Irregular-shaped battery cell, battery device and electric equipment

Abstract

The application provides a special-shaped battery cell, a battery device and an electric device. The special-shaped battery cell is used for a hot melt adhesive layer connected with a shell containing the special-shaped battery cell. The hot melt adhesive layer is arranged on an outer side surface of at least one current collector opposite to the shell in the special-shaped battery cell. The spacing between the edge of the opposite hot melt adhesive layer and the edge of the outer side surface of the current collector is d, and 3mm≤d≤6mm. The application can reduce the cracking problem of the shell of the battery provided with the special-shaped battery cell caused by falling to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a non-standard battery cell, battery device, and electrical equipment. Background Technology

[0002] With the rapid development of new energy technologies, batteries have been widely used in mobile phones, electric vehicles, electric two-wheelers, power tools, and other fields. The inventors have discovered that the battery casings of mobile phones, wearable electronic products, and other similar devices crack after being dropped. Utility Model Content

[0003] In view of the above problems, this application provides a non-standard battery cell, a battery device and an electrical device, which aims to reduce the problem of battery casing cracking caused by drops.

[0004] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0005] In a first aspect, embodiments of this application provide a non-standard battery cell, the non-standard battery cell including a hot melt adhesive layer for connecting with a housing containing the non-standard battery cell, the hot melt adhesive layer being disposed on the outer side of at least one current collector in the non-standard battery cell opposite to the housing, the distance between the edge of the opposite hot melt adhesive layer and the edge of the outer side of the current collector being d, 3mm≤d≤6mm.

[0006] In one possible implementation, the irregularly shaped cell is a cell with at least one non-straight edge.

[0007] In one possible implementation, the irregularly shaped cell includes opposing first and second sides, both of which are non-straight edges.

[0008] In one possible implementation, the irregularly shaped battery cell includes straight edges and non-straight edges, with the tabs of the irregularly shaped battery cell extending from the straight edges.

[0009] In one possible implementation, the irregularly shaped cell is an irregularly shaped stacked cell.

[0010] In one possible implementation, the current collector with the hot melt adhesive layer is an irregularly shaped current collector.

[0011] In one possible implementation, the irregularly shaped battery cell includes a first battery cell and a second battery cell, both of which have straight sides. The first battery cell and the second battery cell have different sizes and are spliced ​​together to form the irregularly shaped battery cell.

[0012] In one possible implementation, the irregularly shaped battery cell includes multiple surfaces, among which the surface with the hot melt adhesive layer has the largest area.

[0013] In one possible implementation, the distance between the edge of the hot melt adhesive layer and the edge of the outer side of the current collector is equal at each location of the hot melt adhesive layer.

[0014] In one possible implementation, the thickness of the hot melt adhesive layer is 25–48 μm.

[0015] In one possible implementation, the hot melt adhesive layer has multiple through holes.

[0016] In one possible implementation, the hot melt adhesive layer is a polyolefin hot melt adhesive layer, a polyurethane hot melt adhesive layer, a polyester hot melt adhesive layer, a polyamide hot melt adhesive layer, a polyethylene hot melt adhesive layer, or a polystyrene hot melt adhesive layer.

[0017] In one possible implementation, the irregularly shaped battery cell further includes a single-sided adhesive layer connecting the first electrode, the separator, and the second electrode of the irregularly shaped battery cell, wherein the current collector having the hot melt adhesive layer is one of the first current collector of the first electrode and the second current collector of the second electrode.

[0018] In one possible implementation, the single-sided adhesive layer connecting the first electrode, the separator, and the second electrode of the irregularly shaped battery cell comprises multiple segments spaced apart.

[0019] In one possible implementation, the single-sided adhesive layer is located in the region between the edge of the hot melt adhesive layer and the edge of the current collector.

[0020] In one possible implementation, the single-sided adhesive layer is not provided at the junction of adjacent sides of the irregularly shaped battery cell.

