Battery box body and battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery box body and a battery pack, the structural strength of the frame corners of the battery box body is high, so that the connecting seams of the frame corners are not easy to crack, the overall reliability of the battery box body is better, and the battery box body can meet the use requirements. The battery box body comprises a frame and a reinforcing piece, at least one corner part of the frame comprises a first surface, a second surface and a third surface which are connected in sequence, at least one of the first surface, the second surface and the third surface is provided with a connecting seam, and the reinforcing piece wraps at least part of the outer surfaces of the first surface, the second surface and the third surface.

Description

Technical Field

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

[0002] With the continuous development of new energy technologies, new energy batteries, as an environmentally friendly energy storage and release device, have been widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, as well as in many technical fields such as power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0003] The battery casing is a crucial structural component of the battery pack, and its structural strength directly affects the reliability and safety of the battery pack. Most existing battery casings are formed from sheet metal through welding and stamping. The corners of the battery casing have welds, which have low connection strength. Furthermore, due to the significant weight of the battery pack itself, these welds at the lower corners are prone to cracking, affecting the overall structural strength of the battery casing and causing it to fail to meet usage requirements. Utility Model Content

[0004] In view of this, the present invention provides a battery box and battery pack to solve the problem that the welds at the corners of existing battery boxes are prone to cracking, which affects the structural strength of the battery box.

[0005] In a first aspect, the present invention provides a battery box body, including a frame and a reinforcing member. At least one corner of the frame includes a first surface, a second surface and a third surface connected in sequence. A connecting seam is provided on at least one of the first surface, the second surface and the third surface. The reinforcing member covers at least a portion of the outer surface of the first surface, the second surface and the third surface.

[0006] Beneficial effects: The battery box of this utility model has at least one corner of its frame including a first surface, a second surface and a third surface connected in sequence, and at least one of the first surface, the second surface and the third surface is provided with a connecting seam. The connection strength at the connecting seam is low. By covering at least part of the outer surface of the first surface, the second surface and the third surface with a reinforcing member, the reinforcing member covers the outside of at least part of the connecting seam, so as to effectively reinforce the connecting seam position, making the connecting seam at the corner of the frame less prone to cracking, thereby enhancing the structural strength of the corner of the frame, and thus enhancing the overall structural strength of the battery box, so that the battery box can meet the usage requirements of the battery pack.

[0007] Moreover, the reinforcing member is provided on at least part of the outer surface of the first, second and third sides, that is, the reinforcing member is provided on the outer wall of the battery box frame, which will not occupy the internal space of the battery box and will not affect the layout of other structures inside the battery box.

[0008] Secondly, the present invention also includes a battery pack, comprising the aforementioned battery housing.

[0009] Since the battery pack of this utility model includes the battery box of this utility model and has the same beneficial effects as the battery box, it will not be described again here. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall structure of the battery box of this utility model. Figure 1 ;

[0012] Figure 2 This is a schematic diagram of the overall structure of the battery box of this utility model. Figure 2 ;

[0013] Figure 3 This is a top view of the battery box body (partial structure hidden) of this utility model;

[0014] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0015] Figure 5 This is a three-dimensional schematic diagram of the reinforcing member in the battery box of this utility model;

[0016] Figure 6 This is a top view of the reinforcing member in the battery box of this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Frame; 101. First side; 102. Second side; 103. Third side; 104. Connecting seam; 105. Hollowed-out structure;

[0019] 2. Reinforcing component; 201. Corner of reinforcing component; 202. First surface of reinforcing component; 203. Second surface of reinforcing component; 204. Third surface of reinforcing component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Currently, to improve the structural strength of the corners of battery boxes, reinforced structures (such as reinforcing ribs or plates) are usually installed inside the battery box and near the corners. These reinforced structures inside the battery box inevitably occupy the internal space of the battery box, which is limited. The installation of the reinforced structure will affect the installation and layout of other structural components inside the battery box, thus affecting the utilization rate of the internal space. On the other hand, if the size of the internal space of the battery box is increased in order to install the reinforced structure, it will result in an excessively large battery box, which will affect the application and installation of the battery pack and fail to meet the usage requirements.

[0022] Based on this, the present invention provides a battery box and battery pack with high frame corner structure strength, weld seam not easy to crack and does not occupy the internal space of the battery box.

[0023] The following is combined Figures 1 to 6 This describes embodiments of the battery box and battery pack of this utility model.

[0024] According to an embodiment of the present invention, a battery housing is provided, including a frame 1 and a reinforcing member 2. At least one corner of the frame 1 includes a first surface 101, a second surface 102 and a third surface 103 connected in sequence. A connecting seam 104 is provided on at least one of the first surface 101, the second surface 102 and the third surface 103. The reinforcing member 2 covers at least a portion of the outer surface of the first surface 101, the second surface 102 and the third surface 103.

