All-tab battery and manufacturing method thereof

Abstract

The invention provides a full-tab battery manufacturing method which is applied to a full-tab battery with a rectangular cross section, tabs protrude out of two sides of the short edge of the rectangle, poles and mounting plates thereof are positioned at one end of the long edge of the rectangle, the poles and the tabs are two in number and are in one-to-one correspondence, and each pair of poles and tabs is electrically connected through a connecting piece. And the section of the connecting sheet is L-shaped. The invention also provides the full-tab battery which is manufactured by the manufacturing method of the full-tab battery. According to the invention, a full-tab process is adopted in the manufacturing process of the battery pole piece, the positive and negative tabs respectively extend out from different sides after lamination or winding to form the core package after ultrasonic welding, and the open area of the tabs is increased on the premise of not influencing the safety.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and particularly to a battery with a full-tab structure and a manufacturing process thereof. Background Art

[0002] In recent years, as lithium batteries, the most representative energy storage devices in the field of new energy, have been increasingly widely used in fields such as mobile electronic devices, electric vehicles, and energy storage, various electric vehicle enterprises on the market have successively launched the slogan of fast charging, such as charging 80% of the capacity in 20 minutes and 70% of the capacity in 10 minutes.

[0003] Fast charging of the battery requires charging with a large current. The internal overcurrent structure of the battery includes: current collectors, tabs, connecting pieces, and terminal posts. However, in the traditional assembly method, the overcurrent areas of the tabs and the connecting pieces are limited, which restricts the overcurrent capacity of the battery. If fast charging is carried out with a large current, a large amount of heat will be generated at the overcurrent weak points, affecting the battery thermal management and even causing safety risks to the battery.

[0004] Therefore, how to increase the overcurrent area of the tabs without increasing the battery volume is an urgent problem to be solved in the industry. Summary of the Invention

[0005] A main object of the present invention is to overcome at least one defect of the above-mentioned prior art, and to provide a full-tab battery and a manufacturing method thereof that can increase the overcurrent area of the tabs without increasing the battery volume.

[0006] To achieve the above object of the invention, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, there is provided a manufacturing method for a full-tab battery, which is applied to a battery with a rectangular cross-section of the full tab. The tabs protrude from both sides of the short side of the rectangle, and the terminal post and its mounting plate are located at one end of the long side of the rectangle. Both the terminal post and the tab are two and correspond to each other one by one. Each pair of terminal post and tab is electrically connected through a connecting piece, and the cross-section of the connecting piece is L-shaped.

[0008] According to an embodiment of the present invention, the connecting piece includes a first electrical connection portion and a second electrical connection portion. The first electrical connection portion is electrically connected to the terminal post, and the second electrical connection portion is electrically connected to the tab. The first electrical connection portion and the second electrical connection portion are arc-connected.

[0009] According to an embodiment of the present invention, the middle of the second electrical connection portion is grooved, and the tab passes through the middle groove and is welded to the second electrical connection portion in a fitting manner.

[0010] According to an embodiment of the present invention, the connection surface of the tab is welded to the plane of the second electrical connection part, and is trapezoidally distributed on both sides along the entire length of the protruding part of the tab.

[0011] According to an embodiment of the present invention, the length of the middle slot is equal to or greater than the length of the protruding tab.

[0012] According to an embodiment of the present invention, each battery includes two core packages, and the two core packages are placed side by side.

[0013] According to an embodiment of the present invention, the tabs of the two core packages jointly pass through the middle slot of the connection piece and are welded and connected.

[0014] According to an embodiment of the present invention, the width of the positive tab of the full-tab battery is 80, and the width of the negative tab is 80.

[0015] According to an embodiment of the present invention, the total current-carrying area of the positive tab foil of the full-tab battery is 124.8, and the total current-carrying area of the negative tab foil is 126.72.

[0016] According to another aspect of the present invention, there is provided a full-tab battery manufactured by the manufacturing method of the above-mentioned full-tab battery.

[0017] As can be seen from the above technical solutions, the advantages and positive effects of the full-tab battery and its manufacturing method of the present invention are as follows:

[0018] In the process of manufacturing the battery electrode sheet, the present invention adopts the full-tab process. After lamination or winding, the positive and negative tabs extend from different sides respectively and are ultrasonically welded to form a core package, increasing the current-carrying area of the tab without affecting safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an assembled three-dimensional structural schematic diagram of an embodiment of the full-tab battery of the present invention.

[0020] Figure 2 is a three-dimensional structural schematic diagram of the connection piece in an embodiment of the full-tab battery of the present invention.

[0021] Figure 3 is a three-dimensional structural schematic diagram of the core package in an embodiment of the full-tab battery of the present invention.

[0022] Figure 4 is a connection structural schematic diagram of the tab and the connection piece in an embodiment of the full-tab battery of the present invention.

[0023] Figure 5 is a partial assembled cross-sectional schematic diagram of an embodiment of the full-tab battery of the present invention.

[0024] Figure 6It is a schematic diagram for comparing the technical effects of the all-pole-ear battery of the present invention with the prior art.

