Rechargeable battery

Abstract

The present invention discloses a recyclable rechargeable battery. By arranging a needle-shaped pole ear extending outward from the battery body on the battery cell, and arranging a needle sleeve matching the needle-shaped pole ear on the circuit protection board, the battery cell and the circuit protection board can be quickly electrically connected through the plug-in cooperation of the needle-shaped pole ear and the needle sleeve. At the same time, the plane part of the needle sleeve corresponding to the negative pole ear is extended to the outside of the circuit protection board, and the end of the plane part is folded upward relative to the front of the circuit protection board to form a bending part, and a plurality of contact convex points are convexly provided on the outer side of the bending part. When the circuit protection board is plugged into the steel shell, it can be electrically connected through frictional contact with the inner wall of the steel shell through the contact convex points. In this way, there is no need to arrange an additional conductive sheet on the circuit protection board to form an electrical contact with the steel shell, which avoids the problem that the conductive sheet is easily colliding with the opening of the steel shell and bending and breaking during the assembly process, making the assembly of the battery simpler and more convenient, and the yield rate is high.

Description

Technical Field

[0001] The present invention relates to the technical field of rechargeable batteries, and in particular to a cyclic rechargeable battery. Background Art

[0002] There are two main types of rechargeable cylindrical lithium batteries, one is an integrated rechargeable battery with a built-in USB charging port, and the other is a rechargeable battery with a separate battery and charger.

[0003] The existing rechargeable battery with built-in USB charging interface is generally composed of a shell, a battery cell, a circuit protection board (PCBA), a plastic shell, a face shell, and a positive terminal. The battery cell, the circuit protection board (PCBA), the plastic shell, and the face shell are sequentially sleeved on the shell, and the circuit protection board is plugged into the plastic shell. The front end of the battery cell has two positive and negative pole ears leading outward, and the circuit protection board is provided with pads corresponding to the positive and negative pole ears. During assembly, the positive and negative pole ears of the battery cell are soldered to the pads of the circuit protection board by soldering. At the same time, a conductive sheet is also provided on the circuit protection board, and the conductive sheet is connected to the pad corresponding to the negative pole ear through an internal circuit. The conductive sheet is usually L-shaped, and the horizontal part of the conductive sheet is connected and welded to the circuit protection board, and its vertical part extends downward from the axial direction of the battery. After the battery cell and the circuit protection board are welded together, the battery cell and the circuit protection board are plugged into the steel shell, and the conductive sheet contacts the steel shell to guide the negative pole of the battery cell to the bottom of the steel shell (i.e., the bottom of the battery).

[0004] Since there is no automatic welding equipment specifically for such small batteries and circuit protection boards, rechargeable batteries with USB charging interfaces are usually still welded and assembled manually. The circuit protection board and the battery are small in size, and the pads on the circuit protection board and the positive and negative poles of the battery cannot be set very large, making welding difficult and greatly affecting the battery yield and assembly efficiency.

[0005] Furthermore, the conductive sheet is thin and small, and when it is assembled into the steel housing along with the circuit protection board, it is easy to collide with the opening of the steel housing and bend and break, further affecting the assembly of the battery.

[0006] In summary, current rechargeable lithium batteries still need further improvement. Summary of the invention

[0007] In view of the problems existing in the prior art, the main purpose of the present invention is to provide a recyclable rechargeable battery that is easy to assemble manually.

[0008] To achieve the above-mentioned purpose, the recyclable rechargeable battery proposed in the present invention includes a steel shell, a battery cell, a circuit protection board, a plastic cap, and a positive electrode cover plate. The battery cell is inserted into the steel shell, the plastic cap is inserted into the opening of the steel shell, the circuit protection board is clamped between the battery cell and the plastic cap, and the positive electrode cover plate is sealed on the top of the plastic cap.

[0009] The battery cell has a needle-shaped pole ear extending outward from the battery cell body. The circuit protection board is arranged along the axial direction of the battery cell, and a needle sleeve matching the needle-shaped pole ear is welded on the front side thereof. The battery cell and the circuit protection board are electrically connected through the insertion of the needle-shaped pole ear and the needle sleeve.

