JP4918996B2 - Battery case lid - Google Patents

Description

  The present invention relates to a battery case lid, and more particularly to a battery case lid in a rectangular battery.

As shown in FIG. 5, an electric double layer capacitor having a pair of electrode terminals 912 and 913 connected to each electrode (not shown) as well as closing the opening of the bottomed cylindrical case 92 as shown in FIG. In the lid body 91, a hollow cylindrical first electrode terminal 912 disposed on the outer peripheral side of the opening and a second electrode terminal 912 disposed on the inner peripheral side of the electrode terminal 912 with a predetermined interval. An electrode terminal 913, and an insulating sealing member 914 made of a resin molded body including a small piece of glass fiber insert-molded between the electrode terminals 912 and 913, and formed on the surfaces of the electrode terminals 912 and 913. A configuration characterized by being chemically bonded to an organic compound layer chemically bonded to electrode terminals 912 and 913 is disclosed (Patent Document 1).
JP 2002-237436 A

  However, in the lid disclosed in Patent Document 1, since the electrode terminal and the resin are firmly bonded via the organic compound layer, the insulating sealing member made of resin formed by insert molding or the like is cooled and solidified. There is a problem that warpage deformation of the lid body occurs due to the shrinkage at the time of welding, and a defect occurs in welding between the lid body and the case. In particular, when the shape of the lid is a square shape, since the bending strength of the lid is low, there is a problem that the amount of warp deformation of the lid further increases. In addition, even if warping deformation does not occur, a large stress is applied to the lid, and there is a possibility that an effect such as a decrease in sealing performance after long-term use may occur.

  The present invention has been completed in view of the above circumstances, and it is a problem to be solved to provide a battery case lid that can prevent the occurrence of warping deformation by reducing internal stress caused by thermal contraction of resin. And

The lid of the battery case of the present invention is a lid of a battery case that closes the opening of the battery case main body part in which the electrode body having the positive and negative electrodes and the electrolyte are partially opened, and
A main body having an outer shape generally corresponding to the opening, and formed of a metal plate;
A set of electrode terminals connected to the positive and negative electrodes of the electrode body;
An insulating sealing member that joins between the body portion and the electrode terminal by filling between the body portion and the electrode terminal and insulates between the pair of electrode terminals;
It said set of electrode terminals or the portion where the main body portion is bonded to said insulating sealing member, and the insulating sealing member, the organic compound layer together forming the both the said pair of electrode terminals or the body portion It has something.

  And the battery case cover of the present invention that solves the above problems is characterized in that: (a) the insulating sealing member is divided into a plurality of parts in the spreading direction of the main body, or (b ) The insulating sealing member is bonded to each of the front and back surfaces of the main body, and the shape of the bonding surface bonded to the front side of the main body and the shape of the bonding surface bonded to the back of the main body Are substantially the same shape.

  That is, if the area of the joint portion between the insulating sealing member and the main body portion is large (long), the influence on the main body portion due to the shrinkage of the resin forming the insulating sealing member becomes large. Further, the stress is reduced by dividing the insulating sealing member into a plurality of parts in the extending direction of the main body. That is, by dividing the insulating sealing member into a plurality of parts, the absolute value of the contraction amount in each of the divided insulating sealing members is reduced, and the stress applied to the main body is also reduced. In addition, as shown in (b), by forming the insulating sealing member so as to have the same shape on the front and back surfaces of the main body, the stress applied to the front and rear surfaces of the main body due to the shrinkage of the insulating sealing member becomes approximately the same. Generation of distortion in the main body is suppressed. Here, it is also possible to realize a battery case lid in which both configurations (a) and (b) are combined.

  For the purpose of improving the bending strength, the main body part preferably has reinforcing ribs disposed on the outer peripheral part.

Here, non-reinforced PPS or PP can be adopted as the insulating sealing member. As examples of the organic compound layer you adopt triazin dithiol polymerized film.

  Such distortion of the lid is remarkable when the shape of the opening is an elongated shape, and it is desirable to apply to such a lid.

  The lid of the battery case according to the present invention has the above-described configuration, and exhibits the following effects. That is, the lid of the battery case of the present invention can reduce the distortion generated by the shrinkage that occurs when the insulating sealing member is formed.

  The lid of the battery case of the present invention will be described in detail based on the following embodiments. The lid of the battery case of this embodiment is a member that closes the opening of the battery case main body. The battery case is a member that accommodates an electrode body and an electrolyte therein, and includes a battery case main body part that is partially opened to accommodate the electrode body and electrolyte, and a lid body that closes the opening part. The opening of the battery case body needs to be closed when the battery is used, but especially when the battery is a non-aqueous battery, it is required to improve the hermeticity in order to prevent moisture from entering. It is desirable to employ the battery case lid of the embodiment. The battery case body is preferably formed from metal.

  The lid of the battery case of the present embodiment has a main body portion and electrode terminals. An insulating sealing member is filled between the main body portion and the electrode terminal. The main body is formed from a metal plate. The shape of the main body has an outer shape that substantially corresponds to the opening of the battery case main body. After the main body is fitted into the opening, it can be joined by welding or the like. Like a prismatic battery, when the shape of the opening of the battery case main body is an elongated shape, there is a high risk of the cover body being distorted, so the effect of applying the battery case cover body of this embodiment is high.

