JPH10334951A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JPH10334951A JPH10334951A JP9142495A JP14249597A JPH10334951A JP H10334951 A JPH10334951 A JP H10334951A JP 9142495 A JP9142495 A JP 9142495A JP 14249597 A JP14249597 A JP 14249597A JP H10334951 A JPH10334951 A JP H10334951A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- battery group
- discharging
- charging
- soc
- 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.)
- Granted
Links
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリチウムイオン２次
電池、特に充放電のタイミングが最適化されたリチウム
イオン２次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion secondary battery, and more particularly, to a lithium ion secondary battery in which charging and discharging timings are optimized.
【０００２】[0002]
【従来の技術】一般に、２次電池の劣化を防止するため
には、過充電、過放電を防止する必要がある。図６に
は、ニッケル−水素蓄電池の出力密度と充電状態（Ｓｔ
ａｔｅｏｆ Ｃｈａｒｇｅ：ＳＯＣ）との関係が示され
る。図６において、ＳＯＣの低下と共に出力密度も低下
している。なお、図６では、放電終止電圧が８．０Ｖ、
９．０Ｖ、１０．０Ｖのそれぞれについての出力密度が
示されている。図６からわかるように、ニッケル−水素
蓄電池の使用に適するＳＯＣの範囲には一定の上限、下
限があると考えられ、例えば２０％〜８０％が好適であ
ると考えられる。この範囲を外れて０％に近い領域及び
１００％に近い領域においてはそれぞれ過放電、過充電
によって電池の劣化が生じるおそれがある。2. Description of the Related Art Generally, in order to prevent deterioration of a secondary battery, it is necessary to prevent overcharge and overdischarge. FIG. 6 shows the output density and the state of charge (St) of the nickel-hydrogen storage battery.
ateof Charge (SOC). In FIG. 6, the output density also decreases as the SOC decreases. In FIG. 6, the discharge end voltage is 8.0 V,
Power densities for each of 9.0V and 10.0V are shown. As can be seen from FIG. 6, the range of the SOC suitable for use of the nickel-metal hydride storage battery is considered to have certain upper and lower limits, and for example, 20% to 80% is considered to be suitable. Outside of this range, there is a possibility that the battery may be deteriorated due to overdischarge and overcharge in a region close to 0% and a region close to 100%, respectively.
【０００３】このような事情はリチウムイオン２次電池
においても同様である。特開平４−３３１４２５号公報
には、リチウムイオン２次電池の過充電、過放電を防止
するための装置が開示されている。本従来例では、各リ
チウムイオン２次電池の端子間電圧を監視し、この電圧
に応じて充電及び放電の続行停止を制御することにより
電池の過充電、過放電を防止している。[0003] Such a situation is the same in a lithium ion secondary battery. Japanese Patent Application Laid-Open No. 4-331425 discloses an apparatus for preventing overcharge and overdischarge of a lithium ion secondary battery. In this conventional example, overvoltage and overdischarge of the battery are prevented by monitoring the voltage between the terminals of each lithium ion secondary battery and controlling the continuation of charging and discharging in accordance with the voltage.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来のリ
チウムイオン２次電池においては、充電用電池及び放電
用電池の区別がなく、充電放電を電池の使用条件の変化
に応じて切り替えていた。従って、例えば電気自動車等
に使用する場合に、回生電力をリチウムイオン２次電池
に受け入れる際に、電池の容量（ＳＯＣ）が高い場合に
は回生電力を回収できず、これを捨ててしまわなければ
ならなかった。このため回生効率が悪化するという問題
があった。また、このような回生効率の悪化を防止する
ために、無理に回収しようとすると、過充電のおそれが
あった。また、電池の使用条件によっては、ＳＯＣの低
くなった状態でもさらに負荷に電力を供給しなければな
らない場合も生じ、これによって過放電となるおそれも
あった。However, in the above-mentioned conventional lithium ion secondary battery, there is no distinction between a charging battery and a discharging battery, and the charging and discharging are switched according to a change in the use condition of the battery. Therefore, for example, when the regenerative power is received by the lithium ion secondary battery when used in an electric vehicle or the like, the regenerative power cannot be recovered if the battery has a high capacity (SOC) and must be discarded. did not become. For this reason, there was a problem that the regeneration efficiency deteriorated. Further, if the recovery is forcibly performed in order to prevent such deterioration of the regenerative efficiency, there is a risk of overcharging. Further, depending on the use condition of the battery, there is a case where the power must be further supplied to the load even in a state where the SOC is low, which may cause overdischarge.
