Battery case, battery, and electric device

Abstract

The application discloses a battery shell, a battery and an electric device. The battery shell comprises a first shell and a second shell. The first shell comprises a first side plate and a first surrounding plate. The first surrounding plate is connected with the outer edge of the first side plate at an included angle. The second shell comprises a second side plate and a second surrounding plate. The second surrounding plate is connected with the outer edge of the second side plate at an included angle. The first surrounding plate is arranged on the inner side of the second surrounding plate. The first surrounding plate and the second surrounding plate are adapted to be sealed to make the first shell and the second shell define a sealed cavity. The first surrounding plate and the second surrounding plate are sealed by a welding metal layer. The battery shell designed according to the application can reduce the proportion of the space volume of the battery shell in the assembly space, and can improve the effective capacity and the energy density of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery shell, a battery and an electric device. BACKGROUND

[0002] In the related art, a battery is arranged in an electric device such as a mobile phone, a watch or a vehicle. With the miniaturization and light weight of the electric device, higher requirements are put forward for the structure of the battery. In order to ensure the sealing effect while reducing the thickness of the battery shell, the prior art generally welds the shell by forming a structure with a flange. However, the arrangement of the flange increases the volume of the battery shell, occupies too much assembly space in the electric device, interferes with the arrangement of other components in the electric device, and in the case where the proportion of the space volume occupied by the battery in the assembly space is determined, the greater the proportion of the assembly space volume occupied by the battery shell, the smaller the space in which the electrode assembly in the battery can be arranged, and the lower the capacity of the battery. The increase in the volume of the battery shell will result in a decrease in the energy density of the battery. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery shell. The battery shell designed according to the present application can reduce the proportion of the space volume occupied by the battery shell in the assembly space, while improving the effective capacity and energy density of the battery, by welding the first and second surrounding plates together through a weld metal layer to connect the first and second shells.

[0004] The present application also provides a battery having the above-mentioned battery shell.

[0005] The present application also provides an electric device having the above-mentioned battery.

[0006] The battery shell according to the present application comprises a first shell and a second shell, the first shell comprises a first side plate and a first surrounding plate, the first surrounding plate is connected at an angle to the outer edge of the first side plate, the second shell comprises a second side plate and a second surrounding plate, the second surrounding plate is connected at an angle to the outer edge of the second side plate, the first surrounding plate is arranged inside the second surrounding plate, the first and second surrounding plates are adapted to be sealed together to define a sealed cavity with the first and second shells; wherein the first and second surrounding plates are sealed together by a weld metal layer.

[0007] The battery case according to the present application connects the first and second surrounding plates by a welding metal layer to seal the battery, which is simple in operation, high in realization, and can simplify the steps of battery manufacturing, reduce the manufacturing cost of the battery, and connect the first and second cases by welding between the first and second surrounding plates to reduce the proportion of the space volume of the battery case in the assembly space. The battery case is designed in this way to avoid occupying too much assembly space in the electric device, so as to arrange other electronic components in the electric device, fully utilize the assembly space in the electric device, and improve the effective capacity and energy density of the battery.

[0008] According to some embodiments of the present application, a gap space is provided between the outer peripheral wall of the first surrounding plate and the inner peripheral wall of the second surrounding plate, and at least part of the welding metal layer is located in the gap space.

[0009] According to some embodiments of the present application, at least part of the welding metal layer is located between the outer peripheral wall of the first surrounding plate and the end of the second surrounding plate adjacent to the first side plate.

[0010] According to some embodiments of the present application, in the direction from the first surrounding plate to the second surrounding plate, the width of the gap space is A, in units of μm, and the thickness of the second surrounding plate is T, in units of μm; in the direction from the first side plate to the second side plate, the height of the part of the welding metal layer cooperating with the outer peripheral wall of the first surrounding plate is B, in units of μm; wherein the width of the gap space, the thickness of the second surrounding plate, and the height of the part of the welding metal layer cooperating with the outer peripheral wall of the first surrounding plate satisfy the following relationship: .

[0011] According to some embodiments of the present application, the width of the gap space, the thickness of the second surrounding plate, and the height of the part of the welding metal layer cooperating with the outer peripheral wall of the first surrounding plate satisfy: .

[0012] According to some embodiments of the present application, the width of the gap space satisfies: 0

[0013] According to some embodiments of the present application, the width of the gap space satisfies: 0

[0014] According to some embodiments of the present application, the first surrounding plate is perpendicular to the first side plate; and / or the second surrounding plate is perpendicular to the second side plate.

[0015] According to some embodiments of the present application, a first fillet is formed between the first surrounding plate and the first side plate; and / or a second fillet is formed between the second surrounding plate and the second side plate.

[0016] According to some embodiments of the present application, a distance between the second surrounding plate adjacent to one end of the first side plate and the second side plate is less than a distance between the first side plate and the second side plate.

[0017] According to some embodiments of the present application, the second surrounding plate is provided with a terminal assembly, the first surrounding plate is provided with a first avoiding space, the terminal assembly is arranged opposite to the first avoiding space and is electrically connected with the electrode assembly.

[0018] According to some embodiments of the present application, the second surrounding plate is provided with a liquid injection hole, the first surrounding plate is provided with a second avoiding space arranged opposite to the liquid injection hole, the liquid injection hole is communicated with the sealed cavity through the second avoiding space, and the battery shell further comprises a sealing assembly sealing the liquid injection hole.

[0019] According to some embodiments of the present application, the first surrounding plate is provided with a notch on a side facing the terminal assembly and the liquid injection hole to define the first avoiding space and the second avoiding space communicated.

[0020] According to some embodiments of the present application, the first avoiding space and the second avoiding space are arranged in a spaced manner.

[0021] According to some embodiments of the present application, a part of the sealing assembly is inserted into the liquid injection hole to seal the liquid injection hole; or the sealing assembly comprises a spacing part and a connecting part, the spacing part and the connecting part are connected at an included angle, the spacing part is arranged in a spaced manner with the liquid injection hole, and the connecting part is fixed to the second surrounding plate.

