CN116598718A - Battery cover plate assembly, single battery cell and manufacturing method of single battery cell - Google Patents

Battery cover plate assembly, single battery cell and manufacturing method of single battery cell Download PDF

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Publication number
CN116598718A
CN116598718A CN202310642278.8A CN202310642278A CN116598718A CN 116598718 A CN116598718 A CN 116598718A CN 202310642278 A CN202310642278 A CN 202310642278A CN 116598718 A CN116598718 A CN 116598718A
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CN
China
Prior art keywords
welding
cover plate
core
piece
welding area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310642278.8A
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Chinese (zh)
Inventor
李季
蒋远富
邓昶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chuneng New Energy Co Ltd
Original Assignee
Chuneng New Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chuneng New Energy Co Ltd filed Critical Chuneng New Energy Co Ltd
Priority to CN202310642278.8A priority Critical patent/CN116598718A/en
Publication of CN116598718A publication Critical patent/CN116598718A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • 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

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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)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention provides a battery cover plate assembly, a single battery core and a manufacturing method thereof, wherein the battery cover plate assembly comprises a cover plate and two polar posts with different polarities, and the two polar posts are respectively arranged at two ends of the cover plate in the length direction; the two switching pieces are respectively positioned under the two polar posts, and a channel penetrating through the switching pieces is arranged at the center of the surface of the switching piece along the length direction of the cover plate; the surfaces of the switching pieces on the two sides of the channel are respectively provided with a first welding area, and the channel is used for enabling the lugs on the core package to pass through upwards from the surface of the switching piece, which is far away from the cover plate, and be connected with the first welding areas; and a second welding area is arranged on one side of the first welding area, which is far away from the channel, and is used for being connected with one surface of the pole, which faces the switching piece. According to the invention, after the tab vertically passes through the channel and is welded with the adapter piece, the risk that redundant tab redundancy is reversely inserted into the core bag does not exist.

Description

Battery cover plate assembly, single battery cell and manufacturing method of single battery cell
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cover plate assembly, a single cell and a manufacturing method thereof.
Background
In order to solve the anxiety of people on the endurance mileage, each big battery manufacturer increases the energy density of the power battery by increasing the capacity of the single battery core, but the safety requirement on the single battery core is higher.
The single battery cell is often composed of a single or a plurality of bare battery cells, the bare battery cells are usually manufactured in a winding or lamination mode, and two electrode lugs of an anode and a cathode are arranged on the same side, wherein the main assembly mode is that the electrode lugs are combined with the switching piece through ultrasonic welding firstly, and then the switching piece is welded on the top cover through laser welding.
In order to meet the requirement of the ultrasonic welding operation of the tabs and the switching pieces, in particular to square battery cells connected in parallel with the dual-core package, the dual-core package is generally laid down in a lying mode, the tabs on the dual-core package are respectively welded with the switching pieces, after the welding is finished, the dual-core package is folded close relative to the switching pieces, and due to the fact that the welding area of the tabs on the core package and the switching pieces is limited, after the dual-core package is folded into a shell, part of the tabs on the core package are reversely inserted into the core package in the whole battery cell assembly process, and a very serious safety risk is caused.
For the problem of tab reverse insertion, some solutions have been proposed at present, such as adjusting the welding position and the welding height, but these measures only reduce the tab reverse insertion ratio from the process, and cannot completely solve the problem of tab reverse insertion.
For example, CN116014083a discloses a manufacturing process of a lithium ion battery for preventing tab from being inserted reversely, which is to add a hot melt adhesive coating process and a heating process to prevent tab from being inserted reversely, however, the mode requires additional process steps in the battery production process, the process is complex, and the production cost is high.
In addition, in the prior art, after the tab is welded with the adapter piece, an insulating film is adhered on the tab, and the tab is prevented from being reversely inserted to a large extent in the mode, but the problem of complex manufacturing process still exists.
Therefore, at present, a solution for solving the problem of tab reverse insertion without increasing the process steps is needed.
Disclosure of Invention
In view of this, the invention provides a battery cover plate assembly, a single battery cell and a manufacturing method thereof, which solve the problem that the tab in the prior art is easy to be inserted into the core package without increasing the manufacturing process.