[0010] The needle sleeve has a curling portion and a plane portion tangent to the curling portion, the plane portion is welded to the circuit protection board, and the needle-shaped pole ear is inserted into a middle hole formed by winding the curling portion.

[0011] The flat portion of one of the needle sleeves extends to the outside of the circuit protection board, and the end of the flat portion is folded upward relative to the front side of the circuit protection board to form a bent portion, and a plurality of contact protrusions are convexly provided on the outer side surface of the bent portion. When the circuit protection board is inserted into the steel shell, the contact protrusions are in frictional contact with the inner wall of the steel shell to form an electrical connection.

[0012] Optionally, the bending portion is arranged to be inclined toward one side of the curling portion.

[0013] Optionally, the positive electrode cover plate has a spring sheet extending downward, the plastic cap has a evacuation hole for the spring sheet to pass through, the circuit protection board has an extension portion extending toward the evacuation hole, and a contact sheet is provided on the back of the extension portion. After the spring sheet passes through the evacuation hole, it is crimped onto the contact sheet to form an electrical connection with the circuit protection board.

[0014] Optionally, the spring sheet has a first elastic arm bent along the central axis of the positive electrode cover plate, an end of the first elastic arm is folded outward relative to the central axis of the positive electrode cover plate to form a second elastic arm, and an arc arm is provided between the first elastic arm and the second elastic arm.

[0015] After the spring piece passes through the avoidance hole, the arc-shaped arm is pressed onto the contact piece.

[0016] Optionally, the inner wall of the plastic cap has a protrusion extending toward its center, and the protrusion is located below the avoidance hole. After the spring sheet is inserted into the avoidance hole, the second elastic arm of the spring sheet passes through the protrusion and contacts the lower side of the end of the protrusion.

[0017] Optionally, the upper side surface of the protrusion has an inclined surface, and the inclined surface is inclined downward from one side of the inner wall of the plastic cap.

[0018] Optionally, the bottom of the plastic cap has two oppositely arranged bayonet holes, the two sides of the upper end portion of the circuit protection board are engaged in the two bayonet holes, and the extension portion passes through the avoidance hole of the plastic cap.

[0019] Optionally, the circumferential side of the plastic cap has an extension portion extending downward along its axial direction, and when the upper end of the circuit protection board is engaged on the plastic board, the lower end of the extension portion is flush with the lower end surface of the circuit protection board.

[0020] Optionally, the extension portion is arranged to be inclined toward the central axis of the plastic cap.

[0021] Optionally, the peripheral side wall of the plastic cap has two oppositely arranged protruding ears, and the peripheral wall of the opening of the steel shell has concave ears corresponding to the protruding ears.

[0022] The recyclable rechargeable battery provided by the present invention is provided with a needle-shaped pole ear extending outward from the battery cell body, and a needle sleeve matching the needle-shaped pole ear is provided on the circuit protection board, so that the battery cell and the circuit protection board can be quickly electrically connected through the plug-in cooperation of the needle-shaped pole ear and the needle sleeve, eliminating the welding process of the pole ear and the circuit protection board, providing convenience for manual assembly of the battery, and improving the assembly efficiency of the battery.

[0023] Furthermore, by extending the flat portion of the needle sleeve toward the outside of the circuit protection board, and folding the end of the flat portion upward relative to the front of the circuit protection board to form a bent portion, and providing a plurality of contact bumps on the outer side of the bent portion, when the circuit protection board is plugged into the steel shell, the contact bumps can form an electrical connection with the inner wall of the steel shell through frictional contact. In this way, there is no need to provide an additional conductive sheet on the circuit protection board to form an electrical contact with the steel shell, avoiding the problem of the conductive sheet easily collided with the opening of the steel shell and being bent and damaged during the assembly process, making the assembly of the battery simpler and more convenient, and with a high yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded schematic diagram of an embodiment of a recyclable rechargeable battery of the present invention;

