Lower plastic part of battery, top cover assembly and battery

Abstract

The utility model discloses a lower plastic part of a battery, a top cover assembly and the battery, and belongs to the field of battery manufacturing, the lower plastic part of the battery comprises a lower plastic body, a deformation body and a surrounding body, the deformation body is connected with the lower plastic body, and a first groove is arranged between the deformation body and the lower plastic body; the surrounding body is connected with the deformation body, a second groove is formed between the surrounding body and the deformation body, the second groove and the first groove are spaced through the deformation body, and a pole through hole is defined by the surrounding body; and the deformation body can be deformed in a space between the second groove and the first groove. Due to the design of the deformation body, the size and the position of the assembly can be finely adjusted in the assembly process, the accurate matching between the lower plastic part and other parts of the battery is ensured, and the overall assembly accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, and in particular to a lower plastic part of a battery, a top cover assembly and a battery. Background Art

[0002] In the manufacturing process of lithium-ion batteries, the design and function of the battery cover are crucial to the overall performance and safety of the battery. In the design of the cover, the matching of the pole and the lower plastic is a key link. The pole is the component that connects the internal and external circuits of the battery, while the lower plastic is part of the top cover, usually made of plastic material, used to form an electrical connection with the metal pole of the battery case. Controlling the gap between the two is crucial to ensure battery performance and safety.

[0003] In the prior art, a sealing ring is installed in the gap between the pole and the lower plastic. For example, a Chinese patent with publication number CN219959197U discloses a battery cover and a square secondary battery. The specification thereof records that an installation gap is formed between the column and the inner wall of the pole opening, and then a sealing ring is sleeved on the column to seal the installation gap, that is, the inner and outer sides of the sealing ring are respectively in contact with the inner wall of the pole opening and the outer wall of the column, so as to achieve insulation and sealing between the pole and the substrate.

[0004] However, due to the manufacturing tolerances of the pole diameter and the pole through hole diameter set on the lower plastic, changes in these tolerances may lead to unstable gap size. If the gap is too large, it may cause the risk of high-voltage breakdown; if the gap is too small, the sealing ring may squeeze the lower plastic due to excessive expansion, causing the lower plastic to deform, thereby affecting the structural integrity and performance of the battery. In addition, when the electrolyte flows inside the battery, if the gap is not properly controlled, negative electrode powder may accumulate in these areas, leading to potential problems such as voltage instability and aluminum shell corrosion.

[0005] Therefore, the prior art still needs to be improved and developed. Utility Model Content

[0006] The main purpose of the utility model is to provide a lower plastic part of a battery, a top cover assembly and a battery, aiming to solve the problem of unstable gap size. When the gap is too large, there are risks of high voltage breakdown, accumulation of negative electrode powder leading to voltage instability, and corrosion of the aluminum shell; when the gap is too small, the sealing ring over-expands and squeezes the lower plastic, causing deformation of the lower plastic.

[0007] To achieve the above-mentioned purpose, the utility model proposes a lower plastic part of a battery, comprising a lower plastic body, a deformable body and a surrounding body, wherein the deformable body is connected to the lower plastic body, and a first groove is provided between the deformable body and the lower plastic body; and the surrounding body is connected to the deformable body, and a second groove is provided between the surrounding body and the deformable body, the second groove and the first groove are spaced apart by the deformable body, and the surrounding body defines a pole through hole; wherein the deformable body can be deformed in the space between the second groove and the first groove.

[0008] In an optional implementation manner of the present application, an opening direction of the first groove is opposite to an opening direction of the second groove.

[0009] In an optional implementation manner of the present application, the deformable body includes a first deformable portion and a second deformable portion connected to each other, and a third groove is provided between the first deformable portion and the second deformable portion;

[0010] The opening direction of the third groove is opposite to the opening direction of the first groove and the opening direction of the second groove, and the opening direction of the first groove and the opening direction of the second groove are the same.

[0011] In an optional implementation manner of the present application, a thickness of the surrounding body along the radial direction of the pole through hole is greater than a thickness of the deformation body along the radial direction of the pole through hole.

[0012] In an optional implementation manner of the present application, the thickness of the deformation body along the radial direction of the pole through hole is a, and a satisfies: 0.2mm≤a≤1.0mm; and / or

[0013] The thickness of the surrounding body along the radial direction of the pole through hole is b, and b satisfies: 0.6 mm ≤ b ≤ 2.0 mm; and / or

[0014] A difference between a thickness of the surrounding body along a radial direction of the pole through hole and a thickness of the deformation body along a radial direction of the pole through hole is c, and c satisfies: 0.2 mm≤c≤1.8 mm.

