Battery, battery pack and electric equipment

Abstract

The invention provides a battery, a battery pack and electric equipment, the battery comprises a shell, a pole core and a functional component, the shell comprises a first shell wall and an adapter, the pole core is arranged in the shell, the pole core comprises a pole core body and a first tab which are connected with each other, the first tab is fixedly connected with the first shell wall, the adapter is fixedly connected with the first shell wall, and the functional component is fixedly connected with the first shell wall. The functional assembly comprises a first connecting end, and the first connecting end is fixedly connected with the side, away from the first shell wall, of the adapter. The orthographic projection of the first tab in the first direction and the orthographic projection of the first connecting end in the first direction at least partially coincide. The battery provided by the invention is relatively good in welding performance and relatively small in internal resistance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, a battery pack and an electrical device. Background Art

[0002] In existing technology, a battery consists of a cell and a casing. The casing has a cavity for holding the cell and electrolyte. The cell has positive and negative tabs. In solutions where the casing is charged, one tab is welded to the casing, while the other is connected to the terminal. The battery typically includes a PCM board assembly to connect the battery to the end product and power it. The two connection ends of the PCM board assembly need to be connected to the casing and the terminal, respectively, to ensure electrical continuity between the PCM board assembly and the cell.

[0003] Since the shell is thin, in order to avoid the shell being welded through, the welding positions of the tabs and the shell and the welding positions of the connection ends and the shell need to be staggered by a certain distance. However, this will increase the current transmission path and thus increase the internal resistance of the battery, resulting in greater current transmission loss. Summary of the Invention

[0004] Based on this, the present application provides a battery, a battery pack and an electrical device, which locally reinforces the first shell wall by arranging an adapter between the first shell wall and the first connection end, thereby improving the welding performance of the first shell wall, and making the projection of the first pole ear along the first direction and the projection of the first connection end along the first direction at least partially overlap, thereby shortening the current transmission path between the first pole ear and the first connection end, thereby reducing the internal resistance of the battery, and thus reducing the current loss of the battery.

[0005] In a first aspect, the present application provides a battery, comprising:

[0006] The housing is provided with an accommodating cavity, and the housing includes a first housing wall and an adapter; the adapter is fixedly connected to a side of the first housing wall away from the first tab, and the adapter protrudes from the first housing wall in a first direction;

[0007] The pole core is arranged in the accommodating cavity, and the pole core comprises a pole core body and a first pole tab which are connected to each other, and the first pole tab is fixedly connected to the first shell wall;

[0008] The functional component includes a first connecting end, the first connecting end being fixedly connected to a side of the adapter facing away from the first shell wall;

[0009] The orthographic projection of the first tab along the first direction and the orthographic projection of the first connecting end along the first direction at least partially overlap;

[0010] The first direction is along the thickness direction of the first shell wall.

[0011] In a possible implementation manner, an orthographic projection of the first connecting end along the first direction is located within an orthographic projection of the adapter along the first direction.

[0012] In a possible implementation, an orthographic projection of the first tab along the first direction coincides with an orthographic projection of the first connecting end along the first direction.

[0013] In a possible implementation, in the first direction, the first electrode tab, the first shell wall, the adapter, and the first connection end are sequentially arranged adjacent to each other, and a welding structure formed by welding is formed between at least some of the adjacent two portions.

[0014] In a possible implementation, the welding structure includes a first welding structure, a second welding structure, and a third welding structure;

[0015] The first welding structure connects the first electrode tab and the first shell wall, the second welding structure connects the first shell wall and the adapter, and the third welding structure connects the adapter and the first connection end.

[0016] In a possible implementation, orthographic projections of the first welding structure, the second welding structure, and the third welding structure in the first direction do not overlap.

[0017] In a possible implementation, a distance between two adjacent ones of the first welding structure, the second welding structure, and the third welding structure is greater than or equal to 0.5 mm.

[0018] In a possible implementation, an orthographic projection of the second welding structure along the first direction and an orthographic projection of the first connecting end along the first direction are staggered.

[0019] In a possible implementation, the first welding structure includes at least two first sub-welding structures, and the first sub-welding structures are arranged at intervals along the second direction and / or the third direction to connect the first electrode tab and the first shell wall;

[0020] And / or, the second welding structure includes at least two second sub-welding structures, and the second sub-welding structures are arranged at intervals along the second direction and / or the third direction to connect the adapter and the first shell wall;

[0021] And / or, the third welding structure includes at least two third sub-welding structures, and the third sub-welding structures are arranged at intervals along the second direction and / or the third direction to connect the adapter and the first connecting end;

[0022] The first direction, the second direction and the third direction are arranged at angles to each other.

[0023] In a possible implementation, the first sub-welding structure is disposed close to an edge of the first electrode tab.

[0024] In a possible implementation, the second sub-welding structure is disposed close to an edge of the adapter.

[0025] In one possible implementation, in a first direction, the first welding structure penetrates the first electrode tab and extends to the first shell wall. The first welding structure includes a first welding portion located at the first electrode tab and a second welding portion located at the first shell wall. The ratio of the penetration depth of the second welding portion to the thickness of the first shell wall is greater than or equal to 0.3:1 and less than or equal to 0.8:1.

[0026] And / or, the second weld structure penetrates the adapter and extends to the first shell wall, the second weld structure includes a third weld portion located on the adapter and a fourth weld portion located on the first shell wall, and a ratio of a penetration depth of the fourth weld portion to a thickness of the first shell wall is greater than or equal to 0.3:1 and less than or equal to 0.8:1;

[0027] And / or, the third welding structure passes through the first connection end and extends to the adapter, the third welding structure includes a fifth welding portion located at the first connection end and a sixth welding portion located at the adapter, and the ratio of the penetration depth of the sixth welding portion to the thickness of the adapter is greater than or equal to 0.3:1 and less than or equal to 0.8:1.

