CN111740048B - Lithium-ion secondary battery - Google Patents

Abstract

The present invention provides a lithium-ion secondary battery, comprising a soft-packed lithium-ion battery cell, a steel case, a MicroUSB interface, a protection IC, an integrated IC, a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor , the third capacitor, inductor, LED light, plastic parts, rigid FR-4 substrate and metal cap, to achieve MicroUSB interface rechargeable, constant voltage output, charging management and protection, overcharge, over-discharge and over-current protection multi-integrated functions. Compared with the prior art, the lithium ion secondary battery of the present invention has the characteristics of high capacity and easy assembly.

Description

Lithium-ion secondary battery

technical field

The invention relates to a lithium ion secondary battery, in particular to a self-contained MicroUSB interface and a charging input function, which integrates constant voltage output, charging management and charging protection, battery protection (including overcharge protection, overdischarge protection, Overcurrent protection) and other functions, and also a high-capacity single-plate lithium-ion secondary battery with lateral lateral openings.

Background technique

Lithium-ion secondary batteries have the advantages of high energy density, recyclability, high specific energy, and long life, and applications of lithium-ion secondary batteries are becoming more and more extensive. One of the application directions is to replace primary batteries, such as toys, smart homes, cameras and other applications. The single-use cost of lithium-ion secondary batteries is lower than that of primary batteries, showing strong competitiveness. The lithium-ion secondary battery needs to be charged before use, and the usual method is to provide a special charger, which increases the initial purchase cost and is inconvenient.

In order to realize the use of lithium-ion secondary batteries instead of primary batteries, usually the cells and structural parts of lithium-ion secondary batteries (generally including circuit boards, circuit components, protective casings, input interfaces, output interfaces, etc.) Through integrated assembly, a lithium-ion secondary battery with various management and protection functions is finally formed, the output voltage meets the application requirements of the primary battery, and the overall size and mechanical reliability of the battery meet the international standards. At the same time, in order to facilitate charging, the lithium-ion secondary battery is integrated with a charging interface, and the smartphone charger is used as a shared charger to charge the lithium-ion secondary battery, which saves the cost of configuring a dedicated charger.

However, the existing integration methods have the following problems: First, the integration process is complicated. Due to the need for various components such as integrated circuit boards, circuit components, protective casings, input interfaces, and output interfaces, the integration is relatively difficult, and the integration effect and appearance are not ideal. The existing integration methods often lead to complex processing technology and space. Low utilization rate and poor appearance. Second, the integration efficiency is not high. The existing method of setting auxiliary structural parts has low integration efficiency. Various auxiliary structural parts usually occupy a large amount of internal space of the battery, so that only small-sized and low-capacity cells can be selected. Compared with the primary battery, the capacity advantage of the lithium ion secondary battery after the integration is not obvious. Third, the reliability of integration is not high, unreasonable structure, complex processing technology, low integration efficiency, and many factors lead to the low overall reliability of the final integrated battery.

Therefore, in view of the demand for the use of lithium ion secondary batteries instead of primary batteries, how to combine the performance and structural characteristics of lithium ion secondary batteries with the use requirements of primary batteries, and how to combine the charging management, protection, and appearance of primary batteries with lithium ion secondary batteries. On the basis of taking into account the cost, efficiency and reliability of the integration, the space occupied by the auxiliary structural parts is minimized, the appearance consistency is improved to the greatest extent, the convenience of the charging method is improved, and the integration efficiency is improved. Efficiency and reliability are very necessary.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a lithium-ion secondary battery, which has a MicroUSB charging input interface, a simpler process structure, a simpler integrated assembly process, and a higher integration level. , Lithium ion secondary battery with larger capacity and higher reliability, compared with the prior art, the lithium ion secondary battery of the present invention has the charging input function of the MicroUSB charging interface, which can realize that the battery can always output electric energy during the working process. Maintain a constant output voltage, and include charge management and protection, discharge undervoltage protection, charge overvoltage protection, charge overcurrent protection, discharge overcurrent protection, and short circuit protection. The lithium ion secondary battery has good appearance consistency, and is very suitable for the application occasion where the lithium ion secondary battery replaces the primary battery.

The present invention is realized through the following scheme:

A lithium-ion secondary battery (hereinafter abbreviated as "battery"), comprising a metal cap, a soft-packed lithium-ion battery, a steel case, a MicroUSB interface, a protection IC, an integrated IC (integrated charging function and constant voltage output function), The first resistor, the second resistor, the third resistor, the first capacitor, the second capacitor, the third capacitor, the inductor, the LED lamp, the plastic part and the rigid FR-4 substrate, realize the MicroUSB interface rechargeable, constant voltage output, charging management And protection, overcharge, over-discharge and over-current protection multiple functions. The flexible packaged lithium-ion battery is placed in the steel case, and the positive and negative terminals of the flexible-packaged lithium-ion battery pass through the positive electrode wire of the battery cell, the negative electrode wire of the battery cell and the first port pad on the B side of the rigid FR-4 substrate. The port pads are connected correspondingly, the metal cap is placed in the plastic part, and the first cylinder of the metal cap protrudes from the upper end plane of the first cylindrical drawing body of the plastic part. It is installed in the plastic part upwards and the open end of the MicroUSB interface is matched in the MicroUSB opening of the plastic part. The third port pad on the A side of the rigid FR-4 substrate is welded to the bottom of the second cylinder of the metal cap. The plastic part is installed in the open end of the steel shell in a way that the first cylindrical drawing body and the second cylindrical drawing body are exposed, and the outer edge of the plastic part is matched with the U-shaped opening of the steel shell. On the upper part, the MicroUSB opening part of the plastic part is facing the U-shaped opening part of the steel shell.

The metal cap includes a first cylinder body and a second cylinder body. The upper end of the first cylinder body is closed and the lower end is open. The upper end face of the first cylinder body is a chamfered structure, and the lower end of the first cylinder body is provided with an outward-facing skirt. The cross section of the first cylinder is an isosceles trapezoid with a hollow inside and a small top and a large bottom; the top edge of the second cylinder is connected with the skirt edge of the first cylinder as a whole, and the first cylinder and the The two cylinders are coaxial, the lower end of the second cylinder is open, and the cross-section of the second cylinder is a hollowed-out rectangle; the skirt of the first cylinder is provided with uniformly distributed light-transmitting holes, which are one On the one hand, the LED light can be projected for judgment and indication during charging, and on the other hand, it is also conducive to strengthening the air convection heat dissipation during the charging and discharging process. The bottom of the second cylinder is the part where the metal cap is soldered to the rigid FR-4 substrate. At the same time, the second cylinder of the metal cap can also play a role in supporting the external force of the entire metal cap. The first cylinder of the metal cap is used as the positive terminal of the battery, and the inner cavities of the first cylinder of the metal cap and the second cylinder of the metal cap are used as the storage body for the soldering components mounted on the A surface of the rigid FR-4 substrate , The diameter of the inner cavity of the first cylinder body of the metal cap is set to be larger in the lower part and smaller in the upper part, which is more conducive to the storage of high components. The maximum outer diameter and height of the first cylinder of the metal cap are M1 and H1 respectively, the angle between the outer wall of the first cylinder of the metal cap and the plane of the skirt of the first cylinder is β, and the outer diameter and height of the second cylinder of the metal cap They are M2 and H2 respectively. The wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder, and the thickness of the skirt of the first cylinder are all MH. The plastic parts include a first cylindrical stretched body, a second cylindrical stretched body and a third cylindrical stretched body, the first cylindrical stretched body, the second cylindrical stretched body and the third cylindrical stretched body. The stretching body is coaxial; the first cylindrical stretching body and the second cylindrical stretching body are connected in sequence from top to bottom in a way that the outer walls are flush, and the bottom of the first cylindrical stretching body is beyond the second cylinder stretching body. The inner wall of the extension forms a first support platform; the second cylindrical stretching body and the third cylindrical stretching body are connected in turn from top to bottom in a way that the inner wall is flush, and the bottom of the second cylindrical stretching body exceeds the third The outer wall of the cylindrical drawing body forms a second supporting platform. The top of the first cylindrical drawing body is provided with a metal cap opening, the sides of the second cylindrical drawing body and the third cylindrical drawing body are jointly provided with a laterally placed MicroUSB opening, and the second cylindrical drawing body and The inner wall of the third cylindrical drawing body is provided with two guide grooves with L-shaped cross-section near the two sides of the MicroUSB opening, and the third cylindrical drawing body is provided with a lower edge protruding below the MicroUSB opening. The outer wall of the third cylindrical drawing body is located at the peripheral position of the opening of the MicroUSB and is provided with an outer edge protruding part. The outer diameter of the first cylindrical stretching body of the plastic part is SD1, the inner diameter is SD2, and the height is SJ4; the outer diameter of the second cylindrical stretching body of the plastic part is SD1, the inner diameter is SD4, the height is SJ1-SJ4, and SJ1 is The sum of the heights of the first cylindrical stretched body and the second cylindrical stretched body of the plastic part; the outer diameter of the third cylindrical stretched body is SD3, the inner diameter is SD4, and the height is SJ2; the lower edge of the plastic part protrudes The height is SJ3. The characteristic dimension of the protruding part of the outer edge of the plastic part is SB, which means the width of the protruding part of the outer edge of the plastic part. The characteristic dimensions of the guide groove of the plastic part are SA and SK: SA is the distance between the two mutually parallel planes of the two guide grooves, and SK is the intersection between the two mutually perpendicular planes of the guide groove to the plastic part. distance from the center axis.

The side surface of the open end of the steel shell is provided with a U-shaped opening, and the U-shaped opening cooperates with the outer edge protrusions provided on the outer wall of the plastic part to play the role of installation, guidance and positioning; The U-shaped opening is also a structural feature corresponding to the cooperation between the plastic part MicroUSB opening and the steel shell, and functions as an opening for the MicroUSB interface.

The flexible packaging lithium ion battery is a lithium ion secondary single battery core encapsulated by an aluminum-plastic film. After reshaping the appearance, the reshaped lithium-ion battery forms a slope at its top and bottom ends. The characteristic dimension of the slope is DP, which represents the height drop of the slope on one side of the soft-packed lithium-ion battery. That is, the height difference between the highest point and the lowest point of the slope.