[0025] Explanation of figure numbers:

[0026] 1 - Aluminum shell; 2 - Battery core package; 21 - First pole ear; 22 - Second pole ear; 3 - Mounting plate; 31 - First pole column; 32 - Second pole column; 311 - First pin; 321 - Second pin; 4 - Elastic insulating part; 5 - Transparent insulating film; 6 - Through hole; 7 - Middle slot; 8 - First pin holding bracket; 9 - Second pin holding bracket. Detailed implementation manners

[0027] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted.

[0028] In the following description of different examples of the present invention, reference is made to the accompanying drawings which form a part of the present invention and in which are shown, by way of example, various exemplary structures, systems and steps by which aspects of the present invention can be implemented. It should be understood that other specific solutions of components, structures, exemplary devices, systems and steps can be used and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although terms such as "top", "bottom", "front", "rear", "side" etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein for convenience only, for example, according to the directions of the examples described in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products available through commercial purchase.

[0030] Figure 1 It is a schematic three-dimensional assembly structure diagram of an embodiment of the all-pole-ear battery of the present invention.

[0031] Figure 2 It is a schematic three-dimensional structure diagram of the connecting piece in an embodiment of the all-pole-ear battery of the present invention.

[0032] Figure 3It is a schematic three-dimensional structure diagram of a core package in an embodiment of the all-pole-ear battery of the present invention.

[0033] Figure 4 It is a schematic connection structure diagram of a pole ear and a connecting piece in an embodiment of the all-pole-ear battery of the present invention.

[0034] Figure 5 It is a schematic partial assembly cross-sectional view of an embodiment of the all-pole-ear battery of the present invention.

[0035] Figure 6 It is a schematic diagram of the comparison of technical effects between the all-pole-ear battery of the present invention and the prior art.

[0036] As Figures 1 to 6 shown, according to one aspect of the present invention, a method for manufacturing an all-pole-ear battery is provided, which is applied to a battery with a rectangular cross-section of the all-pole-ear. The first pole ear 21 protrudes from the left side of the short side of the rectangle, and the second pole ear 22 protrudes from the right side of the short side of the rectangle. The first pole column 31 and the second pole column 32 and their mounting plate 3 are located at one end of the long side of the rectangle. The pole columns 31, 32 and the pole ears 21, 22 are both two and correspond to each other one by one. Each pair of pole columns and pole ears is electrically connected through a connecting piece, and the cross-section of the connecting piece is L-shaped.

[0037] According to an embodiment of the present invention, the connecting piece includes a first electrical connection part and a second electrical connection part. The first electrical connection part is electrically connected to the pole columns 31, 32, and the second electrical connection part is electrically connected to the pole ears 21, 22. The first electrical connection part and the second electrical connection part are arc-connected.

[0038] According to an embodiment of the present invention, a middle slot 7 is opened in the middle of the second electrical connection part. The pole ears 21, 22 pass through the middle slot 7 and are welded to the second electrical connection part in a fitting manner. The welding method is laser welding. Because the materials are the same, laser welding between them is simple and fast, and there will be no phenomenon of welding fracture and explosion welding due to different melting points of different metals. According to an embodiment of the present invention, the connection surfaces of the pole ears 21, 22 and the plane of the second electrical connection part are welded, and are trapezoidally distributed on both sides along the entire length of the protruding parts of the pole ears 21, 22.

[0039] According to an embodiment of the present invention, the length of the middle slot 7 is equal to or greater than the length of the protrusion of the pole ears 21, 22.

[0040] According to an embodiment of the present invention, each battery includes two core packages 2, and the two core packages 2 are placed side by side.

[0041] According to an embodiment of the present invention, the tabs 21 and 22 of the two core packages 2 pass through the middle slot 7 of the connecting piece together and are connected by ultrasonic welding or laser welding. Since the materials of the tabs and the connecting piece are the same, laser welding is simple and fast because of the same material, and there will be no phenomenon of welding fracture and explosion welding due to different melting points of different metals.

[0042] According to an embodiment of the present invention, the width of the positive tab of the full-tab battery is 80, and the width of the negative tab is 80, with the unit of millimeter.

[0043] According to an embodiment of the present invention, the total current-carrying area of the positive electrode foil of the full-tab battery is 124.8, and the total current-carrying area of the negative electrode foil is 126.72, with the unit of square millimeter.

[0044] According to another aspect of the present invention, a full-tab battery is provided, which is manufactured by the manufacturing method of the above full-tab battery.

[0045] As can be seen from the above technical solutions, the advantages and positive effects of the full-tab battery and its manufacturing method of the present invention are as follows:

[0046] In the process of manufacturing the battery electrode sheet, the present invention adopts the full-tab process. After stacking or winding, the positive and negative tabs extend from different sides respectively and are ultrasonically welded to form a core package, which increases the current-carrying area of the tabs without affecting safety.

[0047] The present invention can be applied to lithium batteries and also to sodium batteries.

