High-reliability lithium ion battery

Abstract

The utility model relates to a high-reliability lithium ion battery, which comprises a shell, a lithium ion battery pack and a lithium ion battery pack, the battery cell is arranged in the shell, a negative electrode is electrically connected with the shell, a positive electrode faces the mounting opening, and a positive electrode end of the battery cell is provided with a positive electrode convex body and a ring groove; the step-down integrated module comprises a PCB, and a positive electrode contact pin, a positive electrode cap, a negative electrode ring and a charging interface module which are electrically connected with the PCB, the charging interface module is exposed from the charging port, the shell forms an inward baffle ring through flanging and riveting, and the top surface of the negative electrode ring abuts against the baffle ring and is electrically connected with the baffle ring; the positive conductive part comprises a gasket and a positive contact cylinder arranged on the gasket, the positive contact pin is provided with an expansion head, the positive contact cylinder is made of an elastic conductive material and provided with a limiting clamping groove matched with the expansion head, and the positive conductive part is electrically connected with the positive convex body in a welded mode; and the supporting piece comprises a cylindrical wall, the outer diameter of the cylindrical wall is set to be matched with the annular groove, the cylindrical wall is provided with a plurality of supporting walls, and the supporting walls support the pressure reduction integrated module.

Description

Technical Field

[0001] The utility model relates to the technical field of rechargeable lithium-ion batteries, in particular to a high-reliability lithium-ion battery. Background Art

[0002] The positive and negative output terminals of the lithium-ion mother cell need to be connected to the corresponding positive and negative input terminals of the step-down module.

[0003] Existing technologies generally use two connection methods:

[0004] 1. Use metal conductors or wires to connect the positive and negative output terminals of the 3.7V mother battery cell and the corresponding positive and negative input terminals of the step-down module by welding. This connection method can ensure conductivity, but the process is complicated and the work efficiency is low. It is easy to cause poor welding or cold welding, and it is difficult to achieve automated production.

[0005] 2. Use a metal spring or metal pin to physically contact the positive and negative output terminals of the 3.7V mother battery cell with the corresponding positive and negative input terminals of the step-down module through the deformation pressure of the spring or spring. Although this connection method is simple, the contact surface is a two-dimensional plane with a limited contact area. At the same time, the metal spring or metal spring is always in a compressed state. Over time, the elastic structure is prone to fatigue, resulting in unsatisfactory contact performance in the later stage, which can easily cause quality and performance problems of the battery. Utility Model Content

[0006] In view of the above situation, it is necessary to propose a high-reliability lithium-ion battery.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-reliability lithium-ion battery, comprising:

[0008] The housing is cylindrical and made of a conductive material. One end of the housing has an axially open mounting opening, and an end adjacent to the mounting opening has a radially open charging port.

[0009] A battery cell is disposed in the housing, with the negative electrode electrically connected to the housing and the positive electrode facing the mounting opening, and the positive terminal of the battery cell has a positive electrode protrusion and a ring groove;

[0010] A step-down integrated module includes a PCB, a positive contact pin, a positive cap, a negative electrode ring, and a charging interface module electrically connected to the PCB. The charging interface module is exposed from the charging port. The housing is riveted to form an inward retaining ring. The top surface of the negative electrode ring is in electrical contact with the retaining ring.

[0011] The positive electrode conductive member includes a gasket and a positive electrode contact cylinder disposed on the gasket. The positive electrode contact pin has an expansion head. The positive electrode contact cylinder is made of an elastic conductive material and is provided with a limit card slot adapted to the expansion head. The positive electrode conductive member is welded and electrically connected to the positive electrode convex body;

[0012] The support member includes a cylindrical wall, and the outer diameter of the cylindrical wall is also adapted to the annular groove. A plurality of support walls are provided on the cylindrical wall, and the support walls support the step-down integrated module.

[0013] Further, a socket is provided on the PCB board, and a plug block adapted to the socket is provided on the support wall.

[0014] Further, the sockets are symmetrically or arranged in an annular array, and the plug blocks correspond to the sockets.

