JP2017224494A - Manufacturing method of tab lead and manufacturing method of battery with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of efficiently manufacturing an irregular-shaped tab lead at low cost, in which a connection terminal side is projected to a width direction outer side of an exterior member.SOLUTION: A manufacturing method is for a tab lead 10 which is connected to a collector, and in which a connection terminal 13 is projected. In a place that is formed that one end part 11 is continued to an end side and a pair of sides continued to the end side, and is held by a battery outer casing member 2 of the one end part 11, a sealant film 3 is adhered. On the other hand, the connection terminal part 13 of the other end part has a different form that is projected and provided to at least one of a direction crossing to the side. The manufacturing method includes a first punching step of punching a place to which at least sealant film 3 in the end side and the pair of sides is adhered from a long-sized base material, and not punching the circumference of the connection terminal part 13 of the other end part; a step of pre-processing a punching processing material; a step of adhering the sealant film 3 at a predetermined position of the pre-processing material; and a second punching step of punching a sealant film adhesion member to an individual tab lead 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a tab lead suitable for use in a laminate type battery in which a power generation element and a part of a tab lead connected thereto are covered with a battery exterior member, and a method of manufacturing a battery using the same.

  As a laminate type battery, a lithium ion battery using a lithium metal oxide as a positive electrode active material is widely used. Such a battery is configured by housing a power generation element made of a laminate of a positive electrode having a positive electrode active material layer, a separator, and a negative electrode having a negative electrode active material layer in an exterior member made of a laminate film, and filling an electrolyte. . A laminate-type battery is characterized by being lightweight, thin and flexible. In such a laminate-type battery, a tab lead serving as an electrode terminal for connection has a current collector formed by bundling one end side of the positive electrode constituting the laminated body and a current collector obtained by bundling one end side of the negative electrode constituting the laminated body. It is provided so as to protrude outward from the exterior member while being connected to the electric body.

  Such a tab lead is generally formed by punching a long roll-shaped metal plate, and the tab lead material is generally aluminum for the positive electrode, copper or the like for the negative electrode. Nickel is used.

  In general, the tab lead for the positive electrode is subjected to a pre-processing step for attaching a sealant film to a long base material wound in a roll shape to both end surfaces of the long base material, so that a predetermined position is obtained. It is manufactured by sticking a sealant film so as to straddle a long base material and then cutting it to a predetermined length.

  On the other hand, the negative electrode tab lead is subjected to nickel plating or the like in the case of copper, and in the case of nickel without the nickel plating step, like the positive electrode tab lead, the pretreatment step, the sealant film attaching step, cutting It is manufactured through a process. The produced positive electrode tab lead and negative electrode tab lead are connected to the positive electrode current collector and the negative electrode current collector, respectively, and the power generation element including the connecting portion is covered with the exterior member, and the power generation element covered with the exterior member A battery of the laminate type is obtained by filling the periphery with an electrolyte and sealing. Laminate type batteries are battery packs that are connected in series or in parallel with each other by connecting the tab lead's protruding part from the exterior member to the tab lead of another laminate type battery via a lead wire or the like. Configure.

  However, in order to save space as an assembled battery and easily connect the tab leads of a plurality of batteries without using lead wires or the like, it is not a rectangular tab lead just protruding from the opening of the battery exterior member. There is a need for a modified tab lead having a protruding portion that protrudes outward in the width direction of the exterior member after protruding from the opening.

  However, in the above-described deformed tab lead, the end face where the sealant film is applied needs to be plated in the case of the above-described pretreatment or in the case of the tab lead for the negative electrode. Need to punch. Therefore, processing must be performed for each single product, and there is a problem that the manufacturing cost is very high.

  Here, a manufacturing method of a battery tab has been proposed in which a punching process is performed in a state where a connection part is left in a part to obtain a long hoop material, and then surface treatment is continuously performed (see Patent Document 1). ).

JP 2009-87751 A

  However, in the manufacturing method of Patent Document 1, since only a part of the connection portion between the battery tab and the hoop material is present, the state of the battery tab becomes unstable, and the treatment such as surface treatment is performed on the battery tab and the hoop. When the material is connected with the connection part, the battery tab should be kept in a stable state so that twisting does not occur at the connection part so that the necessary processing is performed on each battery tab. It is necessary to devise an arrangement.