The technical scheme of the invention is realized as follows:
in one aspect, the invention provides a battery cover plate assembly, which comprises a cover plate and two polar posts with different polarities, wherein the two polar posts are respectively arranged at two ends of the cover plate in the length direction;
the solar cell also comprises two adapter plates which are respectively positioned under the two polar posts, a channel penetrating through the transfer sheet is arranged at the center of the surface of the transfer sheet along the length direction of the cover plate, and the surface of the transfer sheet is provided with a first welding area and a second welding area;
the first welding areas are respectively positioned at two sides of the channel, and the channel is used for enabling the lugs on the core bag to pass through upwards from one surface of the switching piece, which is far away from the cover plate, and be connected with the first welding areas;
the second welding area is located on one side, far away from the channel, of the first welding area, and the second welding area is used for being connected with one face, facing the switching piece, of the pole.
On the basis of the technical scheme, preferably, a first mounting hole for mounting a pole is formed in the cover plate, the pole comprises an electrode body and a boss, a first insulating piece is arranged between the electrode body and the first mounting hole, the boss is arranged at the center of the surface of the electrode body along the length direction of the cover plate, and a welding part which is connected with each other is arranged between the bottom surface of the electrode body on two sides of the boss and a second welding area.
As one embodiment, the welding parts are positioned on the bottom surfaces of the electrode bodies at two sides of the boss.
As another embodiment, the weld is located on the surface of the second weld area.
On the basis of the technical scheme, preferably, the battery cover plate assembly further comprises a second insulating part, a second mounting hole is formed in the second insulating part, and the adapter plate is horizontally and fixedly arranged in the second mounting hole.
Further, preferably, the thickness of the adaptor is smaller than that of the second insulating member, and the bottom surface of the adaptor is higher than that of the second insulating member.
Preferably, the width of the first welding area and the thickness of the switching piece are smaller than or equal to the height of the core-wrapped tab.
Preferably, a protruding portion is arranged on one surface, contacted with the cover plate, of the second insulating piece, and a concave portion matched with the protruding portion is arranged on the surface of the cover plate.
On the other hand, the invention also discloses a single battery cell, which comprises a core package, a second shell and the battery cover plate component, wherein the core package is vertically arranged in the shell, the cover plate is arranged at the opening end of the shell and is fixedly connected with the same, the lugs with the same polarity on the core package are mutually close, the lugs with the same polarity pass through the channel of the switching sheet upwards and are respectively connected with the first welding area, and the pole is connected with the second welding area on the switching sheet.
The invention also discloses a manufacturing method of the single cell, which comprises the following steps:
s1, carrying out ultrasonic pre-welding on the pole lugs on the core bags, and vertically and repeatedly arranging at least two core bags, so that pole lug back rests after the pre-welding with the same polarity are arranged on the at least two core bags;
s2, horizontally placing the switching sheet on the top surfaces of at least two core bags, and enabling the tabs with the same polarity to pass through the channels of the switching sheet upwards to be welded with the first welding area;
s3, horizontally placing the cover plate on the top surface of the switching piece, and performing penetration welding through the electrode bodies on the two sides of the boss and a second welding area on the switching piece;
s4, after the assembly of the battery cover plate assembly and the at least two core bags is completed, the at least two core bags are put into the shell, and the welding of the cover plate and the shell is completed.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the battery cover plate assembly disclosed by the invention, the through passage penetrating through the switching piece is arranged at the center of the surface of the switching piece along the length direction of the cover plate, the first welding area and the second welding area are respectively arranged at the two sides of the passage, at least two core packages can be vertically stacked on the bottom surface of the switching piece, at least two tabs with the same polarity of the core packages upwards pass through the through passage, and then are horizontally bent and welded with the first welding area, so that the tabs vertically pass through the through passage and are welded with the switching piece, redundant tab redundancy is avoided and are reversely inserted into the core packages, meanwhile, the terminal post on the cover plate and the second welding area on the switching piece are welded, and the cover plate assembly and the core packages can be easily assembled.
