WO2023198220A1 - 动力电池盖板及动力电池 - Google Patents

动力电池盖板及动力电池 Download PDF

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Publication number
WO2023198220A1
WO2023198220A1 PCT/CN2023/091828 CN2023091828W WO2023198220A1 WO 2023198220 A1 WO2023198220 A1 WO 2023198220A1 CN 2023091828 W CN2023091828 W CN 2023091828W WO 2023198220 A1 WO2023198220 A1 WO 2023198220A1
Authority
WO
WIPO (PCT)
Prior art keywords
power battery
post
lead
bottom plate
cover body
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/CN2023/091828
Other languages
English (en)
French (fr)
Inventor
边颖
潘福中
王聪
牛亚琪
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.)
Zhejiang Geely Holding Group Co Ltd
Zhejiang Zeekr Intelligent Technology Co Ltd
Viridi eMobility Technology Ningbo Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Zhejiang Zeekr Intelligent Technology Co Ltd
Viridi eMobility Technology Ningbo 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 Zhejiang Geely Holding Group Co Ltd, Zhejiang Zeekr Intelligent Technology Co Ltd, Viridi eMobility Technology Ningbo Co Ltd filed Critical Zhejiang Geely Holding Group Co Ltd
Publication of WO2023198220A1 publication Critical patent/WO2023198220A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside 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
    • H01M50/543—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

Definitions

  • the present application relates to the technical field of power batteries, and in particular, to a power battery cover and a power battery.
  • power battery covers generally adopt riveted or injection molded structures.
  • the external poles are connected to the inner lead-out piece inside the battery core.
  • the battery cell tabs are laser welded to the inner lead-out piece through the transition piece, thereby achieving the connection between the tabs and poles. connect.
  • the connection between the cell tabs and the inner lead-out piece requires two welding processes, which increases the risk of instability.
  • the weld position generally has high resistance, and the battery generates a lot of heat when charging and discharging with high current; on the other hand, , the inner lead-out piece needs to be laser welded.
  • the inner lead-out piece In order to prevent it from being welded through, the inner lead-out piece is generally thicker and takes up space in the battery. At the same time, the energy during laser welding is high, and it is easy to cause problems such as explosions and spatters during operation, and metal shavings are generated. , causing battery safety hazards; in addition, protective gas must be used when laser welding negative copper tabs, because copper is easily oxidized, which can easily cause some copper ions to enter the electrolyte and affect battery performance.
  • the main purpose of this application is to propose a power battery cover and a power battery, aiming to solve the problem in the prior art that the connection between the cell tabs and the inner lead-out piece requires two welding processes, which increases the risk of instability.
  • a power battery cover which includes:
  • At least one set of electrode assemblies includes an electrode post, a connecting piece and a lead-out piece.
  • the electrode post is arranged on the outside of the cover body.
  • the connector is connected to the electrode post and the cover body.
  • the lead-out piece The piece is located inside the cover body, and one end is connected to the connecting piece, and the other end is used to connect to the cell of the power battery;
  • connecting piece and the lead-out piece are integrally formed.
  • the cover body is provided with mounting holes
  • the connector includes a bottom plate and a connecting post protruding from one side of the bottom plate.
  • the bottom plate is pressed against the inside of the cover body.
  • the connecting post passes through the mounting hole and is connected to the electrode post.
  • the electrode post is fixed to the cover body, and the bottom plate is connected to the lead-out piece.
  • one end of the bottom plate is bent in a direction away from the connecting column to form a bending portion, the bending portion constitutes the lead-out piece, and the thickness of the bottom plate is greater than the thickness of the lead-out piece.
  • the electrode assembly is configured as a positive electrode assembly, and the thickness of the bottom plate in the positive electrode assembly is H1, 0.5mm ⁇ H1 ⁇ 2mm;
  • the thickness of the lead-out member in the positive electrode assembly is H2, 0.5mm ⁇ H2 ⁇ 1mm.
  • the electrode assembly is configured as a negative electrode assembly, and the thickness of the bottom plate in the negative electrode assembly is H3, 0.5mm ⁇ H3 ⁇ 1.5mm; the lead-out member in the negative electrode assembly The thickness is H4, 0.3mm ⁇ H4 ⁇ 1mm.
  • the power battery cover further includes a first insulating seal located between the electrode post and the cover body, so that the electrode post and the cover body are The outer side of the cover body is insulated; and/or,
  • the power battery cover also includes a second insulating sealing member that is sleeved on the outer periphery of the connecting post to insulate the connecting post from the side wall of the mounting hole.
  • the power battery cover further includes a third insulating seal, and the third insulating seal is provided between the bottom plate and the inside of the cover body, so that the bottom plate and the The inner side of the cover body is insulated.
