Cap structure based on sawtooth current cutoff structure and battery

Abstract

The application provides a cap structure based on a sawtooth current cut-off structure and a battery. The cap structure based on the sawtooth current cut-off structure comprises a current cut-off structure and an explosion-proof valve connected to each other, the current cut-off structure comprises a current cut-off piece and a sawtooth edge connected to the outer periphery of the current cut-off piece, and the current cut-off piece is fixedly connected to one side of the explosion-proof valve; the cap structure further comprises an insulating ring connected to the outer periphery of the sawtooth edge; a deformation buffer zone is formed at the position where the sawtooth edge is connected to the insulating ring, and the deformation buffer zone is provided with at least two first pressure relief holes. When the cap structure is subjected to a transverse pressure, the current cut-off structure is deformed and buffered by the insulating ring, at the same time, the gas pressure in the battery is relieved through the first pressure relief holes of the sawtooth edge, and the problem that the current cut-off structure and the insulating ring are easily separated can be avoided, so that the internal positive and negative electrode short circuit problem can be better prevented, and the use reliability of the cap structure is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cap structure and battery based on a sawtooth current cutting structure. Background Technology

[0002] The end cap structure includes a current-cutting structure, an insulating ring, an explosion-proof valve, a cover plate, and plastic parts. The insulating ring surrounds the periphery of the current-cutting structure, which is welded to one side of the explosion-proof valve. The other side of the explosion-proof valve covers the periphery of the cover plate, and the plastic parts cover the periphery where the explosion-proof valve connects to the cover plate. The current-cutting structure, welded to the tab, functions as a circuit breaker. When the internal pressure of the battery rises to a predetermined value, the current-cutting structure deforms to cut off the current circuit. When the internal pressure of the battery rises further, the current-cutting structure breaks down, releasing the internal pressure of the battery, preventing an explosion, and separating from the explosion-proof valve when the internal pressure reaches a threshold. Simultaneously, the explosion-proof valve deforms away from the current-cutting structure or even cracks, allowing the internal pressure of the battery to be released. When the explosion-proof valve cracks, the internal pressure of the battery is released sequentially through the vents of the explosion-proof valve and the cover plate.

[0003] The end cap structure is prone to deformation under lateral pressure during assembly. The current cutting structure is subject to large deformation under lateral pressure, which makes it easy for the current cutting structure to detach from the insulating ring, thus resulting in poor reliability of the end cap structure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cap structure and battery with a small residual thickness for pressure resistance based on a sawtooth current cutting structure.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A cap structure based on a sawtooth current cutting structure includes a current cutting structure and an explosion-proof valve connected together. The current cutting structure includes a current cutting plate and a sawtooth edge connected to the outer periphery of the current cutting plate. The current cutting plate is fixedly connected to one side of the explosion-proof valve. The cap structure also includes an insulating ring connected to the outer periphery of the sawtooth edge.

[0007] A deformation buffer zone is formed at the location where the serrated edge connects to the insulating ring, and the deformation buffer zone has a first pressure relief hole; the total area of ​​all the first pressure relief holes on the serrated edge is S. 孔 The area enclosed by the outer periphery contour line of the current interruption structure on the serrated edge is S. 总 The area ratio of the first pressure relief hole is S. 孔 / S 总S 孔 / S 总 It ranges from 0.01% to 25%.

[0008] In one embodiment, the number of the first pressure relief holes is n, where n is an integer greater than 2 and less than or equal to 50.

[0009] In one embodiment, each of the first pressure relief holes is a semi-circular hole, a semi-elliptical hole, a triangular hole, a quadrilateral hole, or a sawtooth hole.

[0010] In one embodiment, the first pressure relief holes of the deformable buffer are spaced apart.

[0011] In one embodiment, the area of ​​all the first pressure relief holes on the serrated edge is S. 孔 The area enclosed by the outer periphery contour line of the current interruption structure on the serrated edge is S. 总 The area ratio of the first pressure relief hole is S. 孔 / S 总 S 孔 / S 总 It ranges from 0.01% to 25%.

[0012] In one embodiment, S 孔 / S 总 It ranges from 2% to 5%.

