CN101083317A - Secondary batteries - Google Patents

Secondary batteries Download PDF

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Publication number
CN101083317A
CN101083317A CNA2006100834579A CN200610083457A CN101083317A CN 101083317 A CN101083317 A CN 101083317A CN A2006100834579 A CNA2006100834579 A CN A2006100834579A CN 200610083457 A CN200610083457 A CN 200610083457A CN 101083317 A CN101083317 A CN 101083317A
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Prior art keywords
current collector
terminal
secondary cell
utmost point
current
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Pending
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CNA2006100834579A
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Chinese (zh)
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汪鲁建
吴强
颜海鹏
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BYD Co Ltd
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BYD Co Ltd
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Priority to CNA2006100834579A priority Critical patent/CN101083317A/en
Publication of CN101083317A publication Critical patent/CN101083317A/en
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    • 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

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Abstract

一种二次电池，包括外壳(11)、端子(12)、正极极组(13)、负极极组(14)、隔膜(15)和第一集流器(16)，其中，第一集流器(16)的两面分别与端子(12)和正极极组(13)或负极极组(14)直接连接。本发明提供的二次电池，不仅使集流器和端子可以不必利用镍带或其它介质而直接紧密连接，从而避免了堵转电流的产生，而且可以使极组的电流通过集流器的端面直接导入端子，从而电流在经过集流器的过程中产生的电阻将明显减小，因此有效降低了电池的内阻，使得二次电池的容量和大电流放电性能均显著提高。同时，本发明提供的二次电池还具有结构简单，便于装配等优点。

A secondary battery, comprising a casing (11), a terminal (12), a positive electrode group (13), a negative electrode group (14), a separator (15) and a first current collector (16), wherein the first collector The two sides of the flow device (16) are respectively directly connected with the terminal (12) and the positive pole group (13) or the negative pole group (14). The secondary battery provided by the invention not only enables the current collector and the terminal to be directly and closely connected without using nickel strips or other media, thereby avoiding the generation of locked-rotor current, but also allows the current of the pole group to pass through the end face of the current collector Directly lead into the terminal, so that the resistance generated by the current passing through the current collector will be significantly reduced, so the internal resistance of the battery is effectively reduced, and the capacity and high-current discharge performance of the secondary battery are significantly improved. At the same time, the secondary battery provided by the invention also has the advantages of simple structure and convenient assembly.

Description

一种二次电池a secondary battery

技术领域technical field

本发明涉及电池领域，更具体地，涉及一种二次电池。The present invention relates to the field of batteries, and more specifically, to a secondary battery.

背景技术Background technique

目前随着各种便携式电动工具的广泛使用，作为电动工具源动力的二次电池也在不断进行改进，以提高其容量及大电流放电性能，从而满足市场需求。但是，现有的二次电池中形成有较大的堵转电流及电阻，这已成为影响电池容量和大电流放电性能的最主要因素。At present, with the widespread use of various portable electric tools, the secondary battery as the power source of the electric tool is also being continuously improved to improve its capacity and high-current discharge performance, so as to meet market demand. However, the existing secondary batteries have a large locked-rotor current and resistance, which have become the most important factors affecting the battery capacity and high-current discharge performance.

CN2681364Y中公开了一种二次电池，如图1所示，该二次电池包括：外壳1、正极端子2、正极极组3、负极极组4和集流片6，其中，所述集流片6由焊接端子端面6a、导电轴心6b和集流端面6c三部分组成，并且正极端子2与焊接端子端面6a紧密连接，正极极组3与集流端面6c紧密连接，如图2所示。A secondary battery is disclosed in CN2681364Y. As shown in FIG. 1, the secondary battery includes: a casing 1, a positive terminal 2, a positive electrode group 3, a negative electrode group 4 and a current collector 6, wherein the current collector The sheet 6 is composed of three parts: the welding terminal end face 6a, the conductive axis 6b and the current collecting end face 6c, and the positive terminal 2 is closely connected with the welding terminal end face 6a, and the positive pole group 3 is closely connected with the current collecting end face 6c, as shown in Figure 2 .

