WO2022105158A1 - 软包电池 - Google Patents

软包电池 Download PDF

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Publication number
WO2022105158A1
WO2022105158A1 PCT/CN2021/094428 CN2021094428W WO2022105158A1 WO 2022105158 A1 WO2022105158 A1 WO 2022105158A1 CN 2021094428 W CN2021094428 W CN 2021094428W WO 2022105158 A1 WO2022105158 A1 WO 2022105158A1
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WO
WIPO (PCT)
Prior art keywords
cylindrical
upper cover
lower cover
edge
outer ends
Prior art date
Application number
PCT/CN2021/094428
Other languages
English (en)
French (fr)
Inventor
李升高
韩子勤
胡大林
Original Assignee
曙鹏科技（深圳）有限公司
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Application filed by 曙鹏科技（深圳）有限公司 filed Critical 曙鹏科技（深圳）有限公司
Publication of WO2022105158A1 publication Critical patent/WO2022105158A1/zh

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • 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

Definitions

  • the present application belongs to the technical field of batteries, and in particular relates to a soft pack battery.
  • the soft pack battery has the advantages of good safety performance (unlike the steel shell aluminum shell battery will explode), light weight and so on.
  • the existing cylindrical soft-pack battery usually adopts the structure of the poles at both ends, the positive electrode at one end and the negative electrode at the other end.
  • the outer shell is formed by the combination of the upper shell formed by stamping and the lower shell formed by stamping. This structure makes the cylindrical soft pack battery lead out of the shell with only one pole ear. For multiple negative lugs, it needs to be re-welded inside the battery and then exported from a single lug. The inventor realized that this method will cause overcurrent heat conduction and limit the number of lead-out lugs, which is not conducive to high-rate charge and discharge. .
  • the technical problem to be solved by the present application is: in view of the problem that the existing soft-pack battery can only have one positive electrode lug and one negative electrode lug out of the case, which is not conducive to high-rate charge and discharge, a soft-pack battery is provided.
  • a soft-packed battery comprising a pole core, an upper cover punched from a flexible packaging film, a lower cover punched from the flexible packaging film, and a hollow battery rolled from the flexible packaging film.
  • the flexible packaging film includes a protective layer, a sealing layer and an intermediate metal layer disposed between the protective layer and the sealing layer;
  • the inner surface of the shell wall of the cylindrical shell is a sealing layer, the upper cover and the lower cover are cylindrical structures, and the outer surface of the cylindrical peripheral wall of the upper cover and the outer surface of the cylindrical peripheral wall of the lower cover are sealed. layer;
  • the sealing layer of the upper cover is connected with the sealing layer of the cylindrical case to seal the opening of the first end of the cylindrical case, and the sealing layer of the lower cover is sealed with the cylindrical case connecting the layers to seal the opening of the second end of the cylindrical casing, the upper cover, the cylindrical casing and the lower cover enclosing a sealed enclosure;
  • the pole core is accommodated in the outer shell, and the pole core leads out a plurality of positive electrode lugs and a plurality of negative electrode lugs, the outer ends of the plurality of positive electrode lugs protrude from the first end of the cylindrical shell, and the plurality of The outer ends of the positive lugs are connected together to form a network structure of the positive lugs, the outer ends of the plurality of negative lugs protrude from the second end of the cylindrical shell, and the outer ends of the plurality of negative lugs are connected together
  • the negative ear network structure is formed.
  • the outer ends of the plurality of positive electrode tabs are connected together by welding, and the outer ends of the plurality of negative electrode tabs are connected together by welding.
  • the cylindrical case has a cylindrical structure
  • the upper cover and the lower cover have a cylindrical structure matched with the cylindrical case.
  • the open end of the upper cover faces the outside of the cylindrical case, and a first edge sealing is formed on the cylindrical peripheral wall of the upper cover and the side wall of the cylindrical case;
  • the opening end of the lower cover faces the outer side of the cylindrical shell, and a second edge is formed on the cylindrical peripheral wall of the lower cover and the side wall of the cylindrical shell.
  • the outer ends of the plurality of positive electrode lugs protrude between the cylindrical peripheral wall of the upper cover and the side wall of the cylindrical case, and the outer ends of the plurality of negative electrode lugs extend from The cylindrical peripheral wall of the lower cover penetrates between the side wall of the cylindrical shell.
  • the first sealing edge is folded and attached to the outer surface of the bottom wall of the upper cover, and the second sealing edge is folded and attached to the outer surface of the bottom wall of the lower cover .
  • the upper cover includes two or more first sub-covers; the two or more first sub-covers are spliced to form the upper cover, and the open end of the upper cover faces the On the outer side of the cylindrical shell, a third edge is formed on the cylindrical peripheral wall of the upper cover and the side wall of the cylindrical shell, and a splicing part between each of the first sub-covers located in the upper cover is formed with a the fourth edge;
  • the lower cover includes two or more second sub-covers; the two or more second sub-covers are spliced to form the lower cover, the open end of the lower cover faces the outside of the cylindrical shell, and the lower cover is A fifth edge is formed on the peripheral wall of the cover and the side wall of the cylindrical shell, and a sixth edge is formed at the joint between the second sub-caps and located in the lower cover.
