JP3634128B2 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
JP3634128B2
JP3634128B2 JP29838197A JP29838197A JP3634128B2 JP 3634128 B2 JP3634128 B2 JP 3634128B2 JP 29838197 A JP29838197 A JP 29838197A JP 29838197 A JP29838197 A JP 29838197A JP 3634128 B2 JP3634128 B2 JP 3634128B2
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Japan
Prior art keywords
secondary battery
fet
battery pack
semiconductor switch
battery
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JP29838197A
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JPH11135090A (en
Inventor
哲朗 長久
宏二 竹本
勝 川邉
孝弘 西倉
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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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

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  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明はリチウムイオン二次電池等の二次電池をケース内に収容すると共に、過充電や異常昇温等を防ぐ保護回路が内装された電池パックに関し、携帯電話等の電源として用いられるものに関する。
【０００２】
【従来の技術】
従来のこの種電池パックの構成を、図４〜図６を参照して説明する。
【０００３】
図４〜図６において、１はケース、２はリチウムイオン二次電池、３ａは二次電池２のプラス極２ａに接続するリード線、３ｂは二次電池２のマイナス極２ｂに接続するリード線、４は前記リード線３ａ、３ｂを介して二次電池２に接続される基板上回路を備えた保護回路基板、５は充放電電流を制御するＦＥＴ（半導体スイッチ）、６は電池電圧を検出し電流制御を行うメインＩＣ、７は電池パック内温度を抵抗値変化で測定しその検出値を外部に出力するサーミスタ、８は異常昇温時に急激に抵抗が増大して充放電電流を制限するＰＴＣ（熱保護素子）、９ａ、９ｂ、９ｃは前記基板上回路に接続すると共に外部の回路に接続するために設けた接続端子で、順にプラス接続端子、マイナス接続端子、サーミスタ用接続端子である。１０はＦＥＴ５が異常昇温したときその熱を受けて動作し、充放電電流を遮断する温度ヒューズである。そして図５に示すように、温度ヒューズ１０は伝熱シリコン１１によってＦＥＴ５に熱的に結合され、前記異常昇温に迅速に対処しうるように構成されている。
【０００４】
前記保護回路基板４には、ＦＥＴ５、メインＩＣ６、サーミスタ７、温度ヒューズ１０が搭載されると共に抵抗素子等の素子が搭載され、基板上回路を構成している。ＰＣＴ８はリード線３ｂの途中に配され、二次電池２に直列に接続されている。
【０００５】
上記構成を有することにより、電池パックの二次電池２は次のように保護されている。
【０００６】
先ず、二次電池２の電圧が４．２Ｖ以上又は３．０Ｖ以下になったとき、メインＩＣ６がＦＥＴ５をオフ動作させ、過充放電を防止する。
【０００７】
次に、電池パック内温度が異常に上昇したとき、サーミスタ７からの検出信号により、充電器からの充電電流の供給が停止される。
【０００８】
次に充電器やサーミスタ７がたとえ故障しても、二次電池２等の異常昇温によりＰＴＣ８の抵抗値が急激に増大して、充放電電流を制限する。
【０００９】
更に、ＦＥＴ５が故障してドレイン−ソース間の抵抗値が増大すると、ＦＥＴ５がジュール熱のため発熱し異常昇温するが、この異常昇温により温度ヒューズ１０が動作して、充放電電流を遮断する。
【００１０】
【発明が解決しようとする課題】
上記従来例は、ＦＥＴ５の故障による発熱に対し安全を図るために、保護回路基板４上に温度ヒューズ１０を搭載している。この温度ヒューズ１０は両リード部を保護回路基板４に挿通し、ハンダ付けを行った後ＦＥＴ５に伝熱シリコン１１でもって固定している。温度ヒューズ１０は熱に反応して開路するためハンダリフローを通せない。従って保護回路基板４への他部品との一括固定ができず、後付けが必要であり、しかもその後付け作業が上記のように煩雑である。このため、生産性が悪くコストアップを招く。又温度ヒューズ１０は、ハンダ付け時の熱的影響を避けるため、両リード部の長さを大きくとらなければならないため、保護回路基板４の大型化を招き、この結果電池パックの小型化が困難となる。
【００１１】
【課題を解決するための手段】
