Energy-storage liquid-cooled battery pack with high energy density

Abstract

The utility model relates to a high energy density energy storage liquid cooling battery pack, which relates to the technical field of energy storage system battery packs, and comprises a lower box body, a battery module arranged on the lower box body, and an upper cover which covers the battery module and is connected with the lower box body, the edge of the front panel is provided with an inward-turned flange face structure so as to be detachably connected with the upper cover and the lower box body, and the open-type windowing structure is provided with an outward-turned flange sealing face so as to be detachably connected with the front panel. According to the utility model, the space is saved due to a smaller draft angle, demolding is facilitated due to a transition fillet structure, the sealing width is increased, the sealing performance is improved, the product quality is ensured by one-step molding, the system mass density is improved due to a lightweight design, low-cost material selection and high-efficiency mold molding are realized, and large-scale batch manufacturing is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage system battery pack technical field especially, it is a kind of high energy density energy storage liquid-cooled battery pack. BACKGROUND

[0002] In the traditional energy storage battery pack structure design, the common structure mode is mainly composed of lower box, panel and upper cover three parts, which jointly constitute a complete battery containing container.This design usually adopts low plane lower box, which is beneficial to the installation of battery module and subsequent maintenance work, also reduces the use of materials, makes structure more portable, lower cost, therefore, it is welcomed by industry designers.

[0003] However, this design also has some shortcomings. The upper cover overlaps with the panel in the vertical direction, and the upper cover flange face is sealed with the periphery of the lower box through a sealing pad in the same horizontal plane. Although this structure is light and low in cost, it is favored by industry designers, but this sealing surface occupies a certain space, and this part of space cannot be shared with other functions. In the case of limited space, this design limits the innovation and breakthrough of design.

[0004] In addition, the upper cover of the battery pack requires high requirements, and needs to surround the entire battery module to provide safety protection. The upper cover is usually made of sheet metal forming or mold forming plastic or metal material. The sheet metal forming upper cover has many welding points, which is easy to cause gas leakage, low yield and low forming efficiency, and the weight is relatively heavy. Although the plastic upper cover is light in weight and high in forming efficiency, it usually needs a 3 to 5 degree draft angle to facilitate forming and demolding. The larger the draft angle, the more space is wasted, which may cause the flange sealing surface to be too small to ensure the sealing performance. In order to ensure the sealing performance, it may be necessary to increase the outer boundary size, which will reduce the space utilization of the battery pack, further limiting the flexibility of design. UTILITY MODEL CONTENTS

[0005] The utility model aims at: provide a kind of high energy density energy storage liquid-cooled battery pack, ensure sealing performance while reducing the space occupied by sealing surface, improve the space utilization of battery pack.

[0006] In order to achieve the above purpose, the technical scheme of the utility model provides a kind of high energy density energy storage liquid-cooled battery pack, including lower box, battery module arranged on the lower box, and upper cover covering the battery module and being connected with the lower box, the side of the upper cover is open window structure of open type that can be equipped with front panel, the edge of the front panel is provided with inwardly turned flange surface structure to be detachably connected with the upper cover and the lower box, and the open window structure is provided with outwardly turned flange sealing surface of turn-up edge to be detachably connected with the front panel.

[0007] Preferably, the upper cover is provided with a continuous outwardly turned flange sealing surface.

[0008] Preferably, the front panel and the lower box are sealed by structural sealant or foamed silica gel pad.

[0009] Preferably, the flange sealing surface is provided with a pressing strip, the upper cover and the lower box are provided with an upper cover sealing pad, and the pressing strip is adapted to press the upper cover.

[0010] Preferably, the pressing strip is made of sheet metal material, and the pressing strip has a flange structure for strengthening the strength.

[0011] Preferably, the four sides of the upper cover are inclined surfaces, and the inclination angle is in the range of 1-1.5°.

[0012] Preferably, the inclination angle of the side surface of the front panel and the opposite side surface is 1°.

[0013] Preferably, the flange sealing surface and the adjacent inclined surface are smoothly connected through a transition fillet.

[0014] Preferably, the lower box is a flat plate type liquid cooling tray structure, and the inside is provided with a liquid cooling flow channel for battery heat dissipation.

[0015] Preferably, the inside of the lower box is provided with a reinforcing rib support structure to improve the overall strength, and the bottom of the lower box is provided with a heat preservation structure.