[0021] In one possible implementation, the single-sided adhesive layer is provided on each side of the irregularly shaped battery cell.

[0022] In one possible implementation, the area of ​​the hot melt adhesive layer covering the outer side of the current collector is S1, the area of ​​the single-sided adhesive layer covering the outer side of the current collector is S2, and the area of ​​the outer side of the current collector is S, where 70% ≤ (S1 + S2) / S ≤ 95%.

[0023] In one possible implementation, the single-sided adhesive layer is a polyethylene terephthalate (PET) layer or a polyimide layer.

[0024] In one possible implementation, the irregularly shaped battery cell includes a first side, which is a non-straight side. The first side includes a first side segment, a second side segment, and a third side segment connected in sequence. A single-sided adhesive layer is provided on the first side segment, the second side segment, and the third side segment. The second side segment is not located on the same straight line as the first side segment, and the second side segment is not located on the same straight line as the third side segment.

[0025] Secondly, embodiments of this application provide a battery device, including a housing and a battery cell disposed in the housing, wherein the battery cell is the irregularly shaped battery cell described in the first aspect.

[0026] In one possible implementation, the battery device is a single cell, a battery module, or a battery pack.

[0027] In one possible implementation, the battery device is a single cell.

[0028] In one possible implementation, the battery device is a battery module.

[0029] In one possible implementation, the battery device is a battery pack.

[0030] In one possible implementation, the housing is a steel shell or a titanium shell.

[0031] In one possible implementation, the housing includes a bottom shell and a cover plate connected to the bottom shell, the cover plate being connected to the battery cell via the hot melt adhesive layer, and the thickness of the cover plate being less than the thickness of the bottom shell.

[0032] In one possible implementation, the thickness of the bottom shell ranges from 0.03 to 0.5 mm, the thickness of the cover plate ranges from 0.03 to 0.3 mm, and the thickness of the hot melt adhesive layer is 25 to 48 μm.

[0033] In one possible implementation, the housing is connected to the negative electrode of the irregularly shaped battery cell.

[0034] Secondly, embodiments of this application provide an electrical device, which includes the battery device described in the first aspect.

[0035] The irregularly shaped battery cell, battery device, and electrical equipment provided in this application embodiment, including the battery device with the irregularly shaped battery cell, can effectively utilize the limited internal space of the product, thereby increasing the battery capacity without increasing the product volume. When the irregularly shaped battery cell in this application embodiment is fixed to the casing to form a battery by a hot melt adhesive layer disposed thereon, by designing the relative distance between the edge of the hot melt adhesive layer and the edge of the outer side of the current collector in the irregularly shaped battery cell opposite to the casing to be in the range of 3 to 6 mm, the uneven adhesion stress between the irregularly shaped battery cell and the casing can be reduced, that is, the excessive concentration of adhesion stress between the irregularly shaped battery cell and the casing can be reduced. Under the action of external force (such as drop), the problem of tearing of the casing / current collector with hot melt adhesive layer caused by the shear force between the irregularly shaped battery cell and the casing can be reduced to a certain extent, and the relative movement or torsion of the irregularly shaped battery cell and the casing can be reduced, that is, the problem of casing cracking of the battery with the irregularly shaped battery cell in this application embodiment caused by drop can be avoided to a certain extent. At the same time, it can provide sufficient support area to support the easily deformable area located in the middle part of the casing / current collector, which helps to improve the battery's drop resistance.

[0036] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the frame and energy storage system for hoisting energy storage devices provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0039] Figure 1 A schematic diagram of a non-standard battery cell provided in an embodiment of this application;

[0040] Figure 2 A cross-sectional view of a non-standard battery cell provided in an embodiment of this application;

[0041] Figure 3 This is a diagram showing the separated state of a non-standard battery cell provided in an embodiment of this application.

