WO2023071065A1 - 一种锂离子电池装配工艺及锂离子电池 - Google Patents

一种锂离子电池装配工艺及锂离子电池 Download PDF

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Publication number
WO2023071065A1
WO2023071065A1 PCT/CN2022/086565 CN2022086565W WO2023071065A1 WO 2023071065 A1 WO2023071065 A1 WO 2023071065A1 CN 2022086565 W CN2022086565 W CN 2022086565W WO 2023071065 A1 WO2023071065 A1 WO 2023071065A1
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Prior art keywords
lithium
ion battery
cover plate
pole group
welding
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PCT/CN2022/086565
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English (en)
French (fr)
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崔红艳
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蜂巢能源科技股份有限公司
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Publication of WO2023071065A1 publication Critical patent/WO2023071065A1/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
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • 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
    • H01M50/543—Terminals
    • 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 technical field of lithium-ion batteries, in particular to a lithium-ion battery assembly process and a lithium-ion battery.
  • the energy density of the battery pack can be increased by increasing the capacity of a single battery cell.
  • the thickness of the cell and the length of the pole piece increase, resulting in difficulty in coating and aggravated deformation.
  • the industry usually adopts the method of splitting a single cell in the aluminum shell into at least two cells and putting them into the aluminum shell .
  • the assembly process in the production process of square lithium-ion batteries, the assembly process generally includes lamination, hot pressing, X-ray (X-ray) detection, tab pre-welding, tab cutting, connecting piece welding, connecting piece Welding with the cover plate, shelling, peripheral welding and other processes, the entire assembly process has many procedures, cumbersome operations, low production efficiency, and high product defect rate.
  • X-ray X-ray
  • the technical problem to be solved in this application is to overcome the defects of numerous and cumbersome assembly procedures in the lithium-ion battery assembly process in the prior art, so as to provide a lithium-ion battery assembly process with reduced assembly process procedures and simple operation.
  • Another technical problem to be solved by the present application is to overcome the defect of high defect rate of lithium-ion battery products in the prior art, so as to provide a lithium-ion battery with low product defect rate.
  • the application provides a lithium-ion battery assembly process, including:
  • Peripheral welding is performed on the periphery where the casing and the cover plate abut against each other.
  • the making pole group includes:
  • the components formed after lamination are hot-pressed to form pole groups.
  • the making pole group also includes:
  • pole groups After hot-pressing the laminated components to form pole groups, X-ray inspection is performed on the pole groups, and the qualified pole groups enter the next process, and the unqualified pole groups are reworked or scrapped.
  • the stacking according to a predetermined order includes cyclic stacking in the order of negative electrode sheet, separator, positive electrode sheet, and separator, and the number of cycles N ⁇ 1.
  • the method further includes:
  • the helium inspection includes short-circuit detection of peripheral welded batteries using helium inspection equipment.
  • the batteries that pass the inspection are marked as qualified batteries, and those that fail the inspection are reworked or scrapped.
  • the lithium-ion battery provided by the present application is manufactured by using the above-mentioned lithium-ion battery assembly process.
  • the lithium ion battery includes:
  • An electrode group, placed in the housing, the electrode group is provided with a positive tab and a negative tab;
  • the cover plate is fixedly connected with the open end of the housing, and the side of the cover plate facing the inside of the housing is fixedly connected with the pole lug of the pole group.
  • a first connecting portion and a second connecting portion are configured on the cover, the first connecting portion is adapted to be connected to the positive tab, and the second connecting portion is adapted to be connected to the negative tab .
  • the extending direction of the first connecting portion and the second connecting portion is the same as the extending direction of the positive tab and the negative tab of the pole group, and the first connecting portion and the The extending direction of the second connecting portion is perpendicular to the plane where the cover plate is located.
  • the first connection part is adapted to be connected to the positive tab by welding
  • the second connection part is suitable to be connected to the negative tab by welding.
  • the lithium-ion battery assembly process provided by this application is completed by setting up the processes including making electrode groups, pre-welding and cutting tabs, welding tabs and cover plates, pasting, encapsulating, shelling, and peripheral welding.
  • Lithium-ion battery assembly, and compared with the traditional lithium-ion battery production process, this application directly welds the tabs and the cover plate, thereby canceling the welding step of the connecting piece in the traditional process, and avoiding the problems caused by the welding process of the connecting piece. unqualified products, thus effectively reducing the production defect rate.
