WO2022042493A1 - 电芯、电池以及电池包 - Google Patents

电芯、电池以及电池包 Download PDF

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Publication number
WO2022042493A1
WO2022042493A1 PCT/CN2021/114102 CN2021114102W WO2022042493A1 WO 2022042493 A1 WO2022042493 A1 WO 2022042493A1 CN 2021114102 W CN2021114102 W CN 2021114102W WO 2022042493 A1 WO2022042493 A1 WO 2022042493A1
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Prior art keywords
tab
area
exposed
tabs
battery
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PCT/CN2021/114102
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English (en)
French (fr)
Inventor
王信月
段平安
程晗
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比亚迪股份有限公司
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Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to JP2023513945A priority Critical patent/JP2023539658A/ja
Priority to CA3191039A priority patent/CA3191039A1/en
Priority to KR1020237008544A priority patent/KR20230051239A/ko
Publication of WO2022042493A1 publication Critical patent/WO2022042493A1/zh
Priority to US18/176,179 priority patent/US20230231287A1/en

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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
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • 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
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • 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

Definitions

  • the present application relates to the field of batteries, and in particular, to a battery cell, a battery and a battery pack.
  • the plurality of tabs of the pole core are welded together after being merged, and the plurality of tabs are exposed on the part of the pole core to form an exposed area of the tabs. If the length of the exposed area of the tabs is designed to be too long, the movable length of the tabs will increase. , a larger bending space is needed to accommodate the tabs. Designing a larger bending space will cause a loss of cell capacity. If the bending space is not increased, the tabs will be squeezed, which will easily cause positive and negative contact, and the electrical The core is a safety risk.
  • the tab will be easily pulled after being bent, resulting in tearing of the tab, and tearing of the tab will prevent some of the pole pieces from being electrically extracted, resulting in a loss of cell capacity.
  • the present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery cell, which can prevent the tab from being pulled after being bent, avoid the loss of cell capacity, and prevent the tab from being squeezed, thereby improving the safety of the battery. .
  • the present application further proposes a battery.
  • the present application further proposes a battery pack.
  • the battery core according to the present application includes: at least one pole core, each of the pole cores has a plurality of tabs, and after the plurality of the tabs are merged, a tab end staggered layer area, a tab welding area, and a pre-soldering area are formed in sequence.
  • a pressing area the parts of the plurality of tabs exposed to the pole core form a tab exposed area, and the length of the exposed tabs exposed to the pole core inside and outside the tab exposed area is based on the tab end
  • the width of the staggered layer area, the width of the tab welding area, the width of the pre-welding pressing area, the thickness of the pole core, and the tab bending angle of the tab are determined.
  • the length of the exposed tabs exposed to the pole core inside and outside the tab exposed area can be made more suitable, the tabs can be prevented from being pulled after being bent, and tearing can be prevented, so that the capacity loss of the battery cell can be avoided,
  • the movable length of the tabs can also be made suitable, and the bending space can be made suitable, so as to avoid the loss of the capacity of the battery cells, and also to prevent the tabs from being squeezed, thereby improving the use safety of the cells.
  • the width of the tab end staggered area is d 1
  • the tab welding area is provided with a tab protection sheet
  • the width of the tab protection sheet is d 2
  • the The width of the pre-welded pressing area is d 3
  • the thickness of the pole core is D
  • the bending angle of the tab of any one of the plurality of tabs is A
  • A satisfies the relation: 45° ⁇ A ⁇ 135°.
  • the ratio of d 2 to d 1 is B, which satisfies the relationship: 4 ⁇ B ⁇ 10.
  • the ratio of d 2 to d 3 is C, which satisfies the relationship: 4 ⁇ C ⁇ 24.
  • the relationship: 0mm ⁇ d 1 ⁇ 8mm is satisfied.
  • the relation: 8mm ⁇ d 2 ⁇ 12mm is satisfied.
  • the relation: 0.5mm ⁇ d 3 ⁇ 2mm is satisfied.