【０００５】さらに、リチウムイオン２次電池等につい
ては、放電の際に発熱するので、これを冷却する必要が
あった。例えば、円筒型電池の場合には各電池缶に隙間
を与え放熱を確保したり、角形電池の場合、電池同士を
離してモジュール化する必要があった。この場合、確保
された隙間に、電池の冷却のための気体あるいは液体を
流す必要があった。このため、余分な電池スペースを確
保する必要があるという問題があった。Further, lithium ion secondary batteries and the like generate heat during discharge, and thus need to be cooled. For example, in the case of a cylindrical battery, it is necessary to provide a gap to each battery can to ensure heat dissipation, and in the case of a rectangular battery, it is necessary to separate the batteries to form a module. In this case, it is necessary to flow gas or liquid for cooling the battery through the secured gap. For this reason, there is a problem that extra battery space needs to be secured.
【０００６】本発明は上記従来の課題に鑑みなされたも
のであり、その目的は、過充電、過放電を防止でき、放
熱用の隙間を確保しなくても電池の温度調整をすること
ができるリチウムイオン２次電池を提供することにあ
る。The present invention has been made in view of the above-mentioned conventional problems, and has as its object to prevent overcharging and overdischarging, and to control the temperature of a battery without securing a heat radiation gap. An object of the present invention is to provide a lithium ion secondary battery.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、リチウムイオン２次電池であって、充電
用として使用される電池群と、放電用として使用される
電池群とを含み、これらの電池群の電池の充電状態が所
定範囲を外れた場合に、充電用の電池群と放電用の電池
群とを切り替えることを特徴とする。In order to achieve the above object, the present invention relates to a lithium ion secondary battery comprising a battery group used for charging and a battery group used for discharging. When the state of charge of the batteries of these battery groups is out of the predetermined range, the battery group for charging and the battery group for discharging are switched.
【０００８】また、上記発明において、充電用の電池群
と放電用の電池群とが交互に配置されていることを特徴
とする。Further, in the above invention, a battery group for charging and a battery group for discharging are alternately arranged.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態（以下
実施形態という）について、図面に基づいて説明する。Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.
【００１０】図１には、本発明に係るリチウムイオン２
次電池の構成例が示される。図１において、複数の電池
が直列又は並列又はその両方で接続され、これを電池Ａ
群とする。同様にして、他の複数の電池が直列又は並列
又はその両方で接続され、これを電池Ｂ群とする。電池
Ａ群に属する電池と電池Ｂ群に属する電池とは、図１に
示されるように、交互に配置されている。このとき、各
電池は密着した状態で配置される。なお、図１において
は、電池Ａ群に属する電池と電池Ｂ群に属する電池とが
千鳥状に配置されているが、必ずしもこれに限られるも
のではなく、電池Ａ群、電池Ｂ群に属するそれぞれの電
池が互いに隣接するように配置されるものであればよ
い。FIG. 1 shows a lithium ion 2 according to the present invention.
A configuration example of a secondary battery is shown. In FIG. 1, a plurality of batteries are connected in series or in parallel or both, and
Group. Similarly, a plurality of other batteries are connected in series or in parallel or both, and this is referred to as a battery B group. The batteries belonging to battery group A and the batteries belonging to battery group B are arranged alternately as shown in FIG. At this time, the batteries are arranged in close contact. In FIG. 1, the batteries belonging to the battery group A and the batteries belonging to the battery group B are arranged in a zigzag pattern. However, the present invention is not limited to this. Batteries may be arranged so as to be adjacent to each other.
