Secondary battery cellular board structure

Abstract

The invention discloses a cellular board structure of a secondary battery. The cellular board structure comprises a top cover, a cellular board, an elastic sheet and a battery box, the top cover is connected with the cellular board through an elastic piece, the head end of the elastic piece is fixedly connected to the top cover, the tail end is fixedly connected to the cellular board, and the two ends of the elastic piece have height difference. A plurality of blind holes are formed in the bottom surface of the cellular board and are distributed along the bottom surface of the cellular board to form a cellular structure; the honeycomb plate is provided with reinforcing ribs, and the reinforcing ribs extend from the center of the honeycomb plate to the two ends of the honeycomb plate. The battery box is provided with a containing cavity, an annular groove is formed in the top end of the containing cavity, the top cover is fixedly connected to the top end of the containing cavity to seal the containing cavity, and the cellular board is connected to the annular groove. The device has the advantages of simple structure, compact matching, reasonable design and the like; therefore, the device is a product with excellent technical and economical performance.

Description

TECHNICAL FIELD

[0001] The present application relates to a secondary battery honeycomb plate structure. BACKGROUND

[0002] With the rapid development of new energy vehicles and portable electronic devices, the demand for lightweight, high energy density and structural safety of the secondary battery system is increasingly urgent. The weight, deformation resistance and volume utilization of the battery box, as the core bearing structure of the battery module, directly affect the overall performance of the battery system.

[0003] Traditional battery boxes are mostly made of aluminum alloy or other metal materials, which have certain mechanical strength, but the internal gas pressure changes during the charging and discharging process of the battery, which can cause the deformation of the shell. The existing structure lacks a dynamic volume adjustment mechanism and has the risk of cracking. The cover plate and the box body are rigidly connected and cannot respond to changes in internal gas pressure. Therefore, we developed a battery box scheme integrating lightweight honeycomb structure and pressure self-adaptive adjustment to break through the current technical limitations. SUMMARY

[0004] To solve at least one of the above problems, the present application proposes a new structure scheme, which adopts the following technical scheme:

[0005] A secondary battery honeycomb plate structure, comprising a top cover, a honeycomb plate, a spring piece, and a battery box.

[0006] The top cover is connected to the honeycomb plate through the spring piece. The first end of the spring piece is fixed to the top cover, and the last end is fixed to the honeycomb plate. The two ends of the spring piece have a height difference.

[0007] The bottom surface of the honeycomb plate is provided with a plurality of blind holes, which are arranged in a honeycomb structure along the bottom surface of the honeycomb plate. The honeycomb plate is provided with a reinforcing rib, which extends from the center of the honeycomb plate to both ends of the honeycomb plate.

[0008] The battery box has a cavity, the top end of which is provided with a ring groove. The top cover is fixed to the top end of the cavity to close the cavity, and the honeycomb plate is connected to the ring groove.

[0009] Preferably, the edge of the honeycomb plate is provided with a sealing ring, which is in contact with the wall surface of the ring groove.

[0010] Preferably, the area of the ring groove is larger than the area of the cavity.

[0011] Preferably, the spring piece is provided with a bending position near the first end.

[0012] Preferably, the bottom of the honeycomb plate is provided with a groove, the length of which is consistent with that of the reinforcing rib, and the groove is recessed into the reinforcing rib.

[0013] The present application has the following advantages compared with the background art:

[0014] In the initial state, the honeycomb plate is affected by the elastic force of the spring, and the honeycomb plate is lowered to the bottom position of the ring groove. When the pressure in the battery box increases, the honeycomb plate will be pushed up to prevent the battery box from deforming. Since the honeycomb plate moves up, it will push the spring up, and the spring is provided with a bending position near the first end position. The bending position will first abut against the top cover to prevent the honeycomb plate from continuing to move up. When the pressure continues to increase, it will push the end of the spring to continue to bend, and continue to push the honeycomb plate up to the top position of the ring groove. The pressure in the battery box is adapted by the position change of the honeycomb plate to prevent the battery box from deforming. It has the advantages of simple structure, compact cooperation, reasonable design, etc. Therefore, it is a product with superior performance in technology and economy. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The top cover of the preferred embodiment provided by the application encapsulates the cavity to form a whole;

