Battery box and battery

Abstract

The invention relates to a battery box and a battery. The battery box comprises a box body and a liquid cooling plate. The liquid cooling plate comprises a runner plate, a heat exchange plate and a reinforcing plate. The flow channel plate is provided with a flow channel face located in the thickness direction and comprises a middle flow channel and an edge flow channel which are sunken in the flow channel face and protrude towards the other side of the flow channel plate, the edge flow channel is arranged on the periphery of the middle flow channel, and the thickness of the bottom wall of the edge flow channel is larger than that of the bottom wall of the middle flow channel. The heat exchange plate covers the runner face and seals the middle runner and the edge runner, the heat exchange plate and the runner plate jointly form a heat exchange area and an installation area on the liquid cooling plate, the middle runner and the edge runner are located in the heat exchange area, the installation area is located on the side, away from the middle runner, of the edge runner, and the liquid cooling plate is fixed to the box body through the installation area. And the reinforcing plate is at least partially arranged on the bottom wall of the edge runner. The liquid cooling plate can solve the problem that the flow channel at the edge position of the liquid cooling plate is easy to break and leaks liquid.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery boxes and batteries. Background Technology

[0002] To improve battery operating temperature and extend battery life, battery boxes often incorporate liquid cooling plates for heat exchange with individual battery cells. In existing battery box assembly and liquid cooling plate designs, the liquid cooling plates are typically fixed to the battery box body using bolts or friction stir welding. Since the individual battery cells are located above the liquid cooling plate in the Z-axis direction, the liquid cooling plate bears the Z-axis load of the individual battery cells. During Z-axis vibration, the liquid cooling plate is prone to breakage, leading to coolant leakage. Summary of the Invention

[0003] Therefore, it is necessary to provide a battery box and battery to address the problem of liquid cooling plates easily breaking and leaking.

[0004] In a first aspect, this application provides a battery box, comprising:

[0005] Box; and

[0006] Liquid cooling plates, including,

[0007] A flow channel plate having a flow channel surface located in its thickness direction, the flow channel plate including a central flow channel and an edge flow channel recessed in the flow channel surface and protruding to the other side of the flow channel plate, the edge flow channel being arranged around the central flow channel, and the thickness of the bottom wall of the edge flow channel being greater than the thickness of the bottom wall of the central flow channel;

[0008] A heat exchange plate covers the flow channel surface and seals the central flow channel and the edge flow channel. The heat exchange plate and the flow channel plate together form a heat exchange area and an installation area on the liquid cooling plate. The central flow channel and the edge flow channel are located in the heat exchange area, and the installation area is located on the side of the edge flow channel opposite to the central flow channel. The liquid cooling plate is fixed to the housing through the installation area.

[0009] A reinforcing plate is at least partially disposed on the bottom wall of the edge channel.

[0010] In some embodiments, the outer surface of the bottom wall of the edge channel is coplanar with the outer surface of the bottom wall of the central channel;

[0011] The depth of the edge channel along the thickness direction is s1, and the depth of the middle channel along the thickness direction is s2, where s1 < s2.

[0012] In some embodiments, s1 and s2 satisfy: 3mm≤s1≤4mm, 3mm≤s2≤4mm.

[0013] In some embodiments, the inner radius of the transition arc between the sidewall and bottom wall of the edge channel is R1, and the inner radius of the transition arc between the sidewall and bottom wall of the middle channel is R2, where R1 > R2.

[0014] In some embodiments, 2mm≤R1≤4mm, 2mm≤R2≤4mm.

[0015] In some embodiments, the edge channel includes a first edge channel extending along the length direction of the liquid cooling plate, the first edge channel extending from one end to the other end along the length direction of the channel plate, and the reinforcing plate being longitudinally disposed along the extension direction of the first edge channel.

[0016] In some embodiments, the thickness of the reinforcing plate is 0.5 mm to 1.2 mm.

[0017] In some embodiments, the reinforcing plate is disposed on the side of the flow channel plate opposite to the heat exchange plate.

[0018] In some embodiments, the flow channel plate includes a non-flow channel region, the central flow channel and the edge flow channel are recessed relative to the non-flow channel region, one end of the reinforcing plate is connected to the bottom wall of the edge flow channel and the other end is connected to the non-flow channel region, and there is a gap between the central region of the reinforcing plate and the side wall of the edge flow channel.

[0019] In some embodiments, the non-channel region includes an edge region and an inner region, the edge region being located on the side of the edge channel away from the central channel, the inner region being located between the edge channel and the central channel, and the width of the edge region being greater than the width of the inner region;

[0020] The reinforcing plate connects at least one of the edge region and the inner region.

[0021] In some embodiments, the edge region corresponds to the mounting area of ​​the liquid cooling plate. When the liquid cooling plate is welded to the housing in the mounting area, the reinforcing plate connects to the inner region; when the liquid cooling plate is bolted to the housing in the mounting area, the reinforcing plate connects to the edge region.

