Lower box body and battery pack

Abstract

The utility model provides a lower box body and a battery pack. The lower box body comprises a bottom plate; the cold plate is provided with a stamping part and a peripheral connecting part, the stamping part is concavely arranged in the direction away from the bottom plate, and a heat exchange runner is defined by the stamping part and the bottom plate; the peripheral connecting part surrounds the stamping part and is connected with the bottom plate in a welded mode. The first port and the second port are fixedly connected with the bottom plate, one of the first port and the second port is communicated with the inlet end of the heat exchange runner, and the other one of the first port and the second port is communicated with the outlet end of the heat exchange runner; the stamping part is arranged on the cold plate, and the stamping part and the bottom plate are encircled to form the heat exchange runner, so that the effective proportion of the heat exchange runner can be increased, and the cooling effect on the battery pack is enhanced; the peripheral connecting part of the cold plate is arranged around the stamping part, so that the connecting difficulty of the cold plate can be reduced, and the product quality and the production efficiency of the battery pack can be improved.

Description

Technical Field

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

[0002] Liquid cooling systems are a crucial component of battery packs, used to dissipate heat generated by the battery pack and ensure its overall performance and operating environment. To ensure effective connection between the cooling plate in the liquid cooling system and the lower casing of the battery pack, connection points are typically placed within the cooling area of ​​the cooling plate. However, this not only reduces the effective proportion of the cooling area and lowers the cooling performance of the cooling plate, but also increases the welding difficulty between the cooling plate and the casing, affecting the overall quality and production efficiency of the battery pack. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a lower casing and battery pack to solve some or all of the aforementioned technical problems.

[0004] For the purposes described above, a first aspect of this application provides a lower housing, comprising:

[0005] Base plate;

[0006] A cold plate, comprising a stamped portion and an outer connecting portion, wherein the stamped portion is recessed in a direction away from the base plate and surrounds the base plate to form a heat exchange channel; the outer connecting portion surrounds the stamped portion and is welded to the base plate; and

[0007] The first port and the second port are both fixedly connected to the base plate, and one of them is connected to the inlet end of the heat exchange channel, while the other is connected to the outlet end of the heat exchange channel.

[0008] Based on the same inventive concept, a second aspect of this application also provides a battery pack, comprising:

[0009] As described in the first aspect, the lower housing has a receiving cavity on the side of the lower housing away from the cold plate; and

[0010] Multiple battery modules are located within the receiving cavity; the multiple battery modules are correspondingly arranged with respect to the heat exchange channels.

[0011] As can be seen from the above, the lower housing and battery pack provided in this application, by setting a stamped part on the cold plate and making the stamped part of the cold plate and the bottom plate of the lower housing surround to form a heat exchange channel, can increase the effective proportion of the heat exchange channel, thereby improving the cooling effect on the battery pack; at the same time, by setting the outer connecting part around the stamped part, the sealing effect of the heat exchange channel after welding and the reliability of the connection can be ensured, the connection difficulty of the cold plate can be reduced, and the welding process can be prevented from damaging the heat exchange channel, thereby improving the overall quality and production efficiency of the battery pack. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the lower housing in an embodiment of this application;

[0014] Figure 2 This is an exploded view of the lower housing in an embodiment of this application;

[0015] Figure 3 This is a bottom view of the lower housing in an embodiment of this application;

[0016] Figure 4 This is a partial sectional view of the lower housing in an embodiment of this application;

[0017] Figure 5 This is a schematic diagram of the overall cold plate in an embodiment of this application;

[0018] Figure 6 This is an exploded view of the cold plate in an embodiment of this application;

[0019] Figure 7 This is a partial enlarged view of the cold plate in an embodiment of this application;

[0020] Figure 8 This is a schematic diagram of the first type of heat exchange channel in the embodiments of this application;

[0021] Figure 9 This is a schematic diagram of the second type of heat exchange channel in the embodiments of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Base plate; 101. Rib;

[0024] 2. Cold plate; 201. Stamping section; 202. Peripheral connection section; 203. Heat exchange channel; 2031. Channel section; 2031a. Branch channel section; 2031b. Merging channel section; 204. Guide ridge; 210. First plate layer; 220. Second plate layer; 230. Third plate layer;

