WO2016197563A1 - 一种二次电池负极封口体 - Google Patents

一种二次电池负极封口体 Download PDF

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Publication number
WO2016197563A1
WO2016197563A1 PCT/CN2015/096608 CN2015096608W WO2016197563A1 WO 2016197563 A1 WO2016197563 A1 WO 2016197563A1 CN 2015096608 W CN2015096608 W CN 2015096608W WO 2016197563 A1 WO2016197563 A1 WO 2016197563A1
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WIPO (PCT)
Prior art keywords
circuit board
board module
battery
negative electrode
electrode cap
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PCT/CN2015/096608
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English (en)
French (fr)
Inventor
常海涛
陈进添
余佑锋
徐小春
张志明
叶永锋
Original Assignee
福建南平南孚电池有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201510323722.5A external-priority patent/CN105047834B/zh
Priority claimed from CN201520406690.0U external-priority patent/CN204792944U/zh
Application filed by 福建南平南孚电池有限公司 filed Critical 福建南平南孚电池有限公司
Publication of WO2016197563A1 publication Critical patent/WO2016197563A1/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
    • 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 of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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 of a single cell or a single battery
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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 invention relates to a secondary battery, and in particular to a secondary battery negative sealing body.
  • secondary batteries also referred to as rechargeable batteries
  • Lithium ion secondary batteries are gradually being applied in the above fields due to their high energy, high power discharge, and environmental protection.
  • the normal operation of the rechargeable battery often needs to cooperate with other functional integrated circuit chips, and has achieved the desired working effect.
  • the rechargeable battery and the integrated circuit chip are separately packaged, and then connected together by the connection of the circuit board and the wires. In this way, there are many external components, many production processes, and high cost.
  • the rechargeable battery and the integrated circuit chip are bulky and have poor performance, which is disadvantageous for miniaturization or miniaturization.
  • the space occupied by each part of the lithium ion secondary battery is relatively fixed, wherein the inside of the polymer battery core includes a positive electrode pole piece, a separator film and a negative electrode pole piece, and is at the positive electrode pole
  • the sheet is sealed from the end of the separator with a specified height of the core, and the cell top seal occupies a certain height of the polymer cell, thereby reducing the effective space inside the polymer cell.
  • the space utilization rate of the polymer battery has a great relationship with the energy density and capacity of the lithium ion secondary battery.
  • the space utilization ratio of the polymer battery core is larger, and the energy density of the lithium ion secondary battery is The capacity is also large. Therefore, the conventional lithium ion secondary battery generally has a problem that the energy density and capacity of the lithium ion secondary battery are low due to the low space utilization ratio of the polymer battery.
  • the present invention provides a secondary battery negative electrode sealing body for closing an opening of a battery case of the secondary electrochemical battery, wherein the sealing body comprises: a negative electrode cap, a circuit board module and a seal a battery housing having a recessed twist line structure at an end thereof adjacent to the negative electrode cap, the battery core being disposed in the battery case between the positive electrode cap and the twisted wire structure;
  • the circuit board module is located between the twisted wire and the negative electrode cap, and the circuit board module is sized to be between the inner diameter of the recess formed by the twisted wire and the inner diameter of the battery case, and is stuck in the One side of the twisted wire is thus isolated from the battery core;
  • the circuit board module is a plastic flexible circuit board having a certain elasticity, and an elastic deformation is generated by the pressing of the sealing ring for being stuck inside the battery case;
  • the sealing ring is a flexible and elastic annular insulating layer disposed in the gap between the battery case, the circuit board module and the negative electrode cap for isolating the
  • connection between the circuit board module and the negative electrode cap is solder.
  • the connecting member between the circuit board module and the negative electrode cap is a snap connection.
  • At least two chucks are provided at the edge of the negative electrode cap for fixing the negative cap on the circuit board module.
  • the circuit board module is provided with at least two card slots on the side of the negative electrode cap corresponding to the edge of the negative electrode cap for mounting the negative electrode cap.
  • the shape of the sealing ring is type, a portion for squeezing the fixed circuit board module between the rifling wire and the battery case, and another portion for isolating the battery case and the negative electrode cap, the sealing ring for isolating the battery
  • the housing and the portion of the negative cap extend a certain distance above the battery housing and are flush with the negative cap to prevent the battery from shorting during charging.
  • the material of the plating layer is a metal conductive material.
  • the plating layer is tin plated.
  • connection portion between the negative electrode cap and the circuit board module is a "C" type annular junction. Structure.
