Battery pack lower shell and battery pack

Abstract

The application relates to the technical field of battery packs, and provides a battery pack lower shell and a battery pack. The battery pack lower shell comprises a shell main body and a plurality of partitions, each partition is arranged in the shell main body, and the shell main body is divided into a plurality of battery cell placing grooves by the partitions; wherein a communication channel is arranged on part of the partitions and is arranged through the width direction of the shell main body, and a fluid for cooling the partitions flows in each communication channel. The battery pack lower shell can avoid the influence of the cooling fluid on the service life of the battery pack, and is beneficial to improving the use quality of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a lower housing of a battery pack and a battery pack. Background Technology

[0002] With the continuous development of the new energy industry, the design of battery packs is also constantly changing. During the use of battery packs, a significant amount of heat is generally generated; therefore, cooling structures are incorporated within the battery pack to regulate its internal temperature.

[0003] Currently, common cooling structures include liquid cooling and air cooling. Some air-cooled battery packs are designed to use external air as the cooling fluid, allowing direct contact between the air and the battery cells and electrical components. However, this can cause moisture from the air to enter the battery pack, affecting insulation and corroding the cells and components, thus shortening the battery pack's lifespan and negatively impacting its overall performance. Utility Model Content

[0004] In view of this, this application aims to provide a lower casing for a battery pack to improve the quality of battery pack use.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] A battery pack lower housing includes a housing body and a plurality of partitions disposed within the housing body, each partition dividing the interior of the housing body into a plurality of cell placement slots;

[0007] At least a portion of the partitions are provided with communicating channels that extend through the width of the shell body, and fluid for cooling the partitions flows through each of the communicating channels.

[0008] Furthermore, the inlet of each of the connecting channels is located on one side of the width direction of the shell body, and the outlet of each of the connecting channels is located on the other side of the width direction of the shell body; a first channel and a second channel are respectively provided on both sides of the width direction of the shell body, the first channel is connected to the inlet of each of the connecting channels, and the second channel is connected to the outlet of each of the connecting channels.

[0009] Furthermore, the shell body has end plates located at both ends along its length, and at least one of the end plates forms an electrical cavity with an adjacent partition, the electrical cavity being used to house electrical components.

[0010] Furthermore, each of the end plates and the adjacent partition plates has an electrical cavity formed therein, one of the electrical cavities being used to house the BMS module in the electrical assembly, and the other electrical cavity being used to house the BDU module in the electrical assembly.

[0011] Furthermore, along the height direction of the partition, the top of the partition is provided with a clearance groove, which is used for the connectors connecting two adjacent battery cell placement slots to pass through.

[0012] Furthermore, there are two clearance slots arranged along the length of the partition, with the two clearance slots respectively arranged at both ends of the top of the partition.

[0013] Furthermore, the partition is provided with a turbulence-disrupting part located within the connecting channel, which is used to disturb the airflow passing through the connecting channel.

[0014] Furthermore, the flow-disrupting part includes a plurality of first flow-disrupting elements and a plurality of second flow-disrupting elements; the first flow-disrupting elements and the second flow-disrupting elements are arranged at intervals along the height direction of the partition in the communicating channel.

[0015] Furthermore, the first spoiler is any one of a boss, a fin, and a corrugated plate; and / or, the second spoiler is any one of a boss, a fin, and a corrugated plate.

[0016] Compared with related technologies, this application has the following advantages:

[0017] (1) The lower housing of the battery pack described in this application, through the setting of the partition, facilitates the separation of multiple cell placement slots inside the housing body, which is convenient for the arrangement of cells. By arranging the connecting channels in the partition, fluid flow is facilitated, thereby cooling the partition. The cooling of the partition indirectly cools the cells arranged in the cell placement slots. Furthermore, through the setting of the partition, the cooling fluid does not come into contact with the cells and electrical components inside the battery pack, thus avoiding the impact on the cells and electrical components, which is conducive to improving the service life of the battery pack and helps to improve the quality of battery pack use.

[0018] (2) The first channel and the second channel are respectively arranged on both sides of the shell body along the width direction of the shell body, which facilitates the flow of fluid in the connecting channel and allows the fluid to flow from one side of the shell body to the other side of the shell body along the connecting channel, which facilitates the full cooling of the battery cells in the battery cell placement slot and is conducive to design and implementation.

