Roll-slot-free battery

Abstract

The invention relates to a non-channeling battery. The non-channeling battery comprises a cap, an external gasket, a shell and a roll core, wherein the roll core is accommodated in the shell, and the cap is electrically connected to the roll core; the top of the shell is bent inwards to tightly press the external gasket on the cap, so that the roll core is fixed in the shell; the shell is not provided with a rolling groove structure. Wherein the outer gasket comprises an outer gasket top, the outer gasket top is of a circular ring structure, and the cap is exposed from a middle circular notch; and the outer gasket bottom is arranged between the cap and the shell. On the basis of effectively fixing and sealing the battery roll core, the overall height of the cap and other structures is reduced, so that the height of the roll core and the electrolyte injection amount are increased, the total capacity of the battery is increased, and meanwhile, the production cost is saved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery without rolling grooves. Background Art

[0002] Batteries are energy supply units for various electronic devices and products. In order to ensure the long-term operation of electronic equipment, batteries need to have high energy density and battery capacity. Conventional batteries mainly include caps, shells, cores and electrolytes. Under the limitation of a certain battery volume, in order to improve the space utilization in the battery shell, including increasing the height of the core and the amount of electrolyte injection, it is necessary to minimize the height of structures such as caps.

[0003] In the existing battery structure design, the cap and the core are usually connected through the extension of the positive busbar (ear), and during the installation of the cap, the ear needs to be folded to accommodate between the cap and the core, which will occupy the internal height of the battery. In addition, the existing battery structure design usually has a rolling groove on the battery shell, which is located between the core and the cap, and is used to fix the core inside the shell without shaking. In the existing rolling groove process, a roller is usually used to contact the rolling battery shell, so as to roll out a circle of grooves on the battery shell. This method requires controlling the lateral extrusion speed and the longitudinal downward pressure speed, which may cause the ear to be twisted and the shell to be damaged, thereby posing a safety hazard to the battery. At the same time, the rolling groove structure will also occupy the internal height of the battery, affecting the height of the core and the injection amount of the electrolyte, thereby reducing the overall capacity of the battery.

[0004] Therefore, it is necessary to provide a non-grooved battery to at least partially solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a battery without rolling grooves, which can reduce the overall height of the cap and other structures on the basis of achieving effective fixation and sealing of the battery core, so as to increase the core height and the amount of electrolyte injection, thereby increasing the overall capacity of the battery. The present invention reduces the risk of damage to the battery casing by adopting a design without rolling grooves, and eliminates the rolling groove process steps, saving production costs. At the same time, the present invention adopts a new busbar structure and its connection method with the cap, which not only simplifies the busbar structure and avoids large deformation of the busbar, but also increases the welding area of ​​the busbar and improves the current carrying capacity.

[0006] According to one aspect of the present invention, there is provided a battery, comprising: a cap, an external gasket, a housing and a winding core;

[0007] wherein the winding core is accommodated in the housing, and the cap is electrically connected to the winding core;

[0008] The top of the shell is bent inwardly to press the outer gasket tightly against the cap, thereby fixing the winding core in the shell;

[0009] The housing does not have a roll groove structure.

[0010] In one embodiment, the outer gasket comprises:

[0011] The top of the external gasket is a circular ring structure, and the cap is exposed from the circular notch in the middle;

[0012] The outer gasket bottom is arranged between the cap and the outer shell.

[0013] In one embodiment, the cap comprises:

[0014] Top cover;

[0015] An explosion-proof valve plate, which is arranged below the top cover and is electrically connected to the top cover;

[0016] An orifice plate, the orifice plate being arranged below the explosion-proof valve plate; the orifice plate and the explosion-proof valve plate being electrically connected at the center and separated at the peripheral position with a gap;

[0017] An internal gasket is used to seal the gap between the explosion-proof valve plate and the outer periphery of the orifice plate.

[0018] In one embodiment, the outer circumferences of the orifice plate, the top cover and the explosion-proof valve plate decrease in sequence.

[0019] In one embodiment, the internal gasket includes an internal gasket bottom and an internal gasket side wall, the internal gasket bottom is a circular ring structure, and the top of the internal gasket side wall is pressed against the lower surface of the top cover.

