A battery and an electrical device

Abstract

This utility model provides a battery and an electrical device, relating to the field of battery technology. The battery includes at least one cell assembly, and each cell assembly includes a bare cell and an adapter plate. There are two bare cells, each with multiple tabs extending from it, and all the tabs in each bare cell are welded to form a converged portion. The adapter plate is located between the two converged portions, and its opposite sides are welded to the two converged portions respectively. Based on the above, compared with the traditional method of welding all tabs to the same side of the adapter plate, this application adopts a double-sided welding method, that is, welding both sides of the adapter plate to the two converged portions respectively. Based on this, the problem of welding thick tabs, which originally required direct processing, is transformed into two welding operations on the thinner converged portions, thereby reducing the thickness of each weld by half, and thus improving the overall stability and reliability of the welding process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0002] With continuous innovation in battery manufacturing technology, the short-blade battery has emerged as a new type of battery structure. The short-blade battery employs a unique stacking process, with its electrode plates designed in a blade shape with tabs extending from both sides. This structural design significantly improves the utilization of internal battery space, thereby achieving higher energy density and superior fast-charging performance.

[0003] In related technologies, the number of electrode stacking layers in short-blade batteries has been significantly increased to meet the demands for higher energy density and fast charging capabilities. However, the inventors have discovered that traditional welding processes have significant shortcomings when dealing with thick tabs, easily leading to problems such as weak welds, poor quality, and incomplete welds. Utility Model Content

[0004] The purpose of this invention is to provide a battery and electrical device that can divide the thick tabs that originally needed to be directly welded into two parts, which are then welded to the adapter piece respectively, thereby effectively reducing the thickness and difficulty of a single weld and improving the stability and reliability of the weld.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, the present invention provides a battery comprising at least one cell assembly, and each cell assembly comprising:

[0007] Bare battery cell, there are two bare battery cells, each bare battery cell has multiple tabs extending out, and all the tabs in each bare battery cell are welded together to form a converged part;

[0008] The adapter plate is located between the two gathering parts, and the two opposite sides of the adapter plate are welded to the two gathering parts respectively.

[0009] In an optional implementation, the sum of the number of tabs in each gathering section is not less than sixty.

[0010] In an optional implementation, the total thickness of the two bare cells in a cell assembly is not less than 32 mm.

[0011] In an optional embodiment, the battery further includes a cover plate and terminals, the terminals being disposed through the cover plate, and the terminals including a first connecting portion and a second connecting portion connected to each other.

[0012] The first connection part is located on the outside of the cover plate and is used to connect to the external circuit; the second connection part is located on the inside of the cover plate and penetrates the cover plate, and is welded to the adapter piece in all the battery cell assemblies.

[0013] In an optional embodiment, there are two second connecting parts, which are located at both ends of the cover plate; the middle part of the adapter piece is connected to two adjacent gathering parts, and the two ends are connected to the two second connecting parts respectively.

[0014] In an optional embodiment, the second connecting part is connected to the adapter plate by laser welding.

[0015] In an optional implementation, all tabs in each bare cell are ultrasonically welded to form a convergence section.

[0016] In an optional implementation, the two opposite sides of the adapter plate are connected to the two retractable parts by laser welding.

[0017] In an optional implementation, the bare cells are fabricated using a lamination process.

[0018] Secondly, this utility model provides an electrical device, including a battery as described in any of the foregoing embodiments.

[0019] The beneficial effects of the battery and electrical equipment provided in this embodiment of the present invention include:

[0020] This utility model provides a battery and an electrical device, relating to the field of battery technology. The battery includes at least one cell assembly, and each cell assembly includes a bare cell and an adapter plate. There are two bare cells, each with multiple tabs extending from it, and all the tabs in each bare cell are welded to form a converged portion. The adapter plate is located between the two converged portions, and its opposite sides are welded to the two converged portions respectively. Based on the above, compared with the traditional method of welding all tabs to the same side of the adapter plate, this application adopts a double-sided welding method, that is, welding both sides of the adapter plate to the two converged portions respectively. Based on this, the problem of welding thick tabs, which originally required direct processing, is transformed into two welding operations on the thinner converged portions, thereby reducing the thickness of each weld by half, and thus improving the overall stability and reliability of the welding process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the adapter plate and two bare battery cells provided in this embodiment;

[0023] Figure 2 This is a structural schematic diagram of the cover plate and its outer first connecting portion provided in this embodiment;

[0024] Figure 3 This is a structural schematic diagram of the cover plate and the second connecting part on its inner side provided in this embodiment;

[0025] Figure 4 This is a schematic diagram of the structure of the cover plate, electrode post, adapter plate and bare cell provided in this embodiment;

[0026] Figure 5 This is a schematic diagram of the battery manufacturing process provided in this embodiment.