[0013] In one embodiment, the current cut-off piece is welded to the explosion-proof valve.

[0014] In one embodiment, a second pressure relief hole is provided at the location where the current cut-off piece is welded to the explosion-proof valve.

[0015] In one embodiment, the deformation buffer is in the shape of a ring.

[0016] A battery comprising a cap structure based on a sawtooth current cutting structure as described in any of the above embodiments.

[0017] In one embodiment, the battery is a cylindrical battery.

[0018] Compared with the prior art, the present invention has at least the following advantages:

[0019] The aforementioned cap structure based on the sawtooth current cutting structure has a deformation buffer zone formed at the location where the sawtooth edge is connected to the outer periphery of the current cutting piece and the insulating ring is connected to the outer periphery of the sawtooth edge. When the cap structure is subjected to lateral pressure, the current cutting structure buffers the deformation buffer zone through the insulating ring. At the same time, the gas pressure inside the battery is released through the first pressure relief hole on the sawtooth edge. This also avoids the problem of the current cutting structure and the insulating ring easily falling off and separating, thus better preventing the problem of internal positive and negative short circuits and improving the reliability of the cap structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a cap structure based on a sawtooth current cutting structure according to one embodiment;

[0022] Figure 2 for Figure 1 A schematic diagram of another perspective of the cap structure based on the sawtooth current cutting structure;

[0023] Figure 3 for Figure 2 The diagram shows a sectional view along line AA of the cap structure based on the sawtooth current cutting structure.

[0024] Figure 4 for Figure 2 The figure shows a BB-line cross-sectional view of the cap structure based on the sawtooth current cutting structure.

[0025] Figure 4a for Figure 2 The diagram shows a current-cutting structure based on a cap structure with a sawtooth current-cutting structure.

[0026] Figure 5 This is a BB-line cross-sectional view of a cap structure based on a sawtooth current cutting structure according to another embodiment;

[0027] Figure 6 for Figure 1 The flowchart shown is a manufacturing process for a cap structure based on a sawtooth current cutting structure.

[0028] Figure 7 for Figure 1 Another flowchart of the manufacturing process of the cap structure based on the sawtooth current cutting structure is shown. Detailed Implementation

[0029] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] This application provides a cap structure based on a sawtooth current cutting structure, including a current cutting structure and an explosion-proof valve connected together. The current cutting structure includes a current cutting plate and a sawtooth edge connected to the outer periphery of the current cutting plate. The current cutting plate is fixedly connected to one side of the explosion-proof valve. The cap structure also includes an insulating ring connected to the outer periphery of the sawtooth edge. A deformation buffer is formed at the location where the sawtooth edge connects to the insulating ring. The deformation buffer has at least two first pressure relief holes.

[0033] The aforementioned cap structure based on the sawtooth current cutting structure has a deformation buffer zone formed at the location where the sawtooth edge is connected to the outer periphery of the current cutting piece and the insulating ring is connected to the outer periphery of the sawtooth edge. When the cap structure is subjected to lateral pressure, the current cutting structure buffers the deformation buffer zone through the insulating ring. At the same time, the gas pressure inside the battery is released through the first pressure relief hole on the sawtooth edge, which can avoid the problem of the current cutting structure and the insulating ring easily falling off and separating, so as to better prevent the problem of internal positive and negative short circuit and improve the reliability of the cap structure.

[0034] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments:

[0035] like Figures 1 to 3 As shown, a cap structure 100 based on a serrated current cutting structure in one embodiment includes a current cutting structure 110 and an explosion-proof valve 120 connected together. The current cutting structure 110 includes a current cutting plate 112 and a serrated edge 114 connected to the outer periphery of the current cutting plate 112. The current cutting plate 112 is fixedly connected to one side of the explosion-proof valve 120. See also... Figure 4 and Figure 4a Furthermore, the cap structure 100 also includes an insulating ring 130, which is connected to the outer periphery of the serrated edge 114, that is, the insulating ring 130 is fixed around the outer periphery of the serrated edge 114.