[0015] In an optional implementation manner of the present application, the deformation body is tilted relative to the surrounding body and the lower plastic body, and the tilt angle of the deformation body relative to the surrounding body is equal to the tilt angle of the deformation body relative to the lower plastic body.

[0016] In an optional implementation manner of the present application, the first groove and the second groove are both arranged around the circumference of the pole through hole; and / or

[0017] The first groove and the second groove are symmetrically arranged relative to the deformation body.

[0018] In an optional implementation manner of the present application, the width of the first groove and / or the second groove gradually decreases from the opening to the bottom.

[0019] The utility model also provides a top cover assembly of a battery, comprising a pole, a sealing ring and a lower plastic part of the battery as described above; the sealing ring is sleeved on the outer wall of the pole; and the pole and the sealing ring are inserted into the pole through hole; wherein, when the sealing ring expands, it can squeeze the surrounding body and the deformation body and cause the deformation body to deform.

[0020] In an optional embodiment of the present application, the sealing ring includes a first sealing part and a second sealing part that are connected, and a side of the first sealing part away from the second sealing part is in contact with a side of the surrounding body away from the deformation body, and a side of the second sealing part away from the first sealing part is sleeved on the outer wall of the pole.

[0021] In an optional embodiment of the present application, the axial height of the second sealing portion along the pole through hole is greater than the axial height of the first sealing portion along the pole through hole; the upper surface of the first sealing portion is roughly flush with the upper surface of the surrounding body, and the lower surface of the first sealing portion is roughly flush with the lower surface of the surrounding body.

[0022] The utility model also provides a battery, comprising the top cover assembly as described above.

[0023] When the surrounding body of the lower plastic part of the utility model is subjected to an external force, such as the expansion force of the sealing ring sleeved on the pole, the surrounding body transmits the force to the deformable body connected thereto, and the deformable body can be deformed in the space between the second groove and the first groove, that is, the deformable body is allowed to deform freely within a certain space, thereby improving the adaptability and impact resistance of the lower plastic part to mechanical stress, maintaining the overall stability of the battery, especially the stability of the top cover assembly of the battery.

[0024] The design of the deformation body allows fine-tuning of the size and position of the components during the assembly process, ensuring precise fit between the lower plastic part and other battery components, improving the accuracy of the overall assembly.

[0025] In actual use, the pole through hole on the lower plastic part can be equipped with a pole and a sealing ring sleeved on the pole. The sealing ring squeezes the lower plastic part during expansion, and the deformation body deforms in the space between the first groove and the second groove, avoiding the problem of too large or too small gap size caused by unstable manufacturing tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the battery in the embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the assembly of the top cover assembly in the embodiment of the present application;

[0029] Figure 3 This is a structural exploded view of two lower plastic parts in the embodiment of the present application;

[0030] Figure 4 is a three-dimensional diagram of a top cover assembly in an embodiment of the present application;

[0031] Figure 5 It is a structural exploded diagram of the top cover assembly in the embodiment of the present application;

[0032] Figure 6 It is a schematic diagram of the structure of the top cover assembly in the embodiment of the present application;

[0033] Figure 7 for Figure 6 Section view along the AA` section line;

[0034] Figure 8 for Figure 7 Enlarged view of middle part B;

[0035] Fig. 9 This is a schematic structural diagram of a top cover assembly in another embodiment of the present application;

[0036] Fig.10 for Fig. 9 Sectional view along CC` section line;

[0037] Fig.11 for Fig.10 Enlarged view of part D in the middle.

[0038] Description of Figure Numbers:

[0039] 1. Battery; 10. Top cover assembly; 11. Post; 12. Sealing ring; 121. First sealing portion; 122. Second sealing portion; 13. Lower plastic part; 131. Lower plastic body; 132. Deformer; 133. Surrounding body; 133a. Post through hole; 134. First groove; 135. Second groove.

[0040] 20. Top cover assembly; 21. Pole; 22. Sealing ring; 23. Lower plastic part; 231. Lower plastic body; 232. Deformer; 2321. First deformation part; 2322. Second deformation part; 233. Surrounding body; 233a. Pole through hole; 234. First groove; 235. Second groove; 236. Third groove.

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. All other embodiments obtained by those skilled in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0043] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] See also Figure 1 The embodiment of the present application provides a battery 1, which is an energy storage device that can convert chemical energy into electrical energy. The basic components of the battery 1 include a top cover assembly 10, a battery cell and a switching piece, wherein the top cover assembly 10 is a part of the battery 1 package, which covers the top of the battery 1 and plays a role in sealing and protecting the internal structure of the battery 1.

