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JPH0919071A - Overdischarge preventive device for rechargeable battery and battery pack using the device - Google Patents

Overdischarge preventive device for rechargeable battery and battery pack using the device

Info

Publication number
JPH0919071A
JPH0919071A JP7165725A JP16572595A JPH0919071A JP H0919071 A JPH0919071 A JP H0919071A JP 7165725 A JP7165725 A JP 7165725A JP 16572595 A JP16572595 A JP 16572595A JP H0919071 A JPH0919071 A JP H0919071A
Authority
JP
Japan
Prior art keywords
battery
circuit
discharge
overdischarge
rechargeable battery
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.)
Pending
Application number
JP7165725A
Other languages
Japanese (ja)
Inventor
Yasuhisa Higashijima
泰久 東島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsumi Electric Co Ltd
Original Assignee
Mitsumi Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsumi Electric Co Ltd filed Critical Mitsumi Electric Co Ltd
Priority to JP7165725A priority Critical patent/JPH0919071A/en
Publication of JPH0919071A publication Critical patent/JPH0919071A/en
Pending legal-status Critical Current

Links

Classifications

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

Landscapes

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

Abstract

PURPOSE: To provide a general-purpose overdischarge preventive unit used for a rechargeable battery and adaptive to large and small loads easily. CONSTITUTION: An overdischarge preventive device includes a switch circuit 20 for stopping power feeding from a battery 100 to a load 200 through detection by an overdischarge detecting circuit 10, and a power short circuit preventive circuit for discharging power only when a given potential is given to a charging control element(CE).

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、充電可能な電池、例え
ば、リチウムイオン電池を備えた電池ユニットに用いら
れ、電池の過放電を検出して該電池を保護する電池の過
放電防止装置に関し、特に、端子ショートに対する防止
を行う電池の過放電防止装置及びこれを用いた電池パッ
クに関にする。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery overdischarge prevention device which is used in a battery unit equipped with a rechargeable battery, for example, a lithium ion battery, and which detects the battery overdischarge and protects the battery. In particular, the present invention relates to a battery overdischarge prevention device for preventing terminal short circuit and a battery pack using the same.

【0002】[0002]

【従来の技術】充電可能な電池のうち、特にリチウムイ
オン電池は、過放電に弱いため、過放電状態を検出して
放電を禁止する過放電防止装置が不可欠である。
2. Description of the Related Art Among rechargeable batteries, especially lithium ion batteries are vulnerable to over-discharge, and therefore an over-discharge preventing device for detecting an over-discharge state and inhibiting discharge is indispensable.

【0003】図5を参照して、従来の過放電防止装置を
備えたリチウムイオン電池による電池ユニットについて
説明する。
Referring to FIG. 5, a description will be given of a battery unit including a conventional lithium-ion battery equipped with an overdischarge prevention device.

【0004】この電池ユニットでは、リチウムイオン電
池(以後、単に電池と呼ぶ)100に過放電検出回路4
10が並列に接続されている。過放電検出回路410
は、電池100の端子電圧をしきい値電圧と比較し、端
子電圧がしきい値電圧よりも低くなると過放電と判定し
て、半導体スイッチによるスイッチ420をオフとす
る。このことにより、正側負荷電流ライン450pと負
側負荷電流ライン450nとの間に接続された負荷20
0と電池100との接続を断として放電を禁止する。し
きい値電圧は、例えば、満充電時における端子電圧の数
十パーセント程度に設定される。
In this battery unit, a lithium ion battery (hereinafter simply referred to as a battery) 100 is provided with an overdischarge detection circuit 4
10 are connected in parallel. Over-discharge detection circuit 410
Compares the terminal voltage of the battery 100 with a threshold voltage, and when the terminal voltage becomes lower than the threshold voltage, it is determined to be overdischarge, and the switch 420 by the semiconductor switch is turned off. As a result, the load 20 connected between the positive load current line 450p and the negative load current line 450n is connected.
0 is disconnected from the battery 100 to prohibit discharge. The threshold voltage is set to, for example, about several tens of percent of the terminal voltage when fully charged.

【0005】尚、従来の電池ユニットは、通常、過放電
防止装置の他に、充電の際に端子電圧が所定値を越える
と充電を停止するための過充電防止装置や、過電流状態
での放電を禁止するための過電流検出回路を備えてい
る。
In addition to the over-discharge prevention device, the conventional battery unit usually includes an over-charge prevention device for stopping charging when the terminal voltage exceeds a predetermined value during charging, and an over-current protection device. An overcurrent detection circuit for inhibiting discharge is provided.