本発明は上記従来例の問題点を解消するため、二次電池をケースに内装すると共に、二次電池の電圧に応じて二次電池の充放電電流を制御する半導体スイッチと、周囲温度が所定値以上となったとき抵抗が急激に増大して二次電池への充電電流を抑制する熱保護素子とを備えた電池パックにおいて、半導体スイッチが搭載される保護回路基板の半導体スイッチ背面部に貫通穴を設け、この貫通穴に熱保護素子が収容される状態で、熱保護素子と半導体スイッチとを熱的に結合したことを特徴とする。
【００１２】
本発明によれば、半導体スイッチ（ＦＥＴ）が故障して異常昇温したとき、その熱は迅速に熱保護素子（ＰＣＴ）に伝わり、熱保護素子の抵抗値が急激に増大して、二次電池への充電電流を制限し、電池パックの安全性を図ることができる。従って従来例で必要であった温度ヒューズを省略することができる。
【００１３】
また、半導体スイッチが搭載される保護回路基板の半導体スイッチ背面部に貫通穴を設け、この貫通穴に熱保護素子が収容される状態で、熱保護素子と半導体スイッチとを熱的に結合した構成としているので、保護回路基板の貫通穴に熱保護素子が収容される分、保護回路基板を二次電池に接近させて配することができる結果、電池パックの背高を低くでき、電池パックのコンパクト化を図ることができる。
【００１４】
【発明の実施の形態】
本発明をリチウムイオン二次電池２を内装した電池パックに適用した第１実施形態を、図１、図２を参照して説明する。
【００１５】
図１において、１はケース、２はリチウムイオン二次電池、３ａは二次電池２のプラス極２ａに接続するリード線、３ｂは二次電池２のマイナス極２ｂに接続するリード線、４は前記リード線３ａ、３ｂを介して二次電池２に接続される基板上回路を備えた保護回路基板、５は充放電電流を制御するＦＥＴ（半導体スイッチ）、６は電池電圧を検出し電流制御を行うメインＩＣ、７は電池パック内温度を抵抗値変化で測定しその検出値を外部に出力するサーミスタ、８は異常昇温時に急激に抵抗が増大して充放電電流を制限するＰＴＣ（熱保護素子）、９ａ、９ｂ、９ｃは前記基板上回路に接続すると共に外部の回路に接続するために設けた接続端子で、順にプラス接続端子、マイナス接続端子、サーミスタ用接続端子である。
【００１６】
前記保護回路基板４には、ＦＥＴ５、メインＩＣ６、サーミスタ７が搭載されると共に抵抗素子等の素子が搭載され、基板上回路を構成している。ＰＴＣ８はリード線３ｂの途中に配され、二次電池２に直列に接続されている。
【００１７】
リチウムイオン二次電池２は、安全に充放電できる電圧が３．０Ｖ〜４．２Ｖの範囲にある。そして、特に充電時に電圧が４．２Ｖを越えると電池内部で化学反応が過剰に起こり、急激に電池温度が上昇する。
【００１８】
メインＩＣ６は、二次電池２の電圧を検出し、この検出電圧に基づきＦＥＴ５を動作させる。ＦＥＴ５をオフ動作させる電圧は４．２Ｖ以上又は３．０Ｖ以下である。
【００１９】
ＦＥＴ５は、図２に示すように、充電制御用ＦＥＴ５ａと放電制御用ＦＥＴ５ｂとを備え、二次電池２の電圧が４．２Ｖ以上のとき、すなわち過充電時には充電制御用ＦＥＴ５ａが、二次電池２の電圧が３．０Ｖ以下のとき、すなわち過放電時には放電制御用ＦＥＴ５ｂがそれぞれオフ動作し、ドレイン−ソース間を遮断し、充放電電流を遮断する。
【００２０】
サーミスタ７は、電池パック内温度を抵抗値変化で測定し、その検出値を外部の充電器（図示省略）に出力する。電池パック内温度が異常に高い場合には充電器は充電電流の供給を停止する。
【００２１】
ＰＴＣ８は、周囲温度が異常昇温し所定値以上となったとき、急激に抵抗が増大して充放電電流を制限するものであり、図１に示すように、二次電池２に一面が、ＦＥＴ５に他面が接触するように配置されている。従ってＰＴＣ８は、二次電池２及びＦＥＴ５に熱的結合されているため、二次電池２が異常昇温したときのみならず、ＦＥＴ５が異常昇温したときにも、充放電電流を制限する。
【００２２】
図２は電池保護回路を示している。電池パックは、充電器に接続され、充電電流はプラス接続端子９ａ、二次電池２、ＰＴＣ８、ＦＥＴ５、マイナス接続端子９ｂを流れて二次電池２を充電する。放電時には、電池パックは使用機器に接続され、充電電流と逆の方向に放電電流が流れる。
【００２３】
上記構成を有することにより、電池パックは次のように保護されている。
【００２４】
先ず、二次電池２の電圧が４．２Ｖ以上又は３．０Ｖ以下になったとき、メインＩＣ６がＦＥＴ５をオフ動作させ、過充放電を防止する。
【００２５】
次に、ＦＥＴ５が故障して異常昇温したとき、その異常昇温によりＰＴＣ８の抵抗値が急激に増大して、充放電電流を制限する。
【００２６】
次に、電池パック内温度が異常に上昇したとき、サーミスタ７からの検出信号により、充電器から充電電流の供給が停止される。
【００２７】
更に充電器やサーミスタ７がたとえ故障しても、二次電池２の異常昇温によりＰＴＣ８の抵抗値が急激に増大して、充放電電流を制限する。
【００２８】
図３は本発明の第２実施形態を示している。この第２実施形態は第１実施形態と基本構成を共通にするが、図３に示すように、保護回路基板４の上面にＦＥＴ５、メインＩＣ６、サーミスタ７等のチップを搭載すると共に、ＦＥＴ５の下面（背面部）において保護回路基板４に貫通穴１２を設け、この貫通穴１２に二次電池２の上面に接するように配したＰＴＣ８の上部を収容し、かつＦＥＴ５とＰＴＣ８とを熱的に結合するように接触させた点で第１実施形態と相違している。
