CN109698385A - Secondary cell - Google Patents

Secondary cell Download PDF

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Publication number
CN109698385A
CN109698385A CN201710997124.5A CN201710997124A CN109698385A CN 109698385 A CN109698385 A CN 109698385A CN 201710997124 A CN201710997124 A CN 201710997124A CN 109698385 A CN109698385 A CN 109698385A
Authority
CN
China
Prior art keywords
support portion
patch
secondary cell
tab
main body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710997124.5A
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Chinese (zh)
Inventor
周勇
蔡如来
王鹏
李想
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN201710997124.5A priority Critical patent/CN109698385A/en
Publication of CN109698385A publication Critical patent/CN109698385A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The present invention provides a kind of secondary cells comprising electrode assembly and the cap assembly being set to above electrode assembly.Electrode assembly includes main body and the first tab stretched out from main body, and the first tab includes first connecting portion, is fixed on cap assembly;And first bending part, it bends downward and is connected between main body and first connecting portion relative to first connecting portion.The secondary cell further includes the first patch, and the first patch includes the first support portion, is pasted on the downside of first connecting portion;And second support portion, the inside of the first bending part is bent downward and is pasted on relative to the first support portion.Wherein, the first patch with a thickness of 0.1mm~5mm, Young's modulus of elasticity is 1000MPa~10000MPa.The bending place of first support portion and the connection of the second support portion can have biggish active force, and the first support portion supports the first connecting portion of the first tab upwards under the action of the active force, to be fixed to the shape of the first tab.

