Electric vehicle battery pack lower shell frame

Abstract

A lower shell frame of a battery pack of an electric vehicle comprises a left frame, a right frame, a front frame, a rear frame, transverse reinforcing ribs and longitudinal reinforcing ribs, the left frame, the right frame, the front frame and the rear frame define a rectangular frame, and the transverse reinforcing ribs and the longitudinal reinforcing ribs are located in the rectangular frame; the inner side walls of the front end and the rear end of the left frame and the inner side walls of the rear end of the right frame are used for blocking the left end and the right end of the front frame; the left frame and the right frame are composed of a first rolling profile and a second rolling profile, the first rolling profile and the second rolling profile are both of a steel rolling forming structure and are connected into a whole through matching of an embedded structure and a welding mode, and the first rolling profile is located on the inner side of the second rolling profile. According to the utility model, the steel battery pack lower shell structure is optimally designed, so that the steel battery pack lower shell structure conforms to the idea of light weight of vehicles, and the purposes of reducing the production cost and improving the anti-collision performance of the battery pack shell are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy electric vehicles, in particular to a steel roll-pressed battery pack lower shell frame capable of improving the side collision performance of electric vehicles. Background Art

[0002] As environmental pollution and energy issues become increasingly prominent, the development of new energy vehicles is an effective way to solve the above problems. In the overall structure of new energy electric vehicles, the weight of the battery pack accounts for about 30% of the vehicle's curb weight, and the weight of the lower shell of the battery pack accounts for about 20%-30% of the battery pack weight. Therefore, a lightweight and low-cost structural design for the lower shell of the battery pack is of great significance for reducing the production cost of electric vehicles and increasing their cruising range.

[0003] At present, some brands of electric vehicles use aluminum alloy battery pack shells. Although this is conducive to the design concept of lightweight vehicles, its high production cost has limited its large-scale promotion and application to a certain extent. High-strength steel has the advantages of low cost, high strength, good mechanical properties, and mature manufacturing technology. Through the optimized design of the lower shell structure of the steel battery pack, it can reduce its own weight while ensuring strength, improve the anti-collision performance of the battery pack shell, and promote the development of electric vehicle technology. Utility Model Content

[0004] The utility model provides a lower shell frame of an electric vehicle battery pack, aiming to optimize the design of the lower shell structure of a steel battery pack to make it conform to the concept of vehicle lightweight, thereby achieving the purpose of reducing production costs and improving the anti-collision performance of the battery pack shell.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lower shell frame of an electric vehicle battery pack comprises left and right frames, front and rear frames, transverse reinforcing ribs and longitudinal reinforcing ribs, wherein the left and right frames and the front and rear frames enclose a rectangular frame, and the transverse reinforcing ribs and the longitudinal reinforcing ribs are located inside the rectangular frame; the special feature of the invention is that the front and rear frames are located between the left and right frames, and the left and right ends of the front and rear frames are blocked by the inner side walls at the front and rear ends of the left and right frames; the left and right frames are composed of a first roll-formed profile and a second roll-formed profile, both of which are steel roll-formed structures, and the two are connected as a whole through an embedded structure and welding, and the first roll-formed profile is located on the inner side of the second roll-formed profile.

[0007] The above-mentioned lower shell frame of the electric vehicle battery pack, the first rolled profile is a cavity-type long strip rod, and the edges on both sides are folded inward after roll-forming, and a closed polygonal cross-sectional structure is formed by welds a and b, and a downward boss is provided on the bottom surface of the first rolled profile; the second rolled profile is a cavity-type long strip rod, and the edges on both sides are butt-jointed after roll-forming, and a closed polygonal cross-sectional structure is formed by welds c, an inclined connecting surface is provided on the outer side of the bottom surface of the second rolled profile, and a downward groove is provided on the upper end surface of the second rolled profile, and the downward boss of the first rolled profile is embedded in the downward groove of the second rolled profile.

[0008] In the above-mentioned lower shell frame of the electric vehicle battery pack, the first rolled profile and the second rolled profile are welded into one body through the first connecting position and the second connecting position.

[0009] The above-mentioned lower shell frame of the electric vehicle battery pack, the first rolled profile is a cavity-type long strip rod, the edges of which are butt-jointed on both sides after roll-forming, and a closed polygonal cross-sectional structure is formed by weld d, and an inward groove is provided on the outer side of the first rolled profile; the second rolled profile is a cavity-type long strip rod, the edges of which are folded inwardly after roll-forming, and a closed polygonal cross-sectional structure is formed by weld e and weld f, and an inward boss is provided on the inner side of the second rolled profile, and the inward boss is embedded in the inward groove of the first rolled profile.

[0010] In the above-mentioned lower shell frame of the electric vehicle battery pack, the first rolled profile and the second rolled profile are welded into one body through the third connecting position and the fourth connecting position.

[0011] The lower shell frame of the electric vehicle battery pack is provided with a plurality of sleeves matching the mounting shell fixing bolts on the second rolled profiles of the left and right frames, and the sleeves are evenly distributed along the axial direction of the left and right frames.