[0036] In one embodiment, a deformation buffer zone 1142 is formed at the location where the serrated edge 114 connects to the insulating ring 130. The deformation buffer zone 1142 has at least two first pressure relief holes 1143. When the cap structure 100 is subjected to lateral pressure, the insulating ring 130 is deformed first. The deformation buffer zone 1142 is buffered by the deformation pressure of the insulating ring 130, that is, the deformation of the deformation buffer zone 1142 under pressure is small. In addition, the first pressure relief holes 1143 of the deformation buffer zone 1142 release pressure, avoiding the problem of the current cutting structure 110 and the insulating ring 130 easily falling off and separating, so as to better prevent the problem of internal positive and negative short circuits and improve the reliability of the cap structure.

[0037] The aforementioned cap structure 100 based on the sawtooth current cutting structure has a deformation buffer zone 1142 formed at the location where the sawtooth edge 114 is connected to the outer periphery of the current cutting piece 112, and the insulating ring 130 is connected to the outer periphery of the sawtooth edge 114. When the cap structure 100 is subjected to lateral pressure, the current cutting structure 110 buffers the deformation buffer zone 1142 through the insulating ring 130. At the same time, the gas pressure inside the battery is released through the first pressure relief hole 1143 of the sawtooth edge 114. This not only reduces the deformation of the current cutting structure 110 caused by lateral pressure, but also effectively releases pressure through the first pressure relief hole 1143, avoiding the problem of the current cutting structure 110 and the insulating ring 130 easily falling off and separating, thus better preventing the problem of internal positive and negative short circuits and improving the reliability of the cap structure.

[0038] like Figures 1 to 3As shown, the cap structure 100 further includes a cover plate 140 and a plastic part 150. One side of the explosion-proof valve 120 is connected to the outer periphery of the cover plate 140, and the other side of the explosion-proof valve 120 is connected to the current cut-off structure 110. The cover plate 140 has a vent 141, and the side of the cover plate 140 adjacent to the explosion-proof valve 120, together with the explosion-proof valve 120, forms a deformation chamber 142 communicating with the vent. The plastic part 150 is glued to the outer periphery of the explosion-proof valve 120 and the periphery of the cover plate 140, respectively, so that the inner peripheral wall of the plastic part 150 is sealed to the explosion-proof valve 120 and the cover plate 140. A pressure relief gap 102 is formed between the current cut-off structure 110 and the explosion-proof valve 120. The pressure relief gap 102 communicates with each first pressure relief hole 1143, allowing the battery pressure to be released into the pressure relief gap 102 through each pressure relief hole.

[0039] like Figures 1 to 3 As shown, in one embodiment, the current cut-off piece 112 is welded to the explosion-proof valve 120, so that the current cut-off piece 112 is connected to the explosion-proof valve 120. In this embodiment, when the battery pressure reaches a first threshold, the pressure in the pressure relief gap 102 reaches a preset value, causing the explosion-proof valve 120 to deform toward the deformation chamber 142; when the battery pressure reaches a second threshold, the explosion-proof valve 120 deforms toward the deformation chamber 142, and the weld between the explosion-proof valve 120 and the current cut-off structure 110 breaks and separates, so as to relieve the pressure of the battery.

[0040] like Figure 3 As shown, in one embodiment, the explosion-proof valve 120 includes an explosion-proof valve body 120a and a folded edge portion 120b extending outward from the explosion-proof valve body. The explosion-proof valve body 120a abuts against the bottom of the cover plate 140, and the folded edge portion 120b covers the outer periphery and top of the cover plate 140, respectively, so that the explosion-proof valve 120 is reliably connected to the outer periphery of the cover plate 140. The explosion-proof valve body 120a is welded to the current cut-off piece 112. Further, the cap structure 100 also includes a PTC (Positive Temperature Coefficient thermistor) (not shown). The PTC is disposed between the explosion-proof valve body 120a and the cover plate 140, and the PTC abuts against both the explosion-proof valve body 120a and the cover plate 140. When the resistance increases suddenly, the PTC cuts off the current, which can play a role in temperature protection.