  • the thickness of the third insulating sealing member is H5, 0.3mm ⁇ H5 ⁇ 1mm.
  • this application also provides a power battery, which includes the power battery cover described in the above technical solution.
  • the power battery includes at least one power battery cover; and/or,
  • the power battery cover is provided with at least two sets of electrode assemblies, and one of the two electrode assemblies in each power battery cover is a positive electrode assembly and the other is a negative electrode assembly.
  • the power battery cover includes a cover body and at least one set of electrode assemblies.
  • the electrode assembly includes electrode posts, connectors and lead-out parts.
  • the electrode posts are provided on the cover body.
  • the connecting piece is connected to the electrode post and the cover body, and is used to fix the electrode post on the cover body.
  • the lead-out piece is located inside the cover body, and one end is connected to the cover body.
  • the connecting piece is connected, and the other end is used to connect to the battery core of the power battery.
  • the lead-out piece is used to electrically connect the electrode column to the power battery, and the connecting piece and the lead-out piece are integrally formed.
  • Such an arrangement can simplify the structure of the connecting parts connecting the electrode post and the power battery, and reduce the cost of the connecting parts; at the same time, since the connecting part and the lead-out part are integrally formed, the connection between the electrode post and the power battery is simplified.
  • the welding process further improves the overcurrent capacity of the power battery, reduces the impedance of the power battery, and improves battery safety.
  • Figure 1 is a three-dimensional schematic diagram of an embodiment of the power battery cover of the present application.
  • Figure 2 is a schematic three-dimensional view of the power battery cover in Figure 1 from another perspective;
  • Figure 3 is a cross-sectional view of the power battery cover in Figure 1;
  • Figure 4 is a partial schematic diagram of the power battery cover in Figure 3;
  • Figure 5 is a cross-sectional view of the power battery cover in Figure 3 from another perspective;
  • FIG. 6 is a perspective view of the connecting piece and the lead-out piece in FIG. 3 .
  • power battery covers generally adopt riveted or injection molded structures.
  • the external poles are connected to the inner lead-out piece inside the battery core.
  • the battery cell tabs are laser welded to the inner lead-out piece through the transition piece, thereby achieving the connection between the tabs and poles. connect.
  • the connection between the cell tabs and the inner lead-out piece requires two welding processes, which increases the risk of instability.
  • the weld position generally has high resistance, and the battery generates a lot of heat when charging and discharging at high currents; on the other hand,
  • the inner lead-out piece needs to be laser welded.
  • the inner lead-out piece In order to prevent it from being welded through, the inner lead-out piece is generally thicker and takes up space in the battery. At the same time, the energy of laser welding is high, and it is easy to cause explosions, spatters and other problems during operation, resulting in the production of metal. shavings, causing battery safety hazards; in addition, protective gas must be used when laser welding negative copper tabs, because copper is easily oxidized, which can easily cause some copper ions to enter the electrolyte and affect battery performance.
  • this application provides a power battery cover, which is intended to solve the problem in the prior art that the connection between the cell tabs and the inner lead-out piece requires two welding processes, which increases the risk of instability.
  • Figures 1 to 6 are as follows This application provides an embodiment of a power battery cover.
  • the power battery cover includes a cover body 1 and at least one set of electrode assemblies.
  • the electrode assemblies include electrode posts 21, connectors 22 and lead-out parts 23.
  • the electrode posts 21 are located on On the outside of the cover body 1, the connecting piece 22 is connected to the electrode post 21 and the cover body 1.
  • the lead-out piece 23 is located inside the cover body 1 and has one end connected to the connecting piece. 22 is connected, and the other end is used to connect with the cell of the power battery; wherein, the connecting piece 22 and the lead-out piece 23 are integrally formed.
  • the electrode post 21 is provided on the outside of the cover body 1 , and the connector 22 is connected to the electrode post 21 and the cover body 1 for connecting the electrode post 21 to the cover body 1 .
  • 21 is fixedly installed on the cover body 1.
  • the lead-out piece 23 is located inside the cover body 1, and one end is connected to the connector 22, and the other end is used to connect to the cell of the power battery.
  • the component 23 is used to electrically connect the electrode post 21 to the power battery, and the connecting component 22 and the lead-out component 23 are integrally formed. This arrangement can simplify the connection between the electrode post 21 and the power battery.
  • the structure of the components reduces the cost of connecting components; at the same time, because the connecting piece 22 and the lead-out piece 23 are integrally formed, the welding process of connecting the electrode post 21 and the power battery is simplified, further improving the overcurrent capacity of the power battery and reducing the Power battery impedance to improve battery safety.
  • the number of electrode assemblies provided on the cover body 1 is not limited, and may be one group or two groups.
  • the electrode assembly may be a positive electrode.
  • the assembly can also be a negative electrode assembly.
