CN110622340B - Battery module and method for manufacturing battery module - Google Patents

Battery module and method for manufacturing battery module Download PDF

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Publication number
CN110622340B
CN110622340B CN201880030292.XA CN201880030292A CN110622340B CN 110622340 B CN110622340 B CN 110622340B CN 201880030292 A CN201880030292 A CN 201880030292A CN 110622340 B CN110622340 B CN 110622340B
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China
Prior art keywords
voltage monitoring
case
bus bars
battery
battery module
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CN201880030292.XA
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Chinese (zh)
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CN110622340A (en
Inventor
中山圣英
武田泰人
竹井英俊
铃木雄大
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/502Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/569Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/10Batteries in stationary systems, e.g. emergency power source in plant
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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

Abstract

The present invention provides a battery pack, which is provided with: the battery pack includes a case 20, a plurality of battery cells 30 stacked in the case 20, a bus bar 40 welded to an electrode tab 31 of the battery cells 30, and a voltage monitoring line 50 connected to the bus bar 40 and a measurement unit for measuring the voltage of the battery cells 30, wherein the bus bar 40 is held in the case 20 near the electrode tab 31, and the bus bar 40 and the voltage monitoring line 50 are connected to a terminal portion 51 of the voltage monitoring line 50, but are not fixed to the case 20.