具有上述结构的二次电池，虽然解决了传统电池由于利用弯折的镍带连接集流片和正极端子，而容易在该弯折部位形成堵转电流的缺陷，但是，由于正极极组3的电流在通过集流端面6c集流后，还必须通过导电轴心6b和焊接端子端面6a，才能导入正极端子2，而在此过程中，导电轴心6b和焊接端子端面6c必定会产生电阻，因此电池的容量和大电流放电性能将受到很大影响。Although the secondary battery with the above structure solves the defect that the traditional battery is easy to form a locked-rotor current at the bent part due to the use of a bent nickel strip to connect the current collector and the positive terminal, however, due to the positive electrode group 3 After the current is collected by the current-collecting end surface 6c, it must also pass through the conductive axis 6b and the welding terminal end surface 6a before it can be introduced into the positive terminal 2. During this process, the conductive axis 6b and the welding terminal end surface 6c will definitely generate resistance. Therefore, the capacity and high-current discharge performance of the battery will be greatly affected.

发明内容Contents of the invention

本发明的目的是提供一种大容量且大电流放电性能显著提高的二次电池。The purpose of the present invention is to provide a secondary battery with large capacity and significantly improved high-current discharge performance.

本发明提供的二次电池包括外壳、端子、正极极组、负极极组、隔膜和第一集流器，其中，第一集流器的两面分别与端子和正极极组或负极极组直接连接。The secondary battery provided by the present invention includes a casing, a terminal, a positive pole group, a negative pole group, a diaphragm and a first current collector, wherein the two sides of the first current collector are respectively directly connected to the terminal and the positive pole group or the negative pole group .

本发明提供的二次电池，不仅使集流器和端子可以不必利用镍带或其它介质而直接紧密连接，从而避免了堵转电流的产生，而且可以使极组的电流通过集流器的端面直接导入端子，从而电流在经过集流器的过程中产生的电阻将明显减小，因此有效降低了电池的内阻，使得二次电池的容量和大电流放电性能均显著提高。同时，本发明提供的二次电池还具有结构简单，便于装配等优点。The secondary battery provided by the invention not only enables the current collector and the terminal to be directly and closely connected without using nickel strips or other media, thereby avoiding the generation of locked-rotor current, but also allows the current of the pole group to pass through the end face of the current collector Directly lead into the terminal, so that the resistance generated by the current passing through the current collector will be significantly reduced, so the internal resistance of the battery is effectively reduced, and the capacity and high-current discharge performance of the secondary battery are significantly improved. At the same time, the secondary battery provided by the invention also has the advantages of simple structure and convenient assembly.

附图说明Description of drawings

图1为CN2681364Y中公开的二次电池的结构示意图；Fig. 1 is the structural representation of the secondary battery disclosed in CN2681364Y;

图2为图1的局部放大图；Figure 2 is a partially enlarged view of Figure 1;

图3为本发明提供的二次电池的结构示意图；Fig. 3 is a schematic structural view of a secondary battery provided by the present invention;

图4为本发明提供的二次电池的结构示意图。Fig. 4 is a schematic structural diagram of a secondary battery provided by the present invention.

具体实施方式Detailed ways

本发明提供的二次电池包括外壳11、端子12、正极极组13、负极极组14、隔膜15和第一集流器16，其中，第一集流器16的两面分别与端子12和正极极组13或负极极组14直接连接，如图3所示。通常，端子12与第一集流器16之间的接触面可以通过本领域公知的各种方式实现紧密连接，优选的，通过分布于端子12上的多个焊点直接与第一集流器16紧密焊接在一起。第一集流器16与正极极组13或负极极组14之间的接触面也可以通过本领域公知的各种方式实现紧密连接，优选的，两者之间紧密焊接在一起。为使第一集流器16的两个表面分别与端子12和正极极组13或负极极组14直接紧密连接，第一集流器16为平板形状，而且可以根据需要形成为圆形平板、椭圆形平板或多边形平板等。The secondary battery provided by the present invention comprises a casing 11, a terminal 12, a positive pole group 13, a negative pole group 14, a separator 15 and a first current collector 16, wherein the two sides of the first current collector 16 are connected to the terminal 12 and the positive pole respectively. The electrode group 13 or the negative electrode group 14 are directly connected, as shown in FIG. 3 . Usually, the contact surface between the terminal 12 and the first current collector 16 can be closely connected by various methods known in the art, preferably, through a plurality of welding points distributed on the terminal 12 directly connected to the first current collector 16 tightly welded together. The contact surface between the first current collector 16 and the positive electrode group 13 or the negative electrode group 14 can also be closely connected by various methods known in the art, preferably, the two are tightly welded together. In order to make the two surfaces of the first current collector 16 directly and closely connected with the terminal 12 and the positive pole group 13 or the negative pole group 14 respectively, the first current collector 16 is a flat plate shape, and can be formed as a circular flat plate, Oval flat or polygonal flat etc.