The outline of the rigid FR-4 substrate is a circular flat stretched body, and two relatively symmetrical notch parts, namely the first notch part and the second notch part, are respectively set on the left and right sides, which are set on the side directly below. There is a third notch portion. The setting of the first notch part and the second notch part is to take into account the need to connect multiple small rigid FR-4 The notch is used for interconnection between a plurality of rigid FR-4 substrates. Since the third notch is facing the MicroUSB opening of the plastic part, in order to enhance the strength of the outer edge protruding part of the plastic part, the outer edge protruding part must have an appropriate wall thickness. The wall thickness of the outgoing portion needs to be thinned, which is not conducive to enhancing the strength of the protruding portion along the outer edge of the plastic part. The diameter of the rigid FR-4 substrate is PD and the thickness of the rigid FR-4 substrate is PH. The A side of the rigid FR-4 substrate is soldered with the following components: the second capacitor, the first capacitor, the integrated IC, the protection IC, the third resistor, the second resistor, the LED lamp, the A surface of the rigid FR-4 substrate The third port pad (ie the J3 port) is soldered with a metal cap, and the J3 port is the output port of the discharge. The B side of the rigid FR-4 substrate is soldered with a third capacitor, a first resistor and an inductor, and the fourth port pad (ie the J4 port) on the B side of the rigid FR-4 substrate is soldered with a MicroUSB interface, and the rigid FR- 4. The first port pad (ie, J1 port) and the second port pad (ie, J2 port) on the B side of the substrate respectively represent ports that are electrically connected to the positive and negative terminals of the soft-package lithium-ion battery.

The first cylinder of the metal cap satisfies: 2mm≤M1≤5.5mm; the height H1 satisfies: 1.0mm≤H1≤1.7mm. The lower limit size of M1 is 2mm≤M1 setting, which can ensure that the metal cap has enough contact area for the lithium ion secondary battery to maintain good contact with the external load. It is beneficial to reduce the height H2 of the second cylinder of the metal cap, and the saved height space is used to accommodate high-capacity flexible packaging and flexible packaging lithium-ion batteries; the upper limit size of M1, that is, M1≤5.5mm, is set to meet the requirements of international standards and specifications Otherwise, the diameter may be too large and cannot be matched with the supporting interface of the external load, resulting in poor or inaccessible contact. The lower limit height of H1, that is, the setting of 1.0mm≤H1, is to meet the requirements of international standards. Otherwise, the metal cap may not be able to cooperate with the supporting interface of the external load due to the too low protruding height, resulting in poor or inaccessible contact; the upper limit of H1 The setting of the height, that is, H1≤1.7mm, is to minimize the height space occupied by the metal cap, so as to leave the saved height space for the flexible packaging lithium-ion battery, which is conducive to the large capacity of the battery.

The outer diameter M2 of the second cylinder of the metal cap satisfies: SD2-1.00mm≤M2≤SD2, wherein SD2 is the inner diameter of the first cylindrical drawing body of the plastic part; the height H2 of the second cylinder of the metal cap satisfies: H2=SJ4, wherein SJ4 is the height of the first cylindrical drawing body of the plastic part. The lower limit diameter of M2 is the setting of SD2-1.00mm≤M2, one is to meet the requirements of the second cylinder of the metal cap and the first cylindrical stretched body of the plastic part after the matching installation, the second cylinder of the metal cap is stored in the plastic part. In the inner cavity of the first cylindrical drawing body, there will not be too large gaps to affect the appearance of the battery. Second, the inner cavity of the second cylindrical body of the metal cap is the placement area for components, and the M2 size is too large. Small is not conducive to the placement of components. The upper limit size of M2, that is, the setting of M2≤SD2, is to meet the requirements of the second cylinder of the metal cap and the inner cavity of the first cylindrical drawing body of the plastic part. Otherwise, the second cylinder of the metal cap cannot be installed on the first cylinder of the plastic part. in the inner cavity of a cylindrical drawing body. The setting of H2=SJ4, on the one hand, is to satisfy the installation and cooperation of the metal cap and the plastic part, the first cylinder of the metal cap must be higher than the upper end plane of the first cylindrical drawing body of the plastic part (that is, H2 is not less than SJ4), Otherwise, the effective height of the head of the metal cap in contact with the external load will be lower than the height H1 of the first cylinder, resulting in a situation that cannot meet the standard requirements; on the other hand, in order to minimize the space occupied by the metal cap in the height direction, the height of H2 It cannot be set too high, otherwise it is not conducive to increasing the height of the flexible packaging lithium-ion battery that can be installed, which is not conducive to high capacity, that is, H2 is not larger than SJ4.

In this embodiment, the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the thickness MH of the skirt of the first cylinder satisfy 0.15mm≤MH≤0.5mm. If the thickness is too thin, the strength of the metal cap is insufficient, and it may be deformed during clamping and use; if the wall thickness of the first cylinder and the second cylinder of the metal cap is too thick, it will occupy more rigid FR-4 substrate patches. The area is not conducive to the effective arrangement of other components on the rigid FR-4 substrate.

其中M1为金属盖帽第一筒体的最大外径，MH为金属 盖帽第一筒体的壁厚、第二筒体的壁厚或第一筒体裙边的厚度，Yjmax为硬性FR-4基板A 面即顶面所贴片锡焊元器件的最大高度，a为硬性FR-4基板A面所贴片锡焊的最大高度元器 件的长度，b为硬性FR-4基板A面所贴片锡焊的最大高度元器件的宽度，H2为金属盖帽第 二筒体的高度。夹角β上限尺寸即

的设置，是考虑到硬 性FR-4基板A面所贴片锡焊的最大高度元器件必须完全收纳在金属盖帽第一筒体和第二筒体的内部空腔中，该最大高度元器件不会与金属盖帽发生干涉现象，金属盖帽第一筒体为非 等直径的上小下大结构，如果

则金属盖帽上端内部空 腔直径过小将导致金属盖帽第一筒体与最大高度元器件发生干涉问题而无法安装到位。夹角β 下限尺寸π/2＜β的设置，是为了确保金属盖帽第一筒体为上小下大结构，这即有利于金属盖 帽在国标要求的尺寸范围内形成收纳最大高度的元器件，从而有利于最大高度元器件在高度 方向上更多的收纳在金属盖帽第一筒体中，减少金属盖帽的总体高度，有利于高容量化；同 时，由于金属盖帽的上端是与外部负载接触的地方，上端的直径小于最大直径也有利于避免 金属盖帽上端直径尺寸过大从而影响与外部负载的安装接触。The angle β between the outer wall of the first cylinder of the metal cap and the plane of the skirt of the first cylinder satisfies:

M1 is the maximum outer diameter of the first cylinder of the metal cap, MH is the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the thickness of the skirt of the first cylinder, and Yjmax is the rigid FR-4 substrate The A side is the maximum height of the soldered components on the top surface, a is the length of the maximum height of the soldered components on the A side of the rigid FR-4 substrate, and b is the hard FR-4 substrate on the A side. The maximum height of soldering is the width of the component, and H2 is the height of the second cylinder of the metal cap. The upper limit size of the included angle β is

The setting is to take into account that the components with the maximum height of soldering on the A side of the rigid FR-4 substrate must be completely accommodated in the inner cavity of the first and second cylinders of the metal caps. The maximum height components are not It will interfere with the metal cap. The first cylinder of the metal cap is an unequal diameter upper small and lower large structure. If

Then, if the diameter of the inner cavity at the upper end of the metal cap is too small, the first cylinder of the metal cap will interfere with the component with the maximum height and cannot be installed in place. The setting of the included angle β and the lower limit dimension π/2<β is to ensure that the first cylinder of the metal cap has a small upper and a lower structure, which is beneficial to the metal cap to form a component with the maximum height within the size range required by the national standard. Therefore, it is beneficial for the maximum height components to be stored in the first cylinder of the metal cap in the height direction, reducing the overall height of the metal cap, which is conducive to high capacity; at the same time, since the upper end of the metal cap is in contact with the external load In some places, the diameter of the upper end is smaller than the maximum diameter, which is also beneficial to prevent the diameter of the upper end of the metal cap from being too large to affect the installation contact with the external load.

The outer diameter SD1 of the first cylindrical drawing body and the second cylindrical drawing body of the plastic part satisfies: SD1=GW; the outer diameter SD3 of the third cylindrical drawing body of the plastic part satisfies: SD3=GN. The setting of the outer diameter size above the plastic part is because after the plastic part is installed and matched with the steel shell, the first cylindrical stretching body and the second cylindrical stretching body of the plastic part are located above the open end of the steel shell, and the third cylindrical stretching body of the plastic part is located above the open end of the steel shell. The cylindrical drawing body is located inside the steel shell. The setting of size SD1=GW can satisfy the outer diameter of the entire battery after the plastic part is assembled with the steel case; the setting of size SD3=GN can satisfy the third cylindrical drawing body of the plastic part. It can penetrate deep into the steel shell and achieve a tight fit with the steel shell.

