WO2014022908A1 - Borne de cellule de batterie composée d'une pluralité de matériaux et cellule de batterie et bloc-batterie l'utilisant - Google Patents

Borne de cellule de batterie composée d'une pluralité de matériaux et cellule de batterie et bloc-batterie l'utilisant Download PDF

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Publication number
WO2014022908A1
WO2014022908A1 PCT/CA2013/000683 CA2013000683W WO2014022908A1 WO 2014022908 A1 WO2014022908 A1 WO 2014022908A1 CA 2013000683 W CA2013000683 W CA 2013000683W WO 2014022908 A1 WO2014022908 A1 WO 2014022908A1
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WO
WIPO (PCT)
Prior art keywords
anode
cathode terminals
cathode
terminal
distal portion
Prior art date
Application number
PCT/CA2013/000683
Other languages
English (en)
Inventor
Seungwoo Chu
Jean-Yves St. Gelais
Original Assignee
Mahy E Cell Partnership
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 Mahy E Cell Partnership filed Critical Mahy E Cell Partnership
Publication of WO2014022908A1 publication Critical patent/WO2014022908A1/fr

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Classifications

    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • 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
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • 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
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular 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 disclosure relates to the field of battery cell terminals, and more specifically, to battery cell terminals for use in battery cells of electric vehicles.
  • Lithium-ion battery cells in battery packs typically include terminals that are made from different materials (such as aluminum and copper). This may lead to difficulty in joining the terminals to bus bars and the like in the battery pack since the bus bars may be made from a material that differs from at least one of the two terminals. In particular, it may be difficult to join a copper component to an aluminum component and the resulting connection may sometimes have poor mechanical strength, poor electrical conductivity, and may experience galvanic corrosion in some instances. Additionally, it would be advantageous to use lighter weight materials in battery packs so as to reduce their sometimes considerable weight particularly in automotive applications.
  • a terminal assembly which includes a terminal and a sealing tape.
  • the terminal has a first portion and a second portion.
  • the second portion is made from a selected material that is different than a material from which the first portion is made.
  • the first and second portions are separated from each other by a transition region.
  • the sealing tape surrounds the terminal and sealingly covers at least a portion of the transitional region. Only material from the first portion of the terminal extends from a first end of the sealing tape.
  • a battery cell including a stack that contains at least one anode, at least one cathode, and at least one separator, a housing having a cavity that houses the stack and an electrolyte, an anode terminal electrically connected to the at least one anode and extending outwardly from the housing, and a cathode terminal electrically connected to the at least one cathode and extending outwardly from the housing.
  • Each of the anode and cathode terminals has a proximal portion that is exposed to the electrolyte and a distal portion that is exposed to atmospheric gas outside the housing and that is not exposed to the electrolyte.
  • the distal portion of one of the anode and cathode terminals is made from a selected material that is different than a material from which the proximal portion of the one of the anode and cathode terminals is made.
  • a battery pack includes a plurality of battery cells and a plurality of internal electrical conduits.
  • Each battery cell includes a stack including at least one anode, at least one cathode, and at least one separator, a housing having a cavity, wherein the stack and an electrolyte are contained in the cavity, an anode terminal electrically connected to the at least one anode and extending outwardly from the housing, and a cathode terminal electrically connected to the at least one cathode and extending outwardly from the housing.
  • Each of the anode and cathode terminals has a proximal portion that is exposed to the electrolyte and a distal portion that is exposed to atmospheric gas outside the housing and that is not exposed to the electrolyte.
  • the distal portion of one of the anode and cathode terminals is made from a selected material that is different than a material from which the proximal portion of the one of the anode and cathode terminals is made.
  • Each internal electrical conduit provides a connection between the cathode terminal from one of the battery cells to the anode terminal from another one of the battery cells.
  • FIG. 1a is a plan view of an example of a battery pack
  • FIG. 1b is a plan view of an example of a battery module that is part of the battery pack shown in FIG. 1a;
  • FIG. 2a is a plan view of one of the battery cells in the battery module shown in FIG. 1b; [0011] FIG. 2b is a cross sectional view of the battery cell shown in FIG. 2a;
  • FIG. 2c is a cross sectional view of the stack shown in FIG. 2b;
  • FIG. 3 is a plan view of the battery cell shown in FIG. 2a with a portion of a housing for the battery cell removed;
  • FIGS. 4a, 4b and 4c are cross sectional side views showing different possible placements of a sealing tape on one of the terminals of the battery cell shown in FIG. 2a;
  • FIG. 5a is a table that shows a relationship between the resistivity of the terminal shown in FIG. 4a and the makeup of the terminal.