[0019] (3) By forming an electrical cavity between the end plate and the partition connected thereto, it is convenient to arrange electrical components in the lower housing. The structure is simple and facilitates design and implementation.

[0020] (4) By forming two electrical cavities between the two end plates and the corresponding partitions, it is convenient to arrange the BMS module and BDU module in the electrical components separately, which can realize the strong and weak electrical isolation of the electrical components, improve the safety of the battery pack, and facilitate the design and implementation.

[0021] (5) By setting a clearance groove on the top of the partition, it is easy to connect the cells in the slots of two adjacent cells. The structure is simple and easy to design and implement.

[0022] (6) By arranging two clearance slots on the top of the partition, it is easy to adapt to different cell connection methods, which helps to improve the applicability of the battery pack lower casing in this application and facilitates design and implementation.

[0023] (7) By setting the turbulence part, the fluid is disturbed to form turbulence when it flows through the connecting channel, and the contact area between the fluid and the partition is increased, which helps to improve the cooling effect on the partition and thus improve the cooling effect on the battery cell.

[0024] (8) By including multiple first turbulence elements and multiple second turbulence elements arranged at intervals along the height direction of the partition, it is easier to increase the turbulence position in the partition, which is conducive to better improving the cooling effect.

[0025] (9) By making the first and second baffles any of the bosses, fins and corrugated plates, it is easy to enrich the configuration of the baffles. At the same time, it is easy to arrange a variety of baffles in the connecting channel, which is conducive to better improving the cooling effect.

[0026] This application also proposes a battery pack, which includes a lower housing as described above.

[0027] The battery pack described in this application has the same beneficial effects as the lower casing of the battery pack described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the lower housing of the battery pack according to an embodiment of this application;

[0030] Figure 2 This is an exploded view of the lower casing of the battery pack described in the embodiments of this application;

[0031] Figure 3 This is a schematic diagram of the shell body structure described in the embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the structure of the partition with a communicating channel described in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the internal structure of the partition with a communicating channel described in an embodiment of this application;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Shell body;

[0036] 101. End plate; 102. Side plate; 103. Bottom plate;

[0037] 2. Partition; 3. Cell placement slot; 4. Connecting channel;

[0038] 5. First channel; 6. Second channel; 7. Electrical cavity; 8. Electrical components; 9. Clearance groove;

[0039] 10. Aerodynamic spoiler;

[0040] 1001, First spoiler; 1002, Second spoiler. Detailed Implementation

[0041] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0043] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0045] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0047] The first aspect of this application provides a lower housing for a battery pack, which is used in a battery pack and is mainly used to protect the battery cells and electrical components disposed in the battery pack. The lower housing of the battery pack in this embodiment, with its innovative structural design, can isolate fluid from the battery cells and electrical components in the battery pack, thereby improving the service life of the battery pack and enhancing the quality of use of the battery pack.

[0048] In related technologies, with the development of the new energy industry, the design of battery packs is also constantly changing. A battery pack is an energy storage device that stores and releases energy through battery cells. A large amount of heat is generated during the energy release and storage process, so a cooling structure is set up inside the battery pack to regulate the temperature inside the battery pack.

[0049] Currently, temperature regulation methods within battery packs generally include liquid cooling and air cooling. Some air-cooled battery packs directly introduce outside air into the pack, allowing heat exchange between the airflow and the battery cells to cool them. However, if the outside air is humid, it contains moisture that can affect the insulation within the battery pack and adhere to the electrical components. Over time, this moisture can corrode the battery cells and electrical components, reducing their lifespan and potentially causing short circuits, thus negatively impacting the overall performance of the battery pack.

[0050] In view of this, in order to overcome the shortcomings of the related technology, in the lower housing of the battery pack of this embodiment, a combination of Figures 1 to 3 As shown, the overall design includes a shell body 1 and a partition 2.

[0051] Multiple partitions 2 are disposed inside the shell body 1, dividing the interior of the shell body 1 into multiple cell placement slots 3, and at least a portion of the partitions 2 have connecting channels 4 arranged through the width direction of the shell body 1, and fluid for cooling the partitions 2 flows through each connecting channel 4.