  • the battery further includes a battery core and a positive electrode cap, wherein the positive electrode cap is connected to the battery case to form a positive electrode of the secondary battery; the battery core is placed in the battery case, located at the Between the positive cap and the circuit board module.
  • the structure of the sealing body fitting for the electrochemical cell of the invention is ingenious and reasonable, and has a negative electrode cap at the electrode sealing of the electrochemical battery, and the negative electrode cap can cooperate with the circuit board to form a shielding structure, and heat generated during operation is transmitted to
  • the outside world plays a role in protecting circuit boards and components.
  • a wire structure is arranged on the battery casing corresponding to the battery core and the circuit board for positioning the relative positions of the battery core and the circuit board, and the edge of the circuit board module and the battery are sealed by the sealing ring and the tin-plated structure. The gap between the casing and the twist line is sealed.
  • Figure 1a is a schematic view showing the structure of an electrochemical cell of the present invention.
  • Figure 1b is an exploded perspective view of an electrochemical cell of the present invention.
  • Figure 1c is a cross-sectional view of Figure 1a taken along the line A-A.
  • Figure 2a is a schematic enlarged cross-sectional view of a closure body assembly for an electrochemical cell of the present invention.
  • Figure 2b schematically shows a partial enlarged cross-sectional view of another embodiment of a closure assembly for an electrochemical cell of the present invention.
  • Figure 3 is a cross-sectional, exploded view of a closure assembly for an electrochemical cell of the present invention.
  • FIGS. 1a and 1b are respectively a schematic structural view and an exploded perspective view of the electrochemical cell 100 of the present invention.
  • an electrochemical cell 100 includes a battery case 101, a battery cell 102 disposed in the battery case 101, a negative electrode cap 103, and is disposed between the battery cell 102 and the negative electrode cap 103.
  • the battery cell 102 is jacketed with a battery case 101 and is located between the positive electrode cap 105 and the circuit board module 104.
  • the battery case 101 is a cylindrical or rectangular steel case for outputting a positive electrode and fixing the circuit board module 104.
  • the positive electrode cap 105 is formed in a right-handed structure with the battery case 101 in a right-handed manner to constitute a positive electrode of the secondary battery 100.
  • the circuit board module 104 is at least one printed circuit board (PCB) having a first side and a second side, wherein the first side is directed relative to the electrochemical cell 100 to the negative cap 103 and the second side is opposite the electrochemical Battery 100 is directed to cell 102.
  • the PCB is a circuit board on which a wiring pattern is printed, and has a size substantially corresponding to the inner diameter of the casing of the battery 100.
  • a plurality of printed conductors and components are disposed on a first side or a second side of the circuit board module 104.
  • the circuit board module 104 is adjacent to the negative electrode cap 103 side of the battery 100 between the battery cell 102 and the negative electrode cap 103.
  • the circuit board module 104 is provided with a connecting member for fixing the negative electrode cap 103 to the circuit board module 104.
  • the negative electrode cap 103 may be soldered to the circuit board module 104 by soldering, or may be fixed by a snap connection or the like.
  • at least two chucks are disposed at the edge of the negative cap 103 for fixing the negative cap 103 to the circuit board module 104, and the circuit board module 104 is opposite to the negative cap 103.
  • At least two card slots are provided on the side corresponding to the edge position of the negative electrode cap 103 for mounting the negative electrode cap 103.
  • the circuit negative output terminal of the circuit board module 104 is disposed at a junction of the negative electrode cap 103 and the circuit board such that the negative output is collinear with the circuit ground.
  • the circuit board module is used for lithium battery charging protection, charging indication, and can also be used for battery discharge protection, short circuit protection, over discharge protection, and control output voltage. Electrode connecting wires 108a and 108b are disposed between the circuit board module 104 and the battery cell 102, respectively, and the positive and negative electrodes of the battery are respectively taken out, wherein 108a is a positive connecting wire and 108b is a negative connecting wire.
  • Figure 1c is a cross-sectional view of Figure 1a taken along the line AA.
  • a seal ring 106 is disposed between the circuit board module 104 and the external battery case 101 between the negative electrode cap 103 and the battery case 101.
  • the seal ring 106 is a flexible and resilient annular insulating mat layer capable of functioning to isolate the battery case 101 as the first electrode and the negative electrode cap 103 as the second electrode, and is capable of functioning due to the elastic action of the seal ring 106.
