CN113644386B - Battery row, battery pack and manufacturing method thereof - Google Patents

Battery row, battery pack and manufacturing method thereof Download PDF

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Publication number
CN113644386B
CN113644386B CN202111201301.7A CN202111201301A CN113644386B CN 113644386 B CN113644386 B CN 113644386B CN 202111201301 A CN202111201301 A CN 202111201301A CN 113644386 B CN113644386 B CN 113644386B
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Prior art keywords
battery
single cylindrical
cylindrical batteries
row
adjacent
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CN202111201301.7A
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CN113644386A (en
Inventor
汪波
刘存良
杨钢
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Jiaxing Modu New Energy Co ltd
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Jiaxing Modu New Energy Co ltd
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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
    • 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
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • 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
    • 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

Abstract

The invention relates to a battery row, a battery pack and a manufacturing method thereof. The battery row comprises a plurality of single cylindrical batteries arranged in a row; the single cylindrical battery comprises a top pole and a side shell pole; all the single cylindrical batteries in the battery row are arranged in the same direction; the bus bar is arranged close to the top poles of the single cylindrical batteries, and the top pole of each single cylindrical battery is electrically connected with the bus bar in a thermal welding mode; at least one cold welding structure is arranged between the side shell pole columns of the adjacent single cylindrical batteries; all the single cylindrical batteries in the battery row are in parallel connection. The invention adopts a composite welding process, a hot welding process is adopted between the top pole of each single cylindrical battery and the busbar, all welding points are manufactured with extremely high efficiency, and the electric connection of the shell poles is efficiently completed between the side shell poles of every two adjacent single cylindrical batteries by a cold welding process.

Description

Battery row, battery pack and manufacturing method thereof
Technical Field
The invention relates to the field of new energy power batteries, in particular to a battery bank, a battery pack and a manufacturing method of the battery bank and the battery pack.
Background
With the continuous development of new energy industry, the market demand of power battery modules is continuously expanding, which puts forward higher requirements on the production efficiency of the power battery modules.
The process of grouping a plurality of single cylindrical batteries is one of the main technical branches of the power battery module. The cylindrical battery pack series-parallel connection electric connection process is generally characterized in that the top pole column is connected in parallel and the shell pole column is connected in parallel, the same electric connection process is adopted, and the mode of metal welding and hot welding of a bus bar and the battery pole column is generally adopted in the industry. Among them, the thermal welding is generally spot welding, laser welding, and ultrasonic welding. Spot welding and ultrasonic welding are carried out point by point after point by point pressing, each electric connection point takes more than 1 second, and the efficiency is very low; the laser welding can be used for row high-speed continuous welding and has higher efficiency. However, the energy concentration point of the laser is small, the flatness requirement for the multi-battery pole column to be located on the same plane is high during welding, otherwise insufficient welding or excessive welding (damage to the battery shell) is easily caused. Because there is certain tolerance in the height of cylindrical battery top cap and casing crimping, cause the high certain tolerance that exists between the casing utmost point post at top utmost point post and shell bottom, after aligning a side utmost point post and by busbar fixed knot structure, the utmost point post of another side is difficult to realign. If the laser welding process is continuously used on the other side, the welding yield is greatly reduced (about 70 percent), the requirement of reliable electric connection of the two sides cannot be met, and the two-side welding mode by using the laser welding process is difficult to popularize.
Because the problem that the efficiency and the yield are difficult to be considered at the same time exists in the thermal welding process, a fast and reliable process implementation method for electric connection of parallel connection of battery anodes, parallel connection of cathodes, serial connection among rows and the like is found in the grouping process of the cylindrical batteries, and the method becomes a research direction for grouping and electric connection of multi-battery arrays.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention discloses a battery pack, comprising:
a plurality of single cylindrical batteries arranged in a row; the single cylindrical battery comprises a top pole and a side shell pole; the top pole is made of a metal conductive material; all the single cylindrical batteries in the battery row are arranged in the same direction;
the bus bar is made of a metal conductive material, is arranged close to the top poles of the plurality of single cylindrical batteries, and the top pole of each single cylindrical battery is electrically connected with the bus bar in a thermal welding mode;
at least one cold welding structure is pressed between the side shell pole columns of the adjacent single cylindrical batteries in a pressing mode, and the cold welding structure can electrically connect the side shell pole columns of the adjacent single cylindrical batteries;
all the single cylindrical batteries in the battery row are of parallel structures.
