Battery pack and powered device

Abstract

The application relates to the technical field of battery packs and specifically provides a battery pack and a power utilization device. The battery pack comprises a box body and a battery pack; the box body comprises a frame and a bottom plate, the bottom plate is arranged at the bottom of the frame, the frame is provided with an exhaust port, the bottom plate is provided with a plurality of grooves at intervals and forms an exhaust passage, the exhaust passage is in communication with the exhaust port; the battery pack is arranged in the box body, and the bottom plate supports the battery pack; the battery pack comprises a plurality of battery cells, the battery cells are provided with explosion-proof valves, the explosion-proof valves are arranged towards the bottom plate, and the explosion-proof valves at least partially project and coincide with the exhaust passage. In the application, the plurality of grooves are arranged at intervals on the bottom plate to form the exhaust passage, the explosion-proof valves on the battery cells are arranged towards the exhaust passage, high-temperature gas and eruption matter sprayed from the explosion-proof valves can be timely discharged from the exhaust passage and smoothly discharged from the battery pack through the exhaust port in the case of thermal runaway, exhaust blockage is prevented, thermal runaway is prevented from further spreading, and the safety of the battery pack is ensured.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and specifically proposes a battery pack and an electrical device. Background Technology

[0002] In some new energy vehicles, the battery cells in the battery pack are designed with the explosion-proof valve facing downwards. When the battery pack experiences thermal runaway, a large amount of high-temperature gas and ejected material will be generated inside the cells, which will then be ejected towards the bottom of the vehicle, reducing injury to passengers and improving safety.

[0003] However, battery packs are generally equipped with a base plate at the bottom, and the explosion-proof valves of each cell are set downwards. When venting, the bottom plate can easily block the venting, making it difficult to vent and potentially causing safety risks. Utility Model Content

[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] In a first aspect, this application proposes a battery pack, which includes a housing and a battery pack; the housing includes a frame and a bottom plate, the bottom plate is located at the bottom of the frame, the frame has an exhaust port, the bottom plate has at least one groove forming an exhaust channel, the exhaust channel is connected to the exhaust port; the battery pack is located inside the housing, and the bottom plate supports the battery pack; the battery pack includes multiple battery cells, each battery cell is equipped with an explosion-proof valve, the explosion-proof valve is positioned facing the bottom plate, and the explosion-proof valve at least partially overlaps with the projection of the exhaust channel.

[0006] Secondly, this application proposes an electrical device that includes the battery pack of the first aspect.

[0007] The technical solution proposed in this application has at least the following technical effects:

[0008] In the above scheme, at least one groove is provided on the base plate to form an exhaust channel. The explosion-proof valve on the battery cell faces the exhaust channel, which can ensure that in the event of thermal runaway, the high-temperature gas is ejected downwards, reducing damage to passengers. Moreover, the high-temperature gas and ejected material ejected from the explosion-proof valve can be discharged from the exhaust channel in a timely manner. The exhaust channel is connected to the exhaust port of the battery pack, so that the high-temperature gas can be smoothly discharged from the battery pack, preventing exhaust blockage, avoiding further spread of thermal runaway, and ensuring the safety of the battery pack. Attached Figure Description

[0009] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.

[0010] Specifically, the annotations for the accompanying drawings are as follows:

[0011] Figure 1 This is a schematic diagram of the structure of the first type of battery pack described in some embodiments of this application;

[0012] Figure 2 This is a partial cross-sectional view of a first type of battery pack described in some embodiments of this application;

[0013] Figure 3 This is a schematic diagram of the structure of the housing of the first type of battery pack described in some embodiments of this application;

[0014] Figure 4 This is a schematic diagram of the structure of the second type of battery pack described in some embodiments of this application;

[0015] Figure 5 This is a partial cross-sectional view of a second type of battery pack described in some embodiments of this application;

[0016] Figure 6 This is a schematic diagram of the casing of the second type of battery pack described in some embodiments of this application.

[0017] Specifically, the annotations for the figure marks in the instruction manual are as follows:

[0018] 10. Frame; 20. Base plate; 201. Exhaust channel; 202. High temperature resistant layer; 30. Battery cell; 301. Explosion-proof valve; 302. First surface; 40. Protective plate; 50. Buffer component; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0019] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It should be understood that the content mentioned below represents only some embodiments of this application, and not all embodiments are listed exhaustively. Therefore, other embodiments that can be obtained based on the following embodiments without any inventive effort fall within the protection scope of this application.