[0025] 3. First port;

[0026] 4. Second port. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] The cold plate is a key component of the battery pack cooling system, and its connection with the lower casing directly affects the battery pack's heat dissipation performance and product quality. In practical applications, to ensure the sealing performance and reliability of the connection between the cold plate and the lower casing, multiple connection points are usually set within the cooling area of ​​the cold plate to increase the connection surface between the cold plate and the base plate. Taking the installation of the cold plate in the lower casing of the battery pack as an example, the cold plate and the base plate can be connected by welding. However, the distribution of connection points on the surface of the cold plate is relatively scattered, making continuous welding and automated welding operations difficult. Only spot welding processes such as brazing can be used for welding, which not only increases the complexity of the cold plate installation process but may also lead to a decrease in battery pack production efficiency.

[0031] Furthermore, since some connection points are located within the cooling area, the presence of these connection points reduces the effective proportion of the cooling area within the cold plate. This leads to a decrease in the cooling effect of the cold plate on the battery pack, hindering long-term high-load operation of the battery and thus affecting the product quality of the battery pack.

[0032] The first aspect of this application provides a lower housing for a battery pack, combined with Figures 1-9 The exhibit provides a detailed description of the lower housing.

[0033] A lower housing includes a base plate 1, a cold plate 2, a first port 3, and a second port 4. The cold plate 2 is provided with a stamped part 201 and an outer connecting part 202. The stamped part 201 is recessed in the direction away from the base plate 1 and forms a heat exchange channel 203 with the base plate 1. The outer connecting part 202 surrounds the stamped part 201 and is welded to the base plate 1. The first port 3 and the second port 4 are both fixedly connected to the base plate 1, and one of them is connected to the inlet end of the heat exchange channel 203, and the other is connected to the outlet end of the heat exchange channel 203.

[0034] Specifically, Figure 1 This is an overall schematic diagram of the lower housing in an embodiment of this application. Figure 2 This is an exploded view of the lower box in an embodiment of this application. Figure 4 This is a partial cross-sectional view of the lower housing in an embodiment of this application.

[0035] Specifically, such as Figure 1 , Figure 3 as well as Figure 4 As shown, one side of the base plate 1 can be connected to the surrounding side beam structure. The connection between the side beam structure and the base plate 1 can form a receiving cavity, which can provide installation space for the battery module of the battery pack and protect it. The other side of the base plate 1 is connected to the cold plate 2 structure to isolate the receiving cavity from the cold plate 2, so as to prevent the heat exchange medium from entering the receiving cavity and affecting the stability of the working environment of the battery module, and to ensure the cooling effect of the heat exchange medium on the battery module.

[0036] For example, the base plate 1 may be formed of an alloy material with high strength and good thermal conductivity, such as aluminum alloy.

[0037] Specifically, Figure 3 This is a bottom view of the lower housing in an embodiment of this application; as shown Figure 3 and Figure 4As shown, the cold plate 2 is connected to the bottom plate 1 of the lower housing, and the stamped part 201 of the cold plate 2 is recessed in the direction away from the bottom plate 1. This can form a cavity structure between the bottom plate 1 and the cold plate 2. When the bottom plate 1 and the cold plate 2 are sealed together, the cavity structure can be used as a heat exchange channel 203. When there is a heat exchange medium in the heat exchange channel 203, the heat generated by the battery module inside the lower housing during operation can be transferred to the heat exchange medium through the bottom plate 1. As the heat exchange medium flows continuously, the battery pack can release the heat generated by the battery pack to the external environment through the heat exchange medium, thereby achieving the purpose of heat dissipation.

[0038] More specifically, Figure 5 This is a schematic diagram of the overall structure of the cold plate 2 in an embodiment of this application; as shown Figures 3-5 As shown, for the cold plate 2, the outer connecting part 202 is disposed on the edge of the cold plate 2 and arranged around the stamping part 201. In this way, when the cold plate 2 is welded to the surface of the lower housing bottom plate 1, the cold plate 2 can be welded at the outer connecting part 202 to reduce the welding difficulty. Since the outer connecting part 202 is arranged around the stamping part 201, the welded area formed after welding will surround the heat exchange channel 203 of the cold plate 2, thereby effectively sealing the heat exchange channel 203. At the same time, the outer connecting part 202 is arranged around the surface of the stamping part 201, which can effectively reduce the encroachment of the welded area formed by the cold plate 2 on its cooling area, which can further expand the cooling area of ​​the effective cooling area of ​​the cold plate 2, improve the cooling effect of the cold plate 2, and enhance the heat dissipation performance of the battery pack.

