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WO2017150052A1 - Module de cellule au lithium-ion - Google Patents

Module de cellule au lithium-ion Download PDF

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Publication number
WO2017150052A1
WO2017150052A1 PCT/JP2017/003509 JP2017003509W WO2017150052A1 WO 2017150052 A1 WO2017150052 A1 WO 2017150052A1 JP 2017003509 W JP2017003509 W JP 2017003509W WO 2017150052 A1 WO2017150052 A1 WO 2017150052A1
Authority
WO
WIPO (PCT)
Prior art keywords
short
battery
positive electrode
negative electrode
circuit member
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2017/003509
Other languages
English (en)
Japanese (ja)
Inventor
修 久保田
啓 坂部
鈴木　修一
明徳 多田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Publication of WO2017150052A1 publication Critical patent/WO2017150052A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • 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
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • 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
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 a lithium ion battery module.
  • Lithium ion batteries may become excessively hot due to overcharging, heating, etc. In such a high temperature state, the instability of the electrode active material and the electrolyte during charging increases, so that the possibility of ignition and the like increases as the charge amount increases.
  • lithium ion battery modules (assembled batteries) in which a plurality of lithium ions are connected are being developed as power for electric vehicles and the like.
  • damage caused when ignition occurs is further increased as compared with the secondary battery 3, and thus means for reducing the charge amount of a high-temperature lithium ion battery intended for the assembled battery is required.
  • Patent Document 1 as a means for reducing the charge amount of a lithium ion battery constituting an assembled battery, a configuration in which a short circuit is formed by bringing bus bars that electrically connect positive and negative terminals of adjacent batteries into contact with each other Is disclosed.
  • the present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide a structure that prevents excessive temperature rise of the assembled battery by operating by temperature rise without requiring external pressure or deformation of the battery. It is to provide.
  • Means for solving the problems of the present invention are, for example, as follows.
  • a plurality of secondary batteries having a battery container having a pair of wide surfaces and two sets of narrow surfaces facing each other, and a positive electrode terminal and a negative electrode terminal provided on either of the narrow surfaces;
  • the plurality of secondary batteries are stacked so that the wide surfaces are opposed to each other, and the plurality of secondary batteries are adjacent to each other so that the secondary batteries are connected in series, the positive terminal and the negative terminal are
  • a set of adjacent secondary batteries connected by a bus bar has two sets of the positive electrode terminal and the negative electrode terminal arranged facing each other in the stacking direction, and the one set of the positive electrode terminal and the negative electrode terminal is A positive electrode charging portion that is connected by the bus bar and includes the positive electrode terminal of the other one set and the bus bar provided on the positive electrode terminal of the other one set, and the negative electrode terminal of the other set and the other one set.
  • the bus bar provided on the negative terminal In the assembled battery that is not electrically connected to the polar charging unit, the secondary battery is a short-circuit member that energizes between the positive electrode charging unit and the negative electrode charging unit in accordance with an increase in temperature of the secondary battery.
  • FIG. 6 is an external perspective view of a short-circuit member 2 of Example 2.
  • External view of assembled battery 1 having short-circuit member 2 of Example 2 FIG. 6 is an external perspective view of a short-circuit member 2 of Example 3.
  • FIG. 1 is an external perspective view of an assembled battery of Example 1 of the present invention.
  • the assembled battery 1 has a battery stack 4 in which a plurality of secondary batteries 3 are stacked and an integrated mechanism 5 that integrates the battery stack.
  • the battery stack 4 includes a plurality of secondary batteries 3 and a plurality of battery holders 14 provided between the secondary batteries 3.
  • each secondary battery 3 is a flat rectangular prismatic secondary battery having a pair of wide surfaces and two sets of narrow surfaces (one set of two sets of narrow surfaces is a battery lid). And battery bottom).
  • the plurality of secondary batteries 3 constituting the battery stack are stacked so that the wide surface sides of the adjacent secondary batteries 3 face each other.
  • Adjacent secondary batteries 3 are arranged with their directions reversed so that the positions of the positive terminal and the negative terminal provided on the battery lid are reversed.
  • the positive electrode terminal and negative electrode terminal of each adjacent secondary battery 3 are electrically connected by a bus bar 6 ⁇ / b> A that is a metal plate-like conductive member.