The invention also discloses a battery pack, comprising:
a plurality of battery rows arranged in an array; at least part of the side shell pole of the battery row is used as an external shell pole of the battery row;
the external shell pole of each battery row is electrically connected with the bus bars of the adjacent battery rows in sequence, and the adjacent battery rows are connected in series;
and the bus bar of the first battery bar is used as an external top pole of the battery pack.
The invention also discloses a manufacturing method of the battery row, which comprises the following steps:
arranging a plurality of single cylindrical batteries in a row in the same direction;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
a cold welding structure is arranged between the adjacent single cylindrical batteries;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive.
The invention also discloses a manufacturing method of the battery pack, which comprises the following steps:
preparing a battery row:
arranging a plurality of single cylindrical batteries in a row;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
a cold welding structure is arranged between the adjacent single cylindrical batteries;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of the adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
electrically connecting a shell pole approach bridge with side shell poles of at least part of single cylindrical batteries;
preparing a battery row;
stacking a plurality of the battery rows;
applying pressure inwardly on both sides of the stacked plurality of battery rows;
applying at least one structural adhesive between adjacent battery rows and curing the structural adhesive;
and sequentially electrically connecting each shell pole approach bridge with the bus bars of the adjacent battery bars.
The invention also discloses a manufacturing method of the battery pack, which comprises the following steps:
preparing a battery row:
arranging a plurality of single cylindrical batteries in a row;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
a cold welding structure is arranged between the adjacent single cylindrical batteries;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of the adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
electrically connecting a shell pole approach bridge with side shell poles of at least part of single cylindrical batteries;
preparing a battery row;
staggering a plurality of the battery rows; the different ends of the auxiliary blocks of the adjacent battery rows are arranged; obtaining a battery array;
insulating plates are respectively arranged on two sides of the battery array;
at least one approach bridge is arranged between the adjacent single cylindrical batteries or between the single cylindrical battery side shell and the auxiliary block;
the approach bridges of all the battery rows extend to the outer side of the insulating plate towards the insulating plate at the same side and are bent towards the same side;
the bus bars of all the battery bars extend to the outer side of the insulating plate and are bent downwards to form bent bus parts;
applying pressure to the space between the first battery row and the last battery row until the auxiliary block is tightly abutted against the side shell of the adjacent battery, wherein the bent part and the extending bus part of the approach bridge are arranged on the outer side of the insulating plate;
applying at least one structural adhesive between the side casings of adjacent single cylindrical batteries between rows in a state of maintaining pressure; at least one structural adhesive is applied between the insulating plate and the adjacent batteries at the end parts of the battery rows; curing the structural adhesive; the insulating plate is at least connected with two auxiliary block mechanical structures of adjacent first and last battery rows;
and electrically connecting the bent parts of the approach bridges and the bent bus parts overlapped at the outer sides of the insulating plates by adopting a hot welding or cold welding mode.
The technical scheme adopted by the invention can achieve the following beneficial effects: the composite welding process is adopted, the hot welding process is adopted between the top pole of each single cylindrical battery and the busbar, all welding spots are manufactured at high efficiency, and the cold welding process is adopted between the side shell poles of every two adjacent single cylindrical batteries, so that the shell poles are electrically connected efficiently. The invention achieves unprecedented preparation efficiency by a unique composite electric connection process, and simultaneously brings higher electric connection stability and better contact resistance consistency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
fig. 1 is a schematic structural view of a battery row disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a battery row disclosed in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a battery row disclosed in embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a battery row disclosed in embodiment 2 of the present invention;
fig. 5 is a schematic structural view of a battery row disclosed in embodiment 2 of the present invention;
fig. 6 is a schematic structural view of a battery pack disclosed in embodiment 3 of the present invention;
fig. 7 is a schematic structural view of a battery pack disclosed in embodiment 3 of the present invention;
fig. 8 is a schematic structural view of a battery pack disclosed in embodiment 3 of the present invention;
fig. 9 is a schematic structural view of a battery pack disclosed in embodiment 3 of the invention;
fig. 10 is a schematic structural view of a battery pack disclosed in embodiment 4 of the invention;
fig. 11 is a schematic structural view of a battery pack disclosed in embodiment 4 of the present invention.