  It is desirable that the main body portion is formed with ribs. The rib is preferably formed on the outer peripheral portion of the main body. The ribs on the outer peripheral portion can be easily formed by bending the outer peripheral portion of the main body by a method such as press working.

  The electrode terminal is connected to the positive and negative electrodes of the electrode body housed in the battery case, and includes one set of a positive electrode terminal connected to the positive electrode and a negative electrode terminal connected to the negative electrode. It is a member. Here, one of the positive electrode side and the negative electrode side can be shared by the aforementioned main body.

  The insulating sealing member is filled and formed between the main body portion and the electrode terminal. The insulating sealing member is a member that seals the inside of the battery case by insulating between a pair of electrode terminals and closely contacting the electrode terminals and the main body. The insulating sealing member can be formed by insert molding in a state where the main body portion and the electrode terminal are held at predetermined positions.

An organic compound layer is formed between the main body or electrode terminal and the insulating sealing member. The organic compound layer includes a main body portion or the electrode terminals, are engaged binding between both bonded is part of the insulating sealing member.

The organic compound layer is a triazine dithiol polymerized film.

Formation of the triazine thiol polymerized film on the surface of the main body and the electrode terminal can be performed by electrodeposition. Specifically, an aqueous solution of the triazine thio Lumpur on which the electrodeposition solution, the anode members forming the organic compound layer of the main body and the electrode terminals, platinum plate, titanium plate, cathode carbon plate or the like The electrodeposition process is performed at a low temperature by passing a current between the two electrodes.

The body portion and the electrode terminals can be used to produce a covalent bond with preparative rear Jin thiol polymerized film, aluminum, aluminum alloy, copper, stainless steel, iron, nickel, titanium, tantalum or the like. In particular, it is desirable to use aluminum or an aluminum alloy because of its excellent affinity with the triazine thiol polymerized film .

Insulating sealing members include polyolefins such as polypropylene (PP), nylon, acrylonitrile-butadiene-styrene copolymer resin (ABS), and polybutylene terephthalate (PBT) to form a covalent bond with the triazine thiol polymerized film. Polyphenylene sulfide (PPS), polyphenylene oxide (PPO), epoxy resin, phenol resin, and the like can be used. In particular, PPS and PP can be preferably used because of excellent bondability with the organic compound layer. Furthermore, it is desirable to employ a non-reinforced resin not containing a filler (for example, non-reinforced PPS or non-reinforced PP). This is because the filler formed from glass or the like may react with the electrolyte.

(First embodiment)
The insulating sealing member in this embodiment is divided into a plurality of parts in the spreading direction of the main body. Here, since the area of the portion joined between the insulating sealing member and the main body is reduced by being divided into a plurality of parts, even if the same degree of contraction occurs in each part, it occurs in each part. The absolute value of stress is reduced.

  As an example of dividing the insulating sealing member, when there are two electrode terminals, it can be filled (divided into two) between the electrode terminal and the main body at the periphery of each electrode terminal. Furthermore, when a safety valve or the like is formed on the lid, an insulating sealing member can be formed independently around the safety valve. Thus, when filling the insulating sealing member, the value of the stress generated by the minimum size can be reduced.

(Second Embodiment)
The insulating sealing member in this embodiment is joined to each of the front and back surfaces of the main body. And the shape of the joint surface joined to the front side of a main-body part and the shape of the joint surface joined to the back surface of a main-body part are made into the substantially same shape. By making the shape of the joint surface on the front and back surfaces of the main body portion substantially the same, the stress on the front surface and the stress on the back surface are balanced, and the influence on the main body portion can be reduced.

  Hereinafter, the lid of the battery case of the present invention will be described in detail based on examples. As shown in FIGS. 1 and 2, the battery case lid 1 of the present embodiment includes a main body 11, an electrode terminal (positive electrode terminal) 12, an electrode terminal (negative electrode terminal) 13, and insulating sealing members 141 and 142. Have. The lid 1 of the battery case is fitted into the opening of the battery case main body 2 and joined (for example, joined by welding) to form a sealed battery case. The electrode terminals 12 and 13 are electrically connected to positive and negative electrodes of an electrode body (not shown).

  The main body 11 is made of an aluminum plate and has through holes 11a and 11b through which the electrode terminals 12 and 13 pass. The electrode terminals 12 and 13 are disposed in the through holes 11 a and 11 b so as not to contact the main body 11. Insulating sealing members 141 and 142 made of PP or PPS are filled / formed between the body 11 and the electrode terminals 12 and 13 for the purpose of maintaining the positional relationship and sealing / joining the two. Has been.

  The surface of the main body 11 and the electrode terminals 12 and 13 has an organic compound layer composed of triazinedithiol. This organic compound layer is a triazine dithiol polymerized film. Specifically, the main body part 11 and the electrode terminals 12 and 13 are immersed in a triazine dithiol aqueous solution as a cathode, and a triazine dithiol polymerized film is formed by flowing an electric current using platinum or the like as an anode.

