Battery case, battery cell, and battery device

Abstract

The utility model discloses a battery shell, battery monomer and battery device, the battery shell includes: the casing, the casing extends along the first direction, the insulating layer includes insulating body and a plurality of protruding, the insulating body is wrapped on the outer peripheral surface of casing along the first direction extension, a plurality of protruding interval arrangement is on the insulating body, and the protruding is from the outer peripheral surface of insulating body's one side surface of the casing. According to the battery shell of the utility model, through setting up a plurality of protruding on the insulating layer, a plurality of protruding can enhance the adhesion between adjacent battery monomer, promote the adhesion stability and reliability between battery monomer, avoid battery monomer to produce the shaking, avoid battery device to produce the vibration abnormal sound, promote the reliability and service life of battery device.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing, a battery cell, and a battery device. Background Technology

[0002] In the field of battery technology, the battery cell, as the core energy unit of the battery pack, requires insulation treatment on its outer surface as a crucial process to ensure the electrical safety and structural stability of the battery device. Currently, the industry commonly uses UV paint spraying and curing technology to achieve external insulation of the battery cell. During the battery pack assembly stage, to achieve a stable connection between battery cells, they are usually fixed together by applying adhesive. However, the insulating coating formed after UV paint curing has a smooth surface and low surface energy, resulting in poor wetting effect between the adhesive and the coating surface. The adhesion between the two is significantly insufficient, which can easily lead to problems such as adhesive layer peeling and relative displacement between battery cells. This can cause vibration and abnormal noise during battery pack use, and in severe cases, even affect the overall structural reliability of the battery pack. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a battery casing that enhances the adhesion between adjacent battery cells, thereby improving the adhesion stability and reliability between the battery cells.

[0004] This utility model also proposes a battery cell having the above-mentioned battery casing.

[0005] This utility model also proposes a battery device having the above-mentioned battery cells.

[0006] According to a first aspect of the present invention, a battery casing includes: a housing extending along a first direction; an insulating layer including an insulating body and a plurality of protrusions, the insulating body wrapping around the outer peripheral surface of the housing extending along the first direction, and the plurality of protrusions being spaced apart on the insulating body and protruding from the side surface of the insulating body opposite to the outer peripheral surface of the housing.

[0007] According to the present invention, the battery casing has multiple protrusions on the insulating layer. These protrusions can enhance the adhesion between adjacent battery cells, improve the adhesion stability and reliability between battery cells, prevent battery cells from shaking, prevent the battery device from vibrating and making abnormal noises, and improve the reliability and service life of the battery device.

[0008] According to some embodiments of the present invention, in the thickness direction of the insulating layer, the height of the protrusion protruding from the side surface of the insulating body is 0.03mm-0.5mm; and / or, the minimum distance between the protrusion and the end face of the housing in the first direction is a first distance, and the first distance is greater than or equal to one-tenth of the total height of the housing in the first direction.

[0009] According to some embodiments of the present invention, a plurality of protrusions form at least one rib group, each rib group including a plurality of protrusions spaced apart along the circumference of the housing, and the plurality of rib groups spaced apart in the first direction.

[0010] According to some embodiments of the present invention, in the circumferential direction of the housing, the distance between two adjacent protrusions is greater than 3 mm; and / or, in the first direction, the distance between two adjacent rib groups is greater than 3 mm.

[0011] According to some embodiments of the present invention, the protrusion is in the shape of a convex bulge, or the protrusion extends along a straight line, a broken line and / or a curve on the outer peripheral surface of the housing, and extends into a strip or a ring shape.

[0012] According to some embodiments of the present invention, the protrusion extends in a straight line along the first direction as an elongated strip; or, in the direction from one end of the housing in the first direction to the other end, the protrusion first extends obliquely toward one side of the housing in the circumferential direction, and then extends obliquely toward the other side of the housing in the circumferential direction; or, the protrusion is a circular protrusion with a diameter of 1.5mm-15mm.

[0013] According to some embodiments of the present invention, the protrusion extends in an elongated shape along the first direction, wherein, in the first direction, the ratio of the length of the protrusion to the total height of the housing is 0.1-0.8, and / or, the ratio of the length of the protrusion in the first direction to the width of the protrusion in the circumferential direction of the housing is greater than or equal to 3.

