Cylindrical battery

Abstract

The utility model discloses a cylindrical battery which comprises a battery shell and a battery cover assembly, and the battery cover assembly is combined at the first end of the battery shell in a sealing manner; the battery cover assembly comprises an insulating sleeve, a metal sleeve, a protective sleeve, a circuit board and a positive electrode cap, the insulating sleeve, the metal sleeve and the insulating sleeve are mutually clamped, the metal sleeve is provided with a first accommodating part, the protective sleeve is provided with a second accommodating part, the protective sleeve and the metal sleeve are mutually clamped, and the second accommodating part is arranged in an inner cavity of the first accommodating part; an electronic element on the first surface of the circuit board is located in an inner cavity of the second containing part, the positive electrode cap is connected with the second surface of the circuit board, and the positive electrode assembly is electrically connected with the positive electrode cap. The first accommodating part and the second accommodating part form a mutually nested structure, the structural rigidity of the first accommodating part and the second accommodating part is ensured, and the electronic element of the circuit board can be accommodated in the inner cavity of the second accommodating part, so that the space occupied by the battery cover assembly on the battery shell can be reduced, the volume of the battery core can be further increased, and the energy density of the cylindrical battery is further increased.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery. Background Technology

[0002] Cylindrical batteries of related technologies, such as AA or AAA batteries, generally include a battery casing, a battery cell housed within the casing, and a battery cover structure. The battery cover typically includes a circuit board and several metal plates. These metal plates are generally plate-shaped structures, and the circuit board houses several electronic components. As a result, when the several metal plates and the circuit board are assembled into the battery casing, their cumulative height is relatively large, which occupies the internal space of the battery casing and encroaches on the space for the battery cell and electrolyte. This leads to a reduction in the volume of the battery cell and consequently, a decrease in the overall energy density of the cylindrical battery. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cylindrical battery.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a cylindrical battery, including a battery shell and a battery cover assembly. The battery shell has a first end and a second end opposite to each other. A battery cell is provided inside the battery shell. The battery cell includes a negative electrode assembly and a positive electrode assembly with opposite polarities. The negative electrode assembly is electrically connected to the battery shell.

[0005] The battery cover assembly is sealed and joined to the first end of the battery casing; the battery cover assembly includes an insulating sleeve, a metal sleeve, a protective sleeve, a circuit board, and a positive electrode cap. The insulating sleeve and the metal sleeve are interlocked with each other. The metal sleeve has a first receiving portion recessed towards the second end, and the protective sleeve has a second receiving portion recessed towards the second end. The protective sleeve and the metal sleeve are sleeved together, and the second receiving portion is located in the inner cavity of the first receiving portion. The circuit board has a first surface and a second surface opposite to each other. The electronic components on the first surface of the circuit board are located in the inner cavity of the second receiving portion. The positive electrode cap is connected to the second surface of the circuit board, and the positive electrode assembly is electrically connected to the positive electrode cap.

[0006] In some embodiments, the second receiving portion is provided with a plurality of clearance holes.

[0007] In some embodiments, the sidewalls and / or bottom wall of the second receiving portion are provided with the clearance holes.

[0008] In some embodiments, the insulating sleeve is a hollow cylinder, the inner wall of the insulating sleeve is provided with a first groove, and the metal sleeve includes a first annular portion and a first receiving portion connected to the first annular portion, wherein the first annular portion and the first groove are engaged with each other.

[0009] In some embodiments, the lower edge of the insulating sleeve further extends a limiting portion, which abuts against the outer side of the first receiving portion.

[0010] In some embodiments, the inner sidewall of the first annular portion is provided with a second groove;

[0011] The protective sleeve includes a second annular portion and a second receiving portion connected to the second annular portion, wherein the second annular portion and the second groove are engaged with each other.

[0012] In some embodiments, the inner diameter of the insulating sleeve is larger than the inner diameter of the first annular portion, and the first surface of the circuit board is mounted on the portion of the first annular portion exposed in the inner cavity of the insulating sleeve.

[0013] In some embodiments, the battery cover assembly further includes a metal sheet and an insulating sheet, both of which are annular in shape, and the insulating sheet is sealed together with the end face of the first end of the battery case by means of the metal sheet.

[0014] In some embodiments, the outer side wall of the first end of the battery case near its end is recessed to form a receiving cavity at the first end of the battery case, and the battery cover assembly is disposed in the receiving cavity.

[0015] In some embodiments, the circuit board is provided with a DC-DC voltage conversion unit.

