JP2007258062A - Trimming method and trimming device of battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trimming method and a trimming device of a battery in which prevention of a short circuit in trimming is achieved. <P>SOLUTION: This has a conveying process 13 to convey the battery 1 by positioning both electrode tabs 2, 3 protruding from the battery 1 covered by a laminate member 4 at least partly having conductivity at both sides of direction crossing the conveying direction of the conveying means 13 to convey the battery 1, and a trimming process of respectively and separately trimming both electrode tabs 2, 3 respectively by a pair of fittings 14A, 14B and 15A, 15B arranged at different positions in the conveying direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery trimming method and trimming apparatus, and more particularly to a trimming method and trimming apparatus for trimming bipolar tabs of a battery.

  In recent years, a laminate-type lithium battery using a laminate member obtained by pasting a PET sheet on an aluminum foil of several tens of microns has been used. In this battery, the internal electrode of the battery is encapsulated by two laminate members, the surroundings are heat-sealed, and the flange portion is further cut into a predetermined shape and dimension.

When a plurality of lithium batteries are connected in series and assembled into an assembled battery, electrode tabs to be joined may be cut (trimmed) into a predetermined shape (see, for example, Patent Document 1). When trimming, the aluminum foil comes into contact with the mold from the cut surface of the laminate member, and the mold and the electrode tab come into contact with each other, so that both electrodes of the electrode tab may be short-circuited through the mold and the aluminum foil. .
JP 2005-183334 A

  The present invention has been made to solve the problems associated with the above-described prior art, and an object of the present invention is to provide a battery trimming method and trimming apparatus capable of preventing a short circuit during trimming.

  The battery trimming method according to the present invention that achieves the above-described object includes a bipolar tab that protrudes from a battery that is at least partially covered by a conductive laminate member, and a direction that intersects a transport direction of a transport means that transports the battery. A transporting process for transporting the battery positioned on both sides of the battery, and a trimming process for trimming each of the bipolar tabs separately by each of a pair of molds arranged at different positions in the transporting direction across the transporting means, It is characterized by having.

  The battery trimming device according to the present invention that achieves the above object is provided by positioning the bipolar tabs protruding from the battery covered at least partially with a conductive laminate member on both sides in the direction intersecting the transport direction. And a mold group composed of a pair of molds arranged at different positions in the transport direction across the transport means, each of the pair of molds being bipolar Each tab is trimmed separately.

  In the battery trimming method according to the present invention configured as described above, each of the bipolar tabs is separately trimmed by each of the pair of molds arranged at different positions in the transport direction with the transport means interposed therebetween. A short circuit at the time can be prevented.

  The battery trimming device according to the present invention that achieves the above object has a pair of molds arranged at different positions in the transport direction across the transport means, so that each of the bipolar tabs can be trimmed separately, A short circuit during trimming can be prevented.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a laminate type lithium ion battery, (A) is a plan view, (B) is a cross-sectional view taken along the line II of (A), and FIG. 2 shows a battery trimming apparatus according to this embodiment. FIG. 3 is a schematic plan view, and FIG. 3 is a sectional view taken along line III-III in FIG.

  The battery 1 in the present embodiment has a flat rectangular shape as shown in FIG. 1, and is led out from the side where the positive electrode tab 2 (electrode tab) and the negative electrode tab 3 (electrode tab), which are electrode terminals, face each other. In the battery 1, a plurality of positive plates and negative plates, which are power generation elements, are alternately stacked with a separator interposed therebetween, and these are stored between two laminate members 4 together with an electrolytic solution. The laminate member 4 is formed, for example, by attaching a PET sheet to an aluminum foil having a thickness of several tens of microns.

  The periphery of the two laminate members 4 is heat-sealed and sealed, and the flange portion is further cut and processed into a predetermined shape and size. The positive electrode tab 2 is electrically connected to the positive electrode plate inside the two laminate members 4, and the negative electrode tab 3 is electrically connected to the negative electrode plate.

  In the plurality of batteries 1 formed in this way, the electrode tabs are joined together by welding or the like, and are electrically connected in series or in parallel.

  The battery trimming apparatus 10 according to this embodiment is an apparatus for trimming the electrode tabs 2 and 3 of the battery 1 already covered with the laminate member 4. As shown in FIG. 2, the battery trimming device 10 includes a carry-in unit 11 for carrying in the battery 1, a carry-out unit 12 for carrying out the battery 1, a conveyor 13 as a conveying means for carrying the battery 1, 2 Two mold groups 14 and 15.

  As shown in FIGS. 2 and 3, the battery 1 is fixed on the holding jig 16, and the bipolar tabs 2 and 3 (both electrode tabs) are positioned at both ends in the direction intersecting the transport direction, and the carry-in portion 11. From the conveyor 13, the bipolar tabs 2, 3 are processed in the mold groups 14, 15, and then unloaded from the unloading unit 12.

