Cover plate mechanism and battery

Abstract

The invention provides a cover plate mechanism and a battery, relates to the technical field of battery accessories, and aims to optimize a cover plate structure to a certain extent, improve the structural strength of the cover plate and ensure the structural strength of an anti-explosion valve. The cover plate mechanism provided by the invention comprises a light aluminum plate and an anti-explosion sheet, a containing hole is formed in the smooth aluminum plate, the anti-explosion piece is arranged in the containing hole, and a thickening part is formed in the position, surrounding the edge of the containing hole, of the smooth aluminum plate. The size of each containing hole in the length direction of the light aluminum plate is a, the size of each thickening part in the length direction of the light aluminum plate is A, the size of each containing hole in the width direction of the light aluminum plate is b, the size of each thickening part in the width direction of the light aluminum plate is B, and the A-a = B-b is larger than or equal to 3mm and smaller than or equal to 5mm. And the thickness of the thickening part is gradually reduced from the position close to the accommodating hole to the position far away from the accommodating hole.

Description

Technical Field

[0001] The present invention relates to the technical field of battery accessories, and particularly to a cover plate mechanism and a battery. Background Art

[0002] An explosion-proof valve is generally integrated on the pole group cover plate. Its main function is to relieve pressure and exhaust gas, and it is used for the directional release of high-temperature and high-pressure gas inside when the pole group undergoes thermal runaway due to reasons such as mechanical impact and abnormal internal short circuit, thereby improving the safety performance of the battery pack.

[0003] In the manufacturing stage, explosion-proof valve welding holes are pre-punched and reserved on the cover plate. After the explosion-proof sheet undergoes processes such as stamping - annealing - cleaning - baking separately, it is welded to the cover plate to form an explosion-proof valve. However, in the actual manufacturing process of the cover plate, due to the combined action of the stamping fixture and the heat influence of the explosion-proof sheet welding, the thickness of the cover plate within a certain range around the explosion-proof valve hole of the finished cover plate is often lower than the set value. Moreover, when the cover plate is welded and sealed to the periphery of the housing during the pole group manufacturing process, it will also cause heat influence on the explosion-proof valve, resulting in insufficient thickness in the formed cover plate area and affecting the strength of the overall structure.

[0004] Therefore, there is an urgent need to provide a cover plate mechanism and a battery to solve the problems existing in the prior art to a certain extent. Summary of the Invention

[0005] The purpose of the present invention is to provide a cover plate mechanism and a battery to optimize the cover plate structure to a certain extent, improve the strength of the cover plate structure, and ensure the strength of the explosion-proof valve structure.

[0006] A cover plate mechanism provided by the present invention includes a light aluminum plate and an explosion-proof sheet; a receiving hole is formed on the light aluminum plate, the explosion-proof sheet is disposed in the receiving hole, and the light aluminum plate forms a thickening portion around the edge position of the receiving hole; the size of the receiving hole in the length direction of the light aluminum plate is a, the size of the thickening portion in the length direction of the light aluminum plate is A, the size of the receiving hole in the width direction of the light aluminum plate is b, and the size of the thickening portion in the width direction of the light aluminum plate is B, satisfying 3mm ≤ A - a = B - b ≤ 5mm, and the thickness of the thickening portion gradually decreases from the position close to the receiving hole to the position far from the receiving hole.

[0007] Among them, the receiving hole is kidney-shaped, the thickening portion is formed around the circumference of the receiving hole, and a racetrack-shaped structure is formed.

[0008] Specifically, the outer contour of the thickening portion is rectangular, and the size B of the thickening portion in the width direction of the light aluminum plate is the same as the width of the light aluminum plate.

[0009] Further, the preset thickness value of the thickening portion is W2, and the designed thickness value of the light aluminum plate is W1, satisfying 0.01 ≤ W2 - W1 ≤ 0.07.

[0010] Furthermore, if the reference thickness of the light aluminum plate is 2 mm, then the designed thickness value of the light aluminum plate is W3, and the preset thickness value of the thickening portion is W4, satisfying 0.01 (W3 / W1) ≤ W4 - W3 ≤ 0.07 (W3 / W1).

