Battery

Abstract

The utility model provides a battery which comprises a battery cell and a shell, the shell comprises a bottom plate and a side plate connected to the bottom plate, and the bottom plate and the side plate form an accommodating cavity for accommodating the battery cell; at least one side plate is a first side plate, the first side plate comprises a protruding part so that the first side plate can be in a step shape, and a concave part is formed below the protruding part; the shell further comprises a side sealing edge, the side sealing edge is connected to the connecting position of the bottom plate and the first side plate, and the side sealing edge is located in the concave part. The utility model is used for solving the technical problem of serious energy density loss of the battery caused by the width of the folding edge of the battery under the condition of not changing the folding edge design of the battery.

Description

Technical Field

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

[0002] Soft-pack lithium-ion batteries typically use an aluminum-plastic film to encapsulate the battery cell and electrolyte. Compared to traditional metal-cased batteries, this significantly reduces battery weight and offers advantages such as better safety performance and higher energy density, making them widely used in the consumer electronics field.

[0003] In pouch lithium-ion batteries, the sealing edge typically needs to be folded along the battery thickness direction. Existing folding methods still increase the battery width, resulting in energy density loss. Some solutions reduce the number of folds in the sealing edge to minimize its impact on battery width. However, when the sealing width is reduced, its moisture barrier performance deteriorates, making the battery more prone to expansion and bulging.

[0004] Therefore, it is urgent to reduce the adverse effects of the fold width on battery energy density without changing the battery fold design. Utility Model Content

[0005] This utility model provides a battery that solves the technical problem of severe energy density loss caused by the width of the battery's folded edge without changing the battery's folded edge design.

[0006] To achieve the above objectives, the present invention provides a battery, comprising: a battery cell and a housing, wherein the housing includes a bottom plate and a side plate connected to the bottom plate, and the bottom plate and the side plate form an accommodating cavity for accommodating the battery cell;

[0007] At least one of the side plates is a first side plate, the first side plate including a protrusion to make the first side plate step-shaped, and a recess is formed below the protrusion;

[0008] The housing also includes a side sealing edge, which is connected to the connection position between the bottom plate and the first side plate, and the side sealing edge is located within the recess.

[0009] The battery provided in this application has a first side plate with a protrusion, which makes the first side plate step-shaped, and a recess is formed below the protrusion, which facilitates the side sealing edge to be accommodated in the recess, reducing the external width space of the battery occupied by the side sealing edge, thereby reducing the energy density loss caused by the folding edge, and also providing additional structural support.

[0010] In addition, since the first side plate is stepped, the protrusion can increase the capacity of the accommodating cavity, allowing the cavity to accommodate larger cells or add other functional components to the battery. This improves the space utilization efficiency of the battery without increasing its external size, and provides greater flexibility for the overall performance and application scenarios of the battery.

[0011] In one possible implementation, the first side plate further includes a lower wall surface located between the bottom plate and the protrusion, the protrusion including an upper wall surface and a transition surface connecting the upper wall surface and the lower wall surface, the upper wall surface being further away from the center of the receiving cavity relative to the lower wall surface.

[0012] In one possible implementation, in the orthographic projection direction of the housing:

[0013] The distance T between the upper wall surface and the corresponding lower wall surface satisfies: 0.5mm ≤ T ≤ 2.5mm; and / or,

[0014] The projection of the side seal is located between the upper wall surface and the corresponding lower wall surface, and the distance between the side seal and the corresponding upper wall surface is S, where S≤0.5mm.

[0015] In one possible implementation, the transition surface is a plane, and the distance H from the transition surface to the base plate satisfies: 1.0mm ≤ H ≤ 3.3mm.

[0016] In one possible implementation, the battery further includes an adhesive that connects the side seal to the lower wall surface.

[0017] In one possible implementation, the battery further includes insulating tape covering the side of the side seal facing away from the first side plate.

[0018] One end of the insulating tape is fixedly connected to the side sealing edge, and the other end of the insulating tape is fixedly connected to the lower wall surface; or...

[0019] One end of the insulating tape is fixedly connected to the side sealing edge, and the other end of the insulating tape is fixedly connected to the upper wall surface.

[0020] In one possible implementation, the battery further includes an insulating gel disposed at the end of the side seal away from the base plate;

[0021] In the orthogonal projection direction of the housing: the projection of the insulating colloid is located within the projection range of the housing, and there is a distance D between the insulating colloid and the upper wall surface, where D≤0.3mm.

