CN113629362A - Tab welding structure, storage battery assembly and manufacturing method thereof - Google Patents
Tab welding structure, storage battery assembly and manufacturing method thereof Download PDFInfo
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- CN113629362A CN113629362A CN202110917126.5A CN202110917126A CN113629362A CN 113629362 A CN113629362 A CN 113629362A CN 202110917126 A CN202110917126 A CN 202110917126A CN 113629362 A CN113629362 A CN 113629362A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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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
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- 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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- 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a tab welding structure, a storage battery assembly and a manufacturing method thereof. Utmost point ear welding structure includes: the bus bar is provided with a welding surface; the plurality of tabs are distributed in an array manner; the upper end edge of the tab is a bending part, and the bending part is welded to the welding surface of the bus bar. The storage battery assembly comprises the lug welding structure, and further comprises positive plates and negative plates, wherein the positive plates are the same in the number of lugs of one group of lug welding structure, the negative plates are the same in the number of lugs of the other group of lug welding structure, and the positive plates and the negative plates are distributed in a staggered mode. The manufacturing method comprises the steps of clamping, bending, assembling, welding and the like. According to the invention, the resistance value of electric connection is reduced by changing the structure of the tab, the discharge performance is effectively improved, and the start-stop performance of the EFB battery is effectively improved; in addition, the original production process and the forming die of the bus bar are not changed in the production process, and all performances of the storage battery assembly can be improved only by adding one bending step.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a tab welding structure, a storage battery assembly and a manufacturing method thereof.
Background
The grid is a key component in the lead storage battery, the production development process of the lead storage battery is reviewed, the traditional grid manufacturing technology is continuously innovated, and new technology is continuously developed from the initial development of a manual casting die to a later automatic grid casting machine, and from the continuous net pulling grid developed in the last 80 years to the continuous punching grid developed in recent years.
The current manufacturing process of the lead-acid storage battery grid mainly comprises gravity casting, expanded net pulling, net punching, continuous casting and continuous rolling and the like.
The positive and negative polar plates of the lead-acid battery are provided with lugs, and the currents generated by charging and discharging on the polar plates need to pass through the lugs and then exchange with the outside, so that the larger the sectional area of the lugs is, the smaller the internal resistance is, and the better the large-current discharge performance of the battery is. For most of the current automobile starting batteries, especially for the EFB batteries which are popular at present and start and stop, the internal resistance is reduced, and the charge and discharge performance and cold starting current performance (CCA) of the batteries are greatly enhanced. In addition, when the EFB battery is subjected to start-stop tests, the failed battery is dissected, and the main reason is found that the battery fails due to corrosion of the negative electrode tab, so that the strength of the tab is increased, the sectional area of the tab is increased, and the start-stop performance of the EFB battery can be effectively improved.
The sectional area of the tab is increased, so that the thickness of the tab can be increased, and the width of the tab can also be increased. The prior art generally adopts a method of increasing the thickness of the tab, which is also feasible, but needs a plurality of devices and devices, and can affect the production efficiency. If the width of the tab is increased, although the weight of the tab itself is not increased much, the width of the tab is increased, and the width of the corresponding bus bar must be increased accordingly, so that the weight of the bus bar is greatly increased, and the material cost is increased.
Disclosure of Invention
According to an aspect of the present invention, there is provided a tab welding configuration including:
the bus bar is provided with a welding surface;
the plurality of tabs are distributed in an array and are parallel to each other;
the upper end edge of the tab is a bending part, and the bending part is welded to the welding surface of the bus bar.
The invention provides a welding structure between a lug and a bus bar, which is specially used for a lead-acid battery. Through the structure, the sectional area of the tab can be increased, the resistance value of electric connection can be reduced, and the discharge performance can be improved under the conditions of saving materials and not influencing the production efficiency; meanwhile, the sectional area of the tab is increased, and the start-stop performance of the EFB battery is effectively improved.
In some embodiments, the bus bar is provided with a first side extending along the X-axis direction and a second side extending along the Y-axis direction, and the plurality of tabs are distributed in an array along the Y-axis direction.
