WO2016181608A1 - 組電池 - Google Patents
組電池 Download PDFInfo
- Publication number
- WO2016181608A1 WO2016181608A1 PCT/JP2016/001963 JP2016001963W WO2016181608A1 WO 2016181608 A1 WO2016181608 A1 WO 2016181608A1 JP 2016001963 W JP2016001963 W JP 2016001963W WO 2016181608 A1 WO2016181608 A1 WO 2016181608A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bus bar
- negative electrode
- positive electrode
- positive
- side bus
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 description 12
- 239000005001 laminate film Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000003475 lamination Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—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
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—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
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- 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
-
- 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
- This disclosure relates to an assembled battery.
- the assembled battery is configured by connecting a plurality of single cells in series, in parallel, or in series-parallel using a bus bar or the like.
- Patent Document 1 discloses an assembled battery in which a series connection between cell units and a parallel connection between single cells are simultaneously achieved using a bus bar having a pair of a series weld part and a parallel weld part. ing.
- an assembled battery that has a simple structure and is easy to assemble is demanded from the viewpoint of improving productivity. Furthermore, it is desirable that the assembled battery has a structure with a small number of parts and a high degree of freedom in connection of single cells.
- An assembled battery that is one embodiment of the present disclosure is a flat-shaped main body, a positive electrode tab drawn from one lateral end of one surface of the main body, and a second lateral end of one surface of the main body.
- an assembled battery having a simple structure and easy assembly can be provided.
- FIG. 1 is a perspective view of an assembled battery which is an example of an embodiment.
- FIG. 2 is a perspective view of a unit cell constituting an assembled battery which is an example of the embodiment.
- FIG. 3 is a perspective view showing parallel blocks of a battery stack as an example of the embodiment.
- 4A is a cross-sectional view taken along line AA in FIG. 3, and
- FIG. 4B is a cross-sectional view taken along line BB in FIG.
- FIG. 5 is an exploded perspective view of an assembled battery (parallel block) as an example of the embodiment.
- FIG. 6 is an enlarged view of a main part of an assembled battery which is an example of the embodiment.
- FIG. 7 is a diagram illustrating an assembled battery which is another example of the embodiment.
- FIG. 1 is a perspective view of an assembled battery which is an example of an embodiment.
- FIG. 2 is a perspective view of a unit cell constituting an assembled battery which is an example of the embodiment.
- FIG. 3 is a perspective view
- FIG. 8 is a cross-sectional view showing an assembled battery (parallel block) which is another example of the embodiment.
- FIG. 9 is a perspective view showing an assembled battery (parallel block) as another example of the embodiment.
- FIG. 10 is a perspective view showing an assembled battery (parallel block) as another example of the embodiment.
- FIG. 1 is a perspective view showing the entire assembled battery 10
- FIG. 2 is a perspective view of a unit cell 20 constituting the assembled battery 10 (in addition, a cross section of a portion surrounded by a one-dot chain line is shown).
- 3 to 5 are diagrams showing the parallel block 13 of the battery stack 11.
- FIG. 6 is an enlarged view showing the connection portion 70 between the positive electrode side bus bar 50 and the negative electrode side bus bar 60 and the vicinity thereof.
- the battery pack 10 includes a battery stack 11 formed by stacking a plurality of unit cells 20 in the same direction, a positive-side bus bar 50 connected to a positive electrode tab 22 of the unit cell 20, A negative electrode side bus bar 60 connected to the negative electrode tab 23 of the battery 20.
- the assembled battery 10 is connected to the positive electrode side bus bar 50 connected to the positive electrode tab 22 of one unit cell 20 and the negative electrode tab 23 of the other unit cell 20 among the adjacent unit cells 20 of the battery stack 11.
- the negative electrode side bus bar 60 is connected to each other on one surface of the battery stack 11.
- the battery stack 11 includes a plurality of parallel blocks 13.
- the parallel block 13 includes at least two adjacent unit cells 20 connected in parallel.
- the parallel block 13 was formed by overlapping the positive electrode tab stacking portion 14 formed by overlapping the positive electrode tabs 22 of the single cells 20 constituting the block and the negative electrode tab 23 of the single cells 20.
