battery

Abstract

The utility model relates to battery technical field discloses a kind of batteries, comprising: battery cell, including battery cell body and the tab body that extends from the end of battery cell body, tab body has the root portion close to battery cell body;Pole assembly, with tab body welding forms first welding area, first welding area has the first edge close to battery cell body;Support, including first support part, first support part is set between root portion and first edge, and first support part is in abutment with tab body Settings.Battery in the process of using when vibration, battery cell is with tab body vibration, tab body is in abutment on first support part, reduce the vibration degree of tab body by first support part, reduce the influence that tab body is subjected to vibration, avoid the edge of tab body at first welding area place to tear, guarantee the overcurrent capacity between tab body and pole assembly, in the process of charge and discharge, it will not cause local overheating because of excessive resistance, 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. Background Technology

[0002] With advancements in battery technology, rechargeable batteries are evolving towards higher energy density, faster charging, longer lifespan, and lower cost. A rechargeable battery is a type of battery that can recover its performance after being discharged through a charging process. Rechargeable batteries are widely used in consumer electronics (such as mobile phones, tablets, and digital cameras), electric vehicles, and energy storage systems.

[0003] Currently, batteries consist of a casing, a cell, and a terminal assembly. The cell is housed inside the casing and includes a cell body and a tab body extending from the end of the cell body. The tab body and the terminal assembly are welded together to form a welded area. When the battery vibrates during use, the current-carrying capacity between the tab body and the terminal assembly is poor, which increases the internal resistance of the battery, thereby aggravating the heat transfer of the battery and causing the risk of thermal runaway. Utility Model Content

[0004] In view of this, the present invention provides a battery to solve the problem that the battery vibration affects the overcurrent capacity between the tab body and the terminal assembly.

[0005] This utility model provides a battery, including: 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 root near the battery cell body; a terminal assembly, welded to the tab body to form a first welding area, the first welding area having a first edge near the battery cell body; and a bracket, including a first support portion, the first support portion being disposed between the root and the first edge, the first support portion being abutting against the tab body.

[0006] Beneficial effects: When the battery vibrates during use, the cell vibrates along with the tab body. The tab body can abut against the first support part, which can reduce the degree of vibration of the tab body, thereby reducing the impact of vibration on the tab body. This can prevent the tab body from being torn at the edge of the first welding area due to increased tension from the end of the cell body and the welding area when the battery vibrates. It can also ensure the overcurrent capacity between the tab body and the terminal assembly, and prevent local overheating due to excessive resistance during charging and discharging, thereby avoiding potential safety risks such as thermal runaway. Attached Figure Description

[0007] 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.

[0008] Figure 1 This is a perspective view of a battery according to an embodiment of the present utility model;

[0009] Figure 2 for Figure 1 An exploded view of the battery shown.

[0010] Figure 3 for Figure 1 A partial top view of the battery shown;

[0011] Figure 4 for Figure 3 The battery shown is a cross-sectional view along line AA.

[0012] Figure 5 for Figure 4 The diagram shows the structure of the support frame.

[0013] Figure 6 for Figure 2 A 3D view of the bracket shown;

[0014] Figure 7 for Figure 6 The support shown is a stereoscopic view from another perspective;

[0015] Figure 8 for Figure 6 The side view of the bracket shown;

[0016] Figure 9 for Figure 8 The bracket shown is a cross-sectional view along the CC direction;

[0017] Figure 10 for Figure 2 The diagram shows a partial structural schematic of the battery cell.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Battery cell; 101. Battery cell body; 102. Electrode body; 1021. First welding area; 1022. Second welding area;

[0020] 2. Terminal assembly;

[0021] 3. Bracket; 301. First support part; 302. Second support part; 303. First connecting part; 304. Second connecting part; 305. Reinforcing rib; 306. Bracket body; 307. Fastening body;

[0022] 4. Housing; 401. Upper housing; 402. Lower cover. Detailed Implementation

[0023] 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.