  • the battery according to the present application includes the above-mentioned battery cell.
  • a battery pack according to the present application includes the above-mentioned battery.
  • FIG. 1 is a schematic diagram of a battery according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a battery cell according to an embodiment of the present application when the tabs of the pole cores meet and are not folded;
  • FIG. 3 is an unfolded after the tabs of the pole cores of another type of the battery core meet and are not folded according to an embodiment of the present application. Schematic diagram of bending.
  • the battery cell 10 according to the embodiment of the present application is described below with reference to FIGS. 1-3 .
  • a battery cell 10 includes: at least one pole core 20 , each pole core 20 has a plurality of tabs 201 , and the plurality of tabs 201 are merged to form tab ends in sequence
  • the staggered layer area 203 at the end of the tab refers to the bending of each tab 201 after the confluence of the plurality of tabs 201 .
  • the radians of the tabs are inconsistent, and the free ends of the plurality of tabs 201 together form a staggered region 203 at the tip of the tabs.
  • the pre-welding pressing area 205 refers to that after the plurality of tabs 201 are joined, ultrasonic welding or other welding methods are used to press the joined plurality of tabs 201 together. This area is called the pre-welding pressing area 205 .
  • the tab welding area 204 refers to the area formed by welding the tab 201 and the tab lead-out piece together by laser welding or other welding methods in the pre-welding pressing area 205.
  • the parts of the plurality of tabs 201 exposed to the pole core 20 form a tab exposed area 206. In the extension direction of the tabs 201, that is, the left-right direction in FIG.
  • the length of the tab is determined according to the width of the staggered area 203 at the end of the tab, the width of the tab welding area 204 , the width of the pre-welded pressing area 205 , the thickness of the pole core 20 , and the tab bending angle of the tab 201 .
  • the width direction of the tab end staggered area 203 , the width direction of the tab welding area 204 , and the width direction of the pre-soldering pressing area 205 are the left and right directions in FIG. 2 .
  • the thickness direction of the pole core 20 is the up-down direction in FIG. 2 .
  • the exposed tabs extend in the left-right direction in FIG. 2 .
  • Each pole core 20 has a plurality of diaphragms 202 , and the parts of the plurality of tabs 201 exposed to the diaphragms 202 form a tab exposed area 206 .
  • the tab of the tab 201 By making the length of the tab exposed area 206 according to the width of the tab end staggered area 203 , the width of the tab welding area 204 , the width of the pre-welded pressing area 205 , the thickness of the pole core 20 , the tab of the tab 201
  • the determination of the bending angle can make the length of the exposed tabs exposed to the pole core 20 inside and outside the tab exposed area 206 more suitable, can prevent the tab 201 from being pulled after being bent, can prevent the tab 201 from tearing, and thus can avoid partial
  • the pole pieces cannot be electrically drawn out, so that the capacity loss of the battery cell 10 can be avoided.
  • the movable length of the tab 201 can also be made suitable, and the bending space for accommodating the tab 201 can be made suitable, so as to avoid the capacity loss of the battery cell 10 and prevent the tab 201 from being squeezed, thereby preventing the battery cell from being squeezed.
  • the positive and negative electrodes of 10 are in contact to prevent short circuit of the battery cell 10 , thereby improving the safety of the battery cell 10 in use.
  • the width of the tab end staggered area 203 is d 1
  • the tab welding area 204 is provided with a tab protection sheet 207
  • the width of the tab protection sheet 207 is d 2
  • the width direction of the tab protection sheet 207 is the left-right direction in FIG.
  • the width of the pre-soldered pressing area 205 is d 3
  • the thickness of the pole core 20 is D
  • the bending angle of the tabs of 201 is A
  • the length of the exposed tabs exposed to the pole core 20 in the exposed ear area 206 is more suitable, which can further prevent the tabs 201 from being pulled after being bent, and further prevent the tabs 201 from being torn, thereby further preventing some pole pieces from being unable to be electrically drawn out.
  • the capacity loss of the battery cell 10 can be further avoided.
