Lower box body and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a lower box body and a battery pack. The lower box body comprises a bottom plate, end plates arranged at the two ends of the bottom plate in the length direction and side plates arranged on the two sides of the bottom plate in the width direction, a cavity is defined by the bottom plate, the side plates and the end plates, and a plurality of partition plates are arranged in the cavity to divide the cavity into a plurality of battery cell containing cavities; a first cooling cavity is formed in each side plate, a second cooling cavity communicated with the first cooling cavities on the two sides is formed in the bottom plate, a third cooling cavity communicated with the first cooling cavities on the two sides is formed in each end plate, and a fourth cooling cavity communicated with the first cooling cavities on the two sides is formed in each partition plate. The lower box body disclosed by the utility model can be used for improving the cooling effect on each battery cell, so that the comprehensive performance of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a lower box. BACKGROUND

[0002] With the continuous popularization and development of new energy vehicles, the charge-discharge rate of power battery pack is also continuously improved. At present, the battery pack on the market basically relies on stamping cold plate cooling, and the cooling form and efficiency are limited, which leads to that the charge-discharge rate of the whole pack cannot be too high, especially the customer's requirement for fast charging time is getting shorter and shorter, which requires higher rate fast charging performance. However, equipping the battery pack with higher rate fast charging performance not only makes the temperature of the battery cell rise fast, but also leads to the abnormal temperature of the busbar, so a more efficient cooling form is needed to meet this demand. SUMMARY

[0003] Therefore, the utility model aims at providing a lower box which can improve the cooling effect of the battery pack.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] A lower box comprises a bottom plate, end plates arranged at both ends of the length direction of the bottom plate, and side plates arranged at both sides of the width direction of the bottom plate, a cavity is formed between the bottom plate, each side plate and each end plate, and a plurality of partition plates are arranged in the cavity to separate the cavity into a plurality of battery cell accommodating cavities;

[0006] Each side plate is formed with a first cooling cavity, the bottom plate is provided with a second cooling cavity communicating with the first cooling cavities on both sides, each end plate is formed with a third cooling cavity communicating with the first cooling cavities on both sides, and each partition plate is formed with a fourth cooling cavity communicating with the first cooling cavities on both sides.

[0007] Further, each side plate comprises two first plate bodies arranged opposite to each other in the width direction of the lower box, and the first cooling cavity is provided with a first turbulence part connected with the two first plate bodies, and the first turbulence part is used for disturbing the flow of the cooling liquid.

[0008] Further, the first turbulence part is a plurality of parts arranged at intervals in the length direction of the lower box, each first turbulence part comprises a plurality of first turbulence plates, and each first turbulence plate in at least two adjacent first turbulence parts is arranged in a staggered manner in the height direction of the lower box.

[0009] Further, the second cooling cavity is provided with a plurality of second turbulence portions, each of the second turbulence portions separates the second cooling cavity into a plurality of first flow channels, and each of the first flow channels is communicated with the first cooling cavities on both sides.

[0010] Further, each of the second turbulence portions has a second turbulence plate arranged along the width direction of the lower box body, each of the second turbulence plates is arranged along the length direction of the lower box body at intervals, and / or each of the second turbulence plates is in a wave shape.

[0011] Further, the third cooling cavity is provided with a plurality of third turbulence portions arranged at intervals along the height direction of the lower box body, each of the third turbulence portions separates the third cooling cavity into a plurality of second flow channels, each of the second flow channels is communicated with the first cooling cavities on both sides, and / or the fourth cooling cavity is provided with a plurality of fourth turbulence portions arranged at intervals along the height direction of the lower box body, each of the fourth turbulence portions separates the fourth cooling cavity into a plurality of third flow channels, and each of the third flow channels is communicated with the first cooling cavities on both sides.