[0045] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 In one implementation of the embodiment of the present application, the top cover assembly 10 includes a pole 11, a sealing ring 12 and a lower plastic part 13. The top cover assembly 10 may be provided with one or more lower plastic parts 13, and the number of the lower plastic parts 13 may be flexibly adjusted according to the specific requirements and specifications of the battery 1 to adapt to different battery 1 designs and application scenarios.

[0046] Exemplarily, the lower plastic part 13 is an insulating lower plastic part 13 , which can provide an insulating barrier between the pole 11 of the battery 1 and the battery 1 housing, prevent the generation of short circuits and arcs, and ensure the safe operation of the battery 1 .

[0047] Exemplarily, a pole through hole 133a is provided on the lower plastic part 13, and the pole 11 is inserted into the pole through hole 133a. The design of the pole through hole 133a provides a stable mechanical support point for the pole 11 to prevent the pole 11 from moving or deflecting inside the battery 1. The sealing ring 12 is at least partially provided in the pole through hole 133a. Specifically, the sealing ring 12 is sleeved on the outer wall of the pole 11, and the sealing ring 12 and the pole 11 are inserted into the pole through hole 133a together. Exemplarily, an accommodation gap is formed between the outer wall of the pole 11 and the inner wall of the pole through hole 133a. The sealing ring 12 is installed in the accommodation gap, which can effectively prevent the leakage of electrolyte and external contaminants from entering the interior of the battery 1, further improving the sealing and protection level of the battery 1.

[0048] In other optional embodiments, the top cover assembly 10 further includes a cover plate, which abuts against the pole 11 and the sealing ring 12, and squeezes the sealing ring 12 to ensure the sealing performance of the battery 1. After being squeezed, the sealing ring 12 expands and clings to the outer wall of the pole 11 and the lower plastic part 13. However, in actual applications, the sealing ring 12 will deform after being squeezed, such as expanding, and exert a force on the lower plastic part 13. In order to release the force from the sealing ring 12 and ensure the performance of the top cover assembly 10, in the embodiment of the present application, at least part of the lower plastic part 13 can be deformed to release the force from the sealing ring 12.

[0049] In an optional manner, for example, one side of the lower plastic part 13 that is in contact with the sealing ring 12 is designed to be not completely in contact with the sealing ring 12. When the sealing ring 12 squeezes the lower plastic part 13, the part in contact with the sealing ring 12 can be deformed, and a part of the force from the sealing ring 12 can be released to a certain extent. However, in actual applications, the sealing ring 12 is a flexible component. When the sealing ring 12 is deformed by a force, such as during expansion, the sealing ring 12 and the lower plastic part 13 may not have good contact, resulting in uneven force and poor effect of releasing the force.

[0050] like Figure 6 , Figure 7 and Figure 8As shown, in one implementation of the embodiment of the present application, the lower plastic part 13 includes a lower plastic body 131, a deformable body 132 and a surrounding body 133, the deformable body 132 is connected to the lower plastic body 131, and a first groove 134 is provided between the deformable body 132 and the lower plastic body 131; and the surrounding body 133 is connected to the deformable body 132, and a second groove 135 is provided between the surrounding body 133 and the deformable body 132, the second groove 135 and the first groove 134 are separated by the deformable body 132, and the surrounding body 133 defines a pole through hole 133a. The deformable body 132 can be deformed in the space between the second groove 135 and the first groove 134, such as when the surrounding body 133 is subjected to a force, the force can be transmitted to the deformable body 132, so that the deformable body 132 is deformed in the space between the second groove 135 and the first groove 134.

[0051] In this embodiment, when the surrounding body 133 of the lower plastic part 13 is subjected to an external force such as the expansion force of the sealing ring 12 sleeved on the pole 11, the surrounding body 133 transmits the force to the deformable body 132 connected thereto, and the deformable body 132 can be deformed in the space between the second groove 135 and the first groove 134, that is, the deformable body 132 is allowed to deform freely within a certain space, thereby improving the adaptability and impact resistance of the lower plastic part 13 to mechanical stress, and maintaining the overall stability of the battery 1, especially the stability of the top cover assembly 10 of the battery 1.

[0052] The design of the deformation body 132 allows the size and position of the component to be fine-tuned during the assembly process, ensuring the precise fit between the lower plastic part 13 and other components of the battery 1, thereby improving the overall assembly accuracy.

