Battery cover plate, battery monomer and electric equipment

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery cover plate, a battery monomer and electric equipment, the battery cover plate comprises a body which is provided with a first side along the thickness direction; the turnup is annular and is arranged on the first side of the body; the turnup is connected with the body, and the turnup is configured to be foldable relative to the body. According to the battery cover plate, the battery monomer and the electric equipment provided by the utility model, the area of the battery cover plate can be changed through folding after being processed; and the required tab is short, so that the space utilization rate is improved, and the process difficulty, the material cost and the internal resistance of the battery are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially relates to a battery cover plate, battery monomer and electric equipment. BACKGROUND

[0002] The blade battery is more and more widely used due to the convenience from the electrode assembly to the system assembly. Corresponding to the double-opening structure, the blade battery is provided with left and right two cover plates to cooperate with the shell to package the electrode assembly.

[0003] After the electrode assembly enters the shell, due to the block of the shell, the cover plate of the rear package needs to be connected with the electrode assembly, so the electrode assembly needs to be configured with a longer tab. However, the longer tab is easy to roll up at the edge during the manufacturing, which leads to the increase of the process difficulty; and the longer tab leads to the increase of the volume of the electrode assembly, so the shell needs to be increased to have enough space to accommodate the electrode assembly, which leads to the increase of the material cost and the decrease of the space utilization; and the longer tab also increases the path of the current conduction, which leads to the increase of the battery internal resistance and the decrease of the charge and discharge efficiency.

[0004] At present, there is no effective solution to the problem of the longer tab of the blade battery in the related technology. SUMMARY

[0005] The battery cover plate, the battery monomer and the electric equipment provided by the embodiment of the utility model solve at least the problem of the longer tab of the blade battery.

[0006] The battery cover plate provided by the embodiment of the utility model comprises a body 201 having a first side in the thickness direction; a flange 202 in the shape of a ring is arranged on the first side of the body 201; the flange 202 is connected with the body 201, wherein the flange 202 is configured to be foldable relative to the body 201.

[0007] The battery cover plate provided by the embodiment of the utility model is integrally formed with the body 201; and / or a crack stopping groove 500 is arranged at the connection part of the flange 202 and the body 201.

[0008] The battery cover plate provided by the embodiment of the utility model comprises four straight sections and a curved section connected between adjacent straight sections, the thickness of the straight section is b, the thickness of the middle position of the curved section is c, and b < c ≤ 2b.

[0009] This utility model provides a battery cell comprising: a first cover plate; a second cover plate comprising a body 201 and an annular flange 202, the flange 202 being connected to the body 201; the flange 202 being foldable relative to the body 201; a housing 100 having a receiving cavity having a first opening and a second opening, the first opening and the second opening being disposed opposite to each other along a first direction X; the first cover plate covering the first opening and being connected to the housing 100; the flange 202 of the second cover plate covering the second opening and being connected to the housing 100.

[0010] The battery cell provided in this embodiment of the utility model has the flange 202 and the body 201 integrally formed; and / or, the connection between the flange 202 and the body 201 is provided with a crack-prevention groove 500.

[0011] The battery cell provided in this embodiment of the present invention has a second cover plate body 201 at least partially housed in the receiving cavity, and there is a gap between the second cover plate body 201 and the cavity wall of the housing 100, the size of the gap being a, 0.5mm≤a≤1.5mm; and / or, the size of the gap being a, the thickness of the body being e, and the thickness of the flange being b, 0.5a≤b≤1.5a, 0.3e≤b≤0.7e.

[0012] In the battery cell provided in this embodiment of the present invention, one end of the flange 202 of the second cover plate away from the body 201 is located in the receiving cavity, and the flange 202 of the second cover plate is welded to the housing 100; or, the housing 100 has a first end face disposed at the second opening, the flange 202 of the second cover plate is in contact with the first end face of the housing 100, and the flange 202 of the second cover plate is welded to the housing 100.

[0013] The battery cell provided in this embodiment of the present invention further includes: an electrode assembly located in the receiving cavity; an insulating film 300 covering the outer periphery of the electrode assembly; the insulating film 300 includes an extension portion covering the outer periphery of the body 201 of the second cover plate.

