Battery shell, battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a battery shell, a battery monomer, a battery and electric equipment, the battery shell comprises a bottom surface and a side surface, an edge is formed at the junction of the bottom surface and the side surface, the edge comprises an auxiliary area and a middle area which are positioned at two ends, and the distance from the auxiliary area to the bottom surface is smaller than the distance from the middle area to the bottom surface. It can be seen that the battery shell comprises the bottom face and the side face, the edge is formed at the junction of the bottom face and the side face and comprises the auxiliary areas located at the two ends and the middle area, and the distance between the auxiliary areas and the bottom face is smaller than that between the middle area and the bottom face, so that in the film wrapping process, a pressing roller makes contact with the auxiliary areas with the low edge height firstly, and then the edge is pressed; therefore, the insulating films on the two sides cannot be folded towards the middle, wrinkles are avoided, and the battery shell provided by the utility model can obviously solve the problem of poor appearance such as wrinkles of the film and the like, and the yield of lithium batteries during production is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery housing, a battery cell, a battery and an electrical device. Background Art

[0002] At present, with the widespread application of batteries in the new energy industry, the manufacturing quality rate of batteries has become a key indicator in the industry. Figures 1 to 3 As shown, an insulating film 6 is usually used to wrap the battery shell 5 to play an insulating and protective role. Currently, a commonly used U-shaped wrapping method in the industry is to wrap from the bottom of the shell. Since the flatness of the bottom contour of the shell cannot be fully guaranteed, when wrapping the shell with the insulating film 6, the shell contour is usually uneven, resulting in different local forces on the insulating film 6, which may eventually cause wrinkles and affect the appearance of the battery.

[0003] At present, the industry usually grinds the aluminum shell and adjusts the roller of the coating equipment for repeated film application. The corresponding disadvantage is that it greatly affects the production efficiency of the production line and consumes a lot of manpower. Utility Model Content

[0004] The purpose of the present application is to provide a battery casing, a battery cell, a battery and an electrical device, which to a certain extent solves the problem that the battery casing in the prior art will be wrinkled during the process of wrapping the U-shaped film. Currently, the problem can only be solved by grinding the aluminum shell or re-pasting the film, but the above methods are inefficient and consume a lot of manpower.

[0005] The present application provides a battery shell, comprising a bottom surface and a side surface, wherein an edge is formed at the junction of the bottom surface and the side surface, and the edge includes an auxiliary area and a middle area located at both ends, and the distance from the auxiliary area to the bottom surface is smaller than the distance from the middle area to the bottom surface.

[0006] In the above technical solution, further, the side surface and the bottom surface are connected by an arc, and the arc is tangent to the bottom surface.

[0007] In any of the above technical solutions, further, the distance between the center of the auxiliary area and the side surface is smaller than the distance between the center of the middle area and the side surface, and the distance between the center of the auxiliary area and the bottom surface is equal to the distance between the center of the middle area and the bottom surface.

[0008] In any of the above technical solutions, further, the distance between the center of the auxiliary area and the side surface is smaller than the distance between the center of the middle area and the side surface, and the distance between the center of the auxiliary area and the bottom surface is smaller than the distance between the center of the middle area and the bottom surface.

[0009] In any of the above technical solutions, further, the distance between the center of the auxiliary area and the side surface is equal to the distance between the center of the middle area and the side surface, and the distance between the center of the auxiliary area and the bottom surface is equal to the distance between the center of the middle area and the bottom surface.

[0010] In any of the above technical solutions, further, the distance between the center of the auxiliary area and the bottom surface is greater than the distance between the center of the middle area and the bottom surface, and the distance between the center of the auxiliary area and the side surface is equal to the distance between the center of the middle area and the side surface.

[0011] In any of the above technical solutions, further, the distance between the center of the auxiliary area and the bottom surface is greater than the distance between the center of the middle area and the bottom surface, and the distance between the center of the auxiliary area and the side surface is less than the distance between the center of the middle area and the side surface.

[0012] In any of the above technical solutions, further, the difference between the distance between the center of the auxiliary area and the bottom surface and the distance between the center of the middle area and the bottom surface ranges from 0 to 3 mm.

