Directional exhaust battery pack

Abstract

The utility model discloses a directional exhaust battery pack, and relates to the technical field of battery pack design, the battery pack comprises a box body, a plurality of battery units are placed in the box body, a liquid cooling plate is arranged at the bottom of the box body, a hollow hole is arranged at the position of a battery cell explosion-proof valve of each battery unit, which is opposite to the liquid cooling plate, and an exhaust channel is embedded in the hollow hole; a plurality of spacing plates are uniformly arranged in the exhaust channel, the spacing plate at the tail end of one end of the exhaust channel and the liquid cooling plate form sealing, and the other end of the exhaust channel is communicated with a battery pack anti-explosion valve; open holes are formed in the other spacing plates except the spacing plate at the tail end, turnover plates are arranged on the sides, away from the spacing plate at the tail end, of the open holes, the turnover plates are rotationally connected with the spacing plates through connecting adhesive tapes, and the size of the turnover plates is larger than that of the open holes. According to the utility model, the exhaust channel capable of exhausting directionally is arranged, so that high-temperature conductive gas exhausted by the thermal runaway battery cells is exhausted out of the battery pack directionally, other battery cells on an exhaust path are protected, and the violence of a thermal runaway event of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack design, and in particular to a battery pack with directional exhaust. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] At present, with the vigorous development of new energy vehicles, the market share of electric vehicles is increasing, and the number of electric vehicle spontaneous combustion accidents has also increased. Therefore, the requirements for the thermal runaway performance of batteries in vehicles are also increasing. The battery industry should promptly propose a thermoelectric separation solution to reduce the possibility of battery spontaneous combustion. The currently proposed thermoelectric separation solution is to open the battery cell explosion-proof valve downward, and the high-temperature conductive gas is discharged from a specific channel at the bottom of the battery pack to the battery pack explosion-proof valve, and then discharged from the battery pack. However, there are certain problems with the existing solution. That is, the battery cells inside the battery pack are closely arranged, and the high-temperature conductive gas spreads in the exhaust channel, which may cause thermal runaway of other battery cells or damage the explosion-proof valve, which may easily cause damage to other battery cells and still leave the possibility of battery spontaneous combustion. Utility Model Content

[0004] In response to the above-mentioned problems and defects in the prior art, the present invention provides a battery pack with directional exhaust. By setting an exhaust channel for directional exhaust in the battery pack, the high-temperature conductive gas discharged from the thermal runaway battery cell is directed out of the battery pack, and the remaining battery cells on the high-temperature conductive gas exhaust path are protected, thereby reducing the severity of the thermal runaway event of the battery pack, thereby solving the problem that the high-temperature conductive gas discharged from the thermal runaway battery cell can easily cause thermal runaway in other battery cells.

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

[0006] A battery pack with directional exhaust comprises a box, wherein a plurality of battery cells are sequentially arranged inside the box, a liquid cooling plate and a bottom guard plate are sequentially provided at the bottom of the box, and hollow openings are provided at positions of the battery cell explosion-proof valves facing the liquid cooling plate, wherein the hollow openings have exhaust channels embedded therein;

[0007] A plurality of partitions are evenly arranged inside the exhaust channel, the end partition plate at one end of the exhaust channel forms a seal with the liquid cooling plate, and the other end of the exhaust channel is connected to the battery pack explosion-proof valve; an opening is provided on each of the partition plates except the end partition plate, and a flip plate is provided on the side of the opening away from the end partition plate, and the flip plate is rotatably connected to the partition plate by a connecting tape, and the size of the flip plate is larger than the size of the opening.

[0008] According to a further technical solution, the cross section of the exhaust channel is U-shaped, and the U-shaped opening of the exhaust channel faces the battery cell explosion-proof valve of the battery unit and forms a complete cavity with the battery cell explosion-proof valve.

[0009] According to a further technical solution, flanges are provided at both ends of the U-shape, the exhaust channel is embedded in the hollow opening of the liquid cooling plate, and the flanges on both sides of the exhaust channel are adhered to the upper surface of the liquid cooling plate.

[0010] According to a further technical solution, the box body includes a plurality of side beams, cross beams and longitudinal beams, the plurality of side beams form a square frame, and the cross beams and longitudinal beams are fixedly arranged in the square frame.

[0011] According to a further technical solution, the liquid cooling plate is fixedly arranged at the bottom of the box body and forms a seal with the bottom of the box body.

[0012] According to a further technical solution, the bottom guard plate is fixedly arranged on the bottom of the liquid cooling plate and forms a seal with the bottom of the liquid cooling plate.

[0013] According to a further technical solution, a cooling channel is further provided on the liquid cooling plate.