[0025] This battery box has a corner of its frame 1 consisting of a first surface 101, a second surface 102, and a third surface 103 connected in sequence. At least one of these surfaces has a connecting seam 104. The connection strength at the connecting seam 104 is relatively low. By covering at least a portion of the outer surface of the first surface 101, the second surface 102, and the third surface 103 with a reinforcing member 2, the connecting seam 104 is effectively reinforced. This prevents the connecting seam 104 at the corner of the frame 1 from cracking, thereby enhancing the structural strength of the corner of the frame 1 and ultimately strengthening the overall structural strength of the battery box, enabling it to meet the usage requirements of the battery pack. Furthermore, since the reinforcing member 2 is located on at least a portion of the outer surface of the first surface 101, the second surface 102, and the third surface 103—that is, on the outer wall of the battery box frame 1—it does not occupy the internal space of the battery box, does not affect the layout of other internal structures, and does not affect the overall size of the battery box.

[0026] The battery housing is one of the key structural components of a battery pack, primarily used to house and support the battery modules and electrical components. The structural strength of the battery housing directly affects the reliability and safety of the battery pack. For example... Figures 1-2 As shown, in this embodiment, the battery box has a cuboid-like structure, and the specific structural shape of the battery box is adapted to the installation space of its application scenario. The battery box includes a base plate and a frame 1. The frame 1 surrounds the edge of the base plate and forms an accommodating space, in which the battery modules and electrical components of the battery pack are housed.

[0027] The frame 1 of the battery box is the frame structure of the battery box. Since the battery box is a cuboid-shaped structure, the frame 1 has multiple corners. The battery box is formed by welding, stamping, and other methods from metal sheets. Therefore, connecting seams 104 are formed at the corners of the frame 1. In this embodiment, the connecting seams 104 are welds. To ensure the structural strength of each weld, reinforcing members 2 can be provided on the outer wall of each corner of the frame 1. Specifically, the battery box is an irregular cuboid structure, and at least one corner of the frame 1 includes a first surface 101, a second surface 102, and a third surface 103 connected in sequence. Figure 1 , Figure 2 Taking a specific perspective as an example, the first surface 101, the second surface 102, and the third surface 103 are connected sequentially in the horizontal direction. The first surface 101 is adjacent to the second surface 102, and the second surface 102 is adjacent to the third surface 103. The second surface 102 is located between the first surface 101 and the third surface 103. In this embodiment, one corner of the frame 1 includes the first surface 101, the second surface 102, and the third surface 103 connected sequentially.

[0028] In other embodiments, in order to optimize the spatial layout, the corners of the frame 1 may include a first surface 101, a second surface 102, and a third surface 103 connected in sequence, in two, three, or four equal numbers.

[0029] Optionally, the first surface 101, the second surface 102, and the third surface 103 are all flat surfaces to make the appearance of the battery box more regular, facilitate the installation of the battery box, and also facilitate the manufacturing and molding of the battery box. Furthermore, the included angle between any two surfaces of the first surface 101, the second surface 102, and the third surface 103 is not 180°. In this embodiment, the included angle between the first surface 101 and the second surface 102 is an obtuse angle, the included angle between the second surface 102 and the third surface 103 is also an obtuse angle, and the included angle between the first surface 101 and the third surface 103 is 90°, to make the appearance of the battery box more regular and facilitate the installation of the battery pack.

[0030] The connecting seam 104 is disposed on at least one of the first surface 101, the second surface 102, and the third surface 103. This is because stress is concentrated at the junction of adjacent surfaces (such as the junction of the first surface 101 and the second surface 102, or the junction of the second surface 102 and the third surface 103). If the connecting seam 104 is disposed at the junction of adjacent surfaces, the risk of breakage of the connecting seam 104 will be greater. However, in this embodiment, the connecting seam 104 is disposed on at least one of the first surface 101, the second surface 102, and the third surface 103, avoiding the junction of adjacent surfaces, which can reduce the risk of breakage of the connecting seam 104.

[0031] In this embodiment, a connecting seam 104 is provided on the second surface 102. Positioning the connecting seam 104 on the second surface 102, located in the middle (between the first surface 101 and the third surface 103), helps ensure the structural strength of the connecting seam 104 and makes it less prone to cracking. Optionally, the connecting seam 104 extends along the height direction of the frame 1, as shown in the figure. Figure 1 As shown in the z-z' direction.

[0032] In other embodiments, depending on different design needs, a connecting seam 104 may be provided on the first surface 101, or on the third surface 103, or on both the first surface 101 and the second surface 102, or on both the second surface 102 and the third surface 103, or on both the first surface 101 and the third surface 103, or on the first surface 101, the second surface 102 and the third surface 103, etc.

