A battery box pultruded expansion beam structure

Abstract

The present application discloses a battery box pultruded expansion beam structure, which belongs to the technical field of battery boxes. It includes an expansion beam, including a crossbeam and an end portion bonded to the crossbeam; a glue injection hole, which is provided on the crossbeam for glue injection; a limit strip, which is bonded and arranged on the end wall of one side of the end portion that is attached to the crossbeam, for limiting the glue injection position; and a fluid space, which is arranged in the limit strip. The beneficial effect of the present application is to provide a battery box pultruded expansion beam structure that ensures the glue injection effect.

Description

Technical Field

[0001] The present application relates to the technical field of battery boxes, and in particular to a pultruded expansion beam structure of a battery box. Background Art

[0002] For pure electric vehicles, weight reduction is an effective way to improve their power and endurance. Compared with metal materials, composite materials have superior mechanical properties. For composite battery boxes, welding is no longer suitable for connecting composite structures. When the battery box beam is installed on the box, end caps need to be set at both ends, which are usually fixed by gluing. When the end head is inserted into the beam, it needs to be set with a clearance fit to facilitate insertion. Therefore, it is impossible to set a fence in at least two directions at the gluing position of the end head. However, in fact, fences need to be set in at least three directions to limit the injection position. Therefore, it is necessary to set a glue injection strip corresponding to the injection hole of the end head to ensure glue injection. The one-piece molding of the end head and the strip will lead to a more complicated mold design. At the same time, due to the need to match the clearance with the beam, it cannot play a role in blocking glue. Most of them adopt the method of later installation. At the same time, in order to ensure the sealing effect of the strip on the injection area, rubber flexible material is usually used, so that the end head and the beam wall squeeze the strip. However, when the end head and the reinforcing beam are assembled, the strip will be pushed to cause slippage. Most of the existing methods are chamfering the end of the strip to guide the beam wall, but the chamfer will affect the sealing effect.

[0003] Therefore, a battery box pultruded expansion beam structure that ensures the glue injection effect is needed. Summary of the invention

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a battery box pultruded expansion beam structure, including: an expansion beam, including a crossbeam and an end portion bonded to the crossbeam; a glue injection hole, which is provided on the crossbeam for glue injection; a limit strip, which is bonded to the end wall on one side of the end portion that fits the crossbeam, for limiting the glue injection position; a fluid space, which is provided in the limit strip, and the fluid space is filled with fluid rubber. The limit strip includes: a side strip extending along the insertion direction of the crossbeam and a bottom strip connected to one side of the side strip portion, a connected fluid space is provided in the side strip and the bottom strip, a sealing structure is provided on the side strip and the bottom strip and extends along the side strip and the bottom strip, the side wall of the sealing structure is thinner, and a step is provided on the inner wall of the crossbeam, and the step abuts against the bag portion.

[0006] Furthermore, the side strips, the bottom strips and the end heads are surrounded to form a glue injection space, the bottom strips are located on a side away from the end head where the cross beam is inserted, and the glue injection hole is located at the upper end of the glue injection space.

[0007] Furthermore, the two side strips and the bottom strip surround to form a U-shaped space, the bottom strip is located on a side away from the end of the beam insertion, and the glue injection hole is located at the upper end of the U-shaped space.

[0008] Furthermore, the bottom strip includes: a bag portion with an upwardly protruding end wall and connecting portions arranged on both sides of the bag portion and connected to the side strips, and a buffer structure is arranged between the bag portion and the connecting portions.

[0009] Furthermore, the upper end of the side strip exceeds the end head and the exceeding part is provided with an inclined plate which is inclined toward the end head and the side wall of the beam respectively. One end of the two inclined plates is respectively connected to a side surface of the limiting strip which fits the end head and a side surface of the limiting strip which fits the beam.

[0010] Furthermore, a step is provided on the inner wall of the beam, and the step abuts against the bag portion.