根据本发明一种具体的实施方式，端子12为正极端子，第一集流器16为正极集流器，该正极集流器的两面分别与正极端子和正极极组13直接连接。According to a specific embodiment of the present invention, the terminal 12 is a positive terminal, the first current collector 16 is a positive current collector, and the two sides of the positive current collector are directly connected to the positive terminal and the positive pole group 13 respectively.

优选情况下，如图4所示，本发明提供的二次电池还包括位于端子12内部的安全阀17，而且端子12突出到外壳11外面的部分上包括泄气孔18。所述安全阀17的结构、形状和材料没有特别限定，可以使用本领域公知的各种安全阀。所述泄气孔18可以位于端子12突出到外壳11外面的部分上的任意位置，如上表面或侧面等，优选位于端子12的侧面。在组装电池时，安全阀受到一定程度的压缩，这样在正常情况下，电池的内压较小，安全阀处于密封状态。当电池由于意外的原因导致其内压急剧增大时，安全阀将及时启动，通过泄气阀排出气体及杂质，以及时降低电池的内压。Preferably, as shown in FIG. 4 , the secondary battery provided by the present invention further includes a safety valve 17 inside the terminal 12 , and the part of the terminal 12 protruding outside the casing 11 includes a vent hole 18 . The structure, shape and material of the safety valve 17 are not particularly limited, and various safety valves known in the art can be used. The vent hole 18 can be located at any position on the part of the terminal 12 protruding outside the housing 11 , such as the upper surface or the side, and is preferably located at the side of the terminal 12 . When the battery is assembled, the safety valve is compressed to a certain extent, so that under normal conditions, the internal pressure of the battery is small and the safety valve is in a sealed state. When the internal pressure of the battery increases sharply due to unexpected reasons, the safety valve will be activated in time to discharge gas and impurities through the vent valve, so as to reduce the internal pressure of the battery in time.

优选情况下，本发明提供的二次电池还包括位于外壳11内与第一集流器16相对的一端的第二集流器19，其中第二集流器19的两面分别与外壳11的内部底面和负极极组14或正极极组13直接连接。通常，负极极组14或正极极组13与第二集流器19之间以及第二集流器19与外壳11的内部底面之间的接触面可以通过本领域公知的各种方式实现紧密连接，优选的，通过焊接紧密连接。为使第二集流器19的两个表面分别与负极极组14或正极极组13和外壳11的内部底面直接紧密连接，第二集流器19为平板形状，而且可以根据需要形成为圆形平板、椭圆形平板或多边形平板等。Preferably, the secondary battery provided by the present invention also includes a second current collector 19 located at the end of the casing 11 opposite to the first current collector 16, wherein the two sides of the second current collector 19 are respectively connected to the inside of the casing 11. The bottom surface is directly connected to the negative electrode group 14 or the positive electrode group 13 . Generally, the contact surfaces between the negative electrode group 14 or the positive electrode group 13 and the second current collector 19 and between the second current collector 19 and the inner bottom surface of the casing 11 can be closely connected by various methods known in the art. , preferably, tightly connected by welding. In order to make the two surfaces of the second current collector 19 directly and closely connected with the inner bottom surface of the negative pole group 14 or the positive pole group 13 and the casing 11 respectively, the second current collector 19 is in the shape of a flat plate, and can be formed into a circle as required. Shaped plate, oval plate or polygonal plate, etc.