[0022] A battery according to the second aspect of the embodiments of the present application is briefly described below.

[0023] The battery according to the present application comprises: a battery shell configured as the battery shell in any one of the above embodiments; and an electrode assembly arranged in the sealed cavity. Since the battery according to the present application is provided with the battery shell in the above embodiments, the steps of manufacturing the battery are simple and easy to implement, and the cost of manufacturing the battery is lower.

[0024] A power consuming device according to the third aspect of the embodiments of the present application is briefly described below.

[0025] The power consuming device according to the present application includes the battery described in the above embodiments, and the battery is used to provide electric energy. Since the power consuming device according to the present application is provided with the battery of the above embodiments, the battery capacity of the power consuming device is higher, and the endurance is stronger.

[0026] In summary, the battery shell according to the present application is provided with a welding metal layer between the first and second surrounding plates for welding cooperation, so as to realize the connection of the first and second shells, which is simple to operate and has good sealing effect. Meanwhile, the proportion of the space volume of the battery shell in the assembly space can be reduced. In this way, the battery shell is designed, so that the battery can avoid occupying too much assembly space in the power consuming device, so as to arrange other electronic components in the power consuming device. The assembly space in the power consuming device can be fully utilized. In the case that the proportion of the space volume of the battery in the assembly space is determined, the smaller the volume of the battery shell, i.e. the proportion of the assembly space volume occupied by the battery shell, the larger the space in which the electrode assembly can be arranged, i.e. the volume of the electrode assembly, so that the proportion of the assembly space volume occupied by the electrode assembly in the battery can be increased, thereby improving the effective capacity and energy density of the battery.

[0027] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a whole structure diagram of a battery according to an embodiment of the present application.

[0030] Figure 2 is a structure diagram of a battery when a first shell and a second shell are separated according to an embodiment of the present application.

[0031] Figure 3 is a structure diagram of a first shell according to an embodiment of the present application.

[0032] Figure 4 is a structure diagram of a second shell according to an embodiment of the present application.

[0033] Figure 5 is a structure diagram when a first shell and a second shell are assembled according to an embodiment of the present application.

[0034] Figure 6 is a structure diagram before a first shell and a second shell are welded according to an embodiment of the present application.

[0035] Figure 7 is a structure diagram after a first surrounding plate and a second surrounding plate are welded according to an embodiment of the present application.

[0036] Figure 8 Fig. 8 is a schematic view of a structure after welding of a first case and a second case according to an embodiment of the present application.

[0037] Figure 9 Fig. 9 is a schematic view of a battery profile according to an embodiment of the present application.

[0038] Figure 10 Fig. 10 is a schematic view of a structure of a sealing assembly according to a first embodiment of the present application.

[0039] Figure 11 Fig. 11 is a schematic view of a structure of a sealing assembly according to a second embodiment of the present application.

[0040] Figure 12 Fig. 12 is a schematic view of a structure of a sealing assembly according to a third embodiment of the present application.

[0041] Figure 13 Fig. 13 is a schematic view of a structure of a sealing assembly according to a fourth embodiment of the present application.

[0042] Figure 14 Fig. 14 is a schematic view of a structure of a sealing assembly according to a fifth embodiment of the present application.

[0043] Reference numerals:

[0044] 1. A battery

[0045] 10. A battery case; 10a, a sealed cavity; 10b, a gap space; 11, a first case; 111, a first side plate; 112, a first surrounding plate; 112a, a notch; 12, a second case; 121, a second side plate; 122, a second surrounding plate; 1221, a terminal assembly; 1222, a flange; 122a, a liquid injection hole; 122b, a through hole; 13, a sealing assembly; 131, a spacer; 132, a connecting portion

[0046] 20. An electrode assembly; 21, a tab

[0047] 30. A weld metal layer DETAILED DESCRIPTION

[0048] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are not intended to limit the present application. The same or similar components are denoted by the same or similar reference numerals throughout the drawings.

[0049] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes the vertical direction of the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "under" of the first feature to the second feature includes the vertical direction of the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0053] In related technologies, batteries are incorporated into electrical devices such as mobile phones, watches, and automobiles. With the miniaturization and lightweighting of these devices, higher demands are placed on battery structure. To ensure a tight seal while reducing battery casing thickness, existing technologies typically use a flanged structure for welding and fixing the casing. However, this flanged approach increases the volume of the battery casing, occupying excessive assembly space within the device and interfering with the arrangement of other components. Furthermore, given a fixed proportion of the battery's space within the assembly area, a larger proportion of the battery casing reduces the space available for internal electrode components, resulting in lower battery capacity. The increased casing volume also leads to a decrease in battery energy density.

[0054] The following is for reference. Figures 1-14 The battery casing 10 according to an embodiment of the present invention is described.

[0055] like Figures 1-9 As shown, the battery casing 10 according to the present invention includes: a first casing 11 and a second casing 12. The first casing 11 includes a first side plate 111 and a first enclosure plate 112. The first enclosure plate 112 is connected to the outer edge of the first side plate 111 at an angle. The second casing 12 includes a second side plate 121 and a second enclosure plate 122. The second enclosure plate 122 is connected to the outer edge of the second side plate 121 at an angle. The first enclosure plate 112 is disposed inside the second enclosure plate 122. The first enclosure plate 112 and the second enclosure plate 122 are adapted to be sealed together so that the first casing 11 and the second casing 12 define a sealed cavity 10a. The first enclosure plate 112 and the second enclosure plate 122 are sealed together by a weld metal layer 30. Specifically, at least a portion of the first enclosure 112 of the battery casing 10 can be disposed inside at least a portion of the second enclosure 122, and the at least a portion of the first enclosure 112 and the at least a portion of the second enclosure 122 can be sealed together by welding. In this case, the first side plate 111, the second side plate 121, the first enclosure 112, and the second enclosure 122 together define a sealed cavity 10a, which is suitable for accommodating the electrode assembly 20. The battery casing 10 and the electrode assembly 20 together constitute the battery 1, which can be used in an electrical device. The electrical device has an assembly space, which contains the battery 1 and other components.

