Battery pack lower shell and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and relates to a battery pack lower shell and a battery pack. Comprising a first boundary beam provided with a liquid inlet flow channel extending in the first direction; the second boundary beam is provided with a reversing flow channel and a liquid outlet flow channel extending in the first direction, the first liquid inlet end of the reversing flow channel is communicated with the first liquid outlet end of the liquid outlet flow channel, and the second liquid outlet end of the reversing flow channel and the second liquid inlet end of the liquid inlet flow channel are located on the same side of the battery pack lower shell; and the cooling plate is connected with the first edge beam and the second edge beam and provided with a plurality of cooling flow channels which are distributed in the first direction and connected in parallel, and the third liquid inlet ends and the third liquid outlet ends of the cooling flow channels communicate with the liquid inlet flow channel and the liquid outlet flow channel correspondingly to form a plurality of cooling flow paths with the same circulation path length. The circulation path lengths of the multiple cooling flow paths are equal, so that the flow in the cooling flow paths can be uniformly distributed; and the liquid inlet flow channel and the liquid outlet flow channel are respectively arranged in the first edge beam and the second edge beam, so that the energy density of the battery pack lower shell and the battery pack can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a battery pack lower shell and a battery pack. Background Art

[0002] Since the battery cells of the battery pack will emit heat during use, in order to ensure the safety of the battery pack, the temperature inside the battery pack needs to be adjusted to maintain it within a certain temperature range. At present, the cooling medium is generally transported by setting a large number of medium transport pipelines in the shell of the battery pack. Although it can play a role in regulating the temperature, it has a complex structure, occupies a large space, and has low space utilization, which is not conducive to improving the energy density of the battery pack. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present utility model is to provide a battery pack lower shell and a battery pack, which are used to solve the problems of complex structure and large space occupied by the cooling system in the battery pack shell in the prior art, so as to improve the space utilization and energy density of the battery pack lower shell and the battery pack.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a battery pack lower shell, including:

[0005] A first side beam, wherein a liquid inlet channel extending along a first direction is provided in the first side beam;

[0006] a second side beam, arranged opposite to the first side beam, a liquid outlet channel extending along the first direction is provided in the second side beam, a reversing channel is further provided in the second side beam, a first liquid inlet end of the reversing channel is connected with a first liquid outlet end of the liquid outlet channel, and a second liquid outlet end of the reversing channel and a second liquid inlet end of the liquid inlet channel are located on the same side of the lower shell of the battery pack; and

[0007] A cooling plate, wherein the cooling plate is located between the first side beam and the second side beam and is connected to the first side beam and the second side beam, wherein a plurality of cooling channels distributed along the first direction and connected in parallel are provided in the cooling plate, and a third liquid inlet end and a third liquid outlet end of the plurality of cooling channels are respectively connected to the liquid inlet channel and the liquid outlet channel to form a plurality of cooling channels with equal flow path lengths.

[0008] Optionally, a plurality of first liquid outlets spaced apart along the first direction are provided on the first side beam, and the third liquid inlet end of each cooling channel is connected to the liquid inlet channel via the first liquid outlet corresponding thereto.

[0009] Optionally, a plurality of first liquid inlets spaced apart along the first direction are provided on the second side beam, and the third liquid outlet end of each cooling channel is connected to the liquid outlet channel via the first liquid inlet corresponding thereto.

[0010] Optionally, the second side beam has a cavity extending along the first direction, the end of the cavity is sealed by a sealing portion, a partition plate extending along the first direction is provided in the cavity, the partition plate divides the cavity to form the liquid outlet channel and the reversing channel, a first gap is left between the end of the partition plate and the sealing portion, and the first gap connects the first liquid inlet end and the first liquid outlet end.

[0011] Optionally, the cooling plate is arranged flat in a horizontal direction to form at least a portion of a bottom plate of the lower shell of the battery pack.

[0012] Optionally, the cooling channels are distributed in a serpentine shape.

[0013] Optionally, the cooling channel is provided with a first partition plate and a second partition plate spaced apart and alternately distributed along the first direction, one end of the first partition plate is sealedly connected to the side wall of the first side beam, and a second gap is left between the other end of the first partition plate and the side wall of the second side beam, one end of the second partition plate is sealedly connected to the side wall of the second side beam, and a third gap is left between the other end of the second partition plate and the side wall of the first side beam.

[0014] Optionally, the second liquid inlet end is connected to a liquid inlet connector, and the second liquid outlet end is connected to a liquid outlet connector, and the liquid inlet connector and the liquid outlet connector are located on the same side of the lower shell of the battery pack.

[0015] Optionally, the lower shell of the battery pack further includes two end beams distributed along the first direction, and two ends of the end beams are respectively connected to the first side beam and the second side beam.