[0052] Therefore, by setting the partition 2, it is easy to divide the inside of the shell body 1 into multiple cell placement slots 3, which facilitates the arrangement of the cells. By arranging the connecting channel 4 in the partition 2, fluid flow is facilitated, thereby cooling the partition 2. The cooling of the partition 2 indirectly cools the cells arranged in the cell placement slots 3. Furthermore, by setting the partition 2, the cooling fluid does not come into contact with the cells and electrical components 8 in the battery pack, avoiding any impact on the cells and electrical components 8, which helps to improve the service life of the battery pack and improve the quality of battery pack use.

[0053] Based on the above overall introduction, specifically, as an exemplary structural form, the shell body 1 of this embodiment still consists of... Figures 1 to 3 As shown, it generally includes an end plate 101, a side plate 102, and a bottom plate 103.

[0054] The upper end plate 101 is arranged along the length of the shell body 1, the side plate 102 is connected between the two end plates 101, and the bottom plate 103 is assembled below the end plates 101 and the side plates 102, serving as the main structure of the shell body 1. The shell body 1 with internal space is formed by the two end plates 101, the two side plates 102 and the bottom plate 103.

[0055] In specific implementation, the end plate 101, side plate 102 and bottom plate 103 serve as the main structural components of the shell body 1, and are usually made of high-strength plates (such as aluminum alloy plates). Considering the lightweight design of the shell body 1, the end plate 101, side plate 102 and bottom plate 103 can also be provided with cavities inside, and reinforcing structures can be arranged in the cavities to ensure structural strength. The reinforcing structures can be, for example, reinforcing ribs or reinforcing tubes set in the cavities. Based on the above-mentioned setting of reinforcing ribs and reinforcing tubes, the structural strength of the shell body 1 can be improved while ensuring the lightweight design requirements of the shell body 1.

[0056] The connections between the end plate 101 and the side plate 102, the end plate 101 and the bottom plate 103, and the side plate 102 and the bottom plate 103 can refer to the conventional connection methods (such as welding) in the existing battery pack lower housing, and will not be described in detail here.

[0057] Furthermore, in practical implementation, the partitions 2 can be arranged at intervals along the length of the main body 1 to form a cell placement groove 3 within the main body 1. The method of fixing the cells within the cell placement groove 3 can also refer to conventional fixing methods in existing battery packs (such as adhesive bonding), which will not be elaborated here. Of course, when arranging some special types of cells, corresponding fixing structures can be set within the cell placement groove 3 to fix the cells within it. For example, for pouch cells, a tab bracket can be set at the tab to fix the pouch cell within the cell placement groove 3.

[0058] Preferably, in order to improve the energy density of the battery pack, two battery cells can be placed in the same cell placement slot 3, and an elastic layer (such as elastic foam) can be placed between the two battery cells. Before the battery cells are installed into the cell placement slot 3, an external force is applied to the two battery cells to compress the elastic layer. After the battery cells are installed into the cell placement slot 3, under the action of the elastic layer, the surfaces of the two battery cells that are in contact with the corresponding separator 2 can abut against the separator 2, so as to better improve the cooling effect of the separator 2 on the battery cells.

[0059] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, have the inlet of each connecting channel 4 located on one side of the width direction of the shell body 1, and the outlet of each connecting channel 4 located on the other side of the width direction of the shell body 1, with a first channel 5 and a second channel 6 arranged on both sides of the width direction of the shell body 1 respectively. In this case, the first channel 5 is connected to the inlet of each connecting channel 4, and the second channel 6 is connected to the outlet of each connecting channel 4.

[0060] It is understandable that the first channel 5 and the second channel 6 are arranged on both sides of the shell body 1 along the width direction of the shell body 1, which facilitates the flow of fluid in the connecting channel 4 and allows the fluid to flow from one side of the shell body 1 to the other side of the shell body 1 along the connecting channel 4, which facilitates the full cooling of the battery cells in the battery cell placement slot 3 and is conducive to design and implementation.

[0061] In specific implementation, the partitions 2 can be arranged at intervals along the length of the shell body 1, and the two ends of each partition 2 abut against the inner wall of the side plate 102 of the shell body 1. At this time, the side plate 102 of the shell body 1 is provided with a connecting port corresponding to the inlet and outlet of the connecting channel 4. The inlet and outlet of each connecting channel 4 are connected to the first channel 5 and the second channel 6 respectively through the corresponding connecting port.

