Buffering and energy-absorbing battery pack bottom protection plate structure and battery pack

Abstract

The utility model discloses a buffering and energy-absorbing battery pack bottom protective plate structure and a battery pack, which comprise an upper layer plate, a lower layer plate, a plurality of upper layer plate reinforcing ribs and a plurality of lower layer plate reinforcing ribs, a plurality of lower-layer plate reinforcing ribs are arranged on the upper surface of the lower-layer plate along a second direction intersected with the first direction; wherein a notch is formed in the upper-layer plate reinforcing rib or the lower-layer plate reinforcing rib; wherein the shape of the upper layer plate reinforcing rib is matched with the shape of the notch, or the shape of the lower layer plate reinforcing rib is matched with the shape of the notch; wherein a first gap is formed between the upper-layer plate and the lower-layer plate. According to the utility model, the combined profile flat plates are integrated, so that the Z-direction height of parts is reduced compared with an integrally extruded profile bottom guard plate.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a buffering and energy-absorbing battery pack bottom guard plate structure. Background Art

[0002] With the continuous popularization and improvement of new energy technologies, the market share of new energy electric vehicles is getting higher and higher. At the same time, with the continuous improvement of environmental protection efforts, electric vehicles have been developed to a great extent. In electric vehicle systems, the safety of on-board battery packs is particularly important, especially the lower shell of the battery pack as the main protective structure of the battery system, which provides safety protection for the power battery. The most common battery pack system currently available is composed of aluminum profile frame, brazed liquid cooling plate, battery cell and other parts. The lateral protection of the battery mainly relies on the aluminum profile frame, and the protection of the bottom of the battery pack mainly relies on the bottom guard plate.

[0003] The probability of the battery pack being hit by a side collision during normal driving of the car is very small. The collision and impact during normal driving mainly come from the bottom of the battery pack system. Therefore, bottom protection of the battery pack system is particularly important.

[0004] There are mainly the following types of existing battery pack bottom guard plates. One is an extruded profile cavity structure, and the other bottom guard plate uses a stamped steel plate. This stamped steel plate, however, has obvious disadvantages. The extruded profile bottom guard plate is limited by the extrusion profile process, and the thickness of the bottom guard plate must be controlled within the corresponding size, but this is limited by the battery pack envelope size. The other stamped steel plate bottom guard plate is generally used in combination with a brazed liquid cooling plate when the battery pack system is integrated. When this structure is subjected to external impact, the liquid cooling plate flow channel will be squeezed, thereby affecting the overall cooling performance of the battery pack. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a buffering and energy-absorbing battery pack bottom guard plate structure.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A buffering and energy absorbing battery pack bottom guard plate structure, comprising:

[0008] An upper plate, wherein a plurality of upper plate reinforcing ribs are arranged on the lower surface of the upper plate along a first direction;

[0009] A lower plate, wherein a plurality of lower plate reinforcing ribs are arranged on the upper surface of the lower plate along a second direction intersecting the first direction;

[0010] Wherein, a notch is provided on the upper plate reinforcement rib or the lower plate reinforcement rib;

[0011] Wherein, the shape of the upper plate reinforcement rib matches the shape of the notch, or the shape of the lower plate reinforcement rib matches the shape of the notch;

[0012] Wherein, there is a first gap between the upper plate and the lower plate.

[0013] The above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, wherein the upper plate reinforcement rib or the lower plate reinforcement rib has at least one reinforcement rib slope, the notch correspondingly has a notch slope, and the reinforcement rib slope abuts against the notch slope.

[0014] In the above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, the cross-sections of the upper plate reinforcement ribs and the lower plate reinforcement ribs are both trapezoidal.

[0015] The above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, wherein there is a second gap between the upper surface of the lower plate reinforcement rib and the lower surface of the upper plate, and between the upper plate reinforcement rib and the upper surface of the lower plate.

[0016] In the above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, the lower plate reinforcement ribs are interference fit with the notch.