[0016] In order to achieve the above-mentioned purpose and other related purposes, the present application also provides a battery pack, including the battery pack lower shell as described above.

[0017] Optionally, the battery pack further includes battery cells, and the battery cells are placed on the cooling plate.

[0018] As described above, the battery pack lower shell and battery pack of the utility model have at least the following beneficial effects: the flow path lengths of the multiple cooling flow paths formed by connecting the liquid inlet channel, the liquid outlet channel and the multiple cooling flow paths are equal, which is beneficial to the uniform distribution of the flow in each cooling flow path; based on this, the liquid inlet channel is arranged in the first side beam, and the liquid outlet channel is arranged in the second side beam, and there is no need to arrange an additional medium delivery pipeline, which is beneficial to simplifying the structure, improving space utilization, and facilitating the small-volume production of the battery pack lower shell and the battery pack, thereby facilitating the improvement of the energy density of the battery pack lower shell and the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of an embodiment of a lower housing of a battery pack of the present utility model;

[0020] Figure 2 This is a front view of an embodiment of a lower housing of a battery pack of the present utility model;

[0021] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 for Figure 1 A schematic diagram of the local structure of the lower shell of the battery pack;

[0023] Figure 5 for Figure 4 A magnified schematic diagram of the part B in the middle;

[0024] Figure 6 This is a schematic diagram showing the flow path of the cooling medium in the lower shell of the battery pack of the present invention.

[0025] Part Number Description

[0026] First side beam 1, liquid inlet channel 11, second liquid inlet end 111, first liquid outlet 12, second liquid inlet 13, second side beam 2, liquid outlet channel 21, first liquid outlet end 211, first liquid inlet 22, reversing channel 23, first liquid inlet end 231, second liquid outlet end 232, second liquid outlet 24, third liquid outlet 25, partition plate 26, cooling plate 3, cooling channel 31, third liquid inlet end 311, third liquid outlet end 312, first partition plate 32, second partition plate 33, plate body 34, liquid inlet joint 4, liquid outlet joint 5, end beam 6. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0029] See also Figures 1 to 6 In some optional embodiments, the present application provides a battery pack lower shell, which includes a first side beam 1, a second side beam 2 and a cooling plate 3; in addition to the above-mentioned components, the battery pack lower shell may also include an end beam 6. A liquid inlet channel 11 extending along a first direction is provided in the first side beam 1; the second side beam 2 is arranged opposite to the first side beam 1, and a liquid outlet channel 21 extending along the first direction is provided in the second side beam 2, and a reversing channel 23 is also provided in the second side beam 2, a first liquid inlet end 231 of the reversing channel 23 is connected to a first liquid outlet end 211 of the liquid outlet channel 21, and a second liquid outlet end 232 of the reversing channel 23 and a second liquid inlet end 111 of the liquid inlet channel 11 are located on the same side of the lower shell of the battery pack; the cooling plate 3 is located between the first side beam 1 and the second side beam 2 and is connected to the first side beam 1 and the second side beam 2, and a plurality of cooling channels 31 distributed along the first direction and connected in parallel are provided in the cooling plate 3, and a third liquid inlet end 311 and a third liquid outlet end 312 of the plurality of cooling channels 31 are respectively connected to the liquid inlet channel 11 and the liquid outlet channel 21 to form a plurality of cooling channels with equal flow path lengths.

[0030] Optionally, the cooling plate 3 includes a plurality of plate bodies 34 distributed along the first direction, and one or more cooling channels 31 may be provided in each plate body 34. In the present application, the first direction, the length direction of the first side beam 1, the length direction of the second side beam 2 and the width direction of the plate body 34 are the same, i.e., the X direction in the drawings; the distribution direction of the first side beam 1 and the second side beam 2, the width direction of the first side beam 1, the width direction of the second side beam 2 and the length direction of the plate body 34 are the same, i.e., the Y direction in the drawings; the height direction of the first side beam 1, the height direction of the second side beam 2 and the thickness direction of the plate body 34 are the same, i.e., the Z direction in the drawings.

[0031] Optionally, a plurality of first liquid outlets 12 spaced apart along the first direction are provided on the first side beam 1 , and the third liquid inlet end 311 of each cooling channel 31 is connected to the liquid inlet channel 11 via the first liquid outlet 12 corresponding thereto.

[0032] Optionally, a plurality of first liquid inlets 22 spaced apart along the first direction are provided on the second side beam 2 , and the third liquid outlet 312 of each cooling channel 31 is connected to the liquid outlet channel 21 via the first liquid inlet 22 corresponding thereto.