[0014] According to some embodiments of the present invention, the housing is cylindrical with its axis extending along the first direction.

[0015] The battery cell according to the second aspect of the present invention includes the battery casing according to the first aspect of the present invention.

[0016] According to the present invention, the overall performance of the battery cell is improved by providing the battery casing described in the first aspect.

[0017] The battery device according to the second aspect of the present invention includes a plurality of battery cells according to the second aspect of the present invention, the plurality of battery cells being arranged sequentially along a second direction and / or a third direction, adjacent battery cells being bonded together, and the first direction, the second direction and the third direction intersecting each other.

[0018] According to the present invention, the battery device improves the overall performance of the battery device by providing the battery cells described in the first aspect.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a battery cell according to Embodiment 1 of this utility model; Figure 2 yes Figure 1 The front view of the battery cell shown; Figure 3 yes Figure 1 A top view of the battery cell shown; Figure 4 It is along Figure 3 Sectional view of line AA in the middle; Figure 5 yes Figure 4 A magnified view of point B, indicated by the center circle; Figure 6 This is a schematic diagram of the structure of a battery cell according to Embodiment 2 of this utility model; Figure 7 yes Figure 6 The front view of the battery cell shown; Figure 8 yes Figure 6 A cross-sectional view of the battery cell shown; Figure 9 yes Figure 8 A magnified view of point C, indicated by the center circle; Figure 10 This is a schematic diagram of the structure of a battery cell according to Embodiment 3 of this utility model; Figure 11 yes Figure 10 The front view of the battery cell shown; Figure 12 yes Figure 10 A cross-sectional view of the battery cell shown; Figure 13 yes Figure 12 A magnified view of point D, indicated by the center circle; Figure 14This is a schematic diagram of the structure of a battery cell according to Embodiment 4 of this utility model; Figure 15 yes Figure 14 The front view of the battery cell shown; Figure 16 yes Figure 14 A cross-sectional view of the battery cell shown; Figure 17 yes Figure 16 A magnified view of point E, indicated by the middle circle.

[0021] Figure label: 100. Battery cell; 10. Battery casing; 11. Housing; 12. Insulating layer; 121. Insulating body; 122. Protrusion; 20. Pole post; 30. Electrode assembly. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] The following is for reference. Figures 1-17 The battery casing 10 according to a first aspect embodiment of the present invention is described.

[0024] like Figures 1-5 As shown, the battery casing 10 according to the first aspect of the present invention includes: a casing 11 and an insulating layer 12.

[0025] Specifically, the housing 11 is along the first direction (e.g. Figure 1 Extending in the vertical direction shown, the insulating layer 12 includes an insulating body 121 and a plurality of protrusions 122. The insulating body 121 wraps around the outer peripheral surface of the housing 11 extending in the first direction. The plurality of protrusions 122 are spaced apart on the insulating body 121 and protrude from the side surface of the insulating body 121 opposite to the outer peripheral surface of the housing 11.

[0026] In some examples, the housing 11 can be a square box shape extending along the first direction, or it can be a cylindrical shape extending along the first direction. The housing 11 can be a metal material, such as an aluminum or stainless steel housing.

[0027] In some examples, the insulating layer 12 is wrapped around the outer surface of the housing 11. The insulating layer 12 may completely cover all outer surfaces of the housing 11, or it may only cover a portion of the outer surface of the housing 11, for example, only the outer peripheral surface of the housing 11. The insulating layer 12 may be an insulating coating that is cured after spraying.

[0028] In some examples, the insulating layer 12 includes an insulating body 121 and a plurality of protrusions 122. The insulating body 121 at least completely covers the outer peripheral surface of the housing 11. The plurality of protrusions 122 are connected to the insulating body 121 and are disposed on the side of the insulating body 121 opposite to the outer peripheral surface of the housing 11. The number of protrusions 122 can be multiple, for example, two, three, five, eight, ten, fifteen, twenty, thirty, forty, or fifty or more. The plurality of protrusions 122 can be arranged at intervals on the outer surface of the insulating body 121.

[0029] In some examples, during the molding of the insulation layer 12, an insulating coating may be sprayed onto the surface of the housing 11 first to cure and form an insulating body 121, and then an insulating coating may be sprayed onto the surface of the insulating body 121 again to cure and form a plurality of protrusions 122.