[0014] The battery cell provided in this embodiment of the present invention has an extension portion with a dimension d along the first direction (X), where 0.5mm≤d≤2mm.

[0015] An embodiment of this utility model provides an electrical device comprising any of the aforementioned battery cells.

[0016] The utility model discloses a battery cover plate, battery monomer and electric equipment, solve the problem that the pole ear of blade battery is longer, reached the technical effect of reducing process difficulty, material cost and battery internal resistance. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0018] Figure 1 It is the structural schematic diagram of battery cover plate in the utility model embodiment one.

[0019] Figure 2 It is Figure 1 The angle alpha of the flanging 202 of the battery cover plate and the body 201.

[0020] Figure 3 It is Figure 1 The battery cover plate is provided with the schematic diagram of the crack stop groove 500.

[0021] Figure 4 It is Figure 1 The battery cover plate is provided with the schematic diagram of the crack stop groove 500.

[0022] Figure 5 It is Figure 4 The enlarged schematic diagram of the flat section 2021 and the curved section 2022.

[0023] Figure 6 It is the structural schematic diagram of battery monomer in the utility model embodiment.

[0024] Figure 7 It is the angle beta of the flanging 202 of the second cover plate and the body 201.

[0025] Figure 8 It is the schematic diagram that the second cover plate is provided with the crack stop groove 500 in the utility model embodiment.

[0026] Figure 9 It is the schematic diagram that the inner annular surface of the flanging 202 of the second cover plate is projected to the surface of the first side of the body 201.

[0027] Figure 10 It is Figure 9 The flanging 202 of the second cover plate has not been folded over.

[0028] Figure 11 It is the schematic diagram that the outer annular surface of the flanging 202 of the second cover plate contacts the first end surface of the shell 100 in the utility model embodiment.

[0029] Figure 12 is Figure 11 is a schematic view of the second cover plate of which the flange 202 has not been folded yet.

[0030] Figure 13 is a schematic view of the electrode assembly of which the electrode assembly has not been assembled into the shell.

[0031] Among them, the above-mentioned drawings include the following reference signs:

[0032] 100 - shell; X - first direction;

[0033] 201 - body; 202 - flange; 2021 - straight section; 2022 - curved section;

[0034] 300 - insulating film; 400 - lower insulating piece; 500 - crack stopping groove. DETAILED DESCRIPTION

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the application. At the same time, it should be understood that, for the convenience of description, the sizes of various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] Embodiment one

[0039] The area size of the existing cover plate cannot be changed after processing, so that the use scene of the cover plate is limited and the use mode is single; and due to the existence of processing error, the cover plate cannot be tightly closed when being closed on the shell, and then laser welding is performed in the case that there is a gap between the cover plate and the shell, so that there is a risk of burning the electrode assembly inside the shell.

[0040] Therefore, the utility model embodiment provides a battery cover plate.

[0041] Figures 1 to 5 All are battery cover plate structures without being folded and welded with the shell.

[0042] The utility model embodiment provides a battery cover plate, comprising: a body 201 having a first side in the thickness direction thereof; a folded edge 202 in the shape of a ring, arranged on the first side of the body 201; the folded edge 202 and the body 201 are connected, wherein the folded edge 202 is configured to be foldable relative to the body 201.

[0043] It can be understood that the folded edge 202 can be folded relative to the body 201, that is, by folding the folded edge 202, the area of the body 201 on the projection plane can be increased, wherein the projection plane and the thickness direction of the body 201 are perpendicular to each other. The included angle between the folded edge 202 and the body 201 is α, please refer to Figure 2 , 0° < α < 180°, preferably 60° ≤ α ≤ 120°, specifically, the value of α can be 90° or 95° or 85° or 80° or 100°.

[0044] In this embodiment, the battery cover plate structure is simple and convenient to manufacture, and by designing the folded edge 202 to be foldable relative to the body 201, the area size of the battery cover plate can be changed according to the use needs, thereby being more flexible to use and having more application scenes.

[0045] It should be noted that the battery cover plate is also provided with a mounting hole for mounting a pole, a liquid injection hole for electrolyte to pass through, and an explosion-proof through hole for mounting an explosion-proof valve.