- a negative electrode tab laminate portion 15 The positive electrode side bus bar 50 is connected to the positive electrode tab laminate portion 14, and the negative electrode side bus bar 60 is connected to the negative electrode tab laminate portion 15.
- the assembled battery 10 is configured by connecting a plurality of parallel blocks 13 in series using a positive electrode side bus bar 50 and a negative electrode side bus bar 60. That is, the connection form of the unit cells 20 in the assembled battery 10 is a series-parallel connection in which a series connection and a parallel connection are combined. However, the assembled battery 10 does not have the parallel connection of the single cells 20 and may have a structure not including the parallel block 13. In this case, the positive electrode side bus bar 50 is electrically connected only to the positive electrode tab 22 of one unit cell 20, and the negative electrode side bus bar 60 is electrically connected only to the negative electrode tab 23 of one unit cell 20. Connects the single cells 20 constituting the battery stack 11 in series.
- the assembled battery 10 has, for example, a substantially rectangular parallelepiped shape, extends longer in the vertical direction than in the horizontal direction, and satisfies the vertical length ⁇ horizontal length ⁇ vertical length.
- the vertical direction in the assembled battery 10 and its constituent elements means the direction in which the positive electrode tab 22 and the negative electrode tab 23 are drawn from the main body 21 of the unit cell 20, and the up-down direction means that the unit cells 20 are stacked.
- the horizontal direction is a direction orthogonal to the vertical direction and the vertical direction.
- the length of the assembled battery 10 in the vertical direction is mainly determined by the thickness of the unit cells 20 constituting the battery stack 11 and the number of layers of the unit cells 20, and becomes longer as the number of layers is increased.
- the assembled battery 10 includes, for example, a case that covers the periphery of the battery stack 11, an output terminal for taking out electric power from the assembled battery 10, and the like (none of which are shown).
- a connection portion 70 between the positive electrode side bus bar 50 and the negative electrode side bus bar 60 that is an electrical connection portion between the parallel blocks 13 is simply on the side surface 12 that is one surface of the battery stack 11. It is preferable that a plurality of batteries 20 are formed side by side in the vertical direction, which is the stacking direction of the batteries 20.
- the side surface 12 of the battery stack 11 is one end surface in the vertical direction along the vertical direction.
- the assembled battery 10 preferably includes a conductive member 71 sandwiched between the positive electrode side bus bar 50 and the negative electrode side bus bar 60.
- the conductive member 71 has a voltage monitoring terminal portion 72 protruding from between the bus bars.
- the unit cell 20 constituting the assembled battery 10 includes a flat main body portion 21, a positive electrode tab 22 drawn from one end side in the lateral direction of a side surface 28 that is one surface of the main body portion 21, and It has a negative electrode tab 23 drawn out from the other lateral end of the side surface 28 of the main body 21.
- the unit cell 20 is a laminate battery including an exterior body 26 composed of two laminate films 24 and 25.
- the laminate film 24 side is “upper”, and the laminate film 25 side is “lower”.
- the laminate films 24 and 25 it is preferable to use a film in which a resin layer is formed on both surfaces of a metal layer.
- the metal layer is, for example, an aluminum layer, and has a function of preventing permeation of moisture and the like.
- the unit cell 20 is not limited to a laminated battery, and may be a prismatic battery including a prismatic metal case, for example.
- the unit cell 20 is a secondary battery, for example, a lithium ion secondary battery, and includes, for example, a power generation element including an electrode body and an electrolyte, and an exterior body 26 that houses the power generation element.
- An example of the electrode body is a wound electrode body in which a positive electrode and a negative electrode are wound through a separator.
- the positive electrode tab 22 is connected to the positive electrode, and the negative electrode tab 23 is connected to the negative electrode.
- the exterior body 26 has a main body portion 21 and a seal portion 27, and a power generation element is accommodated in the main body portion 21.
- a flat, substantially rectangular parallelepiped main body portion 21 is formed on the laminate film 24 constituting the exterior body 26.
- the main body 21 is formed, for example, by drawing the laminate film 24 so as to be convex on the opposite side of the laminate film 25.
- the seal portion 27 is formed around the main body portion 21 by joining edge portions of the laminate films 24 and 25 (for example, heat sealing).