  • the outer ends of the plurality of the positive electrode tabs protrude from the splices located in the upper cover between the first sub-covers, and the outer ends of the plurality of the negative electrode tabs Passing through the splices in the lower cover between each of the second sub-covers.
  • the outer ends of a part of the negative electrode tabs protrude from the splices located in the lower cover between the second sub-covers, and the outer ends of the rest of the negative electrode tabs protrude from the
  • the cylindrical peripheral wall of the lower cover penetrates between the side wall of the cylindrical shell.
  • the third edge sealing and the fourth edge sealing are bent and attached to the outer surface of the bottom wall of the upper cover; the fifth edge sealing and the sixth edge sealing It is bent and attached to the outer surface of the bottom wall of the lower cover.
  • the flexible packaging film is an aluminum-plastic composite film
  • the protective layer is a nylon layer of the aluminum-plastic composite film
  • the sealing layer is a PP layer of the aluminum-plastic composite film
  • the intermediate metal layer is the aluminum foil layer of the aluminum-plastic composite film.
  • the pole core adopts a winding core, or the pole core adopts a battery cell with a laminated structure.
  • the beneficial effect of the soft-packed battery provided by the present application is that, compared with the prior art, by adopting an upper cover, a lower cover and a hollow cylindrical case rolled by a soft-packaging film to form a sealed case, the battery can be contained in the case.
  • the pole core with a plurality of positive electrode tabs and a plurality of negative electrode tabs can directly pass the plurality of positive electrode tabs from the first end of the cylindrical casing, and directly pass the plurality of negative electrode tabs from the second end of the cylindrical casing;
  • the outer ends of the outgoing positive lugs are connected together to form a positive lug network structure, and the outer ends of the outgoing negative lugs are connected together to form a negative lug network structure.
  • the positive lug network structure and the negative lug network structure greatly reduce the soft package
  • the battery impedance of the battery will not have the phenomenon of overcurrent and heat conduction, and realize the characteristics of high-rate charge and discharge.
  • the tab structure with a certain strength can be equivalent to replace the steel shell, and it can be used in direct contact with the electrical components.
  • the cylindrical shell does not need to be punched, the main body of the package will not have a draft angle, which improves the space utilization rate and greatly improves the energy density, and the cylindrical shell is not limited by the depth of the punching hole.
  • the use of thinner flexible packaging film breaks the restriction of deep pit technology, and can be formed into flexible battery casings of any size.
  • FIG. 1 is a schematic structural diagram of a soft-pack battery provided by an embodiment of the present application when the outer casing is not degassed;
  • FIG. 2 is an exploded view of a casing of a soft-pack battery provided by an embodiment of the present application
  • FIG. 3 is a cross-sectional view of a flexible packaging film provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a pouch battery with a network structure of positive electrodes provided by an embodiment of the present application
  • FIG. 5 is a schematic structural diagram when the first edge of FIG. 4 is bent and attached to the outer surface of the bottom wall of the upper cover;
  • FIG. 6 is a schematic structural diagram of an upper cover having two first sub-covers
  • FIG. 7 is a schematic structural diagram of a lower cover having two second sub-covers
  • FIG. 8 is a schematic structural diagram of the case of the soft-pack battery with the upper cover shown in FIG. 6 when the air bag is not removed;
  • FIG. 9 is a schematic structural diagram when the upper cover shown in FIG. 6 is provided, and the outer ends of the plurality of positive electrode tabs are protruded from the first end of the cylindrical housing;
  • FIG. 10 is a schematic structural diagram of a pouch battery using the upper cover shown in FIG. 6 and having a network structure of positive electrodes;
  • FIG. 11 is a schematic structural diagram of an upper cover having four first sub-covers
  • FIG. 12 is a schematic structural diagram of the case of the soft-pack battery without the air bag being removed from the case with the upper cover shown in FIG. 11 ;
  • FIG. 13 is a schematic structural diagram of a pouch battery using the upper cover shown in FIG. 11 and having a network structure of positive tabs.
  • the soft-pack battery provided by the embodiment of the present application includes a pole core, an upper cover 4 punched from a flexible packaging film, and a lower cover punched from the flexible packaging film. 5 and a hollow cylindrical shell 3 rolled from a flexible packaging film;
  • the flexible packaging film includes a protective layer 21, a sealing layer 22 and an intermediate metal layer 23 disposed between the protective layer 21 and the sealing layer 22;
  • the inner surface of the shell wall of the cylindrical shell 3 is the sealing layer 22
  • the upper cover 4 and the lower cover 5 are cylindrical structures, and the outer surface of the cylindrical peripheral wall of the upper cover 4 and the outer surface of the cylindrical peripheral wall of the lower cover 5 are the sealing layer 22;
  • the sealing layer of the upper cover 4 is connected to the sealing layer of the cylindrical case 3 to seal the opening of the first end of the cylindrical case 3, and the sealing layer of the lower cover 5 is connected to the sealing layer of the cylindrical case 3 to seal the cylindrical case 3.
  • the opening of the second end of the shell 3, the upper cover 4, the cylindrical shell 3 and the lower cover 5 are enclosed to form a sealed shell;
  • the pole core is accommodated in the outer casing, and the pole core leads out a plurality of positive electrodes 11 and a plurality of negative electrodes 12. Connected together to form a network structure of positive tabs, the outer ends of the plurality of negative tabs 12 protrude from the second end of the cylindrical casing 3, and the outer ends of the plurality of negative tabs 12 are connected together to form a network of negative tabs.
