CN110661029A - Lithium ion battery welding lug structure and welding method thereof - Google Patents
Lithium ion battery welding lug structure and welding method thereof Download PDFInfo
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- CN110661029A CN110661029A CN201910739365.9A CN201910739365A CN110661029A CN 110661029 A CN110661029 A CN 110661029A CN 201910739365 A CN201910739365 A CN 201910739365A CN 110661029 A CN110661029 A CN 110661029A
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- metal
- lithium ion
- welding
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- deposition layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium ion battery welding lug structure and a welding method thereof. Lithium ion battery welding utmost point ear structure includes: the battery comprises a battery core, a metal deposition layer and a metal belt; the cell comprises a current collector uncoated region; the battery cell comprises two positive plates, a negative plate and a diaphragm; the positive plates, the diaphragms, the negative plates, the diaphragms and the positive plates are arranged in a staggered manner; the top of the current collector coating area is sprayed with the metal deposition layer, and the metal belt is welded on the metal deposition layer. The lithium ion battery welding lug structure and the welding method thereof provided by the invention can improve the current carrying capacity of the battery, reduce the contact resistance and increase the effective volume of the battery core.
Description
Technical Field
The invention relates to the field of lithium ion battery metal belt welding, in particular to a lithium ion battery welding lug structure and a welding method thereof.
Background
The lithium ion battery mainly comprises an anode, a cathode, an isolating membrane, electrolyte and a shell, wherein the anode and the cathode are multilayer diaphragm-shaped pole pieces which are wound or stacked together, the pole pieces are isolated by the isolating membrane made of high polymer materials to avoid short circuit, and the electrolyte is filled in the pole pieces and the diaphragm to provide an ion transmission channel. The positive and negative pole pieces, the diaphragm and the electrolyte are sealed in an environment isolated from moisture by the shell. In order to connect the battery to the outside for charging and discharging, the positive and negative electrode plates need to be respectively led out of the housing, and the metal strips of the electrode plates are usually transferred to the metal strip Tab (soft package battery) or the cover plate (square battery) connecting plate by ultrasonic welding to be led out of the housing, as shown in fig. 1-2.
In the existing battery core, a metal belt is led out from the top of a pole piece, an uncoated area of a current collector is uncoated aluminum foil or copper foil, the lower part of the metal belt and the metal belt are overlapped and then ultrasonically welded together, and then the metal belt and the metal belt are packaged in a shell. The ultrasonic welding between the metal band and the uncoated region of the current collector requires an additional space between the top of the separator and the case, which takes up additional height, resulting in a reduced energy density of the battery.
The positive and negative pole pieces are composed of positive and negative electrodes and a current collector, the positive and negative electrodes are composed of powdery active substances, glue and the like, the active substances provide battery capacity, the glue is used for bonding the powdery active substances into electrodes and adhering the electrodes to the current collector, most of the current collector is coated with electrode materials to provide physical support for the electrodes, and meanwhile, a conductive passage of the electrodes is formed through physical contact, and the electrode materials are gathered to an uncoated area of the current collector. After the uncoated areas of the multilayer current collectors are pressed together, the end surface area is sprayed with gold, a metal layer is deposited on the end surface of the sprayed metal particles, the metal layer connects the multilayer current collectors into a whole, all the positive electrodes and all the negative electrodes are further connected into a whole, and the adapter plate is welded on the surface of the metal layer, namely in the direction perpendicular to the pole pieces, by using ultrasonic welding or laser welding, and then connected to the metal belt or the cover plate connecting piece to be led out of the shell.
The existing battery lead-out metal belt has two modes, for a soft package battery, after an uncoated current collector area and the lower end of the metal belt are overlapped, ultrasonic welding is integrated, an ultrasonic welding spot is in the overlapped area, the area extends along the length direction of a pole piece, therefore, the height of the welding spot can increase the extra length of the battery, generally, the length of the whole battery is increased by more than 5mm, and the volume utilization rate is low. Meanwhile, the area of the welding spot is limited by the influence of the height of the battery and the width of the metal belt and cannot be large, the area of the welding spot is the contact area between the multilayer pole piece and the metal belt, so that the contact area is not large, and when heavy current is charged and discharged, the contact resistance is large, so that the heavy current charging and discharging effect of the battery is poor. For prismatic cells, uncoated current collector areas need to be ultrasonically welded to the tabs of the cover plate, and the overall welded structure is similar to that of a soft pack, and therefore the same problem exists.