  • the pole group in the process of directly welding the tabs and the cover plate, can be directly fixed in the direction perpendicular to the plane of the cover plate, which is convenient
  • the pole assembly is put into the casing, compared with the traditional lithium-ion battery production process, the steps of core assembly are reduced, and the electrode bending caused by the tab bending during the core assembly process is avoided. Ear damage, and reduce the flip action of the pole group during the assembly process, thereby reducing the damage to the pole group, effectively improving the qualified rate of the product, and reducing the assembly process by canceling the welding of the connecting piece and canceling the new assembly method of the core , thereby improving production efficiency, reducing production defect rate, reducing equipment and energy consumption investment, and reducing production cost.
  • the negative electrode sheet, diaphragm, and positive electrode sheet are laminated in a predetermined order, and the components formed after lamination are hot-pressed, so that the separator and the negative electrode sheet,
  • the positive plate fits better, avoiding problems such as displacement between the diaphragm and the pole piece, and through X-ray detection of the hot-pressed pole group, it is possible to detect whether the pole pieces inside the pole group are aligned, whether There are damages, etc., so that unqualified pole groups such as misalignment or damage between the pole pieces are detected, and the unqualified pole groups are reworked or scrapped, and the qualified pole groups enter the next step.
  • the lithium-ion battery assembly process provided by this application includes helium inspection after performing peripheral welding on the periphery of the shell and the cover plate, and uses the helium inspection to perform short-circuit detection on the battery.
  • the batteries that pass the test are marked as Qualified batteries will be reworked or scrapped if they are unqualified, so as to screen out unqualified batteries with short circuit problems and improve battery safety.
  • the lithium-ion battery provided by this application is manufactured by using the above-mentioned lithium-ion battery assembly process. Compared with the traditional lithium-ion battery, the connecting piece in the structure is eliminated, the number of connecting parts is reduced, and the parts are reduced. The situation that the interconnection is unqualified, thus reducing the defective rate of lithium-ion batteries.
  • the lithium-ion battery provided by the application is configured with a first connection part and a second connection part on the cover plate, the first connection part is connected to the positive tab, and the second connection part is connected to the negative pole.
  • Ear connection to realize the connection between the cover plate and the pole group, and by setting the extension direction of the first connection part and the second connection part to be the same as the extension direction of the positive electrode ear and the negative electrode ear , and the extension direction of the first connection part and the second connection part is perpendicular to the plane where the cover plate is located, so that when the pole group is connected to the connection part of the cover plate through the tab, the The pole group is perpendicular to the plane where the cover plate is located, and is suitable for being directly loaded into the housing, with simple structure and convenient operation.
  • Figure 1 is a flow chart of the lithium-ion battery assembly process before improvement
  • Figure 2 is an assembly drawing of the improved front pole group and connecting piece
  • Fig. 3 is the top view of Fig. 2;
  • Figure 4 is an assembly drawing of the improved pole group and the cover plate
  • Figure 5 is a top view of Figure 4.
  • Figure 6 is a flow chart of the improved lithium-ion battery assembly process
  • Figure 7 is an assembly drawing of the improved pole group and the cover plate
  • Fig. 8 is a side view of direction A in Fig. 7 .
  • Pole group 1. Pole group; 11. Positive pole ear; 12. Negative pole ear; 2. Cover plate; 21. First connecting part; 22. Second connecting part; 3. Positive connecting piece; 31. First positive welding print; 32. The second positive electrode solder print; 4, the negative electrode connecting piece; 41, the first negative electrode solder print; 42, the second negative electrode solder print.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • the lithium-ion battery assembly process provided in this embodiment includes:
  • Peripheral welding is performed on the periphery where the casing and the cover plate 2 abut.
  • the number of pole groups 1 shown is at least two, preferably two.
  • this embodiment is applicable to prismatic batteries and lithium-ion batteries that are used in the welding and assembly process of connecting tabs in other traditional assembly processes.