[0033] The structural form of the reinforcing member 2 matches the included angle and outer surface form of the first surface 101, the second surface 102 and the third surface 103. The reinforcing member 2 simultaneously covers at least part of the outer surface of the first surface 101, the second surface 102 and the third surface 103. Since the connecting seam 104 is provided on at least one of the first surface 101, the second surface 102 and the third surface 103, the reinforcing member 2 covers at least part of the outside of the connecting seam 104 to reliably reinforce the connecting seam 104, making the connecting seam 104 less prone to cracking, enhancing the structural strength of the corner of the frame 1, and thus enhancing the overall structural strength of the battery box.

[0034] In this embodiment, the reinforcing member 2 is formed by bending a plate-like structure. It can be understood that the reinforcing member 2 covers at least a portion of the outer surfaces of the first surface 101, the second surface 102, and the third surface 103. That is, the inner side of the reinforcing member 2 (the side of the reinforcing member 2 facing the first surface 101, the second surface 102, and the third surface 103) is fitted with at least a portion of the outer surfaces of the first surface 101, the second surface 102, and the third surface 103. Similarly, the inner side of the reinforcing member 2 is also fitted with at least a portion of the outside of the connecting seam 104, so that the reinforcing force of the reinforcing member 2 acts directly on the connecting seam 104, thereby achieving reliable reinforcement of the connecting seam 104.

[0035] Furthermore, at least one of the first surface 101, the second surface 102, and the third surface 103 is connected to the reinforcing member 2 via a connecting layer.

[0036] To enhance the connection between the reinforcing member 2 and the first surface 101, and / or the second surface 102, and / or the third surface 103, at least one of the first surface 101, the second surface 102, and the third surface 103 is connected to the reinforcing member 2 via a connecting layer. That is, a connecting layer can be provided between the reinforcing member 2 and at least a portion of the outer surface of the first surface 101, and / or between the reinforcing member 2 and at least a portion of the outer surface of the second surface 102, and / or between the reinforcing member 2 and at least a portion of the outer surface of the third surface 103. The connecting layer can be made of structural adhesive, which is a low-cost material that helps control the overall manufacturing cost of the battery casing.

[0037] In this embodiment, the second surface 102 is connected to the reinforcing member 2 through a connecting layer. The connecting layer is provided between the reinforcing member 2 and at least a portion of the outer surface of the second surface 102 to save on the use of connecting layer material and further control product costs.

[0038] Of course, in other embodiments, depending on the specific design requirements of different battery boxes, the connecting layer may be provided only between the reinforcing member 2 and at least a portion of the outer surface of the first surface 101, only between the reinforcing member 2 and at least a portion of the outer surface of the third surface 103, between the reinforcing member 2 and at least a portion of the outer surface of the first surface 101 and the second surface 102, between the reinforcing member 2 and at least a portion of the outer surface of the second surface 102 and the third surface 103, or between the reinforcing member 2 and at least a portion of the outer surface of the first surface 101, the second surface 102, and the third surface 103.

[0039] Furthermore, the second surface 102 is connected to the reinforcing member 2 through a connecting layer. The second surface 102 has a hollow structure 105. The outer side of the connecting layer is connected to the reinforcing member 2, and the inner side is connected to the inner wall of the hollow structure 105.

[0040] like Figures 3-4 As shown, in this embodiment, the reinforcing member 2 includes three surfaces: a first reinforcing surface 202, a second reinforcing surface 203, and a third reinforcing surface 204. The first reinforcing surface 202 covers at least a portion of the outer surface of the first surface 101, the second reinforcing surface 203 covers at least a portion of the outer surface of the second surface 102, and the third reinforcing surface 204 covers at least a portion of the outer surface of the third surface 103. This three-surfaced reinforcing member 2 provides a stronger connection to the corner of the frame 1, effectively reducing stress concentration at the corners of the frame 1.

[0041] Furthermore, in this embodiment, the battery housing is disposed within a limited space, such as in a car chassis. To save space and avoid other structures, a portion of the original corner of the battery housing (formed by the intersection of the first surface 101 and the third surface 103 before cutting) is cut off, creating a second surface 102 between the first surface 101 and the third surface 103. In other words, the second surface 102 is the surface formed after cutting. To reduce the weight of the battery housing, the interior of the frame 1 is a cavity (or molded cavity). After cutting, a portion of the internal cavity is exposed at the second surface 102, forming a hollow structure 105.

[0042] The second surface 102 is connected to the reinforcing member 2 via a connecting layer. The outer side of the connecting layer is connected to the reinforcing member 2, and the inner side of the connecting layer is connected to the inner wall of the hollow structure 105. The connecting layer not only improves the connection strength between the reinforcing member 2 and the second surface 102, but also seals the hollow structure 105. The reinforcing member 2 not only strengthens the structural strength of the corners of the frame 1, but also further seals the hollow structure 105, preventing the cavity structure of the frame 1 from being exposed to the outside and preventing external impurities, moisture, etc. from entering the interior of the frame 1 through the hollow structure 105, which would affect the structural strength of the battery box and the safe operation of the battery pack. Moreover, the connection between the inner side of the connecting layer and the inner wall of the hollow structure 105 enhances the connection force between the connecting layer and the hollow structure 105, further improving the reliability of the structure.