[0011] Furthermore, the main structure of the expansion beam is formed by a pultrusion process, the outer side of the expansion beam is wrapped with fiber cloth, and the inner wall of the expansion beam is covered with unidirectional yarn.

[0012] Furthermore, the inner cavity of the expansion beam is filled with foaming material formed by a foaming process.

[0013] The beneficial effect of the present application is that it provides a battery box pultruded expansion beam structure that ensures the glue injection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0015] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0016] In the attached picture:

[0017] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the installation of the expansion beam in the embodiment;

[0019] Figure 3 yes Figure 1 A partial enlarged view of the end in the embodiment;

[0020] Figure 4 yes Figure 1 A schematic structural diagram of a limit strip in an embodiment;

[0021] Figure 5 This is a schematic diagram of the installation of the crossbeam and the end cap in the embodiment;

[0022] Figure 6 Schematic diagram of the structure of the crossbeam in the embodiment.

[0023] Reference numerals:

[0024] 100. expansion beam; 101. cross beam; 102. end; 103. glue injection hole; 104. limit strip; 105. fluid space; 106. side strip; 107. bottom strip; 108. bag part; 109. connection part; 110. buffer structure; 111. sealing structure; 112. inclined plate; 113. glue injection space; 114. fiber cloth; 115. unidirectional yarn; 116. foam material. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0026] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0027] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0028] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0029] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0030] Reference Figure 1-6A battery box pultruded expansion beam structure includes an expansion beam 100, the expansion beam 100 includes a cross beam 101 and an end 102 bonded to the cross beam 101, and a glue injection hole 103 is opened on the side wall of the cross beam 101. A limit strip 104 located at the glue injection hole 103 is fixedly arranged on the end 102. The end 102 is arranged at both ends of the cross beam 101, and the end 102 is inserted into the cross beam 101.

[0031] The limit strip 104 is made of rubber and is bonded to the end wall of the end 102 on one side of the beam 101 to limit the injection position. A fluid space 105 extending along the limit strip 104 is provided in the limit strip 104 and is filled with fluid rubber.

[0032] In one embodiment, the limiting strip 104 includes: two side strips 106 extending along the insertion direction of the cross beam 101 and a bottom strip 107 connecting the lower ends of the two side strips 106, and a connected fluid space 105 is provided in the side strips 106 and the bottom strip 107, and the fluid space 105 is filled with fluid rubber. The side strips 106 and the bottom strip 107 surround and form a glue injection space 113.

[0033] The bottom strip 107 includes: a bag portion 108 protruding toward the upper end wall, and connecting portions 109 arranged on both sides of the bag portion 108 and the side strip 106. A buffer structure 110 is arranged between the bag portion 108 and the connecting portion 109. The buffer structure 110 is deformed when the bag portion 108 is squeezed to avoid pulling the side strip 106. A sealing structure 111 is arranged on the side strip 106 and the bottom strip 107 and extends along the side strip 106 and the bottom strip 107. The side wall of the sealing structure 111 is relatively thin. When the bag portion 108 is not under pressure, the sealing structure 111 is flush with the surface of the limiting strip 104. When the bag portion 108 is squeezed, the sealing structure 111 protrudes toward the side with the thinner side wall.

[0034] The upper end of the side strip 106 exceeds the end 102, and the exceeding part is provided with an inclined plate 112 which is inclined toward the end 102 and the side wall of the beam 101, respectively. One end of the two inclined plates 112 is respectively connected to the side of the limiting strip 104 which is in contact with the end 102 and the side of the limiting strip 104 which is in contact with the side wall of the beam 101. The inclined plates 112 are made of plastic material. When the upper end wall of the beam 101 presses the two inclined plates 112, one end of the two inclined plates 112 is respectively in contact with the side wall of the end 102 and the side wall of the beam 101, so that the two side surfaces of the side strip 104 are respectively close to the end 102 and the beam 101.

