WO2022042492A1 - 电池以及电池包 - Google Patents

电池以及电池包 Download PDF

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Publication number
WO2022042492A1
WO2022042492A1 PCT/CN2021/114101 CN2021114101W WO2022042492A1 WO 2022042492 A1 WO2022042492 A1 WO 2022042492A1 CN 2021114101 W CN2021114101 W CN 2021114101W WO 2022042492 A1 WO2022042492 A1 WO 2022042492A1
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WO
WIPO (PCT)
Prior art keywords
tab
pole core
pole
lead
battery
Prior art date
Application number
PCT/CN2021/114101
Other languages
English (en)
French (fr)
Inventor
王信月
张达
罗文�
Original Assignee
比亚迪股份有限公司
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 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to JP2023513935A priority Critical patent/JP2023538961A/ja
Priority to KR1020237007469A priority patent/KR20230047439A/ko
Publication of WO2022042492A1 publication Critical patent/WO2022042492A1/zh
Priority to US18/176,145 priority patent/US20230216153A1/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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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 and a battery pack having the same.
  • the multiple tabs of the pole core are welded together after being merged, and the position of the welding point affects the length of the free area of the pole tab.
  • the spacing between the midpoints of the points is designed too small, and the tabs are easily pulled after being bent, resulting in tearing of the tabs. The tearing of the tabs will prevent some of the pole pieces from being electrically drawn out, resulting in a loss of cell capacity.
  • the movable length of the tab will increase, and a larger bending space is required to accommodate the tab. Designing a larger bending space will increase the capacity of the cell. If the bending space is not increased, the tabs will be squeezed, which is likely to cause contact between the positive and negative electrodes, and the battery has a safety risk.
  • an object of the present application is to propose a battery, which can avoid the tabs being pulled after being bent, can avoid the loss of cell capacity, and can also prevent the tabs from being squeezed, thereby improving the use of the battery safety.
  • the present application further proposes a battery pack having the above-mentioned battery.
  • the battery according to the present application includes: a battery cell, the battery core has at least one pole core, each of the pole cores has a plurality of tabs, and the plurality of the tabs are welded and formed with the cover plate of the battery after being merged Soldering point, before the pole core is not cored or when the pole core is unfolded and parallel to the cover plate, the distance between the pole core and the solder joint is based on the thickness of the pole core, the The tab bending angle of the tab and the width of the tab protection sheet at the welding point are determined.
  • the distance between the pole core and the solder joint can be more suitable, the tab can be prevented from being pulled after being bent, and tearing can be prevented, so that the capacity loss of the battery can be avoided, and the tab can also be prevented from being pulled.
  • the suitable movable length can make the bending space suitable, so that the capacity loss of the battery can be avoided, and the tabs can be prevented from being squeezed, so that the use safety of the battery can be improved.
  • the distance between the pole core and the solder joint is L 1
  • the thickness of the pole core is D
  • the width of the tab protection sheet is d 1
  • a tab free area is formed between the pole core and the solder joint, and the The length of the free area of the tab is determined according to the lead-out manner of the tab of the pole core.
  • the pole core is configured as a wound pole core, and when the pole core is drawn out of the pole lug through a half pole lug lead-out method, the thickness of the pole core is D, and the pole core has a thickness D.
  • the length of the tab exposed from the pole core is L 2
  • the length of the free area of the tab is L 3 , which satisfies the relationship: 0.25D ⁇ L 3 ⁇ L 2 .
  • the thickness of the pole core is D
  • the pole tab exposes the pole in the extending direction of the pole tab
  • the length of the core is L 2
  • the length of the free region of the tab is L 3 , satisfying the relation: 0.5D ⁇ L 3 ⁇ L 2 .
  • a plurality of the tabs converge to form a confluence and lead-out position of the tabs.
  • the confluence and lead-out positions of the tabs include a zero lead-out position, a neutral lead-out position, and an offset lead-out position. set the lead-out position; the pole-tab confluence lead-out position is located at the zero lead-out position or the offset lead-out position.
  • a plurality of the tabs converge to form a confluence and lead-out position of the tabs.
  • the confluence and lead-out positions of the tabs include a zero lead-out position, a neutral lead-out position, and an offset lead-out position. set the lead-out position; the pole-tab confluence lead-out position is located at the neutral lead-out position.
  • the width of the tab protection sheet is 8-12 mm.
