WO2020021955A1 - Batterie assemblée - Google Patents

Batterie assemblée Download PDF

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Publication number
WO2020021955A1
WO2020021955A1 PCT/JP2019/025608 JP2019025608W WO2020021955A1 WO 2020021955 A1 WO2020021955 A1 WO 2020021955A1 JP 2019025608 W JP2019025608 W JP 2019025608W WO 2020021955 A1 WO2020021955 A1 WO 2020021955A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
thermistor film
thermistor
assembled battery
unit cell
Prior art date
Application number
PCT/JP2019/025608
Other languages
English (en)
Japanese (ja)
Inventor
一市 大西
木村　雅彦
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2020021955A1 publication Critical patent/WO2020021955A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to an assembled battery in which a plurality of unit cells are arranged.
  • Patent Literature 1 describes a technique for estimating a temperature distribution using temperatures obtained from a plurality of temperature sensors and managing the temperature of each cell.
  • a temperature sensor a lead type thermistor in which a lead wire is connected to a thermistor is generally used, and is mounted outside each cell.
  • Patent Literature 2 describes a mounting structure for mounting a temperature sensor for detecting a temperature of a specific cell to an assembled battery including a plurality of cells arranged with their side surfaces facing each other.
  • the mounting structure of the temperature sensor described in Patent Literature 2 includes a sensor holding portion that holds the temperature sensor and is inserted into a gap between a cell to be detected and a cell adjacent to the cell; In the state where is inserted in the gap, the overhanging portion that is hooked on the upper surface of the cell and the sensor holding portion inserted in the gap and the side surface of the adjacent cell are arranged between the sensor holding portion and the side surface of the target cell.
  • a biasing unit that resiliently biases in the direction.
  • the temperature of the side surface of the cell can be appropriately detected because the sensor holding portion can be brought into contact with the side surface of the cell. Therefore, unlike the case where the temperature sensor is attached to the outside of the cell, the temperature between the cells constituting the battery pack can be directly measured. However, if the distance between the cells is not large enough, the mounting jig of the temperature sensor cannot be inserted, and the projection for biasing becomes a stress concentration point of the cell, so that there is a risk that the assembled battery generates heat. .
  • the present invention has been made to solve the above problem, and has as its object to provide an assembled battery including a thermistor film that can directly measure the temperature between cells and is less likely to concentrate stress.
  • the assembled battery of the present invention includes a plurality of unit cells arranged adjacent to each other and a thermistor film provided between at least one set of the unit cells and having a thickness of 1 ⁇ m or more and 10 ⁇ m or less.
  • the temperature between cells can be measured directly, and the assembled battery provided with the thermistor film in which stress does not concentrate easily can be provided.
  • FIG. 1 is an exploded perspective view schematically illustrating an example of an assembled battery according to the first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view schematically showing an example of the battery pack according to the second embodiment of the present invention.
  • FIG. 3 is an enlarged sectional view of the vicinity of the interface between the thermistor film and the base film of the battery pack shown in FIG.
  • the present invention is not limited to the following configuration, and can be appropriately modified and applied without changing the gist of the present invention. It should be noted that a combination of two or more individual desirable configurations of the present invention described below is also the present invention.
  • FIG. 1 is an exploded perspective view schematically illustrating an example of an assembled battery according to the first embodiment of the present invention.
  • the battery pack 1 shown in FIG. 1 includes a plurality of unit cells 10 arranged adjacent to each other, and a thermistor film 20 provided between the unit cells 10.
  • the plurality of cells 10 are stacked and arranged such that the main surfaces, which are the side surfaces having the largest areas, face each other.
  • the unit cell 10 includes input / output electrodes 11.
  • a comb electrode 21 is provided on the surface of the thermistor film 20.
  • An extraction electrode is provided on the comb electrode 21 and is connected to the connector 31.
  • the thermistor film 20 is provided on one surface of a base film 30 such as a polyimide film, and the other surface of the base film 30 is provided on the surface of the unit cell 10. Further, the connector 31 connected to the thermistor film 20 protrudes from the side surface of the unit cell 10 opposite to the side surface from which the input / output electrode 11 of the unit cell 10 protrudes.
  • FIG. 2 is an exploded perspective view schematically showing an example of the battery pack according to the second embodiment of the present invention.
  • the assembled battery 2 shown in FIG. 2 has the same configuration as the assembled battery 1 shown in FIG. 1 except that the thermistor film 20 is provided directly on the surface of the unit cell 10.
  • the size of the battery pack of the present invention is not particularly limited.
  • the size of the unit cell 10 is 35 mm (L 10 ) ⁇ 20 mm (W 10 )