  The mold group 14 has a pair of molds 14A and 14B arranged at different positions in the transport direction across the conveyor 13, and the mold group 15 is similarly located at a position different in the transport direction across the conveyor 13. It has a pair of molds 15A and 15B to be arranged. The pair of molds in the same mold group is for trimming the positive electrode tab 2 and the negative electrode tab 3 of the same battery 1. Therefore, by providing the two mold groups 14 and 15, two types of batteries 1 having different electrode tabs 2 and 3 can be processed.

  In the present embodiment, the molds 15A, 15B, 14A, and 14B of different mold groups are arranged at positions facing each other with the conveyor 13 of the respective molds 14A, 14B, 15A, and 15B interposed therebetween.

  FIG. 4 is a cross-sectional view of a mold for explaining trimming, (A) shows before trimming, (B) shows after trimming, and FIG. 5 shows a mold for explaining short-circuit between electrode tab and aluminum foil. FIG. 6 is a schematic plan view of a trimming apparatus when one of the mold groups is used, (A) is for trimming one of the electrode tabs, and (B) is for trimming the other of the electrode tabs. FIG. 7 is a schematic plan view of a trimming apparatus when the other of the mold group is used. FIG. 7A shows a trimming of one of the electrode tabs, and FIG. 7B shows a trimming of the other of the electrode tabs. .

  When trimming the electrode tabs 2 and 3 in each mold, first, the bipolar tabs 2 and 3 protruding from the battery 1 covered with the laminate member 4 are placed on both sides in the direction intersecting the conveying direction of the conveyor 13. The battery 1 is conveyed by being positioned (conveying step). Next, as shown in FIG. 4, the conveyor 13 is stopped and the battery 1 is positioned between the upper mold 17 and the lower mold 18 of the mold. Next, the upper mold 17 of the mold is lowered to sandwich the battery 1 between the upper mold 17 and the lower mold 18 (see FIG. 4A). At this time, the electrode tab 2 or 3 is held together with the laminate member 4. Thereafter, a punching process is performed in which the punch 19 existing inside the upper die 17 is lowered and the remaining portion 23 is cut off by the edge 21 of the hole 20 of the lower die 18 and the edge 22 of the punch 19 (see FIG. 4B). ). Thereafter, the upper mold 17 is raised to open the battery 1, and the battery 1 is sent to the next process by the conveyor 13. At the time of this trimming, as shown in FIG. 5, the lower mold 18 (or the upper mold 17) and the electrode tab 2 or 3 are in contact, and the aluminum foil 25 is further removed from the cut surface of the laminate member 4 by the lower mold 18 (or There is a possibility of contact with the upper mold 17). When trimming is performed simultaneously on both electrode tabs 2 and 3, both electrodes of electrode tabs 2 and 3 may be short-circuited via lower mold 18 (or upper mold 17) and aluminum foil 25, and battery 1 may be damaged. . In addition, although it is also possible to affix an insulating tape on the cut surface of the laminate member 4, the process for affixing the tape increases and the cost of the tape increases.

  Further, as shown in FIG. 9, by arranging the paired molds 31A, 31B and 32A, 32B alternately, it is possible to prevent the battery 1 from being short-circuited without simultaneously trimming both electrodes tabs 2 and 3. However, since the molds are alternately arranged, the line length becomes long and the cost increases.

  In this embodiment, when manufacturing the battery 1 corresponding to the mold group 14, as shown in FIG. 6, first, one electrode tab 2 or 3 is processed in the mold 14A (see FIG. 6A). Thereafter, the other electrode tab 3 or 2 is processed in the mold 14B (see FIG. 6B). When the battery 1 corresponding to the mold group 15 is manufactured, as shown in FIG. 7, first, one electrode tab 2 or 3 is processed in the mold 15A (see FIG. 7A). Later, the other electrode tab 3 or 2 is processed in the mold 15B (see FIG. 7B).

  The determination of which mold is to be operated is made by, for example, a proximity switch (not shown) attached to the mold (detection step). The holding jig 16 on which the battery 1 is placed is provided with contacts (not shown) having different positions or shapes corresponding to the molds for processing the battery 1 to be placed. Proximity switches that react to the shape are provided on the mold. Therefore, by using the predetermined holding jig 16, it is possible to arbitrarily select and operate the mold to be processed (mold operation step).

  Further, the proximity switch may be a non-contact type, or may be controlled by a program using, for example, a shift register without using the proximity switch for determining a mold to be operated.

