Battery

Abstract

The embodiment of the utility model provides a battery. The battery comprises a core package and a top cover assembly, the top wall and the side wall of the pole in the top cover assembly form an accommodating cavity in a surrounding manner so as to accommodate at least part of the tab extending from the core package body, so that the condition that the tab is connected to the outer surface of the pole to occupy too much space is avoided; under the condition that the volume and the weight of the battery are fixed, the accommodating cavities are formed in the pole columns to accommodate at least part of the pole lugs, so that the space and weight ratio of the pole lugs and the pole columns in the battery is greatly reduced, the volume and weight ratio of the core package body in the battery is improved, and the battery capacity and the energy density are further improved; on the basis that the accommodating cavity is arranged in the pole to accommodate the tab, the distance between the top wall of the pole and the top surface of the core package body is further designed to be less than or equal to 30mm, so that the occupied space between the pole and the core package body can be further reduced, the space ratio of the tab is further reduced, and the energy density of the battery is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery. Background Art

[0002] In related technologies, the battery core pack is welded to the terminal post via metal connectors. The core pack's tabs extend and are welded to the outer surface of the terminal post via the metal connectors. This results in the tabs, metal connectors, and terminal post occupying significant battery space, reducing the battery's energy density. Furthermore, the battery's top cover assembly and core pack also occupy space, reducing the battery's energy density. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery that can reduce the battery space occupied by the tabs and the poles, thereby improving the energy density of the battery.

[0004] An embodiment of the present application provides a battery, comprising:

[0005] A core package, comprising a core package body and a tab connected to the core package body;

[0006] A top cover assembly, the top cover assembly comprising a shell and a pole, the shell being disposed on the core package body, the pole being mounted on the shell, the top wall and side walls of the pole forming an accommodating cavity, and at least a portion of the pole lug being accommodated in the accommodating cavity;

[0007] Wherein, the distance between the top wall of the pole and the top surface of the core package body is d, and d≤30mm.

[0008] In one embodiment, the shell includes an upper shell and a lower shell, the lower shell is arranged on the core package body, the upper shell cover is arranged on the lower shell, the pole is installed between the upper shell and the lower shell, and the distance between the top wall of the pole and the top surface of the lower shell is d1, d1≤15mm.

[0009] In one embodiment, the distance between the bottom surface of the lower shell and the top surface of the core package body is d2, and d2≤10 mm.

[0010] In one embodiment, the electrode tab is connected to the top wall of the electrode column through a first welding portion.

[0011] In one embodiment, the tab includes a connecting section, a bent section, and an extending section, wherein the connecting section is connected to the core package body, and the bent section and the extending section are sequentially connected to the connecting section;

[0012] The extension section located at the end of the pole tab away from the core package body is connected to the top wall of the pole, and the first welding portion is located in the extension section.

[0013] In one embodiment, the electrode tab is connected to the side wall of the electrode column through a second welding portion.

[0014] In one embodiment, the bent section is connected to the side wall of the pole, and the second welding portion is located in the bent section.

[0015] In one embodiment, the angle α formed by the top wall of the pole and the side wall of the pole is an obtuse angle.

[0016] In one embodiment, there are at least two curved segments and at least two extending segments, and the two curved segments and the two extending segments are alternately connected to the connecting segment in sequence.

[0017] In one embodiment, the total welding area between the tab and the pole is S w , S w ≥200mm 2 .

[0018] The battery provided by the embodiment of the present application has the following beneficial effects: the battery of the present application includes a core pack and a top cover assembly. Compared with the related art, the top wall and side walls of the pole in the top cover assembly of the present application are enclosed to form a receiving cavity to receive at least a portion of the tab extending from the core pack body, thereby avoiding the situation where the tab is connected to the outer surface of the pole and occupies too much space; under the condition of a certain volume and weight of the battery, by providing a receiving cavity in the pole to receive at least a portion of the tab, the space and weight proportion of the tab and pole in the battery are greatly reduced, thereby increasing the volume and weight proportion of the core pack body in the battery, and further increasing the battery capacity and energy density; on the basis of providing a receiving cavity in the pole to receive the tab, the distance between the top wall of the pole and the top surface of the core pack body is further designed to be less than or equal to 30 mm, which can further reduce the space occupied between the pole and the core pack body, further compress the space proportion of the tab, and thus further increase the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic diagram of the cross-sectional structure of a battery provided in one embodiment of the present application;

[0021] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle;

[0022] Figure 3 for Figure 1 Schematic diagram of the dimensions of area A;

[0023] Figure 4 A schematic diagram of the cross-sectional structure of a battery provided in another embodiment of the present application;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of area A in the middle;

[0025] Figure 6 for Figure 4 Schematic diagram of the dimensions of area A;

[0026] Figure 7 A schematic diagram of a cross-sectional structure of a battery provided in yet another embodiment of the present application;

[0027] Figure 8 for Figure 7 A magnified schematic diagram of area A in the middle;

[0028] Among them, the reference numerals in the figures are:

[0029] Battery 100; core pack 110; core pack body 111; tab 112; connecting section 1121; bending section 1122; extending section 1123; top cover assembly 120; shell 121; pole 122; upper shell 1211; lower shell 1212; accommodating cavity M; first welding portion W1; second welding portion W2. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0031] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] Please also refer to Figures 1 to 3 , the battery 100 provided in one embodiment of the present application is now described. In this embodiment, the battery 100 includes a core pack 110, a top cover assembly 120 and a shell, as shown in FIG. Figure 1 shown.