[0030] This embodiment includes an insulating body 121 covering the outer periphery of the housing 11 and multiple protrusions 122 protruding from the outer surface of the insulating body 121. The multiple protrusions 122 not only increase the local thickness of the insulating layer 12 and improve the insulation protection performance of the housing 11, but also form an uneven structure on the outer periphery of the battery casing 10. When the battery cells 100 are bonded together by an adhesive layer (e.g., structural adhesive), the bonding area between the battery casing 10 and the structural adhesive can be increased. Furthermore, an interlocking adhesive structure can be formed between the outer periphery of the battery cells 100 and the structural adhesive, thereby enhancing the adhesion between the structural adhesive and the outer periphery of the battery casing 10, improving the torsional resistance between the battery cells 100 and the structural adhesive, improving the bonding stability and reliability between the battery cells 100, reducing the risk of structural adhesive layer detachment and relative displacement between the battery cells 100, and thus effectively preventing the battery cells 100 from shaking and generating abnormal vibrations during the operation of the battery device, thereby improving the overall reliability and service life of the battery device.

[0031] According to the embodiment of the present utility model, the battery casing 10 has multiple protrusions 122 on the insulating layer 12. The multiple protrusions 122 can enhance the adhesion between adjacent battery cells 100, improve the adhesion stability and reliability between battery cells 100, prevent the battery cells 100 from shaking, and prevent the battery device from vibrating and making abnormal noises, thereby improving the reliability and service life of the battery device.

[0032] In some embodiments of this utility model, such as Figure 5 , Figure 9 , Figure 13 and Figure 17 As shown, in the thickness direction of the insulating layer 12 (e.g.) Figure 5 In the left-right direction shown, the height 'a' of the protrusion 122 protruding from one side surface of the insulating body 121 is 0.03mm-0.5mm. For example, the height 'a' of the protrusion 122 protruding from the outer surface of the insulating body 121 can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm. In this embodiment, by making the height 'a' of the protrusion 122 protruding from the outer surface of the insulating body 121 greater than or equal to 0.03mm and less than or equal to 0.5mm, it is possible to ensure that the structural adhesive can form an effective interlocking structure with the protrusion 122, thereby improving the adhesion, while avoiding the protrusion 122 occupying too much space, which would affect the space utilization rate inside the battery device and ensure the energy density of the battery device.

[0033] In some embodiments of this utility model, such as Figure 2 , Figure 7 , Figure 11 and Figure 15 As shown, the protrusion 122 and the end face of the housing 11 in the first direction (e.g.) Figure 2 The minimum distance between the upper or lower end face of the housing 11 shown is a first distance L1, which is greater than or equal to one-tenth of the total height L0 of the housing 11 in the first direction. For example, the ratio of the first distance L1 to the total height L0 of the housing 11 can be 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, or 0.35. In this embodiment, by making the minimum distance L1 between the protrusion 122 and the end face of the housing 11 greater than or equal to one-tenth of the total height L0 of the housing 11, interference and collision between the protrusion 122 and the end face of the housing 11 or components such as the terminal post 20 on the end face of the housing 11 can be avoided. In addition, the insulation layer 12 in the two end areas of the housing 11 can be more evenly distributed, avoiding uneven filling of structural adhesive at the two ends of the battery casing 10, thereby ensuring the bonding stability of the battery casing 10 at the two ends, preventing end delamination, and improving the operational stability and reliability of the battery device.

[0034] In some embodiments of this utility model, such as Figure 6 and Figure 7As shown, multiple protrusions 122 are arranged at intervals along the circumference and / or first direction of the housing 11. For example, the multiple protrusions 122 may be arranged at intervals only along the circumference of the housing 11, or they may be arranged at intervals only along the first direction, or they may be arranged at intervals in both the circumference and the first direction of the housing 11. This allows for a more uniform distribution of the multiple protrusions 122 on the outer circumferential surface of the housing 11, resulting in a more uniform distribution of adhesive force between adjacent battery cells 100, avoiding stress concentration, and improving the adhesion stability and reliability of adjacent battery cells 100 in both the circumferential and first directions.

[0035] In some embodiments of this utility model, such as Figure 2 , Figure 7 , Figure 11 and Figure 15 As shown, multiple protrusions 122 form at least one rib group, and each rib group includes multiple protrusions 122 arranged at intervals along the circumference of the housing 11. The multiple rib groups are arranged at intervals in a first direction. For example, only one rib group may be provided on the outer circumferential surface of the housing 11, or two, three, four or more rib groups may be provided on the outer circumferential surface of the housing 11.