[0013] In any of the above technical solutions, further, the auxiliary area and the shell are provided separately, and the inner side of the auxiliary area is in contact with the shell.

[0014] The present application also provides a battery cell, comprising an insulating film and a battery housing as described in any of the above technical solutions, wherein the insulating film wraps the bottom and side surfaces of the battery housing. Therefore, the battery housing has all the beneficial technical effects, which will not be described in detail here.

[0015] The present application also provides a battery, comprising a battery cell as described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cell, which will not be elaborated here.

[0016] The present application also provides an electrical device, including a battery as described in any of the above technical solutions, and thus has all the beneficial technical effects of the battery, which will not be repeated here.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] The battery shell of the present application includes a bottom surface and a side surface, and an edge is formed at the junction of the bottom surface and the side surface, and the edge includes an auxiliary area and a middle area located at both ends. The distance between the auxiliary area and the bottom surface is smaller than the distance between the middle area and the bottom surface. Therefore, during the coating process, the pressure roller will first contact the auxiliary area, so that the insulating film on both sides will not gather in the middle, thereby avoiding the formation of wrinkles. It can be seen that the battery shell provided by the present application can significantly improve the problem of poor appearance such as coating wrinkles, thereby improving the quality rate of lithium batteries during production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A diagram showing the relative position relationship between the battery housing and the U-shaped membrane when the battery housing is wrapped with the U-shaped membrane provided in the prior art;

[0021] Figure 2 Another relative position relationship diagram of the battery shell and the U-shaped film when the U-shaped film is wrapped in the prior art;

[0022] Figure 3 A process diagram of a U-shaped film for a battery shell provided by the prior art;

[0023] Figure 4 A schematic diagram of the structure of a battery housing provided in an embodiment of the present application;

[0024] Figure 5 Another schematic diagram of the structure of the battery housing provided in the embodiment of the present application;

[0025] Figure 6 A diagram showing the relationship between the auxiliary area and the middle area and the bottom surface and the side surface provided in the embodiment of the present application;

[0026] Figure 7 Another relationship diagram of the auxiliary area and the middle area with the bottom surface and the side surface provided in the embodiment of the present application;

[0027] Figure 8 Another relationship diagram of the auxiliary area and the middle area with the bottom surface and the side surface provided in the embodiment of the present application;

[0028] Fig. 9 Another relationship diagram of the auxiliary area and the middle area with the bottom surface and the side surface provided in the embodiment of the present application;

[0029] Fig.10Another relationship diagram of the auxiliary area and the middle area with the bottom surface and the side surface provided in the embodiment of the present application;

[0030] Fig.11 A schematic diagram of the structure of a battery housing provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of the structure of a correction block provided in an embodiment of the present application;

[0032] Fig.13 This is another schematic diagram of the structure of the battery housing provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 1- bottom surface, 2- side surface, 3- auxiliary area, 4- middle area, 5- battery casing, 6- insulating film. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0037] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Refer to the following Figures 4 to 13 The present invention describes a battery casing, a battery cell, a battery and an electrical device according to some embodiments of the present application.

[0041] Embodiment 1

[0042] See also Figure 4 and Figure 5 As shown, an embodiment of the present application provides a battery shell, which includes a bottom surface 1 and a side surface 2, an edge is formed at the junction of the bottom surface 1 and the side surface 2, and the edge includes an auxiliary area 3 and a middle area 4 located at both ends, and the distance between the auxiliary area 3 and the bottom surface 1 is smaller than the distance between the middle area 4 and the bottom surface 1.

[0043] According to the structure described above, since the distance between the auxiliary areas 3 at both ends of the aforementioned edge and the bottom surface 1 is smaller than the distance between the middle area 4 and the bottom surface 1, during the coating process, the pressure roller will first contact the auxiliary area 3, so that the insulating film on both sides will not gather in the middle, thereby avoiding the formation of wrinkles. It can be seen that the battery shell provided in the present application can significantly improve the problem of poor appearance such as coating wrinkles, thereby improving the quality rate of lithium battery production.

[0044] In this embodiment, preferably, Figure 4 As shown, the side surface 2 and the bottom surface 1 are connected by an arc, and the arc is tangent to the bottom surface 1 and intersects or is tangent to the side surface 2, thereby reducing the difficulty of processing while avoiding sharp corners that may cut the insulating film.