[0027] Icons: 100 - bare cell; 110 - gathering part; 300 - adapter plate; 500 - cover plate; 700 - terminal post; 710 - first connection part; 730 - second connection part. Detailed Implementation

[0028] As the demand for higher energy density and fast charging capabilities in short-blade batteries increases, the number of electrode stacking layers has significantly increased. However, traditional welding processes are prone to problems such as weak welding, poor quality, and incomplete welds when dealing with the resulting thick electrode tabs.

[0029] To address the aforementioned problems, this invention provides a battery and its manufacturing method, which can divide the thick tabs that originally required direct welding into two parts, which are then welded to the adapter piece respectively. This effectively reduces the thickness and difficulty of a single welding operation and improves the stability and reliability of the welding process.

[0030] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0036] Please see Figure 1 This utility model provides a battery for use in electrical devices, comprising at least one cell assembly, and each cell assembly including a bare cell 100 and an adapter plate 300. There are two bare cells 100, each with multiple tabs extending from it, and all tabs in each bare cell 100 are welded to form a converged portion 110. It is understood that by pre-integrating the multiple tabs in each bare cell 100 into a converged portion 110, the complexity of subsequent welding processes can be effectively reduced, while ensuring that the welding points are more concentrated and stable, thereby significantly improving welding efficiency and quality.

[0037] The adapter piece 300 is located between the two gathering portions 110, and the two opposite sides of the adapter piece 300 are welded to the two gathering portions 110 respectively. Based on the above, compared with the conventional method of welding all tabs to the same side of the adapter piece 300, this application adopts a double-sided welding method, that is, welding both sides of the adapter piece 300 to the two gathering portions 110 respectively. Based on this, the problem of welding thick tabs, which originally required direct processing, is transformed into two welding operations on the thinner gathering portions 110, thereby reducing the thickness of each weld by half, and thus improving the overall stability and reliability of the welding process.

[0038] To meet the high energy density requirements of high-performance batteries, the total number of tabs in each gathering section 110 is not less than sixty. Furthermore, in the same cell assembly, the number of tabs in the gathering sections 110 of each bare cell 100 can be the same or different; this embodiment does not impose any limitation.

[0039] Furthermore, since optimizing the thickness of the bare cell 100 is also an important means of achieving high energy density, in an optional embodiment, the total thickness of the two bare cells 100 in a cell assembly is not less than 32 mm, which can also improve energy density and ensure that performance requirements are met.

[0040] Based on the above, it should be further explained that the number of tabs in each gathering section 110 and the sum of the thicknesses of the two bare cells 100 in each cell assembly can be satisfied individually or simultaneously. The two conditions do not conflict and both effectively contribute to achieving the goal of high energy density.

[0041] Please see Figure 2 and Figure 3 The battery also includes a cover plate 500 and terminals 700, with the terminals 700 penetrating through the cover plate 500. The terminals 700 include a first connecting portion 710 and a second connecting portion 730 connected to each other. The first connecting portion 710 is located on the outer side of the cover plate 500 and is used for connection to an external circuit; the second connecting portion 730 is located on the inner side of the cover plate 500 and penetrates through it, and is welded to the adapter piece 300 in all cell assemblies. Based on the design of the terminals 700 penetrating the cover plate 500 and divided into inner and outer parts, current can be conducted from inside the bare cell 100 through the adapter piece 300 and the second connecting portion 730 to the first connecting portion 710, and finally to the external circuit.