[0025] Figure 2 An upper axial cross-sectional view of an embodiment of a recyclable rechargeable battery of the present invention;

[0026] Figure 3 A radial cross-sectional view of an embodiment of a recyclable rechargeable battery of the present invention;

[0027] Figure 4 It is a schematic diagram of assembling the positive electrode cover plate and the plastic cap in one embodiment of the recyclable rechargeable battery of the present invention;

[0028] Figure 5It is a schematic diagram of the assembled positive electrode cover plate and the plastic cap in one embodiment of the recyclable rechargeable battery of the present invention;

[0029] Figure 6 The figure is a schematic diagram of the cooperation between the circuit protection board and the assembled positive electrode cover plate and plastic cap in one embodiment of the recyclable rechargeable battery of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Please refer to the instruction manual Figure 1-3 In an embodiment of the present invention, a recyclable rechargeable battery is proposed, which includes a steel shell 1, a battery cell 2, a circuit protection board 3, a plastic cap 4, and a positive electrode cover 5. The battery cell 2 is inserted into the steel shell 1, the plastic cap 4 is inserted into the opening of the steel shell 1, the circuit protection board 3 is clamped between the battery cell 2 and the plastic cap 4, and the positive electrode cover 5 is sealed on the top of the plastic cap 4.

[0032] The circuit protection board 3 is arranged along the axial direction of the battery cell 2, with its lower end abutting against the upper end surface of the battery cell 2, and its upper end abutting against the plastic cap 4. The battery cell 2 has needle-shaped pole ears (21, 22) extending outward from the battery cell 2 body, wherein the needle-shaped pole ear 21 is a positive pole ear, and the needle-shaped pole ear 22 is a negative pole ear. The front lower end of the circuit protection board 3 is welded with a needle sleeve (31, 32) matched with the needle-shaped pole ears (21, 22), and the battery cell 2 and the circuit protection board 3 are electrically connected by the insertion of the needle-shaped pole ears (21, 22) and the needle sleeve (31, 32).

[0033] The front of the circuit protection board 33 is also provided with a Type-C charging interface 33 for charging, and the back thereof is provided with a charging management chip (not shown) and other electronic components for charging management. The charging management chip can achieve constant voltage output, charging management and protection, overcurrent, overcharge and overdischarge protection, so as to improve the intelligent charging and discharging of the rechargeable battery and improve the safety of the use of the rechargeable battery. The charging management chip and the electronic components are attached to the circuit protection board 3 in the form of SMT patches, which can effectively reduce the size of the circuit protection board 3, so that the circuit protection board 3 can be used in a small space.

[0034] like Figure 3As shown, the needle sleeves (31, 32) have curled portions (31a, 32a) and planar portions (31b, 32b) tangent to the curled portions (31a, 32a), a pad position (not shown) corresponding to the needle sleeves (31, 32) is provided on the circuit protection board 3, the planar portions (31b, 32b) of the needle sleeves (31, 32) are fixed to the pad position of the circuit protection board 3 by soldering, and the needle-shaped pole ears (21, 22) are inserted into the middle hole formed by winding the curled portions (31a, 32a).

[0035] The flat surface 32b of the needle sleeve 32 extends to the right outer side of the circuit protection board 3, and the extended portion is folded upward relative to the front surface of the circuit protection board 3 to form a bent portion 32c. Two hemispherical contact bumps (32d, 32e) are convexly arranged on the outer side surface of the bent portion 32c. When the circuit protection board 3 is plugged into the steel housing 1, the contact bumps and the inner wall of the steel housing 1 are frictionally contacted to form an electrical connection, thereby guiding the negative electrode of the battery cell 2 to the steel housing 1.

[0036] Compared with the prior art, the recyclable rechargeable battery provided by the present invention is provided with needle-shaped pole ears (21, 22) extending outward from the body of the battery cell 2, and needle sleeves (31, 32) matching with the needle-shaped pole ears (21, 22) are provided on the circuit protection board 3, so that the battery cell 2 and the circuit protection board 3 can be quickly electrically connected through the plug-in cooperation of the needle-shaped pole ears (21, 22) and the needle sleeves (31, 32), eliminating the welding process of the pole ears and the circuit protection board 3, providing convenience for manual assembly of the battery, and improving the assembly efficiency of the battery.