The inner diameter SD4 of the third cylindrical drawing body and the second cylindrical drawing body of the plastic part satisfies: SD3-2.00mm≤SD4≤SD3-1.00mm. This is because the wall thickness (=(SD3-SD4)/2) of the third cylinder drawing body of the plastic part is too thin (less than 0.5mm) and the strength is not enough, so SD3-2.00mm≤SD4; the third cylinder of the plastic part If the wall thickness of the drawing body is too thick (greater than 1mm), the internal cavity of the plastic part will be reduced, and the radial size of the rigid FR-4 substrate will be reduced, which is not conducive to the placement of components, so SD4≤SD3-1.00mm. The inner diameter SD2 of the first cylindrical drawing body of the plastic part satisfies: SD4-4.00mm≤SD2≤SD4-0.50mm. The setting of SD4-4.00mm≤SD2 is to consider that if SD2 is too small, M2 will be too small due to the outer diameter of the second cylinder of the metal cap M2≤SD2, which is not conducive to the placement of components on the A surface of the rigid FR-4 substrate. sheet, because the inner cavity of the second cylinder of the metal cap is the placement area for the components. The setting of SD2≤SD4-0.50mm is due to the fact that the bottom of the second cylinder stretching body exceeds the inner wall of the third cylinder stretching body to form a second support platform, which plays the role of supporting the rigid FR-4 substrate, supporting the platform The width is (SD4-SD2)/2, so the second support platform must have a certain width (not less than 0.25mm) to form a sufficient support area and support capacity. The height SJ4 of the first cylindrical drawing body of the plastic part satisfies: Yjasec+MH≤SJ4≤Yjmax+MH, where MH is the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the first cylinder The thickness of the body skirt, Yjasec is the second height of the A-side of the rigid FR-4 substrate, that is, the top surface of the soldered components, and Yjmax is the A-side of the rigid FR-4 substrate, that is, the top surface of the soldered components. maximum height. The setting of the lower limit of the height of the first cylindrical drawing body of the plastic part, Yjasec+MH≤SJ4, is based on the consideration that the A surface of the rigid FR-4 substrate, that is, the soldered components on the top surface, except for the components with the largest height, must be able to It is accommodated in the cavity of the second cylinder of the metal cap, and the second cylinder of the metal cap and the skirt of the first cylinder must be completely accommodated in the cavity of the first cylindrical drawing body of the plastic part after being assembled with the plastic part. The setting of the upper limit size of the height of the first cylindrical drawing body of the plastic part SJ4≤Yjmax+MH is based on the consideration that the A surface of the rigid FR-4 substrate, that is, the maximum height of the soldered components on the top surface, can have a part of the height stored in the metal. The inner cavity of the first cylindrical body is capped, which is beneficial to reduce the total height of the entire metal cap, and is beneficial to increase the capacity.

The height SJ2 of the third cylindrical drawing body of the plastic part satisfies: 1.5mm≤SJ2≤4.0mm, the third cylindrical drawing body of the plastic part is the part that is assembled with the steel shell, and is also the part of the plastic part and the steel shell. Punch point fixed part. The third cylindrical drawing body of the plastic part completely extends into the inside of the steel shell. After the installation is in place, the open end of the steel shell is clamped on the second supporting platform of the plastic part (the bottom of the second cylindrical drawing body of the plastic part extends beyond the third circle. The outer wall of the cylinder drawing is formed), that is, the second cylindrical drawing body and the first cylindrical drawing body of the plastic part are exposed outside the steel shell. In order to ensure that the plastic part and the steel shell can perform the punching operation and still have good fixing strength, the third cylindrical drawing body of the plastic part must have a certain height, that is, 1.5mm≤SJ2. If SJ2 is too small, the punching point Operation is difficult to implement. However, SJ2 should not be too large, otherwise it will occupy the height space of the battery, which is not conducive to the high capacity of the battery, so SJ2≤4.0mm.

The characteristic size of the plastic part SJ1+SJ2-SJ4 (that is, the sum of the heights of the second cylindrical drawing body and the third cylindrical drawing body of the plastic part) satisfies: PH+YJB≤SJ1+SJ2-SJ4≤PH+YJB +1.00mm, where PH is the thickness of the rigid FR-4 substrate, and YJB is the thickness of the MicroUSB interface. The setting of PH+YJB≤SJ1+SJ2-SJ4 size is based on the consideration that the MicroUSB interface arranged on the B side of the rigid FR-4 substrate is completely accommodated in the second cylindrical stretching body and the third cylindrical stretching body of the plastic part. In the inner cavity of the plastic part, it plays the role of insulation and protection; the setting of SJ1+SJ2-SJ4≤PH+YJB+1.00mm is based on the sum of the heights of the second and third cylindrical stretched bodies of the plastic parts. It should not be too large, otherwise it will occupy the height space of the battery, which is not conducive to the high capacity of the battery.

The height SJ3 of the protruding part on the lower edge of the plastic part satisfies: 0.50mm≤SJ3≤DP, where DP is the height difference of the slope part on one side of the flexible packaging lithium-ion battery (ie the height difference between the highest point and the lowest point of the slope part) . The protruding part on the lower edge of the plastic part plays the role of installation, guiding and positioning and enhancing the strength of the protruding part on the outer edge of the plastic part. If the height of the protruding part on the lower edge is too small, it is not conducive to its function, so 0.50mm≤SJ3; however, , the protruding part of the lower edge of the plastic part is located above the slope part of the flexible packaging lithium-ion battery, and the height of the protruding part of the lower edge of the plastic part should not be too high, otherwise it will cause serious extrusion to the slope part of the flexible packaging lithium-ion battery. Therefore SJ3≤DP.

The characteristic dimensions of the outer edge protrusions and guide grooves of the plastic parts satisfy: SA+0.30mm≤SB≤SA+2.00mm, SD4/2≤SK≤SD3/2-0.30mm, where SB is the outer edge of the plastic part Along the width of the protruding portion, SA is the distance between the two mutually parallel planes of the two guide grooves, and SK is the distance from the intersection between the two mutually perpendicular planes of the guide groove to the center axis of the plastic part. SD3 is the outer diameter of the third cylindrical drawing body of the plastic part, and SD4 is the inner diameter of the third cylindrical drawing body of the plastic part. The setting of SA+0.30mm ≤SB size is to enhance the strength of the outer edge protrusion of the plastic part, especially to overcome the decrease in strength caused by the position of the guide groove of the plastic part; the setting of SB≤SA+2.00mm size is Considering that if the width dimension of the outer edge protrusion is too large, the size of the U-shaped opening of the steel shell will be increased, which will cause the opening of the steel shell to be easily deformed during the assembly process. The setting of SK≤ SD3/2-0.30mm is to meet the requirements of the thinnest wall thickness of the plastic parts corresponding to the guide groove position of the plastic parts (the wall thickness is SD3/2-SK), that is, the thinnest wall thickness is greater than 0.30mm, otherwise the guide The strength of the plastic parts at the groove position is seriously insufficient and the injection molding process is difficult. The setting of SD4/2≤SK size is to consider that if the SK size is too small, the MicroUSB interface will occupy more rigid FR-4 substrate area, which is not conducive to the placement and placement of other components.

The key feature dimensions of the rigid FR-4 substrate meet: SD4-1.00mm≤PD≤SD4-0.10mm, 0.4mm≤PH≤1mm, where PD is the diameter of the rigid FR-4 substrate, and PH is the diameter of the rigid FR-4 substrate Thickness, SD4 is the inner diameter of the third cylindrical drawing body and the second cylindrical drawing body of the plastic part. In order to realize that the rigid FR-4 substrate can be better assembled into the inner cavity formed by the second cylindrical drawing body and the third cylindrical drawing body of the plastic part, the diameter PD of the rigid FR-4 substrate should not be too large, that is, PD ≤SD4-0.10mm, otherwise it is difficult to assemble; at the same time, in order to facilitate the arrangement and placement of components on the rigid FR-4 substrate, it is necessary to increase the effective patch area of the rigid FR-4 substrate as much as possible, so the rigid FR-4 substrate The diameter of PD cannot be too small, that is, SD4-1.00mm≤PD. The thickness of the rigid FR-4 substrate satisfies 0.4mm≤PH≤1mm. If the thickness is too thin, the rigidity of the rigid FR-4 substrate will be insufficient, resulting in serious deformation of the rigid FR-4 substrate when the MicroUSB interface is subjected to the insertion and extraction force of the plug wire. fracture; if the thickness is too thick, the rigid FR-4 substrate occupies more height space, which is not conducive to the increase of battery capacity.

The height GKH of the steel shell satisfies: GKH≤H-H1-SJ1, where H is the total height of the lithium ion secondary battery, H1 is the height of the first cylinder of the metal cap, and SJ1 is the first cylinder stretch of the plastic part The sum of the heights of the body and the second cylindrical drawing body.

The height DXH of the flexible packaging lithium-ion battery satisfies: DXH≤GKH-SJ2-GKDH, wherein GKH is the height of the steel shell, SJ2 is the height of the third cylindrical drawing body of the plastic part, and GKDH is the thickness of the bottom of the steel shell.

The lithium-ion secondary battery is realized in the following manner:

First, weld the A end of the positive wire of the cell to the first port pad J1 (ie, J1 port) on the B side of the rigid FR-4 substrate, and weld the A end of the negative wire of the cell to the second port of the B side of the rigid FR-4 substrate. Plate J2 (ie J2 port) is soldered.

The second is to solder the rigid FR-4 substrate of all components (wherein the A side of the rigid FR-4 substrate is soldered with a second capacitor, a first capacitor, an integrated IC, a protection IC, a third resistor, a second resistor, LED Lamp, the J3 port on the A side of the rigid FR-4 substrate is soldered with a metal cap (that is, the bottom of the second cylinder of the metal cap is welded to the J3 port on the A side of the rigid FR-4 substrate), and the B side of the rigid FR-4 substrate is tinned The third capacitor, the first resistor and the inductor are soldered, and the J4 port on the B side of the rigid FR-4 substrate is soldered with a MicroUSB interface) with the A side up and the B side down to the second cylindrical drawing body of the plastic part In the inner cavity formed by the third cylindrical drawing body, the MicroUSB interface is matched with the MicroUSB opening on the side of the plastic part (that is, the opening end of the MicroUSB interface is matched with the MicroUSB opening of the plastic part), and it is rigid after being installed in place. The A side of the FR-4 substrate is clamped on the first support platform of the plastic part (the first support platform is formed by the bottom of the first cylindrical drawing body extending beyond the inner wall of the second cylindrical drawing body); the second cylindrical body of the metal cap is stored In the inner cavity of the first cylindrical drawing body of the plastic part, the first cylindrical body of the metal cap protrudes from the upper end plane of the first cylindrical drawing body of the plastic part.

The third is to weld the B end of the positive wire of the cell to the positive end of the flexible packaged lithium ion battery, and the B end of the negative lead of the battery to the negative end of the flexible packaged lithium ion battery.

The fourth is to match the protruding part of the lower edge of the plastic part with the edge end face of the slope of the flexible packaging lithium ion battery, and then put the flexible packaging lithium ion battery into the steel shell from the open end of the steel shell, wherein the upper slope of the flexible packaging lithium ion battery The front end of the protruding part of the lower edge of the plastic part is extended into the steel shell, and then the outer edge protruding part set on the outer wall of the plastic part is aligned and matched with the steel part. The U-shaped opening of the shell is used as a positioning, and the lower edge protrusion of the plastic part and the third cylindrical drawing body of the plastic part are inserted into the steel shell in turn. On the supporting platform (the second supporting platform is formed by the bottom of the second cylindrical drawing body of the plastic part exceeding the outer wall of the third cylindrical drawing body), that is, the first cylindrical drawing body and the second cylindrical drawing body of the plastic part are exposed. Outside the steel case, the MicroUSB opening of the plastic part faces the U-shaped opening of the steel case.