[0020] In one embodiment, the height of the inner gasket side wall is slightly greater than the thickness of the explosion-proof valve plate, and the inner diameter of the inner gasket side wall is slightly smaller than the diameter of the explosion-proof valve plate.

[0021] In one embodiment, the outer gasket further comprises an outer gasket side wall, wherein the outer gasket side wall is used to connect the outer gasket top and the outer gasket bottom.

[0022] In one embodiment, a circle of upward flange is provided on the outer periphery of the top cover, and the top of the flange is pressed against the lower surface of the top of the external gasket.

[0023] In one embodiment, the top of the housing is bent inwardly to press the outer gasket against the top of the flange and the upper surface of the top cover near the flange.

[0024] In one embodiment, a lower surface of the top of the outer gasket is provided with a circumference of downward protrusions, and the protrusions are located on the inner side of the flange.

[0025] In one embodiment, the top of the housing is bent inwardly to press the protrusion tightly against the flange side wall.

[0026] In one embodiment, the outer diameter of the upper portion of the external gasket is smaller than the outer diameter of the lower portion thereof, and the outer surface of the upper portion of the external gasket is connected to the outer surface of the lower portion thereof via an inclined surface.

[0027] In one embodiment, after the shell is bent, the outer gasket has a portion extending out of the shell.

[0028] In one embodiment, an upward groove is provided at the center of the explosion-proof valve plate, and a downward groove is provided at the center of the orifice plate, and the downward groove is connected to the upward groove by welding; the upward groove or the downward groove has a boss structure.

[0029] In one embodiment, the thickness of the bottom of the inner gasket is slightly greater than the height of the boss structure.

[0030] In one embodiment, the upper surface of the explosion-proof valve plate is provided with a circle of explosion-proof grooves.

[0031] In one embodiment, the explosion-proof valve plate is connected to the top cover by wire welding, and the wire welding is continuous or segmented.

[0032] In one embodiment, a positive busbar is further included, wherein the positive busbar includes a portion connected to the winding core and a portion connected to the cap, and the cap connection portion is located at the periphery of the portion connected to the winding core.

[0033] In one embodiment, the cap connecting portion is provided with a peripheral ridge.

[0034] In one embodiment, the orifice plate is connected to the ridge by welding, and the welding track is located on the ridge.

[0035] In one embodiment, the orifice plate is connected to the cap connection portion of the positive busbar by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0037] Figure 1 A schematic structural diagram of a non-grooved battery according to a preferred embodiment of the present invention;

[0038] Figure 2 An exploded view of a non-grooved battery according to a preferred embodiment of the present invention;

[0039] Figure 3 A cross-sectional view of a non-grooved battery according to a preferred embodiment of the present invention;

[0040] Figure 4 is a cross-sectional view of a cap according to a preferred embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the structure of a hole plate according to a preferred embodiment of the present invention (top view);

[0042] Figure 6 Schematic diagram of the structure of a hole plate according to a preferred embodiment of the present invention (viewed from above);

[0043] Figure 7 A schematic structural diagram of a positive electrode bus bar according to a preferred embodiment of the present invention;

[0044] Figure 8 A schematic structural diagram of a positive electrode bus bar according to another preferred embodiment of the present invention;

[0045] Fig. 9 FIG. 1 is a schematic structural diagram of a positive electrode busbar according to another preferred embodiment of the present invention.

[0046] Reference numerals:

[0047] 1 Block

[0048] 11 Top cover

[0049] 111 flange

[0050] 112 wire welding

[0051] 12 explosion-proof valve plate

[0052] 121 Upward groove

[0053] 122 boss structure

[0054] 13-well plate

[0055] 131 Downward groove

[0056] 132 hole plate explosion-proof slot

[0057] 133 welding track

[0058] 14 Internal gasket

[0059] 141 Internal gasket bottom

[0060] 142 Internal gasket side wall

[0061] 2 Shell

[0062] 3 cores

[0063] 4 Positive busbar

[0064] 41 core connection part

[0065] 42 Cap connection part

[0066] 421 ridges

[0067] 5 Negative busbar

[0068] 6 External gasket

[0069] 61 External gasket top

[0070] 62 External gasket side wall

[0071] 63 External gasket bottom

[0072] 64 bulge

[0073] 65 bevel DETAILED DESCRIPTION

[0074] Now, with reference to the accompanying drawings, the specific embodiments of the present invention are described in detail. What is described here is only the preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiment, and the other ways also fall into the scope of the present invention. In some embodiments, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0075] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by those of ordinary skill in the art. In the event of conflict, the present invention (including definitions) shall prevail. Only exemplary methods and materials are described below, and methods and materials similar or equivalent to those described in the present invention can be used for experiments or tests of the present invention. The materials, methods and examples disclosed in the present invention are illustrative only and are not intended to be limiting. For the description of the numerical range of the present invention, each intermediate number with the same degree of accuracy is clearly expected therebetween.

[0076] Figure 1-Figure 9 The preferred embodiment of the non-grooved battery according to the present invention is shown. First of all, it should be noted that the directional terms and position terms in the present invention should be understood as relative directions and positions, rather than absolute directions and positions. The directional terms and position terms in the present invention can refer to Figure 1-Figure 9 The exemplary structure shown is explained.

[0077] The existing battery structure design usually has a rolling groove structure on the battery shell to fix the core inside the shell without shaking. In addition, in the existing battery structure design, the cap and the core are connected by the pole ear, and the pole ear needs to be folded and accommodated between the cap and the core. In the existing rolling groove process, a roller is usually used to contact the rolling battery shell, which may cause the pole ear to be twisted and the shell to be damaged. At the same time, the rolling groove and the folding of the pole ear will also affect the height of the core and the injection amount of the electrolyte, thereby reducing the overall capacity of the battery.

[0078] In view of the above technical problems, the present invention provides a battery without rolling grooves. Figure 1-Figure 3 A non-grooved battery according to a preferred embodiment of the present invention comprises a cap 1, an external gasket 6, an outer shell 2 and a roll core 3; wherein the roll core 3 is accommodated in the outer shell 2, and the cap 1 is electrically connected to the roll core 3; the top of the outer shell 2 is bent inward to press the external gasket 6 tightly against the cap 1, thereby fixing the roll core 3 in the outer shell 2; the outer shell 2 does not have a roll groove structure.

[0079] It should be noted that although Figure 1-Figure 9 The battery caps shown are all cylindrical, but those skilled in the art will understand that the groove-free battery structure described in the present invention can also be applied to square batteries. For square batteries, it is only necessary to convert the structure in the figure from a circle to a corresponding square. In order to ensure the technical effect of the present invention during the conversion process, the square structure will be appropriately adjusted. For example, when the external gasket 6 is converted from a circular ring to a square, its sealing must be ensured by structural design. The above conversion and adjustment are routine operations for those skilled in the art, and no creative work is required.

[0080] Please refer to Figure 3 and Figure 4 In one embodiment, the cap 1 of the present invention includes: a top cover 11; an explosion-proof valve plate 12, which is arranged below the top cover 11 and electrically connected to the top cover 11; a hole plate 13, which is arranged below the explosion-proof valve plate 12; the hole plate 13 is electrically connected to the explosion-proof valve plate 12 at the center position and is separated from the explosion-proof valve plate 12 by a gap at the peripheral position; an internal gasket 14, which is used to seal the gap between the explosion-proof valve plate 12 and the outer periphery of the hole plate 13.

[0081] In the prior art, the outer circumference of the explosion-proof valve plate is usually larger than that of the top cover, and the outer circumference of the explosion-proof valve plate will cover the outer circumference of the top cover to obtain better sealing, but this also increases the height of the explosion-proof valve plate. Different from this, as a preferred embodiment, the outer circumferences of the orifice plate 13, the top cover 11 and the explosion-proof valve plate 12 of the present invention are reduced in sequence, such as Figure 3 and Figure 4 As will be described in detail below, these dimensions can meet the sealing requirements and minimize the height of the cap.