  The battery trimming apparatus 10 according to the present embodiment can trim each of the bipolar tabs 2 and 3 separately because the pair of molds are provided in different positions in the transport direction across the conveyor 13 (transport means). A short circuit during trimming can be prevented. In addition, since the molds 15A, 15B, 14A, and 14B of the other mold groups are located at positions where the molds 14A, 14B, 15A, and 15B are opposed to each other, the line length can be shortened and the installation area is reduced. And cost can be reduced.

  Further, since the electrode tab 2 or 3 is clamped together with the laminate member 4 at the time of trimming, a wide range can be clamped and the trimming can be reliably performed without shifting the electrode tab even during processing.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, when there are three types of electrode tabs, as shown in FIG. 8, three mold groups 41, 42 and 43 are arranged so that the pair of molds are different in the transport direction with the transport means interposed therebetween. Furthermore, the molds of other mold groups can be arranged at positions facing the molds, and four or more mold groups can be arranged similarly.

  Moreover, the press machine (pressing means) for pressing a metal mold | die can be shared in the metal mold | die which opposes. For this purpose, for example, a slider mechanism (mold moving means) is installed so that the mold can be moved close to and away from the conveyor (conveying means). And the press which presses the metal mold | die close to a conveyor among the two metal mold | dies which oppose on both sides of a conveyor is provided. When trimming is performed, a mold to be trimmed is brought close to the conveyor (mold moving process), and the mold is pressed by a press machine (pressing process).

2A and 2B show a laminate-type lithium ion battery, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line II of FIG. It is a schematic plan view which shows the trimming apparatus of the battery which concerns on this embodiment. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing of the metal mold | die for demonstrating trimming, (A) shows before trimming and (B) shows after trimming. It is a fragmentary sectional view of the metal mold | die for demonstrating the short circuit of an electrode tab and aluminum foil. It is a schematic plan view of the trimming apparatus when using one of the mold groups, (A) shows one trimming of the electrode tab, and (B) shows one trimming of the other electrode tab. It is a schematic plan view of the trimming apparatus at the time of using the other of a metal mold group, (A) at the time of one trimming of an electrode tab, (B) shows the time of the other trimming of an electrode tab. It is a schematic plan view which shows the trimming apparatus at the time of providing three metal mold groups. It is a schematic plan view of the trimming apparatus when the molds of the mold group are alternately arranged.

Explanation of symbols

1 battery,
2 positive electrode tab (electrode tab),
3 Negative electrode tab (electrode tab),
4 Laminate material,
10 Battery trimming device,
13 conveyor (conveying means),
14, 15 Mold group,
16 holding jig,
14A, 14B, 15A, 15B mold,
17 Upper mold,
18 Lower mold,
25 Aluminum foil.

Claims (10)

A transporting step for transporting the battery by positioning the bipolar tabs protruding from the battery covered at least partially by a conductive laminate member on both sides of the transporting direction of the transporting means for transporting the battery;
And a trimming step of trimming each of the bipolar tabs separately by each of a pair of molds arranged at different positions in the transport direction with the transport means interposed therebetween.   There are a plurality of mold groups composed of the pair of molds, and the molds of the other mold groups are arranged at positions facing each other with the conveying means of each mold paired in the mold group. The battery trimming method according to claim 1, wherein: A mold moving step of moving the mold close to and away from the conveying means;
The battery trimming method according to claim 2, further comprising: a pressing step of pressing a mold adjacent to the conveyance unit among the two molds opposed across the conveyance unit. A detection step of detecting the proximity of the battery conveyed by the conveying means;
The battery trimming method according to any one of claims 1 to 3, further comprising a mold moving step of operating the mold based on a result detected by the detecting step.   The battery trimming method according to claim 1, wherein the trimming step is performed by sandwiching a laminate member with the mold. Transport means for transporting the battery by positioning the bipolar tabs protruding from the battery covered at least partially by the conductive laminate member on both sides in the direction intersecting the transport direction;
A mold group composed of a pair of molds arranged at different positions in the transport direction across the transport means; and
The battery trimming apparatus, wherein each of the pair of molds trims each of the bipolar tabs separately.   There is a plurality of the mold groups, and molds of other mold groups are arranged at positions facing each other with the conveying means of each mold paired in the mold group. Item 7. The battery trimming device according to Item 6. Mold moving means for moving the mold close to and away from the conveying means;
The battery trimming apparatus according to claim 7, further comprising: a pressing unit that presses a mold adjacent to the conveyance unit among the two molds facing each other with the conveyance unit interposed therebetween.   The battery according to any one of claims 6 to 8, wherein a proximity switch for detecting the proximity of the battery conveyed by the conveying means and moving the mold is provided in the vicinity of the mold. Trimming device.   The battery trimming apparatus according to any one of claims 6 to 9, wherein the mold sandwiches a laminate member of the battery.

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