  • the size of the thermistor film 20 is 7 mm (L 20).
  • the line / space of the comb electrode 21 is 50 ⁇ m / 50 ⁇ m.
  • the size of the base film 30 is, for example, 33 mm (L 30 ) ⁇ 15 mm (W 30 ).
  • the configuration of the unit cell is not particularly limited as long as the unit includes input / output electrodes.
  • the unit cell may be a bag-shaped unit cell including a laminate film of aluminum or the like as an outer package, or may have a thickness.
  • a case-shaped unit cell may be used.
  • a material constituting the thermistor film for example, a spinel-type oxide containing a transition metal element as a main component (for example, (Mn, Ni) 3 O 4 , (Mn, Co) 3 O 4 ) And perovskite oxides (for example, Y (Cr, Mn) O 3 , (La, Ca) (Cr, Mn) O 3 ).
  • a thermistor film functions as a temperature sensor.
  • the thermistor film is provided between the cells, the temperature between the cells can be directly measured. Therefore, high safety can be ensured, and high battery characteristics can be obtained by adjusting the output.
  • the thermistor film only needs to be provided between at least one set of unit cells, and may be provided between the outer set of unit cells, or may be located inside. It may be provided between a set of cells. Among them, the thermistor film is preferably provided between the unit cells located inside, and particularly preferably provided between all the unit cells.
  • the thermistor film may be provided on the surface of the unit cell via a base film such as a polyimide film as shown in FIG. 1, or as shown in FIG. It may be provided directly on the surface.
  • a base film such as a polyimide film as shown in FIG. 1, or as shown in FIG. It may be provided directly on the surface.
  • the thermistor film can be formed without using a base film. Therefore, the gap between the unit cells can be further reduced, and the manufacturing cost can be reduced. .
  • a film other than the polyimide film can be used as the base film as long as it is flat and flexible.
  • the base film provided with the thermistor film is preferably attached to the surface of the unit cell with an adhesive or a double-sided tape.
  • one thermistor film may be provided between adjacent unit cells, or a plurality of thermistor films may be provided.
  • the plurality of thermistor films may be arranged regularly or irregularly. For example, the temperature distribution of a unit cell can be measured by arranging a plurality of thermistor films in a matrix.
  • the thickness of the thermistor film is 1 ⁇ m or more and 10 ⁇ m or less. Therefore, unlike the case where the temperature sensor mounting structure described in Patent Document 2 is used, stress is less likely to be concentrated. As a result, the risk of the assembled battery generating heat is reduced.
  • the thickness of the thermistor film is a value measured by the following method. Using a scanning electron microscope (SEM), three sections of the thermistor film are randomly observed so that the whole in the thickness direction of the thermistor film is in one field of view. In one field of view, the thickness up to the surface of the thermistor film is measured at five points with the highest portion of the base material (such as a base film or a unit cell) on which the thermistor film is formed as a reference line. The above measurement is performed in all the visual fields, and the average value in all the measurement locations is defined as the thermistor film thickness.
  • SEM scanning electron microscope
  • the thickness of the thermistor film is preferably 2 ⁇ m or more, more preferably 3 ⁇ m or more.
  • the thickness of the thermistor film is preferably 8 ⁇ m or less, more preferably 6 ⁇ m or less.
  • unevenness of the surface of the thermistor film is 30% or less of the thickness of the thermistor film. In this case, since the surface of the thermistor film becomes flat, even if pressure is applied from the outside or the unit cell expands, the surface of the unit cell is not damaged, and the safety is enhanced.
  • the unevenness on the surface of the thermistor film is a value measured by the following method. Using a scanning electron microscope (SEM), three cross sections near the surface of the thermistor film are randomly observed at a magnification of 30 k times. In one visual field, a height difference between a convex portion and a concave portion is measured between three different adjacent convex portions. The above measurement is performed in all the visual fields, and the average value in all the measurement points is defined as the unevenness of the thermistor film surface.
  • SEM scanning electron microscope
  • the unevenness on the surface of the thermistor film is more preferably 10% or less of the thickness of the thermistor film.
  • the irregularities on the surface of the thermistor film are preferably 0.6 ⁇ m or less, more preferably 0.3 ⁇ m or less. Further, it is preferable that the unevenness on the surface of the thermistor film is 1% or more of the thickness of the thermistor film.
  • the thermistor film is preferably formed by an aerosol deposition method (AD method).
  • the AD method is a method in which fine particles are deposited on a substrate by spraying an aerosol containing the fine particles on a substrate to be formed into a film, thereby forming a film. At least a part of the fine particles that have collided with the surface of the base material bite into the surface of the base material, and are not easily separated. As a result, a dense and highly adherent film can be obtained.