[0011] Among them, the cover mechanism provided by the present invention further includes a protective film, and the protective film covers the explosion-proof sheet.

[0012] Specifically, a liquid injection hole is formed on the light aluminum plate for injecting electrolyte.

[0013] Further, the cover mechanism provided by the present invention further includes an upper plastic and a lower plastic. The upper plastic and the lower plastic are oppositely arranged on both sides of the light aluminum plate, and the lower plastic forms an avoidance recess at a position corresponding to the accommodation hole.

[0014] Furthermore, a liquid passing hole is formed in the lower plastic at a position corresponding to the liquid injection hole.

[0015] Compared with the prior art, the cover mechanism provided by the present invention has the following advantages: The cover mechanism provided by the present invention includes a light aluminum plate and an explosion-proof sheet; a accommodation hole is formed on the light aluminum plate, the explosion-proof sheet is arranged in the accommodation hole, and a thickening portion is formed at the edge position of the light aluminum plate around the accommodation hole; the size of the accommodation hole in the length direction of the light aluminum plate is a, the size of the thickening portion in the length direction of the light aluminum plate is A, the size of the accommodation hole in the width direction of the light aluminum plate is b, and the size of the thickening portion in the width direction of the light aluminum plate is B, satisfying 3 mm ≤ A - a = B - b ≤ 5 mm, and the thickness of the thickening portion gradually decreases from the position close to the accommodation hole to the position far from the accommodation hole.

[0016] From this analysis, it can be seen that through the accommodation hole formed on the light aluminum plate, a bearing space can be provided for the explosion-proof sheet. And through the thickening portion formed at the edge position of the light aluminum plate corresponding to the accommodation hole, and in this application, the size of the thickening portion in the length direction of the light aluminum plate is A, and in the width direction is B, while the size of the accommodation hole in the length direction of the light aluminum plate is a, and in the width direction is b. Therefore, the actual size of the thickening portion in the length direction of the light aluminum plate is A - a, and the actual size in the width direction is B - b, making the size of the thickening portion satisfy 3 mm ≤ A - a = B - b ≤ 5 mm, so as to ensure that after the light aluminum plate is stamped and the explosion-proof sheet is welded, the thickness dimension at the position of the thickening portion can be close to the thickness dimension of other positions of the light aluminum plate.

[0017] It can be understood that the purpose of the present application is to ensure that after the optical aluminum plate undergoes stamping and the welding of the explosion-proof sheet, the thickness of the accommodation hole and the position around the accommodation hole approaches uniformity, so as to ensure uniform stress of the overall structure and improve the structural strength. In actual operation, since the position where the thickening part is close to the accommodation hole is more likely to be affected by the heat during the welding process, the closer to the accommodation hole, the greater the thermal shrinkage effect. Therefore, in the present application, the thickness of the thickening part gradually decreases from the position close to the accommodation hole to the position far from the accommodation hole, so that after stamping and welding, the thickness of the thickening part and other positions of the optical aluminum plate can approach uniformity, and thus the structural strength of the overall optical aluminum plate can be guaranteed to a certain extent, and the use stability of the overall cover mechanism can be improved.

[0018] In addition, the present invention also provides a battery, including a pole group, a housing, and the above-mentioned cover mechanism; the cover mechanism seals the opening of the housing and forms an accommodation space with the housing, and the pole group is arranged in the accommodation space.

[0019] The battery adopting the cover mechanism provided by the present application has a more uniform and stable explosion-proof valve structure, thus avoiding the problem of the explosion-proof valve failing under mechanical impact and other conditions due to inconsistent thickness, and improving the use safety of the overall battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of the optical aluminum plate from the first perspective in the cover mechanism provided by the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the optical aluminum plate from the second perspective in the cover mechanism provided by the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the battery provided by the embodiment of the present invention.

[0022] In the figure: 1 - cover mechanism; 101 - optical aluminum plate; 1011 - accommodation hole; 1012 - thickening part; 1013 - liquid injection hole; 102 - explosion-proof sheet; 2 - pole group; 3 - housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part rather than all of the embodiments of this application. Components of the embodiments of this application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative efforts belong to the scope of protection of this application.