  • the plurality of secondary batteries 3 constituting the assembled battery according to the present embodiment are electrically connected in series.
  • the terminal bus bar 6B is provided in the battery of the both ends of a battery laminated body, and a terminal bus bar is used in order to charge / discharge the whole assembled battery.
  • the battery stack 4 is held by the integration mechanism 5.
  • the integration mechanism 5 includes a pair of end plates 12 positioned on both ends in the stacking direction of the secondary battery 3 and a pair of side frames 13 positioned on the side surfaces in the stacking direction. A plurality of secondary batteries 3 arranged in a stacked manner are secured.
  • the end plate 12 has a rectangular flat plate shape and is formed to have approximately the same size as the secondary battery 3. The pair of end plates sandwich the battery stack 4 from the stacking direction.
  • the material of the end plate is a metal such as aluminum or aluminum alloy.
  • the pair of side frames 13 are located on the side surface side of the battery stack, and are arranged symmetrically on the left side and the right side.
  • the side frame 13 includes a side plate in which a rectangular flat plate is provided with a rectangular opening 13A, and a bent portion 13B that is bent 90 degrees in the same direction at both front and rear ends of the side plate. It has.
  • the side plates extend in parallel with each other between the pair of side surface abutting portions extending in parallel with each other between the front end plate and the rear end plate, and between the upper end and the lower end of the battery stack. It has a pair of existing engaging portions and has a substantially square shape when viewed from the left-right direction.
  • the side frame 13 is manufactured by cutting a metal plate such as a stainless steel plate or a steel plate having a predetermined thickness into a predetermined width, punching the center into a rectangle, and bending the end portion.
  • the plurality of secondary batteries 3 are stacked in the front-rear direction via the battery holder 14 to hold the battery stack.
  • the material of the battery holder is a resin having insulating properties and heat resistance, such as engineering plastics such as polybutylene terephthalate (PBT) and polycarbonate (PC), rubber, and the like.
  • the battery holder includes an intermediate holder 14A disposed between the adjacent secondary batteries 3, a secondary battery 3 disposed at the front end and the end plate, and a secondary battery 3 disposed at the rear end and the end. It consists of the end holder 14B arrange
  • FIG. 2 is a diagram showing the secondary battery 3.
  • the secondary battery 3 includes a rectangular battery container including a battery can 7 and a battery lid 8.
  • the material of the battery can and the battery lid is, for example, aluminum or an aluminum alloy.
  • the battery can 7 has a rectangular box shape having an opening at one end.
  • the battery lid 8 has a rectangular flat plate shape and is laser-welded so as to close the opening of the battery can 7.
  • the battery lid 8 seals the battery can 7.
  • a rectangular battery container composed of a battery lid and a battery can has a hollow rectangular parallelepiped shape.
  • a pair of wide side plates having the largest surface (wide surface 7A) among the side surfaces constituting the battery case are opposed to each other, and the surface having the smallest area (narrow among the side surfaces constituting the battery case).
  • a pair of narrow side plates having side surfaces 7B) are opposed to each other, and the battery lid and the bottom plate of the battery can are opposed to each other.
  • the secondary battery 3 has a positive terminal and a negative terminal on one side.
  • the battery lid 8 is provided with a positive electrode terminal 9A and a negative electrode terminal 9B.
  • a charge / discharge element in which a positive electrode and a negative electrode are stacked is housed in a state covered with an insulating case.
  • the positive electrode is connected to the positive electrode terminal 9A inside the battery, and the negative electrode is connected to the negative electrode terminal 9B inside the battery.
  • the battery lid 8 is provided with a liquid injection hole for injecting an electrolytic solution into the battery container.
  • the liquid injection hole is sealed by the liquid injection stopper 10 after the electrolytic solution is injected.
  • the electrolytic solution for example, a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF6) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate can be used.
  • a gas discharge valve 11 is provided on the battery lid. The gas discharge valve 11 is formed by partially thinning the battery lid by press working.
  • FIG. 3 is an external perspective view of the intermediate holder 14A.
  • the intermediate holder 14A has a separating portion 15A, a connecting portion 15B, a connecting portion 15C, and a convex portion 15D.