[0062] It is worth mentioning that the fluid in the aforementioned connecting channel 4 can be a cooling medium commonly used in existing battery pack cooling systems, such as coolant, cooling gas, or air. For battery packs with relatively low cooling requirements, air is preferred as the cooling medium. A fan is positioned at one end of the first channel 5, and an opening is located at the end of the second channel 6 away from the fan. Air is drawn into the second channel 6 by the fan's suction, flows through the connecting channel 4, passes through the partition 2, cools the battery cells through heat transfer via the partition 2, and is then discharged through the first channel 5. Conversely, when the fan blows air, it is discharged from the end opening of the second channel 6.

[0063] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, form an electrical cavity 7 between one end plate 101 of the housing body 1 and a partition 2 adjacent to the end plate 101, and the electrical cavity 7 is used to house electrical components 8.

[0064] It is understandable that by forming an electrical cavity 7 between the end plate 101 and the partition plate 2 connected thereto, the electrical components 8 can be arranged in the lower housing, the structure is simple, and it is helpful for design and implementation.

[0065] The electrical components 8 mentioned above may include, for example, the supporting components required for the battery management system of the battery pack, such as the BMS module and BDU module. The connection between the electrical components 8 and the battery cells can refer to the conventional connection methods in existing battery packs (such as wiring harness connection methods), and will not be described in detail here.

[0066] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, allow the two end plates 101 of the shell body 1 to form an electrical cavity 7 between them and the adjacent partition 2.

[0067] At this point, one electrical cavity 7 is used to house the BMS module in the electrical assembly 8, and the other electrical cavity 7 is used to house the BDU module in the electrical assembly 8. It is understood that by forming two electrical cavities 7 between the two end plates 101 and the corresponding partitions 2, it is convenient to separate the BMS module and BDU module in the electrical assembly 8, achieving strong and weak current isolation in the electrical assembly 8, which is beneficial for improving the safety of the battery pack and facilitating design and implementation.

[0068] In practical implementation, the specific structural forms of the BMS module and BDU module can be referenced from the relevant modules in the existing battery pack, and will not be elaborated here.

[0069] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, provide a clearance groove 9 on the partition 2.

[0070] The clearance slots 9 are arranged along the height of the partition 2 at the top of the partition 2, and the clearance slots 9 are used for connecting components, such as connecting harnesses, busbars, or acquisition boards, to pass through when connecting two adjacent battery cell placement slots 3. It can be understood that by setting clearance slots 9 at the top of the partition 2, it is convenient to connect the battery cells in two adjacent battery cell placement slots 3, and the structure is simple and easy to design and implement.

[0071] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, taking the partition 2 with a clearance groove 9 as an example, this embodiment may have two clearance grooves 9 arranged along the length of the partition 2 itself, and the two clearance grooves 9 are respectively arranged at both ends of the top of the partition 2.

[0072] It is understandable that by arranging two clearance slots 9 on the top of the partition 2, it is convenient to adapt to different cell connection methods, which helps to improve the applicability of the battery pack lower casing in this application and facilitates design and implementation. Specifically, when different types of cells are placed in the cell placement slots 3, the connection methods for the cells in the two adjacent cell placement slots 3 are also different, and the connection methods also differ when the series and parallel connection methods of the cells change. Therefore, setting two clearance slots 9 on the top of the partition 2 can accommodate the arrangement requirements of connectors under different connection methods, which is beneficial to the setting effect of the clearance slots 9.

[0073] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the partition 2 having a connecting channel 4 as an example, this embodiment may, for example, provide a turbulence-disrupting part 10 located in the connecting channel 4 on the partition 2, and the turbulence-disrupting part 10 is used to disturb the fluid passing through the connecting channel 4.

[0074] It is understandable that by setting the turbulence section 10, the fluid is disturbed to form turbulence when it flows through the connecting channel 4, and the contact area between the fluid and the partition 2 is increased, thereby improving the cooling effect on the partition 2 and thus improving the cooling effect on the battery cell.

[0075] It should be noted that when the fluid passes through the connecting channel 4, due to the setting of the turbulence part 10, the fluid will collide with the turbulence part 10, thereby changing the flow direction and forming turbulence near the setting position of the turbulence part 10. Through the formation of turbulence, the heat exchange time between the fluid and the baffle 2 is increased, and the heat exchange area between the baffle 2 and the fluid is increased, thereby facilitating the improvement of the cooling effect of the baffle 2.

