JP5434161B2 - Assembled battery - Google Patents

Assembled battery Download PDF

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Publication number
JP5434161B2
JP5434161B2 JP2009061357A JP2009061357A JP5434161B2 JP 5434161 B2 JP5434161 B2 JP 5434161B2 JP 2009061357 A JP2009061357 A JP 2009061357A JP 2009061357 A JP2009061357 A JP 2009061357A JP 5434161 B2 JP5434161 B2 JP 5434161B2
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Japan
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spacer
assembled battery
thermistor
flange
temperature measuring
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JP2010218755A (en
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直人 轟木
竜一 雨谷
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日産自動車株式会社
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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 an assembled battery in which a plurality of secondary batteries having a power generation element sealed inside an exterior member are formed by laminating the outer periphery of the exterior member to form a flange, and the secondary batteries are directly stacked. Is.

  A battery pack in which film-sheathed batteries are housed in respective cases and stacked to form a predetermined space between the film-sheathed batteries, in which irregularities for inserting a thermistor are formed in the case are known. (For example, refer to Patent Document 1).

International Publication No. 2006/06973

  When the secondary batteries are directly stacked without any gap, the thermistor cannot be inserted between the secondary batteries with the above structure, and the temperature of the secondary battery cannot be measured. There was a problem that there was.

  The problem to be solved by the present invention is to provide an assembled battery capable of measuring the temperature of a directly stacked secondary battery.

  This invention solves the said subject by providing the spacer with the guide part which inserts a temperature measurement means in the space divided by the adjacent secondary battery and spacer.

  According to the present invention, since the temperature measuring means can be inserted into the space defined by the adjacent secondary battery and the spacer through the guide portion provided in the spacer, the secondary battery directly stacked. Temperature can be measured.

FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention as viewed from the front. FIG. 2 is a perspective view of the battery module in the embodiment of the present invention as seen from the back. FIG. 3 is a perspective view showing a single cell used in the battery module in the embodiment of the present invention. FIG. 4 is a perspective view of the cell unit of the battery module shown in FIG. 1 as viewed from the tab non-leading side. FIG. 5 is a side view of the cell unit shown in FIG. FIG. 6 is a perspective view of the third and fourth spacers as viewed from above according to the embodiment of the present invention. FIG. 7 is a perspective view of the third and fourth spacers as viewed from below according to the embodiment of the present invention. FIG. 8 is a perspective view showing a state in which the third and fourth spacers are connected in the embodiment of the present invention. FIG. 9 is a front view of the insertion hole formed by the third and fourth spacers shown in FIG. FIG. 10 is a perspective view showing the thermistor in the embodiment of the present invention. FIG. 11 is a cross-sectional view showing a clip of the thermistor in the embodiment of the present invention. FIG. 12 is a perspective view showing how the thermistor is inserted into the insertion hole of the battery module case in the embodiment of the present invention. FIG. 13 is a perspective view in which the case is omitted from FIG. FIG. 14 is a perspective view showing a state in which the thermistor is mounted on the battery module in the embodiment of the present invention. FIG. 15 is a perspective view in which the case is omitted from FIG. FIG. 16 is a side view of the cell unit in which the thermistor is inserted in the embodiment of the present invention. FIG. 17 is a cross-sectional perspective view of the battery module in which the thermistor is inserted in the embodiment of the present invention. FIG. 18 is a cross-sectional perspective view of the battery module in which the thermistor is inserted in the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of the battery module according to the present embodiment as viewed from the front, FIG. 2 is a perspective view of the battery module according to the present embodiment as viewed from the back, and FIG. 3 illustrates a single cell used in the battery module according to the present embodiment. 4 is a perspective view of the cell unit of the battery module shown in FIG. 1 as viewed from the tab non-leading side, and FIG. 5 is a side view of the cell unit shown in FIG.

  The battery module 10 includes a cell unit 20 (see FIGS. 4 and 5) including a plurality (four in this example) of single cells 30, and a case 50 that accommodates the cell unit 20 therein. . The battery module 10 is mounted on an electric vehicle or the like as an energy supply source, for example, and an in-vehicle battery having a desired voltage and energy capacity is configured by connecting an arbitrary number of battery modules 10 in series or in parallel. .

  The cell unit 20 includes four unit cells 30A to 30D and spacers 41 to 45 attached to both ends of the unit cells 30A to 30D.

  A unit cell (cell) 30 shown in FIG. 3 houses, for example, a power generation element composed of an electrode laminate and an electrolyte in which positive plates and negative plates are alternately laminated via separators, in an exterior member 31. It is a lithium ion secondary battery. The single battery 30 is a general term for the single batteries 30A to 30D.