[0042] Figure 4 This is a front view of a non-standard battery cell provided in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of a battery device provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 11: Hot melt adhesive layer;

[0046] 12: First electrode; 121: First current collector; 122: First active material layer; 123: First tab;

[0047] 13: Diaphragm;

[0048] 14: Second electrode plate; 141: Second current collector; 142: Second active material layer; 143: Second tab;

[0049] 15: Single-sided adhesive layer;

[0050] 1a: First side segment, 1b: Second side segment, 1c: Third side segment;

[0051] 2: Shell, 21: Bottom shell, 22: Cover plate. Detailed Implementation

[0052] As described in the background section, in existing mobile phones with batteries, the battery casing 2 cracks after a drop. To address this technical problem, embodiments of this application provide a non-standard battery cell, a battery device, and an electrical appliance. The battery device, including the non-standard battery cell, can effectively utilize the limited internal space of the product, thereby increasing battery capacity without increasing the product's size. By setting a hot melt adhesive layer 11 on the irregularly shaped battery cell to fix it to the casing 2 to form a battery, and by designing the relative distance between the edge of the hot melt adhesive layer 11 and the edge of the outer side of the current collector in the irregularly shaped battery cell opposite to the casing 2 in the range of 3 to 6 mm, the uneven bonding stress between the irregularly shaped battery cell and the casing 2 can be reduced, that is, the excessive concentration of bonding stress between the irregularly shaped battery cell and the casing 2 can be reduced. Under the action of external force (such as drop), the tearing of the current collector with the hot melt adhesive layer 11 on the casing 2 caused by the shear force between the irregularly shaped battery cell and the casing 2 can be reduced to a certain extent, and the relative movement or torsion between the irregularly shaped battery cell and the casing 2 can be reduced, that is, the cracking problem of the casing 2 of the battery with the irregularly shaped battery cell in this embodiment of the application can be avoided to a certain extent due to drop. At the same time, sufficient support area can be provided to support the easily deformable area located in the middle part of the casing 2 / current collector, which is beneficial to improving the battery's drop resistance. In other words, the safety performance of the irregularly shaped battery cells, battery devices, and electrical equipment provided in the embodiments of this application has been improved.

[0053] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0054] The battery includes a casing 2 and battery cells, with the battery cells housed within the casing 2, as shown in the reference. Figure 2 and Figure 3 The battery cell includes a first electrode 12, a separator 13, and a second electrode 14. One of the first electrode 12 and the second electrode 14 is a positive electrode, and the other is a negative electrode. The first electrode 12 includes a first current collector, a first active material layer 122 on one side of the first current collector, and a first tab 123 connected to the first current collector. The second electrode 14 includes a second current collector 141, a second active material layer 142 on one side of the second current collector 141, and a second tab 143 connected to the second current collector 141. In some embodiments, when the battery casing 2 is energized, one of the first electrode 12 and the second electrode 14 may not have a separate tab and may be directly connected to the casing 2 by the current collector.

[0055] Please refer to the attached document. Figure 1 To be continued Figure 4This application provides a non-standard battery cell and a battery device including the non-standard battery cell, which can effectively utilize the limited space inside the product, thereby increasing the battery capacity without increasing the product volume. The non-standard battery cell includes a hot melt adhesive layer 11 for connecting to a housing 2 that houses the non-standard battery cell. The hot melt adhesive layer 11 is disposed on the outer surface of at least one current collector in the non-standard battery cell opposite to the housing 2, and the distance between the edge of the opposing hot melt adhesive layer 11 and the edge of the outer surface of the current collector is d, where 3mm ≤ d ≤ 6mm. The irregularly shaped battery cell housing 2 is connected by a hot melt adhesive layer 11 to form a battery. The hot melt adhesive layer 11 is disposed on the outer side of the current collector opposite to the housing 2. An active material layer can be disposed on the inner side of the current collector opposite to the housing 2. The distance between the edge of the hot melt adhesive layer 11 and the edge of the outer side of the current collector is designed to be in the range of 3 to 6 mm. This can reduce the uneven bonding force between the irregularly shaped battery cell and the housing 2, that is, reduce the excessive concentration of bonding force between the irregularly shaped battery cell and the housing 2. Under the action of external force (such as drop), the problem of tearing of the housing 2 / current collector with hot melt adhesive layer 11 caused by the shear force between the irregularly shaped battery cell and the housing 2 can be reduced to a certain extent. This reduces the relative movement or torsion of the irregularly shaped battery cell and the housing 2, that is, to a certain extent avoids the problem of cracking of the housing 2 of the battery with the irregularly shaped battery cell in the embodiment of this application due to drop. At the same time, it can provide sufficient support area to support the easily deformable area located in the middle part of the casing 2 / current collector, which is beneficial to improving the battery's drop resistance. That is, the safety performance of the irregularly shaped battery cell, battery device and electrical equipment provided in the embodiments of this application is improved.

