５、及び電界効果トランジスタ
（以下、ＦＥＴと称する）１６，１７から構成されてい
る。That is, the protection circuit 21 of the second embodiment
Discharge circuit 22, cell voltage comparison circuit 13, pulse generator 1
4, a control circuit 15, and field effect transistors (hereinafter, referred to as FETs) 16, 17.
【００５５】放電回路２２は、２つのＰＮＰ型トランジ
スタ１２２，１２３及び２つの抵抗器１２５，１２６か
ら構成され、トランジスタと抵抗器の直列回路が２組形
成され、これら２組の直列回路のそれぞれは、コネクタ
２ｂの端子TP2とTP3との間、端子TP3とTP4との間に接続
されている。The discharge circuit 22 is composed of two PNP transistors 122 and 123 and two resistors 125 and 126, and two sets of series circuits of transistors and resistors are formed. Each of these two sets of series circuits is Are connected between the terminals TP2 and TP3 and between the terminals TP3 and TP4 of the connector 2b.
【００５６】また、各トランジスタ１２２，１２３のベ
ースはパルス発生器１４に接続され、各トランジスタ１
２２，１２３のベースにはパルス発生器１４から出力さ
れるローレベルのパルス信号が周期的に入力されるよう
になっている。The bases of the transistors 122 and 123 are connected to the pulse generator 14 and
Low-level pulse signals output from the pulse generator 14 are periodically input to bases 22 and 123.
【００５７】上記構成以外は前述した第１の実施形態と
同じである。The configuration other than the above is the same as that of the first embodiment.
【００５８】上記構成のバッテリーパック２０では、組
み電池セル２における最も正極側に位置する２次電池セ
ル２ａの正極端子は、コネクタ２ｂの端子TP1を介して
正極出力端子１８ａ及び保護回路２１に接続されるた
め、コネクタ２ｂの正極端子TP1及び負極端子TP4に接続
不良が生じた場合、正極出力端子１８ａを介して接続さ
れる上位装置との間も非導通状態になる。このため、コ
ネクタ２ｂの正極端子TP1の接続不良は容易に発見可能
である。In the battery pack 20 having the above configuration, the positive terminal of the secondary battery cell 2a located on the most positive side of the assembled battery cell 2 is connected to the positive output terminal 18a and the protection circuit 21 via the terminal TP1 of the connector 2b. Therefore, if a connection failure occurs between the positive terminal TP1 and the negative terminal TP4 of the connector 2b, the connection with the higher-level device connected via the positive output terminal 18a is also made non-conductive. For this reason, the connection failure of the positive electrode terminal TP1 of the connector 2b can be easily found.
【００５９】従って、コネクタ２ｂの正極端子TP1及び
負極端子TP4以外の端子TP2,TP3の接続不良を検出するこ
とで、接続不良による過放電を回避することができる。Accordingly, by detecting the connection failure of the terminals TP2 and TP3 other than the positive terminal TP1 and the negative terminal TP4 of the connector 2b, it is possible to avoid overdischarge due to the connection failure.
【００６０】即ち、トランジスタ１２２，１２３がディ
スクリート部品である場合でも、トランジスタの数を減
らすことができ、本発明の電源装置の小型化も可能とな
る。That is, even when the transistors 122 and 123 are discrete components, the number of transistors can be reduced, and the power supply device of the present invention can be downsized.
【００６１】尚、前述した保護回路２１と過充電防止機
能を有する保護回路を組み合わせても、上記本願発明の
効果を得ることができる。The effect of the present invention can be obtained by combining the protection circuit 21 described above with a protection circuit having an overcharge prevention function.
【００６２】次に、本発明の第３の実施形態を説明す
る。Next, a third embodiment of the present invention will be described.