[0041] like Figures 1 to 3As shown, in one embodiment, a second pressure relief hole 1122 is provided at the location where the current cut-off piece 112 is welded to the explosion-proof valve 120. When the current cut-off structure 110 breaks and separates from the explosion-proof valve 120, the battery pressure can be quickly discharged simultaneously through the first pressure relief hole 1143 and the second pressure relief hole 1122, improving the pressure relief rate of the battery and thus improving the battery's safety performance. In this embodiment, there are two second pressure relief holes 1122. Since there are at least two first pressure relief holes 1143, the pressure relief rate and safety performance of the battery are improved compared to the traditional cap structure.

[0042] When a battery malfunctions, such as a short circuit, the internal pressure changes abruptly. When the internal pressure reaches a first threshold, the pressure in the pressure relief gap 102 reaches a preset value, causing the explosion-proof valve 120 to deform towards the deformation chamber 142. When the internal pressure reaches a second threshold, the explosion-proof valve 120 continues to deform towards the deformation chamber 142, and the explosion-proof valve 120 breaks and separates from the current cutoff structure 110. When the internal pressure reaches a third threshold, the explosion-proof valve 120 continues to deform towards the deformation chamber 142, and the explosion-proof groove 125 of the explosion-proof valve 120 cracks, allowing the internal pressure of the battery to be discharged through the explosion-proof groove 125, the deformation chamber 142, and the vent, thus reliably relieving the battery pressure. In this embodiment, the second threshold is greater than the first threshold and less than the third threshold.

[0043] In a conventional cap structure 100, the explosion-proof valve 120 and the sealing ring are all located on a plastic part. The sealing ring is respectively fitted onto the explosion-proof valve 120 and the current cut-off structure 110, and three flow holes are formed on the inner peripheral wall of the sealing ring. To better illustrate that the cap structure 100 of this application is superior to the conventional cap structure 100, some specific embodiments are listed below. It should be noted that the following embodiments do not exhaust all possible situations, and the materials used in the following embodiments are commercially available unless otherwise specified. Specifically, the conventional cap structure 100 is tested with different lateral pressures F to measure the percentage of short circuits caused by the current cut-off structure 110 detaching.

[0044] In one embodiment, the number of first pressure relief holes 1143 of the current cut-off structure 110 of the cap structure 100 is 18. The lateral pressure F is 13KN, and the number of tests is set to 10, 30 and 60 respectively. The percentage of short circuits caused by the current cut-off structure 110 falling off in the cap structure 100 is shown in Table 1 below.

[0045]

[0046] According to the data in Table 1 above, under the same lateral pressure conditions, the current-cutting structure 110 of the traditional cap structure 100 exhibits a 0% or higher rate of detachment and short circuit under different test numbers compared to the cap structure 100 of this application. Therefore, the cap structure 100 of this application can avoid the problem of easy detachment and separation between the current-cutting structure 110 and the insulating ring 130, thus better preventing internal positive and negative short circuits and improving the reliability of the cap structure.

[0047] In another embodiment, the number of first pressure relief holes 1143 of the current cutting-off structure 110 of the cap structure 100 is 18. The lateral pressure F is 13.79KN. The number of tests is set to 20 and 50 respectively, and the percentage of short circuits caused by the current cutting-off structure 110 of the cap structure 100 falling off is shown in Table 2 below.

[0048]

[0049] According to the data in Table 2 above, under the same lateral pressure conditions, the current-cutting structure 110 of the conventional cap structure 100 exhibits a 0% or higher rate of detachment and short circuit under different test numbers compared to the conventional cap structure 100. Therefore, the cap structure 100 of this application can avoid the problem of easy detachment and separation between the current-cutting structure 110 and the insulating ring 130, thus better preventing internal positive and negative short circuits and improving the reliability of the cap structure.

[0050] like Figures 1 to 3 As shown, it can be understood that in other embodiments, the number of first pressure relief holes 1143 is not limited to two. In one embodiment, the number of first pressure relief holes 1143 is n, where n is an integer greater than 2 and less than or equal to 50.

[0051] like Figures 1 to 3 As shown, in one embodiment, each first pressure relief hole 1143 is a semi-circular hole, a semi-elliptical hole, a triangular hole, a quadrilateral hole, or a serrated hole. For example, each first pressure relief hole 1143 is a quadrilateral hole. Specifically, each first pressure relief hole 1143 is a rectangular hole, a square hole, or a trapezoidal hole.