[0039] For example, the outer connecting portion 202 of the base plate 1 and the cold plate 2 can be connected by friction stir welding. Specifically, firstly, friction stir welding (FSW) is a solid-state welding technology that uses a rotating welding tool to generate frictional heat at the joint, softening and bonding the materials in the welding area to achieve the welding purpose. More specifically, when welding the outer connecting portion 202 of the base plate 1 and the cold plate 2 using friction stir welding, the base plate 1 and the outer connecting portion 202 will not melt during the welding process, avoiding defects such as porosity and cracks in the welded area after welding, making its overall strength and performance closer to the base material. Secondly, the process of welding the cold plate 2 using friction stir welding does not require solder or shielding gas, resulting in low energy consumption and no harmful gas emissions. Due to the low heat input and small workpiece deformation, precision welding between the lower housing and the cold plate 2 can be achieved. In addition, the friction stir welding process is easy to automate, which can significantly improve welding efficiency.

[0040] For example, the outer connecting portion 202 of the base plate 1 and the cold plate 2 can be connected by laser welding. Specifically, laser welding is a welding technology that uses a high-energy-density laser beam as a heat source. By focusing the laser beam onto the surface of the workpiece, the material is rapidly melted and forms a molten pool, which is then cooled to achieve the connection. When laser welding is used to weld the cold plate 2 and the base plate 1, no solder is required and the energy consumption is low, and no harmful gases are emitted. Due to the high energy of the laser, the welding speed of the cold plate 2 is fast, and the resulting weld has relatively high precision and fineness, which is beneficial for achieving fine welding. In addition, laser welding is easily applied to robotic welding processes, which is conducive to achieving efficient and automated production of battery packs.

[0041] Specifically, such as Figures 1-3 As shown, the lower housing may further include at least one first port 3 and at least one second port 4, wherein both the first port 3 and the second port 4 are fixedly connected to the base plate 1, and the base plate 1 can provide installation positions for the first port 3 and the second port 4. For example, for the lower housing, the first port 3 can be connected to the inlet end of the heat exchange channel 203, and the second port 4 can be connected to the outlet end of the heat exchange channel 203. When cooling the battery pack using the heat exchange medium in the heat exchange channel 203, the heat exchange medium can be transported into the heat exchange channel 203 through the first port 3. At this time, the battery pack can transfer the heat it generates to the heat exchange medium in the heat exchange channel 203 through the base plate 1 of the lower housing. Since the heat exchange medium flows within the heat exchange channel 203, the heat-carrying heat medium can flow out through the second port 4 to release the heat to the external environment, thereby achieving heat dissipation for the battery pack.

[0042] In some embodiments, the cold plate 2 includes a first plate layer 210, a second plate layer 220 and a third plate layer 230 stacked sequentially, the first plate layer 210 being fixedly connected to the base plate 1; the first plate layer 210 and the third plate layer 230 are formed of ternary aluminum, and the second plate layer 220 is formed of hexagonal aluminum.

[0043] Specifically, tri-series aluminum is an aluminum alloy material with manganese as the main alloying element. It has good plasticity and corrosion resistance and is suitable for applications with high requirements for corrosion resistance and formability. Hex-series aluminum is an aluminum alloy material with magnesium and silicon as the main alloying elements. It has high strength and can be strengthened by heat treatment and is suitable for applications with high strength requirements.