[0037] Furthermore, by extending the plane portion 32b of the needle sleeve 32 toward the outside of the circuit protection board 3, and folding the end of the plane portion 32b upward relative to the front of the circuit protection board 3 to form a bent portion 32c, and providing contact bumps (32d, 32e) on the outer side of the bent portion 32c, when the circuit protection board 3 is plugged into the steel housing 1, the contact bumps (32d, 32e) can form an electrical connection with the inner wall of the steel housing 1 through frictional contact. In this way, there is no need to provide an additional conductive sheet on the circuit protection board 3 to form an electrical contact with the steel housing 1, avoiding the problem of the conductive sheet easily collided with the opening of the steel housing 1 and being bent and damaged during assembly, making the assembly of the battery simpler and more convenient, and with a high yield rate.

[0038] like Figure 1 As shown in Figure 3, in this embodiment, the outside of the steel housing 1 is wrapped with a PVC heat shrink film 6 to protect the battery.

[0039] Alternatively, if Figure 3As shown, in this embodiment, the bent portion 32c is slightly inclined toward the curled portion 32a. Since the steel housing 1 is generally cylindrical, if the bent portion 32c is bent outward relative to the curled portion 32a or is perpendicular to the flat portion 32b, the bent portion 32c is likely to interfere with the inner wall of the steel housing 1 during assembly, affecting assembly. By inclining the bent portion 32c toward the curled portion 32a, the bent portion 32c can be prevented from interfering with the interior of the steel housing 1, and at the same time, the contact bumps (32d, 32e) can better contact and conduct electricity with the inner wall of the steel housing 1.

[0040] Alternatively, if Figure 1 , 4 -6, in this embodiment, the positive electrode cover plate 5 has a spring sheet 51 extending downward, the plastic cap 4 has a avoidance hole 4a for the spring sheet 51 to pass through, the circuit protection board 3 has an extension portion 3a extending toward the avoidance hole 4a, and a contact sheet (not shown) is provided on the back of the extension portion 3a.

[0041] During assembly, align the spring piece 51 of the positive electrode cover plate 5 with the avoidance hole 4a of the plastic cap 4, and after the lower end of the spring piece 51 passes through the avoidance hole 4a, the positive electrode cover plate 5 is fixed on the top of the plastic cap 4. Then, align the extension part 3a of the circuit protection board 3 with the avoidance hole 4a, and insert the extension part 3a into the avoidance hole 4a, so that the spring piece 51 and the back of the extension part 3a are provided with a contact sheet, so that the circuit protection board 3 and the positive electrode cover plate 5 are electrically connected, thereby guiding the positive electrode of the battery cell 2 to the positive electrode cover plate 5.

[0042] Alternatively, if Figure 4 As shown, in this embodiment, the spring sheet 51 has a first elastic arm 51a bent along the central axis of the positive electrode cover plate 5, and the end of the first elastic arm 51a is folded outward relative to the central axis of the positive electrode cover plate 5 to form a second elastic arm 51c, and an arc arm 51b is provided between the first elastic arm 51a and the second elastic arm 51c.

[0043] After the spring sheet 51 passes through the avoidance hole 4a, its arc-shaped arm 51b protrudes toward the center of the avoidance hole 4a. In this way, when the extension portion 3a of the circuit protection board 3 is inserted into the avoidance hole 4a, the circuit protection board 3 contacts the arc-shaped arm 51b and pushes the arc-shaped arm 51b outward, and the first elastic arm 51a applies a reaction force to the arc-shaped arm 51b, so that the arc-shaped arm 51b is pressed tightly against the contact piece of the extension portion 3a, ensuring good contact between the spring sheet 51 and the contact piece.