[0053] The surrounding body 133 defines a pole through hole 133 a, which helps to form a tight fit with other components of the top cover assembly 10 (such as the pole 11 and the sealing ring 12), thereby improving the sealing performance of the battery 1.

[0054] Exemplarily, the pole through hole 133a is defined by the surround 133, that is, the distances between the lower plastic body 131, the deformation body 132 and the surround 133 and the pole through hole 133a decrease successively, and the lower plastic body 131 is farthest from the pole through hole 133a, which can provide stable base support. The design in which the distances between the deformation body 132 and the surround 133 and the pole through hole 133a gradually decrease helps to form a structure that transitions from stability to flexibility, which not only maintains the overall stability of the lower plastic part 13, but also allows necessary local deformation.

[0055] Exemplarily, the sealing ring 12 disclosed in this embodiment is installed in the accommodating gap and abuts against the surrounding body 133. When the sealing ring 12 is subjected to external force, the external force can be more effectively transferred from the surrounding body 133 to the deformation body 132. The distance between the deformation body 132 and the pole through hole 133a is smaller than the distance between the lower plastic body 131 and the pole through hole 133a. It can be ensured that when subjected to force, deformation mainly occurs on the deformation body 132, rather than on the entire lower plastic part 13. More precise control of local deformation, avoidance of unnecessary overall deformation, and protection of the internal structure of the battery 1 from damage.

[0056] Compared with designing a deformable structure on the side where the surround 133 and the sealing ring 12 are in contact to alleviate the force from the sealing ring 12, the deformable body 132 disclosed in the embodiment of the present application is arranged on the side of the surround 133 away from the sealing ring 12. By using the surround 133 as an intermediate layer, the force applied by the sealing ring 12 can be more evenly transmitted to the deformable body 132, thereby reducing the stress concentration problem that may be caused by designing a deformable structure directly on the surround 133; and the direct and tight contact between the surround 133 and the sealing ring 12 can provide a more stable sealing interface, thereby reducing the gap between the surround 133 and the sealing ring 12.

[0057] For example, the lower plastic body 131 disclosed in this embodiment has a first groove 134 between it and the deformation body 132, and a second groove 135 between the surrounding body 133 and the deformation body 132; if only one groove is provided, stress will be concentrated at a certain point, resulting in excessive deformation, increasing the risk of damage to the lower plastic part 13. Providing two grooves can disperse and relieve the force on the outside of the lower plastic part 13, so that the stress is more evenly distributed on the deformation body 132, thereby improving the durability of the lower plastic part 13.

[0058] The descriptions of "first", "second", etc. in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0059] It should be noted that the deformation body 132 may be one structural member or at least two structural members. For example, the embodiment of the present application is described by taking the deformation body 132 as one structural member as an example.

[0060] Exemplarily, when the surrounding body 133 disclosed in this embodiment receives a force, it can be transmitted to the deformation body 132, so that the deformation body 132 is deformed in the space between the second groove 135 and the first groove 134. The setting of the first groove 134 and the second groove 135 provides a predetermined deformation space for the deformation body 132, thereby ensuring the sealing and overall performance of the battery 1 cover.

[0061] Exemplarily, at least one first groove 134 disclosed in the present embodiment may be provided, and at least one first groove 134 is arranged between the deformation body 132 and the lower plastic body 131. At least one first groove 134 provides more deformation points, so that the deformation body 132 can adapt to and absorb these forces more flexibly when subjected to forces, thereby improving the deformation adaptability of the overall structure. Exemplarily, there is a first groove 134 between the deformation body 132 and the lower plastic body 131. The one first groove 134 in the embodiment of the present application is conducive to simplifying the design and manufacturing process of the overall structure. It should be understood that the first groove 134 in the embodiment of the present application is taken as one as an example, and the number of the first grooves 134 can also be designed to be two or three, which will not be repeated here.

[0062] Exemplarily, the present embodiment discloses that at least one second groove 135 may be provided, and at least one second groove 135 is arranged between the deformation body 132 and the surrounding body 133. The design of at least one second groove 135 provides more design parameters, which can be adjusted according to the specific requirements and application conditions of the battery 1 to meet specific performance goals. Exemplarily, there is a second groove 135 between the surrounding body 133 and the deformation body 132. The one second groove 135 in the embodiment of the present application is conducive to simplifying the design and manufacturing process of the overall structure. It should be understood that the embodiment of the present application takes one second groove 135 as an example, and the number of second grooves 135 can also be designed to be two or three, which will not be repeated here.