[0052] like Figures 1 to 3As shown, in this embodiment, each first pressure relief hole 1143 is a serrated hole. Further, the serration depth of each first pressure relief hole 1143 is 0.05mm to 3mm. In this embodiment, the serration depth of each first pressure relief hole 1143 is 0.1mm to 1mm, giving each first pressure relief hole 1143 a better pressure relief effect, while also ensuring that the insulating ring 130 is well connected to the deformation buffer zone 1142. In this embodiment, each first pressure relief hole 1143 is located at the edge of the deformation buffer zone 1142, making the processing difficulty of each first pressure relief hole 1143 lower.

[0053] like Figures 1 to 3 As shown, in one embodiment, the first pressure relief holes 1143 of the deformation buffer 1142 are spaced apart, so that the deformation force generated by the pressure at each position of the deformation buffer 1142 is small, thereby giving the deformation buffer 1142 a better buffering effect.

[0054] like Figures 1 to 3 As shown, in one embodiment, the total area of ​​all the first pressure relief holes 1143 on the serrated edge 114 is S. 孔 That is, the sum of the areas of all the first pressure relief holes 1143 on the sawtooth edge 114 is S. 孔 For example, if there are two first pressure relief holes 1143, then the sum of the areas of the two first pressure relief holes 1143 is S. 孔 .

[0055] In one embodiment, the area enclosed by the outer peripheral contour of the serrated edge 114 of the current interruption structure 110 is S. 总 The area ratio of the first pressure relief hole 1143 is S. 孔 / S 总 S 孔 / S 总 The concentration is 0.01% to 25%, which gives the cap structure 100 a better pressure relief effect and avoids the problem of the current cutting-off structure 110 and the insulating ring 130 easily detaching and separating, thus better preventing internal positive and negative short circuits and improving the reliability of the cap structure. For example, S 孔 / S 总 It is 6.78%. In a preferred embodiment, S 孔 / S 总 It is 2% to 5%. Specifically, S 孔 / S 总 It is 3.97%.

[0056] Furthermore, the area of ​​each first pressure relief hole 1143 is 0.01 mm². 2 ~9mm 2 In this embodiment, the area of ​​each first pressure relief hole 1143 is 0.02 mm².2 ~1.5mm 2 This gives the cap structure 100 a better pressure relief effect, while also improving the compressive strength of the current cutting-off structure 110 and avoiding the problem of large buffer deformation in the deformation buffer zone.

[0057] like Figures 1 to 4 As shown, further, the insulating ring 130 covers the outer periphery of the serrated edge 114, making the insulating ring 130 tightly connected to the outer periphery of the serrated edge 114, thereby making the insulating ring 130 firmly connected to the outer periphery of the serrated edge 114. Further, the insulating ring 130 is heat-sealed to the outer periphery of the serrated edge 114, making the insulating ring 130 more firmly connected to the outer periphery of the serrated edge 114. In this embodiment, the insulating ring 130 is connected to the outer periphery of the serrated edge 114 through a heat-sealing process, making the insulating ring 130 tightly connected to the outer periphery of the serrated edge 114.

[0058] Of course, in other embodiments, the insulating ring 130 is not limited to covering the outer periphery of the serrated edge 114. For example... Figure 5 As shown, for example, the inner peripheral wall of the insulating ring 130 is provided with an annular groove 137, and the outer peripheral edge of the serrated edge 114 is located in the annular groove and is engaged with the insulating ring 130. This prevents the current cutting structure 110 from falling off and separating from the insulating ring 130 when the cap structure 100 is under pressure, and ensures that the current cutting structure 110 is reliably fixed in the cap structure 100 to prevent the problem of short circuit between the positive and negative terminals inside the battery.

[0059] like Figures 1 to 3 As shown, in one embodiment, the deformation buffer 1142 is annular in shape, providing a better buffering effect for the current cutting-off structure 110 during the pressure application process of the cap structure 100. In this embodiment, the insulating ring 130 covers the outer periphery of the deformation buffer 1142. The deformation buffer 1142 has an annular serrated structure, forming multiple first pressure relief holes 1143 adjacent to the outer periphery of the insulating ring 130.