[0024] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0025] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the embodiments of this application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more items.

[0028] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the accompanying drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings.

[0029] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including", and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that occur during manufacturing.

[0031] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, as will be apparent after understanding the disclosure of the present application, other configurations are possible. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0032] As Figure 1 Combined Figure 2 As shown, the present invention provides a cover plate mechanism 1, including a light aluminum plate 101 and an explosion-proof sheet 102; a receiving hole 1011 is formed on the light aluminum plate 101, the explosion-proof sheet 102 is disposed in the receiving hole 1011, and a thickening portion 1012 is formed around the edge position of the receiving hole 1011 on the light aluminum plate 101; the size of the receiving hole 1011 in the length direction of the light aluminum plate 101 is a, the size of the thickening portion 1012 in the length direction of the light aluminum plate 101 is A, the size of the receiving hole 1011 in the width direction of the light aluminum plate 101 is b, and the size of the thickening portion 1012 in the width direction of the light aluminum plate 101 is B, satisfying 3 mm ≤ A - a = B - b ≤ 5 mm, and the thickness of the thickening portion 1012 gradually decreases from the position close to the receiving hole 1011 to the position away from the receiving hole 1011.

[0033] Compared with the prior art, the cover plate mechanism 1 provided by the present invention has the following advantages: The cover plate mechanism 1 provided by the present invention can provide a bearing space for the explosion-proof sheet 102 through the accommodation holes 1011 formed in the light aluminum plate 101. And through the thickening part 1012 formed at the edge position of the light aluminum plate 101 corresponding to the accommodation holes 1011, and in the present application, the size of the thickening part 1012 in the length direction of the light aluminum plate 101 is A, and the size in the width direction of the light aluminum plate 101 is B, while the size of the accommodation holes 1011 in the length direction of the light aluminum plate 101 is a, and the size in the width direction is b. Therefore, the actual size of the thickening part 1012 in the length direction of the light aluminum plate 101 is A - a, and the actual size in the width direction of the light aluminum plate 101 is B - b, so that the size of the thickening part 1012 satisfies 3mm ≤ A - a = B - b ≤ 5mm, thereby ensuring that after the light aluminum plate 101 is stamped and the explosion-proof sheet 102 is welded, the thickness dimension at the position of the thickening part 1012 can be close to the thickness dimensions of other positions of the light aluminum plate 101.

[0034] It can be understood that the purpose of the present application is to ensure that after the light aluminum plate 101 is stamped and the explosion-proof sheet 102 is welded, the thicknesses of the accommodation holes 1011 and the peripheral positions of the accommodation holes 1011 approach consistency, so as to ensure uniform force on the overall structure and improve the structural strength. In actual operation, since the position of the thickening part 1012 close to the accommodation holes 1011 is more likely to be affected by the heat during the welding process, therefore, the closer to the accommodation holes 1011, the greater the thermal shrinkage effect. Therefore, in the present application, the thickness of the thickening part 1012 gradually decreases from the position close to the accommodation holes 1011 to the position away from the accommodation holes 1011, so that after stamping and welding, the thicknesses of the thickening part 1012 and other positions of the light aluminum plate 101 can approach consistency, and thus the structural strength of the overall light aluminum plate 101 can be guaranteed to a certain extent, and the use stability of the overall cover plate mechanism 1 can be improved.

[0035] Preferably, as Figure 2 shown, the accommodation holes 1011 in the present application are waist-shaped, and the thickening part 1012 is formed around the circumference of the accommodation holes 1011 and forms a racetrack-shaped structure.

[0036] Since the structure of the explosion-proof sheet 102 is usually waist-shaped, therefore, in the present application, by making the accommodation holes 1011 waist-shaped, it can be adapted to the explosion-proof sheet 102, improving the fit degree between the explosion-proof sheet 102 and the accommodation holes 1011, thereby improving the subsequent welding integration efficiency.

[0037] Correspondingly, the thickening part 1012 in the present application can increase the thickness around the accommodation holes 1011, and make the thickened area have a racetrack-shaped structure, which can not only meet the requirements of strengthening the structural uniformity and strength, but also avoid material waste, saving the manufacturing cost and the weight of the light aluminum plate 101.