  • the positive electrode lug 11 and the negative electrode lug 12 are not particularly limited, and can be selected according to actual needs. For example, metal strips or metal sheets made of gold, platinum, aluminum, copper and other materials can be used; the pole core is not particularly limited.
  • the soft-pack battery provided by the embodiment of the present application adopts an upper cover 4, a lower cover 5 and a hollow cylindrical case 3 rolled by a soft packaging film to form a sealed casing, so that the battery contained in the casing is enclosed in a sealed casing.
  • the inner pole core with a plurality of positive tabs 11 and a plurality of negative tabs 12 can directly pass the plurality of positive tabs 11 from the first end of the cylindrical case 3 , and pass the plurality of negative tabs 12 from the first end of the cylindrical case 3 .
  • the two ends are directly pierced; the outer ends of the pierced positive lugs 11 are connected together to form a positive lug network structure, and the outer ends of the pierced negative lugs 12 are connected together to form a negative lug network structure, the positive lug network structure and the negative electrode
  • the ear network structure greatly reduces the battery impedance of the soft pack battery, and the phenomenon of over-current heat conduction will not occur, and the high-rate charge and discharge characteristics can be realized. use.
  • the cylindrical shell 3 does not need to be punched, the main body of the package will not have a draft angle, the space utilization rate is improved, and the energy density is greatly improved, and the cylindrical shell 3 is not limited by the depth of the punching hole. , which can use thinner flexible packaging film, breaking the restriction of deep-drawing pit technology, and can be formed into a soft-packing battery shell of any size.
  • the outer ends of the plurality of positive electrode tabs 11 are connected together by welding, and the outer ends of the plurality of negative electrode tabs 12 are connected together by welding.
  • the tab network structure can be formed by soldering, and the tab structure (positive tab network structure and negative tab network structure) with certain strength formed by welding can be equivalent to replace the steel shell and be used in direct contact with electrical components.
  • the cylindrical casing 3 has a cylindrical structure
  • the upper cover 4 and the lower cover 5 have a cylindrical structure matched with the cylindrical casing 3 .
  • the use of a cylindrical structure can improve the energy density of the pouch battery.
  • cylindrical housing 3, the upper cover 4 and the lower cover 5 can be obtained through the following steps:
  • the cylindrical shell 3 of this structure does not need to be punched, so that the cylindrical shell 3 does not generate a draft angle, improves the space utilization rate, greatly improves the energy density, and the cylindrical shell 3 will not be affected. Due to the limitation of the depth of the punching hole, a thinner flexible packaging film can be used, which breaks the restriction of the punching hole technology and can be formed into a soft-packed battery shell of any size.
  • the open end of the upper cover 4 faces the outside of the cylindrical casing 3, and a first edge 6 is formed on the peripheral wall of the upper cover 4 and the side wall of the cylindrical casing 3; specifically , the first edge 6 can be heat-sealed by a heat-sealing machine, so that the upper cover 4 is sealed at the opening of the first end of the cylindrical casing 3 .
  • the first edge sealing 6 can be conveniently heat-sealed by orienting the open end of the upper cover 4 toward the outside of the cylindrical housing 3 .
  • the open end of the lower cover 5 faces the outer side of the cylindrical casing 3, and the peripheral wall of the lower cover 5 and the side wall of the cylindrical casing 3 are formed with a second edge; specifically, the second edge can be heated by a heat sealing machine.
  • the lower cover 5 is sealed at the opening of the second end of the cylindrical casing 3 , and the second edge can be conveniently heat-sealed by orienting the opening end of the lower cover 5 toward the outside of the cylindrical casing 3 .
  • the outer ends of the plurality of positive electrode tabs 11 protrude from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical case 3 , and the outer ends of the plurality of negative electrode tabs 12 extend from the bottom.
  • the cylindrical peripheral wall of the cover 5 penetrates between the side wall of the cylindrical case 3 .
  • the positive electrode lug 11 protrudes from the opening of the first end of the cylindrical casing 3, the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical casing 3 are not heat-sealed to form the first sealing edge 6.
  • the positive electrode lugs 11 are passed through between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical casing 3 and then heat-sealed.
  • the negative electrode tab 12 protrudes from the opening of the second end of the cylindrical case 3
  • the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical case 3 are not heat-sealed to form a second sealing edge. Heat sealing is performed after passing through the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3 .
  • the first sealing edge 6 is bent and attached to the outer surface of the bottom wall of the upper cover 4;
  • the edge sealing is bent and attached to the outer surface of the bottom wall of the lower cover 5, and the first edge sealing 6 and the second edge sealing can be subjected to an embossing process.
  • the upper cover 4 includes more than two first sub-covers 41 ; the two or more first sub-covers 41 are spliced to form the upper cover 4 , and the open end of the upper cover 4 faces On the outside of the cylindrical housing 3, a third edge 7 is formed on the peripheral wall of the upper cover 4 and the side wall of the cylindrical housing 3, and a fourth edge is formed at the splicing between the first sub-covers 41 in the upper cover 4.
  • Edge sealing 8 wherein, the third edge sealing 7 and the fourth edge sealing 8 can be heat-sealed by a heat sealing machine, and the third edge sealing 7 and the third edge sealing Four edges 8 are heat-sealed.