  • FIG. 5b is a table that shows a relationship between the raw material cost of the terminal shown in FIG. 4a and the makeup of the terminal.
  • FIG. 1a shows an example of a battery pack
  • the battery pack 10 includes a housing 11, a plurality of battery cells 12 (see FIG. 1b), which may be arranged into modules 74 (see FIGS. 1a and 1b) within the housing
  • Each battery cell 12 may be configured as shown in FIGS. 2a and 2b.
  • Each battery cell 12 includes a stack 20, a housing 22 having a cavity 24, and anode and cathode terminals 26 and 28.
  • the housing 22 may be a pouch-type housing, which is formed from a first film 30 and a second film 32 which mate together along their respective peripheries to form a peripheral seal region 34.
  • the first and second films 30 and 32 are each made from a plurality of layers, including an inner layer 36 and an outer layer 38.
  • the inner layer 36 along the periphery of the first film 30 is thermally joined to the inner layer 36 along the periphery of the second film 32 to form the peripheral seal region 34 of the housing 22.
  • the inner layer 36 may be made from any suitable material such as polypropylene.
  • the outer layer 38 may itself comprise a plurality of layers including a main barrier layer, a secondary barrier layer, and a mechanical protection layer, which are not shown individually in FIG. 2b.
  • the outer layer 38 may alternatively have any other suitable makeup.
  • the outer layer 38 substantially prevents the passage of oxygen and moisture therethrough from outside the battery cell 12 into the cavity 24, and provides mechanical protection against a breach of the first or second film 30, 32 from mechanical damage.
  • the stack 20 is positioned in the cavity 24 along with a quantity of electrolyte 40.
  • the stack 20 includes a plurality of anodes 42 alternating with a plurality of cathodes 44.
  • a separator 46 is positioned between each anode 42 and each cathode 44.
  • the separator 46 is electrically insulative between 709517PRO periphery of the second film 32 to form the peripheral seal region 34 of the housing 22.
  • the inner layer 36 may be made from any suitable material such as polypropylene.
  • the outer layer 38 may itself comprise a plurality of layers including a main barrier layer, a secondary barrier layer and a mechanical protection layer, which are not shown individually in Figure 2b.
  • the outer layer 38 may alternatively have any other suitable makeup.
  • the outer layer 38 substantially prevents the passage of oxygen and moisture therethrough from outside the battery cell 12 into the cavity 24, and provides mechanical protection against a breach of the first or second film 30 or 32 from mechanical damage.
  • the stack 20 is positioned in the cavity 24 along with a quantity of electrolyte 40.
  • the stack 20 includes a plurality of anodes 42 alternating with a plurality of cathodes 4 « .
  • a separator 46 is positioned between each anode 42 and each cathode 44.
  • the separator 46 is electrically insulative between each anode 42 and cathode 44 but permits the passage of Li ions in the electrolyte 40 therethrough, so as to permit Li ion intercalation or de-intercalation to take place between the anode 42 and cathode 44.
  • the stack 20 may have any other suitable arrangement of anodes 42 and cathodes 44 that permits a suitable Li ion intercalation or de-intercalation to occur.
  • the anode 42 may be a sheet made from two layers of graphite (such as natural graphite or artificial graphite supplied by Osaka Gas, Japan, or by Timcal, Switzerland) that sandwich a copper foil electrode.
  • graphite such as natural graphite or artificial graphite supplied by Osaka Gas, Japan, or by Timcal, Switzerland
  • Other anode materials may also be employed such
  • the electrolyte 40 may contain carbonates, organic solvent and lithium hexafluorophophate or some other suitable lithium salt.
  • Other chemistries e.g., non- Lithium based chemistries
  • non- Lithium based chemistries may alternatively be provided however.
  • the stack 20 While a plurality of anodes 42 and a plurality of cathodes 44 are shown in FIG. 2c, it is possible for the stack 20 to include as few as one anode 42, one cathode 44, and one separator 46 therebetween.
  • the stack 20 may include an outer wrap 48, which facilitates handling of the stack 20 prior to insertion into the cavity 24.
  • Each of the anode and cathode terminals 26, 28 has a proximal portion 52 (which may be referred to as a first portion) and a distal portion 54 (which may be referred to as a second portion).
