US20190296313A1 - Assembled battery and manufacturing method of assembled battery - Google Patents
Assembled battery and manufacturing method of assembled battery Download PDFInfo
- Publication number
- US20190296313A1 US20190296313A1 US16/353,501 US201916353501A US2019296313A1 US 20190296313 A1 US20190296313 A1 US 20190296313A1 US 201916353501 A US201916353501 A US 201916353501A US 2019296313 A1 US2019296313 A1 US 2019296313A1
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- United States
- Prior art keywords
- busbar
- electrode terminal
- assembled battery
- plate
- joining projection
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- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 238000005304 joining Methods 0.000 claims abstract description 62
- 238000003466 welding Methods 0.000 claims abstract description 59
- 230000000630 rising effect Effects 0.000 claims description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Images
Classifications
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- H01M2/206—
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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
- H01M50/502—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
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- H01M2/1077—
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- H01M2/30—
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
- H01M50/204—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
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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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
- H01M50/502—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
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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
- H01M50/502—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
-
- 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
- H01M50/547—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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 disclosure to an assembled battery in which a plurality of single cells are electrically connected and to a method of manufacturing the assembled battery.
- Assembled batteries using a secondary battery such as a lithium-ion secondary battery or a nickel-hydrogen battery or a storage element such as a capacitor as a single cell and including a plurality of the single cells are growing in importance as vehicle-mounted power supplies and as power supplies for personal computers, mobile phones, and the like.
- assembled batteries using a lithium-ion secondary battery which is lightweight and which is capable of producing high energy density as a single cell are preferably used as a high-output power supply to be mounted to a vehicle and the like.
- a single cell constituting such an assembled battery includes an outer package which houses an electrode body and electrode terminals of positive and negative electrodes.
- an elongated plate-shaped conductive member or the like is used as the electrode terminal.
- a first end of the electrode terminal is connected to the electrode body inside the outer package and a second end thereof is exposed to the outside of the outer package.
- the assembled battery is constructed by arranging a plurality of the single cells structured as described above along a prescribed arrangement direction and electrically connecting the electrode terminals of the respective single cells by an inter-cell connecting member (a busbar).
- FIG. 11 is a sectional view illustrating a connection structure of single cells in a conventional assembled battery.
- plate-shaped electrode terminals 112 are bent and brought into surface contact with each other between adjacent single cells 110 .
- a plate-shaped busbar 130 is disposed so as to cover tip portions of the respective electrode terminals 112 .
- a contact portion between the busbar 130 and the electrode terminal 112 is irradiated with a laser beam L from outside of the busbar 130 and a welded portion 140 is formed so as to straddle the busbar 130 and the electrode terminal 112 .
- the respective single cells 110 are electrically connected via the busbar 130 and the electrode terminals 112 .
- the “outside of the busbar” is assumed to indicate a side on which single cells are not disposed.
- Japanese Patent Application Publication No. 2016-91607 discloses an example of an assembled battery in which each of a plurality of single cells is electrically connected by welding a busbar and electrode terminals to each other.
- the electrode terminals 112 are brought into surface contact with each other between adjacent single cells 110 in the assembled battery 100 , if a gap has been created between the electrode terminals 112 , since the laser beam L passes through the gap and irradiates the single cell 110 , there is a risk that the single cell 110 may become damaged by heat of the laser beam L.
- the present disclosure has been made in order to solve the problems described above and a primary object thereof is to provide a technique which enables welding of a busbar and an electrode terminal to each other to be appropriately performed and which enables occurrences of damage to a single cell and a poor weld to be preferably prevented.
- the present disclosure provides an assembled battery configured as described below.
- the single cell of the assembled battery includes an electrode body, an outer package which houses the electrode body, and an electrode terminal which is a plate-shaped conductive member having a first end connected to the electrode body inside the outer package and a second end protruding to the outside of the outer package.
- the busbar includes a plate-shaped base portion which is disposed between the electrode terminals of adjacent single cells and which extends along the arrangement direction, and a plate-shaped joining projection extending along the plate-shaped electrode terminal and a locking biasing portion which locks the electrode terminal and the busbar to each other and which biases the electrode terminal toward the joining projection are formed at both ends of the plate-shaped base portion in the arrangement direction.
- the plate-shaped electrode terminal and the plate-shaped joining projection come into surface contact with each other and a tip portion of the electrode terminal and a tip portion of the joining projection are welded to each other.
- the present inventors conducted various studies on causes of occurrences of damage to a single cell and a poor weld when welding the electrode terminal and the busbar to each other.
- the present inventors considered that, with conventional techniques, it is difficult to bring welded objects into contact with each other in an appropriate manner.
- the assembled battery 100 shown in FIG. 11 since the electrode terminal 112 and the busbar 130 which are welded objects are not fixed, there is a possibility that a gap is created between the welded objects.
- the creation of the gap cannot be confirmed. Therefore, the possibility that the single cell 110 is damaged by the laser beam L passing through a gap of the electrode terminal 112 increases.
- the present inventors considered that, if a state of welding can be checked when welding an electrode terminal and a busbar to each other and, at the same time, if welded objects can be brought into surface contact with each other in an appropriate manner, the occurrence of various problems that may occur when welding the electrode terminal and the busbar to each other can be prevented. Further studies carried out based on this idea culminated in the conception of a structure of the assembled battery disclosed herein.
- a plate-shaped joining projection that extends along an electrode terminal is formed at both ends of a base portion of a busbar.
- the joining projection of the busbar and an electrode terminal of a single cell are brought into surface contact with each other and a tip portion of the electrode terminal and a tip portion of the joining projection are welded to each other. Since welding can be performed while confirming a state of welding by adopting this structure, the welding of the electrode terminal and the busbar to each other can be performed while appropriately adjusting welding conditions.
- the joining projection and the electrode terminal can be brought into surface contact with each other in an appropriate manner. Accordingly, since a gap can be appropriately prevented from being created between members that are welded objects, a situation where a laser beam passes through the gap and damages the single cell can be avoided.
- the welding of the busbar and the electrode terminal to each other can be appropriately performed and occurrences of damage to the single cell and a poor weld can be preferably prevented.
- a locking biasing portion is provided at each of both side edges of both ends of a plate-shaped base portion.
- the locking biasing portion is more favorably formed in plurality at each of both ends of the base portion.
- a total of four locking biasing portions can be provided by forming the locking biasing portion at each of both side edges of both ends of the base portion as in the aspect described above, welding of the busbar and the electrode terminal to each other can be performed more preferably and occurrences of damage to the single cell and a poor weld can be more reliably prevented.
- the locking biasing portion includes a rising portion which extends along the electrode terminal from both ends of the base portion and an arm portion which covers a tip portion of the electrode terminal and which extends in a curved manner from a tip portion of the rising portion so as to oppose the rising portion.
- the tip portion of the electrode terminal and the arm portion can be brought into contact with each other and a height position of the tip portion of the electrode terminal can be aligned with a height position of the tip portion of the joining projection.
- the welding of the electrode terminal and the joining projection to each other can be performed more preferably.
- an outer package of the single cell is a laminated film.
- a laminated film is less heat-resistant than a metallic case, there is another problem in that, when welding the electrode terminal and the busbar to each other using a laser beam, a single cell may become readily damaged when the outer package is irradiated by the laser beam.
- welding can be performed while checking a state of welding and, at the same time, a gap can be prevented from being created between welded objects. Therefore, a single cell can be appropriately prevented from being irradiated with a laser beam.
- the manufacturing method of an assembled battery disclosed herein is a method of manufacturing an assembled battery in which a plurality of single cells are arranged along a prescribed arrangement direction and each of adjacent single cells is electrically connected by a busbar.
- the single cell of an assembled battery obtained by the manufacturing method described above includes an electrode body, an outer package which houses the electrode body, and an electrode terminal which is a plate-shaped conductive member having a first end connected to the electrode body inside the outer package and a second end protruding to the outside of the outer package.
