JPH11273643A - Set battery and housing body for set battery - Google Patents
Set battery and housing body for set batteryInfo
- Publication number
- JPH11273643A JPH11273643A JP10070003A JP7000398A JPH11273643A JP H11273643 A JPH11273643 A JP H11273643A JP 10070003 A JP10070003 A JP 10070003A JP 7000398 A JP7000398 A JP 7000398A JP H11273643 A JPH11273643 A JP H11273643A
- Authority
- JP
- Japan
- Prior art keywords
- unit cells
- battery
- housing
- buffer member
- unit cell
- 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
Landscapes
- Battery Mounting, Suspending (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば大型リチウ
ム二次電池等が電気的に接続された電気自動車用組電池
の構造及び組電池収容体に関するものであり、詳しくは
複数の電池が電気的に接続された組電池の構造及び組電
池用収容体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an assembled battery for an electric vehicle to which a large-sized lithium secondary battery or the like is electrically connected, and an assembled battery container. The present invention relates to a structure of a battery pack connected to a battery pack and a battery pack housing.
【０００２】[0002]
【従来の技術】複数の素電池が集合して電気的に接続さ
れた組電池が従来から知られている。この組電池は、最
近、残容量表示等の付加機能を加え、多様な用途へ対応
するべく電圧や容量を異にする様々な形状の組電池が生
産され、携帯用電源として市場に流通している。2. Description of the Related Art An assembled battery in which a plurality of unit cells are assembled and electrically connected has been conventionally known. Recently, battery packs of various shapes with different voltages and capacities have been produced to add various functions, such as display of remaining capacity, to meet various applications. I have.
【０００３】このような組電池の新しい用途として、近
年電気自動車用が加わりつつある。電気自動車用組電池
は、常に振動が加わる状態で使用されるので、素電池内
部における集電片の破断や集電溶接部の破断等の構造破
壊、素電池を電気的に接続した接続タブの破断等の振動
による不具合が発生しないようにしたいという耐振動性
面での要請がある。さらに、素電池性能の劣化原因とな
る素電池の温度上昇を防止するべく、素電池から発生す
る熱を外部に排出する構造にしたいという放熱面での要
請もある。[0003] As a new use of such an assembled battery, an electric vehicle has recently been added. Since the battery pack for electric vehicles is always used in a state where vibration is applied, structural breakage such as breakage of the current collecting pieces and breakage of the current collecting weld inside the unit cell, and the connection tabs that electrically connect the unit cells There is a demand in terms of vibration resistance that it is desired to prevent problems such as breakage from occurring due to vibration. Further, there is a demand in terms of heat radiation to provide a structure for discharging heat generated from the unit cells to the outside in order to prevent a rise in the temperature of the unit cells which causes deterioration of the unit cell performance.
【０００４】前述した耐振動性面での要請に応えるべく
開発されたものとして、従来、例えば特開平６−２０３
８２３号公報に記載のものがある。この技術によると、
素電池は内部の集電体と集電片とを圧迫接続するという
素電池内部の構造を変更して発電部材を素電池内に弾性
的に保持させ、もって、従来は問題であった振動が加わ
った際に溶接固定された集電片に応力が加わり切断する
という問題を解決している。しかし、この圧迫接続法式
では素電池内部の構造の変更が不可欠であるため、素電
池を製造するための部品及び素電池製造工程の一部変更
が必要であった。Japanese Patent Laid-Open Publication No. Hei 6-203 discloses a device which has been developed to meet the above-mentioned requirement in terms of vibration resistance.
No. 823 publication. According to this technology,
The unit cell changes the internal structure of the unit cell, which compresses and connects the internal current collector and the current collecting piece, to elastically hold the power generation member inside the unit cell. This solves the problem that the current-carrying piece fixed by welding when applied is cut by applying stress. However, in this compression connection method, it is indispensable to change the internal structure of the unit cell, so that parts for manufacturing the unit cell and a part of the unit cell manufacturing process need to be changed.
【０００５】また、耐振動性面での要請に応える他の方
法としては、振動を緩衝するためのゴムにより素電池を
収容体内部に固定する構造が一般的に知られている。[0005] As another method for responding to the demand for vibration resistance, a structure is generally known in which a unit cell is fixed in a housing with rubber for cushioning vibration.
【０００６】[0006]
【発明が解決しようとする課題】前記特開平６−２０３
８２３号公報に開示された圧迫接続方式の素電池は前述
したように耐振動性は高いが、従来の溶接方式に比べ集
電片と集電体との電気的接続が十分でないために接続部
の抵抗が増大し、大電流放電の際は電圧降下が大きいた
め電池容量が低下する等の電池特性における問題があ
り、これを使用した組電池は従来品を使用した組電池よ
り性能が低下するという問題がある。SUMMARY OF THE INVENTION The above-mentioned JP-A-6-203
The unit cell of the compression connection method disclosed in Japanese Patent Publication No. 823 has high vibration resistance as described above, but the electric connection between the current collecting piece and the current collector is not sufficient as compared with the conventional welding method. The resistance of the battery increases, and the voltage drop is large at the time of large current discharge.Therefore, there is a problem in battery characteristics such as a decrease in battery capacity, and the assembled battery using this has lower performance than the assembled battery using the conventional product. There is a problem.
【０００７】また、素電池を収容体内部にゴムにより固
定する方法では振動には強いが、ゴムの熱排出能力が低
いために、組電池内の素電池が充放電することにより発
生する熱による素電池の性能劣化を抑制することができ
ない。[0007] In the method of fixing the unit cells to the inside of the container with rubber, the method is strong against vibration, but due to the low heat discharging ability of rubber, the heat generated by charging and discharging of the unit cells in the assembled battery is low. Deterioration of the performance of the unit cell cannot be suppressed.