[0038] Optionally, the outer contour of the thickening portion 1012 in the present application may also be rectangular, and the dimension B of the thickening portion 1012 in the width direction of the light aluminum plate 101 is the same as the width of the light aluminum plate 101.

[0039] By making the dimension of the thickening portion 1012 in the width direction of the light aluminum plate 101 the same as the width of the light aluminum plate 101, the process of forming the thickening portion 1012 can be made simpler, thereby improving the manufacturing efficiency to a certain extent.

[0040] Preferably, the preset thickness value of the thickening portion 1012 in the present application is W2, and the designed thickness value of the light aluminum plate 101 is W1, satisfying 0.01 ≤ W2 - W1 ≤ 0.07.

[0041] Further preferably, taking the thickness reference of the light aluminum plate 101 as 2 mm, the designed thickness value of the light aluminum plate 101 is W3, and the preset thickness value of the thickening portion 1012 is W4, satisfying 0.01 (W3 / W1) ≤ W4 - W3 ≤ 0.07 (W3 / W1).

[0042] It should be supplemented and explained here that the thickness reference of the light aluminum plate 101 in the present application is 2 mm ± 0.05 mm.

[0043]

[0044] Taking the thickness reference of the light aluminum plate 101 as 2 mm ± 0.05 mm and conducting the above tests, as shown in the above table: In Examples 1 and 2, special designs were both carried out. Therefore, the detected thickness values of the preset influence zone were 1.91 and 1.90, and the difference from the reference 2 mm exceeded 0.05 mm. Although in Examples 1 and 2, the detected thickness values outside the preset influence zone were 2.02 mm and 1.99 mm respectively, which met the range, since the thickness within the influence zone was not within the range, the thickness of the cover plate mechanism 1 was locally unqualified.

[0045] In Examples 3 and 4, the difference between A - a was lower than the lower limit of the range, while W2 - W1 was within the range. Therefore, the thickness values within the preset influence zone all met the range requirements, but there were cases where the thickness outside the preset influence zone was lower than the lower limit of the range, making the range of the preset influence zone smaller and there were also some unqualified thickness cases outside the range.

[0046] In Examples 5 - 6, the difference between A - a was within the limited range, and at the same time W2 - W1 was also within the range, but the difference range was small (0.01 - 0.03). Therefore, there were unqualified cases for both the thickness values within the preset influence zone and the thickness values outside the influence zone.

[0047] Accordingly, in Embodiments 7-8, the difference between A and a is within the defined range, and at the same time, W2 - W1 is also within the range, and the difference range is reasonable (0.1 - 0.06). Therefore, whether it is the thickness within the influence area or the thickness outside the influence area, there are no unqualified situations, making the thickness of the cover plate mechanism 1 qualified.

[0048] In Embodiments 9-10, the difference between A and a is within the range, but the upper limit of the range of W2 - W1 exceeds the established upper limit, resulting in an increase in the thickness value, and there is a situation where the thickness of the cover plate mechanism 1 locally exceeds the upper limit near the accommodation hole 1011.

[0049] In Embodiments 11-12, the range of W2 - W1 is restored to within the range, and the difference range is made reasonable, but the difference between A and a exceeds the upper limit of the range, resulting in a too large preset influence area range and a problem of excessive thickness within the influence area.

[0050] It can be understood that the cover plate mechanism 1 provided by the present invention further includes a protective film, and the protective film covers the explosion-proof sheet 102.

[0051] After the explosion-proof sheet 102 is placed in the accommodation hole 1011 and welded, covering the protective film can protect the explosion-proof sheet 102 and avoid problems such as impact damage or failure of the explosion-proof sheet 102.

[0052] Optionally, as Figures 1 - 3 shown, a liquid injection hole 1013 is formed on the light aluminum plate 101 in the present application for injecting electrolyte.

[0053] It can be understood that the cover plate mechanism 1 provided by the present invention further includes an upper plastic and a lower plastic, the upper plastic and the lower plastic are oppositely arranged on both sides of the light aluminum plate 101, and the lower plastic forms an avoidance recess corresponding to the position of the accommodation hole 1011.