- the busbar includes a plate-shaped base portion which is disposed between the electrode terminals of adjacent single cells and which extends along the arrangement direction, and a plate-shaped joining projection extending along a height direction of the single cell and a locking biasing portion which locks the electrode terminal of the single cell and which biases the electrode terminal toward the joining projection are formed at both ends of the plate-shaped base portion in the arrangement direction.
- the manufacturing method of an assembled battery disclosed herein includes the steps of: bringing the plate-shaped electrode terminal and the plate-shaped joining projection into surface contact with each other, causing the locking biasing portion to lock the electrode terminal of the single cell, and causing the locking biasing portion to bias the electrode terminal toward the joining projection; and welding a tip portion of the electrode terminal and a tip portion of the joining projection to each other.
- the tip portion of the electrode terminal extending along the height direction and the tip portion of the joining projection of the busbar are welded to each other. Accordingly, since welding can be performed while confirming a state of welding, the welding of the electrode terminal and the busbar to each other can be performed in an appropriate manner.
- the busbar and the electrode terminal can be fixed to each other and the electrode terminal can be biased toward the joining projection. Therefore, a gap can be prevented from being created between the electrode terminal and the joining projection which are welded objects.
- the welding of the busbar and the electrode terminal to each other can be appropriately performed and occurrences of damage to the single cell and a poor weld can be preferably prevented.
- the tip portion of the electrode terminal and the tip portion of the joining projection are welded to each other by a laser beam.
- means for welding the electrode terminal and the busbar to each other is not limited to laser welding and various welding means such as ultrasonic welding can be adopted. Even when such welding means other than laser welding is used, since welding can be performed while checking welding positions of the electrode terminal and the busbar from the outside and, at the same time, the electrode terminal and the busbar can be brought into surface contact with each other in an appropriate manner, an effect of preferably preventing the occurrences of a poor weld and the like can be achieved.
- FIG. 1 is a plan view schematically showing an assembled battery according to an embodiment of the present disclosure
- FIG. 2 is a side view schematically showing a cell used in the assembled battery according to the embodiment of the present disclosure
- FIG. 3A is a plan view illustrating a procedure of fabricating a busbar used in the assembled battery according to the embodiment of the present disclosure
- FIG. 3B is a perspective view showing a first end of the busbar used in the assembled battery according to the embodiment of the present disclosure
- FIG. 4 is a perspective view schematically showing a connection structure between electrode terminals and the busbar of the assembled battery according to the embodiment of the present disclosure
- FIG. 5 is a sagittal view along V-V in FIG. 1 ;
- FIG. 6 is a perspective view showing a first end of a busbar used in an assembled battery according to another embodiment of the present disclosure
- FIG. 7 is a plan view showing a first end of a busbar used in an assembled battery according to another embodiment of the present disclosure.
- FIG. 8 is a plan view schematically showing an assembled battery according to another embodiment of the present disclosure.
- FIG. 9 is a side view schematically showing a cell used in an assembled battery according to another embodiment of the present disclosure.
- FIG. 10A is a plan view schematically showing an assembled battery constructed using the cell shown in FIG. 9 ;
- FIG. 10B is a plan view schematically showing an assembled battery constructed using the cell shown in FIG. 9 ;
- FIG. 11 is a sectional view illustrating a connection structure between single cells in a conventional assembled battery.
- an assembled battery using a lithium-ion secondary battery as a single cell and including a plurality of the lithium-ion secondary batteries will be described as an example of an assembled battery according to an embodiment of the present disclosure.
- the single cell used in the assembled battery disclosed herein is not limited to a lithium-ion secondary battery and, for example, a secondary battery such as a nickel-hydrogen battery or a storage element such as a capacitor can also be used.
- FIG. 1 is a plan view schematically showing an assembled battery according to the present embodiment. It should be noted that, in the respective drawings of the present specification, reference character X indicates “an arrangement direction of a single cell”, reference character Y indicates “a width direction of a single cell”, and reference character Z indicates “a height direction of a single cell”.
- an assembled battery 1 includes a plurality of (in FIG. 1 , twenty) single cells 10 .
- Each of the single cells 10 is arranged along the arrangement direction X.
- a buffer member 60 is sandwiched between the arranged single cells 10 .
- each of the single cells 10 is electrically connected by a busbar 30 .
- a constraining plate 50 is disposed on both outer sides in the arrangement direction X and a constraining band 52 is stretched across a pair of the constraining plates 50 . Accordingly, the single cells 10 arranged along the arrangement direction X are constrained by the pair of constraining plates 50 .
- the single cell 10 arranged at a first end (a left side in FIG. 1 ) in the arrangement direction X will be referred to as a “first single cell”.
- single cells subsequent to the “first single cell” will be referred to by sequentially increasing arrangement numbers such as “a second single cell, a third single cell, and so on” toward a second end (a right side in FIG. 1 ).
- FIG. 2 is a side view schematically showing a cell used in the assembled battery according to the present embodiment.
- the single cell 10 according to the present embodiment includes an outer package 11 .
- a laminated film is used as the outer package 11 and an electrode body and an electrolyte are housed inside the laminated film.
- electrode bodies and electrolytes similar to those used in conventional general lithium-ion secondary batteries can be used without restrictions as the electrode body and the electrolyte, a detailed description thereof will be omitted.
- the single cell 10 includes a pair of electrode terminals 12 and 14 constituted by a positive electrode and a negative electrode.
- Each of the electrode terminals 12 and 14 is an elongated plate-shaped conductive member and extends along the height direction Z of the single cell 10 .
- a first end of the electrode terminals 12 and 14 is electrically connected to the electrode body inside the outer package 11 .
- a second end of the electrode terminals 12 and 14 is exposed to the outside of the outer package 11 and extends along the height direction Z as shown in FIG. 2 .
- An electrode terminal indicated by reference character 12 in FIG. 2 is a positive electrode terminal connected to the positive electrode of the electrode body.
- an electrode terminal indicated by reference character 14 is a negative electrode terminal connected to the negative electrode of the electrode body.
- the outer package 11 of the single cell 10 according to the present embodiment is provided with an insulated holder 17 which holds the electrode terminals 12 and 14 exposed to the outside of the outer package 11 .
- the assembled battery 1 includes a plurality of plate-shaped busbars 30 which extend along the arrangement direction X of the single cells 10 .
- each of the adjacent single cells 10 is sequentially connected by the busbars 30 .
- positive electrode terminals 12 (and negative electrode terminals 14 ) of the first to fourth single cells 10 are connected by the busbars 30 (each of the first to fourth single cells 10 is connected in parallel).
- each single cell 10 is disposed in opposite orientations so that positions of the positive electrode terminals 12 and the negative electrode terminals 14 are reversed relative to the first to fourth single cells 10 .
- the positive electrode terminal 12 of the fourth single cell 10 and the negative electrode terminal 14 of the fifth single cell 10 are connected by the busbar 30 and, at the same time, the fifth to eighth single cells 10 are connected in parallel.
- the assembled battery 1 according to the present embodiment is constructed by forming a plurality of units which connect four single cells 10 in parallel and then connecting the units with each other in series.
- a busbar (a total positive busbar) 30 A which is only connected to the positive electrode terminal 12 of the first single cell 10 is provided at the first end in the arrangement direction X
- a busbar (a total negative busbar) 30 B which is only connected to the negative electrode terminal 14 of the 20th single cell 10 is provided at the second end in the arrangement direction X.
- the total positive busbar 30 A and the total negative busbar 30 B are connected to an external device such as a motor of a vehicle.
- the busbar 30 is fabricated by die-cutting a conductive plate (for example, an aluminum plate or a copper plate) having prescribed rigidity and bending the die-cut conductive plate. Specifically, first, a notched portion 35 A is formed by die-cutting a center of both ends of a conductive plate 35 such as that shown in FIG. 3A . Subsequently, the conductive plate 35 is bent along dotted line portions L 1 to L 14 shown in FIG. 3A to fabricate the busbar 30 according to the present embodiment.
- a conductive plate for example, an aluminum plate or a copper plate
- the busbar 30 fabricated in this manner includes a base portion 32 which extends along the arrangement direction X of the single cells 10 .
- a joining projection 36 which extends along the height direction Z is formed at the center of both ends of the base portion 32 .