[0056] More specifically, such as Figures 8-9As shown, the first surrounding plate 112 and the second surrounding plate 122 are welded together, and the weld metal layer 30 can be arranged on the outer circumferential wall of the first surrounding plate 112 and the inner circumferential wall of the second surrounding plate 122 to seal the first surrounding plate 112 and the second surrounding plate 122, or can be arranged on the end of the second surrounding plate 122 adjacent to the first side plate 111 and the outer circumferential wall of the first surrounding plate 112 to seal the first surrounding plate 112 and the second surrounding plate 122, as long as the first surrounding plate 112 and the second surrounding plate 122 can be welded together, and the welding position is not limited herein. In some embodiments, at least part of the first surrounding plate 112 and / or at least part of the second surrounding plate 122 can be melted to weld the first surrounding plate 112 and the second surrounding plate 122 together, or another welding member can be used to melt between the first surrounding plate 112 and the second surrounding plate 122 to weld the first surrounding plate 112 and the second surrounding plate 122 together, as long as the first surrounding plate 112 and the second surrounding plate 122 can be welded together, and the specific structure melted during welding is not limited herein, wherein the at least part of the first surrounding plate 112 melted, the at least part of the second surrounding plate 122 melted, or the welding member melted is configured as the weld metal layer 30.

[0057] It can be understood that, in the case that the proportion of the space volume occupied by the battery 1 in the assembly space is determined, the smaller the volume of the battery shell 10, i.e., the proportion of the assembly space volume occupied by the battery shell 10, the larger the space in which the electrode assembly 20 can be arranged, i.e., the volume of the electrode assembly 20, and the proportion of the assembly space volume occupied by the electrode assembly 20 in the battery 1 can be increased, thereby increasing the effective capacity of the battery 1.

[0058] The battery shell 10 according to the present application welds the first surrounding plate 112 and the second surrounding plate 122 by the weld metal layer 30 to seal the battery 1, which is simple to operate, has high degree of realization, and can simplify the manufacturing steps of the battery 1, reduce the manufacturing cost of the battery 1, and weld the first surrounding plate 112 and the second surrounding plate 122 to connect the first shell 11 and the second shell 12, which can reduce the proportion of the space volume occupied by the battery shell 10 in the assembly space. The battery shell 10 is thus designed to avoid the battery 1 occupying too much assembly space in the electric device, so as to arrange other electronic components in the electric device, fully utilize the assembly space in the electric device, and increase the effective capacity of the battery 1 and the energy density of the battery 1.

[0059] In the related art, the thickness of the shell of the battery in the electric device such as a mobile phone or a watch is micron-level, so as to make the weight of the electric device such as a mobile phone or a watch lower, and make the electric device such as a mobile phone or a watch more convenient for users to use. Due to the extremely small thickness of the battery shell, the existing technology generally welds the flanges of the upper and lower two shell parts of the battery shell to seal the battery, which has high requirements for the flatness of the flanges, and the requirements for processing the upper and lower two shell parts are correspondingly increased, making the battery manufacturing process complicated and the manufacturing cost high.

[0060] In some embodiments, the first surrounding plate 112 and the second surrounding plate 122 are welded by laser welding. Laser welding is more accurate and rapid, and is suitable for welding connection of the first surrounding plate 112 and the second surrounding plate 122 with a thickness of microns.

[0061] According to some embodiments of the present application, as shown in Figures 6-9 A gap space 10b is arranged between the outer peripheral wall of the first surrounding plate 112 and the inner peripheral wall of the second surrounding plate 122, and at least part of the weld metal layer 30 is located in the gap space 10b. Specifically, when the first surrounding plate 112 and the second surrounding plate 122 are welded, the weld metal layer 30 can be located between the outer peripheral wall of the first surrounding plate 112 and the inner peripheral wall of the second surrounding plate 122, i.e. in the gap space 10b, to seal the first surrounding plate 112 and the second surrounding plate 122. At this time, the weld metal layer 30 fills at least part of the gap space 10b, and plays a role of sealing and connecting the first surrounding plate 112 and the second surrounding plate 122.

[0062] According to some embodiments of the present application, as shown in Figures 6-9 At least part of the weld metal layer 30 is located between the end of the second surrounding plate 122 adjacent to the first side plate 111 and the outer peripheral wall of the first surrounding plate 112. Specifically, part of the weld metal layer 30 is located between the end of the second surrounding plate 122 adjacent to the first side plate 111 and the outer peripheral wall of the first surrounding plate 112, and the other part of the weld metal layer 30 is located in the gap space 10b. At this time, the weld metal layer 30 fills at least part of the gap space 10b and the space between the end of the second surrounding plate 122 adjacent to the first side plate 111 and the outer peripheral wall of the first surrounding plate 112, to improve the sealing effect of the battery 1.

[0063] In some embodiments, as shown in Figure 7 In the spacing direction from the first surrounding plate 112 to the second surrounding plate 122, the width A of the gap space 10b is in the range of 0-100 μm. For example, the width A of the gap space 10b can be 0.01 μm, 0.02 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm. The width A of the gap space 10b needs to be adjusted according to the thickness of the first shell 11 and the second shell 12. After the first shell 11 and the second shell 12 are matched, the width of the gap space 10b has a significant effect on the sealing effect of the battery 1. The width A of the gap space 10b in the range of 0-100 μm can not only ensure that the battery shell 10 has a good sealing effect, but also facilitate the assembly of the first shell 11 and the second shell 12.