【０００８】つまり従来の技術では、例えば従来型の組
電池において、耐振動性の向上が必要な場合、素電池自
身を新規なものに変更する必要があった。しかもこの電
池では大電流を取り出そうとすると内部抵抗が高いため
に電圧降下が大きくなることにより素電池の容量が減少
し、これを用いた組電池は性能が低いという問題があっ
た。In other words, according to the conventional technique, for example, in a conventional battery pack, when the vibration resistance is required to be improved, it is necessary to change the unit cell itself to a new one. In addition, this battery has a problem that the capacity of the unit cell is reduced due to a large voltage drop due to a high internal resistance in order to take out a large current, and the battery using the same has low performance.
【０００９】さらに、素電池をゴムにより収容体内で固
定する方法では、組電池内の素電池の熱が効率的に排出
されないために熱による素電池の性能劣化を抑制するこ
とができず、組電池の性能が低いという問題があった。Further, in the method in which the unit cells are fixed in the housing with rubber, the heat of the unit cells in the assembled battery is not efficiently discharged, so that the performance deterioration of the unit cells due to the heat cannot be suppressed. There was a problem that the performance of the battery was low.
【００１０】本願発明は係る実状に鑑み考え出されたも
のであり、その目的は従来の内部構造を有する素電池を
用いながら振動および素電池より生じる熱による性能の
低下を抑制した、高性能な組電池を提供することであ
る。The present invention has been conceived in view of the above circumstances, and has as its object the purpose of using a unit cell having a conventional internal structure while suppressing a decrease in performance due to vibration and heat generated by the unit cell. It is to provide an assembled battery.
【００１１】[0011]
【課題を解決するための手段】請求項１に記載の組電池
は、電気的に接続された複数の素電池が電池収容体に固
定されており、前記電池収容体内壁と前記素電池の空間
に緩衝部材を備えることを特徴とする。According to a first aspect of the present invention, there is provided an assembled battery in which a plurality of electrically connected unit cells are fixed to a battery container, and a space between the inner wall of the battery container and the unit cell. Is provided with a buffer member.
【００１２】請求項１記載の本発明によると、組電池内
の緩衝部材が熱伝導性の弾性体である。これにより、緩
衝部材によって耐振動性面での要請に応えることができ
ながらも、素電池より発生した熱が緩衝部材を介して容
易に排出される。According to the first aspect of the present invention, the cushioning member in the battery pack is a thermally conductive elastic body. Thus, while the requirement of vibration resistance can be met by the buffer member, the heat generated from the unit cells is easily discharged through the buffer member.
【００１３】請求項２記載の発明によると、請求項１記
載の発明の構成に加えて、前記緩衝部材がゴムに金属粒
子が混入されたものからなることを特徴とする。According to a second aspect of the present invention, in addition to the configuration of the first aspect, the buffer member is made of rubber in which metal particles are mixed.
【００１４】これにより、緩衝部材の形状を自由に設定
することができる。このため既存の組電池への採用が容
易で、改造費用を低く抑えた製材性に優れる組電池を提
供することができる。Thus, the shape of the cushioning member can be freely set. Therefore, the present invention can provide an assembled battery which can be easily applied to an existing assembled battery, has a low remodeling cost, and has excellent lumber properties.
【００１５】請求項３記載の発明によると、請求項１ま
たは２記載の発明の構成に加え、前記緩衝部材はアルミ
ニウム、あるいは銅からなる金属粒子を含んでいること
を特徴とする。According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the buffer member includes metal particles made of aluminum or copper.
【００１６】これにより、素電池に発生した熱を効率よ
く収容体に伝えることができる。このため素電池の熱に
よる性能低下を抑制することができる。また、市場にお
いて比較的廉価であり入手が容易なものを用いているた
め、廉価な緩衝部材の作製が容易である。Thus, the heat generated in the unit cells can be efficiently transmitted to the container. For this reason, it is possible to suppress performance degradation due to heat of the unit cell. In addition, since a relatively inexpensive and easily available product is used in the market, it is easy to manufacture an inexpensive cushioning member.
【００１７】請求項４に記載の発明によると、請求項１
〜３のいずれかに記載の発明の構成に加え、前記緩衝部
材が、スチレンゴム、ブタジエンゴム、スチレンブタジ
エンゴム、ウレタンゴムの１つまたは２つ以上を含むこ
とを特徴とする。According to the invention described in claim 4, according to claim 1,
In addition to the configuration of the invention described in any one of Items 3 to 3, the buffer member includes one or more of styrene rubber, butadiene rubber, styrene butadiene rubber, and urethane rubber.
【００１８】これにより、緩衝部材として十分な特性を
有しながら、金属粒子とのなじみがよいために金属粒子
の凝集が起こりにくく特性の一定した緩衝部材が得られ
るため、品質の安定した組電池を提供することができ
る。[0018] Thus, while having sufficient characteristics as a buffer member, a buffer member having good characteristics is obtained because of good compatibility with the metal particles, and hence agglomeration of the metal particles is less likely to occur. Can be provided.
【００１９】請求項５に記載の発明によると、請求項１
〜４のいずれかに記載の発明の構成に加え、前記緩衝部
材の厚みが２〜１５ｍｍであることを特徴とする。According to the invention of claim 5, according to claim 1,
In addition to the configuration of the invention described in any one of Items 1 to 4, the thickness of the cushioning member is 2 to 15 mm.