[0016] Figure 2 The first perspective view of the secondary battery honeycomb plate structure in the preferred embodiment provided by the application;

[0017] Figure 3 The second perspective view of the secondary battery honeycomb plate structure in the preferred embodiment provided by the application;

[0018] Figure 4 The first state diagram of the cooperation between the honeycomb plate and the spring in the preferred embodiment provided by the application;

[0019] Figure 5 The second state diagram of the cooperation between the honeycomb plate and the spring in the preferred embodiment provided by the application;

[0020] Figure 6 The third state diagram of the cooperation between the honeycomb plate and the spring in the preferred embodiment provided by the application;

[0021] Figure 7 The connection diagram of the sealing ring and the honeycomb plate in the preferred embodiment provided by the application. DETAILED DESCRIPTION

[0022] The embodiments of the application will be described in detail below, and the described embodiments are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout.

[0023] In the present application, unless otherwise explicitly specified and limited, the terms such as "assembly", "connection", "linkage" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection; it can be direct connection, or connection through intermediate medium, or internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The technical scheme of the present application and its beneficial effects will be clearer and more explicit through the further description of the specific embodiments of the present application in combination with the accompanying drawings of the specification. The following description of the embodiments by referring to the accompanying drawings is exemplary, and is intended to explain the present application, but cannot be understood as a limitation of the present application.

[0025] The preferred embodiments provided by the present application are as follows: Figures 1-7 As shown in the figure, a secondary battery honeycomb plate structure comprises a top cover 1, a honeycomb plate 2, a spring sheet 3, and a battery box 4.

[0026] The top cover 1 is connected with the honeycomb plate 2 through the spring sheet 3, the first end of the spring sheet 3 is fixedly connected with the top cover 1, the last end is fixedly connected with the honeycomb plate 2, and the two ends of the spring sheet 3 have a height difference.

[0027] The bottom surface of the honeycomb plate 2 is provided with a plurality of blind holes 21, the blind holes 21 are arranged along the bottom surface of the honeycomb plate 2 to form a honeycomb structure; the honeycomb structure realizes significant lightweight. The honeycomb structure is a kind of high-efficiency engineering design, which provides superior specific strength and specific stiffness. According to the research of Tsinghua University, the honeycomb structure has higher porosity and lower mass density than its base material, while maintaining very high specific strength and specific energy absorption. This means that the battery honeycomb plate can greatly reduce the weight while maintaining the same strength. Taking a composite material honeycomb plate as an example, its density is about 1.9 g / cm 3 , which is much lower than the traditional aluminum alloy material, and the thickness can be 1.2 mm or thinner under the premise of meeting the mechanical performance.

[0028] The honeycomb plate 2 is provided with a reinforcing rib 22, the reinforcing rib 22 extends from the center of the honeycomb plate 2 to both ends of the honeycomb plate 2 body; the cross section of the blind hole 21 is in the shape of an edge angle or a circle, and the number of edges constituting the edge angle is at least three, such as a triangle, a quadrilateral, a pentagon, etc. The bottom of the honeycomb plate 2 is provided with a groove 23, the length of the groove 23 is consistent with that of the reinforcing rib 22, the groove 23 is recessed into the reinforcing rib 22, and the weight of the honeycomb plate 2 is further reduced.

[0029] The battery box 4 has a cavity 41, and the top end of the cavity 41 is provided with a ring groove 42, the area of the ring groove 42 is larger than the area of the cavity 41, so as to limit the movement of the honeycomb plate 2 at the position of the ring groove 42, and the inner recess of the ring groove can make the honeycomb plate be abutted when moving to the top end of the ring groove, and the reinforcing ribs can improve the deformation resistance of the honeycomb plate.