[0016] The present invention offers the following advantages: The battery cover assembly of the cylindrical battery employs a combination structure of a metal sleeve and a protective sleeve. The first accommodating portion and the second accommodating portion form a nested structure, ensuring structural rigidity. Furthermore, the electronic components of the circuit board can be housed within the cavity of the second accommodating portion. Therefore, the overall height of the battery cover assembly can be reduced, minimizing the space occupied by the battery cover assembly on the battery casing, thereby increasing the volume of the battery cell and further enhancing the energy density of the cylindrical battery. When multiple cylindrical batteries are connected in series as a battery pack or battery module, the accumulated battery energy density is even more significant, effectively increasing the overall battery capacity of the battery pack or battery module. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the cylindrical battery structure in some embodiments of this utility model;

[0019] Figure 2 This is a cross-sectional view of a cylindrical battery in some embodiments of this utility model;

[0020] Figure 3 This is a schematic diagram of the battery casing in some embodiments of this utility model;

[0021] Figure 4 This is an exploded view of the battery cover assembly in some embodiments of the present invention;

[0022] Figure 5 This is an exploded view of the battery cover assembly in some other embodiments of the present invention. Detailed Implementation

[0023] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0024] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0026] See Figures 1 to 2 This utility model discloses a cylindrical battery, which can be of various models including but not limited to 14650, 14500 (AA battery), 18650, 21700, etc., or other cylindrical battery models and specifications. The cylindrical battery can be a lithium-ion battery, and it can be a rechargeable battery. This cylindrical battery can be used in electronic devices, including but not limited to pagers, smartwatches, or smart bracelets. Furthermore, it can also be used in battery packs or battery modules (such as power batteries).

[0027] In some embodiments, the cylindrical battery includes a battery casing 10 and a battery cover assembly 20, the battery casing 10 having opposing first ends 10a and second ends 10b (combined) Figure 3 As shown, the first end 10a is used to assemble with the battery cover assembly 20, and the second end 10b can be a closed end. The battery casing 10 contains a battery cell 30, which is generally cylindrical and can be coaxially arranged with the battery casing 10. The battery cell 30 may include a negative electrode assembly and a positive electrode assembly with opposite polarities. The negative electrode assembly and the positive electrode assembly can be wound together with an insulating assembly. The negative electrode assembly includes at least one negative electrode sheet, the positive electrode assembly includes at least one positive electrode sheet, and the insulating assembly includes at least one separator sheet. The negative electrode assembly is electrically connected to the battery casing 10, for example, by welding the negative electrode assembly to the second end 10b of the battery casing 10 via a negative electrode tab, such as by laser welding or ultrasonic welding.

[0028] The battery cover assembly 20 is sealed and joined to the first end 10a of the battery housing 10, such as Figure 3 As shown, the outer side wall of the first end 10a of the battery case 10 is recessed inward near its end to form a receiving cavity 11 at the first end 10a of the battery case 10, and the battery cover assembly 20 is disposed in the receiving cavity 11.

[0029] The battery cover assembly 20 includes an insulating sleeve 21, a metal sleeve 22, a protective sleeve 23, a circuit board 24, and a positive electrode cap 25. The insulating sleeve 21 and the metal sleeve 22 are interlocked with each other. The metal sleeve 22 is generally cylindrical and has a first receiving portion 222 recessed towards the second end 10b. The protective sleeve 23 is also generally cylindrical and has a second receiving portion 232 recessed towards the second end 10b. The protective sleeve 23 and the metal sleeve 22 are interlocked, and the second receiving portion 232 is located within the cavity of the first receiving portion 222. The circuit board... Circuit board 24 has a first surface and a second surface. The electronic components on the first surface of the circuit board 24 are located in the cavity of the second accommodating portion 232. The positive electrode cap 25 is connected to the second surface of the circuit board 24. The positive electrode assembly is electrically connected to the positive electrode cap 25. For example, the positive electrode ear of the positive electrode assembly can be welded and fixed to the metal sleeve 22. The metal sleeve 22 is electrically connected to the protective sleeve 23. The metal sleeve 22 or the protective sleeve 23 is electrically connected to the circuit board 24, and the positive electrode cap 25 is electrically connected to the circuit board 24. Thus, the positive electrode assembly is electrically connected to the positive electrode cap 25.

[0030] The battery cover assembly 20 of the cylindrical battery adopts a combination structure of the metal sleeve 22 and the protective sleeve 23. The first accommodating part 222 and the second accommodating part 232 form a nested structure to ensure the structural rigidity of both. The electronic components of the circuit board 24 can be housed in the cavity of the second accommodating part 232. Therefore, the overall height of the battery cover assembly 20 can be reduced, and the space occupied by the battery cover assembly 20 on the battery casing 10 can be reduced. This, in turn, can increase the volume of the cell 30, thereby further increasing the energy density of the cylindrical battery. When multiple cylindrical batteries are connected in series as a battery pack or battery module (such as a power battery), the accumulated battery energy density is more significant, which can effectively increase the overall battery capacity of the battery pack or battery module.