[0076] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, the example still uses the connection channel 4 with a flow-dispersing part 10. In this embodiment, the flow-dispersing part 10 may include a plurality of first flow-dispersing elements 1001 and a plurality of second flow-dispersing elements 1002.

[0077] The first baffle 1001 and the second baffle 1002 are arranged at intervals along the height direction of the partition 2 in the connecting channel 4. It can be understood that by including a plurality of first baffles 1001 and a plurality of second baffles 1002 arranged at intervals along the height direction of the partition 2 in the baffle part 10, it is convenient to increase the baffle position in the partition 2, which is beneficial to better improve the cooling effect.

[0078] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, the spoiler 10 includes a first spoiler 1001 and a second spoiler 1002. In this embodiment, the first spoiler 1001 and the second spoiler 1002 may be any one of a boss, a fin, and a corrugated plate.

[0079] It is understandable that by making the first baffle 1001 and the second baffle 1002 any of the boss, fins and corrugated plates, it is easy to enrich the arrangement of baffles. At the same time, it is easy to arrange a variety of baffles in the connecting channel 4, which is conducive to better improving the cooling effect.

[0080] In specific implementation, the first flow-deflecting element 1001 can be a plurality of protrusions spaced apart along the fluid flow direction, and the second flow-deflecting element 1002 can be a corrugated plate arranged along the fluid flow direction. Of course, in addition to the first flow-deflecting element 1001 being a protrusion and the second flow-deflecting element 1002 being a corrugated plate, the specific arrangement of the first flow-deflecting element 1001 and the second flow-deflecting element 1002 can be adjusted according to the cooling requirements of the partition 2.

[0081] It is worth noting that, regarding this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still... Figures 1 to 5 As shown, it may include, for example, a shell body 1 and a partition 2.

[0082] The shell body 1 is formed by two end plates 101, two side plates 102, and a bottom plate 103. The end plates 101 are located at both ends of the bottom plate 103 along the length of the shell body 1, and the side plates 102 are located on both sides of the bottom plate 103 along the width of the bottom plate 103. Partitions 2 are arranged along the width of the shell body 1, and the two ends of the partitions 2 abut against the side plates 102. Multiple partitions 2 are arranged at intervals inside the shell body 1 along the length of the shell body 1.

[0083] The battery cell placement slot 3 is formed between two adjacent partitions 2, and an electrical cavity 7 is formed between the end plate 101 and the partition 2 adjacent to the end plate 101. The battery cell placement slot 3 is used to place the battery cell, and the electrical cavity 7 is used to place the electrical assembly 8. Except for the partition 2 forming the electrical cavity 7, the interior of each of the other partitions 2 has a connecting channel 4 arranged through the width of the shell body 1. Two clearance slots 9 are arranged on the top of the partition 2 between two adjacent battery cell placement slots 3.

[0084] The inlet of each connecting channel 4 is located on one side of the shell body 1 along the width direction of the shell body 1, and the outlet of each connecting channel 4 is located on the other side of the shell body 1 along the width direction of the shell body 1. The first channel 5 and the second channel 6 are respectively arranged on both sides of the shell body 1.

[0085] The inlet of each connecting channel 4 is connected to the first channel 5, and the outlet of each connecting channel 4 is connected to the second channel 6. Each connecting channel 4 is provided with a flow-disrupting part 10, and each flow-disrupting part 10 includes a plurality of first flow-disrupting elements 1001 and a plurality of second flow-disrupting elements 1002 arranged at intervals along the height direction of the partition 2. The first flow-disrupting elements 1001 are bosses, and the second flow-disrupting elements 1002 are corrugated plates.

[0086] In the preferred embodiment of the lower housing of the battery pack described above, the specific configuration and arrangement of the housing body 1, the baffle, the clearance groove 9 and the turbulence part 10, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the housing body 1, the baffle, the clearance groove 9 and the turbulence part 10, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0087] In this embodiment, the lower housing of the battery pack, with the above-mentioned configuration, can form a connecting channel 4 for the flow of cooling fluid inside the housing body 1, thereby isolating the cooling fluid from the battery cells and electrical components 8. The battery cell placement slot 3 is formed by the partition 2. By arranging the connecting channel 4 in the partition 2 that forms the battery cell placement slot 3, the cooling effect on the battery cells can be improved, avoiding the influence of the cooling fluid on the battery cells and electrical components 8, which is conducive to improving the service life of the battery pack and enhancing the quality of battery pack use.