【００２９】
上記構成によると、図１に示す場合に比較し、図３に示すように保護回路基板４と二次電池２の上面との間隔Ｈを小とでき、電池パックのコンパクト化を図ることができる。
【００３０】
【発明の効果】
本発明によれば、従来必要であった温度ヒューズを省略することができるにもかかわらず、半導体スイッチの故障、発熱に対する安全性を確保でき、その結果電池パックの生産性を向上できると共にコンパクト化を図ることができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示す概略正面図。
【図２】その電池保護回路を示す回路図。
【図３】本発明の第２実施形態を示す概略正面図。
【図４】従来例を示す概略正面図。
【図５】その温度ヒューズとＦＥＴとの関係を示す概略平面図。
【図６】その電池保護回路を示す回路図。
【符号の説明】
１ ケース
２ 二次電池
４ 保護回路基板
５ 半導体スイッチ（ＦＥＴ）
８ 熱保護素子（ＰＴＣ）
１２ 貫通穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack in which a secondary battery such as a lithium ion secondary battery is accommodated in a case and is provided with a protection circuit for preventing overcharging, abnormal temperature rise, etc., and to a battery pack used as a power source for a mobile phone or the like. .
[0002]
[Prior art]
The configuration of this conventional battery pack will be described with reference to FIGS.
[0003]
4 to 6, 1 is a case, 2 is a lithium ion secondary battery, 3 a is a lead wire connected to the positive electrode 2 a of the secondary battery 2, and 3 b is a lead wire connected to the negative electrode 2 b of the secondary battery 2. 4 is a protection circuit board having a circuit on the substrate connected to the secondary battery 2 via the lead wires 3a and 3b, 5 is an FET (semiconductor switch) for controlling charge / discharge current, and 6 is a battery voltage detector. The main IC 7 for controlling the current, thermistor 7 for measuring the temperature inside the battery pack by changing the resistance value and outputting the detected value to the outside, and 8 for limiting the charging / discharging current due to a sudden increase in resistance when the temperature rises abnormally PTC (thermal protection elements) 9a, 9b, and 9c are connection terminals provided to connect to the circuit on the substrate and to an external circuit, and are a positive connection terminal, a negative connection terminal, and a thermistor connection terminal in order. . Reference numeral 10 denotes a temperature fuse that operates by receiving heat when the FET 5 abnormally increases in temperature and cuts off a charge / discharge current. As shown in FIG. 5, the thermal fuse 10 is thermally coupled to the FET 5 by the heat transfer silicon 11 so that it can quickly cope with the abnormal temperature rise.