[0064] According to some embodiments of the present application, as shown inFigure 7 As shown, in the interval direction from the first baffle plate 112 to the second baffle plate 122, the width of the gap space 10b is A, the unit is μm, the thickness of the second baffle plate 122 is T, the unit is μm; in the direction from the first side plate 111 to the second side plate 121, the height of the portion of the weld metal layer 30 matched with the outer circumferential wall of the first baffle plate 112 is B, the unit is μm; wherein the width of the gap space 10b, the thickness of the second baffle plate 122 and the height of the portion of the weld metal layer 30 matched with the outer circumferential wall of the first baffle plate 112 satisfy the following relationship: 95000, exemplary, It can be 50μm², 500μm², 5000μm², 9950μm², 33500μm²μm², etc. It can be seen from the relationship that the width A of the gap space 10b, the thickness T of the second baffle plate 122 and the matching height of the weld metal layer 30 with the first baffle plate 112 will affect the sealing effect and energy density of the battery, when the width of the gap space 10b, the thickness of the second baffle plate 122 and the height of the portion of the weld metal layer 30 matched with the outer circumferential wall of the first baffle plate 112 satisfy the relationship: 95000, the battery 1 can have sufficient battery capacity and energy density while ensuring sealing performance.

[0065] According to some embodiments of the application, the width of the gap space 10b, the thickness of the second baffle plate 122 and the height of the portion of the weld metal layer 30 matched with the outer circumferential wall of the first baffle plate 112 satisfy: 0

[0066] According to some embodiments of the application, in order to ensure the energy density of the battery 1, that is, the endurance time of the electric device, and to ensure the sealing performance and sealing strength of the battery 1, that is, to avoid the battery 1 from leaking gas or liquid, The range of A is preferably: , exemplary, It can be 1050μm², 5000μm², 5001μm², 9951μm², 10530μm², 17900μm², etc.

[0067] According to some embodiments of the present application, the width A of the gap space 10b is preferably in the range of 0 < A < 30 μm, and the width of the gap space 10b in this range ensures the energy density of the battery 1 and guarantees the sealing performance and sealing strength of the battery 1; the thickness T of the second surrounding plate 122 is preferably in the range of 20 μm < T < 100 μm, and the thickness of the second surrounding plate 122 in this range makes the battery shell 10 occupy a smaller volume of the battery 1, so that the electrode assembly 20 can be arranged in a larger space, which can ensure the energy density of the battery 1 and guarantee the sealing performance and sealing strength of the battery 1; the cooperation height B of the weld metal layer 30 and the first surrounding plate 112 is preferably in the range of 150 μm < B < 400 μm, and the cooperation height of the weld metal layer 30 and the first surrounding plate 112 in this range can ensure the welding strength of the weld metal layer 30 to the first surrounding plate 112 and the second surrounding plate 122, guarantee the sealing effect of the battery 1, and thus guarantee the sealing performance and sealing strength of the battery 1.

[0068] In some embodiments, as shown in Figure 5 , Figure 9 , the first shell 11 and the second shell 12 are directly opposite to each other so that the first surrounding plate 112 is arranged in the inside of the second surrounding plate 122, and then the gap space 10b is sealed by welding, so that the outer peripheral wall of the first surrounding plate 112 is sealingly cooperated with the inner peripheral wall of the second surrounding plate 122, which can reduce the volume of the battery 1 and avoid occupying too much assembly space in the electric device, so as to arrange other electronic components in the electric device, and the assembly space in the electric device can be fully utilized.

[0069] In some embodiments, as shown in Figures 5-9 , the first surrounding plate 112 and the second surrounding plate 122 are directly opposite to each other, and the second surrounding plate 122 is provided with a flange 1222 adjacent to one end of the first side plate 111, and the flange 1222 is fused into the weld metal layer 30 and welded into the gap space 10b by laser welding, so that the weld metal layer 30 is filled in at least part of the gap space 10b and between the free end of the second surrounding plate 122 and the outer peripheral wall of the first surrounding plate 112, and the flange 1222 is fused into the gap space 10b by laser welding, which can reduce the influence of the gap space 10b on the sealing degree of the sealed cavity 10a and improve the effective welding strength of the welding area of the first surrounding plate 112 and the second surrounding plate 122. In some embodiments, the angle of laser welding can be 0-90°.

[0070] According to some embodiments of the present application, as shown in Figure 6 , Figure 8 , Figure 9As shown, the first surrounding plate 112 is perpendicular to the first side plate 111; and / or the second surrounding plate 122 is perpendicular to the second side plate 121. In some embodiments, the first surrounding plate 112 is perpendicular to the first side plate 111 and the second surrounding plate 122 is perpendicular to the second side plate 121, so as to define a rectangular cross-section of the sealed cavity 10a, facilitating the arrangement of the electrode assembly 20.

[0071] According to some embodiments of the present application, as shown in Figure 6 , Figure 8 , Figure 9 As shown, a first chamfer is formed between the first surrounding plate 112 and the first side plate 111; and / or a second chamfer is formed between the second surrounding plate 122 and the second side plate 121. The first chamfer and the second chamfer can reduce stress concentration and strengthen the structural strength of the battery case 10.

[0072] According to some embodiments of the present application, as shown in Figure 6 , Figure 8 , Figure 9 As shown, the distance between the second surrounding plate 122 adjacent to one end of the first side plate 111 and the second side plate 121 is less than the distance between the first side plate 111 and the second side plate 121, so that in the first direction from the first side plate 111 to the second side plate 121, a portion of the first surrounding plate 112 protrudes from the end of the second surrounding plate 122 facing the first shell 11, facilitating the connection of the first surrounding plate 112 and the second surrounding plate 122. At this time, at least part of the first surrounding plate 112 and at least part of the second surrounding plate 122 are sealingly connected by means including but not limited to welding, bonding or thermal bonding.