  In Patent Document 1, a tab film 7 is used. In the manufacturing method of Patent Document 1, when the tab film 7 is attached in a state where the battery tab and the hoop material are connected by the connecting portion, the connecting portion between the battery tab and the hoop material is a part of the battery tab. When stress is applied to the connection portion between the hoop material and the hoop material, bending, twisting, and cutting of the connection portion occur, and the subsequent process is affected.

  In view of such circumstances, the present invention provides a tab lead manufacturing method and a battery manufacturing method using the tab lead that can efficiently and inexpensively manufacture an irregular shaped tab lead whose connecting terminal protrudes outward in the width direction of the exterior member. For the purpose.

  According to a first aspect of the present invention for solving the above-described problem, one end is covered with a battery exterior member, connected to a current collector of a power generation element, and a connection terminal portion on the other end is connected to the outside from the battery exterior member. A method of manufacturing a tab lead that is sandwiched and fixed by the battery exterior member in a protruding state, wherein the tab lead is formed of an end side and a pair of side sides that are continuous with the end side, and A sealant film is affixed to a portion of the one end portion that is sandwiched between the battery exterior members, and the connection terminal portion of the other end portion is provided so as to protrude in at least one of the directions intersecting the side. Punched from the long base material to at least the location where the sealant film is pasted on the end side and the pair of side sides, and the periphery of the connection terminal portion at the other end is punched out. Not the first stamping A pretreatment step for performing a pretreatment for applying the sealant film to the punched material on which the first punching step has been performed, and a predetermined pretreatment material on which the pretreatment step has been performed. A method of manufacturing a tab lead, comprising: a sticking step of sticking the sealant film at a position; and a second punching step of punching into individual tab leads from the sealant film sticking material on which the sticking step has been performed. is there.

  In this aspect, since the process up to the step of applying the sealant film can be performed by continuous processing, the efficiency of the manufacturing process can be improved, and a low-cost tab lead can be provided.

  According to a second aspect of the present invention, the long base material is wound in a roll shape, and at least after the pretreatment step, the long base material is cut into a long piece including a plurality of the tab leads. The sealant film is affixed to each scale piece.

  In this aspect, even if the long base material is thick, continuous processing can be performed for each long piece having a predetermined length, and efficiency and cost can be reduced.

  According to a third aspect of the present invention, the long base material is cut into long pieces including a plurality of tab leads before the pretreatment step, and the pretreatment step is performed for each long piece. Features.

  In this aspect, even when plating is performed, the processing after plating can be performed for each long piece having a predetermined length, and efficiency and cost can be reduced.

  According to a fourth aspect of the present invention, the side of the one end of the tab lead is disposed along the longitudinal direction of the long base material, and the end of the one end is fed in the pasting step. The sealant film is continuously pasted while feeding the long base material from the upstream side to the downstream side so as to be on the upstream side in the direction.

  In this aspect, since there is no punching portion on the downstream side in the feed direction and there is a punching portion only on the upstream side, it is possible to perform continuous processing similar to the straight type without the punching portion.

  A fifth aspect of the present invention is characterized in that at least one of the pretreatment step and the pasting step is a multi-row treatment performed in parallel by providing a plurality of lines in the same facility.

  In this aspect, the pre-processing process and the pasting process, which are time-consuming processes compared to other processes, are provided in parallel so that they can be processed in parallel. Can be done automatically.

  According to a sixth aspect of the present invention, there is provided a step of connecting the one end of the tab lead to the current collector using the tab lead manufactured by the tab lead manufacturing method according to any one of the above aspects, the current collector and the A step of covering the connecting portion of the tab lead with the one end portion with the exterior member; and a step of sealing the opening of the exterior member with the other end portion protruding from the exterior member. And a battery manufacturing method.

  In such a mode, a battery having an irregularly shaped tab lead whose connecting terminal side protrudes outward in the width direction of the exterior member can be manufactured with high efficiency and low cost.