  • the welding point is provided in a welding point area of the tab, the welding point area includes an ultrasonic welding area and a laser welding area, and the laser welding area is located in the ultrasonic welding area.
  • the width of the ultrasonic welding region in the extending direction of the tab is 4-8 mm.
  • a battery pack according to the present application includes the above-mentioned battery.
  • the battery pack according to the present application is provided with the battery of the above-mentioned embodiment, and since the battery pack of the present application is provided with the battery of the above-mentioned embodiment, the battery pack has safety.
  • FIG. 1 is a cross-sectional view of a battery according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram when the pole core of the battery is unfolded and parallel to the cover plate according to an embodiment of the present application;
  • FIG. 3 is a schematic diagram of the pole core of the battery according to the embodiment of the present application being located at the zero-position extraction position;
  • FIG. 4 is a schematic diagram of a pole core of a battery at an offset extraction position according to an embodiment of the present application
  • FIG. 5 is a schematic diagram of the pole core of the battery at the neutral lead-out position according to an embodiment of the present application.
  • the battery 100 according to the embodiment of the present application is described below with reference to FIGS. 1-5 .
  • a battery 100 includes: a battery cell 10 , the battery cell 10 has at least one pole core 20 , each pole core 20 has a plurality of tabs 201 , and a plurality of tabs 201 After merging, it is welded with the cover plate 30 of the battery 100 to form a welding point 40. Before the pole core 20 is not closed or the pole core 20 is parallel to the cover plate 30 after the pole core 20 is unfolded, it can also be understood that the pole core 20 is not closed before the core is connected to the cover.
  • the distance between the pole core 20 and the solder joint 40 depends on the thickness of the pole core 20, the bending angle of the pole tab 201, and the The width of the tab protection sheet at the welding point 40 in the extension direction is determined.
  • each pole core 20 has a plurality of diaphragms 202, and the distance from the end of the diaphragm 202 opposite to the solder joint 40 to the solder joint 40 is based on the thickness of the pole core 20, The bending angle of the tab 201 and the width of the tab protection sheet in the extending direction of the tab 201 are determined.
  • the thickness direction of the pole core 20 refers to the thickness direction of the pole core 20 in FIGS. 3 to 5 .
  • the extension direction of the tab 201 refers to the left-right direction in FIGS. 3-5 .
  • the distance between the pole core 20 and the solder joint 40 determined according to the thickness of the pole core 20, the tab bending angle of the pole tab 201, and the width of the tab protection sheet at the solder joint 40 in the extending direction of the pole tab 201, It can make the distance between the pole core 20 and the solder joint 40 more suitable, can prevent the pole lug 201 from being pulled after bending, can prevent the pole lug 201 from tearing, and thus can prevent some pole pieces from being unable to be electrically drawn out, thereby avoiding electrical Core 10 capacity loss.
  • 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 the battery 10 are in contact to prevent short circuit of the battery cell 10 , thereby improving the safety of the battery 100 .
  • the distance between the pole core 20 and the solder joint 40 is L 1 , the thickness of the pole core 20 is D, the width of the tab protection sheet is d 1 , and the tabs of the tabs 201 are bent
  • the distance between the opposite ends of the solder joints 40 and the solder joints 40 is L 1 . This setting can further prevent the tabs 201 from being pulled after being bent, and can further prevent the tabs 201 from tearing, thereby further preventing the failure of some pole pieces.
  • Conducting electrical extraction can further avoid the capacity loss of the battery cell 10 .
  • the movable length of the tabs 201 can be made more suitable, and the bending space for accommodating the tabs 201 can be made more suitable, thereby further avoiding the capacity loss of the battery cell 10, and further preventing the tabs 201 from being squeezed.
  • the contact between the positive and negative electrodes of the battery cells 10 can be further prevented, and the short circuit of the battery cells 10 can be better prevented, thereby further improving the use safety of the battery 100 .
  • the width of the tab protection sheet can be set to 8-12 mm, which can make the width of the tab protection sheet suitable, can better protect the tab 201, and can further avoid the polar
  • the ears 201 are pulled after being bent, which can further prevent the tabs 201 from being torn, thereby further preventing some of the pole pieces from being unable to be electrically drawn out, thereby further avoiding the capacity loss of the battery cell 10 .