Finally, steel is used to punch the junction of the third cylindrical drawing body of the plastic part and the steel shell, and the steel shell is deformed and embedded in the wall of the plastic part to realize the fixation of the plastic part and the steel shell.

The above five steps complete the fabrication of the lithium ion secondary battery.

Compared with the prior art, the lithium ion secondary battery of the present invention has the following advantages:

(1) The integration process is simple. The invention adopts a single rigid FR-4 substrate for each lithium-ion secondary battery, and solders all components, metal caps, and MicroUSB interface patches on the surface thereof, thereby eliminating the need for complex two or more rigid FR-4 substrates. -4 The substrate splicing process does not require additional installation, positioning and fixing operations on the metal cap. The arrangement of the protruding part on the outer edge of the plastic part, the protruding part on the lower edge of the plastic part and the U-shaped opening part of the steel shell greatly simplifies the operation requirements of the integrated installation process, and can achieve rapid assembly and positioning without designing complicated fixtures. .

(2) High integration and high reliability. Components are arranged on the A and B sides of the rigid FR-4 substrate, and the metal cap and the MicroUSB interface are directly soldered on the surface. The internal cavity is fully utilized to place various parts to improve the utilization of space, which greatly reduces the precious space of the battery occupied by the structural parts that do not contribute to the capacity, thus contributing to the high capacity of the battery. At the same time, the arrangement of the protruding part on the outer edge and the protruding part on the lower edge of the plastic part is conducive to enhancing the anti-stamping ability of the plastic part, reducing the deformation of the plastic part when the steel is punched against the steel shell, and improving the effect of the punching point, which is very It is beneficial to improve the reliability of the entire battery structure. The arrangement of the structural features of a single rigid FR-4 substrate, the outer edge protrusions of the plastic parts, the lower edge protrusions of the plastic parts, and the U-shaped opening of the steel shell is beneficial to simplify the integrated installation process, improve the integration efficiency, and improve the structural characteristics. reliability.

(3) High integration efficiency and diverse functions. Each lithium ion secondary battery of the present invention adopts a rigid FR-4 substrate, which not only saves space, but also avoids the low efficiency of assembling multiple rigid FR-4 substrates; The setting of the part greatly improves the difficulty of installation, so that the assembly process of the plastic part and the steel shell can be carried out efficiently. The plastic part is used as the storage and support body of the rigid FR-4 substrate, the snap-fit structure of the rigid FR-4 substrate, the output guide body of the open end of the MicroUSB interface, and the rigid FR-4 substrate B stored in the internal cavity of the plastic part Insulation protection body for surface-mount soldering components (such as MicroUSB interface, inductor, first resistor, etc.), structure body for connection and fixation with steel shell, structure body for assembling and matching with U-shaped opening of steel shell, and metal shell The structure body that is assembled and matched with the cap, the support body that engages with the bumps of the steel shell; the functional reuse, three-dimensional space layout and assembly form of plastic parts, metal caps, steel shells and other parts, greatly reducing the occupation of structural parts that do not contribute to capacity space, greatly improving the efficiency of the integration, so that the battery capacity can be higher. At the same time, the lithium ion secondary battery of the present invention integrates the multi-integrated functions of its own MicroUSB charging interface, constant voltage output, charging management and protection, and overcharge, overdischarge, and overcurrent protection.

The lithium ion secondary battery of the invention has novel structure, simple manufacturing process and high product reliability. The lithium ion secondary battery of the present invention takes into account the requirements of multifunctional integration, structural reliability, process operability and simplicity.

Description of drawings

Fig. 1 is the overall outline schematic diagram of the lithium ion secondary battery of Example 1;

Fig. 2 is the schematic diagram of the structure explosion of the lithium ion secondary battery of Example 1;

Fig. 3 (a) is the 3D structure schematic diagram of the metal cap of Example 1;

Fig. 3 (b) is the front view of the metal cap of embodiment 1;

Figure 4(a) is a schematic diagram 1 of the 3D structure of the plastic part of Example 1;

Figure 4(b) is a second schematic diagram of the 3D structure of the plastic part of Example 1;

Figure 4(c) is a front view of the plastic part of Example 1;

Figure 4(d) is a bottom view of the plastic part of Example 1;

5 is a 3D structural schematic diagram of the steel shell of Example 1;

6 is a schematic diagram of the 3D structure of the flexible packaging lithium-ion battery of Example 1;

7 is a schematic circuit diagram of Embodiment 1;

Figure 8(a) is a schematic diagram of the placement of components on the A side of the rigid FR-4 substrate of Example 1;

Figure 8(b) is a schematic diagram of the position of the B-side component placement on the rigid FR-4 substrate of Example 1;

Fig. 9 (a) is the assembly 3D structure schematic diagram of embodiment 1 metal cap, rigid FR-4 substrate, MicroUSB interface, cell negative lead, cell positive lead;

Fig. 9(b) is a schematic view of the assembled half-section 3D structure of the plastic part, the metal cap, the rigid FR-4 substrate, the MicroUSB interface, the negative electrode wire of the battery cell, and the positive electrode wire of the battery cell in Example 1;

Fig. 9 (c) is the assembly half-section 3D structure schematic diagram of embodiment 1 flexible packaging lithium ion battery, plastic part, metal cap, rigid FR-4 substrate, MicroUSB interface, battery core negative lead, battery positive lead;

10 is a graph showing the relationship between charging voltage-charging current-charging capacity of the lithium-ion secondary battery in Example 1;

11 is a graph showing the relationship between discharge voltage-discharge current-discharge capacity of the lithium ion secondary battery of Example 1. FIG.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Example 1

Taking the specific production of a cylindrical lithium-ion secondary battery with a constant voltage output with its own MicroUSB charging interface as an example, to further illustrate the implementation of the structure and function of the lithium-ion secondary battery, and explain the lithium-ion secondary battery. The realization method of high integration efficiency, high capacity and high reliability.

A lithium-ion secondary battery is cylindrical (its overall dimensions must meet the requirements of the R06 model size specification required by the "IEC60086-2:2011" standard), and its requirements are: battery diameter≤14.50mm, battery height H≤ 50.50mm, the battery has the function of charging with its own MicroUSB interface; it has the function of charging management; it has the functions of charging protection and discharge protection (discharge undervoltage protection, charging overvoltage protection, charging overcurrent protection, discharge overcurrent protection, short circuit protection, overtemperature protection protection); the battery has the output function of constant voltage 1.50V±0.10V and continuous 500mA current. As shown in FIG. 1 and FIG. 2 , the lithium-ion secondary battery includes a soft-packed lithium-ion battery cell 1, a steel case 2, and components 3 (including an integrated IC, a protection IC, a first resistor, a second resistor, a third resistor, First capacitor, second capacitor, third capacitor, inductor, LED lamp, etc.), plastic parts 4, rigid FR-4 substrate 5, metal cap 6, battery negative lead 7, battery positive lead 8 and MicroUSB interface 9, The flexible packaged lithium-ion battery cell 1 in this embodiment is a lithium-ion secondary single-cell battery cell packaged with an aluminum-plastic film as a shell, the model is 13430 (diameter 13.00±0.20mm, height 43.00 ⁺⁰ _-1.0mm ), nominal voltage is 3.7V, the capacity is 800mAh; the battery shell is steel shell 2, its outer diameter is GW=13.90±0.05mm, its inner diameter is GN=13.50±0.05mm, its height is GKH=46.95±0.05mm, and its bottom thickness is GKDH=0.30 ±0.05mm; the flexible packaged lithium-ion battery 1 is placed in the steel shell 2, and the positive and negative terminals of the flexible-packaged lithium-ion battery 1 pass through the positive electrode wire 8 of the battery cell, the negative electrode wire 7 of the battery cell and the rigid FR-4 substrate 5 respectively. On the B side, the first port pad J1, namely the J1 port, and the second port pad J2, namely the J2 port, are connected correspondingly. The third cylindrical stretched body of the plastic part 4 and the lower edge protruding part are inserted into the open end of the steel shell 2, and the first cylindrical stretched body and the second cylindrical stretched body of the plastic part 4 are exposed in the steel shell 2, that is, the plastic part 4 is installed in the open end of the steel shell 2 in such a way that the first cylindrical drawing body and the second cylindrical drawing body are exposed; The U-shaped opening part is matched, that is, the outer edge protrusion of the plastic part 4 is matched and clamped on the U-shaped opening part of the steel shell 2, and the MicroUSB opening of the plastic part 4 is facing the U-shaped opening part of the steel shell 2; The steel shell 2 is embedded and fixed with the plastic parts 4 by punching out the bumps; the components 3 are soldered on the A and B sides of the rigid FR-4 substrate 5, and the MicroUSB interface 9 is soldered on the rigid FR-4 substrate 5. On the B side, the rigid FR-4 substrate 5 on which the components are welded is installed in the inner cavity of the plastic part 4 with the A side up and the B side down, and the open end of the MicroUSB interface 9 is matched with the plastic part 4. Inside the MicroUSB opening. The metal cap 6 is soldered to the third port pad J3 on the A side of the rigid FR-4 substrate 5 through the bottom of the second cylinder, namely the J3 port, and the second cylinder of the metal cap is accommodated in the first cylinder of the plastic part. In the inner cavity of the extension body, the first cylindrical body of the metal cap 6 protrudes from the upper end plane of the first cylindrical extension body of the plastic part 4 .