[0012] Further, each of the third cooling cavities is communicated with the second cooling cavity, and / or each of the fourth cooling cavities is communicated with the second cooling cavity.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The lower box body has the first cooling cavities arranged in each side plate, the second cooling cavities arranged in the bottom plate and communicated with the first cooling cavities on both sides, the third cooling cavities arranged in each end plate and communicated with the first cooling cavities on both sides, and the fourth cooling cavities arranged in each partition plate and communicated with the first cooling cavities on both sides, so that the cooling flow channels are formed between each side plate and the bottom plate, between each side plate and each end plate, and between each side plate and each partition plate, at least five surfaces of the battery cell placed in each battery cell accommodating cavity can be cooled, the cooling effect of each battery cell is improved, the cooling effect of the battery pack is improved, and the comprehensive performance of the battery pack is improved.

[0015] In addition, the first turbulence portions are arranged, the strength of each side plate and the lower box body is improved, the turbulence effect is achieved, the structural strength of the lower box body is improved, the uniformity of the internal cooling liquid flow is ensured, the utilization rate of the cooling liquid is improved, and the cooling effect of each battery cell is ensured.

[0016] Furthermore, the design incorporates a first spoiler plate in the first flow section and a second spoiler plate in the second flow section, resulting in a simple structure that is easy to manufacture and facilitates cost reduction. The wave-shaped design of each second spoiler plate enhances the flow path of each first flow channel, improving coolant utilization. The fact that each third cooling chamber is connected to the second cooling chamber, and each fourth cooling chamber is also connected to the second cooling chamber, reduces coolant flow resistance and ensures smooth coolant flow.

[0017] Another objective of this invention is to provide a battery pack, including the lower housing as described above.

[0018] Furthermore, it also includes battery cells disposed in each of the battery cell receiving cavities; adjacent two battery cells are connected by a busbar, and each of the partitions and the corresponding busbars are provided with a thermal pad.

[0019] Furthermore, in the length direction of the lower housing, the length D1 of each heat-conducting pad and the length D2 of the corresponding busbar satisfy the following: D1:D2 = 1.2-1.5; and / or, it also includes a cover plate disposed on the lower housing, the cover plate sealing the cavity.

[0020] The battery pack of this utility model is provided with the aforementioned lower housing, which has the same beneficial effects as the traditional technology, and will not be described in detail here.

[0021] Furthermore, by setting up thermal pads, each busbar can be cooled using the partitions, thereby cooling the terminal area of ​​each battery cell. Combined with the first, second, third, and fourth cooling chambers, cooling can be achieved on all six sides of each battery cell, improving the cooling effect. This ensures that, along the length of the lower housing, the length D1 of each thermal pad and the corresponding length D2 of the busbar satisfy the following ratio: D1:D2 = 1.2-1.5, further enhancing the thermal conductivity of each busbar. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the battery pack described in an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective;

[0025] Figure 3 for Figure 1 Exploded view of the structure shown;

[0026] Figure 4 Structure diagram of the lower box body according to the embodiment of the present application;

[0027] Figure 5 Structure diagram of the side plate according to the embodiment of the present application;

[0028] Figure 6 Structure diagram of the bottom plate according to the embodiment of the present application;

[0029] Figure 7 Structure diagram of the partition plate according to the embodiment of the present application;

[0030] Figure 8 Structure diagram of the battery pack without the cover plate according to the embodiment of the present application;

[0031] Figure 9 Structure diagram of the guiding pad and the busbar according to the embodiment of the present application; Figure 8 Sectional view along direction A-A;

[0032] Figure 10 Structure diagram of the guiding pad and the busbar according to the embodiment of the present application;

[0033] Explanation of reference signs:

[0034] 10, lower box body;

[0035] 11, bottom plate; 111, second cooling cavity; 1111, first flow channel; 112, second spoiler plate;

[0036] 12, end plate;

[0037] 13, side plate; 131, first cooling cavity; 132, first spoiler plate; 134, first pipeline; 135, second pipeline;

[0038] 14, partition plate; 141, fourth cooling cavity; 1411, third flow channel; 142, fourth spoiler plate;

[0039] 15, cell accommodating cavity; 16, accommodating groove;

[0040] 20, cover plate; 30, busbar; 40, heat-conducting pad; 50, cell; 60, fastener; 70, sealing pad. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, and circuits are omitted so as not to obscure the description of the present application with unnecessary detail.

