Bottom plate, box body and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a bottom plate, a box body and a battery pack. The bottom plate comprises a first plate, a second plate and a third plate which are welded in sequence, a heat exchange runner is arranged between the first plate and the second plate for heat exchange of the battery, an exhaust space is arranged between the third plate and the second plate, the first plate and the second plate are both provided with exhaust channels, and the exhaust channels are communicated with the exhaust space; a plurality of first bulges are arranged on one side, facing the second plate, of the third plate, and are welded with the second plate, so that the connection firmness of the bottom plate can be improved, the strength of the bottom plate can be improved, an exhaust space is formed between the second plate and the third plate, and high-temperature jets generated during thermal runaway of the battery are exhausted to the exhaust space through an exhaust channel; therefore, the influence of high-temperature jetted objects on adjacent single batteries can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a base plate, a housing, and a battery pack. Background Technology

[0002] In related technologies, the explosion-proof valve of a single battery cell is positioned facing the base plate. However, when a single battery in the battery pack experiences thermal runaway, high-temperature ejected material is ejected from the explosion-proof valve. This high-temperature ejected material acts directly on the battery base plate and cannot be discharged from the battery pack. The accumulation of high-temperature ejected material can also affect batteries that have not experienced thermal runaway.

[0003] Therefore, a base plate is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a base plate, housing, and battery pack that can promptly remove high-temperature ejected material while ensuring cooling of individual battery cells.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a base plate is provided, comprising a first plate, a second plate, and a third plate welded sequentially. A heat exchange channel is provided between the first plate and the second plate, and an exhaust space is provided between the third plate and the second plate. Both the first plate and the second plate are provided with exhaust channels, which communicate with the exhaust space. The third plate has a plurality of first protrusions on the side facing the second plate, and the first protrusions are welded to the second plate.

[0007] Secondly, a box body is provided, including a frame and a base plate as described in any of the above embodiments, wherein the frame is connected to the base plate.

[0008] Thirdly, a battery pack is provided, including a battery pack and a housing as described in the above-described solution, wherein the battery pack is located within the housing.

[0009] This utility model has at least the following beneficial effects:

[0010] The base plate, housing, and battery pack provided by this utility model are made by welding the first plate, the second plate, and the third plate together, which can improve the connection strength of the base plate. A heat exchange channel is formed between the first plate and the second plate to exchange heat with the battery. An exhaust space is formed between the second plate and the third plate. When the battery thermal runaway occurs, the high-temperature ejected material is discharged to the exhaust space through the exhaust channel, which can prevent the high-temperature ejected material from affecting adjacent battery cells. In addition, the third plate and the second plate are welded to the second plate through the first protrusion, which can increase the connection area between the third plate and the second plate, thereby improving the strength of the base plate. Attached Figure Description

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

[0012] Figure 1 A top view of the base plate provided in an embodiment of this utility model;

[0013] Figure 2 for Figure 1 Sectional view at point AA;

[0014] Figure 3 for Figure 2 A magnified view of a section at point B in the middle;

[0015] Figure 4 for Figure 2 A magnified view of a section at point C;

[0016] Figure 5 A first view showing the connection between the first plate and the second plate in an embodiment of this utility model;

[0017] Figure 6 A second view showing the connection between the first plate and the second plate in an embodiment of this utility model;

[0018] Figure 7 A cross-sectional view of the connection between the first plate and the second plate provided in an embodiment of this utility model;

[0019] Figure 8 for Figure 7 A magnified view of a section at point E in the middle;

[0020] Figure 9 A schematic diagram of the structure of the third plate provided in an embodiment of this utility model.

[0021] In the picture:

[0022] 1. First plate; 2. Second plate; 21. Groove; 3. Third plate; 31. First protrusion; 32. Second protrusion; 4. Heat exchange channel; 5. Exhaust space; 6. Exhaust passage; 61. First exhaust passage; 62. Second exhaust passage. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two).

[0028] like Figures 1-9 As shown, this embodiment provides a base plate that can promptly remove high-temperature sprayed material while ensuring the base plate's cooling function.

[0029] Specifically, such as Figures 1 to 4 As shown, the base plate includes a first plate 1, a second plate 2 and a third plate 3 welded in sequence. A heat exchange channel 4 is provided between the first plate 1 and the second plate 2. An exhaust space 5 is provided between the third plate 3 and the second plate 2. Both the first plate 1 and the second plate 2 are provided with exhaust channels 6, which are connected to the exhaust space 5. The third plate 3 has multiple first protrusions 31 on the side facing the second plate 2, and the first protrusions 31 are welded to the second plate 2.