Thus, the tabs are arranged as described above.
In some embodiments, the upper end of the bend is embedded in the weld face.
This improves the tightness of the weld.
In some embodiments, the lower end edge of the tab is a flat portion.
The flat portion is thereby used in connection with the pole plate.
In some embodiments, the width of the straight portion is greater than the width of the bent portion.
Thus, the tab structure of the present structure is as described above.
According to another aspect of the present invention, there is also provided a battery assembly including the tab welding configuration described above, noted as a first tab welding configuration and a second tab welding configuration, and further including,
the positive plates and one group of the positive plates are welded to form a plurality of tabs, and the tabs of the group of the tabs are integrally formed with the positive plates respectively;
the negative electrode plates and the other group of lugs are welded to form a plurality of lugs, and the lugs of the group of lugs are integrally formed with the negative electrode plates respectively;
the positive plates and the negative plates are distributed in a staggered mode.
The present invention also provides a battery pack to which the above welding structure is applied, as one example of the welding structure.
In some embodiments, the battery assembly further includes a plurality of separators, and the plurality of separators are disposed around the plurality of negative or positive plates to separate adjacent negative or positive plates.
Thus, the separator separates the adjacent negative and positive electrode plates.
In some embodiments, the battery assembly further comprises two electrical connection elements, wherein one electrical connection element is disposed on and electrically connected to one of the sets of busbars and the other electrical connection element is disposed on and electrically connected to the other set of busbars.
Thus, the power receiving element is a power receiving electrode of the battery pack.
In some embodiments, the flat portion of the tab is integrally formed to the edge of the negative or positive electrode plate, and reinforcing portions are provided at both sides of a connection position of the flat portion and the negative or positive electrode plate.
Thus, the reinforcing portion reinforces the toughness of the tab and the negative or positive electrode plate.
According to another aspect of the present invention, there is also provided a manufacturing method including the above-described battery assembly, further including the steps of,
clamping: simultaneously clamping the straight parts of the negative plate/positive plate and the lug;
bending: bending or folding one end of the tab to form a bent part at one end edge of the tab;
assembling;
welding: and cast-welding the bent parts of the lugs to the welding surface of the busbar.
The invention also provides a manufacturing method of the storage battery assembly, which is one embodiment of the manufacturing method of the storage battery assembly.
The beneficial effects of the invention are embodied as follows: by changing the structure of the tab, the resistance value of electric connection is reduced, the discharge performance is effectively improved, and the start-stop performance of the EFB battery is effectively improved; in addition, the original production process and the forming die of the bus bar are not changed in the production process, and all performances of the storage battery assembly can be improved only by adding one bending step.
Drawings
Fig. 1 is a schematic perspective view of a tab welding structure according to an embodiment of the present invention.
Fig. 2 is a front view schematically illustrating a tab welding structure shown in fig. 1.
Fig. 3 is a schematic perspective view illustrating a tab in the tab welding structure of fig. 1.
Fig. 4 is a schematic top view of a tab in the tab welding configuration shown in fig. 1.
Fig. 5 is a perspective view illustrating a battery pack to which the tab welding structure of fig. 1 is applied.
Fig. 6 is a perspective view of the battery module shown in fig. 5 with separators removed.
Fig. 7 is a perspective view illustrating a plate of the battery module shown in fig. 5.
Fig. 8 is a front view structural diagram and a side view structural diagram of a tab welding structure in the related art before increasing the width.
Fig. 9 is a front view structural diagram and a side view structural diagram of a tab welding structure in the related art after increasing the width.
Fig. 10 is a schematic perspective view illustrating a tab in a tab welding structure according to another embodiment of the present invention.
Fig. 11 is a schematic perspective view illustrating a tab in a tab welding structure according to another embodiment of the present invention.