[0022] In one possible implementation, the side sealing edge includes a first folded edge, one end of which is connected to the base plate or the first side plate, and the other end of which is located within the recess.

[0023] In one possible implementation, the side sealing edge further includes a second folded edge connected to the end of the first folded edge away from the bottom plate, and the second folded edge is located between the first folded edge and the lower wall surface.

[0024] In one possible implementation, the side sealing edge further includes a curled edge connected to the end of the first folded edge away from the base plate.

[0025] In one possible implementation, at least one of the side plates is a second side plate, and the second side plate is interconnected with the first side plate.

[0026] The housing also includes a top sealing edge, which is connected to one side of the bottom plate or the second side plate, and the top sealing edge is bent toward the direction close to the second side plate and fits against the outer wall surface of the second side plate.

[0027] In one possible implementation, the connection between the top sealing edge and the side sealing edge forms an interference portion, which bends toward the recess and is located within the recess.

[0028] In one possible implementation, the top sealing edge extends out of the bottom plate or the second side plate by a length of B, and the distance from the transition surface to the bottom plate is H, where B ≤ H.

[0029] This application provides a battery that, compared with traditional batteries, has a structure that is closer to a regular hexahedron after folding, thus improving the compatibility between the battery and electrical devices.

[0030] This application provides a battery that optimizes space utilization and reduces energy density loss due to folds by improving the battery casing structure. Furthermore, this application eliminates the need to reduce the sealing width or the number of folds, thus preventing any impact on the battery's sealing performance.

[0031] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by a battery provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.

[0033] Figure 1 A cross-sectional view of the existing battery along its width.

[0034] Figure 2 A three-dimensional structural diagram of the battery provided in an embodiment of this utility model;

[0035] Figure 3 A cross-sectional view of the battery in the width direction provided for an embodiment of this utility model;

[0036] Figure 4 A partial structural schematic diagram of the battery casing provided in an embodiment of this utility model;

[0037] Figure 5 Another cross-sectional view of the battery in the width direction provided in an embodiment of this utility model;

[0038] Figure 6 An illustration showing the effect of using the insulating adhesive paper for the battery provided in this embodiment of the utility model;

[0039] Figure 7 Another effect diagram of the use of the insulating adhesive paper for the battery provided in this embodiment of the utility model;

[0040] Figure 8 An illustration showing the effect of using the insulating colloid in the battery provided in this embodiment of the utility model;

[0041] Figure 9 A schematic diagram of the side-sealed single-fold edge of the battery provided in an embodiment of this utility model;

[0042] Figure 10 A schematic diagram of the double-folded side sealing edge of the battery provided in an embodiment of this utility model;

[0043] Figure 11 A schematic diagram of the side sealing edge winding and folding structure of the battery provided in an embodiment of this utility model;

[0044] Figure 12 A top view of a battery provided for an embodiment of this utility model;

[0045] Figure 13 A left view of a battery provided for an embodiment of this utility model;

[0046] Figure 14A front view of a battery provided in an embodiment of this utility model;

[0047] Figure 15 A schematic diagram of the folded and unfolded side seal and top seal of the battery provided in this embodiment of the utility model;

[0048] Figure 16 A schematic diagram of the structure of the battery with the interference portion folded toward the top sealing edge, provided for an embodiment of this utility model;

[0049] Figure 17 A schematic diagram of the structure of the battery with the interference portion folded toward the side sealing edge, provided for an embodiment of this utility model;

[0050] Figure 18 This is a schematic diagram of the structure of the battery with the side seal and the interference portion located in the recess, as provided in an embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 10-cell;

[0053] 20 - Shell;

[0054] 21-Base plate;

[0055] 24-Top plate;

[0056] 22-First side plate;

[0057] 221 - Protrusion;

[0058] 222-Upper wall;

[0059] 223 - Transition surface;

[0060] 224-lower wall;

[0061] 23-Second side panel;

[0062] 30-Side sealing edge;

[0063] 31 - First fold;

[0064] 32 - Second fold;

[0065] 33 - Curled edge;

[0066] 40 - Adhesive;

[0067] 51-Insulating adhesive tape;

[0068] 52-Insulating colloid;

[0069] 60 - Recessed area;

[0070] 70-pole ear;

[0071] 80-Top edge sealing;

[0072] 81-Interference section;

[0073] 90-Side fold. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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.