  • the specific settings can be configured according to actual usage conditions.
  • the two electrode assemblies are spaced apart on the cover body 1, and the two electrode assemblies are spaced apart from each other.
  • the electrode assemblies are insulated from each other, and one of the two electrode assemblies is a positive electrode assembly and the other is a negative electrode assembly.
  • the cover body 1 is provided with mounting holes. 11;
  • the connector 22 includes a bottom plate 222 and a connecting post 221 protruding from one side of the bottom plate 222.
  • the bottom plate 222 is pressed against the inside of the cover body 1, and the connecting post 221 passes through the
  • the mounting hole 11 is connected to the electrode post 21 to fix the electrode post 21 to the cover body 1 , and the bottom plate 222 is connected to the lead-out member 23 .
  • the electrode post 21 is disposed corresponding to the mounting hole 11 and is covered with the mounting hole 11 .
  • the cross-sectional size of the mounting hole 11 is smaller than the cross-sectional size of the electrode post 21
  • the The cross-sectional size of the bottom plate 222 is smaller than the cross-sectional size of the mounting hole 11.
  • the connecting post 221 is located in the mounting hole 11 and is connected to the electrode post 21, so that the electrode post 21 is pressed inwardly against the cover.
  • the outer side of the plate main body 1 and the bottom plate 222 are pressed outward against the inner side of the cover plate main body 1 to fix the motor column and the bottom plate 222 on the cover plate main body 1.
  • connection method between the connecting post 221 and the electrode post 21 is not limited here.
  • the electrode post 21 corresponds to the mounting hole 11 and passes through it.
  • the connecting column 221 includes a first connecting section 2211 and a second connecting section 2212 that are sequentially connected in a direction away from the bottom plate 222.
  • the end surface of the second connecting section 2212 is provided with a rivet hole.
  • the cross-sectional size of the second connecting section 2212 is smaller than the cross-sectional size of the first connecting section 2211, the first connecting section 2211 is adapted to the mounting hole 11, and the second connecting section 2212 is adapted to the through hole.
  • a stepped surface is formed at the connection between the first connecting section 2211 and the second connecting section 2212.
  • the electrode post 21 is passed through the second connecting section 2212 and faces the cover body 1 One side is in contact with the step surface, and the second connecting section 2212 is riveted to the electrode post 21, thereby fixing the electrode post 21 to the cover body 1.
  • first remove the The connecting post 221 passes through the mounting hole 11 from the inside of the cover body 1, so that the second connecting section 2212 extends out of the mounting hole 11 and is located outside the cover body 1.
  • the bottom plate 222 abuts the inner side of the cover body 1 , and then the through hole on the electrode post 21 corresponds to the second connecting section 2212 , so that the electrode post 21 is sleeved on the second connecting section 2212 through the through hole.
  • the outer periphery of the connecting section 2212 is finally riveted to the second connecting section 2212 and the electrode column 21 through a riveting mechanism, so that the electrode column 21 and the second connecting section 2212 are fixed, and after riveting, the electrode
  • the column 21 and the bottom plate 222 are clamped on both sides of the cover body 1 to fix the electrode column 21 and the connector 22 on the cover body 1 at the same time.
  • the end surface of the connecting post 221 is provided with a threaded hole
  • the electrode post 21 is provided with a connecting hole corresponding to the threaded hole.
  • the electrode assembly includes a connecting screw, and the connecting screw passes through all the threaded holes.
  • the connecting hole is threadedly connected to the connecting post 221 to fix the electrode post 21 on the cover body 1 .
  • the specific forms of the lead-out member 23 and the bottom plate 222 are not limited.
  • one end of the bottom plate 222 is bent in a direction away from the connecting column 221 to form a bending portion.
  • the bent portion constitutes the lead-out piece 23
  • the thickness of the bottom plate 222 is greater than the thickness of the lead-out piece 23 .
  • the connecting member 22 and the lead-out member 23 in the positive electrode assembly are made of aluminum or aluminum alloy
  • the connecting member 22 and the lead-out member 23 are made of aluminum or aluminum alloy.
  • the lead-out piece 23 may be integrally formed by one-piece casting, or may be made by molecular diffusion welding of multi-layer aluminum alloy foils, or may be made by an upsetting process.
  • the connecting member 22 and the lead-out member 23 in the negative electrode assembly are both made of copper or the connecting post 221 is made of aluminum or aluminum. alloy, the bottom plate 222 and the lead-out piece 23 are made of copper, wherein the connecting post 221 and the bottom plate 222 are made by friction welding, and the lead-out part is made of multi-layer copper foil and molecular diffusion welding.
  • the connecting member 22 and the lead-out member 23 may be integrally formed by casting, or may be formed by molecular diffusion welding of multiple layers of copper foil.