As shown in FIG. 3( a ), the metal cap 6 includes a first cylinder 601 and a second cylinder 602 . The upper end of the first cylinder 601 is closed and the lower end is open. The upper end surface of the first cylinder 601 is chamfered. The lower end of the first cylinder 601 is provided with an outwardly facing skirt 603, the top edge of the second cylinder 602 is connected with the edge of the skirt 603 of the first cylinder 601 as a whole, and the first cylinder 601 and the second cylinder are 602 is a coaxial line, and the lower end of the second cylindrical body 602 is open. The skirt 603 of the first cylinder 601 is provided with uniformly distributed light-transmitting holes 604. On the one hand, the light-transmitting holes can play the role of projecting LED lights for judgment and indication during charging, and on the other hand, it is also conducive to strengthening the charging and discharging process. air convection cooling. The bottom of the second cylinder 602 is the part where the metal cap 6 is soldered to the rigid FR-4 substrate 5, and the second cylinder of the metal cap can also play a role of supporting the external force of the entire metal cap. Figure 3(b) shows the key feature dimensions of the metal cap 6. The maximum outer diameter and height of the first cylinder of the metal cap are M1 and H1, respectively, and the angle between the outer wall of the first cylinder of the metal cap and the plane of the skirt of the first cylinder is β, and the outer diameter and height of the second cylinder of the metal cap are M2 and H2, respectively. The wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder, and the thickness of the skirt of the first cylinder are all MH. In Embodiment 1, the above key feature sizes of the metal cap are set as follows: M1=5.40±0.05mm, H1=1.50±0.05mm, M2=11.50±0.05mm, H2=0.95±0.05mm, MH=0.25±0.05mm , β = 1.867 (radians).

As shown in FIGS. 4( a ) and 4 ( b ), the plastic part 4 includes a first cylindrical drawing body 401 , a second cylindrical drawing body 402 and a third cylindrical drawing body 403 , the first cylindrical drawing body 403 . The stretching body 401, the second cylindrical stretching body 402, and the third cylindrical stretching body 403 are coaxial; The top and bottom are connected as a whole, and the bottom of the first cylindrical stretching body 401 extends beyond the inner wall of the second cylindrical stretching body 402 to form a first support platform 409; the second cylindrical stretching body 402 and the third cylindrical stretching body 403 are connected in sequence from top to bottom in a way that the inner wall is flush, and the bottom of the second cylindrical stretching body 402 extends beyond the outer wall of the third cylindrical stretching body 403 to form a second supporting platform 410 . The top of the first cylindrical stretched body 401 is provided with a metal cap opening 404, the sides of the second cylindrical stretched body 402 and the third cylindrical stretched body 403 are jointly provided with a laterally placed MicroUSB opening 405, and the second circular Two L-shaped guide grooves 408 are provided on the inner walls of the cylindrical drawing body 402 and the third cylindrical drawing body 403 near the two sides of the MicroUSB opening 405, and the third cylindrical drawing body 403 is close to the MicroUSB A lower edge protruding portion 407 is provided below the opening portion 405 , and an outer edge protruding portion 406 is provided on the outer wall of the third cylindrical stretching body 403 at a peripheral position of the MicroUSB opening portion. Figures 4(c) and 4(d) show some key feature dimensions of the plastic part. The outer diameter of the first cylindrical drawing body of the plastic part is SD1, the inner diameter is SD2, and the height is SJ4; the second cylinder of the plastic part has a height of SJ4. The outer diameter of the stretched body is SD1, the inner diameter is SD4, and the height is SJ1-SJ4. SJ1 is the sum of the heights of the first cylindrical stretched body and the second cylindrical stretched body of the plastic part; the third cylindrical stretched body The outer diameter of the plastic part is SD3, the inner diameter is SD4, and the height is SJ2; the height of the protruding part on the lower edge of the plastic part is SJ3. The characteristic dimension of the protruding part of the outer edge of the plastic part is SB, which means the width of the protruding part of the outer edge of the plastic part. The characteristic dimensions of the guide groove of the plastic part are SA and SK: SA is the distance between the two mutually parallel planes of the two guide grooves, and SK is the intersection between the two mutually perpendicular planes of the guide groove to the plastic part. distance from the center axis. In Example 1, the dimensions of the above key features of the plastic parts are set as follows: SD1=13.90±0.05mm, SD2=11.50±0.05mm, SD3=13.50±0.05mm, SD4=12.10±0.05mm, SJ1=1.80±0.05mm , SJ2=2.40±0.05mm, SJ3=1.30±0.05mm, SJ4=0.95±0.05mm, SA=7.80±0.05mm, SK=6.45±0.05mm, SB=9.00±0.05mm.

As shown in FIG. 5 is a schematic diagram of the structure of the steel shell of the present embodiment. A U-shaped opening 201 is provided on the side surface of the open end of the steel shell 2 . At the same time, since the outer edge protrusion 406 of the plastic part is set at the position around the MicroUSB opening 405, the U-shaped opening 201 is also the plastic part MicroUSB opening 405 and the microUSB opening part 405. The steel shell cooperates with the corresponding structural features and functions as an opening for the MicroUSB interface 9 .

FIG. 6 is a schematic diagram of the 3D structure of the flexible packaged lithium-ion battery 1 of the present embodiment. The flexible-packaged lithium-ion battery is a lithium-ion secondary single-cell battery packaged with an aluminum-plastic film as a shell. The side surface of the lithium-ion battery , The top and bottom ends have hot-melt edges produced by sealing, and the appearance is reshaped after packaging. The reshaped lithium-ion battery forms a slope 101 at its top and bottom ends. The characteristic size of the slope is is DP, which represents the height difference of the slope part on one side of the flexible package lithium ion battery, that is, the height difference between the highest point and the lowest point of the slope part. In this embodiment, the characteristic dimension is DP=2.50mm.

As shown in Figure 7 is the circuit schematic diagram of this embodiment, the integrated IC is U2 (model XS5301), the first resistor R1 (the specification is 0.4Ω±1%), and the second resistor R2 (the specification is 1K±1%) , the third resistor R3 (the specification is 1.1K±1%), the inductance L1 (model: 2.2uH/1.5A), the LED lamp D1 (the model is HL0402USR), the first capacitor C1 (the specification is 0.1uF, 10V), the first The second capacitor C2 (specification is 22μF, 10V), the third capacitor C3 (specification is 22μF, 10V), the protection IC is U1 (the model is CT2105), and there are J1 ports (that is, the first port pad J1), J2 ports ( That is, the second port pad J2), the J3 port (that is, the third port pad J3), and the J4 port (that is, the fourth port pad J4, which serves as the MicroUSB interface pad and the positioning hole). Among them, the J1 port and the J2 port respectively represent the ports that are electrically connected to the positive and negative terminals of the flexible packaging lithium-ion battery, and the J3 port represents the soldering pad to the bottom of the second cylinder of the metal cap, and the J3 port Is the discharge output port. The J4 port represents the soldering pad and positioning hole with the MicroUSB port, which is the charging input port.

In this embodiment, the protection IC, namely U1 (model CT2105), is used for battery charging and discharging process protection, mainly including: overcharge protection (overcharge detection voltage is 4.275±0.050V, overcharge release voltage is 4.075±0.025 V, overcharge voltage detection delay time is 0.96～1.40s), overdischarge protection (overdischarge detection voltage is 2.500±0.050V, overdischarge release voltage is 2.900±0.025V, overdischarge voltage detection delay time is 115～173mS) , Overcharge current protection (overcharge current detection is 2.1~3.9A, overcharge current detection delay time is 8.8~13.2mS), overdischarge current protection (overdischarge current detection is 2.5~4.5A, overdischarge current detection delay time 8.8 ~ 13.2mS), short circuit protection (load short circuit detection voltage is 1.20 ~ 1.30V, load short circuit detection delay is 288 ~ 432μS).

In this embodiment, the integrated IC, namely U2 (model XS5301), is used for battery charging management, charging process protection, and constant voltage output, mainly including: charging management (the adapter voltage input is 4.5V to 6.5V, the IC can provide 4.2 V±1% charging voltage to charge the battery; the maximum charging current 1C can reach 700mA; the charging current is set by the third resistor R3 in Figure 7, the maximum charging current corresponding to R3=1.1K in this embodiment is 568mA; the charging current is reduced to 0.1C when charging is terminated), charging protection (the battery voltage is lower than 2.9V using trickle charging mode; the charging process has overcurrent protection, short circuit protection, temperature protection), constant voltage output (1.5MHz constant frequency output operation; can be up to 1.5 A current output works; constant output voltage is 1.50V; overcurrent protection, short circuit protection, temperature protection, low voltage lock protection).

As shown in FIG. 8( a ), the outline of the rigid FR-4 substrate 5 in this embodiment is a circular flat stretched body, and two symmetrical notches, namely first notches, are respectively provided on the left and right sides. 501 and the second notch portion 502, a third notch portion 503 is provided on the side directly below. The setting of the first notch portion 501 and the second notch portion 502 is based on the consideration that when the rigid FR-4 substrate 5 is used for component chip production and processing, a plurality of small rigid FR-4 substrates need to be connected for connection. 501 and the second notch portion 502 are used for interconnection between the plurality of rigid FR-4 substrates 5 . Since the third notch part 503 is facing the MicroUSB opening 405 of the plastic part, in order to enhance the strength of the outer edge protruding part 406 of the plastic part, the outer edge protruding part 406 must have an appropriate wall thickness. If the third notch part 503 is not provided , the wall thickness of the outer edge protruding portion 406 needs to be reduced, which is not conducive to enhancing the strength of the outer edge protruding portion 406 of the plastic part. The diameter of the rigid FR-4 substrate is PD, and the thickness of the rigid FR-4 substrate is PH. The key feature dimensions of the rigid FR-4 substrate in this embodiment are set as follows: PD=11.90±0.05mm, PH=0.60±0.05mm. As shown in Fig. 8(a), the A-side of the rigid FR-4 substrate 5 is soldered with the following components: a second capacitor, a first capacitor, an integrated IC, a protection IC, a third resistor, a second resistor, LED lamp, the third port pad (ie J3 port) on the A side of the rigid FR-4 substrate is soldered with a metal cap 6, and the J3 port is the output port of discharge. As shown in Figure 8(b), the B side of the rigid FR-4 substrate is soldered with a third capacitor, a first resistor, and an inductor, and the fourth port pad (ie, the J4 port) is soldered with a MicroUSB interface 9, and the rigid The first port pad (that is, the J1 port) and the second port pad (that is, the J2 port) on the B side of the FR-4 substrate respectively represent the ports that are electrically connected to the positive and negative terminals of the flexible package lithium-ion battery 1. . The first cylinder body of the metal cap in this embodiment satisfies: 2mm≤M1 (=5.40mm)≤5.5mm; and the height H1 satisfies: 1.0mm≤H1 (=1.50mm)≤1.7mm. The lower limit size of M1 is 2mm≤M1 setting, which can ensure that the metal cap 6 has enough contact area for the lithium ion secondary battery to maintain good contact with the external load, and the increase in the size of M1 is conducive to accommodating components with higher heights. Therefore, it is beneficial to reduce the height H2 of the second cylinder 602 of the metal cap, and the saved height space is used to accommodate the high-capacity flexible-packed and flexible-packed lithium-ion battery cell 1; Otherwise, the diameter may be too large and cannot be matched with the supporting interface of the external load, resulting in poor or inaccessible contact. The setting of the lower limit height of H1, that is, 1.0mm≤H1, is in order to meet the requirements of international standards. Otherwise, it is possible that the metal cap 6 cannot be matched with the supporting interface of the external load due to the too low protrusion height, resulting in poor or inaccessible contact; H1 The setting of the upper limit height, that is, H1≤1.7mm, is to minimize the height space occupied by the metal cap 6, so that the saved height space is reserved for the flexible packaging lithium-ion battery 1, which is beneficial to the increase of the battery capacity.

