Battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery pack and a vehicle, the battery pack comprises a box body, a battery cell module and a diversion assembly; the box body comprises a first side wall and a second side wall which are arranged at intervals in the first direction, the first side wall is provided with an oil return groove, the second side wall is provided with an oil outlet groove, the oil return groove and the oil outlet groove extend in the second direction, and in the third direction, the height of the oil return groove is smaller than that of the oil outlet groove. The first direction intersects with the second direction, and the third direction is perpendicular to the first direction and the second direction; the plurality of battery cell modules are arranged in the box body at intervals along a second direction; the flow guide assemblies are correspondingly arranged between the two adjacent battery cell modules, cooling flow channels are defined by the flow guide assemblies and the battery cell modules, and the cooling flow channels are communicated with the oil return groove and the oil outlet groove. Through the structure, the area of oil in contact with the battery cell module can be increased, the cooling effect and the temperature uniformity are improved, the battery cell module can be directly assembled in the box body, and the assembly difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and a vehicle. Background Technology

[0002] As the charge and discharge rates of battery cell modules continue to increase, their heat generation also increases dramatically. At the same time, the requirements for temperature uniformity and thermal safety of battery cell modules are becoming increasingly stringent.

[0003] However, current cooling solutions for battery cell modules suffer from problems such as assembly difficulties, abnormally high local temperatures, and poor temperature uniformity throughout the package. Utility Model Content

[0004] This application provides a battery pack and a vehicle that can simplify assembly steps, reduce assembly difficulty, and improve temperature uniformity.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a battery pack, which includes a housing, battery cell modules, and a flow guiding assembly; the housing includes a first sidewall and a second sidewall arranged at intervals along a first direction, the first sidewall having an oil return groove, and the second sidewall having an oil outlet groove, both the oil return groove and the oil outlet groove extending along a second direction, and in a third direction, the height of the oil return groove is less than the height of the oil outlet groove; wherein, the first direction intersects the second direction, and the third direction is perpendicular to both the first and second directions; a plurality of battery cell modules are arranged at intervals along the second direction within the housing; the flow guiding assembly is correspondingly disposed between two adjacent battery cell modules, and the flow guiding assembly and the battery cell modules enclose to form a cooling channel, the cooling channel connecting the oil return groove and the oil outlet groove.

[0006] The first sidewall is provided with a first cavity and a second cavity arranged sequentially along a first direction. The second cavity is connected to the oil return groove. The first cavity is provided with a plurality of oil return holes arranged at intervals along a second direction. The oil return holes are connected to the first cavity and the second cavity, and along a third direction, the oil return holes are located above the oil return groove.

[0007] The second sidewall is provided with a third cavity and a fourth cavity arranged sequentially along the first direction. The third cavity is connected to the oil outlet groove, and the fourth cavity is provided with a number of oil outlet holes arranged at intervals along the second direction. The oil outlet holes are connected to the third cavity and the fourth cavity, and along the third direction, the oil outlet holes are located below the oil outlet groove.

[0008] The first side wall is provided with an oil outlet communicating with the first cavity, and the second side wall is provided with an oil inlet communicating with the fourth cavity. The oil inlet and the oil outlet are located at the same end of the housing. Along the third direction, the oil inlet is located above the oil outlet and the oil outlet is located above the oil return hole.

[0009] The flow guiding component includes a first flow guiding element and a second flow guiding element. Along the first direction, the first flow guiding element and the second flow guiding element are respectively disposed at opposite ends of the battery cell module. The first flow guiding element, the second flow guiding element and the battery cell module together form an S-shaped cooling channel.

[0010] The first flow guide includes a first extension arm and a second extension arm. The first extension arm is located at one end of the cell module near the first sidewall and extends along a third direction. The second extension arm extends from one end of the first extension arm along a first direction. The second flow guide includes a third extension arm and a fourth extension arm. The third extension arm is located at one end of the cell module near the second sidewall and extends in a direction opposite to the third direction. The fourth extension arm extends from one end of the third extension arm in a direction opposite to the first direction. Along the third direction, the fourth extension arm is located above the second extension arm. Along the first direction, there is a first gap between the fourth extension arm and the first extension arm, and a second gap between the second extension arm and the third extension arm.