【００１１】以上のような構成において、例えば、電池
Ａ群を充電用、電池Ｂ群を放電用として電気自動車等に
使用する場合、充電用である電池Ａ群は充電状態（ＳＯ
Ｃ）が２０％〜８０％の範囲で使用され、放電用である
電池Ｂ群はＳＯＣ８０％〜２０％の範囲で使用される。
これにより、例えば電気自動車等においてブレーキ時の
回生エネルギを回収する際に、常に回収先の電池群が確
保されることになり、電池のＳＯＣが高くて回収できな
いということを防止できる。これにより、回生エネルギ
を捨てなければならない状態をなくすことができ、回生
エネルギの回収効率を向上できる。また、放電用の電池
Ｂ群には、他の発電源例えば太陽電池や燃料電池等から
充電し、放電用の電池群として常に適切なＳＯＣを保持
することが可能である。なお、走行中に充電用の電池群
がＳＯＣ８０％に到達したりあるいは放電用の電池群が
ＳＯＣ２０％に低下した場合には、充電用の電池Ａ群と
放電用の電池Ｂ群とを電気的に切り替える構成としてお
けば、各電池群のＳＯＣに応じて用途を柔軟に変更する
ことが可能となる。In the above-mentioned configuration, for example, when the battery group A is used for charging and the battery group B is used for discharging in an electric vehicle or the like, the battery group A for charging is charged (SO
C) is used in the range of 20% to 80%, and the battery group B for discharging is used in the range of SOC 80% to 20%.
Thus, for example, when recovering the regenerative energy at the time of braking in an electric vehicle or the like, the battery group at the recovery destination is always secured, and it is possible to prevent the battery from having a high SOC and cannot be recovered. As a result, the state in which the regenerative energy must be discarded can be eliminated, and the recovery efficiency of the regenerative energy can be improved. The discharge battery group B can be charged from another power source, for example, a solar cell or a fuel cell, and can always maintain an appropriate SOC as the discharge battery group. When the battery group for charging reaches 80% SOC or the battery group for discharging decreases to 20% SOC during traveling, the battery group A for charging and the battery group B for discharging are electrically connected. In this case, the usage can be flexibly changed according to the SOC of each battery group.
【００１２】電池Ａ群、電池Ｂ群のＳＯＣの範囲を２０
〜８０％とするのは、過充電、過放電を防止するためで
ある。すなわち、ＳＯＣが８０％を超えた場合には、回
生エネルギが大きいときにこれを充電しきれなくなり、
あるいは無理に回収しようとして過充電となるおそれが
ある。また、ＳＯＣが２０％より小さい場合には、十分
な放電能力が確保されず、無理に放電させれば過放電と
なるおそれがある。さらに、ＳＯＣを低くしすぎると、
負極側の電極材料の表面に発生しているＬｉ2ＣＯ3等を
成分とする被膜が消失し、再度充電された時にこの被膜
が形成されるので、その分充放電効率が低下するという
問題がある。また、この場合電解液の分解を伴うためリ
チウムイオンが消費され、電池の劣化が生じるという問
題もある。以上のような理由から各電池群のＳＯＣを２
０〜８０％の範囲で管理するのが好適である。The SOC range of the battery group A and the battery group B is 20
The reason for setting it to 80% is to prevent overcharge and overdischarge. That is, when the SOC exceeds 80%, the battery cannot be fully charged when the regenerative energy is large,
Alternatively, there is a possibility that the battery may be overcharged in an attempt to recover it. If the SOC is less than 20%, sufficient discharge capacity is not secured, and if discharge is forcibly performed, overdischarge may occur. Furthermore, if the SOC is set too low,
Since the film containing Li 2 CO 3 and the like generated on the surface of the electrode material on the negative electrode side disappears, and this film is formed when the battery is charged again, there is a problem that the charge / discharge efficiency is reduced accordingly. is there. Further, in this case, there is a problem that lithium ions are consumed because the electrolytic solution is decomposed, and the battery is deteriorated. For the above reasons, the SOC of each battery group is set to 2
It is preferable to manage within the range of 0 to 80%.
【００１３】図２には、放電用として使用される電池群
に対して急速充電を行う動作のフロー図が示される。図
２において、電池Ａ群及び電池Ｂ群の電圧が比較され、
電圧の高い方の電池群が放電用として使用される（Ｓ
１）。なお、リチウムイオン２次電池の電池特性は、図
３に示されるように、ＳＯＣと電池の電圧との間に一定
の関係がある。すなわち、ＳＯＣの増加と共に電圧も高
くなる。従って、電池群の電圧をみることによりその電
池群のＳＯＣを知ることができる。本実施形態におい
て、電池Ａ群、電池Ｂ群のうち電圧の高い方を放電用の
電池群として使用するのは、その方がＳＯＣ８０％まで
の充電を短時間で実施することができるからである。FIG. 2 is a flowchart showing the operation of performing rapid charging of a battery group used for discharging. In FIG. 2, the voltages of the battery group A and the battery group B are compared,
The battery group with the higher voltage is used for discharging (S
1). Note that the battery characteristics of the lithium ion secondary battery have a certain relationship between the SOC and the voltage of the battery as shown in FIG. That is, the voltage increases as the SOC increases. Therefore, the SOC of the battery group can be known by checking the voltage of the battery group. In the present embodiment, the higher voltage of the battery group A and the battery group B is used as the battery group for discharging, because it can charge up to SOC 80% in a shorter time. .
