Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment, the battery comprises a shell, the shell comprises a shell body and at least one end cover which are connected with each other, the part of the circumferential edge of the end cover is integrally connected with the shell body, the shell body defines a containing cavity with at least one open end, and the end cover seals the opening; each end cover is provided with at least one of a positive pole and a negative pole, and the number of the end covers is in one-to-one correspondence with the number of the openings; the battery cell is clamped in the accommodating cavity, a positive plate and a negative plate are arranged on the battery cell, the positive plate is mechanically connected with the positive pole and electrically conducted, and the negative pole is mechanically connected with the negative plate and electrically conducted. According to the battery provided by the invention, the structural arrangement of the battery is simplified, and meanwhile, as the part of the circumferential edge of the end cover and the shell body are integrally formed, the area, needing to be processed, between the circumferential edge of the end cover and the shell body is reduced, so that the reliability of connection between the end cover and the shell body can be improved, and the service life of the battery is further prolonged.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery and an electrical device. Background Art

[0002] Traditional square batteries are mainly composed of an aluminum shell, a cover plate assembly, and positive and negative transfer sheets, with relatively high costs, a large variety of materials, and a large number of welds. The new integrated battery case and cover structure ingeniously combines the battery case and the cover plate assembly into one. In the integrated design, one large surface of the aluminum shell is higher than the other several surfaces by a certain height. On the raised part, there are pole columns and explosion-proof valves. The end cover is integrated into the aluminum shell, the transfer sheet design is cancelled, and the ultrasonic welding of the pole ears is cancelled. After the wound core is inserted into the case, the pole ears are directly welded to the pole columns, and then the raised part of the cover plate is bent, and then laser welding is performed around the perimeter. While ensuring the battery manufacturing process, costs are saved and the number of welds is reduced. Utility Model Content

[0003] This application provides a battery to solve the problem of low efficiency caused by the complex assembly of traditional batteries that require a top cover and transfer sheets to connect the electrode plates and the pole columns.

[0004] The battery according to this application includes:

[0005] A case, the case includes a case body and at least one end cover connected to each other. A part of the circumferential edge of the end cover is integrally formed and connected to the case body. The case body defines a receiving cavity with at least one open end. The end cover seals the opening. At least one of a positive pole column and a negative pole column is provided on the end cover. The number of end covers corresponds one-to-one with the number of openings;

[0006] A battery cell, the battery cell is clamped in the receiving cavity. Positive and negative electrode plates are provided on the battery cell. The positive electrode plate is mechanically connected and electrically conducted with the positive pole column, and the negative pole column is mechanically connected and electrically conducted with the negative electrode plate.

[0007] For the battery according to this application, the other part of the circumferential edge of the end cover is welded and connected to the case body.

[0008] Optionally, the number of end covers and the number of openings are both one, and both the positive pole column and the negative pole column are provided on the same end cover.

[0009] Optionally, the end cover includes a first edge, a second edge, a third edge, and a fourth edge that are sequentially connected end to end in the circumferential direction. The first edge of the case body and the end cover are integrally formed and connected. The second edge, the third edge, and the fourth edge are welded and connected to the case body.

[0010] Optionally, connection parts are provided at the second edge, the third edge, and the fourth edge. The connection parts are embedded in the accommodation cavity and are welded to the inner wall of the housing body, or the connection parts abut against the outer wall of the housing body and are welded to the outer wall of the housing body.

[0011] Optionally, two adjacent connection parts are disconnected from each other.

[0012] Optionally, the connection part is in the shape of a rectangular plate.

[0013] For the battery according to the present application, when the number of end caps is one, an explosion-proof valve is provided on the end cap; when the number of end caps is two, an explosion-proof valve is provided on at least one of the end caps.

[0014] For the battery according to the present application, the battery is an aluminum-shell lithium battery.

[0015] The present application further provides an electrical device, including the battery according to any of the above solutions.

[0016] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0017] For the battery provided by the embodiment of the present application, during assembly, the battery cell is first inserted into the accommodation cavity through an opening. After adjusting the position of the battery cell, the positive electrode sheet is welded to the positive electrode column, and the negative electrode sheet is welded to the negative electrode column. Then, the end cap is bent to seal the opening, and the edges of the remaining part of the end cap are sealed with the housing body, thereby completing the installation of the battery. Then, a series of processes such as baking, liquid injection, standing, formation, and grading are normally carried out on the battery, and finally the production and preparation of the battery are completed. The ultrasonic welding process of the pole ear (positive pole ear or negative pole ear) and the adapter plate is cancelled, and the design of the adapter plate is cancelled. In this way, the structural setting of the battery is simplified. At the same time, since a part of the circumferential edge of the end cap is integrally formed with the housing body, the area that needs to be processed between the circumferential edge of the end cap and the housing body is reduced, so that the reliability of the connection between the end cap and the housing body can be improved, and further the service life of the battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments that comply with the present invention, and are used together with the specification to explain the principles of the present invention.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated. The drawings in the figures do not constitute a scale limitation.