[0016] In summary, the utility model has the following beneficial technical effects:

[0017] The utility model has smaller draft angle to save space, transition fillet structure facilitates demolding, increased sealing width improves sealing performance, one-time forming guarantees product quality, lightweight design improves system mass density, low-cost material selection and high-efficiency mold forming, which is favorable for large-scale batch manufacturing. In addition, the inwardly turned front panel, the upper cover with smaller draft angle, the plastic upper cover and the thin lower box structure, and the movable front panel structure all help to improve space utilization, reduce weight, improve production efficiency and installation flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a high-energy-density energy storage liquid-cooled battery pack structure diagram of the utility model;

[0019] Figure 2 It is a high-energy-density energy storage liquid-cooled battery pack structure diagram of the utility model;

[0020] Figure 3The utility model discloses a high energy density energy storage liquid cooling battery pack middle front panel's structure schematic diagram.

[0021] Figure 4 The utility model discloses a high energy density energy storage liquid cooling battery pack middle transition fillet's structure schematic diagram.

[0022] Fig. 1, battery module;2, lower box body;3, upper cover;31, open slope;32, slope one;33, slope two;34, horizontal plane;35, slope three;36, flange sealing surface one of turn -up;37, flange sealing surface two of turn -up;38, flange sealing surface three of turn -up;39, flange sealing surface four of turn -up;310, transition fillet;310-1, arc angle one;310-2, arc angle two;4, pressing strip;5, front panel;51, flange face structure one;52, flange face structure two;53, flange face structure three;531, through -hole;6, upper cover sealing pad;7, reinforcing rib support structure;8, heat preservation structure. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0024] The utility model discloses a high energy density energy storage liquid cooling battery pack, it includes battery module 1, lower box body 2, upper cover 3, pressing strip 4, front panel 5 and upper cover sealing pad 6 and key components such as. Battery module 1 is located in the core position of energy storage liquid cooling battery pack, is placed in the upper of lower box body 2, and upper cover 3 covers the top of battery module 1, is connected with lower box body 2 through pressing strip 4 and bolt, and pressing strip 4 is shaped with the flange face of battery upper cover 3, and is pressed tightly to realize overall sealing to upper cover 3, and front panel 5 is as detachable movable panel, is connected with lower box body 2 through bolt, and upper cover sealing pad 6 is located between upper cover 3 and lower box body 2, plays the sealing effect.

[0025] The lower box body 2 adopts a flat plate type liquid cooling tray structure, and is internally designed with a liquid cooling flow channel. This design not only improves the heat dissipation efficiency, but also realizes the weight reduction and the improvement of the forming efficiency through the thin plate type structure integrally brazed. The lower box body 2 is further provided with a reinforcing rib support structure 7 and a heat preservation structure 8 at the inside and the bottom respectively, so as to further improve the overall strength and heat preservation performance of the battery pack, and ensure the performance stability of the battery under different environments. The heat preservation structure 8 can be selected from MPP, polyurethane foam or aerogel and other high-efficiency heat preservation materials, and the thickness thereof is controlled between 3 to 10 millimeters. The shape thereof is matched with the bottom structure of the battery pack, and a profiling design is adopted to achieve the best heat preservation effect. The battery module 1 is the core part of the battery pack, and cooperates with the lower box body 2 to ensure the stability and safety of the battery during operation.

[0026] The upper cover 3 can be made of plastic material, and is provided with a large-area open window structure. The upper cover 3 is composed of five surfaces. One side surface of the upper cover 3 is an open inclined surface 31. Two side surfaces adjacent to the open inclined surface 31 are inclined surface one 32 and inclined surface two 33 respectively. The side surface opposite to the open inclined surface 31 is inclined surface three 35. The top surface is a horizontal surface 34. The open inclined surface 31 has an inclination angle of 1.5°. The inclined surface one 32 and the inclined surface two 33 have an inclination angle of 1°. The inclined surface three 35 has an inclination angle of 1.5°. A horizontal reinforcing rib is arranged above the horizontal surface 34.

[0027] The bottom of the open inclined surface 31 is provided with three continuous outward flanging flanges, which correspond to form flanging flange sealing surface one 36, flanging flange sealing surface two 37 and flanging flange sealing surface three 38. Meanwhile, the inclined surface one 32, the inclined surface two 33 and the inclined surface three 35 are also provided with continuous outward flanging flanges at the bottom, which correspond to form flanging flange sealing surface four 39. The aforementioned outward flanging flanges of the upper cover 3 are distributed with hole positions. The flanging flange sealing surface and the adjacent inclined surface are connected smoothly through a transition fillet 310. The transition fillet 310 is a variable radius curved surface, which is composed of different arc angle one 310-1 and arc angle two 310-2.

[0028] The upper cover 3 adopts the transition fillet 310 at the position of the flanging flange, so that the product forming is easier, and a smaller draft angle of 1-1.5° is achieved, thereby saving more draft space. In addition, the variable curved surface transition fillet 310 between the flanging flange surface and the inclined surface not only facilitates demolding, but also increases the sealing width. From the original 3-5° draft angle to 1-1.5°, at least 67% of the demolding space is saved compared with the original design (for example, for a box cover with a depth of 200, a 1° draft angle can save more than 7mm of space size compared with a 3° draft angle).