[0044] In this embodiment, the edge of the positive electrode cover plate 5 is further provided with a buckle piece 52 extending downward along its axis, and the cap of the plastic cap 4 is provided with a through hole 4e for the buckle piece 52 to pass through. After the spring piece 51 of the positive electrode cover plate 5 passes through the avoidance hole 4a, the buckle piece 52 of the positive electrode cover plate 5 passes through the through hole 4e. Then, the buckle piece 52 only needs to be folded toward the bottom surface of the cap of the plastic cap 4 to buckle the positive electrode cover plate 5 on the plastic cap 4.

[0045] Furthermore, if Figure 4 As shown, a protrusion 4b is provided at a position corresponding to the avoidance hole 4a, one end of the protrusion 4b is connected to the inner wall of the plastic cap 4, and the other end thereof extends toward the center of the plastic cap 4.

[0046] During assembly, the spring sheet 51 of the positive electrode cover plate 5 can be first inserted into the avoidance hole 4a of the plastic cap 4 in an inclined posture, so that the end of the second elastic arm 51c of the spring sheet 51 first contacts the left end surface of the protrusion 4b, and then the positive electrode cover plate 5 is pressed downward onto the plastic cap 4, so that the second elastic arm 51c of the spring sheet 51 contacts the lower part of the left end surface of the protrusion 4b. Thus, when the extension 3a of the circuit protection board 3 pushes the arc-shaped arm 51b outward and the first elastic arm 51a applies a reaction force to the arc-shaped arm 51b, the second elastic arm 51c will also apply a reaction force to the arc-shaped arm 51b under the action of the protrusion 4b, thereby further ensuring good contact between the arc-shaped arm of the spring sheet 51 and the contact sheet.

[0047] Meanwhile, in the present embodiment, the upper side surface of the protrusion 4b is set as an inclined surface 4c, and the inclined surface 4c is inclined downward from the inner wall side of the plastic cap 4. In this way, during assembly, it is not necessary to insert the spring piece 51 of the positive electrode cover plate 5 into the avoidance hole 4a of the plastic cap 4 in an inclined posture, and it is only necessary to roughly align the spring piece 51 with the avoidance hole 4a. When the spring piece 51 is inserted into the avoidance hole 4a, the second elastic arm 51c of the spring piece 51 first contacts the inclined surface 4c, and the inclined surface 4c can guide the spring piece 51 to move toward the center side of the avoidance hole 4a, so as to facilitate the assembly between the positive electrode cover plate 5 and the plastic plate and reduce the difficulty of assembly.

[0048] Alternatively, if Figure 4-6 As shown, in this embodiment, two oppositely arranged bayonet holes 4d are provided at the bottom of the cap of the plastic cap 4. After the circuit protection board 3 passes through the avoidance hole 4a of the plastic cap 4, the two sides of the upper end of the circuit protection board 3 are engaged in the two bayonet holes 4d, so that the circuit protection board 3 is firmly plugged into the plastic cap 4, so that the plastic cap 4 and the circuit protection board 3 can form a whole, which provides convenience for subsequent battery assembly.

[0049] Alternatively, if Figure 2As shown, in this embodiment, an extension portion 4g extending downward along the axial direction is provided on the circumferential side of the plastic cap 4. When the assembly formed by the plastic cap 4 and the circuit protection board 3 is assembled with the battery cell 2, after the needle-shaped pole ear of the battery cell 2 and the needle sleeve on the circuit protection board 3 are completely engaged, the end of the extension portion 4g will abut against the upper end surface of the battery cell 2 to avoid excessive assembly force causing compression damage to the circuit protection board 3 between the plastic cap 4 and the battery cell 2.

[0050] In this embodiment, the extension portion 4 g is slightly inclined toward the central axis of the plastic cap 4 , so that the lower end portion of the extension portion 4 g can effectively abut against the upper end surface of the battery core 2 .