  • the tabs of the pole group 1 include positive tabs and negative tabs
  • the pre-welding of the tabs of the pole group 1 refers to the positive tabs on the plurality of positive plates of the pole group 1. Welding is performed to integrate the positive tabs on the plurality of positive plates, and welding the negative tabs on the multiple negative plates of the pole group 1 is performed to integrate the negative tabs on the multiple negative plates; the pre-welding includes laser welding; the Paste glue on the welding mark where the tab and the cover plate 2 are welded to cover the welding mark, which is suitable for protecting the welding mark and placing the welding mark to oxidize; the outer side of the pole group 1 is covered with glue, which is suitable for preventing the pole group from being oxidized. The shell directly contacts and protects the pole group.
  • the traditional lithium-ion battery assembly process includes stacking, hot pressing, X-ray (X-ray) inspection, tab pre-welding and tab cutting, connecting piece welding, gluing, connecting Sheet and cover welding, gluing and core joining, gluing and shelling, peripheral welding, and helium inspection processes.
  • X-ray X-ray
  • the two shown pole groups 1 need to be connected to the connecting piece, the positive ear of the shown pole group 1 is connected to the positive connecting piece 3, and the negative ear of the shown pole group 1 is connected to the negative connecting piece 4, so
  • the connection method is welding, and a first positive electrode soldering mark 31 is formed at the connection between the positive electrode tab and the positive electrode connecting piece 3, and a first negative electrode welding mark 41 is formed at the connection between the negative electrode tab and the negative electrode connecting piece 4,
  • the extension direction of the connecting piece is the same as the extending direction of the tabs of the two pole groups 1, and then, the connecting piece is welded to the cover plate 2, and the plane where the cover plate is located is the same as the plane where the connecting piece is located.
  • connection between the positive connection piece 3 and the cover plate 2 forms a second positive welding mark 32
  • connection between the negative connection piece 4 and the cover plate 2 forms a second negative welding mark 42
  • the lithium-ion battery assembly process provided in this embodiment is completed by setting the procedures including making electrode group 1, pre-welding and cutting the tabs, welding the tabs and the cover plate, pasting glue, encapsulating and entering the case, and peripheral welding.
  • Lithium-ion battery assembly and compared with the traditional lithium-ion battery production process, this application directly welds the tabs and the cover plate, thereby canceling the welding step of the connecting piece in the traditional process, and avoiding the problems caused by the welding process of the connecting piece. unqualified products, thereby effectively reducing the production defect rate.
  • the process of directly welding the tabs to the cover plate 2 it is possible to directly fix the pole group 1 on a plane perpendicular to the plane where the cover plate 2 is located.
  • the making pole group 1 includes:
  • the assembly formed after lamination is hot-pressed to form the pole group 1 .
  • pole group 1 also includes:
  • the stacking according to a predetermined order includes cyclic stacking in the order of the negative electrode sheet, the separator, the positive electrode sheet, and the separator, and the number of cycles N ⁇ 1.
  • the lamination according to a predetermined order includes first placing a layer of separator, and then stacking in a cycle in the order of negative electrode sheet, separator, positive electrode sheet, and separator, the number of cycles N ⁇ 1, and finally stacking a layer of negative electrode Sequential stacking of sheets and a layer of separator.
  • the negative electrode sheet, separator, and positive electrode sheet are stacked in a predetermined order, and the assembly formed after lamination is hot-pressed, so that the separator and the negative electrode sheet, positive electrode sheet
  • the sheet fits better to avoid problems such as displacement between the diaphragm and the pole piece, and through X-ray detection of the hot-pressed pole set 1, it is possible to detect whether the pole pieces inside the pole set 1 are aligned, Whether there is damage, etc., so as to detect the unqualified pole group 1 such as misalignment or damage between the pole pieces, the unqualified pole group 1 will be reworked or scrapped, and the qualified pole group 1 will enter The next step.
  • the helium inspection includes short-circuit detection of peripheral welded batteries using helium inspection equipment.
  • the batteries that pass the inspection are marked as qualified batteries, and those that fail the inspection are reworked or scrapped.
  • the lithium-ion battery assembly process provided in this embodiment includes a helium test after performing peripheral welding on the periphery of the contact between the shell and the cover plate 2, and uses the helium test to perform short-circuit detection on the battery.
  • the batteries that pass the test are marked as Qualified batteries will be reworked or scrapped if they are unqualified, so as to screen out unqualified batteries with short circuit problems and improve battery safety.
  • this embodiment provides a lithium-ion battery, which is manufactured using the above-mentioned lithium-ion battery assembly process.