  • the proximal portion 52 is exposed to the electrolyte 40.
  • the proximal portion 52 of the cathode terminal 28 is electrically connected to the plurality of cathodes 44 via electrical conduits 56, which may be extensions of the cathodes 44, and which are all welded to the proximal portion 52.
  • the joint between one of the electrical conduits 56 and the proximal portion 52 of the cathode terminal 28 is represented in FIG. 3 by reference character 57. It will be noted that in FIG.
  • a sealing tape 58 may be wrapped around each of the portions of the anode and cathode terminals 26 and 28 that pass through the peripheral seal region 34 of the housing 22.
  • the sealing tape 58 may include an inner layer 60 that is made from a material that is selected to join sealingly to the cathode terminal 28 and an outer layer 62 that is made from a material selected to join sealingly to the inner layer 36 of the films 30, 32 of the housing 22.
  • the inner and outer layers 60, 62 may be made from any suitable materials.
  • the inner layer 60 may be made from a suitable adhesive polymer. Portions of the anode terminal 26 (or the cathode terminal 28) covered by the sealing tape 58 are not exposed to oxygen, moisture, or electrolyte to therefore prevent or reduce any galvanic reaction.
  • the outer layer 62 may, for example, be made from the same material as the inner layer 36 of the first and second films 30, 32 (e.g., polypropylene).
  • the terminals 26, 28 may be provided to a battery cell manufacturer in the form of terminal assemblies that include the terminals 26, 28 with the sealing tape 58 already wrapped around them.
  • the first and second films 30, 32 of the housing 22 may be joined to the outer layer 62 of the sealing tape 58 thermally (i.e., by heating one or both of the outer layer 62 and the inner layers 36 so as to partially melt the inner layers 36 of the first and second films 30, 32 and the outer layer 62 of the sealing tape 58).
  • the material of the inner layer 60 of the sealing tape 58 may be selected to have a melting temperature that is higher than that of the material of the outer layer 62, or alternatively stated, the material of the outer layer 62 may be selected to have a melting temperature that is lower than that of the material of the inner layer 60.
  • a suitable sealing tape 58 may be provided by Sumitomo ChemicalTM of Tokyo and Osaka, Japan.
  • the sealing tape 58 provides a means for ensuring that a seal is formed between the housing 22 of the battery cell 12 and the terminals 26, 28 where the terminals 26, 28 pass through the housing 22 so as prevent any leakage of electrolyte 40 therepast out of the housing 22.
  • a suitable material for the proximal portion 52 of the cathode terminal 28 is a material that will conduct an electric current from the cathodes 44 without incurring galvanic corrosion with the cathodes 44.
  • a suitable material for the proximal portion 52 may be aluminum in embodiments wherein the cathodes 44 are aluminum-based.
  • a suitable material for the remainder of the cathode terminal 28, including the distal portion 54, may also be aluminum.
  • the entirety of the cathode terminal 28 may be made from a single material, such as aluminum.
  • the proximal portion 52 of the anode terminal 26 is electrically connected to the plurality of anodes 42 via electrical conduits 64, which may be extensions of the anodes 42 which are all welded to the proximal portion 52.
  • the joint between one of the electrical conduits 64 and the proximal portion 52 of the anode terminal 26 is represented in FIG. 3 by reference character 65.
  • a suitable material for the proximal portion 52 of the anode terminal 26 is a material that will conduct an electric current to the anodes 42 without incurring galvanic corrosion with the anodes 42.
  • a suitable material for the proximal portion 52 may be copper in embodiments wherein the anodes 42 are copper-based.
  • the distal portion 54 of the anode terminal 26 may be made from a different material than the material of the proximal portion 52.
  • the distal portion 54 of the anode terminal 26 may be made from aluminum.
  • each internal electrical conduit 14 extends between the cathode terminal 28 of each battery cell 12 to the anode terminal 26 of each subsequent battery cell 12, so that all the cells 12 are connected in series.
  • selecting a material for the internal electrical conduits can be difficult since they connect to two different materials (e.g., aluminum and copper).
  • these internal electrical conduits have been made from copper, however joining a copper internal electrical conduit with an aluminum terminal on a battery cell can be difficult.
  • nickel-plated copper has been used for the anode terminal so as to improve its weldability to components internal to the cell (e.g., the anodes) and components external to the cell (e.g., the internal electrical conduits).
  • the portion of the terminal that is outside of the housing and is exposed to atmospheric gas (e.g., air) and moisture would not suffer from oxidation.