- the seal portion 27 formed along the vertical direction of the unit cell 20 is bent upward so as to overlap the side surface 29 which is the end surface in the horizontal direction of the main body portion 21.
- the width of the seal portion 27 is preferably the same as or slightly shorter than the length of the side surface 29 in the vertical direction.
- the positive electrode tab 22 and the negative electrode tab 23 are pulled out from the same surface (side surface 28) of the main body 21 as described above.
- the side surface 28 is one longitudinal end surface of the main body 21 along the thickness direction of the unit cell 20.
- Each tab passes through a seal portion 27 extending in the vertical direction from the lower portion of the side surface 28 (hereinafter, sometimes referred to as “seal portion 27x” to be distinguished from other seal portions 27), and the tip of the seal portion 27x (one end in the vertical direction). ) Extending vertically.
- the seal portion 27x is formed substantially perpendicular to the side surface 28 with each tab sandwiched between the laminate films 24 and 25, for example.
- the positive electrode tab 22 and the negative electrode tab 23 are thin plate-like conductive members, and are arranged side by side in the horizontal direction of the unit cell 20. Between the positive electrode tab 22 and the negative electrode tab 23, the space which can form the connection part 70 of a bus bar is provided.
- each tab it is preferable that at least portions extending from the front end of the seal portion 27x to the outside of the exterior body 26 (hereinafter sometimes referred to as “exposed portions”) have the same shape and the same dimensions.
- the lateral length of each tab is less than 50% of the lateral length of the main body 21, and preferably 20 to 40%.
- the vertical length of the exposed portion of each tab is a length that does not hinder connection with each bus bar, and is, for example, approximately the same as the width of each bus bar.
- the unit cell 20 (unit cell 20b) arranged below the parallel block 13 is different from the unit cell 20 (unit cell 20a) arranged above the parallel block 13 in the shape of the exposed portion of each tab. (See FIG. 5 etc.).
- the positive electrode tab 22b and the negative electrode tab 23b of the unit cell 20b are bent upward in the vicinity of the seal portion 27b and then bent again to one side in the vertical direction (the opposite side to the main body portion 21b).
- the cells may be appropriately cut to produce the unit cells 20a, 20b and the like. Moreover, you may cut an excess exposed part after formation of each tab lamination
- the configuration of the assembled battery 10 will be described in more detail with reference to FIGS. 3 to 6 as appropriate.
- 3 to 5 of the two unit cells 20 constituting the parallel block 13, the unit cell 20 disposed on the upper side is referred to as “unit cell 20a”, and the unit cell 20 disposed on the lower side is represented by “unit cell 20b”.
- a and b are added to the components of each battery, respectively.
- the stacked parallel blocks 13 are referred to as “parallel blocks 13 ⁇ / b> A, 13 ⁇ / b> B, 13 ⁇ / b> C” in order from the top, and A, B, and C are given to the components of each block, respectively.
- the battery stack 11 is configured by using a plurality of unit cells 20 in which the main body 21 has the same shape and the same dimensions.
- the number of unit cells 20 constituting the battery stack 11 is not particularly limited, but is preferably four or more.
- the battery stack 11 illustrated in FIG. 1 includes eight unit cells 20 and includes four parallel blocks 13 configured by connecting these unit cells 20 two by two in parallel.
- the battery stack 11 is configured by stacking a plurality of unit cells 20 in the same direction as described above. Specifically, each battery cell 20 is placed in a state in which the side surfaces 28 of the main body 21 from which the positive electrode tab 22 and the negative electrode tab 23 are drawn face in the same direction, and the positions of both ends in the horizontal direction and both ends in the vertical direction are matched. Are stacked.
- Each unit cell 20 is laminated with the laminate film 24 on which the main body 21 is formed facing upward.
- the parallel block 13 includes two unit cells 20a and 20b that are connected to each other in parallel by forming a positive electrode tab stacked portion 14 and a negative electrode tab stacked portion 15.
- the unit cells 20a and 20b are stacked in the same direction as described above, and the positive electrode tabs 22a and 22b and the negative electrode tabs 23a and 23b arranged in the vertical direction are electrically connected to each other, and the positive electrode tab stacked unit 14 and Each of the negative electrode tab laminate portions 15 is formed.
