Battery cell, battery, and electric device

Abstract

The embodiment of the application provides a battery monomer, a battery and an electric equipment, and relates to the technical field of batteries. The battery monomer comprises a pole column assembly and a battery core; the battery core comprises a pole piece, and the pole piece is provided with a tab part; the tab part comprises a first laminated part and a second laminated part; when the tab part is welded with the pole column assembly, a bare leakage area is formed between the first laminated part and the second laminated part; the tab part has a first welding mark and a second welding mark with the pole column assembly; the first welding mark is formed on the first laminated part and the bare leakage area; and the second welding mark is formed on the second laminated part and the bare leakage area. The first laminated part and the second laminated part are welded with the pole column assembly through the first welding mark and the second welding mark respectively, so that the stability and reliability of the welding of the tab part and the pole column assembly can be improved. The first welding mark and the second welding mark extend into the bare leakage area, so that the case of false welding between the tab part and the pole column assembly can be avoided, and the use efficiency and safety of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell, a battery, and an electrical device. Background Technology

[0002] A single battery cell typically includes a terminal assembly and electrode plates. The terminal assembly includes the terminal body, or the terminal assembly includes the terminal body and an adapter plate. The electrode plates have tabs extending from their sides. The tabs are welded to the terminal body, or the tabs are welded to the adapter plate, and the adapter plate is then welded to the terminal body to achieve electrical conductivity between the tabs and the terminal body.

[0003] Tabs are usually formed by stacking multiple tab pieces in sequence. In some cases, the number of tab pieces is large, making the tabs thicker. This can easily lead to poor soldering when welding the tabs to the terminal block or adapter plate, which in turn affects the efficiency and safety of the battery cell. Utility Model Content

[0004] This application provides a battery cell, a battery, and an electrical device that can prevent poor soldering between the tab and the terminal body or electrical connection piece, thereby improving the efficiency and safety of the battery cell.

[0005] Firstly, embodiments of this application provide a single battery cell, comprising:

[0006] A housing, wherein the ends of the housing are provided with pole post assemblies;

[0007] A battery cell is housed within the housing; the battery cell includes an electrode plate, and one side of the electrode plate has a tab extending from the side of the electrode plate;

[0008] The tab portion includes a first stack portion and a second stack portion, the first stack portion and the second stack portion are spaced apart in a first direction, the first direction being the length direction of the electrode sheet; when the tab portion is welded to the electrode post assembly, the gap between the first stack portion and the second stack portion forms an exposed area for the electrode post assembly in a second direction, the second direction being perpendicular to the first direction and the thickness direction of the tab portion.

[0009] The tab portion and the electrode assembly have a first solder mark and a second solder mark; a portion of the first solder mark is formed at the first stack portion to weld the first stack portion to the electrode assembly, and another portion is formed at the electrode assembly corresponding to the exposed area along the second direction; a portion of the second solder mark is formed at the second stack portion to weld the second stack portion to the electrode assembly, and another portion is formed at the electrode assembly corresponding to the exposed area along the second direction.

[0010] Secondly, embodiments of this application provide a battery, comprising,

[0011] The box-shaped enclosure has a receiving cavity;

[0012] As described above, the battery cell is housed within the receiving cavity.

[0013] Thirdly, embodiments of this application provide an electrical device, including a battery cell as described above, or a battery as described above.

[0014] The battery cell, battery, and electrical device provided in this application embodiment improve the stability and reliability of the welding between the tab and the terminal body or electrical connector by dividing the tab into a first stacked portion and a second stacked portion spaced apart in a first direction, and by welding the first stacked portion and the second stacked portion to the terminal body or electrical connector piece respectively using a first solder mark and a second solder mark. The first solder mark and the second solder mark extend along the first direction into the exposed area and are formed on the terminal body or electrical connector piece corresponding to the exposed area along the second direction, which avoids the occurrence of incomplete soldering between the tab and the terminal body or electrical connector piece, thereby improving the efficiency and safety of the battery cell. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] Figure 1 A first schematic diagram illustrating the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application;

[0017] Figure 2 A second schematic diagram showing the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application;

[0018] Figure 3 A schematic diagram illustrating the welding of the first laminate to the electrical connection piece in some embodiments of this application;

[0019] Figure 4 A schematic diagram illustrating the welding of the second layer stack to the electrical connection piece in some embodiments of this application;

[0020] Figure 5 This is a third schematic diagram showing the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application;

[0021] Figure 6 A fourth schematic diagram showing the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application;

[0022] Figure 7This is a fifth schematic diagram illustrating the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application;

[0023] Figure 8 This is a schematic diagram of the tab provided in some embodiments of this application;

[0024] Figure 9 This is a schematic diagram showing that the tabs on the electrode sheet in some embodiments of this application are not welded to the electrical connection pieces;

[0025] Figure 10 This is a schematic diagram of the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application, and the second insulating layer covers the fifth side.

[0026] Figure 11 This is a schematic diagram of the welding of the electrode tab on the electrode sheet to the electrical connection piece in some embodiments of this application, and the second insulating layer covers the first solder mark and the second solder mark;

[0027] Figure 12 This is a schematic diagram of the electrode tab on the electrode sheet being welded to the electrical connection piece in some embodiments of this application, and the second insulating layer covers the exposed area.

