Box cover, battery pack and electric equipment

Abstract

The utility model provides a box cover, a battery pack and electric equipment. The box cover comprises a cover body; the frame body is arranged along the periphery of the cover body, and the frame body is provided with a to-be-reinforced part far away from the cover body; and the reinforcing piece is embedded in the to-be-reinforced part along the circumferential direction of the frame body. The reinforcing piece is embedded in the circumferential direction of the to-be-reinforced part which is easy to generate cracks, so that the strength of the original to-be-reinforced part is improved, and the cracks are not easy to generate. By embedding the reinforcing piece into the to-be-reinforced part, the to-be-reinforced part can be prevented from cracking under pressure while the whole energy density of the battery is not changed, so that the problems of poor air tightness of the whole bag and risk of water inflow caused by the fact that the to-be-reinforced part is easy to generate cracks are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a box cover, a battery pack and electrical equipment. Background Art

[0002] At present, most of the box covers of battery systems include sheet metal box covers and composite material box covers. Sheet metal box covers are divided into steel and aluminum materials. Battery energy density is an important indicator of battery performance. It refers to the amount of energy that can be stored in a unit battery capacity. The calculation formula is: battery energy density = total battery capacity / battery weight. Under the premise that the total battery capacity is equal, the heavier the battery, the smaller the battery energy density, and vice versa. Therefore, the heavier steel box cover has a greater impact on the energy density of the battery system. The forming process requires bending, welding and electrophoresis painting. The process is relatively complicated and there is a risk of rust. The aluminum box cover is relatively light, but the overall strength is not enough and it is easy to deform. In addition, the forming process of the aluminum box cover is the same as that of the steel box cover, and there is also a relatively complicated process and a risk of rust.

[0003] In the related art, the box cover made of composite materials has certain strength, but it is easy to crack, which affects the air tightness of the whole package and there is a risk of water ingress. Utility Model Content

[0004] The embodiments of the present application provide a box cover, a battery pack and an electrical device, which can improve the technical problem that a box cover made of composite materials is prone to cracks.

[0005] In a first aspect, an embodiment of the present application provides a box cover, comprising:

[0006] Cover body;

[0007] A frame body is arranged along the periphery of the cover body, and the frame body has a portion to be strengthened away from the cover body;

[0008] The reinforcing member is embedded in the portion to be reinforced along the circumferential direction of the frame.

[0009] In one embodiment, the frame body has a first extension portion and a second extension portion, the first extension portion is extended from the cover body, the second extension portion is connected to the end of the first extension portion away from the cover body, and extends outward in a direction parallel to the cover body, the portion to be reinforced includes the second extension portion, the reinforcement member includes a first reinforcement sub-member, and the first reinforcement sub-member is embedded along the extension direction of the second extension portion.

[0010] In one embodiment, the second extension portion has a first surface and a second surface arranged opposite to each other along the thickness direction thereof, a distance from a center plane of the first reinforcement sub-component parallel to the direction of the second extension portion to the first surface is h1, a distance from a center plane of the first reinforcement sub-component parallel to the direction of the second extension portion to the second surface is h2, and h1:h2=0.5:1~1:0.5.

[0011] In one embodiment, the portion to be reinforced further includes an end portion where the first extension portion is connected to the second extension portion, and the reinforcement member further includes a second reinforcement sub-member, and the second reinforcement sub-member is embedded in the end portion.

[0012] In one embodiment, the end of the second reinforcement sub-component away from the cover body is connected to the first reinforcement sub-component.

[0013] In one embodiment, the first reinforcement sub-component and the second reinforcement sub-component are integrally formed.

[0014] In one embodiment, the thickness of the first reinforcing sub-component is 1 to 2 cm; and / or

[0015] The thickness of the second reinforcement sub-component is 1 to 2 cm.

[0016] In one embodiment, the first reinforcement sub-component is a steel member; and / or

[0017] The second reinforcement sub-component is a steel member.

