Roll-in battery pack structure

Abstract

The utility model relates to the technical field of power batteries, in particular to a rolling battery pack structure which comprises a box body and further comprises a plurality of groups of battery modules which are all arranged in the box body; the box cover is fixedly mounted at the top of the box body through bolts; the bottom protection plate is welded with the box body through laser; the lifting lugs are mounted on the two sides of the box body; by adopting the rolling box body technology, laser welding and the innovative design of canceling rivet nuts and fixing bolts and the like, not only are the overall performance and the attractiveness of the box body improved, but also the structure of the whole bag is obviously optimized, the cost and the weight of the whole bag are reduced through the improvements, and the stability and the durability of the box body are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, concretely relates to a roll pressure battery package structure. BACKGROUND

[0002] Battery package is the integrated system that a plurality of electric core (battery monomer) is combined through specific design, contains electric core, module, battery management system (BMS) and high strength shell etc. core part, with the new policy, the requirement of national standard electric vehicle is more and more strict, especially small three-wheel and two-wheel car, many first-line city has forbidden its road travel, aiming at this phenomenon, a kind of battery package is used for small electric vehicle, and ensure that it has the ability of transporting hundred kilograms of goods.

[0003] The existing battery package manufacturing cost is high, and the overall extrusion resistance is low, which leads to insufficient side crash performance, and at the same time, the frame and the bottom plate are usually screwed, which is high in labor and material cost, and is not conducive to improving safety and reducing cost. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of roll pressure battery package structure to save labor cost, improve network security, to realize the above technical purpose, the technical scheme of the utility model is as follows:

[0005] A kind of roll pressure battery package structure, including box body, further comprising: battery module, the battery module is provided with several groups, and several groups of battery module are all arranged in the box body interior;Box cover, the box cover is fixedly installed on the box body top by bolt;Bottom guard plate, the bottom guard plate is welded with the box body by laser;Lifting lug, the lifting lug is installed on the both sides of box body.

[0006] Further limit, the box body is composed of roll pressure frame, front end beam, middle beam, rear end beam and side beam, the side beam is inlaid with U-shaped beam, the front end beam inside is provided with plug welding plate.

[0007] Further limit, the four corners of the box cover are all provided with L-shaped pressing sheet.

[0008] Further limit, the thick epoxy plate is provided below the battery module.

[0009] After improvement, the utility model further produces following beneficial effects:

[0010] 1, the utility model discloses a roll pressure box body technology, laser welding and cancel the pull rivet nut and fixed bolt etc. innovative design, not only improve the overall performance and aesthetic degree of box body, still significantly optimize the structure of whole package, these improvements not only reduce the cost and weight of whole package, also improve the stability and durability of box body.

[0011] 2. By adding an L-shaped pressure plate design at the corner of the box lid, not only is the problem of corner lifting caused by avoiding the weld bead solved, but the sealing performance of the box is also significantly improved. After long-term use and transportation, it can still maintain a good sealing state, effectively preventing potential problems such as moisture and oxidation of goods.

[0012] 3. The 1.5mm thick epoxy board placed under the module end plate not only ensures the flat fit between the module end plate and the rivet nut, but also effectively solves the problem of excessive temperature difference on one side caused by excessive heat dissipation at both ends of the module, providing a solid guarantee for the overall performance and lifespan of the module. Attached Figure Description

[0013] Figure 1 This is an assembly drawing of the present invention.

[0014] Figure 2 This is an assembly drawing from another perspective of the present invention.

[0015] Figure 3 This is an assembly drawing of the concealed box cover of this utility model.

[0016] Figure 4 This is an assembly diagram of the concealed battery module of this utility model.

[0017] Icons: 1. Box body; 2. Battery module; 3. Box cover; 4. Bottom protection plate; 5. Lifting lug. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figures 1-4 As shown, a roll-fed battery pack structure includes a housing 1, and further includes:

[0020] Battery module 2, wherein several sets of battery module 2 are provided, and all sets of battery module 2 are located inside the housing 1;

[0021] It should be noted that after the entire enclosure is welded, the surface is treated with electrophoresis to ensure the insulation of the entire enclosure. After electrophoresis, PVC is sprayed on the bottom of the enclosure to ensure that destructive objects such as stones splashed during vehicle operation will not scratch the electrophoretic paint on the surface of the enclosure, leading to corrosion and insulation failure. After the modules fall into the enclosure, they are fixed with long bolts (strength grade 10.9). The modules are connected with each other using module connecting plates to ensure the overall module is connected and increase the structural strength of the entire package.