  • the movable length of the tabs 201 can be made more suitable, and the bending space for accommodating the tabs 201 can be made more suitable, thereby further avoiding the capacity loss of the battery cell 10, and further preventing the tabs 201 from being squeezed.
  • the contact between the positive and negative electrodes of the battery cells 10 can be further prevented, and the short circuit of the battery cells 10 can be better prevented, thereby further improving the use safety of the battery 100 .
  • pole core 20 when the pole core 20 is parallel to the cover plate 30 before the pole core 20 is unwound or after the pole core 20 is unfolded, it can also be understood that when the pole core 20 is parallel to the cover plate 30 before the pole core 20 is unwound, or the pole core 20 is parallel to the cover plate 30 before the pole core 20 is unwound When the core 20 is unfolded and parallel to the cover plate 30 , as shown in FIG. 2 , a free area of the tab is formed between the pole core 20 and the solder joint 40 in the extending direction of the tab 201 .
  • a tab free area is formed between the end of the diaphragm 202 opposite to the solder joint 40 and the solder joint 40 , and the length of the tab free area depends on the pole core 20
  • the lead-out method of the tabs 201 is determined, and this setting can make the length of the free area of the tabs more suitable, which can further prevent the tabs 201 from being pulled after being bent, and can further prevent some of the pole pieces from being unable to be electrically led out, thereby further avoiding the battery core. 10 Loss of capacity.
  • the movable length of the tabs 201 can be made more suitable, and the bending space for accommodating the tabs 201 can be made more suitable, thereby further avoiding the capacity loss of the battery cell 10, and further preventing the tabs 201 from being squeezed.
  • the contact between the positive and negative electrodes of the battery cells 10 can be further prevented, and the short circuit of the battery cells 10 can be better prevented, thereby further improving the use safety of the battery 100 .
  • it can also ensure that the bending angle of the tab 201 is more suitable.
  • the pole core 20 is configured as a wound pole core 20 , and when the pole core 20 is drawn out of the pole tab 201 by a half pole tab lead-out method, it should be noted that the half pole tab
  • the lead-out method of the pole-tab means that after the pole-core 20 is wound, only one piece of pole-tab 201 is drawn out for each turn of the pole-core 20, which is called the half-pole-lug lead-out method.
  • the thickness of the pole core 20 is D
  • the length of the pole ear 201 exposed to the pole core 20 in the extension direction of the pole ear 201 is L 2 .
  • the length of the free area of the tab is L 3 , which satisfies the relation: 0.25D ⁇ L 3 ⁇ L 2 .
  • a plurality of tabs 201 converge to form a converging and leading position of the tabs.
  • the confluent and leading positions of the tabs may include a zero leading position 50 , a median leading position 60 and an offset leading position 50 .
  • the confluence and lead-out position of the tabs may be located at the zero-position lead-out position 50 , and as shown in FIG. Among them, the median lead-out position 60 coincides with the central axis 80 of the pole core.
  • the zero-position lead-out position 50 is located on the axis where the outermost layer of the pole core 20 is located, and the offset lead-out position 70 is located at the zero-position lead-out.
  • the thicker the cell 10 is the closer the tabs 201 converge and lead-out position is to the neutral lead-out position 60, and the smaller the thickness of the cell 10 is, the closer the tabs 201 converge and lead-out position is to zero.
  • the lead-out position 50 is set in this way, which can make the tab bending angle of the tab 201 suitable, which can ensure that the tab 201 will not squeeze the diaphragm 202, and reduce the risk of damage to the diaphragm 202, thereby reducing the risk of short circuit inside the battery cell 10. , thereby improving the use safety of the battery 100 .
  • the all-tab lead-out method refers to when the pole core 20 is a lamination
  • each pole piece of the pole core 20 has a pole lug 201 to lead out, and this lead-out method is an all-pole lug lead-out method; or when the pole core 20 is a winding type pole core, the diameter of the pole core 20 is In the center of symmetry, two pole lugs 201 are symmetrically arranged on each circle of the pole piece of the pole core 20 , and the arrangement of the pole lugs 201 is also an all-pole lug lead-out method.
  • the laminated type pole core 20 must be led out of all poles, and the winding type pole core 20 can be selected from all poles, or not.
  • the thickness of the pole core 20 is D
  • the length of the pole tab 201 exposed to the pole core 20 in the extension direction of the pole tab 201 is L 2 , that is, the length of the pole tab 201 exposed to the diaphragm 202 in the extension direction of the pole tab 201 is L 2
  • the length of the free area of the tab is L 3 , which satisfies the relation: 0.5D ⁇ L 3 ⁇ L 2 .