【0006】過放電検出回路410においては、電圧の
比較は図6に示すような比較回路により行われている。
この比較回路は、しきい値電圧を設定するための基準電
圧発生源ER 、ブリーダ抵抗R1、R2、検出入力側抵
抗R3、基準電圧側抵抗RG、およびコンパレータ41
1により構成されている。
In the over-discharge detection circuit 410, the comparison of voltages is performed by a comparison circuit as shown in FIG.
This comparison circuit includes a reference voltage generation source E R for setting a threshold voltage, bleeder resistors R1 and R2, a detection input side resistor R3, a reference voltage side resistor R G , and a comparator 41.
1.

【0007】[0007]

【発明が解決しようとする課題】従来のリチウムイオン
電池を用いた保護回路には、過電流保護機能を備えてい
る場合が多いが、過電流保護の主な目的は、電池パック
を保管したり持ち歩く際に端子ショートの危険性があ
り、そのような場合に大電流が流れ、発火、発熱等が起
こらないようにするためである。電池パックを使用する
機器においても内部回路のショートの可能性があり、そ
れに対しても保護できるが、前述の保管時や携帯時の危
険性の方が可能性は大きい。
A conventional protection circuit using a lithium-ion battery often has an overcurrent protection function. The main purpose of overcurrent protection is to store a battery pack or This is because there is a risk of short-circuiting the terminals when carrying the equipment, and in such a case, a large current will flow to prevent ignition and heat generation. Even in equipment using a battery pack, there is a possibility that the internal circuit may be short-circuited, and protection can be provided against this, but the above-mentioned dangers during storage and transportation are more likely.

【0008】電流検出は容量負荷へ供給する際の過渡的
な電流と過負荷(端子ショート等)とを区別するため遅
延動作が必要となる。
The current detection requires a delay operation in order to distinguish between a transient current when supplying to a capacitive load and an overload (terminal short circuit, etc.).

【0009】本発明の課題は、負荷の軽重に応じて放電
を禁止すべき電圧を変えることのできる汎用性に優れた
充電可能な電池の過放電防止装置を提供することであ
る。
SUMMARY OF THE INVENTION An object of the present invention is to provide a rechargeable battery over-discharge preventing device which is excellent in versatility and which can change the voltage at which discharging should be prohibited according to the weight of the load.

【0010】また、本発明の他の課題は、所定の電位を
与えたときのみに、放電を可能とさせることができる充
電可能な電池の過放電防止装置に関する。
Another object of the present invention relates to a rechargeable battery over-discharge prevention device capable of discharging only when a predetermined potential is applied.

【0011】[0011]

【課題を解決するための手段】本発明によれば、充電可
能な電池と負荷との間に接続され、前記電池の端子電圧
が放電を禁止すべき電圧値にまで低下したことを検出す
る電圧比較部を含む過放電検出回路と、前記過放電検出
回路の検出により前記電池から前記負荷への給電を停止
させるスイッチ回路とを有する充電可能な電池の過放電
防止装置において、放電制御端子に所定の電位を与えた
ときのみ放電を可能とする電源ショート防止回路を付加
したことを特徴とする充電可能な電池の過放電防止装置
が得られる。
According to the present invention, a voltage connected between a rechargeable battery and a load for detecting that the terminal voltage of the battery has dropped to a voltage value at which discharge should be prohibited. In an overdischarge prevention device for a rechargeable battery having an overdischarge detection circuit including a comparison unit and a switch circuit for stopping power supply from the battery to the load by detection of the overdischarge detection circuit, a predetermined discharge control terminal is provided. There is provided a rechargeable battery over-discharge prevention device, which is characterized in that a power source short-circuit prevention circuit is added to enable discharge only when a potential of 1 is applied.

【0012】[0012]

【実施例】以下、図面を参照して、本発明の一実施例に
よる充電可能な電池の過放電防止装置を説明する。図1
は、本実施例による過放電防止装置とリチウムイオン電
池とを有する電池ユニットを示す図である。この電池ユ
ニットも、従来同様、過充電防止装置や過電流検出回路
を備えるが、本発明の要旨ではないので、図示ならびに
説明は省略する。図2は、図1における過放電検出回路
と電源ショート防止回路との具体例を示す回路図であ
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overdischarge prevention device for a rechargeable battery according to an embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a diagram showing a battery unit including an overdischarge prevention device and a lithium ion battery according to the present embodiment. This battery unit also includes an overcharge prevention device and an overcurrent detection circuit as in the conventional case, but since it is not the gist of the present invention, illustration and description thereof will be omitted. FIG. 2 is a circuit diagram showing a specific example of the over-discharge detection circuit and the power supply short-circuit prevention circuit in FIG.