  The exterior member 31 of the unit cell 30 is composed of, for example, a laminated film in which a synthetic resin layer is laminated on both surfaces of a metal foil. The exterior member 31 seals the power generation element inside by heat-sealing the four sides in a state where the power generation element is accommodated to form a flange 32.

  Further, the positive electrode plate and the negative electrode plate constituting the power generation element are connected to the positive and negative electrode tabs 34 led out from the exterior member 31, but in the unit cell 30 in the present embodiment, one short side of the exterior member 31 is connected. Bipolar electrode tabs 34 are led out only from the sides, and electrode tabs 34 are not led out from the other short side. A fixing hole 33 into which a fixing pin of a spacer described later is inserted is formed in a portion of the flange 32 on the tab non-leading side.

  In the cell unit 20, the four unit cells 30 </ b> A to 30 </ b> D are stacked so that they are in close contact with each other and the electrode tabs 34 are led out in the same direction, as shown in FIGS. 4 and 5. Five spacers 41 to 45 are attached to the end portion on the side where 34 is not led out. The flange 32 of the uppermost unit cell 30 </ b> A is located between the first spacer 41 and the second spacer 42. Further, the flange 32 of the second cell 30B is located between the second spacer 42 and the third spacer 43, and the flange 32 of the third cell 30C is connected to the third spacer 43 and the fourth spacer 43. It is located between the spacers 44. Further, the flange 32 of the fourth unit cell 30 </ b> D is located between the fourth spacer 44 and the fifth spacer 45.

  Here, the detailed structure of the spacer will be described with reference to FIGS. 6 to 8 by taking the third and fourth spacers 43 and 44 as an example.

  6 to 8 are views showing the third and fourth spacers in the present embodiment, FIG. 9 is a view of the guide portion formed by the third and fourth spacers shown in FIG. FIG. 11 is a perspective view showing a thermistor in the present embodiment, and FIG. 11 is a cross-sectional view showing a clip of the thermistor in the present embodiment.

  As shown in FIGS. 6-8, the 3rd spacer 43 is a substantially plate-shaped member comprised from the material excellent in electrical insulation, such as a synthetic resin material. Two fixing pins 431 to be inserted into the fixing holes 33 of the flange 32 of the second unit cell 30 </ b> B are formed on the upper surface of the third spacer 43. A sleeve insertion hole 432 into which the sleeve 46 (see FIG. 4) is inserted is formed at both ends of the third spacer 43, and an engagement projecting upward is formed near the sleeve insertion hole 432. A nail 433 is formed. The engaging claw 433 engages with an engaging hole (not shown) formed in the lower surface of the second spacer 42, whereby the second spacer 42 and the third spacer 43 are connected.

  The third spacer 43 according to the present embodiment includes a protrusion 435 extending in the Y direction in FIG. 6 and a first protrusion 436 that protrudes in the same direction as the protrusion 435. As shown in FIG. 7, a first insertion groove 437 into which the thermistor 70 can be inserted is formed continuously on the back side of the convex portion 435 and the first protrusion 436. The first insertion groove 437 has a depth larger than the diameter of the thermistor 70.

  Similarly to the third spacer 43, the fourth spacer 44 is a substantially plate-like member made of a material having excellent electrical insulation such as a synthetic resin material, and includes a fixing pin 441, a sleeve insertion hole 442, and an engagement. A claw 443 is provided. The engagement of the engagement claw 443 with the engagement hole 434 formed on the lower surface of the third spacer 43 connects the third spacer 43 and the fourth spacer 44.

  The fourth spacer 44 of the present embodiment has a second protrusion 444 that protrudes in the Y direction in the drawing so as to correspond to the first protrusion 436 of the third spacer 43. A second insertion groove 445 having an arcuate cross-sectional shape is formed on the upper surface of the second protrusion 444.

  As shown in FIGS. 8 and 9, when the third spacer 43 and the fourth spacer 44 are connected in this embodiment, the first insertion groove 437 of the third spacer 43 and the fourth spacer are provided. An insertion hole having a substantially circular cross section into which the thermistor 70 can be inserted is formed by the second insertion groove 445 of 44. The first, second and fifth spacers 41, 42 and 45 are not provided with a structure for inserting the thermistor 70.

  In the present embodiment, by providing a mechanism for inserting the thermistor 70 into the third spacer 43 located in the center in the stacking direction, the thermistor 70 and the single cells 30B, 30C are caused by the expansion of the single cell due to deterioration or charge / discharge. Contact can be prevented. When the number of stacked spacers is an even number, a thermistor insertion structure is provided in at least one of the two spacers located at the center.

  Further, in the present embodiment, in consideration of workability at the time of injection molding of the third and fourth spacers 43 and 44, the first insertion groove 437 is formed in the third spacer 43, and the fourth spacer 44. Although the second insertion groove 445 is formed in the second embodiment, the present invention is not particularly limited thereto. For example, an insertion hole for inserting the thermistor 70 may be formed in the third spacer 43, and the second insertion groove may not be formed in the fourth spacer 44.