[0075] In battery production, the sealing edge needs to be folded along the thickness direction of the battery. Usually, the battery folding method mainly adopts double folding or single folding process, which increases the battery width and causes the battery energy density to be lost. In some solutions, the impact of folding on the battery width is reduced by reducing the sealing width and the number of folds, but this will affect the battery's sealing performance and cause defects such as poor water vapor isolation effect.

[0076] refer to Figure 1 As shown, in existing batteries, the two ends of the casing 20 in the width direction are vertical, that is, the two ends in the X-axis direction are vertical. The presence of the side fold 90 will increase the space in the width direction of the casing 20, resulting in a loss of energy density in the battery.

[0077] This application provides a battery that optimizes space utilization and reduces energy density loss due to folds by improving the battery casing structure. Furthermore, this application eliminates the need to reduce the sealing width or the number of folds, thus preventing any impact on the battery's sealing performance.

[0078] The battery provided in the embodiments of this utility model is described below with reference to the accompanying drawings.

[0079] refer to Figure 2 , Figure 3 and Figure 4 As shown, this application provides a battery, including: a battery cell 10 and a housing 20. The housing 20 has an accommodating cavity for accommodating the battery cell 10. The housing 20 includes a bottom plate 21 and a side plate connected to the bottom plate 21. The bottom plate 21 and the side plate form the accommodating cavity for accommodating the battery cell 10.

[0080] At least one side plate is a first side plate 22, the first side plate 22 includes a protrusion 221 to make the first side plate 22 step-shaped, and a recess 60 is formed below the protrusion 221;

[0081] The housing 20 also includes a side sealing edge 30, which is connected to one side of the bottom plate 21 or the first side plate 22, and the side sealing edge 30 is located in the recess 60.

[0082] The battery provided in this application has a first side plate 22 with a protrusion 221, which makes the first side plate 22 step-shaped, and a recess 60 is formed below the protrusion 221, which facilitates the side sealing edge 30 to be accommodated in the recess 60, reduces the external width space of the battery occupied by the side sealing edge 30, thereby reducing the energy density loss caused by the folding edge, and also provides additional structural support.

[0083] In addition, since the first side plate 22 is stepped, the protrusion 221 can increase the capacity of the accommodating cavity, so that the accommodating cavity can accommodate larger cells or add other functional components of the battery. Without increasing the external size of the battery, the space utilization efficiency of the battery is improved, and greater flexibility is provided for the overall performance and application scenarios of the battery.

[0084] In one possible implementation, the protrusion 221 may protrude outward from the receiving cavity.

[0085] This application provides a battery that, compared with traditional batteries, has a structure that is closer to a regular hexahedron after folding, thus improving the compatibility between the battery and electrical devices.

[0086] In one possible implementation, the housing 20 may be made of aluminum-plastic film.

[0087] refer to Figure 2 As shown, the first direction is the width direction of the battery, referring to the direction indicated by the X-axis; the second direction is the length direction of the battery, referring to the direction indicated by the Y-axis.

[0088] In one possible implementation, the housing 20 includes a base plate 21 and side plates connected to the base plate 21. The number of side plates can be four, five, or six, etc., without specific limitation here. The following example uses four side plates.

[0089] In one possible implementation (not shown in the figure), the side plate at one end of the housing 20 along the first direction is a first side plate 22, and the side plate at the other end of the housing 20 along the first direction is a second side plate 23, which can be a vertical surface. This structure can reduce the space occupied by the folded edge on the battery width side.

[0090] In one possible implementation method, refer to Figure 2 , Figure 3 and Figure 4As shown, the side plates at both ends of the housing 20 along the first direction are both first side plates 22, which can reduce the space occupied by the folded edge on both sides of the battery width, further reduce the energy density loss caused by the folded edge, increase the space inside the accommodating cavity, and effectively improve the energy density of the battery. The side plates at both ends of the housing 20 along the second direction are both second side plates 23, and the second side plates 23 can be vertical surfaces.

[0091] In one possible implementation, the side plate at one end of the housing 20 along the second direction may also be a first side plate 22.

[0092] In one possible implementation, one end of the side seal 30 is connected to the connection point between the base plate 21 and the first side plate 22, and the side seal 30 is used to seal the battery casing 20.

[0093] In one possible implementation method, refer to Figure 3 and Figure 4 As shown, the first side plate 22 also includes a lower wall surface 224, which is located between the bottom plate 21 and the protrusion 221. The protrusion 221 includes an upper wall surface 222 and a transition surface 223, which connects the upper wall surface 222 and the lower wall surface 224. The upper wall surface 222 is further away from the center of the accommodating cavity than the lower wall surface 224. This makes the upper wall surface 222 convex relative to the lower wall surface 224, allowing the housing 20 to provide more space for accommodating battery cells or other components without increasing the overall width.