[0018] In one embodiment, the cover body and the frame body are integrally formed.

[0019] In one embodiment, the thickness of the cover is 3 to 5 cm; and / or

[0020] The thickness of the second extension portion is 3 to 5 cm; and / or

[0021] The thickness of the end portion where the first extension portion is connected to the second extension portion is 3 to 5 cm.

[0022] In one embodiment, the cover is made of PCM material or SMC material; and / or

[0023] The frame is made of PCM material or SMC material.

[0024] In a second aspect, an embodiment of the present application provides a battery pack, comprising:

[0025] Box;

[0026] at least one battery module; and

[0027] As for the box cover provided in the first aspect above, the box body is used to install the battery module, and the box cover is connected to the box body.

[0028] In a third aspect, an electrical device comprises the battery pack as provided in the second aspect above.

[0029] Beneficial effects of the embodiments of the utility model:

[0030] In an embodiment of the utility model, a box cover is provided, comprising: a cover body; a frame body, arranged along the periphery of the cover body, the frame body having a portion to be reinforced away from the cover body; and a reinforcing member, embedded in the portion to be reinforced along the circumference of the frame body. By embedding the reinforcing member in the circumference of the portion to be reinforced that is prone to cracking, the portion to be reinforced has a certain toughness, the strength is increased, and it is not easy to crack. By embedding the reinforcing member in the portion to be reinforced, the risk of the portion to be reinforced being cracked due to pressure can be reduced while ensuring that the overall energy density of the battery remains unchanged, thereby improving the problem that the portion to be reinforced is prone to cracking, resulting in poor airtightness of the entire package and the risk of water ingress. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a three-dimensional schematic diagram of a box cover provided by an embodiment of the utility model;

[0033] Figure 2 The embodiment of the utility model provides Figure 1 A magnified view of middle;

[0034] Figure 3 It is an exploded view of a box cover provided by an embodiment of the utility model;

[0035] Figure 4 It is a bottom view of the box cover provided by the embodiment of the utility model;

[0036] Figure 5 The embodiment of the utility model provides Figure 4 Cross-sectional view of the middle DD;

[0037] Figure 6 The embodiment of the utility model provides Figure 5 Enlarged view of middle B;

[0038] Figure 7 The embodiment of the utility model provides Figure 4Cross-sectional view of CC;

[0039] Figure 8 The embodiment of the utility model provides Figure 3 Enlarged view of E.

[0040] Figure numerals: 1-box cover, 11-cover body, 12-frame body, 13-first extension part, 14-second extension part, 15-part to be reinforced; 2-reinforcement member, 21-first reinforcement sub-member, 22-second reinforcement sub-member, 23-bending part. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present utility model.

[0042] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description". Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. In order to enable any technician in the field to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the utility model with unnecessary details. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0044] See also Figure 1 and 2 , an embodiment of the present application provides a box cover 1, comprising:

[0045] Cover body 11;

[0046] The frame 12 is arranged along the periphery of the cover 11, and the frame 12 has a portion 15 to be reinforced away from the cover 11;

[0047] The reinforcement member 2 is embedded in the portion to be reinforced 15 along the circumferential direction of the frame 12 .

[0048] It is understandable that the cover body 11 can be in a rectangular, square or circular shape, etc. Such a shape is easy to process, has a wide range of applications and is highly practical.

[0049] It can be understood that the frame 12 can be a cubic frame 12, a rectangular frame 12 or a cylindrical frame 12. Such a shape is consistent with the shape of the cover 11, has strong adaptability and is easy to process.

[0050] It can be understood that the portion to be reinforced 15 is a part of the frame 12 and is a part of the frame 12 away from the cover 11. The portion to be reinforced 15 is a part that is prone to cracks. For example, the bending portion 23 can be an acute angle bend, a right angle bend or an obtuse angle bend. The bending portion 23 has a large bending radius, so its strength is insufficient.