[0046] In some embodiments, referring to Figure 4 and Figure 5 , the folded edge 202 is in the shape of a rectangular ring and has four straight sections 2021 and curved sections 2022 connected between adjacent straight sections.

[0047] By providing the curved sections, on the one hand, the battery cover plate can avoid accidentally hurting the operator, and on the other hand, the stress concentration can be reduced, thereby improving the strength of the battery cover plate. It should be noted that the inner circumferential surface radius of the curved section can be 0.5mm or 1mm or 1.5mm or 2mm or 2.5mm.

[0048] It should be noted that in other embodiments, the flange 202 can be a circular ring or a regular hexagonal ring.

[0049] Further, in order to facilitate the folding of the flange 202, the thickness of the flange 202 is designed to be smaller than the thickness of the body 201. Specifically, the thickness of the body 201 is between 1.5mm and 3mm, and the thickness of the flat section of the flange 202 is 30%-70% of the thickness of the body 201.

[0050] For example, the thickness of the body 201 can be 1.5mm or 1.7mm or 2mm or 2.5mm or 3mm; the thickness of the flat section of the flange 202 is 30% or 35% or 40% or 45% or 50% or 55% or 60% or 65% or 70% of the thickness of the body 201.

[0051] Further, considering that the thickness of the curved section of the flange 202 becomes smaller after folding, and also considering avoiding material waste, the thickness of the flat section is b, and the thickness of the curved section at the middle position is c, b

[0052] It can be understood that the distance between the middle position of the curved section and the two adjacent flat sections is equal.

[0053] Since the thickness of the curved section after folding is smaller than that before folding, in order to ensure that the thickness of the curved section after folding is not thinner than the thickness of the flat section, b

[0054] In some embodiments, in order to improve the fatigue strength of the flange 202 relative to the body 201 after folding, and to simplify the sealing connection between the flange 202 and the body 201, the flange 202 and the body 201 are integrally formed.

[0055] It should be noted that there are many ways to integrally form, one is that the flange 202 and the body 201 are obtained by stamping and stretching a whole plate; another is that the flange 202 and the body 201 are obtained by milling a whole plate, and the specific processing method is determined according to the design.

[0056] In some embodiments, in order to consider the folding difficulty of the flange 202 relative to the body 201, a crack stopping groove 500 is arranged at the connection between the flange 202 and the body 201, please refer to Figure 3 The arrangement of the crack stopping groove 500 can make the folding process of the flange 202 easier on the one hand, and on the other hand, it can make the material stretch along the direction of the crack stopping groove 500 during the folding process, avoiding cracks at the joint between the flange 202 and the body 201, which can cause material tearing and deformation.

[0057] Specifically, the annular flange 202 has an inner annular surface and an outer annular surface oppositely arranged along the thickness direction thereof, the body 201 has a first side along the thickness direction thereof, the body 201 has a peripheral side surface, the inner annular surface of the flange 202 and the surface at the first side of the body 201 are connected, and the included angle a between the inner annular surface of the flange 202 and the surface at the first side of the body 201 is 90°, the outer annular surface of the flange 202 and the peripheral side surface of the body 201 are connected, and the outer annular surface of the flange 202 and the peripheral side surface of the body 201 are flushly arranged; wherein the crack arrest groove 500 is formed at the connection between the inner annular surface of the flange 202 and the body 201; or the crack arrest groove 500 is formed at the connection between the outer annular surface of the flange 202 and the body 201.

[0058] It should be noted that the crack arrest groove 500 can be continuously extended along the periphery of the body 201, or can be discontinuously extended along the periphery of the body 201.

[0059] It should be further noted that the cross-sectional shape of the crack arrest groove 500 can be various, such as V-shaped, U-shaped, semicircular, trapezoidal or rectangular.

[0060] Embodiment Two

[0061] After the electrode assembly of the blade battery is put into the shell, due to the blockage of the shell, the cover plate of the rear package needs to be connected with the electrode assembly, so the electrode assembly needs to be configured with a longer tab.