The outer diameter M2 of the second cylinder of the metal cap in this embodiment satisfies: SD2-1.00mm(=11.50-1.00=10.50mm)≤M2(=11.50mm)≤SD2(=11.50mm), wherein SD2 is the first The inner diameter of a cylindrical stretched body; the height H2 of the second cylindrical body of the metal cap satisfies: H2 (=0.95mm)=SJ4 (=0.95mm), where SJ4 is the height of the first cylindrical stretched body of the plastic part. The lower limit diameter of M2 is the setting of SD2-1.00mm≤M2, one is to meet the requirements of the second cylinder of the metal cap and the first cylindrical stretched body of the plastic part after the matching installation, the second cylinder of the metal cap is stored in the plastic part. In the inner cavity of the first cylindrical drawing body, there will not be too large gaps to affect the appearance of the battery. Second, the inner cavity of the second cylindrical body of the metal cap is the placement area for components, and the M2 size is too large. Small is not conducive to the placement of components. The upper limit size of M2, that is, the setting of M2 ≤ SD2, is to meet the requirement that the second cylinder of the metal cap is matched with the inner cavity of the first cylindrical drawing body of the plastic part, otherwise the second cylinder of the metal cap cannot be installed to the first cylinder of the plastic part. in the inner cavity of a cylindrical drawing body. The setting of H2=SJ4, on the one hand, is to satisfy the installation and cooperation of the metal cap and the plastic part, the first cylinder of the metal cap must be higher than the upper end plane of the first cylindrical drawing body of the plastic part (that is, H2 is not less than SJ4), Otherwise, the effective height of the head of the metal cap in contact with the external load will be lower than the height H1 of the first cylinder, resulting in a situation that cannot meet the standard requirements; on the other hand, in order to minimize the space occupied by the metal cap in the height direction, the height of H2 It cannot be set too high, otherwise it is not conducive to increasing the height of the flexible packaging lithium-ion battery that can be installed, which is not conducive to high capacity, that is, H2 is not larger than SJ4.

In this embodiment, the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the thickness MH of the skirt of the first cylinder satisfy 0.15mm≤MH(=0.25mm)≤0.5mm. The wall thickness of the second cylinder is too thin, and the strength of the metal cap is insufficient, which may be deformed during clamping and use; if the wall thickness of the first cylinder and the second cylinder of the metal cap is too thick, it occupies more rigid FR -4 substrate patch area, which is not conducive to the effective arrangement of other components on the rigid FR-4 substrate.

其中 M1为金属盖帽第一筒体601的最大外径，MH为金属盖帽第一筒体601的壁厚、第二筒体的 602壁厚或第一筒体裙边603的厚度，Yjmax为硬性FR-4基板A面即顶面所贴片锡焊元器件 的最大高度，a为硬性FR-4基板A面所贴片锡焊的最大高度元器件的长度，b为硬性FR-4基板A面所贴片锡焊的最大高度元器件的宽度(本实施例硬性FR-4基板A面即顶面所贴片锡焊的最大高度元器件为保护IC即U1，其高度为Yjmax＝1.35mm，长度为a＝3mm，宽度为 b＝3mm)，H2为金属盖帽第二筒体的高度。夹角β上限尺寸即

的设置，是考虑到硬性FR-4基板A面所贴片锡焊的最大 高度元器件必须完全收纳在金属盖帽第一筒体和第二筒体的内部空腔中，该最大高度元器件 不会与金属盖帽发生干涉现象，金属盖帽第一筒体为非等直径的上小下大结构，如果

则金属盖帽上端内部空腔直径过小将导致金属盖帽第一 筒体与最大高度元器件发生干涉问题而无法安装到位。夹角β下限尺寸π/2＜β的设置，是为 了确保金属盖帽第一筒体为上小下大结构，这即有利于金属盖帽在国标要求的尺寸范围内形 成收纳最大高度的元器件，从而有利于最大高度元器件在高度方向上更多的收纳在金属盖帽 第一筒体中，减少金属盖帽的总体高度，有利于高容量化；同时，由于金属盖帽的上端是与 外部负载接触的地方，上端的直径小于最大直径也有利于避免金属盖帽上端直径尺寸过大从 而影响与外部负载的安装接触。In this embodiment, the angle β between the outer wall of the first cylinder of the metal cap and the plane of the skirt of the first cylinder satisfies:

M1 is the maximum outer diameter of the first cylinder 601 of the metal cap, MH is the wall thickness of the first cylinder 601 of the metal cap, the wall thickness of the second cylinder 602 or the thickness of the skirt 603 of the first cylinder, and Yjmax is the rigidity The A side of the FR-4 substrate is the maximum height of the soldered components mounted on the top surface, a is the length of the maximum height of the soldered components mounted on the A side of the rigid FR-4 substrate, and b is the rigid FR-4 substrate A The width of the component with the maximum height of soldering on the surface (the A side of the rigid FR-4 substrate in this embodiment, that is, the maximum height component that is soldered on the top surface is the protection IC, that is, U1, and its height is Yjmax=1.35mm , the length is a=3mm, the width is b=3mm), and H2 is the height of the second cylinder of the metal cap. The upper limit size of the included angle β is

The setting is to consider that the components with the maximum height of soldering on the surface A of the rigid FR-4 substrate must be completely accommodated in the inner cavities of the first cylinder and the second cylinder of the metal cap, and the maximum height components are not It will interfere with the metal cap. The first cylinder of the metal cap is an unequal diameter upper small and lower large structure. If

Then, if the diameter of the inner cavity at the upper end of the metal cap is too small, the first cylinder of the metal cap will interfere with the component with the maximum height and cannot be installed in place. The setting of the angle β lower limit size π/2<β is to ensure that the first cylinder of the metal cap has a small upper and a lower structure, which is conducive to the formation of the metal cap within the size range required by the national standard to accommodate components with the maximum height. Therefore, it is beneficial for the maximum height components to be stored in the first cylinder of the metal cap in the height direction, reducing the overall height of the metal cap, which is conducive to high capacity; at the same time, since the upper end of the metal cap is in contact with the external load In some places, the diameter of the upper end is smaller than the maximum diameter, which is also beneficial to prevent the diameter of the upper end of the metal cap from being too large to affect the installation contact with the external load.

The outer diameter SD1 of the first cylindrically drawn body and the second cylindrically drawn body of the plastic part in this embodiment satisfies: SD1 (=13.90mm) =GW (=13.90mm); the plastic part is stretched by the third cylinder The outer diameter SD3 of the body satisfies: SD3 (=13.50 mm)=GN (=13.50 mm). The setting of the outer diameter size above the plastic part is because after the plastic part is installed and matched with the steel shell, the first cylindrical stretching body and the second cylindrical stretching body of the plastic part are located above the open end of the steel shell, and the third cylindrical stretching body of the plastic part is located above the open end of the steel shell. The cylindrical drawing body is located inside the steel shell. The setting of size SD1=GW can satisfy the outer diameter of the entire battery after the plastic part is assembled with the steel case; the setting of size SD3=GN can satisfy the third cylindrical drawing body of the plastic part. It can penetrate deep into the steel shell and achieve a tight fit with the steel shell. The inner diameter SD4 of the third cylindrical drawing body and the second cylindrical drawing body of the plastic part in this embodiment satisfies: SD3-2.00mm (=13.50-2.00=11.50mm)≤SD4 (=12.10mm)≤SD3-1.00mm (=13.50-1.00=12.50mm). This is because the wall thickness (=(SD3-SD4)/2) of the third cylindrical drawing body 403 of the plastic part is too thin (less than 0.5mm) and the strength is not enough, so SD3-2.00mm≤SD4; If the wall thickness of the cylinder drawing body 403 is too thick (greater than 1mm), the internal cavity of the plastic part will be reduced, and the radial dimension of the rigid FR-4 substrate 5 will be reduced, which is not conducive to the placement of components and patches, so SD4 ≤ SD3- 1.00mm. The inner diameter SD2 of the first cylindrical drawing body 401 of the plastic part satisfies: SD4-4.00mm (=12.10=4.00=8.10mm)≤SD2 (=11.50mm)≤SD4-0.50mm (=12.10-0.50=11.60mm). The setting of SD4-4.00mm≤SD2 is to consider that if SD2 is too small, M2 will be too small due to the outer diameter of the metal cap second cylinder 602 M2≤SD2, which is not conducive to the rigid FR-4 substrate A surface components The patch is arranged because the inner cavity of the second cylinder 602 of the metal cap is the placement area for the components. The setting of SD2≤SD4-0.50mm is because the bottom of the second cylindrical drawing body 402 extends beyond the inner wall of the third cylindrical drawing body 403 to form a second supporting platform 410, and the second supporting platform serves to support the rigid FR-4 substrate. Function, the width of the support platform is (SD4-SD2)/2, so the second support platform must have a certain width (not less than 0.25mm) to form a sufficient support area and support capacity.