[0028] Figure label:

[0029] 100. Electrode;

[0030] 200, tab; 210, first layer; 211, first side; 212, second side; 220, second layer; 221, third side; 222, fourth side; 230, connecting piece; 231, fifth side;

[0031] 300. Electrical connector;

[0032] 400, Exposed area; 410, First solder mark; 420, Second solder mark; 430, Third solder mark;

[0033] 500. First insulating layer;

[0034] 600. Second insulation layer.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0037] First, let me explain the terms used in this application:

[0038] Battery cell: It can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery cell, the active materials can be activated by charging after discharge and continue to be used. The battery cell includes a casing and a cell disposed inside the casing.

[0039] Housing: A housing is a component used to provide a space to house electrode assemblies and other parts and isolate them from the external environment. A housing generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Housing materials include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film.

[0040] Terminals: These are the "bridges" between the internal and external circuits of a battery. They are the core conductive components that connect the electrode assembly (positive / negative electrode) to external electrical appliances or charging devices. Their core function is to conduct the current generated by the electrochemical reaction inside the battery, or to introduce external current into the battery during charging. They are the key interface for realizing the input / output of electrical energy.

[0041] A battery cell is the component in a battery where electrochemical reactions occur; it is the smallest unit in a battery capable of performing electrochemical reactions such as charging and discharging. A battery cell is the basic unit of a battery and typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the movement of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0042] Tabs: Tabs are located on one side of the positive / negative current collector and are formed separately from or integrally with the current collector. They are electrically connected to the current collector to conduct current through the corresponding current collector. Tabs are made of a highly conductive metal material (such as copper, aluminum, or nickel).

[0043] Electrical connectors are key connection components in battery systems that enable current conduction between different components. Essentially, they are a type of "conductive bridge" and are mainly used to solve connection problems between different conductive units such as electrode assemblies, terminals, and external circuits within the battery or battery pack (e.g., size mismatch, misalignment, material differences, etc.), ensuring stable and low-loss current transmission between components.

[0044] Tab adhesive: It is applied to at least one side of the current collector near the tab, or to at least one side of the tab surface, to prevent short circuits between the tab and the opposite electrode; it can also prevent breakage due to bending of the tab during battery cell assembly. Tab adhesive mainly includes insulating materials such as PVDF (polyvinylidene fluoride), boehmite, polypropylene, and polyethylene.

[0045] A battery is a complete functional unit that directly outputs electrical energy. It consists of multiple individual battery cells connected in series and / or parallel to form a battery pack, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective parts. These components are housed in a casing and sealed with a cover. As a rechargeable battery, it is the power source for new energy vehicles. A battery generally includes cell modules, a battery management system (BMS) control module, and a casing that houses the cell modules and the BMS control module. The battery includes a casing and multiple individual battery cells housed within it. The casing is divided into upper and lower parts, which are sealed together.

[0046] Electrical equipment: Battery devices can serve as the operating power source for electrical equipment, or as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for vehicles. Electrical equipment includes: energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, aerospace and many other technological fields.

[0047] In related technologies, tabs are usually formed by stacking multiple tab sheets. As the demand for battery cell capacity increases in the market, the number of tab sheets in the battery cell also increases, making the tabs larger and thicker. This makes it easy for incomplete welding to occur when the tabs are welded to the terminal body or adapter piece, resulting in unreliable welding and affecting the efficiency and safety of the battery cell.

[0048] The battery cell, battery, and electrical device provided in this application, by dividing the tab portion into a first stacked portion and a second stacked portion spaced apart in a first direction, and by welding the first stacked portion and the second stacked portion to the terminal body or electrical connector piece respectively using a first solder mark and a second solder mark, can better improve the stability and reliability of the welding between the tab portion and the terminal body or electrical connector piece. The first solder mark and the second solder mark extend along the first direction into the exposed area and are formed on the terminal body or electrical connector piece corresponding to the exposed area along the second direction, which can avoid the occurrence of incomplete soldering between the tab portion and the terminal body or electrical connector piece, thereby improving the efficiency and safety of the battery cell.

[0049] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0050] In a first aspect, embodiments of this application provide a battery cell, which includes a housing and a battery cell. The housing has an inner cavity, and a terminal assembly is fixedly mounted on one side wall of the housing. In some cases, the terminal assembly includes a terminal body, or the terminal assembly includes a terminal body and an electrical connection piece 300. The battery cell is housed within the inner cavity of the housing; see also... Figure 1 As shown, the battery cell includes an electrode 100 wound along a first direction X, where the first direction X is the length direction of the electrode 100; a tab is provided on one side of the electrode 100 in the width direction, extending from the electrode 100, so that the tab is electrically connected to the electrode 100; there are multiple tabs on the electrode 100, and the multiple tabs are spaced apart on the electrode 100 along the first direction X, and as the electrode 100 is wound along the first direction X, at least some of the tabs can be stacked in a second direction Y and formed by welding to form a tab portion 200, wherein, see Figure 8 As shown, the second direction Y is perpendicular to the first direction X and is the thickness direction of the tab. When the electrode assembly includes the electrode body but excludes the electrical connector 300, the tab 200 is directly welded to the electrode body, thereby enabling electrical conduction between the electrode body and the tab 200. When the electrode assembly includes the electrode body and the electrical connector 300, the electrical connector 300 is located in the inner cavity, and the electrical connector 300 is welded to both the electrode body and the tab 200, thereby enabling electrical conduction between the electrode body and the tab 200 through the electrical connector 300.

[0051] To clearly illustrate the battery cell of the embodiments of this application, the following description will use the terminal assembly, which includes the terminal body and the electrical connection piece 300, as an example.