- a locking biasing portion 38 with an inverted U-shape is formed at each of both side edges of both ends of the base portion 32 .
- the locking biasing portion 38 with an inverted U-shape includes a rising portion 38 a which extends along the height direction Z (the direction in which the electrode terminals 12 and 14 extend) and an arm portion 38 b which extends in a curved manner from a tip portion of the rising portion 38 a so as to oppose the rising portion 38 a .
- an inserted portion 38 c which is enclosed by the rising portion 38 a and the arm portion 38 b is formed in the locking biasing portion 38 of the busbar 30 .
- the arm portion 38 b is bent so that respective positions in the height direction X of an upper portion of the inserted portion 38 c and a tip portion 36 a of the joining projection 36 are aligned with each other.
- FIG. 4 is a perspective view schematically showing electrode terminals and a busbar of the assembled battery according to the present embodiment
- FIG. 5 is a sagittal view along V-V in FIG. 1 .
- the busbar 30 includes the base portion 32 which extends along the arrangement direction X, the joining projection 36 which extends along the height direction Z from the center of both ends of the base portion 32 , and the locking biasing portion 38 with an inverted U-shape which is formed at both side edges of both ends of the base portion 32 .
- the base portion 32 of the busbar 30 is disposed between the respective electrode terminals 12 and 14 of two adjacent single cells 10 and the electrode terminals 12 and 14 are inserted into the inserted portions 38 c (refer to FIG. 3 ) of the locking biasing portions 38 formed at both ends of the busbar 30 . Accordingly, the electrode terminals 12 and 14 are locked by the locking biasing portions 38 and the busbar 30 and the electrode terminals 12 and 14 are fixed to each other.
- the arm portion 38 b which is curved so as to oppose the rising portion 38 a is formed and the electrode terminals 12 and 14 are pressed by the arm portion 38 b . Accordingly, the electrode terminals 12 and 14 of the single cell 10 are biased toward the joining projection 36 . As a result, the electrode terminals 12 and 14 and the joining projection 36 of the busbar 30 can be brought into surface contact with each other in an appropriate manner.
- the arm portion 38 b of the locking biasing portion 38 is formed so as to cover tip portions 12 a and 14 a of the electrode terminals 12 and 14 , and the tip portions 12 a and 14 a of the electrode terminals 12 and 14 are brought into contact with an upper portion of the arm portion 38 b of the locking biasing portion 38 . Accordingly, a height position of the tip portion 36 a of the joining projection 36 of the busbar 30 and height positions of the tip portions 12 a and 14 a of the electrode terminals 12 and 14 can be aligned with each other.
- the tip portion 36 a of the joining projection 36 and the tip portions 12 a and 14 a of the electrode terminals 12 and 14 are respectively irradiated with a laser beam and a welded portion 40 is formed so as to straddle the joining projection 36 and the electrode terminals 12 and 14 . Accordingly, the busbar 30 and the electrode terminals 12 and 14 are welded and electrically connected to each other.
- the joining projection 36 which comes into surface contact with the electrode terminals 12 and 14 is formed on the busbar 30 .
- the tip portion 36 a of the joining projection 36 and the tip portions 12 a and 14 a of the electrode terminals 12 and 14 are welded to each other. Adopting such a structure enables welding to be performed while checking a state of welding between the electrode terminals 12 and 14 and the busbar 30 . Therefore, according to the present embodiment, the welding of the busbar 30 and the electrode terminals 12 and 14 to each other can be appropriately performed and occurrences of damage to the single cell 10 , a poor weld, and the like can be preferably prevented.
- the electrode terminals 12 and 14 of the single cell 10 and the joining projection 36 of the busbar 30 are locked by the locking biasing portion 38 and, at the same time, the electrode terminals 12 and 14 are biased toward the joining projection 36 by the locking biasing portion 38 . Accordingly, a gap can be prevented from being created between the electrode terminals 12 and 14 and the joining projection 36 which are welded objects. As a result, a situation where a laser beam passes through a gap between welded objects and ends up irradiating the single cells 10 can be preferably prevented.
- the arm portion 38 b of the locking biasing portion 38 is formed so as to cover tip portions 12 a and 14 a of the electrode terminals 12 and 14 , the height positions of the tip portions 12 a and 14 a of the electrode terminals 12 and 14 and the height position of the tip portion 36 a of the joining projection 36 can be readily aligned with each other. Accordingly, the welded portion 40 which straddles the tip portions 12 a and 14 a of the electrode terminals 12 and 14 and the tip portion 36 a of the joining projection 36 can be readily formed.
- a laminated film is used as the outer package 11 of the single cell 10 . While the laminated film has various advantages including low material cost, since the laminated film is less rigid than a metallic battery case, there is a problem in that it is difficult to position each single cell 10 . In contrast, in the present embodiment, since the electrode terminals 12 and 14 of each single cell 10 are fixed via the busbar 30 having the locking biasing portion 38 , each single cell 10 can be readily positioned.
- the laminated film is less heat-resistant than a metallic case, there is another problem in that the single cell 10 may be readily damageable when the laminated film is irradiated by a laser beam.
- the electrode terminals 12 and 14 are biased toward the joining projection 36 by the arm portion 38 b of the locking biasing portion 38 , a gap can be prevented from being created between the electrode terminals 12 and 14 and the joining projection 36 . Accordingly, a situation where the single cells 10 are irradiated by a laser beam having passed through a gap between members that are welded objects can be appropriately prevented.
- problems that arise from the use of a laminated film as the outer package 11 can be appropriately solved and only advantages such as a low material cost can be enjoyed.
- the outer package used in the assembled battery disclosed herein is not limited to a laminated film and a battery case or the like made of a metal such as aluminum may also be used.
- the busbar 30 includes four locking biasing portions 38 .
- the locking biasing portion of the busbar need only be capable of locking the electrode terminals and the busbar to each other and biasing the electrode terminals toward the joining projection, and the number of locking biasing portions is not limited to that in the embodiment described above.
- one locking biasing portion 38 is formed at the center of each of both ends of the base portion 32 and, at the same time, the joining projection 36 is formed which extends along the height direction Z from both side edges of both ends of the base portion 32 .
- the electrode terminals and the busbar 30 C can be locked to each other by the locking biasing portions 38 and, at the same time, the electrode terminals can be biased toward the joining projection 36 by the arm portions 38 b of the locking biasing portions 38 .
- forming the locking biasing portion 38 on each of both side edges of both ends of the base portion 32 as in the busbar 30 shown in FIG. 3B is favorable because the busbar 30 and the electrode terminals can be fixed to each other in a more preferable manner.
- a shape of the locking biasing portion 38 is similarly not limited to that in the embodiment described above.
- the locking biasing portion 38 of the busbar 30 includes the arm portion 38 b which is curved so as to cover the tip portions 12 a and 14 a of the electrode terminals 12 and 14 as shown in FIG. 4 .
- the electrode terminals 12 and 14 and a busbar 30 D can be locked to each other and the electrode terminals 12 and 14 can be biased toward the joining projection 36 by the arm portion 38 d.
- the arm portion 38 b which is curved so as to cover the tip portions 12 a and 14 a of the electrode terminals 12 and 14 as described above is favorable because the height positions of the tip portions 12 a and 14 a of the electrode terminals 12 and 14 and the height position of the tip portion 36 a of the joining projection 36 can be aligned with each other and welding of the electrode terminals 12 and 14 to the joining projection 36 can be readily performed.
- an arrangement structure of the respective single cells constituting the assembled battery is similarly not limited to that in the embodiment described above and can be changed as deemed appropriate in accordance with a purpose of the assembled battery and a structure of the single cells.
- the assembled battery 1 is constructed by forming a plurality of units which connect four single cells 10 in parallel and then connecting the units with each other in series.
- an orientation of the single cells 10 is interchanged for each unit to reverse positions of the positive electrode terminal 12 and the negative electrode terminal 14 so that the respective units are appropriately connected by the busbar 30 having a flat plate shape.