The height SJ4 of the first cylindrical drawing body of the plastic part in this embodiment satisfies: Yjasec+MH(=0.60+0.25=0.85mm)≤SJ4(=0.95mm)≤Yjmax+MH(=1.35+0.25=1.60mm), Where MH is the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the thickness of the skirt of the first cylinder, and Yjasec is the surface A of the rigid FR-4 substrate, that is, the thickness of the soldered components mounted on the top surface. The second height (the A surface of the rigid FR-4 substrate, that is, the second highest component of the solder element on the top surface of the rigid FR-4 substrate, is the integrated IC, namely U2, and its height is Yjasec=0.60mm), and Yjmax is rigid FR-4 The A side of the substrate is the maximum height of the components soldered on the top surface. The setting of the lower limit of the height of the first cylindrical drawing body of the plastic part, Yjasec+MH≤SJ4, is based on the consideration that the A surface of the rigid FR-4 substrate, that is, the soldered components on the top surface, except for the components with the largest height, must be able to It is accommodated in the cavity of the second cylinder 602 of the metal cap, and the second cylinder of the metal cap and the skirt of the first cylinder must be completely accommodated in the cavity of the first cylindrical drawing body of the plastic part after being assembled with the plastic part. The setting of the upper limit size SJ4 ≤ Yjmax+MH of the first cylindrical drawing body of the plastic part is to take into account that the A side of the rigid FR-4 substrate, that is, the maximum height of the soldered components on the top side, can have a part of the height stored in the metal. Cap the inner cavity of the first cylindrical body, which is beneficial to reduce the total height of the entire metal cap, and is beneficial to increase the capacity.

The height SJ2 of the third cylindrical drawing body of the plastic part in this embodiment satisfies: 1.5mm≤SJ2(=2.40mm)≤4.0mm, the third cylindrical drawing body of the plastic part is the part that is assembled with the steel shell, and it is also The part where the plastic parts and the steel shell are punched and fixed. The third cylindrical drawing body of the plastic part completely extends into the inside of the steel shell. After the installation is in place, the open end of the steel shell is clamped on the second supporting platform of the plastic part (the bottom of the second cylindrical drawing body of the plastic part extends beyond the third circle. The outer wall of the cylinder drawing is formed), that is, the second cylindrical drawing body and the first cylindrical drawing body of the plastic part are exposed outside the steel shell. In order to ensure that the plastic part and the steel shell can perform the punching operation and still have good fixing strength, the third cylindrical drawing body of the plastic part must have a certain height, that is, 1.5mm≤SJ2. If SJ2 is too small, the punching point Operation is difficult to implement. However, SJ2 should not be too large, otherwise it will occupy the height space of the battery, which is not conducive to the high capacity of the battery, so SJ2≤4.0mm.

The characteristic size SJ1+SJ2-SJ4 of the plastic part in this embodiment (that is, the sum of the heights of the second cylindrical drawing body and the third cylindrical drawing body of the plastic part) satisfies: PH+YJB (=0.60+2.45=3.05mm) ≤SJ1+SJ2-SJ4(=1.80+2.40-0.95=3.25mm) ≤PH+YJB+1.00mm(=0.60+2.45+1.00=4.05mm), where PH is the thickness of rigid FR-4 substrate, YJB is MicroUSB The thickness of the interface (YJB=2.45mm in this embodiment). The setting of the size of PH+YJB≤SJ1+SJ2-SJ4 is to consider that the MicroUSB interface 9 arranged on the B side of the rigid FR-4 substrate is completely accommodated in the second cylindrical stretching body 402 and the third cylindrical stretching body of the plastic part. In the internal cavity formed by 403, it plays the role of insulation and protection; the setting of SJ1+SJ2-SJ4≤ PH+YJB+1.00mm is to consider the second cylindrical drawing body and the third cylindrical drawing body of the plastic part. The sum of the heights cannot be too large, otherwise it will occupy the height space of the battery, which is not conducive to the high capacity of the battery.

The height SJ3 of the protruding portion of the lower edge of the plastic part in this embodiment satisfies: 0.50mm≤SJ3(=1.30mm)≤DP(=2.50mm), wherein DP is the height drop of the slope portion on one side of the flexible package lithium ion battery (ie the slope height difference between the highest point and the lowest point). The protruding part on the lower edge of the plastic part plays the role of installation, guiding and positioning and enhancing the strength of the protruding part on the outer edge of the plastic part. If the height of the protruding part on the lower edge is too small, it is not conducive to its function, so 0.50mm≤SJ3; however, , the protruding part of the lower edge of the plastic part is located above the slope part of the flexible packaging lithium-ion battery, and the height of the protruding part of the lower edge of the plastic part should not be too high, otherwise it will cause serious extrusion to the slope part of the flexible packaging lithium-ion battery. Therefore SJ3≤DP.

The characteristic dimensions of the outer edge protrusions and the guide grooves of the plastic parts in this embodiment satisfy: SA+0.30mm(=7.80+0.30=8.10mm)≤SB(=9.00mm)≤SA+2.00mm(=7.80+2.00= 9.80mm), SD4/2(=12.10/2=6.05mm)≤SK (=6.45mm)≤SD3/2-0.30mm(=13.50/2-0.30=6.45mm), where SB is the outer edge of the plastic part The width of the protruding part, SA is the distance between the two mutually parallel planes of the two guide grooves, SK is the distance from the intersection between the two mutually perpendicular planes of the guide groove to the center axis of the plastic part, SD3 is The outer diameter of the third cylindrical drawing body of the plastic part, SD4 is the inner diameter of the third cylindrical drawing body of the plastic part. The setting of SA+0.30mm≤SB dimension is to enhance the strength of the outer edge protrusion of the plastic part, especially to overcome the strength drop caused by the position of the guide groove of the plastic part; the setting of SB≤SA+2.00mm dimension is Considering that if the width dimension of the outer edge protrusion is too large, the size of the U-shaped opening of the steel shell will increase, which will cause the opening of the steel shell to be easily deformed during the assembly process. The setting of SK≤SD3/2-0.30mm is to meet the requirements of the thinnest wall thickness of the plastic parts (the wall thickness is SD3/2-SK) corresponding to the guide groove position of the plastic parts, that is, the thinnest wall thickness is greater than 0.30mm, otherwise the guide The strength of the plastic parts at the groove position is seriously insufficient and the injection molding process is difficult. The setting of SD4/2≤SK size is to consider that if the SK size is too small, the MicroUSB interface will occupy more rigid FR-4 substrate area, which is not conducive to the placement and placement of other components.

The key feature size of the rigid FR-4 substrate 5 in this embodiment satisfies: SD4-1.00mm(=12.10-1.00=11.10mm)≤PD(=11.90mm)≤SD4-0.10mm(=12.10-0.10=12.00mm), 0.4 mm≤PH(=0.60mm)≤1mm, where PD is the diameter of the rigid FR-4 substrate, PH is the thickness of the rigid FR-4 substrate, SD4 is the third cylindrical stretching body and the second cylindrical stretching body of the plastic part The inner diameter of the body. In order to realize that the rigid FR-4 substrate can be better assembled into the inner cavity formed by the second cylindrical drawing body and the third cylindrical drawing body of the plastic part, the diameter PD of the rigid FR-4 substrate should not be too large, that is, PD ≤ SD4-0.10mm, otherwise the assembly is difficult; at the same time, in order to facilitate the arrangement and placement of components on the rigid FR-4 substrate, it is necessary to increase the effective patch area of the rigid FR-4 substrate as much as possible. Therefore, the rigid FR-4 substrate The diameter of PD cannot be too small, that is, SD4-1.00mm≤PD. The thickness of the rigid FR-4 substrate satisfies 0.4mm≤PH≤1mm. If the thickness is too thin, the rigidity of the rigid FR-4 substrate will be insufficient, resulting in serious deformation of the rigid FR-4 substrate when the MicroUSB interface is subjected to the insertion and extraction force of the plug wire. fracture; if the thickness is too thick, the rigid FR-4 substrate occupies more height space, which is not conducive to the increase of battery capacity.

The height GKH of the steel case in this embodiment satisfies: GKH(=46.95)≤H-H1-SJ1(=50.50-1.50-1.80=47.20mm), where H is the total height of the lithium ion secondary battery, and H1 is the second metal cap. The height of a cylinder, SJ1 is the sum of the heights of the first cylindrical drawing body and the second cylindrical drawing body of the plastic part.

The height DXH of the flexible packaging lithium-ion battery in this embodiment satisfies: DXH(=43.00mm)≤GKH-SJ2-GKDH(=46.95-2.40-0.30=44.25mm), where GKH is the height of the steel case, and SJ2 is the first plastic part. The height of the three-cylinder drawing body, GKDH is the thickness of the bottom of the steel shell.

In conjunction with Fig. 1 to Fig. 9 (c), when this embodiment is actually produced, carry out according to the following steps:

(1) First, weld the A end of the positive lead wire of the cell to the first port pad J1 (ie, the J1 port) on the B side of the rigid FR-4 substrate, and connect the A end of the negative lead wire of the battery cell to the first port on the B side of the rigid FR-4 substrate. The two-port pad J2 (ie, the J2 port) is soldered. As shown in Figure 9(a).

(2) Solder the rigid FR-4 substrate 5 of all components (wherein the A surface of the rigid FR-4 substrate is soldered with the second capacitor, the first capacitor, the integrated IC, the protection IC, the third resistor, the second resistor , LED lamp, the J3 port on the A side of the rigid FR-4 substrate is soldered with a metal cap (that is, the bottom of the second cylinder of the metal cap is welded to the J3 port on the A side of the rigid FR-4 substrate), and the rigid FR-4 substrate B The third capacitor, the first resistor and the inductor are soldered on the surface, and the J4 port on the B side of the rigid FR-4 substrate is soldered with the MicroUSB interface) with the A side up and the B side down to the plastic part. The second cylinder pulls In the inner cavity formed by the extension body and the third cylindrical extension body, the MicroUSB interface is matched with the MicroUSB opening part provided on the side of the plastic part (that is, the opening end of the MicroUSB interface is matched with the MicroUSB opening part of the plastic part), and is installed in place. The rear rigid FR-4 substrate A side is clamped on the first support platform of the plastic part (the first support platform is formed by the bottom of the first cylinder stretching body extending beyond the inner wall of the second cylinder stretching body); the second cylinder of the metal cap The body is accommodated in the inner cavity of the first cylindrical drawing body of the plastic part, and the first cylindrical body of the metal cap protrudes from the upper end plane of the first cylindrical drawing body of the plastic part. As shown in Figure 9(b).