[0044] Specifically, the stamped portion 201 on the cold plate 2 is recessed in a direction away from the base plate 1. This allows a uniform heat exchange channel 203 to be formed between the stamped portion 201 and the base plate 1 when the cold plate 2 is fixedly connected, enabling the internal heat exchange medium to absorb the heat released from the lower casing. The cold plate 2 can be a single-layer plate structure made of six-series aluminum, reducing its structural complexity. More specifically, due to the high strength of six-series aluminum, a recessed structure needs to be machined inside the cold plate 2 through an extrusion process. This not only simplifies the manufacturing process and shortens the manufacturing cycle of the cold plate 2, but also ensures that a relatively stable heat exchange channel 203 can be formed between the cold plate 2 and the base plate 1 during welding, improving the overall performance of the cold plate 2.

[0045] More specifically, Figure 6 This is an exploded view of the cold plate 2 in an embodiment of this application. Figure 7 This is a partial enlarged view of the cold plate 2 in an embodiment of this application; as shown Figures 5-7 As shown, the cold plate 2 may further include a first plate layer 210, a second plate layer 220, and a third plate layer 230, which are stacked sequentially to form a multi-layer structure. The first plate layer 210 is fixedly connected to the base plate 1, and the first plate layer 210 and the third plate layer 230 are made of ternary aluminum, while the second plate layer 220 is made of hexagonal aluminum. Since the cold plate 2 and the base plate 1 enclose a heat exchange channel 203, when there is a heat exchange medium in the heat exchange channel 203, the use of the first plate layer 210 made of ternary aluminum can enhance the corrosion resistance of the cold plate 2 and extend its service life. Similarly, the use of the third plate layer 230 made of ternary aluminum to cover the outermost part of the cold plate 2 structure can give the battery pack with the cold plate 2 stronger corrosion resistance, so that it can be used in more complex and harsher application scenarios.

[0046] Furthermore, the cold-rolled sheet 2 provided in this application adopts a layered structure of a first layer 210, a second layer 220, and a third layer 230 stacked sequentially, with the material distribution being tri-series aluminum, hexagonal aluminum, and tri-series aluminum. Compared to a cold-rolled sheet 2 formed by a single layer of hexagonal aluminum, this layered design fully utilizes the good plasticity and corrosion resistance of tri-series aluminum while combining the high mechanical strength of hexagonal aluminum. This allows the cold-rolled sheet 2 to have good strength while its thickness can be appropriately reduced, lowering the forming difficulty and facilitating lightweight design. In addition, since the overall hardness of the cold-rolled sheet 2 using a layered structure is reduced, it can be processed using a lower-cost and higher-yield stamping process, thereby improving the overall quality of the cold-rolled sheet 2 and reducing product costs.

[0047] In some embodiments, the thicknesses of the first layer 210 and the third layer 230 are both less than the thickness of the second layer 220.

[0048] Specifically, such as Figure 7 As shown, since the cold plate 2 is composed of a first plate layer 210, a second plate layer 220 and a third plate layer 230, wherein the first plate layer 210 and the third plate layer 230 are made of ternary aluminum and the second plate layer 220 is made of hexagonal aluminum, by setting the thickness of the first plate layer 210 and the third plate layer 230 to be less than the thickness of the second plate layer 220, the overall strength of the cold plate 2 can be ensured while reducing its forming difficulty, making it easier to form by stamping process, so that the cold plate 2 has both good strength and excellent forming efficiency.

[0049] In some embodiments, the thickness of the cold-rolled sheet 2 ranges from 0.8 to 1.5 mm. Setting the thickness of the cold-rolled sheet 2 above 0.8 mm ensures good strength and improves its resistance to unexpected forces. Conversely, controlling the thickness of the cold-rolled sheet 2 below 1.5 mm allows for the fabrication of the required stamped portion 201 through a stamping process, reducing the forming difficulty and manufacturing cost. Therefore, this thickness range balances the feasibility and economy of the cold-rolled sheet 2.

[0050] In some embodiments, the heat exchange channel 203 includes a plurality of channel segments 2031, which extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction. The plurality of channel segments 2031 are connected sequentially, the channel segment 2031 at the beginning of the heat exchange channel 203 is connected to the first port 3, the channel segment 2031 at the end of the heat exchange channel 203 is connected to the second port 4, and the heat exchange medium in adjacent channel segments 2031 flows in opposite directions.