[0073] According to some embodiments of the present application, as shown in Figure 1 , Figure 2 , Figure 5 , Figure 9 As shown, the second surrounding plate 122 is provided with a terminal assembly 1221, and the first surrounding plate 112 is provided with a first avoiding space, the terminal assembly 1221 is arranged opposite to the first avoiding space and is electrically connected with the electrode assembly 20. Specifically, in some embodiments, the electrode assembly 20 includes a cathode layer, an anode layer and a separator layer arranged between the cathode layer and the anode layer. The first side plate 111 and the first surrounding plate 112 enclose a first cavity, and the second side plate 121 and the second surrounding plate 122 enclose a second cavity. Before the first shell 11 and the second shell 12 are connected, the electrode assembly 20 can be placed in the first cavity. At this time, the tab 21 is exposed from the first avoiding space and connected with the terminal assembly 1221 located on the second surrounding plate 122. Then, the first shell 11 and the second shell 12 can be connected, so that at least part of the first shell 11 is accommodated in the second cavity and cooperates with the second shell 12 to define the sealed cavity 10a, and the electrode assembly 20 is accommodated in the sealed cavity 10a as a whole.

[0074] According to some embodiments of the present application, as shown in Figure 1 、 Figure 2 、 Figure 4 The second surrounding plate 122 is provided with a liquid injection hole 122a, and the first surrounding plate 112 is provided with a second avoiding space opposite to the liquid injection hole 122a. The liquid injection hole 122a is communicated with the sealed cavity 10a through the second avoiding space. The battery shell 10 further comprises a sealing assembly 13 for sealing the liquid injection hole 122a. Specifically, the first shell 11 and the second shell 12 cooperate to define the sealed cavity 10a, and the sealed cavity 10a contains the electrode assembly 20. At this time, the electrolyte can be injected into the sealed cavity 10a through the liquid injection hole 122a. After the electrolyte is injected, the sealing assembly 13 is used to seal the liquid injection hole 122a, so as to seal the sealed cavity 10a and avoid liquid leakage of the battery 1, thereby ensuring the safety of the battery 1. The first surrounding plate 112 is provided with the second avoiding space to make the liquid injection hole 122a communicated with the sealed cavity 10a, so as to inject the electrolyte into the sealed cavity 10a through the liquid injection hole 122a.

[0075] According to some embodiments of the present application, as shown in Figures 1-2 The first surrounding plate 112 is provided with a notch 112a on the side facing the terminal assembly 1221 and the liquid injection hole 122a to define the first avoiding space and the second avoiding space. When the electrode assembly 20 is placed in the first cavity, the notch 112a on the first surrounding plate 112 can avoid the tab 21 of the electrode assembly 20, so as to facilitate the tab 21 to extend out and connect with the terminal assembly 1221 on the second surrounding plate 122. The sealed cavity 10a contains the electrode assembly 20 and the electrolyte. The electrode assembly 20 can be a winding type electrode or a stacked type electrode. The terminal assembly 1221 is connected to the tab 21 of the electrode assembly 20 in the sealed cavity 10a through the through hole 122b on the second surrounding plate 122 and the notch 112a on the first surrounding plate 112. The through hole 122b is provided to facilitate the electrical coupling between the terminal assembly 1221 and the electrode assembly 20 in the sealed cavity 10a. The electrolyte is injected from the liquid injection hole 122a on the second surrounding plate 122 and enters the sealed cavity 10a through the notch 112a on the first surrounding plate 112. The sealing assembly 13 can seal the liquid injection hole 122a on the second surrounding plate 122 after the electrolyte is injected.

[0076] It can be understood that when the first baffle 112 is adjacent to one end of the second side plate 121 and is close to the second side plate 121, the first baffle 112, the first side plate 111 and the second side plate 121 jointly define the sealed cavity 10a, and at this time, the notch 112a needs to be cut on the first baffle 112 to define the first avoiding space and the second avoiding space, so as to realize the avoiding of the tab 21 and the liquid injection hole 122a. When the first baffle 112 is adjacent to one end of the second side plate 121 and is far away from the second side plate 121, the first baffle 112, the second baffle 122, the first side plate 111 and the second side plate 121 jointly define the sealed cavity 10a, and at this time, there is no gap space 10b between the first baffle 112 and the second baffle 122, and the first baffle 112 does not interfere with the arrangement of the tab 21 and the liquid injection hole 122a, and the notch 112a does not need to be cut on the first baffle 112.

[0077] According to some embodiments of the present application, the first avoiding space and the second avoiding space are arranged in a spaced manner, and in some embodiments, the first avoiding space and the second avoiding space are communicated through the sealed cavity 10a, the sealed cavity 10a contains the electrode assembly 20 and the electrolyte, the terminal assembly 1221 is connected to the tab 21 of the electrode assembly 20 in the sealed cavity 10a through the through hole 122b on the second baffle 122 and the first avoiding space on the first baffle 112, the electrolyte is injected from the liquid injection hole 122a on the second baffle 122 and enters the sealed cavity 10a through the second avoiding space on the first baffle 112, and the sealing assembly 13 can seal the liquid injection hole 122a on the second baffle 122 after the electrolyte is injected.