  • the lithium-ion battery provided in this embodiment is manufactured by using the above-mentioned lithium-ion battery assembly process. Compared with the traditional lithium-ion battery, the connecting piece in the structure is eliminated, the number of connecting parts is reduced, and the gap between the parts is reduced. Interconnections are unqualified, thus reducing the defective rate of lithium-ion batteries.
  • the lithium ion battery includes:
  • the pole group 1 is placed in the housing, and the pole group 1 is provided with a positive tab 11 and a negative tab 12;
  • the cover plate 2 is fixedly connected with the open end of the housing, and the side of the cover plate 2 facing the inside of the housing is fixedly connected with the tab of the pole group 1 .
  • connection method between the cover plate 2 and the housing is welding.
  • the housing is a cuboid housing.
  • the cover plate 2 is configured with a first connecting portion 21 and a second connecting portion 22, the first connecting portion 21 is suitable for connecting with the positive tab 11, and the second connecting portion 22 is suitable for connecting with the The negative tab 12 is connected.
  • first connecting portion 21 and the second connecting portion 22 are located on the side of the cover plate 2 facing the interior of the housing, and are away from a side of the housing interior through the cover plate 2 . side is connected to an external circuit.
  • the extension direction of the first connection portion 21 and the second connection portion 22 is the same as the extension direction of the positive tab 11 and the negative tab 12 of the pole group 1, and the first connection The extending direction of the portion 21 and the second connecting portion 22 is perpendicular to the plane where the cover plate 2 is located.
  • cover plate 2 is a plate-shaped structure, and the plane where the cover plate 2 is located refers to the plane where the plate surface of the plate-shaped structure is located.