[0062] However, the longer tab is prone to edge curling during manufacturing, which increases the process difficulty; the longer tab also increases the volume of the electrode assembly, so the shell needs to be increased to have enough space to accommodate the electrode assembly, which increases the material cost and reduces the space utilization; and the longer tab also increases the current conduction path, which increases the battery internal resistance and reduces the charging and discharging efficiency.

[0063] To solve the above problems, the battery cover plate disclosed in Embodiment One is applied to the battery monomer in this embodiment, so that the electrode assembly and the battery cover plate are connected and then put into the shell together, thereby shortening the length of the tab, reducing the manufacturing cost, and improving the use of the internal space of the shell, as shown in Figure 6 The second cover plate is the folded battery cover plate of Embodiment One.

[0064] The battery cell provided in the embodiment comprises an electrode assembly, a first cover plate assembly, a second cover plate assembly, a shell 100 and an insulation film 300, the first cover plate assembly comprises a first cover plate and a first pole arranged on the first cover plate, the second cover plate assembly comprises the battery cover plate of the first embodiment and a second pole arranged on the battery cover plate, the shell 100 has two openings arranged oppositely along the first direction X, the two openings are respectively a first opening and a second opening, the size of the first opening is the same as the size of the second opening; the electrode assembly has a first tab and a second tab arranged oppositely along the first direction X.

[0065] In this way, the assembly sequence of the battery cell is as follows: first, the first tab of the electrode assembly and the first pole of the first cover plate assembly are electrically connected, and the second tab of the electrode assembly and the second pole of the second cover plate assembly are electrically connected, at this time, the second cover plate assembly comprises the battery cover plate of the first embodiment, i.e. the second cover plate before being folded; second, the insulation film is wrapped around the electrode assembly, so that the electrode assembly, the first cover plate assembly, the second cover plate assembly and the insulation film are connected into an integral structure; third, the above integral structure is sequentially pushed into the shell 100 from the first opening of the shell 100 in the order of the second cover plate assembly-electrode assembly-first cover plate assembly, please refer to Figure 13 In this way, the assembly sequence of the battery cell is as follows: first, the first tab of the electrode assembly and the first pole of the first cover plate assembly are electrically connected, and the second tab of the electrode assembly and the second pole of the second cover plate assembly are electrically connected, at this time, the second cover plate assembly comprises the battery cover plate of the first embodiment, i.e. the second cover plate before being folded; second, the insulation film is wrapped around the electrode assembly, so that the electrode assembly, the first cover plate assembly, the second cover plate assembly and the insulation film are connected into an integral structure; third, the above integral structure is sequentially pushed into the shell 100 from the first opening of the shell 100 in the order of the second cover plate assembly-electrode assembly-first cover plate assembly, please refer to

[0066] In this embodiment, since the electrode assembly is loaded into the shell 100 after being connected with the first cover plate assembly and the second cover plate assembly, the length of the tab can be shortened, the manufacturing cost can be reduced, and the space occupied by the electrode assembly in the shell can be maximized, thereby improving the energy density.

[0067] It should be noted that the folding of the folded edge 202 can be rolling, flattening or spinning.

[0068] The battery cell assembled by the above steps 1-6 is described below.

[0069] The battery cell of the embodiment comprises an electrode assembly, a first cover plate assembly, a second cover plate assembly and a shell 100, the shell 100 has a first opening and a second opening arranged oppositely along a first direction X, the first cover plate assembly comprises a first cover plate, the first cover plate covers the first opening, and the first cover plate is connected with the shell 100; the second cover plate assembly comprises a second cover plate, the second cover plate comprises a body 201 and a ring-shaped flange 202, the flange 202 is connected to the body 201, and the flange 202 is foldable relative to the body 201; the second cover plate covers the second opening, and the flange 202 of the second cover plate is connected with the shell 100.

[0070] It should be noted that in the second cover plate, the included angle between the flange 202 and the body 201 is β, as shown in Figure 8 The included angle between the flange 202 and the body 201 in the battery cover plate of the first embodiment is α, and α < β, wherein 90° < β ≤ 180°, and specifically, the value of β can be 120° or 130° or 140° or 150° or 160° or 170° or 180°.

