JP4329326B2 - Secondary battery and secondary battery pack with temperature protection element unit - Google Patents
Secondary battery and secondary battery pack with temperature protection element unit Download PDFInfo
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- JP4329326B2 JP4329326B2 JP2002315714A JP2002315714A JP4329326B2 JP 4329326 B2 JP4329326 B2 JP 4329326B2 JP 2002315714 A JP2002315714 A JP 2002315714A JP 2002315714 A JP2002315714 A JP 2002315714A JP 4329326 B2 JP4329326 B2 JP 4329326B2
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- 238000007599 discharging Methods 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000020169 heat generation Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000009783 overcharge test Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011255 nonaqueous electrolyte Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002946 graphitized mesocarbon microbead Substances 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
Images
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
Description
【０００１】
【発明の属する技術分野】
本発明は、正極、負極、セパレータ及び電解液からなる二次電池または複数個の二次電池からなる電池パックに関し、特に好適な温度保護素子ユニットにより過充電時の電池を保護する二次電池または電池パックに関する。
【０００２】
【従来の技術】
近年、ＡＶ機器やパソコン等、電子機器のコードレス化やポータブル化に伴って、非水電解質を備える高エネルギー密度のリチウムイオン二次電池やアルカリ電解質を備えるアルカリ蓄電池などの小型二次電池が多く採用されている。これら機器の高性能化、高機能化が進むのに伴い、より高容量で高出力が可能な電池が望まれている。
【０００３】
特にノートパソコンの場合、ＣＰＵの高速化により電池が使用される環境は、益々高温雰囲気へとシフトしている。リチウムイオン二次電池やリチウムポリマー電池などの非水系二次電池の場合、電解液に有機溶媒を使用していることもあり、充電器の故障などにより過充電状態になって電池の温度が上昇するのを温度ヒューズ、ＰＴＣなどの温度保護素子を使用して、ある一定温度以下に制限させている（例えば、特許文献１または２参照）。
【０００４】
【特許文献１】
特開２００２−１９８０３２号公報
【特許文献２】
特開平５−７４４９３号公報
【０００５】
【発明が解決しようとする課題】
小型二次電池においては、より高温でのハイレート放電、つまり通常の放電時には電池が高温になっても温度保護素子が作動しないことが望まれている。一方、過充電時にはできるだけ低い温度で温度保護素子を作動させて、電池が高温にならないことが求められている。しかしながら従来の方式では、過充電時以外でも放電時の電池自身の発熱に加え、温度保護素子にも電流が流れることによる自己発熱も加わるため、温度保護素子が作動することがある。このとき、例えば放電時に作動しにくいような温度保護素子を選択した場合、過充電時に温度保護素子が作動する温度が高くなるという相反した効果が生じ、電池設計上これらのバランスをとるのが難しかった。
【０００６】