【００２０】これにより、小体積で熱の排出に効果のあ
る緩衝部材として十分な特性を有する。厚さ２ｍｍ未満
では緩衝部材としての特性が十分でなく、１５ｍｍ以上
では熱排出の効果が薄れ、また組電池としてのエネルギ
ー密度の低下を招く。このため小体積の緩衝部材を用い
たエネルギー密度の高い組電池を提供することができ
る。[0020] Thereby, it has sufficient characteristics as a buffer member having a small volume and effective for discharging heat. If the thickness is less than 2 mm, the characteristics as a buffer member are not sufficient, and if it is 15 mm or more, the effect of heat release is weakened, and the energy density of the assembled battery is reduced. Therefore, it is possible to provide a battery pack having a high energy density using a small-volume buffer member.
【００２１】請求項６に記載の発明によると、電気的に
接続された複数の素電池を収容する組電池用収容体は熱
伝導性の緩衝部材を備えた収容体である。According to the sixth aspect of the present invention, the battery pack housing for housing a plurality of electrically connected unit cells is a housing having a thermally conductive buffer member.
【００２２】これにより、収容体内に素電池が収容され
た場合には、緩衝部材を介して素電池で発生する熱を効
率よく排出することができる。Thus, when the unit cell is accommodated in the container, the heat generated in the unit cell can be efficiently discharged through the buffer member.
【００２３】[0023]
【発明の実施の形態】以下に本発明の一実施の形態を、
図面を参照しながら説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.
This will be described with reference to the drawings.
【００２４】図１は、本発明に係る組電池及び組電池用
収容体の構造を説明するための分解斜視図である。この
組電池は、組電池を収容するための樹脂製の組電池容器
４と、複数（図面上では３個）の素電池１と、緩衝部材
３と、樹脂製の収容体蓋部５とから構成されている。FIG. 1 is an exploded perspective view for explaining the structure of a battery pack and a battery pack housing according to the present invention. This assembled battery includes a resin assembled battery container 4 for accommodating the assembled battery, a plurality of (three in the drawing) unit cells 1, a buffer member 3, and a resin housing lid 5. It is configured.
【００２５】素電池１は電池接続片２により接続され、
複数の素電池１が電気的に接続された状態となる。電気
的に接続された素電池１の両側面に緩衝部材３を敷設
し、収容体容器４に横向きに収容させた状態で収容体蓋
部５により蓋することにより、組電池１０が構成されて
いる。また、この緩衝部材は粒径５０μｍ〜１００μｍ
のアルミニウム粒子が３０重量％混入されたスチレンゴ
ムで構成されている。The cells 1 are connected by battery connecting pieces 2,
The plurality of unit cells 1 are electrically connected. The battery pack 10 is formed by laying the cushioning members 3 on both sides of the electrically connected unit cell 1 and covering it with the container lid 5 in a state of being laterally accommodated in the container 4. I have. The cushioning member has a particle size of 50 μm to 100 μm.
Of styrene rubber containing 30% by weight of aluminum particles.
【００２６】収容体容器４内で両端に位置する素電池１
には電流を取り出すための電流取り出し部２ａが接続さ
れ、収容体蓋部５外方に突出しており、組電池より電流
を取り出すことができるよう構成されている。The unit cells 1 located at both ends in the container 4
Is connected to a current take-out portion 2a for taking out a current, and protrudes outward from the housing cover 5, so that current can be taken out from the assembled battery.
【００２７】このような電気的に接続された素電池１の
上下に緩衝部材３を敷設し、収容体容器４に挿入保持さ
せた状態で収容体蓋部５により蓋した状態が図２に示さ
れている。本発明に係る組電池の完成した状態が図２に
示すものである。FIG. 2 shows a state in which the buffer members 3 are laid above and below the electrically connected unit cells 1 and are covered with the container lid 5 while being inserted and held in the container 4. Have been. FIG. 2 shows a completed state of the assembled battery according to the present invention.
【００２８】図３は組電池の他の例を示す一部切り欠き
斜視図である。この図３に示す組電池において、図１、
図２に示したものとの相違点は、緩衝部材３が素電池１
の周囲に連続して設けられている点である。このように
素電池１の側面に緩衝部材３が設けられることにより素
電池１の上下方向よりの振動に対して耐振動性が向上す
る。また、緩衝部材を介した伝熱により素電池に生ずる
熱が効率よく排出されるために素電池の劣化が抑制さ
れ、組電池の高性能化が可能となる。FIG. 3 is a partially cutaway perspective view showing another example of the assembled battery. In the battery pack shown in FIG.
The difference from the one shown in FIG.
Is provided continuously around the area. By providing the buffer member 3 on the side surface of the unit cell 1 in this way, the vibration resistance of the unit cell 1 against vibration in the vertical direction is improved. Further, since the heat generated in the unit cells by the heat transfer via the buffer member is efficiently discharged, the deterioration of the unit cells is suppressed, and the performance of the assembled battery can be improved.
【００２９】[0029]
【実施例】本発明の実施例を素電池の作製と組電池の組
み立てという項目に分け、実験に基づいてより具体的に
説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in more detail based on experiments by dividing them into items of unit cell fabrication and battery assembly.
