WO2024077652A1 - 芯包及动力电池 - Google Patents

芯包及动力电池 Download PDF

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Publication number
WO2024077652A1
WO2024077652A1 PCT/CN2022/126554 CN2022126554W WO2024077652A1 WO 2024077652 A1 WO2024077652 A1 WO 2024077652A1 CN 2022126554 W CN2022126554 W CN 2022126554W WO 2024077652 A1 WO2024077652 A1 WO 2024077652A1
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WO
WIPO (PCT)
Prior art keywords
weld mark
pole
tab
tabs
weld
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.)
Ceased
Application number
PCT/CN2022/126554
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English (en)
French (fr)
Inventor
林陈能
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.)
Eve Power Co Ltd
Original Assignee
Eve Power 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 Eve Power Co Ltd filed Critical Eve Power Co Ltd
Priority to US18/567,129 priority Critical patent/US20250087850A1/en
Priority to EP22944045.8A priority patent/EP4376209A4/en
Priority to JP2023552511A priority patent/JP2024540785A/ja
Publication of WO2024077652A1 publication Critical patent/WO2024077652A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/538—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M50/536—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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/595—Tapes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/103—Fuse
    • 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

Definitions

  • the present application relates to the field of battery technology, for example, to a core pack and a power battery.
  • the core pack includes a body and multiple layers of tabs connected to the body.
  • the tabs are first welded to the poles on the top cover, and then the tabs are shaped and installed in the battery shell and top cover to maximize the internal space utilization and improve the battery density.
  • the end of the tab close to the body cannot be completely folded, especially the outermost layer or layers of tabs are difficult to fold, which makes it difficult to shape the tabs, and the tabs are easily inserted into the body backwards to cause a short circuit.
  • the present application provides a core pack and a power battery, which enable the end of the pole ear close to the body to be completely retracted, thereby solving the problem of difficulty in shaping the pole ear and preventing the pole ear from being inserted backwards into the body and causing a short circuit.
  • an embodiment of the present application provides a core pack, comprising a main body and a plurality of layers of pole tabs, wherein one end of the plurality of layers of pole tabs is connected to the main body, and the other end is used to be connected to a pole of a battery, and the plurality of layers of pole tabs are welded to form a first weld mark, and the first weld mark is arranged at the root of the pole tab and the first weld mark is arranged close to the main body to allow the plurality of layers of pole tabs to be retracted.
  • the multiple layers of the electrode tabs are welded to form a second weld mark, the second weld mark is spaced apart from the first weld mark, and the electrode tab is connected to the pole via the second weld mark.
  • the interval distance between the second weld mark and the first weld mark is 4 mm-6 mm.
  • the length of the second weld mark is the same as the length of the first weld mark; and/or
  • the tab is shaped into a V-shape, and the first weld mark and the second weld mark are arranged at an angle.
  • a fuse hole is provided between the first weld mark and the second weld mark.
  • the cross-sectional area of the opening region of the fuse hole is A, and A1 ⁇ A ⁇ A2 , wherein A1 is the minimum cross-sectional area of the tab that meets the overcurrent condition, and A2 is the maximum cross-sectional area that is blown under the short-circuit current.
  • a protective adhesive layer is attached to the tab and the diaphragm of the body.
  • the length of the protective rubber layer on the side facing the pole ear that exceeds the diaphragm is 15mm-30mm, and the width of the protective rubber layer is not less than the width of the pole ear;
  • the protective adhesive layer covers the first weld mark and the fuse hole, and the spacing distance between the protective adhesive layer and the second weld mark is 1mm-2mm.
  • an embodiment of the present application provides a power battery, comprising a shell, a top cover assembly and the above-mentioned core pack, wherein the core pack is arranged in a accommodating space formed by the shell and the top cover assembly, and the pole ears on the core pack are connected to the poles on the top cover assembly.
  • the present application provides a core pack and a power battery, wherein the first weld mark gathers the roots of the multi-layer pole ears together, and when the core pack is placed in a shell, the pole ears are shaped. Due to the effect of the first weld mark, the multi-layer pole ears are shaped at the same time, and it is prevented that the multi-layer pole ears are spread out and inserted inversely into the body to cause a short circuit, thereby improving reliability; and the battery can be folded according to the size of the first weld mark, without the need for shaping of a single-layer pole ear, and is convenient for folding and shaping.