[0033] Optionally, the second liquid inlet end 111 of the liquid inlet channel 11 is connected to a liquid inlet connector 4, and the second liquid outlet end 232 of the reversing channel 23 is connected to a liquid outlet connector 5. The liquid inlet connector 4 and the liquid outlet connector 5 are located on the same side of the lower shell of the battery pack, with a compact layout and convenient connection, especially convenient for connection with the pipeline outside the lower shell of the battery pack. Furthermore, the first side beam 1 is provided with a second liquid inlet 13 connected to the second liquid inlet end 111 of the liquid inlet channel 11, and the liquid inlet connector 4 is sealed and plugged with the second liquid inlet 13 and connected to the liquid inlet channel 11; the second side beam 2 is provided with a second liquid outlet 24, and the first liquid outlet end 211 of the liquid outlet channel 21 and the first liquid inlet end 231 of the reversing channel 23 are connected through the second liquid outlet 24; the second side beam 2 is provided with a third liquid outlet 25 connected to the second liquid outlet end of the reversing channel 23, and the liquid outlet connector 5 is sealed and plugged with the third liquid outlet 25 and connected to the reversing channel 23. The cooling medium enters the liquid inlet channel 11 through the liquid inlet joint 4, and then flows into the third liquid inlet end 311 of each cooling channel 31 from the first liquid outlet 12 at the second liquid inlet end 111, and then enters the interior of each cooling channel 31. After passing through the cooling channel 31, the cooling medium flows out from the third liquid outlet end 312 of the cooling channel 31 and enters the interior of the liquid outlet channel 21 from the corresponding first liquid inlet 22. After passing through the liquid outlet channel 21, the cooling medium enters the reversing channel 23 from the second liquid outlet 24 and is finally output through the liquid outlet joint 5.

[0034] Optionally, the number of end beams 6 can be two, the two end beams 6 are distributed along the first direction, the two ends of the end beam 6 are respectively connected to the first side beam 1 and the second side beam 2, the two end beams 6, the first side beam 1 and the second side beam 2 can be connected to form a square frame with a stable structure.

[0035] Optionally, the cooling plate 3 is laid flat in the horizontal direction to form at least a portion of the bottom plate of the lower shell of the battery pack. The cooling plate 3 can be connected and fixed to the first side beam 1, the second side beam 2 and the end beam 6, which is conducive to simplifying the structure.

[0036] In the battery pack lower shell of the above embodiment, the liquid inlet channel 11 is arranged in the first side beam 1, and the liquid outlet channel 21 and the reversing channel 23 are arranged in the second side beam 2, which can reduce the number of additional medium delivery pipelines, which is beneficial to simplifying the structure and reducing the occupied space; in addition, by providing the reversing channel 23, the cooling medium can be input and output from the same side of the battery pack lower shell, which is convenient for external piping and has a compact layout, which is beneficial to further improve the space utilization; and the cooperation of the liquid inlet channel 11, the cooling channel 31, the liquid outlet channel 21 and the reversing channel 23 not only enables the cooling medium to be input and output from the same side of the battery pack lower shell, but also makes the flow path lengths of each cooling flow path equal, which is beneficial to the uniform distribution of the cooling medium flow in each cooling flow path, and is beneficial to improving the cooling effect and space utilization of the battery pack lower shell.

[0037] See also Figure 1 and Figure 3 In some optional embodiments, the second side beam 2 has a cavity extending along the first direction, the end of the cavity is sealed by a sealing portion, a partition plate 26 extending along the first direction is provided in the cavity, the partition plate 26 divides the cavity to form a liquid outlet channel 21 and a reversing channel 23, and a first gap is left between the end of the partition plate 26 and the sealing portion, and the first gap is formed into a second liquid outlet 24 connecting the first liquid inlet end 231 and the first liquid outlet end 211.

[0038] Optionally, the sealing portion may be formed by a portion of the side wall of the end plate 6 or by a portion of the end wall of the second side beam 2 .

[0039] In the battery pack lower shell of the above embodiment, the cavity in the second side beam 2 is divided into a liquid outlet channel 21 and a reversing channel 23 by a partition plate 26, which has a simple structure and a compact layout.

[0040] See also Figure 1 and Figure 3 In some optional embodiments, the cooling channel 31 is distributed in a serpentine shape.

[0041] Optionally, a first partition 32 and a second partition 33 are provided in the cooling channel 31, which are spaced and alternately distributed along the first direction. In the same cooling channel 31, the number of the first partition 32 can be one or more, and the number of the second partition 33 can be one or more. Among them, one end of the first partition 32 is sealed and connected to the side wall of the first side beam 1, and a second gap is left between the other end of the first partition 32 and the side wall of the second side beam 2, one end of the second partition 33 is sealed and connected to the side wall of the second side beam 2, and a third gap is left between the other end of the second partition 33 and the side wall of the first side beam 1, and the cooling medium can pass through the second gap and the third gap.

[0042] The battery pack lower shell of the above embodiment is conducive to increasing the flow path of the cooling medium in the cooling channel 31 to facilitate sufficient cooling, which is conducive to improving the heat exchange performance of the battery pack lower shell.