Reference numbers in the figures: 1-tab welding structure, 11-bus bar, 11 a-welding surface, 111-first side, 112-second side, 12-tab, 121-bending part, 122-straight part, 123-reinforcing part, 2-positive plate, 3-negative plate, 4-separator and 5-electric element.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1-2 schematically show a tab welding construction 1 according to an embodiment of the present invention, including:
a bus bar 11 provided with a welding surface 11 a;
the plurality of tabs 12 are distributed in an array mode, and the tabs 12 are parallel to each other;
the upper end edge of the tab 12 is a bent portion 121, and the bent portion 121 is cast-welded to the welding surface 11a of the busbar 11.
The invention provides a welding structure between a lug 12 and a bus bar 11, which is specially used for a lead-acid battery. Through the structure, the sectional area of the tab 12 can be increased, the resistance value of electric connection can be reduced, and the discharge performance can be improved under the conditions of saving materials and not influencing the production efficiency; meanwhile, the sectional area of the tab 12 is increased, and the start-stop performance of the EFB battery is effectively improved.
To better explain each component in the present embodiment, the X, Y, Z-axis three-dimensional concept is introduced into the present embodiment, and each component of the present embodiment is explained in detail. Wherein, the thickness direction of the bus bar 11 is taken as the Z axis, the width direction is taken as the X, and the length direction is taken as the Y; the plane formed by the X axis and the Z axis is an XZ plane, the plane formed by the X axis and the Y axis is an XY plane, and the plane formed by the Y axis and the Z axis is a YZ plane. Moreover, with reference to fig. 1, the positive direction of the X-axis is the right-side direction, and the negative direction is the left-side direction; the positive direction of the Z axis is the upper side direction, otherwise, the lower side direction is the lower side direction; the forward direction of the Y-axis is the anterior lateral direction, and vice versa the posterior lateral direction.
Referring to fig. 1, the busbar 11 has a first side 111 extending in the X-axis direction and a second side 112 extending in the Y-axis direction, the first side 111 being shorter and the second side 112 being longer; the welding surface 11a is a lower end surface of the bus bar 11, and the plurality of bent portions 121 are distributed in an array along the Y-axis direction and welded to the welding surface 11 a.
In this embodiment, a part of the upper end of the bent portion 121 is embedded and welded to the welding surface 11a, and the plurality of tabs 12 are distributed in a flat manner. The welding tightness of the pole lug can be improved.
With reference to fig. 3-4, the lower end edge of the tab 12 is a flat portion 122. The flat 122 is for connection to the plate.
Referring to fig. 3-4, the width of the straight portion 122 is greater than the width of the bending portion 121. The tab 12 of this configuration has the above-described structure.
Through the simple welding structure, the important problems in the industry are solved. Conventionally, in order to increase the sectional area of the tab 12, it is common to increase the thickness of the tab 12 or increase the width of the tab 12.
The conventional method has the defects that when the original dimensions are set as a, b and c respectively for the thickness, the width and the length of the busbar 11, the width d of the tab 12 (generally, the width of b is about 5mm than the width of d), the length e of the tab 12, the thickness f of the tab 12 and the number of the tabs 12 are n in combination with fig. 8-9, the volume of the busbar 11 is as follows: vSink (C)The tab 12 has a volume: vPole(s)＝d*e*f*n。
With reference to fig. 8-9, when the width d of the tab 12 is increased to d1, the width of the busbar 11 is correspondingly increased from d to d1, and the volume of the busbar 11 is: vSink 1＝a*b1C, the volume of the tab 12 is: vPole(s)＝d1*e*f*n。
In order to embody the data, the above codes are substituted by the actual data of a certain battery, which is shown in the following table:
in the above table, the width of the tab 12 is increased from 13mm to 2mm to 15mm, and the volume of the tab 12 is increased by 90mm3The volume of the bus bar 11 is increased by 350mm3It can be seen that the increase of the width of the tab 12 can cause the volume of the bus bar 11 to be increased greatly, thereby increasing the cost. The increase of the width of the tab 12 will result in that the forming mold of the bus bar 11 cannot be used in common with the prior art, and the design and manufacture need to be widened again, which will further increase the cost.