- the respective single cells 10 constituting the assembled battery 1 may be arranged in a same orientation so that all of the positive electrode terminals 12 and the negative electrode terminals 14 are disposed at same positions as shown in FIG. 8 .
- a busbar 30 E with a stepped shape in a plan view is favorably used. Accordingly, the positive electrode terminals 12 and the negative electrode terminals 14 can be appropriately connected.
- forming a joining projection and a locking biasing portion at both ends of the busbar 30 E enables the electrode terminals of the single cells and the busbar to be connected in an appropriate manner.
- both the positive electrode terminal 12 and the negative electrode terminal 14 are provided at a first end of the single cell 10 in the embodiment described above.
- the structure of a single cell is not limited to that in the embodiment described above and various structures can be adopted.
- a single cell 10 A in which an end of the positive electrode terminal 12 is exposed from a first end of the outer package 11 and an end of the negative electrode terminal 14 is exposed from a second end of the outer package 11 can also be used.
- a connection structure by the busbar 30 is provided on both surfaces of an assembled battery 1 B.
- the total positive busbar 30 A to which only the positive electrode terminal 12 of the single cell 10 A is connected is provided on a first surface of the assembled battery 1 B.
- FIG. 10A the total positive busbar 30 A to which only the positive electrode terminal 12 of the single cell 10 A is connected is provided on a first surface of the assembled battery 1 B.
- the total negative busbar 30 B to which only the negative electrode terminal 14 is connected is provided on a second surface of the assembled battery 1 B. Even when adopting such a structure, by providing each busbar 30 with a joining projection and a locking biasing portion, using the locking biasing portion to cause the electrode terminals 12 and 14 to engage with the busbar 30 , and biasing the electrode terminals 12 and 14 toward the joining projection, welding between the busbar 30 and the electrode terminals 12 and 14 can be performed in an appropriate manner.
- busbar and the electrode terminals are welded to each other using a laser beam in the embodiment described above, means of welding the busbar and the electrode terminals to each other is not limited to laser welding.
- a gap can be prevented from being created between the busbar and the electrode terminal by fixing the busbar and the electrode terminal to each other and biasing the electrode terminal toward the joining projection using the locking biasing portion. Therefore, ultrasonic welding can be performed in a state where welded objects are in contact with each other in an appropriate manner and an occurrence of a poor weld can be preferably prevented.
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Abstract
Description
- The present application claims priority on the basis of Japanese Patent Application No. 2018-58566 filed in Japan on Mar. 26, 2018, the entire contents of which are incorporated herein by reference.
- The present disclosure to an assembled battery in which a plurality of single cells are electrically connected and to a method of manufacturing the assembled battery.
- Assembled batteries using a secondary battery such as a lithium-ion secondary battery or a nickel-hydrogen battery or a storage element such as a capacitor as a single cell and including a plurality of the single cells are growing in importance as vehicle-mounted power supplies and as power supplies for personal computers, mobile phones, and the like. In particular, assembled batteries using a lithium-ion secondary battery which is lightweight and which is capable of producing high energy density as a single cell are preferably used as a high-output power supply to be mounted to a vehicle and the like.
- A single cell constituting such an assembled battery includes an outer package which houses an electrode body and electrode terminals of positive and negative electrodes. For example, an elongated plate-shaped conductive member or the like is used as the electrode terminal. A first end of the electrode terminal is connected to the electrode body inside the outer package and a second end thereof is exposed to the outside of the outer package. The assembled battery is constructed by arranging a plurality of the single cells structured as described above along a prescribed arrangement direction and electrically connecting the electrode terminals of the respective single cells by an inter-cell connecting member (a busbar).
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FIG. 11 is a sectional view illustrating a connection structure of single cells in a conventional assembled battery. In an assembledbattery 100 structured as shown inFIG. 11 , plate-shaped electrode terminals 112 are bent and brought into surface contact with each other between adjacentsingle cells 110. In the assembledbattery 100, a plate-shaped busbar 130 is disposed so as to cover tip portions of therespective electrode terminals 112. In addition, a contact portion between thebusbar 130 and theelectrode terminal 112 is irradiated with a laser beam L from outside of thebusbar 130 and awelded portion 140 is formed so as to straddle thebusbar 130 and theelectrode terminal 112. Accordingly, the respectivesingle cells 110 are electrically connected via thebusbar 130 and theelectrode terminals 112. In the present specification, the “outside of the busbar” is assumed to indicate a side on which single cells are not disposed. - Japanese Patent Application Publication No. 2016-91607 discloses an example of an assembled battery in which each of a plurality of single cells is electrically connected by welding a busbar and electrode terminals to each other.
- However, with the assembled
battery 100 structured as described above, there is a risk that the welding of thebusbar 130 and theelectrode terminals 112 to each other may not be appropriately performed and damage to thesingle cell 110, a poor weld, or the like may occur. - Specifically, when output of the laser beam L during welding of the
busbar 130 and theelectrode terminals 112 to each other is excessively large or thebusbar 130 is excessively thin, since the laser beam L may penetrate thebusbar 130 and theelectrode terminals 112 and end up irradiating thesingle cell 110, there is a risk that thesingle cell 110 may become damaged by heat of the laser beam L. On the other hand, when output of the laser beam L is excessively small or thebusbar 130 is excessively thick, since the laser beam L may not penetrate thebusbar 130 and awelded portion 140 which straddles theelectrode terminal 112 and thebusbar 130 cannot be formed, there is a risk that a connection failure may occur. - In addition, while the
electrode terminals 112 are brought into surface contact with each other between adjacentsingle cells 110 in the assembledbattery 100, if a gap has been created between theelectrode terminals 112, since the laser beam L passes through the gap and irradiates thesingle cell 110, there is a risk that thesingle cell 110 may become damaged by heat of the laser beam L. - The present disclosure has been made in order to solve the problems described above and a primary object thereof is to provide a technique which enables welding of a busbar and an electrode terminal to each other to be appropriately performed and which enables occurrences of damage to a single cell and a poor weld to be preferably prevented.
- In order to achieve the object described above, the present disclosure provides an assembled battery configured as described below.
- In the assembled battery disclosed herein, a plurality of single cells are arranged along a prescribed arrangement direction and each of adjacent single cells is electrically connected by a busbar. The single cell of the assembled battery includes an electrode body, an outer package which houses the electrode body, and an electrode terminal which is a plate-shaped conductive member having a first end connected to the electrode body inside the outer package and a second end protruding to the outside of the outer package. In addition, the busbar includes a plate-shaped base portion which is disposed between the electrode terminals of adjacent single cells and which extends along the arrangement direction, and a plate-shaped joining projection extending along the plate-shaped electrode terminal and a locking biasing portion which locks the electrode terminal and the busbar to each other and which biases the electrode terminal toward the joining projection are formed at both ends of the plate-shaped base portion in the arrangement direction.
- Furthermore, in the assembled battery disclosed herein, the plate-shaped electrode terminal and the plate-shaped joining projection come into surface contact with each other and a tip portion of the electrode terminal and a tip portion of the joining projection are welded to each other.
- In order to solve the problems described above, the present inventors conducted various studies on causes of occurrences of damage to a single cell and a poor weld when welding the electrode terminal and the busbar to each other.
- As a result of the studies, the fact that a state of welding cannot be checked from the outside of the busbar in conventional assembled batteries was considered to be one of the causes of occurrences of the problems described above. For example, in the assembled
battery 100 structure as shown inFIG. 11 , in order to weld thebusbar 130 and theelectrode terminal 112 to each other in an appropriate manner, an irradiation condition of the laser beam L must be adjusted so that the laser beam L penetrates thebusbar 130 but does not penetrate theelectrode terminal 112. However, in the assembledbattery 100, since thebusbar 130 is disposed so as to cover theelectrode terminal 112, the state of welding cannot be checked from the outside of thebusbar 130. As a result, it is difficult to appropriately adjust the irradiation condition of the laser beam L and a likelihood of an occurrence of damage to thesingle cell 110 due to the laser beam L being excessively strong or a connection failure due to the laser beam L being excessively weak increases. - In addition, the present inventors considered that, with conventional techniques, it is difficult to bring welded objects into contact with each other in an appropriate manner. For example, in the assembled
battery 100 shown inFIG. 11 , since theelectrode terminal 112 and thebusbar 130 which are welded objects are not fixed, there is a possibility that a gap is created between the welded objects. Furthermore, with conventional techniques, even when a gap has been created between the welded objects, the creation of the gap cannot be confirmed. Therefore, the possibility that thesingle cell 110 is damaged by the laser beam L passing through a gap of theelectrode terminal 112 increases. - Based on these findings, the present inventors considered that, if a state of welding can be checked when welding an electrode terminal and a busbar to each other and, at the same time, if welded objects can be brought into surface contact with each other in an appropriate manner, the occurrence of various problems that may occur when welding the electrode terminal and the busbar to each other can be prevented. Further studies carried out based on this idea culminated in the conception of a structure of the assembled battery disclosed herein.