【００３０】（素電池としてのリチウム二次電池の作
製）まず、正極活物質としてコバルト酸リチウムを用い
アルミニウム箔を集電体とする正極板と、負極活物質と
して黒鉛を用い銅箔を集電体とする負極板を、イオン透
過性のポリオレフィン製の微多孔膜を介して対抗するよ
うスパイラル状に多数回巻き取り、電極群本体を作製し
た。その後電極群を、支持電解質として６弗化燐酸リチ
ウムを１Ｍの濃度で含むエステル系有機電解液と共に電
池缶に挿入し、素電池１であるΦ６５×３００ｍｍの２
５０Ｗｈ級リチウム二次電池を作製した。(Preparation of Lithium Secondary Battery as Unit Cell) First, a positive electrode plate using lithium cobalt oxide as a positive electrode active material and an aluminum foil as a current collector, and a copper foil using graphite as a negative electrode active material and a copper foil The negative electrode plate as a body was spirally wound a number of times so as to oppose each other via a microporous membrane made of ion-permeable polyolefin, thereby producing an electrode group main body. Thereafter, the electrode group was inserted into a battery can together with an ester-based organic electrolytic solution containing lithium hexafluorophosphate at a concentration of 1 M as a supporting electrolyte, and a unit cell 2 of Φ65 × 300 mm was obtained.
A 50 Wh class lithium secondary battery was produced.
【００３１】（組電池の組み立て）前記の方法にて作製
した３本の素電池１を１本×３本となるよう配置し、接
続片２により直列に接続した。電気的に接続された素電
池１の両側面に、粒径５０μｍ〜１００μｍのアルミニ
ウム粒子を３０重量％含有するスチレンゴムからなる厚
さ１４ｍｍの緩衝部材３を敷設し、収容体容器４と収容
体蓋部５からなる収容体内に密封し、組電池１０を組み
立てた。(Assembly of assembled battery) The three unit cells 1 produced by the above-described method were arranged so as to have a size of 1 × 3, and were connected in series by connecting pieces 2. A 14 mm thick buffer member 3 made of styrene rubber containing 30% by weight of aluminum particles having a particle diameter of 50 μm to 100 μm is laid on both sides of the electrically connected unit cell 1, and a container 4 and a container The battery was sealed in the housing made up of the lid 5, and the assembled battery 10 was assembled.
【００３２】（比較例）上述の本実施例の組電池１０と
の性能の比較を行うため、比較例としての組電池を作製
した。この比較例の組電池は、金属粒子が何ら混入され
ていないスチレンゴムのみからなる緩衝部材３を使用す
る以外は本実施例のものと同様にして作製されたもので
ある。このようにして準備された本実施例の組電池と比
較例の組電池の性能を試す以下の実験１〜３を行った。(Comparative Example) In order to compare the performance with the battery pack 10 of the present embodiment, a battery pack as a comparative example was manufactured. The battery pack of this comparative example was manufactured in the same manner as that of the present example except that the buffer member 3 made of only styrene rubber containing no metal particles was used. The following experiments 1 to 3 were performed to test the performances of the assembled battery of the present example and the assembled battery of the comparative example prepared in this way.
【００３３】（実験１）実験１では、緩衝部材の材質
と、組電池の放電容量及び素電池温度の関係を調べた。
実験方法としては、緩衝部材の材質が異なる各組電池を
用いて下記の条件で振動試験を行い、振動試験前後に下
記の条件で充放電試験を行った。(Experiment 1) In Experiment 1, the relationship between the material of the buffer member, the discharge capacity of the assembled battery, and the cell temperature was examined.
As an experimental method, a vibration test was performed using the assembled batteries having different materials of the buffer member under the following conditions, and a charge / discharge test was performed under the following conditions before and after the vibration test.
【００３４】まず充放電試験として、組電池を２５℃の
恒温槽内に設置し、組電池の電圧が１２．３Ｖになるま
で８．７５Ａで充電した後、組電池の電圧が８．１Ｖに
なるまで７０Ａで放電を行った。尚、電池温度を中央の
素電池側面に貼り付けた熱電対により測定し、放電時の
最高到達温度を放電最高温度として記録した。First, as a charge / discharge test, the battery pack was placed in a constant temperature bath at 25 ° C., charged at 8.75 A until the battery voltage reached 12.3 V, and then the battery voltage was raised to 8.1 V. Discharge was performed at 70 A until the discharge was completed. The battery temperature was measured with a thermocouple attached to the side of the central unit cell, and the highest temperature at the time of discharge was recorded as the maximum discharge temperature.
【００３５】その後振動試験として、室温にて振動試験
器の試料固定部に素電池が横向き姿勢となるよう組電池
を固定し、素電池の横方向に周波数１００Ｈｚ振幅４ｃ
ｍの振動を１時間加えた。その後、振動試験後の容量を
確認するために上記の方法で充放電試験を行った。Thereafter, as a vibration test, the assembled battery was fixed to the sample fixing portion of the vibration tester at room temperature so that the unit cell was in the horizontal orientation, and the frequency was 100 Hz and the amplitude was 4 c.
m of vibration was applied for 1 hour. Thereafter, a charge / discharge test was performed by the above method to confirm the capacity after the vibration test.
【００３６】表１に振動試験の結果、即ち緩衝部材の材
質の異なる組電池における振動試験前後の放電容量を示
した。表１において、いずれの組電池も振動試験後も充
放電が可能であり、金属粒子含有の有無に関わらず同等
の放電容量を示した。この事から金属粒子が混入された
緩衝部材を使用しても何ら不具合のないことがわかる。Table 1 shows the results of the vibration test, that is, the discharge capacities before and after the vibration test in assembled batteries having different materials of the buffer member. In Table 1, all the assembled batteries were able to charge and discharge even after the vibration test, and showed the same discharge capacity regardless of the presence or absence of metal particles. From this, it can be seen that there is no problem even if a buffer member mixed with metal particles is used.