[0028] In a possible implementation, the pole core further includes a second pole tab, the second pole tab is connected to the pole core body, and the second pole tab has an opposite electrical polarity to the first pole tab;

[0029] The functional component further includes a substrate and a second connection end, wherein the first connection end and the second connection end are both connected to the substrate;

[0030] The battery further includes a pole, one end of which is connected to the second pole lug, and the other end of which passes through the first shell wall to be connected to the second connecting end.

[0031] In a possible implementation, the shell and the adapter are made of the same material.

[0032] In a possible implementation, the sum of the thickness of the first shell wall and the thickness of the adapter is greater than or equal to 0.2 mm.

[0033] In a second aspect, the present application provides a battery pack comprising the battery provided in the first aspect above.

[0034] In a third aspect, the present application provides an electrical device, comprising the battery provided in the first aspect or the battery pack provided in the second aspect, wherein the battery or the battery pack is used to power the electrical device.

[0035] The battery, battery pack, and electrical device provided in the present application include a housing, a core, an adapter, and a functional component. The housing includes a first housing wall, the core includes a core body and a first tab, and the functional component includes a first connection terminal. The core body is provided for storing or releasing electrical energy, the first tab is provided for leading out the positive or negative electrode of the core body, and the first tab is welded to the inner side of the first housing wall so that the first tab is conductively connected to the first housing wall, thereby conductively connecting the first housing wall to the core body. The functional component achieves a conductive connection between the battery and an external circuit. Compared to directly thickening the entire first housing wall, by providing an adapter between the first connection terminal and the first housing wall, the adapter protrudes from the first housing wall in the thickness direction of the first housing wall, thereby locally thickening the welded portion between the first connection terminal and the first housing wall. This increases the local strength of the housing, prevents welding penetration of the housing, and improves the welding performance of the housing. The first connecting end can be conductively connected to the first shell wall through an adapter, thereby conductively connecting the first pole ear and the first connecting end, thereby conductively connecting the functional component to the pole core, and, by making the projection of the first pole ear along the first direction and the projection of the first connecting end along the first direction at least partially overlap, the first pole ear and the first connecting end can be closer, thereby shortening the current transmission path between the first pole ear and the first connecting end, thereby reducing the internal resistance of the battery, thereby reducing the transmission loss of the battery.

[0036] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the batteries, battery packs, and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 It is a structural diagram of a battery in the related art;

[0039] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0040] Figure 3 Another structural schematic diagram of a battery provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the internal structure of a battery provided in an embodiment of the present application;

[0042] Figure 5 for Figure 4 A partial enlarged view of the dotted box;

[0043] Figure 6 for Figure 5 A partial enlarged view of the dotted circle in the middle;

[0044] Figure 7 A schematic diagram of the connection between the first shell wall, the adapter and the first connection end in the battery provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100-housing; 110-first housing wall;

[0047] 200-pole core; 210-pole core body; 220-first pole tab; 230-second pole tab;

[0048] 300-Adapter;

[0049] 400 - functional component; 410 - first connection end; 420 - substrate; 430 - second connection end;

[0050] 500-welding structure; 510-first welding structure; 510a-first sub-welding structure; 520-second welding structure; 520a-second sub-welding structure; 530-third welding structure; 530a-third sub-welding structure;

[0051] 600-pole. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0054] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0055] The terms "first," "second," and "third" (if any) in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can, for example, be implemented in orders other than those illustrated or described herein.

[0056] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0057] In existing technology, a battery consists of a cell and a casing. The casing has a cavity for holding the cell and electrolyte. The cell has positive and negative tabs. In solutions where the casing is charged, one tab is welded to the casing, while the other is connected to the terminal. The battery typically includes a PCM board assembly to connect the battery to the end product and power it. The two connection ends of the PCM board assembly need to be connected to the casing and the terminal, respectively, to ensure electrical continuity between the PCM board assembly and the cell.

[0058] Reference Figure 1As shown, during welding, the tab is welded to the inside of the shell at position A, and the connection end is welded to the outside of the shell at position B. Since the shell is thin, in order to avoid the shell being welded through, it is necessary to stagger the position A where the tab is welded to the shell and the position B where the connection end is welded to the shell by a certain distance. However, because the current needs to travel a certain distance from position A to position B, this will increase the current transmission path, thereby increasing the internal resistance of the battery, resulting in a larger current transmission loss.

[0059] In view of this, an embodiment of the present application provides a battery, a battery pack and an electrical device, by arranging an adapter between the first shell wall and the first connecting end to locally reinforce the first shell wall, thereby avoiding the first shell wall being welded through due to the thinness of the first shell wall, and making the projection of the adapter along the thickness direction of the first shell wall cover the projection of the first pole ear along the thickness direction of the first shell wall and the projection of the first connecting end along the thickness direction of the first shell wall, and making the projection of the first pole ear along the thickness direction of the first shell wall and the projection of the first connecting end along the thickness direction of the first shell wall at least partially overlap, thereby shortening the current transmission path between the first pole ear and the first connecting end, thereby reducing the internal resistance of the battery, and thus reducing the current loss of the battery.

[0060] The specific implementation methods of the battery, battery pack and electrical equipment provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0061] The electrical equipment provided in the embodiment of the present application includes an electrical device and a battery, and the battery is used to power the electrical device.

[0062] Exemplarily, the electrical device may be an electronic device such as a mobile phone or a tablet computer. An electronic device such as a mobile phone or a tablet computer may include electrical devices such as a central processing unit and a display screen. The electrical device has a battery compartment, and the battery can be installed in the battery compartment. The battery is conductively connected to the electrical device, thereby transmitting the current of the battery to the electrical device.