【００６３】図６は、第３の実施形態における電源装置
であるバッテリーパック３０を示す回路図である。図に
おいて、前述した第１の実施形態と同一構成部分は同一
符号をもって表しその説明を省略する。また、第３の実
施形態と第１の実施形態との相違点は、第１の実施形態
のセル電圧比較回路１３に代えて過放電及び過充電を検
出可能なセル電圧比較回路３３を設けると共に、過放電
状態及び過充電状態を検出したときにＦＥＴ１６，１７
をオフ状態に設定するコントロール回路３５を設けた保
護回路３１を備えたことである。この構成によって過放
電防止に加えて過充電防止の機能を備えた。FIG. 6 is a circuit diagram showing a battery pack 30 as a power supply device according to the third embodiment. In the figure, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. The third embodiment is different from the first embodiment in that a cell voltage comparison circuit 33 capable of detecting overdischarge and overcharge is provided instead of the cell voltage comparison circuit 13 of the first embodiment. When the overdischarge state and the overcharge state are detected, the FETs 16 and 17
Is provided with a protection circuit 31 provided with a control circuit 35 for setting the switch to the off state. With this configuration, an overcharge prevention function is provided in addition to overdischarge prevention.
【００６４】即ち、セル電圧比較回路３３は、６つのコ
ンパレータ３３１〜３３６、３つの基準電圧源Ｖth2及
び１２個の抵抗器Ｒ１〜Ｒ１２から構成されている。That is, the cell voltage comparison circuit 33 is composed of six comparators 331 to 336, three reference voltage sources Vth2, and twelve resistors R1 to R12.
【００６５】コンパレータ３３１及びコンパレータ３３
２の非反転入力端子は基準電圧源Ｖth2の正極に接続さ
れ、基準電圧源Ｖth2の負極は端子TP2に接続されてい
る。The comparator 331 and the comparator 33
The non-inverting input terminal 2 is connected to the positive terminal of the reference voltage source Vth2, and the negative terminal of the reference voltage source Vth2 is connected to the terminal TP2.
【００６６】コンパレータ３３３及びコンパレータ３３
４の非反転入力端子は基準電圧源Ｖth2の正極に接続さ
れ、基準電圧源Ｖth2の負極は端子TP3に接続されてい
る。コンパレータ３３５及びコンパレータ３３６の非反
転入力端子は基準電圧源Ｖth2の正極に接続され、基準
電圧源Ｖth2の負極は端子TP4に接続されている。The comparator 333 and the comparator 33
The non-inverting input terminal 4 is connected to the positive terminal of the reference voltage source Vth2, and the negative terminal of the reference voltage source Vth2 is connected to the terminal TP3. The non-inverting input terminals of the comparators 335 and 336 are connected to the positive terminal of the reference voltage source Vth2, and the negative terminal of the reference voltage source Vth2 is connected to the terminal TP4.
【００６７】抵抗器Ｒ１と抵抗器Ｒ２は直列接続されて
分圧回路を形成し、コネクタ２ｂの正極端子TP1と端子T
P2との間に接続され、これらの抵抗器Ｒ１，Ｒ２の接続
点はコンパレータ３３１の反転入力端子に接続されてい
る。The resistor R1 and the resistor R2 are connected in series to form a voltage dividing circuit, and the positive terminal TP1 and the terminal T of the connector 2b are connected.
The connection point of the resistors R1 and R2 is connected to the inverting input terminal of the comparator 331.
【００６８】抵抗器Ｒ３と抵抗器Ｒ４は直列接続されて
分圧回路を形成しコネクタ２ｂの正極端子TP1と端子TP2
との間に接続され、これらの抵抗器Ｒ３，Ｒ４の接続点
はコンパレータ３３２の反転入力端子に接続されてい
る。The resistor R3 and the resistor R4 are connected in series to form a voltage dividing circuit, and the positive terminal TP1 and the terminal TP2 of the connector 2b are connected.
And the connection point of these resistors R3 and R4 is connected to the inverting input terminal of the comparator 332.
【００６９】抵抗器Ｒ５と抵抗器Ｒ６は直列接続されて
分圧回路を形成しコネクタ２ｂの正極端子TP2と端子TP3
との間に接続され、これらの抵抗器Ｒ５，Ｒ６の接続点
はコンパレータ３３３の反転入力端子に接続されてい
る。The resistor R5 and the resistor R6 are connected in series to form a voltage dividing circuit, and the positive terminal TP2 and the terminal TP3 of the connector 2b are connected.
And the connection point of these resistors R5 and R6 is connected to the inverting input terminal of the comparator 333.