[0021] Figure 1 It is a perspective view of a battery to be assembled provided by an embodiment of the present application;

[0022] Figure 2 It is a cross-sectional view of a battery to be assembled provided by an embodiment of the present application.

[0023] Description of reference numerals:

[0024] Housing 10, housing body 11, end cover 12, positive terminal 13, negative terminal 14, battery cell 20, positive plate 21, explosion-proof valve 30. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] For ease of description, spatial relative relationship terms may be used in the text to describe the relative position relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" other elements or features will subsequently be oriented as "above" or "on top of" other elements or features. Therefore, the exemplary term "below" can include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0028] As Figure 1 and Figure 2 shown, the battery according to an embodiment of the present application includes a housing 10 and a battery cell 20.

[0029] Specifically, the housing 10 includes a housing body 11 and at least one end cap 12 that are connected to each other. A portion of the circumferential edge of the end cap 12 is integrally connected to the housing body 11. The housing body 11 defines a receiving cavity that is open at at least one end. The end cap 12 seals the opening. At least one of a positive terminal 13 and a negative terminal 14 is provided on the end cap 12. The number of end caps 12 corresponds one-to-one with the number of openings. The battery cell 20 is clamped in the receiving cavity. A positive electrode tab 21 and a negative electrode tab are provided on the battery cell 20. The positive electrode tab 21 is mechanically connected and electrically conducted to the positive terminal 13, and the negative terminal 14 is mechanically connected and electrically conducted to the negative electrode tab.

[0030] That is to say, the number of end caps 12 corresponds one-to-one with the number of openings. In some embodiments, the housing 10 includes one end cap 12. One end of the housing body 11 defines an opening. The end cap 12 is connected to the housing body 11 and is used to seal the opening. In some embodiments, the housing 10 includes two end caps 12. Both ends of the housing body 11 define openings. Each end cap 12 is used to seal the corresponding opening.

[0031] Further, when the positive electrode post 13 and the negative electrode post 14 are provided on the same end cap 12, the housing 10 may be configured to include one end cap 12. One end of the housing body 11 defines an opening, and the end cap 12 is connected to the housing body 11. The end cap 12 is used to seal the opening. Alternatively, the housing 10 may be configured to include two end caps 12. Both ends of the housing body 11 define openings, and each end cap 12 is used to seal the corresponding opening. When the positive electrode post 13 and the negative electrode post 14 are respectively located on one end cap 12, the housing 10 is configured to include two end caps 12. Both ends of the housing body 11 define openings, and each end cap 12 is used to seal the corresponding opening.

[0032] Among them, the positive electrode plate 21 and the positive electrode post 13 are mechanically connected and electrically conductive. The positive electrode plate 21 and the positive electrode post 13 may be snap-connected or welded. Generally, in order to enhance the durability and anti-drop performance of the battery and ensure the contact area between the positive electrode plate 21 and the positive electrode post 13, the positive electrode plate 21 and the positive electrode post 13 are welded. The negative electrode plate and the negative electrode post 14 are mechanically connected and electrically conductive. The negative electrode plate and the negative electrode post 14 may be snap-connected or welded. Generally, in order to enhance the durability and anti-drop performance of the battery and ensure the contact area between the negative electrode plate and the negative electrode post 14, the negative electrode plate and the negative electrode post 14 are welded.

[0033] In addition, the battery may be a cylindrical battery, a square shell battery, or other types of battery categories, such as various types including lithium-ion batteries, lithium polymer batteries, and lithium-sulfur batteries. The present application does not make any restrictions.

[0034] For the battery according to the embodiment of the present application, during assembly, the battery cell 20 is first inserted into the accommodation cavity through an opening. After adjusting the position of the battery cell 20, the positive electrode plate 21 is welded to the positive electrode post 13, and the negative electrode plate is welded to the negative electrode post 14. Then, the end cap 12 is bent to seal the opening, and the edges of the remaining part of the end cap 12 are sealed with the housing body 11, thereby completing the installation of the battery. Then, a series of processes such as baking, liquid injection, standing, and formation and grading are normally performed on the battery, and finally the production and preparation of the battery are completed. The ultrasonic welding process of the electrode tab (positive electrode tab or negative electrode tab) and the adapter plate is cancelled, and the design of the adapter plate is cancelled. In this way, the structural setting of the battery is simplified. At the same time, since a part of the circumferential edge of the end cap 12 is integrally formed with the housing body 11, the area that needs to be processed between the circumferential edge of the end cap 12 and the housing body 11 is reduced, thereby improving the reliability of the connection between the end cap 12 and the housing body 11, and further extending the service life of the battery.