[0012] In the lower shell frame of the electric vehicle battery pack, the two ends of the transverse reinforcing ribs are fixedly connected to the left and right frames, and the longitudinal reinforcing ribs are fixedly connected between two adjacent groups of transverse reinforcing ribs.

[0013] The lower shell frame of the electric vehicle battery pack, the left and right frames, the front and rear frames, the transverse reinforcing ribs and the longitudinal reinforcing ribs are all roll-formed by steel plates with a thickness of 1.2mm-15mm.

[0014] The utility model provides a lower shell frame of an electric vehicle battery pack, which optimizes the design of left and right frame structures and forms a steel profile with a cavity structure by using roll forming and welding processes, thereby not only ensuring the strength of the lower shell of the battery pack and reducing its own weight, but also absorbing the collision energy through the collapse and deformation of a second roll-formed profile located outside the left and right frames when a side collision occurs to the vehicle, thereby improving the side collision resistance of the battery pack shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the lower housing frame of the electric vehicle battery pack described in the utility model;

[0016] Figure 2 is a schematic structural diagram of a first embodiment of a cross section of left and right frames;

[0017] Figure 3 yes Figure 2 Decomposition structure diagram of

[0018] Figure 4 is a structural schematic diagram of a second embodiment of a cross section of left and right frames;

[0019] Figure 5 yes Figure 4 Decomposition structure diagram of .

[0020] Explanation of the symbols in the figure:

[0021] 1 is the left and right frames, 1-1 is the first rolled profile, 1-1-1 is the downward boss, 1-1-2 is the inward groove, 1-2 is the second rolled profile, 1-2-1 is the downward groove, 1-2-2 is the inclined connecting surface, and 1-2-3 is the inward boss; 2 is the front and rear frames; 3 is the transverse reinforcement rib; 4 is the longitudinal reinforcement rib; 5 is the sleeve;

[0022] Ⅰ is the first connection position, Ⅱ is the second connection position, Ⅲ is the third connection position, and Ⅳ is the fourth connection position. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] See Figure 1. Figure 2 , Figure 4The utility model provides a lower shell frame of an electric vehicle battery pack, which includes left and right frames 1, front and rear frames 2, transverse reinforcing ribs 3 and longitudinal reinforcing ribs 4. The left and right frames 1 and the front and rear frames 2 are enclosed to form a rectangular frame. The front and rear frames 2 are located between the left and right frames 1. The left and right ends of the front and rear frames 2 are blocked by the inner side walls at the front and rear ends of the left and right frames 1. The transverse reinforcing ribs 3 and the longitudinal reinforcing ribs 4 are located inside the rectangular frame. The two ends of the transverse reinforcing ribs 3 are fixedly connected to the left and right frames 1, and the longitudinal reinforcing ribs 4 are fixedly connected between two adjacent groups of transverse reinforcing ribs 3. The utility model is special in that the left and right frames 1, the front and rear frames 2, the transverse reinforcing ribs 3 and the longitudinal reinforcing ribs 4 are all roll-formed by steel plates with a thickness of 1.2mm-15mm. The left and right frames 1 are composed of a first roll-formed profile 1-1 and a second roll-formed profile 1-2. The first roll-formed profile 1-1 and the second roll-formed profile 1-2 are connected as a whole by an embedded structure and a welding method. The first roll-formed profile 1-1 is located on the inner side of the second roll-formed profile 1-2.

[0025] See also Figure 2 , Figure 3 The lower shell frame of the electric vehicle battery pack described in the utility model has a first specific embodiment as follows: the first rolled profile 1-1 is a cavity-type long strip rod, and after roll-forming, the edges on both sides are folded inward, and a closed polygonal cross-sectional structure is formed by weld a and weld b, and weld a and weld b are both laser welds, thereby meeting the airtightness requirements of the frame. In this embodiment, a downward boss 1-1-1 is provided on the bottom surface of the first rolled profile 1-1; the second rolled profile 1-2 is a cavity-type long strip rod, and after roll-forming, the edges on both sides are butt-jointed, and a closed polygonal cross-sectional structure is formed by weld c. Since the second rolled profile 1-2 is located at There is no airtightness requirement on the outer side of the left and right frames 1, so the weld c can be welded by relatively low-cost roller spot welding. In this embodiment, an inclined connecting surface 1-2-2 is provided on the outer side of the bottom surface of the second rolled profile 1-2, and a downward groove 1-2-1 is provided on the upper end surface of the second rolled profile 1-2. The downward boss 1-1-1 of the first rolled profile 1-1 is embedded in the downward groove 1-2-1 of the second rolled profile 1-2; in this embodiment, the first rolled profile 1-1 and the second rolled profile 1-2 are welded together through the first connecting position I and the second connecting position II, and arc welding is used for connection at the first connecting position I and the second connecting position II.