Description

Battery pack and method for manufacturing battery pack
Technical Field
The present invention relates to a battery module and a method of manufacturing the battery module.
The present application claims priority based on patent application No. 2017-124903 filed in japan on day 27 of 6.2017, the contents of which are incorporated herein by reference.
Background
In recent years, a general house has been installed with a battery unit to store electric energy generated by solar panels or the like so as to be usable at night. The battery unit includes a case, and a plurality of battery modules accommodated in the case in a stacked manner.
The battery pack includes a case, a plurality of power storage bodies housed inside the case, a bus bar welded to an electrode tab of the power storage body, and a voltage monitoring line connected to the bus bar and a measurement portion that measures a voltage of the power storage body. In the battery module, the bus bar and the voltage monitoring wire are screwed and fixed to the case at the terminal portion of the voltage monitoring wire (for example, see patent document 1).
Documents of the prior art
Patent literature
Patent document 1: japanese patent application laid-open No. 2008-520076
Disclosure of Invention
Technical problems to be solved by the invention
However, in the battery module described in patent document 1, the bus bars may be disconnected when vibration is applied.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery module capable of preventing bus bars from being disconnected even if vibration is applied.
Means for solving the problems
A battery pack is provided with: the battery pack includes a case, a plurality of battery cells housed in the case in a stacked manner, a plurality of bus bars welded to electrode tabs of the battery cells, respectively, a measurement unit that measures voltages of the battery cells, respectively, and a plurality of voltage monitoring lines connected to the bus bars, wherein the bus bars are fixed to the case near the electrode tabs, and at least one set of the bus bars and the voltage monitoring lines is connected to a terminal portion of the voltage monitoring lines, but is not fixed to the case.
The battery module according to [1], wherein the plurality of bus bars and the plurality of voltage monitoring wires are each independently connected by at least one connection mechanism selected from rivets, solders, welds, screws, and rivets.
The battery module according to [1], wherein the plurality of bus bars and the plurality of voltage monitoring lines are respectively formed integrally.
A method for manufacturing a battery module, the battery module comprising: the method includes connecting at least one set of the plurality of bus bars and the plurality of voltage monitoring lines to terminal portions of the voltage monitoring lines, but not to the case.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a battery module capable of preventing the bus bar from being disconnected even when vibration is applied.
Drawings
Fig. 1A is a front view showing a schematic structure of a first embodiment of a battery module of the present invention.
Fig. 1B is a view showing a schematic structure of a first embodiment of a battery module of the present invention, which is an enlarged view of a region α in fig. 1A, and is a sectional view taken along a depth direction of fig. 1A.
Fig. 2 is a sectional view showing a schematic structure of a battery cell of the battery module of the present invention.
Fig. 3 is a plan view showing a schematic case of a connection structure between a bus bar and a voltage monitoring line in a second embodiment of a battery module of the present invention.
Fig. 4 is a plan view showing a schematic case of a connection structure between bus bars and voltage monitoring lines in a third embodiment of a battery module according to the present invention.
Fig. 5 is a plan view showing a schematic case of a connection structure between bus bars and voltage monitoring lines in a fourth embodiment of a battery module according to the present invention.
Fig. 6 is a plan view showing a schematic case of a connection structure between bus bars and voltage monitoring lines in a fifth embodiment of a battery pack of the present invention.
Fig. 7 is a plan view showing a schematic case of a connection structure between bus bars and voltage monitoring lines in a sixth embodiment of a battery module according to the present invention.
Detailed Description
An embodiment of the battery module of the present invention will be explained.
It should be noted that this embodiment is specifically described for better understanding of the gist of the present invention, and the present invention is not limited to the embodiment unless otherwise specified.
[ Battery Assembly ]
(1) First embodiment
Fig. 1A is a front view showing a schematic configuration of the battery module of the present embodiment. Fig. 1B is a diagram showing a schematic configuration of the first embodiment of the battery module of the present invention, is an enlarged view of a region α in fig. 1A, and is a sectional view taken along the depth direction of fig. 1A.
The battery pack 10 of the present embodiment includes a case 20, a plurality of battery cells 30 stacked in the case 20, a plurality of bus bars 40 welded to electrode tabs 31 of the battery cells 30, a measuring portion (not shown) for measuring the voltage of each of the battery cells 30, and a plurality of voltage monitoring lines 50 of the bus bars 40.
As shown in fig. 1B, on the front surface (end surface perpendicular to the longitudinal direction of the battery assembly 10) 10a side of the battery assembly 10, the bus bar 40 is held by the case 20 in the vicinity of the electrode tab 31 of the battery cell 30. That is, the bus bar 40 is held by the housing 20 by being inserted into an insertion portion (gap) of the bus bar formed on the housing 20.
The electrode tabs 31 of the battery cells 30 and the bus bars 40 are connected by welding at the welding parts 60.
The bus bar 40 and the voltage monitoring line 50 are connected to a terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 1B, the bus bar 40 and the voltage monitoring wire 50 are connected to each other at the terminal portion 51 by a rivet 70 as a connection mechanism. The rivet 70 is housed in a recess 21 formed in the case 20 so as to be recessed in the depth direction of the battery module 10 on the front surface 10a side of the battery module 10. In this case, a gap is preferably present between the rivet 70 and the recess 21.
In the present embodiment, a plurality of sets of the bus bars 40 and the voltage monitoring lines 50 are provided corresponding to the plurality of battery cells 30, and at least one of the sets may be connected but not fixed to the case 20. From the viewpoint of more reliably preventing the bus bars from being disconnected due to vibration or the like, and from the viewpoint of making the battery assembly 10 easier to manufacture, it is preferable that 1/3 or more of the plurality of sets, more preferably 1/2 or more of the plurality of sets, further preferably 2/3 or more, and most preferably all of them are connected, but not fixed to the case 20. In particular, in the case where the battery cells 30 are connected in series, it is preferable that all of the plurality of groups are connected to the case 20 but not fixed to the case 20.
Here, "fixed" means a state of being joined to the housing 20 even by mechanical joining, welding, adhesion, or the like, and not being detached from the housing 20 even if a certain force is applied. The "fixed" state does not include the bus bar 40 and the voltage monitoring wire 50 simply making contact with the housing 20 in the movable state.
The structure of the battery cell 30 is not particularly limited. For example, as shown in fig. 2, the battery cells 30 are formed in a sheet shape (plate shape). The battery unit 30 includes a power storage body 32, a package 33 housing the power storage body 32, and an electrolyte 34 filled in the package 33.
The storage cell 32 is configured by alternately stacking positive electrode portions 35 and negative electrode portions 36 in the thickness direction of the battery cell 30. The positive electrode portion 35 includes a positive electrode sheet (not shown) and a positive electrode active material layer (not shown) provided on a main surface thereof. Negative electrode portion 36 includes a negative electrode sheet (not shown) and a negative electrode active material layer (not shown) provided on a principal surface thereof.
