Battery and battery pack

Abstract

The utility model relates to battery technical field discloses battery and battery package, a kind of battery, comprising: battery core, including battery core body and the tab body that the end of battery core body extends out, tab body has first welding area and second welding area, first welding area and second welding area interval setting, tab body includes multiple tab sheet, and second welding area is used to weld multiple tab sheet;Pole assembly is welded with first welding area.In tab body on setting first welding area, first welding area is used to weld with pole assembly, second welding area is used to weld multiple tab sheet together, the structural strength of tab body is strengthened, the tensile force that can improve tab body receives from battery core body, reduce tab body tear in the edge of first welding area, guarantee the overcurrent capacity between tab body and pole assembly, in the process of charge-discharge, not because of excessive resistance local overheating, to avoid potential safety risk such as thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and battery packs. Background Technology

[0002] A secondary battery, also known as a rechargeable battery or accumulator, is a type of battery that can regain its electrical energy by being recharged after being discharged. Unlike primary batteries (which are not rechargeable), secondary batteries can undergo multiple charge-discharge cycles, making them widely used in modern electronic devices, electric vehicles, energy storage systems, and other fields.

[0003] Rechargeable batteries include lithium-ion batteries, nickel-metal hydride batteries, and lead-acid batteries. While different types of rechargeable batteries differ in their specific construction, most share similar basic components. A rechargeable battery typically consists of a casing, a cell, and terminals. The casing provides physical protection for the cell, preventing external environmental influences on its internal components. The cell is the core of the battery, responsible for the actual energy storage and release. The terminals serve as the battery's current output terminals, used to connect to external busbars, etc. The tabs of the cell are welded to the terminals. Prolonged or severe vibration can affect the current-carrying capacity between the tabs and terminals, leading to increased internal resistance and localized heating. If this localized overheating is not dissipated in time, it may trigger a chain reaction, ultimately resulting in thermal runaway, an extremely dangerous situation that could cause the battery to catch fire or explode. Utility Model Content

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that battery vibration affects the current carrying capacity between the tabs and terminals.

[0005] In a first aspect, the present invention provides a battery, comprising: a battery cell, including a battery cell body and a tab body extending from the end of the battery cell body, the tab body having a first welding area and a second welding area, the first welding area and the second welding area being spaced apart, the tab body including a plurality of tab pieces, the second welding area being used to weld the plurality of tab pieces; and a terminal assembly welded to the first welding area.

[0006] Secondly, this utility model also provides a battery pack, including the aforementioned battery.

[0007] Beneficial effects: A first welding area is set on the tab body for welding with the terminal assembly, and a second welding area is used to weld multiple tab pieces together, which strengthens the structural strength of the tab body, improves the tensile force on the tab body from the cell body, reduces tearing of the tab body at the edge of the first welding area, ensures the overcurrent capacity between the tab body and the terminal assembly, and prevents local overheating due to excessive resistance during charging and discharging, thereby avoiding potential safety risks such as thermal runaway. Attached Figure Description

[0008] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a perspective view of the first type of battery according to an embodiment of the present utility model;

[0010] Figure 2 for Figure 1 A three-dimensional view of the battery cell and terminal assembly from another perspective;

[0011] Figure 3 for Figure 2 A partial structural schematic diagram of the battery cell and terminal assembly is shown;

[0012] Figure 4 for Figure 3 The diagram shows the structure of the battery cell.

[0013] Figure 5 This is a partial structural diagram of the cell of the second type of battery according to an embodiment of the present utility model;

[0014] Figure 6 This is a partial structural diagram of the cell of the third type of battery according to an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1. Battery cell; 101. Battery cell body; 102. Electrode body; 1021. First welding area; 1022. Second welding area; 1023. Third welding area;

[0017] 2. Terminal assembly; 201. Terminal; 202. Adapter plate;

[0018] 4. Shell. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0021] According to an embodiment of the present invention, a battery is provided, comprising: a battery cell 1 and an electrode assembly 2. The battery cell 1 includes a battery cell body 101 and a tab body 102 extending from the end of the battery cell body 101. The tab body 102 has a first welding area 1021 and a second welding area 1022, which are spaced apart. The tab body 102 includes a plurality of tabs, and the second welding area 1022 is used to weld the plurality of tabs. The electrode assembly 2 is welded to the first welding area 1021.