[0052] In the embodiments of this application, see Figure 1 and Figure 8 As shown, the tab portion 200 includes a first stack portion 210 and a second stack portion 220. The first stack portion 210 and the second stack portion 220 are spaced apart in the first direction X. When the tab portion 200 is soldered to the electrical connector 300, the gap between the first stack portion 210 and the second stack portion 220 can form a bare area 400 for the electrical connector 300 in the second direction Y, so that the electrical connector 300 can be directly seen through the bare area 400 in the second direction Y.

[0053] In the embodiments of this application, see Figure 1 As shown, when the tab 200 is soldered to the electrical connector 300, a first solder mark 410 is formed between the first stack 210 and the electrical connector 300, and a second solder mark 420 is formed between the second stack 220 and the electrical connector 300. A portion of the first solder mark 410 is located on the first stack 210 and is soldered to the electrical connector 300. Another portion of the first solder mark 410 extends along the first direction X into the exposed area 400 and is formed on the electrical connector 300 corresponding to the exposed area 400 along the second direction Y. A portion of the second solder mark 420 is located on the second stack 220 and is soldered to the electrical connector 300. Another portion of the second solder mark 420 extends along the first direction X into the exposed area 400 and is formed on the electrical connector 300 corresponding to the exposed area 400 along the second direction Y.

[0054] It is understood that in this embodiment, the tab portion 200 is divided into a first stack portion 210 and a second stack portion 220 spaced apart in the first direction X. By welding the first stack portion 210 and the second stack portion 220 to the electrical connector 300 respectively, the stability and reliability of the welding between the tab portion 200 and the electrical connector 300 can be better improved, avoiding the occurrence of poor welding between the tab portion 200 and the electrical connector 300, and improving the utilization efficiency and safety of the battery cell. In this embodiment, the first solder mark 410 is not only formed at a relatively central position of the first stack portion 210, but also extends in the first direction X to the boundary between the first stack portion 210 and the exposed area 400. That is, the first stack portion 210 is also welded to the electrical connector 300 along the side of the first direction X, thereby improving the stability and reliability of the welding between the first stack portion 210 and the electrical connector 300, avoiding the occurrence of poor welding between the first stack portion 210 and the electrical connector 300, and improving the utilization efficiency and safety of the battery cell. The efficiency and safety of the battery cell are improved; furthermore, the first solder mark 410 extends along the first direction X into the exposed area 400 and forms an electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y. By extending the first solder mark 410 at the junction of the first stack 210 and the exposed area 400, the electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y can help improve the stability of the first solder mark 410 and improve the welding effect between the first stack 210 and the electrical connection piece 300. In this embodiment, the second solder mark 420 is not only formed at a relatively central position on the second laminate 220, but also extends in the first direction X to the boundary between the second laminate 220 and the exposed area 400. That is, the side of the second laminate 220 along the first direction X is also soldered to the electrical connector 300. This improves the stability and reliability of the soldering between the second laminate 220 and the electrical connector 300, avoids incomplete soldering between them, and enhances... The efficiency and safety of the battery cell are improved; furthermore, the second solder mark 420 extends along the first direction X into the exposed area 400 and forms an electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y. By extending the second solder mark 420 at the junction of the second stack 220 and the exposed area 400, the electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y can help improve the stability of the second solder mark 420 and improve the welding effect between the first stack 210 and the electrical connection piece 300.

[0055] In some implementations, see Figure 2As shown, the first stack 210 has a first side 211 in the first direction X that is away from the second stack 220. The first solder mark 410 formed on the first stack 210 has a first distance H1mm between it and the first side 211 in the first direction X, where 5mm ≤ H1mm ≤ 15mm. Exemplarily, H1mm can be selected from 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm.

[0056] It is understandable that when the first distance H1mm is greater than 15mm, the first solder mark 410 is too close to the junction of the first stack 210 and the exposed area 400, which will affect the stability of the welding between the first stack 210 and the electrical connector 300 and easily lead to the separation of the first stack 210 and the electrical connector 300. This embodiment of the application, by limiting 5mm ≤ H1mm ≤ 15mm, can ensure that the first solder mark 410 has a better length on the first stack 210, thereby improving the welding effect between the first stack 210 and the electrical connector 300 and improving the structural stability of the first solder mark 410 at the junction of the first stack 210 and the exposed area 400.

[0057] In some implementations, see Figure 2 As shown, the first stack 210 has a second side 212 in the third direction Z, away from the electrode 100, wherein the third direction Z is perpendicular to the first direction X and the second direction Y, and the third direction Z is the width direction of the electrode 100. A second distance H2mm exists between the first solder mark 410 and the second side 212, wherein 5mm ≤ H2mm ≤ 20mm. Exemplarily, H2mm can be selected as 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0058] Understandably, when the second distance H2mm is less than 5mm, the distance between the first solder mark 410 and the second side 212 in the third direction Z is too small, making it difficult to weld the first layer stack 210 to the electrical connector 300, resulting in high welding difficulty. When the second distance H2mm is greater than 20mm, the distance between the first solder mark 410 and the electrode 100 in the third direction Z is too small, easily damaging the electrode 100, and also making it difficult to weld the first layer stack 210 to the electrical connector 300, resulting in high welding difficulty. This embodiment of the application limits H2mm to 20mm (5mm ≤ H2mm ≤ 20mm) so that the first solder mark 410 can be relatively centered in the third direction Z of the first layer stack 210, thereby facilitating the welding of the first layer stack 210 and the electrical connector 300.