[0014] According to a further technical solution, the liquid cooling plate is made of aluminum alloy.

[0015] According to a further technical solution, the exhaust passage is made of heat-insulating material.

[0016] According to a further technical solution, the plurality of partition plates arranged in the exhaust passage are movable.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model provides a battery pack with directional exhaust, in which an exhaust channel for directional exhaust is arranged in the battery pack. The exhaust channel discharges the high-temperature conductive gas generated when the battery cell thermal runaway in a directionally manner out of the battery pack through a partition plate that can be opened one-way in the exhaust channel. At the same time, after the partition plate is opened, the remaining battery cells on the high-temperature conductive gas exhaust path are protected, thereby reducing the severity of the thermal runaway event of the battery pack, thereby solving the problem that the high-temperature conductive gas discharged from the battery cell in thermal runaway can easily cause thermal runaway in other battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 This is a schematic diagram of an explosion of a battery pack with directional exhaust in the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the liquid cooling plate in the utility model;

[0022] Figure 3 It is a schematic structural diagram of the exhaust channel in the utility model;

[0023] Figure 4 This is a schematic diagram of the opening process of the flip plate in the exhaust channel of the utility model;

[0024] Figure 5 It is a schematic diagram of the exhaust path in the utility model;

[0025] Figure 6 This is a partial enlarged schematic diagram of the exhaust path in the present utility model;

[0026] Figure 7 It is a schematic diagram of the transverse matching cross section of the exhaust channel in the present invention.

[0027] Among them, 1. Box body; 2. Liquid cooling plate; 3. Exhaust channel; 4. Bottom guard plate; 5. Battery unit; 6. Partition plate; 7. Flip plate; 8. Connecting tape; 9. Battery pack explosion-proof valve; 10. Exhaust guide plate. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] like Figure 1 As shown, the present invention proposes a battery pack with directional exhaust, including a box body 1, in which multiple battery cells 5 are arranged in sequence. The bottom of the box body 1 is provided with a liquid cooling plate 2 and a bottom guard plate 4 in sequence. The battery cell is the smallest unit of power storage. The multiple battery cells are connected in series and parallel and fixedly arranged in the cavity formed by the box body and the liquid cooling plate. The bottom guard plate serves as the bottom layer of the battery pack to protect the battery pack and ensure its safety. Figure 1 and Figure 2As shown, a hollow opening is provided at the position of the battery cell explosion-proof valve facing the liquid cooling plate 2, and an exhaust channel 3 is embedded in the hollow opening. This hollow opening design facilitates the high-temperature gas ejected from the battery cell 5 during thermal runaway to pass through the hollow opening on the liquid cooling plate 2 and enter the exhaust channel 3 embedded in the liquid cooling plate 2.

[0031] Furthermore, the box body 1 includes a plurality of side beams, cross beams and longitudinal beams, and the plurality of side beams form a square frame, in which cross beams and longitudinal beams are fixedly arranged, and the strength of the box body is further increased by the arrangement of the cross beams and longitudinal beams. Figure 7 As shown, the liquid cooling plate 2 is fixedly mounted on the bottom of the box, effectively sealing it. The bottom guard plate 4 is also fixedly mounted on the bottom of the liquid cooling plate 2, effectively sealing it. This design prevents gas from escaping from the battery pack, improving safety.

[0032] like Figure 3 As shown, the exhaust channel 3 is made of a heat-insulating material, and a plurality of partition plates 6 are evenly arranged inside the exhaust channel. Preferably, the plurality of partition plates 6 arranged in the exhaust channel are movable, that is, the exhaust channel can be movably inserted into or removed from the exhaust channel; the end partition plate at one end of the exhaust channel 3 forms a seal with the liquid cooling plate, and the other end of the exhaust channel 3 is connected to the battery pack explosion-proof valve 9; preferably, an exhaust guide plate 10 is also provided at the battery pack explosion-proof valve 9 for guiding the exhaust gas so that it is discharged through the battery pack explosion-proof valve.

[0033] like Figure 4 As shown, each of the partition plates 6 except the end partition plate is provided with an opening, and a flip plate 7 is provided on the side of the opening away from the end partition plate. The flip plate 7 is rotatably connected to the partition plate 6 by a connecting tape 8, and the size of the flip plate is larger than the size of the opening. This design allows the flip plate 7 to only flip to one side of the partition plate 6. In addition, the flip plate 7 is bonded to the partition plate 6 by the connecting tape 8. Normally, the flip plate 7 and the partition plate 6 are tightly attached as a whole; preferably, an adhesive with a certain adhesive strength can be provided at the contact portion between the two. When a battery cell of the battery unit experiences thermal runaway, the high-temperature gas ejected therefrom exerts pressure on the flip plate 7, causing the flip plate 7 to flip upward and no longer tightly attached to the partition plate 6. In the utility model, the partition plate 6 inside the exhaust channel is opened in one direction (i.e., the flip plate 7 flips upward), which satisfies the following requirements: 1kPa≤opening pressure≤3kPa.