[0063] Exemplarily, the spatial volume of the accommodating gap disclosed in this embodiment is smaller than the theoretical expansion volume of the sealing ring 12 after being subjected to an external force, so that when the sealing ring 12 expands due to the force, it squeezes the surrounding body 133 in the direction toward the lower plastic body 131 and transmits the force to the deformation body 132, so that the sealing ring 12 completely fills the accommodating gap.

[0064] Exemplarily, the lower plastic body 131, the deformation body 132 and the surrounding body 133 disclosed in this embodiment are integrally formed to ensure that there are no seams between the various parts of the lower plastic part 13, thereby reducing the need for separate processing and subsequent assembly of multiple parts and possible errors during the assembly process; and the upper and lower surfaces of the lower plastic body 131, the deformation body 132 and the surrounding body 133 are flush with each other, so that after the surrounding body 133 squeezes the deformation body 132, the three remain flat along the axial direction of the pole through hole 133a, thereby improving stability.

[0065] Please continue reading Figure 8 In one implementation of the embodiment of the present application, the sealing ring 12 includes a first sealing portion 121 and a second sealing portion 122 connected to each other. A side of the first sealing portion 121 away from the second sealing portion 122 is in contact with a side of the surrounding body 133 away from the deformation body 132. The contact between the first sealing portion 121 and the surrounding body 133 can serve as a stress buffer zone. A side of the second sealing portion 122 away from the first sealing portion 121 is sleeved on the outer wall of the pole 11. The second sealing portion 122 provides additional fixation and support for the pole 11, thereby enhancing the overall structural stability of the top cover assembly 10.

[0066] Exemplarily, the first sealing portion 121 and the second sealing portion 122 are in a stepped structure, and the axial height of the second sealing portion 122 along the pole through hole 133a is greater than the axial height of the first sealing portion 121 along the pole through hole 133a, and the side of the second sealing portion 122 facing away from the first sealing portion 121 abuts against the outer wall of the pole 11, and the side of the first sealing portion 121 facing away from the second sealing portion 122 abuts against the surrounding body 133, so that the second sealing portion 122 can provide a wider contact area in the axial direction and abut more tightly against the outer wall of the pole 11, thereby enhancing the sealing effect and effectively preventing electrolyte leakage or intrusion of other external contaminants.

[0067] The upper surface of the first sealing portion 121 disclosed in this embodiment is roughly flush with the upper surface of the surrounding body 133, and the lower surface of the first sealing portion 121 is roughly flush with the lower surface of the surrounding body 133, ensuring that the first sealing portion 121 uniformly squeezes the surrounding body 133, ensuring a tight fit between the first sealing portion 121 and the surrounding body 133, and forming a continuous sealing interface after squeezing, thereby improving the overall assembly quality. That is, the height of the first sealing portion 121 in the embodiment of the present application is roughly equal to the height of the surrounding body 133, or the thickness of the first sealing portion 121 is roughly equal to the thickness of the surrounding body 133. It should be noted that the size relationship between the first sealing portion 121 and the surrounding body 133 in the embodiment of the present application is not limited to this, such as the height of the first sealing portion 121 can also be slightly greater than the height of the surrounding body 133.

[0068] Illustratively, the side of the first sealing portion 121 disclosed in this embodiment that is away from the second sealing portion 122 abuts against the side of the surrounding body 133 that is away from the deformation body 132, which can maximize the contact area and evenly distribute the force on the contact surface, reduce local stress concentration, and provide a more reliable sealing abutment effect.

[0069] In one implementation of the embodiment of the present application, the opening direction of the first groove 134 is opposite to the opening direction of the second groove 135, so that when the surrounding body 133 is subjected to external force, the first groove 134 and the second groove 135 with opposite opening directions can better guide the distribution of force. During the extrusion process, the groove space within the first groove 134 and the second groove 135 is eliminated, so that the contact surface between the surrounding body 133 and the sealing ring 12 can still remain flat after extrusion, which helps to maintain a good sealing contact.

[0070] In one implementation of the embodiment of the present application, the deformation body 132 is tilted relative to the surrounding body 133 and the lower plastic body 131, and the tilt angle of the deformation body 132 relative to the surrounding body 133 is equal to the tilt angle of the deformation body 132 relative to the lower plastic body 131, that is, the longitudinal cross-sections of the lower plastic body 131, the deformation body 132 and the surrounding body 133 are N-shaped or reversed N-shaped, and the design with the same tilt angle enables the deformation body 132 to produce the expected deformation when squeezed without excessive deformation or damage. The N-shaped or reversed N-shaped longitudinal cross-section design helps the deformation body 132 to be more closely in contact with the surrounding body 133 and the lower plastic body 131 when subjected to force, thereby reducing the accumulation of negative electrode powder in the first groove 134 and the second groove 135 during the flow of the electrolyte.