[0022] In some embodiments, in the width direction of the edge channel, the projection dimension w1 of the portion of the reinforcing plate covering the bottom wall of the edge channel in the horizontal plane and the projection dimension w2 of the edge channel in the horizontal plane satisfy: 1 / 2 ≤ w1 / w2 ≤ 2 / 3.

[0023] Secondly, this application provides a battery, including a battery cell and the battery case described in the first aspect, wherein the battery cell is thermally connected to the heat exchange plate of the heat exchange zone.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The aforementioned battery box and battery feature a thickened bottom wall for the edge flow channels in the liquid cooling plate, further reinforced with reinforcing plates. This dual enhancement of the edge flow channel strength reduces the risk of breakage during Z-axis vibration, preventing liquid leakage from the liquid cooling plate. Furthermore, by adjusting only the strength of the edge flow channels, rather than adjusting the strength of all channels, the weight increase of the liquid cooling plate is minimal, contributing to a reduction in the battery box weight. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is an exploded view of the battery box in some embodiments.

[0028] Figure 2 This is a schematic diagram of the structure of a liquid cooling plate in some embodiments.

[0029] Figure 3 for Figure 2 The diagram shown is an exploded view of the liquid cooling plate.

[0030] Figure 4 This is a top view schematic diagram of the flow channel plate in some embodiments;

[0031] Figure 5 This is a bottom view schematic diagram of the liquid cooling plate in some embodiments.

[0032] Figure 6 for Figure 5 The diagram shows a cross-sectional view of the liquid cooling plate.

[0033] Figure 7 This is a bottom view of a liquid cooling plate in some other embodiments.

[0034] Figure 8 for Figure 7 The diagram shows a cross-sectional view of the liquid cooling plate.

[0035] Figure 9 This is a bottom view of a liquid cooling plate in some other embodiments.

[0036] Figure 10 for Figure 9 The diagram shows a cross-sectional view of the liquid cooling plate.

[0037] The reference numerals in the detailed embodiments are as follows:

[0038] 1000, Battery box; 100, Liquid cooling plate; Z, Thickness direction; X, Width direction; Y, Length direction; K1, Heat exchange zone; K2, Mounting zone; 10, Flow channel plate; m, Flow channel surface; 11, Edge flow channel; 111, First edge flow channel; 112, Second edge flow channel; 12, Central flow channel; m1, Bottom wall; m2, Side wall; 13, Non-flow channel area; 13a, Edge area; 13b, Inner area; 20, Heat exchange plate; 30, Reinforcing plate; 31, First part; 32, Second part; 33, Third part; j, Gap; 200, Box body; 201, Frame; 202, Box cover; 203, Base plate. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, where applicable, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] The inventors discovered that the edges of liquid cooling plates are often fixed to the battery box body using bolts or friction stir welding. Since the battery cells are located above the liquid cooling plate in the Z-direction, the liquid cooling plate bears the Z-direction load of the battery cells. During Z-direction vibration, stress concentration occurs at the edges of the liquid cooling plate, and the flow channel area at the edge is particularly prone to fracture. This application addresses the problem of stress concentration and fracture in the flow channel at the edge of the liquid cooling plate during Z-direction vibration by proposing a battery box and battery. This battery box and battery optimize the design of the flow channel at the edge of the liquid cooling plate and reinforce it without changing the overall design of the battery box or the assembly process of the liquid cooling plate, thereby increasing the strength of the flow channel and reducing the risk of fracture.

[0046] The battery in this embodiment includes a battery case and individual battery cells. Multiple battery cells are housed within the battery case. These cells can be electrically connected in series, parallel, or a combination of both. Each battery cell is the smallest unit in the battery where an electrochemical reaction occurs; it can be a secondary or primary battery. A battery cell can be a lithium-ion, sodium-ion, or magnesium-ion battery, but is not limited to these types. A battery cell can be cylindrical, flat, cuboid, or other shapes.

[0047] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a receiving cavity may be formed within the housing, with at least one end open. The end cap closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing.

[0048] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the battery cell, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within a single battery cell.

[0049] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack also includes a battery management system (BMS). The individual battery cells communicate with the battery management system through signal acquisition components, and the battery management system controls and monitors the operating status of each individual battery cell. Alternatively, multiple individual battery cells can first be connected to a module management system via signal acquisition components to form a battery module, and then multiple battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0050] The battery box in the embodiments of this application is described in detail below.