[0051] Specifically, the heat exchange medium can flow within the heat exchange channel 203 to cool the battery pack; wherein, Figure 8 This is a schematic diagram of the heat exchange channel 203 of the first type in the embodiments of this application; as shown Figure 2 , Figure 3 , Figure 5 , Figure 6 as well as Figure 8 To ensure the cooling efficiency of the cold plate 2, the heat exchange channel 203 may include multiple channel segments 2031. The multiple channel segments 2031 may extend in a first direction and be evenly arranged in a second direction perpendicular to the first direction. This can increase the utilization rate of the heat exchange channel 203 on the cold plate 2, improve the uniformity of the distribution of the channel segments 2031 on the cold plate 2, and give the cold plate 2 a larger effective cooling area and better cooling performance.

[0052] Furthermore, such as Figure 8As shown, since multiple flow channel segments 2031 are arranged in parallel in the second direction, when the beginning and end of the multiple flow channel segments 2031 are connected in sequence, the heat exchange channel 203 composed of multiple flow channel segments 2031 can be arranged in a serpentine manner in the second direction, and the heat exchange medium flows in opposite directions in adjacent flow channel segments 2031. This allows the multiple flow channel segments 2031 to be arranged compactly in the cooling area of ​​the cold plate 2, so as to increase the cooling area of ​​the cold plate 2 and improve its cooling efficiency. At the same time, this design is also conducive to the concentrated distribution of the lower box of the first port 3 and the second port 4, reducing the complexity of the subsequent external pipeline layout.

[0053] For example, since the heat dissipation capacity of the battery pack gradually decreases from the edge to the center region, therefore... Figure 8 As shown, when multiple flow channel segments 2031 are connected in sequence, the first port 3 can be used as the inlet end and the second port 4 as the outlet end. The flow channel segment 2031 at the beginning of the heat exchange flow channel 203 at the first port 3 is connected, and the flow channel segment 2031 at the end of the heat exchange flow channel 203 at the second port 4 is connected to the second port 4. In this way, after the heat exchange medium flows into the heat exchange flow channel 203, it can preferentially flow through the central region of the heat exchange medium to enhance the cooling efficiency of the heat exchange medium on the battery pack.

[0054] In some embodiments, the heat exchange channel 203 includes a plurality of channel segments 2031, which extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; some of the channel segments 2031 are branch channel segments 2031a and some are confluence channel segments 2031b; the branch channel segments 2031a and the confluence channel segments 2031b are connected, and one of them is connected to the first port 3 and the other is connected to the second port 4, and the heat exchange medium flows in opposite directions in the branch channel segments 2031a and the confluence channel segments 2031b.

[0055] The heat exchange medium can flow within the heat exchange channel 203 to cool the battery pack; wherein, Figure 9 This is a schematic diagram of the second type of heat exchange channel 203 in the embodiments of this application; as shown Figure 2 , Figure 3 , Figure 5 , Figure 6 as well as Figure 9 To ensure the cooling efficiency of the cold plate 2, the heat exchange channel 203 may include multiple channel segments 2031. The multiple channel segments 2031 may extend in a first direction and be evenly arranged in a second direction perpendicular to the first direction. This can increase the utilization rate of the heat exchange channel 203 on the cold plate 2, improve the uniformity of the distribution of the channel segments 2031 on the cold plate 2, give the cold plate 2 a larger effective cooling area, and provide better cooling performance.

[0056] Furthermore, such as Figure 9 As shown, for the flow channel segment 2031 of the heat exchange channel 203, some of the multiple flow channel segments 2031 can be designated as branch flow channel segments 2031a, and some as confluence flow channel segments 2031b. By connecting the branch flow channel segments 2031a and the confluence flow channel segments 2031b, and connecting one of them to the first port 3 and the other to the second port 4, when the heat exchange medium flows into the branch flow channel segment 2031a at the same time, the heat exchange medium can be evenly distributed in the multiple branch flow channel segments 2031a, which can further improve the uniformity of the heat exchange medium distribution. In addition, by making the flow direction of the heat exchange medium in the branch flow channel segments 2031a and the confluence flow channel segments 2031b opposite, when the first port 3 and the second port 4 are connected to the branch flow channel segments 2031a and the confluence flow channel segments 2031b respectively, the two ports can be concentrated, thereby reducing the complexity of the subsequent external pipeline layout.