  • the lithium ion battery provided in this embodiment is configured with a first connecting portion 21 and a second connecting portion 22 on the cover plate 2, the first connecting portion 21 is connected to the positive tab 11, and the second The connection part 22 is connected to the negative tab 12 to realize the connection between the cover plate 2 and the pole group 1, and by setting the extension direction of the first connection part 21 and the second connection part 22 to be consistent with the
  • the extension directions of the positive tab 11 and the negative tab 12 are the same, and the extension directions of the first connecting portion 21 and the second connecting portion 22 are perpendicular to the plane where the cover plate 2 is located, so that when the When the pole group 1 is connected to the connecting part of the cover plate 2 through the tab, the pole group 1 is perpendicular to the plane where the cover plate 2 is located, and is suitable for being directly loaded into the housing, with simple structure and convenient operation .
  • first connecting portion 21 is suitable for being connected to the positive tab 11 by welding
  • second connecting portion 22 is suitable for being connected to the negative tab 12 by welding.

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Abstract

本申请涉及锂离子电池技术领域，具体涉及一种锂离子电池装配工艺及锂离子电池。所述锂离子电池装配工艺包括：制作极组；对极组的极耳进行预焊，并对预焊后的极耳进行裁切；将裁切后的极耳与盖板焊接连接；在极耳与盖板焊接的焊印处贴胶，覆盖焊印；在极组外侧包胶，并将包胶后的极组装入壳体中，壳体的开口端与盖板配合抵接；将壳体与盖板相抵接的周边进行周边焊。本申请提供的锂离子电池装配工艺，通过取消传统装配工艺中的连接片焊接及合芯的步骤，有效提高了产品的合格率，减少了装配工序，从而提高了生产效率、降低了产品不良率，且减少了设备和能耗的投入，降低了生产成本。

Description

一种锂离子电池装配工艺及锂离子电池
本申请要求在2021年10月29日提交中国专利局、申请号为202111270669.9、发明名称为“一种锂离子电池装配工艺及锂离子电池”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
本申请涉及锂离子电池技术领域，具体涉及一种锂离子电池装配工艺及锂离子电池。
背景技术
随着新能源汽车行业的发展，对用于新能源汽车上的动力电池的要求越来越高，通过增加单个电芯容量的方法可以提高电池包的能量密度，对于方形锂离子电池，为避免增加单个电芯容量时电芯厚度和极片长度增大而导致包覆困难和加剧变形，行业内通常采用将铝壳内的单个电芯拆分成至少两个电芯装入铝壳的方法。现有技术中，方形锂离子电池生产过程中，装配过程的工序一般包括叠片、热压、X-ray(X射线)检测、极耳预焊、极耳裁切、连接片焊接、连接片与盖板焊接、入壳、周边焊等工序，整个装配过程，工序繁多，操作繁琐，生产效率低，产品不良率高。
发明内容
因此，本申请要解决的技术问题在于克服现有技术中锂离子电池装配过程工序繁多、操作繁琐的缺陷，从而提供一种减少装配过程工序、操作简单的锂离子电池装配工艺。
本申请要解决的另一个技术问题在于克服现有技术中锂离子电池产品不良率高的缺陷，从而提供一种产品不良率低的锂离子电池。
为解决上述技术问题，本申请提供的一种锂离子电池装配工艺，包括：
制作极组；
对极组的极耳进行预焊，并对预焊后的极耳进行裁切；
将裁切后的极耳与盖板焊接连接；
在极耳与盖板焊接的焊印处贴胶，覆盖焊印；
在极组外侧包胶，并将包胶后的极组装入壳体中，壳体的开口端与盖板配合抵接；