[0011] Along the third direction, the top of the first extension arm is aligned with the top surface of the battery cell module, and the bottom of the third extension arm is aligned with the bottom surface of the battery cell module; along the third direction, there is a height difference between the bottom of the second extension arm and the bottom surface of the battery cell module, and there is also a height difference between the top of the fourth extension arm and the top surface of the battery cell module.

[0012] In particular, along the third direction, the distance between the oil return groove and the bottom of the tank is greater than or equal to 5mm.

[0013] Along the third direction, the height of the oil outlet groove is lower than the height of the top surface of the battery cell module.

[0014] This application also includes a second technical solution, providing a vehicle including the aforementioned battery pack.

[0015] The advantages of this application are as follows: Unlike the prior art, the battery pack provided in this application includes a housing, battery cell modules, and a flow guiding assembly; the housing includes a first sidewall and a second sidewall spaced apart along a first direction, the first sidewall having an oil return groove and the second sidewall having an oil outlet groove, both the oil return groove and the oil outlet groove extending along a second direction, and in a third direction, the height of the oil return groove is less than the height of the oil outlet groove. The first direction intersects the second direction, and the third direction is perpendicular to both the first and second directions; a plurality of battery cell modules are spaced apart within the housing along the second direction; the flow guiding assembly is correspondingly disposed between two adjacent battery cell modules, and the flow guiding assembly and the battery cell modules enclose and form a cooling channel, the cooling channel connecting the oil return groove and the oil outlet groove. This application forms a cooling circuit by integrating the two side walls of the housing with the cooling channels. This allows oil to enter the cooling channels from the oil outlet groove on the second side wall to cool the battery cell modules, and then flow out through the oil return groove on the first side wall. The cooling channels are formed by the flow guiding components located between adjacent battery cell modules and the battery cell modules themselves. This allows each battery cell module to have a corresponding cooling channel, thereby improving the consistency and temperature uniformity of the cooling effect of each battery cell module, and thus improving the cooling effect of the battery pack. Furthermore, since the oil return groove and the oil outlet groove are groove structures that extend along the second direction, when the battery cell modules are directly installed into the housing, the cooling channels between adjacent battery cell modules will directly connect with the grooves, eliminating the need for calibration steps, simplifying the assembly process, reducing assembly difficulty, and improving assembly speed and efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the battery pack of this application, wherein the battery pack includes a housing, a cell module, a current guiding component, and a sealing component;

[0018] Figure 2 yes Figure 1 A structural schematic diagram of the middle box from a first-person perspective;

[0019] Figure 3 yes Figure 1 A structural schematic diagram of the middle box from a second perspective;

[0020] Figure 4 yes Figure 1 A structural schematic diagram of the middle box from a third-person perspective;

[0021] Figure 5 yes Figure 1A structural schematic diagram of the middle box from a fourth-angle perspective;

[0022] Figure 6 yes Figure 1 A schematic diagram of the assembled structure of the middle casing, battery cell module, and current guiding component;

[0023] Figure 7 yes Figure 1 A top-view structural diagram of a cell module;

[0024] Figure 8 yes Figure 1 A schematic diagram of the structure of an embodiment of the central sealing element;

[0025] Figure 9 yes Figure 1 A schematic diagram of another embodiment of the central sealing element;

[0026] Figure 10 yes Figure 1 A schematic diagram of the assembled structure of the cell module and current guiding components.