[0094] The lower wall 224 is the base part of the first side plate 22. By providing a protrusion 221 on the first side plate 22, the first side plate 22 is stepped. The upper wall 222 is further away from the center of the cavity than the lower wall 224, providing additional space inside the cavity, which is suitable for achieving higher capacity in a limited space.

[0095] In one possible implementation, the lower wall surface 224 is a vertical surface, the upper wall surface 222 is also a vertical surface, and the transition surface 223 can be a horizontal surface connecting the bottom end of the upper wall surface 222 and the top end of the lower wall surface 224. The transition surface 223 can also be an inclined surface.

[0096] In one possible implementation method, refer to Figure 5 As shown, in order to better arrange the side sealing edge 30 in the recessed portion 60 and avoid creating additional redundant side sealing edge 30, while also taking into account the processing capabilities of the equipment, the distance T between the upper wall surface 222 and the corresponding lower wall surface 224 in the orthogonal projection direction of the housing 20 satisfies: 0.5mm≤T≤2.5mm. Wherein, the distance T is also the width of the protrusion 221.

[0097] In this application, the orthographic projection direction of the casing 20, i.e., the thickness direction of the battery, is referenced. Figure 2 and Figure 5 The arrow Z in the diagram indicates the direction.

[0098] If T is too large, it means the width of the recessed portion 60 is too large, which weakens the supporting strength of the protrusion 221, affecting its stability and thus the safety of the battery. It also results in excessive redundancy in the space within the recessed portion 60. Conversely, if T is too small, the width of the recessed portion 60 will be insufficient, reducing the space within it. This can easily cause the side seal 30 to protrude beyond the recessed portion 60, resulting in the side seal 30 occupying the width of the battery.

[0099] In this embodiment, 0.5mm ≤ T ≤ 2.5mm balances the structural strength of the casing 20, the utilization of the internal space of the recess 60, and the processing capability of the casing 20. By designing T ≤ 2.5mm, the width of the protrusion 221 is avoided from being excessively increased, which would increase the external dimensions of the battery, while ensuring the mechanical strength and stability of the casing 20.

[0100] In one possible implementation, the distance T between the upper wall surface 222 and the corresponding lower wall surface 224 in the orthogonal projection direction of the housing 20 can be, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.3 mm or 2.5 mm.

[0101] In one possible implementation method, refer to Figure 5 As shown, the projection of the side sealing edge 30 is located between the upper wall surface 222 and the corresponding lower wall surface 224, and the distance between the side sealing edge 30 and the corresponding upper wall surface 222 is S, where S≤0.5mm.

[0102] The projection of the side seal 30 is located between the upper wall surface 222 and the corresponding lower wall surface 224, that is, the projection of the side seal 30 is located within the projection range of the housing 20. This is to ensure that the side seal 30 does not exceed the overall outline of the housing 20, thereby maintaining the compactness of the battery's external dimensions.

[0103] In one possible implementation, the distance S between the side sealing edge 30 and the corresponding upper wall surface 222 in the orthogonal projection direction of the housing 20 can be, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. The design of S ≤ 0.5mm aims to ensure the regularity of the battery shape and avoid space redundancy and wasted space in subsequent assembly stages.

[0104] In one possible implementation method, refer to Figure 3 and Figure 5As shown, the transition surface 223 is a plane, and the distance H from the transition surface 223 to the base plate 21 satisfies: 1.0mm ≤ H ≤ 3.3mm. The distance H from the transition surface 223 to the base plate 21 is also the height of the recessed part 60.

[0105] If H is too small, it will reduce the effective usable space of the recessed portion 60, affecting the volume of the recessed portion 60, increasing the difficulty of arranging the side sealing edge 30 within the recessed portion 60, and even causing the side sealing edge 30 to protrude beyond the recessed portion 60, thus increasing the width of the battery. If H is too large, it will result in excess space within the recessed portion 60, which is not conducive to increasing the accommodating space of the receiving cavity.

[0106] The transition surface 223 serves as the connecting surface between the upper wall surface 222 and the lower wall surface 224. Designing the transition surface 223 as a plane helps to simplify the manufacturing process while providing a stable structural transition.