[0056] It is understandable that the current collector for setting the hot melt adhesive layer 11 can be either the first current collector 121 or the second current collector 141.

[0057] In some specific embodiments, the hot melt adhesive layer 11 is disposed on the outer side of a current collector opposite to the housing 2 in the irregularly shaped battery cell, that is, the hot melt adhesive layer 11 is disposed on one outer side of the irregularly shaped battery cell. The scheme of disposing of the hot melt adhesive layer 11 on multiple sides has a smaller volume.

[0058] In some specific embodiments, the hot melt adhesive layer 11 is disposed on the outer surface of the two current collectors opposite to the housing 2 in the irregularly shaped battery cell. The two current collectors being opposite to each other can make the connection between the irregularly shaped battery cell and the housing 2 more stable.

[0059] In some specific embodiments, the distance between the edge of the opposing hot melt adhesive layer 11 and the edge of the outer side of the current collector is d, where 3mm ≤ d ≤ 6mm. The distance between the edge of the opposing hot melt adhesive layer 11 and the edge of the outer side of the current collector ranges from 3 to 6mm, meaning that the distance can be 3mm in some locations, 4mm in others, 4.5mm in others, 5mm in others, and 6mm in others. The distance of 3mm ≤ d ≤ 6mm can, to some extent, reduce the uneven adhesion force between the irregularly shaped battery cell and the casing 2 in this application, and at the same time simplify the process of applying the hot melt adhesive layer 11 (e.g., reducing the control precision of the equipment and reducing the impact of the environment on adhesive overflow).

[0060] In some specific embodiments, the irregularly shaped battery cell is a cell with at least one side being a non-straight edge. The design of the irregularly shaped battery cell allows electrical devices using this type of cell to make full use of space, contributing to the miniaturization of the electrical devices.

[0061] In some specific embodiments, the irregularly shaped battery cell includes opposing first and second sides, both of which are non-straight edges. This irregularly shaped battery cell design allows electrical devices using it to make full use of space; the non-straight edges on both sides adapt to the spatial layout within the device, further reducing its size.

[0062] In some specific embodiments, the irregularly shaped battery cell includes straight edges and non-straight edges. The tabs of the irregularly shaped battery cell are led out from the straight edges. The design of the irregularly shaped battery cell allows the electrical equipment using the irregularly shaped battery cell to make full use of space, which helps to miniaturize the electrical equipment. At the same time, leading the tabs of the irregularly shaped battery cell from the straight edges, compared with the scheme of leading the tabs from the non-straight edges, can reduce the influence of other components located on the non-straight edges on the tabs and ensure the stability of the connection between the tabs and other components.

[0063] In some specific embodiments, the irregularly shaped battery cell can be formed by an irregularly shaped current collector, or by splicing together multiple non-irregularly shaped battery cells of different sizes. The irregularly shaped battery cell can be formed by a lamination process or a winding process.