  The insulating sealing members 141 and 142 are formed by performing insert molding in a state where the main body 11 and the electrode terminals 12 and 13 are arranged at predetermined positions. By performing insert molding, a reaction that forms a covalent bond with the organic compound layer formed on the surface of the main body 11 and the electrode terminals 12 and 13 proceeds, and the insulating sealing members 141 and 142 11 and the electrode terminals 12 and 13 are firmly joined.

  Here, as is apparent from the cross-sectional view shown in FIG. 2, the shape of the insulating sealing members 141 and 142 is the spreading direction of the main body 11 (the left and right directions in FIG. 2 and the electrode terminals 12 and 13 are arranged side by side. In the direction). Further, the insulating sealing members 141 and 142 are formed so that the front and back surfaces of the main body 11 have joint surfaces having substantially the same shape.

  By adopting the shapes as described above as the shapes of the insulating sealing members 141 and 142, the stress applied to the main body portion 11 after insert molding is reduced. That is, by dividing the insulating sealing member into two parts and reducing the size of the main body portion 11 in the spreading direction, the stress applied to the joint surface in each of the insulating sealing members 141 and 142 is reduced. Moreover, by making the joint surface the same shape on the front and back surfaces, the stress cancels out on the front and back surfaces, and the stress in the direction of bending the main body 11 can be reduced.

  3 and 4 show other battery case lids. The battery case lid 91 ′ shown in FIG. 3 is integrated with the insulating sealing member 143 not being divided. Therefore, the stress due to the shrinkage after the insert molding increases according to the length of the joint surface, and a larger stress is applied to the main body 11 than the battery case cover 1 shown in FIGS. 1 and 2. However, since the shapes of the surfaces to which the insulating sealing member 143 is joined are the same on the front and back surfaces, the stress balance on the front and back surfaces is improved, and the stress in the bending direction can be reduced.

  The battery case lid 91 ″ shown in FIG. 4 is not divided into the insulating sealing member 144, and a large stress is applied unlike the battery case lid 91 ′ shown in FIG. The shape (area) of the joining surface to which 144 is joined is different, and the balance between the front and back surfaces is poor. In the battery case lid 91 ″ shown in FIG. Therefore, a large stress in the shrinking direction is applied to the surface side, and distortion occurs in a direction in which the surface side becomes concave.

It is an external view of the battery provided with the cover of the battery case of a present Example. It is sectional drawing of the battery provided with the cover body of the battery case of a present Example. It is sectional drawing of the battery provided with the cover body of the battery case of another Example. It is sectional drawing of the battery provided with the cover body of the battery case of a comparative example. It is sectional drawing of the battery provided with the cover body of the battery case of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 91, 91 ', 91 "... Lid of battery case 11 ... Main-body part 11a, 11b ... Through-hole 12, 13, 912, 913 ... Electrode 141, 142, 143, 144, 914 ... Insulation sealing member 2 ... Battery Case body

Claims (5)

An electrode body having positive and negative electrodes and a battery case lid for closing the opening of the battery case main body part in which the electrolyte is accommodated.
A main body having an outer shape generally corresponding to the opening, and formed of a metal plate;
A set of electrode terminals connected to the positive and negative electrodes of the electrode body;
An insulating sealing member that joins between the body portion and the electrode terminal by filling between the body portion and the electrode terminal and insulates between the pair of electrode terminals;
The portion where the one set of electrode terminals or the main body is joined to the insulating sealing member is covalently coupled to both the insulating sealing member and the one set of electrode terminals or the main body. Has an organic compound layer,
The insulating sealing member is divided into a plurality in the spreading direction of the main body ,
Lid of the battery case, wherein the organic compound layer has a triazine dithiol polymerized film der Rukoto. An electrode body having positive and negative electrodes and a battery case lid for closing the opening of the battery case main body part in which the electrolyte is accommodated.
A main body having an outer shape generally corresponding to the opening, and formed of a metal plate;
A set of electrode terminals connected to the positive and negative electrodes of the electrode body;
An insulating sealing member that joins between the body portion and the electrode terminal by filling between the body portion and the electrode terminal and insulates between the pair of electrode terminals;
The portion where the one set of electrode terminals or the main body is joined to the insulating sealing member is covalently coupled to both the insulating sealing member and the one set of electrode terminals or the main body. Has an organic compound layer,
The insulating sealing member is bonded to each of the front and back surfaces of the main body, and the shape of the bonding surface bonded to the front side of the main body and the shape of the bonding surface bonded to the back of the main body are generally Ri same shape der,
Lid of the battery case, wherein the organic compound layer has a triazine dithiol polymerized film der Rukoto.   The battery body lid according to claim 1, wherein the main body has a reinforcing rib disposed on an outer peripheral portion.   The battery case lid according to claim 1, wherein the insulating sealing member is non-reinforced PPS or PP. The lid of the battery case according to any one of claims 1 to 4 , wherein the shape of the opening is an elongated shape.

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