[0042] In particular, compared to the T2C (Tab to Cover) process, which often requires higher laser energy or more complex welding parameter control when handling thick tabs, this invention significantly reduces the thickness of a single weld by dividing the tab into two parts and welding them separately to the adapter piece 300, thus lowering the requirements for equipment performance. Subsequently, the welding of the adapter piece 300 to the second connecting part 730 ensures the stability and efficiency of current transmission. In other words, this invention effectively solves the limitations of the T2C process in welding thick tabs, significantly reduces the welding difficulty, and enhances the stability of the internal electrical connection.

[0043] Further, please refer to Figure 4 To fully utilize the blank area of ​​the adapter plate 300 and simultaneously increase the current intensity, two second connection portions 730 are provided, located at opposite ends of the cover plate 500. By increasing the number of second connection portions 730 and distributing them at both ends of the cover plate 500, the current conduction path is effectively expanded, and the current density per unit path is reduced. This reduces the thermal effect and resistance loss caused by current concentration, thereby improving the overall performance and safety of the battery.

[0044] Correspondingly, the middle part of the adapter plate 300 is connected to the two adjacent retracting portions 110, and both ends are connected to the two second connecting portions 730 respectively. Based on the above configuration, the adapter plate 300 can make full use of its blank area to evenly distribute the current of the retracting portion 110 to the two second connecting portions 730, thereby achieving efficient transmission of current intensity.

[0045] In addition, it should be noted that when there are two or more battery cell assemblies, all adapter pieces 300 can be welded into a whole and then connected to the second connection part 730, or they can be connected to the second connection part 730 separately. The embodiments provided in this application do not limit this.

[0046] In the embodiments provided by this utility model, considering that ultrasonic welding is a highly efficient welding method, it can quickly achieve the initial integration of multi-layer tabs. All tabs in each bare cell 100 are ultrasonically welded to form a convergence portion 110. Furthermore, considering that laser welding has the characteristics of high precision and high strength, it can ensure a firm connection between the adapter piece 300 and the convergence portion 110, improving the reliability of the overall structure. The opposite sides of the adapter piece 300 are laser welded to the two convergence portions 110 respectively. In addition, the second connecting portion 730 is also laser welded to the adapter piece 300.

[0047] Furthermore, the bare cell 100 is manufactured using a stacking process. That is, the bare cell 100 consists of multiple alternately arranged separators, positive electrode plates, and negative electrode plates. To ensure that the positive and negative electrode plates are stacked alternately to form the electrode pairs required for the electrochemical reaction, each positive and negative electrode plate is separated by a separator. The stacking sequence is generally separator, positive electrode plate, separator, negative electrode plate, and separator again. This sequence is repeated continuously until the desired battery capacity and size are achieved.

[0048] It should also be noted that on one side of the bare cell 100 manufactured using the lamination process, there is a positive electrode tab extending from the positive electrode plate, while on the opposite side, there is a negative electrode tab extending from the negative electrode plate. In conjunction with the specific details of the aforementioned embodiments, the two convergence portions 110 connected to the adapter piece 300 can be formed by welding the positive electrode tabs on the same side of the two bare cells 100 separately, or by welding the negative electrode tabs on the same side of the two bare cells 100 separately.

[0049] In particular, since the positive electrode tab is generally made of aluminum alloy and has a certain material thickness, the positive electrode end of the battery can be designed similarly to the aforementioned embodiment, with bare cell 100, adapter 300, terminal post 700 and cover plate 500.

[0050] Please see Figure 5 Taking the battery provided by this utility model as an example, its manufacturing process is as follows:

[0051] For each of the two bare cells 100 in each cell assembly, the tabs in each bare cell 100 are soldered together to form a gathering part 110 on each bare cell 100.

[0052] In some optional embodiments, ultrasonic welding technology is used to weld all the tabs on each bare cell 100 together to form a concentrated and stable convergence portion 110, thereby reducing the complexity of subsequent welding processes and improving welding efficiency and quality. Optionally, the number of tabs in each convergence portion 110 is ensured to be no less than 60, in order to meet the high energy density requirements of high-performance batteries while avoiding problems caused by excessive weld thickness.

[0053] Subsequently, in each cell assembly, an adapter piece 300 is disposed between two gathering portions 110, and the two opposite sides of the adapter piece 300 are connected to the two gathering portions 110 respectively by welding.