  • FIG1 is a cross-sectional view of a core package provided in a specific embodiment of the present application.
  • FIG2 is a side view of a tab before shaping provided by a specific embodiment of the present application.
  • FIG. 3 is a side view of a pole ear after shaping provided in a specific embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • a first feature being “above” or “below” a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact.
  • a first feature being “above”, “above”, and “above” a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.
  • a first feature being “below”, “below”, and “below” a second feature may include the first feature being directly below and obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
  • the present embodiment provides a power battery, as shown in FIG1, comprising a shell, a top cover assembly and a core pack, the core pack is arranged in the accommodation space formed by the shell and the top cover assembly, and the pole tab 1 on the core pack is connected to the pole on the top cover assembly.
  • the present embodiment also provides a core pack, referring to FIG1, comprising a body 6 and a multi-layer pole tab 1, one end of the multi-layer pole tab 1 is connected to the body 6, and the other end is used to connect to the pole of the battery, the multi-layer pole tab 1 forms a first weld mark 2 by welding, and the first weld mark 2 is arranged at the root of the pole tab 1 and close to the body 6, so that the multi-layer pole tab 1 is retracted.
  • the first weld mark 2 realizes the folding of the roots of the multi-layer pole ear 1.
  • the pole ear 1 is shaped. Due to the effect of the first weld mark 2, the multi-layer pole ear 1 is shaped at the same time, which prevents the multi-layer pole ear 1 from spreading out and being inserted into the body 6 upside down to cause a short circuit, thereby improving reliability; and it can be folded according to the size of the first weld mark 2, without the need to shape the single-layer pole ear 1, which is convenient for folding and shaping.
  • the multilayer pole tab 1 is welded to form a second weld mark 3, the second weld mark 3 is spaced apart from the first weld mark 2, the second weld mark 3 is used to connect to the pole, and the second weld mark 3 gathers the pole tab 1 into a whole and then welds it to the pole, thereby improving the strength.
  • the pole lug 1 is first shaped into a V-shape according to the size of the first weld mark 2 and the second weld mark 3, and the first weld mark 2 and the second weld mark 3 are set at an angle, and then the core pack is placed in the shell, the first weld mark 2 is close to the body 6, and the second weld mark 3 is welded to the pole.
  • the pole lug 1 is shaped into a V-shape before being placed in the shell, and no additional shaping is required after being placed in the shell, which is convenient for shaping. At present, most of the pole lugs 1 are bent into a Z-shape.
  • the pole lug 1 Since the pole lug 1 has two wider weld mark structures, the pole lug 1 is easy to bend into a V-shape, and the V-shaped bend has one less layer than the Z-shaped bend, which improves the space utilization in the length direction of the core pack and increases the capacity.
  • a positive electrode tab 11 and a negative electrode tab 12 are provided at both ends of the body 6.
  • the positive electrode tab 11 is a multi-layer aluminum foil not coated with active material
  • the negative electrode tab 12 is a multi-layer copper foil not coated with active material. It has good conductivity and provides an electron channel for battery charging and discharging.
  • the electrode tab 1 may be welded to form the first weld mark 2 by, but is not limited to, flat-tooth welding, round-tooth welding or square-tooth welding.
  • the specific thickness of the first weld mark 2 is designed according to the thickness of the body 6, and the value of X 1 is selected according to the actual situation without limitation.
  • the specific length of the first weld mark 2 is designed according to the length of the laser weld mark during laser welding, and the value of Y 1 is selected according to the actual situation without limitation, to ensure that there is no cracking of the pole ear 1 after welding, and each layer of the pole ear 1 is welded together.
  • the thickness and length of the first weld mark 2 avoid difficulties in shell entry due to excessive size, and also avoid poor shaping effect due to excessive size.
  • the tab 1 can be welded by flat-tooth welding to form the second weld mark 3.
  • the spacing distance between the second weld mark 3 and the first weld mark 2 is 4mm-6mm, ensuring that there is enough spacing to shape the tab 1 into a V shape, avoiding the first weld mark 2 and the second weld mark 3 being too small due to the spacing being too large, and avoiding the angle between the first weld mark 2 and the second weld mark 3 being too large due to the spacing being too small to be shaped, which ultimately leads to a large space occupation.
  • Z 2 is a redundancy, which can effectively ensure the overcurrent and maximize the use of space. Its specific value is selected according to the actual situation and is not limited. For example, Z 2 is 3mm.
