Battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery, which comprises a battery cell and a collector plate, the battery cell is provided with a tab, the collector plate is welded with the tab, the collector plate is provided with at least one welding area, at least two different welding spots are arranged in the at least one welding area, and the different welding spots comprise different sizes and / or different shapes. By arranging the welding spots with different sizes or shapes and reasonably distributing the positions of the welding spots with different sizes and shapes, the arrangement of the welding spots is optimized, so that the dense degree of the welding spots arranged in the collector plate is improved, the welding strength and reliability are improved, the high welding strength is realized on the premise of using low-power welding, and the welding quality is improved. And the distribution of the welding spots is optimized, so that the overall performance of the battery is improved, and the current conduction capability and the thermal management performance are improved. In addition, the utility model also discloses an electric device comprising the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery and electrical equipment. Background Art

[0002] With the advancement of battery technology, batteries are increasingly being used in mobile phones, computers, tablets, Bluetooth headsets, power tools, automobiles, energy storage, and other fields. People have higher requirements for battery charging time. To achieve high-rate charge and discharge for cylindrical lithium / sodium / lithium iron manganese phosphate batteries, a common design method to increase battery rate is to change the current flow path in the current collector and increase the current-carrying area of ​​the tab. One such approach is the full-tab design. This eliminates the need for die-cutting the uncoated current collector. Instead, the entire tab structure of the battery cell is flattened, and then the current collector plate is laser welded to the end face of the flattened cell. This method creates a shorter and more uniform current flow path through the tab, significantly reducing internal resistance. This means that the battery can more efficiently transmit current during high-power discharge, thereby improving battery performance and efficiency.

[0003] However, existing technologies present several challenges: The current collector plates and tabs of existing full-tab cylindrical batteries are welded using laser welding. This creates a flat surface between the collector plate and the battery cell, resulting in a thin tab area and a close weld interface to the separator. This easily transfers welding energy to the separator, causing it to shrink or even burn, leading to poor welds and battery short circuits. This results in a high weld scrap rate and poses safety risks. Reducing welding power can compromise the weld strength between the collector plate and tab, and can lead to a poor fit between the collector plate weld area and the battery cell end face.

[0004] Based on this, it is urgent to invent a battery. Utility Model Content

[0005] One of the purposes of the present invention is to provide a battery that can achieve high-strength welding at lower power while reducing thermal damage to the battery, and has a high density of welding points and good conductive effect in response to the shortcomings of the existing technology.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] A battery is provided, comprising a battery cell and a current collecting plate, wherein the battery cell has a tab, the current collecting plate is welded to the tab, and the current collecting plate has at least one welding area, wherein at least one welding area has at least two welding spots of different sizes and / or shapes.

[0008] Specifically, there is at least one smaller welding spot between two adjacent identical welding spots; and / or there is at least one welding spot with a different shape between two adjacent identical welding spots.

[0009] Specifically, the welding area is annular and is arranged around the axis of the collecting plate. When there are two or more welding areas, the welding areas are arranged in a surrounding and surrounded structure.

[0010] In the same welding area, all the welding points are arranged along the circumference of the corresponding welding area.

[0011] Specifically, the center line of each welding area is collinear with the center line of the current collecting plate.

[0012] Specifically, the collecting plate has a welding surface in its thickness direction, the welding points are located on the welding surface, the total area of ​​the welding points is A1, and the area of ​​the welding surface is A2, satisfying the relationship: A1>0.5A2.

[0013] Specifically, two adjacent welding points at least partially overlap.

[0014] Specifically, all the welding spots are circular in shape, and between two welding spots with the closest diameters, the diameter difference between the two welding spots is greater than 0.2 mm.

[0015] Specifically, the diameter of the welding spot is less than 3 mm.

[0016] Specifically, the battery core is a hollow structure with an opening, and the current collecting plate is provided with a central hole at a position corresponding to the opening.

[0017] The beneficial effects of the present invention are as follows: by setting welds of different sizes or shapes and rationally allocating the positions of welds of different sizes and shapes, the arrangement of the welds is optimized, thereby increasing the density of the welds in the current collecting plate, improving the strength and reliability of welding, using smaller welds at the same welding strength, the energy required for the welds is low, and the welding energy is not easily transmitted to the diaphragm, thus achieving high welding strength under the premise of using low-power welding, and since the distribution of the welds is optimized, the overall performance of the battery is also improved, including improvements in current conduction capability and thermal management performance.