【００７０】抵抗器Ｒ７と抵抗器Ｒ８は直列接続されて
分圧回路を形成しコネクタ２ｂの正極端子TP2と端子TP3
との間に接続され、これらの抵抗器Ｒ７，Ｒ８の接続点
はコンパレータ３３４の反転入力端子に接続されてい
る。The resistor R7 and the resistor R8 are connected in series to form a voltage dividing circuit, and the positive terminal TP2 and the terminal TP3 of the connector 2b are connected.
And the connection point of these resistors R7 and R8 is connected to the inverting input terminal of the comparator 334.
【００７１】抵抗器Ｒ９と抵抗器Ｒ１０は直列接続され
て分圧回路を形成しコネクタ２ｂの正極端子TP3と端子T
P4との間に接続され、これらの抵抗器Ｒ９，Ｒ１０の接
続点はコンパレータ３３５の反転入力端子に接続されて
いる。The resistor R9 and the resistor R10 are connected in series to form a voltage dividing circuit, and the positive terminal TP3 and the terminal T of the connector 2b are connected.
The connection point of the resistors R9 and R10 is connected to the inverting input terminal of the comparator 335.
【００７２】抵抗器Ｒ１１と抵抗器Ｒ１２は直列接続さ
れて分圧回路を形成しコネクタ２ｂの正極端子TP3と端
子TP4との間に接続され、これらの抵抗器Ｒ１１，Ｒ１
２の接続点はコンパレータ３３６の反転入力端子に接続
されている。The resistor R11 and the resistor R12 are connected in series to form a voltage dividing circuit and are connected between the positive terminal TP3 and the terminal TP4 of the connector 2b, and these resistors R11 and R1 are connected.
The connection point 2 is connected to the inverting input terminal of the comparator 336.
【００７３】ここで、コンパレータ３３１，３３３，３
３５は過放電検出に用いられ、コンパレータ３３２，３
３４，３３６は過充電検出に用いられる。Here, the comparators 331, 333, 3
35 is used for over-discharge detection, and the comparators 332, 3
Reference numerals 34 and 336 are used for overcharge detection.
【００７４】また、抵抗器を２つ一組にした上記各分圧
回路の抵抗値は、コンパレータ３３１，３３３，３３５
に対応した過放電検出に用いられるものでは、分圧した
電圧が通常時において基準電圧Ｖth2よりも高く、過放
電時において基準電圧Ｖth2よりも低くなるような値に
設定されている。同様に、コンパレータ３３２，３３
４，３３６に対応した過充電検出に用いられるもので
は、分圧した電圧が通常時において基準電圧Ｖth2より
も低く、過充電時において基準電圧Ｖth2よりも高くな
るような値に設定されている。The resistance value of each of the above voltage dividing circuits having two resistors is set by the comparators 331, 333, and 335.
Is used for overdischarge detection corresponding to the above, the divided voltage is set to a value that is higher than the reference voltage Vth2 during normal times and lower than the reference voltage Vth2 during overdischarge. Similarly, comparators 332 and 33
In the overcharge detection corresponding to 4,336, the divided voltage is set to a value that is lower than the reference voltage Vth2 during normal operation and higher than the reference voltage Vth2 during overcharge.
【００７５】上記設定により、過放電検出用のコンパレ
ータ３３１，３３３，３３５の出力信号は、通常時にロ
ーレベルとなり、過放電時にローレベルとなる。また、
過充電検出用のコンパレータ３３２，３３４，３３６の
出力信号は、通常時にハイレベルとなり、過充電時にハ
イレベルとなる。また、各コンパレータ３３１〜３３６
の出力端子はコントロール回路３５に接続されている。With the above settings, the output signals of the comparators 331, 333, and 335 for overdischarge detection become low level during normal operation, and become low level during overdischarge. Also,
The output signals of the comparators 332, 334, and 336 for overcharge detection are at a high level during normal operation, and are at a high level during overcharge. Further, each of the comparators 331 to 336
Are connected to the control circuit 35.
【００７６】また、セル電圧比較回路３３の入力側、即
ちコンパレータ３３１〜３３６の入力側は、２次電池セ
ル２ａの電力消費を避けるために非常に高いインピーダ
ンスに設定されている。このため、各コンパレータ３３
１〜３３６の入力側には、それぞれ浮遊容量Ｃ１〜Ｃ３
が発生する。The input side of the cell voltage comparison circuit 33, that is, the input side of the comparators 331 to 336 is set to a very high impedance in order to avoid power consumption of the secondary battery cell 2a. For this reason, each comparator 33
The input sides of 1 to 336 have stray capacitances C1 to C3, respectively.