[0059] In some implementations, see Figure 2 As shown, the second stack 220 has a third side 221 in the first direction X that is away from the first stack 210. The second solder mark 420 formed on the second stack 220 has a third distance H3mm between it and the third side 221 in the first direction X, where 5mm ≤ H3mm ≤ 15mm. Exemplarily, H3mm can be selected from 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm.

[0060] It is understandable that when the third distance H3mm is greater than 15mm, the second solder mark 420 is too close to the junction of the second stack 220 and the exposed area 400, which will affect the stability of the welding between the second stack 220 and the electrical connector 300 and easily lead to the separation of the second stack 220 and the electrical connector 300. This embodiment of the application, by limiting 5mm ≤ H3mm ≤ 15mm, can ensure that the second solder mark 420 has a better length on the second stack 220, thereby improving the welding effect between the second stack 220 and the electrical connector 300 and improving the structural stability of the second solder mark 420 at the junction of the second stack 220 and the exposed area 400.

[0061] In some implementations, see Figure 2 As shown, the second layer 220 has a fourth side 222 in the third direction Z, away from the electrode 100. A fourth distance H4mm exists between the second solder mark 420 and the fourth side 222, where 5mm ≤ H4mm ≤ 20mm. Exemplarily, H4mm can be selected from 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0062] Understandably, when the fourth distance H4mm is less than 5mm, the distance of the second solder mark 420 from the fourth side 222 in the third direction Z is too small, making it difficult to weld the second layer stack 220 to the electrical connector 300, resulting in high welding difficulty. When the fourth distance H4mm is greater than 20mm, the distance of the second solder mark 420 from the electrode 100 in the third direction Z is too small, easily damaging the electrode 100, and also making it difficult to weld the second layer stack 220 to the electrical connector 300, resulting in high welding difficulty. This embodiment of the application, by limiting 5mm ≤ H4mm ≤ 20mm, ensures that the second solder mark 420 is relatively centered along the third direction Z on the second layer stack 220, thereby facilitating the welding of the second layer stack 220 and the electrical connector 300.

[0063] In some implementations, see Figure 3As shown, the first solder mark 410 has a fifth distance D1mm between it and the second stack 220 in the first direction X; the exposed area 400 has a length dimension D2mm in the first direction X, wherein D1mm≤0.5D2mm.

[0064] It is understandable that the longer the length of the first solder mark 410 along the first direction X in the exposed area 400, the better the effect of the electrical connection piece 300 corresponding to the exposed area 400 in the second direction Y in improving the stability of the first solder mark 410, and the better the structural stability of the first solder mark 410 at the junction of the first laminate 210 and the exposed area 400. When the fifth distance D1mm is greater than 0.5D2mm, the length of the first solder mark 410 in the exposed area 400 along the first direction X is relatively short, which makes the effect of the electrical connection piece 300 corresponding to the exposed area 400 in improving the structural stability of the first solder mark 410 in the second direction Y ineffective, resulting in poor structural stability of the first solder mark 410 at the junction of the first laminate 210 and the exposed area 400. This embodiment of the application limits D1mm≤0.5D2mm, so that the length of the first solder mark 410 in the first direction X in the exposed area 400 is greater than 0.5D2mm. This ensures that the length of the first solder mark 410 in the first direction X in the exposed area 400 is relatively long, so that the electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y can better improve the stability of the first solder mark 410, thereby improving the structural stability of the first solder mark 410 at the junction of the first layer stack 210 and the exposed area 400.

[0065] Further, see Figure 4 As shown, the second solder mark 420 has a sixth distance D3mm between it and the first stack 210 in the first direction X, wherein D3mm≤0.5D2mm.

[0066] It is understandable that the longer the length of the second solder mark 420 along the first direction X in the exposed area 400, the better the effect of the electrical connection piece 300 corresponding to the exposed area 400 in the second direction Y in improving the stability of the second solder mark 420, and the better the structural stability of the second solder mark 420 at the junction of the second laminate 220 and the exposed area 400. When the sixth distance D3mm is greater than 0.5D2mm, the length of the second solder mark 420 in the exposed area 400 along the first direction X is relatively short, which makes the effect of the electrical connection piece 300 corresponding to the exposed area 400 in improving the structural stability of the second solder mark 420 in the second direction Y poor, resulting in poor structural stability of the second solder mark 420 at the junction of the second laminate 220 and the exposed area 400. This embodiment of the application limits D3mm≤0.5D2mm, so that the length of the second solder mark 420 in the first direction X in the exposed area 400 is greater than 0.5D2mm. This ensures that the length of the second solder mark 420 in the first direction X in the exposed area 400 is relatively long, so that the electrical connection piece 300 corresponding to the exposed area 400 along the second direction Y can better improve the stability of the second solder mark 420, thereby improving the structural stability of the second solder mark 420 at the junction of the second laminate 220 and the exposed area 400.

[0067] Further, 0.5mm ≤ D1mm ≤ 30mm; and / or, 0.5mm ≤ D2mm ≤ 65mm; and / or, 0.5mm ≤ D3mm ≤ 30mm. For example, D1mm can be selected from 0.5mm, 1mm, 3mm, 6mm, 9mm, 12mm, 15mm, 18mm, 21mm, 24mm, 27mm, or 30mm. D2mm can be selected from 0.5mm, 1mm, 3mm, 6mm, 9mm, 12mm, 15mm, 18mm, 21mm, 24mm, 27mm, 30mm, 40mm, 50mm, 60mm, or 65mm. D3mm can be selected from 0.5mm, 1mm, 3mm, 6mm, 9mm, 12mm, 15mm, 18mm, 21mm, 24mm, 27mm, or 30mm.