[0078] According to some embodiments of the present application, as shown in Figures 1-2 , a part of the sealing assembly 13 is inserted into the liquid injection hole 122a to seal the liquid injection hole 122a; or the sealing assembly 13 comprises a spacing part 131 and a connecting part 132, the spacing part 131 and the connecting part 132 are connected at an angle, the spacing part 131 is arranged in a spaced manner with the liquid injection hole 122a, and the connecting part 132 is fixed to the second baffle 122. Specifically, in some embodiments, the sealing assembly 13 can be an integrally formed piece or a combined structure. The integrally formed sealing assembly 13 can be a column structure as shown in Figure 10 and Figure 11 , as shown in Figure 10 , one surface of the sealing assembly 13 of the column structure abuts against the liquid injection hole 122a to seal the liquid injection hole 122a; as shown in Figure 11 , the sealing assembly 13 of the column structure can be inserted into the liquid injection hole 122a to seal the liquid injection hole 122a. The integrally formed sealing assembly 13 can also be configured as a stepped structure with a protrusion as shown in Figure 12 , or as shown in Figure 13The protruding part of the illustrated one-piece stamping formed boss structure can extend into the liquid injection hole 122a to seal the liquid injection hole 122a and define the position of the sealing assembly 13, and the connecting part 132 of the sealing assembly 13 can be fixedly connected with the second surrounding plate 122 by welding, bonding, thermal attachment, or the like. The combined structure of the sealing assembly 13 can be a combination of a metal sealing sheet and a sealing element, wherein the sealing element includes but is not limited to a perfluoroalkoxy (PFA), polypropylene, or the like, and the combined structure of the sealing assembly 13 can also be a two-part structure of a metal sealing sheet and a sealing element as shown in the figure, and the two parts together complete the sealing of the liquid injection hole 122a. Figure 14 The combined structure of the sealing assembly 13 can be a combination of a metal sealing sheet and a sealing element, wherein the sealing element includes but is not limited to a perfluoroalkoxy (PFA), polypropylene, or the like, and the combined structure of the sealing assembly 13 can also be a two-part structure of a metal sealing sheet and a sealing element as shown in the figure, and the two parts together complete the sealing of the liquid injection hole 122a.

[0079] In some embodiments, the thickness of the plate material of the first shell 11 is in the range of 30-300 μm, and the thickness of the plate material of the second shell 12 is in the range of 30-300 μm. For example, the thickness of the plate material of the first shell 11 can be 30 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, or the like, and the thickness of the plate material of the second shell 12 can be 30 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, or the like. The thickness of the first shell 11 and the second shell 12 is in the range of 30-300 μm, which can ensure a low weight of the battery 1 while ensuring the structural strength of the battery shell 10.

[0080] In some embodiments, the battery shell 10 is a metal battery shell 10, and the first shell 11 and the second shell 12 are both made of steel (including but not limited to stainless steel, nickel-plated steel, or the like), and the first shell 11 and the second shell 12 are both formed by one-piece stretch forming. It can be understood that the thickness of the plate material of the first shell 11 and the second shell 12 is in the range of 30-300 μm. Since the minimum thickness of the steel material in the industry can reach 15 μm, but the steel material needs to be stretched by 3-5 mm to make the first shell 11 and the second shell 12, and under the current technology, the steel material with a thickness of less than 50 μm stretched to 5 mm has a risk of breaking, and the steel material with a thickness of less than 30 μm has low feasibility for making the battery shell 10.

[0081] In some embodiments, the projection of the first side plate 111 and / or the second side plate 121 in the direction from the first side plate 111 to the second side plate 121 is a rectangle, and at least one of the four right angle regions of the rectangle is provided with an anti-explosion notch to break and release pressure when the pressure in the sealed cavity 10a is too high, ensuring the safety of the battery 1 in use.

[0082] The present application will be described in detail below with reference to specific examples and Tables 1-2. It should be noted that the following examples are intended to illustrate the present application and should not be construed as limiting the scope of the present application. Unless otherwise specified, the techniques or conditions in the examples are in accordance with those described in the literature or in accordance with the product manual. Unless otherwise specified, the reagents or instruments used are conventional products that can be obtained commercially.

[0083] Example 1

[0084] A first shell 11 including a first side plate 111 and a first surrounding plate 112 connected at an angle to the outer edge of the first side plate 111, and a second shell 12 including a second side plate 121 and a second surrounding plate 122 connected at an angle to the outer edge of the second side plate 121 are provided, with the first surrounding plate 112 inside the second surrounding plate 122, and the first surrounding plate 112 and the second surrounding plate 122 being sealed and fitted by a weld metal layer 30, wherein the thickness of the second surrounding plate 122 is 75 μm.

[0085] Examples 2-12

[0086] Most of the structures in Example 1 are included, except that a gap space 10b is provided between the outer peripheral wall of the first surrounding plate 112 and the inner peripheral wall of the second surrounding plate 122, and at least part of the weld metal layer 30 is located in the gap space 10b, and the gap space 10b width, the thickness of the second surrounding plate 122, and the height of the part of the weld metal layer 30 fitted to the outer peripheral wall of the first surrounding plate 112 are provided in accordance with Examples 2-12 in Table 1.

[0087] Comparative Example 1

[0088] The first shell of Comparative Example 1 is a flat plate structure provided with a first flange, and the second surrounding plate of the second shell is provided with a second flange protruding away from the second shell, and the first flange and the second flange are welded and connected, wherein the thickness of the first flange and the second flange is 75 μm.

[0089] Comparative Example 2

[0090] The first shell of Comparative Example 2 is a flat plate structure provided with a first flange, and the second surrounding plate of the second shell is provided with a second flange protruding away from the second shell, and the first flange and the second flange are welded and connected, wherein the thickness of the first flange and the second flange is 200 μm.

[0091] Comparative Example 3

[0092] The battery case 10 structure includes most of the structure in Embodiment 1, which is different in that the first and second surrounding plates 112 and 122 are bonded together so that the first and second casings 11 and 12 define a sealed cavity 10a, wherein the thickness of the second surrounding plate 122 is 75 μm.

[0093] Table 1

[0094]

[0095] The electrode assemblies were assembled in the battery cases provided by Examples 2-12 and Comparative Examples 1-3 to prepare batteries, which were subjected to the following performance tests:

[0096] Test One, Energy Density Test. The batteries prepared from Examples 2-12 and Comparative Examples 1-3 were fully charged at 1C rate and fully discharged at 1C rate at 25°C, and the actual discharge energy at this time was recorded. The batteries were weighed using an electronic balance at 25°C. The ratio of the actual discharge energy of the battery to the volume of the battery was the actual energy density of the battery.