  • the circuit board module 104 is squeezed and fixed to seal the gap between the battery case 101 and the negative electrode cap 103. Specifically, as shown in FIG.
  • the shape of the sealing ring 106 is type, A portion is used to press the fixed circuit board module 104 between the twisted wire 107 and the battery case 101, and another portion is used to isolate the battery case 101 and the negative electrode cap 103.
  • the sealing ring 106 is for isolating portions of the battery case 101 and the negative electrode cap 103, protrudes and is at a certain distance from the battery case 101, and is flush with the negative electrode cap 103 to prevent the battery from being short-circuited during charging.
  • the portion of the sealing ring 106 that is in contact with the inside of the battery case 101 has a circular arc shape for fitting the circular arc structure of the battery case 101.
  • the circuit board module 104 is a plastic flexible circuit board having a certain elasticity, and is elastically deformed by the pressing of the sealing ring 106 for being caught inside the battery case 101.
  • the battery case 101 On the outer surface of the battery case 101, there is a ring-shaped inward annular recess corresponding to the position between the battery cell 102 and the printed circuit board 106, which is a twist line 107.
  • the battery cell 102 is placed in the battery case 101 between the positive electrode cap 105 and the structure of the twist line 107.
  • the arrangement of the seal ring 106 and the twist line 107 allows the circuit board module 104 to be fixed between the annular recess of the battery case 101 and the bottom of the battery case 101, so that the connection of the battery case 101 to the negative electrode cap 103 does not require any soldering.
  • the structure of the twist line 107 is used to position the circuit board module 104.
  • the diameter of the circuit board module 104 is set to be between the inner diameter of the annular recess formed by the twist line 107 and the inner diameter of the battery case 101.
  • the battery cell 102 is first placed in the battery case 101, and then the circuit board module 104 is assembled into the battery case 101.
  • the size of the circuit board module 104 can be caught on the structure of the twisted wire 107 to avoid The contact of the battery cell 102, and then the battery case 101 and the negative electrode cap 103 are separated by the sealing ring 106, completing the assembly of the battery 100.
  • the above structure allows the circuit board module 104 to form a closed space inside the battery case 101 for accommodating the battery cells 102 by means of the structure of the twisted wire 107, so that the volume of the battery cells 102 can be increased, thereby increasing the capacity of the secondary battery.
  • the battery cell 102 is a hermetic structure, and operates by connecting the positive and negative electrodes from the inside of the battery cell 102 to the positive and negative terminals of the corresponding battery.
  • the depth of the recessed line 107 with respect to the surface of the battery case 101 is 0.2-1.2 mm.
  • FIG. 2a schematically shows a partial enlarged cross-sectional view of a closure body assembly 200 for an electrochemical cell of the present invention.
  • the sealing body assembly 200 includes a first PCB 201, a second PCB 202, and a negative electrode cap 203.
  • the first PCB 201 and the second PCB 202 are two printed circuit boards of the same area.
  • the first PCB 201 is adjacent to the battery core 204, and the second PCB 202 is remote from the battery core 204.
  • the first PCB 201 is stuck on the battery case 206 through the twist line 205.
  • the negative electrode cap 203 of the second PCB 202 is electrically connected by contact and constitutes a shielding structure therewith.
  • a plurality of chips or circuit components are disposed on a side of the first PCB 201 adjacent to the battery cell 204 and a side of the second PCB 202 remote from the battery core 204, wherein components that generate radiation during operation are disposed on the second PCB 202 is in the shielding structure composed of the negative electrode cap 203.
  • a seal ring 207 is disposed between the outside of the second PCB 202 and the negative electrode cap 203 and the battery case 206.
  • the sealing ring 207 is a flexible and elastic annular insulating layer disposed in the gap between the battery case 206, the second PCB 202 and the negative electrode cap 203, and a part of the sealing ring 207 is used for squeezing in the battery case 206.
  • the first PCB 201 and the second PCB 202 are pressed and fixed at the twist line 205, and the other portion is used to isolate the battery case 206 and the negative electrode cap 203, and seal the negative electrode cap 203, the battery case 206, and the first PCB 201 and the second PCB.
  • the portion of the sealing ring 207 that is in contact with the inside of the battery case 206 has a circular arc shape for fitting the circular arc structure of the battery case 206.
  • a first plating layer 210 is disposed at a gap between the side edge of the first PCB 201 and the second PCB 202 and the battery case 206, and a second plating layer 211 is disposed at a gap between the first PCB 201 and the twist line 205, and the second plating layer is disposed.