[0036] This embodiment, by including multiple protrusions 122 spaced apart in the circumferential direction of the housing 11 in each rib group, makes the distribution of the multiple protrusions 122 in the circumferential direction of the housing 11 more uniform, and makes the adhesive force between adjacent battery cells 100 more uniformly distributed in the circumferential direction of the housing 11, further reducing the risk of stress concentration. By setting multiple rib groups spaced apart along the first direction, the distribution of the multiple protrusions 122 in the first direction is made more uniform, improving the uniformity of the adhesive force distribution in the first direction and reducing the risk of stress concentration.

[0037] In some embodiments of this utility model, such as Figure 2 , Figure 7 , Figure 11 and Figure 15 As shown, in the circumferential direction of the housing 11, the distance L2 between two adjacent protrusions 122 is greater than 3 mm; and / or, as Figure 7 , Figure 11 and Figure 15 As shown, in the first direction, the spacing L3 between two adjacent rib groups is greater than 3 mm. For example, the spacing L2 between two adjacent protrusions 122 in the circumferential direction of the housing 11 can be 3.5 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm. Similarly, the spacing L3 between two adjacent rib groups in the first direction can be 3.5 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm.

[0038] In this embodiment, by making the spacing between adjacent protrusions 122 greater than 3mm, it not only facilitates the processing and molding (spraying) of multiple protrusions 122 and reduces mutual interference between adjacent protrusions 122, but also facilitates the full penetration and filling of structural adhesive into the gaps between multiple protrusions 122 when bonding multiple battery cells 100. This avoids the risk of localized leakage and insufficient adhesive due to insufficient filling, ensures the structural integrity of the final structural adhesive layer, guarantees the bonding strength between battery cells 100, and improves the uniformity of adhesive force distribution.

[0039] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the protrusion 122 is in the shape of a convex hull, that is, the protrusion 122 is in the shape of a raised dot. In this embodiment, by forming the protrusion 122 into a convex hull shape, the structure of the protrusion 122 can be simplified, and the spraying and forming of the protrusion 122 can be facilitated.

[0040] For example, the protrusion 122 can be a circular convex hull, an elliptical convex hull, or a polygonal convex hull. For example, the protrusion 122 can be rectangular, triangular, or hexagonal, etc. In the wall thickness direction of the housing 11, the side surface of the protrusion 122 facing away from the housing 11 is arranged parallel to the outer surface of the housing 11. For example, when the housing 11 is cylindrical, the outer surface of the protrusion 122 is an arc-shaped cylindrical surface coaxial with the outer surface of the housing 11.

[0041] In some embodiments of this utility model, such as Figure 2 , Figure 10 and Figure 14 As shown, the protrusion 122 extends along a straight line, a broken line, and / or a curve on the outer peripheral surface of the housing 11, and extends into an elongated or annular shape. That is, the protrusion 122 can extend along a straight line, a broken line, or a curve; or a portion of the protrusion 122 may extend along a straight line or a broken line in the extending direction, while another portion extends along a curve. For example, the protrusion 122 can extend along a straight line and / or a curve into an elongated shape, or it can extend along a curve and / or a broken line into an annular shape. Therefore, the shape of the protrusion 122 can be set according to actual needs to improve the adhesion between the battery cells 100.

[0042] In some embodiments of this utility model, such as Figure 1 and Figure 10 As shown, the protrusion 122 extends in a straight line along the first direction and is elongated. In this embodiment, the protrusion 122 extends in a straight line and is elongated, which can simplify the structure of the protrusion 122, facilitate the processing and molding of the protrusion 122, and further increase the contact area between the insulating layer 12 and the structural adhesive, thereby improving the interlocking force and adhesion between the insulating layer 12 and the structural adhesive.