根据上述本发明一种具体的实施方式，即在端子12为正极端子，第一集流器16为正极集流器，该正极集流器的两面分别与正极端子和正极极组13直接连接的情况下，所述第二集流器19为负极集流器，该负极集流器的两面分别与外壳11的内部底面和负极极组14直接连接。According to a specific embodiment of the present invention described above, the terminal 12 is a positive terminal, the first current collector 16 is a positive current collector, and the two sides of the positive current collector are directly connected to the positive terminal and the positive pole group 13 respectively. In some cases, the second current collector 19 is a negative electrode current collector, and the two sides of the negative electrode current collector are directly connected to the inner bottom surface of the casing 11 and the negative electrode group 14 respectively.

最后需要说明的是，为保证电池装配紧固，可以在外壳内设置套装在端子上的盖板，且端子与盖板之间可以采用本领域技术人员公知的各种方式，如焊接等实现连接。同时为保证电池的密封性，可以在电池中设置密封圈、扣圈等。作为本领域技术人员所公知的，对上述以及其他二次电池所必需的结构及装配在此不再赘述。Finally, it should be noted that in order to ensure that the battery is assembled tightly, a cover plate set on the terminal can be provided in the casing, and various methods known to those skilled in the art can be used between the terminal and the cover plate, such as welding. . At the same time, in order to ensure the tightness of the battery, a sealing ring, a snap ring, etc. can be arranged in the battery. As is well known to those skilled in the art, the necessary structures and assemblies of the above and other secondary batteries will not be repeated here.

Claims (10)

1. secondary cell, comprise shell (11), terminal (12), anodal utmost point group (13), negative pole utmost point group (14), barrier film (15) and first current collector (16), it is characterized in that the two sides of first current collector (16) directly is connected with anodal utmost point group (13) or negative pole utmost point group (14) with terminal (12) respectively.
2. secondary cell according to claim 1, wherein, the contact-making surface between terminal (12) and first current collector (16) welds together by solder joint and first current collector (16) that is distributed on the terminal (12).
3. secondary cell according to claim 1, wherein, between first current collector (16) and anodal utmost point group (13) or the negative pole utmost point group (14) by being welded to connect.
4. secondary cell according to claim 1, wherein, first current collector (16) is a writing board shape.
5. secondary cell according to claim 4, wherein, first current collector (16) is circular flat board, elliptical plate or polygon flat board.
6. secondary cell according to claim 1, wherein, described secondary cell also comprises and is positioned at the inner safety valve (17) of terminal (12), terminal (12) is projected on the part of shell (11) outside and comprises bleeder port (18).
7. secondary cell according to claim 1, wherein, described secondary cell also comprises second current collector (19) that is positioned at shell (a 11) end relative with first current collector (16), and the two sides of second current collector (19) directly is connected with negative pole utmost point group (14) or anodal utmost point group (13) with the inner bottom surface of shell (11) respectively.
8. secondary cell according to claim 7, wherein, between negative pole utmost point group (14) or anodal utmost point group (13) and second current collector (19) and/or between the inner bottom surface of second current collector (19) and shell (11) by being welded to connect.
9. secondary cell according to claim 7, wherein, second current collector (19) is a writing board shape.
10. secondary cell according to claim 9, wherein, second current collector (19) is circular flat board, elliptical plate or polygon flat board.
CNA2006100834579A 2006-05-31 2006-05-31 Secondary batteries Pending CN101083317A (en)

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CN101887957A (en) * 2010-06-24 2010-11-17 朝阳立塬新能源有限公司 Self-riveting low internal resistance energy storage device
CN106803563A (en) * 2017-03-16 2017-06-06 华霆（合肥）动力技术有限公司 Battery modules and welding system
CN112072058A (en) * 2020-11-11 2020-12-11 江苏时代新能源科技有限公司 Battery cell, battery, electric device, and battery manufacturing method
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