[0097] Test Two, Sealing Performance Test. The batteries were placed in a sealed test chamber and positioned, the battery liquid injection hole position was sealed, and the sealed cavity was vacuumed. Subsequently, the sealed test chamber was vacuumed, and the battery was filled with helium gas at a sufficient pressure. After a certain period of pressure maintenance, the helium content in the sealed test chamber was detected to determine whether the battery leaked. The judgment standard was 1.0*10 - 7 pa·m 3 / s. The battery samples in each test group were 20, and the qualified samples in the 20 samples met the judgment standard. The helium detection qualified rate = the number of qualified samples / 20.

[0098] Test Three, Sealing Strength Test. The sealing area sample with a width W1 (exemplarily, W1 can be 10 mm) was taken, a multifunctional tensile tester was used, the clamps clamped the materials on both sides of the sealing area, the stretching speed was 50 mm / min, and the test was performed to obtain the peeling force P1 of the weld metal layer 30. The sealing strength F of the weld metal layer 30 to the gap space 10b = P1 / W1.

[0099] Test Four, Space Utilization Rate Test. The length and width data of the battery in the plane can be measured using an image instrument, the thickness data of the battery can be measured using a PPG soft package battery thickness gauge, and the thickness of the second surrounding plate can be measured using a micrometer. The space occupied by the electrode assembly in the battery is the effective space of the battery, and the theoretical calculation formula of the effective space utilization rate of the battery is: the effective space utilization rate of the battery = 1- (the volume of the battery case + the volume of the gap space) / the volume of the battery.

[0100] The results of the above four tests are shown in Table 2 below.

[0101] Table 2

[0102]

[0103] From Table 2, it can be seen that the battery shell of the comparative example 1 has a large proportion of the volume of the battery, and the electrode assembly can be arranged in a small space, and the energy density of the battery is low. The thickness of the first and second flanges of the comparative example 2 is greater than that of the comparative example 1, and the volume of the battery shell occupies a larger proportion of the volume of the battery, so the energy density of the battery is lower.

[0104] Since the first and second surrounding plates 112 and 122 of the examples 1-12 and the comparative example 3 are connected and matched, the energy density of the battery 1 of the examples 1-5, 7-12 and the comparative example 3 is higher than that of the comparative example 1. Since the thickness of the second surrounding plate 122 of the example 6 is thicker, the energy density of the example 6 is higher than that of the comparative example 2 with the same thickness of the flange. However, the first and second surrounding plates 112 and 122 of the examples 1-12 are welded by the weld metal layer 30, and the first and second surrounding plates 112 and 122 of the comparative example 3 are bonded, so the sealing strength and sealing performance of the battery 1 are poor.

[0105] When the gap space 10b is narrow, the energy density of the battery 1 is higher, and when the gap space 10b is too wide, the energy density of the battery 1 is lower, and the sealing performance and sealing strength are poor.

[0106] When the second surrounding plate 122 is thicker, the battery shell 10 occupies a larger volume of the battery 1, resulting in a smaller space for the electrode assembly 20, and the energy density of the battery 1 is smaller. When the second surrounding plate 122 is too thin, the sealing performance and sealing strength of the battery 1 are poor.

[0107] When the height of the weld metal layer 30 and the first surrounding plate 112 is too small, the sealing performance and sealing strength of the battery 1 are poor, and when the height of the weld metal layer 30 and the first surrounding plate 112 is too large, the overall weight of the battery 1 is increased, affecting the lightweight of the battery 1.

[0108] The battery 1 according to the present application will be described briefly below.

[0109] As Figure 1 , Figure 5 , Figure 9As shown, the battery 1 according to the present application comprises: a battery shell 10 configured as the battery shell 10 in any of the above embodiments; and an electrode assembly 20 arranged in the sealed cavity 10a. In some embodiments of the present application, the first surrounding plate 112 of the first shell 11 can be arranged inside the second surrounding plate 122 of the second shell 12, and the outer peripheral wall of the first surrounding plate 112 is located inside the inner peripheral wall of the second surrounding plate 122 to define a gap space 10b, a part of the weld metal layer 30 is located between the free end of the second surrounding plate 122 and the outer peripheral wall of the first surrounding plate 112, and another part of the weld metal layer 30 is located in the gap space 10b to weld and connect the first surrounding plate 112 and the second surrounding plate 122, so that the first side plate 111, the second side plate 121, the first surrounding plate 112 and the second surrounding plate 122 jointly define the sealed cavity 10a. The sealed cavity 10a contains the electrode assembly 20 and the electrolyte, wherein the electrode assembly 20 is a stacked electrode and comprises a cathode layer, an anode layer and a separator layer arranged between the cathode layer and the anode layer, the second surrounding plate 122 is provided with a through hole 122b and a liquid injection hole 122a, and the terminal assembly 1221 is connected to the electrode assembly 20 in the sealed cavity 10a through the through hole 122b, and the sealing assembly 13 seals the sealed cavity 10a through the liquid injection hole 122a. One end of the first surrounding plate 112 in the length direction is provided with a notch 112a, the tab 21 of the electrode assembly 20 extends out of the notch 112a and is connected to the terminal assembly 1221 on the second surrounding plate 122, and the first shell 11 can be connected with the second shell 12 through the tab 21 and flipped to cooperate with the second shell 12.

[0110] The battery 1 of the present application is welded and connected between the outer peripheral wall of the first surrounding plate 112 and the inner peripheral wall of the second surrounding plate 122 to seal the gap between the first shell 11 and the second shell 12, seal the battery 1, reduce the volume of the battery 1, avoid occupying too much assembly space, and the operation of welding and connecting the first surrounding plate 112 and the second surrounding plate 122 to seal the battery 1 is simple, the realization degree is high, the steps of manufacturing the battery 1 are simple and easy to realize, and the manufacturing cost of the battery 1 is lower.

[0111] The power consuming device according to the present application is briefly described below.

[0112] The power consuming device according to the present application comprises the battery 1 in any of the above embodiments, and the battery 1 is used to provide electric energy. Since the power consuming device according to the present application is provided with the battery 1 in the above embodiments, the capacity of the battery 1 of the power consuming device is higher, and the endurance is stronger.