It is a figure which shows schematic structure of the battery manufactured by one Embodiment. It is a figure which shows schematic structure of the tab lead manufactured by one Embodiment. It is a figure which shows the manufacturing process of the tab lead of one Embodiment. It is a figure which shows the manufacturing process of the tab lead of one Embodiment. It is a figure which shows the manufacturing process of the tab lead of one Embodiment. It is a figure which shows the manufacturing process of the tab lead of other embodiment. It is a figure which shows the manufacturing process of the tab lead of other embodiment. It is a figure which shows the manufacturing process of the tab lead of other embodiment.

  A schematic configuration of a battery and a tab lead manufactured in one embodiment is shown in FIGS. In this embodiment, the lithium ion battery 1 which is a secondary battery using a lithium metal participant as a positive electrode active material is taken as an example.

  The lithium ion battery 1 is a laminate type battery in which a power generation element 3 is enclosed inside an exterior member 2. In the present embodiment, the exterior member 2 is made of a laminate material that seals the openings on the upper and lower sides in the figure, and a part of the pair of tab leads 10 connected to the power generation element 3 covered with the exterior member 2 is the opening. It protrudes from. One of the tab leads 10 (referred to as 10A) is a positive tab lead, and the other (referred to as 10B) is a negative tab lead.

  Note that the insides of the exterior members 2 of the two tab leads 10 shown in FIG. 1 are connected to the positive-side current collector and the negative-side current collector at the respective end portions of the power generation element 3.

  As shown in detail in FIG. 2, the tab lead 10 has one end portion 11 inserted into the exterior member 2 having a straight shape, and has an end side 11 a and a pair of side sides 11 b continuous to the end side 11 a. On the other hand, the other end portion 12 projecting out of the exterior member 2 has a shape in which the connection terminal portion 13 projects outward in the width direction of the exterior member 2. Such a tab lead 10 has a different shape that is not straight as a whole, that is, an L-shape.

  A sealant film 15 is attached to the other end 12 side of the one end 11. The sealant film 15 is provided at a location that is sandwiched by the opening of the exterior member 2, and is for ensuring a sealing property with the exterior member 2.

  The sealant film 15 is thermocompression bonded to a predetermined position of the tab lead 10 at a temperature of about 140 ° C. to 220 ° C. Further, the exterior member 2 is thermocompression-bonded with the sealant film 15 provided on the tab lead 10 sandwiched at the seal portion, whereby the opening of the exterior member 2 is sealed. In this way, the lithium ion battery 1 is manufactured.

  As shown in FIG. 1, the tab lead 10 of the lithium ion battery 1 has an irregularly shaped tab lead having an L shape instead of a rectangular shape. By applying such a tab lead 10, for example, even when the tab lead 10 is bent to the exterior member 2 side, the connection terminal portion 13 that is a part of the tab lead 10 protrudes to the outside (side) of the exterior member 2. Therefore, it becomes easy to connect to a plurality of lithium ion batteries 1 having the same configuration. Therefore, in the lithium ion battery 1 to which the irregularly shaped tab lead 10 is applied, the tab leads 10 of the plurality of lithium ion batteries 1 can be easily connected in series or in parallel.

  Next, an example of a method for manufacturing such a tab lead 10 will be described with reference to FIGS.

The tab lead 10 is manufactured by punching from a long base material such as an aluminum material or a copper material or a nickel material wound in a roll shape. The tab lead 10A for the positive electrode is made of an aluminum material as a long base material, and in order to attach the sealant film 15, it is necessary to perform a pretreatment including the end faces on both sides in the width direction of the application location, that is, a surface treatment such as a chemical conversion treatment. is there. Further, the negative electrode tab lead 10 </ b> B needs to be plated first, including the end surfaces on both sides in the width direction where the sealant film 15 is pasted, when the copper material is a long base material. There is. The negative electrode tab lead 10 </ b> B does not need to be plated when a nickel material is a long base material.
Therefore, it manufactures as follows.

