JP5198723B2 - Sealing plate for sealed battery - Google Patents

Sealing plate for sealed battery Download PDF

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Publication number
JP5198723B2
JP5198723B2 JP2005172491A JP2005172491A JP5198723B2 JP 5198723 B2 JP5198723 B2 JP 5198723B2 JP 2005172491 A JP2005172491 A JP 2005172491A JP 2005172491 A JP2005172491 A JP 2005172491A JP 5198723 B2 JP5198723 B2 JP 5198723B2
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Japan
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portion
formed
base material
sealing plate
valve
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JP2005172491A
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Japanese (ja)
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JP2006351234A (en
Inventor
敏弘 小田垣
和哉 中村
啓 藤井
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冨士発條株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

  The present invention relates to a sealing plate for a sealed battery used for a sealed battery such as a lithium ion battery, a manufacturing mold and a manufacturing method thereof.

  For example, in a sealed secondary battery such as a lithium ion battery, a safety valve is provided and the internal pressure of the battery must be released when an abnormality occurs.

  As one method therefor, (Patent Document 1) describes a sealing plate 2 that seals a battery case 1 as shown in FIG. 9 provided with a valve function by coining two times. ing.

That is, in the sealing plate 2, the recess 3 is formed by the first coining process. At this time, the bottom surface of the formed recess 3 is formed into a flat thin plate shape. Further, an S-shaped groove 4 is formed on the bottom surface of the concave portion 3 formed by the first coining by a second coining process, and the concave portion 3 formed with the groove 4 is expanded to the opening side as shown in FIG. It was made to come out. The concave portion 3 of the sealing plate 2 thus bulged has a minimum thickness at the groove 4 portion. Therefore, when the internal pressure of the case 1 exceeds the set breaking pressure of the groove 4 portion where the wall thickness is minimized, the internal pressure is released sequentially.
Japanese Patent Laid-Open No. 2002-367583

  However, in the case where the coining process is performed as described above, there is a problem that micro cracks are generated inside the base material due to the surplus generated during the first coining process.

  That is, in the coining process as described above, as indicated by (a) → (c) in FIG. 10, the flattened base material 10 is compressed and the density is increased as the impression proceeds, and deformation occurs due to stress. To increase the thickness. Since a dense portion is formed in the base material 10 in this way, the metal flow occurs in a wave shape, and as shown in FIG. 10C, a microcrack 6 is generated in the cross section, causing internal fracture. As a result, there is a problem that the sealing performance of the valve portion is impaired and a fatal defect is generated. Therefore, an object of the present invention is to eliminate defects caused by inconsistent metal flow when forming by coining, and at the same time, use the surplus to flesh around the vulnerable valve part to protect or reinforce Or do both.

In order to solve the above-described problems, in the present invention, a base material portion is provided in the vicinity of a valve portion in which the base material of the sealing plate is formed into a thin film, and a surplus at the time of molding the valve portion is formed outside the base material portion. Thus, a configuration in which the projecting portion filled with the molding was formed was adopted.

  By adopting such a structure, the metal flow generated in a wave shape when the valve part is formed into a thin film (thin plate) is formed in the vicinity of the valve part to escape (accommodate). ). At that time, by forming the protrusion around the fragile valve portion, the fragile portion is protected or reinforced.

  In addition, the surplus at the time of the said shaping | molding is made into the quantity (wall quantity) of the base material which protrudes by pressure stamping (press work).

  At this time, the structure which shape | molds a protrusion so that it may surround the circumference | surroundings of a valve part or through a valve part can be employ | adopted.

  By adopting such a configuration, the protrusions are provided so as to surround the periphery of the valve part or opposed to each other via the valve part, for example, around the fragile valve part or the opposite side of the valve part. Since the thickness of the portion is increased by the amount of the molded protrusion and the rigidity is increased, the valve portion surrounded or sandwiched between them can be protected.