[0048] Taking the manufacturing process of a square aluminum shell battery as an example, the following is the assembly process:

[0049] 1. The square aluminum shell battery in this embodiment includes a shell 1, a battery core package 2 and a top cover assembly 3. The shell 1 has an opening and houses the battery core package. The top cover assembly includes a top cover plate 3, a first pole column 31 and a second pole column 32. The top cover plate 3 is fixed to the shell 1 and covers the opening of the shell 1. A first pin 311 is connected to the first pole column 31, and a second pin 321 is connected to the second pole column 32.

[0050] 2. The full-tab electrode sheets that have been cut are made into a battery core package 2 by stacking / winding.

[0051] 3. A first tab 21 and a second tab 22 extend from each battery core package 2, and the first tab 21 and the second tab 22 are respectively subjected to tab ultrasonic welding.

[0052] 4. Two battery cell packs are placed side by side, and elastic insulating parts 4 are placed on the mating surfaces with the top cover 3 above. The first tab 21 is connected to the first pin 311, the second tab 22 is connected to the second pin 321, and they are led out from the slot 7, and are laser welded with the metal surfaces on both sides in contact respectively, as Figure 4 shown.

[0053] 5. Fit the holding bracket 8 with the first pin 311, connect the holding bracket 9 with the second pin 321, the pins are processed with openings 7, and the holding bracket is designed with a rivet structure for effective fixation.

[0054] 6. The above overall structure is encapsulated with a transparent insulating film 5.

[0055] 7. The encapsulated overall structure is put into a shell, and the aluminum shell 1 and the upper cover plate 3 are laser welded and sealed.

[0056] After completing the above steps, the assembly is completed.

[0057] 1. In the process of manufacturing the battery electrode sheet, the present invention adopts the full-tab process. After stacking or winding, the positive and negative tabs extend from different sides respectively and are ultrasonically welded to form a cell pack, increasing the current-carrying area of the tabs without affecting safety.

[0058] 2. In order to take into account the traditional top cover assembly and welding method, the connecting piece is led out from the lower terminal of the pole column and extends downward to the left and right end faces of the battery. The extending part is integrally L-shaped, greatly increasing the current-carrying area of the connecting piece.

[0059] 3. In order to facilitate welding, a slot is opened in the middle of the extending part of the connecting piece to facilitate the tabs to pass through and be welded in contact with the metal parts on both sides. Laser welding is used for welding.

[0060] As Figure 6 shown, compared with the prior art, in the case of the same cell size, the sizes of the tabs and the connecting piece become larger, resulting in an increase in the current-carrying area of the foil. Finally, through the conduction of the same-sized terminals, the overall current-carrying capacity of the battery is enhanced by 2.3 times. Among them, for the current-carrying coefficient per unit area, the smaller the number, the stronger the current-carrying ability.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention. Those of ordinary skill in the technical field to which the present invention pertains should understand that the specific structures and technological processes shown in the above specific implementation part are merely exemplary and not restrictive. Moreover, those of ordinary skill in the technical field to which the present invention pertains can combine the various technical features shown above in various possible ways to form new technical solutions, or make other modifications, all of which fall within the scope of the present invention.

Claims

1. A method for manufacturing a full-tab battery, which is applied to a battery with a full-tab rectangular cross section, characterized in that: The pole ears protrude on both sides of the short sides of the rectangle, the poles and their mounting plates are located at one end of the long sides of the rectangle, there are two poles and two pole ears, and they correspond to each other one by one, and each pair of poles and pole ears are electrically connected through a connecting piece, and the cross-section of the connecting piece is L-shaped.

2. The method for manufacturing a full-tab battery according to claim 1, characterized in that: The connecting piece includes a first electrical connecting portion and a second electrical connecting portion, the first electrical connecting portion is electrically connected to the pole, the second electrical connecting portion is electrically connected to the pole tab, and the first electrical connecting portion and the second electrical connecting portion are connected in an arc shape.

3. The method for manufacturing a full-tab battery according to claim 2, characterized in that: The second electrical connection portion has a middle slot, the electrode tab passes through the middle slot, and is welded to the second electrical connection portion.

4. The method for manufacturing a full-tab battery according to claim 3, characterized in that: The connecting surface of the pole ear is welded to the plane of the second electrical connection portion, and is distributed in a trapezoidal shape toward both sides along the entire length of the protruding portion of the pole ear.

5. The method for manufacturing a full-tab battery according to claim 3, characterized in that: The length of the middle slot is equal to or greater than the protruding length of the tab.

6. The method for manufacturing a full-tab battery according to claim 1, characterized in that: Each battery includes two core packs, which are placed side by side.

7. The method for manufacturing a full-tab battery according to claim 6, characterized in that: The pole ears of the two core packages pass through the middle slot of the connecting sheet together for welding connection.

8. The method for manufacturing a full-tab battery according to any one of claims 1 to 7, characterized in that: The positive electrode ear width of the full-electrode ear battery is 80, and the negative electrode ear width is 80.

9. The method for manufacturing a full-tab battery according to claim 8, characterized in that: The total flow area of ​​the positive electrode foil of the full-tab battery is 124.8, and the total flow area of ​​the negative electrode foil is 126.

72.

10. A full-tab battery, characterized in that: The battery is manufactured by the manufacturing method of the full-tab battery described in any one of claims 1-9.

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