A separator 37 is disposed between the positive electrode portion 35 and the negative electrode portion 36. That is, the positive electrode portion 35, the separator 37, the negative electrode portion 36, the separator 37, and the positive electrode portion 35 \8230, are stacked in this order to form the power storage body 32.
As the positive electrode sheet, aluminum foil or the like can be used. As the positive electrode active material layer, a lithium metalate compound represented by the general formula "LiMxOy (where M is a metal; and x and y are composition ratios of the metal M to oxygen O)" or the like is used. AsThe lithium metal oxide compound includes: lithium cobaltate (LiCoO) 2 ) Lithium nickelate (LiNiO) 2 ) And the like.
As the negative electrode sheet, copper foil or the like can be used. As the negative electrode active material layer, graphite (graphite), silicon oxide, or the like can be used.
The material of the separator 37 is not particularly limited, and examples thereof include: microporous polymer films, nonwoven fabrics, glass fibers, and the like.
The structure of the outer package 33 is not particularly limited. The exterior body 33 has, for example, a first laminated film 38 and a second laminated film 39 formed by laminating a modified PP (polypropylene) layer, an aluminum layer, a nylon layer, and a PET (polyethylene terephthalate) layer from the inner layer side.
The package 33 is formed into a bag shape by welding the edge of the modified PP layer of the first laminated film 38 and the edge of the modified PP layer of the second laminated film 39.
The electrolyte 34 is not particularly limited, and for example, it can be suitably used: electrolytes, electrolytic solutions, and the like used in lithium ion secondary batteries are known. As the electrolytic solution, a mixed solution in which an electrolyte salt is dissolved in an organic solvent can be cited.
The battery unit 30 includes a pair of tabs (terminals), not shown. The battery cell 30 may be charged or discharged through a pair of tabs.
The mass of the one or more battery cells 30 is several tens kg to 100kg, etc., and is relatively heavy.
In the battery pack 10 of the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the case 20. Therefore, even if vibration is applied to the terminal portion 51 of the voltage monitoring line 50, the bus bar 40 can be prevented from being disconnected.
(2) Second embodiment
Fig. 3 is a schematic plan view showing a connection structure between the bus bar and the voltage monitoring line in the battery module of the present embodiment. In fig. 3, the same components as those shown in fig. 1 are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 3, the bus bar 40 and the voltage monitoring line 50 are connected by the solder 80 of the connection mechanism at the terminal portion 51 of the voltage monitoring line 50. Further, the connection portion containing the solder 80 is on the front surface 10a side of the battery assembly 10, and is not fixed to the case 20.
According to the battery module of the present embodiment, the same effects as those of the battery module 10 of the first embodiment can be obtained.
(3) Third embodiment
Fig. 4 is a schematic plan view showing a connection structure between the bus bar and the voltage monitoring line in the battery module of the present embodiment. In fig. 4, the same reference numerals are used to designate the same components as those shown in fig. 1, and the description thereof will be omitted.
In the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 4, the bus bar 40 and the voltage monitoring line 50 are connected to each other at the terminal portion 51 by the welding portion 90 of the connection mechanism. Further, the connection portion including the welding portion 90 is on the front surface 10a side of the battery assembly 10, and is not fixed to the case 20.
According to the battery pack of this embodiment, the same effects as those of the battery pack 10 of the first embodiment can be obtained.
(4) Fourth embodiment
Fig. 5 is a schematic plan view showing a connection structure between the bus bar and the voltage monitoring line in the battery module of the present embodiment. In fig. 5, when the same structure as that shown in fig. 1 is provided, the same reference numerals are used and the description thereof is omitted.
In the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to each other at the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 5, the bus bar 40 and the voltage monitoring line 50 are connected at the terminal portion 51 by a screw 100 as a connection mechanism. The screw 100 is housed in a recess formed in the case 20 so as to be recessed in the depth direction of the battery module 10 on the front face 10a side of the battery module 10. In this case, a gap is preferably present between the screw 100 and the recess.
According to the battery pack of this embodiment, the same effects as those of the battery pack 10 of the first embodiment can be obtained.
(5) Fifth embodiment
Fig. 6 is a schematic plan view showing a connection structure between bus bars and voltage monitoring lines of the battery module of the present invention. In fig. 6, when the same structure as that shown in fig. 1 is provided, the same reference numerals are used and the description thereof is omitted.
In the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 6, the bus bar 40 and the voltage monitoring line 50 are connected to each other at the terminal portion 51 by a caulking portion 110 as a connection mechanism. The caulking portion 110 is provided at an end portion of the bus bar 40 opposite to the portion fixed to the case 20. The terminal 51 of the voltage monitoring line 50 is inserted into the caulking portion 110 and caulked to the caulking portion 110, whereby the bus bar 40 and the voltage monitoring line 50 are connected. The connection portion including the caulking portion 110 is on the front surface 10a side of the battery module 10, but is not fixed to the case 20.
According to the battery module of this embodiment, the same effects as those of the battery module 10 of the first embodiment can be obtained.
(6) Sixth embodiment
Fig. 7 is a schematic plan view showing a connection structure between bus bars and voltage monitoring lines of the battery module of the present invention. In fig. 7, the same reference numerals are given to the components having the same configurations as those shown in fig. 1, and the description thereof will be omitted.
In the present embodiment, the bus bar 40 and the voltage monitoring line 50 are connected to the terminal portion 51 of the voltage monitoring line 50, but are not fixed to the housing 20. More specifically, as shown in fig. 7, the bus bar 40 and the voltage monitoring line 50 are connected by being integrated. The bus bar 40 and the voltage monitoring line 50 are integrally formed by pressing a metal plate or the like. The boundary 45 between the bus bar 40 and the voltage monitoring line 50 is on the front surface 10a side of the battery module 10, but is not fixed to the case 20.
According to the battery pack of this embodiment, the same effects as those of the battery pack 10 of the first embodiment can be obtained.
[ method for producing Battery Module ]
The battery module is manufactured by a known method except that at least one set of the plurality of bus bars and the plurality of voltage monitoring lines is connected to a terminal portion of the voltage monitoring line, but is not fixed to the case.
According to this method, it is not necessary to fix the bus bar and the voltage monitoring wire to the case, and therefore, not only the battery module can be easily manufactured, but also the battery module that can prevent the bus bar from being disconnected even if vibration is applied can be manufactured as described above, as compared with the conventional method.
[ Note ] of
10 method 8230and battery assembly
20 \ 8230and casing
21 \ 8230and concave part
30-8230and battery unit
31 \ 8230and electric connecting piece
32 \8230andelectric storage body
33 \ 8230and external body
34 \8230andelectrolyte
35' \ 8230and positive electrode part
36' \ 8230and negative electrode part
37 \ 8230and partition board
38 8230A first laminated film
39 8230and a second laminated film
40 8230a bus bar
50' 8230and voltage monitoring line
51 \ 8230and terminal part
60 \ 8230and welding part
70 \ 8230and rivet
80 8230a soldering tin
90-8230and welded part
100 \ 8230and screw
110 \ 8230and riveted part