Description of reference numerals:
a single cylindrical battery 1; a window 11; a bus bar 2; a bent confluence part 21; an extended bus portion 211; welding spots 3; a cold-welded structure 4; an auxiliary block 5; an insulating plate 6; a bridge approach 7; a shell pole outgoing bridge 8; and structural adhesive 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
To solve the problems of the prior art, the present embodiment provides a battery bank and a battery pack structure of cylindrical batteries connected in parallel in rows and in series between rows, and a corresponding manufacturing method. By the battery row and battery pack structure, a CTP technical solution of battery packs connected in series between rows is given, and a composite electric connection process is also specifically disclosed in the embodiment.
Example 1
The example 1 provides a composite electrical connection process battery bank, which is used for preparing a single cylindrical battery 1 into CTP modules which are connected in parallel in the bank and connected in series between the banks, is particularly suitable for the preparation process of a power battery unit of a new energy vehicle, and is also suitable for low-speed electric vehicles, electric bicycles and other energy storage products.
According to fig. 1-3, a battery row of the present embodiment, that is, a battery row using a composite electrical connection process, the battery row being one of basic units in a power battery module, includes:
a plurality of single cylindrical batteries 1, the plurality of single cylindrical batteries 1 being arranged in a row; the single cylindrical battery 1 comprises a top pole and a side shell pole; the top pole is made of a metal conductive material; all the single cylindrical batteries 1 in the battery row are arranged in the same direction;
the busbar 2 is made of metal conductive material, is close to the top pole of the single cylindrical batteries 1, and the top pole of each single cylindrical battery 1 is electrically connected with the busbar 2 through a hot welding mode.
At least one cold welding structure 4 is pressed between the side shell pole columns of the adjacent single cylindrical batteries 1, and the cold welding structure 4 can electrically connect the side shell pole columns of the adjacent single cylindrical batteries 1.
All the single cylindrical batteries 1 in the battery row are in a parallel structure.
In the prior art, the same welding method is usually adopted to complete the welding of all welding positions, but in the embodiment 1, the composite welding process is adopted, the hot welding process, preferably the laser welding process, is adopted between the top terminal of each single cylindrical battery 1 and the bus bar 2 to complete the manufacture of all welding points 3 with extremely high efficiency, and the cold welding process, preferably the bridge and cold welding glue mode, is adopted between the side shell terminal of every two adjacent single cylindrical batteries 1 to efficiently complete the electrical connection of the shell terminal. In this embodiment 1, a unique composite electrical connection process is used to achieve unprecedented manufacturing efficiency, and at the same time, higher electrical connection stability and better contact resistance consistency are achieved.
As a preferred embodiment, the thermal welding is a metal welding or a filler metal welding, including one or more of spot welding, laser welding, ultrasonic welding, and argon arc welding, and the welding spot 3 is generated after the thermal welding.
In a preferred embodiment, the cold-welding structure 4 is a generic name of an electrical connection structure that partially or completely adopts a cold-welding process, and includes a cold-welding adhesive disposed between adjacent housing poles, and/or an electrical bridge; preferably, the cold welding glue is a conductive glue which can be solidified at normal temperature; preferably, the bridge is made of an electrically conductive material.
In a preferred embodiment, at least two sides of the bridge are coated with cold-welding glue, and the cold-welding glue is used for increasing the contact area of the electric connection and stabilizing the electric flux of the electric connection point after being solidified. Preferably, the bridge is made of sheet metal after being bent, and the contact surface of the bridge and the shell pole is coated with conductive adhesive.