- In the assembled battery disclosed herein, a plate-shaped joining projection that extends along an electrode terminal is formed at both ends of a base portion of a busbar. In addition, in the assembled battery, the joining projection of the busbar and an electrode terminal of a single cell are brought into surface contact with each other and a tip portion of the electrode terminal and a tip portion of the joining projection are welded to each other. Since welding can be performed while confirming a state of welding by adopting this structure, the welding of the electrode terminal and the busbar to each other can be performed while appropriately adjusting welding conditions.
- Furthermore, in the assembled battery disclosed herein, since a locking biasing portion which locks the electrode terminal of the single cell and which biases the electrode terminal toward the joining projection is formed on the busbar, the joining projection and the electrode terminal can be brought into surface contact with each other in an appropriate manner. Accordingly, since a gap can be appropriately prevented from being created between members that are welded objects, a situation where a laser beam passes through the gap and damages the single cell can be avoided.
- Therefore, according to the assembled battery disclosed herein, the welding of the busbar and the electrode terminal to each other can be appropriately performed and occurrences of damage to the single cell and a poor weld can be preferably prevented.
- In addition, in a preferable aspect of the assembled battery disclosed herein, a locking biasing portion is provided at each of both side edges of both ends of a plate-shaped base portion.
- Although one locking biasing portion described above need be formed at each of both ends of the base portion, in consideration of bringing the joining projection of the busbar and the electrode terminal of the single cell into surface contact with each other in a more appropriate manner, the locking biasing portion is more favorably formed in plurality at each of both ends of the base portion. For example, since a total of four locking biasing portions can be provided by forming the locking biasing portion at each of both side edges of both ends of the base portion as in the aspect described above, welding of the busbar and the electrode terminal to each other can be performed more preferably and occurrences of damage to the single cell and a poor weld can be more reliably prevented.
- In addition, in a preferable aspect of the assembled battery disclosed herein, the locking biasing portion includes a rising portion which extends along the electrode terminal from both ends of the base portion and an arm portion which covers a tip portion of the electrode terminal and which extends in a curved manner from a tip portion of the rising portion so as to oppose the rising portion.
- When the locking biasing portion including the arm portion which covers the tip portion of the electrode terminal is provided as described above, the tip portion of the electrode terminal and the arm portion can be brought into contact with each other and a height position of the tip portion of the electrode terminal can be aligned with a height position of the tip portion of the joining projection. As a result, the welding of the electrode terminal and the joining projection to each other can be performed more preferably.
- In addition, in a preferable aspect of the assembled battery disclosed herein, an outer package of the single cell is a laminated film.
- Metallic cases, laminated films made of resin, and the like are used as outer packages for housing an electrode body. Among such outer packages, laminated films have various advantages including low material cost. However, since a laminated film is less rigid than a metallic case, there is a problem in that it is difficult to position single cells when arranging the single cells. In contrast, in the assembled battery disclosed herein, since the busbar and the electrode terminal can be locked to each other and fixed by the locking biasing portion, each of the single cells can be readily positioned.
- Furthermore, since a laminated film is less heat-resistant than a metallic case, there is another problem in that, when welding the electrode terminal and the busbar to each other using a laser beam, a single cell may become readily damaged when the outer package is irradiated by the laser beam. However, as described above, in the assembled battery disclosed herein, welding can be performed while checking a state of welding and, at the same time, a gap can be prevented from being created between welded objects. Therefore, a single cell can be appropriately prevented from being irradiated with a laser beam.
- In this manner, according to the assembled battery disclosed herein, the occurrence of various problems that may occur when using a laminated film as the outer package can be preferably prevented.
- In addition, a manufacturing method of an assembled battery is provided as another aspect of the present disclosure.
- The manufacturing method of an assembled battery disclosed herein is a method of manufacturing an assembled battery in which a plurality of single cells are arranged along a prescribed arrangement direction and each of adjacent single cells is electrically connected by a busbar. The single cell of an assembled battery obtained by the manufacturing method described above includes an electrode body, an outer package which houses the electrode body, and an electrode terminal which is a plate-shaped conductive member having a first end connected to the electrode body inside the outer package and a second end protruding to the outside of the outer package. In addition, the busbar includes a plate-shaped base portion which is disposed between the electrode terminals of adjacent single cells and which extends along the arrangement direction, and a plate-shaped joining projection extending along a height direction of the single cell and a locking biasing portion which locks the electrode terminal of the single cell and which biases the electrode terminal toward the joining projection are formed at both ends of the plate-shaped base portion in the arrangement direction.
- Furthermore, the manufacturing method of an assembled battery disclosed herein includes the steps of: bringing the plate-shaped electrode terminal and the plate-shaped joining projection into surface contact with each other, causing the locking biasing portion to lock the electrode terminal of the single cell, and causing the locking biasing portion to bias the electrode terminal toward the joining projection; and welding a tip portion of the electrode terminal and a tip portion of the joining projection to each other.
- In the manufacturing method disclosed herein, the tip portion of the electrode terminal extending along the height direction and the tip portion of the joining projection of the busbar are welded to each other. Accordingly, since welding can be performed while confirming a state of welding, the welding of the electrode terminal and the busbar to each other can be performed in an appropriate manner.
- In addition, using the locking biasing portion, the busbar and the electrode terminal can be fixed to each other and the electrode terminal can be biased toward the joining projection. Therefore, a gap can be prevented from being created between the electrode terminal and the joining projection which are welded objects.
- Consequently, according to the manufacturing method disclosed herein, the welding of the busbar and the electrode terminal to each other can be appropriately performed and occurrences of damage to the single cell and a poor weld can be preferably prevented.
- In addition, in a preferable aspect of the manufacturing method of an assembled battery disclosed herein, the tip portion of the electrode terminal and the tip portion of the joining projection are welded to each other by a laser beam.
- As described earlier, with conventional techniques, various problems including damage to a single cell and a poor weld may occur when performing laser welding. In contrast, with the manufacturing method of an assembled battery disclosed herein, a state of welding of the electrode terminal and the busbar to each other can be checked from the outside and, at the same time, a gap can be prevented from being created between welded objects. Consequently, according to the manufacturing method disclosed herein, occurrences of problems such as damage to a single cell and a poor weld which may occur when performing laser welding can be preferably prevented.
- Moreover, in the manufacturing method disclosed herein, means for welding the electrode terminal and the busbar to each other is not limited to laser welding and various welding means such as ultrasonic welding can be adopted. Even when such welding means other than laser welding is used, since welding can be performed while checking welding positions of the electrode terminal and the busbar from the outside and, at the same time, the electrode terminal and the busbar can be brought into surface contact with each other in an appropriate manner, an effect of preferably preventing the occurrences of a poor weld and the like can be achieved.