  • the lower cover 5 includes more than two second sub-covers 51; the two or more second sub-covers 51 are spliced to form the lower cover 5, the open end of the lower cover 5 faces the outside of the cylindrical housing 3, and the cylindrical wall of the lower cover 5 is connected to the outer side of the cylindrical shell 3.
  • a fifth edge (not shown) is formed on the side wall of the cylindrical casing 3, and a sixth edge 9 is formed at the splicing position between the second sub-covers 51 in the lower cover 5; wherein, the fifth edge and the sixth edge sealing 9 can be heat-sealed by a heat sealing machine, and the fifth edge sealing and the sixth sealing edge 9 can be conveniently heat-sealed by orienting the open end of the lower cover 5 toward the outside of the cylindrical housing 3 .
  • the outer ends of the plurality of positive tabs 11 protrude from the splices located in the upper cover 4 between the first sub-covers 41 , and the outer ends of the plurality of negative tabs 12 protrude from the second sub-covers 51 .
  • the splicing point located in the lower cover 5 between them is pierced. In order to facilitate the subsequent formation of a plurality of positive tabs 11 to form a network of positive tabs, and a plurality of negative tabs 12 to form a network of negative tabs.
  • the outer ends of the plurality of positive electrode tabs 11 can also pass through between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical case 3
  • the outer ends of the plurality of negative electrode tabs 12 can also pass from below
  • the cylindrical peripheral wall of the cover 5 penetrates between the side wall of the cylindrical case 3 .
  • the outer ends of a part of the positive electrode tabs 11 protrude from the splicing position in the upper cover 4 between the first sub-covers 41 , The outer ends of the remaining positive electrode tabs 11 protrude from between the cylindrical wall of the upper cover 4 and the side wall of the cylindrical housing 3 , so as to facilitate the formation of a positive electrode tab network structure by a plurality of subsequent positive electrode tabs 11 .
  • the outer ends of a part of the negative tabs 12 protrude from the splices located in the lower cover 5 between the second sub-covers 51 , and the outer ends of the remaining negative tabs 12 protrude from the peripheral wall of the lower cover 5 It passes through the side wall of the cylindrical case 3, so as to facilitate the formation of a negative electrode network structure by a plurality of negative electrode tabs 12 subsequently.