(2) The welding parts which are connected with each other are arranged between the bottom surfaces of the electrode bodies at the two sides of the boss and the second welding areas, so that on one hand, the welding between the pole and the second welding areas of the switching piece can be realized, and on the other hand, the contact between the pole and the pole lug on the first welding areas can be avoided, and the influence on the pole lug in the welding process of the pole and the switching piece is reduced;
(3) By arranging the welding part on the surface of the second welding area, the electrode bodies at two sides of the boss can be penetrated by laser with smaller power and welded with the welding part, so that the influence of larger laser power on the tab of the first welding area is avoided;
(4) By making the bottom surface of the switching piece higher than the bottom surface of the second insulating piece, short circuit caused by contact between the switching piece and the pole piece on the core pack can be avoided;
(5) Through making the width of first welded area and the thickness back of change piece be less than or equal to the height of core package utmost point ear, can make the utmost point ear pass behind passageway and the welding of first welded area, there is unnecessary utmost point ear between change piece and the core package to avoid the utmost point ear to appear falling the risk of inserting the core package.
(6) Through the setting of second insulating part, on the one hand, the convenience is integrated in the second insulating part with the changeover piece in order to realize the position location at core package top to the changeover piece, on the other hand, the second insulating part can make establish electric isolation between core package and the apron.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a battery cover assembly according to the present disclosure;
FIG. 2 is a schematic view of an assembly structure of a cover plate, a first insulating member and a pole according to the present invention;
FIG. 3 is a schematic view of a welded portion of the present disclosure in a battery cover assembly;
FIG. 4 is a schematic view of another construction of the disclosed weld in a battery cover assembly;
FIG. 5 is a schematic view of the structure of the adapter plate and dual core package of the present disclosure;
FIG. 6 is an exploded schematic view of a single cell of the present disclosure;
FIG. 7 is a top view of a single cell of the present disclosure;
FIG. 8 is a plan cross-sectional view taken at A-A of FIG. 7;
reference numerals:
100. a battery cover plate assembly; 1. a cover plate; 2. a pole; 3. a transfer sheet; 31. a channel; 32. a first welding area; 33. a second welding area; 11. a first mounting hole; 21. an electrode body; 22. a boss; 4. a first insulating member; s, a welding part; 5. a second insulating member; 51. a second mounting hole; 52. a boss; 12. a recessed portion; 200. a core pack; 300. a housing; 210. and a tab.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
As shown in fig. 1, referring to fig. 2-5, an embodiment of the invention discloses a battery cover plate assembly 100, which is used in a square single cell, and comprises a cover plate 1 and two polar posts 2 with different polarities, wherein the cover plate 1 of the embodiment is preferably strip-shaped and made of aluminum sheets, the two polar posts 2 are respectively arranged at two ends of the cover plate 1 in the length direction, and the polar posts 2 can be in insulation and fixed connection with the cover plate 1 through riveting or injection molding.
The present embodiment also discloses two adapter pieces 3, wherein the adapter pieces 3 are used for welding with the lugs 210 on the core package 200 on one hand, and are used for welding with the poles 2 on the cover plate 1 on the other hand, so that the poles 2 are electrically connected with the lugs 210 through the adapter pieces 3.
As to the prior art, when the core pack 200 is assembled with the cover plate 1, the tab 210 on the core pack 200 is welded with the adapter plate 3, then the post 2 on the cover plate 1 is welded with the adapter plate 3, for the square battery core parallel to the dual core pack 200, the dual core pack 200 is usually laid down, the tab 210 on the dual core pack 200 is welded with the adapter plate 3 respectively, and in the ultrasonic welding process of the tab 210 and the adapter plate 3, in order to meet the greater fault tolerance, the tab 210 with enough length is always reserved to meet the ultrasonic welding operation requirement of the tab 210 and the adapter plate 3. After the welding is finished, the double-core package 200 is folded and closed relative to the switching piece 3, and as the welding area of the lug 210 on the core package 200 and the switching piece 3 is limited and the extra length exists in the lug 210 after the welding, the double-core package 200 is folded into the shell, and after the whole battery cell assembly process is finished, part of the lug 210 on the core package 200 is reversely inserted into the core package 200, so that the battery cell short circuit occurs, and the serious safety risk is caused.
In order to solve the above-mentioned problem, two switching pieces 3 provided in the present embodiment are respectively located right under two poles 2, and a channel 31 penetrating the switching piece 3 is provided at the center of the surface of the switching piece 3 along the length direction of the cover plate 1. The channels 31 are rectangular through holes, the length of the channels 31 is greater than or equal to the width of the lugs 210 of the core pack 200, the width of the channels 31 is greater than at least twice the total thickness of the lug clusters after pre-welding on the core pack 200, and the arrangement is convenient for passing the lug clusters after pre-welding on at least two core packs 200 through the channels 31. It should be noted that the tab cluster is formed by laminating and fixing a plurality of tabs 210 together.