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FIG. 1 is a plan view schematically showing an assembled battery according to an embodiment of the present disclosure; -
FIG. 2 is a side view schematically showing a cell used in the assembled battery according to the embodiment of the present disclosure; -
FIG. 3A is a plan view illustrating a procedure of fabricating a busbar used in the assembled battery according to the embodiment of the present disclosure; -
FIG. 3B is a perspective view showing a first end of the busbar used in the assembled battery according to the embodiment of the present disclosure; -
FIG. 4 is a perspective view schematically showing a connection structure between electrode terminals and the busbar of the assembled battery according to the embodiment of the present disclosure; -
FIG. 5 is a sagittal view along V-V inFIG. 1 ; -
FIG. 6 is a perspective view showing a first end of a busbar used in an assembled battery according to another embodiment of the present disclosure; -
FIG. 7 is a plan view showing a first end of a busbar used in an assembled battery according to another embodiment of the present disclosure; -
FIG. 8 is a plan view schematically showing an assembled battery according to another embodiment of the present disclosure; -
FIG. 9 is a side view schematically showing a cell used in an assembled battery according to another embodiment of the present disclosure; -
FIG. 10A is a plan view schematically showing an assembled battery constructed using the cell shown inFIG. 9 ; -
FIG. 10B is a plan view schematically showing an assembled battery constructed using the cell shown inFIG. 9 ; and -
FIG. 11 is a sectional view illustrating a connection structure between single cells in a conventional assembled battery. - Hereinafter, an assembled battery using a lithium-ion secondary battery as a single cell and including a plurality of the lithium-ion secondary batteries will be described as an example of an assembled battery according to an embodiment of the present disclosure. The single cell used in the assembled battery disclosed herein is not limited to a lithium-ion secondary battery and, for example, a secondary battery such as a nickel-hydrogen battery or a storage element such as a capacitor can also be used.
- In the following drawings, members and portions that produce the same effects will be described using the same reference characters. It should be noted that dimensional relationships (length, width, thickness, and the like) shown in the respective drawings do not reflect actual dimensional relationships. In addition, matters required to carry out the present disclosure (for example, a material of an electrode body and a manufacturing method of a single cell) other than those matters specifically described in the present specification can be comprehended as design matters for a person with ordinary skill in the art based on prior art in a relevant technical field.
- 1. Assembled Battery According to Present Embodiment
-
FIG. 1 is a plan view schematically showing an assembled battery according to the present embodiment. It should be noted that, in the respective drawings of the present specification, reference character X indicates “an arrangement direction of a single cell”, reference character Y indicates “a width direction of a single cell”, and reference character Z indicates “a height direction of a single cell”. - (1) Overall Structure
- As shown in
FIG. 1 , an assembledbattery 1 according to the present embodiment includes a plurality of (inFIG. 1 , twenty)single cells 10. Each of thesingle cells 10 is arranged along the arrangement direction X. Abuffer member 60 is sandwiched between the arrangedsingle cells 10. In addition, each of thesingle cells 10 is electrically connected by abusbar 30. Furthermore, in the assembledbattery 1, a constrainingplate 50 is disposed on both outer sides in the arrangement direction X and a constrainingband 52 is stretched across a pair of the constrainingplates 50. Accordingly, thesingle cells 10 arranged along the arrangement direction X are constrained by the pair of constrainingplates 50. - In the present specification, the
single cell 10 arranged at a first end (a left side inFIG. 1 ) in the arrangement direction X will be referred to as a “first single cell”. In addition, single cells subsequent to the “first single cell” will be referred to by sequentially increasing arrangement numbers such as “a second single cell, a third single cell, and so on” toward a second end (a right side inFIG. 1 ). - (2) Single Cell
-
FIG. 2 is a side view schematically showing a cell used in the assembled battery according to the present embodiment. As shown inFIG. 2 , thesingle cell 10 according to the present embodiment includes anouter package 11. In the present embodiment, a laminated film is used as theouter package 11 and an electrode body and an electrolyte are housed inside the laminated film. - Since electrode bodies and electrolytes similar to those used in conventional general lithium-ion secondary batteries can be used without restrictions as the electrode body and the electrolyte, a detailed description thereof will be omitted.
- In addition, the
single cell 10 according to the present embodiment includes a pair ofelectrode terminals electrode terminals single cell 10. Although not illustrated, a first end of theelectrode terminals outer package 11. In addition, a second end of theelectrode terminals outer package 11 and extends along the height direction Z as shown inFIG. 2 . - An electrode terminal indicated by
reference character 12 inFIG. 2 is a positive electrode terminal connected to the positive electrode of the electrode body. In addition, an electrode terminal indicated byreference character 14 is a negative electrode terminal connected to the negative electrode of the electrode body. Furthermore, theouter package 11 of thesingle cell 10 according to the present embodiment is provided with aninsulated holder 17 which holds theelectrode terminals outer package 11. - (3) Busbar
- As shown in
FIG. 1 , the assembledbattery 1 according to the present embodiment includes a plurality of plate-shapedbusbars 30 which extend along the arrangement direction X of thesingle cells 10. In addition, each of the adjacentsingle cells 10 is sequentially connected by thebusbars 30. Specifically, in the assembledbattery 1, positive electrode terminals 12 (and negative electrode terminals 14) of the first to fourthsingle cells 10 are connected by the busbars 30 (each of the first to fourthsingle cells 10 is connected in parallel). Furthermore, in the fifth to eighthsingle cells 10, eachsingle cell 10 is disposed in opposite orientations so that positions of thepositive electrode terminals 12 and thenegative electrode terminals 14 are reversed relative to the first to fourthsingle cells 10. Accordingly, thepositive electrode terminal 12 of the fourthsingle cell 10 and thenegative electrode terminal 14 of the fifthsingle cell 10 are connected by thebusbar 30 and, at the same time, the fifth to eighthsingle cells 10 are connected in parallel. In this manner, the assembledbattery 1 according to the present embodiment is constructed by forming a plurality of units which connect foursingle cells 10 in parallel and then connecting the units with each other in series. - A busbar (a total positive busbar) 30A which is only connected to the
positive electrode terminal 12 of the firstsingle cell 10 is provided at the first end in the arrangement direction X, and a busbar (a total negative busbar) 30B which is only connected to thenegative electrode terminal 14 of the 20thsingle cell 10 is provided at the second end in the arrangement direction X. The totalpositive busbar 30A and the totalnegative busbar 30B are connected to an external device such as a motor of a vehicle. - Next, a specific structure of the
busbar 30 used in the assembledbattery 1 according to the present embodiment will be described. Thebusbar 30 is fabricated by die-cutting a conductive plate (for example, an aluminum plate or a copper plate) having prescribed rigidity and bending the die-cut conductive plate. Specifically, first, a notchedportion 35A is formed by die-cutting a center of both ends of aconductive plate 35 such as that shown inFIG. 3A . Subsequently, theconductive plate 35 is bent along dotted line portions L1 to L14 shown inFIG. 3A to fabricate thebusbar 30 according to the present embodiment. - As shown in
FIG. 3B , thebusbar 30 fabricated in this manner includes abase portion 32 which extends along the arrangement direction X of thesingle cells 10. In addition, a joiningprojection 36 which extends along the height direction Z is formed at the center of both ends of thebase portion 32. - Furthermore, in the
busbar 30, alocking biasing portion 38 with an inverted U-shape is formed at each of both side edges of both ends of thebase portion 32. Thelocking biasing portion 38 with an inverted U-shape includes a risingportion 38 a which extends along the height direction Z (the direction in which theelectrode terminals arm portion 38 b which extends in a curved manner from a tip portion of the risingportion 38 a so as to oppose the risingportion 38 a. In addition, an insertedportion 38 c which is enclosed by the risingportion 38 a and thearm portion 38 b is formed in thelocking biasing portion 38 of thebusbar 30. In the present embodiment, thearm portion 38 b is bent so that respective positions in the height direction X of an upper portion of the insertedportion 38 c and atip portion 36 a of the joiningprojection 36 are aligned with each other. - (4) Connection Structure Between Electrode Terminal and Busbar