Because the leading-out direction of the uncoated area of the current collector is limited, when a metal belt or a cover plate connecting sheet is welded, an ultrasonic welding spot can occupy a certain cell height, generally about 5mm, and the length increases extra space in the battery, so that the volume energy density of the battery is reduced; on the other hand, the area of the welding spot is limited by the height of the battery and cannot be large, so that the current carrying capacity of the pole piece is limited, and the internal resistance of the battery is increased.
Disclosure of Invention
The invention aims to provide a lithium ion battery welding lug structure and a welding method thereof, which aim to solve the problems of low battery volume energy density, low current carrying capacity and high battery internal resistance in the conventional metal belt welding mode.
In order to achieve the above object, the present invention provides the following solutions:
a lithium ion battery welding tab structure comprises: the battery comprises a battery core, a metal deposition layer and a metal belt; the cell comprises a current collector uncoated region;
the battery cell comprises two positive plates, a negative plate and a diaphragm; the positive plates, the diaphragms, the negative plates, the diaphragms and the positive plates are arranged in a staggered manner; the top of the current collector coating area is sprayed with the metal deposition layer, and the metal belt is welded on the metal deposition layer.
Optionally, the thickness of the metal deposition layer is 0.1mm-3 mm.
Optionally, the metal deposition layer includes a positive electrode metal deposition layer and a negative electrode metal deposition layer;
the positive metal deposition layer is an aluminum metal layer;
the negative metal deposition layer is a copper metal layer or a nickel metal layer.
Optionally, before spraying the metal deposition layer, cooling the electric core at a cooling temperature of 0 to-50 ℃.
Optionally, the metal band is welded to the metal deposition layer.
A welding method for a lithium ion battery welding lug structure comprises the following steps:
cooling the lithium ion battery at a low temperature to enable the battery cell of the lithium ion battery to be cooled to 0-50 ℃;
spraying gold on the end face of the battery cell coated with the uncoated area of the current collector by using a gold spraying machine to deposit a metal deposition layer with the thickness of 0.1-3 mm;
and welding a metal belt or a connecting sheet on the end surface of the metal deposition layer to form a lithium ion battery welding lug structure.
Optionally, before the step of performing gold spraying on the end surface of the electrical core coated with the uncoated region of the current collector by using a gold spraying machine to deposit a metal deposition layer with a thickness of 0.1-3mm, the method further includes:
and defining the uncoated area of the current collector by using a protective clamp.
Optionally, the protection clamp is a metal square protection sleeve, a battery cell size space is arranged inside the metal square protection sleeve, and the battery cell size space is used for the battery cell.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a welding lug structure of a lithium ion battery and a welding method thereof, wherein a thin metal deposition layer is sprayed out of a non-coating area of a current collector by using a metal spraying process, a metal belt is pasted on the surface of the metal layer and welded in the direction vertical to a pole piece, so that the space occupied by welding the metal belt can be greatly reduced, meanwhile, the welding area can be close to the section size of a battery cell, the welding area is greatly increased, the contact resistance is reduced, and the current carrying capacity of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a front view of a conventional welding tab structure of a lithium ion battery provided by the present invention;
FIG. 2 is a schematic diagram of a conventional welding process of a tab structure for lithium ion battery welding according to the present invention;
fig. 3 is a structural diagram of a welding tab of a lithium ion battery provided by the invention;
FIG. 4 is a schematic diagram of a welding process of a welding tab structure of a lithium ion battery provided by the present invention;
fig. 5 is a flow chart of a welding method of the lithium ion battery tab welding structure provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a lithium ion battery welding lug structure and a welding method thereof, which can improve the current carrying capacity of a battery and reduce contact resistance.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 3 is a structural diagram of a lithium ion battery welding tab structure provided by the present invention, and fig. 4 is a schematic diagram of a welding process of the lithium ion battery welding tab structure provided by the present invention, as shown in fig. 3-4, a lithium ion battery welding tab structure includes: the battery cell, the uncoated area 1 of the current collector, the metal deposition layer 2 and the metal belt 3; the battery cell comprises a pole piece 4 and a diaphragm 5; the pole pieces comprise two positive pole pieces and one negative pole piece; the positive plates, the diaphragms, the negative plates, the diaphragms and the positive plates are arranged in a staggered manner; the top of the current collector coating area is sprayed with the metal deposition layer, and the metal belt is welded on the metal deposition layer; the uncoated area of the current collector is a portion of the current collector that naturally extends and is uncoated as the electrode is coated.
When the lead-out terminal of the film capacitor is metalized, the core is wrapped, gold spraying treatment is carried out on the exposed end of the metalized layer to form a gold spraying layer, and after the gold spraying layer is energized, the two pins are welded on the gold spraying layer of the core to lead out the pins. The capacitor metal spraying material mostly uses zinc or zinc-tin alloy with low melting point.