  • This setting can make the length of the free area of the tab suitable, and can prevent the tab 201 from tearing and extrusion.
  • the tabs 201 can also reduce the risk of short circuit of the battery cell 10 .
  • a plurality of tabs 201 converge to form a tab converging and leading position.
  • the tab converging and leading positions include a zero leading position 50 , a middle leading position 60 and an offset leading position 70 .
  • the confluence and lead-out position of the tabs can be located at the neutral lead-out position 60 , which can make the tab bending angle of the tabs 201 suitable, ensure that the tabs 201 will not squeeze the diaphragm 202 , and reduce the damage of the diaphragm 202 Therefore, the risk of short circuit inside the battery cell 10 can be reduced, and the use safety of the battery 100 can be improved.
  • the welding point 40 may be disposed in the welding point area of the tab 201, the welding point area may include an ultrasonic welding area and a laser welding area, and the laser welding area is located in the ultrasonic welding area, that is, the laser welding area The welding area coincides with the ultrasonic welding area.
  • the plurality of tabs 201 are first welded together by ultrasonic welding in the ultrasonic welding area, so that the plurality of tabs 201 are joined, and then the joined tabs 201 are welded on the cover plate 30 by laser welding in the laser welding area.
  • This arrangement can reliably weld the plurality of tabs 201 on the cover plate 30 , and can prevent the plurality of tabs 201 from being separated from the cover plate 30 , thereby ensuring the operational reliability of the battery 100 .
  • the width of the ultrasonic welding area can be set to 4-8 mm, preferably, the width of the ultrasonic welding area is set to 6 mm, so that the width of the ultrasonic welding area can be set appropriately, and more The tabs 201 are reliably welded together, and the welding quality can also be guaranteed.
  • the distance between the pole core 20 and the welding spot refers to the distance between the pole core 20 and the center point of the laser welding spot.
  • the battery 100 package includes the battery 100 of the above-mentioned embodiment.