[0060] Furthermore, the center of the current cut-off piece 112 is welded to the center of the side of the explosion-proof valve 120, making the stress on the pressure relief gap 102 more uniform. The pressure relief gap 102 is arranged around the center of the current cut-off piece 112. When the battery pressure reaches the second threshold, the explosion-proof valve 120 deforms towards the deformation chamber 142, and the weld between the explosion-proof valve 120 and the current cut-off structure 110 can be sensitively broken and separated, thus better relieving the battery pressure. In this embodiment, a deformation protrusion 123 protrudes from the center of the side of the explosion-proof valve 120 adjacent to the current cut-off structure 110. The deformation protrusion is welded to the current cut-off structure 110. When the battery pressure reaches the second threshold, the deformation protrusion breaks and separates from the weld between the current cut-off structure 110, allowing the battery pressure to be simultaneously relieved through the first pressure relief hole 1143 of the serrated edge 114 and the second pressure relief hole 1122 of the current cut-off piece 112.

[0061] like Figure 3 As shown, further, the explosion-proof valve 120 has an explosion-proof groove 125 near the deformation protrusion. When the pressure inside the battery reaches the third threshold, the explosion-proof valve 120 continues to deform toward the deformation chamber 142, and the explosion-proof groove 125 of the explosion-proof valve 120 cracks, so that the pressure inside the battery can be discharged through the explosion-proof groove 125, the deformation chamber 142 and the vent, thereby achieving reliable pressure relief of the battery.

[0062] like Figure 6 As shown, the manufacturing process of the cap structure 100 further includes some or all of the following steps:

[0063] S101, a current cutting structure 110 is stamped out, and a sawtooth edge 114 is formed on the outer periphery of the current cutting structure 110, and a deformation buffer 1142 is formed, wherein the deformation buffer 1142 is provided with at least two first pressure relief holes 1143.

[0064] S103, provides insulating ring 130;

[0065] S105, the current cutting off structure 110 is assembled onto the insulating ring 130, so that the insulating ring 130 covers and is connected to the current cutting off structure 110, and each first pressure relief hole 1143 is exposed outside the insulating ring 130, so that the current cutting off structure 110 and the insulating ring 130 are firmly connected.

[0066] S107, the explosion-proof valve 120 is stamped and covered onto the cover plate 140;

[0067] S109, the current cut-off structure 110 is welded to the explosion-proof valve 120;

[0068] S111, the plastic parts are glued to the outer periphery of the explosion-proof valve 120 and the periphery of the cover plate 140.

[0069] In this embodiment, an insulating ring 130 is disposed around the current interruption structure 110, and the insulating ring 130 is disposed around each first pressure relief hole 1143, with each first pressure relief hole 1143 exposed outside the insulating ring 130. Figure 7 As shown, further, after step S111 of adhesively bonding the plastic parts to the outer periphery of the explosion-proof valve 120 and the periphery of the cover plate 140, the manufacturing process of the cap structure 100 further includes:

[0070] S113, the plastic parts are fixedly connected to the outer periphery of the explosion-proof valve 120 and the periphery of the cover plate 140 through heat sealing process, so that the plastic parts are more firmly connected to the explosion-proof valve 120.

[0071] Furthermore, step S105, which involves assembling the current cutting structure 110 onto the insulating ring 130 and having the insulating ring 130 cover and connect to the current cutting structure 110, specifically involves: firstly, bonding and positioning the current cutting structure 110 onto the insulating ring 130, thereby pre-fixing and positioning the current cutting structure 110 and the insulating ring 130 before heat sealing, which improves the accuracy of the heat sealing assembly of the current cutting structure 110 and the insulating ring 130; then, heat sealing and fixing the current cutting structure 110 onto the insulating ring 130, so that the current cutting structure 110 is reliably connected to the insulating ring 130.