[0113] In summary, the battery case 10 according to the present application sets the weld metal layer 30 between the first surrounding plate 112 and the second surrounding plate 122 to perform the welding fit, realizes the connection of the first case 11 and the second case 12, can reduce the proportion of the space volume of the battery case 10 in the assembly space, and can avoid the battery 1 from occupying too much assembly space in the electric device, so as to arrange other electronic components in the electric device. The assembly space in the electric device can be fully utilized, and in the case that the proportion of the space volume of the battery 1 in the assembly space is determined, the smaller the volume of the battery case 10, that is, the smaller the proportion of the space volume of the battery case 10 in the assembly space, the larger the space in which the electrode assembly 20 can be arranged, that is, the larger the volume of the electrode assembly 20, the proportion of the electrode assembly 20 in the assembly space in the battery 1 can be improved, and thus the effective capacity and the energy density of the battery 1 can be improved.

[0114] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0115] Although the embodiments of the present application have been shown and described above, the above embodiments can be changed, modified, replaced and varied.

Claims

1. A battery casing, characterized in that, include: A first housing (11) and a second housing (12), the first housing (11) including a first side plate (111) and a first enclosure plate (112), the first enclosure plate (112) being connected at an angle to the outer edge of the first side plate (111), the second housing (12) including a second side plate (121) and a second enclosure plate (122), the second enclosure plate (122) being connected at an angle to the outer edge of the second side plate (121), the first enclosure plate (112) being disposed inside the second enclosure plate (122), the first enclosure plate (112) and the second enclosure plate (122) being adapted to a sealing fit so that the first housing (11) and the second housing (12) define a sealed cavity (10a); wherein The first enclosure (112) and the second enclosure (122) are adapted to be sealed together by a weld metal layer (30); A gap space (10b) is provided between the outer peripheral wall of the first enclosure (112) and the inner peripheral wall of the second enclosure (122), and at least a portion of the weld metal layer (30) is located within the gap space (10b); In the interval direction from the first enclosure (112) to the second enclosure (122), the width of the gap space (10b) is A, in μm, and the thickness of the second enclosure (122) is T, in μm; In the direction from the first side plate (111) to the second side plate (121), the height of the portion of the weld metal layer (30) that mates with the outer peripheral wall of the first enclosure plate (112) is B, in μm; in The width of the gap space (10b), the thickness of the second enclosure plate (122), and the height of the portion of the weld metal layer (30) that mates with the outer peripheral wall of the first enclosure plate (112) satisfy the following relationship: 。 2. The battery casing according to claim 1, characterized in that, At least a portion of the weld metal layer (30) is located between the end of the second enclosure (122) adjacent to the first side plate (111) and the outer peripheral wall of the first enclosure (112).

3. The battery casing according to claim 1, characterized in that, The width of the gap space (10b), the thickness of the second enclosure plate (122), and the height of the portion of the weld metal layer (30) that mates with the outer peripheral wall of the first enclosure plate (112) satisfy the following: .

4. The battery casing according to claim 1, characterized in that, The width of the gap space (10b) satisfies: 0 < A ≤ 100 μm, the thickness of the second enclosure plate (122) satisfies: 20 μm ≤ T ≤ 200 μm, and the height of the portion of the weld metal layer (30) that mates with the outer peripheral wall of the first enclosure plate (112) satisfies: 50 μm ≤ B ≤ 800 μm.

5. The battery casing according to claim 3, characterized in that, The width of the gap space (10b) satisfies: 0 < A ≤ 30 μm, the thickness of the second enclosure plate (122) satisfies: 20 μm ≤ T ≤ 100 μm, and the height of the portion of the weld metal layer (30) that mates with the outer peripheral wall of the first enclosure plate (112) satisfies: 150 μm ≤ B ≤ 400 μm.

6. The battery casing according to claim 1, characterized in that, The first enclosure panel (112) is perpendicular to the first side panel (111); and / or The second enclosure (122) is perpendicular to the second side panel (121).

7. The battery casing according to claim 1, characterized in that, A first rounded corner is formed between the first enclosure panel (112) and the first side panel (111); and / or A second rounded corner is formed between the second enclosure (122) and the second side panel (121).

8. The battery casing according to claim 1, characterized in that, The distance between the end of the second enclosure (122) adjacent to the first side panel (111) and the second side panel (121) is less than the distance between the first side panel (111) and the second side panel (121).

9. The battery casing according to claim 1, characterized in that, The second enclosure (122) is provided with a terminal assembly (1221), and the first enclosure (112) is provided with a first clearance space. The terminal assembly (1221) is arranged opposite to the first clearance space.

10. The battery casing according to claim 9, characterized in that, The second enclosure (122) is provided with an injection hole (122a), and the first enclosure (112) is provided with a second clearance space that is directly opposite to the injection hole (122a). The injection hole (122a) is connected to the sealed cavity (10a) through the second clearance space. The battery casing (10) also includes a sealing assembly (13) for sealing the injection hole (122a).

11. The battery casing according to claim 10, characterized in that, The first enclosure (112) has a notch (112a) on the side facing the terminal assembly (1221) and the injection hole (122a) to define the communicating first clearance space and second clearance space.

12. The battery casing according to claim 10, characterized in that, The first clearance space and the second clearance space are set at intervals.

13. The battery casing according to claim 10, characterized in that, A portion of the sealing assembly (13) is inserted into the injection port (122a) to seal the injection port (122a); or The sealing assembly (13) includes a spacer (131) and a connecting part (132), the spacer (131) and the connecting part (132) are connected at an angle, the spacer (131) is spaced apart from the injection hole (122a), and the connecting part (132) is fixed to the second enclosure plate (122).

14. A battery, characterized in that, include: Battery housing (10), the battery housing (10) being constructed as claimed in any one of claims 1-13. Electrode assembly (20) is disposed in the sealed cavity (10a).

15. An electrical appliance, characterized in that, Includes the battery (1) according to claim 14, the battery being used to provide electrical energy.

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