[0027] Reference numerals: 1. Housing; 11. First side wall; 111. First cavity; 112. Second cavity; 113. Oil return groove; 114. Oil return hole; 115. Oil outlet; 12. Second side wall; 121. Oil outlet groove; 122. Oil outlet hole; 123. Third cavity; 124. Fourth cavity; 125. Oil inlet; 2. Battery cell module; 21. Battery cell; 3. Flow guiding assembly; 31. First flow guiding component; 311. First extension arm; 312. Second extension arm; 32. Second flow guiding component; 321. Third extension arm; 322. Fourth extension arm; 33. First gap; 34. Second gap; 4. Cooling channel; 41. First channel; 42. Second channel; 43. Third channel; 5. Sealing component; 6. Top cover; 7. Insulating sheet; 8. End plate; 100. Battery pack. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] Please refer to the reference. Figures 1 to 6 , Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack provided in this application. Figure 2 yes Figure 1 A first-person view structural diagram of the middle box. Figure 3 yes Figure 1 A structural schematic diagram of the middle box from a second perspective. Figure 4 yes Figure 1 A structural schematic diagram of the middle box from a third-person perspective. Figure 5 yes Figure 1 A structural schematic diagram of the middle box from a fourth-angle perspective. Figure 6 yes Figure 1A schematic diagram of the assembled structure of the casing, cell module, and current guiding assembly. In one aspect of this application, a battery pack 100 is provided, comprising a casing 1, cell module 2, and current guiding assembly 3. The casing 1 includes a first sidewall 11 and a second sidewall 12 arranged at intervals along a first direction D1. The first sidewall 11 is provided with an oil return groove 113, and the second sidewall 12 is provided with an oil outlet groove 121. Both the oil return groove 113 and the oil outlet groove 121 extend along a second direction D2, and in a third direction D3, the height of the oil return groove 113 is less than the height of the oil outlet groove 121. The first direction D1 intersects with the second direction D2, and the third direction D3 is perpendicular to both the first direction D1 and the second direction D2. Several battery cell modules 2 are arranged at intervals along the second direction D2 within the housing 1. A flow guiding component 3 is correspondingly positioned between two adjacent battery cell modules 2, and the flow guiding component 3 and the battery cell modules 2 enclose a cooling channel 4, which connects to the oil return groove 113 and the oil outlet groove 121. This application forms a cooling circuit by having the two side walls of the housing 1 and the cooling channel 4 together, allowing oil to enter the cooling channel 4 from the oil outlet groove 121 of the second side wall 12 to cool the battery cell modules 2, and then flow out through the oil return groove 113 of the first side wall 11, thus improving the cooling effect and temperature uniformity. Since the oil return groove 113 and the oil outlet groove 121 are groove structures, and the grooves extend along the second direction D2, when the battery cell module 2 is directly installed into the housing 1, the cooling channel 4 between adjacent battery cell modules 2 will be directly connected to the groove. Whether before or after assembly, the steps for calibration such as aligning oil holes or positioning are omitted, which reduces the assembly difficulty and improves the assembly speed and efficiency.

[0033] Specifically, such as Figures 1 to 5 As shown, the housing 1 can be a cuboid structure with an internal accommodating space that can accommodate the battery cell module 2 and the cooling channel 4 between the battery cell modules 2. The first direction D1 can be the width direction of the housing 1, the second direction D2 can be the length direction of the housing 1, and the third direction D3 can be the height direction of the housing 1. Therefore, in the cooling circuit of this application, the oil can enter the housing 1 from the second side wall 12 and then flow out through the first side wall 11, which can prevent the oil from accumulating in the housing 1 and improve temperature uniformity. Since the height of the oil outlet trough 121 is greater than the height of the oil return trough 113, the oil can flow from the top surface of the battery cell module 2 through the side of the battery cell module 2 in the second direction D2 to the bottom surface of the battery cell module 2, increasing the contact area between the oil and the battery cell module 2 and improving the cooling effect. The gap between two adjacent battery cell modules 2 has the same width, and the cooling channel 4 is located within the gap, formed by the side of the battery cell module 2 and the guide assembly 3. In a specific embodiment, as Figure 6As shown, the cooling channel 4 can be an S-shaped channel. The top of the S-shaped channel is connected to the oil outlet groove 121, and the bottom is connected to the oil return groove 113. That is, the flow direction of the oil can be from the oil outlet groove 121 to the top of the cell module 2, first from the second side wall 12 to the first side wall 11, then down to the middle of the cell module 2, then from the first side wall 11 to the second side wall 12, then down to the bottom of the cell module 2, and finally from the second side wall 12 to the first side wall 11, flowing out through the oil return groove 113. Through such a cooling circuit, the sides of the cell module 2 can be sufficiently cooled, improving or avoiding the problem of uneven cooling and improving temperature uniformity. Of course, in another specific embodiment, while meeting the requirement of uniform cooling of the cell module 2, the cooling channel 4 formed by the flow guiding component 3 and the side of the cell module 2 can also be of other shapes.