  • a fuse hole 4 is provided between the first weld mark 2 and the second weld mark 3.
  • the fuse hole 4 is specifically a through hole.
  • the fuse hole 4 is preferably provided in the middle of the first weld mark 2 and the second weld mark 3.
  • the middle non-flux area is punched with a mold.
  • the shape of the fuse hole 4 can be, but is not limited to, a rectangle, an ellipse, etc., to reduce the cross-sectional area of the tab 1 in the width direction.
  • the fuse hole 4 has a small cross-sectional area and a large local resistance.
  • the cross-sectional area of the opening region of the fuse hole 4 is A, and A 1 ⁇ A ⁇ A 2 , wherein A 1 is the minimum cross-sectional area of the tab 1 that meets the overcurrent condition, and A 2 is the maximum cross-sectional area that is melted under the short-circuit current.
  • the main body 6 includes a positive electrode sheet 61, a negative electrode sheet 62 and a separator 63.
  • the positive electrode sheet 61 is coated with a positive electrode active material, releases and receives lithium ions during the battery charging and discharging process, and an electrochemical reaction occurs at the solid-liquid interface of the positive electrode active material;
  • the negative electrode sheet 62 is coated with a negative electrode active material, receives and releases lithium ions during the battery charging and discharging process, and an electrochemical reaction occurs at the solid-liquid interface of the positive electrode active material;
  • the separator 63 is made of a thin film made of PE, PP or a composite material thereof, and has the function of conducting ions and isolating electrons; specifically, the positive electrode sheet 61, the negative electrode sheet 62 and the separator 63 can be formed by winding or the like.
  • a protective adhesive layer 5 is attached to the tab 1 and the diaphragm 63 of the body 6.
  • the protective adhesive layer 5 has sufficient strength, adhesion, electrolyte corrosion resistance, and high temperature resistance.
  • the protective adhesive layer 5 may be, but is not limited to, acrylic brown high-temperature adhesive.