[0020] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0021] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0022] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0023] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0024] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0025] Firstly, referring to Figures 1 to 6 The embodiments of this application propose a battery pack, which includes a housing and a battery pack. The housing includes a frame 10 and a bottom plate 20. The bottom plate 20 is located at the bottom of the frame 10. The frame 10 has an exhaust port. The bottom plate 20 has at least one groove forming an exhaust channel 201, which is connected to the exhaust port. The battery pack is located inside the housing, and the bottom plate 20 supports the battery pack. The battery pack includes multiple battery cells 30. Each battery cell 30 has an explosion-proof valve 301. The explosion-proof valve 301 is positioned facing the bottom plate 20, and at least part of the explosion-proof valve 301 is projected to coincide with the exhaust channel 201.

[0026] In this embodiment, there are multiple grooves to form an exhaust channel 201. The explosion-proof valve 301 on the battery cell 30 faces the exhaust channel 201, which ensures that in the event of thermal runaway, the high-temperature gas is ejected downwards, reducing damage to passengers. Moreover, the high-temperature gas and ejected material ejected from the explosion-proof valve 301 can be discharged from the exhaust channel 201 in a timely manner. The exhaust channel 201 is connected to the exhaust port of the battery pack, so that the high-temperature gas can be smoothly discharged from the battery pack, preventing exhaust blockage, avoiding further spread of thermal runaway, and ensuring the safety of the battery pack.

[0027] It should be noted that the exhaust port can be located at any position on the frame 10, as long as it is connected to the exhaust channel 201. Specifically, the connection between the two can be achieved using the cavity within the frame 10; in particular, Figures 1 to 6 The exhaust port is not shown.

[0028] For ease of explanation, the length direction of the battery pack is taken as the first direction X, the width direction of the battery pack is taken as the second direction Y, and the height direction of the battery pack is taken as the third direction Z. It can be understood that the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The base plate 20 is set opposite to the battery pack along the third direction Z, that is, the explosion-proof valve 301 and the exhaust channel 201 at least partially overlap along the third direction Z.

[0029] In some embodiments, combined with Figure 2 and Figure 3 The width of the exhaust channel 201 is d1mm, and the width of the base plate 20 is d2mm, satisfying 0.05≤d1 / d2≤0.25.

[0030] In this embodiment, the value of d1 / d2 should be appropriate, so as to avoid affecting the structural strength of the base plate 20, ensure that there is a certain support area for the battery pack, and ensure smooth exhaust and improve exhaust efficiency. For example, d1 / d2 can be any one of 0.05, 0.1, 0.15, 0.2 and 0.25 or within the range of any two of these values.

[0031] In some embodiments, refer to Figure 2 The width of the exhaust passage 201 is d1mm, which satisfies 50mm≤d1mm≤200mm.

[0032] In this embodiment, the width d1mm of the exhaust channel 201 cannot be too large, otherwise the support area of ​​the base plate 20 for the battery pack will be reduced, making the battery pack unstable and prone to shaking; it will also make the groove area larger, reducing the structural strength of the base plate 20. Furthermore, the width d1mm of the exhaust channel 201 should not be too small, otherwise the exhaust efficiency will be reduced, and blockage may occur due to large ejected material, affecting the exhaust effect. Therefore, the width d1mm of the exhaust channel 201 should be moderate; for example, d1mm can be any value of 50mm, 100mm, 150mm, and 200mm, or fall within the range of any two of these values.

[0033] In some embodiments, combined with Figure 2 and Figure 3 The width of the base plate 20 is d2mm, and it satisfies 800mm≤d2mm≤1500mm.

[0034] In this embodiment, the width d2mm of the base plate 20 should be moderate, ensuring sufficient support area for the battery pack and adequate space for the exhaust channel 201 to facilitate smooth exhaust and improve exhaust efficiency; while also avoiding an excessively large width d2mm that would affect the overall size of the battery pack. For example, the width d2mm of the base plate 20 can be any one of 800mm, 900mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, and 1500mm, or fall within a range of any two of these values.

[0035] In some embodiments, refer to Figure 2 There are multiple exhaust channels 201, and the distance between two adjacent exhaust channels 201 is d3mm, which satisfies 50mm≤d3mm≤180mm.

[0036] In this embodiment, the distance d3mm between two adjacent exhaust channels 201 should not be too large, otherwise the exhaust area of ​​the exhaust channel 201 will be reduced, affecting the exhaust effect. In addition, d3mm should not be too small, otherwise the support area for the battery pack will be reduced, resulting in unstable support and low strength of the base plate 20. Therefore, d3mm should be moderate. For example, d3mm can be any one of 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm and 180mm or within the range of any two of these values.