[0088] An embodiment of the second aspect of this application provides a battery pack including a lower housing as described above.

[0089] In the battery pack of this embodiment, the lower housing of the battery pack serves as the main housing part and main structure of the battery pack, and it is generally provided with a top plate (also referred to as the upper housing of the battery pack). Furthermore, the lower housing of the battery pack and the top plate are usually detachably connected, and a sealing structure is arranged between the top plate and the lower housing of the battery pack.

[0090] Furthermore, in specific applications, when the battery pack in this embodiment is arranged on a vehicle, the first channel 5 of the lower housing of the battery pack can, for example, be connected to the vehicle cabin. By arranging an exhaust fan in the second channel 6, the air in the cabin is used as a cooling fluid and flows through the first channel 5, the connecting channel 4 and the second channel 6 to cool the cells in the cell placement slot 3.

[0091] At this time, the battery cells in the battery cell placement slot 3 can be grouped in pairs. Each battery cell placement slot 3 holds one group of battery cells with the larger surface of the battery cells facing the partition 2. An elastic layer is arranged between the two battery cells in the same group. Before each group of battery cells is placed into the battery cell placement slot 3, an external force is applied to the battery cells to compress the elastic layer. After each group of battery cells is placed in the battery cell placement slot 3, the elastic layer presses the larger surface of each battery cell facing the corresponding side partition 2 against the partition 2, thereby improving the cooling effect of the battery cells.

[0092] The battery pack of this embodiment, by having a lower housing as described above and a connecting channel 4 arranged in the partition 2, can improve the cooling effect on the battery cells, avoid the influence of cooling fluid on the battery cells and electrical components 8, and thus help to improve the service life of the battery pack and enhance the quality of battery pack use.

[0093] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the protection scope of the claims of this application.

Claims

1. A lower housing for a battery pack, characterized in that: It includes a shell body and a plurality of partitions disposed within the shell body, each partition dividing the interior of the shell body into a plurality of cell placement slots; At least a portion of the partitions are provided with communicating channels that extend through the width of the shell body, and fluid for cooling the partitions flows through each of the communicating channels.

2. The lower housing of the battery pack according to claim 1, characterized in that: The inlet of each of the connecting channels is located on one side of the width direction of the shell body, and the outlet of each of the connecting channels is located on the other side of the width direction of the shell body; The shell body has a first channel and a second channel on both sides in the width direction. The first channel is connected to the inlet of each of the connecting channels, and the second channel is connected to the outlet of each of the connecting channels.

3. The lower housing of the battery pack according to claim 1, characterized in that: The shell body has end plates located at both ends along its length, and an electrical cavity is formed between at least one of the end plates and an adjacent partition plate, the electrical cavity being used to house electrical components.

4. The lower housing of the battery pack according to claim 3, characterized in that: Each of the end plates and the adjacent partition plate has an electrical cavity formed therein. One of the electrical cavities is used to house the BMS module in the electrical assembly, and the other electrical cavity is used to house the BDU module in the electrical assembly.

5. The lower housing of the battery pack according to claim 1, characterized in that: Along the height direction of the partition, the top of the partition is provided with a clearance groove, which is used for the connectors connecting two adjacent battery cell placement slots to pass through.

6. The lower housing of the battery pack according to claim 5, characterized in that: The clearance grooves are two in number, arranged along the length of the partition, and the two clearance grooves are respectively arranged at both ends of the top of the partition.

7. The lower housing of the battery pack according to any one of claims 1-6, characterized in that: The partition is provided with a flow-disrupting part located within the connecting channel, which is used to disturb the fluid passing through the connecting channel.

8. The lower housing of the battery pack according to claim 7, characterized in that: The aerodynamic spoiler includes a plurality of first aerodynamic elements and a plurality of second aerodynamic elements; The first and second baffles are arranged at intervals along the height direction of the partition within the connecting channel.

9. The lower housing of the battery pack according to claim 8, characterized in that: The first spoiler is any one of a boss, a fin, and a corrugated plate; and / or, The second spoiler is any one of a boss, a fin, and a corrugated plate.

10. A battery pack, characterized in that: The battery pack includes the lower housing of the battery pack as described in any one of claims 1-9.

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