  • the function of the bottom plate 222 is to compress the insulating seal to ensure the sealing performance of the insulating seal; on the other hand, it is to ensure that there is a gap between the electrode post 21 and the cover plate body 1 through the connecting post 221 A certain riveting force makes it have a certain mechanical strength and will not deform; the function of the lead-out piece 23 is to connect the tabs of the power battery.
  • the thickness of the lead-out piece 23 is thin.
  • the tabs can be It is ultrasonically welded to the lead-out piece 23.
  • the lead-out piece 23 can be bent to leave space for the pole core.
  • the thickness of the bottom plate 222 in the positive electrode assembly is H1, 0.5mm ⁇ H1 ⁇ 2mm; the thickness of the lead-out member 23 in the positive electrode assembly is H2, 0.5mm ⁇ H2 ⁇ 1mm.
  • the thickness of the bottom plate 222 in the negative electrode assembly is H3, 0.5mm ⁇ H3 ⁇ 1.5mm; the thickness of the lead-out member 23 in the negative electrode assembly is H4, 0.3mm ⁇ H4 ⁇ 1mm.
  • the power battery cover further includes a first insulating seal 3 located between the electrode post 21 and the cover body 1 so that the electrode post 21 and The outer surface of the cover body 1 is insulated.
  • a flange is formed on the peripheral side of the first insulating sealing member 3 extending in a direction away from the cover body 1 , and the flange covers the circumference of the electrode column 21 . And the height of the flange is smaller than the height of the electrode post 21 .
  • the power battery cover further includes a second insulating seal 4 that is sleeved on the outer periphery of the connecting post 221 so that the connecting post 221 is in contact with the mounting hole 11 side wall insulation.
  • the power battery cover further includes a third insulating seal 5 , which is provided between the bottom plate 222 and the inside of the cover body 1 , so that the bottom plate 222 and The inner surface of the cover body 1 is insulated.
  • ultrasonic welding is used instead of laser welding to connect the tabs to the inner lead-out piece, which reduces the energy of the welding process and the heat generated by the structural parts. Therefore, the insulating plastic parts between the bottom plate 222 and the cover body 1 can be To be thin, that is, the thickness of the third insulating seal 5 is H5, 0.3mm ⁇ H5 ⁇ 1mm. This setting can not only meet the insulation withstand voltage requirements, but also leave more space for the pole core to increase the battery capacity.