  Since the present invention is configured as described above, it is possible to escape (accommodate) a metal flow generated in a wave shape during coining, so that internal breakage can be prevented. As a result, it is possible to give a good sealing property to the valve portion without causing a fatal defect. At the same time, the surplus meat can be used to thicken the periphery of the fragile valve portion for protection and / or reinforcement.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows this type of sealing plate 2 '. The sealing plate 2 ′ is obtained by forming a protrusion 14 in the vicinity of the valve portion 11 formed by forming the base material 10 into a thin film. However, the thing of FIG. 1 is a thing just after coining process, and does not shape | mold the stamp by auxiliary molding which is mentioned later. The reason for showing the one immediately after the coining is to make the present invention easier to understand.

  The base material 10 is made of an aluminum alloy, and is formed into a square shape (not limited to the shape because there are other round shapes) that match the opening of the battery case. In addition, a flange is provided around the square so as to be joined to the opening of the battery case. Further, a valve portion 11 formed in a thin film as shown in FIG. Incidentally, on both sides of the valve portion 11, through holes for attaching terminals in a subsequent process are provided as will be described later.

  On the other hand, the valve portion 11 is formed into an oval shape, and the bottom surface of the oval shape is formed into a flat thin film as shown in FIG. A protrusion 14 is formed in the vicinity of the valve portion 11, that is, around the oval valve portion 11 in this form so as to surround the valve portion 11 (the protrusion is limited to this). However, as will be described later, various forms such as, for example, facing each other through a valve portion are conceivable). Here, the protrusions 14 are also formed on the back side of the substrate 10 as shown in FIG.

  This configuration is configured as described above. When the metal flow 15 is generated in a wave shape as shown in FIG. 3 by coining, for example, in the sealing plate 2 ′, the generated metal flow 15 is transferred to the protrusion 14. Therefore, it is difficult to form a portion that is dense or thick in the density of the base material 10. For this reason, micro cracks (micro cracks) are not generated, and micro cracks are not generated inside the substrate and internal breakage is not generated. As a result, good sealing performance can be imparted to the valve portion 11.

  Further, since the protrusion 14 configured as described above is thicker than the base material 10, the thin fragile valve portion 11 surrounding the periphery can be protected from external force (for example, bending pressure). it can.

  Next, a coining (transfer) mold for forming such a sealing plate 2 'will be described.

  That is, the mold for forming the sealing plate 2 ′ is one in which a pocket 24 and a meat stopper 25 are formed in a punch die 21 of a punch 20 and a receiving die 23 of a die 22 as shown in FIG.

  When the base material 10 is pressed with the mold configured as described above, the metal flow 15 of the base material from the thin film portion of the valve portion 11 is accommodated in the pocket 24 as shown in FIG. At that time, the metal flow 15 accommodated in the pocket 24 is stopped by the meat stopper 25 so that the pocket 24 is just filled. By doing so, the uniform protrusions 14 are formed so as not to increase the density or to be deformed by stress to increase the thickness. Therefore, the size of the pocket 24 and the position of the meat stopper 25 are designed so that the pocket 24 is just filled with the metal flow 15 by the pressure of the valve portion 11 in this way.

  Therefore, by absorbing the metal flow 15 in the pocket 24 in this way, the metal flow 15 does not overlap in a wave shape, and it is difficult to form a portion with a dense density of the base material 10. Therefore, the micro crack does not occur, and the micro crack is generated inside the base material and the internal fracture is not generated. As a result, good sealing performance can be imparted to the valve portion 11.

  FIG. 5A shows the above-described meat stopper 25 as a separate body from the punch 20 and the die 22 shown in FIG. 4A. A pressing force is applied to the separate meat stopper 25 via an elastic body 26 during molding. Thus, the substrate 10 is in contact with the substrate 10.

  By doing in this way, the timing which the meat stop 25 act | operates is adjusted with the elastic pressure of the elastic body 26, and the quantity of the metal flow 15 is adjusted.

  In other words, in this embodiment, there are two types of material stoppers 25 on the punch 20 side, A and B, and the material stopper 25 of A has a stopper surface as an inclined surface, and the gap on the side away from the punch 20 becomes narrower. It is like that. On the other hand, the meat stopper 25 on the die 22 side is formed in the die holder.