[0031] In some embodiments, the second accommodating portion 232 is provided with a plurality of clearance holes 233. When the internal pressure of the battery case 10 increases, part of the structure of the metal sleeve 22 can deform toward the clearance holes 233, thereby achieving an explosion-proof effect.

[0032] In some embodiments, the sidewall and / or bottom wall of the second receiving portion 232 are provided with the clearance hole 233. For example, the bottom wall of the second receiving portion 232 is provided with the clearance hole 233 (e.g. Figure 5 As shown), the number of clearance holes 233 can be one or more, such as two, three, four, or any other arbitrary number, without specific limitation here. Alternatively, the side wall of the second receiving portion 232 is provided with the clearance holes 233 (e.g., Figure 5 As shown, the number of the clearance holes 233 can be one or more, such as two, three, four or any other number, without specific limitation here.

[0033] like Figure 2 and Figure 4 As shown, the insulating sleeve 21 is a hollow cylinder. The inner wall surface of the insulating sleeve 21 is provided with a first groove 211. The first groove 211 can be an annular groove structure. The metal sleeve 22 includes a first annular portion 221 and a first receiving portion 222 connected to the first annular portion 221. The first annular portion 221 and the first groove 211 are engaged with each other.

[0034] In some embodiments, the lower edge of the insulating sleeve 21 further extends a limiting portion 212, which may be an annular structure. The limiting portion 212 abuts against the outer surface of the first accommodating portion 222, and can assist in limiting the first accommodating portion 222. In addition, the limiting portion 212 can also act as an isolation to prevent the first accommodating portion 222 from contacting the inner wall of the battery casing 10. Preferably, the insulating sleeve 21 may be, but is not limited to, a rubber sleeve, such as a silicone sleeve or a rubber sleeve. The metal sleeve 22 may be, but is not limited to, an aluminum sleeve. The protective sleeve 23 may be, but is not limited to, a steel sleeve. Of course, the materials of the insulating sleeve 21, the metal sleeve 22, and the protective sleeve 23 can also be selected and set according to actual needs, and no specific limitation is made here.

[0035] In some embodiments, the inner sidewall of the first annular portion 221 is provided with a second groove 2211, and the protective sleeve 23 includes a second annular portion 231 and a second receiving portion 232 connected to the second annular portion 231, wherein the second annular portion 231 and the second groove 2211 are engaged with each other.

[0036] In some embodiments, the inner diameter of the insulating sleeve 21 is larger than the inner diameter of the first annular portion 221, and the first surface of the circuit board 24 is mounted on the portion of the first annular portion 221 exposed in the inner cavity of the insulating sleeve 21 (in combination with...). Figure 2 (As shown).

[0037] In some embodiments, the battery cover assembly 20 further includes a metal sheet 26 and an insulating sheet 27, both of which are annular in structure. The insulating sheet 27 is sealed to the end face of the first end 10a of the battery casing 10 via the metal sheet 26. For example, the insulating sheet 27 may be laser-welded or thermally fused to the metal sheet 26, and the metal sheet 26 may be laser-welded or thermally fused to the end face of the first end 10a of the battery casing 10; no specific limitation is made here. Furthermore, the inner diameter of the metal sheet 26 is larger than the inner diameter of the insulating sheet 27, so that the metal sheet 26 does not contact the positive electrode cap 25, while the insulating sheet 27 can be fitted around the outer periphery of the positive electrode cap 25, providing a sealing effect. In some embodiments, the portion of the insulating sheet 27 near its hollow inner cavity may also be sealed to a portion of the structure of the positive electrode cap 25, for example, by laser welding, to improve overall sealing. Preferably, the metal sheet 26 includes, but is not limited to, a steel sheet, and the insulating sheet 27 includes, but is not limited to, a plastic sheet.

[0038] In some embodiments, the circuit board 24 is provided with a DC-DC voltage conversion unit for voltage conversion. Furthermore, the circuit board 24 may also include a filter circuit, a voltage regulator circuit, etc., and the circuit board 24 has charge / discharge control and protection functions. The DC-DC voltage conversion unit, filter circuit, voltage regulator circuit, etc., can be implemented using existing technologies, and are not specifically limited here. Preferably, the circuit board 24 may be, but is not limited to, a PCB board.

[0039] In some embodiments, the positive electrode cap 25 is soldered and fixed to the second surface of the circuit board 24, the second surface of the circuit board 24 ( Figure 4 At least a portion of the electronic components (on the upper surface of the positive electrode cap 25) can extend into the inner cavity of the positive electrode cap 25.