As a preferred embodiment, the single cylindrical battery 1 in the present embodiment is a power battery with high energy density, and may be selected from 18650 batteries, 21700 batteries, 46800 batteries, and the like, but is not limited thereto, and it should be understood by those skilled in the art that the single cylindrical battery 1 with any specification is suitable for the solution of the present embodiment, and the cylindrical battery with approximate cylinder, such as a cylindrical battery with a cross section of a rounded rectangle, a rounded triangle, or a rounded polygon, is also suitable for the solution of the present embodiment, and can be regarded as the single cylindrical battery 1.
Meanwhile, both bare cells and cells with insulating layers are also suitable. It will be understood by those skilled in the art that when a single cylindrical battery 1 with an insulating layer is employed, the insulating layer has a window 11 that exposes the housing terminal post, as shown in fig. 2.
As a preferred embodiment, at least one structural adhesive 9 is arranged between the side casing poles of the adjacent single cylindrical batteries 1, and the structural adhesive 9 is a low-temperature fast-setting adhesive. Preferably, according to fig. 3, two structural adhesives 9 are disposed between the side casing poles of the adjacent single cylindrical batteries 1, and are respectively located at positions close to the top and the bottom of the side casing poles of the single cylindrical batteries 1.
Preferably, the position of the upper structure glue 9 may be close to the position of the cold-welded structure 4, i.e. the structure glue 9 is disposed at the periphery of the cold-welded structure 4, for fast structural integration of the cold-welded structure 4 and the adjacent side housing pole.
Example 2
This example 2 provides a composite electrical connection process battery row, the difference from embodiment 1 is mainly embodied in the structure of the bus bar 2. According to fig. 4-5, the busbar 2 comprises bent busbars 21 arranged at the ends, the bent busbars 21 being located outside both ends of the battery string. The bent bus bar portion 21 may be provided at both ends, or may be present only at one end of the bus bar 2.
The function of the bent bus bar 21 includes, but is not limited to, taking on the function of electrical connection with other battery rows, which corresponds to placing the external top pole side. The function of the bent bus bar portion 21 also includes restraining the longitudinal gap of the battery row to some extent.
Preferably, according to fig. 5, the bent bus bar 21 has a distance from the side housing poles of the single cylindrical battery 1 at the end; preferably, the bent bus bars 21 at both ends of the bus bar 2 have different distances from the side housing poles of the single cylindrical batteries 1 at the ends.
Example 3
According to fig. 6 to 9, the present example 3 provides a composite electrical connection process battery pack including a plurality of battery rows arranged in an array, each of the battery rows being connected in parallel, and adjacent battery rows being connected in series.
At least part of the side housing poles of the battery row serves as the outer housing poles of the battery row.
As a preferred embodiment, a plurality of housing pole approach bridges 7 are further included, each housing pole approach bridge 7 being electrically connected with a side housing pole of one battery row.
The external shell pole of each battery row is electrically connected with the bus bar 2 of the adjacent battery row in sequence, and the adjacent battery rows are connected in series; the busbar 2 of the first battery row serves as an external top pole of the battery pack.
In a preferred embodiment, at least one structural adhesive 9 is arranged between adjacent side casing pole columns of adjacent battery rows. Preferably, the structural adhesive 9 is arranged between the adjacent side casing pole columns of any two adjacent battery rows and used for keeping the integration of the space between the adjacent single batteries and the structure between the rows.
In a preferred embodiment, adjacent battery rows are arranged in a staggered manner; the battery pack further comprises an auxiliary block 5, wherein the auxiliary block 5 is arranged at least one end of the battery row and used for leveling the end position of the adjacent battery row, limiting the minimum distance between the adjacent battery rows and keeping the adjacent side shell pole columns between the rows not to be conducted.
And insulating plates 6 are further included as a preferable embodiment, and the insulating plates 6 are arranged outside two ends of the battery row. Preferably, the insulating plate 6 has a long bar shape having a length sufficient to cover the lateral length of the battery pack. Preferably, the insulating plate 6 is provided with a series of slots or slots for the passage of the approach bridge 7.