[0068] In some implementations, see Figure 5 As shown, a third solder mark 430 is provided on the electrical connector 300, and the third solder mark 430 is located in the exposed area 400. The third solder mark 430 is connected to the first solder mark 410 and the second solder mark 420 respectively.

[0069] Since the first solder mark 410 and the second solder mark 420 are connected as one unit through the third solder mark 430, the first solder mark 410 and the third solder mark 430 can help improve the structural stability of the second solder mark 420. The second solder mark 420 and the third solder mark 430 can help improve the structural stability of the first solder mark 410, thereby improving the welding effect between the first laminate 210 and the second laminate 220 and the electrical connector 300, and avoiding the occurrence of cold solder joints.

[0070] In some embodiments, when the tab 200 is soldered to the electrical connector 300, the first solder mark 410, the second solder mark 420, and the third solder mark 430 are integrally formed on the electrical connector 300. During this process, the first solder mark 410 solders the first laminate 210 and the electrical connector 300, and a portion of the first solder mark 410 extends to the electrical connector 300 corresponding to the exposed area 400. The second solder mark 420 solders the second laminate 220 and the electrical connector 300, and a portion of the second solder mark 420 extends to the electrical connector 300 corresponding to the exposed area 400. The third solder mark 430 is formed on the electrical connector 300 corresponding to the exposed area 400 and connects the first solder mark 410 and the second solder mark 420 respectively.

[0071] In some embodiments, the first solder mark 410, the second solder mark 420, and the third solder mark 430 have a total length dimension D4mm in the first direction X; wherein, 5mm≤D4mm≤65mm, and 0.1≤D2 / D4≤4. Exemplarily, D4mm can be selected from 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, or 65mm.

[0072] It is understandable that when D2 / D4 is greater than 4, the length dimension D2mm of the exposed area 400 in the first direction X is large, and the total length dimension D4mm of the first solder mark 410, the second solder mark 420, and the third solder mark 430 in the first direction X is small, which can easily lead to unreliable welding. By limiting 0.1≤D2 / D4≤4, the embodiments of this application can better improve the welding stability of the first laminate 210 and the electrical connector 300, and can better improve the welding stability of the second laminate 220 and the electrical connector 300.

[0073] In some implementations, see Figure 7 and Figure 8 As shown, the first solder mark 410 has a length dimension A mm in the first direction X; the first stack 210 has a thickness dimension B mm in the second direction Y, wherein 10 mm ≤ A mm ≤ 30 mm, 0.2 mm ≤ B mm ≤ 1 mm, and 10 ≤ A / B ≤ 150.

[0074] For example, Amm can be selected as 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm or 30mm. Bmm can be selected as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0075] Understandably, when A / B is less than 10, the length of the first solder mark 410 in the first direction X is too short, and the thickness of the first solder mark 410 in the second direction Y is too thick. This results in poor connection between the first solder mark 410 and the first laminate 210 and the electrical connector 300, making it easy for the first laminate 210 and the electrical connector 300 to detach, leading to a false solder joint and affecting the efficiency and safety of the battery cell. When A / B is greater than 150, the length of the first solder mark 410 in the first direction X is too long, and the thickness of the first solder mark 410 in the second direction Y is too thin. The first solder mark 410 will occupy the formation space of the second solder mark 420, and the first solder mark 410 is prone to breakage. By limiting 10≤A / B≤150, this application embodiment can ensure the stability of the connection between the first solder mark 410 and the first laminate 210 and the electrical connector 300, and prevent the first laminate 210 and the electrical connector 300 from separating. On the other hand, it can prevent the first solder mark 410 from being too long in the first direction X, which would affect the formation of the second solder mark 420, and can also prevent the first solder mark 410 from breaking.

[0076] In some implementations, see Figure 7 and Figure 8 As shown, the second solder mark 420 has a length dimension C mm in the first direction X; the second stack 220 has a thickness dimension E mm in the second direction Y, wherein 10 mm ≤ C mm ≤ 30 mm, 0.2 mm ≤ E mm ≤ 1 mm, and 10 ≤ C / E ≤ 150.

[0077] For example, Cmm can be selected as 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm or 30mm. Emm can be selected as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0078] Understandably, when C / E is less than 10, the length of the second solder mark 420 in the first direction X is too short, and the thickness of the second solder mark 420 in the second direction Y is too thick. This results in poor connection between the second solder mark 420 and the second stack 220 and the electrical connector 300, making it easy for the second stack 220 and the electrical connector 300 to detach, leading to incomplete soldering and affecting the efficiency and safety of the battery cell. When C / E is greater than 150, the length of the second solder mark 420 in the first direction X is too long, and the thickness of the second solder mark 420 in the second direction Y is too thin. The second solder mark 420 will occupy the formation space of the first solder mark 410, and the second solder mark 420 is prone to breakage. By limiting 10≤C / E≤150, this embodiment of the application can ensure the stability of the connection between the second solder mark 420 and the second laminate 220 and the electrical connector 300, and prevent the second laminate 220 and the electrical connector 300 from separating. On the other hand, it can prevent the second solder mark 420 from being too long in the first direction X, which would affect the formation of the first solder mark 410, and can also prevent the second solder mark 420 from breaking.