将壳体与盖板相抵接的周边进行周边焊。
可选的，所述制作极组包括：
将负极片、隔膜、正极片按照预定顺序进行叠片；
对叠片后形成的组件进行热压，形成极组。
可选的，所述制作极组还包括：
在对叠片后形成的组件进行热压，形成极组之后，对极组进行X-ray检测，检测合格的极组进入下一步工序，检测不合格的极组进行返工或报废。
可选的，所述按照预定顺序进行叠片包括按照负极片、隔膜、正极片、隔膜的顺序循环叠放，循环的次数N≥1。
可选的，所述将壳体与盖板相抵接的周边进行周边焊之后还包括：
氦检，所述氦检包括将周边焊后的电池采用氦检设备进行短路检测，检测合格的电池标记为合格电池，检测不合格的进行返工或报废。
本申请提供的锂离子电池，所述锂离子电池使用如上述所述的锂离子电池装配工艺制造而成。
可选的，所述锂离子电池包括：
壳体，所述壳体的一端开口；
极组，放置于所述壳体内，所述极组设置有正极耳和负极耳；
盖板，与所述壳体的开口端固定连接，所述盖板朝向所述壳体内部的一侧与所述极组的极耳固定连接。
可选的，所述盖板上构造有第一连接部和第二连接部，所述第一连接部适于与所述正极耳连接，所述第二连接部适于与所述负极耳连接。
可选的，所述第一连接部及所述第二连接部的延伸方向与所述极组的所述正极耳及所述负极耳的延伸方向相同，且所述第一连接部及所述第二连接部的延伸方向与所述盖板所在的平面相垂直。
可选的，所述第一连接部适于与所述正极耳的连接方式为焊接，所述第二连接部适于与所述负极耳的连接方式为焊接。
本申请技术方案，具有如下优点：
1.本申请提供的锂离子电池装配工艺，通过设置包括制作极组、极耳进行预焊并裁切、极耳与盖板焊接、贴胶、包胶及入壳、周边焊的工序，完成锂离子电池的装配，并且与传统的锂离子电池生产过程相比，本申请直接将极耳与盖板焊接，从而取消了传统工艺中的连接片焊接步骤，避免了因连接片焊接过程而产生的不合格产品，因而有效降低了生产不良率，另外，直接将极耳与盖板焊接的工序中，可以实现直接将所述极组固定在与所述盖板所在平面相垂直的方向，便于将所述极组装入壳体中，与传统的锂离子电池生产过程相比，减少了合芯的步骤，避免了合芯过程中因对极组进行翻转合并时极耳弯折而造成的极耳损坏，并减少了装配过程中对极组的翻转动作，从而减少对极组的损坏，有效提高了产品的合格率，通过取消连接片焊接及取消合芯的新装配方式，减少了装配工序，从而提高了生产效率、降低了生产不良率，且减少了设备和能耗的投入，降低了生产成本。
2.本申请提供的锂离子电池装配工艺，通过将负极片、隔膜、正极片按照预定顺序进行叠片，并对叠片后形成的组件进行热压，使得所述隔膜与所述负极片、正极片更贴合，避免隔膜与极片之间出现移位等问题，并通过对热压后的极组进行X-ray检测，实现探测所述极组内部的极片之间是否对齐、是否有损伤等，从而检测出极片之间未对齐或有损伤等不合格的极组，不合格的极组进行返工或报废，而检测合格的极组进入下一步工序。
3.本申请提供的锂离子电池装配工艺，通过设置所述将壳体与盖板相抵接的周边进行周边焊之后还包括氦检，采用氦检对电池进行短路检测，检测合格的电池标记为合格电池，检测不合格的进行返工或报废，从而筛选掉存在短路问题的不合格电池，提高电池的安全性。
4.本申请提供的锂离子电池，通过使用上述锂离子电池装配工艺制造而成，与传统的锂离子电池相比，取消了结构中的连接片，减少了连接部件的数量，从而降低了部件之间相互连接不合格的情况，因而降低了锂离子电池的不良率。
5.本申请提供的锂离子电池，通过设置盖板上构造有第一连接部和第二连接部，所述第一连接部与所述正极耳连接，所述第二连接部与所述负极耳连接，实现所述盖板与所述极组的连接，并且，通过设置所述第一连接部及所述第二连接部的延伸方向与所述正极耳及所述负极耳的延伸方向相同，且所述第一连接部及所述第二连接部的延伸方向与所述盖板所在的平面相垂 直，实现当所述极组通过极耳与所述盖板的连接部连接时，所述极组垂直于所述盖板所在的平面，适于直接装入所述壳体中，结构简单且操作方便。
附图说明
为了更清楚地说明本申请具体实施方式或现有技术中的技术方案，下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为改进前锂离子电池装配工艺的流程图；
图2为改进前极组与连接片的装配图；
图3为图2的俯视图；
图4为改进后极组与盖板的装配图；
图5为图4的俯视图；
图6为改进后锂离子电池装配工艺的流程图；
图7为改进后极组与盖板的装配图；
图8为图7中A方向的侧视图。
附图标记说明：
1、极组；11、正极耳；12、负极耳；2、盖板；21、第一连接部；22、第二连接部；3、正极连接片；31、第一正极焊印；32、第二正极焊印；4、负极连接片；41、第一负极焊印；42、第二负极焊印。
具体实施方式