[0022] The battery using this embodiment has a first welding area 1021 on the tab body 102. The first welding area 1021 is used to weld with the terminal assembly 2, and the second welding area 1022 is used to weld multiple tab pieces together, which strengthens the structural strength of the tab body 102. This can improve the tensile force on the tab body 102 from the cell body 101, reduce the tearing of the tab body 102 at the edge of the first welding area 1021, ensure the overcurrent capacity between the tab body 102 and the terminal assembly 2, and prevent local overheating due to excessive resistance during charging and discharging, thereby avoiding potential safety risks such as thermal runaway.

[0023] In one embodiment, such as Figure 4 As shown, the tab also has a third welding area 1023, and a first welding area 1021 is located inside the third welding area 1023. The third welding area 1023 is used to weld multiple tab pieces. Before welding the terminal assembly 2 and the tab body 102, multiple tab pieces are pre-welded together in the third welding area 1023. Then, the tab body 102 and the terminal assembly 2 are welded in the first welding area 1021 within the third welding area 1023. In this way, multiple tab pieces are welded into a single structure. During the subsequent welding process with the terminal assembly 2, relative movement or misalignment between the tab pieces can be effectively prevented, ensuring accurate welding positions. Furthermore, welding multiple tab pieces into a single unit increases the overall mechanical strength of this area, reduces the risk of damage due to vibration or impact, and enhances the durability of the battery pack.

[0024] In one embodiment, such as Figure 4 As shown, the second welding area 1022 is located outside the third welding area 1023. Multiple tabs are welded together in both the first welding area 1021 and the third welding area 1023, further enhancing the structural strength of the tab body 102 and improving the tensile force exerted on the tab body 102 by the cell body 101. This effectively prevents tearing of the tab body 102 at the edge of the first welding point, ensuring current transmission between the tab body 102 and the electrode assembly 2, and reducing energy loss.

[0025] Understandably, in another embodiment, the second welding area 1022 is located inside the third welding area 1023.

[0026] In one embodiment, the second welding area 1022 is welded to the terminal assembly 2. Welding the second welding area 1022 to the terminal assembly 2 further enhances the connection strength of the second welding area 1022 and provides a good buffering effect on the first welding area 1021, thereby avoiding serious safety issues such as thermal runaway caused by internal short circuits due to ear tearing, and ensuring the safety of the battery during use.

[0027] Furthermore, the pole assembly 2 includes a pole 201 and an adapter piece 202, the tab body 102 is welded to the adapter piece 202, and the adapter piece 202 is welded to the pole 201.

[0028] In one embodiment, such as Figure 4 As shown, the distance L1 between the second welding area 1022 and the first welding area 1021 is 0.3mm-6mm. L1 cannot be too large or too small. If L1 is too large, the tab body 102 located between the second welding area 1022 and the first welding area 1021 will be subjected to the tension of the second welding area 1022, which will aggravate the tearing of the tab body 102 at the edge of the first welding area 1021. If L1 is too small, the buffering effect of the tension from the cell body 101 will be poor, and the tab body 102 will easily tear at the edge of the first welding area 1021.

[0029] Therefore, when L1 is within the above-mentioned range, that is, when L1 is within a suitable range, it ensures the buffering effect of the pulling force from the cell body 101, effectively avoiding serious safety problems such as thermal runaway caused by ear tearing that may lead to internal short circuit, and ensuring the safety of the battery during use.

[0030] Preferably, L1 is 0.5mm-5mm.

[0031] For example, L1 is 0.3mm, 0.4mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.7mm, 4.9mm, 5mm, 5.2mm, 5.4mm, 5.5mm, 5.8mm, 6mm, or within any two of the above values.

[0032] In one embodiment, such as Figure 4 As shown, the second welding area 1022 has a first side edge close to the first welding area 1021 and a second side edge opposite to the first side edge. The distance L2 between the first side edge and the second side edge is 0.2mm-2.5mm. L2 cannot be too large or too small. If L2 is too small, the width of the second welding area 1022 will be too narrow, resulting in poor buffering effect from the tensile force from the cell body 101, and the tab body 102 will be prone to tearing at the edge of the first welding area 1021. If L2 is too large, the size of the electrode assembly 2 will be too large, requiring more material and resulting in higher cost. At the same time, the size of the battery will also be larger, leading to low space utilization.

[0033] Therefore, when L2 is within the aforementioned range, that is, when L2 is within a suitable range, it not only ensures the buffering effect from the pulling force of the cell body 101, effectively avoiding serious safety issues such as thermal runaway caused by ear tearing that may lead to internal short circuits, but also ensures the safety of the battery during use; it also controls the size of the terminal assembly 2 and the battery, reduces costs, and improves space utilization.

