JP5705569B2 - Electrochemical element and manufacturing method thereof - Google Patents

Description

  The present invention relates to an electrochemical element such as a small surface-mountable non-aqueous electrolyte battery or an electric double layer capacitor.

  Electrochemical elements such as non-aqueous electrolyte batteries and electric double layer capacitors are used for clock function backup power supplies, semiconductor memory backup power supplies, standby power supplies for electronic devices such as microcomputers and IC memories, solar watch batteries, and motor drives. It is used as a power source. In recent years, the demand for increasing the size and capacity of electrochemical devices tends to be low due to the non-volatility of semiconductor memories and the reduction in power consumption of timepiece functional devices. Rather, there is a strong demand for mounting on a substrate by downsizing, thinning, and reflow soldering. For this reason, a small and thin approximately square-shaped electrochemical element has been proposed, but an approximately rectangular-shaped electrochemical element can be crimped and crimped unlike a round-shaped electrochemical element. There wasn't. Therefore, a counter electrode made of a positive electrode and a negative electrode, a separator, and an electrolyte are housed in a substantially rectangular container, and a sealing plate is placed thereon, and seam welding is performed using a resistance welding method. When performing seam welding using this resistance welding method, the electrode active material used for the negative electrode is previously adhered to the sealing plate, the sealing plate is pushed into the container from above, and the sealing plate is pressed against the container. Welding will be performed. For this reason, there existed the adhesion | attachment work process which adhere | attaches an electrode active material to a sealing board before welding. If the adhesion between the electrode active material and the sealing plate is incomplete, the electrode active material is peeled off from the sealing plate, causing a malfunction such as an increase in internal resistance.

  In order to solve this problem, at least a part of the current collector sheet is connected to the electrode active material disposed on the opening side of the container sealed by the sealing plate, and is extended to the opening of the container. It has been proposed to perform welding by interposing an extended part of the current collector sheet (for example, Patent Document 1).

JP 2008-211094 A

  By the way, when performing seam welding using a resistance welding method, when the current collector sheet is welded through an extended portion, the extended current collector sheet protrudes outside the electrochemical element, and thereafter In the process, it was necessary to cut the protruding portion.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a highly reliable, small surface-mountable electrochemical device that can simplify the sheet cutting process. There is to do.

The present invention provides the following means in order to solve the above problems.
In invention of Claim 1, a 1st electrode, a 2nd electrode, the separator which isolate | separates said 1st electrode and a 2nd electrode, electrolyte solution, said 1st electrode, and 2nd Electricity comprising: a container for storing the electrode and the separator; a sealing plate for sealing the container; and a current collector sheet disposed between the first electrode or the second electrode and the sealing plate. A chemical element, wherein a part of the current collector sheet is welded together with the sealing plate and the container, and in the welding of the sealing plate and the container, a portion including the current collector sheet is welded by laser welding. The electrochemical element is characterized in that it is welded by resistance welding except for the portion including the current collector sheet .

According to this configuration, it is possible to perform welding with high strength in a short time, and further, it is possible to stably perform welding even in a state where an electrolytic solution is contained, thereby obtaining a highly reliable electrochemical element with stable quality. it can.

The invention according to claim 2 is the electrochemical element according to claim 1, wherein the outer periphery of the sealing plate is larger than the inner periphery of the container end and smaller than the outer periphery. did.
According to this configuration, it is easy to confirm the protruding position and amount of the protruding current collector sheet, and it is possible to weld more reliably with high strength, and to obtain a highly reliable electrochemical element with stable quality. it can.

The invention according to claim 3 is the electrochemical element according to claim 1 or 2, wherein a metal ring is formed at an end of the container, and the sealing plate and the container are provided with the metal ring. It was set as the electrochemical element characterized by being connected via.
According to this configuration, it is possible to weld more reliably with high strength, and it is possible to obtain a highly reliable electrochemical element with stable quality.

According to a fourth aspect of the present invention, there is provided an electrochemical element according to the third aspect, wherein the metal ring is formed of Kovar and is plated with nickel.
According to this configuration, the nickel plating of the metal ring can serve as a brazing material, so that it can be more reliably welded with high strength, and a highly reliable and reliable electrochemical element can be obtained. .