[0079] In some implementations, see Figure 9 As shown, the tab portion 200 includes at least one connecting piece 230, and the connecting piece 230 is located within the exposed area 400. The connecting piece 230 is connected to the first stack portion 210 and the second stack portion 220 respectively in the first direction X. When there are multiple connecting pieces 230, the multiple connecting pieces 230 are arranged sequentially along the second direction Y. Each connecting piece 230 can be connected to one tab, or multiple tabs can be connected simultaneously, without particular limitation.

[0080] It should be noted that the connecting piece 230 can be integrally formed with the first stacked portion 210 and the second stacked portion 220 by cutting the tab portion 200. Alternatively, the connecting piece 230 can be formed by cutting the tab portion 200 to create the first stacked portion 210 and the second stacked portion 220, and then welded onto the first stacked portion 210 and the second stacked portion 220. No particular limitation is made in this regard. In this embodiment, the connecting piece 230 is integrally formed with the first stacked portion 210 and the second stacked portion 220 by cutting the tab portion 200.

[0081] It is understandable that since the first stack 210 and the second stack 220 are connected by the connecting piece 230, the connecting piece 230 can realize electrical conduction between the first stack 210 and the second stack 220, thereby ensuring the overall conductivity of the tab 200. Furthermore, the first stack 210 and the second stack 220 can be formed into an integral structure through the connection of the connecting piece 230, which can better ensure the structural stability of the tab 200 and also facilitate the simultaneous adjustment of the positions of the first stack 210 and the second stack 220.

[0082] In some implementations, see Figure 9 As shown, the connecting piece 230 has a length dimension M1mm in the first direction X, wherein 0.1mm≤M1mm≤60mm. For example, M1mm can be selected from 0.1mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm or 60mm.

[0083] Understandably, when M1mm is less than 0.1mm, the spacing between the first stack 210 and the second stack 220 in the first direction X is too small. This makes it difficult for the first solder mark 410 formed on the first stack 210 to extend to the electrical connection piece 300 corresponding to the exposed area 400 in the second direction Y. Similarly, the second solder mark 420 formed on the second stack 220 also makes it difficult to extend to the electrical connection piece 300 corresponding to the exposed area 400 in the second direction Y. This will affect the electrical connection between the first stack 210 and the second stack 220 and the electrical connection piece 300, respectively. The stability of the welding of sheet 300 is affected by the risk of poor welding. When M1mm is greater than 60mm, the spacing between the first stack 210 and the second stack 220 in the first direction X is too large, resulting in an excessively large exposed area 400 in the first direction X. This leads to the first stack 210 and the second stack 220 being too small in the first direction X. On the one hand, this will affect the structural stability of the welding of the first stack 210 and the second stack 220 to the electrical connection sheet 300, and on the other hand, it will reduce the conductivity of the entire tab 200, affecting the utilization efficiency of the battery cell. This embodiment of the application limits the spacing between the first stack 210 and the second stack 220 in the first direction X to 0.1mm≤M1mm≤60mm, which makes the spacing between the first stack 210 and the second stack 220 in the first direction X appropriate. This facilitates the extension of the first solder mark 410 and the second solder mark 420 into the exposed area 400, which can reduce the processing difficulty and avoid the occurrence of cold solder joints. It can also ensure the structural stability of the welding of the first stack 210 and the second stack 220 to the electrical connecting piece 300, and ensure that the entire tab 200 has good conductivity.

[0084] In some implementations, see Figure 9 As shown, the connecting piece 230 has a width dimension M2mm in the third direction Z, where 1mm≤M2mm≤25mm. For example, M2mm can be selected as 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, 21mm, 23mm or 25mm.

[0085] Understandably, when M2mm is less than 1mm, the connection strength between the connecting piece 230 and the first stack 210 and the second stack 220 is low, making it easy for the connecting piece 230 to break off from the first stack 210 and the second stack 220. When M2mm is greater than 25mm, the connecting piece 230 will occupy too much of the exposed area 400, making it difficult for the first solder mark 410 to extend to the electrical connecting piece 300 corresponding to the exposed area 400 along the second direction Y, and making it difficult for the second solder mark 420 to extend to the electrical connecting piece 300 corresponding to the exposed area 400 along the second direction Y. This embodiment of the application limits the width of the connecting piece 230 in the third direction Z to be moderate, which can ensure the connection strength between the connecting piece 230 and the first layer stack 210 and the second layer stack 220 respectively. This makes it less likely for the connecting piece 230 to break off from the first layer stack 210 or the second layer stack 220, and reduces the occupation of the exposed area 400 by the connecting piece 230. This makes it easier for the first solder mark 410 and the second solder mark 420 to extend into the exposed area 400, reducing the processing difficulty.

[0086] For example, in the embodiments of this application, see Figure 9 As shown, the connecting piece 230 is connected to the electrode 100 in the third direction Z. Since an active material layer is coated on the surface of the electrode 100, and the exposed area 400 is formed by cutting the tab 200, when M2mm is less than 1mm, the electrode 100 is easily cut during the cutting of the tab 200, resulting in damage to the active material layer on the electrode 100. This embodiment of the application limits the width of the connecting piece 230 to 1mm ≤ M2mm ≤ 25mm, ensuring a suitable width in the third direction Z, thus avoiding damage to the electrode 100 and its active material layer during the cutting of the tab 200.

[0087] In some implementations, see Figures 1-12 As shown, a first insulating layer 500 is provided at the junction of the first stacked portion 210, the second stacked portion 220 and the connecting piece 230 with the electrode piece 100, that is, the first insulating layer 500 is provided at the junction of the tab portion 200 and the electrode piece 100.