  • the materials of the first insulating seal 3 , the second insulating seal 4 and the third insulating seal 5 are not limited and may be PPS or PC.
  • first insulating sealing member 3 and the second insulating sealing member 4 are integrally formed.
  • second insulating sealing member 4 and the third insulating sealing member 5 are integrally formed.
  • this application also provides a power battery, which includes the power battery cover described in the above technical solution.
  • the detailed structure of the power battery cover of the power battery can refer to the above embodiment of the power battery cover, and will not be described again here; since the above power battery cover is used in the power battery of the present application, Therefore, the embodiments of the power battery of the present application include all the technical solutions of all the embodiments of the power battery cover mentioned above, and the technical effects achieved are exactly the same, and will not be described again here.
  • the power battery includes at least one power battery cover; and/or, the power battery cover is provided with at least two sets of electrode assemblies, and two of each power battery cover One of the electrode assemblies is a positive electrode assembly, and the other is a negative electrode assembly. That is, in one embodiment, when the cell tabs of the power battery are drawn out from the same end, the power battery includes one power battery cover, and the power battery cover is provided with two sets of electrode assemblies, two of which are One of the electrode assemblies is a positive electrode assembly and the other is a negative electrode assembly. In another embodiment, when the cell tabs of the power battery are drawn out from opposite ends, the power battery includes two power battery covers, and the two power battery covers are disposed on opposite sides of the battery cell. On both sides, each power battery cover is provided with a set of electrode assemblies. One of the two sets of electrode assemblies is a positive electrode assembly and the other is a negative electrode assembly.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了一种动力电池盖板及动力电池，包括盖板主体和至少一组电极组件，所述电极组件包括电极柱、连接件和引出件，所述电极柱设于所述盖板主体的外侧，所述连接件与所述电极柱和所述盖板主体连接，所述引出件位于所述盖板主体内侧，且一端与所述连接件连接，另一端用于与动力电池的电芯连接；其中，所述连接件和所述引出件一体成型设置。

Description

动力电池盖板及动力电池
本申请要求于2022年4月12号申请的、申请号为202210382700.6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
本申请涉及动力电池技术领域，尤其涉及一种动力电池盖板及动力电池。
 背景技术