With this welding configuration, the above problems can be solved just effectively. The structure is a technical scheme for increasing the width of the tab 12 without increasing the width of the bus bar 11. After widening the tab 12, bending or folding the tab 12 by using a tooling device to reduce the width of the tab 12 from d1 to d after widening, as shown in fig. 2; the tab 12 can be welded to the bus bar 11 of the original size.
With reference to fig. 10 to 11, it should be noted that the tab 12 may be bent into various shapes, and the shapes shown in fig. 10 to 11 may be completed by bending, and the tab is acceptable as long as the welded portion of the tab 12 is narrowed and the structural strength is not affected.
The welding structure is applied to the storage battery assembly, and the specific structure is as follows:
with reference to fig. 5-6, a battery assembly includes the tab welding configuration 1 described above, designated as a first tab welding configuration 1 and a second tab welding configuration 1, and further includes,
the number of the positive plates 2 is the same as that of the lugs 12 of the first lug welding structure 1, and the lugs 12 of the first lug welding structure 1 are respectively integrally formed with the positive plates 2; in this embodiment, when the number of the tabs 12 is four, the number of the positive plates 2 is also four;
the number of the negative plates 3 is the same as that of the lugs 12 of the second lug welding structure 1, and the lugs 12 of the second lug welding structure 1 are respectively integrally formed with the negative plates 3; in the embodiment, when the number of the tabs 12 is four, the number of the negative electrode plates 3 is also four;
the positive plates 2 and the negative plates 3 are distributed in a staggered mode.
With reference to fig. 5-6, the battery assembly further includes a plurality of separators 4, and the plurality of separators 4 are disposed outside the plurality of negative plates 3 or the plurality of positive plates 2 to separate the adjacent negative plates 3 and the positive plates 2. The separator 4 separates the adjacent negative and positive electrode plates 3 and 2. In this embodiment, four separators 4 are also provided, and the four separators 4 are respectively sleeved outside the four positive plates 2.
With reference to fig. 5-6, the battery assembly further includes two electrical connection elements 5, wherein one electrical connection element 5 is disposed on one of the sets of bus bars 11 and electrically connected thereto, and the other electrical connection element 5 is disposed on the other set of bus bars 11 and electrically connected thereto. The power connection element 5 is a power connection electrode of the storage battery assembly.
With reference to fig. 7, the straight portion 122 of the tab 12 is integrally formed to the upper edge of the negative electrode plate 3 or the positive electrode plate 2, and the straight portion 122 is provided with the reinforced portion 123 on both sides of the connection position of the negative electrode plate 3 or the positive electrode plate 2, the reinforced portion 123 is in the shape of an inner circular horn, and the reinforced portion 123 is located on both sides of the straight portion 122. The reinforcing portion 123 reinforces the toughness of the tab 12 and the negative electrode plate 3 or the positive electrode plate 2. In the actual production, the tab 12 is integrally formed with the negative electrode plate 3/the positive electrode plate 2 by means of "die casting", "punching", or the like.
The method for manufacturing the battery pack further comprises the following steps,
s1, clamping: simultaneously clamping the flat portions 122 of the negative electrode plate 3, the positive electrode plate 2 and the tab 12; in this embodiment, the polar plate is clamped by using a mold.
S2, bending: bending or folding one end of the tab 12 by using a bending device and a clamping bending device to form a bending part 121 at one end edge of the tab 12;
s3, assembling: as shown in fig. 5 to 6, the electrode plates obtained by bending the tab 12 are arranged integrally;
s4, welding: and a plurality of tabs 12 are cast-welded to the welding surface 11a of the bus bar 11, and the plurality of tabs 12 are distributed flatly, so that the battery assembly is formed.
It should be noted that, in the actual production process, since the electrode plates cannot be stacked tightly after the electrode tabs 12 are deformed, that is, the electrode plates are not beneficial to storage, the treatment process cannot be put in the electrode plate manufacturing process, it is considered that the electrode tabs 12 are deformed by bending before the positive and negative electrodes are assembled together in the subsequent encapsulating process, the positive and negative electrode plates 3 are assembled after the electrode tabs 12 are deformed, and the bus bar 11 of the battery can be welded in the next process.