  • it can also ensure that the movable length of the tab 201 is more suitable, which can make the bending space for accommodating the tab 201 more suitable, thereby further avoiding the capacity loss of the battery cell 10, and further preventing the tab 201 from being squeezed, thereby The contact between the positive and negative electrodes of the battery cell 10 can be further prevented, and the short circuit of the battery cell 10 can be better prevented, thereby further improving the use safety of the battery 100 .
  • A satisfies the relationship: 45° ⁇ A ⁇ 135°, preferably, 60° ⁇ A ⁇ 120°, such setting can make the bending angle of the tab 201 more suitable, and the tab can be exposed
  • the length dimension of the exposed electrode lugs exposed to the electrode core 20 inside and outside the region 206 is reasonable, and it can also prevent the diaphragm 202 from being squeezed, so as to prevent further preventing the positive and negative electrodes of the battery core 10 from contacting, thereby better preventing the short circuit of the battery core 10. .
  • the ratio of d 2 to d 1 is B, which satisfies the relation: 4 ⁇ B ⁇ 10, and further, the ratio of d 2 to d 3 is C, which satisfies the relation: 4 ⁇ C ⁇ twenty four.
  • This arrangement can make the ratio of d 2 to d 1 and d 2 to d 3 appropriate, which is beneficial to the production and manufacture of the pole core 20 , and can also make the welding width of the tab welding area 204 suitable, which can ensure that multiple poles The ears 201 are reliably welded together, so that the reliability of the battery cell 10 during use can be improved.
  • the relationship is satisfied: 0 mm ⁇ d 1 ⁇ 8 mm, preferably, d 1 is 4 mm, such setting can make the width of the tab end staggered region 203 appropriate, and can avoid the tab end
  • the width of the split layer region 203 is too wide, so that the length of the tab exposed region 206 can be more suitable.
  • the relationship is satisfied: 8mm ⁇ d 2 ⁇ 12mm, preferably, d 2 is 10mm, such setting can make the width of the tab protection sheet 207 suitable, and can ensure the welding of the tab welding area 204 Therefore, the length of the tab exposed region 206 can be made suitable, which is more favorable for the production and manufacture of the pole core 20 .
  • the relationship is satisfied: 0.5mm ⁇ d 3 ⁇ 2mm, preferably, d 3 is 1.5mm, when welding a plurality of tabs 201, by setting d 3 to 1.5mm, it can make
  • the width of the pre-soldering pressing area 205 is suitable, so that the pre-soldering pressing block can press the plurality of tabs 201 , so as to ensure the welding quality of the plurality of tabs 201 , thereby ensuring the production quality of the battery cell 10 .
  • the battery 100 includes the battery cell 10 of the above-mentioned embodiments.
  • the battery cell 10 is disposed on the battery 100, so that the length of the exposed tabs exposed to the electrode core 20 inside and outside the tab exposed area 206 is more suitable, and can
  • the tab 201 is prevented from being pulled after being bent, which can prevent tearing, thereby avoiding the capacity loss of the battery cell 10, thereby avoiding the capacity loss of the battery 100, and the movable length of the tab 201 can also be suitable, which can make the bending space It is suitable, so that the capacity loss of the battery cell 10 can be avoided, and the tab 201 can be prevented from being squeezed, so that the use safety of the battery cell 10 can be improved, and the use safety of the battery cell 100 can be improved.
  • the battery 100 package includes the battery 100 of the above-mentioned embodiments.