  • the protective adhesive layer 5 is attached to the tab 1 to effectively avoid the short circuit caused by the connection between the tab 1 and the aluminum shell.
  • the protective adhesive layer 5 is attached to the diaphragm 63 of the body 6 to effectively avoid the short circuit caused by the direct contact between the negative electrode sheet 62 and the aluminum shell when the diaphragm 63 is deflated to the outside and causes a short circuit.
  • the length of the protective rubber layer 5 on the side facing the pole lug 1 exceeds the diaphragm 63 by 15mm-30mm, and the width of the protective rubber layer 5 is not less than the width of the pole lug 1, so that the protective rubber layer 5 completely covers the width direction of the pole lug 1; the protective rubber layer 5 covers the first weld mark 2 and the fuse hole 4, and the spacing distance between the protective rubber layer 5 and the second weld mark 3 is 1mm-2mm to prevent the laser from hitting the protective rubber layer 5 formed by the adhesive tape during laser welding and causing a fried weld.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请公开了一种芯包及动力电池，属于电池技术领域。芯包包括本体和多层极耳，多层极耳的一端连接于本体，另一端用于与电池的极柱连接，多层极耳通过焊接形成第一焊印，第一焊印设于极耳的根部且第一焊印靠近本体设置，以使多层极耳收拢。本申请的芯包及动力电池，使极耳靠近本体的一端进行完全收拢，解决了极耳整形困难的问题，防止了极耳倒插入本体中而短路。

Description

芯包及动力电池
本申请要求在2022年10月11日提交中国专利局、申请号为202222673846.4的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，例如涉及一种芯包及动力电池。
背景技术
相关技术中，芯包包括本体和连接在本体上的多层极耳，电池组装时，先将极耳与顶盖上的极柱焊接，再对极耳进行整形装入电池的壳体和顶盖中，将内部空间利用率提高到最大，以提高电池密度。然而，极耳靠近本体的一端无法完全收拢，尤其是靠近最外侧的一层或几层极耳难以收拢，导致极耳整形困难，极耳容易倒插入本体中造成短路。
发明内容
本申请提供了一种芯包及动力电池，使极耳靠近本体的一端进行完全收拢，解决极耳整形困难的问题，防止极耳倒插入本体中而短路。
第一方面，本申请实施例提供了一种芯包，包括本体和多层极耳，多层所述极耳的一端连接于所述本体，另一端用于与电池的极柱连接，多层所述极耳通过焊接形成第一焊印，所述第一焊印设于所述极耳的根部且所述第一焊印靠近所述本体设置，以使多层所述极耳收拢。
在一实施例中，所述第一焊印的厚度为B 1，B 1＝B-X 1，其中，B为本体的厚度，X 1的取值范围为2mm-5mm；和/或
所述第一焊印的长度为L 1，L 1＝L+Y 1，其中，L为焊接工具产生的焊印长度，Y 1的取值范围为4mm-6mm。
在一实施例中，多层所述极耳通过焊接形成第二焊印，所述第二焊印与所述第一焊印间隔设置，所述极耳通过所述第二焊印与所述极柱连接。
在一实施例中，所述第二焊印和所述第一焊印之间的间隔距离为4mm-6mm。
在一实施例中，所述第二焊印的长度与所述第一焊印长度相同；和/或
所述第二焊印的宽度为C 2，C 2＝N*C+(N-1)*1.5+Z 2，其中，N为第二焊印的 数量，C为焊接工具产生的焊印宽度，Z 2的取值范围为2mm-4mm。
在一实施例中，所述极耳整形呈V形，所述第一焊印和所述第二焊印呈夹角设置。
在一实施例中，所述极耳为正极极耳时，所述第一焊印和所述第二焊印之间设有熔断孔。