[0064] In some specific embodiments, the irregularly shaped battery cell is an irregularly shaped stacked battery cell. Multiple first electrode sheets 12, separators 13, and second electrode sheets 14 are stacked sequentially to form the irregularly shaped battery cell. The first electrode sheets 12 and second electrode sheets 14 have opposite polarities, resulting in battery devices using this irregularly shaped battery cell offering advantages such as high space utilization, long cycle life, and high safety. The outermost layer of the irregularly shaped battery cell is a single-sided electrode sheet of the first electrode sheet 12 (i.e., the current collector of the electrode sheet is coated with an active material layer on only one side). The active material layer of the single-sided electrode sheet corresponds to the second electrode sheet 14. The side of the single-sided electrode sheet facing away from the second electrode sheet 14 is an empty foil area, on which a hot melt adhesive layer 11 is provided to bond the irregularly shaped battery cell to the casing 2, preventing relative movement between the irregularly shaped battery cell and the casing.

[0065] In some specific embodiments, the current collector with a hot melt adhesive layer 11 in the irregularly shaped battery cell is an irregularly shaped current collector. Compared with the scheme of splicing multiple battery cells of different sizes formed by non-irregularly shaped current collectors to form an irregularly shaped battery cell, the process is simpler and the electrical performance is more stable.

[0066] In some specific embodiments, the irregularly shaped battery cell includes a first battery cell and a second battery cell. Both the first and second battery cells have straight sides, meaning they are not irregularly shaped. The first and second battery cells have different dimensions and are joined together to form the irregularly shaped battery cell. This irregularly shaped battery cell can also be produced using existing mature winding or stacking processes to create simpler first and second battery cells, which are then electrically connected by welding or bonding to form the irregularly shaped battery cell. This reduces the difficulty of manufacturing irregularly shaped battery cells and improves material utilization.

[0067] In some specific embodiments, the irregularly shaped battery cell includes multiple surfaces, among which the surface with the hot melt adhesive layer 11 has the largest area. It is understood that the hot melt adhesive layer 11 can be disposed on one of the largest surfaces, or on all of the largest surfaces. Disposing of the hot melt adhesive layer 11 on the largest surfaces can increase the connection strength between the irregularly shaped battery cell and the housing 2.

[0068] In some specific embodiments, the distance between the edge of the hot melt adhesive layer 11 and the edge of the outer side of the current collector is equal at all locations of the hot melt adhesive layer 11. This equal distance ensures that the adhesive strength at each edge of the hot melt adhesive layer 11 is the same, reducing the likelihood of tearing of the current collector and the housing 2.

[0069] In some specific embodiments, the thickness of the hot melt adhesive layer 11 is 25–48 μm. The thickness of the hot melt adhesive layer 11, at 25–48 μm, ensures the bonding strength between the irregularly shaped battery cell and the casing 2, while also reducing the amount of adhesive used and thus the thickness of the battery cell.

[0070] In some specific embodiments, the hot melt adhesive layer 11 has multiple through holes. The porous structure of the hot melt adhesive layer 11 can avoid the problem of air bubbles caused by a large adhesive application area.

[0071] In some specific embodiments, the hot melt adhesive layer 11 is a polyolefin-based hot melt adhesive layer (such as polyethylene hot melt adhesive), a polyurethane-based hot melt adhesive layer, a polyester-based hot melt adhesive layer, a polyamide-based hot melt adhesive layer, or a polystyrene-based hot melt adhesive layer. The hot melt adhesive layer 11 melts when heated; in its liquid state, it is viscous and can firmly bond the housing 2 and the irregularly shaped battery cell. After the temperature decreases, it rapidly cools and solidifies, ensuring the bonding strength between the housing 2 and the irregularly shaped battery cell.

[0072] In some specific embodiments, the irregularly shaped battery cell further includes a single-sided adhesive layer 15 connecting the first electrode 12, the separator 13, and the second electrode 14 of the irregularly shaped battery cell. The current collector with the hot melt adhesive layer 11 is one of the first current collector of the first electrode 12 and the second current collector 141 of the second electrode 14. The single-sided adhesive layer 15 fixes the multiple first electrodes 12, separators 13, and second electrodes 14 of the irregularly shaped battery cell into a whole.