[0004]
On the protection circuit board 4, an FET 5, a main IC 6, a thermistor 7, a thermal fuse 10 are mounted and elements such as a resistance element are mounted to constitute a circuit on the board. The PCT 8 is arranged in the middle of the lead wire 3 b and is connected to the secondary battery 2 in series.
[0005]
By having the said structure, the secondary battery 2 of a battery pack is protected as follows.
[0006]
First, when the voltage of the secondary battery 2 becomes 4.2 V or higher or 3.0 V or lower, the main IC 6 turns off the FET 5 to prevent overcharge / discharge.
[0007]
Next, when the temperature inside the battery pack rises abnormally, the supply of the charging current from the charger is stopped by the detection signal from the thermistor 7.
[0008]
Next, even if the charger or thermistor 7 breaks down, the resistance value of the PTC 8 rapidly increases due to abnormal temperature rise of the secondary battery 2 or the like, thereby limiting the charge / discharge current.
[0009]
Further, when the resistance value between the drain and the source increases due to the failure of the FET 5, the FET 5 generates heat due to Joule heat and the temperature rises abnormally. The abnormal temperature rise causes the temperature fuse 10 to operate and cut off the charging / discharging current. To do.
[0010]
[Problems to be solved by the invention]
In the above conventional example, the thermal fuse 10 is mounted on the protection circuit board 4 in order to ensure safety against heat generated by the failure of the FET 5. The thermal fuse 10 is fixed to the FET 5 with heat transfer silicon 11 after both lead portions are inserted into the protection circuit board 4 and soldered. Since the thermal fuse 10 opens in response to heat, it cannot pass solder reflow. Accordingly, the protective circuit board 4 cannot be fixed together with other components, so that retrofitting is necessary, and the subsequent work is complicated as described above. For this reason, the productivity is poor and the cost is increased. In addition, since the thermal fuse 10 must have a large length for both lead portions in order to avoid thermal influence during soldering, the protective circuit board 4 is increased in size, and as a result, it is difficult to reduce the size of the battery pack. It becomes.
[0011]
[Means for Solving the Problems]
In order to solve the problems of the conventional example described above, the present invention includes a secondary battery in a case, a semiconductor switch that controls the charging / discharging current of the secondary battery according to the voltage of the secondary battery, and an ambient temperature that is predetermined. In a battery pack with a thermal protection element that suppresses the charging current to the secondary battery by rapidly increasing the resistance when the value exceeds the value, it penetrates through the back of the semiconductor switch on the protection circuit board on which the semiconductor switch is mounted A hole is provided, and the thermal protection element and the semiconductor switch are thermally coupled in a state where the thermal protection element is accommodated in the through hole .
[0012]
According to the present invention, when the semiconductor switch (FET) fails and the temperature rises abnormally, the heat is quickly transferred to the thermal protection element (PCT), and the resistance value of the thermal protection element increases abruptly. By limiting the charging current to the battery, the safety of the battery pack can be achieved. Therefore, the temperature fuse required in the conventional example can be omitted.
[0013]
In addition , a configuration in which a through hole is provided in the back surface of the semiconductor switch of the protection circuit board on which the semiconductor switch is mounted, and the thermal protection element and the semiconductor switch are thermally coupled in a state in which the thermal protection element is accommodated in the through hole. Since the thermal protection element is accommodated in the through hole of the protection circuit board, the protection circuit board can be arranged close to the secondary battery, so that the height of the battery pack can be lowered, and the battery The pack can be made compact.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment in which the present invention is applied to a battery pack in which a lithium ion secondary battery 2 is housed will be described with reference to FIGS. 1 and 2.