[0063] Alternatively, the electrical equipment provided in the embodiments of the present application includes an electrical device and a battery pack. The battery pack is used to power the electrical device. The battery pack may include at least two batteries. Relatively speaking, a single battery can only provide a relatively low voltage and a relatively short battery life. For electrical devices requiring a higher voltage, multiple batteries need to be integrated. Therefore, multiple batteries can form a battery pack with a higher voltage and a longer battery life. The battery pack then powers the electrical device.

[0064] For example, the electrical equipment may be a vehicle, the electrical device may be an electric motor, and the battery pack may provide electrical energy to the electric motor, thereby driving the vehicle. The vehicle may be a pure electric vehicle, an extended-range electric vehicle, a hybrid electric vehicle, or any other vehicle equipped with a battery pack.

[0065] Based on the above embodiment, the present application also provides a battery, referring to Figures 2 to 7 As shown, the battery provided in the embodiment of the present application includes a shell 100, a pole core 200 and a functional component 400, the shell 100 includes a first shell wall 110 and an adapter 300, the pole core 200 is arranged in the shell 100, the pole core 200 includes a pole core body 210 and a first pole ear 220 connected to each other, the first pole ear 220 is welded to the inner side of the first shell wall 110, the adapter 300 is fixedly connected to the outer side of the first shell wall 110, and the adapter 300 protrudes from the first shell wall 110 in a first direction, and the functional component 400 includes a first connection end 410, and the first connection end 410 is welded to the side of the adapter 300 facing away from the first shell wall 110.

[0066] The projection of the first electrode tab 220 along the first direction and the projection of the first connecting end 410 along the first direction at least partially overlap.

[0067] In this embodiment, the shell 100 is used to encapsulate the pole core 200 and the electrolyte, wherein the pole core 200 may include a pole core body 210, and the pole core body 210 may be composed of a positive electrode sheet, a diaphragm and a negative electrode sheet stacked in sequence, so that the lithium ions / sodium ions released by the positive electrode sheet migrate through the electrolyte and embed into the negative electrode sheet, thereby enabling the pole core body 210 to realize the discharge function, so that the pole core body 210 can supply power to the electrical device.

[0068] The pole core 200 can also be provided with a first pole ear 220 and a second pole ear 230, both of which are connected to the pole core body 210, and the electrical polarities of the first pole ear 220 and the second pole ear 230 are opposite, so that one of the first pole ear 220 and the second pole ear 230 is used to lead out the positive pole of the pole core body 210, and the other of the first pole ear 220 and the second pole ear 230 is used to lead out the negative pole of the pole core body 210.

[0069] For example, the first tab 220 is connected to the negative electrode sheet, thereby leading to the negative electrode of the electrode core body 210, and the second tab 230 is connected to the positive electrode sheet, thereby leading to the positive electrode of the electrode core body 210. For another example, the first tab 220 is connected to the positive electrode sheet, thereby leading to the positive electrode of the electrode core body 210, and the second tab 230 is connected to the negative electrode sheet, thereby leading to the negative electrode of the electrode core body 210.

[0070] Among them, the functional component 400 can be a circuit board component. It should be understood that since the battery may experience overcharging, over-discharging and short circuit during the charging and discharging process, all of these phenomena will have an adverse effect on the performance of the battery. Therefore, the circuit board component can be used to monitor the voltage, current or temperature of the battery, thereby ensuring that the battery operates within a safe operating range, thereby improving the performance of the battery.

[0071] Alternatively, the functional component 400 may be a connecting piece component, and multiple batteries may be connected in series or in parallel via the connecting piece component.

[0072] Alternatively, the functional component may be a sampling component, which may collect voltage signals and temperature signals of the battery to facilitate management of the working status of the battery.

[0073] In a specific implementation, in order to achieve conduction between the pole core body 210 and the functional component 400, the first pole ear 220 can be welded to the inner side of the first shell wall 110, and the first connection end 410 can be welded to the outer side of the first shell wall 110 through the adapter 300, thereby achieving conduction among the first pole ear 220, the first shell wall 110, the adapter 300 and the first connection end 410. In this way, the current can be transmitted in sequence through the pole core body 210, the first pole ear 220, the first shell wall 110, the adapter 300 and the first connection end 410, and then the current is transmitted to the electrical device.

[0074] That is, the first shell wall 110 has a welding area, and the first tab 220 and the first connecting end 410 are both welded to the welding area. Since the first shell wall 110 is relatively thin, welding the first connecting end 410 to the first shell wall 110 can easily cause the welding area to be penetrated. Therefore, an adapter 300 can be provided between the first connecting end 410 and the first shell wall 110. The adapter 300 can be integrally formed with the first shell wall 110, or the adapter 300 can be welded to the welding area of ​​the first shell wall 110.

[0075] In this way, the first connection end 410 is welded to the adapter 300, and the adapter 300 is welded or integrally formed with the first shell wall 110, so that the first connection end 410 is welded to the first shell wall 110 through the adapter 300. The adapter 300 can locally thicken the welding area, thereby improving the local strength of the welding area, thereby improving the structural strength of the battery.

[0076] For example, the sum of the thickness of the first shell wall 110 and the thickness of the adapter 300 may be greater than or equal to 0.2 mm, thereby effectively enhancing the local strength of the first shell wall 110 and thus improving the welding performance of the battery.

[0077] It can be understood that, since the adapter 300 is provided between the first shell wall 110 and the first connection end 410, and the projection of the first electrode tab 220 along the first direction and the projection of the first connection end 410 along the first direction at least partially overlap, in the second direction, the first electrode tab 220 and the first connection end 410 can be closer to each other, thereby shortening the current transmission path between the first electrode tab 220 and the first connection end 410.