The invention according to claim 5 is the electrochemical element according to any one of claims 1 to 4 , wherein an end of the sealing plate is welded. It was.
According to this configuration, a highly reliable electrochemical device having stable quality can be obtained.

The invention according to claim 6 is the electrochemical element according to any one of claims 1 to 5 , wherein the current collector sheet is welded at a part of two opposing sides. Thus, an electrochemical element was obtained.
According to this configuration, since the current collector sheet is not misaligned, it can be more reliably welded with high strength, and a highly reliable electrochemical element with stable quality can be obtained.

The invention according to claim 7 is the electrochemical element according to any one of claims 1 to 6 , wherein the current collector sheet has a thickness of 5 to 10 μm. A chemical element was obtained.
According to this configuration, since poor welding does not occur, it is possible to weld more reliably with high strength, and to obtain a highly reliable electrochemical element with stable quality.

According to an eighth aspect of the present invention, the first electrode, the second electrode, the separator for separating the first electrode and the second electrode, and a storage step for storing the electrolytic solution in a container, A current collector sheet installation step in which a part of the current collector sheet protrudes from the edge of the container, and a sealing plate and the container in a state in which a part of the current collector sheet protrudes from the edge of the container a welding step of welding the bets, Ri Tona, the welding process, the current collector sheet be near the end of the sealing plate is laser welded portion located between the container and the sealing plate end step and the sealing plate of the steps of resistance welding a portion the current collector sheet is not between the container and the sealing plate ends a end portion, the electrochemical device you characterized in that it consists of It was set as the manufacturing method of this.
According to the manufacturing method of the present invention, the current collector sheet can be melted by heat during laser welding and cut together with welding. Thereby, the manufacturing process of cutting the protruding current collector sheet later could be simplified.

  The electrochemical device proposed by the present invention can melt the current collector sheet with heat during welding and cut it with welding, simplifying the manufacturing process of cutting the protruding current collector sheet later. it can. In addition, because it can be welded with high strength in a short time and can be stably welded even in the presence of an electrolyte, it has no effect on the characteristics of the electrochemical element and has a stable and reliable quality. Can be obtained.

It is sectional drawing of the electric double layer capacitor of 1st Embodiment. It is sectional drawing for demonstrating the manufacturing method of the electric double layer capacitor of 1st Embodiment. It is sectional drawing of the electric double layer capacitor of 2nd Embodiment. It is sectional drawing for demonstrating the manufacturing method of the electric double layer capacitor of 2nd Embodiment. It is sectional drawing of the electric double layer capacitor of 3rd Embodiment. It is sectional drawing for demonstrating the laser welding position of the electric double layer capacitor of this invention.

(First embodiment)
Hereinafter, a first embodiment in which the electrochemical device of the present invention is embodied in an electric double layer capacitor will be described with reference to FIGS. 1, 2, and 6.

  FIG. 1 shows a cross-sectional view of an electric double layer capacitor as a rectangular parallelepiped electrochemical element. In FIG. 1, the electric double layer capacitor has a concave container 101 opened upward, and a sealing plate 102 welded to the container 101 and sealing the opening. In the container 101 sealed by the sealing plate 102, elements including a positive electrode active material 106 as a first electrode active material, a separator 105, a negative electrode active material 107 as a second electrode active material, and the like are disposed. It has become so. The substantially square-shaped electrochemical element is effective in reducing the space occupancy in surface mounting.

  The concave container 101 was made of alumina, tungsten-printed on a green sheet, and a metal ring 109 made of Kovar (Co: 17, Ni: 29, Fe: remaining ratio alloy) was fired. Further, the connection terminal A 103 and the connection terminal B 104 were subjected to nickel and gold plating, and the upper portion of the metal ring 109 was subjected to nickel and gold plating serving as a bonding material 1081 (brazing material). The metal ring 109 was electrically connected to the connection terminal B104 by a tungsten layer passing through the left side of FIG. The metal ring 109 is formed at the end of the container 101. The metal ring is made of Kovar and is plated with nickel. According to this configuration, the nickel plating of the metal ring can serve as a brazing material, so that it can be more reliably welded with high strength, and a highly reliable and reliable electrochemical element can be obtained. .

  Although the connection terminals A103 and B104 reach the lower surface of the concave container, even if the connection terminals A103 and B104 are stopped on the side surface of the container, they can be soldered to the substrate by being wetted with the solder.