在一实施例中，所述熔断孔的开孔区域截面积为A，且A 1≤A≤A 2，其中，A 1为极耳满足过流电流下的最小截面积，A 2为短路电流下熔断的最大截面积。
在一实施例中，所述极耳和所述本体的隔膜上贴设有保护胶层。
在一实施例中，所述保护胶层朝向极耳的一侧超出隔膜的长度为15mm-30mm，且所述保护胶层的宽度不小于所述极耳的宽度；和/或
所述保护胶层包覆第一焊印和熔断孔，且所述保护胶层与所述第二焊印之间的间隔距离为1mm-2mm。
第二方面，本申请实施例提供了一种动力电池，包括壳体、顶盖组件和上述的芯包，所述芯包设于所述壳体和所述顶盖组件形成的容纳空间内，芯包上的极耳与所述顶盖组件上的极柱连接。
本申请的有益效果：
本申请提供的一种芯包及动力电池，第一焊印使多层极耳的根部收拢在一起，当芯包装入壳体后，对极耳进行整形，由于第一焊印的作用，使多层极耳同时进行整形，避免多层极耳散开而倒插入本体中而导致短路，提高了可靠性；并且可以按照第一焊印尺寸进行折叠，无需单层极耳整形，方便收拢，整形方便。
附图说明
图1是本申请的具体实施方式提供的芯包的剖视图；
图2是本申请的具体实施方式提供的极耳整形前的侧视图；
图3是本申请的具体实施方式提供的极耳整形后的侧视图。
图中：
1、极耳；11、正极极耳；12、负极极耳；2、第一焊印；3、第二焊印；4、熔断孔；5、保护胶层；6、本体；61、正极片；62、负极片；63、隔膜。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一特征和第二特征直接接触，也可以包括第一特征和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
本实施例提供了一种动力电池，如图1所示，包括壳体、顶盖组件和芯包，芯包设于壳体和顶盖组件形成的容纳空间内，芯包上的极耳1与顶盖组件上的极柱连接。本实施例还提供了一种芯包，参照图1，包括本体6和多层极耳1，多层极耳1的一端连接于本体6，另一端用于与电池的极柱连接，多层极耳1通过焊接形成第一焊印2，第一焊印2设于极耳1的根部且靠近本体6设置，以使多层极耳1收拢。
第一焊印2实现了多层极耳1的根部收拢在一起，当芯包装入壳体后，对极耳1进行整形，由于第一焊印2的作用使多层极耳1同时进行整形，避免多层极耳1散开而倒插入本体6中而导致短路，提高了可靠性；并且可以按照第一焊印2尺寸进行折叠，无需单层极耳1整形，方便收拢，整形方便。
在一种实施方式中，如图1所示，多层极耳1通过焊接形成第二焊印3，第二焊印3与第一焊印2间隔设置，第二焊印3用于与极柱连接，第二焊印3将极耳1收拢形成一个整体再与极柱焊接，提高了强度。
在一种实施方式中，如图1-图3所示，将极耳1根据第一焊印2和第二焊印3的尺寸先进行整形形成V形，第一焊印2和第二焊印3呈夹角设置，之后再将芯包装入壳体，第一焊印2靠近本体6，第二焊印3与极柱焊接。将极耳1在装入壳体之前整形呈V形，装入壳体后无须额外整形，整形方便。目前大部分极耳1整形均折弯为Z形，由于极耳1有两个较宽的焊印结构，极耳1方便弯折为V形，并且，V形折弯比Z形折弯会少一层，提高芯包长度方向的空间利用，提高容量。
如图1-图3所示，本体6的两端设有正极极耳11和负极极耳12，正极极耳11为未涂覆活性物质的多层铝箔，负极极耳12为未涂覆活性物质的多层铜箔， 具有良好的导电性，为电池充放电提供电子通道。
在一种实施方式中，可以但不仅限于采用平齿焊、圆齿焊或方齿焊对极耳1进行焊接形成第一焊印2。
在一种实施方式中，第一焊印2的厚度为B 1，B 1＝B-X 1，其中，B为本体6的厚度，X 1的取值范围为2mm-5mm。第一焊印2的具体厚度根据本体6的厚度进行设计，X 1的取值根据实际情况进行选值，不进行限定。在一种实施方式中，第一焊印2的长度为L 1，L 1＝L+Y 1，其中，L为焊接工具产生的焊印长度，Y 1的取值范围为4mm-6mm。第一焊印2的具体长度根据激光焊接时激光焊印长度进行设计，Y 1的取值根据实际情况进行选值，不进行限定，保证焊接后无极耳1开裂，各层极耳1均焊接在一起。第一焊印2的厚度和长度尺寸避免尺寸过大而造成入壳困难，也避免尺寸过小而导致整形效果差。
在一种实施方式中，可以采用平齿焊对极耳1进行焊接形成第二焊印3。在一种实施方式中，第二焊印3和第一焊印2之间的间隔距离为4mm-6mm，保证有足够的间距使极耳1整形呈V形，避免间距过大而导致第一焊印2和第二焊印3尺寸过小，也避免间距过小难以整形导致第一焊印2和第二焊印3之间的夹角过大，最终导致占用空间大。在一种实施方式中，第二焊印3的长度与第一焊印2长度相同；第二焊印3的宽度为C 2，C 2＝N*C+(N-1)*1.5+Z 2，其中，N为第二焊印3的数量，C为焊接工具产生的焊印宽度，Z 2的取值范围为2mm-4mm，根据激光焊接时激光焊印的宽度和数量决定，具体Z 2为冗余量，既能有效保证过流，又能最大程度利用空间，其具体取值根据实际情况进行选择，不进行限定，示例性地，Z 2取值为3mm。