[0073] In some specific embodiments, the single-sided adhesive layer 15 connecting the first electrode 12, the separator 13 and the second electrode 14 of the irregularly shaped battery cell includes multiple segments spaced apart. The multiple segments of the single-sided adhesive layer 15 can achieve dispersed bonding, achieving a fixing effect with less adhesive. At the same time, the spacing between the multiple segments of the single-sided adhesive layer 15 facilitates electrolyte wetting, reducing the risk to the battery's electrical performance.

[0074] In some specific embodiments, the single-sided adhesive layer 15 is located in the region between the edge of the hot melt adhesive layer 11 and the edge of the current collector. The single-sided adhesive layer 15 extends from one side of the irregularly shaped battery cell to the other side, and the projection of the single-sided adhesive layer 15 in the thickness direction of the irregularly shaped battery cell does not overlap with the hot melt adhesive layer 11, which can avoid increasing the thickness of the irregularly shaped battery cell and improve space utilization.

[0075] In some specific embodiments, no single-sided adhesive layer 15 is provided at the junction of adjacent sides of the irregularly shaped battery cell. The spacing between the single-sided adhesive layers 15 covers the corner area of ​​the irregularly shaped battery cell, which simplifies the processing of the single-sided adhesive layer 15 and can also reduce the amount of adhesive tape used.

[0076] In some specific embodiments, each side of the irregularly shaped battery cell is provided with a single-sided adhesive layer 15. The single-sided adhesive layer 15 provides a more uniform force to fix the irregularly shaped battery cell into a whole, and the electrolyte wets the irregularly shaped battery cell more uniformly.

[0077] In some specific embodiments, the area of ​​the hot melt adhesive layer 11 covering the outer surface of the current collector is S1 ( Figure 4 The area covered by the medium-hot melt adhesive layer 11), and the area of ​​the outer side of the current collector covered by the single-sided adhesive layer 15 is S2 ( Figure 4The area covered by the single-sided adhesive layer 15), and the area of ​​the outer surface of the current collector is S ( Figure 4 The area of ​​the hot melt adhesive layer 11 (excluding the area of ​​the two tabs) is 70% ≤ (S1 + S2) / S ≤ 95%. The hot melt adhesive layer 11 is set on the outermost single-sided electrode sheet of the irregularly shaped battery cell (the single-sided electrode sheet is located on the outermost side of the irregularly shaped battery cell and has an active material layer on only one side). The coverage area of ​​the hot melt adhesive layer 11 on the single-sided electrode sheet is S1, the coverage area of ​​the single-sided adhesive layer 15 on the single-sided electrode sheet is S2, and the area of ​​the single-sided electrode sheet (excluding the tabs) is S, 70% ≤ (S1 + S2) / S ≤ 95%. This ensures that the hot melt adhesive layer 11 and the single-sided adhesive layer 15 have sufficient bonding area with the irregularly shaped battery cell, reducing the area of ​​the empty foil area on the single-sided electrode sheet. When the shell 2 and the irregularly shaped battery cell have a relative movement tendency or relative movement occurs, it can reduce the force of the hot melt adhesive layer 11 on the irregularly shaped battery cell, which may tear the irregularly shaped battery cell or the shell 2 when it is tightly bonded. At the same time, it can provide sufficient support area to support the easily deformable area located in the middle part of the housing 2, which is beneficial to improving the battery's drop resistance.

[0078] In some specific embodiments, the single-sided adhesive layer 15 is a polyethylene terephthalate (PET) layer or a polyimide layer, which fixes the multiple first electrode plates 12, separators 13 and second electrode plates 14 of the irregularly shaped battery cell into a whole.