[0030] The base plate provided in this embodiment has a first plate 1, a second plate 2, and a third plate 3 welded together, which improves the connection strength of the base plate. A heat exchange channel 4 is formed between the first plate 1 and the second plate 2 to exchange heat with the battery. An exhaust space 5 is formed between the second plate 2 and the third plate 3. When the battery thermally runs away, the high-temperature ejected material is discharged to the exhaust space 5 through the exhaust channel 6, which can prevent the high-temperature ejected material from affecting adjacent battery cells. In addition, the third plate 3 and the second plate 2 are welded to the second plate 2 through a first protrusion 31, which can increase the connection area between the third plate 3 and the second plate 2, thereby improving the strength of the base plate.

[0031] like Figures 5 to 8 As shown, the first plate 1 is a flat plate, and the second plate 2 has multiple grooves 21 away from the first plate 1. The grooves 21 and the first plate 1 form a heat exchange channel 4. The part of the second plate 2 without grooves 21 abuts against the first plate 1. The flatness of the first plate 1 ensures the flatness of the battery during installation, while the grooves 21 on the second plate 2 form a heat exchange channel. The part of the second plate 2 without grooves 21 is welded to the first plate 1, thereby improving the connection strength between the first plate 1 and the second plate 2.

[0032] For example, the second plate 2 is bent away from the first plate 1 to form multiple grooves 21, which can be obtained by stamping. The unbent part of the second plate 2 is then welded to the first plate 1.

[0033] The exhaust channel 6 is located on the surfaces where the first plate 1 and the second plate 2 abut against each other. The first plate 1 and the second plate 2 are welded together at least along the circumference of the exhaust channel 6. This arrangement allows the exhaust channel 6 to avoid the heat exchange channel 4, thus enabling the base plate to serve both cooling and exhaust functions. The sealed welding of the first plate 1 and the second plate 2 prevents gaps from forming between the first plate 1 and the second plate 2, which could allow thermally runaway objects to enter the gap between the first plate 1 and the second plate 2 through the exhaust channel and then into the heat exchange channel 4.

[0034] like Figure 1 , Figure 5 and Figure 6 As shown, the exhaust channel 6 includes a first exhaust channel 61 and a second exhaust channel 62. The first exhaust channel 61 is located at the corner of the first plate 1 and the corner of the second plate 2. The second exhaust channel 62 is positioned directly opposite the explosion-proof valve of the battery cell. The first exhaust channel 61 guides the high-temperature ejected material to the exhaust beam of the battery pack housing, preventing the high-temperature ejected material from accumulating in the exhaust space.

[0035] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9As shown, in some embodiments, the surfaces of the first plate 1 and the second plate 2 that are in contact surround the first protrusion 31, and the sidewalls of the first plate 1 and the second plate 2 that abut against each other are welded to the first protrusion 31. It can be understood that the first protrusion 31 is positioned directly opposite the sidewalls of the first plate 1 and the second plate 2 that abut against each other, thereby allowing the first protrusion 31 to be welded to the sidewalls of the second plate 2 and the first plate 1 that abut against each other, ensuring the fixed welding of the first plate 1, the second plate 2, and the third plate 3.

[0036] In some embodiments, the third plate 3 is further provided with a plurality of second protrusions 32, each of which is an elongated structure, and a guide channel is formed between two adjacent second protrusions 32. The provision of the guide channel ensures that in the event of thermal runaway of a battery cell, the channel formed by the plurality of second protrusions 32 and the second plate 2 can guide the high-temperature ejected material in one direction.

[0037] To connect adjacent guide channels and quickly expel high-temperature ejected material in the event of significant thermal runaway of a single battery cell, a second protrusion 32 is positioned on the side of the third plate 3 facing the second plate 2. A first gap is provided between the second protrusion 32 and the second plate 2, meaning that the second protrusion 32 and the second plate 2 do not contact each other. In the event of significant battery thermal runaway, if the amount of high-temperature ejected material from a single guide channel is large, it can flow through the gap between the second protrusion 32 and the second plate 2 into adjacent guide channels. This prevents the guide channel between adjacent second protrusions 32 from having a small exhaust volume and reduced guide efficiency, allowing the material to spread to other channels and thus improving guide efficiency.

[0038] To ensure the smooth discharge of high-temperature ejected material by connecting multiple guide channels and preventing blockages, in some embodiments, the second protrusion 32 and the side of the third plate 3 have a second gap, meaning the ends of the guide channels are interconnected through this second gap. This arrangement prevents blockages and ensures connectivity between the multiple channels. Furthermore, the second gap connects to the second exhaust channel 62, which in turn connects to the frame of the housing, guiding the high-temperature material into the frame and discharging it out of the housing through the frame.