  • the battery 100 is arranged in the battery 100 package, which can make the distance between the pole core 20 and the solder joint 40 more suitable, and avoid the bending of the pole tab 201. Being pulled, tearing can be prevented, thereby avoiding the capacity loss of the battery cell 10, and the movable length of the tab 201 can also be made suitable, so that the bending space can be suitable, so as to avoid the capacity loss of the battery cell 10, and also prevent The tabs 201 are squeezed, so that the use safety of the battery 100 can be improved.

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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)

Abstract

电芯（10），所述电芯（10）具有至少一个极芯（20），每个所述极芯（20）具有多个极耳（201），多个所述极耳（201）汇合后与所述电池（100）的盖板（30）焊接并形成焊点，所述极芯（20）未合芯前或所述极芯（20）展开与所述盖板（30）平行时，所述极芯（20）至所述焊点间的间隔距离根据所述极芯（20）的厚度、所述极耳（201）的极耳（201）折弯角、所述焊点处的极耳（201）保护片的宽度确定。

Description

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“电池以及电池包”的、中国专利申请号“202010900497.8”的优先权。
技术领域
本申请涉及电池领域，尤其是涉及一种电池以及具有该电池的电池包。
背景技术
相关技术中，极芯的多个极耳汇合后焊接在一起，焊点位置影响极耳自由区的长度，极芯未合芯前或极芯展开后与盖板平行时，如果极芯至焊点的中点位置间的间隔距离设计过小，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。
如果极芯至焊点的中点位置间的间隔距离设计过大，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，电池具有安全风险。
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，本申请的一个目的在于提出了一种电池，该电池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具有上述电池的电池包。
根据本申请的电池包括：电芯，所述电芯具有至少一个极芯，每个所述极芯具有多个极耳，多个所述极耳汇合后与所述电池的盖板焊接并形成焊点，所述极芯未合芯前或所述极芯展开后与所述盖板平行时，所述极芯至所述焊点间的间隔距离根据所述极芯的厚度、所述极耳的极耳折弯角、所述焊点处的极耳保护片的宽度确定。
根据本申请的电池，能够使极芯至焊点间的间隔距离更加适宜，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，从而可以提升电池的使用安全性。
在本申请的一些示例中，所述极芯至所述焊点间的间隔距离为L 1，所述极芯的厚度 为D，所述极耳保护片的宽度为d 1，所述极耳的极耳折弯角为A，满足关系式：L 1＝D/2*tanA+d 1/2。
在本申请的一些示例中，45°≤A≤135°。
在本申请的一些示例中，所述极芯未合芯前或所述极芯展开后与所述盖板平行时，所述极芯和所述焊点之间形成极耳自由区，所述极耳自由区的长度根据所述极芯的极耳引出方式确定。
在本申请的一些示例中，所述极芯构造为卷绕型极芯，所述极芯通过半极耳引出方式引出所述极耳时，所述极芯的厚度为D，在所述极耳的延伸方向所述极耳露出所述极芯的长度为L 2，所述极耳自由区的长度为L 3，满足关系式：0.25D＜L 3＜L 2。
在本申请的一些示例中，所述极芯通过全极耳引出方式引出所述极耳时，所述极芯的厚度为D，在所述极耳的延伸方向所述极耳露出所述极芯的长度为L 2，所述极耳自由区的长度为L 3，满足关系式：0.5D＜L 3＜L 2。
在本申请的一些示例中，多个所述极耳汇合并形成极耳汇合引出位置，在所述极芯厚度方向，所述极耳汇合引出位置包括零位引出位置、中位引出位置和偏置引出位置；所述极耳汇合引出位置位于所述零位引出位置或所述偏置引出位置。
在本申请的一些示例中，多个所述极耳汇合并形成极耳汇合引出位置，在所述极芯厚度方向，所述极耳汇合引出位置包括零位引出位置、中位引出位置和偏置引出位置；所述极耳汇合引出位置位于所述中位引出位置。
在本申请的一些示例中，所述极耳保护片的宽度为8-12mm。
在本申请的一些示例中，所述焊点设于所述极耳的焊点区域，所述焊点区域包括超声焊区域和激光焊区域，所述激光焊区域位于所述超声焊区域内。
在本申请的一些示例中，在所述极耳的延伸方向所述超声焊区域的宽度为4-8mm。
根据本申请的电池包，包括上述的电池。
根据本申请的电池包设置有上述实施例的电池，由于本申请的电池包设置有上述实施例的电池,因此电池包具有安全性。