目前动力电池盖板一般采用铆接或注塑结构，两种结构外部极柱与电芯内部的内引出片连接，电芯极耳通过过渡片激光焊接到内引出片上，从而实现极耳与极柱的连接。如此设置一方面，电芯极耳与内引出片连接经过了两道焊接工艺，增加了不稳定风险，同时，焊缝位置一般电阻较高，电池大电流充放电时发热量大；另一方面，内引出片需要进行激光焊接，为了防止被焊穿，内引出片一般比较厚，占用电池的空间；同时激光焊接时的能量高，操作时极易出现炸火、飞溅等问题，产生金属屑，造成电池安全隐患；此外激光焊接负极铜极耳时，必须有保护气，因为铜极易氧化，易使部分铜离子进入电解液影响电池性能。
 技术问题
本申请的主要目的是提出一种动力电池盖板及动力电池，旨在解决现有技术中电芯极耳与内引出片连接经过了两道焊接工艺，增加了不稳定风险的问题。
 技术解决方案
为实现上述目的，本申请提出一种动力电池盖板，所述动力电池盖板包括：
盖板主体；以及，
至少一组电极组件，包括电极柱、连接件和引出件，所述电极柱设于所述盖板主体的外侧，所述连接件与所述电极柱和所述盖板主体连接，所述引出件位于所述盖板主体内侧，且一端与所述连接件连接，另一端用于与动力电池的电芯连接；
其中，所述连接件和所述引出件一体成型设置。
在一实施方式中，所述盖板主体贯设有安装孔；
所述连接件包括底板和自所述底板一侧凸设的连接柱，所述底板抵紧于所述盖板主体的内侧，所述连接柱穿过所述安装孔与所述电极柱连接，以将所述电极柱固定于所述盖板主体，所述底板与所述引出件连接。
在一实施方式中，所述底板的一端朝向远离所述连接柱的方向折弯形成有折弯部，所述折弯部构成所述引出件，所述底板的厚度大于所述引出件的厚度。
在一实施方式中，所述电极组件设置为正电极组件，所述正电极组件中的所述底板的厚度为H1，0.5mm≤H1≤2mm；
所述正电极组件中的所述引出件的厚度为H2，0.5mm≤H2≤1mm。
在一实施方式中，所述电极组件设置为负电极组件，所述负电极组件中的所述底板的厚度为H3，0.5mm≤H3≤1.5mm；所述负电极组件中的所述引出件的厚度为H4，0.3mm≤H4≤1mm。
在一实施方式中，所述动力电池盖板还包括第一绝缘密封件，所述第一绝缘密封件位于所述电极柱与所述盖板主体之间，以使得所述电极柱与所述盖板主体的外侧面绝缘；和/或，
所述动力电池盖板还包括第二绝缘密封件，所述第二绝缘密封件套设于所述连接柱的外周，以使得所述连接柱与所述安装孔的侧壁绝缘。
在一实施方式中，所述动力电池盖板还包括第三绝缘密封件，所述第三绝缘密封件设于所述底板和所述盖板主体内侧之间，以使得所述底板与所述盖板主体的内侧面绝缘。
在一实施方式中，所述第三绝缘密封件的厚度为H5，0.3mm≤H5≤1mm。
此外本申请还提供一种动力电池，所述动力电池包括上述技术方案所述的动力电池盖板。
在一实施方式中，所述动力电池包括至少一个所述动力电池盖板；和/或，
所述动力电池盖板设有至少两组所述电极组件，且每一所述动力电池盖板中的两个所述电极组件其中之一为正电极组件，其中另一为负电极组件。
 有益效果
本申请的技术方案中，所述动力电池盖板包括盖板主体和至少一组电极组件，所述电极组件包括电极柱、连接件和引出件，所述电极柱设于所述盖板主体的外侧，所述连接件与所述电极柱和所述盖板主体连接，用于将所述电极柱固定安装在所述盖板主体，所述引出件位于所述盖板主体内侧，且一端与所述连接件连接，另一端用于与动力电池的电芯连接，所述引出件同于将所述电极柱与动力电池电性连接，并且所述连接件和所述引出件一体成型设置，如此设置可简化连接所述电极柱和所述动力电池的连接部件的结构，降低连接部件的成本；同时由于所述连接件和所述引出件一体成型简化了电极柱和动力电池之间连接的焊接工序，进一步提高了动力电池过流能力，降低动力电池阻抗，提高电池安全性。
 附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例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，下面描述中的附图仅仅是本申请的一些实施例，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示出的结构获得其他的附图。
图1为本申请的动力电池盖板一实施例的立体示意图；
图2为图1中动力电池盖板另一视角的立体示意图；
图3为图1中动力电池盖板的剖视图；
图4为图3中动力电池盖板的局部示意图；
图5为图3中动力电池盖板另一视角的剖视图；
图6为图3中连接件和引出件的立体示意图。
附图标号说明：
标号 名称 标号 名称
1 盖板主体 2212 第二连接段
11 安装孔 222 底板
21 电极柱 23 引出件
22 连接件 3 第一绝缘密封件
221 连接柱 4 第二绝缘密封件
2211 第一连接段 5 第三绝缘密封件
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，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作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。
需要说明，若本申请实施例中有涉及方向性指示（诸如上、下、左、右、前、后……），则该方向性指示仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，全文中出现的“和/或”的含义，包括三个并列的方案，以“A和/或B”为例，包括A方案、或B方案、或A和B同时满足的方案。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
目前动力电池盖板一般采用铆接或注塑结构，两种结构外部极柱与电芯内部的内引出片连接，电芯极耳通过过渡片激光焊接到内引出片上，从而实现极耳与极柱的连接。如此设置一方面，电芯极耳与内引出片连接经过了两道焊接工艺，增加了不稳定风险，同时，焊缝位置一般电阻较高，电池在大电流充放电时发热量大；另一方面，内引出片需要进行激光焊接，为了防止被焊穿，内引出片一般比较厚，占用电池的空间；同时激光焊接时的能量高，操作时极易出现炸火、飞溅等问题，产生金属屑，造成电池安全隐患；此外激光焊接负极铜极耳时，必须有保护气，因为铜极易氧化，易使部分铜离子进入电解液影响电池性能。