[0071] It should be noted that it is also feasible that the inclination angle of the deformation body 132 relative to the surrounding body 133 is not equal to the inclination angle of the deformation body 132 relative to the lower plastic body 131 .

[0072] Illustratively, in one implementation of the embodiment of the present application, the deformation body 132 is arranged to be inclined upward or downward in an arc shape relative to the surrounding body 133 and the lower plastic body 131, or the deformation body 132 is arranged to be inclined upward or downward in a curved line segment relative to the surrounding body 133 and the lower plastic body 131. The designer can flexibly adjust the inclination angle and shape of the deformation body 132 according to specific requirements and application conditions, which will not be repeated here.

[0073] It should be noted that the longitudinal cross-sections of the lower plastic body 131, the deformable body 132 and the surrounding body 133 may be N-shaped, reverse N-shaped, M-shaped, W-shaped or curved, and the designer may adjust the inclination angle and size of the deformable body 132, the lower plastic body 131 and the surrounding body 133 as needed to adapt to different battery 1 specifications and performance requirements, providing greater design flexibility. The following describes different structural forms of the deformable body 132 and different connection relationships between the deformable body 132, the lower plastic body 131 and the surrounding body 133 in conjunction with other drawings.

[0074] Exemplarily, in one implementation of the embodiment of the present application, the radial thickness of the surround 133 along the pole through hole 133a is greater than the radial thickness of the deformation body 132 along the pole through hole 133a, that is, the deformation body 132 is a deformation weak point. When the surround 133 is subjected to external force, the deformation body 132 is more likely to deform in the preset first groove 134 and the second groove 135 due to its thinner thickness, thereby maintaining good sealing performance of the overall structure.

[0075] In one implementation of the embodiment of the present application, the thickness of the deformation body 132 along the radial direction of the pole through hole 133a is a, and a satisfies: 0.2mm≤a≤1.0mm; on the one hand, the thickness of the deformation body 132 within this range can ensure that it has sufficient strength to withstand certain mechanical stresses and has certain toughness to adapt to deformation, so as to maintain stability when the battery 1 is running and the external environment changes; on the other hand, during the charging and discharging process of the battery 1, the deformation body 132 may be affected by thermal expansion. Appropriate thickness can ensure that the deformation body 132 maintains stable performance under temperature changes and prevents deformation or damage caused by thermal expansion.

[0076] In one implementation of the embodiment of the present application, the radial thickness of the surround 133 along the pole through hole 133a is b, and b satisfies: 0.6mm≤b≤2.0mm; the surround 133 can maintain good structural strength and toughness, so as to remain stable when subjected to mechanical stress and extrusion, reduce the risk of breakage, and the thickness of the surround 133 directly affects its coordination with the deformation body 132 and the lower plastic body 131. Appropriate thickness helps to improve the sealing performance of the battery 1 cover and prevent electrolyte leakage and other potential safety risks.

[0077] In one implementation of the embodiment of the present application, the difference between the thickness of the surrounding body 133 along the radial direction of the pole through hole 133a and the thickness of the deformation body 132 along the radial direction of the pole through hole 133a is c, and c satisfies: 0.2mm≤c≤1.8mm. By setting the thickness difference between the surrounding body 133 and the deformation body 132, it can be ensured that the deformation body 132 is more likely to produce the expected deformation when subjected to force, so that as a deformation weak point in the structure, the deformation body 132 can fit the lower plastic body 131 and the surrounding body 133 more closely when subjected to force.

[0078] In one implementation of the embodiment of the present application, the first groove 134 and the second groove 135 are both arranged circumferentially around the pole through hole 133a, that is, the first groove 134 is a first annular groove, and the second groove 135 is a second annular groove; the sealing ring 12 is an annular sealing ring 12, which can ensure that when the annular sealing ring 12 squeezes the surrounding body 133 in the circumferential direction, a good all-round sealing effect is achieved, and a consistent deformation effect is achieved, so that the contact between the annular sealing ring 12 and the surrounding body 133 is closer, thereby preventing damage to the structure of the lower plastic part 13 due to uneven deformation.

[0079] In one implementation of the embodiment of the present application, the first groove 134 and the second groove 135 are symmetrically arranged relative to the deformation body 132. The symmetrically arranged first groove 134 and second groove 135 help to produce uniform and balanced deformation when the deformation body 132 is subjected to force, thereby avoiding structural damage or functional failure due to uneven deformation.