Preferably, the bus bar 2 comprises bent bus parts 21 arranged at the ends, and the bent bus parts 21 are positioned outside two ends of the battery bar;
according to fig. 7, one end of the approach bridge 7 of the plurality of battery rows extends out of the end of the battery row, and is bent to one side after penetrating to the outside of the insulating plate 6, preferably, the free end of all the penetrated approach bridges 7 is bent towards the last row direction (corresponding to upward bending in fig. 7), and the free ends are respectively intersected and electrically connected with the bent confluence part 21 of the adjacent battery row at the outside of the insulating plate 6, so as to realize inter-row series connection.
As a preferred embodiment, a housing pole extraction bridge 8 is also included as an outer housing pole of the entire battery pack.
Example 4
According to fig. 10 to 11, this example 4 provides a composite electrical connection process battery pack including a plurality of battery rows arranged in an array, each of the battery rows being connected in parallel, and adjacent battery rows being connected in series. The difference between the present embodiment 4 and the embodiment 3 is the structure of the bus bars 2 and the way of electrical connection between the bars in series.
The bus bar 2 comprises a bent bus part 21 arranged at the end part, the bent bus part 21 is positioned at the outer side of the auxiliary blocks 5 at the two ends of the battery bar, and the bus bar further comprises an extending bus part 211 extending laterally from the bent bus part 21, and the extending bus part 211 is electrically connected with one end of the housing pole approach bridge 7 of the adjacent battery bar. In this embodiment 4, the bent bus portions 21 bent to the side portions of the battery rows are electrically isolated from the side housing poles by the auxiliary blocks, and the extending bus portions 211 can replace the bent portions of the access bridges 7 of the adjacent battery rows, can continue to extend to the side housing poles of the adjacent battery rows and be electrically connected to each other, and can replace the structures of the access bridges 7 to realize inter-row series connection.
Preferably, the insulating plate 6 may be omitted in this embodiment 4.
Example 5
Embodiment 5 provides a method of manufacturing a battery row, including:
arranging a plurality of single cylindrical batteries 1 in a row in the same direction;
adjusting the top poles of all the single cylindrical batteries 1 to the same plane;
compressing a busbar 2 to the top poles of all the single cylindrical batteries 1;
electrically connecting the top pole of each single cylindrical battery 1 with the bus bar 2 by adopting a thermal welding mode;
a cold welding structure 4 is arranged between the adjacent single cylindrical batteries 1;
applying pressure inwards at both ends of the row of single cylindrical cells 1;
at least one structural adhesive 9 is applied between the side cases of the adjacent unit cylindrical batteries 1 in a state of maintaining pressure, and the structural adhesive 9 is cured.
Preferably, the cold welding structure 4 is a cold welding glue or a bridge with two sides coated with cold welding glue.
Preferably, the step of arranging the plurality of unit cylindrical batteries 1 in a row in the same direction further includes the step of providing at least one auxiliary block 5 at both ends of the plurality of unit cylindrical batteries 1 in a row.
Preferably, the step of electrically connecting the top terminal of each single cylindrical battery 1 with the bus bar 2 by thermal welding, specifically, pressing a bus bar 2 to the top terminals of all the single cylindrical batteries 1, and electrically connecting the top terminal of each single cylindrical battery 1 with the bus bar 2 by thermal welding, preferably laser rapid continuous welding, preferably for 2S. Specifically, the laser point focuses between the bus bar 2 and the top pole, and from the top pole of the first battery along the direction of the bus bar 2, the laser is quickly translated and excited in a pulse mode, so that quick point-by-point welding of the bus bar 2 to the top pole is realized.
Preferably, in the step of arranging the cold welding structure 4 between the adjacent single cylindrical batteries 1, at least one access bridge 7 is arranged between the adjacent single cylindrical batteries 1 or between the lateral shell of the single cylindrical battery 1 and the auxiliary block.