[0017] The above-mentioned buffer and energy-absorbing battery pack bottom guard plate structure, wherein the first direction is perpendicular to the second direction;

[0018] It includes a plurality of upper plate reinforcing ribs arranged in parallel, and a plurality of lower plate reinforcing ribs arranged in parallel;

[0019] Each of the upper plate reinforcing ribs is provided with a plurality of notches.

[0020] The above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, wherein the size of the outer edge of the lower plate is smaller than the size of the outer edge of the upper plate, so as to form an annular blank area at the outer edge of the upper plate.

[0021] The above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, wherein the upper plate and / or the lower plate are also provided with a plurality of positioning pins.

[0022] In the above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, the size of the outer edge of the lower plate is smaller than the size of the outer edge of the upper plate, so as to form an annular blank area at the outer edge of the upper plate.

[0023] The above-mentioned buffering and energy-absorbing battery pack bottom guard plate structure, the upper plate and / or the lower plate are also provided with a plurality of positioning pins.

[0024] A battery pack, comprising any one of the above buffer and energy absorbing battery pack bottom guard plate structures, and further comprising:

[0025] Profile frame;

[0026] a liquid cooling plate disposed at the lower end of the profile frame;

[0027] A battery cell is arranged in the profile frame, and the lower end of the battery cell is attached to the liquid cooling plate;

[0028] Wherein, the upper plate is arranged below the liquid cooling plate, and the lower plate is arranged below the upper plate.

[0029] In the above-mentioned battery pack, the profile frame and the liquid cooling plate are connected by arranging a stirring welding bead.

[0030] Due to the adoption of the above technology, the utility model has the following positive effects compared with the prior art:

[0031] (1) The utility model adopts a combined profile flat plate for integration, which reduces the Z-direction height of the parts compared to the integral extruded profile bottom guard plate.

[0032] (2) The bottom guard plate of the utility model adopts upper and lower two kinds of reinforcing rib profile flat plates, which are integrated through mortise and tenon interference fits through the reinforcing rib openings on the profile flat plates. The criss-crossing reinforcing ribs increase the structural strength of the bottom guard plate system, and a certain amount of space margin is left at the fitting position, which serves as an energy absorption buffer space when the bottom guard plate is subjected to external excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 , Figure 2 It is an exploded schematic diagram of the buffer and energy-absorbing battery pack bottom guard plate structure of the utility model.

[0034] Figure 3 It is a schematic diagram of the lower plate of the buffer and energy-absorbing battery pack bottom guard plate structure of the utility model.

[0035] Figure 4 The utility model is a buffer and energy absorption battery pack bottom guard plate structure Figure 3 A partial enlarged schematic diagram of .

[0036] Figure 5 It is a schematic diagram of the upper plate of the buffer and energy-absorbing battery pack bottom guard plate structure of the utility model.

[0037] Figure 6 The utility model is a buffer and energy absorption battery pack bottom guard plate structure Figure 5 A partial enlarged schematic diagram of .

[0038] Figure 7 It is a schematic diagram of the coordination of the upper plate and the lower plate of the buffer and energy-absorbing battery pack bottom guard plate structure of the utility model.

[0039] In the attached figure: 1. upper plate; 11. upper plate reinforcement rib; 2. lower plate; 12. lower plate reinforcement rib; 3. notch; 4. profile frame; 5. liquid cooling plate; 6. positioning pin. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front”, “back”, “lateral” and “vertical” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0042] It should be specially explained that the terms “horizontal” and “vertical” in the present invention are used to illustrate a rough positional relationship, rather than a strict “horizontal plane” or “vertical plane”.

[0043] See also Figures 1 to 7 As shown, a preferred embodiment of a buffer and energy-absorbing battery pack bottom guard plate structure is shown, including: an upper plate 1 and a lower plate 2, wherein the lower surface of the upper plate 1 is arranged with a plurality of upper plate reinforcing ribs 11 along a first direction; the upper surface of the lower plate 2 is arranged with a plurality of lower plate reinforcing ribs 21 along a second direction intersecting with the first direction; wherein, a notch 3 is provided on the upper plate reinforcing rib 11 or on the lower plate reinforcing rib 21; wherein, the shape of the upper plate reinforcing rib 11 matches the shape of the notch 3, or the shape of the lower plate reinforcing rib 21 matches the shape of the notch 3; wherein, there is a first gap between the upper plate 1 and the lower plate 2.