Description

Secondary cell
Technical field
The present invention relates to field of batteries more particularly to a kind of secondary cells.
Background technique
Secondary cell generally includes electrode assembly, cap assembly and shell, and electrode assembly usually passes through tab and top cover Component connection, and electrode assembly needs to be put into shell after connecting with cap assembly.In order to improve the energy density of secondary cell, pole Ear needs to bend to reduce its space occupied.But since tab itself is very thin and flexible easy to crack, tab is being folded over It is easy to crack in journey, if do not fixed and supported tab, tab is easy to be pressed into electrode group by cap assembly The main body (main body includes positive electrode, negative electrode and isolation film) of part, so as to cause short circuit.The prior art is usually in pole Adhesive tape is attached on ear to avoid short circuit, but adhesive tape is soft, can not prevent the main body that electrode assembly is inserted into when lug bending.Separately Outside, the prior art also avoids short circuit by the way that backing plate is arranged between cap assembly and the main body of electrode assembly, but backing plate is pacified It is big to fill complex process, occupied space, meanwhile, in order to realize the installation of backing plate, backing plate is typically only capable to a part of support tab, according to The main body of electrode assembly is inserted into when not can avoid lug bending so.
Summary of the invention
In view of the problems in the background art, the purpose of the present invention is to provide a kind of secondary cell, it is avoided that pole Ear is inserted into the main body of electrode assembly, prevents short circuit, improves the security performance of secondary cell.
To achieve the goals above, the present invention provides a kind of secondary cells comprising electrode assembly and is set to electricity Cap assembly above the component of pole.Electrode assembly includes main body and the first tab stretched out from main body, and the first tab includes First connecting portion is fixed on cap assembly;And first bending part, it is bent downward relative to first connecting portion and is connected to master Between body and first connecting portion.The secondary cell further includes the first patch, and the first patch includes the first support portion, is pasted on The downside of first connecting portion;And second support portion, it is bent downward relative to the first support portion and is pasted on the first bending part Inside.Wherein, the first patch with a thickness of 0.1mm~5mm, Young's modulus of elasticity is 1000MPa~10000MPa.
Beneficial effects of the present invention are as follows:
In the secondary battery in accordance with the present invention, the first patch is as deformation occurs after the first lug bending, but due to First patch with a thickness of 0.1mm~5mm and Young's modulus of elasticity is 1000MPa~10000MPa, therefore the first support portion The bending place connected with the second support portion can have biggish active force, and the first support portion is upward under the action of the active force The first connecting portion of the first tab is supported, to be fixed to the shape of the first tab.Since the first support portion can be under Collateral support first connecting portion, therefore, when cap assembly pushes the first tab, the first support portion can be inserted into avoid the first tab Into the main body of electrode assembly, short circuit is prevented, improves the security performance of secondary cell.
Detailed description of the invention
Fig. 1 is a schematic diagram of the secondary cell according to the present invention in forming process, wherein the first tab is not turned under Folding.
Fig. 2 is a cross-sectional view of the secondary cell of Fig. 1.
Fig. 3 is another schematic diagram of the secondary cell of Fig. 1, and one of electrode assembly, the first patch and the second patch save Slightly.
Fig. 4 is secondary cell according to the present invention schematic diagram after molding.
Fig. 5 is the exploded view of Fig. 4.
Fig. 6 is a cross-sectional view of Fig. 4.
Fig. 7 is a schematic diagram of cap assembly in Fig. 4.
Wherein, the reference numerals are as follows:
1 electrode assembly, 211 liquid injection hole
11 main body, 22 first electrode terminal
111 upper surface, 23 first connection sheet
12 first tab, 3 first patch
121 first connecting portion, 31 first support portion
122 first bending part, 32 second support portion
13 second tab, 33 third support portion
131 second connecting portions 4 weld screening glass
132 second bending part, 5 second patch
The 4th support portion of 2 cap assembly 51
The 5th support portion of 21 coping plate 52
Specific embodiment
Carry out the secondary cell that the present invention will be described in detail with reference to the accompanying drawings.
The noun of locality (such as top, downside and inside) occurred in present invention description is the direction shown in Fig. 4~6.
Referring to fig. 4 to fig. 6, secondary cell according to the present invention includes electrode assembly 1 and is set to above electrode assembly 1 Cap assembly 2.Electrode assembly 1 is included including main body 11 and the first tab 12 stretched out from main body 11, the first tab 12 First connecting portion 121 is fixed on cap assembly 2;And first bending part 122, it is bent downward simultaneously relative to first connecting portion 121 And it is connected between main body 11 and first connecting portion 121.The secondary cell further includes the first patch 3, and the first patch 3 includes First support portion 31, is pasted on the downside of first connecting portion 121;And second support portion 32, relative to the first support portion 31 to Lower bending and the inside for being pasted on the first bending part 122.Wherein, the first patch 3 with a thickness of 0.1mm~5mm, Young elasticity Modulus is 1000MPa~10000MPa.Further, the thickness of the first patch 3 is preferably 0.5mm~2.5mm, Young springform Amount is preferably 4000MPa~6000MPa.The PET etc. of electrolyte resistance corrosion can be selected in the material of first patch 3.
The main body 11 of electrode assembly 1 includes opposite polarity first electrode, second electrode and by first electrode and second The isolation film that electrode separates.First electrode, second electrode and isolation film can be winding-structure, can also be stepped construction.First pole Ear 12 can be cut by first electrode, and the first tab 12 of each electrode assembly 1 can be the multilayered structure welded together.When So, the first tab 12 can also be the individual components for being welded in first electrode.
The secondary cell further includes shell (not shown), and electrode assembly 1 is contained in shell, and cap assembly 2 and shell Body connection, electrode assembly 1 is sealed in shell.