Preferably, the step of arranging the cold welding structure 4 between the adjacent single cylindrical batteries 1 comprises the step of increasing the distance between the side shells of the adjacent single cylindrical batteries 1, wherein the battery rows are arranged in a fan shape; cold welding structures 4 are arranged between the adjacent side shells at the same time; the battery rows are restored to the parallel arrangement form.
Preferably, the step of applying at least one structural adhesive 9 is to dispense the structural adhesive 9 at the upper end and the lower end of the bridge in a simultaneous dispensing manner, expose the bridge with ultraviolet light for 2 seconds, cure the structural adhesive 9, and integrate the battery rows. Preferably, between adjacent battery shells in rows of the upper end face, the structural adhesive 9 is integrally and once dispensed and cured; and between adjacent battery shells between rows of the lower end face, dispensing the structural adhesive 9 and curing the structural adhesive in one step.
Preferably, after the step of curing the structural adhesive 9, the step of removing the applied pressure is further included.
Example 6
Embodiment 6 provides a method of manufacturing a battery pack, including:
preparing a battery row:
arranging a plurality of single cylindrical batteries 1 in a row;
adjusting the top poles of all the single cylindrical batteries 1 to the same plane;
a cold welding structure 4 is arranged between the adjacent single cylindrical batteries 1;
applying pressure inwards at both ends of the row of single cylindrical cells 1;
applying at least one structural adhesive 9 between the side casings of the adjacent single cylindrical batteries 1 in a pressure-maintaining state, and curing the structural adhesive 9;
compressing a busbar 2 to the top poles of all the single cylindrical batteries 1;
electrically connecting the top terminal of each single cylindrical battery 1 with the bus bar 2 by adopting a thermal welding mode;
electrically connecting a shell pole approach bridge 7 with the side shell poles of at least part of the single cylindrical batteries 1;
preparing a battery row;
stacking a plurality of the battery rows;
applying pressure inwardly on both sides of the stacked plurality of battery rows;
applying at least one structural adhesive 9 between adjacent battery rows, and curing the structural adhesive 9;
and sequentially electrically connecting each shell pole approach bridge 7 with the bus bar 2 of the adjacent battery bar.
Specifically, the method for preparing the battery row into the battery pack comprises the following steps:
arranging different ends of the auxiliary blocks 5 of the adjacent rows of the single cylindrical batteries 1, and stacking and arranging the auxiliary blocks into a matrix-shaped battery array;
insulating plates 6 are respectively arranged at two sides of the battery array;
one approach bridge 7 of all the battery rows extends to the outer side of the insulating plate 6 towards the insulating plate 6 on the same side and is bent towards the same side;
one end of the insulating plate 6 on the same side adjacent to the bus bars 2 of all the battery bars extends to the outer side of the insulating plate 6 and is bent downwards;
applying pressure to the space between the first battery row and the last battery row until the auxiliary block 5 is tightly abutted against the side shell of the adjacent battery, and forming a plurality of intersections arranged in a straight line with the same height on the outer side of the insulating plate 6 by the bent part of the approach bridge 7 and the extension confluence part 211;
applying at least one structural adhesive 9 between the side casings of adjacent unit cylindrical batteries 1 between rows in a state of maintaining pressure; at least one structural adhesive 9 is applied between the insulating plate 6 and the adjacent batteries at the end part of each battery row; the structural adhesive 9 is rapidly cured; the insulating plate 6 is at least connected with the two auxiliary blocks 5 of the adjacent first and last battery rows in a mechanical structure;
electrically connecting a plurality of intersections on the same side by adopting a hot welding mode, preferably performing laser rapid continuous welding for 2S; or a plurality of junctions on the same side are simultaneously pressed and electrically connected by adopting an electric connection mode of coating cold welding glue on the junction surfaces of the junctions;
the construction glue 9 is applied and rapidly cured where the junction is adjacent to the insulation board 6.