[0043] In the description of the present application, it should be explained that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application. The indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second", etc. appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connection", "connection", "connector" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0045] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0046] Embodiment one

[0047] The present embodiment relates to a lower box body 10, which can be beneficial to solve the problem of poor cooling effect of the battery cell 50, improve the cooling effect of the battery pack, especially the cooling effect of the battery pack equipped with higher rate fast charging performance.

[0048] As shown in the overall structure, Figures 1 to 10 The lower box body 10 of the present embodiment includes a bottom plate 11, end plates 12 arranged at both ends of the length direction of the bottom plate 11, and side plates 13 arranged at both sides of the width direction of the bottom plate 11. The bottom plate 11, each side plate 13 and each end plate 12 are combined to form a cavity, and a plurality of partitions 14 are arranged in the cavity to separate the cavity into a plurality of battery cell accommodating cavities 15.

[0049] And, each side plate 13 is formed with a first cooling cavity 131, the bottom plate 11 is provided with a second cooling cavity 111 communicating with the first cooling cavities 131 on both sides, each end plate 12 is formed with a third cooling cavity communicating with the first cooling cavities 131 on both sides, and each partition plate 14 is formed with a fourth cooling cavity 141 communicating with the first cooling cavities 131 on both sides.

[0050] At this time, as above, by providing the first cooling cavities 131 in each side plate 13, the second cooling cavities 111 in the bottom plate 11 communicating with the first cooling cavities 131 on both sides, the third cooling cavities in each end plate 12 communicating with the first cooling cavities 131 on both sides, and the fourth cooling cavities 141 in each partition plate 14 communicating with the first cooling cavities 131 on both sides, cooling flow channels are formed between each side plate 13 and the bottom plate 11, between each side plate 13 and each end plate 12, and between each side plate 13 and each partition plate 14, so that at least five faces of each battery cell 50 placed in each battery cell accommodating cavity 15 can be cooled, improving the cooling effect of each battery cell 50, i.e. improving the cooling effect of the battery pack, thereby facilitating the improvement of the overall performance of the battery pack.

[0051] Based on the above, in detail, in the present embodiment, a first pipe 134 communicating with the first cooling cavity 131 corresponding thereto is provided on one side plate 13, and a second pipe 135 communicating with the first cooling cavity 131 corresponding thereto is provided on the other side plate 13, one of the first pipe 134 and the second pipe 135 is a cooling liquid supply pipe, and the other of the first pipe 134 and the second pipe 135 is a cooling liquid output pipe. Specifically, the first pipe 134 can be a cooling liquid supply pipe to connect the liquid outlet end of the cooling liquid supply device, and the second pipe 135 can be a cooling liquid output pipe to connect the liquid inlet end of the cooling liquid supply device.

[0052] At the same time, as a preferred implementation form, in the present embodiment, one battery cell 50 is placed in each battery cell accommodating cavity 15, so that by using the first cooling cavity 131, the second cooling cavity 111, the third cooling cavity and the fourth cooling cavity 141, the effect of cooling five faces of each battery cell 50 is obtained. For example, two end faces of any one battery cell 50 can be cooled by the first cooling cavity 131, the bottom face of the battery cell 50 can be cooled by the second cooling cavity 111, and the two side faces of the battery cell 50 can be cooled by the fourth cooling cavities 141 on both sides (of course, the battery cell 50 close to the end plate 12 abuts against the end plate 12 on one side and abuts against the partition plate 14 on the other side, so the two side faces of the battery cell 50 are cooled by the third cooling cavity in the end plate 12 and the fourth cooling cavity 141 in the partition plate 14, respectively).

[0053] Moreover, it is worth mentioning that, in the embodiment, the plurality of battery cell accommodating cavities 15 are formed by the partitions 14, so that the battery cells 50 can be directly embedded in the box, which has the advantage of effectively preventing the battery cells 50 from being ejected, and in combination with the cooling effect of the five surfaces, the severity of thermal runaway can be reduced.

[0054] Furthermore, it should be noted that the direction-related expressions in the embodiment are only exemplary descriptions of the embodiment. In actual implementation, the direction expressions in the embodiment vary with the setting direction of the lower box 10, that is, the directions in the embodiment refer to a relative coordinate system with the lower box 10 as the reference, for example Figure 1 the length direction shown in the above figures is the length direction of the lower box 10.