【0013】図1を参照して、過放電防止装置は、充電
可能なリチウムイオン電池(以後、単に電池と呼ぶ)1
00と負荷200との間に接続され、電池100の端子
+B、−B電圧が放電を禁止すべき電圧値にまで低下し
たことを検出する電圧比較部を含む過放電検出回路10
と、過放電検出回路10の検出により電池100から負
荷200への給電を停止させるスイッチ回路20とを有
し、さらに放電制御端子CEに所定の電位を与えたとき
のみ放電を可能とする電源ショート防止回路30が付加
されている。
Referring to FIG. 1, an overdischarge prevention device includes a rechargeable lithium-ion battery (hereinafter simply referred to as a battery) 1
00 and a load 200, and an overdischarge detection circuit 10 including a voltage comparison unit for detecting that the terminals + B and -B of the battery 100 have dropped to a voltage value at which discharging should be prohibited.
And a switch circuit 20 that stops the power supply from the battery 100 to the load 200 by the detection of the overdischarge detection circuit 10, and further, a power supply short circuit that enables discharging only when a predetermined potential is applied to the discharge control terminal CE. A prevention circuit 30 is added.

【0014】さらに、図2において、本電池ユニットで
は、図4に示した従来例と同様に、電池100に過放電
検出回路10が並列に接続されている。過放電検出回路
10は、電池100の端子電圧をしきい値電圧と比較
し、しきい値電圧よりも低くなると過放電と判定して、
半導体スイッチであるスイッチ20をオフすることによ
り、正側負荷電流ライン50pと負側負荷電流ライン5
0nとの間に接続された負荷200と電池100との接
続を断として放電を禁止する。
Further, in FIG. 2, in the present battery unit, the over-discharge detection circuit 10 is connected in parallel to the battery 100 as in the conventional example shown in FIG. The over-discharge detection circuit 10 compares the terminal voltage of the battery 100 with a threshold voltage, and when it is lower than the threshold voltage, determines that the battery is over-discharged.
By turning off the switch 20 which is a semiconductor switch, the positive load current line 50p and the negative load current line 5
The discharge is prohibited by disconnecting the connection between the load 100 connected to 0n and the battery 100.

【0015】過放電検出回路10は、基準電圧発生源E
R 、ブリーダ抵抗R1、R2、R3、およびコンパレー
タ11により構成されている。
The overdischarge detection circuit 10 includes a reference voltage generation source E.
It is composed of R 1 , bleeder resistors R 1, R 2, R 3 and a comparator 11.

【0016】本過放電防止装置はさらに、放電制御端子
CEに所定の電位を与えたときのみ放電を可能とさせる
電源ショート防止回路30を有している。電源ショート
防止回路30は、保管時に放電させないことによって端
子ショートに対する防止を行う。
The present over-discharge prevention device further has a power supply short-circuit prevention circuit 30 that enables discharge only when a predetermined potential is applied to the discharge control terminal CE. The power supply short-circuit prevention circuit 30 prevents terminal short-circuits by preventing discharge during storage.

【0017】図3はトランジスタのNPN(NPN,P
NPの組み合わせ)においても入力が可能な電源ショー
ト防止回路30の変形例を示している。
FIG. 3 shows a transistor NPN (NPN, P
A modified example of the power supply short-circuit prevention circuit 30 capable of inputting even in a combination of NPs is shown.

【0018】今、放電制御端子CEが1/2VCC±(V
F−α)の範囲にあれば、トランジスタのQ1 ,Q2
オフである。放電制御端子CEが外部で電池100の端
子+B又は−Bにショートされた場合、トランジスタの
1 ,Q2 がオンとなり放電を禁止する。端子+Bと放
電制御端子CEとの間、又は放電制御端子CEと端子−
Bとの間のうち一方のみに抵抗を挿入しておき他方は本
体側に付加されるようにすると、通常は放電不可の状態
になっているため、保管時におけるショート防止にな
る。
Now, the discharge control terminal CE is 1/2 V CC ± (V
In the range of F-α), the transistors Q 1 and Q 2 are off. If the discharge control terminal CE is shorted to the terminal + B or -B of the battery 100 at the outside, Q 1, Q 2 of the transistor is prohibited becomes discharge ON. Between the terminal + B and the discharge control terminal CE, or between the discharge control terminal CE and the terminal −
If a resistor is inserted into only one of B and B and the other is added to the main body side, it is normally in a state in which discharge is not possible, so that a short circuit is prevented during storage.

