Battery pack liquid cooling box body structure

Abstract

The utility model discloses a kind of battery pack liquid cooling box structure, it is related to automobile / vehicle new energy technical field, to solve the heat transfer of cell bottom can cause cell temperature unevenness to cause heat exchange efficiency slow, the existing problem of needing to increase liquid cooling pipeline inside battery box;Including box and aerogel pad, liquid cooling plate, square shell cell;Square shell cell adopts horizontal arrangement, two rows are a group, ensure that every square shell cell has a maximum side surface and liquid cooling plate contact, reduce square shell cell temperature difference and improve heat dissipation efficiency, two rows square shell cell inside is provided with aerogel pad, insulate the heat between square shell cell between two rows, and play flame-retardant role when square shell cell is on fire.Box side plate is used as a part of flow channel loop, cancel the design of liquid cooling pipeline in box, effectively reduce the size of battery pack box, improve battery pack energy density, in the case where without cooling heating, fluid passage existing in box side plate interior can also play the role of heat insulation with external environment.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology for automobiles / locomotives, and in particular to a liquid-cooled housing structure for a battery pack. Background Technology

[0002] Current automotive and rail vehicle power battery packs must meet the requirements of high-rate discharge and operation in extreme high and low temperature environments. This makes cell temperature control particularly crucial, especially during continuous charge-discharge cycles at high temperatures and rapid vehicle start-up in low temperatures. Typical liquid-cooled battery packs place the liquid cooling plate at the bottom of the cells, but heat transfer from the bottom leads to uneven temperature distribution within the cells, resulting in slow heat exchange efficiency. Alternatively, heat dissipation may occur on the sides of the cells, but this requires increasing the space for liquid cooling piping within the battery pack, which is detrimental to improving the battery pack's energy density. Therefore, it is essential to improve the battery pack's heat exchange efficiency while reducing its size and increasing its structural strength.

[0003] Therefore, this application provides a liquid-cooled housing structure for a battery pack to meet the requirements. Utility Model Content

[0004] The purpose of this application is to provide a liquid-cooled housing structure for a battery pack, which aims to solve the problem that uneven temperature distribution between the top and bottom of the battery cell due to heat transfer at the bottom of the cell leads to slow heat exchange efficiency, and that existing methods require adding liquid cooling pipes inside the battery pack.

[0005] To achieve the above objectives, this application provides the following technical solution: a battery pack liquid-cooled housing structure, including a housing, an aerogel pad, a liquid cooling plate, and a square-shell battery cell; The inside of the enclosure is equipped with multiple sets of square-shell battery cells. Two square-shell battery cells are grouped together, and an aerogel pad is provided between each pair of square-shell battery cells. A liquid cooling plate is provided between each group of square-shell battery cells. The inner wall of the enclosure is connected to the liquid cooling plate, and the interior of the enclosure is equipped with a fluid channel that communicates with the liquid cooling plate.

[0006] Preferably, the box body includes a bottom plate, side plates, a front plate, a rear plate, and a box cover. The side plates are provided in two sets, symmetrically arranged on the left and right, and the two sets of side plates are connected by the front plate and the rear plate. The top surface and bottom surface of the side plates are respectively provided with the box cover and the bottom plate.

[0007] Preferably, the end of the side plate is provided with a side fluid channel communicating with the outside, and the opposite surfaces of the two sets of side plates are provided with side holes communicating with the side fluid channel, and multiple sets of side holes are provided. The rear plate is provided with a left and right interconnected rear fluid channel, and the rear fluid channel is connected to the last set of side holes; The liquid cooling plate is equipped with liquid cooling fluid channels, which are interconnected with the side holes.

[0008] Preferably, the side fluid channel, the rear fluid channel, and the liquid cooling fluid channel are each provided in groups of three.

[0009] Preferably, the port of the side fluid channel of the side plate is equipped with a docking part, which is funnel-shaped.