[0015] Further, the support member further includes a support platform disposed inside the cylindrical wall, and the support platform supports the charging interface module.

[0016] Further, a current collector is further included. The current collector is disposed between the negative electrode of the battery cell and the bottom of the housing, and a plurality of elastic protrusions are provided on the current collector.

[0017] Further, a plurality of elastic protrusions are provided on both the front and back surfaces of the current collector.

[0018] Further, the current collector is provided with a plurality of radially open radial grooves.

[0019] Further, a face ring is further included. The face ring is bonded to the step-down integrated module. The positive electrode cap extends out of the housing from the face ring, and the face ring isolates the positive electrode cap and the negative electrode ring.

[0020] Further, a positioning hole is provided on the positive electrode convex body. The positive electrode contact cylinder is adapted to the positioning hole and opens towards the positive electrode contact pin.

[0021] Further, the positive electrode contact pin is disposed eccentrically.

[0022] The beneficial effects of the present utility model are as follows: The positive electrode of the step-down integrated module is clamped with the limit card slot of the positive electrode contact cylinder on the positive electrode conductive member through the expansion head of the positive electrode contact pin, with stable contact, no continuous deformation pressure, no fatigue generated, and strong reliability. The negative electrode of the step-down integrated module is a negative electrode ring, which is in electrical connection with the retaining ring formed by riveting the folded edge of the housing, with a large contact area and strong reliability. A support member is provided between the step-down integrated module and the battery cell to support and protect the step-down integrated module, and can ensure stable contact between the positive and negative electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic exploded view of a highly reliable lithium-ion battery according to an embodiment of the present utility model;

[0024] Figure 2 It is a schematic cross-sectional view of the positive electrode of the battery cell of a highly reliable lithium-ion battery according to an embodiment of the present utility model;

[0025] Figure 3 It is a partial cross-sectional view of the negative electrode of the battery cell of a highly reliable lithium-ion battery according to an embodiment of the present utility model;

[0026] Figure 4 It is a schematic diagram of the structure of a step-down integrated module of a highly reliable lithium-ion battery according to an embodiment of the present utility model;

[0027] Figure 5 It is a schematic diagram of the structure of a support member of a highly reliable lithium-ion battery according to an embodiment of the present utility model;

[0028] Figure 6 It is a schematic diagram of the structure of a highly reliable lithium-ion battery according to another embodiment of the present utility model;

[0029] Figure 7 It is a schematic cross-sectional view of a highly reliable lithium-ion battery according to another embodiment of the present utility model.

[0030] Reference numerals:

[0031] 100, housing; 110, mounting opening; 120, charging port; 130, retaining ring; 200, battery cell;

[0032] 210, positive electrode protrusion; 211, positioning hole; 220, annular groove; 300, step-down integrated module;

[0033] 310, PCB board; 311, socket; 320, positive electrode contact pin; 321, expansion head; 330, positive electrode cap;

[0034] 340, negative electrode ring; 350, charging interface module; 400, positive electrode conductive member; 410, gasket;

[0035] 420, positive electrode contact cylinder; 421, limit card slot; 500, support member; 510, cylindrical wall;

[0036] 520, support wall; 521, insertion block; 530, support platform; 600, current collector; 610, elastic protrusion; 620, radial groove; 700, face ring. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following further details a high-reliability lithium-ion battery of the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0038] Please refer to Figures 1-7 , a high-reliability lithium-ion battery, comprising:

[0039] A housing 100, which is cylindrical and made of a conductive material. One end of the housing 100 has an axially open mounting port 110, and a radially open charging port 120 is provided at one end close to the mounting port 110;

[0040] A battery cell 200, which is disposed inside the housing 100, and the negative electrode is electrically connected to the housing 100, and the positive electrode faces the mounting port 110. The positive electrode end of the battery cell 200 has a positive electrode convex body 210 and a ring groove 220;