[0079] In some preferred embodiments, the irregularly shaped battery cell includes a first side, which is not a straight edge. The first side includes a first side segment 1a, a second side segment 1b, and a third side segment 1c connected in sequence. A single-sided adhesive layer 15 is provided on each of the first side segment 1a, the second side segment 1b, and the third side segment 1c. The second side segment 1b and the third side segment 1c are not on the same straight line as the first side segment 1a and the third side segment 1c. Providing single-sided adhesive layers 15 on each segment of the non-straight edge of the irregularly shaped battery cell provides a more uniform force to the irregularly shaped battery cell, and also ensures more uniform and smooth electrolyte wetting of the irregularly shaped battery cell.

[0080] Please refer to the attached document. Figure 5 This application also provides a battery device, which includes a housing 2 and a battery cell disposed in the housing 2. The battery cell is a non-standard battery cell as described in any of the above embodiments. It is understood that the battery device can be a single cell, a battery module, or a battery pack.

[0081] Since the battery device includes the irregularly shaped battery cell described in any of the above embodiments, it has all the beneficial effects of the irregularly shaped battery cell, and will not be described in detail here.

[0082] In some specific embodiments, the casing 2 is a steel casing or a titanium casing. Steel-cased or titanium-cased batteries have high impact resistance, which can further reduce the risk of damage in the event of accidental drops or impacts.

[0083] In some specific embodiments, the housing 2 includes a bottom shell 21 and a cover plate 22 connected to the bottom shell 21. The cover plate 22 is connected to the battery cell via a hot melt adhesive layer 11, and the thickness of the cover plate 22 is less than the thickness of the bottom shell 21. The hot melt adhesive layer 11 is bonded to the thinnest wall of the housing 2, namely the cover plate 22, which can enhance the buffering and vibration resistance of the housing 2 without affecting the internal heat dissipation of the housing 2.

[0084] In some specific embodiments, the thickness of the bottom shell 21 ranges from 0.03 to 0.5 mm, the thickness of the cover plate 22 ranges from 0.03 to 0.3 mm, and the thickness of the hot melt adhesive layer 11 is 25 to 48 μm, which can balance the strength, volume, and weight of the battery. The shell 2 can be a steel shell or a titanium shell.

[0085] In some specific embodiments, the housing 2 is connected to the negative electrode of the irregularly shaped battery cell, that is, the negative electrode of the irregularly shaped battery cell does not need to be die-cut or otherwise formed into a tab, which simplifies the battery device process and reduces production costs.

[0086] This application also provides an electrical device that includes the battery device from any of the above embodiments. Since this electrical device includes the battery device from any of the above embodiments, it possesses all the beneficial effects of the battery device, and will not be described in detail here. It is understood that the electrical device can be a mobile phone, wearable electronic product, tablet, laptop, vehicle, skateboard chassis, ship, drone, air conditioner, washing machine, microwave oven, printer, fax machine, etc.

[0087] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0088] It should be noted that the embodiments mentioned in the specification may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge of those skilled in the art.

[0089] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0090] The respondent points out that the terms "same" and "equivalent" used in this application are used with reference to the tolerances allowed in the industry and the inventive concept of this application.

[0091] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A non-standard battery cell, characterized in that, The irregularly shaped battery cell includes a hot melt adhesive layer for connecting to a housing that houses the irregularly shaped battery cell. The hot melt adhesive layer is disposed on the outer side of at least one current collector in the irregularly shaped battery cell that is opposite to the housing. The distance between the edge of the opposing hot melt adhesive layer and the edge of the outer side of the current collector is d, where 3mm ≤ d ≤ 6mm.

2. The irregularly shaped battery cell according to claim 1, characterized in that, The irregularly shaped battery cell satisfies at least one of the following conditions: (1) The irregularly shaped battery cell is a battery cell with at least one side being a non-straight side; (2) The irregularly shaped battery cell includes a first side and a second side opposite to each other, and both the first side and the second side are non-straight sides; (3) The irregularly shaped battery cell includes straight edges and non-straight edges, and the tabs of the irregularly shaped battery cell are led out from the straight edges.