  • the isolation part 15A opposes the wide surface 7A of the battery and prevents the adjacent wide surfaces 7A of the two batteries from coming into contact with each other.
  • the connecting portion 15B has a peak portion, and the connecting portion 15C has a trough portion, and is used for connecting to an adjacent battery holder.
  • the convex portion 15D protrudes on the side opposite to the narrow side surface 7B of the battery, and is used when integrating the battery stack as will be described later.
  • FIG. 4 is an external perspective view of the end holder 14B.
  • the end holder 14B has a separating portion 16A, a connecting portion 16B, a connecting portion 16C, and a convex portion 16D.
  • the isolation part 16A opposes the wide surface 7A of the battery and the end plate, and prevents the wide surface 7A of the battery from contacting the end plate.
  • the connecting portion 16B has a peak portion, and the connecting portion 16C has a trough portion, and is used for connecting with an adjacent battery holder.
  • the convex portion 16D protrudes on the opposite side to the narrow side surface 7B of the battery, and is used when integrating the battery stack as described later.
  • Adjacent intermediate holders or intermediate holders and end holders are connected by fitting the connecting portions of the battery holders. Specifically, the intermediate holder connecting portion 15B and the adjacent intermediate holder connecting portion 15C are fitted to each other so that the adjacent intermediate holders are connected to each other, and the intermediate holder connecting portion 15B and the end holder connecting portion 16C are connected. The intermediate holder and the end holder are connected by fitting the connecting portion 15C of the intermediate holder and the connecting portion 16B of the end holder.
  • the pair of end plates 12 are arranged on both sides of the battery stack 4.
  • the connecting part of the battery holder is connected, and the convex part 15D of the intermediate holder and the convex part 16D of the end holder are convex in the shape of a rectangular parallelepiped facing the opposite side to the narrow side surface 7B of the secondary battery 3 as a whole.
  • the opening 13A of the side frame is fitted into this convex portion.
  • the opening of the side frame is provided corresponding to the shape of the outer shape of the rectangular parallelepiped convex portion, and the side surface contact portion is the intermediate holder with the rectangular parallelepiped convex portion being fitted into the opening of the side frame.
  • the abutting surface portion and the abutting surface portion of the end holder are in contact with each other.
  • the upper and lower opening edges of the opening engage with the upper and lower edges of the protrusion
  • the front and rear opening edges of the opening engage with the front and rear edges of the protrusion of the end holder.
  • the positions of the plurality of intermediate holders and the end holders in the vertical and front-rear and left-right directions are restricted.
  • the position in the front-rear direction of the secondary battery 3 sandwiched between the battery holders is restricted, and the position in the left-right direction of the secondary battery 3 sandwiched between the pair of connecting portions of the battery holder is restricted.
  • the wide surface contact portion and the wide side plate of the secondary battery 3 are in contact with each other, the inner side surface of the connecting portion and the narrow side plate of the secondary battery 3 are in contact with each other.
  • the vertical position of the secondary battery 3 is restricted.
  • the method of fixing the side frame to the end plate using screws has been described.
  • the side frame is fixed to the end plate using bolts, rivets, or the like, or by caulking or welding. May be.
  • the battery part is completed by electrically connecting the positive electrode terminal and the negative electrode terminal of each adjacent secondary battery 3 by a bus bar which is a metal plate-like conductive member.
  • a short-circuit member is connected to the battery part thus manufactured.
  • FIG. 5 shows the structure of the short-circuit member 2 of the first embodiment.
  • the positive electrode charging part is a part electrically connected to the positive electrode, and is a positive electrode terminal itself or a bus bar or the like electrically connected to the positive electrode terminal.
  • the negative electrode charging portion is a portion electrically connected to the negative electrode, such as the negative electrode terminal itself or a bus bar electrically connected to the negative electrode terminal.
  • the short-circuit member 2 has a bow-like thermally responsive part 2A, a base part 2B, and a contact assisting part 2C.
  • the thermally responsive part 2A and the base material part 2B, and the thermally responsive part 2A and the contact auxiliary part 2C are integrated and electrically connected.
  • the thermally responsive part 2A is made of a conductive member whose shape changes due to heat.
  • the thermally responsive portion is a conductive member whose shape changes with heat, and is a bimetal or a shape memory alloy.