[0071] As shown in Figure 8 In some embodiments, a crack stop groove 500 is arranged at the connection between the flange 202 and the body 201 of the second cover plate. As shown in Figures 9 to 12 In some embodiments, the body 201 of the second cover plate is at least partially accommodated in the accommodating cavity, and there is a gap between the body 201 of the second cover plate and the cavity wall of the shell 100, and the size of the gap is a, 0.5mm ≤ a ≤ 1.5mm.

[0072] It can be understood that the body 201 of the second cover plate can be partially accommodated in the accommodating cavity, or the body 201 of the second cover plate can be entirely accommodated in the accommodating cavity. There is a gap between the peripheral side surface of the body 201 of the second cover plate and the cavity wall of the shell 100.

[0073] By designing the gap between the body 201 of the second cover plate and the cavity wall of the shell 100, it is ensured that the battery cover plate of the first embodiment can enter the shell 100 from the first opening; considering that the purpose of the flange 202 is to connect the body 201 and the shell 100, if the gap is too small, accordingly, the length of the flange 202 will also be too small, so that it is not conducive to the flange processing of the flange 202, and it will cause the battery cover plate of the first embodiment to be difficult to enter the shell 100, and if the gap is too large, accordingly, the length of the flange 202 will also be too large, so that the structural strength of the connection between the flange and the shell 100 is weakened, therefore, the size a of the gap is designed to be between 0.5mm and 1.5mm, so that not only is it convenient for the flange 202 to be folded relative to the body 201, but also it is convenient for the battery cover plate of the first embodiment to enter the shell 100, and the structural strength of the connection between the flange and the shell 100 is ensured.

[0074] Referring to Figure 9 and Figure 11 In some embodiments, the thickness b of the flange 202 and the size of the gap a are related, that is, when the gap a becomes larger, the thickness b of the flange 202 should also be increased accordingly, so as to ensure the structural strength of the connection between the flange 202 and the shell 100, and therefore, 0.5a≤b≤1.5a is designed; since the thickness b of the flange 202 also relates to the ease of folding of the body 201, therefore, 0.3e≤b≤0.7e is designed, e is the thickness of the body 201.

[0075] wherein, when the value range of e is between 1.5mm to 3mm, the maximum value range of b is between 0.45mm to 2.1mm; and when the value range of a is between 0.5mm to 1.5mm, the maximum value range of b is between 0.25mm to 2.25mm; since the value of b needs to meet between 0.45mm to 2.1mm while meeting between 0.25mm to 2.25mm, the maximum value range of b is 0.45mm to 2.1mm.

[0076] For example, when e is 2mm, the maximum value range of b is between 0.6mm to 1.4mm; and when a is 1mm, the maximum value range of b is between 0.5mm to 1.5mm; since the value of b needs to meet between 0.6mm to 1.4mm while meeting between 0.5mm to 1.5mm, the maximum value range of b is between 0.6mm to 1.4mm, specifically, b can be 0.6mm or 0.8mm or 1mm or 1.2mm or 1.3mm or 1.4mm.

[0077] Referring to Figure 11 and Figure 12 In some embodiments, the flange 202 of the second cover plate is located in the accommodating cavity away from one end of the body 201, and the flange 202 of the second cover plate and the shell 100 are welded.

[0078] It can be understood that the inner annular surface of the flange 202 of the second cover plate is flush with the surface at the first side of the body 201.

[0079] By embedding the second cover plate in the shell 100, positioning is achieved, and laser welding is facilitated.

[0080] In other embodiments, the shell 100 has a first end surface arranged at the second opening, the flange 202 of the second cover plate contacts the first end surface of the shell 100, and the flange 202 of the second cover plate and the shell 100 are welded.

[0081] It can be understood that the outer annular surface of the flange 202 of the second cover plate contacts the first end surface, referring to Figure 8The inner annular surface of the flange 202 of the second cover plate and the surface at the first side of the body 201 are flushly arranged, or the inner annular surface of the flange 202 of the second cover plate protrudes from the surface at the first side of the body 201, see Figure 9 as shown.