本発明はこのような課題を解決し、温度保護素子ユニット付き二次電池または電池パックにおいて、放電時には温度保護素子自身の自己発熱による温度上昇がなく、従来と比較してより高温でのハイレート放電を可能にすることを目的とするものである。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、本発明の温度保護素子ユニット付き二次電池または二次電池パックは、正極、負極、セパレータ及び電解液からなる二次電池と温度保護素子を備えた温度保護素子ユニットからなり、外部端子は、正負極の２つのみである温度保護素子ユニット付き二次電池または二次電池パックにおいて、前記温度保護素子ユニットは、前記二次電池と前記外部端子の一方との間に配置され、前記温度保護素子ユニットは、温度保護素子並びに前記温度保護素子と直列に接続された第１のダイオード及び前記温度保護素子と並列でかつ第１のダイオードとは逆方向に接続された第２のダイオードからなり、充電時には前記温度保護素子と第１のダイオードの経路を、放電時には第２のダイオードの経路を通じてのみ電流が流れる構造であることを特徴としたものであり、高温でのハイレート放電が可能であるという作用を有し、複雑なスイッチ等を使わずに簡易な構成になるので好ましい。
【０００９】
ここで、温度保護素子には、従来公知のものが使えるが、温度ヒューズ、ブレーカーおよびＰＴＣ素子が、価格性能等で優れており好ましい。
【００１０】
さらに、本発明の二次電池を複数個接続して二次電池パックにしても構わない。
【００１１】
【発明の実施の形態】
以下、図を用いて本発明の好ましい実施の形態を説明する。
【００１２】
図１は本発明の温度保護素子ユニット付き二次電池の回路図、図２は従来の温度保護素子ユニット付き二次電池の回路図、図３は本発明の温度保護素子ユニット付き二次電池の斜視図である。図４は本発明の温度保護素子ユニット付き二次電池パックの回路図である。
【００１３】
図１から４を用いて本発明の基本構成を説明する。
【００１４】
図１の温度保護素子ユニット１ａは、電池４の負極端子側に直列に接続された温度保護素子２とダイオード３ａ及びこれらに並列に接続されたダイオード３ｂからなる。充電時は矢印Ｃで示すようにダイオード３ａと温度保護素子２を経由して電流が流れるため、電池４の発熱と温度保護素子２自身の発熱によって温度保護素子２の温度が規格値以上になった場合、温度保護素子２は作動して電流を遮断する。いずれの発熱も流れる電流値に比例するため、電流値が高い場合、動作温度に早く到達する。放電時はダイオードの特性からダイオード３ｂを経由して矢印Ｄで示すように電流が流れるため、高温雰囲気下のハイレート放電時においても温度保護素子２は温度保護素子２に流れる電流による自己発熱の影響はない。
【００１５】
一方、図２の従来の温度保護素子ユニット１ｂでは、充電時、放電時とも温度保護素子２に電流が流れるため、放電時に温度保護素子２自身の発熱の影響で温度保護素子２が作動しやすくなる。
【００１６】
図３は、図１に示した温度保護素子ユニット１ａを用い、電池４としてアルミニウム缶を外装缶７としたリチウムイオン二次電池を用いたものである。負極端子５からダイオード１と温度保護素子２を通じて外部端子６が電池４上に正極である外装缶７と絶縁されて設置されており、また、ダイオード３ａと逆方向のダイオード３ｂが、ダイオード３ａと温度保護素子２に並列に負極端子５と外部端子６を結んでいる。
【００１７】
図４は複数個の二次電池４からなる電池パック４ａに温度保護素子ユニット１ａを搭載させたものである。電池パック４ａの温度保護素子ユニット１ａに同様な機能を持たせる場合も同じ効果となる。
【００１８】
また、図１に示した温度保護素子ユニット付き二次電池を複数個つないで電池パックにしても良い。
【００１９】
【実施例】
以下に本発明の実施例について角形リチウムイオン二次電池を例にとり説明する。
【００２０】
正極板には、正極活物質としてコバルト酸リチウムを用い、これに導電性付与剤としてアセチレンブラック、結着剤としてポリテトラフルオロエチレン（ＰＴＦＥ）、増粘剤としてＣＭＣを混合し、水を分散媒としてスラリー状の正極用合剤を作製した。集電体にはアルミニウム箔を用い、上記正極用合剤を塗布して正極板用シートを作製、乾燥後、所定の厚さに圧延成形し、正極板を作製した。上記極板には目的に応じてタブ式リードを超音波で溶接した。
【００２１】