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截面图；
图2是根据本申请实施例的电池的极芯展开后与盖板平行时的示意图；
图3是根据本申请实施例的电池的极芯位于零位引出位置的示意图；
图4是根据本申请实施例的电池的极芯位于偏置引出位置的示意图；
图5是根据本申请实施例的电池的极芯位于中位引出位置的示意图。
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5描述根据本申请实施例的电池100。
如图1-图5所示，根据本申请实施例的电池100包括：电芯10，电芯10具有至少一个极芯20，每个极芯20具有多个极耳201，多个极耳201汇合后与电池100的盖板30焊接并形成焊点40，极芯20未合芯前或者极芯20展开后与盖板30平行时，也可以理解为，极芯20未合芯前与盖板30平行时，或者极芯20展开后与盖板30平行时，极芯20至焊点40间的间隔距离根据极芯20的厚度、极耳201的极耳折弯角、在极耳201的延伸方向焊点40处的极耳保护片的宽度确定。
其中，焊点40处设有极耳保护片，每个极芯20具有多个隔膜202，隔膜202的与焊点40相对的端部至焊点40间的间隔距离根据极芯20的厚度、极耳201的极耳折弯角、在极耳201的延伸方向极耳保护片的宽度确定，需要说明的是，极芯20的厚度方向是指图3-图5中极芯20的厚度方向，极耳201的延伸方向是指图3-图5中的左右方向。
通过使极芯20至焊点40间的间隔距离根据极芯20的厚度、极耳201的极耳折弯角、在极耳201的延伸方向焊点40处的极耳保护片的宽度确定，能够使极芯20至焊点40间的间隔距离更加适宜，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，进而可以提升电池100的使用安全性。
在本申请的一些实施例中，极芯20至焊点40间的间隔距离为L 1，极芯20的厚度为D，极耳保护片的宽度为d 1，极耳201的极耳折弯角为A，满足关系式：L1＝D/2*tanA+d 1/2，其中，极耳201折弯角A满足关系式：45°≤A≤135°，极芯20的隔膜202的与焊点40相对的端部至焊点40间的间隔距离为L 1，如此设置能够进一步 避免极耳201折弯后被拉扯，可以进一步防止极耳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，也能够使极耳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。
在本申请的一些实施例中，极耳保护片的宽度可以设置为8-12mm，这样设置能够使极耳保护片的宽度适宜，可以更好地对极耳201进行保护，也能够进一步避免极耳201折弯后被拉扯，可以进一步防止极耳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，还能够使极耳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。
在本申请的一些实施例中，极芯20未合芯前或者极芯20展开后与盖板30平行时，也可以理解为，极芯20未合芯前与盖板30平行时，或者极芯20展开后与盖板30平行时，如图2所示，在极耳201的延伸方向，极芯20和焊点40之间形成极耳自由区。在本申请的一个实施例中，多个极耳201汇合后，隔膜202的与焊点40相对的端部和焊点40之间形成极耳自由区，极耳自由区的长度根据极芯20的极耳201引出方式确定，这样设置能够使极耳自由区的长度更加适宜，可以进一步避免极耳201折弯后被拉扯，可以进一步避免部分极片无法进行电引出，从而可以进一步避免电芯10容量损失。并且，也能够使极耳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。同时，也能够保证极耳201折弯角更加适宜。
根据本申请的一个实施例，如图3和图4所示，极芯20构造为卷绕型极芯20，极芯20通过半极耳引出方式引出极耳201时，需要说明的是，半极耳引出方式是指极芯20卷绕后，极芯20卷绕的每圈只有一片极耳201引出，称为半极耳引出方式，半极耳引出方式只适用于卷绕类极芯20，极芯20的厚度为D，在极耳201的延伸方向极耳201露出极芯20的长度为L 2，也可以理解为，在极耳201的延伸方向极耳201露出隔膜202的长度为L 2，极耳自由区的长度为L 3，满足关系式：0.25D＜L 3＜L 2，多个极耳201焊接在一起后，如此设置能够使极耳自由区的长度尺寸适宜，可以防止极耳201撕裂，也可 以防止挤压极耳201，还可以降低电芯10发生短路的风险。
在本申请的一些实施例中，多个极耳201汇合并形成极耳汇合引出位置，在极芯20厚度方向，极耳汇合引出位置可以包括零位引出位置50、中位引出位置60和偏置引出位置70。如图3所示，极耳汇合引出位置可以位于零位引出位置50，如图4所示，极耳汇合引出位置可以位于偏置引出位置70。其中，中位引出位置60与极芯中心轴线80重合，在极芯20的厚度方向，零位引出位置50位于极芯20的最外层所在的轴线上，偏置引出位置70位于零位引出位置50和中位引出位置60之间，电芯10的厚度越大则极耳201汇合引出位置越靠近中位引出位置60，电芯10的厚度越小则极耳201汇合引出位置越靠近零位引出位置50，这样设置能够使极耳201的极耳折弯角适宜，可以保证极耳201不会挤压隔膜202，降低隔膜202破损的风险，从而可以降低电芯10内部发生短路的风险，进而可以提升电池100的使用安全性。