[0080] In one implementation of the embodiment of the present application, the width of the first groove 134 and / or the second groove 135 gradually decreases from its opening to its bottom. The gradual reduction of the groove width can reduce the stress concentration at the groove opening, while providing better support at the bottom of the groove to prevent excessive deformation or damage.

[0081] In this implementation, the widest opening of the first groove 134 and / or the second groove 135 is the upper surface and the lower surface of the lower plastic part 13, and the wider opening portion of the first groove 134 and / or the second groove 135 will first deform, and as the deformation penetrates deeper into the first groove 134 and / or the second groove 135, the deformation is gradually limited, so that the deformation process and range can be more accurately controlled.

[0082] Exemplarily, the depth values ​​of the first groove 134 and the second groove 135 disclosed in this embodiment are smaller than the axial height value of the deformation body 132 along the pole through hole 133a. It is understandable that the first groove 134 and the second groove 135 are not arranged through, so as to avoid the accumulation of negative electrode powder and overlap the pole 11 with the cover plate, causing problems such as poor voltage and corrosion of the aluminum shell.

[0083] The battery 1 of the embodiment of the present application can be a lithium battery, which is a lithium-based rechargeable battery 1, which is widely used in portable electronic devices, power tools, electric vehicles, energy storage systems and other fields. Lithium batteries have become the preferred power supply solution in modern electronic devices due to their advantages such as high energy density, low self-discharge rate, long life and good temperature adaptability. The lithium battery includes a top cover assembly 10. In the structure of the lithium battery, the top cover assembly 10 is a key part. It is located at the top of the battery 1 and serves to connect the internal and external circuits of the battery 1 and ensure the sealing and safety of the battery 1. It can be understood that the battery 1 of the embodiment of the present application is not limited to lithium batteries.

[0084] For example, Fig. 9 , Fig.10 and Fig.11 As shown, the difference between the top cover assembly 20 and the top cover assembly 10 of the embodiment of the present application at least includes: the lower plastic part 23 includes at least three grooves, such as the lower plastic part 23 includes a first groove 234, a third groove 236 and a second groove 235 which are arranged in sequence at intervals.

[0085] The other structural parts of the top cover assembly 20 except the lower plastic part 23 can refer to the top cover assembly 10, such as the pole 21 and the sealing ring 22 of the top cover assembly 20, which can refer to the pole 11 and the sealing ring 12 respectively, and the embodiments of the present application will not be repeated here.

[0086] The first groove 234 is formed between the deformation body 232 of the lower plastic part 23 and the lower plastic body 231, and the second groove 235 is formed between the deformation body 232 of the lower plastic part 23 and the surrounding body 233. Exemplarily, the first groove 234 and the second groove 235 have the same opening direction.

[0087] The deformation body 232 includes at least one groove, such as the deformation body 232 includes a third groove 236. Exemplarily, the deformation body 232 includes a first deformation part 2321 and a second deformation part 2322 connected to each other, and the third groove 236 is provided between the first deformation part 2321 and the second deformation part 2322.

[0088] The opening direction of the third groove 236 is opposite to the opening direction of the first groove 234 and the opening direction of the second groove 235. The deformation body 232 is tilted relative to the surrounding body 233 and the lower plastic body 231, that is, the longitudinal cross-sections of the lower plastic body 231, the deformation body 232 and the surrounding body 233 are M-shaped or W-shaped. The first deformation part 2321 can be deformed in the first groove 234 and the third groove 236, and the second deformation part 2322 can be deformed in the third groove 236 and the second groove 235, which helps to accurately control the position and degree of deformation.

[0089] The structure of the lower plastic body 231 may refer to the lower plastic body 131 , and the structure of the surrounding body 233 may refer to 133 . For example, the pole through hole 233 a defined by the surrounding body 233 may refer to the pole through hole 133 a , and the embodiments of the present application will not be described in detail herein.

[0090] Among them, the shapes of the first deformation portion 2321 and the second deformation portion 2322 can be roughly the same or different. The first deformation portion 2321 and the second deformation portion 2322 in the embodiment of the present application can refer to the deformation body 132, which will not be repeated here.

[0091] The difference between the lower plastic part 23 and the lower plastic part 13 includes: the first groove 234 and the second groove 235 are arranged axially symmetrically, and the first groove 134 and the second groove 135 are arranged centrally symmetrically.