[0034] The lengths of the oil outlet groove 121 and the oil return groove 113 in the second direction D2 can be greater than the arrangement length of the battery cell module 2. In other words, the oil outlet groove 121 and the oil return groove 113 can both cover the battery cell module 2 in the second direction D2, which can reduce or avoid the influence of the tolerances of the battery cell module 2, the assembly tolerances, etc., so that the oil can flow into the cooling channel 4 evenly when the battery cell module 2 is assembled into the housing 1, thereby improving the temperature uniformity.

[0035] Combination Figures 4 to 6 As shown, in one embodiment of this application, the first sidewall 11 is provided with a first cavity 111 and a second cavity 112 arranged sequentially along a first direction D1. The second cavity 112 is connected to the oil return groove 113. The first cavity 111 is provided with a plurality of oil return holes 114 arranged at intervals along a second direction D2. The oil return holes 114 are connected to the first cavity 111 and the second cavity 112, and along a third direction D3, the oil return holes 114 are located above the oil return groove 113.

[0036] Specifically, both the first cavity 111 and the second cavity 112 extend along the second direction D2. The design of the oil return groove 113 can improve the efficiency of oil absorption, allowing the oil to flow evenly into the first cavity 111 from multiple oil return holes 114 after accumulating to a certain height, thus improving the uniformity of flow. The first cavity 111 can be connected to the outside to discharge the oil.

[0037] In one embodiment of this application, the second sidewall 12 is provided with a third cavity 123 and a fourth cavity 124 arranged sequentially along the first direction D1. The third cavity 123 is connected to the oil outlet groove 121. The fourth cavity 124 is provided with a plurality of oil outlet holes 122 arranged at intervals along the second direction D2. The oil outlet holes 122 are connected to the third cavity 123 and the fourth cavity 124, and along the third direction D3, the oil outlet holes 122 are located below the oil outlet groove 121.

[0038] Specifically, both the third cavity 123 and the fourth cavity 124 extend along the second direction D2. The design of the oil outlet 121 allows the oil to flow evenly into the cooling channel 4. Specifically, after the oil enters the fourth cavity 124, it can be diverted through the oil outlet 122 of the fourth cavity 124 and enter the third cavity 123, making the flow rate uniform at various positions in the third cavity 123 along the second direction D2. After the oil accumulates, it is sprayed out through the oil outlet 121. Since the width of the cooling channel 4 is uniform, the resistance to the oil entering the cooling channel 4 is uniform, and the flow rate is uniform, thereby achieving uniform cooling of the battery cell module 2 and improving temperature uniformity.

[0039] In one embodiment of this application, as Figure 4 and Figure 5 As shown, the first sidewall 11 is provided with an oil outlet 115 communicating with the first cavity 111, and the second sidewall 12 is provided with an oil inlet 125 communicating with the fourth cavity 124. The oil inlet 125 and the oil outlet 115 are located at the same end of the housing 1. Along the third direction D3, the oil inlet 125 is located above the oil outlet 122, which can increase the resistance near the oil inlet 125 in the first cavity 111 and improve the uniformity of oil distribution in the oil outlet 122. The oil outlet 115 is located above the return oil hole 114, which can make the oil discharged evenly.

[0040] Specifically, the oil outlet 115 is used to discharge oil, and the oil inlet 125 is used to introduce oil. Oil can enter the fourth chamber 124 through the oil inlet 125, then be diverted through the oil outlet 122 and accumulate in the third chamber 123. When it reaches a certain height, it is sprayed out from the oil outlet 121 and enters the corresponding cooling channel 4. Then, it accumulates in the second chamber 112 through the oil return trough 113, and then converges into the first chamber 111 through the oil return hole 114, finally being discharged through the oil outlet 115. It should be noted that, as... Figure 5 As shown, in order to improve the uniformity of the flow distribution of the oil outlet 122, the size of the oil outlet 122 can be minimized near the oil inlet 125 and maximized away from the oil inlet 125, with the size increasing sequentially in between. This makes the resistance of the oil outlet 122 to the oil decrease as it moves away from the oil inlet 125. A portion of the oil in the fourth cavity 124 passes through the oil outlet 122 near the oil inlet 125. Due to the high resistance, the remaining portion can continue to flow along the fourth cavity 124, thereby making the oil flow uniformly through the oil outlet 122 at each position, so that the oil flow rate at each position in the third cavity 123 is the same.