[0039] In some embodiments, the second protrusion 32 is inclined relative to the first protrusion 31. Specifically, the extension direction of the second protrusion 32 forms an angle with the long sidewall of the third plate 3, and the angle between the extension direction of the second protrusion 32 and the third plate 3 is greater than or equal to 90°. The inclined arrangement of the second protrusion 32 can increase the overall strength. In addition, multiple second protrusions 32 are arranged in parallel, and the guide channel is arranged towards the second exhaust channel 62, which can reduce the path of the high-temperature ejector in the guide channel and improve the discharge efficiency of the high-temperature ejector.

[0040] In this embodiment, a box body is also provided, which includes a frame and a bottom plate, and the frame and the bottom plate are connected.

[0041] It should be noted that the enclosure has a guide channel, the inlet of which is connected to the second exhaust channel 62, and the outlet of which is connected to the outside atmosphere.

[0042] Since the housing includes the base plate provided in this embodiment, the first plate 1, the second plate 2 and the third plate 3 of the base plate are welded together, which can improve the connection strength of the base plate. A heat exchange channel 4 is formed between the first plate 1 and the second plate 2 to exchange heat with the battery. An exhaust space 5 is formed between the second plate 2 and the third plate 3. The high-temperature ejected material generated when the battery thermally runs away is discharged to the exhaust space 5 through the exhaust channel 6, which can prevent the high-temperature ejected material from affecting the adjacent battery cells. In addition, the third plate 3 and the second plate 2 are welded to the second plate 2 through the first protrusion 31, which can increase the connection area between the third plate 3 and the second plate 2, thereby improving the strength of the base plate.

[0043] Since it includes the aforementioned base plate, the battery pack of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.

[0044] In this embodiment, a battery pack is also provided, which includes a battery group and a housing provided in this embodiment. The battery group includes a plurality of arranged batteries, and the number of battery groups is not limited to one group, but can be multiple groups.

[0045] The battery pack includes the housing provided in this embodiment. The housing includes a base plate. The first plate 1, the second plate 2, and the third plate 3 of the base plate are welded together to improve the connection strength of the base plate. A heat exchange channel 4 is formed between the first plate 1 and the second plate 2 to exchange heat with the battery. An exhaust space 5 is formed between the second plate 2 and the third plate 3. When the battery thermally runs away, the high-temperature ejected material is discharged to the exhaust space 5 through the exhaust channel 6, which can prevent the high-temperature ejected material from affecting adjacent battery cells. In addition, the third plate 3 and the second plate 2 are welded to the second plate 2 through the first protrusion 31, which can increase the connection area between the third plate 3 and the second plate 2, thereby improving the strength of the base plate.

[0046] Since it includes the aforementioned housing, the battery pack of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.

[0047] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A backplane, characterized by, The assembly includes a first plate (1), a second plate (2), and a third plate (3) welded together in sequence. A heat exchange channel (4) is provided between the first plate (1) and the second plate (2). An exhaust space (5) is provided between the third plate (3) and the second plate (2). Both the first plate (1) and the second plate (2) are provided with exhaust channels (6). The exhaust channels (6) are connected to the exhaust space (5). The third plate (3) has a plurality of first protrusions (31) on the side facing the second plate (2). The first protrusions (31) are welded to the second plate (2).

2. The base plate of claim 1, wherein The first plate (1) is a flat plate, and the second plate (2) is provided with a plurality of grooves (21) away from the first plate (1). The grooves (21) and the first plate (1) form the heat exchange channel (4). The part of the second plate (2) without grooves (21) abuts against the first plate (1).

3. The base plate of claim 1, wherein The exhaust channel (6) is located on the surfaces where the first plate (1) and the second plate (2) abut against each other, and the first plate (1) and the second plate (2) are welded together at least along the circumference of the exhaust channel (6).

4. The base plate of claim 3, wherein The surfaces of the first plate (1) and the second plate (2) that are in contact are arranged outside the first protrusion (31), and the sidewalls of the first plate (1) and the second plate (2) that abut against each other are welded to the first protrusion (31).

5. The floor panel as claimed in any of claims 1-4, characterized in that The third plate (3) is also provided with a plurality of second protrusions (32), the second protrusions (32) are elongated, and a guide channel is formed between two adjacent second protrusions (32).

6. The base plate of claim 5, wherein The second protrusion (32) is disposed on the side of the third plate (3) facing the second plate (2), and the second protrusion (32) and the second plate (2) are provided with a first gap.

7. The base plate of claim 5, wherein The second protrusion (32) and the side of the third plate (3) are provided with a second gap.

8. The base plate of claim 5, wherein The second protrusion (32) is inclined relative to the first protrusion (31).

9. A case characterized by, It includes a frame and a base plate as described in any one of claims 1-8, wherein the frame is connected to the base plate.

10. A battery pack, characterized by, It includes a battery pack and a battery housing as described in claim 9, wherein the battery pack is located within the housing.

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