In this embodiment, the surfaces of the adaptor 3 at two sides of the channel 31 are respectively provided with a first welding area 32, and the channel 31 is used for allowing the tab 210 on the core package 200 to pass through from the surface of the adaptor 3 away from the cover plate 1 and be respectively connected with the first welding areas 32.
In this embodiment, the number of core packs is set to at least two, but of course, four may be set, and when four are set, the total thickness of the four core packs is the same as the total thickness of two.
By adopting the above technical scheme, during actual operation, at least two core packages 200 can be vertically stacked on the bottom surface of the adapter plate 3, and the pre-welded tab clusters on the same side of the at least two core packages 200 are mutually close, the tab clusters with the same polarity of the at least two core packages 200 upwards pass through the channel 31, and then are horizontally bent and attached to the first welding area 32 for welding, so that the tab 210 can vertically pass through the channel 31 and be welded with the adapter plate 3, and redundant tab 210 redundant inverted insertion into the core package 200 does not exist.
Since the first welding area 32 on both sides of the channel 31 of the tab 3 is already welded to the tab 210 of at least two core packages 200, in order to weld the tab 2 to the tab 3, in this embodiment, a second welding area 33 is disposed on the surface of the tab 3 on the side of the first welding area 32 away from the channel 31, where the second welding area 33 is used to connect to the side of the tab 2 facing the tab 3. Therefore, after the lug 210 on the adapter piece 3 and the core pack 200 are welded, the cover plate 1 can be horizontally arranged on the surface of the adapter piece 3, and the cover plate 1 assembly and the core pack 200 can be easily assembled by welding the pole post 2 on the cover plate 1 and the second welding area 33 on the adapter piece 3.
The battery cover plate assembly 100 disclosed by the invention has a simple structure, does not need to additionally add other parts or other manufacturing processes, and can solve the problem of the inverted plug core package 200 of the tab 210 in the single cell assembly process by only improving the structure of the switching sheet 3.
Because the center of the transfer sheet 3 is provided with the channel 31, at least two core packages 200 are vertically stacked on the bottom surface of the transfer sheet 3, so that the tab 210 on the core package 200 passes through the channel 31 and is horizontally bent to be welded with the first welding area 32, after the transfer sheet 3 is welded with the tab 210 on the core package 200, the whole transfer sheet 3 covers the top surfaces of the at least two core packages 200, at this time, after the cover plate 1 is horizontally placed on the transfer sheet 3, the welding of the pole 2 and the second welding area 33 of the transfer sheet 3 can only be realized by penetration welding outside the cover plate 1.
Most of the existing polar posts 2 are riveted by matching the upper plastic, the lower plastic and the rivet with the cover plate 1, and the structural arrangement is that finally, the rivet is welded with the adapter plate 3, however, the thickness dimension of the rivet is larger, and the rivet with larger power is required to be welded with the second welding area 33 on the adapter plate 3 by adopting the penetrating rivet, so that the temperature of the second welding area 33 is too high due to the overlarge laser power, the high temperature of the second welding area 33 is transferred to the first welding area 32, and the melting cracking of the polar lugs 210 is caused.
For this reason, the assembly structure of the cover plate 1 and the pole 2 is improved, specifically, referring to fig. 2-4, in this embodiment, two first mounting holes 11 are formed in the cover plate 1, the pole 2 is mounted in the first mounting holes 11, and since the pole 2 is made of a conductive material, a first insulating member 4 is further disposed between the pole 2 and the first mounting holes 11, and in some embodiments, the cover plate 1, the pole 2 and the first insulating member 4 are implemented by injection molding,
the pole 2 of this embodiment includes electrode body 21 and boss 22, and electrode body 21 is a slice body, and electrode body 21 passes through first insulating part 4 and first mounting hole 11 fixed connection all around, and boss 22 sets up in electrode body 21 surface center department along apron 1 length direction, and boss 22 is located electrode body 21 one side that keeps away from the change piece 3, in this embodiment, boss 22 extends apron 1 top surface, and it is convenient to weld with the consumer.