[0088] The battery cell of this application embodiment includes a plurality of electrode sheets 100, which are stacked and arranged in layers. A separator is provided between two adjacent electrode sheets 100 to separate them and prevent short circuits caused by contact between adjacent electrode sheets 100. Each adjacent electrode sheet 100 is provided with a tab 200. By providing a first insulating layer 500 at the junction between the tab 200 and the electrode sheet 100, short circuits caused by contact between the tab 200 and the adjacent electrode sheet 100 can be prevented, thereby improving the safety of the battery cell.

[0089] In some embodiments, the first insulating layer 500 may be applied to the junction of the first laminate 210, the second laminate 220, the connecting piece 230, and the electrode 100, depending on the type, or it may be pasted on the junction of the first laminate 210, the second laminate 220, the connecting piece 230, and the electrode 100. There is no particular limitation on this.

[0090] For example, the first insulating layer 500 may be a coating applied to the junction of the first laminate 210, the second laminate 220 and the connecting piece 230 with the electrode 100, or the first insulating layer 500 may be insulating tape pasted on the junction of the first laminate 210, the second laminate 220 and the connecting piece 230 with the electrode 100.

[0091] In some implementations, see Figures 10-12 As shown, a second insulating layer 600 is provided on the first stack 210, the second stack 220 and the connecting piece 230. The second insulating layer 600 is an adhesive insulating tape. By providing the second insulating layer 600 on the first stack 210, the second stack 220 and the connecting piece 230, it is possible to prevent the tab 200 from contacting the adjacent electrode 100 and causing a short circuit.

[0092] Further, see Figures 10-12 As shown, the connecting piece 230 of this application embodiment has a fifth side 231 away from the electrode 100 in the third direction Z. After the electrode tab 200 is welded to the electrical connecting piece 300, a second insulating layer 600 is provided on the first stack 210, the second stack 220 and the connecting piece 230, and the second insulating layer 600 covers the fifth side 231 in the second direction Y.

[0093] It is worth mentioning that the connection points between the connecting piece 230 and the first laminate 210 and the second laminate 220 are relatively fragile areas. By covering the fifth side 231 with the second insulating layer 600, the area where the connecting piece 230 is connected to the first laminate 210 or the second laminate 220 can be prevented from breaking, thereby improving the structural stability of the connection between the connecting piece 230 and the first laminate 210 and the second laminate 220.

[0094] In some implementations, see Figure 11 and Figure 12As shown, when the first laminate 210 is connected to the electrical connector 300 by the first solder mark 410, and the second laminate 220 is connected to the electrical connector 300 by the second solder mark 420, the second insulating layer 600 covers the first solder mark 410 and the second solder mark 420 in the second direction Y, so that the second insulating layer 600 can prevent dust or moisture from adhering to the first solder mark 410 and the second solder mark 420, and can play a good protective role for the first solder mark 410 and the second solder mark 420.

[0095] See Figure 11 and Figure 12 As shown, since the third solder mark 430 of this application embodiment is connected to the first solder mark 410 and the second solder mark 420 in the first direction X, the second insulating layer 600 can cover the third solder mark 430 while covering the first solder mark 410 and the second solder mark 420. This allows the second insulating layer 600 to prevent dust or moisture from adhering to the third solder mark 430, thus providing good protection for the third solder mark 430.

[0096] In some implementations, see Figure 12 As shown, when the first laminate 210 is connected to the electrical connector 300 by the first solder mark 410, and the second laminate 220 is connected to the electrical connector 300 by the second solder mark 420, the second insulating layer 600 covers the exposed area 400 in the second direction Y, thereby improving the structural stability of the entire tab 200 and preventing the tab 200 from breaking at the exposed area 400.

[0097] In some implementations, see Figures 10-12 As shown, the second insulating layer 600 extends into the electrode 100 in the third direction Z, thereby enabling the second insulating layer 600 to provide better protection for the electrode 100. Furthermore, the isolation provided by the second insulating layer 600 can prevent short circuits between adjacent electrodes 100.

[0098] Secondly, this application provides a battery comprising the aforementioned battery cell, thus possessing the corresponding technical effects and advantages described above.

[0099] The battery in this embodiment of the application also includes a housing, the interior of which forms a receiving cavity; the battery cells are housed in the receiving cavity.

[0100] Furthermore, the number of battery cells can be set to multiple, with multiple battery cells simultaneously housed in the receiving cavity, and the multiple battery cells interconnected by series or parallel connection.

[0101] Thirdly, the embodiments of this application provide an electrical device that includes the aforementioned battery cell or battery, and thus possesses the corresponding technical effects and advantages described above.

[0102] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A single battery cell, characterized in that: include, A housing, wherein the ends of the housing are provided with pole post assemblies; The battery cell is housed within the housing; the battery cell includes an electrode (100), and one side of the electrode (100) is provided with a tab (200) extending from the side of the electrode (100). The tab portion (200) includes a first stack portion (210) and a second stack portion (220), the first stack portion (210) and the second stack portion (220) are spaced apart in a first direction, the first direction being the length direction of the electrode sheet (100); when the tab portion (200) is welded to the electrode post assembly, the gap between the first stack portion (210) and the second stack portion (220) forms a bare area (400) for the electrode post assembly in a second direction, the second direction being perpendicular to the first direction and being the thickness direction of the tab portion (200); The tab (200) and the pole assembly have a first solder mark (410) and a second solder mark (420); a portion of the first solder mark (410) is formed at the first stack (210) to weld the first stack (210) to the pole assembly, and another portion is formed at the pole assembly corresponding to the exposed area (400) along the second direction; a portion of the second solder mark (420) is formed at the second stack (220) to weld the second stack (220) to the pole assembly, and another portion is formed at the pole assembly corresponding to the exposed area (400) along the second direction.