負極板には、活物質として黒鉛化メソカーボンマイクロビーズ（ＭＣＭＢ）、結着剤としてスチレン−ブタジエン重合ゴム（ＳＢＲ）、増粘剤としてＣＭＣを混合し、水を分散媒としてスラリー状の負極用合剤を作製した。集電体として銅箔を用い、上記集電体の両面に負極用合剤を塗布して負極板用シートを作製した。つぎに上記負極板用シートを乾燥し、所定の厚さに圧延し、所定の寸法に裁断して負極板を作製した。上記負極板の一部にはニッケル製のタブ式リードを超音波で溶着した。
【００２２】
上記の正極板と負極板を、ポリエチレンの微多孔膜であるセパレータを介して巻回して極板群を作製した。
【００２３】
上記極板群をケースに挿入後、非水電解液を注入した。電解液にはエチレンカーボネートとジエチルカーボネートを体積比１：１の割合で混合した溶媒に六フッ化燐酸リチウム１．０ｍｏｌ／ｌを溶解させた非水電解質溶液を用いた。正極のタブ式リードはケースの内壁に導接した。負極のタブ式リードは封口板の端子部に接続し、封口板を用いて封口し、活性化充放電を数サイクル実施し、角形リチウムイオン二次電池を作製した。
【００２４】
このようにして得られた角形リチウムイオン二次電池に本発明の温度保護素子ユニットを取り付け、過充電試験及び定ワット放電試験を行った。今回の試験には、定格９２℃で作動する市販品の温度ヒューズ（松下電子部品（株） 品番：ＥＹＰ４ＭＵ０９２Ｘ）一つと、ダイオードは定格５Ａ（新電元工業製 ＤＥ５Ｓ４Ｍ）のものを二つ用いた。回路構成は、図１に示したとおりである。
【００２５】
過充電試験は、充電電源を１８Ｖ、１．３Ａ（０．７Ｃ相当）に設定し、連続充電を行った。この電池には温度保護素子ユニット以外の過充電保護素子は装着されていない。
【００２６】
定ワット放電試験は、２５℃で満充電まで充電後、６０℃雰囲気下で１５Ｗ放電を行った。
【００２７】
なお比較のため図２に示した従来の構成の温度保護素子ユニットを取り付けて同様な試験を行った。
【００２８】
図５に過充電試験の結果を示す。ここで、本発明の電池８も従来の電池９とほぼ同じ温度で充電電流１０および充電電圧１１が遮断され、破裂・発火しなかった。
【００２９】
図６に１５Ｗ放電試験を行った結果を示す。従来の電池９では約１５分放電した時点１２で温度ヒューズが作動し、放電できなくなった。一方、本発明の温度保護素子ユニットを取り付けた電池８では、約３３分（放電末期１３まで）放電できた。
【００３０】
以上のように本発明の温度保護素子ユニットを用いることにより、従来と比較して高温でのハイレート放電が可能となった。
【００３１】
なお、本発明の温度保護素子ユニットを用いた場合、外部短絡時に電流を遮断させることはできないが、外部短絡試験で発火・発煙することはなかった。
【００３２】
なお、本実施例では温度保護素子として温度ヒューズを用いたが、ＰＴＣ素子やブレーカーおよびその他公知の温度保護素子を用いても同様な結果となる。
【００３３】
また、本実施例では素電池に温度保護素子ユニットを装着した例を示したが、複数個の二次電池からなる電池パックに温度保護素子ユニットを搭載させた場合も同じである。
【００３４】
【発明の効果】
以上のように本発明は、従来と比較して過充電時の電流遮断温度は同じで、高温でのハイレート放電を可能にし、複雑なスイッチ等を使わずに簡易な構成とすることができる。
【図面の簡単な説明】
【図１】本発明の温度保護素子ユニット付き二次電池の回路図
【図２】従来の温度保護素子ユニット付き二次電池の回路図
【図３】本発明の温度保護素子ユニット付き二次電池の斜視図
【図４】本発明の温度保護素子ユニット付き二次電池パックの回路図
【図５】実施例電池と従来電池との過充電試験の結果を示す図
【図６】実施例電池と従来電池との６０℃１５Ｗ放電試験の結果を示す図
【符号の説明】
１ａ，１ｂ 温度保護素子ユニット
２ 温度保護素子
３ａ，３ｂ ダイオード
４ 電池
４ａ 電池ユニット
５ 負極端子
６ 外部端子
７ 外装缶
８ 本発明の電池
９ 比較の電池
１０ 充電電流
１１ 充電電圧[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution or a battery pack comprising a plurality of secondary batteries, and a secondary battery that protects a battery during overcharge by a particularly suitable temperature protection element unit or It relates to a battery pack.