  Although not particularly illustrated, five spacers are also attached to the end portions of the four unit cells 30A to 30D where the electrode tabs 34 are led out, and the electrode tabs 34 of the respective unit cells 30A to 30D are provided. Are electrically connected to the external output terminals 61 and 63 via a bus bar or the like.

  The cell unit 20 configured as described above is accommodated in the case 50 shown in FIGS. 1 and 2. The case 50 includes a box-shaped lower case 51 whose upper portion is open, and an upper case 52 that closes the opening of the lower case 52. The lower case 51 and the upper case 52 are fixed by winding the edges of each other (see FIG. 14).

  As shown in FIG. 1, four bolt insertion holes 514 are formed in the upper case 52 so as to correspond to the sleeve 46 of the cell unit 20. Although not particularly shown, the lower case 51 is also formed with four bolt insertion holes so as to correspond to the sleeve 46 of the cell unit 20. The cell unit 20 is fixed in the case by inserting bolts into the insertion holes 514 of the upper case 52, the sleeves 46 of the cell unit 20, and the insertion holes of the lower case 51.

  As shown in FIG. 1, on the front side of the battery module 10, three notches 511 to 513 are formed on the side surface of the lower case 51, and from these notches 511 to 513, an external output positive electrode terminal 61, A voltage detection terminal 62 and an external output negative terminal 63 are respectively led out. As shown in FIG. 2, an insertion hole 515 (see FIG. 12) for inserting the thermistor 70 is formed in the side surface of the lower case 51 on the back side of the battery module 10. The insertion hole 515 is disposed at a position corresponding to the first and second insertion grooves 437 and 445 of the cell unit 20 accommodated in the case 50. In addition, notches 516 (see FIG. 11) with which the engaging claws 72 of the clip 71 of the thermistor 70 are engaged are formed on both sides of the insertion hole 515.

  As shown in FIG. 10, a substantially W-shaped clip 71 is integrated with a columnar thermistor 70 inserted into the insertion hole 515 of the lower case 51. The clip 71 is elastically deformable in the width direction, and has an engaging claw 72 that can engage with the notch 516 of the lower case 51 at the tip, as shown in FIG. The engagement claw 72 is engaged with the notch 516 so that the clip 70 can be attached to the case 50 with one touch. Note that the engaging claw 72 of the clip 71 and the notch 516 of the case 50 are shown only in FIG. 11, and are not shown in the other drawings. Further, the method of fixing the clip 71 to the case 50 with one touch is not particularly limited to the above.

  12 is a perspective view showing a state in which the thermistor is inserted into the insertion hole of the battery module case in the present embodiment, FIG. 13 is a perspective view in which the case is omitted from FIG. 12, and FIG. 14 is a perspective view of the thermistor in the present embodiment. FIG. 15 is a perspective view in which the case is omitted from FIG. 14, FIG. 16 is a side view of the cell unit in which the thermistor is inserted in the present embodiment, and FIGS. 17 and 18 are thermistors in the present embodiment. It is a cross-sectional perspective view of the battery module in which is inserted. In FIG. 15, the first, second and fifth spacers 41, 42 and 45 are also omitted.

  When the thermistor 70 is attached to the battery module 10, as shown in FIGS. 12 and 13, the tip of the thermistor 70 is opposed to the insertion hole 515 of the case 50, and as shown in FIGS. 14 and 15, The thermistor 70 is inserted into the case 50 through the insertion hole 515. The insertion grooves 437 and 445 of the third and fourth spacers 43 and 44 are located on the back side of the insertion hole 515 of the case 50, and as shown in FIGS. 16 to 18, the tip of the thermistor 70 is The first and second insertion grooves 437 and 445 are led to a space S defined by the second and third unit cells 30B and 30C and the third spacer 43. Thereby, since the tip of the thermistor 70 is located in the vicinity of the second and third unit cells 30B, 30C, the temperature of the unit cells 30B, 30C directly stacked can be accurately measured.

Furthermore, in this embodiment, as shown in FIGS. 17 and 18, the convex portion 435 of the third spacer 43 presses the flange 32 of the second unit cell 30B, and the flange 32 of the second unit cell 30B. And the thermistor 70 is maintained at a predetermined interval. Further, since the first insertion groove 437 of the third spacer 43 is deeper than the diameter of the thermistor 70, the flange 32 of the third unit cell 30 </ b> C is suppressed by the opening surface 438 of the first insertion groove 437. The predetermined interval is also maintained between the flange 32 of the third unit cell 30 </ b> C and the thermistor 70. For this reason, when the thermistor 70 is inserted into the battery module 10 in which the inside cannot be seen, the bending of the flange 32 by the thermistor 70 can be prevented. Temperature measurement can be ensured.