[0043] Before installing the reinforcing member 2, a connecting layer is first covered on the outside of the hollow structure 105. The connecting layer can seal the hollow structure 105. Then, the reinforcing member 2 is wrapped on the outside of the connecting layer. On the one hand, it can enhance the connection between the reinforcing member 2 and the second surface 102. On the other hand, it can further seal the hollow structure 105, ensuring that the cavity structure of the frame 1 will not be exposed to the outside, and ensuring that external impurities, moisture and other substances will not enter the interior of the frame 1.

[0044] In this embodiment, the battery box is a cuboid-shaped structure. The first surface 101 is the smaller side surface of the battery box (or the small surface of the battery box), the third surface 103 is the larger side surface of the battery box (or the large surface of the battery box), the second surface 102 is a plane formed after the original corner is cut, and a connecting seam 104 is provided on the second surface 102.

[0045] In this embodiment, the reinforcing member 2 covers a portion of the outer surface of the first surface 101, most of the outer surface of the second surface 102, and a portion of the outer surface of the third surface 103. Furthermore, the reinforcing member 2 covers most of the exterior of the connecting seam 104, which not only enhances the structural strength of the corner of the frame 1, making the connecting seam 104 less prone to cracking, but also reliably seals the hollow structure 105 located on the second surface 102, preventing the cavity structure of the frame 1 from being exposed to the outside, so that external impurities, moisture, etc. will not enter the interior of the frame 1 through the hollow structure 105, thereby ensuring the safe operation of the battery pack.

[0046] Furthermore, the connecting seam 104 is provided along the height direction of the frame 1, the upper end face of the reinforcing member 2 is lower than the upper end of the connecting seam 104, and / or the lower end face of the reinforcing member 2 is higher than the lower end of the connecting seam 104.

[0047] The connecting seam 104 is set along the height direction of the frame 1, as shown in the figure below. Figure 1As shown in the z-z' direction, since the connecting seam 104 is a weld, the strength at the beginning and end of the weld is relatively weak during the welding process. Furthermore, in this embodiment, the reinforcing member 2 is made of metal to ensure its structural strength. The reinforcing member 2 is welded to the outer surfaces of the first surface 101, the second surface 102, and the third surface 103. To ensure the connection between the reinforcing member 2 and the outer surfaces of the first surface 101, the second surface 102, and the third surface 103, the weld mark is set around the outer contour of the reinforcing member 2. By making the upper end face of the reinforcing member 2 lower than the upper end of the connecting seam 104, and / or the lower end face of the reinforcing member 2 higher than the lower end of the connecting seam 104, the weld mark of the reinforcing member 2 can avoid the beginning and / or end of the weld, ensuring the strength of the reinforcing member 2 and preventing the high welding temperature during welding from affecting the strength at the beginning and end of the connecting seam 104, thus making the connecting seam 104 more prone to cracking.

[0048] In this embodiment, the upper end face of the reinforcing member 2 is lower than the upper end of the connecting seam 104, and the lower end face of the reinforcing member 2 is higher than the lower end of the connecting seam 104. This structural arrangement also allows the weld mark on the upper end face of the reinforcing member 2 to be below the upper end face of the corner of the frame 1, and the weld mark on the lower end face of the reinforcing member 2 to be above the lower end face of the corner of the frame 1. During the welding process between the reinforcing member 2 and the outer surfaces of the first surface 101, the second surface 102, and the third surface 103, the weld mark of the reinforcing member 2 will not protrude upwards or downwards from the upper and lower surfaces of the frame 1. Figure 1 Taking the perspective as an example, the upper surface of the reinforcing member 2 is lower than the upper surface of the corner of the frame. The upper surface of the reinforcing member 2 and the upper surface of the corner of the frame 1 form a stepped structure. The lower surface of the reinforcing member 2 is higher than the lower surface of the corner of the frame. The lower surface of the reinforcing member 2 and the lower surface of the corner of the frame 1 also form a stepped structure. This design allows the solder to be formed on the upper surface of the reinforcing member 2 without protruding upwards from the upper surface of the corner. Similarly, the solder can be formed on the lower surface of the reinforcing member 2 without protruding downwards from the lower surface of the corner. Overall, the solder of the reinforcing member 2 will not protrude upwards or downwards from the upper and lower surfaces of the frame 1, thus making the appearance of the battery box more regular and optimizing the product appearance.