[0057] For example, for multiple flow channel sections 2031, one flow channel section 2031 can be used as a confluence flow channel section 2031b, and the remaining flow channel sections 2031 can be used as branch flow channel sections 2031a, so that the heat exchange medium flowing into the heat exchange channel 203 has better cooling performance.

[0058] For example, since the heat exchange medium that preferentially enters the heat exchange channel 203 has better cooling performance, the first port 3 can be connected to multiple branch channel sections 2031a, and the second port 4 can be connected to the confluence channel section 2031b. In this way, the heat exchange medium entering from the first port 3 can preferentially enter the multiple branch channel sections 2031a and be evenly distributed, thereby improving the heat exchange efficiency. When the heat of the battery pack is transferred to the heat exchange medium, the heat exchange medium located in the branch channel section 2031a will flow into the confluence channel section 2031b and be discharged from the heat exchange channel 203 through the confluence channel section 2031b and the second port 4, thereby achieving effective heat release.

[0059] Furthermore, the confluence channel section 2031b can be set at the edge of the cold zone area in the cold plate 2, which can prevent the heat in the heat exchange medium inside it from being transferred back to the lower box.

[0060] In some embodiments, the stamping section 201 is provided with a plurality of guide ridges 204, the recess direction of the plurality of guide ridges 204 is opposite to the recess direction of the stamping section 201, and abuts against the base plate 1. The plurality of guide ridges 204 extend in a first direction and are arranged in parallel in a second direction; wherein, each flow channel section 2031 is provided with at least one guide ridge 204.

[0061] Specifically, since the stamped part 201 of the cold plate 2 and the bottom plate 1 together form a heat exchange channel 203, when the heat exchange medium enters the heat exchange channel 203, it can absorb the heat generated by the battery module in the lower casing and release the heat to the external environment through the flowing heat exchange medium. Figures 2-6 As shown, the stamping section 201 has multiple guide ridges 204 inside, and the concave direction of the multiple guide ridges 204 is opposite to the concave direction of the stamping section 201. When the multiple guide ridges 204 extend along the first direction and are arranged in parallel in the second direction, for any flow channel section 2031, the guide ridges 204 can divide the flow channel section 2031 into multiple first-level sub-flow channel sections 2031. This allows the heat exchange medium to be evenly distributed in each first-level sub-flow channel section 2031 after entering the flow channel, thereby improving the heat exchange efficiency.

[0062] More specifically, since the recessed direction of the multiple guide ridges 204 is opposite to the recessed direction of the stamping part 201, by having the top of the guide ridges 204 abut against the surface of the base plate 1, they can play an auxiliary supporting role for the cold plate 2, thereby improving the stability of the structure of each flow channel section 2031.

[0063] For example, the flow guide ridge 204 can be formed simultaneously with the stamping part 201 during the stamping process to simplify the preparation process of the flow guide ridge 204, which will not be described in detail here.

[0064] For example, for flow channel section 2031, the number of guide ridges 204 can be reasonably set according to its cross-sectional area, which will not be elaborated here.

[0065] In some embodiments, the base plate 1 is fixedly connected with a plurality of ribs 101, the plurality of ribs 101 abut against the cold plate 2, the plurality of ribs 101 extend in a first direction and are arranged in parallel in a second direction; wherein, each flow channel section 2031 is provided with at least one rib 101.

[0066] Specifically, such as Figure 2 and Figure 4 As shown, multiple ribs 101 can be fixedly connected to the side of the base plate 1 near the cold plate 2. For the ribs 101, by setting the ribs 101 in the flow channel section 2031 and making them abut against the surface of the cold plate 2 in the stamping part 201, the stamping part 201 can be further supported, thereby enhancing the overall strength of the heat exchange flow channel 203. At the same time, multiple ribs 101 extend along the first direction and are arranged in parallel in the second direction. Each flow channel section 2031 has at least one rib 101. In this way, the flow channel section 2031 can be divided into multiple secondary sub-flow channels by using the ribs 101, so that the heat exchange medium can be evenly distributed in each secondary sub-flow channel section 2031 after entering the flow channel, thereby effectively improving the heat exchange efficiency.