[0002]
[Prior art]
In recent years, along with the cordless and portable use of electronic devices such as AV equipment and personal computers, many small secondary batteries such as high energy density lithium ion secondary batteries equipped with non-aqueous electrolyte and alkaline storage batteries equipped with alkaline electrolyte have been adopted. Has been. As these devices have higher performance and higher functionality, batteries having higher capacity and higher output are desired.
[0003]
In particular, in the case of a notebook personal computer, the environment in which the battery is used as the CPU speeds up is increasingly shifting to a high temperature atmosphere. In the case of non-aqueous secondary batteries such as lithium ion secondary batteries and lithium polymer batteries, an organic solvent may be used in the electrolyte, and the battery temperature rises due to overcharge due to a failure of the charger. The temperature is limited to a certain temperature or less by using a temperature protection element such as a thermal fuse or PTC (see, for example,
[0004]
[Patent Document 1]
JP 2002-198032 A [Patent Document 2]
Japanese Patent Laid-Open No. 5-74493
[Problems to be solved by the invention]
In a small secondary battery, it is desired that a high-rate discharge at a higher temperature, that is, a temperature protection element does not operate even when the battery becomes hot during normal discharge. On the other hand, it is required that the battery is not heated by operating the temperature protection element at the lowest possible temperature during overcharging. However, in the conventional method, in addition to the heat generation of the battery itself at the time of discharging even when it is not overcharged, self-heating due to current flowing through the temperature protection element is also added, so that the temperature protection element may operate. At this time, for example, if a temperature protection element that is difficult to operate at the time of discharging is selected, the contradictory effect that the temperature at which the temperature protection element operates at the time of overcharging increases, and it is difficult to balance these in terms of battery design. It was.
[0006]
The present invention solves such problems, and in a secondary battery or battery pack with a temperature protection element unit, there is no temperature increase due to self-heating of the temperature protection element itself at the time of discharge, and high-rate discharge at a higher temperature than before. It is intended to make possible.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a secondary battery or a secondary battery pack with a temperature protection element unit of the present invention includes a secondary battery comprising a positive electrode, a negative electrode, a separator and an electrolyte, and a temperature protection element unit including a temperature protection element. In the secondary battery or the secondary battery pack with a temperature protection element unit in which there are only two positive and negative terminals, the temperature protection element unit is provided between the secondary battery and one of the external terminals. And the temperature protection element unit includes a temperature protection element, a first diode connected in series with the temperature protection element, and a first diode connected in parallel with the temperature protection element and in a direction opposite to the first diode. consists of two diodes, the path of the temperature protection device and the first diode during charging, during discharging structure in which a current flows only through the path of the second diode Is obtained by wherein a is, has the effect that it is possible to high-rate discharge at a high temperature, since a simple configuration without using complicated switches or the like.
[0009]
Here, a conventionally known element can be used as the temperature protection element, but a temperature fuse, a breaker, and a PTC element are preferable in terms of price performance and the like.
[0010]
Furthermore, a plurality of secondary batteries of the present invention may be connected to form a secondary battery pack.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0012]
1 is a circuit diagram of a secondary battery with a temperature protection element unit of the present invention, FIG. 2 is a circuit diagram of a conventional secondary battery with a temperature protection element unit, and FIG. 3 is a circuit diagram of a secondary battery with a temperature protection element unit of the present invention. It is a perspective view. FIG. 4 is a circuit diagram of a secondary battery pack with a temperature protection element unit of the present invention.
[0013]
The basic configuration of the present invention will be described with reference to FIGS.