[0092] In one implementation of the embodiment of the present application, the deformation body also includes three deformation parts, and the deformation body may also include two grooves, such as the deformation body includes a first deformation part, a second deformation part and a third deformation part connected in sequence, a third groove is defined between the first deformation part and the second deformation part, and a fourth groove is defined between the second deformation part and the third deformation part, a second groove is defined between the deformation body and the surrounding body, a first groove is defined between the deformation body and the lower plastic body, the first groove and the third groove are adjacent and have opposite opening directions, the second groove and the fourth groove are adjacent and have opposite opening directions, and the third groove and the fourth groove are adjacent and have opposite opening directions. Grooves with different opening directions help optimize the force transmission path so that the force can be more evenly distributed, thereby improving the mechanical properties of the entire component.

[0093] In some cases, the opening directions of the multiple grooves of the lower plastic part 13 disclosed in this embodiment follow a certain pattern, such as the opening directions of adjacent grooves are opposite, which helps to simplify the mold design and manufacturing process and reduce production costs.

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lower plastic part of a battery, characterized in that: include: Lower plastic body; A deformation body, wherein the deformation body is connected to the lower plastic body, and a first groove is formed between the deformation body and the lower plastic body; as well as A surrounding body, the surrounding body is connected to the deformable body, and a second groove is provided between the surrounding body and the deformable body, the second groove is spaced from the first groove by the deformable body, and the surrounding body defines a pole through hole; The deformable body can be deformed in the space between the second groove and the first groove.

2. The lower plastic part of the battery according to claim 1, characterized in that: An opening direction of the first groove is opposite to an opening direction of the second groove.

3. The lower plastic part of the battery according to claim 1, characterized in that: The deformable body comprises a first deformable portion and a second deformable portion connected to each other, and a third groove is provided between the first deformable portion and the second deformable portion; The opening direction of the third groove is opposite to the opening direction of the first groove and the opening direction of the second groove, and the opening direction of the first groove and the opening direction of the second groove are the same.

4. The lower plastic part of the battery according to any one of claims 1 to 3, characterized in that: The thickness of the surrounding body along the radial direction of the pole through hole is greater than the thickness of the deformation body along the radial direction of the pole through hole.

5. The lower plastic part of the battery according to claim 4, characterized in that: The thickness of the deformed body along the radial direction of the pole through hole is a, and a satisfies: 0.2mm≤a≤1.0mm; and / or The thickness of the surrounding body along the radial direction of the pole through hole is b, and b satisfies: 0.6mm≤b≤2.0mm; and / or A difference between a thickness of the surrounding body along a radial direction of the pole through hole and a thickness of the deformation body along a radial direction of the pole through hole is c, and c satisfies: 0.2 mm≤c≤1.8 mm.

6. The lower plastic part of the battery according to any one of claims 1 to 3, characterized in that: The deformation body is tilted relative to the surrounding body and the lower plastic body, and the tilt angle of the deformation body relative to the surrounding body is equal to the tilt angle of the deformation body relative to the lower plastic body.

7. The lower plastic part of the battery according to any one of claims 1 to 3, characterized in that: The first groove and the second groove are both arranged around the circumference of the pole through hole; and / or The first groove and the second groove are symmetrically arranged relative to the deformation body.

8. The lower plastic part of the battery according to any one of claims 1 to 3, characterized in that: The width of the first groove and / or the second groove gradually decreases from the opening to the bottom.

9. A top cover assembly of a battery, characterized in that: The top cover assembly comprises: Pole; A sealing ring, wherein the sealing ring is sleeved on the outer wall of the pole; and The lower plastic part of the battery according to any one of claims 1 to 8, wherein the pole and the sealing ring are inserted into the pole through hole; When the sealing ring expands, it can squeeze the surrounding body and the deformation body and cause the deformation body to deform.

10. The top cover assembly of the battery according to claim 9, characterized in that: The sealing ring includes a first sealing part and a second sealing part connected to each other. A side of the first sealing part away from the second sealing part is in contact with a side of the surrounding body away from the deformation body. A side of the second sealing part away from the first sealing part is sleeved on the outer wall of the pole.

11. The top cover assembly of the battery according to claim 10, characterized in that: The axial height of the second sealing portion along the pole through hole is greater than the axial height of the first sealing portion along the pole through hole; An upper surface of the first sealing portion is substantially flush with an upper surface of the surrounding body, and a lower surface of the first sealing portion is substantially flush with a lower surface of the surrounding body.

12. A battery, characterized in that: Comprising a top cover assembly as described in any one of claims 9-11.

Images