[0010] In summary, the technical effects and advantages of this utility model are as follows: This invention employs a transverse arrangement of prismatic battery cells, with two rows forming a group. This ensures that each prismatic cell has a maximum side surface in contact with the liquid cooling plate, reducing temperature differences between the cells and improving heat dissipation efficiency. Aerogel pads are installed on the inner sides of the two rows of cells to insulate against heat between them and provide flame retardancy in case of cell fire. By integrating the side panels of the battery pack into the flow channel circuit, the internal liquid cooling piping is eliminated, effectively reducing the battery pack's size and increasing its energy density. Even without the need for cooling or heating, the fluid channels within the side panels also provide thermal insulation. The transverse arrangement of the liquid cooling plate significantly enhances the torsional stiffness of the battery pack. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is a schematic diagram of the side plate and connecting parts of this utility model; Figure 4 This is a schematic diagram of the liquid cooling plate structure of this utility model; Figure 5 This is a schematic diagram of the rear plate structure of this utility model.

[0013] In the diagram: 1. Base plate; 2. Side plate; 200. Side fluid channel; 201. Side hole; 3. Front plate; 4. Rear plate; 400. Rear fluid channel; 5. Cover; 6. Liquid cooling plate; 600. Liquid cooling fluid channel; 7. Square-shell battery cell; 8. Connecting parts; 9. Aerogel pad. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example: Reference Figure 1-5 The battery pack liquid-cooled housing structure shown includes a housing, an aerogel pad 9, a liquid cooling plate 6, a square-shell battery cell 7, and a docking component 8.

[0016] In one embodiment of this invention, the enclosure, serving as an overall load-bearing frame, comprises a base plate 1, two sets of side plates 2 (symmetrically arranged on the left and right sides), a front plate 3, a rear plate 4, and a cover 5. The front ends of the two sets of side plates 2 are fixedly connected via the front plate 3, and their rear ends are fixedly connected via the rear plate 4, forming a rectangular frame structure. The top surfaces of the side plates 2 are sealed to the cover 5 with bolts, and their bottom surfaces are welded to the base plate 1, together forming a closed space for accommodating the square-shell battery cells 7 and the liquid-cooled plate 6.

[0017] As one implementation method in this embodiment, the arrangement of the square-shell battery cell 7 and the aerogel pad 9 is as follows: multiple sets of square-shell battery cells 7 are arranged laterally along the front-to-back direction inside the housing, each set containing two square-shell battery cells 7 arranged side by side; between every two parallel square-shell battery cells 7, a set of aerogel pads 9 are attached, the thickness of the aerogel pad 9 is adapted to the width of the square-shell battery cell 7, and it is fixed to the sides of the two square-shell battery cells 7 respectively by high-temperature resistant adhesive, which not only achieves physical isolation between the two battery cells, but also blocks the heat transfer between the battery cells through the heat insulation properties of aerogel.

[0018] As one implementation method in this embodiment, the liquid cooling plate 6 is installed as follows: a set of liquid cooling plates 6 is horizontally arranged between two adjacent sets of square-shell cells 7; the left and right ends of the liquid cooling plate 6 are welded and fixed to the opposite sides of the two side plates 2 respectively (that is, the inner wall of the box is directly connected to the liquid cooling plate 6), and the top and bottom surfaces of the liquid cooling plate 6 are respectively attached to the sides of the upper and lower sets of square-shell cells 7 by adhesive - this design ensures that each square-shell cell 7 has a maximum side surface that is in direct contact with the liquid cooling plate 6, maximizing the heat exchange area.