[0082] The outer peripheral size mentioned in the present invention refers to the outer edge size of the component, which corresponds to the diameter of a cylindrical battery and the corresponding side length of a square battery. Figure 3 As shown, the internal gasket 14 is used to seal the gap between the explosion-proof valve plate 12 and the outer periphery of the orifice plate 13, that is, to ensure that the explosion-proof valve plate 2 and the edge of the orifice plate 3 are sealed. In addition, the electrical connection described in the present invention refers to a conductive connection between two components, and needs to have a certain connection strength, such as welding or bonding with a conductive adhesive, etc., which is not limited here. As a preferred embodiment, welding connection is used.

[0083] To achieve better sealing effect, such as Figure 3 , Figure 4 As shown, as a preferred embodiment, the internal gasket 14 includes an internal gasket bottom 141 and an internal gasket side wall 142, the internal gasket bottom 141 is a circular ring structure, and the top of the internal gasket side wall 142 is pressed against the lower surface of the top cover 11. The internal gasket 14 can accommodate the explosion-proof valve plate 12. As a preferred embodiment, the height of the internal gasket side wall 142 is slightly greater than the thickness of the explosion-proof valve plate 12, that is, the internal gasket side wall 142 will have a certain extrusion force on the top cover 11 to improve the sealing between the explosion-proof valve plate 12 and the top cover 11. The inner diameter of the internal gasket side wall 142 is slightly smaller than the diameter of the explosion-proof valve plate 12, that is, the internal gasket side wall 142 has an extrusion force on the explosion-proof valve plate 12 to effectively fix the explosion-proof valve plate 12 and improve its sealing.

[0084] Please continue to refer to Figure 1-Figure 3 In one embodiment, the outer shell 2 of the present invention omits the rolling groove structure, and seals the gap between the cap 1 and the outer shell 2 through the external gasket 6, and fixes the winding core 3 at the same time, which can meet the requirements of fixing the winding core and sealing the battery. There is no specific limitation on the structure of the external gasket 6, as long as it can meet the above requirements. As a preferred embodiment of the present invention, please refer to Figure 3 and Figure 4, the external gasket 6 comprises: an external gasket top 61, the external gasket top 61 is a circular ring structure, the cap 1 is exposed from the middle circular notch (that is, the middle circular notch is used to place the top cover 11 of the cap 1); an external gasket bottom 63, which is arranged between the cap 1 and the shell 2. As a preferred embodiment, the external gasket bottom 63 is provided with a chamfer inclined toward the inside of the gasket, which is used to press the outer periphery of the top of the winding core 3 and / or the orifice plate 13. In addition, the external gasket 6 also includes an external gasket side wall 62, which is used to connect the external gasket top 61 and the external gasket bottom 63.

[0085] like Figure 3 and Figure 4 As shown, the present invention does not impose any specific limitation on the size of the circular notch on the top 61 of the external gasket, as long as it can accommodate the top cover 11 and does not affect the exhaust of the battery under high pressure. Regarding the chamfered corner inclined toward the inside of the gasket provided at the bottom 63 of the external gasket, by adjusting the sizes of the core 3, the orifice plate 13 and the chamfered corner, the fixation of the core 3 and the sealing of the outer shell 2 can be achieved in the following three ways: a. The chamfer presses against the outer periphery of the top of the core 3, that is, the chamfer is inserted downward to seal the gap between the outer periphery of the top of the core 3 and the outer shell 2; b. The chamfer presses against the outer periphery of the top of the orifice plate 13, that is, the chamfer is inserted downward to seal the gap between the outer periphery of the top of the orifice plate 13 and the outer shell 2, and the core 3 is pressed downward to fix the core 3; c. The chamfer presses against the outer periphery of the top of the core 3 and the orifice plate 13 at the same time, that is, the chamfer is inserted downward to seal the gap between the outer periphery of the top of the core 3 and the orifice plate 13 and the outer shell 2, and the core 3 is double fixed by pressing downward on the core 3 and the orifice plate 13 at the same time. By pressing against the inclined chamfer of the bottom 63 of the external gasket, on the one hand, the core 3 is fixed to prevent it from shaking in the outer shell; on the other hand, the inclined chamfer can achieve a sealing effect on the gap between the top periphery of the core 3 and / or the orifice plate 13 and the outer shell 2; at the same time, the core 3 and / or the orifice plate 13 exert an upward force on the external gasket 6 to achieve a sealing effect between the top 61 of the external gasket and the top of the outer shell 2, as well as a sealing effect between the side wall 62 of the external gasket and the side wall of the outer shell 2.