  Further, an elastic body 26 is attached between each of the meat stoppers 25 and the back plate 27 of the press so that a pressing pressure is applied to the substrate 10 at the time of pressing.

  Here, a spring is used for the elastic body 26, but urethane, a hydraulic damper, or the like can be used in addition to this.

  At that time, the metal flow 15 is controlled by selecting the length of the spring which is the elastic body 26 and the elastic pressure of the spring by predicting the finish and the flow of the metal flow 15. For example, in the case of FIG. 5a, the spring of the B meat stopper 25 is set stronger than the A meat stopper 25, but by setting in this way, when the impression is applied to the substrate 10 as shown in FIG. The protrusion 14 can be formed as shown in FIG. 5B by stopping the flow of the metal flow 15 by pressing the metal stopper 15 more strongly against the base material 10 than the stopper 25 of A.

Next, the manufacturing method of sealing plate 2 'using the said metal mold | die is described. In this manufacturing method, the coil-shaped base material 10 is pressed as a fixed-size feed (press progressive feed method), as shown in FIG.
1. Pilot drilling (punching)
2. 2. Slit processing Compression processing by preliminary coining,
4). 4. Coinig molding Auxiliary molding Drilling (punching)
7). Trimming (Punching)
It consists of seven steps.

  That is, the pilot drilling process is a mold process for feed positioning by a pilot pin. When the pilot hole process can be performed, a constant dimension feed is performed to perform a slit process.

  The slit processing is a process for cutting out one sealing plate 2 ′ from the coil-shaped base material 10, and is processed by inserting a slit 30 around the area of the base material 10 required for one sealing plate 2 ′. . When slitting is possible, preliminary coining is performed.

  The preliminary coining is to perform preliminary compression on a portion where a large metal flow 15 is predicted on the sealing plate 2 ′, and this preliminary compression may be omitted depending on the size and shape of the sealing plate.

  This coining is a process performed using the mold described in FIGS. 5a and 5b, and as described above, the meat stopper 25 having a stopper function for constraining the metal flow 15 of the substrate 10 to the mold. Is used. In addition, a pocket 24 is provided for predicting the movement of the meat and escaping (accommodating) the metal flow 15, and a structure that actively invites the flow of the meat by freeing a place and movement where a large amount of meat is to be collected is provided.

  Further, when the punch 20 enters the base material 10 at the time of the coining, the base material 10 which has been in a flat plate state is compressed, and a portion where the density is increased and a portion where the thickness is deformed due to the stress are increased. At this time, the meat stopper 25 receives a reaction force. For this reaction force, the projecting portion 14 that absorbs the metal flow 15 is formed in the vicinity of the valve portion formed with a thin film (plate) by using the strength of the elastic body (spring) 26 to adjust the moving timing. To do.

  When the forming of the protrusion 14 is completed, the stamping process or forming on the thin film (plate) of the valve part is performed as auxiliary forming. Next, a hole for a terminal necessary as a part is formed by punching. Then, trimming is performed while maintaining the shape of the outer peripheral portion. The trimmed product is taken out so that there are no defects such as deformation and scratches.

  The sealing plate manufactured in this way can cause the metal flow 15 generated in a wave shape at the time of coining to be formed and escaped (accommodated) in the protrusion 14, so that the internal fracture that is a fatal defect does not occur. Therefore, the sealing performance of the valve part 11 can be improved.

  This example shows the shape of the valve portion and the protrusion, and FIG. 7A shows an embodiment in which the valve portion 11 is an oval shape and the protrusion 14 is formed around it. FIGS. 7B and 7C show a mode in which the protrusions 14 are formed to face each other via the valve portion 11, and a plan view and a sectional view are shown together. Furthermore, other modes including those of FIG. 7 are classified and shown in FIGS. 8a and 8b.