In this embodiment, after the tab 210 is welded to the first welding area 32 of the adapter piece 3, the bottom surface of the electrode body 21 is welded to the adapter piece 3, and the tab 210 is located between the bottom surface of the electrode body 21 and the adapter piece 3, so that a gap exists between the electrode body 21 and the second welding area 33, which may not be better for performing welding, and a cold joint phenomenon may exist.
For this purpose, the present embodiment is provided with the welding parts S connected to each other between the bottom surface of the electrode body 21 on both sides of the boss 22 and the second welding area 33. On one hand, the bottom surface of the electrode body 21 at two sides of the boss 22 can be welded with the second welding area 33 of the adapter plate 3, and on the other hand, the contact between the pole post 2 and the pole lug 210 on the first welding area 32 can be avoided, so that the influence on the pole lug 210 in the welding process of the pole post 2 and the adapter plate 3 is reduced.
As an embodiment, referring to fig. 3, the welding parts S are provided at the bottom surface of the electrode body 21 at both sides of the boss 22. By this arrangement, by providing the welding portion S, a gap can be provided between the middle portion of the bottom surface of the electrode body 21 and the first welding region 32, thereby avoiding contact between the bottom surface of the electrode body 21 and the tab 210 on the first welding region 32. In this way, the welding with the second welding area 33 on the adapter piece 3 can be realized by laser penetration welding through the electrode body 21 and the welding portion S on both sides of the boss 22 outside the cover plate 1. Thereby realizing the welding of the pole 2 and the adapter piece 3.
Although the welding between the electrode post 2 and the adapter plate 3 can be achieved in the above embodiment, after the welding portion S is provided on the bottom surface of the electrode body 21, the overall thickness is increased, the required laser penetration welding power is large, and the laser energy consumption is increased, on the other hand, too high laser power can cause the temperature of the second welding region 33 of the adapter plate 3 to be too high, and the too high temperature can affect the tab 210 of the first welding region 32.
Therefore, in this embodiment, a second embodiment is further provided, specifically, referring to fig. 4, by disposing the welding portion S on the surface of the second welding area 33, the electrode body 21 on both sides of the boss 22 can be penetrated by the laser with smaller power and welded with the welding portion S, so that the influence of the larger laser power on the tab 210 of the first welding area 32 is avoided.
In order to facilitate welding of the switching piece 3 with the tab 210 and the pole 2 respectively, the battery cover plate assembly 100 of this embodiment is further provided with a second insulating member 5, a second mounting hole 51 is formed in the second insulating member, the switching piece 3 is horizontally and fixedly arranged in the second mounting hole 51, specifically, the position of the second mounting hole 51 corresponds to the position of the first mounting hole 11, the switching piece 3 and the second insulating member 5 are realized through an injection molding process, and through the arrangement of the second insulating member 5, on one hand, the switching piece 3 is conveniently integrated in the second insulating member 5 to realize the position positioning of the switching piece 3 at the top end of the core package 200, and on the other hand, the second insulating member 5 can enable the core package 200 to be electrically isolated from the cover plate 1.
In addition, it is noted that, in this embodiment, the switching piece 3 is integrated in the second insulating member 5, so that the switching piece 3 and the second insulating member 5 may be modularized, and meanwhile, the switching piece 3 and the second insulating member 5 are not stacked, so that the switching piece 3 may be prevented from occupying a height space in the housing 300, thereby improving a utilization rate of the height space of the core pack 200, and further improving an energy density of the single cell.
In this embodiment, the thickness of the adapter piece 3 is smaller than that of the second insulating member 5, so that the adapter piece 3 can be conveniently embedded into the second mounting hole 51 of the second insulating member 5 through an injection molding process, so that the adapter piece 3 does not occupy the internal space of the housing 300.
The bottom surface of change piece 3 is higher than the bottom surface of second insulating part 5, sets up from this, can avoid change piece 3 and core package 200 on the pole piece contact cause the short circuit, simultaneously, has the clearance between change piece 3 and the core package 200, can avoid the high temperature to the influence of the pole piece on the core package 200 when utmost point post 2 and change piece 3 welding.