In a lithium ion battery, zinc or zinc-tin alloy is oxidized at a high potential, and if a metal spraying process similar to a capacitor is adopted, a metal spraying layer is oxidized and corroded in the charging and discharging process, and the connection effect is lost. And if metals such as aluminum, copper, nickel and the like which are stable inside the lithium ion battery are directly adopted, the melting point of the metals is too high, so that the polymer material isolation film material is heated and shrunk, and the positive and negative pole pieces are short-circuited.
The invention provides a metal belt welding mode of a lithium ion battery aiming at the characteristics of materials such as aluminum, copper, nickel and the like. Firstly, fixing an uncoated current collector of a lithium battery exposed out of a diaphragm by using a protection clamp, wherein the main purpose of the protection clamp is to clamp the current collector, so that a metal spraying material is prevented from entering the battery from a gap and scalding the diaphragm; secondly, the battery core is protected, the metal spraying area is ensured to be in the designed area, if the metal spraying area exceeds the designed area, sprayed metal particles can be sprayed to the surface of the diaphragm, and the diaphragm is scalded to cause short circuit in the battery; and cooling the lithium ion battery to 0-50 ℃ at low temperature, and then spraying gold on the end surface of the current collector of the battery core by using a gold spraying machine, wherein the positive electrode of the gold spraying material is aluminum, and the negative electrode of the gold spraying material is copper or nickel. The metal spraying material is rapidly cooled and deposited into a metal spraying layer with the thickness of 0.1-3mm after contacting the end face of the current collector, the electric core is pre-cooled, the pre-cooling process can adopt a conventional refrigeration mode, and a refrigerating unit is used for cooling the battery in a contact cooling mode, so that the temperature can be controlled at a relatively low temperature even though a large amount of heat is absorbed from the metal spraying material, and the membrane cannot be scalded. The protection clamp is a metal square protection sleeve, a battery size space is reserved in the protection clamp, the battery is fixed in the protection sleeve, a metal protection is used for a non-metal spraying area, a hole corresponding to the size of the end face of the current collector is formed in the position of the end face of the uncoated current collector needing metal spraying, and the uncoated current collector exposes the end face from the hole to serve as a metal spraying operation face.
Fig. 5 is a flowchart of a welding method for a lithium ion battery welding tab structure provided by the present invention, and as shown in fig. 5, the welding method for the lithium ion battery welding tab structure includes:
step 501: and cooling the lithium ion battery at a low temperature so that the battery cell of the lithium ion battery is cooled to 0-50 ℃.
Step 502: and spraying gold on the end surface of the battery cell coated with the uncoated area of the current collector by using a gold spraying machine, and depositing a metal deposition layer with the thickness of 0.1-3 mm.
Step 503: and welding a metal belt or a connecting sheet on the end surface of the metal deposition layer to form a lithium ion battery welding lug structure.
After the electric core finishes metal spraying, the current collector end face is a 0.1-3mm back gold spraying layer, the area is the current collector end face, the current collector end face and the current collector are tightly combined together, and the electric core has good conductivity.
The direct welding of the uncoated mass flow body and strap (connection piece) is carried out to the ultrasonic bonding in trade at present, through reducing the solder joint height, increases solder joint width or welding many times, can reduce the solder joint and occupy the size when guaranteeing the solder joint area, but is subject to welding teeth size, and the bonding tool height is still more than 4mm generally, and the battery is inside to occupy highly more than 5mm, to the higher large capacity power battery of electric current requirement, its solder joint height is higher.
A common welding mode of a multilayer metal belt in the application of the lithium ion battery is ultrasonic welding, the position of an ultrasonic welding point is used as a connecting point of the metal belt or a connecting sheet, extra internal space of the battery needs to be occupied, and the welding area is limited. The connecting surface is converted, and the connecting points are converted from the direction parallel to the metal strips to the direction vertical to the metal strips, so that the space occupation of the connecting points is greatly reduced.