- the parallel block 13 includes a positive electrode side bus bar 50 connected to the positive electrode tab stacking portion 14 and a negative electrode side bus bar 60 connected to the negative electrode tab stacking portion 15.
- it is suitable for the parallel block 13 to be equipped with the frame bodies 30 and 40 attached to the cell 20a, 20b, respectively.
- the positive electrode tab 22a and the negative electrode tab 23a of the unit cell 20a extend from the tip of the seal portion 27a to the outside of the exterior body 26 and extend straight in the vertical direction.
- the positive electrode tab 22b of the unit cell 20b extends in the vertical direction to the position where it is bent toward the positive electrode tab 22a side of the unit cell 20a in the vicinity of the seal portion 27b.
- the positive electrode tab 22b is bent to the opposite side of the main body 21a at a position in contact with the lower surface of the positive electrode tab 22a, and extends substantially parallel to the positive electrode tab 22a along the vertical direction from the bent portion to the tip. And the lower surface of the positive electrode tab 22a and the upper surface of the positive electrode tab 22b are joined, and the positive electrode tab lamination
- the negative electrode tab 23b of the unit cell 20b extends in the vertical direction to the position where the negative electrode tab 23a of the unit cell 20a is bent and contacted with the negative electrode tab 23a in the vicinity of the seal portion 27b.
- the negative electrode tab 23b is bent to the opposite side of the main body portion 21a at a position in contact with the lower surface of the negative electrode tab 23a, and extends substantially parallel to the negative electrode tab 23a along the vertical direction from the bent portion to the distal end portion. And the lower surface of the negative electrode tab 23a and the upper surface of the negative electrode tab 23b are joined, and the negative electrode tab lamination
- the tab laminated portions are preferably formed side by side in the horizontal direction at the substantially vertical central portion of the parallel block 13.
- the positive electrode tab stacking portion 14 is formed, for example, by superposing and welding the positive electrode tab 22a of the unit cell 20a and the positive electrode tab 22b of the unit cell 20b.
- the welding method is not particularly limited, and examples thereof include ultrasonic welding and laser welding.
- the positive electrode tabs 22a and 22b and the positive electrode side bus bar 50 are superposed on each other and ultrasonically welded to form the positive electrode tab laminated portion 14 and simultaneously connect the positive electrode side bus bar 50 to the positive electrode tab laminated portion 14.
- the negative electrode tab laminated portion 15 can also be formed by overlapping and welding the negative electrode tab 23a and the negative electrode tab 23b.
- tabs can also be formed by fastening the tabs with a fastening member such as a bolt, for example, by a method other than welding.
- the frame bodies 30 and 40 surround the four sides of the main body portions 21a and 21b, respectively, and protect the unit cells 20a and 20b, for example, and have a function of binding the batteries.
- the frame 30 has two horizontal bars 31x and 31y and two vertical bars 32, and is attached from the upper side of the unit cell 20a.
- the horizontal rails 31x and 31y are placed on the seal portions 27a formed at both ends in the vertical direction of the unit cell 20a and arranged along the vertical end surface (side surface 28) of the main body portion 21a, and the vertical rails 32 are arranged on the main body portion 21a. It is arrange
- the horizontal rails 31x and 31y are formed with slits (not shown) for avoiding interference with both ends of the bent seal portion 27 in the vertical direction.
- bonding with the frame 40 is provided in the horizontal direction both ends (longitudinal direction both ends) of the crosspieces 31x and 31y.
- the frame body 40 has two horizontal bars 41x and 41y and two vertical bars 42, and is attached from the upper side of the unit cell 20b.
- Each frame body is couple
- the engaging part 45 has a hook
- the engaging part 35 has a recess into which the hook is inserted and hooked.
- each crosspiece of the frame 30 is longer than the thickness (vertical length) of the main body portion 21a, and the upper end surface of each crosspiece is positioned above the upper end surface of the main body portion 21a. is there.
- the vertical beam 32 has, for example, a substantially L-shaped cross section, and a part of the vertical beam 32 projects on the main body portion 21a.
- the frame body 40 also has an upper end surface of each beam positioned above the upper end surface of the main body portion 21 b, and a part of the vertical beam 42 projects on the main body portion 21 b.
- the unit cell 20a is sandwiched from above and below by the frame bodies 30 and 40 coupled to each other.