As some preferred embodiments, the width of the first welding area 32 and the thickness of the adapter plate 3 are smaller than or equal to the height of the tab 210, so that after the tab 210 passes through the channel 31 and is welded to the first welding area 32, no extra tab 210 exists between the adapter plate 3 and the core package 200, and the risk of the tab 210 falling into the core package 200 is avoided. In the actual operation process, after the tab 210 of the core pack 200 is pre-welded by ultrasonic, the height of the tab 210 is cut, so that the tab 210 has no extra length after being welded with the adapter sheet 3, and the tab 210 is prevented from being reversely inserted.
In this embodiment, the protruding portion 52 is disposed on the surface of the second insulating member 5, which contacts the cover plate 1, and the recessed portion 12 matched with the protruding portion 52 is disposed on the surface of the cover plate 1, so that positioning and fixing between the second insulating member 5 and the cover plate 1 can be achieved, and horizontal movement between the cover plate 1 and the second insulating member 5 is avoided.
The invention also discloses a single battery cell, which is shown by referring to fig. 6-8, and comprises a core pack 200, a second shell 300 and a battery cover plate assembly 100, wherein the core pack 200 is vertically arranged in the shell 300, the cover plate 1 is arranged at the opening end of the shell 300 and is fixedly connected with the same, the pole lugs 210 with the same polarity of the core pack 200 are mutually close, the pole lugs 210 with the same polarity pass through the channels 31 of the adapter plate 3 upwards and are respectively connected with the first welding areas 32, and the pole posts 2 are connected with the second welding areas 33 on the adapter plate 3.
According to the single battery cell disclosed by the invention, the tab 210 vertically passes through the channel 31 and is welded with the adapter piece 3, so that redundant tab 210 is not redundant and is reversely inserted into the core package 200, meanwhile, the welding between the pole post 2 on the cover plate 1 and the second welding area 33 on the adapter piece 3 is implemented, the cover plate 1 assembly and the core package 200 can be easily assembled, the battery cover plate assembly 100 disclosed by the invention is simple in structure, and the risk of reversely inserting the tab 210 into the core package 200 in the single battery cell assembling process can be avoided without adding other manufacturing processes.
In the above-disclosed single-body battery cell, the number of the core packages is at least two, and the present invention exemplifies the case that the number of the core packages is two, as shown in fig. 6 and 8, the tab clusters with the same polarity on the two core packages are arranged back to back.
Of course, under the premise of not increasing the thickness of the shell, the number of the core bags can be four, so that the lugs on the outermost core bags of the four core bags are all close to the middle and are welded with the first welding area by passing through the channel, and under the condition that the lugs on the outermost core bags are in a tightening state after being welded with the adapter piece, the problem of reverse insertion of the lugs can be avoided.
The invention also discloses a manufacturing method of the single cell, which comprises the following steps:
s1, carrying out ultrasonic pre-welding on the lugs 210 on the core bags 200, and vertically laminating at least two core bags 200 to enable the lugs 210 with the same polarity on the at least two core bags 200 subjected to pre-welding to be arranged back to back;
s2, horizontally placing the switching sheet 3 on the top surfaces of at least two core bags 200, and welding the tabs 210 with the same polarity with the first welding area 32 by upwards penetrating through the channels 31 of the switching sheet 3;
s3, horizontally placing the cover plate 1 on the switching piece 3, and performing penetration welding through the electrode bodies 21 on two sides of the boss 22 and the second welding area 33 on the switching piece 3;
and S4, after the assembly of the battery cover plate assembly and the at least two core bags 200 is completed, the at least two core bags 200 are put into the shell, and the welding of the cover plate 1 and the shell 300 is completed.
In the above step S2, the switching piece 3 is integrated onto the second insulating member 5 by an injection molding process, and in the assembling process, the second insulating member 5 is placed on the top surfaces of at least two core packages, and in the above step S3, the cover plate 1, the first insulating member 4 and the pole 2 are realized by an injection molding process.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. The battery cover plate component comprises a cover plate (1) and two polar posts (2) with different polarities, wherein the two polar posts (2) are respectively arranged at two ends of the cover plate (1) in the length direction;
the method is characterized in that: the solar cell further comprises two adapter plates (3), wherein the two adapter plates (3) are respectively positioned under the two polar posts (2), a channel (31) penetrating through the adapter plates (3) is arranged at the center of the surface of the adapter plates (3) along the length direction of the cover plate (1), and a first welding area (32) and a second welding area (33) are arranged on the surface of the adapter plates (3);
the first welding areas (32) are respectively positioned at two sides of the channel (31), and the channel (31) is used for allowing the lugs (210) on the core pack (200) to pass through upwards from one surface of the adapter sheet (3) far away from the cover plate (1) and be connected with the first welding areas (32);
the second welding area (33) is positioned on one side of the first welding area (32) away from the channel (31), and the second welding area (33) is used for being connected with one surface of the pole post (2) facing the rotating sheet (3).