  • 211 extends along a surface of the first PCB 201 near the side of the ⁇ line 205 for a length between 0.5 mm and 3 mm to make electrical contact with the positive wiring 213 on the first PCB 201, thereby implementing the first PCB 201.
  • the positive wiring 213 is in electrical contact with the battery case 206 and can seal the gap between the edges of the first PCB 201 and the second PCB 202 and the battery case 206 and the turns 205.
  • the sealing body fitting 200 for an electrochemical cell according to the present invention can also be applied to a case of a circuit board module having a PCB, as shown in FIG. 2b, a gap between the side edge of the circuit board module 212 and the battery case 206 A first plating layer 210 is disposed, and a second plating layer 211 is disposed at a gap between the circuit board module 212 and the twist line 205.
  • the second plating layer 211 extends along the surface of the circuit board module 212 near the side of the ridge line 205 for a length of between 0.5 mm and 3 mm to match the positive wiring 213 on the circuit board module 212. Electrical contact is achieved to achieve electrical contact of the positive wiring 213 on the circuit board module 212 with the battery housing 206.
  • the material of the plating is a good metallic conductive material, such as tin plating.
  • a negative connection line 208b (208a is a positive connection line, not shown) that leads the battery cell 204 through the through hole 209 between the first PCB and the second PCB is connected to the wires on the first PCB and the second PCB. .
  • the inner surface of the through hole 209 is plated with a conductive material, for example, copper plating, so that wiring of a plurality of circuit boards can be connected through the through holes 209 and connected to a portion where the negative electrode cap and the circuit board are in contact, thereby conducting the same. To the negative cap.
  • a conductive material for example, copper plating
  • the sealing body fitting 300 includes a negative electrode cap 301, a sealing ring 302, and a circuit board module 303.
  • a charging indicator light 305 is disposed on the circuit board module 303 corresponding to the edge of the negative electrode cap 301.