[0045] In this embodiment, preferably, Figure 6 As shown, the distance b2 between the center of the auxiliary area 3 and the side surface 2 is smaller than the distance b1 between the center of the middle area 4 and the side surface 2, and the distance a2 between the center of the auxiliary area 3 and the bottom surface 1 is equal to the distance a1 between the center of the middle area 4 and the bottom surface 1. At this time, the radius of the auxiliary area 3 is equal to that of the middle area 4, and the auxiliary area 3 is closer to the side surface 2 than the middle area 4, so the auxiliary area 3 is lower than the middle area 4, so in the process of coating, it can always be ensured that the pressure roller will first contact the lower auxiliary areas 3 at both ends, so that the insulating films on both sides will not gather in the middle, thereby avoiding the generation of wrinkles.

[0046] It should be noted that: it is not limited to the first structural relationship mentioned above, that is, the relationship that "the distance b2 between the center of the auxiliary area 3 and the side surface 2 is less than the distance b1 between the center of the middle area 4 and the side surface 2, and the distance a2 between the center of the auxiliary area 3 and the bottom surface 1 is equal to the distance a1 between the center of the middle area 4 and the bottom surface 1", and the following size definitions can also be used: For example: Second, as Figure 7 and Figure 8 As shown, the distance b2 between the center of the auxiliary area 3 and the side surface 2 is smaller than the distance b1 between the center of the middle area 4 and the side surface 2, and the distance a2 between the center of the auxiliary area 3 and the bottom surface 1 is smaller than the distance a1 between the center of the middle area 4 and the bottom surface 1. At this time, the radius of the auxiliary area 3 is smaller than the radius of the middle area 4, the auxiliary area 3 is closer to the side surface 2 and the bottom surface 1 than the middle area 4, and the auxiliary area 3 is lower than the middle area 4. Then, during the coating process, it can always be ensured that the pressure roller will first contact the lower auxiliary areas 3 at both ends, so that the insulating films on both sides will not gather in the middle, thereby avoiding the generation of wrinkles.

[0047] The third type, such as Figure 8 As shown, the distance b2 between the center of the auxiliary area 3 and the side surface 2 is smaller than the distance b1 between the center of the middle area 4 and the side surface 2, the distance a2 between the center of the auxiliary area 3 and the bottom surface 1 is smaller than the distance a1 between the center of the middle area 4 and the bottom surface 1, and the lengths of the projections of the line connecting the center of the auxiliary area 3 and the center of the middle area 4 on the bottom surface 1 and the side surface 2 are equal. At this time, the radius of the auxiliary area 3 is smaller than the radius of the middle area 4, and the auxiliary area 3 is closer to the bottom surface 1 and the side surface 2 relative to the middle area 4, and the auxiliary area 3 is lower than the middle area 4. During the coating process, it can always be ensured that the pressure roller will first contact the lower auxiliary area 3 at both ends, so that the insulating film on both sides will not be gathered in the middle, thereby avoiding the generation of wrinkles; at the same time, the distance between the center of the auxiliary area 3 and the center of the middle area 4 is equal in projection on the bottom surface 1 and the side surface 2, that is, the distance of the auxiliary area 3 offset to the bottom surface 1 and the side surface 2 relative to the middle area 4 is equal. When the projection distances of the line connecting the center of the auxiliary area 3 and the center of the middle area 4 on the bottom surface 1 and the side surface 2 are not equal, there are two cases: the projection of the line connecting the center of the auxiliary area 3 and the center of the middle area 4 on the side surface 2 is greater than the projection on the bottom surface 1; the projection of the line connecting the center of the auxiliary area 3 and the center of the auxiliary area 3 on the bottom surface 1 is greater than the projection on the side surface 2. Both of the above cases can achieve the technical effect that the auxiliary area 3 is lower than the middle area 4 and can first contact the insulating film. Compared with the scheme in which the projections of the line connecting the center of the auxiliary area 3 and the center of the middle area 4 on the bottom surface 1 and the side surface 2 are equal, the transition between the auxiliary area 3 and the middle area 4 on the side surface 2 and the bottom surface 1 is more uniform and easier to process.