[0022] Box cover 3, which is fixedly installed on the top of box body 1 by bolts;

[0023] It should be noted that the rivets on the roll forming frame are used for bolt fixing of the box cover. At the same time, the rivet nuts are glued so that the glue can seal the rivet surface after riveting, ensuring the airtightness of the box and meeting the IP68 requirement of the box.

[0024] In addition, a sealing ring is attached to the roller-pressed surface before the cover is installed. The effective pressing length of the inner side of the sealing ring is 6mm, ensuring that the entire battery pack is sealed to meet IP68 (preventing foreign objects and dust while meeting the requirement of water depth of 1m for 30 minutes without water ingress); different reinforcing ribs are opened on the top of the cover to ensure the structural strength of the entire cover during vehicle operation and prevent cracking caused by the cover jumping up and down.

[0025] Bottom protective plate 4, which is laser welded to the housing 1;

[0026] It should be noted that the bottom protective plate is laser-welded to the enclosure, which ensures the sealing performance of the entire enclosure and reduces its weight (by reducing the number of rivets and bolts).

[0027] Lifting lugs 5 are installed on both sides of the housing 1.

[0028] It should be noted that the lifting lugs use M10 bolts to enhance resistance to shear force during impact and improve the overall strength of the package;

[0029] In addition, electrical components are fixed to the BDU base plate using different types of bolts (different types of projection weld nuts are used on the BDU base plate), and the entire BDU base plate is fixed to the roll-formed steel using bolts (M6 rivet nuts are used on the roll-formed steel). According to the high-voltage circuit of the whole vehicle, copper busbars or aluminum busbars are used to connect the electrical components and modules to form a complete circuit.

[0030] The box body 1 is composed of a roll forming frame, a front beam, a middle beam, a rear beam, and side beams. The side beams are embedded with U-shaped beams, and the inner side of the front beams is provided with plug welding plates.

[0031] It should be noted that the roll-formed frame is welded as the basic frame of the battery pack (3 types of roll-formed end faces); a "U"-shaped sheet metal bending piece is added inside the side beam of the box and welded together with the side beam to enhance the side beam's ability to resist side collisions;

[0032] In addition, the middle beam adopts "convex" shaped roll-formed steel, which can support the module on both sides, with one beam serving two purposes. Welding plates are added to the inner side of the end beams for welding in two directions. Process holes are cut at the corners of the convex beam to prevent electrophoretic liquid from remaining in the roll-formed steel during the surface treatment of the box, which would cause uneven electrophoresis on the surface of the box.

[0033] L-shaped pressure plates are provided at all four corners of the box cover 3.

[0034] It should be noted that an L-shaped pressure plate is added at the corner of the box lid. Because the box lid avoids the weld, there is no flange at the corner. After the bolts are tightened, the corner will lift up, which may cause the entire package to lose its seal in the long run.

[0035] A thick epoxy board is installed below the battery module 2.

[0036] It should be noted that a 1.5mm thick epoxy board is placed under the module end plate. This serves two purposes: firstly, it is flush with the rivet nut, ensuring that the bottom of the module end plate is on a flat surface; secondly, it prevents the end plate from directly contacting the roll forming component (steel), which could cause excessive heat dissipation at both ends of the module and result in an excessively large temperature difference on one side.

[0037] The above provides a detailed description of a roll-fed battery pack structure provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its scope, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A roll-pressed battery pack structure comprising a box (1), characterized in that, Also include: Battery module (2), the battery module (2) is provided with several groups, and several groups of battery module (2) are arranged in the box (1) inside; The box cover (3) is fixedly installed on the top of the box (1) by bolts; The bottom guard plate (4) is welded with the box (1) by laser; The lifting lug (5) is installed on both sides of the box (1).

2. A roll-pressed battery pack structure according to claim 1, characterized by: The box (1) is composed of a rolling frame, a front end beam, a middle beam, a rear end beam and a side beam, the side beam is embedded with a U-shaped beam, and the inside of the front end beam is provided with a plug welding plate.

3. The roll-pressed battery pack structure of claim 1, wherein: The four corners of the box cover (3) are provided with L-shaped pressing sheets.

4. The roll-pressed battery pack structure of claim 1, wherein: The battery module (2) is provided below with a thick epoxy plate.

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