The composite electrical connection process in the above embodiments 5 and 6 can achieve the following technical effects:
1. the production takt of decomposition processes such as a row arrangement process, a top pole alignment process, an integral bridge insertion process, a two-end integral crimping and simultaneous electric connection process, a single-side disposable spot structure glue 9 process, a single-side integral photocuring process and the like is less than 2 seconds, so that the production takt of the negative electrode cold welding electric connection is less than 2 seconds; the cold welding ensures reliable electrical connection between the cathodes.
2. The parallel fast electric connection process of the top pole laser welding has the advantages that the top pole is aligned to form a plane in the process 1, so that the fast laser welding between the top bus bar 2 and the top pole can be carried out at a high speed and can also be reliably and electrically connected, and the whole laser continuous welding process is less than 2 seconds.
3. The inter-row series electric connection and the structure sealing process have the advantages that the corresponding points are positioned on the same plane and the same straight line, so the laser welding can keep high-speed welding and reliable electric connection; single-side integral glue dispensing is carried out on the upper end and the lower end of the battery pack, integral light curing is carried out to form support-free and reliable structure integration of the battery pack, and the operation time of single working procedures is less than 2 seconds.
4. The inter-row structural stability of the battery pack is enhanced by the aid of the transfer bridge and the inter-row fixing sheets; the inter-row fixing sheet isolates the corresponding point from contacting with the battery side shell, and the safety is improved.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (15)

1. A battery pack, comprising:
a plurality of battery rows arranged in an array;
each of the battery rows includes:
a plurality of single cylindrical batteries arranged in a row; the single cylindrical battery comprises a top pole and a side shell pole; the top pole is made of a metal conductive material; all the single cylindrical batteries in the battery row are arranged in the same direction;
the bus bar is made of a metal conductive material, is arranged close to the top poles of the plurality of single cylindrical batteries, and the top pole of each single cylindrical battery is electrically connected with the bus bar in a thermal welding mode;
at least one cold welding structure is pressed between the side shell pole columns of the adjacent single cylindrical batteries in a pressing mode, and the cold welding structure can electrically connect the side shell pole columns of the adjacent single cylindrical batteries;
all the single cylindrical batteries in the battery row are of parallel structures;
at least part of the side shell pole of the battery row is used as an external shell pole of the battery row;
the external shell pole of each battery row is electrically connected with the bus bars of the adjacent battery rows in sequence, and the adjacent battery rows are connected in series;
the bus bar of the first battery bar is used as an external top pole of the battery pack;
the insulating plates are arranged on the outer sides of two ends of the battery row;
the bus bar comprises bent bus parts arranged at the end parts, and the bent bus parts are positioned on the outer sides of the two ends of the battery bar;
the side shell pole of each battery row is electrically connected with an approach bridge;
one end of the approach bridge of the plurality of battery rows extends outwards towards the end part of the battery row, is bent towards one side after penetrating to the outer side of the insulating plate, and is respectively intersected and electrically connected with the bent confluence part of the adjacent battery rows at the outer side of the insulating plate.
2. The battery of claim 1, wherein at least one structural adhesive is disposed between adjacent side casing posts of adjacent rows of cells.
3. The battery pack of claim 1, wherein adjacent said battery rows are staggered; the battery pack further comprises an auxiliary block, wherein the auxiliary block is arranged at least one end of the battery row and used for leveling the end position of the adjacent battery row and limiting the minimum distance between the adjacent battery rows.
4. The battery according to claim 1, wherein the housing poles of the last row of cells are electrically connected to at least one housing pole extraction bridge, said housing pole extraction bridge acting as a pair of housing poles of the battery.
5. The battery pack according to claim 1, wherein the thermal welding is a metal welding or a filler metal welding connection process.
6. The battery pack of claim 1, wherein the cold-welded structure comprises cold-weld glue, and the cold-weld glue is a conductive glue that can be cured at normal temperature.
7. The battery of claim 6, wherein the cold-welded structure further comprises an electrical bridge made of an electrically conductive material, at least two sides of the electrical bridge being coated with the cold-weld glue.
8. The battery pack according to claim 1, wherein at least one structural adhesive is disposed between side housing terminals of adjacent single cylindrical batteries.