Perspective view of an embodiment Sectional drawing of the principal part of embodiment Action explanatory diagram of the embodiment Action explanatory diagram of the embodiment Action explanatory diagram of the embodiment Action explanatory diagram of the embodiment Action explanatory diagram of the embodiment (A), (b), (c) Plan view and sectional view of Example 1 Plan view of Example 1 Plan view of Example 1 Cross section of conventional example Action explanatory diagram of conventional example

Explanation of symbols

2 'Sealing plate 10 Base material 11 Valve portion 14 Protrusion portion 15 Metal flow 20 Punch 21 Punch die 22 Die 23 Receiving die 24 Pocket 25 Meat stopper 26 Elastic body

Claims (2)

  1. A base material portion was provided in the vicinity of the valve portion (11) in which the aluminum base material (10) was formed into a thin film, and the outer portion of the base material portion was filled with a surplus at the time of forming the valve portion (11) . A sealing battery sealing plate (2 ') characterized in that a protrusion (14) is formed and the periphery of the fragile valve part (11) is protected and / or reinforced by the protrusion (14). ).
  2. So as to surround the periphery of the protrusion valve portion (14) (11), or sealed battery sealing plate according to claim 1 which is formed opposite via a valve unit (11) (2 ') .
JP2005172491A 2005-06-13 2005-06-13 Sealing plate for sealed battery Active JP5198723B2 (en)

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JP2005172491A JP5198723B2 (en) 2005-06-13 2005-06-13 Sealing plate for sealed battery

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Publication number Priority date Publication date Assignee Title
JP4210961B1 (en) 2007-07-23 2009-01-21 トヨタ自動車株式会社 Battery with battery case and sealing plate
WO2010116504A1 (en) 2009-04-09 2010-10-14 トヨタ自動車株式会社 Battery, vehicle, and equipment using battery
JP5623089B2 (en) * 2010-01-28 2014-11-12 冨士発條株式会社 Battery sealing plate, method for manufacturing the sealing plate, and manufacturing mold
US8658296B2 (en) 2010-02-25 2014-02-25 Samsung Sdi Co., Ltd. Rechargeable battery
WO2012039247A1 (en) * 2010-09-24 2012-03-29 三洋電機株式会社 Prismatic sealed battery
JP5596647B2 (en) * 2010-10-13 2014-09-24 株式会社ソーデナガノ Battery case lid manufacturing method
CN103155214B (en) 2010-10-13 2016-02-10 早出长野股份有限公司 The manufacture method of battery container lid and battery container lid
JP5608142B2 (en) * 2010-10-26 2014-10-15 株式会社ソーデナガノ Battery case lid
KR101243398B1 (en) * 2011-02-10 2013-03-13 로베르트 보쉬 게엠베하 Rechargeable battery
JP5250138B2 (en) 2011-08-09 2013-07-31 日新製鋼株式会社 Battery case lid
JP6044818B2 (en) * 2012-03-29 2016-12-14 株式会社Gsユアサ Exterior container, storage element
CN104285314B (en) * 2013-02-26 2017-02-22 株式会社Lg 化学 Secondary battery and manufacturing method therefor
KR101611316B1 (en) * 2014-07-04 2016-04-11 (주)성우 Method and apparatus for forming cap of battery based on progressive die
CN110293197A (en) * 2018-03-22 2019-10-01 深圳市瑞德丰精密制造有限公司 The pier pressure method and former material and battery cover board of a kind of battery cover board

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JPH0239620Y2 (en) * 1985-05-16 1990-10-24
JPH08212987A (en) * 1994-11-29 1996-08-20 Toshiba Corp Secondary battery container and manufacture thereof
JP3815852B2 (en) * 1997-06-09 2006-08-30 新生化学工業株式会社 Manufacturing method of battery sealing body
JP2002015665A (en) * 2000-06-29 2002-01-18 Toshiba Corp Manufacturing method of electron gun electrode and its equipment, electron gun electrode, and electron gun
JP4015414B2 (en) * 2001-12-14 2007-11-28 三菱重工業株式会社 Secondary battery and secondary battery container
JP2003297323A (en) * 2002-04-04 2003-10-17 Alps Electric Co Ltd Safety device for secondary battery

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