[0051] Combination Figure 1 , Figures 2 to 5Understood, the battery box 1000 in this embodiment includes a box body 200 and a liquid cooling plate 100. The liquid cooling plate 100 includes a flow channel plate 10, a heat exchange plate 20, and a reinforcing plate 30. The flow channel plate 10 has a flow channel surface m located in the thickness direction Z. The flow channel plate 10 includes a central flow channel 12 recessed in the flow channel surface m and protruding to the other side of the flow channel plate 10, and an edge flow channel 11. The edge flow channel 11 is arranged around the central flow channel 12, and the thickness of the bottom wall m1 of the edge flow channel 11 is greater than the thickness of the bottom wall m1 of the central flow channel 12. The heat exchange plate 20 covers the flow channel surface m and seals the central flow channel 12 and the edge flow channel 11. The heat exchange plate 20 and the flow channel plate 10 together form a heat exchange zone K1 and an installation zone K2 on the liquid cooling plate 100. The central flow channel 12 and the edge flow channel 11 are located in the heat exchange zone K1, and the installation zone K2 is located on the side of the edge flow channel 11 away from the central flow channel 12. The liquid cooling plate 100 is fixed to the housing 200 through the installation zone K2. The reinforcing plate 30 is at least partially disposed on the bottom wall m1 of the edge flow channel 11.

[0052] Understandably, the battery box 1000 has a receiving space for accommodating individual battery cells. In one embodiment, refer to... Figure 1 The housing 200 includes a frame 201, a bottom plate 203, and a cover 202. The frame 201 forms a U-shaped structure with open ends. The bottom plate 203 and the cover 202 are respectively located at the two open ends of the frame 201. The three together enclose the receiving space. A liquid cooling plate 100 is disposed within this receiving space, and the battery cells are supported above the liquid cooling plate 100. The liquid cooling plate 100 can be fixed to the connecting frame 201 or the bottom plate 203. In another embodiment, the housing 200 and the liquid cooling plate 100 together enclose the receiving space. The liquid cooling plate 100 also functions as the bottom plate 203 and is located at the end of the frame 201 away from the cover 202. In this case, the liquid cooling plate 100 is fixed to the frame 201.

[0053] The liquid cooling plate 100 has a heat exchange area K1 and an installation area K2. The installation area K2 is located outside the heat exchange area K1. The liquid cooling plate 100 is fixedly connected to the housing 200 through the installation area K2. The liquid cooling plate 100 exchanges heat with the battery cells through the heat exchange area K1.

[0054] Specifically, the liquid cooling plate 100 includes stacked flow channel plates 10 and heat exchange plates 20. The flow channel plate 10 is located at the bottom, and a central flow channel 12 and an edge flow channel 11 are machined on its flow channel surface m. The edge flow channel 11 is arranged around the central flow channel 12. The heat exchange plate 20 is located at the top, covering the flow channel surface m and sealing the central flow channel 12 and the edge flow channel 11. The central flow channel 12 and the edge flow channel 11 are located in the heat exchange zone K1. The coolant flowing through the central flow channel 12 and the edge flow channel 11 exchanges heat with the battery cells through the heat exchange plate 20 located in the heat exchange zone K1. The edge portion of the flow channel plate 10 and the heat exchange plate 20 located on the side of the edge flow channel 11 opposite to the central flow channel 12 forms the mounting area K2. The housing 200 is fixed to at least one of the flow channel plate 10 and the heat exchange plate 20 located in the mounting area K2. It is worth mentioning that the edge channel 11 and the middle channel 12 can be connected to each other or not.

[0055] As easily understood, the flow channel (including the edge flow channel 11 and the central flow channel 12) includes a bottom wall m1 and a side wall m2, with the side wall m2 connecting the bottom wall m1 and the flow channel surface m. The thickness of the bottom wall m1 refers to the minimum dimension of the bottom wall m1 in the thickness direction Z of the flow channel plate 10. For example... Figure 6 As shown, the thickness of the bottom wall m1 of the edge flow channel 11 is h1, and the thickness of the bottom wall m1 of the middle flow channel 12 is h2, h1>h2, which makes the strength of the edge flow channel 11 higher than that of the middle flow channel 12, thereby reducing the problem of stress concentration and easy breakage at the edge.

[0056] Furthermore, a reinforcing plate 30 is provided on the bottom wall m1 of the edge flow channel 11 to further enhance the strength of the bottom wall m1. Specifically, the reinforcing plate 30 can be arranged inside the edge flow channel 11 (i.e., on the inner surface of the bottom wall m1) or outside the edge flow channel 11 (i.e., on the outer surface of the bottom wall m1). The reinforcing plate 30 can be fixedly connected to the bottom wall m1 of the edge flow channel 11 by welding, bonding, or other methods. Alternatively, the reinforcing plate 30 can be arranged longitudinally along the extension direction of the edge flow channel 11 to reinforce a larger area of ​​the edge flow channel 11.

[0057] In the aforementioned battery box 1000, the bottom wall m1 of the edge flow channel 11 of the liquid cooling plate 100 is thickened, and a reinforcing plate 30 is used to reinforce the bottom wall m1 of the edge flow channel 11. This double enhancement of the edge flow channel 11 reduces the risk of breakage during Z-axis vibration and prevents leakage of the liquid cooling plate 100. Furthermore, by adjusting only the strength of the edge flow channel 11 rather than adjusting the strength of the entire flow channel, the weight increase of the liquid cooling plate is small, which helps to reduce the weight of the battery box.