  • the third sealing edge 7 and the fourth sealing edge 8 are bent and attached to the outer surface of the bottom wall of the upper cover 4;
  • the edge sealing and the sixth sealing edge 9 are bent and attached to the outer surface of the bottom wall of the lower cover 5 .
  • the flexible packaging film is an aluminum-plastic composite film
  • the protective layer 21 is a nylon layer of the aluminum-plastic composite film
  • the sealing layer 22 is a PP layer of the aluminum-plastic composite film
  • the intermediate metal layer 23 is an aluminum foil of the aluminum-plastic composite film.
  • the aluminum-plastic composite film has good compressive performance, heat sealing performance and sealing performance, which can effectively prevent battery leakage in the soft-pack button battery and prolong the service life of the soft-pack battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种软包电池，包括有多个正极耳（11）和负极耳（12）的极芯、由软包装膜冲压成的上盖（4）和下盖（5）以及由软包装膜卷成的中空的柱状壳体（3）；软包装膜包括保护层（21）、封合层（22）和位于两者之间的中间金属层（23）；柱状壳体（3）的壳壁内表面为封合层（22），上盖（4）的周壁外表面和下盖（5）的周壁外表面为封合层（22）；上盖（4）的封合层（22）与柱状壳体（3）的封合层（22）连接，下盖（5）的封合层（22）与柱状壳体（3）的封合层（22）连接，上盖（4）、柱状壳体（3）和下盖（5）形成密封的外壳；极芯容纳在外壳内，多个正极耳（11）的外端从柱状壳体（3）的第一端穿出并连接在一起形成正极耳网络结构，多个负极耳（12）的外端从柱状壳体（3）的第二端穿出并连接在一起形成负极耳网络结构。正极耳网络结构和负极耳网络结构极大地降低了软包电池的电池阻抗，实现大倍率充放电特性。

Description

软包电池
本申请要求于2020年11月18日提交中国专利局、申请号为202011294319.1，发明名称为“软包电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请属于电池技术领域，特别是涉及一种软包电池。
背景技术
软包电池，其具有安全性能好(不像钢壳铝壳电芯那样会发生爆炸)、重量轻等优点。
现有的圆柱软包电池，通常采用两端出极耳的结构，一端出正极，一端出负极，其极芯引出的正极和负极大多数情况下各只有一个，并且由于现有圆柱软包电池的外壳是通过由冲压形成的上壳和由冲压形成的下壳组合而成，此种结构使得圆柱软包电池引出到壳外的极耳只有一个，如果要极芯引出有多个正极耳和多个负极耳，则需要在电池内部转接焊后再由单个极耳导出，发明人意识到此种方式会出现过流导热，并且又限制了导出极耳的数量，不利于大倍率充放电。
技术问题
本申请所要解决的技术问题是：针对现有的软包电池引出到壳外的正极耳和负极耳各只能有一个，不利于大倍率充放电的问题，提供一种软包电池。
技术解决方案
本申请解决上述技术问题所采用的技术方案如下：提供一种软包电池，包括极芯、由软包装膜冲压成的上盖、由软包装膜冲压成的下盖以及由软包装膜卷成的中空的柱状壳体；所述软包装膜包括保护层、封合层和设置在所述保护层和所述封合层之间的中间金属层；
所述柱状壳体的壳壁内表面为封合层，所述上盖和所述下盖呈筒状结构，所述上盖的筒周壁外表面和所述下盖的筒周壁外表面为封合层；
所述上盖的封合层与所述柱状壳体的封合层连接以密封所述柱状壳体的第一端的开口，所述下盖的封合层与所述柱状壳体的封合层连接以密封所述柱状壳体的第二端的开口，所述上盖、所述柱状壳体和所述下盖围合形成密封的外壳；
所述极芯容纳在所述外壳内，所述极芯引出多个正极耳和多个负极耳，多个所述正极耳的外端从所述柱状壳体的第一端穿出，多个所述正极耳的外端连接在一起形成正极耳网络结构，多个所述负极耳的外端从所述柱状壳体的第二端穿出，多个所述负极耳的外端连接在一起形成负极耳网络结构。
在本申请上述软包电池中，多个所述正极耳的外端通过焊接的方式连接在一起，多个所述负极耳的外端通过焊接的方式连接在一起。
在本申请上述软包电池中，所述柱状壳体呈圆柱状结构，所述上盖和所述下盖呈与所述柱状壳体相匹配的圆筒状结构。
在本申请上述软包电池中，所述上盖的开口端朝向所述柱状壳体的外侧，所述上盖的筒周壁与所述柱状壳体的侧壁形成有第一封边；
所述下盖的开口端朝向所述柱状壳体的外侧，所述下盖的筒周壁与所述柱状壳体的侧壁形成有第二封边。