【００３７】[0037]
【表１】 [Table 1]
【００３８】表２に充放電試験の結果、即ち緩衝部材の
材質の異なる組電池における振動試験前後の放電最高温
度を示した。表２より、緩衝部材はゴム単独よりも金属
粒子を含有したほうは素電池温度が低く、その効果は振
動試験前後にわたり有効であるということがわかる。Table 2 shows the results of the charge / discharge test, that is, the maximum discharge temperatures before and after the vibration test in the assembled batteries having different buffer member materials. It can be seen from Table 2 that the buffer member containing the metal particles than the rubber alone has a lower cell temperature, and the effect is more effective before and after the vibration test.
【００３９】[0039]
【表２】 [Table 2]
【００４０】（実験２）この実験２では、緩衝部材の材
質と、組電池の充放電サイクル特性の関係を調べた。実
験方法としては、緩衝部材の材質が異なる実施例及び比
較例の組電池を用いて下記の条件で充放電サイクル特性
試験を行った。(Experiment 2) In Experiment 2, the relationship between the material of the buffer member and the charge / discharge cycle characteristics of the assembled battery was examined. As an experimental method, charge and discharge cycle characteristics tests were performed under the following conditions using the assembled batteries of Examples and Comparative Examples in which the material of the buffer member was different.
【００４１】組電池を２５℃の恒温槽内に設置し、組電
池の電圧が１２．３Ｖになるまで８．７５Ａで充電した
後、組電池の電圧が８．１Ｖになるまで７０Ａで放電す
るサイクルを１００回繰り返すという条件で充放電サイ
クル特性試験を行った。この充放電サイクルにおける初
回放電容量に対する１００サイクル後の放電容量の比率
をサイクル特性値とした。The battery pack is placed in a constant temperature bath at 25 ° C. and charged at 8.75 A until the voltage of the battery pack reaches 12.3 V, and then discharged at 70 A until the voltage of the battery pack reaches 8.1 V. A charge / discharge cycle characteristic test was performed under the condition that the cycle was repeated 100 times. The ratio of the discharge capacity after 100 cycles to the initial discharge capacity in this charge / discharge cycle was taken as the cycle characteristic value.
【００４２】この結果を図４及び表３に示す。図４には
緩衝部材の材質の異なる組電池の充放電サイクルに伴う
容量変化を、また、表３にはサイクル特性値を示した。
図４より、緩衝部材がゴム単独よりも金属粒子を含有し
たものの充放電サイクルに伴う容量低下が抑制されてお
り、金属粒子の混入が有効であることが実証された。ま
た、表３より、緩衝部材が金属粒子を含有することによ
りサイクル特性値が１０％以上向上することがわかる。FIG. 4 and Table 3 show the results. FIG. 4 shows a change in capacity of a battery pack having a different material of the buffer member due to charge / discharge cycles, and Table 3 shows cycle characteristic values.
From FIG. 4, although the buffer member contained metal particles rather than the rubber alone, the capacity reduction due to the charge / discharge cycle was suppressed, and it was proved that the mixing of the metal particles was effective. Also, from Table 3, it can be seen that the cycle characteristics are improved by 10% or more when the buffer member contains metal particles.
【００４３】[0043]
【表３】 [Table 3]
【００４４】（実験３）実験３では、緩衝部材の厚み
と、組電池の電池特性の関係を調べた。実験方法として
は、本実施例の組電池における緩衝部材の厚みを様々に
変化させながら前述の条件で振動試験を行い、振動試験
後に前述の条件で充放電試験を行った。(Experiment 3) In Experiment 3, the relationship between the thickness of the buffer member and the battery characteristics of the assembled battery was examined. As an experimental method, a vibration test was performed under the above-mentioned conditions while varying the thickness of the cushioning member in the battery pack of this example, and a charge-discharge test was performed under the above-described conditions after the vibration test.
【００４５】この結果を図５に示す。図５に緩衝部材の
厚みの異なる組電池の振動試験後の放電容量を示してい
る。この図５から、緩衝部材の厚みが２ｍｍ以上では放
電容量の増加が認められた。２ｍｍよりも薄い場合に組
電池性能が低下する原因を調べるために実験後組電池を
解体して調査した結果、緩衝部材が２ｍｍよりも薄い場
合には素電池内部で活物質の集電体からの脱落が確認さ
れた。また、緩衝部材の厚みが１５ｍｍを超えても放電
容量の増加は認められなかった。このことより、緩衝部
材としての有効性の点から緩衝部材厚みが２ｍｍ以上で
あり、組電池のエネルギー密度向上の観点から緩衝部材
の厚みは１５ｍｍ以下で十分効果を有していることがわ
かる。FIG. 5 shows the result. FIG. 5 shows the discharge capacities of the assembled batteries having different thicknesses of the buffer members after the vibration test. From FIG. 5, it was found that the discharge capacity increased when the thickness of the buffer member was 2 mm or more. When the battery was disassembled after the experiment to investigate the cause of the deterioration of the battery performance when the thickness was smaller than 2 mm, the battery was disassembled after the experiment. Was confirmed to have dropped off. Also, even if the thickness of the buffer member exceeded 15 mm, no increase in the discharge capacity was observed. From this, it can be seen that the thickness of the buffer member is 2 mm or more from the viewpoint of the effectiveness as the buffer member, and that the thickness of the buffer member is 15 mm or less from the viewpoint of improving the energy density of the assembled battery, which is sufficiently effective.