Claims (3)

1. A battery pack is provided with:
a case, a plurality of battery cells housed in the case in a stacked manner, a plurality of bus bars welded to electrode tabs of the battery cells, a measurement unit that measures voltages of the battery cells, and a plurality of voltage monitoring lines connected to the bus bars,
each bus bar is fixed to the case in the vicinity of the electrode tabs,
at least one set of the plurality of bus bars and the plurality of voltage monitoring lines is connected at a terminal portion of the voltage monitoring line, but is not fixed to the housing,
the bus bar and the voltage monitoring line are connected at a terminal portion of the voltage monitoring line by a connecting mechanism which is housed in a recess formed in the case so as to be recessed in a depth direction of the battery pack on a front surface side of the battery pack, and a gap is provided between the connecting mechanism and the recess,
the connecting mechanism is at least one selected from rivets, soldering tin, welding, screws and riveting.
2. The battery module according to claim 1, wherein the plurality of bus bars and the plurality of voltage monitoring wires are each independently connected by at least one connection mechanism selected from rivets, solder, welding, screws, and rivets.
3. A method for manufacturing a battery pack, the battery pack comprising:
a case, a plurality of battery cells housed in the case in a stacked manner, a plurality of bus bars welded to electrode tabs of the plurality of battery cells, a plurality of voltage monitoring lines connected to a measuring portion for measuring a voltage of each of the plurality of battery cells and the plurality of bus bars,
each of the bus bars is fixed to the case in the vicinity of the electrode tabs, the method including,
connecting at least one set of the plurality of bus bars and the plurality of voltage monitoring lines to a terminal portion of the voltage monitoring line, but not fixing the bus bars and the plurality of voltage monitoring lines to the housing,
the bus bar and the voltage monitoring line are connected at a terminal portion of the voltage monitoring line by a connecting mechanism which is housed in a recess formed in the case so as to be recessed in a depth direction of the battery pack on a front surface side of the battery pack, and a gap is provided between the connecting mechanism and the recess,
the connecting mechanism is at least one selected from rivets, soldering tin, welding, screws and riveting.
CN201880030292.XA 2017-06-27 2018-06-27 Battery module and method for manufacturing battery module Active CN110622340B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017124903 2017-06-27
JP2017-124903 2017-06-27
PCT/JP2018/024411 WO2019004296A1 (en) 2017-06-27 2018-06-27 Battery module and method for producing battery module

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CN110622340B true CN110622340B (en) 2022-10-14

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KR20210095402A (en) * 2020-01-23 2021-08-02 주식회사 엘지에너지솔루션 Battery Pack Comprising Ring Terminal Coupled in any Direction
EP4258457A4 (en) * 2021-10-29 2024-03-20 Contemporary Amperex Technology Co Ltd Battery, electrical device, and method and device for manufacturing battery

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JP7150714B2 (en) 2022-10-11
WO2019004296A1 (en) 2019-01-03

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