[0072] It is understood that in other embodiments, the step of assembling the current interruption structure 110 to the insulating ring 130 is not limited to the assembly method of bonding and heat sealing. For example, the step of assembling the current interruption structure 110 to the insulating ring 130 specifically involves: encapsulating the insulating ring 130 on the outer periphery of the current interruption structure 110, that is, injection molding the insulating ring 130 on the outer periphery of the current interruption structure 110, so that the insulating ring 130 is tightly connected to the current interruption structure 110, and at the same time, the current interruption structure 110 is reliably assembled to the insulating ring 130.

[0073] For example, the inner peripheral wall of the insulating ring 130 has an annular groove. The step of assembling the current cutting structure 110 into the insulating ring 130 includes: snapping the current cutting structure 110 into the annular groove, so that the current cutting structure 110 is interference-fitted into the insulating ring 130. Further, after snapping the current cutting structure 110 into the annular groove, the step of assembling the current cutting structure 110 into the insulating ring 130 also includes: applying adhesive to the annular groove to firmly snap the current cutting structure 110 into the annular groove, preventing the current cutting structure 110 from shaking or falling off relative to the insulating ring 130. Even further, the inner peripheral wall of the insulating ring 130 also has a positioning groove communicating with the annular groove. Thus, when applying adhesive to the annular groove, the adhesive can cure in the positioning groove, making the current cutting structure 110 more firmly snapped into the annular groove.

[0074] like Figures 1 to 3 As shown, this application also provides a battery (not shown), including a cap structure 100 based on a sawtooth current cutting structure according to any of the above embodiments. Further, the cap structure 100 includes a current cutting structure 110 and an explosion-proof valve 120 connected together. The current cutting structure 110 includes a current cutting piece 112 and a sawtooth edge 114 connected to the outer periphery of the current cutting piece 112, the current cutting piece 112 being fixedly connected to one side of the explosion-proof valve 120. Further, the cap structure 100 also includes an insulating ring 130, the insulating ring 130 being connected to the outer periphery of the sawtooth edge 114, that is, the insulating ring 130 is fixedly surrounding the outer periphery of the sawtooth edge 114. A deformation buffer zone 1142 is formed at the location where the serrated edge 114 connects to the insulating ring 130. When the cap structure 100 is subjected to lateral pressure, the insulating ring 130 is deformed first. The deformation buffer zone 1142 is buffered by the deformation pressure of the insulating ring 130, meaning the deformation of the deformation buffer zone 1142 under pressure is small. Combined with the venting and pressure relief function of the first pressure relief hole 1143 in the deformation buffer zone 1142, the problem of the current cutting-off structure 110 easily detaching from the insulating ring 130 is avoided, thus better preventing internal positive and negative short circuits and improving the reliability of the cap structure. In this embodiment, the deformation buffer zone 1142 has at least two first pressure relief holes 1143.

[0075] In the aforementioned battery, the serrated edge 114 is connected to the outer periphery of the current cutting piece 112, and the insulating ring 130 is connected to the outer periphery of the serrated edge 114. Furthermore, a deformation buffer zone 1142 is formed at the location where the serrated edge 114 is connected to the insulating ring 130. When the cap structure 100 is subjected to lateral pressure, the current cutting structure 110 buffers the deformation of the deformation buffer zone 1142 through the insulating ring 130. At the same time, the air pressure inside the battery is released through the first pressure relief hole 1143 of the serrated edge 114. This not only reduces the amount of deformation caused by the lateral pressure on the current cutting structure 110, but also effectively releases pressure through the first pressure relief hole 1143, avoiding the problem of the current cutting structure 110 and the insulating ring 130 easily falling off and separating. This better prevents the problem of internal positive and negative short circuits and improves the reliability of the cap structure.

[0076] In one embodiment, the battery is a cylindrical battery.

[0077] Furthermore, the battery also includes a winding core and a steel shell. The steel shell has a communicating opening slot and a core-holding cavity, with the winding core located within the core-holding cavity, thus housing the winding core within the steel shell. A cap structure is located within the opening slot and is sealed to the steel shell. In this embodiment, the plastic component is sealed to the inner peripheral wall of the opening slot, thus sealing the cap structure within the steel shell. Specifically, the plastic component is fixedly connected to the inner peripheral wall of the opening slot using a heat-sealing process, ensuring a firm connection between the plastic component and the inner peripheral wall of the opening slot.