  • nickel-plated copper can be relatively expensive and can increase the electrical resistance associated with the cell 12.
  • the internal electrical conduits 14 may be made from aluminum and may be joined relatively easily with the terminals 26, 28.
  • the external cathode and anode conduits 16, 18 may also be made from aluminum.
  • a savings in weight may be achieved as compared to cells where the internal electrical conduits are made of copper (e.g., nickel-plated copper).
  • a transition region between the proximal and distal portions 52, 54 is indicated by reference character 66.
  • the transition region 66 is a region that contains some amount of the material from the distal portion 54 mixed with an amount of the material of the proximal portion 52.
  • a third material (which may be referred to as a transition material) is provided in the transition region 66 to assist in the joining of the material of the distal portion 54 to the material of the proximal portion 52.
  • the transition material may, for example, be nickel, which has been found to join well to both copper and aluminum.
  • the length of the transition region 66 is indicated by reference character L in FIG. 4a.
  • the transition region 66 may have any suitable length L. Some considerations that may be made when selecting a length L for the transition region 66, particularly when a third transition material is provided in the transition region 66, may include the overall cost of the anode terminal 26 and the overall resistivity or conductivity of the anode terminal 26.
  • the table shown in FIG. 5a shows how varying the length L of the transition region 66 affects the overall resistivity of the anode terminal 26 in an embodiment wherein the distal portion 54 is made from aluminum, the proximal portion 52 is made from copper and the transition material is nickel.
  • the column with the header "Cu" shows the length of the proximal portion 52.
  • the column with the header " ⁇ shows the length of the distal portion 54.
  • the column with the header "Ni" shows the length L of the transition region 66. It will be noted that the resistivity of nickel is higher than that of aluminum and that of copper. Accordingly, from the perspective of optimizing resistivity, it is desirable to keep the length L of the transition region 66 relatively short since the resistivity of the terminal 26 increases as the length L of the transition region 66 increases.
  • the table shown in FIG. 5b shows how varying the length L of the transition region 66 affects the cost of the anode terminal 26 (in terms of raw material costs) in an embodiment wherein the distal portion 54 is made from aluminum, the proximal portion 52 is made from copper, and the transition material is nickel. As can be seen, the cost for nickel is higher than the cost for both aluminum and copper. As a result, from the perspective of reducing cost, it is again desirable to keep the length L of the transition region 66 relatively short since the raw material cost associated with the terminal 26 increases as the length L of the transition region 66 increases.
  • a length L that is too short can reduce the strength of the joint provided by the transition region 66 between the proximal and distal portions 52, 54.
  • a length L that is too long can increase the cost of the anode terminal 26 unnecessarily and/or can result in increased resistivity for the anode terminal 26.
  • a length L of about 3 mm has been found to be suitable, however, a length L in the range of between about 0.5 mm to about 6 mm may be acceptable in some embodiments depending on factors such as the materials involved, etc.
  • the terminal 26 may include some amount of nickel (i.e., in the transition region 66), which is more expensive than copper, using aluminum for the distal portion 54 more than offsets the increased cost of nickel, resulting in a lower overall raw material cost for the terminal 26 than would be had if the terminal 26 were made solely from copper.
  • the raw material cost for using only copper for the terminal 26 is shown in the first line as being $3.50 (per pound).
  • the raw material cost for having a transition region 66 of 3 mm containing nickel, a distal portion 54 of 27 mm of aluminum, and a proximal portion 52 of 24 mm of copper is $2.50 (per pound).
  • the particular length L selected for the transition region 66 may vary depending on the specific dimensions of the terminal.
  • the sealing tape 58 may be positioned so that it surrounds the anode terminal 26 and sealingly covers the entire transition region 66 between the distal portion 54 and the proximal portion 52 so that only the material of the distal portion 54 extends from an outward end (shown by reference character 68) of the sealing tape 58 and is exposed to atmospheric gas outside the cell 12 (and therefore the proximal portion 52 is not exposed to atmospheric gas outside the cell 12), and only the material of the proximal portion 52 extends from an inward end (shown by reference character 70) of the sealing tape 58 and is exposed to electrolyte 40 inside the housing 22 (and therefore the distal portion 54 is not exposed to electrolyte 40.
  • the inward and outward ends 70, 68 of the sealing tape 58 may also be referred to as first and second ends 70, 68 of the sealing tape 58.