【００４６】金属粒子を含有したゴムである緩衝部材は
素電池毎に対応して個別に設けられるだけでなく、例え
ば図３に示すように連結された形状のものでもよい。ま
た、素電池から電気的接続が可能となるよう孔を穿設す
るなどの細工が施された緩衝部材を素電池周囲に敷設
し、緩衝部材の周囲に配置した接続タブにより電気的に
接続させる構造であってもよい。The buffer member made of rubber containing metal particles may be provided not only individually for each unit cell but also in a connected shape as shown in FIG. 3, for example. In addition, a buffer member that has been subjected to work such as drilling a hole so as to enable electrical connection from the unit cell is laid around the unit cell, and electrically connected by connection tabs arranged around the buffer member. It may be a structure.
【００４７】緩衝部材に含有される金属粒子の形状は、
材料強度の維持向上の観点より亀裂成長末端であるクラ
ックの発生の抑制に有利ななだらかな面で構成されたも
のが好ましく、更に望ましくは球状である。The shape of the metal particles contained in the cushioning member is as follows:
From the viewpoint of maintaining and improving the strength of the material, those having a gentle surface that is advantageous for suppressing the generation of cracks, which are crack growth terminals, are preferable, and more preferably spherical.
【００４８】また、緩衝部材に含有される金属粒子の粒
径が５０μｍ〜１００μｍ程度であると金属粒子がゴム
中で容易に分散するため、安定した物性の緩衝部材を容
易に作製することができる。When the particle size of the metal particles contained in the cushioning member is about 50 μm to 100 μm, the metal particles are easily dispersed in the rubber, so that a cushioning member having stable physical properties can be easily produced. .
【００４９】緩衝部材の作製方法としては、比重の異な
る原材料を用いて互いに均一分散させる必要があるた
め、原材料として粉末状のゴムと金属粒子を用いて、こ
れらを粉末同士で攪拌混合したのち成型する方法により
作製することが望ましい。As a method of manufacturing the cushioning member, since it is necessary to uniformly disperse each other using raw materials having different specific gravities, powdery rubber and metal particles are used as raw materials, and these are stirred and mixed with each other, and then molded. It is desirable to manufacture by the method of performing.
【００５０】尚、緩衝部材の母材である金属粒子が混入
されたゴムは、スチレンブタジエンゴムやビニルピリジ
ンスチレンブタジエンゴム、スチレンイソプレンスチレ
ンゴム等のスチレンゴムや、ブタジエンゴム、アクリロ
ニトリルブタジエンゴム、エチレンプロピレンゴム等の
ビニルゴム、ウレタンゴム、アクリルゴム、更にそれら
のジカルボン酸ビニルモノマー等によるカルボン酸変性
物、水素化物等を単独あるいは複数種を混合して用いる
ことが可能である。The rubber mixed with metal particles, which is the base material of the cushioning member, may be styrene rubber such as styrene butadiene rubber, vinylpyridine styrene butadiene rubber, styrene isoprene styrene rubber, butadiene rubber, acrylonitrile butadiene rubber, ethylene propylene. It is possible to use vinyl rubber such as rubber, urethane rubber, acrylic rubber, a carboxylic acid-modified product thereof with a vinyl dicarboxylate monomer or the like, a hydride alone, or a mixture of plural types.
【００５１】また、本発明に開示される収容体容器は、
特開平９−８６１８８号公報に開示される組電池収容体
のような空冷用の孔を有する必要はない。このことによ
り、従来品と同形状の組電池が設計可能となるため、収
容体の形状変更に伴う多額の費用が発生もなく、現行の
組電池に容易に採用可能であり汎用性に優れている。ま
た組電池内部に不純物が侵入することもなく、組電池の
性能を良好に保持することが可能である。[0051] The container body disclosed in the present invention comprises:
It is not necessary to have a hole for air cooling as in the battery pack container disclosed in JP-A-9-86188. This makes it possible to design a battery pack having the same shape as that of the conventional product, so that there is no need for a large amount of cost associated with the change in the shape of the container, and the battery can be easily adopted in existing battery packs and has excellent versatility. I have. Further, the performance of the assembled battery can be maintained satisfactorily without impurities entering the interior of the assembled battery.
【００５２】今回開示された実施の形態はすべての点で
例示であって、制限的なものではないと考えるべきであ
る。本発明の範囲は、上記した説明ではなく特許請求の
範囲によって示され、特許請求の範囲と均等の意味及び
範囲内ですべての変更が含まれることが意図される。The embodiment disclosed this time is merely an example in all respects, and should not be construed as limiting. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
【００５３】[0053]
【発明の効果】請求項１に記載の本発明によれば、組電
池は電池収容体内壁と前記素電池の空間に熱伝導性の弾
性体よりなる緩衝部材を備えているため、緩衝部材によ
る緩衝作用により耐振動性面での要請に応えることがで
きながらも、素電池より発生した熱を緩衝部材を介して
容易に排出することができ、熱による素電池の性能低下
が抑制された組電池を提供することができる。また、こ
のような耐振動性及び放熱性の両要請に応えるにおい
て、必ずしも素電池の内部構造の変更を必要としないた
め、従来の素電池製造部品及び製造工程を変更しなくて
すむ利点もある。According to the first aspect of the present invention, since the battery pack is provided with a buffer member made of a thermally conductive elastic body on the inner wall of the battery housing and the space of the unit cell, the battery member uses the buffer member. An assembly that can meet the requirements of vibration resistance due to the buffering function, but can easily discharge the heat generated from the unit cell through the buffer member, and suppress the performance deterioration of the unit cell due to the heat. A battery can be provided. Further, in order to meet such requirements of both vibration resistance and heat dissipation, it is not always necessary to change the internal structure of the unit cell, so that there is an advantage that the conventional unit manufacturing parts and manufacturing process of the unit cell need not be changed. .