鉴于此，本申请提供一种动力电池盖板，旨在解决现有技术中电芯极耳与内引出片连接经过了两道焊接工艺，增加了不稳定风险的问题，图1至图6为本申请提供的动力电池盖板一实施例。
请参照图1至图2，所述动力电池盖板包括盖板主体1和至少一组电极组件，所述电极组件包括电极柱21、连接件22和引出件23，所述电极柱21设于所述盖板主体1的外侧，所述连接件22与所述电极柱21和所述盖板主体1连接，所述引出件23位于所述盖板主体1内侧，且一端与所述连接件22连接，另一端用于与动力电池的电芯连接；其中，所述连接件22和所述引出件23一体成型设置。
本申请的技术方案中，所述电极柱21设于所述盖板主体1的外侧，所述连接件22与所述电极柱21和所述盖板主体1连接，用于将所述电极柱21固定安装在所述盖板主体1，所述引出件23位于所述盖板主体1内侧，且一端与所述连接件22连接，另一端用于与动力电池的电芯连接，所述引出件23用于将所述电极柱21与动力电池电性连接，并且所述连接件22和所述引出件23一体成型设置，如此设置可简化连接所述电极柱21和所述动力电池的连接部件的结构，降低连接部件的成本；同时由于所述连接件22和所述引出件23一体成型简化了电极柱21和动力电池之间连接的焊接工序，进一步提高了动力电池过流能力，降低动力电池阻抗，提高电池安全性。
需要说明的是，设于所述盖板主体1的所述电极组件数量不做限制，可以是一组，也可以是两组，当设置为一组电极组件时，所述电极组件可以是正电极组件，也可以是负电极组件，具体设置可根据实际使用情况进行配置，当设置为两组所述电极组件时，两个所述电极组件间隔设置在所述盖板主体1上，两个所述电极组件相互绝缘，两个所述电极组件中一个为正电极组件，另一个为负电极组件。
具体地，所述电极柱21安装于所述盖板主体1外侧的具体安装方式不做限制，在本实施例中，请参照图3至图5，所述盖板主体1贯设有安装孔11；所述连接件22包括底板222和自所述底板222一侧凸设的连接柱221，所述底板222抵紧于所述盖板主体1的内侧，所述连接柱221穿过所述安装孔11与所述电极柱21连接，以将所述电极柱21固定于所述盖板主体1，所述底板222与所述引出件23连接。更为具体地，所述电极柱21对应所述安装孔11设置，且盖设在所述安装孔11处，所述安装孔11的截面尺寸小于所述电极柱21的截面尺寸，并且所述底板222的截面尺寸小于所述安装孔11的截面尺寸，所述连接柱221位于所述安装孔11内，与所述电极柱21连接，使得所述电极柱21向内抵紧于所述盖板主体1的外侧和所述底板222向外抵紧于所述盖板主体1的内侧，以将所述电机柱和所述底板222固定夹持于所述盖板主体1上，如此设置，所述电极柱21固定牢靠，不易松脱。
具体地，请参照图3至图6，所述连接柱221与所述电极柱21的连接方式在此不做限制，在本实施例中，所述电极柱21对应所述安装孔11处贯设有通孔，所述连接柱221包括沿远离所述底板222方向依次连接设置的第一连接段2211和第二连接段2212，所述第二连接段2212的端面设有铆钉孔，所述第二连接段2212的截面尺寸小于所述第一连接段2211的截面尺寸，所述第一连接段2211与所述安装孔11相适配，所述第二连接段2212与所述通孔相适配，并且所述第一连接段2211和所述第二连接段2212的连接处形成有台阶面，所述电极柱21穿设于所述第二连接段2212，且朝向所述盖板主体1的一侧与所述台阶面相抵接，所述第二连接段2212与所述电极柱21铆接，从而将所述电极柱21固定在所述盖板主体1上，具体安装时，首先将所述连接柱221自所述盖板主体1的内侧穿过所述安装孔11，使得所述第二连接段2212伸出所述安装孔11，位于所述盖板主体1的外侧，此时所述底板222与所述盖板主体1的内侧抵接，随后所述电极柱21上的通孔对应所述第二连接段2212，以通过通孔将所述电极柱21套接在所述第二连接段2212的外周，最后通过铆接机构将所述第二连接段2212与所述电极柱21铆接，使得所述电极柱21与所述第二连接段2212固定，并且在铆接后，所述电极柱21和所述底板222夹持在所述盖板主体1的两侧，以将所述电极柱21和所述连接件22同时固定在所述盖板主体1上。
在另一实施例中，所述连接柱221的端面设有螺纹孔，所述电极柱21对应所述螺纹孔贯设有连接孔，所述电极组件包括连接螺钉，所述连接螺钉穿过所述连接孔与所述连接柱221螺纹连接，以将所述电极柱21固定在所述盖板主体1上。
具体地，所述引出件23和所述底板222的具体形式不做限制，在本实施例中，所述底板222的一端朝向远离所述连接柱221的方向折弯形成有折弯部，所述折弯部构成所述引出件23，所述底板222的厚度大于所述引出件23的厚度。
具体地，当所述电极组件设置为正电极组件时，所述正电极组件中的所述连接件22和所述引出件23的材质为铝或者铝合金，并且所述连接件22和所述引出件23一体成型的方式可以是一体铸造成型，也可以是采用多层铝合金箔经过分子扩散焊接而成，还可以是采用镦薄工艺制成。
具体地，当所述电极组件设置为负电极组件时，所述负电极组件中的所述连接件22和所述引出件23的材质均为铜或者所述连接柱221的材质为铝或者铝合金，所述底板222和所述引出件23的材质为铜，其中，所述连接柱221和所述底板222采用摩擦焊加工制成，所述引出将则采用多层铜箔利用分子扩散焊接制成，并且所述连接件22和所述引出件23一体成型的方式可以是一体铸造成型，也可以是采用多层铜箔经过分子扩散焊接而成。
所述底板222的作用一方面是用于压缩绝缘密封件，保证绝缘密封件的密封性，另一方面是通过所述连接柱221使所述电极柱21与所述盖板主体1之间具有一定的拉铆力，使其具有一定的机械强度，不会发生形变；所述引出件23的作用是连接动力电池的极耳，所述引出件23的厚度较薄，一方面可将极耳通过超声焊接到所述引出件23上，另一方面焊接完成后可对所述引出件23进行折弯，给极芯留出空间。