[0015]
In FIG. 1, 1 is a case, 2 is a lithium ion secondary battery, 3a is a lead wire connected to the positive electrode 2a of the secondary battery 2, 3b is a lead wire connected to the negative electrode 2b of the secondary battery 2, and 4 is A protection circuit board having an on-board circuit connected to the secondary battery 2 through the lead wires 3a and 3b, 5 is an FET (semiconductor switch) for controlling the charge / discharge current, and 6 is a current control by detecting the battery voltage. The main IC 7 performs thermistor that measures the temperature inside the battery pack by changing the resistance value and outputs the detected value to the outside. The PTC (heat PTC) that restricts the charge / discharge current due to a sudden increase in resistance when the temperature rises abnormally Protective elements 9a, 9b, and 9c are connection terminals provided to connect to the circuit on the substrate and to an external circuit, and are a positive connection terminal, a negative connection terminal, and a thermistor connection terminal in this order.
[0016]
On the protection circuit board 4, an FET 5, a main IC 6, and a thermistor 7 are mounted and elements such as a resistance element are mounted to constitute a circuit on the board. The PTC 8 is arranged in the middle of the lead wire 3 b and is connected to the secondary battery 2 in series.
[0017]
The lithium ion secondary battery 2 has a voltage that can be charged and discharged safely in a range of 3.0V to 4.2V. In particular, when the voltage exceeds 4.2 V during charging, an excessive chemical reaction occurs inside the battery, and the battery temperature rapidly increases.
[0018]
The main IC 6 detects the voltage of the secondary battery 2 and operates the FET 5 based on this detected voltage. The voltage for turning off the FET 5 is 4.2 V or more or 3.0 V or less.
[0019]
As shown in FIG. 2, the FET 5 includes a charge control FET 5a and a discharge control FET 5b. When the voltage of the secondary battery 2 is 4.2 V or more, that is, during overcharge, the charge control FET 5a is replaced with the secondary battery. When the voltage of 2 is 3.0 V or less, that is, during overdischarge, the discharge control FET 5b is turned off to cut off the drain-source and cut off the charge / discharge current.
[0020]
The thermistor 7 measures the temperature inside the battery pack by changing the resistance value, and outputs the detected value to an external charger (not shown). When the temperature inside the battery pack is abnormally high, the charger stops supplying the charging current.
[0021]
When the ambient temperature is abnormally raised and exceeds a predetermined value, the PTC 8 rapidly increases the resistance and limits the charging / discharging current. As shown in FIG. It arrange | positions so that the other surface may contact FET5. Accordingly, since the PTC 8 is thermally coupled to the secondary battery 2 and the FET 5, the charge / discharge current is limited not only when the secondary battery 2 is abnormally heated but also when the FET 5 is abnormally heated.
[0022]
FIG. 2 shows a battery protection circuit. The battery pack is connected to a charger, and the charging current flows through the positive connection terminal 9a, the secondary battery 2, the PTC 8, the FET 5, and the negative connection terminal 9b to charge the secondary battery 2. At the time of discharging, the battery pack is connected to the device used, and a discharging current flows in the direction opposite to the charging current.
[0023]
By having the said structure, the battery pack is protected as follows.
[0024]
First, when the voltage of the secondary battery 2 becomes 4.2 V or higher or 3.0 V or lower, the main IC 6 turns off the FET 5 to prevent overcharge / discharge.
[0025]
Next, when the FET 5 fails and the temperature rises abnormally, the resistance value of the PTC 8 suddenly increases due to the abnormal temperature rise, thereby limiting the charge / discharge current.
[0026]
Next, when the temperature inside the battery pack rises abnormally, the supply of charging current from the charger is stopped by the detection signal from the thermistor 7.
[0027]
Further, even if the charger or thermistor 7 breaks down, the resistance value of the PTC 8 rapidly increases due to the abnormal temperature rise of the secondary battery 2 to limit the charge / discharge current.
[0028]
FIG. 3 shows a second embodiment of the present invention. Although the second embodiment shares the same basic configuration as the first embodiment, as shown in FIG. 3, a chip such as FET 5, main IC 6, thermistor 7, etc. is mounted on the upper surface of the protection circuit substrate 4. A through hole 12 is provided in the protective circuit board 4 on the lower surface (back surface portion), and the upper portion of the PTC 8 disposed so as to contact the upper surface of the secondary battery 2 is accommodated in the through hole 12 and the FET 5 and the PTC 8 are thermally connected. It is different from the first embodiment in that it is brought into contact so as to be coupled.