First cap assembly 2 and electrode assembly 1 are horizontally disposed with, together referring to Fig. 3 when assembling secondary cell of the invention When the first tab 12 is horizontally fixed on cap assembly 2, then, referring to Figures 1 and 2, in the surface mount of the first tab 12 First patch 3;Finally, bending the first tab 12 referring to fig. 4 to fig. 6 electrode assembly 1 to be folded into the lower section of cap assembly 2. First connecting portion 121 is formed after the bending of first tab 12 and the first bending part 122, the first patch 3 are bent with the first tab 12 And form corresponding first support portion 31 and the second support portion 32.
In the secondary battery in accordance with the present invention, deformation occurs after the first patch 3 is bent with the first tab 12, but by It is 1000MPa~10000MPa in the Young's modulus of elasticity of the first patch 3, therefore the first support portion 31 and the second support portion 32 connect The bending place connect can have biggish active force, and the first support portion 31 supports the first tab upwards under the action of the active force 12 first connecting portion 121, to be fixed to the shape of the first tab 12.Due to the first support portion 31 can under it is collateral First connecting portion 121 is supportted, therefore, when cap assembly 2 pushes the first tab 12, the first support portion 31 can be to avoid the first tab 12 are inserted into the main body 11 of electrode assembly 1, prevent short circuit, improve the security performance of secondary cell.
Referring to figure 5 and figure 6, the first patch 3 may also include the third support portion 33 for being pasted on the upper surface 111 of main body 11, Second support portion 32 is connected between the first support portion 31 and third support portion 33.The first patch had both can be improved in third support portion 33 The integral strength of piece 3, while the first connecting portion 121 of the first tab 12 and the upper surface 111 of main body 11 can also be separated.
Referring to Fig. 4 to Fig. 7, cap assembly 2 includes coping plate 21 and the first electrode terminal 22 for being set to coping plate 21, And first connecting portion 121 is electrically connected to first electrode terminal 22.First electrode terminal 22 may pass through coping plate 21 and be projected into top 21 upside of cover plate, in order to be connect with external other components.
Referring to figure 5 and figure 6, cap assembly 2 further includes the first connection sheet 23, is connected to first connecting portion 121 and the first electricity Between extreme son 22;First support portion 31 is located at the downside of the first connection sheet 23 and the first connection sheet 23 of covering.In order to save sky Between, improve the energy density of secondary cell, the distance between upper surface 111 of the first connection sheet 23 and main body 11 very little, therefore, When shaking in the use process of secondary cell, the first connection sheet 23 is easy to the upper surface 111 of contact main body 11 and leads Cause short circuit.It, can be effectively by the first connection sheet 23 and main body by the first support portion 31 of setting the first connection sheet 23 of covering 11 upper surface 111 separates, and avoids short circuit, improves the security performance of secondary cell.
Referring to Fig. 3 and Fig. 6, the secondary cell further include: welding screening glass 4 is fixed on 121 downside of first connecting portion, First support portion 31 is located at the downside of welding screening glass 4 and covering welding screening glass 4.Welding screening glass 4 can be in welding process The first tab 12 of middle protection and the bonding strength for improving first connecting portion 121 and the first connection sheet 23.
Due in the assembling process of electrode assembly 1 and cap assembly 2, needing using multi-pass welding process, therefore also Various particles can be generated, and the first patch 3 can adsorb the particle that welding generates to a certain extent, and particle is avoided to fall into main body 11, reduce various risks caused by particle.
Referring to Fig. 3 to Fig. 7, coping plate 21 has liquid injection hole 211;First support portion 31 of the first patch 3 extends to fluid injection The downside in hole 211.When injecting electrolyte into the shell of secondary cell by liquid injection hole 211, if electrolyte directly washes away Main body 11 (the especially isolation film of main body 11), it is easy to cause 1 low-voltage of electrode assembly, short circuit, K value relatively low (unit time Interior voltage drop).And since the first support portion 31 of the first patch 3 extends to the downside of liquid injection hole 211, it can be with first Support portion 31 can directly wash away main body 11 to avoid electrolyte, improve performance and the service life of secondary cell.
First patch 3 is equipped with insulating cement close to the surface of the side of the first tab 12.That is, the first patch 3 passes through Insulating cement pastes on the first tab 12.Meanwhile insulating cement additionally aids the particle that absorption welding is formed.
Referring to fig. 4 to fig. 6, electrode assembly 1 is multiple, 1 through-thickness of multiple electrodes component arrangement, and the multiple electricity All first tab, 12 through-thickness of pole component 1 form two groups.First tab 12 of each group is adjacent to each other and is fixed on one It rises.First support portion, 31 through-thickness extends and covers the first connecting portion 121 of two group of first tab 12 simultaneously;Second support Portion 32 is two, through-thickness, and two the second support portions 32 are located at the two sides of the first support portion 31, and each second support Portion 32 is pasted on the inside of the first bending part 122 of corresponding one group of first tab 12.Referring to figure 5 and figure 6, first patch 3 The first tab 12 of multiple electrodes component 1 can be covered simultaneously, so as to effectively simplify barbola work, improved efficiency.
Further, referring to figure 5 and figure 6, the first patch 3 may also include two third support portions 33, each third support portion 33 are pasted on the upper surface 111 of main body 11 and are connected with corresponding second support portion 32, and the first support portion 31, the second support portion 32 and third support portion 33 be integrally formed.
Referring to Fig. 5, electrode assembly 1 further includes the second tab 13 stretched out from main body 11, and the second tab 13 includes second Interconnecting piece 131 is fixed on cap assembly 2;And second bending part 132, it bends downward and connects relative to second connecting portion 131 Between main body 11 and second connecting portion 131.The secondary cell further includes the second patch 5, and the second patch 5 includes the 4th Support part 51 is pasted on the downside of second connecting portion 131;And the 5th support portion 52, it is bent downward relative to the 4th support portion 51 And it is pasted on the inside of the second bending part 132;Wherein, the second patch 5 with a thickness of 0.1mm~5mm, Young's modulus of elasticity is 1000MPa~10000MPa.
The structure and function of second patch 5 is identical as the first patch 3.Four support portions 51 of the second patch 5 can be to avoid Two tabs 13 are inserted into the main body 11 of electrode assembly 1, prevent short circuit, improve the security performance of secondary cell.