[0014]
The temperature protection element unit 1a of FIG. 1 includes a
[0015]
On the other hand, in the conventional temperature protection element unit 1b of FIG. 2, since current flows through the
[0016]
FIG. 3 shows a lithium ion secondary battery using the temperature protection element unit 1a shown in FIG. An
[0017]
FIG. 4 shows a structure in which a temperature protection element unit 1a is mounted on a battery pack 4a composed of a plurality of
[0018]
Also, a plurality of secondary batteries with temperature protection element units shown in FIG. 1 may be connected to form a battery pack.
[0019]
【Example】
Examples of the present invention will be described below by taking a prismatic lithium ion secondary battery as an example.
[0020]
In the positive electrode plate, lithium cobaltate is used as a positive electrode active material, acetylene black as a conductivity-imparting agent, polytetrafluoroethylene (PTFE) as a binder, CMC as a thickener, and water as a dispersion medium. A slurry-like positive electrode mixture was prepared. An aluminum foil was used as the current collector, and the positive electrode mixture was applied to produce a positive electrode plate sheet. After drying, the sheet was rolled to a predetermined thickness to produce a positive electrode plate. A tab type lead was ultrasonically welded to the electrode plate according to the purpose.
[0021]
The negative electrode plate is mixed with graphitized mesocarbon microbeads (MCMB) as an active material, styrene-butadiene polymer rubber (SBR) as a binder, CMC as a thickener, and used as a slurry negative electrode with water as a dispersion medium. A mixture was prepared. A copper foil was used as a current collector, and a negative electrode mixture was applied to both surfaces of the current collector to prepare a negative electrode sheet. Next, the negative electrode plate sheet was dried, rolled to a predetermined thickness, and cut into predetermined dimensions to produce a negative electrode plate. A tab-type lead made of nickel was welded to a part of the negative electrode plate with ultrasonic waves.
[0022]
The positive electrode plate and the negative electrode plate were wound through a separator that is a microporous film of polyethylene to prepare an electrode plate group.
[0023]
After inserting the electrode plate group into the case, a non-aqueous electrolyte was injected. As the electrolytic solution, a non-aqueous electrolyte solution in which 1.0 mol / l of lithium hexafluorophosphate was dissolved in a solvent in which ethylene carbonate and diethyl carbonate were mixed at a volume ratio of 1: 1 was used. The positive tab type lead was in contact with the inner wall of the case. The tab lead of the negative electrode was connected to the terminal portion of the sealing plate, sealed using the sealing plate, activated and discharged several cycles, and a prismatic lithium ion secondary battery was produced.
[0024]
The prismatic lithium ion secondary battery thus obtained was attached with the temperature protection element unit of the present invention, and an overcharge test and a constant watt discharge test were performed. In this test, one commercially available thermal fuse (Matsushita Electronic Parts Co., Ltd. product number: EYP4MU092X) operating at a rating of 92 ° C and two diodes rated at 5A (Shindengen DE5S4M) were used. . The circuit configuration is as shown in FIG.
[0025]
In the overcharge test, the charging power source was set to 18 V, 1.3 A (equivalent to 0.7 C), and continuous charging was performed. This battery is not equipped with an overcharge protection element other than the temperature protection element unit.
[0026]
In the constant watt discharge test, 15 W discharge was performed in a 60 ° C. atmosphere after charging to 25 ° C. until full charge.
[0027]
For comparison, a similar test was performed with the temperature protection element unit having the conventional configuration shown in FIG.
[0028]
FIG. 5 shows the result of the overcharge test. Here, in the
[0029]
FIG. 6 shows the results of a 15 W discharge test. In the
[0030]
As described above, by using the temperature protection element unit of the present invention, high-rate discharge at a higher temperature than before can be performed.
[0031]
When the temperature protection element unit of the present invention was used, the current could not be interrupted at the time of an external short circuit, but it did not ignite or smoke in the external short circuit test.
[0032]
In this embodiment, a thermal fuse is used as the temperature protection element. However, the same result can be obtained by using a PTC element, a breaker, and other known temperature protection elements.