[0041] In one specific embodiment, the first cavity 111 includes an upper cavity, a middle cavity, and a lower cavity. In the third direction D3, the upper cavity is spaced above the lower cavity and connected to it via the middle cavity, which is away from the oil outlet 115. After passing through the return hole 114, the oil can collect in the lower cavity along the second direction D2, finally entering the upper cavity through the middle cavity, and then exiting from the oil outlet 115 along the upper cavity. By merging the oil in the lower and middle cavities, the travel distance of the oil flowing out of the tank 1 can be extended, making it approximately similar to the travel distance of the oil flowing into the tank 1 through the oil inlet 125. Since the oil travel distance is the same at all locations within the first cavity 111, the outflow resistance is the same, thus allowing the oil to flow out uniformly, thereby achieving flow uniformity and improving heat dissipation performance.

[0042] In one embodiment of this application, as Figure 6 As shown, the flow guiding component 3 includes a first flow guiding component 31 and a second flow guiding component 32. Along the first direction D1, the first flow guiding component 31 and the second flow guiding component 32 are respectively disposed at opposite ends of the battery cell module 2. The first flow guiding component 31, the second flow guiding component 32 and the battery cell module 2 enclose an S-shaped cooling channel 4.

[0043] Combined with reference Figure 7 , Figure 7 yes Figure 1 A top-view structural diagram of the battery cell module. Specifically, the bottom of the battery cell module 2 can be fixed to the housing 1 by applying adhesive. Each battery cell module 2 can also include several battery cells 21 in the first direction D1. Adjacent battery cells 21 are connected by a sealing member 5, and the sealing member 5 can seal the gap between the two battery cells 21. That is to say, the cooling channel 4 is in a sealed state in the second direction D2, and the oil can only flow in the cooling channel 4 in the first direction D1 or the third direction D3. The second guide member 32 can form a first channel 41 with the top side of the battery cell module 2. The first guide member 31 and the second guide member 32 can form a second channel 42 with the middle side of the battery cell module 2. The first guide member 31 can also form a third channel 43 with the bottom side of the battery cell module 2. On the third direction D3, the first channel 41, the second channel 42 and the third channel 43 are arranged sequentially, and the first channel 41 connects to the oil outlet 121 and the second channel 42, and the third channel 43 connects to the oil return 113 and the second channel 42. The first channel 41, the second channel 42 and the third channel 43 form an S-shaped cooling channel 4. The S-shaped cooling flow can increase the contact area between the oil and the side of the battery cell module 2, and improve the cooling effect and temperature uniformity. In a specific embodiment, as shown... Figure 7 and Figure 8 As shown, Figure 8 yes Figure 1A schematic diagram of one embodiment of the sealing element shows that the top and bottom of the battery cell 21 have rounded corners. The sealing element 5 can adopt an I-type rubber strip design to reduce or avoid leakage at the rounded corners of the battery cell 21, allowing the oil to flow according to the theoretically planned cooling channel 4 and improving temperature uniformity. In another specific embodiment, such as... Figure 7 and Figure 9 As shown, Figure 9 yes Figure 1 A schematic diagram of another embodiment of the sealing element is shown. The sealing element 5 can be set on the side of the battery cell module 2. One side of the I-shaped rubber strip fits with the rounded corner of the battery cell to play a sealing role, and the other side can abut against the side wall of the housing 1 to play a buffering and protective role.

[0044] Furthermore, please combine Figure 10 , Figure 10 yes Figure 1 A schematic diagram of the assembled battery cell module and flow guiding components. The first flow guiding component 31 includes a first extension arm 311 and a second extension arm 312. The first extension arm 311 is located at the end of the battery cell module 2 near the first sidewall 11 and extends along a third direction D3. The second extension arm 312 extends from one end of the first extension arm 311 along a first direction D1. The second flow guiding component 32 includes a third extension arm 321 and a fourth extension arm 322. The third extension arm 321 is located at the end of the battery cell module 2 near the second sidewall 12 and extends in a direction opposite to the third direction D3. The fourth extension arm 322 extends from one end of the third extension arm 321 in a direction opposite to the first direction D1. In a specific embodiment, both the first flow guiding component 31 and the second flow guiding component 32 can be L-shaped rubber structures or foam structures. The two L-shaped rubber structures are located at opposite ends of the battery cell module 2, with their L-shaped openings corresponding to each other, thereby forming an S-shaped cooling channel 4. Of course, in another specific embodiment, the first guide member 31 and the second guide member 32 may also be made of other shapes or materials, which will not be described in detail here.