[0086] In order to make the outer gasket bottom 63 have better supporting strength and sealing effect, and when the outer gasket side wall 62 is subjected to the upward force of the winding core 3 and / or the orifice plate 13, it can press the outer shell 2 side wall to achieve better sealing effect, as a preferred embodiment, as shown in Figure 3As shown, the cross section of the outer gasket side wall 62 is a triangular structure, that is, a solid reinforcement inclined surface is provided on the inner side of the outer gasket top 61 and the outer gasket bottom 63, and the angle of the inclined surface is not specifically limited as long as the above-mentioned effect can be achieved. In addition, in order to further increase the support strength and sealing effect, as a preferred embodiment, the outer diameter of the upper part of the outer gasket 6 is smaller than the outer diameter of the lower part, and the outer surface of the upper part of the outer gasket 6 is connected to the outer surface of the lower part through an inclined surface 65.

[0087] To achieve better sealing effect, such as Figure 4 As shown, in a preferred embodiment, the outer periphery of the top cover 11 is provided with a circle of upward flange 111, and the top of the flange 111 is pressed against the lower surface of the top 61 of the external gasket. The thickness and height of the flange 111 are not specifically limited in the present invention, as long as the above-mentioned sealing effect can be achieved. In one embodiment, the top of the outer shell 2 is bent inward to press the external gasket 6 tightly against the top of the flange 111 and the upper surface of the top cover 11 near the flange 111. Such a design allows the top 61 of the external gasket to have a larger contact area with the top cover 11 to achieve a better sealing effect.

[0088] To cooperate with the use of the flange 111, as Figure 4 As shown, as a preferred embodiment, the lower surface of the top 61 of the external gasket is provided with a circumference of a downward protrusion 64, and the protrusion 64 is located on the inner side of the flange 111. Preferably, the position of the protrusion 64 coincides with the flange 111. On the one hand, the protrusion 64 has a limiting effect on the flange 111 and further has a limiting effect on the top cover 11, and on the other hand, cooperates with the flange 111 to play a further sealing role. In one embodiment, the top of the housing 2 is bent inward to press the protrusion 64 against the side wall of the flange 111 to achieve a better sealing effect.

[0089] Please continue to refer to Figure 3 As a preferred embodiment, after the outer shell 2 is bent, the outer gasket 6 has a portion extending out of the outer shell 2, that is, the diameter of the middle circular notch of the top 61 of the outer gasket is smaller than the diameter of the circular notch formed after the top of the outer shell 2 is bent inwardly. The extended portion does not need to be very long, and it only needs to extend slightly out of the outer shell 2.

[0090] The structure that the orifice plate 13 and the explosion-proof valve plate 12 are electrically connected at the center and separated at the periphery with a gap is not specifically limited, as long as the above functions can be met. For example, the explosion-proof valve plate 12 can adopt a structure that is generally concave downward in the prior art.

[0091] In order to achieve a better explosion-proof effect, as a preferred embodiment, Figure 3 and Figure 4 As shown, an upward groove 121 with an opening facing upward is provided at the center of the explosion-proof valve plate 12; a downward groove 131 with an opening facing downward is provided at the center of the orifice plate 13; the downward groove 131 is electrically connected to the upward groove 121 (i.e., constitutes a current cut-off device CID); the upward groove 121 or the downward groove 131 has a boss structure 122, so that a gap is left between the explosion-proof valve plate 12 and the orifice plate 13 (the gap is used for the gas generated when an abnormality occurs in the battery to enter to open the CID, and is separated by an internal gasket 14 to prevent further contact between the two after the CID is disconnected, thereby failing to cut off the current).