- the unit cell 20b is sandwiched between the frame body 40 and the frame body 30 of another parallel block 13 disposed on the lower side.
- the hook is provided only in the engaging portion 45, but the engaging portion 35 is also provided with a hook that can be inserted into the engaging portion 45 of the frame body 40 disposed on the upper side. It may be.
- a support portion 33 and a holding portion 34 for holding the positive electrode side bus bar 50 are provided in the horizontal center portion (longitudinal direction center portion) of the horizontal rail 31x.
- the support portion 33 protrudes in the vertical direction and is formed in a block shape, and a part of the positive electrode bus bar 50 extending from one end in the horizontal direction to the center portion is placed on the support portion 33.
- a part (second connection part 52) of the positive electrode side bus bar 50 placed on the support part 33 is located at the upper end part of the parallel block 13.
- the presser part 34 is a protrusion provided on one end side in the lateral direction of the crosspiece 31x with respect to the support part 33 with a gap in which the positive bus bar 50 can be inserted between the support part 33 and the support part 33. 33, restrains the positive side bus bar 50 from moving in the horizontal direction.
- a support portion 43 formed in a block shape and a presser portion 44 that restrains the movement of the negative side bus bar 60 in the horizontal direction together with the support portion 43 are provided in the same manner as the horizontal rail 31x. It is preferred that The support part 43 is arranged side by side with the support part 33 in the vertical direction. It is preferable that a part of the negative electrode side bus bar 60 (second connection part 62) extending from the other side in the lateral direction to the center part side is disposed below the support part 43 and positioned at the lower end part of the parallel block 13. .
- the holding portion 44 is provided on the other side in the lateral direction of the horizontal rail 41x with respect to the support portion 43 with a gap in which the negative bus bar 60 can be inserted between the holding portion 43 and the support portion 43.
- the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are metal conductive members, and are connected to the positive electrode tab laminated portion 14 and the negative electrode tab laminated portion 15 by welding, for example.
- the positive electrode side bus bar 50 includes a first connection part 51 (positive electrode side first connection part), a second connection part 52 (positive electrode side second connection part), and a connection part 53 (positive electrode side connection part). It is preferable that one metal plate be bent.
- the first connection part 51 is a part connected to the positive electrode tab laminate part 14.
- the second connection portion 52 is a portion that extends substantially parallel to the first connection portion 51 and is connected to the negative electrode bus bar 60 of another parallel block 13.
- the positive electrode side bus bar 50 has a constant width over its entire length, and the first connection portion 51 is longer than the second connection portion 52.
- the connection part 53 is a part which connects each connection part, Comprising: A level
- step difference is formed between each connection part.
- the first connecting portion 51 extends from one end of the connecting portion 53 and the second connecting portion 52 extends from the other end of the connecting portion 53 in opposite directions. It is preferable that the connecting portion 53 is formed substantially perpendicular to each connecting portion by bending a metal plate.
- the first connection portion 51 is placed on the upper surface of the positive electrode tab laminate portion 14 and welded, and the second connection portion 52 is placed on the upper surface of the support portion 33 of the frame body 30. That is, the first connection portion 51 is located at the substantially central portion in the vertical direction of the parallel block 13, and the second connection portion 52 is located at the upper end portion of the parallel block 13.
- the connection part 53 forms the level
- the negative electrode side bus bar 60 includes a first connection part 61 (negative electrode side first connection part), a second connection part 62 (negative electrode side second connection part), and a connection part 63 (negative electrode side). It is preferable that a single metal plate be bent and configured.
- the second connection part 62 is connected to the positive bus bar 50 of another parallel block 13.
- the first connection portion 61 is welded to the lower surface of the negative electrode tab laminate portion 15, and the second connection portion 62 is disposed below the support portion 43. That is, the first connection portion 61 is located at the substantially central portion in the vertical direction of the parallel block 13, and the second connection portion 62 is located at the lower end portion of the parallel block 13.
- the connecting part 63 forms a step between the connecting parts.
- the positive electrode side bus bar 50 and the negative electrode side bus bar 60 may have different shapes and dimensions, but preferably have the same shape and the same dimensions.