  Tungsten used for wiring as a current collector and a metal layer were provided on the entire inner bottom surface of the concave container, and penetrated through the concave container wall surface and electrically connected to the connection terminal A103. The current collector and the positive electrode active material 106 were bonded with a conductive adhesive 1111 containing carbon.

The negative electrode current collector sheet 1112 was installed so as to protrude from the two sides in the left-right direction in FIG. 2, and had a shape that did not protrude in the front-rear direction.
In the first embodiment, a negative electrode current collector sheet 1112 made of nickel and having a thickness of 5 μm was used.

  The material of the negative electrode current collector sheet 1112 can be selected from nickel, copper, aluminum, and the like. It is more preferable to select nickel that is compatible with Kovar, which is a material for the metal ring and the sealing plate, during welding.

  The thickness of the negative electrode current collector sheet 1112 is preferably 20 μm or less. A more preferable thickness is 5 to 10 μm. If the negative electrode current collector sheet 1112 is 10 μm or more, the gap between the parts without the sheet becomes large, and welding may be defective during welding. On the other hand, when the negative electrode current collector sheet 1112 is 5 μm or less, the strength is weak and handling is difficult, or when welding, it may break and lose conduction.

  The size of the sealing plate 102 was smaller than that of the metal ring 109. At least the portion where the negative electrode current collector sheet 1112 protrudes needs to be smaller than the metal ring 109. The outer periphery of the sealing plate 102 is larger than the inner periphery of the end of the container 101 and smaller than the outer periphery. According to this configuration, the protruding position and amount of the protruding negative electrode current collector sheet 1112 can be easily confirmed, welding can be performed more reliably with high strength, and a highly reliable electrochemical element with stable quality can be obtained. be able to. In addition, the container side portion of the sealing plate 102 was subjected to nickel plating serving as a bonding material 1082 (brazing material).

  The negative electrode active material 107 used was formed on a negative electrode current collector sheet 1112 made of nickel having a thickness of 5 μm. The negative electrode current collector sheet 1112 was larger than the negative electrode active material 107 and protruded outside the concave container. In FIG. 2, most of the negative electrode current collector sheet 1112 protrudes outside the concave container, but the protrusion may be part of the negative electrode current collector sheet.

  The positive and negative electrodes, the separator 105, and the electrolytic solution were accommodated in the container in the order shown in FIG.

  Next, as shown in FIG. 6, after covering with the sealing plate 102, welding of the two opposite sides of the sealing plate 102 is performed by laser welding in a state where the negative electrode current collector sheet 1112 protrudes outside the concave container. Went. By welding by laser welding, high strength welding can be performed in a short time, and a highly reliable electrochemical element with stable quality can be obtained. Further, by welding a part of the two opposing sides, it is possible to weld more reliably with high strength, and to obtain a highly reliable electrochemical element with stable quality. Laser welding aimed at the vicinity of the end of the sealing plate 102, and at the same time as welding, the negative electrode current collector sheet 1112 was melted and welded aiming at a position where it could be cut. By welding the end portion of the sealing plate 102, the negative electrode current collector sheet 1112 can be easily cut, and a highly reliable electrochemical element with stable quality can be obtained. Laser welding welds the side of the portion where the negative electrode current collector sheet 1112 protrudes to the outside of the concave container, and it may be a seam welding by a pulse or a continuous irradiation method. It is also effective for stabilizing the process to perform laser welding after spot-welding and temporarily fixing the sealing plate 102 and the concave container 101. Thereby, the edge of the negative electrode current collector sheet 1112 was welded together with the sealing plate 102 and the container 101. According to this configuration, it is possible to weld with high strength in a short time, and to obtain a highly reliable electrochemical element with stable quality. Simultaneously with the welding, the protruding portion of the negative electrode current collector sheet 1112 could be cut, and the manufacturing process of cutting the protruding negative electrode current collector sheet 1112 later could be simplified.

  The two sides where the negative electrode current collector sheet 1112 did not protrude outside the concave container were welded by a parallel seam welder (resistance welding) using the principle of resistance welding. Thereby, the sealing plate 102 and the container 101 were connected via the metal ring 109. According to this configuration, it was possible to more reliably weld with high strength, and to obtain a highly reliable electrochemical element with stable quality. Further, welding other than the portion including the negative electrode current collector sheet 1112 was welded with a parallel seam welder (resistance welding), so that stable welding was possible even in a state where the electrolyte was contained.