[0092] Please continue to refer to Figure 3-6 The boss structure 122 is used to leave a gap between the explosion-proof valve plate 12 and the orifice plate 13, and the gap is used for the gas generated when the battery is abnormal to enter to open the CID. Those skilled in the art can understand that as a preferred embodiment, the boss structure 122 can be formed by the bottom of the upward groove 121, and the boss structure 122 protrudes from the lower surface of the explosion-proof valve plate 12 (refer to Figure 4 ); correspondingly, the downward groove 131 is a pit-shaped structure (preferably a cylindrical groove) formed at the center of the orifice plate 13, and the upper surface of the orifice plate 13 is the same plane (reference Figure 5 , Figure 6 As another preferred embodiment, which is not shown in the figure but can be understood by those skilled in the art, the boss structure can be formed by the top of the downward groove 131, and the boss structure protrudes from the upper surface of the orifice plate 13; correspondingly, the upward groove 121 is a pit-shaped structure (preferably a cylindrical groove) formed at the center of the explosion-proof valve plate 12, and the lower surface of the explosion-proof valve plate 12 is the same plane.

[0093] As a preferred embodiment, the thickness of the inner gasket bottom 141 is slightly greater than the height of the boss structure 122 , that is, the explosion-proof valve plate 12 and the orifice plate 13 exert a certain squeezing force on the inner gasket bottom 141 to improve the sealing of the periphery between the explosion-proof valve plate 12 and the orifice plate 13 .

[0094] Through the above design, while ensuring the sealing performance of the battery, the structure composed of the top cover 11, the explosion-proof valve plate 12, the orifice plate 13 and the internal gasket 14 is made more compact, reducing the space occupied.

[0095] As a further preferred embodiment, the downward groove 131 is connected to the upward groove 121 by welding, such as spot welding, to achieve a certain connection strength and good conductivity. The connection strength needs to be sufficient to separate the two when a certain amount of gas is generated during abnormal use of the battery, that is, the CID is turned on to disconnect the battery.

[0096] In addition, in order to better realize the overturning of the explosion-proof valve plate 12 under a certain air pressure, as a preferred embodiment, Figure 4 As shown, a circle of explosion-proof grooves 123 are provided on the upper surface of the explosion-proof valve plate 12. The depth and other dimensions of the explosion-proof grooves 123 need to be satisfied. When a certain amount of gas is generated due to abnormal use of the battery, the explosion-proof valve plate 12 can be turned over, or even the explosion-proof grooves 123 can be cracked to discharge the gas, so as to prevent the battery from exploding.

[0097] As a further preferred embodiment, Figure 6 As shown, a peripheral hole plate explosion-proof groove 132 is provided at the bottom of the downward groove 131 . When a certain amount of gas is generated due to abnormal use of the battery, the downward groove 131 can be depressed downward to better separate the downward groove 131 from the upward groove 121 .

[0098] Please continue to refer to Figure 3-4 The top cover 11 of the present invention is provided with a vent hole for pressure relief, which is a conventional structure in the art, and the present invention does not specifically limit its structure. Due to the special design of the explosion-proof valve plate 12 structure of the present invention, the explosion-proof valve plate 12 can occupy less space when flipped upward, thereby reducing the height of the top cover 11. In addition, in order to ensure a certain degree of sealing between the explosion-proof valve plate 12 and the top cover 11, the two are connected by wire welding 112, and the wire welding 112 surrounds the center of the explosion-proof valve plate 12 and the top cover 11. The wire welding 112 can be continuous or segmented, preferably continuous.

[0099] In order to partially solve the problems in the prior art such as the complex structure of the positive busbar, the folded and extended part occupying the internal space of the battery, and the small welding area, another aspect of the present invention provides a structure of the positive busbar. Figure 2 and Figure 7 As shown, in one embodiment, the non-grooved battery of the present invention further includes a positive busbar 4, the positive busbar 4 includes a winding core connection portion 41 connected to the winding core 3, and a cap connection portion 42 connected to the cap 1, and the cap connection portion 42 is located at the periphery of the winding core connection portion 41. The connection between the cap connection portion 42 and the cap 1 is specifically connected to the orifice plate 13 of the cap 1.

[0100] In this embodiment, in order to achieve the fixation and electrical connection between the orifice plate 13 and the positive busbar 4 (cap connection portion 42), the orifice plate 13 and the positive busbar 4 (cap connection portion 42) are connected by wire welding 133 (such as Figure 5 shown).