[0051] It can be understood that the reinforcement member 2 is a component used to increase the structural strength of the above-mentioned part to be reinforced 15. The reinforcement member can be made of a rigid material, for example, a steel structure. The reinforcement member 2 is embedded in the part to be reinforced 15 along the circumference of the frame 12, and can be directly inserted in the circumference during hot processing, or can be placed in the mold in advance during injection molding. The reinforcement member 2 is embedded in the part to be reinforced 15 to increase toughness and prevent fracture.

[0052] In some embodiments, the reinforcement member 2 is embedded in the portion to be reinforced 15 from the center of the circumferential edge of the frame 12, so that the thickness of the portion to be reinforced 15 on both sides of the reinforcement member 2 is the same, and the overall structure is balanced and stable.

[0053] In some embodiments, the reinforcement member 2 is embedded in the portion to be reinforced 15 from one side of the center position of the circumferential edge of the frame 12. In this way, the reinforcement member 2 can be embedded on the side of the portion to be reinforced 15 that is prone to cracks according to needs, so that the entire portion to be reinforced 15 is not prone to cracks.

[0054] Compared with the related art, the box cover 1 provided in the embodiment of the present application embeds a reinforcing member in the circumferential direction of the part to be reinforced 15 which is prone to cracking, so that the original part to be reinforced 15 has a certain toughness, increases strength, and is not prone to cracking. By embedding the reinforcing part into the part to be reinforced, the energy density of the whole battery can be kept unchanged while preventing the part to be reinforced 15 from being cracked by pressure, thereby improving the problem that the part to be reinforced 15 is prone to cracking, resulting in poor airtightness of the whole package and the risk of water ingress.

[0055] See also Figure 1 and 2 In some embodiments, the frame body 12 has a first extension portion 13 and a second extension portion 14. The first extension portion 13 extends from the cover body 11. The second extension portion 14 is connected to the end of the first extension portion 13 away from the cover body 11 and extends outward in a direction parallel to the cover body 11. The portion to be reinforced 15 includes the second extension portion 14. The reinforcement component 2 includes a first reinforcement sub-component 21. The first reinforcement sub-component 21 is embedded along the extension direction of the second extension portion 14.

[0056] It can be understood that the first extension portion 13 has a first end and a second end that are relatively arranged, the first end is connected to the cover body 11, and the second end extends in a direction away from the cover body 11; the second extension portion 14 has a third end and a fourth end that are relatively arranged, the third end is connected to the second end, and the fourth end extends outward in a direction parallel to the cover body 11.

[0057] Furthermore, the second extension portion 14 has a first surface and a second surface arranged opposite to each other along its thickness direction, and the distance from the center plane of the first reinforcement sub-component 21 parallel to the direction of the second extension portion 14 to the first surface is h1, and the distance from the center plane of the first reinforcement sub-component 21 parallel to the direction of the second extension portion 14 to the second surface is h2, and h1:h2=0.5:1~1:0.5.

[0058] It can be understood that h1:h2=0.5:1~1:0.5, for example, h1:h2=0.5:1, h1:h2=0.6:1, h1:h2=0.7:1, h1:h2=0.8:1, h1:h2=0.9:1, h1:h2=1:1, h1:h2=1:0.1, h1:h2=1:0.2, h1:h2=1:0.3, h1:h2=1:0.4, h1:h2=1:0.5 or any intermediate value within the range defined by any two of the above. Within the above range, the portion to be reinforced 15 can have a certain toughness, increase strength, and is not prone to cracks.

[0059] Preferably, h1:h2=1:1, in which case the distance between the center plane of the first reinforcing sub-component 21 parallel to the second extension portion 14 and the first surface is equal to the distance between the center plane of the first reinforcing sub-component 21 parallel to the second extension portion 14 and the second surface. With such a configuration, the overall box cover 1 has a stable structure, the toughness of the portion to be reinforced 15 is the best, the strength is the highest, and processing is convenient.