[0033]
Further, in this embodiment, an example in which the temperature protection element unit is mounted on the unit cell is shown, but the same applies to the case where the temperature protection element unit is mounted on a battery pack including a plurality of secondary batteries.
[0034]
【The invention's effect】
The present invention as described above, as compared to traditional current shutdown temperature during overcharge is the same, that enables high-rate discharge at a high temperature, and simple without using complex switches like configuration it can.
[Brief description of the drawings]
1 is a circuit diagram of a secondary battery with a temperature protection element unit of the present invention. FIG. 2 is a circuit diagram of a conventional secondary battery with a temperature protection element unit. FIG. 3 is a secondary battery with a temperature protection element unit of the present invention. FIG. 4 is a circuit diagram of a secondary battery pack with a temperature protection element unit according to the present invention. FIG. 5 is a diagram showing the result of an overcharge test between an example battery and a conventional battery. Figure showing the results of a 60 ° C 15W discharge test with a conventional battery.
DESCRIPTION OF SYMBOLS 1a, 1b Temperature
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002315714A JP4329326B2 (en) | 2002-10-30 | 2002-10-30 | Secondary battery and secondary battery pack with temperature protection element unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002315714A JP4329326B2 (en) | 2002-10-30 | 2002-10-30 | Secondary battery and secondary battery pack with temperature protection element unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004152580A JP2004152580A (en) | 2004-05-27 |
| JP4329326B2 true JP4329326B2 (en) | 2009-09-09 |
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| JP2002315714A Expired - Fee Related JP4329326B2 (en) | 2002-10-30 | 2002-10-30 | Secondary battery and secondary battery pack with temperature protection element unit |
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| JP (1) | JP4329326B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130086108A (en) * | 2012-01-23 | 2013-07-31 | 미쓰미덴기가부시기가이샤 | Battery protection circuit and battery protection apparatus and battery pack |
| KR20170036321A (en) * | 2015-09-24 | 2017-04-03 | 주식회사 엘지화학 | Safety Unit Comprising Bypass Configured to Allow Electric Current to Flow Only When Discharging Battery Cell |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009005559A (en) | 2007-06-25 | 2009-01-08 | Mitsumi Electric Co Ltd | Battery pack |
| JP5061884B2 (en) * | 2007-12-21 | 2012-10-31 | ミツミ電機株式会社 | Battery pack |
| JP5061935B2 (en) * | 2008-02-12 | 2012-10-31 | ミツミ電機株式会社 | Battery pack |
| JP4999004B2 (en) * | 2008-02-29 | 2012-08-15 | 日立マクセルエナジー株式会社 | Secondary battery protection circuit and battery pack provided with the secondary battery protection circuit |
| US8148946B2 (en) | 2008-10-10 | 2012-04-03 | Mitsumi Electric Co., Ltd. | Battery pack having protection circuit for secondary battery |
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| KR101312263B1 (en) * | 2012-03-23 | 2013-09-25 | 삼성에스디아이 주식회사 | Vehicle and method for controlling the same |
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| CN109616608B (en) * | 2018-12-14 | 2022-06-07 | 宁德新能源科技有限公司 | Battery, electronic device, and battery pack |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130086108A (en) * | 2012-01-23 | 2013-07-31 | 미쓰미덴기가부시기가이샤 | Battery protection circuit and battery protection apparatus and battery pack |
| KR101932275B1 (en) | 2012-01-23 | 2018-12-24 | 미쓰미덴기가부시기가이샤 | Battery protection circuit and battery protection apparatus and battery pack |
| KR20170036321A (en) * | 2015-09-24 | 2017-04-03 | 주식회사 엘지화학 | Safety Unit Comprising Bypass Configured to Allow Electric Current to Flow Only When Discharging Battery Cell |
| KR102123672B1 (en) * | 2015-09-24 | 2020-06-16 | 주식회사 엘지화학 | Safety Unit Comprising Bypass Configured to Allow Electric Current to Flow Only When Discharging Battery Cell |
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| JP2004152580A (en) | 2004-05-27 |
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