【００５４】請求項２に記載の本発明によれば、請求項
１に記載の発明の効果に加え、前記緩衝部材が金属粒子
を含むゴムであるため、緩衝部材の形状を自由に設定す
ることができる。このため既存の組電池への採用が容易
で、改造費用を低く抑えた組電池を提供することができ
る。According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the shape of the cushioning member can be freely set because the cushioning member is made of rubber containing metal particles. Can be. For this reason, it is easy to adopt it to an existing battery pack, and it is possible to provide a battery pack with low modification cost.
【００５５】請求項３記載の本発明によれば、請求項１
または２記載の発明の効果に加え、前記緩衝部材はアル
ミニウム、あるいは銅からなる金属粒子を含んでいるた
め、素電池に発生した熱を効率よく収容体に伝えること
ができ、素電池の熱による性能低下を抑制し、さらに高
性能な組電池を提供することができる。また、市場で入
手が容易であるため緩衝部材の作製も容易である。According to the third aspect of the present invention, a first aspect is provided.
Or In addition to the effects of the invention described in 2 above, since the buffer member contains metal particles made of aluminum or copper, the heat generated in the unit cell can be efficiently transmitted to the container, and the heat generated by the unit cell It is possible to provide a high-performance battery pack that suppresses performance degradation. Further, since it is easily available on the market, it is easy to manufacture the cushioning member.
【００５６】請求項４記載の本発明によれば、請求項１
〜３のいずれかに記載の発明の効果に加え、前記緩衝部
材が、スチレンゴム、ブタジエンゴム、スチレンブタジ
エンゴム、ウレタンゴムの１つまたは２つ以上からなる
ため、緩衝部材として十分な特性を有しながら金属粒子
とのなじみがよいために金属粒子の凝集が起こりにく
く、特性の一定した緩衝部材が得られ品質の安定した組
電池を提供することができる。According to the present invention described in claim 4, according to claim 1,
In addition to the effects of the invention described in any one of the above-described items 3, since the buffer member is made of one or more of styrene rubber, butadiene rubber, styrene butadiene rubber, and urethane rubber, it has sufficient characteristics as a buffer member. However, since the metal particles are well compatible with the metal particles, aggregation of the metal particles is unlikely to occur, so that a buffer member having constant characteristics can be obtained, and a battery pack having stable quality can be provided.
【００５７】請求項５に記載の本発明によれば、請求項
１〜４のいずれかに記載の発明の構成に加え、前記緩衝
部材の厚みが２〜１５ｍｍであるため、小体積で熱の排
出に効果のある緩衝部材として十分な特性を有する。こ
のため小体積の緩衝部材を用いたエネルギー密度の高い
組電池を提供することができる。According to the fifth aspect of the present invention, in addition to the constitution of any one of the first to fourth aspects, the thickness of the buffer member is 2 to 15 mm. It has sufficient characteristics as a buffer member effective for discharge. Therefore, it is possible to provide a battery pack having a high energy density using a small-volume buffer member.
【００５８】請求項６に記載の本発明によると、熱伝導
性の緩衝部材を備えた収容体であるため緩衝部材を介し
て素電池で発生する熱が効率よく排出される効果があ
る。According to the sixth aspect of the present invention, since the container is provided with a heat conductive buffer member, there is an effect that heat generated in the unit cell is efficiently discharged through the buffer member.
【図１】本発明の実施例における組電池の分解斜視図で
ある。FIG. 1 is an exploded perspective view of an assembled battery according to an embodiment of the present invention.
【図２】本発明の実施例における組電池の構造を示す斜
視図である。FIG. 2 is a perspective view illustrating a structure of a battery pack according to an embodiment of the present invention.
【図３】本発明の実施例における組電池の構造の別形態
を示す部分切り欠き斜視図である。FIG. 3 is a partially cutaway perspective view showing another embodiment of the structure of the battery pack in the embodiment of the present invention.
【図４】材質の異なる緩衝部材を用いた組電池の充放電
サイクル特性を示すグラフである。FIG. 4 is a graph showing charge / discharge cycle characteristics of an assembled battery using buffer members made of different materials.
【図５】厚みの異なる緩衝部材を用いた組電池の振動試
験後の放電容量を示すグラフである。FIG. 5 is a graph showing a discharge capacity after a vibration test of an assembled battery using buffer members having different thicknesses.
１ 素電池 ２ 電池接続片 ２ａ 電流取り出し部 ３ 緩衝部材の一例としての金属粒子含有ゴム製板 ４ 収容体容器 ５ 収容体蓋部 １０ 組電池 DESCRIPTION OF SYMBOLS 1 Unit cell 2 Battery connection piece 2a Current extraction part 3 Rubber plate containing metal particles as an example of a buffer member 4 Container 5 Container lid 10 Battery assembly
───────────────────────────────────────────────────── フロントページの続き (72)発明者 米津 育郎 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 西尾 晃治 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ikuro Yonezu 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Koji Nishio 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.