当所述电极组件设置为正电极组件，且基于所述连接柱221与所述电极柱21铆接的实施例，所述正电极组件中的所述底板222的厚度为H1，0.5mm≤H1≤2mm；所述正电极组件中的所述引出件23的厚度为H2，0.5mm≤H2≤1mm。
当所述电极组件设置为负电极组件，且基于所述连接柱221与所述电极柱21铆接的实施例，所述负电极组件中的所述底板222的厚度为H3，0.5mm≤H3≤1.5mm；所述负电极组件中的所述引出件23的厚度为H4，0.3mm≤H4≤1mm。
具体地，所述动力电池盖板还包括第一绝缘密封件3，所述第一绝缘密封件3位于所述电极柱21与所述盖板主体1之间，以使得所述电极柱21与所述盖板主体1的外侧面绝缘。
在一实施方式中，所述第一绝缘密封件3的周侧朝向远离所述盖板主体1方向延伸形成有翻边，所述翻边包覆于所述电极柱21的圆周。并且所述翻边的高度小于所述电极柱21的高度。
具体地，所述动力电池盖板还包括第二绝缘密封件4，所述第二绝缘密封件4套设于所述连接柱221的外周，以使得所述连接柱221与所述安装孔11的侧壁绝缘。
具体地，所述动力电池盖板还包括第三绝缘密封件5，所述第三绝缘密封件5设于所述底板222和所述盖板主体1内侧之间，以使得所述底板222与所述盖板主体1的内侧面绝缘。
在一实施方式中，由于极耳与内引出片连接使用超声焊代替激光焊，降低了焊接过程的能量和结构件发热量，因此所述底板222与盖板主体1之间的绝缘塑胶件可以做薄，即所述第三绝缘密封件5的厚度为H5，0.3mm≤H5≤1mm，如此设置既可以满足绝缘耐压要求，有可以为极芯留出更多的空间进而提升电池容量。
所述第一绝缘密封件3、所述第二绝缘密封件4和所述第三绝缘密封件5的材质不做限制，可以是PPS，也可以是PC。
在一实施方式中，所述第一绝缘密封件3和所述第二绝缘密封件4一体成型设置。或者，所述第二绝缘密封件4和所述第三绝缘密封件5一体成型设置。
此外本申请还提供一种动力电池，所述动力电池包括上述技术方案所述的动力电池盖板。需要说明的是，所述动力电池的动力电池盖板的详细结构可参照上述动力电池盖板的实施例，此处不再赘述；由于在本申请的动力电池中使用了上述动力电池盖板，因此，本申请动力电池的实施例包括上述动力电池盖板全部实施例的全部技术方案，且所达到的技术效果也完全相同，在此不再赘述。
具体地，所述动力电池包括至少一个所述动力电池盖板；和/或，所述动力电池盖板设有至少两组所述电极组件，且每一所述动力电池盖板中的两个所述电极组件其中之一为正电极组件，其中另一为负电极组件。即在一实施例中，所述动力电池的电芯极耳同端引出时，所述动力电池包括一个所述动力电池盖板，所述动力电池盖板设有两组所述电极组件，两组所述电极组件中其中一个为正电极组件，另一为负电极组件。在另一实施例中，所述动力电池的电芯极耳相对两端引出时，所述动力电池包括两个所述动力电池盖板，两个所述动力电池盖板设于电芯相对的两侧，每一所述动力电池盖板设有一组所述电极组件，两组所述电极组件中其中一个为正电极组件，另一为负电极组件。
以上所述仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是在本申请的发明构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (10)

  1. 一种动力电池盖板，其中，所述动力电池盖板包括：
    盖板主体；以及，
    至少一组电极组件，包括电极柱、连接件和引出件，所述电极柱设于所述盖板主体的外侧，所述连接件与所述电极柱和所述盖板主体连接，所述引出件位于所述盖板主体内侧，且一端与所述连接件连接，另一端用于与动力电池的电芯连接；
    其中，所述连接件和所述引出件一体成型设置。
  2. 如权利要求1所述的动力电池盖板，其中，所述盖板主体贯设有安装孔；
    所述连接件包括底板和自所述底板一侧凸设的连接柱，所述底板抵紧于所述盖板主体的内侧，所述连接柱穿过所述安装孔与所述电极柱连接，以将所述电极柱固定于所述盖板主体，所述底板与所述引出件连接。
  3. 如权利要求2所述的动力电池盖板，其中，所述底板的一端朝向远离所述连接柱的方向折弯形成有折弯部，所述折弯部构成所述引出件，所述底板的厚度大于所述引出件的厚度。
  4. 如权利要求2所述的动力电池盖板，其中，所述电极组件设置为正电极组件，所述正电极组件中的所述底板的厚度为H1，0.5mm≤H1≤2mm；
    所述正电极组件中的所述引出件的厚度为H2，0.5mm≤H2≤1mm。
  5. 如权利要求2所述的动力电池盖板，其中，所述电极组件设置为负电极组件，所述负电极组件中的所述底板的厚度为H3，0.5mm≤H3≤1.5mm；所述负电极组件中的所述引出件的厚度为H4，0.3mm≤H4≤1mm。
  6. 如权利要求2所述的动力电池盖板，其中，所述动力电池盖板还包括第一绝缘密封件，所述第一绝缘密封件位于所述电极柱与所述盖板主体之间，以使得所述电极柱与所述盖板主体的外侧面绝缘；和/或，
    所述动力电池盖板还包括第二绝缘密封件，所述第二绝缘密封件套设于所述连接柱的外周，以使得所述连接柱与所述安装孔的侧壁绝缘。
  7. 如权利要求6所述的动力电池盖板，其中，所述动力电池盖板还包括第三绝缘密封件，所述第三绝缘密封件设于所述底板和所述盖板主体内侧之间，以使得所述底板与所述盖板主体的内侧面绝缘。
  8. 如权利要求7所述的动力电池盖板，其中，所述第三绝缘密封件的厚度为H5，0.3mm≤H5≤1mm。
  9. 一种动力电池，包括如权利要求1-8任意一项所述的动力电池盖板。
  10. 如权利要求9所述的动力电池，其中，所述动力电池包括至少一个所述动力电池盖板；和/或，
    所述动力电池盖板设有至少两组所述电极组件，且每一所述动力电池盖板中的两个所述电极组件其中之一为正电极组件，其中另一为负电极组件。
PCT/CN2023/091828 2022-04-12 2023-04-28 动力电池盖板及动力电池 Ceased WO2023198220A1 (zh)

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