在一种实施方式中，如图1所示，极耳1为正极极耳11时，第一焊印2和第二焊印3之间设有熔断孔4，熔断孔4具体为通孔，熔断孔4优选设置在第一焊印2和第二焊印3的正中间，将第一焊印2和第二焊印3居中对着时，将中间未焊剂区域采用模具进行冲孔，熔断孔4的形状可以但不限于长方形、椭圆形等，减少极耳1宽度方向截面积，熔断孔4处由于截面积小而局部电阻较大，电池发生外部短路时，局部在超高电流下温度急剧上升直到达到铝的熔化温度而熔断，保护芯包不至于达到热失控状态，提高芯包的安全性能。避免在第一焊印2或第二焊印3的焊接区域冲孔，以避免极耳1弯折时出现断裂。在一种实施方式中，熔断孔4的开孔区域截面积为A，且A 1≤A≤A 2，其中，A 1为极耳1满足过流电流下的最小截面积，A 2为短路电流下熔断的最大截面积。
在一种实施方式中，如图1所示，本体6包括正极片61、负极片62和隔膜63，正极片61涂覆有正极活性物质，在电池充放电过程中释放和接收锂离子，并在正极活性物质的固液界面发生电化学反应；负极片62涂覆有负极活性物质， 在电池充放电过程中接收和释放锂离子，并在正极活性物质的固液界面发生电化学反应；隔膜63的材质为PE、PP或其复合材料做成的薄膜，具备导通离子，隔绝电子的功能；具体正极片61、负极片62和隔膜63之间可以采用卷绕等方式进行成型。
在一种实施方式中，如图1所示，极耳1和本体6的隔膜63上贴设有保护胶层5，保护胶层5具备足够强度粘性、耐电解液腐蚀、耐高温性，保护胶层5可以但不仅限于为亚克力茶色高温胶；保护胶层5贴在极耳1上，可以有效规避极耳1与铝制的壳体之间连接造成的短路；保护胶层5贴设在本体6的隔膜63上，可以有效避免隔膜63向外放气时负极片62直接与铝制的壳体接触而造成短路，也可以使芯包和顶盖组件之间进行绝缘，防止短路。在一种实施方式中，保护胶层5朝向极耳1的一侧超出隔膜63的长度为15mm-30mm，且保护胶层5的宽度不小于极耳1的宽度，使保护胶层5完全包覆极耳1的宽度方向；保护胶层5包覆第一焊印2和熔断孔4，且保护胶层5与第二焊印3之间的间隔距离为1mm-2mm，以防止激光焊接时激光打在由胶纸形成的保护胶层5上而出现炸焊。

Claims (11)

  1. 一种芯包，包括本体(6)和多层极耳(1)，多层所述极耳(1)的一端连接于所述本体(6)，另一端用于与电池的极柱连接，多层所述极耳(1)通过焊接形成第一焊印(2)，所述第一焊印(2)设于所述极耳(1)的根部且所述第一焊印(2)靠近所述本体(6)设置，以使多层所述极耳(1)收拢。
  2. 根据权利要求1所述的芯包，其中，
    所述第一焊印(2)的厚度为B 1，B 1＝B-X 1，其中，B为所述本体(6)的厚度，X 1的取值范围为2mm-5mm；和/或
    所述第一焊印(2)的长度为L 1，L 1＝L+Y 1，其中，L为焊接工具产生的焊印长度，Y 1的取值范围为4mm-6mm。
  3. 根据权利要求1所述的芯包，其中，多层所述极耳(1)通过焊接形成第二焊印(3)，所述第二焊印(3)与所述第一焊印(2)间隔设置，所述极耳(1)通过所述第二焊印(3)与所述极柱连接。
  4. 根据权利要求3所述的芯包，其中，所述第二焊印(3)和所述第一焊印(2)之间的间隔距离为4mm-6mm。
  5. 根据权利要求3所述的芯包，其中，
    所述第二焊印(3)的长度与所述第一焊印(2)长度相同；和/或
    所述第二焊印(3)的宽度为C 2，C 2＝N*C+(N-1)*1.5+Z 2，其中，N为所述第二焊印(3)的数量，C为焊接工具产生的焊印宽度，Z 2的取值范围为2mm-4mm。
  6. 根据权利要求3所述的芯包，其中，所述极耳(1)整形呈V形，所述第一焊印(2)和所述第二焊印(3)呈夹角设置。
  7. 根据权利要求3-6任一项所述的芯包，其中，所述极耳(1)为正极极耳(11)时，所述第一焊印(2)和所述第二焊印(3)之间设有熔断孔(4)。
  8. 根据权利要求7所述的芯包，其中，所述熔断孔(4)的开孔区域截面积为A，且A 1≤A≤A 2，其中，A 1为所述极耳(1)满足过流电流下的最小截面积，A 2为短路电流下熔断的最大截面积。
  9. 根据权利要求3-6任一项所述的芯包，其中，所述极耳(1)和所述本体(6)的隔膜(63)上贴设有保护胶层(5)。
  10. 根据权利要求9所述的芯包，其中，
    所述保护胶层(5)朝向所述极耳(1)的一侧超出所述隔膜(63)的长度为15mm-30mm，且所述保护胶层(5)的宽度不小于所述极耳(1)的宽度；和/或
    所述保护胶层(5)包覆所述第一焊印(2)和熔断孔(4)，且所述保护胶层(5)与所述第二焊印(3)之间的间隔距离为1mm-2mm。
  11. 一种动力电池，包括壳体、顶盖组件和权利要求1-10任一项所述的芯包，所述芯包设于所述壳体和所述顶盖组件形成的容纳空间内，所述芯包上的极耳(1)与所述顶盖组件上的极柱连接。
PCT/CN2022/126554 2022-10-11 2022-10-21 芯包及动力电池 Ceased WO2024077652A1 (zh)

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