[0018] The second object of the present utility model is to provide an electrical device comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of welding points of different sizes in the present invention;

[0021] Figure 2 This is a schematic diagram of the battery in the present utility model;

[0022] Figure 3 This is a schematic diagram of welding of different shapes of welding points in the present invention;

[0023] Figure 4 This is a schematic diagram of welding with overlapping welding points in the present invention;

[0024] Among them: 1-battery cell; 11-ear; 2-collecting plate; 21-welding area; 211-welding point; 2111-first welding point; 2112-second welding point; 2113-third welding point; 2114-fourth welding point; 212-center hole. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0026] In the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] Although the present application is disclosed as above in terms of a preferred embodiment, it is not intended to limit the claims. Any person skilled in the art may make several possible changes and modifications without departing from the concept of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

[0028] Batteries typically consist of tabs, cells, current collectors, and casings. The current collectors are used to connect the battery tabs to external circuits, helping current flow out of the cells and providing physical support. As battery energy density increases and people's requirements for battery charge and discharge time increase, the importance of the current collector in optimizing the current flow path and maintaining battery stability in high-power applications continues to increase.

[0029] The existing connection method usually uses a series of welds of the same size to connect the current collector and the tab. This method can ensure uniform current distribution and improve the stability of the mechanical connection. However, when setting larger welds, the welding energy required is large, and the welding energy is easily transferred to the diaphragm, causing the diaphragm to shrink or even burn. In addition, the coverage density of the current collector by large welds is low. The size and shape of the welds may not fully meet the actual current requirements, increasing local resistance and affecting the overall current transmission efficiency. When welding small welds, reducing the welding power will affect the welding strength between the current collector and the tab. The ideal welding solution needs to find a balance between weld size, welding energy and strength, and the impact of the welds on the current transmission efficiency of the tab. However, in actual production, it is difficult to take all these aspects into account at the same time, which affects the performance of the battery.

[0030] like Figure 1 As shown, the present application optimizes the arrangement of the weld points 211 by combining weld points 211 of different shapes and sizes and reasonably allocating the positions of weld points 211 of different sizes and shapes, thereby improving the density of the weld points 211 in the collecting plate, improving the strength and reliability of welding, and because the control method of welding quality in the existing technology is changed, the welding parameters can be more conveniently adjusted during the production process to adapt to different production needs and standards, thereby improving production efficiency and product consistency.

[0031] Implementation Method 1

[0032] like Figure 1 、 2 As shown, a battery includes a battery cell 1 and a current collecting plate 2, the battery cell 1 has a tab 11, the current collecting plate 2 is welded to the tab 11, and the current collecting plate 2 has at least one welding area 21, which is an area on the current collecting plate 2 for welding to the tab 11 of the battery cell 1. At least two welding spots 211 of different sizes and / or shapes are provided in the at least one welding area 21, wherein the different sizes refer to the different sizes of the areas occupied by the welding spots 211 after welding, and the different shapes refer to the different shapes formed by the welding spots 211 on the plane in the thickness direction of the current collecting plate 2.

[0033] For example, Figure 1As shown, a larger first welding point 2111 and a smaller second welding point 2112 can be set in the collecting plate 2 at the same time. Since the first welding point 2111 is set larger, higher power is required to heat and melt a larger area during welding to form a strong welding connection. Higher power can provide more heat to fully melt the solder, thereby ensuring the firmness of the first welding point 2111. However, due to the large energy of the first welding point 2111, it is necessary to ensure that the distance between the first welding points 2111 is far enough to avoid heat concentration affecting the diaphragm. The smaller second welding point 2112 has low welding energy and occupies a small area of ​​the collecting plate 2, so the selection of the position of the second welding point 2112 is more flexible. However, due to the low welding energy, it is easy to cause a cold weld. By arranging the first welding point 2111 and the second welding point 2112 at the same time The arrangement can achieve complementary advantages. There are more gaps between the first welding points 2111. By reasonably distributing the second welding points 2112 between the first welding points 2111, the density of the welding points 211 can be increased and the current distribution can be more accurately controlled, thereby reducing local resistance and improving the overall current transmission efficiency. After the first welding point 2111 is arranged, the current collecting plate 2 and the tab 11 are already stably combined together to provide a preliminary mechanical fixation. On this basis, when welding the second welding point 2112, the situation of cold welding can be reduced due to the stable position. Moreover, the arrangement of the second welding point 2112 also improves the overall welding strength. Under the same welding strength, the size of the first welding point 2111 can be reduced to prevent the energy of the first welding point 2111 from being too large and being transferred to the diaphragm to burn the diaphragm, thereby improving the safety performance of the battery.