在本申请上述软包电池中，多个所述正极耳的外端从所述上盖的筒周壁与所述柱状壳体的侧壁之间穿出，多个所述负极耳的外端从所述下盖的筒周壁与所述柱状壳体的侧壁之间穿出。
在本申请上述软包电池中，所述第一封边弯折贴合在所述上盖的底壁外表面，所述第二封边弯折贴合在所述下盖的底壁外表面。
在本申请上述软包电池中，所述上盖包括两个以上的第一分盖；两个以上的所述第一分盖拼接成所述上盖，所述上盖的开口端朝向所述柱状壳体的外侧，所述上盖的筒周壁与所述柱状壳体的侧壁形成有第三封边，各所述第一分盖之间的位于所述上盖内的拼接处形成有第四封边；
所述下盖包括两个以上的第二分盖；两个以上的所述第二分盖拼接成所述下盖，所述下盖的开口端朝向所述柱状壳体的外侧，所述下盖的筒周壁与所述柱状壳体的侧壁形成有第五封边，各所述第二分盖之间的位于所述下盖内的拼接处形成有第六封边。
在本申请上述软包电池中，多个所述正极耳的外端从各所述第一分盖之间的位于所述上盖内的拼接处穿出，多个所述负极耳的外端从各所述第二分盖之间的位于所述下盖内的拼接处穿出。
在本申请上述软包电池中，在所有的所述正极耳中：一部分所述正极耳的外端从各所述第一分盖之间的位于所述上盖内的拼接处穿出，其余的所述正极耳的外端从所述上盖的筒周壁与所述柱状壳体的侧壁之间穿出；
在所有的所述负极耳中：一部分所述负极耳的外端从各所述第二分盖之间的位于所述下盖内的拼接处穿出，其余的所述负极耳的外端从所述下盖的筒周壁与所述柱状壳体的侧壁之间穿出。
在本申请上述软包电池中，所述第三封边和所述第四封边弯折贴合在所述上盖的底壁外表面；所述第五封边和所述第六封边弯折贴合在所述下盖的底壁外表面。
在本申请上述软包电池中，所述软包装膜为铝塑复合膜，所述保护层为所述铝塑复合膜的尼龙层，所述封合层为所述铝塑复合膜的PP层，所述中间金属层为所述铝塑复合膜的铝箔层。
在本申请上述软包电池中，所述极芯采用卷芯，或所述极芯采用叠片结构 的电芯。
有益效果
本申请提供的软包电池的有益效果在于，与现有技术相比，通过采用由上盖、下盖和由软包装膜卷成的中空的柱状壳体围合成密封的外壳，使得容纳在外壳内的具有多个正极耳和多个负极耳的极芯可以将多个正极耳从柱状壳体的第一端直接穿出，将多个负极耳从柱状壳体的第二端直接穿出；穿出后的正极耳的外端连接在一起形成正极耳网络结构，穿出后的负极耳的外端连接在一起形成负极耳网络结构，正极耳网络结构和负极耳网络结构极大地降低了软包电池的电池阻抗，不会出现过流导热的现象，实现大倍率充放电特性，同时具有一定强度的极耳结构可以等同替代钢壳，直接与用电元件接触使用。并且由于不用对柱状壳体进行冲坑，使得封装的主体不会产生拔模角度，提高了空间利用率，极大地提升了能量密度，并且柱状壳体也不会受到冲坑深度的限制，可以使用更薄的软包装膜，打破了冲深坑技术的制约，能成型为任意尺寸的软包电池外壳。
附图说明
图1是本申请一实施例提供的软包电池的外壳未去气袋时的结构示意图；
图2是本申请一实施例提供的软包电池的外壳的爆炸图；
图3是本申请一实施例提供的软包装膜的剖视图；
图4是本申请一实施例提供的具有正极耳网络结构的软包电池的结构示意图；
图5是将图4的第一封边弯折贴合在上盖的底壁外表面时的结构示意图；
图6是具有两个第一分盖的上盖的结构示意图；
图7是具有两个第二分盖的下盖的结构示意图；
图8是具有图6所示的上盖的软包电池的外壳未去气袋时的结构示意图；
图9是具有图6所示的上盖时，多个正极耳的外端从柱状壳体的第一端穿出时的结构示意图；
图10是采用图6所示的上盖并具有正极耳网络结构的软包电池的结构示意图；
图11是具有四个第一分盖的上盖的结构示意图；
图12是具有图11所示的上盖时，软包电池的外壳未去气袋时的结构示意图；
图13是采用图11所示的上盖并具有正极耳网络结构的软包电池的结构示意图。
说明书中的附图标记如下：
11、正极耳；；12、负极耳；
21、保护层；22、封合层；23、中间金属层；
3、柱状壳体；
4、上盖；41、第一分盖；
5、下盖；51、第二分盖；
6、第一封边；7、第三封边；8、第四封边；9、第六封边；10、气袋。
具体实施方式
为了使本申请所解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步的详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者间接在该另一个元件上。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或间接连接至该另一个元件上。
需要理解的是，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。
如图1-4、图9-10、图12-13所示，本申请实施例提供的软包电池，包括极芯、由软包装膜冲压成的上盖4、由软包装膜冲压成的下盖5以及由软包装膜卷成的中空的柱状壳体3；软包装膜包括保护层21、封合层22和设置在保护层21和封合层22之间的中间金属层23；
柱状壳体3的壳壁内表面为封合层22，上盖4和下盖5呈筒状结构，上盖4的筒周壁外表面和下盖5的筒周壁外表面为封合层22；
上盖4的封合层与柱状壳体3的封合层连接以密封柱状壳体3的第一端的开口，下盖5的封合层与柱状壳体3的封合层连接以密封柱状壳体3的第二端的开口，上盖4、柱状壳体3和下盖5围合形成密封的外壳；
极芯容纳在外壳内，极芯引出多个正极耳11和多个负极耳12，多个正极耳11的外端从柱状壳体3的第一端穿出，多个正极耳11的外端连接在一起形成正极耳网络结构，多个负极耳12的外端从柱状壳体3的第二端穿出，多个负极耳12的外端连接在一起形成负极耳网络结构。其中，正极耳11和负极耳12没有特别限制，可根据实际需求选择，如可以采用金、铂、铝、铜等材质的金属带或金属片；极芯没有特别限制，如可以采用本领域常用的卷芯或者叠片结构的电芯。