[0067] For example, the ribs 101 can be welded to the surface of the base plate 1, which improves the flexibility of the distribution of the ribs 101 on the surface of the base plate 1 and reduces the manufacturing cost of the lower box.

[0068] For example, the rib 101 can be integrally formed with the base plate 1, that is, the rib 101 is formed simultaneously when the base plate 1 is manufactured. This can improve the installation accuracy of the rib 101 on the base plate 1 and increase the connection strength between the two.

[0069] A second aspect of this application provides a battery pack, including a lower housing as described in the first aspect, wherein a receiving cavity is provided on the side of the lower housing away from the cold plate 2; and further including a plurality of battery modules located within the receiving cavity; wherein the plurality of battery modules are correspondingly disposed with respect to the heat exchange channel 203.

[0070] Specifically, regarding the battery pack, since it includes a lower housing as described in any embodiment of the first aspect, the battery pack possesses all the advantages and beneficial effects of the lower housing. More specifically, the lower housing has a receiving cavity on the side away from the cover plate, providing an installation position for components such as battery modules. Simultaneously, the multiple battery modules located within the receiving cavity can store input electrical energy and supply power to external electrical devices, thus enabling the battery pack to perform both power supply and energy storage functions.

[0071] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0075] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0076] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A lower housing, characterized in that, include: Base plate; The cold plate has a stamping part and an outer connecting part. The stamping part is recessed in a direction away from the base plate and surrounds the base plate to form a heat exchange channel. The outer connecting part surrounds the stamping part and is welded to the base plate. as well as The first port and the second port are both fixedly connected to the base plate, and one of them is connected to the inlet end of the heat exchange channel, while the other is connected to the outlet end of the heat exchange channel.

2. The lower housing according to claim 1, characterized in that, The cold plate includes a first plate layer, a second plate layer and a third plate layer stacked in sequence, and the first plate layer is fixedly connected to the base plate; The first and third plates are made of ternary aluminum, and the second plate is made of hexagonal aluminum.

3. The lower housing according to claim 2, characterized in that, The thickness of the first plate layer and the third plate layer is less than the thickness of the second plate layer.

4. The lower housing according to claim 2, characterized in that, The thickness of the cold plate is within the range of 0.8-1.5mm.

5. The lower housing according to claim 1, characterized in that, The heat exchange channel includes: Multiple flow channel segments extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; The multiple flow channel segments are connected sequentially. The flow channel segment at the beginning of the heat exchange flow channel is connected to the first port, and the flow channel segment at the end of the heat exchange flow channel is connected to the second port. The heat exchange medium in adjacent flow channel segments flows in opposite directions.

6. The lower housing according to claim 1, characterized in that, The heat exchange channel includes: Multiple flow channel segments extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; some of the multiple flow channel segments are branch flow channel segments and some are converging flow channel segments; The branch flow channel segment is connected to the confluence flow channel segment, and one of them is connected to the first port and the other is connected to the second port. The heat exchange medium flows in the opposite direction to the flow direction in the branch channel section and the flow converge channel section.

7. The lower housing according to claim 5 or 6, characterized in that, The stamping section has multiple guide ridges, the recesses of which are opposite to the recesses of the stamping section and abut against the base plate. Multiple flow-guiding ridges extend in the first direction and are arranged in parallel in the second direction; Each of the flow channel sections is provided with at least one of the flow guide ridges.

8. The lower housing according to claim 7, characterized in that, The base plate is fixedly connected to multiple ribs, which abut against the cold-rolled plate. Multiple ribs extend in the first direction and are arranged in parallel in the second direction; Each of the flow channel sections is provided with at least one of the ribs.

9. The lower housing according to claim 1, characterized in that, The peripheral connecting part is connected to the base plate by friction stir welding or by laser welding.

10. A battery pack, characterized in that, include: The lower housing as described in any one of claims 1-9, wherein a receiving cavity is provided on the side of the lower housing away from the cold plate; as well as Multiple battery modules are located within the receiving cavity; the multiple battery modules are correspondingly arranged with respect to the heat exchange channels.

Images