【００１４】Ｓ１において電池Ａ群の電圧が高い場合に
は、電池Ａ群を充電用の電池群として使用し、電池Ａ群
に対して充電を行う（Ｓ２）。また、Ｓ１において電池
Ｂ群の電圧が高い場合には、電池Ｂ群に対して充電を行
う（Ｓ３）。If the voltage of the battery group A is high in S1, the battery group A is used as a battery group for charging, and the battery group A is charged (S2). If the voltage of the battery group B is high in S1, the battery group B is charged (S3).
【００１５】上記のようにして充電を行い、ＳＯＣ８０
％に相当する充電終止電圧に到達したか否かが判定され
（Ｓ４）、充電終止電圧に到達したところで充電動作が
終了する（Ｓ５）。The charging is performed as described above, and the SOC 80
It is determined whether or not the charging end voltage corresponding to% has been reached (S4), and when the charging end voltage has been reached, the charging operation ends (S5).
【００１６】本実施形態では、電池Ａ群、電池Ｂ群のう
ち電圧の高い方を充電して放電用に使用し、なおかつ充
電はＳＯＣ８０％までであるので、急速充電動作を短時
間で終了させることができる。In the present embodiment, the higher voltage of the battery group A and the battery group B is charged and used for discharging, and the charging is up to 80% SOC, so that the quick charging operation is completed in a short time. be able to.
【００１７】図４には、本発明に係るリチウムイオン２
次電池を電気自動車に使用した場合の、始動時および走
行中における充放電動作のフローが示される。図４にお
いて、始動時に電池Ａ群及び電池Ｂ群の電圧が比較さ
れ、電圧の高い電池群を放電用として使用する（Ｓ１
１）。FIG. 4 shows a lithium ion 2 according to the present invention.
The flow of the charging / discharging operation at the time of starting and during traveling when the secondary battery is used in the electric vehicle is shown. In FIG. 4, the voltages of the battery group A and the battery group B are compared at the time of starting, and the battery group having a higher voltage is used for discharging (S1).
1).
【００１８】電池Ａ群の電圧が高い場合には、電池Ａ群
を放電用として使用し（Ｓ１２）、電池Ａ群のＳＯＣが
２０％以上であるか否かが監視される（Ｓ１３）。電池
Ａ群のＳＯＣが２０％以上である場合には、電池Ｂ群の
ＳＯＣが８０％以上であるか否かが監視される（Ｓ１
４）。When the voltage of the battery group A is high, the battery group A is used for discharging (S12), and it is monitored whether or not the SOC of the battery group A is 20% or more (S13). When the SOC of the battery group A is 20% or more, it is monitored whether the SOC of the battery group B is 80% or more (S1).
4).
【００１９】Ｓ１３及びＳ１４において、電池Ａ群のＳ
ＯＣが２０％より小さいかあるいは電池Ｂ群のＳＯＣが
８０％以上である場合には、電池Ａ群、電池Ｂ群を切り
替える（Ｓ１５）。これは、電池Ａ群のＳＯＣが２０％
より低くなった場合には、放電用として十分な放電能力
が確保できず、かつ過放電のおそれがあるからである。
また、電池Ｂ群のＳＯＣが８０％以上である場合には、
回生エネルギの回収能力が十分でなく、かつ過充電とな
るおそれがあるからである。従って、いずれか一方の条
件が成立した場合には、電池Ａ群、電池Ｂ群を切り替
え、充電用及び放電用の電池群を切り替える。In steps S13 and S14, the S
When the OC is less than 20% or the SOC of the battery B group is 80% or more, the battery group A and the battery B group are switched (S15). This is because the SOC of battery group A is 20%
This is because if the voltage becomes lower, it is not possible to secure a sufficient discharge capacity for discharging and there is a risk of overdischarging.
When the SOC of the battery group B is 80% or more,
This is because the regenerative energy recovery capability is not sufficient, and the battery may be overcharged. Therefore, when either one of the conditions is satisfied, the battery group A and the battery group B are switched, and the battery group for charging and the battery group for discharging are switched.