Claims (10)

1. a kind of secondary cell, including electrode assembly (1) and the cap assembly (2) being set to above electrode assembly (1);
Electrode assembly (1) includes main body (11) and the first tab (12) from the middle stretching of main body (11), the first tab (12) tool Have:
First connecting portion (121) is fixed on cap assembly (2);And
First bending part (122) bends downward relative to first connecting portion (121) and is connected to main body (11) and the first connection Between portion (121);
It is characterized in that,
The secondary cell further includes the first patch (3), and the first patch (3) includes
First support portion (31), is pasted on the downside of first connecting portion (121);And
Second support portion (32) bends downward relative to the first support portion (31) and is pasted on the interior of the first bending part (122) Side;
Wherein, the first patch (3) with a thickness of 0.1mm~5mm, Young's modulus of elasticity is 1000MPa~10000MPa.
2. secondary cell according to claim 1, which is characterized in that the first patch (3) further includes being pasted on main body (11) Upper surface (111) third support portion (33), the second support portion (32) is connected to the first support portion (31) and third support portion (33) between.
3. secondary cell according to claim 1, which is characterized in that cap assembly (2) includes coping plate (21) and sets It is placed in the first electrode terminal (22) of coping plate (21), and first connecting portion (121) is electrically connected to first electrode terminal (22).
4. secondary cell according to claim 3, which is characterized in that
Cap assembly (2) further includes the first connection sheet (23), be connected to first connecting portion (121) and first electrode terminal (22) it Between;
First support portion (31) is located at the downside of the first connection sheet (23) and covering the first connection sheet (23).
5. secondary cell according to claim 4, which is characterized in that the secondary cell further include: welding screening glass (4), it is fixed on the downside of first connecting portion (121), the first support portion (31) is located at the downside of welding screening glass (4) and covering welding Screening glass (4).
6. secondary cell according to claim 3, which is characterized in that
Coping plate (21) has liquid injection hole (211);
The first support portion (31) of first patch (3) extends to the downside of liquid injection hole (211).
7. secondary cell according to claim 1, which is characterized in that the one of the first patch (3) close first tab (12) The surface of side is equipped with insulating cement.
8. secondary cell according to claim 1, which is characterized in that
Electrode assembly (1) is multiple, multiple electrodes component (1) through-thickness arrangement, and the institute of the multiple electrode assembly (1) There is the first tab (12) through-thickness to form two groups;
First support portion (31) through-thickness extends and covers the first connecting portion (121) of two group of first tab (12) simultaneously;
Second support portion (32) is two, and through-thickness, two the second support portions (32) are located at the first support portion (31) Two sides, and each second support portion (32) is pasted on the inside of the first bending part (122) of corresponding one group of first tab (12).
9. secondary cell according to claim 8, which is characterized in that the first patch (3) further includes two third support portions (33), each third support portion (33) is pasted on the upper surface (111) of main body (11) and is connected with corresponding second support portion (32), And first support portion (31), the second support portion (32) and third support portion (33) are integrally formed.
10. secondary cell according to claim 1, which is characterized in that
Electrode assembly (1) further includes the second tab (13) stretched out from main body (11), and the second tab (13) includes the second connection Cap assembly (2) are fixed in portion (131);And second bending part (132), it is bent downward simultaneously relative to second connecting portion (131) It is connected between main body (11) and second connecting portion (131);
The secondary cell further includes the second patch (5), and the second patch (5) includes the 4th support portion (51), is pasted on the second company The downside of socket part (131);And the 5th support portion (52), it is bent downward relative to the 4th support portion (51) and to be pasted on second curved The inside of folding part (132);Wherein, the second patch (5) with a thickness of 0.1mm~5mm, Young's modulus of elasticity be 1000MPa~ 10000MPa。
CN201710997124.5A 2017-10-20 2017-10-20 Secondary cell Pending CN109698385A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710997124.5A CN109698385A (en) 2017-10-20 2017-10-20 Secondary cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710997124.5A CN109698385A (en) 2017-10-20 2017-10-20 Secondary cell

Publications (1)

Publication Number Publication Date
CN109698385A true CN109698385A (en) 2019-04-30

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Family Applications (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112332039A (en) * 2020-01-17 2021-02-05 宁德时代新能源科技股份有限公司 Secondary battery, battery module, and device using battery as power supply
WO2021023060A1 (en) * 2019-08-07 2021-02-11 江苏时代新能源科技有限公司 Secondary battery and battery pack
CN112599935A (en) * 2020-12-14 2021-04-02 天津市捷威动力工业有限公司 Lithium ion power soft package battery tab and manufacturing method of battery
WO2021102638A1 (en) * 2019-11-25 2021-06-03 宁德时代新能源科技股份有限公司 Battery cell, battery module, battery pack, device using battery cell as power supply, and method for assembling battery cell

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021023060A1 (en) * 2019-08-07 2021-02-11 江苏时代新能源科技有限公司 Secondary battery and battery pack
WO2021102638A1 (en) * 2019-11-25 2021-06-03 宁德时代新能源科技股份有限公司 Battery cell, battery module, battery pack, device using battery cell as power supply, and method for assembling battery cell
CN112332039A (en) * 2020-01-17 2021-02-05 宁德时代新能源科技股份有限公司 Secondary battery, battery module, and device using battery as power supply
CN112599935A (en) * 2020-12-14 2021-04-02 天津市捷威动力工业有限公司 Lithium ion power soft package battery tab and manufacturing method of battery

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