  • the sealing tape 58 it is possible for the sealing tape 58 to cover only part of the transition region 66 instead of covering the entirety of the transition region 66 while still providing acceptable performance and longevity for the battery cell 12.
  • the outward end (shown by reference character 72) of the transition region 66 is not covered by the sealing tape 58 and thus some portion of the transition region 66 is exposed to atmospheric gas outside the cell 12.
  • the sealing tape 58 is still positioned so that only the material of the proximal portion 52 of the anode terminal 26 extends from the inward end 70 of the sealing tape 58.
  • some oxidation may occur of that material (e.g., copper).
  • some galvanic corrosion may occur resulting from a galvanic reaction between that material and the material of the distal portion 54 (e.g., aluminum) over time, when exposed, for example, to moisture.
  • the amount of galvanic corrosion and/or oxidation that occurs may be sufficiently small and/or sufficiently slow that battery cell performance and longevity may still be acceptable.
  • transition region 66 As shown in FIGS. 4a and 4b, in embodiments where the transition region 66 is covered completely by the sealing tape 58, the transition region 66 need not be centered between the outward and inward ends 68, 70 of the sealing tape 58.
  • the seal region 34 of the housing 22 need not be centered over the transition region 66, and need not even overlap the transition region 66 at all. Furthermore, the seal region 34 need not be centered over the sealing tape 58. [0043] Referring to FIGS. 1a-1b, the cells 12 may be arranged into modules 74 of four cells 12. Within each module 74, the cathode terminal 28 of each cell 12 is connected to the anode terminal 26 of the subsequent cell 12 via a first type 14a of internal electrical conduit 14, which may be a solid conductor.
  • the anode terminal 26 of the first cell 12 in a module 74 and the cathode terminal 28 of the last cell 12 in a module 74 may each have another type 14b of internal electrical conduit 14 connected thereto, which may be, for example, a large solid conductor.
  • a third type 14c of internal electrical conduit 14 (e.g., another solid conductor) may connect between the large solid conductor 14b on the cathode terminal 28 on the last cell 12 of one module 74 and the large solid conductor 14b on the anode terminal 26 on the first cell 12 of the subsequent module 74.
  • each electrical conduit 14b, 14c is not shown to directly connect a cathode terminal 28 from one of the cells 12 and an anode terminal 26 of another of the cells 12, each electrical conduit 14b, 14c may be said to connect between a cathode terminal 28 of one of the cells 12 and an anode terminal 26 of another of the cells 12 because each is at least part of the chain that carries current from the cathode terminal 28 of one of the cells 12 and the anode terminal 26 of another of the cells 12.
  • each cell 12 may be capable of generating a nominal 3.6 V. Each module may thus generate 14.4 V.
  • the battery pack 10 may contain any suitable number of modules 74, such as, for example, 23 modules arranged in series.
  • all of the internal electrical conduits 14 may be made from aluminum. It will be noted that aluminum has a slightly lower conductivity than copper. As a result, an electrical conduit (such as the conduits 14) made from aluminum would have to have a larger cross sectional area than one made from copper with a similar conductance.
  • the conduits 14 out of aluminum instead of copper makes them lighter, due to the significantly lower density of aluminum relative to copper.
  • the electrical conduits 14 made from aluminum would have to be larger than equivalent ones made from copper, the aluminum ones are lighter.
  • the conductance of the electrical conduits 14 is dependent in part on the conductivity of the material from which the conduits 14 are made.
  • the ratio of the density of the first material to the density of the second material is less than the ratio of the conductivity of the first material to the conductivity of the second material.
  • the density of aluminum is in the range of about 3.95 g/cc to about 4.1 g/cc.
  • the density of copper is about 8.94 g/cc.
  • the conductivity of aluminum is about 3.5 x 10 ⁇ 7 S/m.
  • the conductivity of copper is about 6.0 x 10 ⁇ 7 S/m.
  • the ratio of the densities of aluminum to copper is about 0.44-0.45.
  • the ratio of the conductivities of aluminum to copper is about 0.58.
  • the cost for aluminum is generally less than that of copper, and particularly nickel plated copper.
  • a cost savings may be realized relative to using copper conduits.
  • Another advantage to making the distal portions 54 of the anode and cathode terminals 26, 28 out of the same material is that the setup to weld each terminal to an end of an electrical conduit is the same, using the same welding tools and process parameters. This may simplify the manufacture of the battery pack 10 relative to a battery pack made with cells having terminals made from different materials and which may utilize very different welding tools and process parameters in the welding process.