[0034] like Figure 3 As shown, for example, a circular first weld 2111 and an elongated third weld 2113 can be set in the current collecting disk 2. Since setting the first weld 2111 as a circle easily concentrates energy, causing the energy to be transferred to the diaphragm and burn the diaphragm, the third weld 2113 can be set as a strip. Under the same size of welds 211, the use of the elongated third weld 2113 can disperse the welding energy more. Setting it between the first welds 2111 will not cause heat concentration to burn the diaphragm. By setting the third weld 2113 between the first welds 2111, the density of the welds 211 can also be increased, thereby improving the flow path of the current in the tab 11 to the current collecting disk 2 and improving the welding quality.

[0035] Preferably, at least one smaller weld spot 211 is located between two adjacent identical weld spots 211; and / or at least one weld spot 211 of a different shape is located between two adjacent identical weld spots 211. Providing smaller weld spots 211 between weld spots 211 of the same size and shape can fill the gaps between them, thereby increasing the density of the overall weld area 21. This design helps improve the uniformity of the weld connection and reduce the risk of cold welds and poor contact. Providing weld spots 211 of different shapes (such as circular, rectangular, hexagonal, etc.) between adjacent identical weld spots 211 can help better adapt to the actual shape of the weld area 21, improving the density and overall strength of the weld area 21. This strategy helps provide better coverage at different welding locations.

[0036] In some embodiments, a series of weld points 211 of increasing size can be set in the current collecting plate 2 at the same time, and these weld points 211 can be reasonably arranged. For example, the second largest weld point 211 is set in the gap of the largest weld point 211, and weld points 211 of different sizes are set by analogy. By setting a series of weld points 211 of increasing size in the current collecting plate 2 at the same time, the coverage rate of the weld points 211 on the current collecting plate 2 can be improved, thereby providing more paths for the electrical connection between the tab 11 and the current collecting plate 2, optimizing the conductive efficiency, and also having better welding strength.

[0037] Preferably, the welding area 21 is annular and arranged around the axis of the collecting plate 2. When there are two or more welding areas 21, each welding area 21 forms a surrounding and surrounded structure. Within the same welding area 21, all weld points 211 are arranged along the circumference of the corresponding welding area 21. This layout ensures that the welding areas 21 are evenly distributed around the collecting plate 2, thereby improving the stability and uniformity of the welding. The arrangement of the welding areas 21 around the axis of the collecting plate 2 helps to balance the stress distribution during the welding process and reduce the uneven mechanical stress caused by axis asymmetry.

[0038] For cylindrical full-tab batteries, setting the welding area 21 to be annular is a better choice. The annular welding area 21 is consistent with the winding form of the electrode of the battery cell 1, so that the welding area 21 can better adapt to the overall structure of the battery, enhance the stability and conductivity of the battery, and the electrode 11 of the full-tab battery also matches the annular design of the annular welding area 21, ensuring that the welding position and the electrode 11 are aligned, thereby improving the welding quality and current transmission efficiency.

[0039] Preferably, the center line of each welding area 21 is collinear with the center line of the collecting plate 2. The collinear design aligns each welding area 21 with the central axis of the collecting plate 2, ensuring the consistency of the weld points 211 in each area, thereby improving the overall welding quality and stability.

[0040] Preferably, the collecting plate 2 has a welding surface in the thickness direction thereof, and the welding point 211 is located on the welding surface. The total area of ​​the welding point 211 is A1, and the area of ​​the welding surface is A2, satisfying the relationship: A1>0.5A2. In order to ensure sufficient current conduction channels, reduce current density, and prevent heat generation in the welding area 21 during high-rate charging and discharging, and at the same time to ensure the welding strength within the welding area 21, the area of ​​the welding point 211 is set within the above-mentioned range.

[0041] Implementation Method 2

[0042] like Figure 4 As shown, preferably, two adjacent welds 211 at least partially overlap. Overlapping the welds 211 of the current collecting plate 2 allows for preheating of the next weld, i.e., the first weld 2111, after welding the fourth weld 2114. This allows the tab 11 to be welded in a higher temperature environment, reducing the welding energy required. Furthermore, when welding the first weld 2111, since the tab 11 and the current collecting plate 2 are connected as a whole after welding the fourth weld 2114, heat can be quickly transferred from the first weld 2111 to the fourth weld 2114, reducing the heat-affected depth of the weld and avoiding the safety issue of single-point penetration depth burning the diaphragm in discrete-point welding mode. The fourth weld 2114 is larger than the first weld 2111.