[0035] In a specific embodiment, the materials are prepared on the battery cell 20 manufacturing line or the pilot line. The raw materials go through a series of processes such as positive and negative electrode mixing, positive and negative electrode coating, positive and negative electrode rolling, and positive and negative electrode die-cutting to complete the production of the wound core. The previous process steps are the same as those of the traditional battery cell 20 production.

[0036] The wound battery cell 20 is hot-pressed. After the hot-pressing of the A and B cores is completed, the battery cell 20 is automatically or manually bonded and cored through equipment, which is the same as the production of traditional battery cells 20.

[0037] The hot-pressed battery cell 20 is directly wrapped with a mylar film (polyester film, also called mylar paper or insulating tape, etc.) into the housing 10. After the battery cell 20 is placed in the housing 10, the pole ears of the core are directly welded to the positive and negative pole columns of the integrated structure of the new shell cover, and then the protruding cover part is bent. The bending process usually goes through three stages, namely: elastic deformation, plastic deformation, and bending forming.

[0038] After bending, the end cover 12 and the housing body 11 are welded to complete the assembly of the battery.

[0039] After the assembly of the battery cell 20 is completed, a series of processes such as baking, liquid injection, standing, and formation and grading of the battery cell 20 are carried out normally.

[0040] For the battery according to the embodiment of the present application, the other parts of the circumferential edge of the end cover 12 are welded to the housing body 11.

[0041] Specifically, the other parts of the circumferential edge of the end cover 12 are welded to the housing body 11. In this way, the reliability of the connection between the end cover 12 and the housing body 11 and the sealing performance after the end cover 12 and the housing body 11 are installed and fixed can be increased.

[0042] As Figure 1 and Figure 2 shown, in some embodiments, the number of end covers 12 and the number of openings are both one, and the positive pole column 13 and the negative pole column 14 are both arranged on the same end cover 12. This design not only simplifies the battery assembly process, but also improves the production efficiency of the battery. In addition, since the positive pole column 13 and the negative pole column 14 are both located at the same end, the electrical connection of the battery is more convenient, which is beneficial to the design and manufacture of the battery module. In some application scenarios, this design can also reduce the connection electricity between battery components, thereby reducing the risk of liquid leakage and air leakage and improving the safety and reliability of the battery.

[0043] In some embodiments, the end cover 12 includes a first edge, a second edge, a third edge, and a fourth edge that are sequentially connected end to end in the circumferential direction. The housing body 11 and the first edge of the end cover 12 are integrally formed and connected, and the second edge, the third edge, and the fourth edge are welded to the housing body 11.

[0044] It can be understood that when assembling the battery, the battery cell 20 can be first placed into the accommodation cavity. At this time, the end cover 12 and a large surface of the housing body 11 are in the same plane. Then, the end cover 12 is bent to form a first edge, and the second edge, the third edge, and the fourth edge are welded to the housing body 11. This can enable the end cover 12 to avoid the battery cell 20 when the battery cell 20 is not installed in the accommodation cavity, which is beneficial to the installation of the battery cell 20. After that, the second edge, the third edge, and the fourth edge are welded to the housing body 11 to improve the sealing performance after the connection between the end cover 12 and the housing body 11.

[0045] In some embodiments, connection portions are provided at the second edge, the third edge, and the fourth edge. The connection portions are embedded in the accommodation cavity and welded to the inner wall of the housing body 11, or the connection portions abut against the outer wall of the housing body 11 and are welded to the outer wall of the housing body 11.

[0046] Specifically, connection portions are provided at the second edge, the third edge, and the fourth edge. By welding the connection portions to the housing body 11, the welding contact area between the connection portions and the housing body 11 can be increased, thereby improving the welding reliability and sealing performance between the connection portions and the housing body 11.

[0047] Among them, the connection portions are embedded in the accommodation cavity and welded to the inner wall of the housing body 11, or the connection portions abut against the outer wall of the housing body 11 and are welded to the outer wall of the housing body 11, which means that in some embodiments, the connection portions are embedded in the accommodation cavity and welded to the inner wall of the housing body 11, and in some embodiments, the connection portions abut against the outer wall of the housing body 11 and are welded to the outer wall of the housing body 11.