下面将结合附图对本申请的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“垂直”、“水平”、“内”、“外”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”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；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。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
此外，下面所描述的本申请不同实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
实施例一
结合图1-图8所示，本实施例提供的锂离子电池装配工艺，包括：
制作极组1；
对极组1的极耳进行预焊，并对预焊后的极耳进行裁切；
将裁切后的极耳与盖板2焊接连接；
在极耳与盖板2焊接的焊印处贴胶，覆盖焊印；
在极组1外侧包胶，并将包胶后的极组1装入壳体中，壳体的开口端与盖板2配合抵接；
将壳体与盖板2相抵接的周边进行周边焊。
可选的，所示极组1的数量至少为2个，优选为2个。
需要说明的是，本实施例适用于方壳电池及其它传统装配工艺中用到连接片焊接装配工序的锂离子电池。
需要说明的是，所述极组1的极耳包括正极耳和负极耳，所述对极组1的极耳进行预焊指的是分别对所述极组1的多个正极片上的正极耳进行焊接使多个正极片上的正极耳形成一体，对所述极组1的多个负极片上的负极耳进行焊接使多个负极片上的负极耳形成一体；所述预焊包括激光焊；所述在极耳与盖板2焊接的焊印处贴胶，覆盖焊印，适于保护焊印，放置所述焊印处氧化；所述极组1外侧包胶，适于防止所述极组与所述壳体直接接触，保护所述极组。
结合图1-图5所示，传统的锂离子电池装配工艺包括叠片、热压、X-ray(X射线)检测、极耳预焊及极耳裁切、连接片焊接、贴胶、连接片与盖板 焊接、贴胶及合芯、包胶及入壳、周边焊、氦检工序。在装配过程中，需将两个所示极组1与连接片连接，所示极组1的正极耳与正极连接片3连接，所示极组1的负极耳与负极连接片4连接，所述连接方式为焊接，在所述正极耳与所述正极连接片3连接处形成第一正极焊印31，在所述负极耳与所述负极连接片4连接处形成第一负极焊印41，所述连接片的延伸方向与两个所述极组1的极耳的延伸方向相同，而后，将所述连接片与盖板2焊接，所述盖板所在平面与所述连接片所在平面相平行，所述正极连接片3与所述盖板2连接处形成第二正极焊印32，所述负极连接片4与所述盖板2连接处形成第二负极焊印42，而后，按照图3或图5所示的合芯方向进行合芯，弯折所述极组1的极耳，使得两个所示极组1各自翻折90°，以便于将所示极组装入壳体中，且所述盖板2能够与所述壳体的开口端相抵接，从而形成封闭的方形电池。
本实施例提供的锂离子电池装配工艺，通过设置包括制作极组1、极耳进行预焊并裁切、极耳与盖板焊接、贴胶、包胶及入壳、周边焊的工序，完成锂离子电池的装配，并且与传统的锂离子电池生产过程相比，本申请直接将极耳与盖板焊接，从而取消了传统工艺中的连接片焊接步骤，避免了因连接片焊接过程而产生的不合格产品，因而有效降低了生产不良率，另外，直接将极耳与盖板2焊接的工序中，可以实现直接将所述极组1固定在与所述盖板2所在平面相垂直的方向，便于将所述极组1装入壳体中，与传统的锂离子电池生产过程相比，减少了合芯的步骤，避免了合芯过程中因极耳弯折而造成的极耳损坏，有效提高了产品的合格率，通过取消连接片焊接及取消合芯的新装配方式，减少了装配工序，从而提高了生产效率、降低了生产不良率，且减少了设备和能耗的投入，降低了生产成本。
具体地，所述制作极组1包括：
将负极片、隔膜、正极片按照预定顺序进行叠片；
对叠片后形成的组件进行热压，形成极组1。
具体地，所述制作极组1还包括：
在对叠片后形成的组件进行热压，形成极组1之后，对极组1进行X-ray检测，检测合格的极组1进入下一步工序，检测不合格的极组1进行返工或报废。
具体地，所述按照预定顺序进行叠片包括按照负极片、隔膜、正极片、 隔膜的顺序循环叠放，循环的次数N≥1。
可选的，所述按照预定顺序进行叠片包括先放一层隔膜，然后按照负极片、隔膜、正极片、隔膜的顺序循环叠放，循环的次数N≥1，最后再叠放一层负极片、一层隔膜的顺序叠放。
本实施例提供的锂离子电池装配工艺，通过将负极片、隔膜、正极片按照预定顺序进行叠片，并对叠片后形成的组件进行热压，使得所述隔膜与所述负极片、正极片更贴合，避免隔膜与极片之间出现移位等问题，并通过对热压后的极组1进行X-ray检测，实现探测所述极组1内部的极片之间是否对齐、是否有损伤等，从而检测出极片之间未对齐或有损伤等不合格的所述极组1，不合格的所述极组1进行返工或报废，而检测合格的所述极组1进入下一步工序。
具体地，所述将壳体与盖板2相抵接的周边进行周边焊之后还包括：
氦检，所述氦检包括将周边焊后的电池采用氦检设备进行短路检测，检测合格的电池标记为合格电池，检测不合格的进行返工或报废。
本实施例提供的锂离子电池装配工艺，通过设置所述将壳体与盖板2相抵接的周边进行周边焊之后还包括氦检，采用氦检对电池进行短路检测，检测合格的电池标记为合格电池，检测不合格的进行返工或报废，从而筛选掉存在短路问题的不合格电池，提高电池的安全性。
实施例二
