阅读说明：本技术 二次电池用密封垫 (Gasket for secondary battery ) 是由 柳得德 土田浩 斋藤和史 于 2018-06-22 设计创作，主要内容包括：提供一种二次电池用密封垫,该二次电池用密封垫即使在层叠有多个电池堆部件时的间隔(过盈量)存在偏差的情况下,也能够形成合适的密封面,发挥稳定的密封性能,还能够将密封体压缩时的密封宽度的扩大抑制到最小限度。一种二次电池用密封垫(1),配置于二次电池的电池堆部件之间,其包括：平板状的框体(2),具有沿所述电池堆部件(201)的外周侧密封对象部位而成的形状；和密封体(4),为环状的密封体(4),由弹性材料形成,且贴附于框体密封侧端缘部,该密封体(4)具有：密封凸起部(4a),为环状的密封凸起部(4a),沿密封侧端缘部(3)的整个周长形成,且比相邻的电池堆部件(201)的间隔厚,该密封凸起部(4a)沿密封侧端缘部(3)的整个周长具有至少1条环状凹条部(4b)。(Provided is a gasket for a secondary battery, which can form an appropriate sealing surface, exhibit stable sealing performance, and suppress expansion of the sealing width during compression of a sealing body to the minimum even when there is variation in the interval (interference) when a plurality of stack components are stacked. A gasket (1) for a secondary battery, which is arranged between stack members of the secondary battery, comprising: a flat plate-shaped frame (2) having a shape formed along a portion to be sealed on the outer peripheral side of the cell stack member (201); and a sealing body (4) which is an annular sealing body (4) and is formed by an elastic material and is adhered to the edge part of the sealing side of the frame body, wherein the sealing body (4) comprises: and a sealing protrusion (4a) which is an annular sealing protrusion (4a) formed along the entire circumference of the sealing-side end edge (3) and thicker than the interval between adjacent stack members (201), wherein the sealing protrusion (4a) has at least 1 annular recessed portion (4b) along the entire circumference of the sealing-side end edge (3).)

1. A gasket for a secondary battery, which is disposed between stack members of the secondary battery, comprising:

a flat plate-like frame body having a shape formed along an outer peripheral side sealing target portion of the cell stack member; and

a seal body which is an annular seal body, is formed of an elastic material, and is attached to a seal-side end edge portion of the frame body, the seal body having:

and a seal protrusion portion that is an annular seal protrusion portion formed along an entire circumferential length of the seal-side end edge portion and is thicker than a space between adjacent ones of the stack members, the seal protrusion portion having at least 1 annular groove portion along the entire circumferential length of the seal-side end edge portion.

2. The gasket for secondary batteries according to claim 1, wherein,

the sealing bulge is provided with at least 2 annular concave strip parts.

3. The gasket for secondary batteries according to claim 1 or 2, wherein,

the frame body has a recess on one surface of the seal-side end edge portion.

4. The gasket for secondary batteries according to claim 1 or 2, wherein,

the frame body has recesses on both surfaces of the seal-side end edge portion.

5. The gasket for secondary batteries according to any one of claims 1 to 4, wherein,

the thickness of the seal-side end edge portion of the frame is thinner than the interval between the adjacent cell stack members.

Technical Field

The present invention relates to a gasket for a secondary battery.

Background

In a stacked secondary battery in which a plurality of stacks are stacked, each stack includes a flat plate-shaped stack member, i.e., a positive electrode plate, a negative electrode plate, and a separator disposed between the electrode plates. Active material is filled between each electrode plate and the separator. The stack components are integrally fastened in the stacking direction by, for example, bolts and nuts.

As shown in fig. 10, a gasket 101 is disposed on the outer peripheral portion between the stack components 201. The gasket 101 is a framed gasket 101 in which a sealing body 104 is attached to a sealing-side end edge portion (inner circumferential portion) 103 of a frame 102, for example (for example, japanese patent application laid-open No. 2011-238364).

As shown in fig. 11, if the position of the seal body 104 is displaced between the stack members 201, the seal surfaces of the stacked stack members 201 are displaced, and the stack members (thin-film metal) 201 are bent, so that an appropriate interference cannot be secured. The framed gasket 101 has high accuracy in the initial position of the sealing body 104, and can ensure an appropriate interference without causing displacement of the sealing surface when the stack members 201 are stacked and the sealing body 104 is crushed, and without bending the stack members 201.

Disclosure of Invention

Technical problem to be solved by the invention

With respect to the conventional framed gasket 101, there is a fear that: when the interval (interference) between the stacked cell stack materials 201 varies, a proper sealing surface cannot be formed, and stable sealing performance cannot be exhibited.

If the seal body 104 is thickened to form a seal surface, there is a concern that: when the sealing body 104 is compressed, the sealing width is increased, and the sealing body 104 is immersed in the active material side, which results in a reduction in the effective area of the electrode plate.

The purpose of the present invention is to provide a gasket for a secondary battery, which can form an appropriate sealing surface even when there is variation in the interval (interference) when a plurality of stack components are stacked, can exhibit stable sealing performance, and can suppress the expansion of the sealing width when a sealing body is compressed to a minimum.

Means for solving the problems

Drawings

Fig. 1 is a sectional view showing a gasket for a secondary battery of a first embodiment;

fig. 2(a) is a sectional view of a secondary battery gasket according to a first embodiment, and (b) is a sectional view of a conventional secondary battery gasket;

fig. 3 is a sectional view showing a state of use of the gasket for a secondary battery according to the first embodiment;

fig. 4 is a cross-sectional view of a gasket for a secondary battery having a double annular groove;

fig. 5 is a sectional view of a gasket for a secondary battery having a triple annular groove;

fig. 6 is a cross-sectional view of a secondary battery gasket in which the number of annular grooves is different on the front and back surfaces of the sealing body;

fig. 7(a) is a cross-sectional view showing an example of compression of the secondary battery gasket, and (b) is a partially enlarged cross-sectional view of (a);

fig. 8 is a sectional view showing a gasket for a secondary battery of the second embodiment;

fig. 9 is a sectional view showing a gasket for a secondary battery of a third embodiment;

fig. 10 is a sectional view showing a conventional gasket for a secondary battery;

fig. 11 is a sectional view showing a technical problem in a conventional gasket for a secondary battery.

A gasket for a secondary battery according to an embodiment is disposed between stack components of a secondary battery, and includes:

a flat plate-like frame body having a shape formed along an outer peripheral side sealing target portion of the cell stack member; and

a seal body which is an annular seal body, is formed of an elastic material, and is attached to a seal-side end edge portion of the frame body, and has:

and a seal projection portion which is an annular seal projection portion formed along the entire circumference of the seal-side end edge portion and is thicker than the interval between adjacent cell stack members, the seal projection portion having at least 1 annular groove portion along the entire circumference of the seal-side end edge portion.

Effects of the invention

According to the gasket for a secondary battery of the present invention, even when there is variation in the interval (interference) between the stacking of the plurality of stack members, an appropriate sealing surface can be formed, stable sealing performance can be exhibited, and expansion of the sealing width when the sealing body is compressed can be suppressed to a minimum.