Occurs.
【００７７】コントロール回路３５は、パルス発生器１
４からパルス信号を入力した直後にコンパレータ３３１
〜３３６の出力信号を入力し、過放電検出用コンパレー
タ３３１，３３３，３３５の何れかの出力信号がローレ
ベルのとき、及び過充電検出用コンパレータ３３２，３
３４，３３６の何れかの出力信号がハイレベルのときに
ＦＥＴ１６，１７をオフ状態に設定する。The control circuit 35 includes the pulse generator 1
Immediately after the pulse signal is input from
To 336, when any of the output signals of the overdischarge detection comparators 331, 333, 335 is at a low level, and when the overcharge detection comparators 332, 3
When any one of the output signals 34 and 336 is at the high level, the FETs 16 and 17 are set to the off state.
【００７８】上記動作により過放電及び過充電から２次
電池セル２ａを保護することができる。即ち、コントロ
ール回路３５の保護動作は、パルス発生器１４から各ト
ランジスタ１２１〜１２３に対してパルスが出力されて
から行われる。このため、上記浮遊容量Ｃ１〜Ｃ３の影
響を受けることなく２次電池セル２ａの端子間電圧を検
出して過放電に対する保護動作が実行される。The above operation can protect the secondary battery cell 2a from overdischarge and overcharge. That is, the protection operation of the control circuit 35 is performed after a pulse is output from the pulse generator 14 to each of the transistors 121 to 123. For this reason, the protection operation against overdischarge is executed by detecting the voltage between the terminals of the secondary battery cell 2a without being affected by the stray capacitances C1 to C3.
【００７９】さらに、組み電池セル２と保護回路３１と
を接続するコネクタ２ｂの何れかの端子TP1〜TP4が接触
不良などによって非導通状態になっているときにも２次
電池セル２ａの劣化や破壊等を防止するために上記の保
護動作が実行される。Further, when any one of the terminals TP1 to TP4 of the connector 2b connecting the assembled battery cell 2 and the protection circuit 31 is in a non-conductive state due to a contact failure or the like, the deterioration of the secondary battery cell 2a and The above-described protection operation is performed to prevent destruction and the like.
【００８０】即ち、放電回路１２によってセル電圧比較
回路３３のコンパレータ３３１〜３３６の入力側（分圧
抵抗回路の両端間）を所定時間短絡することにより、上
記浮遊容量Ｃ１〜Ｃ３によって保持されていた電圧を放
電した後、放電回路１２による短絡を解除することによ
り、２次電池セル２ａとセル電圧比較回路３３との間が
導通状態にあればコンパレータ３３１〜３３６には２次
電池セル２ａの検出電圧が印加され、過放電状態及び過
充電状態の正常な検出が行われる。That is, the input side (between both ends of the voltage dividing resistor circuit) of the comparators 331 to 336 of the cell voltage comparison circuit 33 is short-circuited by the discharge circuit 12 for a predetermined time, so that the data is held by the floating capacitances C1 to C3. After the voltage is discharged, the short circuit by the discharge circuit 12 is released, and if the connection between the secondary battery cell 2a and the cell voltage comparison circuit 33 is in a conductive state, the comparators 331 to 336 detect the secondary battery cell 2a. A voltage is applied, and normal detection of the overdischarge state and the overcharge state is performed.
【００８１】また、放電回路１２による短絡を解除した
後にコンパレータ３３１〜３３６の入力端子電圧がほぼ
短絡状態の電圧であるときは、過放電検出用のコンパレ
ータ３３１、３３３，３３５によって２次電池セル２ａ
との間が非導通状態にあり正常な検出ができなかったも
のと判断され、２次電池セル２ａと上位装置との間はＦ
ＥＴ１６，１７をオフ状態にすることにより非導通状態
に設定される。When the input terminal voltages of the comparators 331 to 336 are almost in a short-circuit state after the short circuit by the discharge circuit 12 is released, the comparators 331, 333, and 335 for detecting over-discharge detect the secondary battery cell 2a.