  • the anode terminal 26 may have a distal portion 54 that is made from a different material than the material of the proximal portion 52, and for the cathode terminal 28 to have distal and proximal portions 54, 52 that are made of the same material as each other
  • a cell it is alternatively possible for a cell to have a cathode terminal which has a distal portion that is made from a different material than the material of the proximal portion, and to have an anode terminal which has distal and proximal portions that are made of the same material as each other.
  • Another alternative is for both the anode and cathode terminals to have distal portions made from materials that are different than the materials of the proximal portions.
  • distal portion of one of the anode and cathode terminals being made from a selected material that is different than a material from which the proximal portion of said one of the anode and cathode terminals is made, it will be understood that this does not preclude the distal portion of the other of the anode and cathode terminals also being made from a material that is different than a material from which the proximal portion of the other of the anode and cathode terminals is made.
  • a battery cell terminal having a distal portion made from one material and a proximal portion made from another material may result in improvements such as reduced weight for the battery cell and the battery pack, improved joints between the cell terminals and the electrical conduits that connect to them, improved manufacturing, and potentially reduced costs
  • the selection of materials for the distal and proximal portions of a cell terminal may be made based on any other suitable considerations including, for example, conductivity.

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  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une cellule de batterie comprenant un empilement qui contient au moins une anode et au moins une cathode, un boîtier, une borne d'anode connectée électriquement à ladite anode et s'étendant vers l'extérieur à partir du boîtier, et une borne de cathode connectée électriquement à ladite cathode et s'étendant vers l'extérieur à partir du boîtier. Chacune des bornes d'anode et de cathode possède une partie proximale qui est exposée à un électrolyte et une partie distale exposée à un gaz atmosphérique à l'extérieur du boîtier et qui n'est pas exposée à l'électrolyte. La partie distale de l'une des bornes d'anode et de cathode est composée d'un matériau choisi qui est différent d'un matériau à partir duquel est composée la partie proximale de l'une des bornes d'anode et de cathode. Les parties distale et proximale sont séparées l'une de l'autre par une région de transition.
PCT/CA2013/000683 2012-08-10 2013-08-01 Borne de cellule de batterie composée d'une pluralité de matériaux et cellule de batterie et bloc-batterie l'utilisant WO2014022908A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261681766P 2012-08-10 2012-08-10
US61/681,766 2012-08-10

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WO2014022908A1 true WO2014022908A1 (fr) 2014-02-13

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PCT/CA2013/000683 WO2014022908A1 (fr) 2012-08-10 2013-08-01 Borne de cellule de batterie composée d'une pluralité de matériaux et cellule de batterie et bloc-batterie l'utilisant

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781414A (en) * 1952-07-03 1957-02-12 Elgin Nat Watch Co Electrical energy producing cells and method of making the same
US20040001999A1 (en) * 2002-06-26 2004-01-01 Nissan Motor Co., Ltd. Thin Battery
US20050014036A1 (en) * 2003-06-24 2005-01-20 Samsung Sdi Co., Ltd. Pouched lithium secondary battery
US20060269840A1 (en) * 2005-05-19 2006-11-30 Nissan Motor Co., Ltd. Secondary battery
EP1737057A1 (fr) * 2004-03-31 2006-12-27 NEC Lamilion Energy, Ltd. Cellule de type lamine, borne de jonction, ensemble de batterie et procede de production d"un ensemble de batterie
US20110081569A1 (en) * 2009-10-05 2011-04-07 Sung-Bae Kim Battery module

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781414A (en) * 1952-07-03 1957-02-12 Elgin Nat Watch Co Electrical energy producing cells and method of making the same
US20040001999A1 (en) * 2002-06-26 2004-01-01 Nissan Motor Co., Ltd. Thin Battery
US20050014036A1 (en) * 2003-06-24 2005-01-20 Samsung Sdi Co., Ltd. Pouched lithium secondary battery
EP1737057A1 (fr) * 2004-03-31 2006-12-27 NEC Lamilion Energy, Ltd. Cellule de type lamine, borne de jonction, ensemble de batterie et procede de production d"un ensemble de batterie
US20060269840A1 (en) * 2005-05-19 2006-11-30 Nissan Motor Co., Ltd. Secondary battery
US20110081569A1 (en) * 2009-10-05 2011-04-07 Sung-Bae Kim Battery module

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