[0034] In addition, the cross-section of the above-mentioned exhaust channel is U-shaped, and flanges are provided at both ends of the U-shape. The exhaust channel is embedded in the hollow opening of the liquid cooling plate, and the flanges on both sides of the exhaust channel are adhered to the upper surface of the liquid cooling plate. At the same time, the U-shaped opening of the exhaust channel faces the battery cell explosion-proof valve of the battery unit, and forms a complete cavity with the battery cell explosion-proof valve.

[0035] Furthermore, the liquid cooling plate is made of aluminum alloy and is provided with cooling channels for cooling the battery cells.

[0036] The specific working process of this utility model is as follows:

[0037] like Figure 4 、 Figure 5 and Figure 6 As shown, when a battery cell experiences thermal runaway, the high-temperature gas it ejects applies pressure to the flip plate 7, causing it to flip upward. The high-temperature gas is then discharged along the exhaust duct 3 toward the battery pack explosion-proof valve 9, ultimately exiting the battery pack. During this process, in the direction opposite to the exhaust of the thermally runaway cell, the high-temperature conductive gas is prevented from spreading in the opposite direction due to the presence of the flip plate 7, thereby protecting the battery cell 5 in the opposite direction and reducing the possibility of thermal runaway in the battery cell 5 in the opposite direction of exhaust. Simultaneously, in the positive exhaust direction, the flip plate 7, when flipped upward, can isolate the high-temperature gas from the battery cell 5 in the exhaust direction, reducing the heat applied to the battery cell 5 in the exhaust direction and preventing thermal runaway.

[0038] Through the above-mentioned design and protection measures, it is possible to effectively prevent the thermal runaway battery cell 5 from causing thermal runaway in other battery cells 5, protect the remaining battery cells on the high-temperature conductive gas exhaust path, and reduce the severity of the battery pack thermal runaway event.

[0039] Although the above describes the specific implementation methods of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A battery pack with directional exhaust, characterized in that: The invention comprises a box body, wherein a plurality of battery cells are sequentially arranged inside the box body, a liquid cooling plate and a bottom guard plate are sequentially provided at the bottom of the box body, a hollow opening is provided at a position where the explosion-proof valve of the battery cell faces the liquid cooling plate, and an exhaust channel is embedded in the hollow opening; A plurality of partitions are evenly arranged inside the exhaust channel, the end partition plate at one end of the exhaust channel forms a seal with the liquid cooling plate, and the other end of the exhaust channel is connected to the battery pack explosion-proof valve; an opening is provided on each of the partition plates except the end partition plate, and a flip plate is provided on the side of the opening away from the end partition plate, and the flip plate is rotatably connected to the partition plate by a connecting tape, and the size of the flip plate is larger than the size of the opening.

2. The battery pack with directional exhaust according to claim 1, wherein: The cross section of the exhaust channel is U-shaped, and the U-shaped opening of the exhaust channel faces the battery cell explosion-proof valve of the battery unit and forms a complete cavity with the battery cell explosion-proof valve.

3. The battery pack with directional exhaust as claimed in claim 2, wherein: The ends of both sides of the U-shape are provided with flanges, the exhaust channel is embedded in the hollow opening of the liquid cooling plate, and the flanges on both sides of the exhaust channel are adhered to the upper surface of the liquid cooling plate.

4. The battery pack with directional exhaust according to claim 1, wherein: The box body comprises a plurality of side beams, a transverse beam and a longitudinal beam, wherein the plurality of side beams form a square frame, and the transverse beam and the longitudinal beam are fixedly arranged in the square frame.

5. The battery pack with directional exhaust according to claim 1, wherein: The liquid cooling plate is fixedly arranged at the bottom of the box body and forms a seal with the bottom of the box body.

6. The battery pack with directional exhaust as claimed in claim 5, characterized in that: The bottom guard plate is fixedly arranged on the bottom of the liquid cooling plate and forms a seal with the bottom of the liquid cooling plate.

7. The battery pack with directional exhaust according to claim 1, wherein: The liquid cooling plate is also provided with a cooling channel.

8. The battery pack with directional exhaust according to claim 1, wherein: The liquid cooling plate is made of aluminum alloy.

9. The battery pack with directional exhaust according to claim 1, wherein: The exhaust passage is made of heat-insulating material.

10. The battery pack with directional exhaust according to claim 1, wherein: The plurality of partition plates arranged in the exhaust channel are movable.

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