(Second Embodiment)
Next, a second embodiment in which the electrochemical device of the present invention is embodied as an electric double layer capacitor will be described with reference to FIGS. FIG. 3A is a cross-sectional view of the electric double layer capacitor of the second embodiment. (B) is the figure which expanded a part of (a).

  In the present embodiment, the configurations of the positive electrode active material, the separator, the negative electrode active material, and the like housed in the concave container 101 are different. Therefore, for convenience of explanation, common parts are denoted by the same reference numerals, detailed description thereof is omitted, and different points will be described in detail.

  In FIG. 3, a positive electrode active material 106, a separator 105, and a negative electrode active material 107 accommodated in a concave container 101 are foldable sheets, and the positive electrode active material 106, the separator 105, and the negative electrode active material 107 are Each is formed in a sheet shape. A sheet-like positive electrode active material 106 is laminated with a negative electrode active material 107 that is also formed into a sheet shape via a sheet-like separator 105.

  A positive electrode current collector sheet 1113 is bonded to the surface of the sheet-like positive electrode active material 106 opposite to the separator 105. The positive electrode current collector sheet 1113 is bonded to the positive electrode active material 106 and protrudes to one side in the longitudinal direction of the sheet.

  On the other hand, a negative electrode current collector sheet 1112 is bonded to the surface of the sheet-like negative electrode active material 107 opposite to the separator 105. The negative electrode current collector sheet 1112 is bonded with the negative electrode active material 107 and protrudes to one side in the longitudinal direction of the sheet.

  Thus, the layer of the sheet | seat comprised was wound so that it could be accommodated in the concave container 101. FIG. In this winding, the center portion was sandwiched so that the negative electrode current collector sheet 1112 appeared on one side and the positive electrode current collector sheet 1113 appeared on the other side, and the sheet was wound as shown in FIG.

  And the layer of the wound sheet | seat is accommodated in the concave container 101 from the side in which the positive electrode collector sheet 1113 of the cell capacitor appears. At this time, as shown in FIG. 4, the protruding portion of the positive electrode current collector sheet 1113 is bent and electrically connected to the connection terminal A103 of the concave container 101 via the conductive adhesive 1111. On the other hand, the protruding portion of the negative electrode current collector sheet 1112 facing the opening side of the concave container 101 protrudes outward from the upper position of the upper surface of the right side wall.

  From this state, after injecting the electrolytic solution into the concave container 101, the sealing plate 102 is brought into contact so as to completely close the opening of the concave container 101. At this time, the sheet layer is compressed and accommodated in the concave container 101.

  Next, after covering with the sealing plate 102, welding was performed on two sides of the sealing plate 102 facing each other with a laser welding machine in a state where the negative electrode current collector sheet 1112 protruded outside the concave container. Laser welding aimed at the vicinity of the end of the sealing plate 102, and at the same time as welding, the negative electrode current collector sheet 1112 was melted and welded aiming at a position where it could be cut. Laser welding welds the side of the portion where the negative electrode current collector sheet 1112 protrudes to the outside of the concave container, and it may be a seam welding by a pulse or a continuous irradiation method. Thereby, the edge of the negative electrode current collector sheet 1112 was welded together with the sealing plate 102 and the container 101. According to this configuration, it is possible to weld with high strength in a short time, and to obtain a highly reliable electrochemical element with stable quality. Simultaneously with the welding, the protruding portion of the negative electrode current collector sheet 1112 could be cut, and the manufacturing process of cutting the protruding negative electrode current collector sheet 1112 later could be simplified.

  The two sides where the negative electrode current collector sheet 1112 did not protrude outside the concave container were welded by a parallel seam welding machine using the principle of resistance welding. Thereby, it was possible to perform stable welding even in a state where the electrolytic solution was contained.