[0041] A step-down integrated module 300, comprising a PCB board 310, and a positive electrode contact pin 320, a positive electrode cap 330, a negative electrode ring 340 and a charging interface module 350 electrically connected to the PCB board 310. The charging interface module 350 is exposed from the charging port 120. The housing 100 forms an inwardly facing retaining ring 130 through hemming and riveting, and the top surface of the negative electrode ring 340 abuts and is electrically connected to the retaining ring 130;

[0042] A positive electrode conductive member 400, comprising a gasket 410 and a positive electrode contact cylinder 420 provided on the gasket 410. The positive electrode contact pin 320 has an expansion head 321. The positive electrode contact cylinder 420 is made of an elastic conductive material and is provided with a limit card slot 421 adapted to the expansion head 321. The positive electrode conductive member 400 is welded and electrically connected to the positive electrode convex body 210;

[0043] A support member 500, comprising a cylindrical wall 510. The outer diameter of the cylindrical wall 510 is also adapted to the ring groove 220, and a plurality of support walls 520 are provided on the cylindrical wall 510. The support walls 520 support the step-down integrated module 300.

[0044] The positive electrode of the step-down integrated module 300 is snap-connected to the limit card slot 421 of the positive electrode contact cylinder 420 on the positive electrode conductive member 400 through the expansion head 321 of the positive electrode contact pin 320, with stable contact, no continuous deformation pressure, no fatigue generated, and strong reliability. The negative electrode of the step-down integrated module 300 is the negative electrode ring 340, which is in contact and electrically connected to the retaining ring 130 formed by hemming and riveting the housing 100, with a large contact area and strong reliability. A support member 500 is provided between the step-down integrated module 300 and the battery cell 200 to support and protect the step-down integrated module 300, and ensure stable contact between the positive and negative electrodes.

[0045] Please refer toFigure 4 And Figure 5 On the PCB board 310, there is a socket 311, and on the support wall 520, there is a plug block 521 adapted to the socket 311. The socket 311 is provided for horizontal rotation limit to prevent the charging interface module 350 from horizontally offsetting from the charging port 120.

[0046] Preferably, the sockets 311 are symmetrically or arranged in an annular array, and the plug blocks 521 correspond to the sockets 311. This further limits the horizontal rotation to ensure reliability.

[0047] Please refer to Figure 2 、 Figure 5 And Figure 7 The support member 500 further includes a support platform 530 disposed inside the cylindrical wall 510, and the support platform 530 supports the charging interface module 350. The support platform 530 is provided to support the charging interface module 350, ensuring the reliability of the charging interface module 350 and preventing misalignment caused by long-term plugging and unplugging. It can be understood that the support platform 530 is generally in a circular segment shape to facilitate the docking of the positive electrode pin 320 / positive electrode contact.

[0048] Please refer to Figure 1 、 Figure 3 And Figure 7 It further includes a current collector 600, and the current collector 600 is disposed between the negative electrode of the battery cell 200 and the bottom of the housing 100. A number of elastic protrusions 610 are provided on the current collector 600. The current collector 600 is provided to ensure the stability and reliability of the contact of the negative electrode of the battery cell 200.

[0049] Preferably, a number of elastic protrusions 610 are provided on both the front and back surfaces of the current collector 600. The elastic protrusions 610 are provided on both surfaces to provide elastic deformation, which not only ensures stable contact but also facilitates welding.

[0050] Please refer to Figure 1 The current collector 600 is provided with a number of radial grooves 620 with radial openings. The radial grooves 620 are provided to facilitate the welding of the current collector 600.

[0051] Please refer to Figure 1 、 Figure 2 And Figure 7 It further includes a face ring 700, and the face ring 700 is bonded to the step-down integrated module 300. The positive electrode cap 330 extends out of the housing 100 from the face ring 700, and the face ring 700 isolates the positive electrode cap 330 and the negative electrode ring 340. It can be understood that the face ring 700 is made of an insulating material, such as plastic.