根据本申请的另一个实施例，如图5所示，极芯20通过全极耳引出方式引出极耳201时，需要说明的是，全极耳引出方式是指，当极芯20为叠片式极芯时，极芯20的每个极片上均有极耳201引出，这种引出方式为全极耳引出方式；或当极芯20为卷绕型极芯时，以极芯20直径为对称中心，极芯20每圈极片上对称设有两个极耳201，这种极耳201的设置方式也为全极耳引出方式。叠片类极芯20必需全极耳引出，卷绕类极芯20可选择全极耳引出，也可不选择全极耳引出。极芯20的厚度为D，在极耳201的延伸方向极耳201露出极芯20的长度为L 2，也就是说，在极耳201的延伸方向极耳201露出隔膜202的长度为L 2，极耳自由区的长度为L 3，满足关系式：0.5D＜L 3＜L 2，这样设置能够使极耳自由区的长度尺寸适宜，可以防止极耳201撕裂，也可以防止挤压极耳201，还可以降低电芯10发生短路的风险。
进一步地，多个极耳201汇合并形成极耳汇合引出位置，在极芯20厚度方向，极耳汇合引出位置包括零位引出位置50、中位引出位置60和偏置引出位置70。如图5所示，极耳汇合引出位置可以位于中位引出位置60，这样设置能够使极耳201的极耳折弯角适宜，可以保证极耳201不会挤压隔膜202，降低隔膜202破损的风险，从而可以降低电芯10内部发生短路的风险，进而可以提升电池100的使用安全性。
在本申请的一些实施例中，焊点40可以设置于极耳201的焊点区域，焊点区域可以包括超声焊区域和激光焊区域，激光焊区域位于超声焊区域内，也就是说，激光焊区域与超声焊区域重合。其中，多个极耳201首先在超声焊区域通过超声焊焊接在一起，使多个极耳201汇合，然后把汇合后的极耳201在激光焊区域通过激光焊焊接在盖板30上。如此设置能够将多个极耳201可靠地焊接在盖板30上，可以防止多个极耳201 与盖板30分离，从而可以保证电池100的工作可靠性。
进一步地，在极耳201的延伸方向，超声焊区域的宽度可以设置为4-8mm，优选地，超声焊区域的宽度设置为6mm，这样设置能够使超声焊区域的宽度尺寸适宜，可以将多个极耳201可靠地焊接在一起，也可以保证焊接质量。需要说明的是，极芯20至焊点的间隔距离是指极芯20至激光焊焊点的中心点的间隔距离。
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，能够使极芯20至焊点40间的间隔距离更加适宜，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，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，从而可以提升电池100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 (12)

  1. 一种电池，其特征在于，包括：
    电芯，所述电芯具有至少一个极芯，每个所述极芯具有多个极耳，多个所述极耳汇合后与所述电池的盖板焊接并形成焊点，所述极芯未合芯前或所述极芯展开与所述盖板平行时，所述极芯至所述焊点间的间隔距离根据所述极芯的厚度、所述极耳的极耳折弯角、所述焊点处的极耳保护片的宽度确定。
  2. 根据权利要求1所述的电池，其特征在于，所述极芯至所述焊点间的间隔距离为L 1，所述极芯的厚度为D，所述极耳保护片的宽度为d 1，所述极耳的极耳折弯角为A，满足关系式：L 1＝D/2*tanA+d 1/2。
  3. 根据权利要求2所述的电池，其特征在于，45°≤A≤135°。
  4. 根据权利要求1-3中任意一项所述的电池，其特征在于，所述极芯未合芯前或所述极芯展开后与所述盖板平行时，所述极芯和所述焊点之间形成极耳自由区，所述极耳自由区的长度根据所述极芯的极耳引出方式确定。
  5. 根据权利要求4所述的电池，其特征在于，所述极芯构造为卷绕型极芯，所述极芯通过半极耳引出方式引出所述极耳时，所述极芯的厚度为D，在所述极耳的延伸方向所述极耳露出所述极芯的长度为L 2，所述极耳自由区的长度为L 3，满足关系式：0.25D＜L 3＜L 2。
  6. 根据权利要求4或5所述的电池，其特征在于，所述极芯通过全极耳引出方式引出所述极耳时，所述极芯的厚度为D，在所述极耳的延伸方向所述极耳露出所述极芯的长度为L 2，所述极耳自由区的长度为L 3，满足关系式：0.5D＜L 3＜L 2。
  7. 根据权利要求5或6所述的电池，其特征在于，多个所述极耳汇合并形成极耳汇合引出位置，在所述极芯厚度方向，所述极耳汇合引出位置包括零位引出位置、中位引出位置和偏置引出位置；
    所述极耳汇合引出位置位于所述零位引出位置或所述偏置引出位置。
  8. 根据权利要求6所述的电池，其特征在于，多个所述极耳汇合并形成极耳汇合引出位置，在所述极芯厚度方向，所述极耳汇合引出位置包括零位引出位置、中位引出位置和偏置引出位置；
    所述极耳汇合引出位置位于所述中位引出位置。
  9. 根据权利要求1-8中任意一项所述的电池，其特征在于，所述极耳保护片的宽度为8-12mm。
  10. 根据权利要求1-9中任意一项所述的电池，其特征在于，所述焊点设于所述极 耳的焊点区域，所述焊点区域包括超声焊区域和激光焊区域，所述激光焊区域位于所述超声焊区域内。
  11. 根据权利要求10所述的电池，其特征在于，在所述极耳的延伸方向所述超声焊区域的宽度为4-8mm。
  12. 一种电池包，其特征在于，包括根据权利要求1-11中任一项所述的电池。
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