[0055] In the embodiment, as a preferred implementation form, referring to Figure 5 and Figure 7 , each side plate 13 includes two first plate bodies arranged opposite in the width direction of the lower box 10, and the first cooling cavity 131 is provided with a first turbulence portion connected to both first plate bodies, which is used for turbulating the flowing cooling liquid. In this way, the strength of each side plate 13 and the lower box 10 is improved, and the turbulence effect is also achieved, which improves the structural strength of the lower box 10, ensures the uniformity of the internal cooling liquid flow, improves the utilization rate of the cooling liquid, and ensures the cooling effect on each battery cell 50.

[0056] In actual implementation, in the embodiment, as a preferred implementation form, the first turbulence portion is a plurality of first turbulence portions arranged at intervals in the length direction of the lower box 10, each first turbulence portion includes a plurality of first turbulence plates 132, and each first turbulence plate 132 in at least two adjacent first turbulence portions is arranged in a staggered manner in the height direction of the lower box 10. In this way, the layout of the first turbulence plates 132 can be optimized to improve the turbulence effect, and the structure is simple, easy to manufacture, and conducive to cost reduction design.

[0057] At the same time, referring to Figure 6 , Figure 8 and Figure 9 , as a preferred implementation form, the second cooling cavity 111 is provided with a plurality of second turbulence portions in the embodiment, each second turbulence portion separates the second cooling cavity 111 into a plurality of first flow channels 1111, and each first flow channel 1111 communicates with two first cooling cavities 131.

[0058] It can be understood that the second turbulence part is arranged, and the second turbulence part separates the second cooling cavity 111 into a plurality of first flow channels 1111, which can improve the utilization rate of the cooling liquid and improve the cooling effect. In particular, the arrangement of the plurality of first flow channels 1111 can also improve the cooling effect of each battery cell 50, and at the same time, the structural strength of the bottom plate 11 can be improved, thereby improving the overall structural strength of the lower box 10.

[0059] In a specific implementation, the bottom plate 11 of the embodiment includes two second plate bodies arranged opposite to each other, and the second cooling cavity 111 and the first flow channels 1111 are formed between the two second plate bodies. As a preferred implementation form, each second turbulence part has a second turbulence plate 112 arranged along the width direction of the lower box 10, and each second turbulence plate 112 is arranged along the length direction of the lower box 10. Specifically, the two sides of each second turbulence plate 112 in the height direction (i.e., the height direction of the lower box 10) are connected to the upper and lower second plate bodies, respectively.

[0060] Further, in the embodiment, as a preferred implementation form, each second turbulence plate 112 is wavy. Here, when each second turbulence plate 112 is wavy, it is beneficial to improve the flow path of each first flow channel 1111 and improve the utilization rate of the cooling liquid.

[0061] Of course, in addition to being wavy, each second turbulence plate 112 of the embodiment can also be set and adjusted according to the path planning of each first flow channel 1111 or the cooling demand of the bottom plate 11, for example, it can be set to be linear or "W" shaped, which will not be described here.

[0062] In addition, in the embodiment, as a preferred implementation form, a plurality of third turbulence parts are arranged along the height direction of the lower box 10 in the third cooling cavity, each third turbulence part separates the third cooling cavity into a plurality of second flow channels, and each second flow channel communicates with the first cooling cavities 131 on both sides.

[0063] By arranging each third turbulence part, the strength of each end plate 12 and the lower box 10 is improved, and the effect of turbulence is also achieved. The structural strength of the lower box 10 is improved while ensuring the uniformity of the internal cooling liquid flow, improving the utilization rate of the cooling liquid, and ensuring the cooling effect of each battery cell 50.

[0064] Similarly, in order to improve the structural strength of each partition plate 14 and the cooling effect of each battery cell 50, as a preferred implementation form, a plurality of fourth turbulence parts are arranged along the height direction of the lower box 10 in the fourth cooling cavity 141, each fourth turbulence part separates the fourth cooling cavity 141 into a plurality of third flow channels 1411, and each third flow channel 1411 communicates with the first cooling cavities 131 on both sides.