[0029] The pressing strip 4 is a multi-section profiling structure, and is profiled with the flange surface of the upper cover 3 of the battery pack to press the upper cover 3 tightly to realize overall sealing. The pressing strip 4 is made of sheet metal material, has a flanging structure to strengthen the strength, and is not easy to deform. The upper cover gasket 6 is a profiling structure, and can be integrally formed or adopt a labyrinth type splicing structure to adapt to different installation requirements. The multi-section profiling structure of the pressing strip 4 and the profiling structure of the upper cover gasket 6 realize the overall sealing of the battery pack together. This design not only improves the sealing performance, but also adapts to different installation requirements and increases the flexibility of the product.

[0030] The front panel 5 is a detachable movable panel, and the front panel 5 is provided with a flange surface structure one 51 with inward flanging on both sides, a flange surface structure two 52 with inward flanging on the top, and a flange surface structure three 53 with inward flanging on the bottom. The flanging structures of the front panel 5 not only provide good sealing performance, but also provide more internal space for device installation, which helps to improve the capacity density of the battery pack in the case of limited space. The flange surface structure three 53 on the bottom of the front panel 5 is connected with the lower box body 2 through not less than 5 through holes 531 and bolts. The sealing between the front panel 5 and the lower box body 2 can adopt structural sealant or foamed silicone gasket sealing to ensure the sealing performance. The front panel 5 is an aluminum alloy die-casting structure, which is light and firm. The detachable movable panel design of the front panel 5 makes maintenance and replacement more convenient, and improves the practicability of the product.

[0031] As an optional embodiment, the utility model also can change the window position and shape structure of the upper cover 3, and select different materials and forming processes according to actual conditions to increase the adaptability and market competitiveness of the product.

[0032] The battery pack design of the utility model realizes the saving of space, the convenience of demolding, the improvement of sealing performance and the guarantee of product quality through the optimization of the draft angle, the adoption of the transition fillet 310 structure and the increase of the sealing width. The lightweight design and the selection of low-cost materials further improve the quality density of the system, reduce the manufacturing cost, and are beneficial to large-scale batch manufacturing.

[0033] Finally, it should be pointed out that: the above-mentioned is only preferred embodiment of the utility model, and is not used for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, still can modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part of technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A high-energy-density liquid-cooled battery pack for energy storage, characterized in that, It includes a lower housing (2), a battery module (1) disposed on the lower housing (2), and an upper cover (3) covering the battery module (1) and connected to the lower housing (2). One side of the upper cover (3) is an open window structure on which a front panel (5) can be installed. The edge of the front panel (5) is provided with an inwardly folded flange structure to be detachably connected to the upper cover (3) and the lower housing (2). The open window structure is provided with an outwardly folded flange sealing surface to be detachably connected to the front panel (5).

2. The high energy density liquid-cooled battery pack according to claim 1, characterized in that, The upper cover (3) is provided with a continuous outward-turning flange sealing surface around its perimeter.

3. A high-energy-density liquid-cooled battery pack for energy storage according to claim 2, characterized in that, The front panel (5) and the lower housing (2) are sealed together by structural sealant or foamed silicone gasket.

4. A high-energy-density liquid-cooled battery pack for energy storage according to claim 2, characterized in that, A pressure strip (4) is provided on the sealing surface of the flange, and an upper cover sealing gasket (6) is provided between the upper cover (3) and the lower box (2). The pressure strip (4) is adapted to and presses the upper cover (3).

5. A high-energy-density liquid-cooled battery pack according to claim 4, characterized in that, The pressure strip (4) is made of sheet metal and has a flange structure for strengthening.

6. A high-energy-density liquid-cooled battery pack according to claim 2, characterized in that, The top cover (3) has four sloping sides.

7. A high-energy-density liquid-cooled battery pack for energy storage according to claim 6, characterized in that, The inclination angle of the inclined plane ranges from 1 to 1.

5.

8. A high-energy-density liquid-cooled battery pack for energy storage according to claim 6, characterized in that, The flange sealing surface and the adjacent bevel are smoothly connected by a transition fillet (310).

9. A high-energy-density liquid-cooled battery pack for energy storage according to claim 1, characterized in that, The lower housing (2) is a flat liquid-cooled tray structure, and its interior is provided with liquid-cooled channels for battery heat dissipation.

10. A high-energy-density liquid-cooled battery pack for energy storage according to claim 1, characterized in that, The lower box (2) is provided with a reinforcing rib support structure (7) inside, and the bottom of the lower box (2) is provided with a heat insulation structure (8).

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