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US 2016/0043429 A1 HATTA Et Al US 2016.0043429A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2016/0043429 A1 HATTA et al. (43) Pub. Date: Feb. 11, 2016 (54) BATTERY, ELECTROLYTE LAYER, Publication Classification BATTERY PACK, ELECTRONIC APPARATUS, ELECTRIC VEHICLE, POWER STORAGE DEVICE, AND ELECTRIC POWER SYSTEM (51) Int. Cl. HIM I/056 (2006.01) (71) Applicant: SONY CORPORATION, Tokyo (JP) B60L. II/IS (2006.01) H02. 7/00 (2006.01) (72) Inventors: Kazuhito HATTA, Fukushima (JP); HIM I/0525 (2006.01) Keiichi KAGAMI, Fukushima (JP); Nobuaki SHIMOSAKA, Fukushima (52) U.S. Cl. (JP); Toshitsugu ONO, Fukushima (JP); CPC ........ H0IM 10/056 (2013.01); H0IM 10/0525 Keizo KOGA, Fukushima (JP) (2013.01); B60L 11/1851 (2013.01); H02J 7/0068 (2013.01); HOIM 2300/0085 (2013.01); (73) Assignee: Sony Corporation, Tokyo (JP) HOIM 2300/0025 (2013.01); HOIM 2300/0065 (2013.01); HOIM 2.220/20 (2013.01): HOIM (21) Appl. No.: 14/777,346 2220/30 (2013.01) (22) PCT Fled: Feb. 21, 2014 (57) ABSTRACT (86) PCT NO.: PCT/UP2014/O00899 S371 (c)(1), (2) Date: Sep.15, 2015 A gel electrolyte layer is provided between a positive elec trode and a second electrode. The gel electrolyte layer is a (30) Foreign Application Priority Data layer containing particles, a resin material, and a polymer compound for retaining the resin material, and having a heat Mar. 19, 2013 (JP). - - - - - - - - - - - - - 2013-057330 capacity per unit area of 0.0001 J/Kcm or more and a heat Nov. 8, 2013 (JP) ................................. 2013-232295 capacity per unit volume of 3.0J/Kcm or less. NON AQUEOUS EEROLYTEBATTERY EXTERIOR MEMBER 60 ADHESIVEFILM 61 POSITIVE Erg LEAD 52 NEGATIVEELECTRODELEAD Patent Application Publication Feb. 11, 2016 Sheet 1 of 9 US 2016/0043429 A1 FIG. 1 NON AQUEOUS EE,ROLYTEBATTERY EXTERIOR MEMBER 60 ADHESIVE FILM 61 POSITIVE Erg LEAD 52 NEGATIVEELECTRODELEAD Patent Application Publication Feb. 11, 2016 Sheet 2 of 9 US 2016/0043429 A1 FIG. 2 50 NEGATIVE EECTROE 54. Positive EGAIEEETRO NEGATIVEELECTRODE Effio CURRENT COLLECTOR ACTIVEATERALLAYER 53 54A POSITIVEELECTRODE POSITIVEELECTRODE 56 GEECTROLYELAYER CURRENTCOLLECTOR ACTIVEMATERALAYER SEPARATOR 57 PROTECTIVETAPE Yatasara arrierreraPaez Measaas...Zayatia YS Stryer syntseny tiss AxiataEEEEEEEEEEEEEEERassessessessess e Saayaasaatata is assassia). 21 AV-22 -4-2-42. a ... Y24-2 ...aA. y -Z-A-4-4-4-4-4 AAA & ww. SS s SSt. wry Year Yfia sizzzzzzzzz) s Y y RASS...S.S.S.S.S.S.Zaara, rt ZaryanSSAS as a Yaga. SNASSa as SS g rayaaaaaaaaaaaaaaaaaaa.Sassassissi 27 rear FIG 3 Patent Application Publication Feb. 11, 2016 Sheet 3 of 9 US 2016/0043429 A1 Patent Application Publication Feb. 11, 2016 Sheet 4 of 9 US 2016/0043429 A1 FIG. 5 NON AQUEOUS gro." BATTERY A 61 ADHESIVE FILM 60 EXTERIOR MEMBER 72 NEGATIVEELECTRODELEAD ADHESIVE FILM 61 71 POSITIVEELECTRODELEAD LAMINATED 76 ELECTRODEASSEMBLY 70 NEGATIVEELECTRODE 74 76 FIXING MEMBER SEPARATOR 75 POSITIVEELECTRODE 73 B Patent Application Publication Feb. 11, 2016 Sheet 5 of 9 US 2016/0043429 A1 FIG. 6 BOTTOMCOVER 82b BATTERYPACK90 SS ...A sy' Y ressstar - s 80 BATTERY CELL 52 w 84 NOTCH PART 52 81 CIRCUITBOARD 82a TOPCOVER RECESS FIG. 7 86 85 SOFTLAMINATEFILM 50 83 HARD LAMINATEFILM Patent Application Publication Feb. 11, 2016 Sheet 6 of 9 US 2016/0043429 A1 FIG. 8 87 86 50 87 86 50 FIG. 9 (? SYYYYYYYYYYYYYYYYYYYY N 83 Patent Application Publication Feb. 11, 2016 Sheet 7 of 9 US 2016/0043429 A1 809 Patent Application Publication Feb. 11, 2016 Sheet 8 of 9 US 2016/0043429 A1 ES?OH||0 Patent Application Publication Feb. 11, 2016 Sheet 9 of 9 US 2016/0043429 A1 US 2016/0043429 A1 Feb. 11, 2016 BATTERY, ELECTROLYTE LAYER, which large energy is emitted is also rapidly increasing, and BATTERY PACK, ELECTRONIC APPARATUS, there is a strong demand for a lithium ion secondary battery ELECTRIC VEHICLE, POWER STORAGE that achieves a good balance between high reliability against DEVICE, AND ELECTRIC POWER SYSTEM Such a test and capacity improvement. 0005. In regard to this, for example, Patent Document 2 TECHNICAL FIELD Suggests dispersing local heat generation of an internal short 0001. The present technology relates to a battery. Further circuit by incorporating inorganic particles into an electro more, the present technology relates to an electrolyte layer lyte. provided between electrodes of a battery, and a battery pack, an electronic apparatus, an electric Vehicle, a power storage CITATION LIST device, and an electric power system, all of which use batter Patent Document 1CS 0006 Patent Document 1: Japanese Patent Application BACKGROUND ART Laid-Open No. 2005-353582 0002. In recent years, along with the distribution of por 0007 Patent Document 2: Japanese Patent Application table information-related electronic apparatuses such as Laid-Open No. 2011-159488 mobile telephones, video cameras, and laptop computers, improvement of performance, size reduction, and weight SUMMARY OF THE INVENTION reduction of these