[0049] In other embodiments, depending on different configuration requirements, the upper end face of the reinforcing member 2 may be lower than the upper end of the connecting seam 104, or the lower end face of the reinforcing member 2 may be higher than the lower end of the connecting seam 104.

[0050] Furthermore, the distance between the upper end face of the reinforcing member 2 and the upper end face of the connecting seam 104 is 2mm-10mm, and the distance between the lower end face of the reinforcing member 2 and the lower end face of the connecting seam 104 is 2mm-10mm.

[0051] The distance between the upper end of the reinforcing member 2 and the upper end of the connecting seam 104, and the distance between the lower end of the reinforcing member 2 and the lower end of the connecting seam 104, should not be too large or too small. If it is too large, it will affect the area covered by the reinforcing member 2 on the first surface 101, the second surface 102, and the third surface 103, thus affecting the strength of the reinforcing member 2 and consequently the reinforcement effect of the reinforcing member 2 on the connecting seam 104. If it is too small, the upper end of the reinforcing member 2 will be close to the starting end of the connecting seam 104, or the lower end of the reinforcing member 2 will be close to the ending end of the connecting seam 104, affecting the connection strength of the connecting seam 104 and the strength of the reinforcing member 2.

[0052] The distance between the upper surface of the reinforcing member 2 and the upper surface of the connecting seam 104 is 2mm-10mm, and the distance between the lower surface of the reinforcing member 2 and the lower surface of the connecting seam 104 is 2mm-10mm. Within the above range, the distance between the upper surface of the reinforcing member 2 and the upper surface of the connecting seam 104 is neither too large nor too small, which ensures the strength of the reinforcing member 2 without affecting the connection strength of the connecting seam 104, making the connecting seam 104 less prone to cracking.

[0053] For example, the distance between the upper end face of the reinforcing member 2 and the upper end face of the connecting seam 104 can be 2mm, 2.5mm, 3mm, 4.6mm, 5mm, 6mm, 7.2mm, 8.5mm, 9mm, 10mm, etc., and the distance between the lower end face of the reinforcing member 2 and the lower end face of the connecting seam 104 can be 2mm, 3mm, 3.5mm, 4mm, 5.8mm, 6mm, 7mm, 8.2mm, 9.5mm, 10mm, etc.

[0054] Furthermore, since the height of the frame 1 varies depending on the model of the battery box, the distance between the upper end of the reinforcing member 2 and the upper end of the connecting seam 104 is 2mm-10mm, and the distance between the lower end of the reinforcing member 2 and the lower end of the connecting seam 104 is 2mm-10mm, the dimension of the reinforcing member 2 along the height direction of the frame (the height of the reinforcing member 2) will not be too small, thereby ensuring the connection strength between the reinforcing member 2 and the outer wall of the frame.

[0055] Furthermore, the reinforcing member 2 has a reinforcing member corner portion 201, which is provided at the junction of the first surface 101 and the second surface 102, and / or at the junction of the second surface 102 and the third surface 103. The thickness of the reinforcing member corner portion 201 is greater than the thickness of other parts of the reinforcing member 2.

[0056] In order to fit the first surface 101, the second surface 102 and the third surface 103, the reinforcing member 2 has a reinforcing corner portion 201 at the junction of the first surface 101 and the second surface 102, and at the junction of the second surface 102 and the third surface 103. The reinforcing corner portion 201 is provided at the junction of adjacent surfaces.

[0057] Furthermore, to further enhance the structural strength of the corner of the frame 1 and ensure the connection strength of the connecting seam 104, preventing the connecting seam 104 from cracking, the thickness of the corner 201 of the reinforcing member is greater than the thickness of other parts of the reinforcing member 2. For example... Figure 6 As shown, by thickening the corner portion 201 of the reinforcing member, the structural strength and torsional stiffness of the corner portion 201 can be enhanced, and the impact resistance of the corner portion 201 can be improved, thereby improving the structural reliability of the reinforcing member 2 and ensuring the reinforcement effect of the reinforcing member 2 on the connecting seam 104.

[0058] In other embodiments, the corner portion 201 of the reinforcing member can be provided at the junction of the first surface 101 and the second surface 102, or the corner portion 201 of the reinforcing member can be provided at the junction of the second surface 102 and the third surface 103, which can also improve the structural strength of the reinforcing member 2 and simplify the molding difficulty of the reinforcing member 2.

[0059] Furthermore, the thickness of the corner portion 201 of the reinforcing member is d1, and the thickness of the other parts of the reinforcing member 2 is d2. The relationship between the thicknesses d1 and d2 satisfies: d1 / d2≥1.2.

[0060] The reinforcing member 2 is formed by bending a plate-like structure. Except for the corner 201, the thickness of the other parts of the reinforcing member 2 is uniform. In this embodiment, the thickness of the corner 201 is d1, and the thickness of the other parts of the reinforcing member 2 is d2. In this embodiment, the relationship between thickness d1 and thickness d2 satisfies: d1 / d2≥1.2.