[0043] In some embodiments of this utility model, such as Figure 14and Figure 15 As shown, in the direction from one end of the housing 11 in the first direction toward the other end (e.g.) Figure 14 As shown in the bottom-up direction, the protrusion 122 first extends obliquely towards one side of the housing 11 in the circumferential direction, and then extends obliquely towards the other side of the housing 11 in the circumferential direction. For example, the protrusion 122 can extend along an arc line protruding 122 towards one side of the housing 11 in the circumferential direction, or the protrusion 122 can be formed into a U-shaped or V-shaped protrusion protruding 122 towards one side of the housing 11 in the circumferential direction. This increases the surface area of ​​the protrusion 122, increases the bonding area between the protrusion 122 and the structural adhesive layer, further improves the interlocking force between the protrusion 122 and the structural adhesive layer, and improves the bonding strength and reliability between adjacent battery cells 100.

[0044] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the protrusion 122 is circular, which simplifies its structure, facilitates processing, and reduces stress concentration. Furthermore, the diameter of the protrusion 122 is 1.5mm-15mm. For example, the diameter of the protrusion 122 can be 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, or 15mm. This ensures the connection strength between the protrusion 122 and the insulating body 121, guarantees sufficient interlocking and adhesive force between the protrusion 122 and the structural adhesive, and avoids incomplete filling of the structural adhesive between the protrusions due to excessively large protrusions 122, thus improving bonding efficiency.

[0045] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the protrusion 122 extends into an elongated shape along a first direction. In this first direction, the ratio of the length L4 of the protrusion 122 to the total height L0 of the housing 11 is 0.1-0.8. For example, the ratio of the length L4 of the protrusion 122 to the total height L0 of the housing 11 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8. In this embodiment, by ensuring that the ratio of the length L4 of the protrusion 122 to the total height L0 of the housing 11 is greater than or equal to 0.1 and less than or equal to 0.8, sufficient contact length between the protrusion 122 and the structural adhesive can be guaranteed, improving the interlocking force between the protrusion 122 and the structural adhesive. Furthermore, it can prevent the protrusion 122 from interfering with the components at both ends of the housing 11.

[0046] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the protrusion 122 extends into an elongated shape along the first direction, and the ratio of the length L4 of the protrusion 122 in the first direction to the width b of the protrusion 122 in the circumferential direction of the housing 11 is greater than or equal to 3. For example, the ratio of the length L4 of the protrusion 122 to the width b of the protrusion 122 can be 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, or 10 and above. In this embodiment, by making the length L4 of the protrusion 122 greater than or equal to three times the width b of the protrusion 122, a continuous and relatively long adhesive interface can be formed at the location of the protrusion 122 along the first direction, which improves the interlocking force between the protrusion 122 and the structural adhesive. It can also make the adhesive force uniformly transmitted in the first direction, effectively dispersing stress and reducing the risk of delamination or cracking between the battery housing 10 and the structural adhesive.

[0047] In some embodiments of this utility model, such as Figure 1 , Figure 6 , Figure 10 and Figure 14 As shown, the housing 11 is cylindrical with its axis extending along a first direction. When the housing 11 is used for a battery cell 100, the battery cell 100 is a cylindrical battery cell 100. In this embodiment, the housing 11 is cylindrical, which can improve the uniformity of stress distribution, pressure resistance, and heat dissipation performance of the housing 11. Figure 1 The housing 11 includes a side plate and an end plate. The side plate is an annular cylindrical shape and both ends of the side plate are open in the first direction. The end plate covers both ends of the side plate. The side plate can be integrally formed with one of the end plates. The terminal post 20 of the battery cell 100 can pass through the end plate to electrically connect to the electrode assembly 30 disposed in the housing 11.

[0048] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the housing 11 is cylindrical, with multiple protrusions 122 arranged at intervals along the circumference of the housing 11. The angle c between two adjacent protrusions 122 along the circumference of the housing 11 can be 10°-120°. For example, the angle c between two adjacent protrusions 122 along the circumference of the housing 11 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, or 120°. This not only reduces interference between adjacent protrusions 122 but also provides sufficient gaps between them, allowing structural adhesive to fully penetrate and fill the gaps between the protrusions 122, improving the structural integrity of the adhesive bonded to the battery casing 10, and ensuring the bonding strength between the battery cells 100.

[0049] The battery cell 100 according to a second aspect embodiment of the present invention includes the battery casing 10 according to the first aspect embodiment of the present invention described above. For example... Figure 1As shown, the battery cell 100 may further include a battery casing 10, a terminal post 20, and an electrode assembly 30. The inner side of the battery casing 10 defines a receiving cavity. The electrode assembly 30 is disposed in the receiving cavity of the battery casing 10. The terminal post 20 passes through the battery casing 10 and is connected to the tab of the electrode assembly 30. An injection hole is formed on the battery casing 10, and electrolyte is injected into the receiving cavity through the injection hole.