[0078] For example, the projection of the first tab 220 along the first direction and the projection of the first connection end 410 along the first direction may partially overlap or completely overlap. In this way, compared with the related art, the transmission path of the current from the first tab 220 to the first connection end 410 is shorter, which is conducive to reducing the internal resistance of the battery and thus reducing the transmission loss of the battery.

[0079] The first shell wall 110 may be a rectangular sheet structure, the first direction may be the thickness direction of the first shell wall 110, and the first direction may refer to Figure 3 and Figure 6 The X direction in the second direction can refer to Figure 3 and Figure 6 in the Y direction.

[0080] The battery provided by the embodiment of the present application includes a shell 100, a pole core 200 and a functional component 400. The shell 100 includes a first shell wall 110 and an adapter 300. The pole core 200 includes a pole core body 210 and a first pole ear 220. The functional component 400 includes a first connection end 410. The pole core body 210 is provided for storing or releasing electrical energy, the first pole ear 220 is provided for leading out the positive or negative pole of the pole core body 210, the first pole ear 220 is welded to the inner side of the first shell wall 110 so that the first pole ear 220 is conductively connected to the first shell wall 110, and then the first shell wall 110 is conductively connected to the pole core body 210, the first connection end 410 is provided for conductively connecting to the pole core 200, and the adapter 300 is provided between the first connection end 410 and the first shell wall 110, thereby locally thickening the welding portion between the first connection end 410 and the first shell wall 110, thereby improving the local strength of the first shell wall 110. degree, thereby improving the welding performance of the first shell wall 110, and the first connection end 410 can be conductively connected to the first shell wall 110 through the adapter 300, thereby conductively connecting the first pole tab 220 and the first connection end 410, thereby conductively connecting the functional component 400 to the pole core 200, and by making the projection of the first pole tab 220 along the first direction and the projection of the first connection end 410 along the first direction at least partially overlap, so that the first pole tab 220 and the first connection end 410 can be closer, thereby shortening the current transmission path between the first pole tab 220 and the first connection end 410, thereby reducing the internal resistance of the battery, thereby reducing the transmission loss of the battery.

[0081] It should be noted that, in some embodiments, the adapter 300 and the first shell wall 110 can be processed separately and then welded together. In this way, compared with directly locally thickening the first shell wall 110, by arranging the adapter 300 between the first connecting end 410 and the first shell wall 110, the process of the first shell wall 110 can be simplified, and the adapter 300 can be flexibly arranged according to the position of the welding part between the first connecting end 410 and the first shell wall 110.

[0082] In one possible implementation, the projection of the first tab 220 along the first direction coincides with the projection of the first connecting end 410 along the first direction, and both the projection of the first tab 220 along the first direction and the projection of the first connecting end 410 along the first direction are located within the projection of the adapter 300 along the first direction.

[0083] This arrangement allows the projection of the first tab 220 along the first direction to coincide with the projection of the first connection end 410 along the first direction, shortening the distance between the first tab 220 and the first connection end 410 in the second direction. This in turn shortens the current transmission path between the first tab 220 and the first connection end 410, thereby reducing the internal resistance of the battery. Furthermore, the projection of the first tab 220 along the first direction lies within the projection of the adapter 300 along the first direction, allowing the adapter 300 to enhance the structural strength of the welded region of the first shell wall 110.

[0084] Taking into account the tolerances of processing and assembly, within the range allowed by the tolerance, the projection of the first pole tab 220 along the first direction and the projection of the first connecting end 410 along the first direction can completely overlap. In this way, the current can be transmitted from the first pole tab 220 to the first shell wall 110 without being transmitted along the second direction. The current is transmitted in the first direction in sequence along the first pole tab 220, the first shell wall 110, the adapter 300 and the first connecting end 410, which is more conducive to shortening the current transmission path between the first pole tab 220 and the first connecting end 410.

[0085] For example, in the second direction, the projection of the first tab 220 along the first direction and the projection of the first connecting end 410 along the first direction differ by ±1 mm. It can be considered that the projection of the first tab 220 along the first direction and the projection of the first connecting end 410 along the first direction completely overlap.

[0086] In some embodiments, the battery further includes at least one welding structure 500 , which connects at least two adjacently disposed ones of the first electrode tab 220 , the first shell wall 110 , the adapter 300 , and the first connection end 410 .

[0087] It is understandable that in the first direction, the first tab 220 , the first shell wall 110 , the adapter 300 and the first connection end 410 are arranged in sequence, and the first tab 220 , the first shell wall 110 , the adapter 300 and the first connection end 410 are arranged adjacent to each other.

[0088] In which, the welding structure 500 can connect the first electrode tab 220 and the first shell wall 110, or the welding structure 500 can connect the first electrode tab 220, the first shell wall 110 and the adapter 300, or the welding structure 500 can connect the first shell wall 110 and the adapter 300, or the welding structure 500 can connect the first shell wall 110, the adapter 300 and the first connection end 410, or the welding structure 500 can connect the adapter 300 and the first connection end 410, or the welding structure 500 can connect the first electrode tab 220, the first shell wall 110, the adapter 300 and the first connection end 410.

[0089] In this way, the welding structure 500 can at least weld and connect two, three or four of the first electrode tab 220, the first shell wall 110, the adapter 300 and the first connection end 410 that are adjacently arranged, thereby achieving a conductive connection between the first electrode tab 220, the first shell wall 110, the adapter 300 and the first connection end 410 that are adjacently arranged.