  • the temperature (operating temperature) at which the thermally responsive portion operates to form a short circuit varies depending on the constituent material of the battery, the operating temperature is preferably 80 ° C. to 100 ° C. or higher.
  • a bimetal composed of at least two expansion layers, a high expansion layer and a low expansion layer, is preferable.
  • a high expansion layer is made of an alloy of any three of nickel, iron, manganese, and chromium
  • a low expansion layer is made of an alloy of any two of nickel, iron, or chromium. it can.
  • an expansion layer is not limited to two, You may make it three or more layers.
  • a nickel-titanium alloy, a nickel-titanium-cobalt alloy, or the like can be used. The above is preferable.
  • the base part 2B is a member that is inferior in conductivity to the thermally responsive part 2A.
  • the base material part 2B is not necessarily required, it is provided between the thermally responsive part and the charging part, and the current flowing through the thermally responsive part can be controlled.
  • the lower surface 2D of the base material part 2B is electrically connected to the charging part.
  • the contact assistant 2C is a conductive member made of a soft metal such as copper. The contact assistant 2C is not necessarily required, but assists the electrical connection between the thermally responsive part when it moves and contacts the opposite charging part.
  • the heat-responsive portion 2A moves in the horizontal direction with respect to the lower surface 2D of the base material portion when the shape changes due to heat.
  • FIG. 6 is a diagram of the assembled battery 1 provided with the short-circuit member 2.
  • Adjacent secondary batteries 3 are stacked with their wide surfaces facing each other, and a plurality of secondary batteries 3 are connected to each other so that the adjacent secondary batteries 3 are connected in a positive electrode terminal 9A and a negative electrode terminal 9B. Connected by busbar.
  • busbar Connected by busbar.
  • a short-circuit member 2 is provided at a location not connected by the bus bar 6A.
  • the short-circuit member 1 is electrically connected to either the positive electrode charging portion or the negative electrode charging portion when the secondary battery 3 is lower than a predetermined temperature.
  • the bus bar 6A is provided on the positive electrode terminal 9A side.
  • the positive terminal 9A and the negative terminal 9B that are not electrically connected by the bus bar 6A are not electrically connected, but the temperature of the secondary battery 3 is equal to or higher than a predetermined value.
  • the heat-responsive portion 2A is deformed and the positive electrode terminal 9A and the negative electrode terminal 9B are in electrical contact, thereby forming a short circuit.
  • the predetermined value is a temperature at which the thermally responsive portion 2A is deformed, and the material and structure forming the thermally responsive portion 2A, for example, the layer thickness and material of the above-described high expansion layer and low expansion layer are changed. Adjustment can be made as appropriate.
  • means for using a conductive binder such as welding or solder for electrical connection between the thermally responsive part 2A and the base part 2B, the thermally responsive part 2A and the contact assisting part 2C, and the equipment part 2B and the charging part. Can be applied.
  • the arc-shaped thermally responsive portion moves in the horizontal direction of the positive electrode charged portion and the negative electrode charged portion, and the charged portion that has not been in electrical contact with the short-circuit member until now. And the short-circuit member are in contact with each other and the adjacent batteries are electrically connected.
  • the direction in which the short-circuit member moves is not limited to the horizontal direction of the positive electrode charging portion and the negative electrode charging portion.
  • the short-circuit member may move in the height direction of the positive electrode charging portion and the negative electrode charging portion.
  • a resistor 18 can be provided at a location that is electrically separated from the thermal actuator when the temperature is lower than the operating temperature.
  • a short circuit is formed between the adjacent secondary batteries 3 by the short circuit member at a high temperature. For this reason, at the time of high temperature, it can discharge between adjacent batteries and can reduce the charge amount of a battery. As a result, an excessively high temperature can be prevented.
  • FIG. 8 is an external perspective view of the short-circuit member 2 according to the second embodiment.
  • the short-circuit member 2 includes a base material portion 17B provided with a plate-like heat-responsive portion 17A and a heat-responsive portion 17A, and a contact assisting portion 17C.
  • the temperature of the secondary battery 3 is sensed by the lower surface 17D of the base material portion 17B, and the heat responsive portion 17A moves in the direction of the dotted arrow by the heat.