By changing the structure of the tab 12, the resistance value of electric connection is reduced, the discharge performance is effectively improved, and the start-stop performance of the EFB battery is effectively improved; in addition, the original production process and the forming die of the bus bar 11 are not changed in the production process, and all performances of the storage battery assembly can be improved only by adding one bending step.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. Utmost point ear welding structure, its characterized in that includes:
a bus bar (11) provided with a welding surface (11 a);
the plurality of tabs (12) are distributed in an array manner;
the upper end edge of the tab (12) is a bending part (121), and the bending part (121) is welded to a welding surface (11a) of the bus bar (11).
2. The tab welding structure according to claim 1, wherein the bus bar (11) is provided with a first side (111) extending along the X-axis direction and a second side (112) extending along the Y-axis direction, and a plurality of the tabs (12) are distributed in an array along the Y-axis direction.
3. The tab welding construction as set forth in claim 2, wherein the upper end of the bent portion (121) is partially embedded in the welding surface (11 a).
4. The tab welding construction as claimed in claim 1, wherein the lower end edge of the tab (12) is a flat portion (122).
5. The tab welding construction as claimed in claim 4, wherein the width of the straight portion (122) is greater than the width of the bent portion (121).
6. Battery assembly, characterized in that it comprises two sets of tab welding configurations (1) according to any one of claims 1 to 5, and also comprises
The number of the positive plates (2) is the same as that of the lugs (12) of one group of the lug welding structures (1), and the lugs (12) of the group of the lug welding structures (1) are respectively and integrally formed with the positive plates (2);
the negative plates (3) are the same as the lugs (12) of the other group of lug welding structure (1) in number, and the lugs (12) of the group of lug welding structure (1) are integrally formed with the negative plates (3) respectively;
the positive plates (2) and the negative plates (3) are distributed in a staggered mode.
7. The storage battery assembly according to claim 6, further comprising a plurality of separators (4), wherein the plurality of separators (4) are sleeved outside the plurality of negative electrode plates (3) or positive electrode plates (2) to separate the adjacent negative electrode plates (3) and positive electrode plates (2).
8. Battery pack according to claim 7, characterised by two electrical connection elements (5), one of said electrical connection elements (5) being arranged on and electrically connected to one of the busbars (11) of one of the groups and the other of said electrical connection elements (5) being arranged on and electrically connected to the busbar (11) of the other group.
9. The battery assembly according to claim 8, wherein the flat portion (122) of the tab (12) is integrally formed to an edge of the negative or positive electrode plate (3, 2), and reinforcing portions (123) are provided at both sides of a connection position of the flat portion (122) and the negative or positive electrode plate (3, 2).
10. A method of manufacture comprising the battery assembly of claim 8, further comprising the step of,
clamping: simultaneously clamping the flat portions (122) of the negative electrode plate (3)/the positive electrode plate (2) and the tab (12);
bending: bending or folding one end of the tab (12) to form a bent part (121) at one end edge of the tab (12);
assembling;
welding: the bent parts (121) of the tabs (12) are cast and welded to the welding surface (11a) of the bus bar (11).
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| CN202110917126.5A CN113629362A (en) | 2021-08-10 | 2021-08-10 | Tab welding structure, storage battery assembly and manufacturing method thereof |
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| CN202110917126.5A CN113629362A (en) | 2021-08-10 | 2021-08-10 | Tab welding structure, storage battery assembly and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113644356A (en) * | 2021-07-28 | 2021-11-12 | 东莞塔菲尔新能源科技有限公司 | Utmost point ear connection structure and battery of battery top cap |
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|---|---|---|---|---|
| CN113644356A (en) * | 2021-07-28 | 2021-11-12 | 东莞塔菲尔新能源科技有限公司 | Utmost point ear connection structure and battery of battery top cap |
| CN113644356B (en) * | 2021-07-28 | 2023-05-16 | 江苏正力新能电池技术有限公司 | Lug connection structure of battery top cover and battery |
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Application publication date: 20211109 |
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