  In addition, when the vehicle is traveling, it vibrates particularly near the center in the stacking direction. Therefore, in the conventional structure, there is a risk of damaging the exterior member of the unit cell due to the vibration of both the unit cell and the thermistor. Since the unit cell 30 and the thermistor 70 are not in contact with each other, damage to the exterior member of the unit cell due to vibration can be suppressed.

  When the thermistor 70 is fully inserted, the clip 71 is fixed to the case 50 as shown in FIG. In the present embodiment, when the thermistor 70 is attached to the battery module 10, the thermistor 70 can be fixed to the case 50 with the one-touch by the clip 71, so that the number of parts can be reduced and the productivity can be improved.

  The battery module 10 in the present embodiment corresponds to an example of the assembled battery in the present invention, the single battery 30 in the present embodiment corresponds to an example of the secondary battery in the present invention, and the first insertion groove in the present embodiment. 437 corresponds to an example of the guide portion in the present invention, and the convex portion 435 and the opening surface 438 of the first insertion groove 437 in the present embodiment correspond to an example of the flange pressing portion in the present invention, and the clip 71 in the present embodiment. Corresponds to an example of the fixing means in the present invention.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Battery module 20 ... Cell unit 30A-30D ... Single cell 31 ... Exterior member 32 ... Flange 34 ... Electrode terminal 41 ... 1st spacer 42 ... 2nd spacer 43 ... 3rd spacer 435 ... Projection part 436 ... 1st 1 protrusion 437 ... 1st insertion groove
438 ... Opening surface 44 ... Fourth spacer 444 ... Second protrusion 445 ... Second insertion groove 45 ... Fifth spacer 50 ... Case 51 ... Lower case 515 ... Insertion hole 516 ... Notch 52 ... Upper case 70 ... Thermistor 71 ... Clip 72 ... Engagement claw

Claims (4)

  1. By forming a flange by laminating the outer periphery of the exterior member, the assembled battery has a plurality of secondary batteries in which the power generation element is sealed inside the exterior member, and the secondary batteries are directly stacked.
    A spacer interposed between the flanges of the adjacent secondary batteries;
    Temperature measuring means for measuring the temperature of the secondary battery;
    A fixing means for fixing the temperature measuring means to the casing of the assembled battery ,
    The spacer is to have a guide portion for inserting the temperature measuring means in the space defined by said said rechargeable battery adjacent spacer,
    The assembled battery, wherein when the temperature measuring means is fixed to the casing by the fixing means, a tip of the temperature measuring means is positioned in the space in a non-contact state with the secondary battery.
  2.     The assembled battery according to claim 1,
      The secondary battery has a positive electrode terminal and a negative electrode terminal derived from one short side of the exterior member,
      The assembled battery, wherein the spacer is interposed between the other short side portions of the exterior member in the flange.
  3. The assembled battery according to claim 1 or 2 ,
    A plurality of the spacers;
    The assembled battery, wherein the guide portion is provided in the spacer located in the center in the stacking direction of the secondary batteries among the plurality of spacers.
  4. The assembled battery according to any one of claims 1 to 3 ,
    The assembled battery according to claim 1, wherein the spacer includes a flange pressing portion for maintaining a predetermined interval between the flange and the temperature measuring means.
JP2009061357A 2009-03-13 2009-03-13 Assembled battery Active JP5434161B2 (en)

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US20180287109A1 (en) 2015-10-22 2018-10-04 Nissan Motor Co., Ltd. Battery pack

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Publication number Priority date Publication date Assignee Title
JP4506421B2 (en) * 2004-11-12 2010-07-21 トヨタ自動車株式会社 Secondary battery structure
JP4955398B2 (en) * 2004-11-30 2012-06-20 富士重工業株式会社 Electrical device assembly
WO2006067903A1 (en) * 2004-12-20 2006-06-29 Nec Corporation Device case, battery cell and assembled battery
JP4934973B2 (en) * 2005-03-10 2012-05-23 日産自動車株式会社 assembled battery
WO2006102670A1 (en) * 2005-03-24 2006-09-28 E. I. Du Pont De Nemours And Company Process to prepare stable trifluorostyrene containing compounds grafted to base polymers
JP5344932B2 (en) * 2006-03-06 2013-11-20 エルジー・ケム・リミテッド Medium or large battery module
JP4379467B2 (en) * 2006-12-11 2009-12-09 日産自動車株式会社 Battery module
JP2008235195A (en) * 2007-03-23 2008-10-02 Nissan Motor Co Ltd Battery temperature detection device and installation method of battery temperature sensor
JP4778481B2 (en) * 2007-06-07 2011-09-21 トヨタ自動車株式会社 Temperature detector mounting structure

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