[0040] In some embodiments, the battery casing 10 has an outer diameter of approximately 13.8 mm, a wall thickness of approximately 0.2 mm, a height before compression of approximately 50.7 mm, and a height after compression of approximately 48.2 mm. The insulating sleeve 21 has an outer diameter of approximately 13.3 mm, an overall thickness of approximately 3.4 mm, and an overall wall thickness of approximately 0.6 mm. The metal sleeve 22 has an outer diameter of approximately 12.2 mm, an overall thickness of approximately 3 mm, and an overall wall thickness of approximately 0.35 mm. The protective sleeve 23 has an outer diameter of approximately 11.3 mm, an overall thickness of approximately 2.3 mm, and an overall wall thickness of approximately 0.3 mm. The circuit board 24 has an outer diameter or diameter of approximately 10 mm and an overall thickness of approximately 0.8 mm. The positive electrode cap 25 has an overall outer diameter of approximately 6.9 mm, an overall thickness of approximately 1.8 mm, and a wall thickness of approximately 0.3 mm. The metal sheet 26 has an outer diameter of approximately 13.5 mm, an inner diameter of approximately 8 mm, and a thickness of approximately 0.3 mm. The outer diameter of the insulating sheet 27 is approximately 13.6 mm, the inner diameter is approximately 5.6 mm, and the thickness is approximately 0.2 mm.

[0041] Of course, the size of the cylindrical battery can be adjusted according to actual needs, and no specific limit is set here.

[0042] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A cylindrical battery, characterized by comprising: Includes a battery case (10) and a battery cover assembly (20). The battery case (10) has a first end (10a) and a second end (10b) opposite to each other. A battery cell (30) is provided inside the battery case (10). The battery cell (30) includes a negative electrode assembly and a positive electrode assembly with opposite polarities. The negative electrode assembly is electrically connected to the battery case (10). The battery cover assembly (20) is sealed to the first end (10a) of the battery casing (10); the battery cover assembly (20) includes an insulating sleeve (21), a metal sleeve (22), a protective sleeve (23), a circuit board (24), and a positive electrode cap (25). The insulating sleeve (21) and the metal sleeve (22) are interlocked with each other. The metal sleeve (22) has a first receiving portion (222) recessed toward the second end (10b), and the protective sleeve (23) has a first receiving portion (222) recessed toward the second end (10b). b) A recessed second receiving portion (232), the protective sleeve (23) and the metal sleeve (22) are sleeved together and the second receiving portion (232) is located in the inner cavity of the first receiving portion (222), the circuit board (24) has a first surface and a second surface opposite to each other, the electronic components of the first surface of the circuit board (24) are located in the inner cavity of the second receiving portion (232), the positive electrode cap (25) is connected to the second surface of the circuit board (24), and the positive electrode assembly is electrically connected to the positive electrode cap (25).

2. The cylindrical battery according to claim 1, characterized by The second receiving portion (232) is provided with a plurality of clearance holes (233).

3. The cylindrical battery according to claim 2, characterized by, The second receiving portion (232) has the clearance hole (233) on its side wall and / or bottom wall.

4. The cylindrical battery according to claim 1, characterized by, The insulating sleeve (21) is a hollow cylinder. The inner wall of the insulating sleeve (21) is provided with a first groove (211). The metal sleeve (22) includes a first annular portion (221) and a first receiving portion (222) connected to the first annular portion (221). The first annular portion (221) and the first groove (211) are engaged with each other.

5. The cylindrical battery according to claim 4, characterized by The lower edge of the insulating sleeve (21) also extends a limiting portion (212), which abuts against the outer surface of the first receiving portion (222).

6. The cylindrical battery according to claim 4, characterized by The inner wall of the first annular portion (221) is provided with a second groove (2211). The protective sleeve (23) includes a second annular portion (231) and a second receiving portion (232) connected to the second annular portion (231), wherein the second annular portion (231) and the second groove (2211) are engaged with each other.

7. The cylindrical battery according to claim 4, characterized by The inner diameter of the insulating sleeve (21) is larger than the inner diameter of the first annular portion (221), and the first surface of the circuit board (24) is mounted on the portion of the first annular portion (221) that is exposed in the inner cavity of the insulating sleeve (21).

8. The cylindrical battery according to claim 1, characterized by, The battery cover assembly (20) also includes a metal sheet (26) and an insulating sheet (27), both of which are annular in shape. The insulating sheet (27) is sealed together with the end face of the first end (10a) of the battery case (10) through the metal sheet (26).

9. The cylindrical battery according to claim 1, wherein The outer side wall of the first end (10a) of the battery case (10) is recessed inward near its end to form a receiving cavity (11) at the first end (10a) of the battery case (10), and the battery cover assembly (20) is disposed in the receiving cavity (11).

10. The cylindrical battery according to claim 1, characterized by The circuit board (24) is equipped with a DC-DC voltage conversion unit.

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