  • the battery 100 is arranged in the battery 100 package, which can avoid the capacity loss of the battery 100 package, and can also improve the use safety of the battery 100 package.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请公开了一种电芯（10）、电池（100）以及电池包，所述电芯（10）包括：至少一个极芯（20），每个极芯（20）具有多个极耳（201），多个极耳（201）汇合后依次形成极耳端部错层区（203）、极耳焊接区（204）、预焊压合区（205），多个极耳（201）的外露于极芯（20）的部分形成极耳外露区（206），极耳外露区（206）内外露于极芯（20）的外露极耳（201）的长度根据极耳端部错层区（203）的宽度、极耳焊接区（204）的宽度、预焊压合区（205）的宽度、极芯（20）的厚度、极耳（201）的极耳折弯角确定。

Description

电芯、电池以及电池包
相关申请的交叉引用
本申请要求比亚迪股份有限公司于2020年8月31日提交的、发明名称为“电芯、电池以及电池包”的、中国专利申请号“202010898785.4”的优先权。
技术领域
本申请涉及电池领域，尤其是涉及一种电芯、电池以及电池包。
背景技术
相关技术中，极芯的多个极耳汇合后焊接在一起，多个极耳外露于极芯部分形成极耳外露区，如果极耳外露区设计长度过长，会使极耳可活动长度增加，需要更大的折弯空间容纳极耳，设计更大的折弯空间会造成电芯容量损失，若不增大折弯空间，则极耳会被挤压，容易造成正负极接触，电芯具有安全风险。
如果极耳外露区设计长度过小，极耳折弯后易被拉扯，导致极耳撕裂，极耳撕裂会导致部分极片无法进行电引出，造成电芯容量损失。
发明内容
本申请旨在至少解决现有技术中存在的技术问题之一。为此，本申请提出了一种电芯，该电芯可以避免极耳折弯后被拉扯，可以避免造成电芯容量损失，还可以防止极耳被挤压，从而可以提升电池的使用安全性。
本申请进一步地提出了一种电池。
本申请进一步地提出了一种电池包。
根据本申请的电芯包括：至少一个极芯，每个所述极芯具有多个极耳，多个所述极耳汇合后依次形成极耳端部错层区、极耳焊接区、预焊压合区，多个所述极耳的外露于所述极芯的部分形成极耳外露区，所述极耳外露区内外露于所述极芯的外露极耳的长度根据所述极耳端部错层区的宽度、所述极耳焊接区的宽度、所述预焊压合区的宽度、所述极芯的厚度、所述极耳的极耳折弯角确定。
根据本申请的电芯，能够使极耳外露区内外露于极芯的外露极耳的长度更加适宜，能够避免极耳折弯后被拉扯，可以防止撕裂，从而可以避免电芯容量损失，并且，也能够使极耳可活动长度适宜，可以使折弯空间适宜，从而可以避免造成电芯容量损失，也可以防止极耳被挤压，从而可以提升电芯的使用安全性。
根据本申请的一些实施例，所述极耳端部错层区的宽度为d 1，所述极耳焊接区设有极耳保护片，所述极耳保护片的宽度为d 2，所述预焊压合区的宽度为d 3，所述极芯的厚度为D，多个所述极耳中的任意一个所述极耳的极耳折弯角为A，所述极耳外露区内所述外露极耳的长度为L，满足关系式：L＝d 1+d 2+d 3+D/2*tanA。
根据本申请的一些实施例，A满足关系式：45°≤A≤135°。
根据本申请的一些实施例，d 2与d 1的比值为B，满足关系式：4<B<10。
根据本申请的一些实施例，d 2与d 3的比值为C，满足关系式：4<C<24。
根据本申请的一些实施例，满足关系式：0mm<d 1<8mm。
根据本申请的一些实施例，满足关系式：8mm≤d 2≤12mm。
根据本申请的一些实施例，满足关系式：0.5mm≤d 3≤2mm。
根据本申请的电池，包括上述的电芯。
根据本申请的电池包，包括上述的电池。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
图1是根据本申请实施例的电池的示意图；