  • the shape of the connection portion between the negative electrode cap 301 and the circuit board module 303 is a "C"-type annular structure, that is, the edge of the negative electrode cap has a notch 304, and the notch 304 is a light-passing opening of the charging indicator light 305, and the notch 304 has a certain height.
  • the sealing ring 302 is a flexible and elastic annular insulating layer, which can completely cover the light-passing port of the charging indicator 305 (as shown in FIG. 3c).
  • the material of the sealing ring 302 is a transparent light guiding material, which can enable the charging indicator 305. The emitted light passes through the sealing ring and causes the entire sealing ring to transmit light.
  • the structure of the sealing body fitting for the electrochemical cell of the invention is ingenious and reasonable, and has a negative electrode cap at the electrode sealing of the electrochemical battery, and the negative electrode cap can cooperate with the circuit board to form a shielding structure, and heat generated during operation is transmitted to
  • the outside world plays a role in protecting circuit boards and components.
  • a wire structure is arranged on the battery casing corresponding to the battery core and the circuit board for positioning the relative positions of the battery core and the circuit board, and the edge of the circuit board module and the battery are sealed by the sealing ring and the tin-plated structure. The gap between the casing and the twist line is sealed.

Abstract

本发明提供了一种二次电池负极封口体，包括：负极帽、电路板模块和密封圈，电池壳体在其靠近负极帽的一端具有凹陷的匝线结构，电路板模块位于匝线与负极帽之间，卡在匝线一侧；电路板模块为塑料柔性电路板；密封圈为一柔性且弹性环形绝缘垫层，布置于电池壳体、电路板模块与负极帽的空隙中；密封圈与电池壳体内部接触的部位为圆弧形，用于配合电池壳体的圆弧结构；电路板模块的侧面边缘与电池壳体之间的缝隙处设置有第一镀层，电路板模块与匝线的缝隙处设置有第二镀层，第二镀层沿电路板模块靠近匝线一侧的表面延伸出一段长度，以与电路板模块上的正极布线实现电接触，从而实现电路板模块上的正极布线与电池壳体的电接触。

Description

一种二次电池负极封口体 技术领域
本发明涉及一种二次电池，具体涉及一种二次电池负极封口体。
背景技术
近年来，二次电池(也称为充电电池)已经广泛应用于各种便携式电气设备和电子设备中，例如玩具、手持设备等，这对二次电池储能能量提出越来越高的要求。锂离子二次电池由于具有能量高、可以高功率放电、环保等优点，因而正在逐渐应用在以上领域。
充电电池的正常工作经常需要与其他功能的集成电路芯片配合，已达到理想的工作效果。通常充电电池与集成电路芯片分别进行封装，然后再通过电路板和导线的连接，结合在一起使用。这样外围元件多，生产工序多、成本高，充电电池与集成电路芯片体积大，性能较差，不利于小型化或微型化。
在进行锂离子二次电池封装时，锂离子二次电池各部分所占的空间都较为固定，其中，该聚合物电芯内部则包括正极极片、隔离膜和负极极片，且在正极极片背离隔离膜的一端具有指定高度的电芯顶封进行封装，由于电芯顶封占据了该聚合物电芯的一定高度，从而减少了该聚合物电芯内部的有效空间。而聚合物电芯的空间利用率与锂离子二次电池的能量密度和容量有较大关系，一般的，该聚合物电芯的空间利用率越大，该锂离子二次电池的能量密度和容量也越大，因此，现有的锂离子二次电池普遍存在着由于聚合物电芯的空间利用率低而导致的锂离子二次电池的能量密度和容量较低的问题。