[0048] In addition, the connection portions at each edge (the second edge, the third edge, and the fourth edge) can be a whole or multiple spaced connection portions. Among them, the shape of the connection portions can be a rectangular flat shape, a square flat shape, or a circular, semi-circular, semi-elliptical, and other flat structures with similar structures.

[0049] In some embodiments, two adjacent connection portions are disconnected from each other. In this way, when bending the top cover along a large surface of the housing body 11, the two connection portions can be more easily abutted against the corresponding positions on the housing body 11 respectively, thereby simplifying the fixed assembly of the battery.

[0050] In some embodiments, the connection portions are in the shape of rectangular plates, which can enhance the sealing performance between each part along the length direction of each edge (the second edge, the third edge, and the fourth edge) and the housing body 11.

[0051] Such as Figure 1As shown, for the battery according to the embodiment of the present application, when the number of end caps 12 is one, an explosion-proof valve 30 is provided on the end cap 12; when the number of end caps 12 is two, an explosion-proof valve 30 is provided on at least one of the end caps 12.

[0052] It can be understood that setting the explosion-proof valve 30 on the battery has some main functions: preventing the internal pressure of the battery from being too high. When the internal gas pressure of the battery is too high, such as in the case of short circuit, overcharge, etc., the explosion-proof valve 30 will automatically open to release the excessive pressure and avoid battery explosion; protecting the battery from external extrusion. Even if a strong extrusion force is applied externally, the explosion-proof valve 30 can release the pressure in time to avoid battery damage; improving the safety of battery use. The explosion-proof valve 30 is an important part of the battery safety protection and can release pressure in time when the battery fails or has abnormal conditions, greatly reducing the risk of battery explosion.

[0053] Among them, when the capacity of the battery is moderate, an explosion-proof valve 30 can be provided on the end cap 12. When the battery capacity is large or the energy density is high, usually for the safety of the battery, multiple explosion-proof valves 30 can be provided to improve the safety of battery use.

[0054] The battery according to the embodiment of the present application is an aluminum-shell lithium battery. For example, the battery is a cylindrical aluminum-shell lithium battery or a square aluminum-shell lithium battery.

[0055] The present application also provides an electrical device including the battery in any of the above embodiments.

[0056] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that alternative or additional steps may be used.

[0057] Although terms such as first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used in the text. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0058] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A battery, characterized in that, Comprising: A housing, the housing includes a housing body and at least one end cap that are connected to each other. A part of the circumferential edge of the end cap is integrally formed and connected to the housing body. The housing body defines a receiving cavity with at least one open end. The end cap seals the opening. At least one of a positive terminal and a negative terminal is provided on the end cap. The number of end caps corresponds one-to-one with the number of openings. An electric core, the electric core is clamped in the receiving cavity. A positive electrode tab and a negative electrode tab are provided on the electric core. The positive electrode tab is mechanically connected and electrically conducted with the positive terminal, and the negative terminal is mechanically connected and electrically conducted with the negative electrode tab.

2. The battery according to claim 1, wherein The other part of the circumferential edge of the end cap is welded to the housing body.

3. The battery according to claim 2, characterized in that, The number of end caps and the number of openings are both one, and both the positive terminal and the negative terminal are provided on the same end cap.

4. The battery according to claim 3, characterized in that, The end cap includes a first edge, a second edge, a third edge, and a fourth edge that are sequentially connected end to end in the circumferential direction. The first edge of the housing body and the end cap are integrally formed and connected. The second edge, the third edge, and the fourth edge are welded to the housing body.

5. The battery according to claim 4, characterized in that, Connection portions are provided at the second edge, the third edge, and the fourth edge. The connection portions are embedded in the receiving cavity and welded to the inner wall of the housing body, or the connection portions abut against the outer wall of the housing body and are welded to the outer wall of the housing body.

6. The battery according to claim 5, wherein, Two adjacent connection portions are disconnected from each other.

7. The battery according to claim 5, characterized in that, The connection portion is in the shape of a rectangular plate.

8. The battery according to any one of claims 1-7, characterized in that, When the number of end caps is one, an explosion-proof valve is provided on the end cap; when the number of end caps is two, an explosion-proof valve is provided on at least one of the end caps.

9. The battery according to any one of claims 1-7, characterized in that, The battery is an aluminum-shell lithium battery.

10. An electrical device, characterized in that, Including the battery according to any one of claims 1-9.

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