2. The battery cell according to claim 1, characterized in that: The first stack (210) has a first side (211) in the first direction that is away from the second stack (220); the distance between the first solder mark (410) and the first side (211) is H1mm, wherein 5mm≤H1mm≤15mm; And / or, the first stack (210) has a second side (212) in a third direction that is away from the electrode (100), the third direction being perpendicular to the first direction and the second direction; the distance between the first solder mark (410) and the second side (212) is H2mm, wherein 5mm≤H2mm≤20mm.

3. The battery cell according to claim 1, characterized in that: The second stack (220) has a third side (221) in the first direction that is away from the first stack (210); the distance between the second solder mark (420) and the third side (221) is H3mm, wherein 5mm≤H3mm≤15mm; And / or, the second stack (220) has a fourth side (222) in a third direction away from the electrode (100), the third direction being perpendicular to the first direction and the second direction; the distance between the second solder mark (420) and the fourth side (222) is H4mm, wherein 5mm≤H4mm≤20mm.

4. The battery cell according to claim 1, characterized in that: The distance between the first solder mark (410) and the second laminate (220) along the first direction is D1mm; the length of the exposed area (400) in the first direction is D2mm; wherein, D1mm≤0.5D2mm; And / or, the distance between the second solder mark (420) and the first stack (210) along the first direction is D3mm; wherein, D3mm≤0.5D2mm.

5. The battery cell according to claim 4, characterized in that: 0.5mm≤D1mm≤30mm; and / or, 0.5mm≤D2mm≤65mm; and / or, 0.5mm≤D3mm≤30mm.

6. The battery cell according to claim 4, characterized in that: The pole assembly is provided with a third solder mark (430), which is located in the exposed area (400) and is connected to the first solder mark (410) and the second solder mark (420) respectively.

7. The battery cell according to claim 6, characterized in that: The first solder mark (410), the second solder mark (420) and the third solder mark (430) are integrally formed on the pole assembly.

8. The battery cell according to claim 6, characterized in that: The first solder mark (410), the second solder mark (420) and the third solder mark (430) have a total length dimension D4 mm in the first direction; wherein, 0.1 ≤ D2 / D4 ≤ 4.

9. The battery cell according to claim 8, characterized in that: 5mm≤D4mm≤65mm.

10. The battery cell according to claim 1, characterized in that: The first solder mark (410) has a length dimension A mm in the first direction; the first stack (210) has a thickness dimension B mm in the second direction, wherein 10 ≤ A / B ≤ 150.

11. The battery cell according to claim 10, characterized in that: 10mm≤Amm≤30mm; and / or, 0.2mm≤Bmm≤1mm.

12. The battery cell according to claim 1, characterized in that: The second solder mark (420) has a length dimension C mm in the first direction; the second stack (220) has a thickness dimension E mm in the second direction, wherein 10 ≤ C / E ≤ 150.

13. The battery cell according to claim 12, characterized in that: 10mm≤Cmm≤30mm; and / or, 0.2mm≤Emm≤1mm.

14. The battery cell according to claim 1, characterized in that: The tab (200) includes at least one connecting piece (230) located within the exposed area (400), and the connecting piece (230) is connected to the first stacked portion (210) and the second stacked portion (220) respectively.

15. The battery cell according to claim 14, characterized in that: The connecting piece (230) has a length dimension M1mm in the first direction, wherein 0.1mm≤M1mm≤60mm; And / or, the connecting piece (230) has a width dimension M2mm in a third direction, the third direction being perpendicular to the first direction and the second direction, wherein 1mm≤M2≤25mm.

16. The battery cell according to claim 14, characterized in that: The first stacked portion (210), the second stacked portion (220) and the connecting piece (230) are integrally formed on the electrode (100).

17. The battery cell according to any one of claims 14-16, characterized in that: A first insulating layer (500) is provided at the junction of the first stacked portion (210), the second stacked portion (220), the connecting piece (230), and the electrode (100).

18. The battery cell according to claim 17, characterized in that: The first insulating layer (500) is coated or adhered to the junction of the first laminate (210), the second laminate (220), and the connecting piece (230) with the electrode (100).

19. The battery cell according to claim 14, characterized in that: A second insulating layer (600) is provided on the first stacked portion (210), the second stacked portion (220) and the connecting piece (230). The connecting piece (230) has a fifth side (231) in a third direction that is away from the electrode (100), the third direction being perpendicular to the first direction and the second direction; the second insulating layer (600) covers the fifth side (231).

20. The battery cell according to claim 19, characterized in that: The second insulating layer (600) covers the first solder mark (410) and the second solder mark (420).

21. The battery cell according to claim 19, characterized in that: The second insulating layer (600) covers the exposed area (400).

22. The battery cell according to claim 19, characterized in that: The second insulating layer (600) extends upward onto the electrode (100) on the third party.

23. A battery, characterized in that: include, The box-shaped enclosure has a receiving cavity; The battery cell as described in any one of claims 1-22, wherein the battery cell is housed within the receiving cavity.

24. An electrical appliance, characterized in that: It includes the battery cell as described in any one of claims 1-22, or the battery as described in claim 23.

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