[0037] In some embodiments, refer to Figure 2 The height of the exhaust channel 201 is h1mm, and it satisfies 10mm≤h1mm≤30mm.

[0038] In this embodiment, the height h1mm of the exhaust channel 201 should not be too large, otherwise the groove will be too deep and affect the structural strength of the base plate 20. At the same time, the height h1mm of the exhaust channel 201 should not be too small, otherwise the exhaust effect will be affected. Therefore, h1mm should be moderate. For example, h1 can be any one of 10mm, 20mm and 30mm or within the range of any two of them.

[0039] In some embodiments, refer to Figure 2 and Figure 5 The inner side of the exhaust channel 201 is provided with a high-temperature resistant layer 202.

[0040] In this embodiment, a high-temperature resistant layer 202 is provided on the inner side of the exhaust channel 201 to prevent high-temperature gas from damaging the base plate 20 when it is ejected from the explosion-proof valve 301, thereby extending the service life of the base plate 20.

[0041] Optionally, the high-temperature resistant layer 202 is ceramic, and the high-temperature resistant layer 202 is attached to the inner side of the exhaust channel 201.

[0042] In some embodiments, refer to Figure 2 and Figure 5 The high-temperature resistant layer 202 shall at least cover the bottom surface of the exhaust channel 201.

[0043] In this embodiment, the bottom surface of the exhaust channel 201 is positioned opposite to the explosion-proof valve 301, allowing high-temperature gas and ejected materials to be directly ejected towards the bottom surface. The high-temperature resistant layer 202 is located on the bottom surface, providing effective protection. Alternatively, providing a high-temperature resistant layer 202 on the inner wall of the exhaust channel 201 is also a preferable implementation method.

[0044] In some embodiments, refer to Figure 2 and Figure 5 The battery pack also includes a protective plate 40, which is located on the side of the base plate 20 facing away from the battery pack.

[0045] In this embodiment, a protective plate 40 is provided below the base plate 20 to provide further protection, preventing high-temperature gas from being directly ejected after damaging the base plate 20, and also preventing external objects from puncturing the battery pack.

[0046] In some embodiments, refer to Figure 2 There is a gap between the protective plate 40 and the base plate 20. The minimum size of the gap is h2mm, and it satisfies 3mm≤h2mm≤9mm.

[0047] In this embodiment, a gap is provided between the protective plate 40 and the base plate 20, which can act as a buffer when the battery pack collides, and can also buffer the gas when high-temperature gas breaks through the base plate 20. Of course, the gap h2mm between the two cannot be too large, otherwise it will occupy too much space and reduce the space utilization of the battery pack; at the same time, the gap h2mm cannot be too small, otherwise it will affect the collision buffering effect and make it difficult to effectively buffer the gas. Therefore, h2 should be moderate. For example, h2mm can be any value of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm and 9mm or within the range of any two of these values.

[0048] In some embodiments, refer to Figure 2 and Figure 5 The battery pack also includes a buffer 50, which fills the gap.

[0049] In this embodiment, the buffer 50 can further cushion the impact on the battery pack and ensure battery safety; optionally, the buffer 50 is foam.

[0050] In some embodiments, multiple exhaust ports are provided, and each of the multiple exhaust ports is respectively configured to correspond to one end of a multiple exhaust channel 201.

[0051] In this embodiment, one implementation of the exhaust port is proposed. Specifically, multiple exhaust ports are provided and each is respectively provided with a corresponding multiple exhaust channel 201 to avoid mutual interference between the exhaust processes of each exhaust channel 201 and improve exhaust efficiency.

[0052] In some embodiments, a confluence channel is provided within the frame 10. One end of the confluence channel is an exhaust port, and the other end is provided with multiple air inlets. The multiple air inlets are respectively connected to multiple exhaust channels 201.

[0053] In this embodiment, another implementation of the exhaust port is proposed. Specifically, one exhaust port is provided and connected to multiple exhaust ports through the confluence channel within the frame 10. This can also achieve the purpose of exhaust and is also a desirable implementation method.

[0054] In some embodiments, the housing has a first direction X and a second direction Y that are perpendicular to each other, and the size of the housing along the first direction X is greater than its size along the second direction Y; the exhaust channel 201 extends along the first direction X, or the exhaust channel 201 extends along the second direction Y.

