(19) China National Intellectual Property Administration
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`(12) Invention Patent Application
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`(10) Application Publication No.: CN 101826609 A
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`(43) Application Publication Date: Sep 8, 2010
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`(21) Application No.: 200910311927.6
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`(22) Application Date: Dec 22, 2009
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`(71) Applicant: Hunan Keba Automobile Power
`Battery Limited Liability Company
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`Address: 348 Tongzipo West Rd., Lugu
`National High- and New-Technology
`Industrial Development Zone,
`Changsha, Hunan 410205
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`(72) Inventor: DENG Jiangnan YANG Yanan
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`(74) Patent Agency: Changsha Xingyao Patent Firm
`43205
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`Agent: NING Xingyao
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`(51) Int. Cl.
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`H01M 2/26 (2006.01)
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`Claims: 1 page Description: 2 pages Drawings: 2 pages
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`(54) Name of Invention
`METHOD FOR CONNECTING ELECTRODE AND TAB OF
`BATTERY
`(57) Abstract
`A method for connecting an electrode and a tab of a battery; the
`method is as follows: before welding, at least 1 notch is made at a to-be-
`welded area on the tab or the electrode, the notch being in a direction
`perpendicular to a welding direction; then the electrode and the tab are
`connected by welding to form a whole. This method can effectively
`reduce warping of a current collector and improve electrical performance
`of the battery; in addition, this method is simple in this technique and
`easy to operate.
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`C101826609 A
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`