[0050] According to the battery cell 100 of the present utility model embodiment, by providing the battery casing 10 of the first aspect embodiment described above, the overall performance of the battery cell 100 is improved.

[0051] The battery device according to a third aspect embodiment of the present invention includes a plurality of battery cells 100 according to the second aspect embodiment of the present invention described above. The plurality of battery cells 100 are arranged sequentially along a second direction and / or a third direction, and adjacent battery cells 100 are bonded together. The first direction, the second direction, and the third direction intersect each other. For example, the first direction, the second direction, and the third direction are perpendicular to each other.

[0052] The battery device includes a housing and multiple battery cells 100. The battery cells 100 are arranged in the housing and can form multiple cell groups. Each cell group includes multiple battery cells 100 arranged sequentially along a second direction. The multiple cell groups are arranged sequentially in a third direction. In adjacent cell groups, the battery cells 100 can be arranged facing each other or staggered in the second direction. Furthermore, in the second direction, adjacent battery cells 100 within the same cell group are bonded together with structural adhesive. In the third direction, battery cells 100 in adjacent cell groups are bonded together with structural adhesive.

[0053] According to the battery device of the present invention, by providing the battery cell 100 of the second aspect embodiment described above, the overall performance of the battery device is improved.

[0054] The following will refer to Figures 1-17 This invention describes a battery device according to four specific embodiments of the present invention.

[0055] Example 1, refer to Figure 1The battery device includes a housing and multiple battery cells 100. The housing is square, and the battery cells 100 are arranged in the housing. The battery cells 100 can form multiple cell groups. Each cell group includes multiple battery cells 100 arranged sequentially in a front-to-back direction. The multiple cell groups are arranged sequentially in a left-to-right direction. The battery cells 100 in two adjacent cell groups can be arranged facing each other or staggered in the left-to-right direction. Each battery cell 100 includes a battery casing 10, a terminal post 20, and an electrode assembly 30. The inner side of the battery casing 10 defines a receiving cavity, and the electrode assembly 30 is disposed in the receiving cavity. The terminal post 20 passes through the battery casing 10 and is connected to the tab of the electrode assembly 30.

[0056] like Figures 1-5 As shown, the battery casing 10 includes a housing 11 and an insulating layer 12. The housing 11 is a cylinder with its axis extending in the vertical direction. The insulating layer 12 includes an insulating body 121 and a plurality of protrusions 122. The insulating body 121 at least completely covers the outer peripheral surface of the housing 11. The plurality of protrusions 122 are provided on the insulating body 121. When spraying the insulating layer 12, the insulating body 121 is sprayed first, and then the plurality of protrusions 122 are sprayed on the surface of the insulating body 121. The height of the protrusions 122 protruding from the outer surface of the insulating body 121 is 0.03mm-0.5mm.

[0057] like Figures 1-3 As shown, multiple protrusions 122 are evenly spaced along the circumference of the housing 11 and extend in a straight line in the vertical direction into elongated strips. The ratio of the length L4 of the protrusion 122 in the vertical direction to the width b of the protrusion 122 in the circumference of the housing 11 is greater than or equal to 3. The ratio of the length L4 of the protrusion 122 to the height L0 of the housing 11 is 0.1-0.8. The minimum distance L1 between the protrusion 122 and the upper and lower end faces of the housing 11 is greater than one-tenth of the height L0 of the housing 11. In the circumference of the housing 11, the included angle c between two adjacent protrusions 122 on the circumference of the housing 11 is 10°-120°.

[0058] When multiple battery cells 100 are assembled into the housing of the battery device, adjacent battery cells 100 are bonded together by an adhesive layer (e.g., structural adhesive). Since the insulating layer 12 is provided with multiple protrusions 122, the adhesive force between the adhesive layers of the battery cells 100 can be improved during bonding, the torsional resistance between the battery cells 100 and the adhesive layer can be increased, and the bonding reliability between the battery cells 100 can be improved.