发明内容
本发明提供了一种二次电池负极封口体，所述封口体用于封闭所述二次电化学电池的电池壳体的开口部，其中所述封口体包括：负极帽、电路板模块和密封圈，所述电池壳体在其靠近所述负极帽的一端具有凹陷的匝线结构，所述电芯放置于所述电池壳体内，位于所述正极帽与所述匝线结构之间；所述电路板模块位于所述匝线与所述负极帽之间，所述电路板模块的直径大小设置为在所述匝线构成的凹陷的内径与电池壳体的内径之间，卡在所述匝线一侧从而与所述电芯隔离；所述电路板模块为塑料柔性电路板，具有一定的弹性，通过所述密封圈的挤压产生弹性形变用于卡在所述电池壳体内部；所述密封圈为一柔性且弹性环形绝缘垫层，布置于所述电池壳体、电路板模块与负极帽的空隙中，用于隔离所述电池壳体和所述负极帽，密封述负极帽、电池壳体及电路板模块；所述密封圈与电池壳体内部接触的部位为圆弧形，用于配合电池壳体的圆弧结构；所述电路板模块的侧面边缘与电池壳体之间的缝隙处设置有第一镀层，所述电路板模块与匝线的缝隙处设置有第二镀层，所述第二镀层沿所述电路板模块靠近所述匝线一侧的表面延伸出一段长度，以与所述电路板模块上的正极布线实现电接触，从而实现所述电路板模块上的正极布线与电池壳体的电接触。
优选地，所述电路板模块与所述负极帽之间的连接件为焊料。
优选地，所述电路板模块与所述负极帽之间的连接件为卡扣连接。
优选地，所述负极帽的边缘处设置有至少两个卡头，用于将所述负极帽固定在所述电路板模块上。
优选地，所述电路板模块相对于所述负极帽的一侧上对应于所述负极帽的边缘位置设置有至少两个卡槽，用于安装所述负极帽。
优选地，所述密封圈的形状为
Figure PCTCN2015096608-appb-000001
型，
Figure PCTCN2015096608-appb-000002
的一部分用于挤压固定电路板模块于所述匝线和所述电池壳体之间，另一部分用于隔离所述电池壳体和所述负极帽，所述密封圈用于隔离所述电池壳体和所述负极帽的部分，伸出并高于所述电池壳体一定距离，并与所述负极帽齐平，以防止所述电池在充电时产生短路。
优选地，所述镀层的材料为金属导电材料。
优选地，所述镀层为镀锡。
优选地，所述负极帽与电路板模块连接部位的形状为“C”型环状结 构。
优选地，所述电池还包括电芯和正极帽，其中，所述正极帽与所述电池壳体连接构成所述二次电池的正极；所述电芯放置于所述电池壳体内，位于所述正极帽与所述电路板模块之间。
本发明的用于电化学电池的封口体配件结构设计巧妙合理，在所述电化学电池电极封口处具有负极帽，所述负极帽能够与电路板配合形成屏蔽结构，工作时产生的热量传导给外界，起到保护电路板及元器件的作用。另外，所述电池壳体上对应于电芯与电路板之间布置有匝线结构，用于定位电芯和电路板的相对位置，并通过密封圈和镀锡结构将电路板模块边缘与电池壳体和匝线之间的缝隙密封。
附图说明
参考随附的附图，本发明更多的目的、功能和优点将通过本发明实施方式的如下描述得以阐明，其中：
图1a示意性示出了本发明的电化学电池的结构示意图。
图1b是本发明的电化学电池的分解透视图。
图1c是图1a沿A-A方向的剖面图。
图2a示意性示出了本发明的用于电化学电池的封口体配件的局部放大剖视图。
图2b示意性示出了本发明的用于电化学电池的封口体配件的另一实施例的局部放大剖视图。
图3为本发明的用于电化学电池的封口体配件的剖视分解图。
具体实施方式
通过参考示范性实施例，本发明的目的和功能以及用于实现这些目的和功能的方法将得以阐明。然而，本发明并不受限于以下所公开的示范性实施例；可以通过不同形式来对其加以实现。说明书的实质仅仅是帮助相关领域技术人员综合理解本发明的具体细节。
应当理解，前述大体的描述和后续详尽的描述均为示例性说明和解释，并不应当用作对本发明所要求保护内容的限制。
在下文中，将参考附图描述本发明的实施例。在附图中，相同的附图标记代表相同或类似的部件，或者相同或类似的步骤。
本发明提供一种电化学二次电池，图1a、1b分别为本发明的电化学电池100的结构示意图和分解透视图。如图1a、1b所示，一种电化学电池100，包括：电池壳体101、置于电池壳体101内的电芯102、负极帽103、置于电芯102和负极帽103之间的空间的电路板模块104以及正极帽105。电芯102外套有电池壳体101，并位于正极帽105与电路板模块104之间。电池壳体101为圆柱体或长方体结构的钢壳，用于输出正极，固定电路板模块104。根据本发明的一个实施例，正极帽105右旋地与所述电池壳体101成型为一体结构，构成二次电池100的正极。
电路板模块104为至少一层印刷电路板(PCB)，具有第一侧和第二侧，其中第一侧相对于所述电化学电池100指向负极帽103，第二侧相对于所述电化学电池100指向电芯102。PCB是其上印刷有布线图案的电路板，并具有与所述电池100的壳体内径具有大致对应的尺寸。多个印制导线和元器件布置在电路板模块104的第一侧或第二侧。电路板模块104靠近所述电池100的负极帽103侧，位于电芯102和负极帽103之间。