[0058] In some embodiments, refer to Figure 6The outer surface of the bottom wall m1 of the edge flow channel 11 is coplanar with the outer surface of the bottom wall m1 of the middle flow channel 12. The recess depth of the edge flow channel 11 along the thickness direction Z is s1, and the recess depth of the middle flow channel 12 along the thickness direction Z is s2, where s1 < s2.

[0059] The recess depth of the flow channel refers to the distance between the flow channel surface m and the bottom wall m1 in the thickness direction Z. The outer surface of the bottom wall m1 of the edge flow channel 11 is coplanar with the outer surface of the bottom wall m1 of the middle flow channel 12, that is, the outer surfaces of the two bottom walls m1 are flush in the thickness direction Z. The recess depth s1 of the edge flow channel 11 is less than the recess depth s2 of the middle flow channel 12, so that the thickness h1 of the bottom wall m1 of the edge flow channel 11 is greater than the thickness h2 of the bottom wall m1 of the middle flow channel 12.

[0060] In existing stamping processes, the recess depths of the edge runner 11 and the central runner 12 are the same, and the corresponding portions of the stamping die used for the edge runner 11 and the central runner 12 have the same depth. This application thickens the bottom wall m1 of the edge runner 11. In practical applications, existing stamping dies with varying depths can be used on plates of uniform thickness. While maintaining the stamping process of the central runner 12 unchanged, the bottom wall m1 of the edge runner 11 is thickened by reducing its stamping depth, resulting in edge runners 11 and central runners 12 with coplanar outer surfaces of the bottom walls m1 and unequal recess depths. Furthermore, the widths of the stamping dies are also different, making the recess width of the edge runner 11 greater than the recess width of the central runner 12, where the recess width can be the maximum width in the width direction. By increasing the recess width of the edge flow channel 11, the material of the flow channel plate 10 is more easily accumulated at the bottom of the flow channel during the stamping process. At the same time, the compressive force received by the material during the stamping process is more widely distributed, thereby increasing the bottom thickness of the edge flow channel 11. In this way, the flow channel plate 10 is not only simple to process, but the edge flow channel 11 does not increase the space occupied by the liquid cooling plate 10 in the aforementioned thickness direction Z, which helps to improve the space utilization rate inside the battery box, thereby increasing the battery capacity.

[0061] Furthermore, by setting the stamping depth and width of the edge flow channel 11 and the stamping depth and width of the middle flow channel 12, the thickness of the sidewall m2 of the edge flow channel 11 can be made greater than the thickness of the sidewall m2 of the middle flow channel 12. During the stamping process, the sidewall portion of the material is subjected to tensile force, and the sidewall flows towards the bottom, resulting in a decrease in thickness. If the recess depth is too large, the bottom thickness increases, and the material accumulates at the bottom, which can easily lead to a decrease in the sidewall thickness. Therefore, in this application, the recess depth of the edge flow channel 11 along the thickness direction Z is set to be less than the recess depth of the middle flow channel 12, thereby ensuring the thickness of the sidewall m2 of the edge flow channel 11 and avoiding stress concentration at this point, which could lead to cracking.

[0062] It should be noted that, due to the stamping process, the thickness of the bottom wall of the edge flow channel 11 is greater than the thickness of the side wall of the edge flow channel 11. Therefore, at the edge flow channel 11, it is necessary not only to increase the thickness of the bottom wall m1, but also the thickness of the side wall m2. Through the design of this application, the thickness of both the bottom wall m1 and the side wall m2 of the edge flow channel 11 can be increased simultaneously using existing processes, thereby providing overall strength and preventing cracking. Simultaneously, this design, with its wider and shallower flow channels, also increases the cross-sectional area of ​​the edge flow channel 11, making it larger than the cross-sectional area of ​​the central flow channel 12. This effectively reduces the pressure drop of the edge flow channel 11, resulting in more uniform fluid distribution, reduced localized overheating, and, as the main flow channel of the entire liquid cooling plate, the lower pressure drop of the edge flow channel 11 can accommodate higher flow rate requirements, reducing energy loss during fluid flow and improving the overall system efficiency.

[0063] In other embodiments, the slab structure of the flow channel plate 10 can be changed. Based on the existing slab, the thickness of the slab portion corresponding to the edge flow channel 11 can be increased, and the stamping die can be improved to deepen the depth of the stamping groove corresponding to the edge flow channel in the stamping die. This makes the inner surface of the bottom wall m1 of the edge flow channel 11 coplanar with the inner surface of the bottom wall m1 of the middle flow channel 12, but not coplanar. The recess depth s1 of the edge flow channel 11 is equal to the recess depth s2 of the middle flow channel 12. This results in a flow channel plate 10 where the thickness h1 of the bottom wall m1 of the edge flow channel 11 is greater than the thickness of the bottom wall m1 of the middle flow channel 12.