[0060] See also Figure 1 and Figure 2 and Figure 4-7 In some embodiments, the portion to be reinforced 15 further includes an end portion where the first extension portion 13 and the second extension portion 14 are connected, and the reinforcement member 2 further includes a second reinforcement sub-member 22, which is embedded in the end portion.

[0061] It can be understood that the second reinforcing sub-component 22 includes a bending portion 23 and a third reinforcing portion arranged along the first extension portion, and the third reinforcing portion includes a seventh end and an eighth end arranged opposite to each other, the seventh end is located on a side close to the cover plate, the eighth end is connected to one end of the bending portion 23, and the other end of the bending portion 23 is connected to the fifth end of the first reinforcing sub-component 21. Exemplarily, the first reinforcing sub-component 21, the bending portion 23 and the third reinforcing portion are integrally formed, so that the processing is convenient, and the entire reinforcing member 2 is stable and firm, and has high safety. Another exemplary method is that the first reinforcing sub-component 21, the bending portion 23 and the third reinforcing portion are welded and formed, so that the materials of the first reinforcing sub-component 21, the bending portion 23 and the third reinforcing portion can be the same, for example, all are made of steel. This can prevent the problem that there will be a large bending radius at the bending point and cracks are easy to occur. The materials of the first reinforcing sub-component 21, the bending portion 23 and the third reinforcing portion can be the same or different, and this application does not limit this.

[0062] In some embodiments, the reinforcement member 2 further includes a bending portion 23, and the bending portion 23 connects the first reinforcement member 21 and the second reinforcement member 22. Specifically, the fifth end of the first reinforcement member 21 is connected to one end of the bending portion 23, and the second reinforcement member 22 includes a ninth end and a tenth end, the ninth end is connected to the other end of the bending portion 23, and the tenth end extends in a direction close to the cover body 11.

[0063] Further, the thickness of the first reinforcing sub-component 21 is 1 to 2 cm, for example, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, or an intermediate value within the range defined by any two of the above; and / or

[0064] The thickness of the second reinforcing sub-component 22 is 1 to 2 cm, for example, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, or an intermediate value in the range defined by any two of the above.

[0065] Furthermore, the thickness of the cover 11 is 3 to 5 cm, for example, 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, or an intermediate value within the range defined by any two of the above; and / or

[0066] The thickness of the frame 12 is 3 to 5 cm, for example, 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, or an intermediate value within the range defined by any two of the above.

[0067] Furthermore, the thickness of the second extension portion 14 is 3 to 5 cm, for example, 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, or an intermediate value in the range defined by any two of the above ranges.

[0068] The thickness of the end portion where the first extension portion 13 and the second extension portion 14 are connected is 3 to 5 cm, for example, 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, or an intermediate value within the range defined by any two of the above.

[0069] It can be understood that the thickness of the second extension portion 14 may be equal to or different from the thickness of the end portion where the first extension portion 13 and the second extension portion 14 are connected, and the present application is not limited thereto.

[0070] Preferably, the thickness of the entire frame is uniform. Such a configuration facilitates processing, and the entire frame has good stability and high strength.

[0071] Within the above thickness range, the weight of the box cover 1 is controlled while ensuring absolute strength, and the portion 15 to be reinforced will not crack due to pressure.

[0072] Furthermore, the first reinforcement sub-component 21 is a steel component; and / or the second reinforcement sub-component 22 is a steel component. Exemplarily, the first reinforcement sub-component 21 and the second reinforcement sub-component 22 are both steel components, and the first reinforcement sub-component 21 and the second reinforcement sub-component 22 are integrally formed. This facilitates processing. When preparing the box cover 1, the integrally formed first reinforcement sub-component 21 and the second reinforcement sub-component 22, i.e., the reinforcement component 2, is directly placed in the processing mold of the box cover 1, which is convenient for molding, simple processing, and the prepared box cover 1 has high strength and stability.