结合图6-图8所示，本实施例提供一种锂离子电池，所述锂离子电池使用如上述所述的锂离子电池装配工艺制造而成。
本实施例提供的锂离子电池，通过使用上述锂离子电池装配工艺制造而成，与传统的锂离子电池相比，取消了结构中的连接片，减少了连接部件的数量，从而降低了部件之间相互连接不合格的情况，因而降低了锂离子电池的不良率。
具体地，所述锂离子电池包括：
壳体，所述壳体的一端开口；
极组1，放置于所述壳体内，所述极组1设置有正极耳11和负极耳12；
盖板2，与所述壳体的开口端固定连接，所述盖板2朝向所述壳体内部的一侧与所述极组1的极耳固定连接。
可选的，所述盖板2与所述壳体的连接方式为焊接。
可选的，所述壳体为长方体壳体。
具体地，所述盖板2上构造有第一连接部21和第二连接部22，所述第一连接部21适于与所述正极耳11连接，所述第二连接部22适于与所述负极耳12连接。
可选的，所述第一连接部21与所述第二连接部22位于所述盖板2朝向所述壳体内部的一侧，并通过所述盖板2远离所述壳体内部的一侧与外部电路连接。
具体地，所述第一连接部21及所述第二连接部22的延伸方向与所述极组1的所述正极耳11及所述负极耳12的延伸方向相同，且所述第一连接部21及所述第二连接部22的延伸方向与所述盖板2所在的平面相垂直。
需要说明的是，所述盖板2为板状结构，所述盖板2所在的平面指的是所述板状结构的板面所在的平面。
本实施例提供的锂离子电池，通过设置所述盖板2上构造有第一连接部21和第二连接部22，所述第一连接部21与所述正极耳11连接，所述第二连接部22与所述负极耳12连接，实现所述盖板2与所述极组1的连接，并且，通过设置所述第一连接部21及所述第二连接部22的延伸方向与所述正极耳11及所述负极耳12的延伸方向相同，且所述第一连接部21及所述第二连接部22的延伸方向与所述盖板2所在的平面相垂直，实现当所述极组1通过极耳与所述盖板2的连接部连接时，所述极组1垂直于所述盖板2所在的平面，适于直接装入所述壳体中，结构简单且操作方便。
具体地，所述第一连接部21适于与所述正极耳11的连接方式为焊接，所述第二连接部22适于与所述负极耳12的连接方式为焊接。
显然，上述实施例仅仅是为清楚地说明所作的举例，而并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引伸出的显而易见的变化或变动仍处于本申请的保护范围之中。

Claims (10)

  1. 一种锂离子电池装配工艺，其特征在于，包括：
    制作极组；
    对所述极组的极耳进行预焊，并对预焊后的极耳进行裁切；
    将裁切后的极耳与盖板焊接连接；
    在所述极耳与所述盖板焊接的焊印处贴胶，覆盖所述焊印；
    在所述极组外侧包胶，并将包胶后的所述极组装入壳体中，所述壳体的开口端与所述盖板配合抵接；
    将所述壳体与所述盖板相抵接的周边进行周边焊。
  2. 根据权利要求1所述的锂离子电池装配工艺，其特征在于，所述制作极组包括：
    将负极片、隔膜、正极片按照预定顺序进行叠片；
    对叠片后形成的组件进行热压，形成所述极组。
  3. 根据权利要求2所述的锂离子电池装配工艺，其特征在于，所述制作极组还包括：
    在所述对叠片后形成的组件进行热压，形成所述极组之后，对所述极组进行X-ray检测，检测合格的极组进入下一步工序，检测不合格的极组进行返工或报废。
  4. 根据权利要求2所述的锂离子电池装配工艺，其特征在于，所述按照预定顺序进行叠片包括按照所述负极片、所述隔膜、所述正极片、所述隔膜的顺序循环叠放，循环的次数N≥1。
  5. 根据权利要求1-4任意一项所述的锂离子电池装配工艺，其特征在于，所述将所述壳体与所述盖板相抵接的周边进行周边焊之后还包括：
    氦检，所述氦检包括将周边焊后的电池采用氦检设备进行短路检测，检测合格的电池标记为合格电池，检测不合格的进行返工或报废。
  6. 一种锂离子电池，其特征在于，所述锂离子电池使用如上述权利要求1-5任意一项所述的锂离子电池装配工艺制造而成。
  7. 根据权利要求6所述的锂离子电池，其特征在于，包括：
    壳体，所述壳体的一端开口；
    极组，放置于所述壳体内，所述极组设置有正极耳和负极耳；
    盖板，与所述壳体的开口端固定连接，所述盖板朝向所述壳体内部的一 侧与所述极组的极耳固定连接。
  8. 根据权利要求7所述的锂离子电池，其特征在于，所述盖板上构造有第一连接部和第二连接部，所述第一连接部适于与所述正极耳连接，所述第二连接部适于与所述负极耳连接。
  9. 根据权利要求8所述的锂离子电池，其特征在于，所述第一连接部及所述第二连接部的延伸方向与所述极组的所述正极耳及所述负极耳的延伸方向相同，且所述第一连接部及所述第二连接部的延伸方向与所述盖板所在的平面相垂直。
  10. 根据权利要求8所述的锂离子电池，其特征在于，所述第一连接部适于与所述正极耳的连接方式为焊接，所述第二连接部适于与所述负极耳的连接方式为焊接。
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