[0054] In some alternative embodiments, laser welding technology is used to securely connect both sides of the adapter plate 300 to the two retractable portions 110. It is understood that by using the adapter plate 300 to disperse the thick tabs that would otherwise require direct welding, the thickness of a single weld is reduced, and welding stability is improved.

[0055] Next, the terminal post 700 on the cover plate 500 is welded to the adapter piece 300 in all the cell assemblies.

[0056] In some alternative embodiments, by dividing the pole 700 into inner and outer parts (a first connection part 710 and a second connection part 730) and connecting it to the adapter piece 300, current can be ensured to be conducted from the inside to the external circuit.

[0057] Finally, all the battery cell assemblies are installed into the housing, and all the retractable parts 110 are folded in the same direction, so that the cover plate 500 connected to the retractable parts 110 via the adapter plate 300 is folded together and mates with the open end of the housing.

[0058] Understandably, by folding and retracting the cover plate 500 and the opening end of the casing, a sealed battery casing is formed by the folding and retracting part 110, preventing the external environment from affecting the inside of the battery.

[0059] In summary, this utility model provides a battery comprising bare cells 100 and adapter pieces 300. Two bare cells 100 are provided, each with multiple tabs extending from it, and all tabs in each bare cell 100 are welded to form a converged portion 110. The adapter piece 300 is located between the two converged portions 110, and its opposite sides are welded to both converged portions 110 respectively. Based on the above, compared to the conventional method of welding all tabs to the same side of the adapter piece 300, this application employs a double-sided welding method, that is, welding both sides of the adapter piece 300 to the two converged portions 110 respectively. Therefore, the problem of welding thick tabs, which originally required direct processing, is transformed into two welding operations on the thinner converged portions 110, thereby reducing the thickness of each weld by half, and thus improving the overall stability and reliability of the welding process.

[0060] In addition, this utility model also provides an electrical device that includes the battery in the aforementioned embodiment. Therefore, compared with the traditional method of welding all the tabs to the same side of the adapter plate 300, this electrical device also adopts a double-sided welding method, that is, welding both sides of the adapter plate 300 to the two gathering parts 110 respectively, thereby effectively reducing the thickness and difficulty of a single welding, and improving the stability and reliability of the welding. Further details will not be elaborated here.

[0061] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery, characterized in that, It includes at least one cell assembly, and each of the cell assemblies includes: The bare battery cell (100) has two parts, each bare battery cell (100) has multiple tabs extending out, and all the tabs in each bare battery cell (100) are welded to form a folded portion (110); An adapter piece (300) is located between the two gathering portions (110), and the two opposite sides of the adapter piece (300) are respectively welded to the two gathering portions (110).

2. The battery according to claim 1, characterized in that, Each of the aforementioned gathering parts (110) The sum of the number of electrodes mentioned in the text is not less than sixty.

3. The battery according to claim 1, characterized in that, In one of the battery cell assemblies, the total thickness of the two bare cells (100) is not less than 32 mm.

4. The battery according to claim 1, characterized in that, The battery also includes a cover plate (500) and a terminal post (700), the terminal post (700) being disposed through the cover plate (500), and the terminal post (700) including a first connecting part (710) and a second connecting part (730) connected to each other; The first connecting part (710) is located on the outside of the cover plate (500) and is used to connect to an external circuit; the second connecting part (730) is located on the inside of the cover plate (500) and passes through the cover plate (500), and is welded to the adapter piece (300) in all the battery cell assemblies.

5. The battery according to claim 4, characterized in that, There are two second connecting parts (730), and the two second connecting parts (730) are located at both ends of the cover plate (500); the middle part of the adapter piece (300) is connected to the two adjacent gathering parts (110), and the two ends are connected to the two second connecting parts (730) respectively.

6. The battery according to claim 4, characterized in that, The second connecting part (730) is connected to the adapter piece (300) by laser welding.

7. The battery according to any one of claims 1 to 6, characterized in that, All the tabs in each of the bare cells (100) are formed into a folded portion (110) by ultrasonic welding.

8. The battery according to any one of claims 1 to 6, characterized in that, The two opposite sides of the adapter plate (300) are connected to the two gathering parts (110) respectively by laser welding.

9. The battery according to any one of claims 1 to 6, characterized in that, The bare battery cell (100) is manufactured using a stacking process.

10. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 9.

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