Between the secondary battery cell 2a and the host device is determined to be non-conductive and normal detection could not be performed.
The non-conductive state is set by turning off the ETs 16 and 17.
【００８２】次に、本発明の第４の実施形態を説明す
る。Next, a fourth embodiment of the present invention will be described.
【００８３】図７は、第４の実施形態における電源装置
であるバッテリーパック４０を示す回路図である。図に
おいて、前述した第３の実施形態と同一構成部分は同一
符号をもって表しその説明を省略する。また、第４の実
施形態と第３の実施形態との相違点は、第３の実施形態
の放電回路１２における最も正極側に位置する２次電池
セル２ａに対応したトランジスタ１２１及び抵抗器１２
４を除去したことである。FIG. 7 is a circuit diagram showing a battery pack 40 which is a power supply device according to the fourth embodiment. In the figure, the same components as those in the third embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. The difference between the fourth embodiment and the third embodiment is that the transistor 121 and the resistor 12 corresponding to the secondary battery cell 2a located on the most positive side in the discharge circuit 12 of the third embodiment are different from the fourth embodiment.
4 was removed.
【００８４】即ち、第４の実施形態の保護回路４１は、
放電回路２２、セル電圧比較回路３３、パルス発生器１
４、コントロール回路３５、及び電界効果トランジスタ
（以下、ＦＥＴと称する）１６，１７から構成されてい
る。That is, the protection circuit 41 of the fourth embodiment comprises:
Discharge circuit 22, cell voltage comparison circuit 33, pulse generator 1
4, a control circuit 35, and field effect transistors (hereinafter, referred to as FETs) 16 and 17.
【００８５】放電回路２２は、前述した第２の実施形態
における放電回路と同じ構成であり、２つのＰＮＰ型ト
ランジスタ１２２，１２３及び２つの抵抗器１２５，１
２６から構成され、トランジスタと抵抗器の直列回路が
２組形成され、これら２組の直列回路のそれぞれは、コ
ネクタ２ｂの端子TP2とTP3との間、端子TP3とTP4との間
に接続されている。The discharging circuit 22 has the same configuration as the discharging circuit in the second embodiment described above, and includes two PNP transistors 122 and 123 and two resistors 125 and 1.
26, two sets of series circuits of transistors and resistors are formed, each of which is connected between the terminals TP2 and TP3 and between the terminals TP3 and TP4 of the connector 2b. I have.
【００８６】また、各トランジスタ１２２，１２３のベ
ースはパルス発生器１４に接続され、各トランジスタ１
２２，１２３のベースにはパルス発生器１４から出力さ
れるローレベルのパルス信号が周期的に入力されるよう
になっている。The base of each of the transistors 122 and 123 is connected to the pulse generator 14 and
Low-level pulse signals output from the pulse generator 14 are periodically input to bases 22 and 123.
【００８７】上記構成以外は前述した第３の実施形態と
同じである。Except for the above configuration, the third embodiment is the same as the third embodiment.
【００８８】上記構成のバッテリーパック４０では、組
み電池セル２における最も正極側に位置する２次電池セ
ル２ａの正極端子は、コネクタ２ｂの端子TP1を介して
正極出力端子１８ａ及び保護回路４１に接続されるた
め、コネクタ２ｂの正極端子TP1に接続不良が生じた場
合、正極出力端子１８ａを介して接続される上位装置と
の間も非導通状態になる。このため、コネクタ２ｂの正
極端子TPの接続不良は容易に発見可能である。In the battery pack 40 having the above structure, the positive terminal of the secondary battery cell 2a located at the most positive side in the assembled battery cell 2 is connected to the positive output terminal 18a and the protection circuit 41 via the terminal TP1 of the connector 2b. Therefore, if a connection failure occurs in the positive terminal TP1 of the connector 2b, the connection with the host device connected via the positive output terminal 18a also becomes non-conductive. For this reason, the connection failure of the positive electrode terminal TP of the connector 2b can be easily found.
【００８９】従って、コネクタ２ｂの正極端子TP1及び
負極端子TP4以外の端子TP2,TP3の接続不良を検出するこ
とで、接続不良による過放電及び過充電を回避すること
ができる。Therefore, by detecting the connection failure of the terminals TP2 and TP3 other than the positive terminal TP1 and the negative terminal TP4 of the connector 2b, overdischarge and overcharge due to the connection failure can be avoided.