- the positive electrode side bus bar 50 and the negative electrode side bus bar 60 differ only in the direction in which they are attached to the battery stack 11, and the member used as the positive electrode side bus bar 50 can be used as the negative electrode side bus bar 60.
- the assembled battery 10 can be configured using one type of bus bar, and the number of parts can be reduced.
- the assembled battery 10 includes the battery stack 11 including the plurality of parallel blocks 13 as described above, and is configured by connecting adjacent parallel blocks 13 in series.
- the tabs of the unit cells 20 constituting the parallel block 13 are pulled out in the same direction, and the bus bars are attached on the same surface of the battery stack 11.
- connection work or the like can be performed on one surface, so that productivity is excellent, and the battery pack 10 can be downsized.
- connection part 70AB is formed by overlapping and welding the second connection part 62A of the negative electrode side bus bar 60A and the second connection part 52B of the positive electrode side bus bar 50B.
- a connecting portion 70AB is formed at the boundary between the parallel blocks 13A and 13B.
- connection portion 70AB is provided with a conductive member 71AB sandwiched between the negative electrode side bus bar 60A and the positive electrode side bus bar 50B, and the second connection portion 52B and the second connection portion 62A connect the conductive member 71AB. Is electrically connected.
- Adjacent parallel blocks 13B and 13C are connected in series using a positive bus bar 50C and a negative bus bar 60B. That is, the negative electrode bus bar 60B connected to the negative electrode tab laminate portion 15B of the parallel block 13B and the positive electrode bus bar 50C connected to the positive electrode tab laminate portion (not shown in FIG. 6) of the parallel block 13C are connected to each other.
- the connection portion 70BC is welded to the boundary portion between the parallel blocks 13B and 13C by welding the second connection portion 62B of the negative electrode bus bar 60B and the second connection portion 52C of the positive electrode bus bar 50C via the conductive member 71BC. It is formed.
- connection portions 70AB and 70BC are formed side by side in the vertical direction at the laterally central portion on the side surface 12 of the battery stack 11.
- the tab laminated portions of the parallel blocks 13A, 13B, and 13C are provided so as to avoid the lateral central portion of the side surface 12. Therefore, the connection portions 70AB and 70BC are formed in the central portion, and the conductive portions are formed. Space for arranging the members 71AB and 71BC is secured.
- the connecting part 70AB (second connecting part 52B, second connecting part 62A) is supported from above and below by the support parts of the frame bodies 30A, 40A of the parallel block 13A and the support parts of the frame bodies 30B, 40B of the parallel block 13B. It is preferable to be sandwiched. In the example shown in FIG. 1, these members are stacked in the vertical direction in the order of the positive electrode side bus bar 50, the conductive member 71, the negative electrode side bus bar 60, the frame body 40, and the frame body 30. With such a laminated structure, the connection portion 70 is strongly pressed from above and below, so that, for example, contact failure of the connection portion 70 is unlikely to occur, and a good connection state is maintained for a long time.
- the conductive members 71AB and 71BC are thin plate-like members disposed between the bus bars in the connection portions 70AB and 70BC, respectively. As illustrated in FIG. 1, it is preferable that conductive members 71 are provided in all connection portions 70.
- the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are not directly connected, and a conductive member 71 is interposed therebetween. In the example shown in FIG. 1, the uppermost conductive member 71 is connected only to the positive bus bar 50, and the lowermost conductive member 71 is connected only to the negative bus bar 60. ing.
- the conductive member 71AB has a voltage monitoring terminal portion 72AB protruding from between the positive side bus bar 50B and the negative side bus bar 60A.
- the voltage monitoring terminal portion 72AB extends in the vertical direction from one end in the horizontal direction of the connection portion 70AB.
- the voltage monitoring terminal unit 72AB functions as a terminal for measuring the voltage of the series block composed of the parallel blocks 13A and 13B.
- the voltage monitoring terminal portion 72BC of the conductive member 71BC functions as a terminal for measuring the voltage of the series block composed of the parallel blocks 13B and 13C.
- the voltage monitoring terminal portions 72 are preferably arranged side by side in the vertical direction. By arranging the voltage monitoring terminal portions 72 in a line, it is possible to suppress, for example, a complicated connection structure between each terminal and a voltage measurement unit (not shown).
- the conductive member 71 further functions as a fuse.