电路板模块104上设置有连接件从而将负极帽103固定在电路板模块104上，例如，负极帽103可以通过焊料焊接在电路板模块104上，也可以通过卡扣连接等方式固定。优选地，采用卡扣方式连接时，负极帽103的边缘处设置有至少两个卡头，用于将负极帽103固定在电路板模块104上，而电路板模块104相对于负极帽103的一侧上对应于所述负极帽103的边缘位置设置有至少两个卡槽，用于安装负极帽103。电路板模块104的电路负极输出端设置在所述负极帽103与电路板的连接处，使负极输出与电路接地共线。
电路板模块用于锂电池充电保护、充电指示，还可以用于电池的放电保护、短路保护、过放保护以及控制输出电压。电路板模块104和电芯102之间设置有电极连接线108a和108b，分别将电池的正负极分别引出，其中108a为正极连接线，108b为负极连接线。
图1c是图1a沿A-A方向的剖面图。在电路板模块104与外部的电池壳体101之间，负极帽103与电池壳体101之间设置有密封圈106。密 封圈106为一柔性且具有弹性的环形绝缘垫层，其能够起到隔离作为第一电极的电池壳体101和作为第二电极的负极帽103的作用，并且由于密封圈106的弹性作用能够挤压并固定电路板模块104，密封电池壳体101和负极帽103之间的空隙。具体地，如图1c所示，密封圈106的形状为
Figure PCTCN2015096608-appb-000003
型，
Figure PCTCN2015096608-appb-000004
的一部分用于挤压固定电路板模块104于所述匝线107和电池壳体101之间，另一部分用于隔离所述电池壳体101和所述负极帽103。密封圈106用于隔离电池壳体101和负极帽103的部分，伸出并高于电池壳体101一定距离，并与负极帽103齐平，以防止所述电池在充电时产生短路。
优选地，密封圈106与电池壳体101内部接触的部位为圆弧形，用于配合电池壳体101的圆弧结构。优选地，电路板模块104为塑料柔性电路板，具有一定的弹性，通过密封圈106的挤压产生弹性形变用于卡在电池壳体101内部。
电池壳体101的外表面上对应电芯102和印刷电路板106之间的位置有一圈向内的环形凹陷，为匝线107。将所述电芯102放置于所述电池壳体101内，位于正极帽105与所述匝线107的结构之间。密封圈106和匝线107的设置使得电路板模块104固定在电池壳体101的环形凹陷与电池壳体101底部之间，因此电池壳体101与负极帽103的连接不需要任何焊接。
匝线107结构的设置用于定位电路板模块104，具体地，将电路板模块104的直径大小设置为在匝线107所构成的环形凹陷的内径与电池壳体101的内径之间，在装配电池时，先将电芯102放置到电池壳体101中，然后将电路板模块104装配到电池壳体101中，电路板模块104的大小尺寸可以卡在匝线107的结构上从而避免了与电芯102的接触，然后再通过密封圈106将电池壳体101与负极帽103进行隔离，完成了电池100的装配。上述结构使得电路板模块104借助匝线107的结构在电池壳体101内部形成了一个封闭的空间用于容纳电芯102，从而可以增大电芯102的体积，因此增大二次电池的容量。优选地，电芯102为一密闭结构，通过从电芯102内部引出其正负极与相应的电池正负极相连而进行工作。
优选地，上述匝线107相对于电池壳体101表面的凹陷深度为0.2-1.2mm。
图2a示意性示出了本发明的用于电化学电池的封口体配件200的局部放大剖视图。如图2所示，所述封口体配件200包括第一PCB 201、第二PCB 202、负极帽203。根据本发明的一个实施例，第一PCB 201和第二PCB 202为面积相同的两块印刷电路板。所述第一PCB 201靠近电芯204，所述第二PCB 202远离电芯204。第一PCB 201通过匝线205卡在电池壳体206上。第二PCB 202所述负极帽203通过接触实现电连接，并与其组成一个屏蔽结构。第一PCB 201靠近电芯204的一侧和第二PCB 202远离电芯204的一侧布置有多个芯片或电路元器件，其中，在工作过程中会产生辐射的元器件布置在第二PCB 202与负极帽203组成的屏蔽结构中。在第二PCB 202、负极帽203的外部与电池壳体206及之间设置有密封圈207。密封圈207为一柔性且弹性环形绝缘垫层，布置于所述电池壳体206、第二PCB 202与负极帽203的空隙中，所述密封圈207的一部分用于在电池壳体206的挤压下固定第一PCB 201和第二PCB 202于匝线205处，另一部分用于隔离电池壳体206和负极帽203，密封负极帽203、电池壳体206及第一PCB 201和第二PCB 202之间的空隙。密封圈207与电池壳体206内部接触的部位为圆弧形，用于配合电池壳体206的圆弧结构。
第一PCB 201和第二PCB 202的侧面边缘与电池壳体206之间的缝隙处设置有第一镀层210，第一PCB 201与匝线205的缝隙处设置有第二镀层211，第二镀层211沿第一PCB 201靠近匝线205一侧的表面延伸出一段长度，长度在0.5mm～3mm之间，以与第一PCB 201上的正极布线213实现电接触，从而实现第一PCB 201上的正极布线213与电池壳体206的电接触，并能密封第一PCB 201和第二PCB 202边缘与电池壳体206和匝线205之间的缝隙。根据本发明的用于电化学电池的封口体配件200还可以应用于具有一块PCB的电路板模块的情况，如图2b所示，电路板模块212的侧面边缘与电池壳体206之间的缝隙处设置有第一镀层210，电路板模块212与匝线205的缝隙处设置有第二镀层211。第二镀层211沿电路板模块212靠近匝线205一侧的表面延伸出一段长度，长度在0.5mm～3mm之间，以与电路板模块212上的正极布线213 实现电接触，从而实现电路板模块212上的正极布线213与电池壳体206的电接触。优选地，镀层的材料为良好的金属导电材料，例如：镀锡。通过第一PCB和第二PCB之间的通孔209，将电芯204引出的负极连接线208b(208a为正极连接线，图中未示出)与第一PCB和第二PCB上的导线相连。通孔209的内表面镀有导电材料，例如为镀铜，因此可以将多个电路板的布线可以通过通孔209连接在一起，并与负极帽和电路板接触的部位相连，从而将其传导至负极帽。