Claims (6)
して用いられる組電池であって、 複数の素電池と前記素電池を収容する収容体と、 前記収容体内に収容された前記素電池と当該収容体の内
壁面との間に介在し、熱伝導性の弾性体からなる緩衝部
材とを有する、組電池。1. An assembled battery in which a plurality of unit cells are electrically connected to each other and used as a power source, comprising: a plurality of unit cells; a housing for housing the unit cells; and the unit cells housed in the housing. And a buffer member interposed between the housing and an inner wall surface of the housing and made of a thermally conductive elastic body.
なる、請求項１に記載の組電池。2. The battery pack according to claim 1, wherein the buffer member is made of rubber containing metal particles.
銅粒子を２０〜４０重量％含むゴムからなる、請求項１
または２記載の組電池。3. The cushioning member according to claim 1, wherein the cushioning member is made of a rubber containing 20 to 40% by weight of aluminum particles or copper particles.
Or the battery pack according to 2.
エンゴム、ウレタンゴムの１つまたは２つ以上からな
る、請求項１〜３のいずれかに記載の組電池。4. The battery pack according to claim 1, wherein the buffer member is made of one or more of styrene rubber, butadiene rubber, and urethane rubber.
である、請求項１〜４のいずれかに記載の組電池。5. The thickness of the cushioning member is 2 mm to 15 mm.
The assembled battery according to any one of claims 1 to 4, wherein
容する組電池用収容体であって、 組電池収容体の内壁と収容状態の前記素電池との間に介
在する状態となる緩衝部材を含み、 前記緩衝部材が熱伝導性の緩衝部材である、組電池用収
容体。6. An assembled battery housing for housing a plurality of batteries in an electrically connected state, wherein the buffer is in a state interposed between an inner wall of the assembled battery housing and the housed unit cells. A housing for an assembled battery, including a member, wherein the buffer member is a thermally conductive buffer member.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07000398A JP3573949B2 (en) | 1998-03-19 | 1998-03-19 | Battery pack |
| US09/272,571 US6270920B1 (en) | 1998-03-19 | 1999-03-19 | Battery module and container for battery module |
| US09/799,034 US6645664B2 (en) | 1998-03-19 | 2001-03-06 | Battery module and container for battery module |
| US10/261,782 US6913852B2 (en) | 1998-03-19 | 2002-10-02 | Battery module and container for battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07000398A JP3573949B2 (en) | 1998-03-19 | 1998-03-19 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11273643A true JPH11273643A (en) | 1999-10-08 |
| JP3573949B2 JP3573949B2 (en) | 2004-10-06 |
Family
ID=13419008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07000398A Expired - Fee Related JP3573949B2 (en) | 1998-03-19 | 1998-03-19 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3573949B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1501135A2 (en) * | 2003-07-22 | 2005-01-26 | Polymatech Co., Ltd. | Thermally conductive holder |
| JP2005056837A (en) * | 2003-07-22 | 2005-03-03 | Polymatech Co Ltd | Heat-conductive holder |
| US7276313B2 (en) | 2002-06-03 | 2007-10-02 | Nissan Motor Co., Ltd. | Battery and related method |
| US7504179B2 (en) | 2002-05-08 | 2009-03-17 | Nissan Motor Co., Ltd. | Secondary cell module and method of its production |
| JP2009283148A (en) * | 2008-05-19 | 2009-12-03 | Furukawa Battery Co Ltd:The | Battery pack module |
| KR101005607B1 (en) | 2006-10-30 | 2011-01-05 | 주식회사 엘지화학 | Battery Module Including Damping Member |
| JP2013062092A (en) * | 2011-09-12 | 2013-04-04 | Fdk Tottori Co Ltd | Impact alleviating material for battery pack, battery pack |
| US8785033B2 (en) | 2001-09-17 | 2014-07-22 | Nissan Motor Co., Ltd. | Assembled battery |
| WO2017122438A1 (en) * | 2016-01-15 | 2017-07-20 | ソニー株式会社 | Battery pack |
-
1998
- 1998-03-19 JP JP07000398A patent/JP3573949B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8785033B2 (en) | 2001-09-17 | 2014-07-22 | Nissan Motor Co., Ltd. | Assembled battery |
| US7504179B2 (en) | 2002-05-08 | 2009-03-17 | Nissan Motor Co., Ltd. | Secondary cell module and method of its production |
| US7276313B2 (en) | 2002-06-03 | 2007-10-02 | Nissan Motor Co., Ltd. | Battery and related method |
| EP1501135A2 (en) * | 2003-07-22 | 2005-01-26 | Polymatech Co., Ltd. | Thermally conductive holder |
| JP2005056837A (en) * | 2003-07-22 | 2005-03-03 | Polymatech Co Ltd | Heat-conductive holder |
| US7324343B2 (en) | 2003-07-22 | 2008-01-29 | Polymatech Co., Ltd. | Thermally conductive holder |
| EP1501135A3 (en) * | 2003-07-22 | 2008-07-02 | Polymatech Co., Ltd. | Thermally conductive holder |
| KR101005607B1 (en) | 2006-10-30 | 2011-01-05 | 주식회사 엘지화학 | Battery Module Including Damping Member |
| JP2009283148A (en) * | 2008-05-19 | 2009-12-03 | Furukawa Battery Co Ltd:The | Battery pack module |
| JP2013062092A (en) * | 2011-09-12 | 2013-04-04 | Fdk Tottori Co Ltd | Impact alleviating material for battery pack, battery pack |
| WO2017122438A1 (en) * | 2016-01-15 | 2017-07-20 | ソニー株式会社 | Battery pack |
| US11283120B2 (en) | 2016-01-15 | 2022-03-22 | Murata Manufacturing Co., Ltd. | Battery pack |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3573949B2 (en) | 2004-10-06 |
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