[0048] The fourth type, such as Fig. 9As shown, the distance b2 between the center of the auxiliary region 3 and the bottom surface 1 is greater than the distance b1 between the center of the middle region 4 and the bottom surface 1, and the distance a2 between the center of the auxiliary region 3 and the side surface 2 is equal to the distance a1 between the center of the middle region 4 and the side surface 2. At this time, the radius of the auxiliary region 3 is greater than the radius of the middle region 4, and the auxiliary region 3 is closer to the bottom surface 1, so that during the coating process, the insulating film first contacts the auxiliary region 3 to avoid wrinkles.

[0049] The fifth type, such as Fig.10 As shown, the distance b2 between the center of the auxiliary area 3 and the bottom surface 1 is greater than the distance b1 between the center of the middle area 4 and the bottom surface 1, and the distance a2 between the center of the auxiliary area 3 and the side surface 2 is less than the distance a1 between the center of the middle area 4 and the side surface 2. At this time, the radius of the auxiliary area 3 is greater than the radius of the middle area 4. Since the bottom surface 1 and the side surface 2 of the battery shell are relatively fixed, the auxiliary area 3 is closer to the bottom surface 1 and the side surface 2 than the middle area 4. Therefore, during the film coating process, it can always be ensured that the pressure roller will first contact the lower auxiliary areas 3 at both ends, so that the insulating films on both sides will not be gathered in the middle, thereby avoiding the generation of wrinkles.

[0050] It can be seen that by designing the auxiliary area 3 and the middle area 4 according to the dimensional relationship in the above multiple schemes, the auxiliary area 3 can be lower than the middle area 4. Therefore, during the coating process, it can always be ensured that the pressure roller will first contact the lower auxiliary areas 3 at both ends, so that the insulating films on both sides will not gather in the middle, thereby avoiding the formation of wrinkles.

[0051] In this embodiment, preferably, Figure 6 As shown, the difference between the distance between the center of the auxiliary area 3 and the bottom surface 1 and the distance between the center of the middle area 4 and the bottom surface 1 is in the range of 0 to 3 mm. This difference range can not only ensure that the lithium battery shell can be placed stably on the horizontal surface without tilting, but also significantly improve the appearance problems such as membrane wrinkles, so the above difference range is selected.

[0052] In this embodiment, preferably, Fig.11 and Fig.12 As shown, the auxiliary area 3 and the shell are separately provided, and the inner side of the auxiliary area 3 is in contact with the shell.

[0053] According to the structure described above, when the film is applied, a correction block, namely the aforementioned auxiliary area 3, is added to the outside of the shell to ensure the excellent rate of the film coating, wherein the c surface is fitted with the higher edges on both sides of the bottom of the shell, and the a surface and the b surface need to be parallel and overlapped with the large surface and the bottom surface 1 of the shell respectively. In order to ensure the fitting effect, the radius of the c surface needs to be equal to the radius of the shell at the fitting point.

[0054] Further, preferably, the correction block, namely the aforementioned auxiliary area 3, can be connected to the housing by gluing. Of course, it is not limited to this, and other methods can also be used for connection.

[0055] It should be noted that: not limited to the above-mentioned "the auxiliary area 3 and the shell are set separately", the auxiliary area 3 and the shell can also be an integrated structure, which is designed according to actual needs.

[0056] In addition, it should be noted that: in this embodiment, there are two auxiliary areas 3 and an intermediate area 4 located between the two auxiliary areas 3. Of course, it is not limited to this. The number of auxiliary areas 3 and intermediate areas 4 can be multiple, but it is necessary to ensure that the auxiliary areas 3 and the intermediate areas 4 are alternately arranged, and along the length direction of the large surface of the battery shell provided with the auxiliary areas 3 and the intermediate areas 4, the auxiliary areas 3 should be located at the head end and the tail end. Here is an example to illustrate: Fig.13 As shown, two middle regions 4 and three auxiliary regions 3 are provided, wherein the middle regions 4 and the auxiliary regions 3 are arranged alternately.