- Next, a connection structure between the
electrode terminals busbar 30 in the assembledbattery 1 according to the present embodiment will be described with reference toFIGS. 4 and 5 .FIG. 4 is a perspective view schematically showing electrode terminals and a busbar of the assembled battery according to the present embodiment, andFIG. 5 is a sagittal view along V-V inFIG. 1 . - As described above, the
busbar 30 according to the present embodiment includes thebase portion 32 which extends along the arrangement direction X, the joiningprojection 36 which extends along the height direction Z from the center of both ends of thebase portion 32, and thelocking biasing portion 38 with an inverted U-shape which is formed at both side edges of both ends of thebase portion 32. - When connecting the
electrode terminals single cell 10 using thebusbar 30, first, thebase portion 32 of thebusbar 30 is disposed between therespective electrode terminals single cells 10 and theelectrode terminals portions 38 c (refer toFIG. 3 ) of thelocking biasing portions 38 formed at both ends of thebusbar 30. Accordingly, theelectrode terminals locking biasing portions 38 and thebusbar 30 and theelectrode terminals - In addition, in the present embodiment, the
arm portion 38 b which is curved so as to oppose the risingportion 38 a is formed and theelectrode terminals arm portion 38 b. Accordingly, theelectrode terminals single cell 10 are biased toward the joiningprojection 36. As a result, theelectrode terminals projection 36 of thebusbar 30 can be brought into surface contact with each other in an appropriate manner. - Furthermore, in the present embodiment, the
arm portion 38 b of thelocking biasing portion 38 is formed so as to covertip portions electrode terminals tip portions electrode terminals arm portion 38 b of thelocking biasing portion 38. Accordingly, a height position of thetip portion 36 a of the joiningprojection 36 of thebusbar 30 and height positions of thetip portions electrode terminals - Next, in the present embodiment, the
tip portion 36 a of the joiningprojection 36 and thetip portions electrode terminals portion 40 is formed so as to straddle the joiningprojection 36 and theelectrode terminals busbar 30 and theelectrode terminals - As described above, in the assembled
battery 1 according to the present embodiment, the joiningprojection 36 which comes into surface contact with theelectrode terminals busbar 30. In addition, thetip portion 36 a of the joiningprojection 36 and thetip portions electrode terminals electrode terminals busbar 30. Therefore, according to the present embodiment, the welding of thebusbar 30 and theelectrode terminals single cell 10, a poor weld, and the like can be preferably prevented. - In addition, in the present embodiment, the
electrode terminals single cell 10 and the joiningprojection 36 of thebusbar 30 are locked by thelocking biasing portion 38 and, at the same time, theelectrode terminals projection 36 by thelocking biasing portion 38. Accordingly, a gap can be prevented from being created between theelectrode terminals projection 36 which are welded objects. As a result, a situation where a laser beam passes through a gap between welded objects and ends up irradiating thesingle cells 10 can be preferably prevented. - As described above, according to the present embodiment, since the welding of the
busbar 30 and theelectrode terminals single cell 10 and a poor weld can be preferably prevented. - Furthermore, in the present embodiment, since the
arm portion 38 b of thelocking biasing portion 38 is formed so as to covertip portions electrode terminals tip portions electrode terminals tip portion 36 a of the joiningprojection 36 can be readily aligned with each other. Accordingly, the weldedportion 40 which straddles thetip portions electrode terminals tip portion 36 a of the joiningprojection 36 can be readily formed. - In addition, in the present embodiment, a laminated film is used as the
outer package 11 of thesingle cell 10. While the laminated film has various advantages including low material cost, since the laminated film is less rigid than a metallic battery case, there is a problem in that it is difficult to position eachsingle cell 10. In contrast, in the present embodiment, since theelectrode terminals single cell 10 are fixed via thebusbar 30 having thelocking biasing portion 38, eachsingle cell 10 can be readily positioned. - Furthermore, since the laminated film is less heat-resistant than a metallic case, there is another problem in that the
single cell 10 may be readily damageable when the laminated film is irradiated by a laser beam. However, in the present embodiment, as described above, since theelectrode terminals projection 36 by thearm portion 38 b of thelocking biasing portion 38, a gap can be prevented from being created between theelectrode terminals projection 36. Accordingly, a situation where thesingle cells 10 are irradiated by a laser beam having passed through a gap between members that are welded objects can be appropriately prevented. - As described above, according to the present embodiment, problems that arise from the use of a laminated film as the
outer package 11 can be appropriately solved and only advantages such as a low material cost can be enjoyed. - It should be noted that the outer package used in the assembled battery disclosed herein is not limited to a laminated film and a battery case or the like made of a metal such as aluminum may also be used.
- In addition, when manufacturing a general assembled battery, a fixing jig for preventing a displacement of an arrangement position of each single cell is used. However, when manufacturing the assembled
battery 1 according to the present embodiment, since eachsingle cell 10 can be fixed via thebusbar 30 having thelocking biasing portion 38, there is no longer a need to use a fixing jig. Therefore, the present embodiment can also contribute toward reducing equipment expenses. - 2. Assembled Battery According to Other Embodiments
- While the assembled
battery 1 according to an embodiment of the present disclosure has been described above, the present disclosure is not limited to the described embodiment and various modifications can be made thereto. - (1) Structure of Busbar
- As shown in
FIG. 4 , thebusbar 30 according to the embodiment described above includes fourlocking biasing portions 38. However, the locking biasing portion of the busbar need only be capable of locking the electrode terminals and the busbar to each other and biasing the electrode terminals toward the joining projection, and the number of locking biasing portions is not limited to that in the embodiment described above. - For example, in a
busbar 30C shown inFIG. 6 , onelocking biasing portion 38 is formed at the center of each of both ends of thebase portion 32 and, at the same time, the joiningprojection 36 is formed which extends along the height direction Z from both side edges of both ends of thebase portion 32. Even when using thebusbar 30C having a pair of locking biasingportions 38 formed at both ends, the electrode terminals and thebusbar 30C can be locked to each other by thelocking biasing portions 38 and, at the same time, the electrode terminals can be biased toward the joiningprojection 36 by thearm portions 38 b of thelocking biasing portions 38. - However, forming the
locking biasing portion 38 on each of both side edges of both ends of thebase portion 32 as in thebusbar 30 shown inFIG. 3B is favorable because thebusbar 30 and the electrode terminals can be fixed to each other in a more preferable manner. - In addition, a shape of the
locking biasing portion 38 is similarly not limited to that in the embodiment described above. - For example, the
locking biasing portion 38 of thebusbar 30 according to the embodiment described above includes thearm portion 38 b which is curved so as to cover thetip portions electrode terminals FIG. 4 . However, even when forming thelocking biasing portion 38 including anarm portion 38 d which is curved so as to cover both side edges of theelectrode terminals FIG. 7 , theelectrode terminals busbar 30D can be locked to each other and theelectrode terminals projection 36 by thearm portion 38 d. - However, providing the
arm portion 38 b which is curved so as to cover thetip portions electrode terminals tip portions electrode terminals tip portion 36 a of the joiningprojection 36 can be aligned with each other and welding of theelectrode terminals projection 36 can be readily performed. - (2) Arrangement of Respective Single Cells
- In addition, an arrangement structure of the respective single cells constituting the assembled battery is similarly not limited to that in the embodiment described above and can be changed as deemed appropriate in accordance with a purpose of the assembled battery and a structure of the single cells.