(Third embodiment)
Next, a third embodiment in which the electrochemical device of the present invention is embodied as an electric double layer capacitor will be described with reference to FIG. FIG. 5 is a cross-sectional view of the electric double layer capacitor of the third embodiment. In the second embodiment, the sheet layer is rolled and accommodated in the concave container 101. In the third embodiment, the sheet layer is folded and accommodated in the concave container 101 as shown in FIG. After that, as in the second embodiment, the side of the portion where the negative electrode current collector sheet 1112 protruded outside the concave container was welded by laser welding. Thereby, the edge of the negative electrode current collector sheet 1112 was welded together with the sealing plate 102 and the container 101. According to this configuration, it is possible to weld with high strength in a short time, and to obtain a highly reliable electrochemical element with stable quality. Simultaneously with the welding, the protruding portion of the negative electrode current collector sheet 1112 could be cut, and the manufacturing process of cutting the protruding negative electrode current collector sheet 1112 later could be simplified.

  The two sides where the negative electrode current collector sheet 1112 did not protrude outside the concave container were welded by a parallel seam welding machine using the principle of resistance welding. Thereby, it was possible to perform stable welding even in a state where the electrolytic solution was contained.

  The thickness of the negative electrode current collector sheet 1112 is preferably 20 μm or less. A more preferable thickness is 5 to 10 μm. If the negative electrode current collector sheet 1112 is 10 μm or more, the gap between the parts without the sheet becomes large, and welding may be defective during welding. On the other hand, when the negative electrode current collector sheet 1112 is 5 μm or less, the strength is weak and handling is difficult, or when welding, it may break and lose conduction.

  The material of the negative electrode current collector sheet 1112 can be selected from nickel, copper, aluminum, and the like. It is more preferable to select nickel that is compatible with Kovar, which is a material for the metal ring and the sealing plate, during welding.

  As the material of the positive electrode current collector sheet 1113, aluminum, titanium, or the like can be selected. It is more preferable from the viewpoint of cost to select relatively inexpensive aluminum.

  The concave container 101 is preferably a heat resistant material such as a heat resistant resin, glass, ceramics or ceramic glass. As a manufacturing method, it is also possible to wire by low-melting glass or glass ceramics by conductor printing, and to laminate and fire at a low temperature. It is also possible to laminate by alumina printing and conductor printing and to fire.

The metal ring 109 is preferably made of a material having a thermal expansion coefficient close to that of the concave container 101.
For example, when the concave container 101 uses alumina having a thermal expansion coefficient of 6.8 × 10 −6 / ° C., it is desirable to use Kovar having a thermal expansion coefficient of 5.2 × 10 −6 / ° C. as the metal ring.

  Further, it is desirable to use the same Kovar as the metal ring in order to increase the reliability after welding for the sealing plate 102. This is because after the welding, when it is surface-mounted on the substrate of the equipment, that is, when reflow soldering, it is heated again.

  Further, the portion of the wiring that becomes the current collector is preferably tungsten, palladium, silver, platinum, or gold, which has good corrosion resistance and can be formed by a thick film method. Aluminum and carbon can also be used. In the case where the wiring on the bottom surface of the concave container 101 is used as the current collector on the positive electrode side, gold or tungsten is particularly preferable. This is because a material having a high withstand voltage is used so that it does not dissolve when a positive potential is applied.

  Furthermore, in order to improve the electrical connection between the electrode and the wiring, it is effective to use a conductive adhesive containing carbon. When a material with a low withstand voltage is used, it is effective to apply a conductive adhesive containing carbon to the metal of the current collector alone and bake and harden it. When aluminum is used, dry film formation such as vapor deposition or sputtering can be used.

  The connection terminals A103 and B104 are preferably provided with nickel, gold, tin, and solder layers for soldering to the base. It is preferable to provide a layer of nickel, gold, or the like that is compatible with the bonding material at the edge of the concave container 101. Examples of the layer forming method include vapor phase methods such as plating and vapor deposition.

  It is effective to provide a layer of nickel and / or gold as a brazing material on the surfaces where the metal ring 109 and the sealing plate 102 are joined. This is because the melting point of gold is 1063 ° C. and the melting point of nickel is 1453 ° C., but the melting point can be lowered to 1000 ° C. or less by using an alloy of gold and nickel. Examples of the layer forming method include a vapor phase method such as plating and vapor deposition, and a thick film method using printing. In particular, a thick film method using plating and printing is advantageous in terms of cost.

  However, impurity elements such as P, B, S, N, and C in the brazing material layer need to be 10% or less. Care must be taken especially when plating is used. For example, in electroless plating, P is likely to enter from the reducing agent sodium hypophosphite and B from dimethylamine borane. Also, in electroplating, care must be taken because it may enter from brightener additives and anions. It is necessary to adjust the amount of reducing agent, additive, etc. to 10% or less. If it enters 10% or more, an intermetallic compound is formed on the joint surface and cracks are generated.