[0064] Specifically, in this embodiment, 3mm ≤ s1 ≤ 4mm, and 3mm ≤ s2 ≤ 4mm. Specifically, s1 and s2 can be selected as 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, or any value between adjacent selections. Generally, changes in the channel recess depth affect the channel velocity; with a constant flow rate, a narrower channel cross-section results in a higher velocity. Changes in the channel recess depth also affect channel heat dissipation. Channel heat dissipation is mainly related to the fluid state. Currently, the fluid state in the channels of stamped plate solutions is mostly laminar, so changes in recess depth have a very limited impact on heat dissipation. In this embodiment, the recess depth of the edge channel 11 and the central channel 12 is designed to be in the range of 3mm to 4mm, comprehensively considering factors such as the plate stamping process and flow resistance, reducing the degree of change to the stamping process and minimizing the impact on channel flow resistance. Moreover, when both s1 and s2 are within this range, the overall pressure drop of the liquid cooling plate channel is small. Even if a small amount of channel depth of the edge channel 11 is sacrificed, the heat exchange effect of the liquid cooling plate is not significantly affected, but the strength of the edge channel 11 can be effectively enhanced, reducing the risk of its breakage.

[0065] In some embodiments, refer to Figure 6The inner radius of the transition arc between the sidewall m2 and the bottom wall m1 of the edge flow channel 11 is R1, and the inner radius of the transition arc between the sidewall m2 and the bottom wall m1 of the middle flow channel 12 is R2, where R1 > R2. This can further improve the strength of the edge flow channel 11 compared to the middle flow channel 12.

[0066] The sidewall m2 and bottomwall m1 of the flow channel are usually designed with a rounded transition connection to avoid stress concentration at the connection point, which could lead to flow channel damage. The rounded transition can also reduce the flow resistance of the cold flow channel.

[0067] The inner radius of the transition arc is the radius of the concave surface of the arc. The larger the inner radius of the transition arc, the lower the stamping thinning rate at the transition arc, and the greater the thickness at the transition arc. In this case, setting the inner radius R1 of the transition arc of the edge flow channel 11 to be larger than the inner radius of the transition arc of the central flow channel 12 increases the thickness at the transition arc of the edge flow channel 11, improves the strength of the edge flow channel 11, further reduces stress concentration, and thus reduces the risk of fracture of the edge flow channel 11.

[0068] Further in the embodiment, 2mm ≤ R1 ≤ 4mm, 2mm ≤ R2 ≤ 4mm. In the flow channel stamping process, the thinning rate at the transition arc is generally required to not exceed 20%. Tests have shown that when R1 and R2 are between 2mm and 4mm, the stamping thinning rate requirement can be met. Understandably, the inner radius of the flow channel's transition arc is the same as the radius of the transition arc at the end of the stamping head. If the inner radius of the flow channel's transition arc is too small, it indicates that the radius of the transition arc at the end of the stamping head is too small. The plate position where the stamping head acts is prone to stress concentration and fracture, increasing the difficulty of the stamping process. In addition, an excessively small radius can easily lead to large tensile deformation of the material at the sidewall m2, resulting in a reduction in the thickness of the sidewall m2 and a decrease in strength. Here, limiting the lower limit of R1 and R2 to 2mm will not increase the stamping difficulty and can meet the strength requirements. If the inner radius of the transition arc of the flow channel is too large, the flow area of ​​the channel will be smaller and the flow resistance will increase under the same flow channel width and recess depth, which is not conducive to heat exchange of the liquid cooling plate 100. In addition, an excessively large radius is also not conducive to material accumulation at the bottom, making it impossible to form a thick bottom wall m1. Here, the upper limit of R1 and R2 is limited to 4mm, which can balance the requirements of strength and flow resistance.

[0069] In some embodiments, refer to Figure 5 , Figure 7 and Figure 9 The edge channel 11 includes a first edge channel 111 extending along the length direction Y of the liquid cooling plate 100. The first edge channel 111 extends from one end of the channel plate 10 along the length direction Y to the other end. The reinforcing plate 30 is longitudinally arranged along the extension direction of the first edge channel 111.

[0070] Understandably, first edge channels 111 are provided at both ends of the width direction of the flow channel plate 10. In a specific example, the liquid cooling plate 100 is fixedly connected to the housing 200 through the mounting area K2 located on the side of the first edge channel 111 away from the central channel 12.

[0071] At this time, a reinforcing plate 30 is provided on the first edge flow channel 111, which can effectively enhance the strength of the first edge flow channel 111 and reduce the problem of the first edge flow channel 111 breaking due to stress concentration when the installation area K2 is connected to the box 200.

[0072] The edge flow channel 11 extending along the width direction X of the liquid cooling plate 100 is the second edge flow channel 112. The mounting area K2 located on the side of the second edge flow channel 112 away from the middle flow channel 12 is fixed to the housing 200. However, the stress concentration problem here is less than that at the first edge flow channel 111. Therefore, the reinforcing plate 30 does not need to be set at the second edge flow channel 112 to reduce the weight of the battery box 1000.