[0057] Embodiment 2

[0058] Embodiment 2 of the present application also provides a battery cell, including an insulating film and the battery housing described in the above embodiment 1, and the insulating film wraps the battery housing. Therefore, it has all the beneficial technical effects of the battery housing, and the same technical features and beneficial effects are no longer repeated. In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0059] Embodiment 3

[0060] Embodiment 3 of the present application also provides a battery, including the battery cell described in the above embodiment 2. The battery mentioned in the embodiment of the present application refers to a single physical module including one or more single cells to provide higher voltage and capacity. In some embodiments, the battery can be a battery module. When there are multiple single cells, multiple single cells are arranged and fixed to form a battery module. In some embodiments, the battery can be a battery pack, and the battery pack includes a case and single cells, and the single cells or battery modules are accommodated in the case. In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc. Therefore, it has all the beneficial technical effects of the battery cell, and the same technical features and beneficial effects are not repeated.

[0061] Embodiment 4

[0062] Embodiment 4 of the present application also provides an electric device, including the battery described in the above embodiment 3. Multiple batteries can directly power the electric device, or they can form a power supply device in parallel, series or mixed connection, such as a battery module, to power various electric devices in the form of a power supply device. The electric device can be in various forms, for example, a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool or various household appliances, etc. For example, a spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. Electric toys include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. Therefore, it has all the beneficial technical effects of the battery, and the same technical features and beneficial effects are not repeated.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery housing, characterized in that: The battery casing comprises a bottom surface (1) and a side surface (2); an edge is formed at the junction of the bottom surface (1) and the side surface (2); the edge comprises an auxiliary area (3) and a middle area (4) located at both ends; the distance from the auxiliary area (3) to the bottom surface (1) is smaller than the distance from the middle area (4) to the bottom surface (1).

2. The battery housing according to claim 1, characterized in that: The side surface (2) and the bottom surface (1) are connected by an arc, and the arc is tangent to the bottom surface (1).

3. The battery housing according to claim 2, characterized in that: The distance between the center of the auxiliary area (3) and the side surface (2) is smaller than the distance between the center of the middle area (4) and the side surface (2), and the distance between the center of the auxiliary area (3) and the bottom surface (1) is equal to the distance between the center of the middle area (4) and the bottom surface (1).

4. The battery casing according to claim 2, characterized in that: The distance between the center of the auxiliary area (3) and the side surface (2) is smaller than the distance between the center of the middle area (4) and the side surface (2), and the distance between the center of the auxiliary area (3) and the bottom surface (1) is smaller than the distance between the center of the middle area (4) and the bottom surface (1).

5. The battery casing according to claim 4, characterized in that: The projection lengths of the line connecting the center of the auxiliary area (3) and the center of the middle area (4) on the bottom surface (1) and the side surface (2) are equal.

6. The battery casing according to claim 2, characterized in that: The distance between the center of the auxiliary area (3) and the bottom surface (1) is greater than the distance between the center of the middle area (4) and the bottom surface (1), and the distance between the center of the auxiliary area (3) and the side surface (2) is equal to the distance between the center of the middle area (4) and the side surface (2).

7. The battery case according to claim 2, characterized in that: The distance between the center of the auxiliary area (3) and the bottom surface (1) is greater than the distance between the center of the middle area (4) and the bottom surface (1), and the distance between the center of the auxiliary area (3) and the side surface (2) is less than the distance between the center of the middle area (4) and the side surface (2).

8. The battery housing according to any one of claims 3 to 7, characterized in that: The difference between the distance between the center of the auxiliary area (3) and the bottom surface (1) and the distance between the center of the middle area (4) and the bottom surface (1) is in the range of 0 to 3 mm.

9. The battery housing according to any one of claims 1 to 7, characterized in that: The auxiliary region (3) and the shell are arranged separately, and the inner side of the auxiliary region (3) is in contact with the shell.

10. A battery cell, characterized in that: The invention comprises an insulating film and a battery casing according to any one of claims 1 to 9, wherein the insulating film wraps the bottom surface and the side surfaces of the battery casing.

11. A battery, characterized in that: Comprising the battery cell as claimed in claim 10.

12. An electrical equipment, characterized in that: Comprising the battery of claim 11.

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