[0082] As shown. Figures 7 to 12 In some embodiments, in order to avoid the battery cover plate of embodiment one from being scratched with the cavity wall of the shell 100 when the battery cover plate enters the shell 100, and thus causing metal debris inside the shell 100, the insulating film 300 is designed to include a main body part and an extension part, the extension part is formed by extending the main body part along the first direction, the main body part covers the outer periphery of the electrode assembly, and the main body part extends along the first direction to have the extension part, and the extension part covers the outer periphery of the body 201.

[0083] By covering the outer periphery of the body 201 with the extension part of the insulating film 300, the battery cover plate of embodiment one is protected, and thus the battery cover plate of embodiment one is prevented from being scratched with the shell 100.

[0084] It should be noted that the second cover plate assembly further includes a lower insulating part 400, the lower insulating part 400 is located between the electrode assembly and the second cover plate, and the lower insulating part is connected to the second cover plate, wherein the insulating film 300 is connected to the lower insulating part by means of heat melting.

[0085] Further, if the extension part of the insulating film 300 is too far away from the first end surface of the shell 100, it is not sufficient to prevent the battery cover plate of embodiment one from being scratched with the shell 100, and if the extension part of the insulating film 300 exceeds the first end surface of the shell 100, it will affect the appearance, therefore, the dimension of the extension part along the first direction X is designed to be d, the body 201 has a second side arranged away from the first side along the thickness direction of the body 201, the distance between the surface at the second side of the body 201 and the first end surface of the shell 100 is f, and 0.5mm≤d≤f, preferably, 0.5mm≤d≤2mm.

[0086] It can be understood that the distance f between the surface at the second side of the body 201 and the first end surface of the shell 100 can be equal to the thickness of the body 201, i.e. f is between 1.5mm and 3mm; of course, the distance f between the surface at the second side of the body 201 and the first end surface of the shell 100 can also be greater than the minimum thickness of the body 201, see Figure 9 as shown.

[0087] The utility model embodiment further provides a kind of electric equipment, and the electric equipment includes above-mentioned battery monomer, therefore, the electric equipment includes all technical effects of above-mentioned battery monomer. Since the technical effect of above-mentioned battery monomer has been described in detail in the foregoing, it will not be repeated here.

[0088] Embodiment three

[0089] The basic structure of the battery cell of the embodiment is the same as that of embodiment two, except that the first cover plate and the second cover plate are the folded battery cover plates of embodiment one.

[0090] The embodiment provides a battery cell, which comprises an electrode assembly, a first cover plate assembly, a second cover plate assembly, a shell 100 and an insulation film 300, the first cover plate assembly comprises the battery cover plate of embodiment one and the first pole provided on the battery cover plate, the second cover plate assembly comprises the battery cover plate of embodiment one and the second pole provided on the battery cover plate; the shell 100 has two openings oppositely arranged along the first direction X, the two openings are respectively a first opening and a second opening, and the size of the first opening is the same as that of the second opening; the electrode assembly has a first tab and a second tab oppositely arranged along the first direction X.

[0091] In this way, the assembly sequence of the battery cell is as follows: first, the first tab of the electrode assembly and the first pole of the first cover plate assembly are electrically connected, and the second tab of the electrode assembly and the second pole of the second cover plate assembly are electrically connected, at this time, the second cover plate assembly and the first cover plate assembly both comprise the battery cover plate of embodiment one; second, the insulation film is wrapped around the electrode assembly, so that the electrode assembly, the first cover plate assembly, the second cover plate assembly and the insulation film are connected into an integral structure; third, the above integral structure is sequentially arranged in the order of the second cover plate assembly-electrode assembly-first cover plate assembly and sequentially enters the inside of the shell 100 from the first opening of the shell 100, or the above integral structure is sequentially arranged in the order of the first cover plate assembly-electrode assembly-second cover plate assembly and sequentially enters the inside of the shell 100 from the first opening of the shell 100; fourth, the above integral structure is continuously pushed into the shell 100 until the folded edge 202 of the battery cover plate of the cover plate assembly arranged in the front sequence exposes the second opening; fifth, the folded edge 202 is folded relative to the body 201, that is, the battery cover plate of embodiment one in the first cover plate assembly is folded to obtain the first cover plate, and the battery cover plate of embodiment one in the second cover plate assembly is folded to obtain the second cover plate; sixth, the folded edge 202 of the second cover plate is welded to the shell 100 to seal the second opening, and the folded edge 202 of the first cover plate is welded to the shell 100 to seal the first opening, or the folded edge 202 of the first cover plate is welded to the shell 100 to seal the second opening, and the folded edge 202 of the second cover plate is welded to the shell 100 to seal the first opening.