[0073] In some embodiments, the thickness of the reinforcing plate 30 is 0.5 mm to 1.2 mm. For example, the thickness of the reinforcing plate 30 is selected from 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, and any values ​​between adjacent selections. If the reinforcing plate 30 is too thin, the reinforcement effect on the edge flow channel 11 is not significant; if it is too thick, it increases the weight of the battery box 1000. When the reinforcing plate 30 is within the above range, not only is the reinforcement effect good, but the increase in weight is also moderate, resulting in a small space occupancy within the battery box 1000 and a minimal impact on battery capacity.

[0074] It is worth noting that when the reinforcing plate 30 is set in the edge flow channel 11, in order to reduce the amount of reinforcing plate 30 used and reduce the weight and cost of the battery box 1000, the arrangement position of the reinforcing plate 30 can be adapted to the actual fixed position between the installation area K2 and the box 200, as well as the stress concentration problem. In one embodiment, the stress concentration in the edge flow channel 11 near the fixed position is significant, and the reinforcing plate 30 is set in these edge flow channel 11 parts. The stress concentration in the edge flow channel 11 parts away from the fixed position is weaker, and the reinforcing plate 30 may not be set in these edge flow channel 11 parts. The specific arrangement position of the reinforcing plate 30 is designed according to the stress analysis results of the liquid cooling plate 100.

[0075] In some embodiments, refer to Figure 5 , Figure 7 and Figure 9 The reinforcing plate 30 is disposed on the side of the flow channel plate 10 away from the heat exchange plate 20. That is, the reinforcing plate 30 is disposed at least on the outer surface of the bottom wall m1 of the edge flow channel 11. In this way, the reinforcing plate 30 does not occupy the flow channel space of the edge flow channel 11, does not obstruct the flow of coolant, and does not affect the heat exchange effect of the liquid cooling plate 100.

[0076] In some embodiments, combined with Figures 5 to 10 It is understood that the flow channel plate 10 includes a non-flow channel region 13, a central flow channel 12, and an edge flow channel 11 recessed relative to the non-flow channel region 13. One end of the reinforcing plate 30 is connected to the bottom wall m1 of the edge flow channel 11, and the other end is connected to the non-flow channel region 13. There is a gap j between the central region of the reinforcing plate 30 and the side wall m2 of the edge flow channel 11.

[0077] As easily understood, the non-flow channel region 13 is the area of ​​the flow channel plate 10 excluding the central flow channel 12 and the edge flow channel 11, and is fixedly connected to the heat exchange plate 20 through the non-flow channel region 13. Figure 6 , Figure 8 and Figure 10 As shown, the reinforcing plate 30 is divided into three parts: a first part 31 connected to the bottom wall m1 of the edge flow channel 11, a second part 32 connected to the non-flow channel area 13, and a third part 33 connected between the first part 31 and the second part 32. The third part 33 is the middle area of ​​the reinforcing plate 30, which is opposite to the side wall m2 of the edge flow channel 11.

[0078] Can the first part 31 be welded to and bonded to the bottom wall m1, and the second part 32 be welded to and bonded to the non-flow channel area 13? At this time, a gap j exists between the third part 33 and the side wall m2 of the edge flow channel 11, resulting in a higher shape tolerance for the reinforcing plate 30. This reduces the processing difficulty of the reinforcing plate 30 and makes it easier to ensure that the first part 31 and the second part 32 are respectively shaped to fit the bottom wall m1 and the non-flow channel area 13, reducing the risk of deformation of the flow channel plate 10 due to forced bonding caused by shape mismatch between the first part 31 and the second part 32. Furthermore, since the inner radius R1 of the transition arc of the edge flow channel 11 is larger than the inner radius of the transition arc of the central flow channel 12, it also facilitates the processing and fit between the edge flow channel 11 and the reinforcing plate 30. In an optional embodiment, welding the third part 33 and the side wall m2 of the edge flow channel 11 is unnecessary, simplifying the welding process. In addition, the reinforcing plate 30 connects the bottom wall m1 of the edge flow channel 11 and the non-flow channel area 13. The stress at the edge flow channel 11 can be dispersed to the non-flow channel area 13 through the reinforcing plate 30, reducing the risk of edge flow channel 11 fracture.

[0079] In some embodiments, combined with Figures 5 to 10 It is understood that the non-flow channel region 13 includes an edge region 13a and an inner region 13b. The edge region 13a is located on the side of the edge flow channel 11 opposite to the central flow channel 12, and the inner region 13b is located between the edge flow channel 11 and the central flow channel 12. The width of the edge region 13a is greater than the width of the inner region 13b. A reinforcing plate 30 connects at least one of the edge region 13a and the inner region 13b.