【００９０】尚、放電回路１２，２２のトランジスタ１
２１〜１２３に代えてＦＥＴや電子制御式のスイッチを
用いても良い。The transistors 1 of the discharge circuits 12 and 22
An FET or an electronically controlled switch may be used instead of 21 to 123.
【００９１】また、上記実施形態の構成は、本願発明の
一具体例を示すものであり、本願発明がこれらの構成の
みに限定されるものではない。Further, the configuration of the above embodiment is a specific example of the present invention, and the present invention is not limited to only these configurations.
【００９２】[0092]
【発明の効果】以上説明したように本発明の請求項１及
び２記載の組み電池セルの接続不良検出方法によれば、
保護回路の入力側インピーダンスが高く設定され、これ
によって生じる浮遊容量によって検出電圧が保持されや
すい場合にも、２次電池セルの端子間電圧を正確に検出
することができる。このため、直列接続された２つ以上
の２次電池セルの端子と保護回路との間が接続不良や接
触不良によって非導通状態になったときにも、これを検
出できるので、２次電池セルの過放電或いは過充電によ
る劣化や破壊を防止することができる。As described above, according to the method for detecting the connection failure of the assembled battery cell according to the first and second aspects of the present invention,
Even when the input impedance of the protection circuit is set high and the detection voltage is easily held by the stray capacitance generated thereby, the voltage between the terminals of the secondary battery cell can be accurately detected. For this reason, even when the connection between the terminals of the two or more secondary battery cells connected in series and the protection circuit becomes non-conductive due to poor connection or poor contact, this can be detected. Can be prevented from being deteriorated or destroyed due to overdischarging or overcharging.
【００９３】また、請求項３乃至請求項６記載の電源装
置によれば、保護回路の入力側インピーダンスが高く設
定され、これによって生じる浮遊容量によって検出電圧
が保持されやすい構成においても、２次電池セルの端子
間電圧を比較的正確に検出することができる。このた
め、直列接続された２つ以上の２次電池セルの端子と保
護回路との間が接続不良や接触不良によって非導通状態
になったときにも、即座にこれを検出できるので、２次
電池セルの過放電或いは過充電による劣化や破壊を防止
することができる。According to the power supply device of the present invention, the input impedance of the protection circuit is set high, so that the detection voltage is easily held by the stray capacitance generated by the protection circuit. The voltage between the terminals of the cell can be detected relatively accurately. For this reason, even when the connection between the terminals of two or more secondary battery cells connected in series and the protection circuit becomes non-conductive due to poor connection or poor contact, this can be detected immediately. Deterioration or destruction due to overdischarge or overcharge of the battery cell can be prevented.
【図１】本発明の第１の実施形態における電源装置とし
てのバッテリーパックを示す回路図FIG. 1 is a circuit diagram showing a battery pack as a power supply device according to a first embodiment of the present invention.
【図２】従来例における電源装置としてのバッテリーパ
ックを示す回路図FIG. 2 is a circuit diagram showing a battery pack as a power supply device in a conventional example.
【図３】従来例における組み電池セルを示す外観斜視図FIG. 3 is an external perspective view showing an assembled battery cell in a conventional example.
【図４】従来例における問題点を説明する図FIG. 4 is a diagram illustrating a problem in a conventional example.
【図５】本発明の第２の実施形態における電源装置とし
てのバッテリーパックを示す回路図FIG. 5 is a circuit diagram showing a battery pack as a power supply device according to a second embodiment of the present invention.
【図６】本発明の第３の実施形態における電源装置とし
てのバッテリーパックを示す回路図FIG. 6 is a circuit diagram showing a battery pack as a power supply device according to a third embodiment of the present invention.
【図７】本発明の第４の実施形態における電源装置とし
てのバッテリーパックを示す回路図FIG. 7 is a circuit diagram showing a battery pack as a power supply device according to a fourth embodiment of the present invention.