  • FIG. 9 is an external view of the assembled battery 1 having the short-circuit member 2 of the second embodiment.
  • the short-circuit member 2 is installed between the positive electrode charging portion and the negative electrode charging portion that are not connected by the bus bar 6A, and the battery lid of the secondary battery 3 and the battery lid direction are defined as the height direction.
  • the short-circuit member is provided on the height direction side of the positive electrode charging portion and the negative electrode charging portion.
  • the short-circuit member 2 is provided on the base portion 17B of the short-circuit member 2 on the positive electrode terminal 9A side of the bus bar 6A.
  • the temperature of the secondary battery 3 is sensed by the lower surface 17D of the base material part 17B, and the heat responsive part 17A comes into contact with the bus bar provided on the negative electrode terminal 9B of the adjacent secondary battery 3 by the heat. Is in the height direction (deformed from the upper side to the lower side of the negative terminal) to form a short circuit.
  • the assembled battery according to the present embodiment has the same structure as that of the assembled battery of Example 1 except for the configuration of the short-circuit member, the description of overlapping points is omitted.
  • the heat generated in the secondary battery 3 is generated in a large amount in the positive electrode, the negative electrode, the positive electrode current collector connecting the positive electrode and the positive electrode terminal, and the negative electrode current collector connecting the negative electrode and the negative electrode terminal.
  • FIG. 10 is an external perspective view of the short-circuit member 2 according to the third embodiment.
  • the short-circuit member 2 has a thermally responsive part 19A, a base part 19B, and a contact assisting part 19C.
  • a bifurcated thermally responsive portion 19A is provided at the end of the plate-like base material portion 19B, and each thermally responsive portion 19A moves in the direction opposite to the wide surface direction of the base material portion 19B (in the direction of the dotted arrow in the figure). be able to.
  • the thermally responsive portion 19A and the base material portion 19B, and the thermally responsive portion 19A and the contact assisting portion 19C are integrated and electrically connected.
  • the thermally responsive portion 19A is made of a conductive member whose shape changes with heat.
  • the base material portion 19B is a heat conductor such as metal.
  • the base material portion 19B is thermally connected to the battery can.
  • the base material portion 19B is not always necessary, and the heat responsive portion may be directly connected to the battery can.
  • the contact assistant 19C is a conductive member made of a soft metal such as copper.
  • the contact assisting part 19C is not necessarily required, but assists the electrical connection between the thermally responsive part when it moves and contacts the opposing charging part.
  • the heat-responsive portion 19A moves in a direction perpendicular to the base material portion 19B when the shape changes due to heat.
  • FIG. 11 is an external view of the assembled battery 1 having the short-circuit member 2 according to the third embodiment.
  • the short-circuit member 2 is provided between the positive electrode charging portion and the negative electrode charging portion that are not connected by the bus bar 6A.
  • the base material portion 19B is provided between the wide surfaces of the adjacent secondary batteries 3.
  • the base material portion 19B is provided in a state of being in thermal contact with the wide surface of the secondary battery 3 in order to transmit the heat of the secondary battery 3 to the heat responsive portion 19A.
  • the base material portion 19B may be in contact with two adjacent secondary batteries 3 or one of them.
  • the short-circuit member 2 contacts the positive electrode charging portion and the negative electrode charging portion to form a short circuit. Since the short circuit can be formed by detecting the temperature of the surface of the battery can, an excessive temperature rise of the battery can be prevented.
  • this embodiment can catch the heat of the wide surface of the battery can, it can catch the heat fluctuation of a wider area.
  • FIG. 12 is an external perspective view of the short-circuit member 2 according to the fourth embodiment.
  • the short-circuit member 2 has a thermally responsive part 20A, a base part 20B, and a contact assisting part 20C.
  • the thermally responsive portion 20A and the base material portion 20B, and the thermally responsive portion 20A and the contact assisting portion 20C are integrated and electrically connected.
  • the block-like base material portion 20B is provided with a U-shaped plate-like heat responsive portion 20A, and a contact assisting portion 20C is provided at the end of the heat responsive portion 20A.
  • the base material portion 20B is thermally connected to the battery lid.
  • the base material portion 19B is not necessarily required, and the heat responsive portion may be directly connected to the battery can.