  • the thermistor film when the thermistor film is formed by the AD method, the thermistor film has excellent mechanical strength and high resistance to peeling. Further, since the thermistor film formed by the AD method has flexibility, bending resistance is also increased. Therefore, by applying the thermistor film formed by the AD method to the assembled battery, it is possible to prevent the thermistor film from peeling off when the unit cell repeatedly expands and contracts. Such an assembled battery is particularly suitable for an assembled battery for in-vehicle use.
  • the thermistor film preferably has a bite of 0.02 ⁇ m or more and 2 ⁇ m or less at the interface with the substrate on which the thermistor film is formed.
  • the substrate is, for example, the base film 30 in FIG. 1 and the unit cell 10 in FIG.
  • FIG. 3 is an enlarged sectional view of the vicinity of the interface between the thermistor film and the base film of the battery pack shown in FIG.
  • the thermistor film 20 has a bite 20a at the interface with the base film 30 on which the thermistor film is formed.
  • the bite amount of the thermistor film is a value measured by the following method. Using a scanning electron microscope (SEM), three cross sections near the interface between the thermistor film and a substrate (such as a base film or a unit cell) are randomly observed at a magnification of 30 k times. In one visual field, the amount of bite of the thermistor film (the length indicated by the arrow in FIG. 3) is measured. The maximum value in all the visual fields is defined as the amount of bite of the thermistor film.
  • SEM scanning electron microscope
  • the bite amount of the thermistor film is preferably 0.1 ⁇ m or more, and more preferably 1 ⁇ m or less.
  • the connector connected to the thermistor film protrudes from a side surface of the unit cell different from a side surface from which the input / output electrodes of the unit cell protrude. In this case, it is possible to prevent the influence of electromagnetic noise or the like due to the input / output of the battery, and to reduce the risk of short circuit.
  • the connector 31 connected to the thermistor film 20 protrudes from the side of the unit cell 10 opposite to the side from which the input / output electrode 11 of the unit cell 10 protrudes.
  • the side surface of the cell 10 is different from the side surface from which the input / output electrode 11 protrudes, the side surface may protrude from another side surface.
  • the connector connected to the thermistor film may protrude from the side of the cell different from the side from which the input / output electrodes of the cell protrude. preferable.
  • the input / output electrodes 11 protrude from the same side surface of the unit cell 10, but may protrude from different side surfaces.
  • the battery pack of the present invention is preferably manufactured as follows.
  • a comb-tooth electrode 21 made of Ag is formed on the thermistor film 20 by printing.
  • the comb-tooth electrode 21 is provided with an extraction electrode, and is connected to a connector 31 projecting from a side surface of the unit cell 10 different from the side surface on which the input / output electrode 11 is provided.
  • These electrodes serve as electrodes for temperature measurement, are bundled together, and can be easily connected to an external circuit. Thereafter, the cells 10 are brought into close contact with each other. Thus, the assembled battery 1 shown in FIG. 1 is obtained.
  • the assembled battery 2 shown in FIG. 2 is obtained.
  • the assembled battery of the present invention is not limited to the above embodiment, and various applications and modifications can be made within the scope of the present invention with respect to the configuration, manufacturing conditions, and the like of the assembled battery.
  • the method for forming the thermistor film is not limited to the AD method, but may be a sputtering method or the like.
  • each electrode is not limited to the above.
  • a comb-shaped electrode is used, but a simple-shaped electrode may be provided on the front and back surfaces of the thermistor film, and the temperature may be measured by measuring a resistance value therebetween.
  • a plurality of electrode pairs may be provided. By providing a plurality of electrode pairs, it is possible to measure the temperature more finely in the horizontal direction of the unit cell surface.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne une batterie assemblée comprenant : de multiples batteries unitaires disposées adjacentes les unes aux autres ; et un film de thermistance disposé entre au moins un ensemble des batteries unitaires et ayant une épaisseur de 1 µm à 10 µm.
PCT/JP2019/025608 2018-07-24 2019-06-27 Batterie assemblée WO2020021955A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018138594 2018-07-24
JP2018-138594 2018-07-24

Publications (1)

Publication Number Publication Date
WO2020021955A1 true WO2020021955A1 (fr) 2020-01-30

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ID=69181001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/025608 WO2020021955A1 (fr) 2018-07-24 2019-06-27 Batterie assemblée

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Country Link
WO (1) WO2020021955A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093572A1 (fr) * 2011-01-07 2012-07-12 株式会社村田製作所 Capteur de température et structure à laquelle le capteur de température est fixé
JP2017084647A (ja) * 2015-10-29 2017-05-18 パナソニックＩｐマネジメント株式会社 電池システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093572A1 (fr) * 2011-01-07 2012-07-12 株式会社村田製作所 Capteur de température et structure à laquelle le capteur de température est fixé
JP2017084647A (ja) * 2015-10-29 2017-05-18 パナソニックＩｐマネジメント株式会社 電池システム

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