１，１０，２０，３０，４０…バッテリーパック（電源
装置）、２…組み電池セル、２ａ…２次電池セル、２ｂ
…コネクタ、２ｃ…固定部材、３，１１，２１，３１，
４１…保護回路、３ａ，１２，２２…放電回路、３ｂ，
１３，３３…セル電圧比較回路、３ｃ，１５，３５…コ
ントロール回路、３ｄ，３ｅ，１６，１７…電界効果ト
ランジスタ（ＦＥＴ）、４ａ，１８ａ…正極出力端子、
４ｂ，１８ｂ…負極出力端子、１４…パルス発生器、Ｔ
r1〜Ｔr3…トランジスタ、Ｒａ〜Ｒｃ…抵抗器、Ｑ１〜
Ｑ３…コンパレータ、Ｖth，Ｖth1，Ｖth2…基準電圧
源。1, 10, 20, 30, 40: battery pack (power supply device), 2: assembled battery cell, 2a: secondary battery cell, 2b
... Connector, 2c ... Fixing member, 3, 11, 21, 31,
41 protection circuit, 3a, 12, 22 discharge circuit, 3b,
13, 33 ... cell voltage comparison circuit, 3c, 15, 35 ... control circuit, 3d, 3e, 16, 17 ... field effect transistor (FET), 4a, 18a ... positive electrode output terminal,
4b, 18b: negative output terminal, 14: pulse generator, T
r1 to Tr3: transistors, Ra to Rc: resistors, Q1
Q3: comparator, Vth, Vth1, Vth2: reference voltage source.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2G014 AA02 AA03 AA13 AB61 AC08 2G016 CA04 CB05 CB22 CB32 CC01 CC04 CC07 CC09 CC12 CC23 CD04 CD06 CD14 5G003 AA01 BA03 CC02 CC04 DA04 DA13 EA09 FA04 FA07 GA01 5H030 AA03 AA04 FF43 FF44 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)
Claims (6)
と、各２次電池セル毎に設けられ２次電池セルの両端子
のそれぞれに接続される検出端子を有し該検出端子間の
電圧に基づいて各２次電池セルの過充電或いは過放電の
少なくとも一方を検出する検出手段とを備えた電源装置
における組み電池セルの接続不良検出方法であって、 前記２次電池セルの端子間電圧を入力する前記検出端子
間を所定時間短絡した後に、２次電池セルの過充電或い
は過放電の少なくとも一方を検出すると共に、前記検出
端子の短絡を解除した後に所定時間経過しても前記検出
電圧がほぼ短絡状態の電圧であるときに、前記２次電池
セルと前記検出端子との間が非導通状態にあると判断す
ることを特徴とする組み電池セルの接続不良検出方法。1. A battery comprising: two or more secondary battery cells connected in series; and detection terminals provided for each of the secondary battery cells and connected to both terminals of the secondary battery cells. Detection means for detecting at least one of overcharge or overdischarge of each of the secondary battery cells based on the voltage of the secondary battery cells. After short-circuiting between the detection terminals for inputting the inter-voltage for a predetermined time, at least one of overcharging and overdischarging of the secondary battery cell is detected. When the detected voltage is substantially a short-circuited voltage, it is determined that the secondary battery cell and the detection terminal are in a non-conductive state.
を短絡することを特徴とする請求項１記載の組み電池セ
ルの接続不良検出方法。2. The method according to claim 1, wherein the detection terminal is short-circuited using a switching element.
の２次電池セルの各両端子のそれぞれに接続される検出
端子を有し該端子間電圧を検出し該検出結果に基づいて
各２次電池セルの過充電状態或いは過放電状態を検知
し、前記２次電池セルに対する充電制御及び放電制御の
少なくとも一方を行い前記２次電池セルを保護する保護
回路とを備えた電源装置において、 各２次電池セルに対応した前記検出端子間に接続された
スイッチング素子と、 前記スイッチング素子を周期的に所定時間オン状態に切
り替える切替制御手段とを備え、 前記保護回路は、前記スイッチング素子がオン状態から
オフ状態に設定されてから該スイッチング素子に並列接
続されている２次電池セルの端子間電圧を検出し、該検
出電圧がほぼ短絡状態の電圧であるときに前記２次電池
セルと上位装置への接続端子との間を非導通状態に設定
する手段を備えていることを特徴とする電源装置。3. A detection terminal connected to each of both terminals of two or more rechargeable battery cells connected in series to be connected, detecting a voltage between the terminals, and detecting each voltage based on the detection result. A power supply device comprising: a protection circuit that detects an overcharged state or an overdischarged state of the secondary battery cell and performs at least one of charge control and discharge control on the secondary battery cell to protect the secondary battery cell. A switching element connected between the detection terminals corresponding to the respective secondary battery cells; and switching control means for periodically switching the switching element to an ON state for a predetermined time, wherein the protection circuit is configured such that the switching element is ON. When the terminal voltage of the secondary battery cell connected in parallel with the switching element is detected after the state is set to the off state, and the detected voltage is almost the short-circuited voltage. And a means for setting a non-conductive state between the secondary battery cell and a connection terminal to a higher-level device.