【0019】なお、しきい値を1/4VCC、3/4VCC
と変えることによってセット毎に異なるしきい値のもの
を用意すれば、異なるセットにおける誤使用が防止でき
る。
The threshold value is set to 1 / 4V CC , 3 / 4V CC
If different thresholds are prepared for each set by changing to, it is possible to prevent misuse in different sets.

【0020】図4は、充電可能な電池の電源ショート保
護防止装置を用いた電池パックを示している。放電制御
端子CEには、電池100の端子+B及びGND間電圧
を2つの抵抗R1、R2によって分割された電圧を入力
する。放電制御端子CEに入力された電圧が設定値の範
囲無いにある場合のみ放電可能となるため、抵抗R1、
または抵抗R2の一方を電池パック側、他方をセット側
に付加することにより正規のセットで電池を使用する場
合のみ放電可能となる。
FIG. 4 shows a battery pack using a power supply short circuit protection / prevention device for a rechargeable battery. A voltage obtained by dividing the voltage between the terminal + B and the GND of the battery 100 by the two resistors R1 and R2 is input to the discharge control terminal CE. Since the discharge is possible only when the voltage input to the discharge control terminal CE is out of the set value range, the resistance R1,
Alternatively, by adding one of the resistors R2 to the battery pack side and the other to the set side, it becomes possible to discharge only when the battery is used in a regular set.

【0021】なお、本発明では電池にかぎらず、過放電
からの保護を必要とする充電可能な電池全般に適用可能
であることはいうまでもない。
Needless to say, the present invention is applicable not only to batteries but also to all rechargeable batteries requiring protection from over-discharge.

【0022】[0022]

【発明の効果】本発明による充電可能な電池の過放電防
止装置は、放電制御端子に所定の電位を与えたときのみ
放電を可能とさせる電源ショート防止回路を備えたた
め、正規のセット以外では使用できなくなることから、
誤った使い方の防止ができる。
The rechargeable battery over-discharge prevention device according to the present invention is provided with a power supply short-circuit prevention circuit that enables discharge only when a predetermined potential is applied to the discharge control terminal, and therefore is used only in a proper set. Because it will not be possible
You can prevent wrong usage.

【0023】また、保管や持ち運び時に、端子ショート
等が発生しても放電をしないため、安全な電池パックを
提供できる。
In addition, since the battery is not discharged even if a terminal short circuit occurs during storage or transportation, a safe battery pack can be provided.

【0024】さらに、過電流検出の遅延動作を簡略で
き、汎用性に優れている。
Further, the delay operation of overcurrent detection can be simplified and the versatility is excellent.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例による充電可能な電池の過放
電防止装置が適用された電池ユニットを示すブロック構
成図である。
FIG. 1 is a block diagram showing a battery unit to which an overdischarge prevention device for a rechargeable battery according to an exemplary embodiment of the present invention is applied.

【図2】図1の電池ユニットの具体例を示すブロック構
成図である。
FIG. 2 is a block diagram showing a specific example of the battery unit shown in FIG.

【図3】図2に示された過放電防止装置における電源シ
ョート防止回路の他の実施例の要部を示す回路図であ
る。
FIG. 3 is a circuit diagram showing a main part of another embodiment of a power supply short-circuit prevention circuit in the over-discharge prevention device shown in FIG.

【図4】図1に示された過放電防止装置を用いた電池パ
ックの回路を示している。
4 shows a circuit of a battery pack using the overdischarge prevention device shown in FIG.

【図5】従来例による充電可能な電池の過放電防止装置
が適用された電池ユニットを示すブロック構成図であ
る。
FIG. 5 is a block diagram showing a battery unit to which a rechargeable battery over-discharge prevention device according to a conventional example is applied.

【図6】図5に示された過放電防止装置における過放電
検出回路を示す回路図である。
6 is a circuit diagram showing an overdischarge detection circuit in the overdischarge prevention device shown in FIG.