[0090] In a specific implementation, the welding structure 500 includes at least one of a first welding structure 510, a second welding structure 520 and a third welding structure 530. The first welding structure 510 at least connects the first electrode tab 220 and the first shell wall 110, the second welding structure 520 at least connects the first shell wall 110 and the adapter 300, and the third welding structure 530 at least connects the adapter 300 and the first connection end 410.

[0091] Illustratively, the welding structure 500 may include a first welding structure 510, which is used to connect the first electrode tab 220 and the first shell wall 110, thereby allowing the first electrode tab 220 to be welded to the inner side of the first shell wall 110, thereby electrically connecting the first electrode tab 220 to the first shell wall 110. Alternatively, the first welding structure 510 is used to connect the first electrode tab 220, the first shell wall 110, and the adapter 300, thereby allowing the first electrode tab 220 to be welded to the inner side of the first shell wall 110 and the adapter 300 to be welded to the outer side of the first shell wall 110, thereby electrically connecting the first electrode tab 220, the first shell wall 110, and the adapter 300.

[0092] For another example, the welding structure 500 may include a second welding structure 520, which is used to connect the first housing wall 110 and the adapter 300, thereby allowing the adapter 300 to be welded to the outside of the first housing wall 110, thereby achieving a conductive connection between the adapter 300 and the first housing wall 110. Alternatively, the second welding structure 520 is used to connect the first housing wall 110, the adapter 300, and the first connecting end 410, thereby allowing the first housing wall 110 and the first connecting end 410 to be welded to opposite sides of the adapter 300, thereby achieving a conductive connection between the first housing wall 110, the adapter 300, and the first connecting end 410.

[0093] For another example, the welding structure 500 may include a third welding structure 530, which is used to connect the adapter 300 and the first connection end 410, thereby allowing the first connection end 410 to be welded to the side of the adapter 300 facing away from the first housing wall 110, thereby achieving a conductive connection between the first connection end 410 and the adapter 300. Alternatively, the third welding structure 530 is used to connect the first housing wall 110, the adapter 300, and the first connection end 410, thereby allowing the first housing wall 110, the adapter 300, and the first connection end 410 to be connected sequentially in the first direction, thereby achieving a conductive connection between the first housing wall 110, the adapter 300, and the first connection end 410.

[0094] In some embodiments, a projection of the first tab 220 along the first direction and a projection of the adapter 300 along the first direction are located inside the other.

[0095] In other words, the projection of the first tab 220 along the first direction may be located within the projection of the adapter 300 along the first direction. In this way, the adapter 300 is larger, which facilitates welding of the adapter 300 to the first shell wall 110 and helps to expand the local thickening area of ​​the first shell wall 110, thereby improving the local strength of the first shell wall 110. Figure 6 As shown, in the second direction, the second welding structure 520 is located at the outermost side, the first welding structure 510 is located in the middle, and the third welding structure 530 is located at the innermost side, so as to improve the welding strength between the adapter 300 and the first shell wall 110 .

[0096] Alternatively, the projection of the adapter 300 along the first direction is located within the projection of the first tab 220 along the first direction. In this way, the adapter 300 is smaller, which helps reduce the material cost of the adapter 300. In this case, in the second direction, the first welding structure 510 is located at the outermost side, the second welding structure 520 is located in the middle, and the third welding structure 530 is located at the innermost side, so as to improve the welding strength between the first tab 220 and the first shell wall 110.

[0097] Alternatively, in some embodiments, within a tolerance range, the projection of the first tab 220 along the first direction and the projection of the adapter 300 along the first direction coincide with each other.

[0098] In some embodiments, in the second direction and the third direction, the first welding structure 510 , the second welding structure 520 , and the third welding structure 530 are staggered.

[0099] It should be noted that due to the high heat required for welding, the temperature is high during the process of forming the first welding structure 510, the second welding structure 520, and the third welding structure 530. If the temperature is too high, it will have an adverse effect on the performance of the pole core 200 and the functional component 400. Therefore, in the second direction and the third direction, the first welding structure 510, the second welding structure 520, and the third welding structure 530 can be staggered to reduce the impact of the welding process on the pole core 200 and the functional component 400. In addition, the first welding structure 510, the second welding structure 520, and the third welding structure 530 are staggered in the second direction and the third direction to avoid overlapping of two or three of the first welding structure 510, the second welding structure 520, and the third welding structure 530, thereby avoiding the phenomenon of weld-through.

[0100] In a possible implementation, in the length direction of the first shell wall 110 , the minimum distance between two adjacent welding structures 500 is greater than or equal to 0.5 mm.

[0101] It can be understood that the first shell wall 110 can be a rectangular thin sheet structure, the side length direction of the first shell wall 110 can be the second direction, and the side length direction of the first shell wall 110 can also be the third direction. In other words, in the second direction and the third direction, the two adjacent welding structures 500 are staggered to avoid overlapping of the welding structures 500, thereby avoiding welding through, and the minimum spacing between the two adjacent welding structures 500 is greater than or equal to 0.5 mm, thereby optimizing the distribution position of the welding structure 500 so that the stress generated by welding is more evenly distributed, thereby improving the overall strength and stability of the battery.

[0102] Among them, the third direction can refer to Figure 7 The Z direction in .

[0103] like Figure 6 As shown, in the second direction, the second welding structure 520, the first welding structure 510, the third welding structure 530, the third welding structure 530, the first welding structure 510 and the second welding structure 520 are arranged in sequence from left to right, and the spacing between any two adjacent ones of the second welding structure 520, the first welding structure 510, the third welding structure 530, the third welding structure 530, the first welding structure 510 and the second welding structure 520 can be greater than or equal to 0.5 mm.