  • the contact assistant 20C is electrically connected to the thermally responsive part 20A.
  • the contact assistant 20C is not always necessary, but assists the electrical connection between the thermally responsive part when it moves and contacts the opposite charging part. The heat is transferred from the base material portion 20B that has received heat to the heat responsive portion 20A, and the heat responsive portion 20A is deformed by sensing the heat.
  • FIG. 13 is an external view of the assembled battery 1 having the short-circuit member 2 according to the fourth embodiment.
  • the short-circuit member 2 is also provided with a position corresponding to the horizontal direction (direction along the battery lid) of the positive electrode charging portion and the negative electrode charging portion that are not connected by the bus bar 6A between the adjacent secondary batteries 3.
  • the base material portion 20 ⁇ / b> B is provided on the battery lid of the secondary battery 3.
  • the base material portion 20B is provided in a state of being in thermal contact with the battery lid in order to transmit the heat of the secondary battery 3 to the heat responsive portion 20A.
  • the contact assisting unit 20C may be in contact with either the positive electrode charging unit or the negative electrode charging unit at a low temperature, or may be in a state separated from both.
  • the contact assisting unit 20C includes the secondary battery 3. Is provided only in contact with the positive electrode terminal 6A at low temperatures. When the secondary battery 3 exceeds a predetermined temperature, the thermally responsive part 20A is deformed, and the contact auxiliary part 20C electrically connects the positive electrode terminal 9A as the positive electrode charging part and the negative electrode terminal 9B as the negative electrode charging part.
  • the short-circuit member 2 is provided on the lid as in the fourth embodiment, since the base material portion 20B can be provided at any location on the lid wider than the charging portion, there is a good improvement in design flexibility. .
  • FIG. 14 is an external perspective view of the short-circuit member 2 according to the fifth embodiment.
  • Example 5 the short-circuit member is connected to the two adjacent secondary batteries 3 in Example 4, and when either battery reaches a predetermined temperature or more, it is detected and the short-circuit member operates. It is a thing.
  • the short-circuit member 2 is provided with two base parts 21B on a U-shaped plate-like heat-responsive part 20A.
  • a contact assisting portion 21C is provided at the end of the thermally responsive portion 20A on the side where the base material portion 21B is not provided, as in the fourth embodiment.
  • FIG. 15 is an external view of the assembled battery 1 having the short-circuit member 2 according to the fifth embodiment.
  • the short-circuit member 2 is provided at a position facing the positive electrode charging portion and the negative electrode charging portion that are not connected by the bus bar 6A between the adjacent secondary batteries 3.
  • the base material portion 21B is provided in a state of being in thermal contact with the battery lid in order to transmit the heat of the secondary battery 3 to the heat responsive portion 20A.
  • the base material portion 21 ⁇ / b> B is provided on the lid of each secondary battery 3 in order to sense the heat of any of the adjacent secondary batteries 3.
  • the short circuit can be formed by detecting the temperature of the surface of the battery lid, it is possible to prevent an excessive temperature rise of the battery.
  • FIG. 16 is an external perspective view of the short-circuit member 2 according to the sixth embodiment.
  • the short-circuit member 2 has a resistance change portion 22A and two base material portions 22B.
  • the resistance change portion 22A and the base material portion 22B are in contact with each other.
  • the resistance changing portion 22A has a characteristic that the resistance value changes according to the temperature, and the resistance value decreases as the temperature increases. For this reason, the two base material portions 22B are not electrically connected at a low temperature, and the resistance of the resistance change portion 22A is lowered and electrically connected due to the high temperature.
  • the resistance change portion 22A As a material of the resistance change portion 22A, ceramics including manganese, nickel, cobalt, iron, vanadium oxide, or the like can be used.
  • the base material portion 22B is a heat conductor such as metal.
  • the lower surface 22C of the base material portion 22B is electrically connected to the charging portion.
  • the positive electrode terminal and the negative electrode terminal may be connected to each other, or the bus bar provided to the positive electrode terminal and the bus bar provided to the negative electrode terminal may be connected to each other.
  • the base material portion 22B is not necessarily required, and the resistance change portion may be directly connected to the charging portion.