[0061] The ratio of thickness d1 to thickness d2 should not be too small; otherwise, the thickness of the corner 201 of the reinforcing member will be too small, failing to effectively enhance the structural strength and torsional stiffness of the corner 201. In this case, the reinforcement effect on the connecting seam 104 will be slightly weaker. When the ratio of thickness d1 to thickness d2 meets the above range, it can effectively enhance the structural strength and torsional stiffness of the corner 201 of the reinforcing member, achieving reliable reinforcement of the connecting seam 104.

[0062] For example, the ratio of d1 to d2 is 1.2, 1.3, 1.4, 1.5, 1.6, etc.

[0063] Furthermore, the reinforcing member 2 has a reinforcing member corner portion 201, which is provided at the junction of the first surface 101 and the second surface 102, and / or at the junction of the second surface 102 and the third surface 103. The outer surface of the reinforcing member corner portion 201 is an outwardly protruding arc-shaped structure.

[0064] In order to fit the first surface 101, the second surface 102 and the third surface 103, the reinforcing member 2 has a reinforcing corner portion 201 at the junction of the first surface 101 and the second surface 102, and at the junction of the second surface 102 and the third surface 103. The reinforcing corner portion 201 is provided at the junction of adjacent surfaces.

[0065] To further enhance the structural strength of the corner of the frame 1 and ensure the connection strength of the connecting seam 104, preventing the connecting seam 104 from cracking, the outer surface of the corner 201 of the reinforcing member has an outwardly convex arc-shaped structure (using a rounded corner design), such as... Figures 5-6 As shown. The corner 201 of this structure can reduce stress concentration and enhance the impact resistance of the reinforcement 2. When the battery box is subjected to external impact, the corner 201 of the reinforcement is not easily deformed by the external force, which further improves the reliability of the battery box structure and the reinforcement effect on the connection seam 104.

[0066] In this embodiment, the corner reinforcement 201 is not only thickened, but its outer surface is also an outwardly convex arc-shaped structure, which optimizes the structural strength and impact resistance of the corner reinforcement 201, significantly improves the service life of the battery box, ensures the safety of the battery pack, and meets the needs of different application scenarios of the battery pack.

[0067] Of course, in other embodiments, the reinforcing corner 201 of the reinforcing member 2 may only increase the thickness, or the outer surface of the reinforcing corner 201 may only be an outwardly protruding arc structure, which can also enhance the structural strength and impact resistance of the reinforcing corner 201 to a certain extent, while taking into account factors such as processing difficulty and processing cost.

[0068] In other embodiments, the corner portion 201 of the reinforcing member can be provided at the junction of the first surface 101 and the second surface 102, or the corner portion 201 of the reinforcing member can be provided at the junction of the second surface 102 and the third surface 103, which can also improve the structural strength of the reinforcing member 2 and simplify the molding difficulty of the reinforcing member 2.

[0069] In this embodiment, the reinforcing member 2 covers part of the outer surface of the first surface 101, most of the outer surface of the second surface 102, and part of the outer surface of the third surface 103. It is understood that the area covered by the reinforcing member 2 on the first surface 101, the area covered by the reinforcing member 2 on the second surface 102, and the area covered by the reinforcing member 2 on the third surface 103 should not be too large or too small. If the area covered by the reinforcing member 2 on the outer surface of the first surface 101 is too small, the connection force between the reinforcing member 2 and the first surface 101 will be insufficient, and the joint 104 will not be effectively reinforced. If the area covered by the reinforcing member 2 on the outer surface of the first surface 101 is too large, the overall size of the reinforcing member 2 will be too large, increasing the manufacturing cost and setting cost of the reinforcing member 2, resulting in a waste of production costs. Similarly, if the area of ​​the reinforcing member 2 covering the outer surface of the second surface 102 is too small, the connection force between the reinforcing member 2 and the second surface 102 will be insufficient, and the joint 104 will not be effectively reinforced. Conversely, if the area of ​​the reinforcing member 2 covering the outer surface of the second surface 102 is too large, the overall size of the reinforcing member 2 will be too large, increasing the manufacturing and installation costs of the reinforcing member 2 and resulting in wasted production costs. Likewise, if the area of ​​the reinforcing member 2 covering the outer surface of the third surface 103 is too small, the connection force between the reinforcing member 2 and the third surface 103 will be insufficient, and the joint 104 will not be effectively reinforced. Conversely, if the area of ​​the reinforcing member 2 covering the outer surface of the third surface 103 is too large, the overall size of the reinforcing member 2 will be too large, increasing the manufacturing and installation costs of the reinforcing member 2 and resulting in wasted production costs.