[0107] In one possible implementation, the distance H from the transition surface 223 to the base plate 21 can be, for example, 1.0 mm, 1.3 mm, 2.5 mm, or 3.3 mm. This ensures that the recess 60 has sufficient height to accommodate the side sealing edge 30 and avoids the recess 60 being too high, which would limit the height of the protrusion 221, thereby ensuring a significant increase in the accommodating space of the cavity.

[0108] In one possible implementation method, refer to Figure 6 , Figure 7 and Figure 8 As shown, the battery also includes an adhesive 40, which connects the side seal 30 to the lower wall surface 224. The adhesive 40 firmly connects the side seal 30 to the lower wall surface 224, ensuring the integrity of the housing 20. Furthermore, the adhesive 40 provides additional sealing to prevent electrolyte leakage inside the battery and to protect the cells from external environmental influences.

[0109] In one possible implementation, the adhesive 40 includes, but is not limited to, hot melt adhesive, insulating adhesive, solid adhesive, quick-drying adhesive, etc.

[0110] In one possible implementation, the battery also includes insulating tape 51, which covers the side of the side seal 30 facing away from the first side plate 22.

[0111] In one possible implementation, the casing 20 is made of aluminum-plastic film material, which includes an insulating protective layer, a metal layer, and an insulating heat-sealing layer. The metal layer is located between the insulating protective layer and the insulating heat-sealing layer. When the battery is packaged, the aluminum-plastic film is folded together, and the edges of the folded aluminum-plastic film are sealed by heat sealing. The insulating heat-sealing layers of the folded aluminum-plastic film are fused together to form a side sealing edge 30 and a top sealing edge 80. Excess sealing edges need to be cut off, which can easily cause the metal layer located in the middle layer of the aluminum-plastic film to be exposed. This metal layer includes an aluminum foil layer, which poses a short circuit problem to external electronic devices.

[0112] In one possible implementation, when the side seal 30 uses a single folded edge, the aluminum foil in the aluminum-plastic film at the edge of the side seal 30 is exposed to the outside, resulting in exposed aluminum at the folded edge, which can easily lead to a short circuit between the housing 20 and external electronic devices. Therefore, in this embodiment, covering the side of the side seal 30 opposite to the first side plate 22 with insulating tape 51 can effectively prevent the aluminum foil in the aluminum-plastic film at the edge of the side seal 30 from being exposed to the outside, which is crucial for ensuring the safety and functionality of the battery.

[0113] In one possible implementation method, refer to Figure 6 As shown, one end of the insulating tape 51 is fixedly connected to the side sealing edge 30, and the other end of the insulating tape 51 is fixedly connected to the lower wall surface 224. This structure allows the insulating tape 51 to be accommodated within the recess 60, preventing the insulating tape 51 from increasing the width of the battery. The insulating tape 51 provides effective electrical insulation and protection, preventing the exposed aluminum foil at the end of the side sealing edge 30 from contacting external electronic devices and causing a short circuit.

[0114] In one possible implementation, one end of the insulating tape 51 can be pasted to the side sealing edge 30 to achieve a fixed connection with the side sealing edge 30, and the other end of the insulating tape 51 can be pasted to the lower wall surface 224 to achieve a fixed connection with the lower wall surface 224.

[0115] In one possible implementation method, refer to Figure 7 As shown, one end of the insulating tape 51 is fixedly connected to the side sealing edge 30, and the other end of the insulating tape 51 is fixedly connected to the upper wall surface 222, providing a more stable insulation and protection effect, preventing the aluminum foil exposed by the cut end of the side sealing edge 30 from contacting external electronic devices and causing a short circuit.

[0116] In one possible implementation, one end of the insulating tape 51 can be pasted to the side sealing edge 30 to achieve a fixed connection with the side sealing edge 30, and the other end of the insulating tape 51 can be pasted to the upper wall surface 222 to achieve a fixed connection with the upper wall surface 222.

[0117] In one possible implementation, the insulating tape is typically made of a material with good insulation and heat resistance, and needs to have good adhesion properties, such as polyester film or polyimide film.

[0118] In one possible implementation method, refer to Figure 8 As shown, the battery also includes an insulating colloid 52, which is disposed at the end of the side seal 30 away from the base plate 21. The insulating colloid 52 effectively prevents the aluminum foil in the aluminum-plastic film at the edge of the side seal 30 from being exposed to the outside, helping to ensure the safety and functionality of the battery.