  When nickel is used for the bonding material 1082 on the sealing plate 102 side, gold is preferably used for the bonding material 1081 on the concave container 101 side. The ratio of gold to nickel is preferably between 1: 2 and 1: 1, and the melting point of the alloy is lowered, so that the welding temperature is lowered and the bondability is improved.

  Laser welding may be pulsed seam welding or continuous irradiation. In the seam welding by pulse, the laser is irradiated in a pulse shape, so that it becomes a seam shape after welding. If the pulse width is not controlled so that individual weld marks by the pulses overlap, complete sealing cannot be achieved.

  In the seam welding using the resistance welding method, welding is performed according to the principle of resistance welding by pressing a roller-type electrode facing two opposite sides of the sealing plate 102 and passing an electric current. Since the current flows in a pulsed manner while rotating the roller electrode, it becomes a seam shape after welding. If the pulse width is not controlled so that individual weld marks by the pulses overlap, complete sealing cannot be achieved.

  The separator to be used is preferably a heat-resistant nonwoven fabric. For example, a roll-rolled separator such as a porous film has heat resistance but shrinks in the rolling direction due to heat during seam welding using a resistance welding method. As a result, internal short circuit is likely to occur. In the case of a separator using a heat-resistant resin or glass fiber, it was good with little shrinkage. As the resin, PPS (polyphenylene sulfide) and PEEK (polyether ether ketone) were good. In particular, glass fiber was effective. A ceramic porous body can also be used.

Although the shape of the electrochemical element of the present invention is basically free, the substantially square shape is advantageous in efficiently disposing on the substrate because there is no protrusion such as a terminal.
The electrochemical element of the present invention has been described by taking an electric double layer capacitor as an example, but it goes without saying that the electrochemical element can be applied to a non-aqueous electrolyte secondary battery or the like.

101 Concave Container 102 Sealing Plate 103 Connection Terminal A
104 Connection terminal B
105 Separator 106 Positive Electrode Active Material 107 Negative Electrode Active Material 1081 Bonding Material 1082 Bonding Material 109 Metal Ring 1111 Conductive Adhesive 1112 Negative Electrode Current Collector Sheet 301 Laser Light 302 Laser Light Source

Claims (8)

A first electrode, a second electrode, a separator for separating the first electrode and the second electrode, an electrolytic solution, the first electrode, the second electrode, and the separator are accommodated. An electrochemical device comprising: a container to be sealed; a sealing plate for sealing the container; and a current collector sheet disposed between the first electrode or the second electrode and the sealing plate,
A part of the current collector sheet is welded together with the sealing plate and the container ,
In the welding of the sealing plate and the container, the portion including the current collector sheet is welded by laser welding, and the portion other than the portion including the current collector sheet is welded by resistance welding. element.   The electrochemical device according to claim 1, wherein an outer periphery of the sealing plate is larger than an inner periphery of the container end and smaller than an outer periphery.   The electrochemical element according to claim 1, wherein a metal ring is formed at an end of the container, and the sealing plate and the container are connected via the metal ring.   The electrochemical device according to claim 3, wherein the metal ring is made of Kovar and is plated with nickel. The electrochemical element according to any one of claims 1 to 4 , wherein an end portion of the sealing plate is welded. The electrochemical device according to any one of claims 1 to 5 , wherein a part of two opposing sides of the current collector sheet is welded. The electrochemical device according to any one of claims 1 to 6, wherein the thickness of the current collector sheet is 5 to 10 [mu] m. A housing step of housing the first electrode, the second electrode, the separator separating the first electrode and the second electrode, and the electrolytic solution in a container;
A current collector sheet installation step of installing a part of the current collector sheet protruding from the edge of the container; and
A welding step of welding the sealing plate and the container with a part of the current collector sheet protruding from the edge of the container;
Tona is,
The welding process includes
Laser welding the vicinity of the end portion of the sealing plate and the current collector sheet between the end portion of the sealing plate and the container;
A step of resistance welding a portion near the end of the sealing plate and the current collector sheet is not between the end of the sealing plate and the container;
Method for producing an electrochemical element you characterized in that it consists of.

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