[0029]
According to the above configuration, the distance H between the protection circuit board 4 and the upper surface of the secondary battery 2 can be made smaller as shown in FIG. 3 than in the case shown in FIG. 1, and the battery pack can be made compact. .
[0030]
【The invention's effect】
According to the present invention, it is possible to ensure the safety against failure and heat generation of a semiconductor switch, and to improve the productivity of the battery pack, and to make the battery pack compact, although the temperature fuse that has been necessary in the past can be omitted. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing the battery protection circuit.
FIG. 3 is a schematic front view showing a second embodiment of the present invention.
FIG. 4 is a schematic front view showing a conventional example.
FIG. 5 is a schematic plan view showing the relationship between the thermal fuse and the FET.
FIG. 6 is a circuit diagram showing the battery protection circuit.
[Explanation of symbols]
1 Case 2 Secondary Battery 4 Protection Circuit Board 5 Semiconductor Switch (FET)
8 Thermal protection element (PTC)
12 Through hole

Claims (2)

二次電池をケースに内装すると共に、二次電池の電圧に応じて二次電池の充放電電流を制御する半導体スイッチと、周囲温度が所定値以上となったとき抵抗が急激に増大して二次電池への充電電流を抑制する熱保護素子とを備えた電池パックにおいて、半導体スイッチが搭載される保護回路基板の半導体スイッチ背面部に貫通穴を設け、この貫通穴に熱保護素子が収容される状態で、熱保護素子と半導体スイッチとを熱的に結合したことを特徴とする電池パック。A secondary battery is housed in the case, and a semiconductor switch that controls the charging / discharging current of the secondary battery according to the voltage of the secondary battery, and the resistance rapidly increases when the ambient temperature exceeds a predetermined value. In a battery pack comprising a thermal protection element that suppresses the charging current to the secondary battery, a through hole is provided in the back surface of the semiconductor switch of the protection circuit board on which the semiconductor switch is mounted, and the thermal protection element is accommodated in the through hole. A battery pack , wherein the thermal protection element and the semiconductor switch are thermally coupled in a state where 半導体スイッチがＦＥＴであり、熱保護素子がＰＴＣである請求項１記載の電池パック。The semiconductor switch is a FET, a battery pack according to claim 1, wherein the thermal protection device is a PTC.
JP29838197A 1997-10-30 1997-10-30 Battery pack Expired - Fee Related JP3634128B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29838197A JP3634128B2 (en) 1997-10-30 1997-10-30 Battery pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29838197A JP3634128B2 (en) 1997-10-30 1997-10-30 Battery pack

Publications (2)

Publication Number Publication Date
JPH11135090A JPH11135090A (en) 1999-05-21
JP3634128B2 true JP3634128B2 (en) 2005-03-30

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Publication number Priority date Publication date Assignee Title
DE20005816U1 (en) * 2000-03-29 2000-07-13 VARTA Gerätebatterie GmbH, 30419 Hannover Electric accumulator with electronic safety protection circuit
JP4904614B2 (en) * 2000-06-22 2012-03-28 パナソニック株式会社 Battery pack and manufacturing method thereof
JP3716773B2 (en) * 2001-09-27 2005-11-16 ソニー株式会社 Battery pack and thermostat used therefor
JP5220251B2 (en) * 2001-09-28 2013-06-26 Ｎｅｃエナジーデバイス株式会社 Battery pack with warning function
JP2003151640A (en) * 2001-11-09 2003-05-23 Matsushita Electric Ind Co Ltd Secondary battery protecting element and installation method thereof
KR100559705B1 (en) 2004-07-28 2006-03-10 주식회사 팬택앤큐리텔 Battery Pack Protective Device with Battery Pack
KR101042768B1 (en) 2008-06-03 2011-06-20 삼성에스디아이 주식회사 Battery pack and method of charge thereof
JP7063661B2 (en) * 2018-03-14 2022-05-09 マクセル株式会社 Laminated battery

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