- the conductive member 71 is made of, for example, a metal material having a melting point lower than that of the metal material constituting each bus bar (low melting point alloy or the like), and melts and cuts off the current when an excessive current flows.
- a conductive member that functions as a fuse may be used separately from the conductive member for voltage monitoring.
- the conductive member 71 is described as being disposed in all the connection portions 70. However, the conductive member 71 may be disposed only in a part of the connection portions 70, or the conductive member 71 may be Alternatively, each bus bar may be directly welded. Further, the conductive member 71 does not have the voltage monitoring terminal portion 72 and may be used exclusively as a fuse.
- connection portions 70 are formed by welding.
- a plurality of connection portions 70 can be formed using a single bolt 82.
- a bolt 82 that passes through a laminated structure in which each bus bar, the conductive member 71, and each support portion of the frames 30 and 40 are stacked in the vertical direction, and a nut 83 that is attached to the shaft portion of the bolt 82.
- the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are in strong contact with each other through the conductive member 71, and the connection portion 70 is formed.
- Each member constituting the laminated structure is formed with a through hole 81 through which a bolt 82 can be inserted in the vertical direction.
- the bolt 82 and the nut 83 are made of, for example, an insulating material, or have an insulating coating layer on the surface that contacts the bus bar or the like. Or the peripheral part of each bus-bar and the through-hole 81 of the electroconductive member 71 may be comprised from the insulating material, or the insulating coating layer may be formed in the peripheral part of the through-hole 81. . According to the form illustrated in FIG. 7, it is possible to form a plurality of connecting portions 70 using one bolt 82, that is, to connect a plurality of parallel blocks 13 in series at a time.
- the parallel block 13 configured by connecting the two unit cells 20a and 20b in parallel is illustrated, but as illustrated in FIG. 8, the unit cell is configured by connecting the three unit cells 20a, 20b, and 20c in parallel.
- the parallel block 84 may be used.
- the negative electrode tab laminated portion 15 is formed by laminating three negative electrode tabs 23a, 23b, and 23c, and the negative electrode side bus bar 60 is connected to the tab laminated portion.
- the negative electrode tab 23a is straightly extended in the vertical direction
- the negative electrode tabs 23b and 23c are bent toward the negative electrode tab 23a
- the negative electrode tabs 23b and 23c are overlapped with the negative electrode tab 23a to form the negative electrode tab laminate 15.
- FIG. 8 shows the negative electrode tab laminate portion 15
- the positive electrode tab laminate portion 14 can also have the same configuration.
- stacking part is formed along with the horizontal direction of the parallel block 84, for example, the lengths of the connection parts 53 and 63 are mutually different in the positive electrode side bus bar 50 and the negative electrode side bus bar 60 (the length of the connection part 63 is connection). Longer than part 53).
- a frame 85 that does not have a support portion and a presser portion is attached to the unit cell 20b disposed in the middle of the parallel block 84.
- the tab laminated portions are not formed side by side in the horizontal direction, and the positive electrode tab laminated portion 14 is formed above the negative electrode tab laminated portion 15.
- the negative electrode tab 23 c is straightened in the vertical direction, the negative electrode tabs 23 a and 23 b are bent toward the negative electrode tab 23 c, and the negative electrode tabs 23 a and 23 b are overlapped with the negative electrode tab 23 c to form the negative electrode tab stack portion 15. Has been.
- the positive electrode tab laminated portion 14 is formed by extending the positive electrode tab 22a straightly in the vertical direction, bending the positive electrode tabs 22b and 22c to the positive electrode tab 22a side, and overlapping the positive electrode tabs 22b and 22c on the positive electrode tab 23a.
- the tab laminated portions so as to be shifted in the vertical direction in this way, one type of bus bar can be shared as the positive side bus bar 50 and the negative side bus bar 60 (for example, the same bus bar as shown in FIG. 3 can be used).
- the tab laminated portions are formed side by side in a substantially central portion in the vertical direction of the block.
- both the positive electrode tab and the negative electrode tab have a bent shape. Specifically, each tab is folded so that each positive electrode tab and each negative electrode tab are located at a substantially central portion in the vertical direction of the unit cell 20b, and each positive electrode tab and each negative electrode tab are overlapped to form the positive electrode tab stack portion 14, the negative electrode Tab laminated portions 15 are respectively formed.