本申请实施例提供的软包电池，与现有技术相比，通过采用由上盖4、下盖5和由软包装膜卷成的中空的柱状壳体3围合成密封的外壳，使得容纳在外壳内的具有多个正极耳11和多个负极耳12的极芯可以将多个正极耳11从柱状壳体3的第一端直接穿出，将多个负极耳12从柱状壳体3的第二端直接穿出；穿出 后的正极耳11的外端连接在一起形成正极耳网络结构，穿出后的负极耳12的外端连接在一起形成负极耳网络结构，正极耳网络结构和负极耳网络结构极大地降低了软包电池的电池阻抗，不会出现过流导热的现象，实现大倍率充放电特性，同时具有一定强度的极耳结构可以等同替代钢壳，直接与用电元件接触使用。并且由于不用对柱状壳体3进行冲坑，使得封装的主体不会产生拔模角度，提高了空间利用率，极大地提升了能量密度，并且柱状壳体3也不会受到冲坑深度的限制，可以使用更薄的软包装膜，打破了冲深坑技术的制约，能成型为任意尺寸的软包电池外壳。
较优地，多个正极耳11的外端通过焊接的方式连接在一起，多个负极耳12的外端通过焊接的方式连接在一起。例如可以通过锡焊形成极耳网络结构，通过焊接的方式形成的具有一定强度的极耳结构(正极耳网络结构和负极耳网络结构)可以等同替代钢壳，直接与用电元件接触使用。
在一实施例中，柱状壳体3呈圆柱状结构，上盖4和下盖5呈与柱状壳体3相匹配的圆筒状结构。采用圆柱状的结构可以提高软包电池的能量密度。
其中，柱状壳体3、上盖4和下盖5可以通过如下步骤获取：
制作柱状壳体3时：将软包装膜卷成圆柱状壳体3，使软包装膜的周向上的一端的封合层22与其周向上的另一端的封合层22对接；将软包装膜的周向一端的封合层22与其周向上的另一端的封合层22的对接处进行热封。其中，可以采用热封机对圆柱状壳体3的对接处进行热封。如图1所示，在圆柱状壳体3的对接处形成有气袋10，在软包电池化成后，进行二次封装再将气袋10切除。形成的多余折边可以弯折贴合在柱状壳体的外周壁上。此种结构的柱状壳体3由于不用对其进行冲坑，使得柱状壳体3不会产生拔模角度，提高了空间利用率，极大地提升了能量密度，并且柱状壳体3也不会受到冲坑深度的限制，可以使用更薄的软包装膜，打破了冲深坑技术的制约，能成型为任意尺寸的软包电池外壳。
制作上盖4时：从软包装膜的保护层21一侧朝软包装膜的封合层22一侧 冲压，使得冲压成的上盖4的筒周壁外表面为封合层22，上盖4的筒周壁内表面为保护层21；
制作下盖5时：从软包装膜的保护层21一侧朝软包装膜的封合层22一侧冲压，使得冲压成的下盖5的筒周壁外表面为封合层22，下盖5的筒周壁内表面为保护层21。
在一实施例中，如图4所示，上盖4的开口端朝向柱状壳体3的外侧，上盖4的筒周壁与柱状壳体3的侧壁形成有第一封边6；具体地，可以通过热封机对第一封边6进行热封从而将上盖4密封盖设在柱状壳体3的第一端的开口处。通过将上盖4的开口端朝向柱状壳体3外侧可以方便对第一封边6进行热封。
下盖5的开口端朝向柱状壳体3的外侧，下盖5的筒周壁与柱状壳体3的侧壁形成有第二封边；具体地，可以通过热封机对第二封边进行热封从而将下盖5密封盖设在柱状壳体3的第二端的开口处，通过将下盖5的开口端朝向柱状壳体3外侧可以方便对第二封边进行热封。
在一实施例中，如图4所示，多个正极耳11的外端从上盖4的筒周壁与柱状壳体3的侧壁之间穿出，多个负极耳12的外端从下盖5的筒周壁与柱状壳体3的侧壁之间穿出。以方便后续多个正极耳11形成正极耳网络结构，多个负极耳12形成负极耳网络结构。其中，当正极耳11从柱状壳体3的第一端的开口处穿出时，先不将上盖4的筒周壁与柱状壳体3的侧壁热封成第一封边6，待将正极耳11从上盖4的筒周壁与柱状壳体3的侧壁之间穿出后再进行热封。当负极耳12从柱状壳体3的第二端的开口处穿出时，先不将下盖5的筒周壁与柱状壳体3的侧壁热封成第二封边，待将负极耳12从下盖5的筒周壁与柱状壳体3的侧壁之间穿出后再进行热封。
在一实施例中，如图5所示，为了加大空间利用率，提高软包电池的能量密度，将第一封边6弯折贴合在上盖4的底壁外表面；将第二封边弯折贴合在下盖5的底壁外表面，并可以对第一封边6和第二封边进行压纹工序。
在一实施例中，如图6-13所示，上盖4包括两个以上的第一分盖41；两个 以上的第一分盖41拼接成上盖4，上盖4的开口端朝向柱状壳体3的外侧，上盖4的筒周壁与柱状壳体3的侧壁形成有第三封边7，各第一分盖41之间的位于上盖4内的拼接处形成有第四封边8；其中，第三封边7和第四封边8可以通过热封机进行热封，通过将上盖4的开口端朝向柱状壳体3外侧可以方便对第三封边7和第四封边8进行热封。
下盖5包括两个以上的第二分盖51；两个以上的第二分盖51拼接成下盖5，下盖5的开口端朝向柱状壳体3的外侧，下盖5的筒周壁与柱状壳体3的侧壁形成有第五封边(未示出)，各第二分盖51之间的位于下盖5内的拼接处形成有第六封边9；其中，第五封边和第六封边9可以通过热封机进行热封，通过将下盖5的开口端朝向柱状壳体3外侧可以方便对第五封边和第六封边9进行热封。
在一实施例中，多个正极耳11的外端从各第一分盖41之间的位于上盖4内的拼接处穿出，多个负极耳12的外端从各第二分盖51之间的位于下盖5内的拼接处穿出。以方便后续多个正极耳11形成正极耳网络结构，多个负极耳12形成负极耳网络结构。
当然，如图13所示，多个正极耳11的外端也可以从上盖4的筒周壁与柱状壳体3的侧壁之间穿出，多个负极耳12的外端也可以从下盖5的筒周壁与柱状壳体3的侧壁之间穿出。
在一实施例中，如图9-10所示，在所有的正极耳11中：一部分正极耳11的外端从各第一分盖41之间的位于上盖4内的拼接处穿出，其余的正极耳11的外端从上盖4的筒周壁与柱状壳体3的侧壁之间穿出；以方便后续多个正极耳11形成正极耳网络结构。
在所有的负极耳中：一部分负极耳12的外端从各第二分盖51之间的位于下盖5内的拼接处穿出，其余的负极耳12的外端从下盖5的筒周壁与柱状壳体3的侧壁之间穿出，以方便后续多个负极耳12形成负极耳网络结构。