[0026] See also Figure 4 , Figure 5The lower shell frame of the electric vehicle battery pack described in the utility model, its second specific embodiment is: the first rolled profile 1-1 is a cavity-type long strip rod, and the edges on both sides are butt-jointed after roll-forming, and a closed polygonal cross-sectional structure is formed by a weld d, and the weld d is a rolling point weld. In this embodiment, an inward groove 1-1-2 is provided on the outer side of the first rolled profile 1-1; in this embodiment, the second rolled profile 1-2 is a cavity-type long strip rod, and the edges on both sides are folded inward after roll-forming, and a closed polygonal cross-sectional structure is formed by a weld e and weld f form a closed polygonal cross-sectional structure, weld e is a laser weld, weld f is a rolling point weld, and an inward boss 1-2-3 is provided on the inner side surface of the second rolled profile 1-2, and the inward boss 1-2-3 is embedded in the inward groove 1-1-2 of the first rolled profile 1-1; in this embodiment, the first rolled profile 1-1 and the second rolled profile 1-2 are welded into one through the third connection position III and the fourth connection position IV, and the third connection position III and the fourth connection position IV are welded by intermittent MAG welding.

Claims

1. A lower housing frame of an electric vehicle battery pack, comprising left and right frames (1), front and rear frames (2), transverse reinforcing ribs (3) and longitudinal reinforcing ribs (4), wherein the left and right frames (1) and the front and rear frames (2) are enclosed to form a rectangular frame, and the transverse reinforcing ribs (3) and longitudinal reinforcing ribs (4) are located inside the rectangular frame; characterized in that: The front and rear frames (2) are located between the left and right frames (1), and the left and right ends of the front and rear frames (2) are blocked by the inner side walls at the front and rear ends of the left and right frames (1); the left and right frames (1) are composed of a first roll-formed profile (1-1) and a second roll-formed profile (1-2); both the first roll-formed profile (1-1) and the second roll-formed profile (1-2) are steel roll-formed structures, and the two are connected as a whole by means of an embedded structure and welding, and the first roll-formed profile (1-1) is located on the inner side of the second roll-formed profile (1-2).

2. The lower housing frame of the electric vehicle battery pack according to claim 1, characterized in that: The first rolled profile (1-1) is a hollow long strip rod, and after roll forming, the edges on both sides are folded inwards, and a closed polygonal cross-sectional structure is formed by welds a and b, and a downward boss (1-1-1) is provided on the bottom surface of the first rolled profile (1-1); the second rolled profile (1-2) is a hollow long strip rod, and after roll forming, the edges on both sides are butt-jointed, and a closed polygonal cross-sectional structure is formed by welds c, an inclined connecting surface (1-2-2) is provided on the outer side of the bottom surface of the second rolled profile (1-2), and a downward groove (1-2-1) is provided on the upper end surface of the second rolled profile (1-2), and the downward boss (1-1-1) of the first rolled profile (1-1) is embedded in the downward groove (1-2-1) of the second rolled profile (1-2).

3. The lower housing frame of the electric vehicle battery pack according to claim 2, characterized in that: The first rolled profile (1-1) and the second rolled profile (1-2) are welded into one piece via a first connection position (I) and a second connection position (II).

4. The lower housing frame of the electric vehicle battery pack according to claim 1, characterized in that: The first rolled profile (1-1) is a hollow long strip rod, and after roll forming, the edges on both sides are butted together and a closed polygonal cross-sectional structure is formed by a weld d, and an inward groove (1-1-2) is provided on the outer side surface of the first rolled profile (1-1); the second rolled profile (1-2) is a hollow long strip rod, and after roll forming, the edges on both sides are folded inwardly and a closed polygonal cross-sectional structure is formed by welds e and f, and an inward boss (1-2-3) is provided on the inner side surface of the second rolled profile (1-2), and the inward boss (1-2-3) is embedded in the inward groove (1-1-2) of the first rolled profile (1-1).

5. The lower housing frame of the electric vehicle battery pack according to claim 4, characterized in that: The first rolled profile (1-1) and the second rolled profile (1-2) are welded into one piece via a third connection position (III) and a fourth connection position (IV).

6. The lower housing frame of the electric vehicle battery pack according to any one of claims 1 to 5, characterized in that: A plurality of sleeves (5) matching the mounting housing fixing bolts are arranged on the second rolled profiles (1-2) of the left and right frames (1); the sleeves (5) are evenly distributed axially along the left and right frames (1).

7. The lower housing frame of the electric vehicle battery pack according to any one of claims 1 to 5, characterized in that: The two ends of the transverse reinforcing ribs (3) are fixedly connected to the left and right frames (1), and the longitudinal reinforcing ribs (4) are fixedly connected between two adjacent groups of transverse reinforcing ribs (3).

8. The lower housing frame of the electric vehicle battery pack according to any one of claims 1 to 5, characterized in that: The left and right frames (1), the front and rear frames (2), the transverse reinforcing ribs (3) and the longitudinal reinforcing ribs (4) are all formed by roll forming of steel plates with a thickness of 1.2 mm to 15 mm.

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