【符号の説明】[Explanation of symbols]

100 リチウムイオン電池(電池) 10、410 過放電検出回路 11、411 コンパレータ 20、420 スイッチ 30 電源ショート防止回路 50p、450p 正側負荷電流ライン 50n、450n 負側負荷電流ライン 200 負荷 ER 基準電圧発生源 R1、R2 ブリーダ抵抗 R3 検出入力側抵抗 RG 基準電圧側抵抗100 Lithium-ion battery (battery) 10,410 Over-discharge detection circuit 11,411 Comparator 20,420 Switch 30 Power supply short circuit prevention circuit 50p, 450p Positive side load current line 50n, 450n Negative side load current line 200 Load E R Reference voltage generation Source R1, R2 Bleeder resistance R3 Detection input side resistance RG Reference voltage side resistance

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 充電可能な電池と負荷との間に接続さ
れ、前記電池の端子電圧が放電を禁止すべき電圧値にま
で低下したことを検出する電圧比較部を含む過放電検出
回路と、前記過放電検出回路の検出により前記電池から
前記負荷への給電を停止させるスイッチ回路とを有する
充電可能な電池の過放電防止装置において、放電制御端
子に所定の電位を与えたときのみ放電を可能とする電源
ショート防止回路を付加したことを特徴とする充電可能
な電池の過放電防止装置。
1. An over-discharge detection circuit connected between a rechargeable battery and a load, the over-discharge detection circuit including a voltage comparison unit for detecting that the terminal voltage of the battery has dropped to a voltage value at which discharge should be prohibited. In a rechargeable battery over-discharge prevention device having a switch circuit for stopping power supply from the battery to the load by detection of the over-discharge detection circuit, discharging is possible only when a predetermined potential is applied to a discharge control terminal. An overdischarge prevention device for a rechargeable battery, characterized in that a power supply short circuit prevention circuit is added.
【請求項2】 請求項1記載の充電可能な電池の過放電
防止装置において、前記スイッチ回路は、負荷電流ライ
ンにソース、ドレインを接続した半導体スイッチにより
構成され、前記電源ショート防止回路は、前記過放電検
出回路と前記スイッチ回路とに接続されていることを特
徴とする充電可能な電池の過放電防止装置。
2. The overcharge prevention device for a rechargeable battery according to claim 1, wherein the switch circuit is composed of a semiconductor switch in which a source and a drain are connected to a load current line, and the power supply short-circuit prevention circuit includes: An overdischarge prevention device for a rechargeable battery, which is connected to an overdischarge detection circuit and the switch circuit.
【請求項3】 請求項1記載の充電可能な電池の過放電
防止装置を用いた電池パックにおいて、本体とパックと
を有し、2つの抵抗によって前記電池の端子間電圧を分
割し前記放電制御端子に入力された電圧が設定値の範囲
内にある場合のみ放電可能とし、前記パックに前記抵抗
の一方を内蔵し、前記抵抗の他方を前記本体側に付加し
たことを特徴とする電池パック。
3. A battery pack using the overcharge prevention device for a rechargeable battery according to claim 1, comprising a main body and a pack, and dividing the voltage between terminals of the battery by two resistors to control the discharge. A battery pack characterized in that discharging is possible only when a voltage input to a terminal is within a set value range, one of the resistors is built in the pack, and the other of the resistors is added to the main body side.
JP7165725A 1995-06-30 1995-06-30 Overdischarge preventive device for rechargeable battery and battery pack using the device Pending JPH0919071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7165725A JPH0919071A (en) 1995-06-30 1995-06-30 Overdischarge preventive device for rechargeable battery and battery pack using the device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7165725A JPH0919071A (en) 1995-06-30 1995-06-30 Overdischarge preventive device for rechargeable battery and battery pack using the device

Publications (1)

Publication Number Publication Date
JPH0919071A true JPH0919071A (en) 1997-01-17

Family

ID=15817895

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7165725A Pending JPH0919071A (en) 1995-06-30 1995-06-30 Overdischarge preventive device for rechargeable battery and battery pack using the device

Country Status (1)

Country Link
JP (1) JPH0919071A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09308114A (en) * 1996-05-14 1997-11-28 Sanyo Electric Co Ltd Charge and discharge controller for battery
JP2010110210A (en) * 1998-05-21 2010-05-13 Qualcomm Inc Protecting circuit of battery pack
JP2011254667A (en) * 2010-06-03 2011-12-15 Seiko Instruments Inc Battery state monitoring circuit and battery unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09308114A (en) * 1996-05-14 1997-11-28 Sanyo Electric Co Ltd Charge and discharge controller for battery
JP2010110210A (en) * 1998-05-21 2010-05-13 Qualcomm Inc Protecting circuit of battery pack
JP2011254667A (en) * 2010-06-03 2011-12-15 Seiko Instruments Inc Battery state monitoring circuit and battery unit

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