[0024] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a battery is provided, comprising: a battery cell 1, an electrode assembly 2, and a support 3. 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 root near the battery cell body 101. The electrode assembly 2 is welded to the tab body 102 to form a first welding area 1021. The first welding area 1021 has a first edge near the battery cell body 101. The support 3 includes a first support portion 301, which is disposed between the root and the first edge. The first support portion 301 is abutted against the tab body 102.

[0026] In the battery using this embodiment, one end of the tab body located between the cell body and the welding area is subjected to a tensile force from the end of the cell body, and the other end is subjected to a tensile force from the welding area. When the battery vibrates during use, the cell 1 vibrates along with the tab body 102. The tab body 102 can abut against the first support 301. The first support 301 can reduce the vibration degree of the tab body 102, thereby reducing the impact of vibration on the tab body 102. This can prevent the increased tensile force from the end of the cell body and the welding area on the tab body during battery vibration, which could cause the edge of the tab body 102 at the first welding area to tear. This ensures the overcurrent capacity between the tab body 102 and the terminal assembly 2. During charging and discharging, excessive resistance will not cause local overheating, thereby avoiding potential safety risks such as thermal runaway.

[0027] In one embodiment, such as Figure 4 and Figure 5As shown, the bracket 3 also includes a second support portion 302, which is spaced apart from the first support portion 301 and is correspondingly arranged with the first welding area 1021. When the battery vibrates, the second support portion 302 limits the first welding area 1021 of the tab body 102, further reducing the vibration of the tab body 102. This further prevents the edge of the tab body 102 at the first welding point from tearing, ensuring the overcurrent capacity between the tab body 102 and the terminal assembly 2. During charging and discharging, excessive resistance will not cause local overheating, thus avoiding potential safety risks such as thermal runaway.

[0028] Furthermore, the second support portion 302 is abutted against the first welding area 1021. When the battery vibrates during use, the cell 1 vibrates along with the tab body 102. The first welding area 1021 can abut against the second support portion 302, effectively reducing the vibration of the tab body 102 and effectively preventing the tab body 102 from tearing at the edge of the first welding area 1021. This ensures that current is transmitted between the tab body 102 and the terminal assembly 2, reducing energy loss.

[0029] In one embodiment, such as Figure 4 As shown, along the first direction, the distance L1 between the first support 301 and the pole post assembly 2 is less than the distance L2 between the second support 302 and the pole post assembly 2.

[0030] Furthermore, the electrode assembly 2 includes an electrode and an adapter piece. The electrode body 102 is welded to the adapter piece, and the adapter piece is welded to the electrode. After the electrode body 102 is welded to the adapter piece, the thickness of the first welding area 1021 increases, and the electrode body 102 bends away from the end of the cell body 101, that is, close to the edge of the first welding area 1021, so the electrode body 102 becomes thicker.

[0031] Therefore, by setting L2 to be greater than L1, not only can the first support 301 better reduce the vibration of the tab body 102, but it can also prevent the second support 302 from excessively squeezing the tab body 102, thereby avoiding aggravating the tab tearing. This avoids serious safety problems such as internal short circuits and thermal runaway caused by the tab tearing, ensuring the safety of the battery during use.

[0032] Further, L1 is 0.6mm-2.5mm, and L2 is 0.8mm-3.5mm. Preferably, L1 is 1mm-2mm, and L2 is 1mm-3mm.

[0033] For example, L1 is 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; L2 is 0.8mm, 0.9mm, 1mm, 1... 0.1mm, 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, or within the range of any two of the above values.

[0034] In one embodiment, such as Figure 5 As shown, along the second direction, the width B1 of the first support portion 301 is 0.6mm-3.5mm, and the width B2 of the second support portion 302 is 0.6mm-3.5mm. The widths of the first support portion 301 and the second support portion 302 cannot be too large or too small. If the widths of the first support portion 301 and the second support portion 302 are too small, the area abutting against the tab body 102 will be too small, resulting in poor contact with the tab body 102. If the widths of the first support portion 301 and the second support portion 302 are too large, the area abutting against the tab body 102 will be too large, which may easily squeeze the tab body 102 and aggravate tearing of the tab body 102.