[0119] In one possible implementation, in the orthogonal projection direction of the housing 20, the projection of the insulating colloid 52 lies within the projection range of the housing 20, and there is a gap D between the insulating colloid 52 and the upper wall surface 222, where D ≤ 0.3 mm. This structure effectively prevents the insulating colloid 52 from exceeding the width of the recess 60, thus avoiding an increase in the battery's width and preventing wear of the insulating colloid 52 caused by it exceeding the width of the recess 60, thereby ensuring a stable insulation effect on the end face of the side sealing edge 30.

[0120] In one possible implementation, the insulating colloid 52 is a cured (Ultraviolet Rays, abbreviated as UV) adhesive, i.e., a UV-cured adhesive. In other possible implementations, the insulating colloid 52 can be an insulating adhesive, a solid adhesive, a quick-drying adhesive, etc. After the insulating colloid 52 completely covers the end face of the side sealing edge 30, it is cured and shaped by means of heating, moisture, air drying, light exposure, etc., to ensure a stable connection and insulation effect.

[0121] In one possible implementation, the distance D between the insulating colloid 52 and the upper wall surface 222 may be, for example, 0.1 mm, 0.2 mm or 0.3 mm.

[0122] In one possible implementation method, refer to Figure 9 As shown, the side sealing edge 30 includes a first folded edge 31. One end of the first folded edge 31 is connected to the connection position between the bottom plate 21 and the first side plate 22, and the other end of the first folded edge 31 is located in the recess 60. The first folded edge 31 can be extended upward along the lower wall surface 224 in a vertical, inclined, or arc shape, and the side sealing edge 30 realizes a single folded edge.

[0123] In one possible implementation method, refer to Figure 10As shown, the side sealing edge 30 also includes a second folded edge 32, which is connected to the end of the first folded edge 31 away from the bottom plate 21, and is located between the first folded edge 31 and the lower wall surface 224. The second folded edge 32 is based on the first folded edge 31, with the end of the first folded edge 31 away from the bottom plate 21 folded downward along the lower wall surface 224 in a vertical, inclined, or arc-shaped manner, thus achieving a double folded edge for the side sealing edge 30.

[0124] The first folded edge 31 provides basic structural support for the side sealing edge 30. The second folded edge 32 increases the functionality of the side sealing edge 30 and improves its mechanical strength. It can effectively increase the size of the side sealing edge 30 along the first direction, improve the performance of the side sealing edge 30 in isolating moisture, and reduce problems such as battery swelling and bulging. This is crucial for improving the durability and reliability of the battery and extending its service life.

[0125] In one possible implementation method, refer to Figure 11 As shown, the side sealing edge 30 also includes a curled edge 33, which is connected to the end of the first folded edge 31 that is away from the bottom plate 21. The curled edge 33 is wound around the end of the side sealing edge 30 that is away from the bottom plate 21, so that the side sealing edge 30 can be curled and folded.

[0126] The curled edge 33 enhances the mechanical strength of the side seal edge 30 by curling, reducing the sharpness of the side seal edge 30 and thus reducing potential damage to other components during assembly and use. Furthermore, the curled edge 33 provides additional sealing, helping to isolate the battery from moisture and other environmental factors, contributing to improved overall rigidity and stability of the side seal edge 30.

[0127] In one possible implementation method, refer to Figure 15 and Figure 16 As shown, at least one side plate is a second side plate 23, and the second side plate 23 is connected to the first side plate 22; the housing 20 also includes a top sealing edge 80, which is connected to one side of the bottom plate 21 or the second side plate 23, and the top sealing edge 80 is bent toward the direction close to the second side plate 23 and fits against the outer wall surface of the second side plate 23.

[0128] When cells are assembled into a battery pack, a protection plate is usually welded. In order to reduce the space occupied by the protection plate at the head of the cell, the top sealing edge 80 located near the head of the cell is bent at 90° so that the top sealing edge 80 fits against the outer wall of the second side plate 23, thereby providing more space for the protection plate, which helps to optimize the internal space utilization of the battery pack and improve the compactness and functionality of the overall structure.

[0129] In one possible implementation, the connection between the top sealing edge 80 and the side sealing edge 30 forms an interference portion 81, which bends toward the recess 60 and is located within the recess 60.