[0045] Along the third direction D3, the fourth extension arm 322 is located above the second extension arm 312. Along the first direction D1, there is a first gap 33 between the fourth extension arm 322 and the first extension arm 311, and a second gap 34 between the second extension arm 312 and the third extension arm 321. Through this structure, the fourth extension arm 322 can form a first channel 41 with the side of the cell module 2, the second extension arm 312 and the fourth extension arm 322 can form a second channel 42 with the side of the cell module 2, and the second extension arm 312 can form a third channel 43 with the side of the cell module 2. The first channel 41 communicates with the second channel 42 through the first gap 33, and the second channel 42 communicates with the third channel 43 through the second gap 34, thereby forming an S-shaped cooling channel 4.

[0046] Furthermore, along the third direction D3, the top of the first extension arm 311 is aligned with the top surface of the cell module 2, and the bottom of the third extension arm 321 is aligned with the bottom surface of the cell module 2. Along the third direction D3, there is a height difference between the bottom of the second extension arm 312 and the bottom surface of the cell module 2, and there is also a height difference between the top of the fourth extension arm 322 and the top surface of the cell module 2.

[0047] With the above structure, the first extension arm 311 and the fourth extension arm 322 together form a first channel 41 with the side of the cell module 2. The first extension arm 311 together with the second extension arm 312, the third extension arm 321 and the fourth extension arm 322 together form a second channel 42 with the side of the cell module 2. The second extension arm 312 together with the third extension arm 321 together form a third channel 43 with the side of the cell module 2 and the bottom of the housing 1, thereby improving the sealing performance of the cooling channel 4 and improving or avoiding the problem of local oil leakage.

[0048] In one specific embodiment, the height of the second extension arm 312 from the bottom of the cell module 2 and the distance of the fourth extension arm 322 from the top cover of the cell module 2 can be controlled within 50mm, such as 50mm, 48mm, 46mm, 44mm, 42mm, 40mm, etc., to form a first channel 41 and a third channel 43 with a height of less than 50mm. The first guide member 31 and the second guide member 32 can be the same size and symmetrically arranged. Of course, in another specific embodiment, the size and dimensions of the first guide member 31 and the second guide member 32 can be adjusted, as long as there is space to form an S-shaped cooling channel 4.

[0049] In one embodiment of this application, along the third direction D3, the distance between the oil return groove 113 and the bottom of the housing 1 is greater than or equal to 5mm, such as 5mm, 6mm, 7mm, 8mm, etc., which can improve or prevent the structural adhesive at the bottom of the housing 1 from overflowing and blocking the oil return groove 113.

[0050] In one embodiment of this application, along the third direction D3, the height of the oil outlet groove 121 is lower than the height of the top surface of the cell module 2, which can improve or prevent a large amount of oil from flowing out of the space above the cell module 2. After passing through the oil outlet groove 121, most of the oil can directly enter the cooling channel 4, and a smaller portion can first flow over the top surface of the cell module 2 and then enter the cooling channel 4.

[0051] In one embodiment of this application, as Figure 1 As shown, the battery pack 100 also includes a top cover 6, an insulating sheet 7, and an end plate 8. The top cover 6 is used to cover the housing 1, and the insulating sheet 7 and the end plate 8 are arranged on both sides of the cell module 2 along the second direction D2 to provide insulation and protection.

[0052] Specifically, since the oil flows through the housing 1 and the cooling channel 4, the top cover 6 does not need to participate in the cooling process of the cell module 2, which simplifies the structural design of the top cover 6 and allows the height dimension of the battery pack 100 to be further reduced, thereby increasing the height space of the rear passenger compartment and improving comfort.

[0053] In another aspect, this application also provides a vehicle that includes the battery pack 100 described above. Specifically, since the vehicle includes the battery pack 100 described in the above embodiments, it also has the beneficial effects of the battery pack 100 described above, which will not be repeated here.

[0054] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted. In addition, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships that are commonly used when the product of this application is in use. They are only for the purpose of describing the embodiments of 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. Therefore, they should not be construed as limitations on this application.