[0054] On the one hand, through the avoidance recess formed by the lower plastic, when the light aluminum plate 101 and the lower plastic are assembled, it can provide an accommodation basis for the position of the accommodation hole 1011 of the light aluminum plate 101. On the other hand, the avoidance recess is formed with a hollow hole, which can facilitate the flow of gas generated in the housing 3, thereby triggering the explosion-proof valve.

[0055] Optionally, a liquid passing hole is formed on the lower plastic corresponding to the position of the liquid injection hole 1013 in the present application.

[0056] The center of the liquid passing hole and the center of the liquid injection hole 1013 are collinear, so as to facilitate the injection of electrolyte.

[0057] In addition, the present invention further provides a battery, including a pole group 2, a housing 3, and the above-mentioned cover plate mechanism 1; the cover plate mechanism 1 seals the open end of the housing 3 and forms an accommodation space with the housing 3, and the pole group 2 is arranged in the accommodation space.

[0058] The battery adopting the cover plate mechanism 1 provided by the present application has a more uniform and stable explosion-proof valve structure, thereby avoiding the problem of the explosion-proof valve failing under mechanical impact or the like due to inconsistent thickness, and improving the use safety of the overall battery.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cover plate mechanism, characterized in that, It includes a light aluminum plate (101) and an explosion-proof sheet (102); A receiving hole (1011) is formed on the light aluminum plate (101), the explosion-proof sheet (102) is arranged in the receiving hole (1011), and a thickening part (1012) is formed at the edge position of the light aluminum plate (101) around the receiving hole (1011); The size of the receiving hole (1011) in the length direction of the light aluminum plate (101) is a, the size of the thickening part (1012) in the length direction of the light aluminum plate (101) is A, the size of the receiving hole (1011) in the width direction of the light aluminum plate (101) is b, and the size of the thickening part (1012) in the width direction of the light aluminum plate (101) is B, satisfying 3mm ≤ A - a = B - b ≤ 5mm, and the thickness of the thickening part (1012) gradually decreases from the position close to the receiving hole (1011) to the position far from the receiving hole (1011).

2. The cover plate mechanism according to claim 1, characterized in that, The receiving hole (1011) is waist-shaped, and the thickening part (1012) is formed around the circumference of the receiving hole (1011) and forms a runway-shaped structure.

3. The cover plate mechanism according to claim 1, wherein The outer contour of the thickening part (1012) is rectangular, and the size B of the thickening part (1012) in the width direction of the light aluminum plate (101) is the same as the width of the light aluminum plate (101).

4. The cover plate mechanism according to claim 1, wherein The preset thickness value of the thickening part (1012) is W2, and the designed thickness value of the light aluminum plate (101) is W1, satisfying 0.01 ≤ W2 - W1 ≤ 0.

07.

5. The cover plate mechanism according to claim 4, wherein If the thickness reference of the light aluminum plate (101) is 2mm ± 0.05mm, then the designed thickness value of the light aluminum plate (101) is W3, and the preset thickness value of the thickening part (1012) is W4, satisfying 0.01 (W3 / W1) ≤ W4 - W3 ≤ 0.07 (W3 / W1).

6. The cover plate mechanism according to claim 1, characterized in that, It further includes a protective film, and the protective film covers the explosion-proof sheet (102).

7. The cover plate mechanism according to claim 1, characterized in that, A liquid injection hole (1013) is formed on the light aluminum plate (101) for injecting electrolyte.

8. The cover plate mechanism according to claim 7, characterized in that, It further includes an upper plastic and a lower plastic, the upper plastic and the lower plastic are oppositely arranged on both sides of the light aluminum plate (101), and a relief recess is formed at the position of the lower plastic corresponding to the receiving hole (1011).

9. The cover plate mechanism according to claim 8, characterized in that, A liquid passing hole is formed at the position of the lower plastic corresponding to the liquid injection hole (1013).

10. A battery, characterized in that, It includes a pole group (2), a housing (3), and the cover plate mechanism (1) according to any one of claims 1 - 9 above; The cover plate mechanism (1) seals the open mouth of the housing (3) and forms a receiving space with the housing (3), and the pole group (2) is arranged in the receiving space.

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