2. The battery cover assembly of claim 1, wherein: the novel electrode structure comprises a cover plate (1), wherein a first mounting hole (11) for mounting a pole column (2) is formed in the cover plate (1), the pole column (2) comprises an electrode body (21) and a boss (22), a first insulating piece (4) is arranged between the electrode body (21) and the first mounting hole (11), the boss (22) is arranged at the center of the surface of the electrode body (21) along the length direction of the cover plate (1), and a welding part (S) which is connected with each other is arranged between the bottom surface of the electrode body (21) on two sides of the boss (22) and a second welding area (33) domain.
3. The battery cover assembly of claim 2, wherein: the welding parts (S) are positioned on the bottom surfaces of the electrode bodies (21) on two sides of the boss (22).
4. The battery cover assembly of claim 2, wherein: the welding part (S) is positioned on the surface of the second welding area (33).
5. The battery cover assembly of any one of claims 1-4, wherein: the battery cover plate assembly further comprises a second insulating part (5), a second mounting hole (51) is formed in the second insulating part, and the adapter piece (3) is horizontally and fixedly arranged in the second mounting hole (51).
6. The battery cover assembly of claim 5, wherein: the thickness of the switching piece (3) is smaller than that of the second insulating piece (5), and the bottom surface of the switching piece (3) is higher than that of the second insulating piece (5).
7. The battery cover assembly of claim 1, wherein: the width of the first welding area (32) and the thickness of the transfer sheet (3) are smaller than or equal to the height of the lug (210) of the core pack (200).
8. The battery cover assembly of claim 5, wherein: the surface of the second insulating piece (5) contacted with the cover plate (1) is provided with a protruding part (52), and the surface of the cover plate (1) is provided with a recessed part (12) matched with the protruding part (52).
9. A single cell comprising a core pack (200), a second housing (300) and a battery cover assembly according to any one of claims 1 to 8, characterized in that: the core package (200) is arranged in the shell (300), the cover plate (1) is arranged at the opening end of the shell (300) and is fixedly connected with the same, the lugs (210) with the same polarity on the core package (200) are close to each other, the lugs (210) with the same polarity pass through the channels (31) on the switching piece (3) upwards and are respectively connected with the first welding areas (32), and the pole (2) is connected with the second welding areas (33) on the switching piece (3).
10. A method of making a single cell as claimed in claim 9, comprising the steps of:
s1, carrying out ultrasonic pre-welding on the lugs (210) on the core bags (200), and vertically laminating at least two core bags (200) to enable the lugs (210) on the at least two core bags (200) after the same polarity pre-welding to be close to each other;
s2, horizontally placing the switching sheet (3) on the top surfaces of at least two core bags (200), and upwards penetrating and welding the tabs (210) with the same polarity through the channels (31) on the switching sheet (3) and the first welding areas (32);
s3, horizontally placing the cover plate (1) on the top surface of the switching piece (3), and performing penetration welding through the electrode bodies (21) on two sides of the boss (22) and a second welding area (33) on the switching piece (3);
s4, after the assembly of the battery cover plate assembly and the at least two core bags (200) is completed, the at least two core bags (200) are put into the shell, and the welding of the cover plate (1) and the shell (300) is completed.
CN202310642278.8A 2023-05-29 2023-05-29 Battery cover plate assembly, single battery cell and manufacturing method of single battery cell Pending CN116598718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310642278.8A CN116598718A (en) 2023-05-29 2023-05-29 Battery cover plate assembly, single battery cell and manufacturing method of single battery cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310642278.8A CN116598718A (en) 2023-05-29 2023-05-29 Battery cover plate assembly, single battery cell and manufacturing method of single battery cell

Publications (1)

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CN116598718A true CN116598718A (en) 2023-08-15

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