  • FIG. 17 is an external view of the assembled battery 1 having the short-circuit member 2 of Example 6.
  • the short-circuit member 2 includes a positive electrode charging portion and a negative electrode charging portion (a bus bar 6A provided at the positive electrode terminal 9A and a bus bar 6A provided at the negative electrode terminal 9B) in which the adjacent secondary batteries 3 are not connected by the bus bar 6A. Connected.
  • the positive electrode charging portion and the negative electrode charging portion are not electrically connected.
  • the resistance of the resistance change portion 22A decreases, and the positive electrode charging portion and the negative electrode charging portion are electrically connected. Since the positive electrode charging portion and the negative electrode charging portion are electrically connected to each other, a short circuit can be formed, so that excessive heat generation of the secondary battery 3 can be avoided.
  • the short-circuit member of Example 6 does not require a change in shape due to temperature rise, the shape of the short-circuit member can be simplified. For this reason, even if the shape slightly changes due to external impact or the like, the role as a short-circuit member is easily maintained.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Thermally Actuated Switches (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne une batterie assemblée au moyen de laquelle il est possible de réduire la quantité de charge d'une cellule à des températures élevées par l'intermédiaire d'une opération fiable. L'invention concerne une batterie assemblée ayant une pluralité de cellules secondaires, qui ont un contenant de cellule et une borne d'électrode positive et une borne d'électrode négative, le contenant de cellule ayant une paire de surfaces de grande largeur et deux ensembles de surfaces de petite largeur tournées les unes vers les autres, la borne d'électrode positive et la borne d'électrode négative étant disposées sur l'une quelconque des surfaces de petite largeur, la pluralité de cellules secondaires étant empilées de telle sorte que les surfaces de grande largeur sont tournées les unes vers les autres, et la borne d'électrode positive et la borne d'électrode négative de cellules secondaires adjacentes étant connectées par une barre omnibus de telle sorte que la pluralité de cellules secondaires sont connectées en série, les cellules secondaires ayant un élément de court-circuit pour conduire un courant entre une unité de charge d'électrode positive et une unité de charge d'électrode négative, où une barre omnibus n'est pas prévue, en réponse à une augmentation de la température de la cellule secondaire.
PCT/JP2017/003509 2016-02-29 2017-02-01 Module de cellule au lithium-ion Ceased WO2017150052A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016036554A JP6751570B2 (ja) 2016-02-29 2016-02-29 リチウムイオン電池モジュール
JP2016-036554 2016-02-29

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WO2017150052A1 true WO2017150052A1 (fr) 2017-09-08

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WO (1) WO2017150052A1 (fr)

Families Citing this family (7)

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CN110959203B (zh) * 2017-08-10 2022-09-13 松下知识产权经营株式会社 电池组及其制造方法
KR102353921B1 (ko) 2018-01-12 2022-01-20 주식회사 엘지에너지솔루션 배터리 모듈, 이를 포함하는 배터리 팩 및 자동차
KR102889613B1 (ko) * 2019-07-10 2025-11-20 주식회사 엘지에너지솔루션 과충전 방지가 가능한 구조를 갖는 배터리 모듈, 이를 포함하는 배터리 팩, 그리고 이러한 배터리 팩을 포함하는 자동차
CN112582719B (zh) 2019-09-29 2022-04-29 东莞新能源科技有限公司 电池模组单元、电池模组、储能系统及电动车辆
JP7333001B2 (ja) 2019-12-26 2023-08-24 トヨタ自動車株式会社 組電池および電池ホルダー
CN112635889B (zh) * 2020-12-10 2021-11-30 东风汽车集团有限公司 一种防爆电池
KR102835259B1 (ko) * 2021-11-02 2025-07-16 주식회사 엘지에너지솔루션 과충전 방지가 가능한 이차전지 및 이의 충전방법

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JP2005044626A (ja) * 2003-07-22 2005-02-17 Sanyo Gs Soft Energy Co Ltd 電池
JP2005251446A (ja) * 2004-03-02 2005-09-15 Matsushita Electric Ind Co Ltd 非水電解液二次電池
JP2008541374A (ja) * 2005-05-10 2008-11-20 エルジー・ケム・リミテッド 二次電池の保護回路及びそれを備えた二次電池
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