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`CN 101826609 A CLAIMS Page 1 of 1
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`1. A method for connecting an electrode and a tab of a battery using welding, wherein before
`welding, at least 1 notch is made at a to-be-welded area on the tab or the electrode, the notch being in a
`direction perpendicular to a welding direction; then the electrode and the tab are connected by welding to
`form a whole.
`2. A method for connecting an electrode and a tab of a battery of claim 1, wherein the sum of widths
`of all the notches is less than a length of the to-be-welded area of the tab or the electrode, and a length of
`each of the notches is less than a width of an overlay connection portion of the tab between the tab and
`the electrode.
`3. A method for connecting an electrode and a tab of a battery of claim 1 or 2, wherein the number
`of notches is 2-10.
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`2
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`CN 101826609 A DESCRIPTION Page 1 of 2
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`METHOD FOR CONNECTING ELECTRODE AND TAB OF BATTERY
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`TECHNICAL FIELD
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`[0001] The present invention relates to a method for connecting components inside a battery and more
`particularly to a method for connecting an electrode and a tab of a battery.
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`BACKGROUND
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`[0002] Among components in a battery, current collector connection comprises connection between a tab
`and a center pin and connection between a tab and an electrode; the former typically uses riveting,
`welding, or a combination of both, and the latter typically uses electric resistance welding. Currently, the
`whole welding area is continuous in the welding of the tab and the electrode. In the welding process, the
`accumulation of heat and stress cannot be eliminated. Therefore, this welding method easily results in
`deformation caused by heat and stress accumulation. The accumulation of the deformation will lead to
`serious warping of the tab or wrinkling of the welding area of the electrode, and such deformation is
`detrimental to electrical performance of the battery.
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`SUMMARY
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`[0003] The purpose of the present invention is to provide a method for connecting an electrode and a tab
`of a battery, the method featuring simple techniques and little deformation of connecting components.
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`[0004] The technical solution provided by the present invention is as follows: before welding, at least one
`notch is made at a to-be-welded area on the tab or the electrode, the notch being in a direction
`perpendicular to a welding direction; then the electrode and the tab are connected by welding using a
`conventional welding method so that they are connected to form a whole (the electrode and the tab are
`welded together into a member called current collector).
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`[0005] A width direction of the notch is defined as an axis direction of the notch parallel to the welding
`direction, and a length direction of the notch is an axis direction perpendicular to the width direction of
`the notch. Directions of the tab are perpendicular to the directions of the notch; in other words, a length
`direction of the tab is an axis direction of the tab parallel to the welding direction, and a width direction of
`the tab is an axis direction perpendicular to the welding direction. The sum of widths of all the notches is
`best if it is less than an effective welding length of the tab, and a length of each of the notches is best if it
`is less than a width of a mutually overlay connection portion between the tab and the electrode.
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`[0006] The number of notches may be selected based on current collector length, welding temperature,
`and welding direction for the electrode and the tab. In general, if the electrode and the tab are welded at
`the top, one notch will do. If the electrode and the tab are welded at the side, it is best to make a plurality
`of notches; in general, 2-10 are preferred.
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`[0007] In comparison with currently available connecting methods, the present invention changes the
`structure of a welding area of the tab or the electrode by making a notch at the welding area of the tab or
`the electrode, so that the welding area is discontinuous, and heat or deformation is also discontinuous and
`stops at the notch rather than accumulates into the next section. As a result, accumulation of heat in the
`welding is reduced, and accumulation of warping is also reduced. This enables reduction of warping of
`the current collector to a very large extent, demonstrates good results, and improves outcome of battery
`cell assembly, thereby enhancing electrical performance of batteries. In addition, this method is simple in
`this technique and delivers good operational performance.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`3
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`CN 101826609 A DESCRIPTION Page 2 of 2
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`[0008] FIGS. 1(a) and (b) are diagrams illustrating a notch configuration and its welding outcome in one
`embodiment (top welding) of the present invention;
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`[0009] FIGS. 2(a) and (b) are diagrams illustrating a currently available welding method and its outcome
`(top welding);
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`[0010] FIGS. 3(a) and (b) are diagrams illustrating a notch configuration and its welding outcome in
`another embodiment (side welding) of the present invention;
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`[0011] FIGS. 4(a) and (b) are diagrams illustrating a currently available welding method and its outcome
`(side welding).
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`DETAILED DESCRIPTION
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`[0012] Further description of the present invention is provided below in conjunction with embodiments.
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`[0013] Embodiment 1
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`[0014] This embodiment applies welding at the top, as illustrated in FIG. 1. FIG. 1a shows a notch
`configuration, and FIG. 1b shows an after-welding state. Before welding, a notch 2 is made at a to-be-
`welded area on an electrode 3, the notch being in a direction perpendicular to a welding direction (the
`direction is indicated by the dotted line in the drawing); then a tab 1 and the electrode 3 are welded to
`form a current collector 4. A width of the notch (distance A between two arrows in the drawing) is less
`than an effective welding length of the electrode 3 (distance B between two arrows), and a length of the
`notch (distance C between two arrows) is less than a width of an overlay connection portion between the
`tab and the electrode (distance D between two arrows). Observation under a magnification device finds
`that a welding portion 5 between the electrode and the tab is smooth without deformation or wrinkles.
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`[0015] FIG. 2 illustrates a scenario where welding is performed using a method provided by currently
`available technique under the same conditions. FIG. 2a shows a before-welding state (no notch), and FIG.
`2b shows an after-welding state. Observation under a magnification device finds that the welding area 5
`between the electrode and the tab has wrinkles 6.
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`[0016] Embodiment 2
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`[0017] This embodiment applies welding at the side, as illustrated in FIG. 3. FIG. 3a shows a notch
`configuration, and FIG. 3b on the right shows an after-welding state. Before welding, five notches 2 are
`made at a to-be-welded area on a tab 1, the notches being in a direction perpendicular to a welding
`direction (the direction is indicated by the dotted line in the drawing); then the tab 1 and an electrode 3 are
`welded to form a current collector 4. The sum of widths of all the notches (distance E between two arrows
`in the drawing) is less than an effective welding length of the tab (distance F between two arrows), and a
`length of each of the notches (distance G between two arrows) is less than a width of an overlay
`connection portion between the tab and the electrode (distance H between two arrows). Observation under
`a magnification device finds that a welding portion 5 between the electrode and the tab is smooth without
`deformation or wrinkles.
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`[0018] FIG. 4 illustrates a scenario where welding is performed using a method provided by currently
`available technique under the same conditions. FIG. 4a shows a before-welding state (no notch), and FIG.
`4b shows an after-welding state. Observation under a magnification device finds that the welding area 5
`between the electrode and the tab has wrinkles 6.
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`4
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`CN 101826609 A DRAWINGS ATTACHED TO DESCRIPTION Page 1 of 2
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`CN 101826609 A DRAWINGS ATTACHED TO DESCRIPTION Page 2 of 2
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`Acta Chinese Language Services, LLC
`www.actalanguage.com | (202)618-2307 | info@actalanguage.com | Gaithersburg, MD
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`CERTIFICATE OF ACCURACY
`
`
`
`I, Evelyn Garland, am competent to translate from Chinese into English and certify that the
`attached English language document(s) is a true and accurate translation of the original
`Chinese language document(s) CN101826609A to the best of my abilities.
`
` I
`
` further declare that the statement in the preceding paragraph is true, and I understand that
`false statements and the like are punishable by fine and imprisonment, or both, under Section
`1001 of Title 18 of the United States Code.
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`
`
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`Date: November 28, 2022
`
`
`Evelyn Yang Garland
`
`ATA Certified Translator, English<->Chinese
`Maryland Court Certified Interpreter, English<->Mandarin
`Chinese
`
`
`President
`Acta Chinese Language Services, LLC
`
`PO Box 3884
`Gaithersburg, MD 20885
`egarland@actalanguage.com, (202) 618-2307
`www.actalanguage.com
`
`
`
`slators4 N
`
`A
`
`Evelyn Yang Garland
`Chinese into English
`Certification #491044
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`VA
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`QS
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`Verify at www.atanet.orgWverify
`
`SSSA
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`aNgnslators4 Y
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`Evelyn Yang Garland
`English into Chinese
`Certification #491044
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`G
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`fied Tro0®
`
`Verify at www.atanet.org/verify
`
`

`

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