[0092] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof (e.g., "vertical ly", "horizontal ly", etc.) can refer to the relative positions of an apparatus or feature as shown in the drawings, and shall not be construed as limiting the present application to any particular spatial orientation. Terms concerning attachments, coupling and the like, such as "connected", "attached", "supported", and the like, can have the ordinary and accustomed meanings as understood by those skilled in the art. For example, "connected" can mean directly connected or indirectly connected through one or more intervening elements or features. Such terminology does not exclude the introduction of intermediate elements or features. Such terminology does not exclude the inclusion of topological equivalents of a recited element or equivalent structural arrangements. Such terminology does not exclude the use of other elements in between recited elements or intervening elements. Such terminology does not exclude that multiple elements can be connected to a single element.

[0093] In addition, it should be pointed out that the use of "first", "second" and the like words to qualify parts, is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0094] The preferred embodiments of the present application are shown and described above. However, the present application can be modified and changed in various ways by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery cover plate, characterized by, Comprising: a body (201) having a first side in a thickness direction thereof; a ring-shaped flange (202) disposed on the first side of the body (201); the flange (202) and the body (201) are connected, wherein the flange (202) is configured to be foldable relative to the body (201).

2. The battery cover plate of claim 1, wherein, The flange (202) and the body (201) are integrally formed; and / or, a crack arrest groove (500) is disposed at the connection between the flange (202) and the body (201).

3. The battery cover plate of claim 1, wherein, The flange (202) has four straight segments and curved segments connected between adjacent straight segments, the thickness of the straight segments is b, the thickness of the middle position of the curved segments is c, b < c ≤ 2b.

4. A battery cell characterized by, Comprising: a first cover plate; a second cover plate comprising a body (201) and a ring-shaped flange (202) connected to the body (201), the flange (202) being foldable relative to the body (201); a shell (100) formed with a receiving cavity having a first opening and a second opening, the first opening and the second opening being oppositely disposed along a first direction (X); the first cover plate covers the first opening, and the first cover plate is connected with the shell (100); the flange (202) of the second cover plate covers the second opening, and the flange (202) of the second cover plate is connected with the shell (100).

5. The battery cell of claim 4, wherein, The flange (202) and the body (201) are integrally formed; and / or, a crack arrest groove (500) is disposed at the connection between the flange (202) and the body (201).

6. The battery cell of claim 4, wherein, The body (201) of the second cover plate is at least partially accommodated in the receiving cavity, and there is a gap between the body (201) of the second cover plate and the cavity wall of the shell (100), the size of the gap is a, 0.5mm ≤ a ≤ 1.5mm; and / or, the size of the gap is a, the thickness of the body (201) is e, the thickness of the flange (202) is b, 0.5a ≤ b ≤ 1.5a, 0.3e ≤ b ≤ 0.7e.

7. The battery cell of claim 4, wherein, The end of the flange (202) of the second cover plate away from the body (201) is located in the receiving cavity, and the flange (202) of the second cover plate and the shell (100) are welded; or, the shell (100) has a first end face disposed at the second opening, the flange (202) of the second cover plate and the first end face of the shell (100) are in contact, and the flange (202) of the second cover plate and the shell (100) are welded.

8. The battery cell of claim 4, wherein, Further comprising: an electrode assembly located in the receiving cavity; an insulating film (300) covering the outer periphery of the electrode assembly; the insulating film (300) comprises an extension portion covering the outer periphery of the body (201) of the second cover plate.

9. The battery cell of claim 8, wherein, The size of the extension portion along the first direction (X) is d, 0.5mm ≤ d ≤ 2mm.

10. An electric device, characterized by A battery cell comprising any one of claims 4 to 9.

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