[0035] Therefore, the width B1 of the first support portion 301 and the width B2 of the second support portion 302 are within the above-mentioned range, and the area of ​​the first support portion 301 and the second support portion 302 abutting against the tab body 102 is appropriate. This not only ensures the effect of abutting against the tab body 102, but also avoids squeezing the tab body 102, thereby avoiding serious safety problems such as internal short circuits and thermal runaway caused by tab tearing, and ensuring the safety of the battery during use.

[0036] Preferably, B1 is 1mm-3mm and B2 is 1mm-3mm.

[0037] For example, B1 is 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, or any two of the above values. Within the range, B2 is 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, or falls within the range of any two of the above values.

[0038] Furthermore, B1 and B2 can be the same or different.

[0039] It should be noted that the first direction is the thickness direction of the battery, the second direction is the length direction of the battery, and the third direction is the width direction of the battery.

[0040] In one embodiment, such as Figure 4 and Figure 5 As shown, the surfaces of the first support portion 301 and the second support portion 302 facing the pole post assembly 2 are both planar. These planar surfaces, which are also the surfaces of the first support portion 301 and the second support portion 302 that contact the tab body 102, provide support to the tab body 102 and effectively distribute pressure, resulting in more stable and evenly distributed contact between the first support portion 301 and the second support portion 302 and the tab body 102.

[0041] In one embodiment, such as Figure 4 and Figure 5As shown, both the edges of the first support portion 301 and the second support portion 302 facing the electrode assembly 2 are chamfered. Chamfering the edges of the first support portion 301 and the second support portion 302 effectively removes sharp parts, preventing the sharp edges of the first support portion 301 and the second support portion 302 from cutting or damaging the electrode body 102. This avoids physical damage to the electrode body 102 caused by the sharp edges, reduces the risk of internal short circuits, and improves battery safety performance.

[0042] In one embodiment, such as Figure 8 and Figure 9 As shown, the support 3 also includes a first connecting part 303 and a second connecting part 304. The first connecting part 303 connects to the first end of the first support part 301 and the first end of the second support part 302. The second connecting part 304 connects to the second end of the first support part 301 and the second end of the second support part 302. The first support part 301, the second support part 302, the first connecting part 303, and the second support part 302 form a closed shape, which is rectangular or elliptical. The closed shape constitutes a complete frame structure, which significantly improves the overall rigidity and deformation resistance of the support 3, and has strong structural stability.

[0043] In one embodiment, the support 3 further includes a plurality of reinforcing ribs 305 located between the first connecting portion 303 and the second connecting portion 304, the reinforcing ribs 305 connecting the first support portion 301 and the second support portion 302. The reinforcing ribs 305 increase the internal support of the support 3, effectively improving the rigidity and deformation resistance of the entire structure, and enhancing the structural strength and stability of the support 3.

[0044] In one embodiment, such as Figure 10 As shown, the tab body 102 has a second welding area 1022, and the first welding area 1021 and the second welding area 1022 are arranged alternately. The tab body 102 includes a plurality of tab pieces, and the second welding area 1022 is used to weld the plurality of tab pieces. The first support portion 301 is correspondingly arranged with the second welding area 1022. The second welding area 1022 is used to weld the plurality of tab pieces together, thereby strengthening the structural strength of the tab body 102. It 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.

[0045] Specifically, the first support portion 301 and the second support portion 302 are located on the same side of the tab body 102, and the first support portion 301 and the second support portion 302 are located on both sides of the tab body 102 along with the pole assembly 2.

[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 housing 4 includes an upper housing 401 and a lower cover 402. The upper housing 401 has a receiving cavity for accommodating the battery cell 1, and the receiving cavity has an opening facing the lower cover 402. The lower cover 402 covers the opening of the upper housing 401. The battery is specifically a blade battery.