在一实施例中，为了加大空间利用率，提高软包电池的能量密度，将第三 封边7和第四封边8弯折贴合在上盖4的底壁外表面；将第五封边和第六封边9弯折贴合在下盖5的底壁外表面。
在一实施例中，软包装膜为铝塑复合膜，保护层21为铝塑复合膜的尼龙层，封合层22为铝塑复合膜的PP层，中间金属层23为铝塑复合膜的铝箔层，铝塑复合膜的抗压性能、热封性能和密封性能好，能有效防止软包纽扣电池中的电池漏液，延长软包电池的使用寿命。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种软包电池，其中，包括极芯、由软包装膜冲压成的上盖、由软包装膜冲压成的下盖以及由软包装膜卷成的中空的柱状壳体；所述软包装膜包括保护层、封合层和设置在所述保护层和所述封合层之间的中间金属层；
    所述柱状壳体的壳壁内表面为封合层，所述上盖和所述下盖呈筒状结构，所述上盖的筒周壁外表面和所述下盖的筒周壁外表面为封合层；
    所述上盖的封合层与所述柱状壳体的封合层连接以密封所述柱状壳体的第一端的开口，所述下盖的封合层与所述柱状壳体的封合层连接以密封所述柱状壳体的第二端的开口，所述上盖、所述柱状壳体和所述下盖围合形成密封的外壳；
    所述极芯容纳在所述外壳内，所述极芯引出多个正极耳和多个负极耳，多个所述正极耳的外端从所述柱状壳体的第一端穿出，多个所述正极耳的外端连接在一起形成正极耳网络结构，多个所述负极耳的外端从所述柱状壳体的第二端穿出，多个所述负极耳的外端连接在一起形成负极耳网络结构。
  2. 根据权利要求1所述的软包电池，其中，多个所述正极耳的外端通过焊接的方式连接在一起，多个所述负极耳的外端通过焊接的方式连接在一起。
  3. 根据权利要求1所述的软包电池，其中，所述柱状壳体呈圆柱状结构，所述上盖和所述下盖呈与所述柱状壳体相匹配的圆筒状结构。
  4. 根据权利要求1所述的软包电池，其中，所述上盖的开口端朝向所述柱状壳体的外侧，所述上盖的筒周壁与所述柱状壳体的侧壁形成有第一封边；
    所述下盖的开口端朝向所述柱状壳体的外侧，所述下盖的筒周壁与所述柱状壳体的侧壁形成有第二封边。
  5. 根据权利要求4所述的软包电池，其中，多个所述正极耳的外端从所述上盖的筒周壁与所述柱状壳体的侧壁之间穿出，多个所述负极耳的外端从所述下盖的筒周壁与所述柱状壳体的侧壁之间穿出。
  6. 根据权利要求4所述的软包电池，其中，所述第一封边弯折贴合在所述上盖的底壁外表面，所述第二封边弯折贴合在所述下盖的底壁外表面。
  7. 根据权利要求1所述的软包电池，其中，所述上盖包括两个以上的第一分盖；两个以上的所述第一分盖拼接成所述上盖，所述上盖的开口端朝向所述柱状壳体的外侧，所述上盖的筒周壁与所述柱状壳体的侧壁形成有第三封边，各所述第一分盖之间的位于所述上盖内的拼接处形成有第四封边；
    所述下盖包括两个以上的第二分盖；两个以上的所述第二分盖拼接成所述下盖，所述下盖的开口端朝向所述柱状壳体的外侧，所述下盖的筒周壁与所述柱状壳体的侧壁形成有第五封边，各所述第二分盖之间的位于所述下盖内的拼接处形成有第六封边。
  8. 根据权利要求7所述的软包电池，其中，多个所述正极耳的外端从各所述第一分盖之间的位于所述上盖内的拼接处穿出，多个所述负极耳的外端从各所述第二分盖之间的位于所述下盖内的拼接处穿出。
  9. 根据权利要求7所述的软包电池，其中，在所有的所述正极耳中：一部分所述正极耳的外端从各所述第一分盖之间的位于所述上盖内的拼接处穿出，其余的所述正极耳的外端从所述上盖的筒周壁与所述柱状壳体的侧壁之间穿出；
    在所有的所述负极耳中：一部分所述负极耳的外端从各所述第二分盖之间的位于所述下盖内的拼接处穿出，其余的所述负极耳的外端从所述下盖的筒周壁与所述柱状壳体的侧壁之间穿出。
  10. 根据权利要求7所述的软包电池，其中，所述第三封边和所述第四封边弯折贴合在所述上盖的底壁外表面；所述第五封边和所述第六封边弯折贴合在所述下盖的底壁外表面。
  11. 根据权利要求1所述的软包电池，其中，所述软包装膜为铝塑复合膜，所述保护层为所述铝塑复合膜的尼龙层，所述封合层为所述铝塑复合膜的PP层，所述中间金属层为所述铝塑复合膜的铝箔层。
  12. 根据权利要求1所述的软包电池，其中，所述极芯采用卷芯，或所述极芯采用叠片结构的电芯。
PCT/CN2021/094428 2020-11-18 2021-05-18 软包电池 WO2022105158A1 (zh)

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CN202145472U (zh) * 2011-07-14 2012-02-15 杭州万好万家动力电池有限公司 一种锂离子电池用多极柱电池盖帽
CN204407383U (zh) * 2014-12-23 2015-06-17 山东精工电子科技有限公司 一种软包装电池组装置
CN109671877A (zh) * 2018-12-06 2019-04-23 新余赣锋电子有限公司 一种含软包电芯的电池
KR20190048607A (ko) * 2017-10-31 2019-05-09 주식회사 엘지화학 낮은 저항의 원통형 전지셀
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CN202145472U (zh) * 2011-07-14 2012-02-15 杭州万好万家动力电池有限公司 一种锂离子电池用多极柱电池盖帽
CN204407383U (zh) * 2014-12-23 2015-06-17 山东精工电子科技有限公司 一种软包装电池组装置
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