[0051] Alternatively, if Figure 1 As shown, in this embodiment, the peripheral side wall of the plastic cap 4 has two oppositely arranged convex ears 4f, and the peripheral wall of the opening of the steel housing 1 has concave ears 1a corresponding to the convex ears 4f. During assembly, the convex ears 4f of the plastic cap 4 are aligned with the concave ears 1a of the opening of the steel housing 1, so that the convex ears 4f are engaged in the corresponding concave ears 1a, thereby limiting the rotation of the plastic cap 4 relative to the steel housing 1.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to be construed as limiting the present invention. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A rechargeable battery, comprising a steel shell, a battery cell, a circuit protection board, a plastic cap, and a positive electrode cover, wherein the battery cell is inserted into the steel shell, the plastic cap is inserted into the opening of the steel shell, the circuit protection board is clamped between the battery cell and the plastic cap, and the positive electrode cover is sealed on the top of the plastic cap; characterized in that: The battery cell has a needle-shaped pole ear extending outward from the battery cell body; the circuit protection board is arranged along the axial direction of the battery cell, and a needle sleeve matching the needle-shaped pole ear is welded on the front side thereof, and the battery cell and the circuit protection board are electrically connected through the insertion of the needle-shaped pole ear and the needle sleeve; The needle sleeve has a curled portion and a flat portion tangent to the curled portion, the flat portion is welded to the circuit protection board, and the needle-shaped pole ear is inserted into a middle hole formed by the curled portion; The flat surface of one of the needle sleeves extends to the outside of the circuit protection board, and the end of the flat surface is folded upward relative to the front surface of the circuit protection board to form a bent portion, and a plurality of contact convex points are convexly provided on the outer side surface of the bent portion. When the circuit protection board is plugged into the steel shell, the contact convex points are in frictional contact with the inner wall of the steel shell to form an electrical connection; The bending portion is arranged to be inclined toward one side of the curling portion; The positive electrode cover plate has a spring sheet extending downward, the plastic cap has a avoidance hole for the spring sheet to pass through, the circuit protection board has an extension portion extending toward the avoidance hole, and a contact sheet is provided on the back of the extension portion; after the spring sheet passes through the avoidance hole, it is crimped onto the contact sheet to form an electrical connection with the circuit protection board.

2. The recyclable rechargeable battery according to claim 1, characterized in that: The elastic sheet has a first elastic arm bent outward from the central axis of the positive electrode cover plate, the end of the first elastic arm is folded outward relative to the central axis of the positive electrode cover plate to form a second elastic arm, and an arc arm is provided between the first elastic arm and the second elastic arm; After the spring piece passes through the avoidance hole, the arc-shaped arm is pressed onto the contact piece.

3. The recyclable rechargeable battery according to claim 2, characterized in that: The inner wall of the plastic cap has a protrusion extending toward the center thereof, and the protrusion is located below the avoidance hole. After the spring sheet is inserted into the avoidance hole, the second elastic arm of the spring sheet passes through the protrusion and contacts the lower side of the end of the protrusion.

4. The recyclable rechargeable battery according to claim 3, characterized in that: The upper side surface of the protrusion is an inclined surface, and the inclined surface is inclined downward from one side of the inner wall of the plastic cap.

5. The recyclable rechargeable battery according to claim 3 or 4, characterized in that: The bottom of the plastic cap has two oppositely arranged bayonet holes, the two sides of the upper end of the circuit protection board are engaged in the two bayonet holes of the bayonet holes, and the extension part passes through the avoidance hole of the plastic cap.

6. The recyclable rechargeable battery according to claim 1, characterized in that: The circumferential side of the plastic cap has an extension portion extending downward along its axial direction. When the upper end of the circuit protection board is engaged on the plastic board, the lower end of the extension portion is flush with the lower end surface of the circuit protection board.

7. The recyclable rechargeable battery according to claim 6, characterized in that: The extension portion is arranged to be inclined toward the central axis of the plastic cap.

8. The recyclable rechargeable battery according to claim 1, characterized in that: The peripheral side wall of the plastic cap has two oppositely arranged convex ears, and the peripheral wall of the opening of the steel shell has concave ears corresponding to the convex ears.

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