[0043] In some embodiments, by first welding a small weld 211 and then welding a large weld 211 at the position of the small weld 211, after the small weld 211 is welded, the pole ear 11 is connected to the collecting plate 2. When welding is performed again for the second time, a smaller welding power will not cause a cold weld. This is because the small weld 211 first forms a preliminary connection, connecting the pole ear 11 and the collecting plate 2 together, ensuring good basic contact, reducing contact thermal resistance, and smoothly transferring heat during subsequent welding. This method can reduce the heat affected depth caused by one-time welding of a large weld 211, thereby reducing the risk of welding defects.

[0044] Preferably, all welds 211 are circular in shape, and among the two welds 211 with the closest diameters, the diameter difference between the two welds 211 is greater than 0.2 mm. By making the diameter difference of different welds 211 greater than 0.2 mm, the requirements for the welding process are lower, making the production process more stable and easier to control.

[0045] Preferably, the diameter of the welding spot 211 is less than 3 mm. The smaller the diameter of the welding spot 211 is, the smaller the heat-affected zone generated during the welding process is, which helps to control the distribution of heat and reduce the impact on surrounding materials.

[0046] Preferably, the battery cell 1 is a hollow structure with an opening, and a center hole is provided in the current collecting plate 2 at a position corresponding to the opening. The hollow structure is provided in the battery cell 1 to facilitate the injection of electrolyte, and the electrolyte can infiltrate the battery along the hollow structure, and the center hole 212 of the current collecting plate 2 is provided to provide an inlet for liquid injection corresponding to the hollow structure.

[0047] The welding spot 211 can be formed by various welding methods such as spot welding, laser welding, and ultrasonic welding.

[0048] Preferably, laser welding is used to form the weld spot 211 . Laser welding allows for very precise control of welding position and depth, which facilitates flexible setting of the weld spot 211 .

[0049] Implementation 3

[0050] The battery of this application is suitable for use in a variety of electrical devices, such as consumer electronics (mobile phones, laptops, tablets, etc.); household appliances (cordless vacuum cleaners, smart home devices, etc.); electric vehicles (electric bicycles, electric scooters, electric cars, etc.); portable devices (handheld tools, outdoor equipment, etc.); and medical devices (portable medical instruments, health monitoring equipment, etc.).

[0051] The above description shows and describes several preferred embodiments of the present invention. However, as mentioned above, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention through the above teachings or the techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A battery, characterized in that: The invention comprises a battery core (1) and a current collecting plate (2), wherein the battery core (1) has a pole lug (11), the current collecting plate (2) is welded to the pole lug (11), the current collecting plate (2) has at least one welding area (21), and the at least one welding area (21) has at least two welding points (211) of different sizes and / or shapes.

2. The battery according to claim 1, wherein: There is at least one smaller welding point (211) between two adjacent identical welding points (211); And / or, there is at least one welding point (211) with a different shape between two adjacent identical welding points (211).

3. The battery according to claim 2, wherein: The welding area (21) is annular and is arranged around the axis of the collecting plate (2). When there are two or more welding areas (21), the welding areas (21) are in a surrounding and surrounded structure. In the same welding area (21), all the welding points (211) are arranged along the circumference of the corresponding welding area (21).

4. The battery according to claim 3, wherein: The center line of each welding area (21) is collinear with the center line of the collecting plate (2).

5. The battery according to claim 1, wherein: The collecting plate (2) has a welding surface in its thickness direction, the welding points (211) are located on the welding surface, the total area of ​​the welding points (211) is A1, and the area of ​​the welding surface is A2, satisfying the relationship: A1>0.5A2.

6. The battery according to claim 1, characterized in that: Two adjacent welding points (211) at least partially overlap.

7. The battery according to claim 1, characterized in that: All the welding spots (211) are circular in shape, and among the two welding spots (211) with the closest diameters, the diameter difference between the two welding spots (211) is greater than 0.2 mm.

8. The battery according to claim 6, characterized in that: The diameter of the welding spot (211) is less than 3 mm.

9. The battery according to claim 1, characterized in that: The battery core (1) is a hollow structure with an opening, and the current collecting plate (2) is provided with a central hole (212) at a position corresponding to the opening.

10. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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