- For example, the assembled
battery 1 according to the embodiment described above is constructed by forming a plurality of units which connect foursingle cells 10 in parallel and then connecting the units with each other in series. In this assembledbattery 1, an orientation of thesingle cells 10 is interchanged for each unit to reverse positions of thepositive electrode terminal 12 and thenegative electrode terminal 14 so that the respective units are appropriately connected by thebusbar 30 having a flat plate shape. - However, the respective
single cells 10 constituting the assembledbattery 1 may be arranged in a same orientation so that all of thepositive electrode terminals 12 and thenegative electrode terminals 14 are disposed at same positions as shown inFIG. 8 . In the case of an assembledbattery 1A structured in this manner, when respectively connecting the fourth and fifthsingle cells 10, the eighth and ninthsingle cells 10, the twelfth and thirteenthsingle cells 10, and the sixteenth and seventeenthsingle cells 10 with each other, abusbar 30E with a stepped shape in a plan view is favorably used. Accordingly, thepositive electrode terminals 12 and thenegative electrode terminals 14 can be appropriately connected. In addition, even when using thebusbar 30E structured in this manner, forming a joining projection and a locking biasing portion at both ends of thebusbar 30E enables the electrode terminals of the single cells and the busbar to be connected in an appropriate manner. - Furthermore, as shown in
FIG. 2 , both thepositive electrode terminal 12 and thenegative electrode terminal 14 are provided at a first end of thesingle cell 10 in the embodiment described above. However, the structure of a single cell is not limited to that in the embodiment described above and various structures can be adopted. - For example, as shown in
FIG. 9 , asingle cell 10A in which an end of thepositive electrode terminal 12 is exposed from a first end of theouter package 11 and an end of thenegative electrode terminal 14 is exposed from a second end of theouter package 11 can also be used. When using thesingle cell 10A structured as described above, as shown inFIGS. 10A and 10B , a connection structure by thebusbar 30 is provided on both surfaces of an assembledbattery 1B. Specifically, as shown inFIG. 10A , the totalpositive busbar 30A to which only thepositive electrode terminal 12 of thesingle cell 10A is connected is provided on a first surface of the assembledbattery 1B. In addition, as shown inFIG. 10B , the totalnegative busbar 30B to which only thenegative electrode terminal 14 is connected is provided on a second surface of the assembledbattery 1B. Even when adopting such a structure, by providing eachbusbar 30 with a joining projection and a locking biasing portion, using the locking biasing portion to cause theelectrode terminals busbar 30, and biasing theelectrode terminals busbar 30 and theelectrode terminals - (3) Means of Welding Busbar and Electrode Terminals to Each Other
- In addition, while the busbar and the electrode terminals are welded to each other using a laser beam in the embodiment described above, means of welding the busbar and the electrode terminals to each other is not limited to laser welding.
- For example, being unable to check welding positions of a busbar and an electrode terminal as in prior art when welding the busbar and the electrode terminal to each other using ultrasonic waves creates a risk of causing the welding positions of the busbar and the electrode terminal to shift and preventing ultrasonic welding from being appropriately performed. In contrast, in the assembled battery disclosed herein, ultrasonic welding can be appropriately performed while checking welding positions of the busbar and the electrode terminal.
- In addition, in the assembled battery disclosed herein, a gap can be prevented from being created between the busbar and the electrode terminal by fixing the busbar and the electrode terminal to each other and biasing the electrode terminal toward the joining projection using the locking biasing portion. Therefore, ultrasonic welding can be performed in a state where welded objects are in contact with each other in an appropriate manner and an occurrence of a poor weld can be preferably prevented.
- Even when welding means other than laser welding and ultrasonic welding is used, similarly, since welding can be appropriately performed while checking welding positions and, at the same time, the electrode terminal and the busbar can be brought into surface contact with each other in an appropriate manner, occurrences of various problems such as a poor weld can be preferably prevented.
- While specific examples of the present disclosure have been described in detail, such specific examples are merely illustrative and are not intended to limit the scope of claims. Techniques described in the scope of claims include various modifications and changes made to the specific examples illustrated above.
Claims (6)
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US17/244,204 US11233295B2 (en) | 2018-03-26 | 2021-04-29 | Assembled battery and manufacturing method of assembled battery |
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JP2018058566A JP7041842B2 (en) | 2018-03-26 | 2018-03-26 | Assembled battery and manufacturing method of assembled battery |
JP2018-058566 | 2018-03-26 |
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US17/244,204 Active US11233295B2 (en) | 2018-03-26 | 2021-04-29 | Assembled battery and manufacturing method of assembled battery |
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Cited By (4)
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DE102019127703A1 (en) * | 2019-11-04 | 2021-05-06 | HELLA GmbH & Co. KGaA | Cell composite, comprising a plurality of energy storage cells and a method for its production |
US20210296715A1 (en) * | 2020-03-17 | 2021-09-23 | Aurora Flight Sciences Corporation, a subsidiary of The Boeing Company | Battery cooling systems and methods |
DE102021129965A1 (en) | 2021-11-17 | 2023-05-17 | HELLA GmbH & Co. KGaA | Energy store, method for producing an energy store and vehicle |
CN117594860A (en) * | 2024-01-19 | 2024-02-23 | 新立讯科技股份有限公司 | New energy automobile process guidance method and system based on DLP |
Families Citing this family (3)
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CN112034363B (en) * | 2020-09-04 | 2023-04-14 | 超威电源集团有限公司 | Method for detecting single lattice lag of sealed lead-acid storage battery |
KR20220045851A (en) * | 2020-10-06 | 2022-04-13 | 주식회사 엘지에너지솔루션 | Battery module and battery pack including the same and vehicle including the same |
DE102022004087A1 (en) | 2022-10-31 | 2024-05-02 | Mercedes-Benz Group AG | Battery module for an electrical energy storage device, electrical energy storage device and motor vehicle |
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JP2568023B2 (en) * | 1993-01-18 | 1996-12-25 | 日本碍子株式会社 | Connection terminals and connection structure for single cells |
US6660430B1 (en) | 2000-01-24 | 2003-12-09 | Mitsubishi Denki Kabushiki Kaisha | Package for nonaqueous electrolyte cell and cell comprising the same |
FR2888669B1 (en) | 2005-07-13 | 2010-08-20 | Batscap Sa | INTERCONNECTION SYSTEM FOR AN ENERGY STORAGE ASSEMBLY |
KR101050318B1 (en) | 2009-04-16 | 2011-07-19 | 에스비리모티브 주식회사 | Secondary battery module |
JP5544931B2 (en) | 2010-03-02 | 2014-07-09 | 株式会社デンソー | Laminated cell battery structure |
KR101156527B1 (en) | 2010-06-01 | 2012-06-21 | 에스비리모티브 주식회사 | Battery pack |
JP5761742B2 (en) | 2011-03-31 | 2015-08-12 | Necエナジーデバイス株式会社 | Battery pack |
JP6034881B2 (en) * | 2013-01-04 | 2016-11-30 | 日立オートモティブシステムズ株式会社 | Assembled battery |
US9799872B2 (en) | 2013-01-18 | 2017-10-24 | Samsung Sdi Co., Ltd. | Battery module |
US9698402B2 (en) * | 2014-03-13 | 2017-07-04 | Ford Global Technologies, Llc | Method of welding a bus bar to battery cell terminals |
JP6380005B2 (en) * | 2014-10-29 | 2018-08-29 | 株式会社デンソー | Battery pack and manufacturing method thereof |
US10230140B2 (en) | 2016-09-27 | 2019-03-12 | GM Global Technology Operations LLC | Vehicle battery cooling system |
-
2018
- 2018-03-26 JP JP2018058566A patent/JP7041842B2/en active Active
-
2019
- 2019-03-14 US US16/353,501 patent/US20190296313A1/en not_active Abandoned
- 2019-03-22 CN CN201910222365.1A patent/CN110364670B/en active Active
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2021
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019127703A1 (en) * | 2019-11-04 | 2021-05-06 | HELLA GmbH & Co. KGaA | Cell composite, comprising a plurality of energy storage cells and a method for its production |
US20210296715A1 (en) * | 2020-03-17 | 2021-09-23 | Aurora Flight Sciences Corporation, a subsidiary of The Boeing Company | Battery cooling systems and methods |
US11646461B2 (en) * | 2020-03-17 | 2023-05-09 | The Boeing Company | Battery cooling systems and methods |
DE102021129965A1 (en) | 2021-11-17 | 2023-05-17 | HELLA GmbH & Co. KGaA | Energy store, method for producing an energy store and vehicle |
WO2023088818A1 (en) | 2021-11-17 | 2023-05-25 | HELLA GmbH & Co. KGaA | Energy store, method for producing an energy store and vehicle |
CN117594860A (en) * | 2024-01-19 | 2024-02-23 | 新立讯科技股份有限公司 | New energy automobile process guidance method and system based on DLP |
Also Published As
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CN110364670A (en) | 2019-10-22 |
US20210249737A1 (en) | 2021-08-12 |
JP2019169452A (en) | 2019-10-03 |
JP7041842B2 (en) | 2022-03-25 |
CN110364670B (en) | 2022-02-11 |
US11233295B2 (en) | 2022-01-25 |
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