图2是根据本申请实施例的电芯的极芯的极耳汇合后未折弯时示意图；图3是根据本申请实施例的电芯的另一种的极芯的极耳汇合后未折弯时示意图。
具体实施方式
下面详细描述本申请的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本申请，而不能理解为对本申请的限制。
下面参考图1-图3描述根据本申请实施例的电芯10。
如图1-图3所示，根据本申请实施例的电芯10包括：至少一个极芯20，每个极芯20具有多个极耳201，多个极耳201汇合后依次形成极耳端部错层区203、极耳焊接区204、预焊压合区205，需要说明的是，极耳端部错层区203是指多个极耳201汇合后由于每个极耳201汇合时弯曲的弧度不一致，多个极耳201的自由端共同形成为极耳端部错层区203。预焊压合区205是指多个极耳201汇合后，在汇合处用超声波焊接或者其他焊接方式将汇合的多个极耳201压合在一起，此区域称为预焊压合区205。极耳焊 接区204是指在预焊压合区205内，将极耳201与极耳引出片通过激光焊接或者其他焊接方式焊接在一起形成的区域。多个极耳201的外露于极芯20的部分形成极耳外露区206，在极耳201的延伸方向，即图2中的左右方向，极耳外露区206内外露于极芯10的外露极耳的长度根据极耳端部错层区203的宽度、极耳焊接区204的宽度、预焊压合区205的宽度、极芯20的厚度、极耳201的极耳折弯角确定。
根据本申请的一些实施例，极耳端部错层区203的宽度方向、极耳焊接区204的宽度方向、预焊压合区205的宽度方向均为图2中的左右方向，极芯20的厚度方向为图2中的上下方向，极芯20的极耳201汇合后未折弯时，外露极耳的在图2中的左右方向延伸。每个极芯20具有多个隔膜202，多个极耳201的外露于隔膜202的部分形成极耳外露区206。
通过使极耳外露区206的长度根据极耳端部错层区203的宽度、极耳焊接区204的宽度、预焊压合区205的宽度、极芯20的厚度、极耳201的极耳折弯角确定，能够使极耳外露区206内外露于极芯20的外露极耳的长度更加适宜，能够避免极耳201折弯后被拉扯，可以防止极耳201撕裂，从而可以避免部分极片无法进行电引出，进而可以避免电芯10容量损失。并且，也能够使极耳201可活动长度适宜，可以使容纳极耳201的折弯空间适宜，从而可以避免造成电芯10容量损失，也可以防止极耳201被挤压，从而可以防止电芯10的正负极接触，防止造成电芯10短路，进而可以提升电芯10的使用安全性。
在本申请的一些实施例中，如图2所示，极耳端部错层区203的宽度为d 1，极耳焊接区204设有极耳保护片207，极耳保护片207的宽度为d 2，极耳保护片207的宽度方向为图2中的左右方向，预焊压合区205的宽度为d 3，极芯20的厚度为D，多个极耳201中的任意一个极耳201的极耳折弯角为A，极耳外露区206内外露极耳的长度为L，满足关系式：L＝d 1+d 2+d 3+D/2*tanA，如此设置能够保证极耳外露区206内外露于极芯20的外露极耳的长度更加适宜，可以进一步避免极耳201折弯后被拉扯，进一步防止极耳201撕裂，从而可以进一步避免部分极片无法进行电引出，进而可以进一步避免电芯10容量损失。并且，也能够保证极耳201可活动长度更加适宜，可以使容纳极耳201的折弯空间更加适宜，从而可以进一步避免造成电芯10容量损失，也可以进一步防止极耳201被挤压，从而可以进一步防止电芯10的正负极接触，更好地防止造成电芯10短路，进而可以进一步提升电池100的使用安全性。
根据本申请的一些实施例，A满足关系式：45°≤A≤135°，优选地，60°≤A≤120°，这样设置能够使极耳201折弯角更加适宜，可以使极耳外露区206内外露于极 芯20的外露极耳的长度尺寸合理，也可以防止挤压隔膜202，从而可以防止进一步防止电芯10的正负极接触，进而可以更好地防止造成电芯10短路。
在本申请的一些实施例中，d 2与d 1的比值为B，满足关系式：4<B<10，进一步地，d 2与d 3的比值为C，满足关系式：4<C<24。这样设置能够使d 2与d 1、d 2与d 3的比例关系适宜，利于极芯20的生产和制造，并且，也能够使极耳焊接区204的焊接宽度适宜，可以保证将多个极耳201可靠地焊接在一起，从而可以提升电芯10使用过程中的可靠性。