と、各二次電池セルの両端子のそれぞれに接続される検
出端子を有し該端子間電圧を検出し該検出結果に基づい
て各二次電池セルの過充電状態或いは過放電状態を検知
し、前記二次電池セルに対する充電制御及び放電制御の
少なくとも一方を行い前記二次電池セルを保護する保護
回路とを備えた電源装置において、 各二次電池セルに対応した検出端子間に接続されたスイ
ッチング素子と、 前記スイッチング素子を周期的に所定時間オン状態に切
り替える切替制御手段とを備えると共に、 前記保護回路は、前記スイッチング素子がオン状態から
オフ状態に設定されてから該スイッチング素子に並列接
続されている二次電池セルの端子間電圧を検出し、該検
出電圧がほぼ短絡状態の電圧であるときに前記二次電池
セルと上位装置への接続端子との間を非導通状態に設定
する手段を備え、 前記直列接続された２つ以上の２次電池セルは、各２次
電池セルの各端子に接続された複数の接続端子を有する
と共に該接続端子と前記切替手段及び保護回路とが接続
されていることを特徴とする電源装置。4. It has two or more secondary battery cells connected in series, and a detection terminal connected to each of both terminals of each secondary battery cell, detects a voltage between the terminals, and based on the detection result. A power supply device that detects an overcharged state or an overdischarged state of each secondary battery cell and performs at least one of charge control and discharge control on the secondary battery cell to protect the secondary battery cell. A switching element connected between detection terminals corresponding to the respective secondary battery cells, and switching control means for periodically switching the switching element to an on state for a predetermined time; and the protection circuit includes the switching element. Is set from the on state to the off state, and then the voltage between the terminals of the secondary battery cells connected in parallel to the switching element is detected, and the detected voltage is almost the short-circuit state voltage. Means for setting a non-conductive state between the secondary battery cell and a connection terminal to a higher-level device when the secondary battery cell is connected to the host device. A power supply device comprising: a plurality of connection terminals connected to each terminal; and the connection terminals are connected to the switching means and the protection circuit.
く他の２次電池セルに対応した検出端子のみに前記スイ
ッチング素子が接続されていることを特徴とする請求項
３又は４記載の電源装置。5. The switching element according to claim 3, wherein the switching element is connected only to a detection terminal corresponding to another secondary battery cell excluding the secondary battery cell located closest to the positive electrode side. Power supply.
入力して該パルス信号のパルス幅の間のみオン状態を維
持するものであり、 前記切替制御手段は、各スイッチング素子に対して周期
的に前記パルス信号を出力する手段を有することを特徴
とする請求項３記載の電源装置。6. The switching element receives a pulse signal and maintains an ON state only during a pulse width of the pulse signal, and the switching control means periodically controls the switching element for each switching element. The power supply device according to claim 3, further comprising means for outputting a pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33239499A JP2001157367A (en) | 1999-11-24 | 1999-11-24 | Method of detecting poor connection of cells in battery pack and power supply unit therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33239499A JP2001157367A (en) | 1999-11-24 | 1999-11-24 | Method of detecting poor connection of cells in battery pack and power supply unit therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001157367A true JP2001157367A (en) | 2001-06-08 |
Family
ID=18254490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33239499A Withdrawn JP2001157367A (en) | 1999-11-24 | 1999-11-24 | Method of detecting poor connection of cells in battery pack and power supply unit therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001157367A (en) |
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-
1999
- 1999-11-24 JP JP33239499A patent/JP2001157367A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
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