[0073] See also Figure 3 and Figure 8 In some embodiments, the cover 11 is made of PCM material or SMC material; and / or the frame 12 is made of PCM material or SMC material. Exemplarily, both the box cover 1 and the frame 12 are made of PCM material. In another exemplary embodiment, both the box cover 1 and the frame 12 are made of SMC material. In another exemplary embodiment, the material of the box is PCM material, and the material of the frame 12 is SMC material. It should be noted that the material of the box can be the same as that of the frame 12, or different, and can be selected as needed, and this application does not limit this.

[0074] Furthermore, the cover 11 and the frame 12 are integrally formed. The box cover 1 is prepared by a mold opening process, and the cover 11, the frame 12 and the reinforcement 2 can be formed together by injection molding. The reinforcement 2 must be placed in the mold each time the mold is opened and closed during production. The production process is simple, and the prepared box cover 1 has high overall strength.

[0075] An embodiment of the present application provides a battery pack, comprising: a box body; at least one battery module; and the box cover 1, wherein the box body is used to install the battery module, and the box cover 1 is connected to the box body. The box cover 1 of this embodiment is connected to the box body, and because the reinforcement member 2 is embedded in the portion to be reinforced 15, the absolute strength of the box cover 1 is guaranteed. At the same time, through the selection of the above thickness and material, the weight of the cover 11 is controlled and the cover will not crack due to pressure at the bend.

[0076] An embodiment of the present application provides an electrical device, including the above-mentioned battery pack.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0078] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0079] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0080] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0081] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0082] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the attached materials of this application are inconsistent or conflicting with the content of this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

[0083] The box cover provided in the embodiment of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the present utility model. At the same time, for technicians in this field, according to the idea of ​​the present utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present utility model.

Claims

1. A box cover, characterized in that: include: Cover body; A frame body is arranged along the periphery of the cover body, and the frame body has a portion to be strengthened away from the cover body; A reinforcing member, embedded in the portion to be reinforced along the circumference of the frame; The frame body has a first extension portion and a second extension portion, the first extension portion is extended from the cover body, the second extension portion is connected to the end of the first extension portion away from the cover body, and extends outward in a direction parallel to the cover body, the portion to be reinforced includes the second extension portion, the reinforcement member includes a first reinforcement sub-member, and the first reinforcement sub-member is embedded along the extension direction of the second extension portion.

2. The box cover according to claim 1, characterized in that: The second extension portion has a first surface and a second surface arranged opposite to each other along its thickness direction, the distance from the center plane of the first reinforcement sub-component parallel to the direction of the second extension portion to the first surface is h1, and the distance from the center plane of the first reinforcement sub-component parallel to the direction of the second extension portion to the second surface is h2, h1:h2=0.5:1~1:0.

5.

3. The box cover according to claim 1, characterized in that: The portion to be reinforced further includes an end portion where the first extension portion is connected to the second extension portion, and the reinforcement member further includes a second reinforcement sub-member, and the second reinforcement sub-member is embedded in the end portion.

4. The box cover according to claim 3, characterized in that: The end of the second reinforcement sub-component away from the cover body is connected to the first reinforcement sub-component.

5. The box cover according to claim 3 or 4, characterized in that: The thickness of the first reinforcing component is 1 to 2 cm; and / or The thickness of the second reinforcement sub-component is 1 to 2 cm.

6. The box cover according to any one of claims 1 to 5, characterized in that: The thickness of the cover is 3 to 5 cm; and / or The thickness of the second extension portion is 3 to 5 cm; and / or The thickness of the end portion where the first extension portion is connected to the second extension portion is 3 to 5 cm.

7. A battery pack, characterized in that: include: Box; at least one battery module; as well as The box cover according to any one of claims 1 to 6, wherein the box body is used to install the battery module, and the box cover is connected to the box body.

8. Electrical equipment, characterized in that: Comprising the battery pack as claimed in claim 7.

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