[0048] In one embodiment, the bracket 3 further includes a bracket body 306 and a fastening body 307. The bracket body 306 is disposed between the tab body 102 and the housing 4. The fastening body 307 is connected to the bracket body 306 and can be folded to one side of the bracket body 306. A placement space for accommodating the tab body 102 is formed between the fastening body 307 and the bracket body 306. The fastening body 307 has a protruding first support portion 301 and a second support portion 302 on the side facing the bracket body 306. The bracket 3 can effectively accommodate the tab body 102, and the protruding first support portion 301 and second support portion can press against the tab body 102, reducing the vibration of the tab body 102.

[0049] Specifically, the fastening body 307 and the bracket body 306 are integrally formed. It can be understood that the fastening body 307 and the bracket body 306 can also be formed separately and connected together.

[0050] Furthermore, the material of the support 3 is an insulating material. For example, the insulating material may be selected as one or more of polycarbonate (PC), polypropylene (PP), or a composite material of PC and acrylonitrile butadiene styrene copolymers (ABS).

[0051] Furthermore, the terminals, as the current output terminals of the battery, are used to connect to external busbars, etc., to realize series and parallel connections between batteries; the terminals can include positive terminals and negative terminals; the materials of the terminals can be aluminum, copper, copper-aluminum composites, etc.

[0052] 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.

[0053] 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 a positive active material, a conductive agent, a binder, etc. The positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 aforementioned electrical devices.

[0059] 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: 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) having a root near the battery cell body (101); The electrode assembly (2) is welded to the electrode body (102) to form a first welding area (1021), the first welding area (1021) having a first edge close to the cell body (101); The bracket (3) includes a first support portion (301), which is disposed between the root and the first edge, and the first support portion (301) is abutting against the tab body (102).

2. The battery according to claim 1, characterized in that, The bracket (3) further includes a second support part (302), which is spaced apart from the first support part (301) and is correspondingly arranged with respect to the first welding area (1021).

3. The battery according to claim 2, characterized in that, The second support (302) is disposed in contact with the first welding area (1021).

4. The battery according to claim 2, characterized in that, Along the first direction, the distance L1 between the first support (301) and the pole post assembly (2) is less than the distance L2 between the second support (302) and the pole post assembly (2).

5. The battery according to any one of claims 1 to 4, characterized in that, Along the second direction, the width B1 of the first support portion (301) is 0.6mm-3.5mm.

6. The battery according to any one of claims 2 to 4, characterized in that, The surfaces of the first support portion (301) facing the pole post assembly (2) and the second support portion (302) facing the pole post assembly (2) are both planar.

7. The battery according to any one of claims 2 to 4, characterized in that, The edges of the first support portion (301) facing the pole post assembly (2) and the edges of the second support portion (302) facing the pole post assembly (2) are both chamfered.

8. The battery according to any one of claims 2 to 4, characterized in that, The bracket (3) further includes a first connecting part (303) and a second connecting part (304). The first connecting part (303) connects the first end of the first support part (301) and the first end of the second support part (302). The second connecting part (304) connects the second end of the first support part (301) and the second end of the second support part (302). The first support part (301), the second support part (302), the first connecting part (303) and the second support part (302) form a closed shape, which is rectangular or elliptical.

9. The battery according to claim 8, characterized in that, The bracket (3) further includes a plurality of reinforcing ribs (305) located between the first connecting part (303) and the second connecting part (304), the reinforcing ribs (305) connecting the first support part (301) and the second support part (302).

10. The battery according to any one of claims 1 to 4, characterized in that, The electrode body (102) has a second welding area (1022), the first welding area (1021) and the second welding area (1022) are spaced apart, the electrode body (102) includes a plurality of electrode tabs, the second welding area (1022) is used to weld the plurality of electrode tabs, and the first support portion (301) is correspondingly provided with the second welding area (1022).

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