[0080] In the fabrication process of the liquid cooling plate, the flow channel plate 10 and the heat exchange plate 20 are first welded at high temperature, and then cooled. The edge region 13a of the liquid cooling plate 100 has a large contact area with the air and dissipates heat faster than the inner region 13b, thus making the edge region 13a prone to warping and deformation. The reinforcing plate 30 can increase the weight and suppress the warping and deformation of the edge region 13a of the liquid cooling plate 100 under the action of gravity.

[0081] The width of edge region 13a refers to its dimension in the direction perpendicular to its extension direction. Similarly, the width of inner region 13b refers to its dimension in the direction perpendicular to its extension direction. If the reinforcing plate 30 is provided in the first edge channel 111, and the edge region 13a and inner region 13b corresponding to the first edge channel 111 are spaced apart in the width direction X of the liquid cooling plate 100, then the widths of both edge region 13a and inner region 13b refer to their dimensions in the width direction X of the liquid cooling plate 100. If the reinforcing plate 30 is provided in the second edge channel 112, and the edge region 13a and inner region 13b corresponding to the second edge channel are spaced apart in the length direction Y of the liquid cooling plate 100, then the widths of both edge region 13a and inner region 13b refer to their dimensions in the length direction Y of the liquid cooling plate 100.

[0082] Understandably, edge region 13a is located in mounting area K2. In practical applications, if edge region 13a is adjacent to the first edge flow channel 111, the edge portion of edge region 13a can be used as a fixing area to be fixed to the housing 200. In this case, the width of edge region 13a is set to be greater than the width of inner region 13b. On the one hand, this can make the edge flow channel 11 and the fixing area a certain distance apart, reducing the influence of stress at the fixing area on the edge flow channel 11. On the other hand, a certain area can be reserved in the width direction of edge region 13a to connect with reinforcing plate 30, avoiding interference between reinforcing plate 30 and fixing area.

[0083] Specifically, the reinforcing plate 30 can be connected to the edge region 13a adjacent to the edge channel 11, or to the inner region 13b adjacent to the edge channel 11, or to both the edge region 13a and the inner region 13b adjacent to the edge channel 11, so as to effectively disperse the stress on the edge channel 11 and reduce the risk of breakage of the edge channel 11.

[0084] In practical applications, combined with Figure 5 , Figure 7 and Figure 9It is understood that multiple reinforcing plates 30 can be configured for the corresponding edge flow channel 11. Some reinforcing plates 30 connect the bottom wall m1 of the edge flow channel 11 and the edge region 13a, some reinforcing plates 30 connect the bottom wall m1 of the edge flow channel 11 and the inner region 13b, and some reinforcing plates 30 connect the bottom wall m1, the inner region 13b and the edge region 13a of the edge flow channel 11 at the same time.

[0085] Specifically, in this embodiment, edge region 13a corresponds to mounting area K2 of liquid cooling plate 100. When liquid cooling plate 100 is welded to housing 200 in mounting area K2, reinforcing plate 30 connects to inner region 13b. When liquid cooling plate 100 is bolted to housing 200 in mounting area K2, reinforcing plate 30 connects to edge region 13a.

[0086] In one specific example, the housing 200 and the mounting area K2 of the liquid cooling plate 100 are welded together using friction stir welding. Friction stir welding requires the liquid cooling plate 100 and the housing 200 to have a certain penetration weld width. The reinforcing plate 30 needs to be positioned to avoid the welding area. In this case, connecting it to the inner area 13b can effectively avoid the welding area. In another specific example, the liquid cooling plate 100 is connected to the housing 200 in the mounting area K2 by bolts. In this case, the reinforcing plate 30 is placed in the edge area 13a, avoiding the bolts. The reinforcing plate 30 disperses the stress to the edge area 13a, which, compared to dispersing it to the inner area 13b, can reduce the impact of stress in the fixed area on the central flow channel 12, thus preventing damage and leakage of the central flow channel 12.

[0087] In some embodiments, combined with Figure 10 It is understood that, in the width direction of the edge channel 11, the projection size w1 of the part of the bottom wall m1 of the edge channel 11 covered by the reinforcing plate 30 in the horizontal plane and the projection size w2 of the edge channel 11 in the horizontal plane satisfy: 1 / 2≤w1 / w2≤2 / 3.

[0088] The horizontal projection of the edge channel 11 onto the width direction of the edge channel 11 is dimension w2, which is determined by the distance between the opposite ends of the two sidewalls m2 of the edge channel 11 in the width direction of the edge channel 11, i.e., the width of the edge channel 11. If the reinforcing plate 30 is provided in the first edge channel 111, the width direction of the first edge channel 111 corresponds to the width direction X of the liquid cooling plate 100. The portion of the reinforcing plate 30 that covers the bottom wall m1 of the edge channel 11 is the first portion 31 of the reinforcing plate 30, and w1 refers to the dimension of the first portion 31 in the width direction of the edge channel 11.