3. The irregularly shaped battery cell according to claim 1, characterized in that, The irregularly shaped battery cell satisfies at least one of the following conditions: (1) The irregularly shaped battery cell is an irregularly shaped laminated battery cell; (2) The current collector with the hot melt adhesive layer is a non-circular current collector; (3) The irregular battery cell includes a first battery cell and a second battery cell. The sides of the first battery cell and the second battery cell are both straight edges. The first battery cell and the second battery cell have different sizes and are spliced ​​together to form the irregular battery cell. (4) The irregularly shaped battery cell includes multiple surfaces, among which the surface with the hot melt adhesive layer has the largest area.

4. The irregularly shaped battery cell according to any one of claims 1 to 3, characterized in that, The hot melt adhesive layer satisfies at least one of the following conditions: (1) At each point of the hot melt adhesive layer, the distance between the edge of the hot melt adhesive layer and the edge of the outer side of the current collector is equal; (2) The thickness of the hot melt adhesive layer is 25–48 μm; (3) The hot melt adhesive layer is provided with multiple through holes; (4) The hot melt adhesive layer is a polyolefin hot melt adhesive layer, a polyurethane hot melt adhesive layer, a polyester hot melt adhesive layer, a polyamide hot melt adhesive layer or a polystyrene hot melt adhesive layer.

5. The irregularly shaped battery cell according to any one of claims 1 to 3, characterized in that, The irregularly shaped battery cell also includes a single-sided adhesive layer connecting the first electrode, the separator, and the second electrode of the irregularly shaped battery cell. The current collector with the hot melt adhesive layer is one of the first current collector of the first electrode and the second current collector of the second electrode.

6. The irregularly shaped battery cell according to claim 5, characterized in that, The single-sided adhesive layer satisfies at least one of the following conditions: (1) The single-sided adhesive layer connecting the first electrode, the diaphragm and the second electrode of the irregularly shaped battery cell includes multiple segments spaced apart; (2) The single-sided adhesive layer is located in the area between the edge of the hot melt adhesive layer and the edge of the current collector; (3) The single-sided adhesive layer is not provided at the junction of the adjacent two sides of the irregularly shaped battery cell; (4) Each side of the irregularly shaped battery cell is provided with the single-sided adhesive layer; (5) The area of ​​the hot melt adhesive layer covering the outer side of the current collector is S1, the area of ​​the single-sided adhesive layer covering the outer side of the current collector is S2, the area of ​​the outer side of the current collector is S, and 70% ≤ (S1 + S2) / S ≤ 95%. (6) The single-sided adhesive layer is a polyethylene terephthalate (PET) layer or a polyimide layer.

7. The irregularly shaped battery cell according to claim 5, characterized in that, The irregularly shaped battery cell includes a first side, which is a non-straight side. The first side includes a first side segment, a second side segment, and a third side segment connected in sequence. A single-sided adhesive layer is provided on the first side segment, the second side segment, and the third side segment. The second side segment and the first side segment are not located on the same straight line, and the second side segment and the third side segment are not located on the same straight line.

8. A battery device, characterized in that, It includes a housing and a battery cell disposed in the housing, wherein the battery cell is a non-shaped battery cell as described in any one of claims 1 to 7.

9. The battery device according to claim 8, characterized in that, The battery device satisfies at least one of the following conditions: (1) The shell is a steel shell or a titanium shell; (2) The housing includes a bottom shell and a cover plate connected to the bottom shell. The cover plate is connected to the battery cell through the hot melt adhesive layer. The thickness of the cover plate is less than the thickness of the bottom shell. (3) The thickness of the bottom shell is 0.03-0.5 mm, the thickness of the cover plate is 0.03-0.3 mm, and the thickness of the hot melt adhesive layer is 25-48 μm; (4) The housing is connected to the negative electrode of the irregularly shaped battery cell.

10. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1 to 9.

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