[0065] It should be noted that in this embodiment, the structural shape design of the end plate 12 is basically similar to that of the partition plate 14. The main difference is that the thickness of the end plate 12 is larger than that of the partition plate 14 along the length of the lower housing 10. Therefore, the structural schematic diagram of the end plate 12 in this embodiment can also be referred to Figure 7 and Figure 9 The structural diagram of the partition 14 is as follows: for example, the end plate 12 includes two third plates arranged at intervals along the length of the lower housing 10, and each third flow-disrupting part can be a third flow-disrupting plate connecting the two third plates; the partition 14 includes two fourth plates arranged at intervals along the length of the lower housing 10, and each fourth flow-disrupting part can be a fourth flow-disrupting plate 142 connecting the two fourth plates, etc.

[0066] Of course, the structural shapes of each third and fourth spoiler 142 can be set and adjusted according to the structural strength and cooling effect requirements of each end plate 12 and each baffle 14. For example, each third and fourth spoiler 142 can be set as a straight line, wave, or "W" shape similar to each second spoiler 112. Similarly, each first spoiler 132 can also be set as a straight line, wave, or "W" shape, etc., which will not be elaborated here.

[0067] In addition, in this embodiment, as a preferred implementation, each third cooling chamber is connected to the second cooling chamber 111, and each fourth cooling chamber 141 is connected to the second cooling chamber 111. This arrangement reduces the flow resistance of the coolant and ensures smooth coolant flow. If necessary, this embodiment can also, depending on the design requirements of the coolant flow path, connect only each third cooling chamber to the second cooling chamber 111, or connect each fourth cooling chamber 141 to the second cooling chamber 111.

[0068] In this embodiment, the lower housing 10 has a first cooling cavity 131 in each side plate 13, a second cooling cavity 111 in the bottom plate 11 connecting the first cooling cavities 131 on both sides, a third cooling cavity in each end plate 12 connecting the first cooling cavities 131 on both sides, and a fourth cooling cavity 141 in each partition plate 14 connecting the first cooling cavities 131 on both sides. This allows cooling channels to be formed between each side plate 13 and the bottom plate 11, between each side plate 13 and each end plate 12, and between each side plate 13 and each partition plate 14. This enables cooling of at least five sides of the battery cells 50 placed in each battery cell housing 15, improving the cooling effect of each battery cell 50, that is, improving the cooling effect of the battery pack, and thus improving the overall performance of the battery pack.

[0069] Example 2

[0070] This embodiment relates to a battery pack, which includes the lower housing 10 in Embodiment 1.

[0071] In this embodiment, as a preferred implementation form, referring to Figure 3 , Figure 8 and Figure 9 , the battery pack further comprises battery cells 50 arranged in each cell accommodating cavity 15. Two adjacent battery cells 50 are connected through busbars 30, and each separator 14 and the corresponding busbar 30 are provided with a heat-conducting pad 40.

[0072] Here, by arranging the heat-conducting pad 40, each busbar 30 can be cooled by each separator 14, and then the cooling of the pole region of each battery cell 50 is realized, and then combined with the first cooling cavity 131, the second cooling cavity 111, the third cooling cavity and the fourth cooling cavity 141, the cooling of the six surfaces of each battery cell 50 can be realized, and the cooling effect of each battery cell 50 is improved.

[0073] In this embodiment, as a preferred implementation form, referring to Figure 10 , in the length direction of the lower box body 10, the length D1 of each heat-conducting pad 40 and the length D2 of the corresponding busbar 30 satisfy: D1:D2=1.2-1.5. For example, D1:D2 can be 1.2, 1.3 or 1.5, etc. In this way, in the length direction of the lower box body 10, the length D1 of each heat-conducting pad 40 and the length D2 of the corresponding busbar 30 satisfy: D1:D2=1.2-1.5, which can improve the heat conduction effect of each busbar 30.

[0074] As shown in Figure 1 and Figure 2 , as a preferred implementation form, the battery pack of the embodiment further comprises a cover plate 20 arranged on the lower box body 10, and the cover plate 20 covers the cavity. In specific implementation, the cover plate 20 can be connected with the lower box body 10 through fasteners 60, so as to facilitate the disassembly between the lower box body 10 and the cover plate 20.