[0059] Example 2, as Figures 6-9As shown, the structure of this embodiment is largely the same as that of Embodiment 1, with identical components using the same reference numerals. The only difference is that the protrusion 122 in Embodiment 1 extends into a long strip along the vertical direction, while the protrusion 122 in this Embodiment 2 is circular, with a diameter of 1.5mm-15mm. Furthermore, multiple protrusions 122 constitute five rib groups, each rib group including multiple protrusions 122 evenly spaced along the circumference of the housing 11. The multiple rib groups are spaced apart in the vertical direction, and the distance L3 between the protrusions 122 in two adjacent rib groups is greater than 3mm.

[0060] Example 3, as Figures 10-13 As shown, the structure of this embodiment is roughly the same as that of embodiment one, with the same reference numerals used for the same components. The only difference is that the multiple protrusions 122 in embodiment one form a rib group, while the multiple protrusions 122 in this embodiment three form two rib groups. The two rib groups are arranged at intervals in the vertical direction, and the distance L3 between the two rib groups is greater than 3mm.

[0061] Example 4, as Figures 14-17 As shown, the structure of this embodiment is roughly the same as that of embodiment three, with the same components using the same reference numerals. The only difference is that the protrusion 122 in embodiment three is a long strip extending in a straight line in the vertical direction, while the protrusion 122 in this embodiment four is a V-shape that opens towards the housing 11 on one side in the circumferential direction.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0063] Furthermore, 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery casing (10), characterized in that, include: A housing (11) extending along a first direction; An insulating layer (12) includes an insulating body (121) and a plurality of protrusions (122). The insulating body (121) is wrapped around the outer peripheral surface of the housing (11) extending in the first direction. The plurality of protrusions (122) are spaced apart on the insulating body (121) and protrude from the side surface of the insulating body (121) opposite to the outer peripheral surface of the housing (11).

2. The battery casing (10) according to claim 1, characterized in that, In the thickness direction of the insulating layer (12), the protrusion (122) protrudes from the surface of the insulating body (121) by a height of 0.03 mm to 0.5 mm; and / or, The minimum distance between the protrusion (122) and the end face of the shell (11) in the first direction is the first distance, and the first distance is greater than or equal to one-tenth of the total height of the shell (11) in the first direction.

3. The battery casing (10) according to any one of claims 1-2, characterized in that, The plurality of protrusions (122) form at least one rib group, each rib group including a plurality of protrusions (122) arranged circumferentially along the housing (11), the plurality of rib groups being arranged at intervals in the first direction.

4. The battery casing (10) according to claim 3, characterized in that, In the circumferential direction of the housing (11), the distance between two adjacent protrusions (122) is greater than 3 mm; and / or, in the first direction, the distance between two adjacent rib groups is greater than 3 mm.

5. The battery casing (10) according to any one of claims 1-2, characterized in that, The protrusion (122) is in the shape of a convex hull, or the protrusion (122) extends along a straight line, a broken line and / or a curve on the outer peripheral surface of the housing (11), and extends into a strip or a ring shape.

6. The battery casing (10) according to claim 5, characterized in that, The protrusion (122) extends in a straight line along the first direction in an elongated shape; or, In the direction from one end of the housing (11) in the first direction toward the other end, the protrusion (122) first extends obliquely toward one side of the housing (11) in the circumferential direction, and then extends obliquely toward the other side of the housing (11) in the circumferential direction; or, The protrusion (122) is a circular protrusion (122), and the diameter of the protrusion (122) is 1.5mm-15mm.

7. The battery casing (10) according to any one of claims 1-2, characterized in that, The protrusion (122) extends into an elongated shape along the first direction, wherein, In the first direction, the ratio of the length of the protrusion (122) to the total height of the housing (11) is 0.1-0.8, and / or the ratio of the length of the protrusion (122) in the first direction to the width of the protrusion (122) in the circumferential direction of the housing (11) is greater than or equal to 3.

8. The battery casing (10) according to claim 1, characterized in that, The shell (11) is cylindrical with its axis extending along the first direction.

9. A battery cell (100), characterized in that, Includes the battery casing (10) according to any one of claims 1-8.

10. A battery device, characterized in that, The battery cell (100) according to claim 9 is provided, wherein a plurality of battery cells (100) are arranged sequentially along a second direction and / or a third direction, and adjacent battery cells (100) are bonded together, wherein the first direction, the second direction and the third direction intersect each other.

Images