【００２０】他方、Ｓ１１において電池Ｂ群の電圧が高
い場合には、電池Ｂ群を放電用として使用し（Ｓ１
６）、電池Ｂ群のＳＯＣが２０％以上であるか否かが監
視される（Ｓ１７）。電池Ｂ群のＳＯＣが２０％以上で
ある場合には、電池Ａ群のＳＯＣが８０％以上であるか
否かが確認される（Ｓ１８）。On the other hand, when the voltage of the battery group B is high in S11, the battery group B is used for discharging (S1).
6) It is monitored whether the SOC of the battery group B is 20% or more (S17). When the SOC of the battery group B is 20% or more, it is confirmed whether or not the SOC of the battery group A is 80% or more (S18).
【００２１】電池Ａ群を放電用として使用した場合と同
様に、Ｓ１７、Ｓ１８において電池Ｂ群のＳＯＣが２０
％より小さいかあるいは電池Ａ群のＳＯＣが８０％以上
となった場合には電池Ａ群、電池Ｂ群を切り替える（Ｓ
１９）。As in the case where the battery group A is used for discharging, the SOC of the battery group B becomes 20 in S17 and S18.
% Or the SOC of the battery A group is 80% or more, the battery A group and the battery B group are switched (S
19).
【００２２】以上の動作により、電池Ａ群及び電池Ｂ群
のＳＯＣに応じて適宜これらの電池群を充電用及び放電
用として使用し、必要に応じてこれらを切り替えること
ができる。これにより、充電用、放電用として適正なＳ
ＯＣの電池群が常に確保され、適正な放電能力を確保で
きるとともに、回生電力の回収先を常に確保することが
できる。With the above operation, these battery groups can be used for charging and discharging as appropriate according to the SOC of the battery group A and the battery group B, and these can be switched as needed. As a result, the proper S for charging and discharging
An OC battery group is always ensured, and an appropriate discharge capacity can be ensured, and a recovery destination of regenerative power can always be ensured.
【００２３】上述したように、図３には、リチウムイオ
ン２次電池の電池特性が示される。図３に示されるよう
に、リチウムイオン２次電池はＳＯＣが０％〜８０％で
充電される際に吸熱特性を示し、８０％〜１００％の充
電及び１００％〜０％までの放電時には発熱特性を示
す。従って、図１に示されるように、電池Ａ群、電池Ｂ
群をそれぞれ交互にかつ密着した状態で配置しておき、
これらの電池群のＳＯＣを適切な範囲で管理することに
より、充電側の吸熱と放電側の発熱とをバランスさせる
ことができる。これにより、特に冷却装置等を設けなく
ても、電池群の温度を所定レベルに維持することが可能
となる。なお、図３からわかるように、吸熱特性と発熱
特性の境目は、ＳＯＣ８０％の点であるので、これから
も電池群のＳＯＣの管理範囲を８０％以下とすることは
重要な意味を有する。As described above, FIG. 3 shows the battery characteristics of the lithium ion secondary battery. As shown in FIG. 3, the lithium ion secondary battery exhibits endothermic characteristics when charged at an SOC of 0% to 80%, and generates heat during charging from 80% to 100% and discharging from 100% to 0%. Show characteristics. Therefore, as shown in FIG.
Arrange the groups alternately and in close contact with each other,
By managing the SOC of these battery groups within an appropriate range, it is possible to balance heat absorption on the charging side and heat generation on the discharging side. Thus, the temperature of the battery group can be maintained at a predetermined level without providing a cooling device or the like. As can be seen from FIG. 3, the boundary between the heat absorption characteristics and the heat generation characteristics is the point at which the SOC is 80%. Therefore, it is important to keep the SOC management range of the battery group at 80% or less.
【００２４】図５には、図１のように配置した電池群を
使用して、ダイナミックストレス試験すなわち電気自動
車の実車走行を想定した充放電の繰り返し試験の結果が
示される。なお、図５においては、放電側の電池群の電
圧のみが示されているが、充電側の電池も同時に動作さ
せている。FIG. 5 shows the results of a dynamic stress test, that is, a repeated charge / discharge test assuming that an electric vehicle runs on an actual vehicle, using the battery group arranged as shown in FIG. Although FIG. 5 shows only the voltage of the battery group on the discharging side, the battery on the charging side is operated at the same time.