  First, as shown in FIG. 3, a first punching process for punching the boundary between the end 11a and the side 11b of the one end 11 of the tab lead 10 is performed. Thereby, the punching portion 21 is formed around the end side 11a and the side side 11b of the one end portion 11. Other parts are not punched at this stage. This makes it possible to reduce the number of first punched portions as much as possible, facilitate the handling of the object to be processed in the subsequent continuous processing in the manufacture of the tab lead, and perform the manufacturing efficiently.

  Here, the punched portion 21 does not need to be formed on the entire side 11b, and may be formed from the end 11a to at least a place where the sealant film 15 is pasted. Thereby, about the location inserted in the exterior member 2, since it is stamped by the 1st punching process and the connection terminal part 13 side extended from the exterior member 2 is not punched, it is connected to the connection terminal part 13 side. Until the punching is performed, the tab lead 10 can be maintained in a stable state at the portion on the connection terminal portion 13 side, and it is easy to handle a workpiece such as a long base material after punching. Cutting powder or the like due to an alignment error or the like is not formed, and it is possible to eliminate the cause of battery failure.

  Thus, after performing the 1st punching process, in the case of the negative electrode using a copper material, nickel plating is given. Thereafter, in the case of the negative electrode, a pretreatment, that is, a surface treatment is further performed regardless of the copper material or the nickel material.

  Here, the first punching step and the plating treatment may be performed continuously while feeding the long base material from the roll, and further, the surface treatment may be performed continuously.

  Further, after the first punching step and the plating step (the plating step is for a copper negative electrode), a roll shape may be formed, and then a separate surface treatment may be performed.

  In addition, when winding up to a roll, you may pinch | interpose an interleaf.

  Moreover, it is good also as a long piece cut | judged by predetermined length instead of winding up to a roll after each process.

  Furthermore, the plating treatment and the surface treatment may be a multi-strip treatment performed in parallel by providing a plurality of lines in the same facility. Thereby, manufacture can be performed more efficiently.

  After the pretreatment step, as shown in FIG. 4, an attaching step for attaching the sealant film 15 is performed. This pasting step may be performed with the long base material as it is, but the long base material is performed in a state in which the long base material is cut into a predetermined number, for example, several pieces to several hundreds of tab leads. Also good. FIG. 4 shows a state in which the sticking process is performed in a state where the long piece 30 is cut. A predetermined position of the long piece 30 is provided with a positioning hole 31 that can perform positioning feed at the first first position. It is formed by a punching process. In FIG. 4, the long piece 30 cut | disconnected for every six tab leads 10 is made into the example.

  Moreover, in the sticking process of the sealant film 15, as shown in FIG. 4, while punching so that the side 11b is along the longitudinal direction of the long piece 30, and feeding the end 11a to the upstream in the feed direction ( In the case of FIG. 4, it is preferable to apply the sealant film 15 (while moving the long piece 30 leftward). According to this, the one end portion 11 is not caught during feeding, and an efficient operation can be performed. The sealant film 15 appears to be attached only to the front surface side of the long piece 30 in FIG. 4, but is also attached to the back surface side of the long piece 30.

  Further, the timing of cutting into the long pieces 30 may be any timing as long as it is before the sealing step of the sealant film 15, and may be performed before the pretreatment step. For example, it may be before or after the plating process.

  After the step of attaching the sealant film 15, a second punching step is performed to manufacture a plurality of tab leads 10 as shown in FIG. In this second punching process, even if a cut piece or the like is generated in the portion punched in the second punching process due to the position shift, it is a portion protruding from the exterior member 2. Since the punched portion is outside the exterior member 2, the cut pieces are mainly attached to the outside portion of the exterior member 2, so that it is possible to avoid affecting the battery performance.

  The tab lead 10 manufactured in this way is housed in the exterior member 2 with one end 11 connected to the current collector of the power generation element for positive electrode or negative electrode, and the other end 12 protrudes from the exterior member 2. In this state, the opening of the exterior member 2 is sealed by thermocompression bonding or the like so that the exterior member 2 sandwiches the pasting portion of the sealant film 15 of the tab lead 10. Thereby, the opening part of the exterior member 2 is sealed, and the lithium ion battery 1 shown in FIG. 1 is manufactured.