[0055] It is understood that the term "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0056] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The housing (1) includes a first sidewall (11) and a second sidewall (12) arranged at intervals along a first direction. The first sidewall (11) is provided with an oil return groove (113), and the second sidewall (12) is provided with an oil outlet groove (121). Both the oil return groove (113) and the oil outlet groove (121) extend along a second direction, and in a third direction, the height of the oil return groove (113) is less than the height of the oil outlet groove (121). The first direction intersects the second direction, and the third direction is perpendicular to both the first direction and the second direction. A battery cell module (2), a plurality of said battery cell modules (2) are arranged at intervals along the second direction in the housing (1); A flow guiding component (3) is disposed between two adjacent battery cell modules (2), and the flow guiding component (3) and the battery cell module (2) enclose a cooling channel (4), which connects the oil return groove (113) and the oil outlet groove (121).

2. The battery pack according to claim 1, characterized in that, The first sidewall (11) is provided with a first cavity (111) and a second cavity (112) arranged sequentially along the first direction. The second cavity (112) is connected to the oil return groove (113). The first cavity (111) is provided with a plurality of oil return holes (114) arranged at intervals along the second direction. The oil return holes (114) connect the first cavity (111) and the second cavity (112), and along the third direction, the oil return holes (114) are located above the oil return groove (113).

3. The battery pack according to claim 2, characterized in that, The second sidewall (12) is provided with a third cavity (123) and a fourth cavity (124) arranged sequentially along the first direction. The third cavity (123) is connected to the oil outlet groove (121). The fourth cavity (124) is provided with a plurality of oil outlet holes (122) arranged at intervals along the second direction. The oil outlet holes (122) are connected to the third cavity (123) and the fourth cavity (124). Along the third direction, the oil outlet holes (122) are located below the oil outlet groove (121).

4. The battery pack according to claim 3, characterized in that, The first sidewall (11) is provided with an oil outlet (115) communicating with the first cavity (111), and the second sidewall (12) is provided with an oil inlet (125) communicating with the fourth cavity (124). The oil inlet (125) and the oil outlet (115) are located at the same end of the box (1). Along the third direction, the oil inlet (125) is located above the oil outlet (122), and the oil outlet (115) is located above the oil return hole (114).

5. The battery pack according to claim 2 or 3, characterized in that, The flow guiding component (3) includes a first flow guiding element (31) and a second flow guiding element (32). Along the first direction, the first flow guiding element (31) and the second flow guiding element (32) are respectively disposed at opposite ends of the battery cell module (2). The first flow guiding element (31), the second flow guiding element (32) and the battery cell module (2) enclose and form an S-shaped cooling channel (4).

6. The battery pack according to claim 5, characterized in that, The first flow guide (31) includes a first extension arm (311) and a second extension arm (312). The first extension arm (311) is located at one end of the cell module (2) near the first sidewall (11) and extends along the third direction. The second extension arm (312) extends from the first extension arm (311) along the first direction. The second flow guide (32) includes a third extension arm (321) and a fourth extension arm (322). The third extension arm (321) is located at one end of the cell module (2) near the second sidewall (12) and extends in a direction opposite to the third direction. The fourth extension arm (322) extends from one end of the third extension arm (321) in a direction opposite to the first direction. Along the third direction, the fourth extension arm (322) is located above the second extension arm (312); Along the first direction, there is a first gap (33) between the fourth extension arm (322) and the first extension arm (311), and a second gap (34) between the second extension arm (312) and the third extension arm (321).

7. The battery pack according to claim 6, characterized in that, Along the third direction, the top of the first extension arm (311) is aligned with the top surface of the cell module (2), and the bottom of the third extension arm (321) is aligned with the bottom surface of the cell module (2). Along the third direction, there is a height difference between the bottom of the second extension arm (312) and the bottom surface of the cell module (2), and there is also a height difference between the top of the fourth extension arm (322) and the top surface of the cell module (2).

8. The battery pack according to claim 1, characterized in that, Along the third direction, the distance between the oil return groove (113) and the bottom of the box (1) is greater than or equal to 5 mm.

9. The battery pack according to claim 1, characterized in that, Along the third direction, the height of the oil outlet groove (121) is lower than the height of the top surface of the battery cell module (2).

10. A vehicle, characterized in that, include: The battery pack according to any one of claims 1-9.

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