[0030] The top cover 1 is fixed to the top end of the cavity 41 to seal the cavity 41, and the honeycomb plate 2 is connected to the ring groove 42. The edge of the honeycomb plate 2 is provided with a sealing ring 23, and the sealing ring 23 is abutted with the wall surface of the ring groove 42, so as to prevent air leakage. The edge of the honeycomb plate 2 is provided with a recess 24, and the recess 24 has an open port 25, the sealing ring 23 is embedded in the recess 24, and the sealing ring 23 is partially exposed to the open port 25 to abut with the wall surface of the ring groove 42; the diameter of the sealing ring 23 is larger than the height of the open port 25, so as to limit the sealing ring 23 from being taken out of the recess 24.

[0031] The top cover 1 is fixed to the top of the battery box 4 to seal the cavity 41, and the maximum volume of the battery box 4 has been determined, in order to realize the volume adjustment of the battery box 4, the top cover 1 is additionally provided with the honeycomb plate 2, in order to improve the volume utilization, the honeycomb plate 2 is arranged with a plurality of blind holes 21 to form a honeycomb shape, and the space utilization is increased. In the initial state, the honeycomb plate 2 is affected by the elastic force of the elastic sheet 3, and the honeycomb plate 2 is lowered to the bottom position of the ring groove 42, when the pressure in the battery box 4 increases, in order to prevent the deformation of the battery box 4, the honeycomb plate 2 will be pushed upward, since the upward movement of the honeycomb plate 2 will push the elastic sheet 3 to move upward, and the elastic sheet 3 is provided with a bending position 31 near the top end position, the bending position will first abut against the top cover 1 to prevent the honeycomb plate 2 from continuing to move upward, when the pressure continues to increase, the elastic sheet 3 at the end will continue to bend, and the honeycomb plate 2 will continue to be pushed upward to the top position of the ring groove 42, and the pressure in the battery box 4 is adjusted through the position change of the honeycomb plate 2, so as to prevent the deformation of the battery box 4.

[0032] In the description of the specification, the description of the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application, and the illustrative description of the above terms in the specification does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Through the above description of the structure and principle, those skilled in the art should understand that the present application is not limited to the above specific embodiments, and the improvements and replacements of the technology known in the art based on the present application all fall within the protection scope of the present application, which should be defined by the claims.

Claims

1. A secondary battery honeycomb panel structure, characterized by: It includes top cover, honeycomb panel, shrapnel and battery box; The top cover is connected to the honeycomb panel through a spring clip, the head end of the spring clip is fixed to the top cover, and the tail end is fixed to the honeycomb panel, and there is a height difference between the two ends of the spring clip; The bottom surface of the honeycomb panel is provided with a plurality of blind holes, which are arranged along the bottom surface of the honeycomb panel to form a honeycomb structure; the honeycomb panel is provided with reinforcing ribs, which extend from the center of the honeycomb panel to both ends of the honeycomb panel; The battery box has a cavity, a top end of the cavity is provided with an annular groove, a top cover is fixed to the top end of the cavity to close the cavity, and the honeycomb panel is connected to the annular groove.

2. The secondary battery honeycomb panel structure according to claim 1, characterized in that: A sealing ring is provided on the edge of the honeycomb panel, and the sealing ring is connected to the wall surface of the ring groove.

3. The secondary battery honeycomb panel structure according to claim 1, characterized in that: The area of ​​the annular groove is larger than the area of ​​the cavity.

4. The secondary battery honeycomb panel structure according to claim 1, characterized in that: A bending position is provided near the head end of the spring piece.

5. The secondary battery honeycomb panel structure according to claim 1, characterized in that: A groove is provided at the bottom of the honeycomb panel. The groove is consistent with the length of the reinforcing rib and is recessed into the reinforcing rib.

Images