[0104] The welding structure 500 may be a welding point, such as Figure 7 As shown, the projection shapes of the first welding structure 510, the second welding structure 520 and the third welding structure 530 along the first direction are all point-shaped, that is, the first welding structure 510, the second welding structure 520 and the third welding structure 530 can all be formed by laser spot welding. In the third direction, multiple second welding structures 520 are arranged in sequence, and the spacing between two adjacent second welding structures 520 can be greater than or equal to 0.5 mm. Multiple third welding structures 530 are arranged in sequence, and the spacing between two adjacent third welding structures 530 can be greater than or equal to 0.5 mm.

[0105] It is understandable that the welding structure 500 may also be a welding seam, that is, the projection shape of the welding structure 500 along the first direction may also be linear, for example, straight or wavy, and this embodiment of the present application is not limited to this.

[0106] The distance between two adjacent welding structures 500 can be understood as the distance between the edges of the two adjacent welding structures 500 on the sides close to each other.

[0107] In a possible implementation, a projection of the second welding structure 520 along the first direction and a projection of the first connecting end 410 along the first direction are staggered.

[0108] It should be noted that in order to optimize the processing flow of the battery, the first pole tab 220 and the first shell wall 110 can be welded from the side of the first pole tab 220 away from the first shell wall 110 to form a first welding structure 510, and then the pole core 200 is installed in the shell 100, and then the adapter 300 and the first shell wall 110 are welded from the side of the adapter 300 away from the first shell wall 110 to form a second welding structure 520, and then the first connection end 410 and the adapter 300 are welded from the side of the first connection end 410 away from the adapter 300 to form a third welding structure 530.

[0109] Since a welding protrusion is formed on the side of the second welding structure 520 facing the first connection end 410, thereby affecting the flatness of the side of the adapter 300 facing the first connection end 410, if the projection of the second welding structure 520 along the first direction is located within the projection of the first connection end 410 along the first direction, the welding protrusion of the second welding structure 520 will affect the fit of the overlapping portion of the adapter 300 and the first connection end 410, thereby affecting the welding of the adapter 300 and the first connection end 410.

[0110] Therefore, in the above-mentioned setting method, the projection of the second welding structure 520 along the first direction and the projection of the first connection end 410 along the first direction can be staggered with each other, that is, the projection of the second welding structure 520 along the first direction is located outside the projection of the first connection end 410 along the first direction, thereby making the second welding structure 520 and the third welding structure 530 staggered, and avoiding the welding protrusion of the second welding structure 520 affecting the welding of the adapter 300 and the first connection end 410.

[0111] like Figure 6 As shown, the first welding structure 510 is located at the overlapping portion of the first electrode tab 220 and the first shell wall 110, the third welding structure 530 is located at the overlapping portion of the first connection end 410 and the first shell wall 110, and the second welding structure 520 is located at the overlapping portion of the adapter 300 and the first shell wall 110. The projection of the first electrode tab 220 along the first direction substantially overlaps with the projection of the first connection end 410 along the first direction, and the projection of the second welding structure 520 along the first direction is located outside the projection of the first connection end 410 along the first direction. In this way, the original welding position of the first electrode tab 220 does not need to be changed, and the first welding structure 510, the second welding structure 520, and the third welding structure 530 can be staggered in the second direction.

[0112] In one possible implementation, in a first direction, the first welding structure 510 penetrates the first pole tab 220 and extends to the first shell wall 110. The first welding structure 510 includes a first welding portion located at the first pole tab 220 and a second welding portion located at the first shell wall 110. The ratio of the penetration depth of the second welding portion to the thickness of the first shell wall 110 is greater than or equal to 0.3:1 and less than or equal to 0.8:1, thereby ensuring that the first welding structure 510 has sufficient penetration depth, thereby reliably connecting the first pole tab 220 and the first shell wall 110.

[0113] In this way, welding can be performed from the side of the first electrode tab 220 facing away from the first shell wall 110 to the first shell wall 110, thereby forming a first welding structure 510. The first welding structure 510 penetrates the first electrode tab 220, but does not penetrate the first shell wall 110, thereby avoiding reducing the strength of the first shell wall 110 due to the first welding structure 510 welding through the first shell wall 110.

[0114] In the first direction, the second welding structure 520 passes through the adapter 300 and extends to the first shell wall 110. The second welding structure 520 includes a third welding portion located at the adapter 300 and a fourth welding portion located at the first shell wall 110. The ratio of the penetration depth of the fourth welding portion to the thickness of the first shell wall 110 is greater than or equal to 0.3:1 and less than or equal to 0.8:1, so that the second welding structure 520 has sufficient penetration depth, so that the second welding structure 520 can reliably connect the adapter 300 and the first shell wall 110.

[0115] In this way, welding can be performed from the side of the adapter 300 away from the first shell wall 110 to the first shell wall 110, thereby forming a second welding structure 520. The second welding structure 520 passes through the adapter 300, and the second welding structure 520 does not pass through the first shell wall 110, thereby avoiding reducing the strength of the first shell wall 110 due to the second welding structure 520 welding through the first shell wall 110, and at the same time ensuring the flatness of the side of the first shell wall 110 facing the pole core 200, avoiding adverse effects on the pole core body 210 and the first pole ear 220.

[0116] In the above-mentioned arrangement, the first welding structure 510, the second welding structure 520 and the third welding structure 530 are at least partially staggered in the first direction, thereby avoiding complete overlap of two or three of the first welding structure 510, the second welding structure 520 and the third welding structure 530 in the first direction, thereby reducing the thermal impact during the welding process, thereby avoiding deformation of the first electrode tab 220, the first shell wall 110, the adapter 300 or the first connection end 410.