图3为本发明的用于电化学电池的封口体配件300的剖视分解图。如图3所示，所述封口体配件300包括负极帽301、密封圈302、电路板模块303。电路板模块303上与负极帽301的边缘对应处设置有充电指示灯305。负极帽301与电路板模块303连接部位的形状为“C”型环状结构，即负极帽的边缘具有缺口304，缺口304为充电指示灯305的通光口，所述缺口304具有一定的高度但不超过负极帽的高度，用以将充电指示灯305暴露出来，其位置对应电路板模块303上的充电指示灯305的位置。密封圈302为一柔性且弹性环形绝缘垫层，能够完全覆盖住充电指示灯305的通光口(如图3c所示)，密封圈302的材料为透明导光材料，能够使充电指示灯305发出的亮光透过所述密封圈并使得整个密封圈透光。
本发明的用于电化学电池的封口体配件结构设计巧妙合理，在所述电化学电池电极封口处具有负极帽，所述负极帽能够与电路板配合形成屏蔽结构，工作时产生的热量传导给外界，起到保护电路板及元器件的作用。另外，所述电池壳体上对应于电芯与电路板之间布置有匝线结构，用于定位电芯和电路板的相对位置，并通过密封圈和镀锡结构将电路板模块边缘与电池壳体和匝线之间的缝隙密封。
结合这里披露的本发明的说明和实践，本发明的其他实施例对于本领域技术人员都是易于想到和理解的。说明和实施例仅被认为是示例性的，本发明的真正范围和主旨均由权利要求所限定。

Claims (10)

  1. 一种二次电池负极封口体，所述封口体用于封闭所述二次电化学电池的电池壳体的开口部，其中所述封口体包括：负极帽、电路板模块和密封圈，
    所述电池壳体在其靠近所述负极帽的一端具有凹陷的匝线结构，所述电芯放置于所述电池壳体内，位于所述正极帽与所述匝线结构之间；
    所述电路板模块位于所述匝线与所述负极帽之间，所述电路板模块的直径大小设置为在所述匝线构成的凹陷的内径与电池壳体的内径之间，卡在所述匝线一侧从而与所述电芯隔离；所述电路板模块为塑料柔性电路板，具有一定的弹性，通过所述密封圈的挤压产生弹性形变用于卡在所述电池壳体内部；
    所述密封圈为一柔性且弹性环形绝缘垫层，布置于所述电池壳体、电路板模块与负极帽的空隙中，用于隔离所述电池壳体和所述负极帽，密封所述负极帽、电池壳体及电路板模块；
    所述密封圈与电池壳体内部接触的部位为圆弧形，用于配合电池壳体的圆弧结构；
    所述电路板模块的侧面边缘与电池壳体之间的缝隙处设置有第一镀层，所述电路板模块与匝线的缝隙处设置有第二镀层，所述第二镀层沿所述电路板模块靠近所述匝线一侧的表面延伸出一段长度，以与所述电路板模块上的正极布线实现电接触，从而实现所述电路板模块上的正极布线与电池壳体的电接触。
  2. 根据权利要求1所述的封口体，其中所述电路板模块与所述负极帽之间的连接件为焊料。
  3. 根据权利要求1所述的封口体，其中所述电路板模块与所述负极帽之间的连接件为卡扣连接。
  4. 根据权利要求3所述的封口体，其中所述负极帽的边缘处设置有至少两个卡头，用于将所述负极帽固定在所述电路板模块上。
  5. 根据权利要求3所述的封口体，其中所述电路板模块相对于所述负极帽的一侧上对应于所述负极帽的边缘位置设置有至少两个卡槽，用 于安装所述负极帽。
  6. 根据权利要求1所述的封口体，其中所述密封圈的形状为
    Figure PCTCN2015096608-appb-100001
    型，
    Figure PCTCN2015096608-appb-100002
    的一部分用于挤压固定电路板模块于所述匝线和所述电池壳体之间，另一部分用于隔离所述电池壳体和所述负极帽，所述密封圈用于隔离所述电池壳体和所述负极帽的部分，伸出并高于所述电池壳体一定距离，并与所述负极帽齐平，以防止所述电池在充电时产生短路。
  7. 根据权利要求1所述的封口体，其中所述镀层的材料为金属导电材料。
  8. 根据权利要求7所述的封口体，其中所述镀层为镀锡。
  9. 根据权利要求1所述的封口体，其中所述负极帽与电路板模块连接部位的形状为“C”型环状结构。
  10. 一种包含如权利要求1所述的封口体的二次电化学电池，所述电池还包括电芯和正极帽，其中，
    所述正极帽与所述电池壳体连接构成所述二次电池的正极；
    所述电芯放置于所述电池壳体内，位于所述正极帽与所述电路板模块之间。
PCT/CN2015/096608 2015-06-12 2015-12-08 一种二次电池负极封口体 WO2016197563A1 (zh)

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