[0078] Furthermore, an annular groove recessed into the steel shell is formed at the junction of the steel shell and the plastic part, ensuring a tight connection between the steel shell and the plastic part, and consequently, a tight connection between the cap structure and the plastic part. In one embodiment, the first end of the core is welded to the inner peripheral wall of the core cavity, and the second end of the core is welded to the current cutting-off structure 110. Since the current cutting-off structure 110 is electrically connected to the explosion-proof valve 120, and the explosion-proof valve 120 is electrically connected to the cover plate 140, the second end of the core is electrically connected to the cover plate 140 through the current cutting-off structure 110 and the explosion-proof valve 120. Because both the cover plate 140 and the explosion-proof valve 120 are glued to the inner peripheral wall of the plastic part, the cover plate 140 and the explosion-proof valve 120 are insulated and sealed to the inner wall of the opening groove through the plastic part, thereby insulating the cap structure 100 from the steel shell and ensuring the safety performance of the battery.

[0079] Compared with the prior art, the present invention has at least the following advantages:

[0080] The aforementioned cap structure 100 based on the sawtooth current cutting structure has a deformation buffer zone 1142 formed at the location where the sawtooth edge 114 is connected to the outer periphery of the current cutting piece 112 and the insulating ring 130 is connected to the outer periphery of the sawtooth edge 114. When the cap structure 100 is subjected to lateral pressure, the current cutting structure 110 buffers the deformation buffer zone 1142 through the insulating ring 130. At the same time, the gas pressure inside the battery is released through the first pressure relief hole 1143 of the sawtooth edge 114. This also avoids the problem of the current cutting structure 110 and the insulating ring 130 easily falling off and separating, thus better preventing the problem of internal positive and negative short circuits and improving the reliability of the cap structure.

[0081] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A cap structure based on a sawtooth current cutting-off structure, comprising a connected current cutting-off structure and an explosion-proof valve, characterized in that, The current cutting structure includes a current cutting plate and a serrated edge connected to the outer periphery of the current cutting plate. The current cutting plate is fixedly connected to one side of the explosion-proof valve. The cap structure also includes an insulating ring, which is connected to the outer periphery of the serrated edge. The portion of the serrated edge that connects to the insulating ring forms a deformation buffer zone, and the deformation buffer zone has at least two first pressure relief holes.

2. The cap structure based on the sawtooth current cutting structure according to claim 1, characterized in that, The number of the first pressure relief holes is n, where n is an integer greater than 2 and less than or equal to 50.

3. The cap structure based on the sawtooth current cutting structure according to claim 1, characterized in that, Each of the first pressure relief holes is a semi-circular hole, a semi-elliptical hole, a triangular hole, a quadrilateral hole, or a serrated hole; and / or, The first pressure relief holes of the deformation buffer are spaced apart.

4. The cap structure based on the sawtooth current cutting structure according to claim 1, characterized in that, The total area of ​​all the first pressure relief holes on the serrated edge is S. 孔 The area enclosed by the outer periphery contour line of the current interruption structure on the serrated edge is S. 总 The area ratio of the first pressure relief hole is S. 孔 / S 总 S 孔 / S 总 It ranges from 0.01% to 25%.

5. The cap structure based on the sawtooth current cutting structure according to claim 4, characterized in that, S 孔 / S 总 It ranges from 2% to 5%.

6. The cap structure based on the sawtooth current cutting structure according to claim 1, characterized in that, The current cut-off plate is welded to the explosion-proof valve.

7. The cap structure based on the sawtooth current cutting structure according to claim 6, characterized in that, A second pressure relief hole is provided at the location where the current cut-off piece is welded to the explosion-proof valve.

8. The cap structure based on the sawtooth current cutting structure according to claim 1, characterized in that, The deformation buffer zone is circular in shape.

9. A battery, characterized in that, The cap structure includes any one of claims 1 to 8 based on the sawtooth current cutting structure.

10. The battery according to claim 9, characterized in that, The battery is a cylindrical battery.

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