JPS6158176A - Fuel cell - Google Patents

Abstract

PURPOSE:To make pressure uniform by using springs having different spring constant in accordance with fastening positions to a compression plate with clamping bolts. CONSTITUTION:Clamping bolts 4 are in contact with a compression plate 3 through springs 5 having small spring constant in portions which are in contact with the upper and the lower parts of manifold, and through springs 6 having larger spring constant in portions which are in contact with the center of a stack. Clamping bolts 4 located between stacks 2 and 2' are in contact with the compression plate 3 through springs 7 having spring constant two times larger than springs 6. Thereby, stacks 2 and 2' are uniformly pressed in all positions.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は燃料電池、特に積１？４型燃料電池の加圧均一
化に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to pressure equalization of fuel cells, particularly fuel cells of the 1-4 type.

従来の技術 従来、燃料電池は平板状の単位電池を多数積層し、両端
に１組の加圧板を当てて該加圧板な゛締付ボルト等の締
具：＝より締付加圧して、マニホールドをシールすると
ともに電極と固体状電解質、電極と集電板との接触をは
かっている。Conventional technology Conventionally, a fuel cell is made by stacking a large number of flat unit cells, applying a set of pressure plates to both ends, and applying pressure to the pressure plate with tightening bolts, etc. to close the manifold. In addition to sealing, it also ensures contact between the electrode and solid electrolyte, and the electrode and current collector plate.

発ＢＡが解決しよりとする問題点 上記構造においては、ヒートサイクルによる電池構成材
料の膨張収縮やクリープひずみなどによる加圧の弛緩を
防ぐ為、締具と加圧板の間（＝バネを介在させるのが普
通であった。しかしこの場合、マニホールド部と実質的
な電池部の構成材料の相違による応力−ひすみ挙動の相
違や加圧板そのもののひずみ等により、一種類のバネを
用いるだけでは加圧（；不均一が生じるという問題点が
あった。Problems that BA is recommended to solve In the above structure, in order to prevent relaxation of pressure due to expansion and contraction of battery constituent materials due to heat cycles, creep strain, etc., a spring is inserted between the fastener and the pressure plate. However, in this case, it is not possible to apply pressure using only one type of spring due to the difference in stress-strain behavior due to the difference in the constituent materials of the manifold part and the actual battery part, and the distortion of the pressure plate itself. (There was a problem that non-uniformity occurred.

問題点を解決するための手段 本発明は上記問題点を除去するもので、加圧板への締具
による締付は位置に応じてバネ定数の異なるバネを用い
該バネを介して加圧板を締付加圧するものである。Means for Solving the Problems The present invention eliminates the above problems, and uses springs with different spring constants depending on the position to tighten the pressure plate with a fastener. This applies additional pressure.

作用 その結果、加圧板への加圧が均一化されるものである。action As a result, the pressure applied to the pressure plate is made uniform.

実施例 次１；本発明の一実施例を図面ζ二より説明する。Example Next 1: An embodiment of the present invention will be explained with reference to drawing ζ2.

第１図り本発明になる燃料電池の正面図、第２図は同じ
く側面図である。燃料電池１は２組のスタック２．２′
よりなり、該スタック２．２′の両端に１組の加圧板３
．３′を当て締付ボルト４によって締付加圧される。締
付ボルト４は、上部および下部のマニホールドに相当す
る部分には、バネ定数の小さなバネ５を介して加圧板３
に接しておシ、実質的な電池部であるスタック中央部に
相当する部分には、より大きなバネ定数を有するバネ６
を介して加圧板３に接している。また２組のスタック２
．２′の間に位置する締付ボルト４はバネ６の２倍のバ
ネ定数を有するバネ７：：よって加圧板３に接する。こ
れによシ、加圧板３．３′に応力ひずみを生じるような
圧力によって加圧する場合でも電池スタック２．２′は
、その位置に応じて均一な加圧を受は安定した良好な電
池特性を得ることができ、また長寿命を達成することが
できた０ 発明の効果 上述のように本発明によれば、燃料電池における各スタ
ックへの加圧の不均一が防止され、安定した良好な電池
特性が得られまた長寿命となる等工業的価値大である。The first diagram is a front view of the fuel cell according to the present invention, and the second diagram is a side view. The fuel cell 1 has two stacks 2.2'
A set of pressure plates 3 are provided at both ends of the stack 2.2'.
．． 3' and tighten with the tightening bolt 4. The tightening bolt 4 is attached to a pressure plate 3 via a spring 5 with a small spring constant in the upper and lower parts corresponding to the manifolds.
A spring 6 with a larger spring constant is installed in the part corresponding to the center of the stack, which is the actual battery part.
It is in contact with the pressure plate 3 via. Also two stacks 2
．． The tightening bolt 4 located between the spring 2' and the spring 7 has a spring constant twice that of the spring 6. As a result, even when the battery stack 2.2' is pressurized with a pressure that causes stress strain on the pressure plate 3.3', the battery stack 2.2' receives uniform pressure depending on its position, resulting in stable and good battery characteristics. Effects of the Invention As described above, according to the present invention, uneven pressure is applied to each stack in a fuel cell, and stable and good quality can be achieved. It has great industrial value as it provides good battery characteristics and a long life.

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

第１図は本発明になる燃料電池の正面図、第２図は同じ
く側面図である。 ２．２′はスタック、３．３′は加圧板、４は締付ボル
ト、５はバネ定数の小さなバネ１．６はより大きなバネ
定数を有するバネ、７はバネ６の２倍のバネ定数を有す
るバネFIG. 1 is a front view of a fuel cell according to the present invention, and FIG. 2 is a side view of the same. 2.2' is a stack, 3.3' is a pressure plate, 4 is a tightening bolt, 5 is a spring with a small spring constant, 1.6 is a spring with a larger spring constant, 7 is a spring constant twice that of spring 6. spring with

Claims (1)

【特許請求の範囲】 １）多数の単位電池を積層してスタックとし、該スタッ
クの両端に加圧板を配し、該加圧板を締付ボルト等の複
数の締具で締付加圧する燃料電池において、締具の位置
に応じてバネ定数の異るバネを用い該バネを介して加圧
板を締付加圧することを特徴とする燃料電池。 ２）複数のスタックを一組の加圧板で一括加圧すること
を特徴とする特許請求の範囲第１項記載の燃料電池。[Claims] 1) In a fuel cell in which a large number of unit cells are stacked to form a stack, a pressure plate is arranged at both ends of the stack, and the pressure plate is tightened and pressurized with a plurality of fasteners such as tightening bolts. A fuel cell characterized in that a pressure plate is tightened and pressurized via a spring whose spring constant differs depending on the position of the fastener. 2) The fuel cell according to claim 1, wherein a plurality of stacks are pressurized all at once by a set of pressure plates.