Another example of the tab lead manufacturing method will be described with reference to FIGS.
In this example, the direction of the tab lead 10 relative to the long base material is rotated by 90 °. That is, it is the same as the above-described example except that the end side 11a of the one end portion 11 of the tab lead 10 is arranged along the longitudinal direction of the long base material. Therefore, in the first first punching step, the punching portion 22 surrounding the end side 11a and the side side 11b is formed, and other portions are not punched. 6 and 7 show a state in which the long piece 30 is cut before the step of applying the sealant film 15.

  Thereafter, the plating step is performed as necessary, and after the pretreatment step is performed, the sealant film 15 is continuously pasted as shown in FIG. The sealant film 15 is applied along the feeding direction of the long piece 30 (in the longitudinal direction of the long piece 30, while moving the long piece 30 leftward in the case of FIG. 7), the sealant There exists an effect that sticking of the film 15 can be performed more simply.

  Alternatively, the sealant film 15 may be applied to the feeding direction of the long piece 30 in the short direction of the long piece 30 (in the case of FIG. 7, the long piece 30 is moved upward). In this case, in place of the effect of simple application of the sealant film 15, the one end portion 11 is not caught at the time of feeding, and an effect capable of performing efficient work is obtained.

  In addition, the point which performs a 2nd punching process after sticking of the sealant film 15 is also the same, and the point which a cut piece generate | occur | produces at this time and the influence on the inside of a battery can be excluded is also the same. FIG. 8 shows the tab lead after the second punching step.

  In addition, the sticking process of a sealant film is good also as the multi-slice process performed in parallel by providing several lines in the same installation. Thereby, manufacture can be performed further efficiently.

DESCRIPTION OF SYMBOLS 1 Lithium ion battery 2 Exterior member 10 Tab lead 11 One end part 12 Other end part 13 Connection terminal part 15 Sealant film

Claims (6)

One end part is covered with a battery exterior member, connected to the current collector of the power generation element, and the other end side connecting terminal part protrudes from the battery exterior member to the outside so as to be sandwiched and fixed by the battery exterior member A method of manufacturing a tab lead,
The tab lead is formed with an end side and a pair of side sides continuous to the end side, and a sealant film is attached to a portion of the one end portion sandwiched between the battery exterior members, , The connecting terminal portion of the other end portion has an irregular shape provided to protrude in at least one of the directions intersecting the side,
A first punching step from a long base material to the end side and at least a portion of the pair of side sides to which the sealant film is affixed, and the periphery of the connection terminal portion of the other end is not punched;
A pretreatment step of performing a pretreatment for sticking the sealant film to the punched material on which the first punching step has been performed;
A pasting step of pasting the sealant film on a predetermined position of the pretreatment material on which the pretreatment step has been performed;
A second punching step of punching into individual tab leads from the sealant film adhesive that has been subjected to the pasting step;
A method for producing a tab lead, comprising:   The long base material is wound in a roll shape, and at least after the pretreatment step, the long base material is cut into long pieces including a plurality of the tab leads, and the pasting step is performed by attaching the sealant film to each long piece. The method of manufacturing a tab lead according to claim 1.   2. The tab lead according to claim 1, wherein the long base material is cut into long pieces including a plurality of the tab leads before the pretreatment step, and the pretreatment step is performed for each of the long pieces. Manufacturing method.   The side of the one end of the tab lead is disposed along the longitudinal direction of the long base material, and in the attaching step, the end of the one end is on the upstream side in the feed direction. The method for manufacturing a tab lead according to any one of claims 1 to 3, wherein the sealant film is continuously pasted while feeding a long base material from the upstream side to the downstream side.   The tab lead manufacturing according to any one of claims 1 to 4, wherein at least one of the pretreatment step and the pasting step is a multi-row treatment performed in parallel by providing a plurality of lines in the same equipment. Method. Using the tab lead manufactured by the tab lead manufacturing method according to any one of claims 1 to 5,
Connecting the one end of the tab lead to the current collector;
Covering the connecting portion between the current collector and the one end of the tab lead with the exterior member;
And a step of sealing the opening of the exterior member with the other end projecting from the exterior member.

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