[0034] Preferably, L2 is 0.3mm-2.4mm.

[0035] For example, L2 is 0.2mm, 0.3mm, 0.4mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, or within any two of the above values.

[0036] In one embodiment, such as Figure 4As shown, along the first direction, the distance L3 between the second welding area 1022 and the base of the tab body 102 near the cell body 101, and the distance L4 between the first welding area 1021 and the base of the tab body 102, are as follows: L3 / L4 is 0.088-1.8. L3 / L4 cannot be too large or too small. If L3 / L4 is too small, the tab body 102 located between the second welding area 1022 and the first welding area 1021 will be subjected to the tension of the second welding area 1022, which will exacerbate the tearing of the tab body 102 at the edge of the first welding area 1021. If L3 / L4 is too large, the buffering effect of the tension from the cell body 101 will be poor, and the tab body 102 will easily tear at the edge of the first welding area 1021.

[0037] Therefore, when L3 / L4 is within the aforementioned range, that is, when L3 / L4 is within a suitable range, the buffering effect from the pulling force of the cell body 101 is guaranteed, effectively avoiding serious safety problems such as thermal runaway caused by ear tearing that may lead to internal short circuit, and ensuring the safety of the battery during use.

[0038] Preferably, L3 / L4 is 0.088, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 or within the range of any two of the above values.

[0039] Furthermore, L3 is 1.5mm-9mm, and L4 is 5mm-17mm. Preferably, L3 is 2mm-8mm, and L4 is 6mm-15mm.

[0040] For example, L3 is 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.4mm, 3mm, 3.4mm, 3.8mm, 4mm, 4.4mm, 4.7mm, 4.9mm, 5mm, 5.2mm, 5.4mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.5mm, 8.8mm, 9mm, or within any two of the above values, and L4 is 5mm. 5.2mm, 5.4mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.5mm, 8.8mm, 9mm, 10mm, 10.6mm, 11mm, 11.6mm, 12mm, 12.6mm, 13mm, 13.6mm, 14mm, 14.6mm, 15mm, 15.6mm, 16mm, 16.6mm, 16.8mm, 17mm, or within the range of any two of the above values.

[0041] In one embodiment, such as Figure 6 As shown, the second welding area 1022 is continuously arranged around the first welding area 1021. The second welding area 1022 has a larger area and the structure strength of the tab body 102 is higher. This can further reduce the tearing of the tab body 102 at the edge of the first welding area 1021 and ensure the current flow capacity between the tab body 102 and the pole assembly 2.

[0042] It is understood that in another embodiment, such as Figure 5As shown, multiple second welding areas 1022 are provided, and these multiple second welding areas 1022 are arranged at intervals around the first welding area 1021. The interval L5 between two adjacent second welding areas 1022 is 0.1mm-1.5mm. L5 cannot be too large or too small. If L5 is small, the small spacing limits the deformation capability of the tab body 102. When facing external loads, the material near adjacent welding areas is difficult to adapt to this change independently, and deformation inconsistency is likely to occur. This inconsistency in deformation will form high stress points at the edge of the second welding area 1022. Over time, these high stress points may cause micro-cracks, which may eventually lead to tab tearing. If L5 is too large, the area of ​​the second welding area 1022 is small, and the buffering effect on the tab body 102 under the tension of the cell body 101 is poor. The tab body 102 is prone to tearing at the edge of the first welding area 1021. Therefore, L5 is within the above-mentioned range, that is, L5 is controlled within a suitable range, to ensure the buffering effect of the tension of the tab body 102 on the cell body 101, while avoiding stress concentration at the edge of the second welding area 1022, thereby ensuring the stability of the battery.

[0043] Preferably, L5 is 0.2mm-1mm. For example, L5 is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or within any two of the above values.

[0044] It should be noted that, Figures 4 to 6 In the diagram, the light gray area refers to the second welding area, the black area refers to the first welding area, and the dark gray and black areas refer to the third welding area.

[0045] In one embodiment, the weld mark shape of the second welding area 1022 is either strip-shaped or dot-shaped. Strip-shaped weld marks have a larger welding area, enhancing the structural strength of the tab body 102. Dot-shaped weld marks cause less deformation of the tab body 102, allowing for flexible adjustment of the energy input of individual weld points according to specific needs, thus optimizing welding quality.