[0089] Specifically, the ratio of w1 / w2 can be selected as 1 / 2, 0.6, 2 / 3, or any value between adjacent selections. If the ratio of w1 / w2 is too small, the contact area between the reinforcing plate 30 and the bottom wall m1 is too small, which can easily lead to unreliable welding. If the ratio of w1 / w2 is too large, the contact area between the reinforcing plate 30 and the bottom wall m1 is too large, resulting in higher welding costs. When w1 / w2 is selected within the above range, the connection strength between the bottom wall m1 and the reinforcing plate 30 can be guaranteed while reducing welding costs.

[0090] In one specific embodiment, the housing 200 includes a frame 201, and the mounting area K2 of the liquid cooling plate 100 is welded and fixed to the frame 201. The thickness of the bottom wall m1 of the edge flow channel 11 is greater than the thickness of the bottom wall m1 of the middle flow channel 12, and the outer surfaces of the bottom walls m1 of both are coplanar. The thickness of the side wall m2 of the edge flow channel 11 is greater than the thickness of the side wall m2 of the middle flow channel 12. The inner radius of the transition fillet of the edge flow channel 11 is greater than the inner radius of the transition fillet of the middle flow channel 12. A reinforcing plate 30 is provided on the outer surface of the bottom wall m1 of the edge flow channel 11, and the reinforcing plate 30 is welded to the inner region 13b adjacent to the edge flow channel 11. The reinforcing plate 30 can be a composite plate of 4-series aluminum and 3-series aluminum, with flux sprayed on its surface, and welded to the inner region 13b.

[0091] In another specific embodiment, the housing 200 includes a frame 201, and the mounting area K2 of the liquid cooling plate 100 is bolted to the frame 201. The thickness of the bottom wall m1 of the edge flow channel 11 is greater than the thickness of the bottom wall m1 of the middle flow channel 12, and the outer surfaces of the bottom walls m1 of both are coplanar. The thickness of the side wall m2 of the edge flow channel 11 is greater than the thickness of the side wall m2 of the middle flow channel 12. The inner radius of the transition fillet of the edge flow channel 11 is greater than the inner radius of the transition fillet of the middle flow channel 12. A reinforcing plate 30 is provided on the outer surface of the bottom wall m1 of the edge flow channel 11, and the reinforcing plate 30 is welded to the edge region 13a adjacent to the edge flow channel 11. The reinforcing plate 30 can be a composite plate of 4-series aluminum and 3-series aluminum, with flux sprayed on its surface and welded to the edge region 13a.

[0092] The battery provided in this application embodiment includes a battery cell and a battery case 1000 as described in any of the above embodiments. The battery cell is thermally connected to the heat exchange plate 20 of the heat exchange zone K1. This battery includes all the aforementioned beneficial effects, which will not be elaborated here.

[0093] The technical features described in the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery box characterized by, The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20).

2. The battery pack of claim 1, wherein, The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20).

3. The battery pack of claim 1, wherein, The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20).

4. The battery pack of claim 1, wherein, The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20).

5. The battery box according to any one of claims 1 to 4, characterized in that, The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). 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The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). 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The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange plate (20). The application relates to a liquid cooling plate (100) comprising a flow channel plate (10) and a heat exchange 6. The battery pack of claim 5, wherein, The flow channel plate (10) comprises a non-flow channel area (13), the middle flow channel (12) and the edge flow channel (11) are recessed relative to the non-flow channel area (13), one end of the reinforcing plate (30) is connected with the bottom wall (m1) of the edge flow channel (11), the other end is connected with the non-flow channel area (13), and the middle area of the reinforcing plate (30) has a gap (j) with the side wall (m2) of the edge flow channel (11).

7. The battery pack of claim 6, wherein, The non-flow channel area (13) comprises an edge area (13a) and an inner side area (13b), the edge area (13a) is located on the side of the edge flow channel (11) away from the middle flow channel (12), and the inner side area (13b) is located between the edge flow channel (11) and the middle flow channel (12), the width of the edge area (13a) is greater than the width of the inner side area (13b). The reinforcing plate (30) is connected with at least one of the edge area (13a) and the inner side area (13b).

8. The battery pack of claim 7, wherein, The edge area (13a) corresponds to the mounting area (K2) of the liquid cooling plate (100), when the liquid cooling plate (100) is welded and connected with the box body (200) at the mounting area (K2), the reinforcing plate (30) is connected with the inner side area (13b); when the liquid cooling plate is bolted and connected with the box body (200) at the mounting area (K2), the reinforcing plate (30) is connected with the edge area (13a).

9. The battery pack of claim 1, wherein, In the width direction of the edge flow channel (11), the projection size w1 of the part of the bottom wall (m1) of the edge flow channel (11) covered by the reinforcing plate (30) in the horizontal plane and the projection size w2 of the edge flow channel (11) in the horizontal plane satisfy: 1 / 2≤w1 / w2≤2 / 3.

10. A battery, characterized by The battery box comprises a battery monomer and a heat exchange plate (20) as claimed in claim 9, and the battery monomer is in heat conduction connection with the heat exchange plate (20) of the heat exchange area (K1).

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