[0043] See also Figures 1 to 6 In some optional embodiments, the present application also provides a battery pack, comprising a battery pack lower shell as in any of the above embodiments.

[0044] Optionally, the battery pack further includes a battery cell, which is installed in a lower shell of the battery pack and placed on a cooling plate 3 , or in other words, the bottom of the battery cell is in contact with the cooling plate 3 for heat exchange.

[0045] The battery pack of the above embodiment has all the advantages of the above battery pack lower shell, such as simple structure, compact layout, and high space utilization, which is conducive to the small-volume production of the battery pack, thereby facilitating the improvement of the energy density of the battery pack.

[0046] The battery pack lower shell and battery pack of the utility model reduce the number of parts by arranging the liquid inlet channel 11, the liquid outlet channel 21 and the reversing channel 23 in the first side beam 1 and the second side beam 2. The cooperation of the liquid inlet channel 11, the cooling channel 31, the liquid outlet channel 21 and the reversing channel 23 not only makes the flow path lengths of the formed cooling channels consistent to facilitate the uniform distribution of the cooling medium in the cooling channels, but also makes the liquid inlet connector 4 and the liquid outlet connector 5 can be located on the same side of the battery pack lower shell. The layout is compact, which is conducive to simplifying the structure, thereby improving the space utilization, and further conducive to improving the energy density of the battery pack lower shell and the battery pack.

[0047] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack lower shell, characterized in that: include: A first side beam, wherein a liquid inlet channel extending along a first direction is provided in the first side beam; a second side beam, arranged opposite to the first side beam, a liquid outlet channel extending along the first direction is provided in the second side beam, a reversing channel is further provided in the second side beam, a first liquid inlet end of the reversing channel is connected with a first liquid outlet end of the liquid outlet channel, and a second liquid outlet end of the reversing channel and a second liquid inlet end of the liquid inlet channel are located on the same side of the lower shell of the battery pack; as well as A cooling plate, wherein the cooling plate is located between the first side beam and the second side beam and is connected to the first side beam and the second side beam, wherein a plurality of cooling channels distributed along the first direction and connected in parallel are provided in the cooling plate, and a third liquid inlet end and a third liquid outlet end of the plurality of cooling channels are respectively connected to the liquid inlet channel and the liquid outlet channel to form a plurality of cooling channels with equal flow path lengths.

2. The battery pack lower shell according to claim 1, characterized in that: The first side beam is provided with a plurality of first liquid outlets spaced apart and distributed along the first direction, and the third liquid inlet end of each cooling channel is connected with the liquid inlet channel through the first liquid outlet corresponding thereto.

3. The battery pack lower shell according to claim 1, characterized in that: The second side beam is provided with a plurality of first liquid inlets spaced apart and distributed along the first direction, and the third liquid outlet end of each cooling channel is connected with the liquid outlet channel through the first liquid inlet corresponding thereto.

4. The battery pack lower shell according to claim 1, characterized in that: The second side beam has a cavity extending along the first direction, the end of the cavity is sealed by a sealing portion, a partition plate extending along the first direction is provided in the cavity, the partition plate divides the cavity to form the liquid outlet channel and the reversing channel, a first gap is left between the end of the partition plate and the sealing portion, and the first gap connects the first liquid inlet end and the first liquid outlet end.

5. The battery pack lower shell according to claim 1, characterized in that: The cooling plate is arranged flatly in a horizontal direction to form at least a part of a bottom plate of the lower case of the battery pack.

6. The battery pack lower shell according to claim 1, characterized in that: The cooling channels are distributed in a serpentine shape.

7. The battery pack lower shell according to claim 6, characterized in that: The cooling channel is provided with a first partition and a second partition spaced apart and alternately distributed along the first direction, one end of the first partition is sealedly connected to the side wall of the first side beam, and a second gap is left between the other end of the first partition and the side wall of the second side beam, one end of the second partition is sealedly connected to the side wall of the second side beam, and a third gap is left between the other end of the second partition and the side wall of the first side beam.

8. The battery pack lower shell according to claim 1, characterized in that: The second liquid inlet end is connected to a liquid inlet connector, and the second liquid outlet end is connected to a liquid outlet connector. The liquid inlet connector and the liquid outlet connector are located on the same side of the lower shell of the battery pack.

9. The battery pack lower shell according to claim 1, characterized in that: The battery pack lower shell also includes two end beams distributed along the first direction, and two ends of the end beams are respectively connected to the first side beam and the second side beam.

10. A battery pack, characterized in that: Comprising a battery pack lower shell as described in any one of claims 1 to 9.

11. The battery pack according to claim 10, characterized in that: The battery pack further includes a battery cell, and the battery cell is placed on the cooling plate.

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