【００２５】図５からわかるように、電池群全体の温度
は、おおよそ２２℃〜２３℃の範囲に保たれている。従
って、図１に示されるような構成によって電池Ａ群、電
池Ｂ群を配置しておけば、冷却装置が必要なくなるとい
うことがわかる。これにより、例えば電池間に放熱用の
隙間を設ける必要等がなくなるので、電池をコンパクト
に設計することができる。As can be seen from FIG. 5, the temperature of the whole battery group is kept in a range of about 22 ° C. to 23 ° C. Therefore, it is understood that if the battery group A and the battery group B are arranged by the configuration as shown in FIG. 1, a cooling device is not required. Thus, for example, there is no need to provide a gap for heat dissipation between the batteries, and the battery can be designed compact.
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
電池群の充放電の切り替えタイミングを最適化すること
ができ、放電用電池のＳＯＣ及び充電用電池のＳＯＣを
それぞれ適切な範囲に維持することができる。この結
果、回生エネルギを無駄にすることがなくなる。また、
充電用電池群と放電用電池群の吸熱特性及び発熱特性を
組み合わせることにより、冷却装置を設けなくても電池
群の温度調整をすることが可能となる。As described above, according to the present invention,
The timing of switching between charging and discharging of the battery group can be optimized, and the SOC of the discharging battery and the SOC of the charging battery can be maintained in appropriate ranges. As a result, regenerative energy is not wasted. Also,
By combining the heat absorption characteristics and the heat generation characteristics of the charging battery group and the discharging battery group, the temperature of the battery group can be adjusted without providing a cooling device.
【図１】 本発明に係るリチウムイオン２次電池の構成
例を示す図である。FIG. 1 is a diagram showing a configuration example of a lithium ion secondary battery according to the present invention.
【図２】 本発明に係るリチウムイオン２次電池の放電
用の電池群を急速充電する動作のフロー図である。FIG. 2 is a flowchart of an operation of rapidly charging a battery group for discharging a lithium ion secondary battery according to the present invention.
【図３】 リチウムイオン２次電池の電池特性を示す図
である。FIG. 3 is a diagram showing battery characteristics of a lithium ion secondary battery.
【図４】 本発明に係るリチウムイオン２次電池の通常
使用時における充放電動作のフロー図である。FIG. 4 is a flowchart of a charge / discharge operation during normal use of the lithium ion secondary battery according to the present invention.
【図５】 図１に示された実施形態の充放電動作時の電
池群の温度を示す図である。FIG. 5 is a diagram showing a temperature of a battery group during a charge / discharge operation of the embodiment shown in FIG. 1;
【図６】 従来におけるニッケル−水素蓄電池の出力密
度とＳＯＣとの関係を示す図である。FIG. 6 is a diagram showing the relationship between the output density and SOC of a conventional nickel-hydrogen storage battery.
Claims (2)
用として使用される電池群とを含み、これらの電池群の
電池の充電状態が所定範囲を外れた場合に、充電用の電
池群と放電用の電池群とを切り替えることを特徴とする
リチウムイオン２次電池。1. A battery group comprising: a battery group used for charging; and a battery group used for discharging. When the state of charge of the batteries in these battery groups is out of a predetermined range, the battery group for charging is used. And a battery group for discharging.
において、前記充電用の電池群と放電用の電池群とが交
互に配置されていることを特徴とするリチウムイオン２
次電池。2. The lithium ion secondary battery according to claim 1, wherein the battery group for charging and the battery group for discharging are alternately arranged.
Next battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14249597A JP3367382B2 (en) | 1997-05-30 | 1997-05-30 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14249597A JP3367382B2 (en) | 1997-05-30 | 1997-05-30 | Lithium ion secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10334951A true JPH10334951A (en) | 1998-12-18 |
| JP3367382B2 JP3367382B2 (en) | 2003-01-14 |
Family
ID=15316666
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14249597A Expired - Fee Related JP3367382B2 (en) | 1997-05-30 | 1997-05-30 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3367382B2 (en) |
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| JP2001339868A (en) * | 2000-05-30 | 2001-12-07 | Sanyo Electric Co Ltd | Control method for charge/discharge of battery |
| JP2006324163A (en) * | 2005-05-20 | 2006-11-30 | Toyota Motor Corp | Assembly method of battery pack |
| JP2008084691A (en) * | 2006-09-27 | 2008-04-10 | Toyota Motor Corp | Battery unit and vehicle |
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