By adopting the gold spraying process of the metallized film capacitor, a gold spraying layer with the thickness of 0.1-3mm can be obtained in the vertical direction of the metal strip, the thickness is far smaller than the width of an ultrasonic welding spot, and the occupied space of the metal strip welding can be obviously reduced; however, the application of low-melting-point gold spraying materials such as tin and zinc used for the thin-film capacitor in the lithium ion battery is limited, and aluminum, nickel, copper and the like which can be used in the lithium ion battery have too high melting points, so that the temperature of the lithium ion battery needs to be reduced in advance, and the lithium ion battery can absorb a large amount of heat of the gold spraying materials and cannot be too high, so that a diaphragm is scalded; meanwhile, when the uncoated area of the current collector is subjected to gold spraying, the gold spraying material can permeate into the uncoated area of the current collector to a certain degree to form a three-dimensionally connected integrated gold spraying layer, the contact resistance of the gold spraying layer is smaller, and the weldable area of the metal belt and the connecting sheet is larger, so that lower battery impedance is brought.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a lithium ion battery welding utmost point ear structure which characterized in that includes: the battery comprises a battery core, a metal deposition layer and a metal belt; the cell comprises a current collector uncoated region;
the battery cell comprises two positive plates, a negative plate and a diaphragm; the positive plates, the diaphragms, the negative plates, the diaphragms and the positive plates are arranged in a staggered manner; the top of the current collector coating area is sprayed with the metal deposition layer, and the metal belt is welded on the metal deposition layer.
2. The lithium ion battery welding tab structure of claim 1, wherein the metal deposition layer has a thickness of 0.1mm to 3 mm.
3. The lithium ion battery welding tab structure of claim 2, wherein the metal deposition layer comprises a positive electrode metal deposition layer and a negative electrode metal deposition layer;
the positive metal deposition layer is an aluminum metal layer;
the negative metal deposition layer is a copper metal layer or a nickel metal layer.
4. The lithium ion battery welding lug structure of claim 3, wherein the battery core is cooled at a temperature of 0 to-50 degrees before spraying the metal deposition layer.
5. The lithium ion battery welding tab structure of claim 1, wherein the metal band is welded to the metal deposition layer.
6. A welding method for a lithium ion battery welding lug structure is characterized by comprising the following steps:
cooling the lithium ion battery at a low temperature to enable the battery cell of the lithium ion battery to be cooled to 0-50 ℃;
spraying gold on the end face of the battery cell coated with the uncoated area of the current collector by using a gold spraying machine to deposit a metal deposition layer with the thickness of 0.1-3 mm;
and welding a metal belt or a connecting sheet on the end surface of the metal deposition layer to form a lithium ion battery welding lug structure.
7. The welding method of the welding lug structure of the lithium ion battery according to claim 6, wherein before the step of spraying gold on the end surface of the battery core coated with the uncoated region of the current collector by using a gold spraying machine to deposit a metal deposition layer with a thickness of 0.1-3mm, the method further comprises the following steps:
and defining the uncoated area of the current collector by using a protective clamp.
The device is used for clamping a current collector, preventing a metal spraying material from entering the battery from a gap, protecting the battery core and ensuring that the metal spraying area does not exceed a set position.
8. The welding method for the welding lug structure of the lithium ion battery as claimed in claim 7, wherein the protection clamp is a metal square protection sleeve, a cell size space is arranged inside the metal square protection sleeve, and the cell size space is used for the cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910739365.9A CN110661029A (en) | 2019-08-12 | 2019-08-12 | Lithium ion battery welding lug structure and welding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910739365.9A CN110661029A (en) | 2019-08-12 | 2019-08-12 | Lithium ion battery welding lug structure and welding method thereof |
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| Publication Number | Publication Date |
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| CN110661029A true CN110661029A (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910739365.9A Withdrawn CN110661029A (en) | 2019-08-12 | 2019-08-12 | Lithium ion battery welding lug structure and welding method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097656A (en) * | 2021-05-10 | 2021-07-09 | 厦门海辰新能源科技有限公司 | Pole piece, electric core subassembly and battery |
| CN115603004A (en) * | 2022-11-08 | 2023-01-13 | 厦门海辰储能科技股份有限公司（Cn） | Connecting piece design method, connecting piece, energy storage equipment and electric equipment |
-
2019
- 2019-08-12 CN CN201910739365.9A patent/CN110661029A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097656A (en) * | 2021-05-10 | 2021-07-09 | 厦门海辰新能源科技有限公司 | Pole piece, electric core subassembly and battery |
| CN113097656B (en) * | 2021-05-10 | 2023-04-25 | 厦门海辰储能科技股份有限公司 | Pole piece, battery core assembly and battery |
| CN115603004A (en) * | 2022-11-08 | 2023-01-13 | 厦门海辰储能科技股份有限公司（Cn） | Connecting piece design method, connecting piece, energy storage equipment and electric equipment |
| CN115603004B (en) * | 2022-11-08 | 2024-02-20 | 厦门海辰储能科技股份有限公司 | Design method of connecting sheet, energy storage equipment and electric equipment |
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