[0035] In one embodiment, a step 117 is provided on the inner wall of the cross beam 101, and the upper plane of the step 117 abuts against the bag portion 108. The fluid rubber in the bag portion 108 is squeezed into the side strips 106 and the bottom strips 107, so that the sealing structure 111 bulges and squeezes toward one side of the cross beam 101, thereby ensuring the sealing of the injection space 113. At the same time, the lower end of the side wall of the cross beam 101 abuts against the end 102 to ensure assembly accuracy.

[0036] In one embodiment, the main structure of the expansion beam 100 is formed by a glass fiber yarn resin pultrusion process, the outside of the expansion beam 100 is wrapped with a fiber cloth 114, and the inner wall of the expansion beam is coated with a unidirectional yarn 115, forming a three-layer stacked structure. The thickness ratio of the three-layer structure can be adjusted through performance analysis.

[0037] The raw material glass fiber resin material has the advantage of being lightweight and has insulation and anti-corrosion functions. It can eliminate the additional cost issues brought about by PC insulation boards, anti-corrosion coatings, etc. in the aluminum alloy solution.

[0038] The inner cavity of the expansion beam 100 is filled with a foaming material 116 formed by a foaming process, and the foaming material 116 is made of polyurethane.

[0039] In one implementation, an inner cavity with at least one end open is defined in the expansion beam 100 , and the foaming material 116 is filled into the inner cavity through the opening.

[0040] In one implementation, a plurality of inner cavities are disposed in the expansion beam 100 , and a plurality of injection ports corresponding to the inner cavities are opened on the expansion beam, and the foaming material 116 is filled into the inner cavities through the injection ports.

[0041] The use of polyurethane foam material can achieve foaming filling in the cavity of the pultruded expansion beam, thereby improving the expansion force resistance stiffness and NVH characteristics.

[0042] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A battery box pultruded expansion beam structure, It includes: It is characterized by: An expansion beam, comprising a cross beam and end portions bonded to the cross beam; Glue injection holes are provided on the crossbeam for glue injection; A limit strip is bonded to the end wall of the end portion of the beam and is used to limit the injection position; A fluid space is arranged in the limit strip, and the fluid space is filled with fluid rubber; The limiting strip includes: a side strip extending along the insertion direction of the cross beam and a bottom strip connected to one side of the side strip portion, a communicating fluid space is provided in the side strip and the bottom strip, and a sealing structure extending along the side strip and the bottom strip is provided on the side strip and the bottom strip, and the side wall of the sealing structure is relatively thin; The side strips, the bottom strips and the end heads are surrounded to form a glue injection space, the bottom strips are located on the side away from the cross beam, and the glue injection holes are located at the upper end of the glue injection space; The bottom strip comprises: a bag portion with an upwardly protruding end wall and connecting portions arranged on both sides of the bag portion and the side strips, and a buffer structure is arranged between the bag portion and the connecting portions; A step is provided on the inner wall of the beam, and the step abuts against the bag part, so that the fluid rubber in the bag part is squeezed into the side strips and the bottom strips, so that the sealing structure bulges and squeezes toward one side of the beam to ensure the sealing of the glue injection space.

2. A battery box pultruded expansion beam structure according to claim 1, characterized in that: The two side strips and the bottom strip surround to form a U-shaped space, the bottom strip is located at a side away from the cross beam, and the glue injection hole is located at the upper end of the U-shaped space.

3. A battery box pultruded expansion beam structure according to claim 2, characterized in that: The upper end of the side strip exceeds the end head and the exceeding part is provided with an inclined plate which is inclined toward the end head and the side wall of the beam respectively. One end of the two inclined plates is respectively connected to a side surface of the limit strip which is in contact with the end head and a side surface of the limit strip which is in contact with the beam.

4. A battery box pultruded expansion beam structure according to claim 3, characterized in that: The main structure of the expansion beam is formed by a pultrusion process, the outer side of the expansion beam is wrapped with fiber cloth, and the inner cavity wall of the expansion beam is covered with unidirectional yarn.

5. A battery box pultruded expansion beam structure according to claim 4, characterized in that: The inner cavity of the expansion beam is filled with foaming material formed by a foaming process.

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