在本申请的一些实施例中，满足关系式：0mm<d 1<8mm，优选地，d 1为4mm，这样设置能够使极耳端部错层区203的宽度适宜，可以避免极耳端部错层区203的宽度过宽，从而可以使极耳外露区206的长度更加适宜。
在本申请的一些实施例中，满足关系式：8mm≤d 2≤12mm，优选地，d 2为10mm，如此设置能够使极耳保护片207的宽度适宜，可以保证极耳焊接区204的焊接宽度，从而可以使极耳外露区206的长度适宜，更加利于极芯20的生产和制造。
在本申请的一些实施例中，满足关系式：0.5mm≤d 3≤2mm，优选地，d 3为1.5mm，在焊接多个极耳201时，通过将d 3设置为1.5mm，能够使预焊压合区205的宽度适宜，可以使预焊压块压紧多个极耳201，从而可以保证多个极耳201的焊接质量，进而可以保证电芯10的生产质量。
根据本申请实施例的电池100，包括上述实施例的电芯10，电芯10设置在电池100上，能够使极耳外露区206内外露于极芯20的外露极耳的长度更加适宜，能够避免极耳201折弯后被拉扯，可以防止撕裂，从而可以避免电芯10容量损失，进而可以避免电池100容量损失，并且，也能够使极耳201可活动长度适宜，可以使折弯空间适宜，从而可以避免造成电芯10容量损失，也可以防止极耳201被挤压，从而可以提升电芯10的使用安全性，进而可以升电池100的使用安全性。
根据本申请实施例的电池100包，包括上述实施例的电池100，电池100设置在电池100包内，可以避免电池100包容量损失，也可以提升电池100包的使用安全性。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本申请的实施例，本领域的普通技术人员可以理解：在不脱离本申请的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本申请的范围由权利要求及其等同物限定。

Claims (10)

  1. 一种电芯，其特征在于，包括：
    至少一个极芯，每个所述极芯具有多个极耳，多个所述极耳汇合后依次形成极耳端部错层区、极耳焊接区、预焊压合区，多个所述极耳的外露于所述极芯的部分形成极耳外露区，所述极耳外露区内外露于所述极芯的外露极耳的长度根据所述极耳端部错层区的宽度、所述极耳焊接区的宽度、所述预焊压合区的宽度、所述极芯的厚度、所述极耳的极耳折弯角确定。
  2. 根据权利要求1所述的电芯，其特征在于，所述极耳端部错层区的宽度为d 1，所述极耳焊接区设有极耳保护片，所述极耳保护片的宽度为d 2，所述预焊压合区的宽度为d 3，所述极芯的厚度为D，多个所述极耳中的任意一个所述极耳的极耳折弯角为A，所述极耳外露区内所述外露极耳的长度为L，满足关系式：L＝d 1+d 2+d 3+D/2*tanA。
  3. 根据权利要求1或2所述的电芯，其特征在于，A满足关系式：45°≤A≤135°。
  4. 根据权利要求2所述的电芯，其特征在于，d 2与d 1的比值为B，满足关系式：4<B<10。
  5. 根据权利要求2或4所述的电芯，其特征在于，d 2与d 3的比值为C，满足关系式：4<C<24。
  6. 根据权利要求2或4或5所述的电芯，其特征在于，满足关系式：0mm<d 1<8mm。
  7. 根据权利要求2或4-6中任意一项所述的电芯，其特征在于，满足关系式：8mm≤d 2≤12mm。
  8. 根据权利要求2或4-7中任意一项所述的电芯，其特征在于，满足关系式：0.5mm≤d 3≤2mm。
  9. 一种电池，其特征在于，包括权利要求1-8中任一项所述的电芯。
  10. 一种电池包，其特征在于，包括权利要求9所述的电池。
PCT/CN2021/114102 2020-08-31 2021-08-23 电芯、电池以及电池包 WO2022042493A1 (zh)

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