apparatuses have been promoted. For the power Supplies of these apparatuses, disposable primary bat Problems to be Solved by the Invention teries or secondary batteries that can be repeatedly used are 0008. When heat generation occurs in the negative elec used; however, from the viewpoint of being capable of effec trode as a whole due to an external short circuit or the like, tively achieving a comprehensive balance between enhance enormous heat is propagated to the positive electrode, and ment of performance, size reduction, weight reduction, eco thereby the positive electrode undergoes a thermal decompo nomic efficiency and the like, the demand for non-aqueous sition reaction. Thus, there is a problem of thermal runaway electrolyte batteries, particularly the demand for lithium ion of the positive electrode. For this reason, in order to prevent secondary batteries, is increasing. Furthermore, further the heat generated in the negative electrode from being trans enhancement of performance, size reduction, and the like are ferred to the positive electrode side, it is required to thermally underway in connection with these apparatuses, and there is insulate the space between the positive electrode and the also a new demand for increasing the energy density for negative electrode. non-aqueous electrolyte batteries such as lithium ion second 0009. Therefore, it is an object of the present technology to ary batteries. provide a battery having, between a positive electrode and a 0003. Thus, for the purpose of an extensive increase in the negative electrode, an electrolyte layer which absorbs the heat capacity of lithium ion secondary batteries, it has been Sug generated in an electrode and prevents the heat from being gested to use, for example, a metallic material that is alloyed transferred to the other electrode. with lithium at the time of charging as a negative electrode 0010 Furthermore, another object of the present technol active material as described in Patent Document 1 given ogy is to provide a battery pack, an electronic apparatus, an below, instead of the carbon-based negative electrode active electric Vehicle, a power storage device, and an electric power materials that have been traditionally used. Specifically, sili system, all of which use the battery. con, tin, and compounds thereof have been Suggested to be used as the metal-based negative electrode active material. Solutions to Problems For example, it is known that tin (Sn) has a high theoretical capacity (about 994 mAh/g) that highly Surpasses the theo 0011. In order to solve the problems described above, the retical capacity of graphite (about 372 mAh/g) as a negative battery of the present technology includes a positive elec electrode active material for lithium ion secondary batteries. trode, a negative electrode, and an electrolyte layer disposed 0004. On the other hand, when silicon, tin, or a compound between the positive electrode and the negative electrode, the thereof is used as a negative electrode active material, the electrolyte layer being formed from a gel-like electrolyte current density per unit area is increased, and at the same containing particles, a liquid electrolyte and a resin material time, the amount of heat generation associated with discharge for retaining the liquid electrolyte, or a solid electrolyte con tends to increase. Furthermore, in regard to the applications in taining particles, and the battery has a heat capacity per unit electric tools, electric cars and the like, there are many occa area of the electrolyte layer of 0.0001 J/Kcm or more, and a sions in which even though for a short time, heat dissipation heat capacity per unit volume of 3.0J/Kcm or less. cannot keep up with the heat generation caused by large 0012. An electrolyte layer of the present technology current discharge, and there are occasions in which a tem formed from a gel-like electrolyte containing particles, a liq perature increase in the battery cannot be avoided. Particu uid electrolyte, and a resin material for retaining the liquid larly, at the time of an external short circuit oran internal short electrolyte, or from a solid electrolyte containing particles, circuit of a battery, there is a risk that the amount of heat the electrolyte layer having a heat capacity per unit area of emitted from the negative electrode side is large, and the 0.0001 J/Kcm or more and aheat capacity per unit volume of separator film is broken by this heat, so that the short circuit 3.0J/Kcm or less. may be further extended, or the positive electrode is heated to 0013 Furthermore, the battery pack, electronic apparatus, reach a thermal decomposition temperature, and vigorous electric vehicle, power storage device, and electric power emission of heat or gas from the battery may occur. For this system of the present technology include the battery reason, the request for enhancement of reliability in a case in described above.
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