- each bus bar is arranged on one surface of the battery stack 11, and it is possible to connect each bus bar in a line along the vertical direction. is there. That is, the assembled battery 10 has a simple structure and is easy to assemble. Furthermore, the assembled battery 10 can be configured in a plurality of connection forms by using one type of bus bar, has a small number of parts, and has a high degree of freedom in the connection form of the unit cells 20.
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Abstract
Description
実施形態の説明で参照する図面は、模式的に記載されたものであり、図面に描画された構成要素の寸法比率などは、現物と異なる場合がある。具体的な寸法比率等は、以下の説明を参酌して判断されるべきである。
図1は組電池10の全体を示す斜視図、図2は組電池10を構成する単電池20の斜視図である(併せて、一点鎖線で囲んだ部分の断面を示す)。図3~図5は、電池積層体11の並列ブロック13を示す図である。図6は、正極側バスバー50と負極側バスバー60の接続部70及びその近傍を拡大して示す図である。
図3~図5では、並列ブロック13を構成する2つの単電池20のうち、上側に配置される単電池20を「単電池20a」、下側に配置される単電池20を「単電池20b」とし、各電池の構成要素にa,bをそれぞれ付する。図6では、積み重ねられた並列ブロック13を上から順に「並列ブロック13A,13B,13C」とし、各ブロックの構成要素にA,B,Cをそれぞれ付する。
Claims (6)
- 扁平形状の本体部、前記本体部の一の面の横方向一端側から引き出された正極タブ、及び前記本体部の前記一の面の横方向他端側から引き出された負極タブを有する単電池と、
複数の前記単電池を同じ向きに積み重ねて構成された電池積層体と、
前記正極タブに接続される正極側バスバーと、
前記負極タブに接続される負極側バスバーと、
を備え、
前記電池積層体の隣り合う前記単電池のうち、一方の前記単電池の前記正極タブに接続された前記正極側バスバーと、他方の前記単電池の前記負極タブに接続された前記負極側バスバーとが、前記電池積層体の一の面上で互いに接続されている、組電池。 - 前記電池積層体は、隣り合う少なくとも2つの前記単電池が並列に接続されてなる並列ブロックを複数含み、
前記並列ブロックは、当該ブロックを構成する前記各単電池の前記正極タブ同士を重ね合わせて形成された正極タブ積層部と、当該各単電池の前記負極タブ同士を重ね合わせて形成された負極タブ積層部とを有し、
隣り合う前記並列ブロックのうち、一方の前記並列ブロックの前記正極タブ積層部に接続された前記正極側バスバーと、他方の前記並列ブロックの前記負極タブ積層部に接続された前記負極側バスバーとが互いに接続されている、請求項1に記載の組電池。 - 前記正極側バスバーは、前記正極タブ積層部に接続される正極側第1接続部と、当該第1接続部と略平行に延び、前記負極側バスバーに接続される正極側第2接続部と、当該第1及び第2接続部の間に段差を形成する正極側連結部とを有し、
前記負極側バスバーは、前記負極タブ積層部に接続される負極側第1接続部と、当該第1接続部と略平行に延び、前記正極側バスバーに接続される負極側第2接続部と、当該第1及び第2接続部の間に段差を形成する負極側連結部とを有する、請求項2に記載の組電池。 - 前記正極側バスバー及び前記負極側バスバーは、互いに同一形状、同一寸法を有する、請求項3に記載の組電池。
- 前記正極側バスバーと前記負極側バスバーとの接続部は、前記電池積層体の前記一の面上において、前記単電池の積層方向に並んで複数形成されている、請求項1~4のいずれか1項に記載の組電池。
- 前記正極側バスバーと前記負極側バスバーとの間に挟持された導電性部材を備え、
前記導電性部材は、当該各バスバーの間から突出した電圧監視用端子部を有する、請求項1~5のいずれか1項に記載の組電池。
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US15/504,009 US10056587B2 (en) | 2015-05-08 | 2016-04-11 | Assembled battery |
CN201680002344.3A CN106605317B (zh) | 2015-05-08 | 2016-04-11 | 组电池 |
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US20170279096A1 (en) | 2017-09-28 |
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