9. The battery of claim 8, wherein the structural adhesive is disposed at a perimeter of the cold-welded structure.
10. A method of manufacturing a battery row, comprising:
arranging a plurality of single cylindrical batteries in a row in the same direction; arranging at least one auxiliary block at both ends of a plurality of single cylindrical batteries in a row;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
a cold welding structure is arranged between the adjacent single cylindrical batteries, wherein the cold welding structure comprises the steps of increasing the space between the side surface shells of the adjacent single cylindrical batteries, and the battery rows are arranged in a fan shape; cold welding structures are arranged between the adjacent side shells at the same time; the battery rows recover the parallel arrangement form;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive.
11. The method of manufacturing according to claim 10, wherein the cold-welded structure is a cold-welded glue or a bridge with both sides coated with cold-welded glue.
12. The manufacturing method according to claim 10, wherein the step of providing the cold-welding structure between the adjacent unit cylindrical batteries further comprises providing at least one bridge between the adjacent unit cylindrical batteries or between the side case and the auxiliary block of the unit cylindrical batteries.
13. The method of claim 10, wherein after the step of curing the structural adhesive, further comprising removing the applied pressure.
14. A method of manufacturing a battery pack, comprising:
preparing a battery row:
arranging a plurality of single cylindrical batteries in a row;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
a cold welding structure is arranged between the adjacent single cylindrical batteries;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of the adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
electrically connecting a shell pole approach bridge with side shell poles of at least part of single cylindrical batteries;
preparing a battery row;
stacking a plurality of the battery rows;
applying pressure inwardly on both sides of the stacked plurality of battery rows;
applying at least one structural adhesive between adjacent battery rows and curing the structural adhesive;
and sequentially electrically connecting each shell pole approach bridge with the bus bars of the adjacent battery bars.
15. A method of manufacturing a battery pack, comprising:
preparing a battery row:
arranging a plurality of single cylindrical batteries in a row;
adjusting the top pole columns of all the single cylindrical batteries to the same plane;
a cold welding structure is arranged between the adjacent single cylindrical batteries;
applying pressure inwards at the two ends of the row of single cylindrical batteries;
applying at least one structural adhesive between the side casings of the adjacent single cylindrical batteries in a pressure-maintaining state, and curing the structural adhesive;
compressing a busbar to the top poles of all the single cylindrical batteries;
electrically connecting the top terminal of each single cylindrical battery with the busbar by means of thermal welding;
electrically connecting a shell pole approach bridge with side shell poles of at least part of single cylindrical batteries;
preparing a battery row;
staggering a plurality of the battery rows;
the battery pack further comprises an auxiliary block, and the auxiliary block is arranged at least one end of the battery row; the different ends of the auxiliary blocks of the adjacent battery rows are arranged; obtaining a battery array;
insulating plates are respectively arranged on two sides of the battery array;
at least one approach bridge is arranged between the adjacent single cylindrical batteries or between the single cylindrical battery side shell and the auxiliary block;
the approach bridges of all the battery rows extend to the outer side of the insulating plate towards the insulating plate at the same side and are bent towards the same side;
the bus bars of all the battery bars extend to the outer side of the insulating plate and are bent downwards to form bent bus parts;
applying pressure to the space between the first battery row and the last battery row until the auxiliary block is tightly abutted against the side shell of the adjacent battery, wherein the bent part of the approach bridge is overlapped with the extending confluence part extending laterally from the bending confluence part on the outer side of the insulating plate;
applying at least one structural adhesive between the side shells of adjacent single cylindrical batteries in rows under the state of keeping pressure; at least one structural adhesive is applied between the insulating plate and the adjacent batteries at the end part of each battery row; curing the structural adhesive; the insulation board is at least connected with two auxiliary block mechanical structures of adjacent first and last battery rows;
and electrically connecting the bent parts of the approach bridges and the bent bus parts overlapped at the outer sides of the insulating plates by adopting a hot welding or cold welding mode.
CN202111201301.7A 2021-10-15 2021-10-15 Battery row, battery pack and manufacturing method thereof Active CN113644386B (en)

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