[0075] Moreover, in order to ensure the sealing performance of the battery pack, combined with Figure 3 and Figure 4 , the accommodating grooves 16 can be formed on the top of the lower box body 10 (i.e. the top of each side plate 13 and each end plate 12), and the sealing pads 70 are arranged in the accommodating grooves 16, and the fasteners 60 are connected with the lower box body 10 after passing through the cover plate 20 and the sealing pads 70.

[0076] Of course, the fasteners 60 of the embodiment can adopt bolts, and the number and arrangement form of the fasteners 60 can be set and adjusted according to the connection requirements between the cover plate 20 and the lower box body 10, for example, the fasteners 60 are a plurality of fasteners arranged along the circumference of the lower box body 10.

[0077] The battery pack of the embodiment can form a cooling mode similar to indirect immersion by arranging the lower box 10 in the first embodiment, has better cooling effect, and has better structural strength and higher safety of the lower box 10 and the cover plate 20, thereby having better product quality.

[0078] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lower housing, characterized in that: The device includes a base plate, end plates at both ends of the base plate in the length direction, and side plates on both sides of the base plate in the width direction. A cavity is formed between the base plate, each of the side plates and each of the end plates, and a plurality of partitions are provided in the cavity to divide the cavity into a plurality of cell receiving cavities. Each of the side plates has a first cooling cavity, the bottom plate has a second cooling cavity that connects the first cooling cavities on both sides, each of the end plates has a third cooling cavity that connects the first cooling cavities on both sides, and each of the partitions has a fourth cooling cavity that connects the first cooling cavities on both sides.

2. The lower housing according to claim 1, characterized in that: Each of the side panels includes two first plates arranged opposite each other along the width direction of the lower housing, and the first cooling cavity is provided with a first turbulence part connected to both first plates. The first turbulence part is used to turbulent the flow of coolant.

3. The lower housing according to claim 2, characterized in that: The first aerodynamic part consists of a plurality of parts arranged at intervals along the length direction of the lower housing. Each first aerodynamic part includes a plurality of first aerodynamic plates, and at least two adjacent first aerodynamic parts have their first aerodynamic plates staggered along the height direction of the lower housing.

4. The lower housing according to claim 1, characterized in that: The second cooling cavity is provided with a plurality of second turbulence sections, each of which separates the second cooling cavity into a plurality of first flow channels, and each of the first flow channels is connected to the first cooling cavities on both sides.

5. The lower housing according to claim 4, characterized in that: Each of the second spoiler sections has a second spoiler plate arranged along the width direction of the lower housing; Each of the second spoilers is arranged at intervals along the length of the lower housing, and / or each of the second spoilers is wavy.

6. The lower housing according to claim 1, characterized in that: The third cooling chamber is provided with a plurality of third flow-dispersing parts arranged at intervals along the height direction of the lower housing. Each third flow-dispersing part divides the third cooling chamber into a plurality of second flow channels, and each second flow channel is connected to the first cooling chambers on both sides; and / or, The fourth cooling chamber is provided with a plurality of fourth turbulence sections arranged at intervals along the height direction of the lower housing. Each of the fourth turbulence sections separates the fourth cooling chamber into a plurality of third flow channels, and each of the third flow channels is connected to the first cooling chambers on both sides.

7. The lower housing according to any one of claims 1 to 6, characterized in that: Each of the third cooling chambers is connected to the second cooling chamber; and / or, each of the fourth cooling chambers is connected to the second cooling chamber.

8. A battery pack, characterized in that: Includes the lower housing as described in any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: It also includes the battery cells disposed in each of the battery cell receiving cavities; Two adjacent battery cells are connected by a busbar, and each of the partitions and the corresponding busbars are provided with a thermal pad.

10. The battery pack according to claim 9, characterized in that: Along the length of the lower housing, the length D1 of each thermal pad and the corresponding length D2 of the busbar satisfy the following relationship: D1:D2 = 1.2-1.5; and / or, It also includes a cover plate disposed on the lower housing, the cover plate sealing the cavity.

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