[0130] Since one or both ends of the top sealing edge 80 are connected to the side sealing edge 30, interference will occur at the connection point between the top sealing edge 80 and the side sealing edge 30 after the top sealing edge 80 is bent. An interference portion 81 is formed at the connection point between the top sealing edge 80 and the side sealing edge 30. (Reference) Figure 15 and Figure 16 As shown, if the interference portion 81 is bent and attached to the top seal edge 80, it will occupy the space at the head of the cell, resulting in an increase in the volume of the assembled battery and a decrease in the battery's volumetric energy density. (Reference) Figure 15 and Figure 17 As shown, if the interference part 81 is bent and attached to the side seal 30, it will occupy the space on both sides of the cell and reduce the volumetric energy density of the battery.

[0131] refer to Figure 16 , Figure 17 and Figure 18 As shown, by bending the interference portion 81 toward the recess 60 and placing it within the recess 60, the interference portion 81 will not protrude from the battery, thereby avoiding increasing the overall volume of the battery pack and helping to improve the energy density of the battery.

[0132] In one possible implementation, the interference part 81 can be triangular or trapezoidal in shape.

[0133] In one possible implementation, the top sealing edge 80 extends beyond the bottom plate 21 or the second side plate 23 by a length of B. The portion of the top sealing edge 80 extending beyond the bottom plate 21 or the second side plate 23 is attached to the outer wall surface of the second side plate 23, i.e., the height of the top sealing edge 80 attached to the outer wall surface of the second side plate 23 is B. The distance from the transition surface 223 to the bottom plate 21 is H, where B ≤ H. This is to ensure that the interference portion 81 can be effectively accommodated within the recessed portion 60, ensuring that the recessed portion 60 has sufficient thickness to accommodate the interference portion 81.

[0134] The top sealing edge 80 is bent at the position where it connects to the bottom plate 21 or the second side plate 23, so that the top sealing edge 80 fits against the second side plate 23. The length of the top sealing edge 80 extending out of the bottom plate 21 or the second side plate 23 is B, that is, the height of the top sealing edge 80 fitting against the outer wall surface of the second side plate 23 is B. When the top sealing edge 80 is bent and fitted against the second side plate 23, in order to ensure that the interference portions 81 at both ends of the top sealing edge 80 are effectively accommodated in the recessed portion 60, the height of the recessed portion 60, that is, the distance H from the transition surface 223 to the bottom plate 21, needs to satisfy B≤H.

[0135] In one possible implementation, since the width of the interior of the housing 20 along the first direction is inconsistent in the upper and lower halves, it can be prepared by gas punching.

[0136] In one possible implementation method, refer to Figure 4 and Figure 14 As shown, the housing 20 also includes a top plate 24, which is located at both ends of the battery in the thickness direction, along with the bottom plate 21.

[0137] This application provides an embodiment of a battery, with reference to... Figure 3 As shown, the battery cell 10 includes a positive electrode, a negative electrode, and a separator located between the positive and negative electrode. Coatings are applied to both sides of the substrate of the positive electrode and the substrate of the negative electrode. The separator separates the positive and negative electrode. The upper wall surface 222 corresponds to the upper part of the accommodating cavity, and the lower wall surface 224 corresponds to the lower part of the accommodating cavity. The positive and negative electrode sheets located in the upper part of the accommodating cavity are wider, while those located in the lower part are narrower.

[0138] In one possible implementation method, refer to Figure 2 and Figure 12 As shown in the embodiment of this application, a battery also includes a tab 70. The tab 70 may extend from the housing 20 at one end along the length direction of the battery. There may be two tabs 70, namely a positive tab and a negative tab, wherein the positive tab is electrically connected to the positive electrode plate and the negative tab is electrically connected to the negative electrode plate.

[0139] In one possible implementation, the battery provided in this application embodiment further includes an electrolyte filled in a accommodating cavity, with the battery cell 10 immersed in the electrolyte.

[0140] refer to Figure 3 , Figure 5 and Figure 13 As shown in the embodiment of this application, the principle of improving battery energy density is as follows: Under the same battery size design, the battery provided in this embodiment has the same length dimension of the casing 20 as a traditional battery, that is, the battery length L is the same. Therefore, the space loss V caused by the folding edge of the battery provided in this embodiment is V=A×H×L, where: A is the width of the side sealing edge 30, H is the height of the recessed portion 60, and L is the length of the battery, that is, the length of the recessed portion 60. (Reference) Figure 1 As shown, the space loss of a traditional battery due to folding is V1 = A × H1 × L, where A is the width of the side seal 30, H1 is the thickness of the battery, and L is the length of the battery. Since H < H1, V1 < V1. Therefore, the battery provided in this application embodiment can effectively reduce space loss and improve the volumetric energy density of the battery.