[0019] As one implementation method in this embodiment, in order to achieve a heat exchange circuit design without internal piping, this embodiment integrates the side plate 2, the rear plate 4 of the box and the liquid cooling plate 6 to form a fluid channel. Fluid structure of side plate 2: Each set of side plates 2 has a side fluid channel 200 (preferably 3 in a group, arranged in parallel up and down) inside along the front and back direction. One end of the side fluid channel 200 extends to the end of the side plate 2 and forms an opening. A connecting piece 8 (funnel-shaped structure, which is convenient for connecting with the pipeline of the external thermal management system and reduces fluid resistance) is welded and fixed at the opening. On the opposite side of the two sets of side plates 2 (i.e. the side facing the inside of the box), multiple sets of side holes 201 are opened at the position corresponding to each set of side fluid channels 200 (the number of side holes 201 is adapted to the number of sets of liquid cooling plates 6 and is evenly distributed along the front and back direction). The side holes 201 penetrate the inner wall of the side plate 2 to realize the communication between the side fluid channel 200 and the space inside the box. Fluid structure of rear plate 4: Rear fluid channels 400 are opened in the left and right direction inside the rear plate 4 (preferably in groups of 3, aligned vertically with the side fluid channels 200). The left and right ends of the rear fluid channels 400 are aligned with and welded to the "last group of side holes 201" of the two groups of side plates 2, forming a closed loop connection between the side fluid channels 200 and the rear fluid channels 400. Fluid structure of liquid cooling plate 6: Liquid cooling fluid channels 600 (three in a group, corresponding to the side fluid channels 200 and the rear fluid channels 400) are opened inside the liquid cooling plate 6 along the front-to-back direction. The left and right ends of the liquid cooling plate 6 are aligned with the side holes 201 of the two side plates 2 and welded together, so that the liquid cooling fluid channels 600 and the side fluid channels 200 are directly interconnected. Through the above design, the side fluid channel 200, side hole 201, rear fluid channel 400 and liquid-cooled fluid channel 600 together constitute a complete "circulating heat exchange loop", and the loop is integrated inside the box structure, so there is no need to set up additional liquid-cooled pipelines inside the box.

[0020] The working principle of this utility model is as follows: After the battery pack is assembled, the port of one set of docking parts 8 is connected to the thermal management system. Liquid flows into the side fluid channel 200 of one set of side plates 2, and enters the rear fluid channel 400 and liquid cooling fluid channel 600 of the rear plate 4 and liquid cooling plate 6 through the side hole 201 respectively. It then enters the side fluid channel 200 from the side hole 201 of another set of side plates 2 and exits from another set of docking parts 8, forming a cooling and heating circulation heat exchange circuit. The square-shell battery cell 7 is bonded and fixed to the battery pack bottom plate and liquid cooling plate 6 through the aerogel pad 9, which can ensure the structural stability of the battery pack.

[0021] When maintenance or replacement is required, the cover 5 can be opened to maintain the battery pack on the base plate 1.

[0022] The electromechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments; they are common knowledge.

[0023] Components not described in detail in this article are existing technologies.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack liquid-cooled tank structure, characterized by: Includes housing and aerogel pad (9), liquid cooling plate (6), and square-shell battery cell (7); The box is equipped with multiple sets of square-shell battery cells (7). The square-shell battery cells (7) are arranged in groups of two. An aerogel pad (9) is provided between each pair of square-shell battery cells (7). A liquid cooling plate (6) is provided between each group of square-shell battery cells (7). The inner wall of the box is connected to the liquid cooling plate (6), and the inside of the box is provided with a fluid channel, which is interconnected with the liquid cooling plate (6).

2. The battery pack liquid-cooled box structure of claim 1, wherein: The box includes a bottom plate (1), side plates (2), front plate (3), rear plate (4), and box cover (5). The side plates (2) are provided in two sets, which are symmetrically arranged on the left and right. The two sets of side plates (2) are connected by the front plate (3) and the rear plate (4). The top surface and bottom surface of the side plates (2) are respectively provided with box cover (5) and bottom plate (1).

3. The battery pack liquid-cooled box structure of claim 2, wherein: The end of the side plate (2) is provided with a side fluid channel (200) that connects to the outside. On the opposite side of the two sets of side plates (2), there are side holes (201) that connect to the side fluid channel (200). There are multiple sets of side holes (201). The rear plate (4) is provided with a left-right interconnected rear fluid channel (400), and the rear fluid channel (400) is connected to the last set of side holes (201); The liquid cooling plate (6) is provided with a liquid cooling fluid channel (600), and the liquid cooling fluid channel (600) is interconnected with the side hole (201).

4. The battery pack liquid-cooled housing structure according to claim 3, characterized in that: The side fluid channel (200), rear fluid channel (400), and liquid cooling fluid channel (600) are each provided in groups of three.

5. The battery pack liquid-cooled housing structure according to claim 3, characterized in that: The side fluid channel (200) of the side plate (2) is equipped with a docking part (8), which is funnel-shaped.

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