[0070] In this embodiment, the first surface 202 of the reinforcing member covers the first surface 101, the second surface 203 of the reinforcing member covers the second surface 102, and the third surface 204 of the reinforcing member covers the third surface 103. Therefore, the area of ​​the outer surface of the first surface 101 covered by the reinforcing member 2 is the area of ​​the first surface 202 of the reinforcing member, the area of ​​the outer surface of the second surface 102 covered by the reinforcing member 2 is the area of ​​the second surface 203 of the reinforcing member, and the area of ​​the outer surface of the third surface 103 covered by the reinforcing member 2 is the area of ​​the third surface 204 of the reinforcing member.

[0071] Furthermore, the length of the reinforcing member 2 extending in the horizontal direction of the first surface 101 is a, where a ≥ 5 mm.

[0072] like Figure 6 As shown, the first surface 202 of the reinforcing member covers the first surface 101. In the horizontal direction, the length of the first surface 202 of the reinforcing member is a, and a≥5mm.

[0073] If the length 'a' of the reinforcing member 2 extending horizontally in the first surface 101 is too small, the connection strength between the reinforcing member 2 and the first surface 101 will be insufficient, which will affect the installation strength of the reinforcing member 2 and the reinforcement effect of the reinforcing member 2 on the connecting seam 104. In this embodiment, the length 'a' of the reinforcing member extending horizontally in the first surface 202 is ≥ 5mm. Within the above range, the connection strength between the reinforcing member 2 and the first surface 101 can be ensured, thereby ensuring the installation strength of the reinforcing member 2 and making the reinforcement effect of the reinforcing member 2 on the connecting seam 104 better.

[0074] Moreover, in this embodiment, the first surface 202, the second surface 203, and the third surface 204 of the reinforcing member are all rectangular planes. Under the premise that the distance between the upper surface of the reinforcing member 2 and the upper surface of the connecting seam 104 is 2mm-10mm, and the distance between the lower surface of the reinforcing member 2 and the lower surface of the connecting seam 104 is 2mm-10mm, the length a of the reinforcing member 2 extending horizontally in the first surface 101 is ≥5mm, so that the connection area between the reinforcing member 2 and the first surface is not too small, further ensuring the reinforcement effect of the reinforcing member 2 on the connecting seam 104.

[0075] For example, the length 'a' of the reinforcing member 2 extending in the horizontal direction of the first surface 101 can be 5mm, 6mm, 8.5mm, 10mm, etc.

[0076] Preferably, the length a of the reinforcing member 2 extending in the horizontal direction of the first surface 101 is ≥7mm. For example, the length a of the reinforcing member 2 extending in the horizontal direction of the first surface 101 can be 7mm, 7.5mm, 8mm, 12mm, etc.

[0077] Furthermore, the length of the reinforcing member 2 extending in the horizontal direction of the second surface 102 is b, b≥10mm; the length of the reinforcing member 2 extending in the horizontal direction of the third surface 103 is c, c≥7mm.

[0078] like Figure 6 As shown, the second surface 203 of the reinforcing member covers the second surface 102. In the horizontal direction, the length of the second surface 203 of the reinforcing member is b, and b ≥ 10 mm. Since the second surface 102 is located between the first surface 101 and the third surface 103, the reinforcing member 2 completely covers the length of the second surface 102 in the horizontal direction.

[0079] Moreover, in this embodiment, the first surface 202, the second surface 203, and the third surface 204 of the reinforcing member are all rectangular planes. Under the premise that the distance between the upper surface of the reinforcing member 2 and the upper surface of the connecting seam 104 is 2mm-10mm, and the distance between the lower surface of the reinforcing member 2 and the lower surface of the connecting seam 104 is 2mm-10mm, the length b of the horizontal extension of the reinforcing member 2 on the second surface 102 is ≥10mm, so that the connection area between the reinforcing member 2 and the second surface 102 is not too small, further ensuring the reinforcement effect of the reinforcing member 2 on the connecting seam 104.

[0080] The horizontal dimension of the second surface 102 depends on the strength requirements of the reinforcing member 2 and the clearance requirements for its installation space. In this embodiment, the length b of the reinforcing member 2 extending horizontally on the second surface 102 can be 10mm, 11mm, 12mm, 15mm, etc.

[0081] like Figure 6 As shown, the third surface 204 of the reinforcing member covers the third surface 103. In the horizontal direction, the length of the third surface 204 of the reinforcing member is c, and c ≥ 7 mm.

[0082] If the length c of the horizontal extension of the reinforcing member 2 on the third surface 103 is too small, the connection strength between the reinforcing member 2 and the third surface 103 will be insufficient, which will affect the installation strength of the reinforcing member 2 and the reinforcement effect of the reinforcing member 2 on the connecting seam 104. In this embodiment, the horizontal extension length c of the reinforcing member on the third surface 204 is ≥7mm. Within the above range, the connection strength between the reinforcing member 2 and the third surface 103 can be ensured, thereby ensuring the installation strength of the reinforcing member 2 and making the reinforcement effect of the reinforcing member 2 on the connecting seam 104 better.