[0046] In one embodiment, the battery further includes a casing 4, which is disposed on the outermost side of the battery cell 1 to protect the battery cell 1. The material of the casing 4 can be, but is not limited to, aluminum, steel, aluminum alloy, etc. Specifically, the material of the casing 4 can be aluminum-manganese alloy, aluminum-magnesium alloy, stainless steel, nickel-plated steel, carbon steel, titanium, etc.

[0047] Furthermore, the terminal 201 serves as the current output terminal of the battery, used to connect to external busbars, etc., to realize series and parallel connection between batteries; the terminal 201 may include a positive terminal and a negative terminal; the material of the terminal may be aluminum, copper, copper-aluminum composite, etc.

[0048] Specifically, the battery cell is the smallest charging and discharging unit. The battery cell 1 includes a positive electrode plate, a negative electrode plate, and a separator. The separator is disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate, the negative electrode plate, and the separator are stacked or wound to form the battery cell 1.

[0049] Furthermore, the positive electrode sheet includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive current collector is not particularly limited, as long as it is conductive and will not cause adverse chemical changes in the battery. The positive current collector can be made of metal materials such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material layer includes the positive active main material, conductive agent, binder, etc. The positive active main material includes one or more lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0050] Furthermore, the negative electrode includes a negative current collector and a layer of negative active material disposed on at least one surface of the negative current collector. The negative current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite foil formed by combining metals and insulating materials. The negative active material layer includes a negative active main material, a conductive agent, and a binder, etc. The negative active main material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc. The tab serves as the current output terminal of the battery cell, and the tab is integrally connected to the positive or negative electrode or is connected separately.

[0051] Furthermore, the separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrodes. As a semi-permeable layer, it prevents larger molecules from passing through while allowing smaller charged ions to pass. There are no particular restrictions on the type of separator; any known porous structure separator with good chemical and mechanical stability can be used. For example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0052] In one embodiment, the battery can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., but this application embodiment does not limit this.

[0053] It is understood that in other embodiments, the battery cell can be a metal battery. Specifically, the metal battery may include lithium metal secondary batteries, sodium metal batteries, or magnesium metal batteries, etc. This application embodiment does not limit this.

[0054] In some embodiments, the battery is suitable for various electrical devices, such as vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical devices.

[0055] According to an embodiment of the present invention, another aspect provides a battery pack, including the battery described above.

[0056] Furthermore, the battery pack also includes a housing, and multiple batteries are connected in series, parallel or mixed via busbars to form battery modules, which are housed within the housing.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: A battery cell (1) includes a battery cell body (101) and a tab body (102) extending from the end of the battery cell body (101). The tab body (102) has a first welding area (1021) and a second welding area (1022), which are spaced apart. The tab body (102) includes a plurality of tabs, and the second welding area (1022) is used to weld the plurality of tabs. The pole assembly (2) is welded to the first welding area (1021).

2. The battery according to claim 1, characterized in that, The tab also has a third welding area (1023), the first welding area (1021) is located inside the third welding area (1023), and the third welding area (1023) is used to weld a plurality of the tab pieces.

3. The battery according to claim 2, characterized in that, The second welding area (1022) is located inside or outside the third welding area (1023).

4. The battery according to any one of claims 1 to 3, characterized in that, The second welding area (1022) is welded to the pole assembly (2).

5. The battery according to any one of claims 1 to 3, characterized in that, The distance L1 between the second welding area (1022) and the first welding area (1021) is 0.3mm-6mm.

6. The battery according to any one of claims 1 to 3, characterized in that, The second welding area (1022) has a first side near the first welding area (1021) and a second side opposite to the first side, and the distance L2 between the first side and the second side is 0.2mm-2.5mm.

7. The battery according to any one of claims 1 to 3, characterized in that, Along the first direction, the distance L3 between the second welding area (1022) and the electrode body (102) near the root of the cell body (101) is L4, and the distance between the first welding area (1021) and the root of the electrode body (102) is L4, with L3 / L4 being 0.088-1.

8.

8. The battery according to any one of claims 1 to 3, characterized in that, The second welding area (1022) is continuously arranged around the first welding area (1021), or there are multiple second welding areas (1022), and multiple second welding areas (1022) are arranged at intervals around the first welding area (1021).

9. The battery according to any one of claims 1 to 3, characterized in that, The weld mark shape of the second welding area (1022) is strip-shaped or dot-shaped.

10. A battery pack, characterized in that, include: The battery according to any one of claims 1 to 9.

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