[0044] Specifically, in the present embodiment, a notch 3 is formed on the upper plate reinforcing rib 11 , and the shape of the lower plate reinforcing rib 21 matches the notch 3 and can be embedded in the notch 3 .

[0045] Furthermore, as a preferred embodiment, the upper plate reinforcement rib 11 or the lower plate reinforcement rib 21 has at least one reinforcement rib inclined surface, and the notch 3 correspondingly has a notch inclined surface, and the reinforcement rib inclined surface abuts against the notch inclined surface.

[0046] Specifically, in this embodiment, the rib slope of the lower plate reinforcement rib 21 is arranged to be inclined relative to the upper surface of the lower plate 2 .

[0047] Specifically, the lower plate reinforcement rib 21 may have two symmetrically arranged reinforcement rib inclined surfaces, or one side may be a reinforcement rib inclined surface and the other side may be a straight surface perpendicular to the upper surface of the lower plate 2 .

[0048] In the drawings of this embodiment, a situation is provided in which the lower plate reinforcement rib 21 has two symmetrically arranged reinforcement rib inclined surfaces.

[0049] Furthermore, as a preferred embodiment, the cross-sections of the upper plate reinforcement ribs 11 and the lower plate reinforcement ribs 21 are both trapezoidal.

[0050] Specifically, the waists on both sides of the trapezoid form the above-mentioned reinforcing rib inclined surfaces. More specifically, the trapezoid can be an isosceles trapezoid.

[0051] Furthermore, as a preferred embodiment, there is a second gap between the upper surface of the lower plate reinforcement rib 21 and the lower surface of the upper plate 1 , and between the upper plate reinforcement rib 11 and the upper surface of the lower plate 2 .

[0052] Specifically, the second gap provides a floating space between the upper plate 1 and the lower plate 2 .

[0053] It should be particularly pointed out that in this embodiment, a profile extrusion process is adopted to extrude the upper plate 1 and the lower plate 2 of the bottom guard plate respectively, and a plurality of trapezoidal reinforcing ribs are designed on the upper plate 1 and the lower plate 2 respectively, so as to eliminate the problem that extrusion cannot be achieved due to the profile height.

[0054] Furthermore, as a preferred embodiment, the lower plate reinforcement rib 21 and the notch 3 are interference fit.

[0055] Further, as a preferred embodiment, the first direction is perpendicular to the second direction. For example, the upper plate reinforcement rib 11 extends along the width direction of the upper plate 1 , and the lower plate reinforcement rib 21 extends along the length direction of the lower plate 2 .

[0056] Further, as a preferred embodiment, see Figure 3 , Figure 5 As shown, it includes a plurality of upper plate reinforcing ribs 11 arranged in parallel, and a plurality of lower plate reinforcing ribs 21 arranged in parallel.

[0057] Furthermore, as a preferred embodiment, in this embodiment, the notches 3 are arranged on the upper plate reinforcement ribs 11 , and each upper plate reinforcement rib 11 is provided with a plurality of notches 3 .

[0058] More specifically, the upper plate 1 and the lower plate 2 of the bottom guard plate are connected by mortise and tenon joints, a notch 3 is opened on the upper plate 1 using CNC technology, and an interference fit is adopted between the upper plate 1 and the lower plate 2. After assembly, a buffer space of a certain size is left at the joint of the upper plate 1 and the lower plate 2 as a collision energy absorption structure, and the reinforcing ribs of the upper plate 1 and the lower plate 2 are distributed in a criss-cross pattern. This structural design can avoid the problem that the stamped bottom plate cannot absorb energy under collision conditions.

[0059] Furthermore, as a preferred embodiment, the size of the outer edge of the lower plate 2 is smaller than the size of the outer edge of the upper plate 1 , so as to form an annular blank area at the outer edge of the upper plate 2 .