[0055] In this embodiment, refer to Figure 3 The exhaust passage 201 extends along the first direction X, as shown in the reference. Figure 6 The exhaust passage 201 extends along the second direction Y. All of the above are preferred implementation methods.

[0056] In some embodiments, the battery cell 30 has an adjacent first surface 302 and a second surface, the area of ​​the first surface 302 is larger than the area of ​​the second surface, and the first surface 302 faces a first direction X or a second direction Y.

[0057] In this embodiment, refer to Figure 1 and Figure 4 The first surface 302 of the battery cell 30 faces the first direction X. In some embodiments not shown in the figures, the first surface 302 of the battery cell 30 faces the second direction Y, which is also a preferred implementation.

[0058] Secondly, this application proposes an electrical device that includes the battery pack of the first aspect. Therefore, the electrical device of the second aspect possesses all the technical effects of the battery pack of the first aspect, and its specific technical effects will not be elaborated further.

[0059] Optionally, the electric device can be a hybrid vehicle, a new energy vehicle, or a flying car.

[0060] It should be noted that the battery pack in this embodiment may also include other components, such as a battery management system, a battery protection board, etc. Other components will not be described in detail here.

[0061] In particular, the term "and / or" in this application should be understood as follows:

[0062] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0063] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;

[0064] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.

[0065] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, include: The box body includes a frame (10) and a bottom plate (20). The bottom plate (20) is located at the bottom of the frame (10). The frame (10) is provided with an exhaust port. The bottom plate (20) is provided with at least one groove and forms an exhaust channel (201). The exhaust channel (201) is connected to the exhaust port. A battery pack is located inside the housing, and the base plate (20) supports the battery pack. The battery pack includes multiple cells (30), and each cell (30) is equipped with an explosion-proof valve (301). The explosion-proof valve (301) is positioned facing the base plate (20), and the explosion-proof valve (301) at least partially overlaps with the projection of the exhaust channel (201).

2. The battery pack according to claim 1, characterized in that, The width of the exhaust channel (201) is d1mm, and the width of the base plate (20) is d2mm, satisfying 0.05≤d1 / d2≤0.

25.

3. The battery pack according to claim 2, characterized in that, The width d1mm of the exhaust channel (201) satisfies 50mm≤d1mm≤200mm.

4. The battery pack according to claim 2, characterized in that, The width d2mm of the base plate (20) satisfies 800mm≤d2mm≤1500mm.

5. The battery pack according to claim 1, characterized in that, The number of exhaust channels (201) is multiple, and the distance between two adjacent exhaust channels (201) is d3mm, which satisfies 50mm≤d3mm≤180mm.

6. The battery pack according to claim 1, characterized in that, The height of the exhaust channel (201) is h1mm, and satisfies 10mm≤h1mm≤30mm.

7. The battery pack according to claim 1, characterized in that, The inner side of the exhaust channel (201) is provided with a high temperature resistant layer (202).

8. The battery pack according to claim 7, characterized in that, The high-temperature resistant layer (202) at least covers the bottom surface of the exhaust channel (201).

9. The battery pack according to claim 1, characterized in that, The battery pack also includes a protective plate (40), which is located on the side of the base plate (20) facing away from the battery pack.

10. The battery pack according to claim 9, characterized in that, There is a gap between the protective plate (40) and the base plate (20), the minimum size of the gap is h2mm, and it satisfies 3mm≤h2mm≤9mm.

11. The battery pack according to claim 10, characterized in that, The battery pack also includes a buffer (50) that fills the gap.

12. The battery pack according to claim 1, characterized in that, The exhaust port is provided in multiple ways, and each of the multiple exhaust ports is respectively provided at one end of the multiple exhaust channels (201).

13. The battery pack according to claim 1, characterized in that, The frame (10) is provided with a confluence channel. One end of the confluence channel is the exhaust port, and the other end is provided with multiple air inlets. The multiple air inlets are respectively connected to the multiple exhaust channels (201).

14. The battery pack according to claim 1, characterized in that, The box has a first direction (X) and a second direction (Y) that are perpendicular to each other, and the dimension of the box along the first direction (X) is larger than its dimension along the second direction (Y); The exhaust passage (201) extends along the first direction (X), or the exhaust passage (201) extends along the second direction (Y).

15. The battery pack according to claim 14, characterized in that, The battery cell (30) has an adjacent first surface (302) and a second surface, the area of ​​the first surface (302) is larger than the area of ​​the second surface, and the first surface (302) faces the first direction (X) or the first surface (302) faces the second direction (Y).

16. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 15.

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