(3) Weld the B end of the positive lead wire of the battery cell to the positive end of the flexible package lithium ion battery, and weld the B end of the battery negative lead wire to the negative end of the flexible package lithium ion battery core.

(4) Fit the lower edge protrusion 407 of the plastic part with the edge end face of the slope of the flexible packaged lithium-ion cell, as shown in Figure 9(c); then put the flexible packaged lithium-ion battery into the steel shell from the open end of the steel shell Inside, the upper slope of the soft-packed lithium-ion battery is facing the U-shaped opening of the steel shell; then, the front end of the lower protruding part of the plastic part is extended into the steel shell, and then the outer edge of the outer wall of the plastic part is convex. The outgoing parts are aligned and matched and mounted on the U-shaped opening of the steel shell for positioning, and the lower protruding part of the plastic part and the third cylindrical drawing body of the plastic part are inserted into the steel shell in turn, and after the installation is in place The open end of the steel shell is clamped on the second support platform of the plastic part (the second support platform is formed by the bottom of the second cylindrical drawing body of the plastic part extending beyond the outer wall of the third cylindrical drawing body), that is, the first cylindrical drawing body of the plastic part The extension body and the second cylindrical extension body are exposed outside the steel shell, and the MicroUSB opening of the plastic part faces the U-shaped opening of the steel shell.

(5) Use steel to punch the junction of the third cylindrical drawing body of the plastic part and the steel shell, and the steel shell is deformed and embedded in the wall of the plastic part to realize the fixation of the plastic part and the steel shell.

Complete the production of cylindrical lithium-ion secondary batteries with its own MicroUSB charging interface and integrated charging management, constant voltage output, charging and discharging protection and other functions, with high integration efficiency, high capacity, and high reliability.

After the lithium ion secondary battery of this embodiment is completely discharged, the lithium ion secondary battery is charged under CV conditions: the constant voltage is 5V, and the charging input interface is a MicroUSB interface. Figure 10 shows the charging voltage-charging current-charging capacity relationship curve obtained when the battery is charged through the MicroUSB interface. The charging time is 127 minutes, the maximum charging current is 570mA, and the total charging capacity is 805.9mAh. During the charging process, The management of charging and the protection of charging are implemented by the circuit inside the battery itself.

The fully charged battery is discharged at a constant current of 500mA, and the cut-off voltage is 1.0V. The discharge voltage-discharge current-discharge capacity relationship curve under the condition of discharge is shown in Figure 11. The discharge voltage of the lithium-ion secondary battery is 1483mV. ～1481mV, stable in the range of 1.50±0.10V, achieving the function of constant voltage output with 500mA current, and the discharge capacity of the whole discharge process is 1826.2mAh. When the discharge is over, the discharge voltage suddenly drops to 0.071V and the current is 0mA, indicating that the over-discharge protection condition is triggered, the discharge circuit is turned off, and the discharge protection function is realized.

Under the prior art method, the same type of R06 size battery, because a lithium ion secondary battery often uses two or more rigid FR-4 substrates for soldering and splicing, resulting in more complicated processing technology and more difficult processing. , the processing cost is high; the assembly accuracy of the MicroUSB interface and the corresponding opening of the steel shell is not good, and the efficiency is not high; the strength of the MicroUSB opening of the plastic part is poor; the overall appearance of the lithium-ion secondary battery after assembly is poor. And the technical solution of this embodiment better solves the above problems.

It should be noted that although this embodiment takes a step-down constant-voltage 1.50V output lithium-ion battery as an example for description, it is also applicable to the working condition where the lithium-ion secondary battery needs a step-up constant-voltage output, such as a 9V constant-voltage output. Lithium-ion batteries, etc.

It should be noted that although this embodiment is described with the R06 model size, it is also applicable to batteries of other sizes.

Example 2

A lithium ion secondary battery, the structure of which is similar to that of the lithium ion secondary battery in Example 1, the difference is that the constant output voltage is 1.50V, the third resistance R3 is 2K±1%, The maximum charging current corresponding to the lithium-ion secondary battery is 312 mA.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (3)

1. A lithium-ion secondary battery, characterized in that: comprising a flexible package lithium-ion battery, a steel case, a MicroUSB interface, a protection IC, an integrated IC, the first resistance, the second resistance, the third resistance, the first capacitor, the first Two capacitors, third capacitors, inductors, LED lights, plastic parts, rigid FR-4 substrates and metal caps, to achieve MicroUSB interface rechargeable, constant voltage output, charging management and protection, overcharge, over-discharge and over-current protection multi-integrated functions ; The plastic part includes a first cylindrical drawing body, a second cylindrical drawing body and a third cylindrical drawing body, the top of the first cylindrical drawing body is provided with a metal cap opening, and the second cylindrical drawing body is provided with a metal cap opening. The lateral sides of the extension body and the third cylindrical extension body are jointly provided with a MicroUSB opening part placed laterally, and the inner walls of the second cylindrical extension body and the third cylindrical extension body are provided with two adjacent sides of the MicroUSB opening part. A guide groove with an L-shaped cross-section, a lower edge protrusion is provided on the lower part of the third cylindrical drawing body close to the MicroUSB opening, and the outer wall of the third cylindrical drawing body is located at the periphery of the MicroUSB opening. Along the protruding part; the protruding part of the lower edge of the plastic part plays the role of installation, guiding and positioning and enhancing the strength of the protruding part of the outer edge of the plastic part. The metal cap includes a first cylinder body and a second cylinder body, the upper end of the first cylinder body is closed and the lower end is open, the upper end face of the first cylinder body is a chamfered structure, and the lower end of the first cylinder body is provided with an outward facing Skirt, the cross-section of the first cylinder is an isosceles trapezoid with hollow inside and a small upper and a large lower; the top edge of the second cylinder is connected with the skirt edge of the first cylinder as a whole, and the first cylinder and the The second cylinder is coaxial, the lower end of the second cylinder is open, and the cross-section of the second cylinder is a hollowed-out rectangle; the first cylinder of the metal cap serves as the positive terminal of the battery, and the first cylinder of the metal cap serves as the positive terminal of the battery. Body and metal cap The inner cavity of the second cylinder is used as a storage body for the soldered components mounted on the A side of the rigid FR-4 substrate, which can make full use of the height space of the metal cap and reduce the total height of the structural parts; the flexible packaging lithium The ion cell is placed in the steel case, and the positive and negative terminals of the soft-packed lithium-ion cell are welded to the first port pad and the second port on the B side of the rigid FR-4 substrate through the cell’s positive lead and the battery’s negative lead, respectively. The plates are connected correspondingly, the metal cap is placed in the plastic part, and the first cylinder of the metal cap protrudes from the upper end plane of the first cylindrical drawing body of the plastic part. It is installed in the plastic part and the open end of the MicroUSB interface is matched in the MicroUSB opening of the plastic part. The third port pad on the A side of the rigid FR-4 substrate is welded to the bottom of the second cylinder of the metal cap. The plastic part is welded together. The first cylindrical drawing body and the second cylindrical drawing body are matched and installed in the open end of the steel shell in such a way that the first cylindrical drawing body and the second cylindrical drawing body are exposed. , The MicroUSB opening of the plastic part is facing the U-shaped opening of the steel shell; The key feature size of the metal cap satisfies: SD2-1.00mm≤M2≤SD2, H2=SJ4, π/2＜β≤

, SD4-4.00mm≤SD2≤SD4-0.50mm, Yjasec+MH≤SJ4≤Yjmax+MH, 1.5mm≤SJ2≤4.0mm, 2mm≤M1≤5.5mm, where M2 is the outer diameter of the second cylinder of the metal cap , SD2 is the inner diameter of the first cylindrical drawing body of the plastic part; SD4 is the inner diameter of the third cylindrical drawing body or the second cylindrical drawing body of the plastic part; H2 is the height of the second cylindrical body of the metal cap; SJ2 is the The height of the third cylindrical stretching body of the plastic part; SJ4 is the height of the first cylindrical stretching body of the plastic part; The maximum outer diameter of the first cylinder of the metal cap, MH is the wall thickness of the first cylinder of the metal cap, the wall thickness of the second cylinder or the thickness of the skirt of the first cylinder, Yjasec is the rigid FR-4 substrate A surface The second height of the chip soldered components, Yjmax is the maximum height of the soldered components on the A side of the rigid FR-4 substrate, a is the maximum height of the soldered components on the A side of the rigid FR-4 substrate The length of , b is the width of the component with the highest height that is soldered on the A side of the rigid FR-4 substrate. 2 . The lithium ion secondary battery according to claim 1 , wherein the first cylindrical drawing body, the second cylindrical drawing body and the third cylindrical drawing body of the plastic part are coaxial; 2 . The first cylindrical drawing body and the second cylindrical drawing body are connected in sequence from top to bottom in a way that the outer wall is flush, and the bottom of the first cylindrical drawing body exceeds the inner wall of the second cylindrical drawing body to form the first cylindrical drawing body. Support platform; the second cylindrical drawing body and the third cylindrical drawing body are connected in sequence from top to bottom in a way that the inner wall is flush, and the bottom of the second cylindrical drawing body exceeds the outer wall of the third cylindrical drawing body A second support platform is formed; the height SJ3 of the protruding part on the lower edge of the plastic part satisfies: 0.50mm≤SJ3≤DP, where DP is the height difference of the slope part on one side of the flexible packaging lithium ion battery. 3. The lithium ion secondary battery according to claim 1 or 2, wherein the characteristic dimensions of the outer edge protrusions and the guide grooves of the plastic parts satisfy: SA+0.30mm≤SB≤SA+2.00mm , SD4/2≤SK≤SD3/2-0.30 mm, where SB is the width of the outer edge of the plastic part, SA is the distance between the two parallel planes of the two guide grooves, and SK is the guide The distance from the intersection between the two mutually perpendicular planes of the groove to the center axis of the plastic part, SD3 is the outer diameter of the third cylindrical stretching body of the plastic part, SD4 is the inner diameter of the third cylindrical stretching body of the plastic part.

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