[0052] Please refer to Figure 6 And Figure 7, a positioning hole 211 is provided on the positive electrode convex body 210, and the positive electrode contact cylinder 420 is adapted to the positioning hole 211 and opens towards the positive electrode contact pin 320. By setting the positioning hole 211, the positive electrode conductive member 400 can be better fixed.

[0053] Preferably, the positive electrode contact pin 320 is arranged offset from the axis. The eccentrically arranged positive electrode contact pin 320 can play a role in horizontal limit and ensure the docking of the charging interface module 350 and the charging port 120.

[0054] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0055] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0056] In summary, for the high-reliability lithium-ion battery provided by the present invention, the positive electrode of the step-down integrated module is clamped with the limit card slot of the positive electrode contact cylinder on the positive electrode conductive member through the expansion head of the positive electrode contact pin, with stable contact, no continuous deformation pressure, no fatigue generation, and strong reliability. The negative electrode of the step-down integrated module is a negative electrode ring, which is in electrical connection with the retaining ring formed by riveting the folded edge of the housing, with a large contact area and strong reliability. A support member is provided between the step-down integrated module and the battery cell to support and protect the step-down integrated module.

[0057] The above are only preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to be equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A highly reliable lithium-ion battery, characterized in that, Comprising: A housing, which is cylindrical. The housing is made of a conductive material. One end of the housing has an axially open mounting port, and a radially open charging port is provided at one end close to the mounting port. A battery cell, which is disposed in the housing. The negative electrode is electrically connected to the housing, and the positive electrode faces the mounting port. The positive electrode end of the battery cell has a positive electrode convex body and an annular groove. A step-down integrated module, including a PCB board, a positive electrode contact pin, a positive electrode cap, a negative electrode ring, and a charging interface module that are electrically connected to the PCB board. The charging interface module protrudes from the charging port. The housing forms an inwardly facing retaining ring through hemming and riveting. The top surface of the negative electrode ring abuts against and is electrically connected to the retaining ring. A positive electrode conductive member, including a gasket and a positive electrode contact cylinder provided on the gasket. The positive electrode contact pin has an expansion head. The positive electrode contact cylinder is made of an elastic conductive material and is provided with a limit card slot adapted to the expansion head. The positive electrode conductive member is welded and electrically connected to the positive electrode convex body. A support member, including a cylindrical wall. The outer diameter of the cylindrical wall is adapted to the annular groove. A plurality of support walls are provided on the cylindrical wall, and the support walls support the step-down integrated module.

2. The high-reliability lithium-ion battery according to claim 1, wherein The PCB board is provided with a socket, and the support wall is provided with a plug adapted to the socket.

3. The high-reliability lithium-ion battery according to claim 2, characterized in that, The sockets are symmetrically or arranged in an annular array, and the plugs correspond to the sockets.

4. A highly reliable lithium-ion battery according to claim 1, characterized in that, The support member further includes a support platform disposed inside the cylindrical wall, and the support platform supports the charging interface module.

5. A highly reliable lithium-ion battery according to claim 1, characterized in that, It further includes a current collector plate, which is disposed between the negative electrode of the battery cell and the bottom of the housing. A plurality of elastic protrusions are provided on the current collector plate.

6. A highly reliable lithium-ion battery according to claim 5, characterized in that, A plurality of elastic protrusions are provided on both the front and back surfaces of the current collector plate.

7. A highly reliable lithium-ion battery according to claim 5 or 6, characterized in that, The current collector plate is provided with a plurality of radially open radial grooves.

8. A highly reliable lithium-ion battery according to claim 1, characterized in that, It further includes a face ring, which is bonded to the step-down integrated module. The positive electrode cap protrudes from the face ring out of the housing, and the face ring isolates the positive electrode cap and the negative electrode ring.

9. A highly reliable lithium-ion battery according to claim 1, wherein, The positive electrode convex body is provided with a positioning hole, and the positive electrode contact cylinder is adapted to the positioning hole and opens towards the positive electrode contact pin.

10. A highly reliable lithium-ion battery according to claim 1, characterized in that, The positive electrode contact pin is disposed eccentrically.

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