[0060] Specifically, the lower plate 2 of the bottom guard plate is cut along the edge area, thereby leaving a blank area of ​​a certain size on the upper plate 1, which can facilitate the system integration of the bottom guard plate system, frame, and fastening bolts.

[0061] Furthermore, as a preferred embodiment, a plurality of positioning pins 6 are provided on the upper plate 1 and / or the lower plate 2 .

[0062] Specifically, the positioning pin has a columnar structure, especially a cylindrical structure.

[0063] Furthermore, as a preferred embodiment, a battery pack is provided, which includes: a profile frame 4, a liquid cooling plate 5 arranged at the lower end of the profile frame 4, and a battery cell arranged in the profile frame 4; wherein the lower end of the battery cell is attached to the liquid cooling plate 5; wherein the upper plate 1 is arranged below the liquid cooling plate 5, and the lower plate 2 is arranged below the upper plate 1.

[0064] Furthermore, as a preferred embodiment, the profile frame 4 and the liquid cooling plate 5 are connected by arranging a stirring welding bead.

[0065] Specifically, the connection of the stirring welding bead can not only realize the structural connection, but also seal the internal space of the box.

[0066] The bottom guard plate structure designed by the utility model can avoid the limitation of the profile bottom guard plate due to the thickness of the profile, and can also avoid the problem that the stamped bottom guard plate cannot absorb energy when it is hit or impacted, thereby solving the design disadvantages of the bottom guard plate being limited by the process and structure.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A buffering and energy-absorbing battery pack bottom guard plate structure, characterized in that: include: An upper plate, wherein a plurality of upper plate reinforcing ribs are arranged on the lower surface of the upper plate along a first direction; a lower plate, wherein a plurality of lower plate reinforcing ribs are arranged on an upper surface of the lower plate along a second direction intersecting the first direction; Wherein, a notch is provided on the upper plate reinforcement rib or the lower plate reinforcement rib; Wherein, the shape of the upper plate reinforcement rib matches the shape of the notch, or the shape of the lower plate reinforcement rib matches the shape of the notch; Wherein, there is a first gap between the upper plate and the lower plate.

2. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, characterized in that: The upper plate reinforcement rib or the lower plate reinforcement rib has at least one reinforcement rib inclined surface, and the notch has a notch inclined surface correspondingly, and the reinforcement rib inclined surface abuts against the notch inclined surface.

3. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, characterized in that: The cross sections of the upper plate reinforcement ribs and the lower plate reinforcement ribs are both trapezoidal.

4. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, characterized in that: There is a second gap between the upper surface of the lower plate reinforcement rib and the lower surface of the upper plate, and between the upper plate reinforcement rib and the upper surface of the lower plate.

5. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, wherein the lower plate reinforcement rib and the notch are interference fit.

6. The buffer and energy-absorbing battery pack bottom guard structure according to claim 1, wherein the first direction is perpendicular to the second direction; The invention comprises a plurality of upper plate reinforcement ribs arranged in parallel, and a plurality of lower plate reinforcement ribs arranged in parallel; Each upper plate reinforcement rib is provided with a plurality of notches.

7. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, wherein the outer edge of the lower plate is smaller than the outer edge of the upper plate, so as to form an annular blank area at the outer edge of the upper plate.

8. The buffer and energy-absorbing battery pack bottom guard plate structure according to claim 1, wherein the upper plate and / or the lower plate are further provided with a plurality of positioning pins.

9. A battery pack, characterized in that: The buffer and energy-absorbing battery pack bottom guard plate structure according to any one of claims 1 to 8 further comprises: Profile frame; a liquid cooling plate provided at the lower end of the profile frame; A battery cell is provided in the profile frame, wherein the lower end of the battery cell is attached to the liquid cooling plate; The upper plate is arranged below the liquid cooling plate, and the lower plate is arranged below the upper plate.

10. The battery pack according to claim 9, characterized in that: The profile frame and the liquid cooling plate are connected by arranging a stirring welding bead.

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