[0141] This application places the side seal 30 and the interference portion 81 in the recessed portion 60, which can reduce the size of the battery in the first and second directions. When assembling the battery pack, it can effectively prevent the side seal 30 and the interference portion 81 from causing the battery to be too large, which helps to improve the energy density of the battery.

[0142] It should be noted that the numerical values ​​and ranges involved in this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0143] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc., used to indicate 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 indicated position or component must have a specific orientation, or a specific structure and operation, and therefore should not be construed as a limitation of this utility model.

[0144] 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 at least two, such as two, three, etc., unless otherwise explicitly specified.

[0145] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 connection that allows for communication; 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0146] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery, characterized in that, include: The battery cell (10) and the housing (20) include a base plate (21) and a side plate connected to the base plate (21), the base plate (21) and the side plate forming a cavity for accommodating the battery cell (10); At least one of the side panels is a first side panel (22), the first side panel (22) includes a protrusion (221) to make the first side panel (22) step-shaped, and a recess (60) is formed below the protrusion (221). The housing (20) further includes a side seal (30), which is connected to one side of the bottom plate (21) or the first side plate (22), and the side seal (30) is located in the recess (60).

2. The battery according to claim 1, characterized in that, The first side plate (22) further includes a lower wall surface (224), which is located between the bottom plate (21) and the protrusion (221). The protrusion (221) includes an upper wall surface (222) and a transition surface (223), which connects the upper wall surface (222) and the lower wall surface (224). The upper wall surface (222) is further away from the center of the accommodating cavity than the lower wall surface (224).

3. The battery according to claim 2, characterized in that, In the orthographic projection direction of the housing (20): The distance T between the upper wall surface (222) and the corresponding lower wall surface (224) satisfies: 0.5mm ≤ T ≤ 2.5mm; and / or, The projection of the side seal (30) is located between the upper wall surface (222) and the corresponding lower wall surface (224), and the distance between the side seal (30) and the corresponding upper wall surface (222) is S, where S≤0.5mm.

4. The battery according to claim 2, characterized in that, The transition surface (223) is a plane, and the distance H from the transition surface (223) to the base plate (21) satisfies: 1.0mm≤H≤3.3mm.

5. The battery according to claim 2, characterized in that, It also includes an adhesive (40) that connects the side seal (30) and the lower wall surface (224).

6. The battery according to claim 5, characterized in that, It also includes insulating tape (51), which covers the side of the side seal (30) facing away from the first side plate (22); One end of the insulating tape (51) is fixedly connected to the side sealing edge (30), and the other end of the insulating tape (51) is fixedly connected to the lower wall surface (224); or, One end of the insulating tape (51) is fixedly connected to the side sealing edge (30), and the other end of the insulating tape (51) is fixedly connected to the upper wall surface (222).

7. The battery according to claim 5, characterized in that, It also includes an insulating colloid (52), which is disposed at the end of the side seal (30) away from the base plate (21); In the orthographic projection direction of the housing (20): the projection of the insulating colloid (52) is located within the projection range of the housing (20), and there is a distance D between the insulating colloid (52) and the upper wall surface (222), where D≤0.3mm.

8. The battery according to any one of claims 2-7, characterized in that, The side sealing edge (30) includes a first folded edge (31), one end of which is connected to the bottom plate (21) or the first side plate (22), and the other end of which is located in the recess (60).

9. The battery according to claim 8, characterized in that, The side sealing edge (30) further includes a second folded edge (32), which is connected to the end of the first folded edge (31) away from the bottom plate (21), and the second folded edge (32) is located between the first folded edge (31) and the lower wall surface (224); or, The side sealing edge (30) also includes a curled edge (33), which is connected to the end of the first folded edge (31) away from the base plate (21).

10. The battery according to any one of claims 2-7, characterized in that, At least one of the side plates is a second side plate (23), and the second side plate (23) is connected to the first side plate (22); The housing (20) also includes a top sealing edge (80), which is connected to one side of the bottom plate (21) or the second side plate (23), and the top sealing edge (80) is bent toward the direction close to the second side plate (23) and fits against the outer wall surface of the second side plate (23).

11. The battery according to claim 10, characterized in that, The connection between the top sealing edge (80) and the side sealing edge (30) forms an interference portion (81), which bends toward the recess (60) and is located inside the recess (60).

12. The battery according to claim 10, characterized in that, The length of the top sealing edge (80) extending from the bottom plate (21) or the second side plate (23) is B, and the distance from the transition surface (223) to the bottom plate (21) is H, where B≤H.

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