[0101] In order to achieve a more reliable welding between the orifice plate 13 and the positive busbar 4 (cap connection portion 42), as a preferred embodiment, as shown in FIG. Figure 8 As shown, the cap connection portion 42 is annular. The size of the annular cap connection portion 42 is not specifically limited, as long as the above-mentioned effect can be achieved.

[0102] As a further preferred embodiment, Fig. 9 As shown, the annular cap connection portion 42 is provided with a convex ridge 421. In this embodiment, the orifice plate 13 is connected to the positive busbar 4 (cap connection portion 42) by welding, and the welding track 133 (as shown in FIG. Figure 5 The orifice plate 13 and the positive electrode busbar 4 are connected to each other in a more reliable manner.

[0103] According to another aspect of the present invention, as a non-limiting embodiment, the present invention provides a method for preparing a non-grooved battery, comprising the following steps:

[0104] Step 1, accommodating the winding core 3 in the housing 2, and connecting and fixing the positive electrode busbar 4 to the winding core 3 by welding;

[0105] Step 2, placing the orifice plate 13 on top of the positive electrode busbar 4, and connecting and fixing the orifice plate 13 and the positive electrode busbar 4 by welding;

[0106] Step 3, placing the explosion-proof valve plate 12 in the internal gasket 14, and placing the internal gasket 14 on the top of the orifice plate 13, and connecting and fixing the upward groove 121 of the explosion-proof valve plate 12 and the downward groove 131 of the orifice plate 13 by welding;

[0107] Step 4, placing the top cover 11 on the top of the explosion-proof valve plate 12, and connecting and fixing the top cover 11 to the explosion-proof valve plate 12 by welding;

[0108] Step 5, the external gasket 6 is buckled onto the top cover 11, so that the lower surface of the top 61 of the external gasket is pressed against the flange 111 of the top cover 11, and the bottom 63 of the external gasket is pressed against the outer periphery of the top of the winding core 3 and / or the orifice plate 13;

[0109] Step 6, stamping and bending the top of the outer shell 2 inwardly to cover the top 61 of the outer gasket and exert a downward force on it, thereby achieving sealing between the cap 1 and the outer shell 2.

[0110] As another non-limiting embodiment, the present invention provides a method for preparing a non-grooved battery, comprising the following steps:

[0111] Step 1, assembling the top cover 11, the explosion-proof valve plate 12, the internal gasket 14, and the orifice plate 13 to form a cap 1;

[0112] Step 2, accommodating the winding core 3 in the housing 2, and connecting and fixing the positive electrode busbar 4 to the winding core 3 by welding;

[0113] Step 3, placing the orifice plate 13 of the cap 1 on the top of the positive busbar 4, and connecting and fixing the orifice plate 13 to the positive busbar 4 by welding;

[0114] Step 4: Put the external gasket 6 on the top cover 11, so that the lower surface of the top 61 of the external gasket is pressed against the flange 111 of the top cover 11, and the bottom 63 of the external gasket is pressed against the outer periphery of the top of the winding core 3 and / or the orifice plate 13;

[0115] Step 5: Punch the top of the outer shell 2 and bend it inward to cover the top 61 of the outer gasket and exert a downward force on it, thereby achieving sealing between the cap 1 and the outer shell 2.

[0116] The above description of various embodiments of the present invention is provided to one of ordinary skill in the relevant art for the purpose of description. It is not intended that the present invention be exclusive or limited to a single disclosed embodiment. As above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A battery, characterized in that: include: A cap (1), an external gasket (6), a housing (2) and a winding core (3); The winding core (3) is contained in the housing (2), and the cap (1) is electrically connected to the winding core (3); The top of the outer shell (2) is bent inwards to press the outer gasket (6) tightly against the cap (1), thereby fixing the winding core (3) in the outer shell (2); The housing (2) does not have a rolling groove structure.

2. The battery according to claim 1, characterized in that The external gasket (6) comprises: An external gasket top (61), the external gasket top (61) is a circular ring structure, and the cap (1) is exposed from a central circular notch; The outer gasket bottom (63) is arranged between the cap (1) and the outer shell (2).