[0083] Moreover, in this embodiment, the first surface 202, the second surface 203, and the third surface 204 of the reinforcing member are all rectangular planes. Under the premise that the distance between the upper surface of the reinforcing member 2 and the upper surface of the connecting seam 104 is 2mm-10mm, and the distance between the lower surface of the reinforcing member 2 and the lower surface of the connecting seam 104 is 2mm-10mm, the length c of the reinforcing member 2 extending horizontally in the third surface 10 is ≥7mm. This ensures that the connection area between the reinforcing member 2 and the third surface 103 is not too small, further ensuring the reinforcement effect of the reinforcing member 2 on the connecting seam 104.

[0084] For example, the length c of the reinforcement 2 extending in the horizontal direction of the third surface 103 can be 7mm, 7.8mm, 9mm, 12mm, etc.

[0085] This embodiment also provides a battery pack, including the battery housing described in the above embodiment.

[0086] like Figures 1-2As shown, the battery housing is one of the important structural components of the battery pack, mainly used to house and support the battery modules and electrical components. The structural strength of the battery housing directly affects the reliability and safety of the battery pack. The battery housing includes a base plate and a frame 1. The frame 1 surrounds the edge of the base plate and forms a receiving space, within which the battery modules and electrical components of the battery pack are housed. Of course, the battery pack of this embodiment also has the structures and components common to existing battery packs, which will not be elaborated here.

[0087] The battery pack of this embodiment has the battery box of this embodiment. The corner of the battery box frame has high structural strength and good impact resistance. The connection force of the connecting seam 104 is strong and not easy to crack, so that the battery box has high overall structural strength and longer service life, which can meet the different usage needs of the battery pack.

[0088] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery case characterized by comprising: The battery box comprises a frame (1) and a reinforcing member (2), at least one corner of the frame (1) comprises a first face (101), a second face (102) and a third face (103) connected in sequence, at least one of the first face (101), the second face (102) and the third face (103) is provided with a connecting seam (104), and the reinforcing member (2) covers at least part of the outer surface of the first face (101), the second face (102) and the third face (103).

2. The battery pack of claim 1, wherein, At least one of the first face (101), the second face (102) and the third face (103) connects the reinforcing member (2) through a connecting layer.

3. The battery pack of claim 2, wherein, The second face (102) connects the reinforcing member (2) through a connecting layer, the second face (102) has a hollow structure (105), the connecting layer connects the reinforcing member (2) on the outside and connects the inner wall of the hollow structure (105) on the inside.

4. The battery pack of claim 1, wherein, The connecting seam (104) is arranged along the height direction of the frame (1), the upper end surface of the reinforcing member (2) is lower than the upper end of the connecting seam (104), and / or the lower end surface of the reinforcing member (2) is higher than the lower end of the connecting seam (104).

5. The battery pack of claim 4, wherein, The distance between the upper end surface of the reinforcing member (2) and the upper end of the connecting seam (104) is 2-10 mm, and the distance between the lower end surface of the reinforcing member (2) and the lower end of the connecting seam (104) is 2-10 mm.

6. The battery pack of claim 1, wherein, The connecting seam (104) is arranged on the second face (102).

7. The battery pack of claim 1, wherein, The reinforcing member (2) has a reinforcing member corner (201) arranged corresponding to the intersection of the first face (101) and the second face (102) and / or arranged corresponding to the intersection of the second face (102) and the third face (103), and the thickness of the reinforcing member corner (201) is greater than the thickness of other parts of the reinforcing member (2).

8. The battery pack of claim 7, wherein, The thickness of the reinforcing member corner (201) is d1, the thickness of other parts of the reinforcing member (2) is d2, and the relationship between the thickness d1 and the thickness d2 satisfies d1 / d2≥1.

2.

9. The battery pack of claim 1, wherein, The reinforcing member (2) has a reinforcing member corner (201) arranged corresponding to the intersection of the first face (101) and the second face (102) and / or arranged corresponding to the intersection of the second face (102) and the third face (103), and the outer surface of the reinforcing member corner (201) is an outwardly convex arc structure.

10. The battery pack of any one of claims 1-9, wherein, The length of the reinforcing member (2) extending in the horizontal direction of the first face (101) is a, and a≥5 mm.

11. The battery pack of claim 10, wherein, The length of the reinforcing member (2) extending in the horizontal direction of the second face (102) is b, and b≥10 mm; the length of the reinforcing member (2) extending in the horizontal direction of the third face (103) is c, and c≥7 mm.

12. A battery pack, characterized by, The battery box comprises the battery box as claimed in any one of claims 1-11.

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