[0117] In the first direction, the third welding structure 530 passes through the first connection end 410 and extends to the adapter 300. The third welding structure 530 includes a fifth welding portion located at the first connection end 410 and a sixth welding portion located at the adapter 300. The ratio of the penetration depth of the sixth welding portion to the thickness of the adapter 300 is greater than or equal to 0.3:1 and less than or equal to 0.8:1, so that the third welding structure 530 has sufficient penetration depth, so that the third welding structure 530 can reliably connect the adapter 300 and the first connection end 410.

[0118] In this way, welding can be performed from the side of the first connection end 410 away from the adapter 300 to the adapter 300, thereby forming a second welding structure 520. The second welding structure 520 passes through the first connection end 410. Since the second welding structure 520 has passed through the adapter 300, the third welding structure 530 does not pass through the adapter 300, thereby avoiding reducing the strength of the adapter 300 due to the third welding structure 530 welding through the adapter 300.

[0119] In some embodiments, the second electrode tab 230 and the first electrode tab 220 are spaced apart from each other along the second direction.

[0120] The functional component 400 also includes a substrate 420 and a second connection end 430, the first connection end 410 and the second connection end 430 are both connected to the substrate 420, the battery also includes a pole 600, the first shell wall 110 has a pole hole, the pole 600 is inserted into the pole hole, one end of the pole 600 is connected to the second pole ear 230, and the other end of the pole 600 is connected to the second connection end 430.

[0121] In this configuration, the first connection end 410 is conductively connected to the first pole ear 220 through the first shell wall 110 and the adapter 300, the second connection end 430 is conductively connected to the pole 600, and both the first connection end 410 and the second connection end 430 are conductively connected to the substrate 420, thereby conductively connecting the functional component 400 to the pole core 200.

[0122] It can be understood that when the functional component 400 is a circuit board component, the functional component 400 can monitor the current, voltage, etc. of the pole core 200, and the substrate 420 can be conductively connected to the electrical device, thereby transmitting the current of the pole core 200 to the electrical device through the functional component 400.

[0123] In one possible implementation, the housing 100 comprises a titanium alloy material. In other words, the housing 100 can be made of a titanium alloy. This helps reduce the weight of the housing 100, thereby reducing the weight of the battery. Furthermore, due to the high strength of the titanium alloy, the structural strength of the housing 100 is improved, thereby enhancing the drop resistance of the battery.

[0124] In addition, the thermal expansion coefficient of the titanium alloy material is relatively small, which facilitates the welding and forming of the various shell walls of the shell 100, as well as the welding of the first tab 220 and the first shell wall 110, and the welding of the adapter 300 and the first shell wall 110. During the welding process, the thermal impact on the welding parts of the shell 100 is small, and the shell 100 is not easily deformed, thereby improving the rigidity of the shell 100.

[0125] The first shell wall 110 and the adapter 300 are made of the same material to facilitate welding. For example, the first shell wall 110 and the adapter 300 can both be made of titanium alloy, or can also be made of stainless steel.

[0126] In some embodiments, the first welding structure 510 includes at least two first sub-welding structures 510 a , which are spaced apart along at least one of the second direction and the third direction to improve the welding strength between the first electrode tab 220 and the first shell wall 110 .

[0127] It can be understood that the first direction can be the thickness direction of the first shell wall 110, the second direction can be the length direction of the first shell wall 110, and the third direction can be the width direction of the first shell wall 110. The first direction, the second direction and the third direction are perpendicular to each other.

[0128] The projection of the first tab 220 along the first direction is the projection of the first tab 220 onto a reference plane perpendicular to the first direction. Since the first, second, and third directions are mutually perpendicular, the plane formed by the second and third directions is the reference plane. The at least two first sub-weld structures 510a being spaced apart along at least one of the second and third directions can be understood as being spaced apart on the reference plane.

[0129] For example, refer to Figure 6 As shown, the two first sub-welding structures 510a can be located on both sides of the first electrode tab 220 along the second direction. For another example, the two first sub-welding structures 510a can be located on both sides of the first electrode tab 220 along the third direction. For another example, the two first sub-welding structures 510a can be located on both sides of the first electrode tab 220 along the second direction, and the two first sub-welding structures 510a can be located on both sides of the first electrode tab 220 along the third direction, to reliably connect the first electrode tab 220 and the first shell wall 110.

[0130] In some embodiments, the second welding structure 520 includes at least two second sub-welding structures 520 a , which are spaced apart along at least one of the second direction and the third direction to improve the welding strength between the adapter 300 and the first shell wall 110 .

[0131] For example, refer to Figure 6 As shown, the two second sub-welding structures 520a are located on both sides of the adapter 300 along the second direction. Figure 7 As shown, among the six second sub-welding structures 520a, three second sub-welding structures 520a are arranged in a row along the third direction, and two rows of second sub-welding structures 520a are arranged in the second direction.

[0132] In some embodiments, the third welding structure 530 includes at least two third sub-welding structures 530 a , which are spaced apart along at least one of the second direction and the third direction to improve the welding strength between the adapter 300 and the first connection end 410 .

[0133] For example, refer to Figure 6 As shown, the two third sub-welding structures 530a are located on both sides of the first connection end 410 along the second direction. Figure 7As shown, among the four third sub-welding structures 530a, two third sub-welding structures 530a are arranged in a row along the second direction, and two rows of third sub-welding structures 530a are arranged in the third direction.