3. The battery according to claim 1, characterized in that The cap (1) comprises: Top cover (11); an explosion-proof valve plate (12), the explosion-proof valve plate (12) being arranged below the top cover (11) and being electrically connected to the top cover (11); An orifice plate (13), the orifice plate (13) being arranged below the explosion-proof valve plate (12); the orifice plate (13) and the explosion-proof valve plate (12) being electrically connected at the center and separated from each other with a gap at the peripheral position; An internal gasket (14), the internal gasket (14) is used to seal the gap between the explosion-proof valve plate (12) and the outer periphery of the orifice plate (13).

4. The battery according to claim 3, characterized in that The outer circumference sizes of the orifice plate (13), the top cover (11) and the explosion-proof valve plate (12) decrease in sequence.

5. The battery according to claim 3, characterized in that The internal gasket (14) comprises an internal gasket bottom (141) and an internal gasket side wall (142); the internal gasket bottom (141) is a circular ring structure, and the top of the internal gasket side wall (142) is pressed against the lower surface of the top cover (11).

6. The battery according to claim 5, characterized in that The height of the inner gasket side wall (142) is slightly greater than the thickness of the explosion-proof valve plate (12), and the inner diameter of the inner gasket side wall (142) is slightly smaller than the diameter of the explosion-proof valve plate (12).

7. The battery according to claim 2, characterized in that The external gasket (6) further comprises an external gasket side wall (62), wherein the external gasket side wall (62) is used to connect the external gasket top (61) and the external gasket bottom (63).

8. The battery according to claim 3, characterized in that The outer periphery of the top cover (11) is provided with a circle of upward flange (111), and the top of the flange (111) is pressed against the lower surface of the top (61) of the external gasket.

9. The battery according to claim 8, characterized in that The top of the outer shell (2) is bent inwards to press the external gasket (6) tightly against the top of the flange (111) and the upper surface of the top cover (11) near the flange (111).

10. The battery according to claim 8, characterized in that A circumferential downward protrusion (64) is provided on the lower surface of the top (61) of the external gasket, and the protrusion (64) is located on the inner side of the flange (111).

11. The battery according to claim 10, characterized in that The top of the housing (2) is bent inwards to press the protrusion (64) tightly against the side wall of the flange (111).

12. The battery according to claim 1, characterized in that The outer diameter of the upper portion of the external gasket (6) is smaller than the outer diameter of the lower portion thereof, and the outer surface of the upper portion of the external gasket (6) is connected to the outer surface of the lower portion thereof via an inclined surface (65).

13. The battery according to claim 9 or 11, characterized in that: After the outer shell (2) is bent, a portion of the outer gasket (6) protrudes from the outer shell (2).

14. The battery according to claim 3, characterized in that An upward groove (121) is provided at the center of the explosion-proof valve plate (12), and a downward groove (131) is provided at the center of the orifice plate (13); the downward groove (131) is connected to the upward groove (121) by welding; and the upward groove (121) or the downward groove (131) has a boss structure (122).

15. The battery according to claim 13, characterized in that The thickness of the bottom (141) of the inner gasket is slightly greater than the height of the boss structure (122).

16. The battery according to claim 3, characterized in that The upper surface of the explosion-proof valve plate (12) is provided with an explosion-proof groove (123) around it.

17. The battery according to claim 3, characterized in that The explosion-proof valve plate (12) is connected to the top cover (1) via wire welding (112), and the wire welding (112) is continuous or segmented.

18. The battery according to claim 1, characterized in that It also includes a positive busbar (4), which includes a winding core connection portion connected to the winding core (3) and a cap connection portion connected to the cap (1), and the cap connection portion is located at the periphery of the winding core connection portion.

19. The battery according to claim 17, characterized in that The cap connection portion is provided with a peripheral ridge (421).

20. The battery according to claim 18, characterized in that The orifice plate (13) is connected to the ridge (421) by welding, and the welding track is located on the ridge (421).

21. The battery according to claim 17, characterized in that The orifice plate (13) is connected to the cap connection portion of the positive electrode busbar (4) by welding.

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