[0134] In one possible implementation, the first sub-welding structure 510a is arranged near the edge of the first pole tab 220, thereby improving the welding strength between the first pole tab 220 and the first shell wall 110, and the second sub-welding structure 520a is arranged near the edge of the adapter 300, thereby improving the welding strength between the adapter 300 and the first shell wall 110.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A housing (100) is provided with a receiving cavity, and the housing (100) includes a first housing wall (110) and an adapter (300), wherein the adapter (300) is fixedly connected to a side of the first housing wall (110) away from the first tab (220), and the adapter (300) protrudes from the first housing wall (110) in a first direction; A pole core (200), the pole core (200) being disposed in the accommodating cavity, the pole core (200) comprising a pole core body (210) and a first pole tab (220) connected to each other, the first pole tab (220) being fixedly connected to the first shell wall (110); A functional component (400), the functional component (400) comprising a first connection end (410), the first connection end (410) being fixedly connected to a side of the adapter (300) facing away from the first shell wall (110); The orthographic projection of the first electrode tab (220) along the first direction and the orthographic projection of the first connecting end (410) along the first direction at least partially overlap; The first direction is the thickness direction of the first shell wall (110).

2. The battery according to claim 1, characterized in that The orthographic projection of the first connecting end (410) along the first direction is located within the orthographic projection of the adapter (300) along the first direction.

3. The battery according to claim 1, characterized in that The orthographic projection of the first electrode tab (220) along the first direction coincides with the orthographic projection of the first connecting end (410) along the first direction.

4. The battery according to any one of claims 1 to 3, characterized in that In the first direction, the first electrode tab (220), the first shell wall (110), the adapter (300) and the first connection end (410) are arranged adjacent to each other in sequence, and a welding structure (500) is formed by welding between the two adjacent arrangements.

5. The battery according to claim 4, characterized in that The welding structure (500) includes a first welding structure (510), a second welding structure (520) and a third welding structure (530); The first welding structure (510) connects the first electrode tab (220) and the first shell wall (110), the second welding structure (520) connects the first shell wall (110) and the adapter (300), and the third welding structure (530) connects the adapter (300) and the first connection end (410).

6. The battery according to claim 5, characterized in that The orthographic projections of the first welding structure (510), the second welding structure (520) and the third welding structure (530) in the first direction do not overlap.

7. The battery according to claim 6, characterized in that The minimum spacing between two adjacently arranged ones of the first welding structure (510), the second welding structure (520) and the third welding structure (530) is greater than or equal to 0.5 mm.

8. The battery according to claim 5, characterized in that The orthographic projection of the second welding structure (520) along the first direction and the orthographic projection of the first connecting end (410) along the first direction are staggered.

9. The battery according to any one of claims 5 to 8, characterized in that: The first welding structure (510) includes at least two first sub-welding structures (510a), and the first sub-welding structures (510a) are arranged at intervals along the second direction and / or the third direction to connect the first electrode tab (220) and the first shell wall (110); And / or, the second welding structure (520) includes at least two second sub-welding structures (520a), and the second sub-welding structures (520a) are arranged at intervals along the second direction and / or the third direction to connect the adapter (300) and the first shell wall (110); And / or, the third welding structure (530) includes at least two third sub-welding structures (530a), and the third sub-welding structures (530a) are arranged at intervals along the second direction and / or the third direction to connect the adapter (300) and the first connecting end (410); The first direction, the second direction and the third direction are arranged at angles to each other.

10. The battery according to claim 9, characterized in that The first sub-welding structure (510a) is arranged close to the edge of the first electrode tab (220).

11. The battery according to claim 9, characterized in that The second sub-welding structure (520a) is arranged close to the edge of the adapter (300).

12. The battery according to any one of claims 5 to 8, characterized in that: In the first direction, the first welding structure (510) penetrates the first pole tab (220) and extends to the first shell wall (110), the first welding structure (510) comprises a first welding portion located at the first pole tab (220) and a second welding portion located at the first shell wall (110), and the ratio of the penetration depth of the second welding portion to the thickness of the first shell wall (110) is greater than or equal to 0.3:1 and less than or equal to 0.8:1; and / or, the second welding structure (520) passes through the adapter (300) and extends to the first shell wall (110), the second welding structure (520) comprises a third welding portion located on the adapter (300) and a fourth welding portion located on the first shell wall (110), and a ratio of a penetration depth of the fourth welding portion to a thickness of the first shell wall (110) is greater than or equal to 0.3:1 and less than or equal to 0.8:1; And / or, the third welding structure (530) passes through the first connecting end (410) and extends to the adapter (300), the third welding structure (530) includes a fifth welding portion located at the first connecting end (410) and a sixth welding portion located at the adapter (300), and the ratio of the penetration depth of the sixth welding portion to the thickness of the adapter (300) is greater than or equal to 0.3:1 and less than or equal to 0.8:

1.

13. The battery according to any one of claims 1 to 3, characterized in that: The pole core (200) further includes a second pole tab (230), wherein the second pole tab (230) is connected to the pole core body (210), and the second pole tab (230) has an opposite electrical polarity to the first pole tab (220); The functional component (400) further includes a substrate (420) and a second connection end (430), wherein the first connection end (410) and the second connection end (430) are both connected to the substrate (420); The battery further comprises a pole (600), one end of the pole (600) is connected to the second pole tab (230), and the other end of the pole (600) is connected to the second connection end (430).

14. The battery according to any one of claims 1 to 3, characterized in that: The housing (100) and the adapter (300) are made of the same material.

15. The battery according to any one of claims 1 to 3, characterized in that: The sum of the thickness of the first shell wall (110) and the thickness of the adapter (300) is greater than or equal to 0.2 mm.

16. A battery pack, characterized in that: Comprising the battery according to any one of claims 1 to 15.

17. An electrical device, characterized in that: It comprises an electrical device, a battery according to any one of claims 1 to 15, or a battery pack according to claim 16, wherein the battery or the battery pack is used to power the electrical device.

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