[0035] Specifically, the core package 110 includes a core package body 111 and a tab 112 connected to the core package body 111. Optionally, the core package body 111 includes a protective film and a plurality of positive electrode sheets, a plurality of separators and a plurality of negative electrode sheets arranged in the protective film. The core package body 111 and the protective film are arranged in an outer shell (not shown). In the protective film, a plurality of positive electrode sheets and a plurality of negative electrode sheets are stacked in sequence, and a separator is arranged between every two adjacent positive electrode sheets and negative electrode sheets. The tab 112 includes at least one positive tab 112 and at least one negative tab 112. Specifically, each positive electrode sheet is connected to a cluster of positive electrode tabs 112, and a plurality of clusters of positive electrode tabs 112 are gathered together to form a positive electrode tab 112. Similarly, each negative electrode sheet is connected to a cluster of negative electrode tabs 112, and a plurality of clusters of negative electrode tabs 112 are gathered together to form a negative electrode tab 112.

[0036] Optionally, the battery 100 includes two core packs 110, a top cover assembly 120 is correspondingly arranged on the two core packs 110, and each core pack 110 is correspondingly provided with a pole ear 112, so that it is located in the accommodating cavity M of a pole 122 of the top cover assembly 120, and two pole ears 112 respectively connected to the two core packs 110 are provided, such as Figure 2 shown.

[0037] In this embodiment, the top cover assembly 120 includes a shell 121 and a pole 122. The shell 121 is arranged on the core package body 111 and covers the opening of the shell to encapsulate the core package 110. The pole 122 is installed in the shell 121. The top wall and side walls of the pole 122 are surrounded by a receiving cavity M, and at least part of the pole ear 112 is accommodated in the receiving cavity M. Figure 2 shown.

[0038] The distance between the top wall of the pole 122 and the top surface of the core package body 111 is d, d≤30mm, as shown in FIG. Figure 3 Optionally, d is 30mm, 29mm, 28mm, 27mm, 25mm, 24mm, 23mm, 22mm, 20mm, 18mm, 16mm, 15mm or 13mm, etc.

[0039] In the top cover assembly 120 of the present application, the top wall and side walls of the pole 122 are enclosed to form a receiving cavity M to accommodate at least a portion of the pole ear 112 extending from the core package body 111, thereby avoiding the situation where the pole ear 112 is connected to the outer surface of the pole 122 and occupies too much space; when the volume and weight of the battery 100 are certain, the receiving cavity M is provided in the pole 122 to accommodate at least a portion of the pole ear 112, which greatly reduces the space and weight share of the pole ear 112 and the pole 122 in the battery 100, thereby increasing the volume and weight share of the core package body 111 in the battery 100, and further increasing the capacity and energy density of the battery 100; on the basis of providing the receiving cavity M in the pole 122 to accommodate the pole ear 112, the distance between the top wall of the pole 122 and the top surface of the core package body 111 is further designed to be less than or equal to 30 mm, which can further reduce the space occupied by the pole 122 and the core package body 111, further compress the space share of the pole ear 112, and thus further improve the energy density of the battery 100.

[0040] Optionally, an explosion-proof valve (not shown) is further provided in the top cover assembly 120 for pressure relief and explosion prevention in the event of thermal runaway of the battery 100. Specifically, the positive electrode column 122 and the negative electrode column 122 are symmetrically arranged on both sides of the explosion-proof valve.

[0041] In this embodiment, the shell 121 includes an upper shell 1211 and an upper shell 1212. The upper shell 1212 is arranged on the core package body 111, and the upper shell 1211 is covered on the upper shell 1212, so that a storage space is formed between the upper shell 1211 and the upper shell 1212. The pole 122 is installed in the storage space between the upper shell 1211 and the upper shell 1212. The upper shell 1211 is provided with a through hole to allow the pole 122 to extend and connect to the external electrical equipment for electrical conduction. The upper shell 1212 is provided with an avoidance hole to avoid the pole ear 112, so that the pole ear 112 can extend from the avoidance hole and be accommodated in the storage cavity M in the pole 122. Specifically, the pole 122 includes a positive pole 122 and a negative pole 122, and the corresponding positive pole ear 112 and the positive pole 122 are correspondingly arranged, and the negative pole ear 112 and the negative pole 122 are correspondingly arranged.

[0042] like Figure 3 As shown, the distance between the top wall of the pole 122 and the top surface of the upper shell 1212 is d1, and d1≤15mm. Optionally, d1 is 15mm, 14mm, 13mm, 12mm, 11mm, 10mm, 9mm, 8mm or 7mm, etc. The space between the top wall of the pole 122 and the top surface of the upper shell 1212 is the height of the accommodating cavity M in the pole 122. The larger the distance d1 between the top wall of the pole 122 and the top surface of the upper shell 1212, the larger the volume of the tab 112 that can be accommodated, and the more space the pole 122 and the tab 112 occupy. Reducing the distance d1 between the top wall of the pole 122 and the top surface of the upper shell 1212 reduces the space occupied by the pole 122 and the tab 112, compresses the space share of the pole 122 and the tab 112, and further improves the energy density of the battery 100.

[0043] The distance between the bottom surface of the upper shell 1212 and the top surface of the core package body 111 is d2, d2≤10mm. Optionally, d2 is 10mm, 8mm, 7mm or 5mm, etc. It can be understood that the larger the distance d2 between the bottom surface of the upper shell 1212 and the top surface of the core package body 111 is, the larger the gap between the top cover assembly 120 and the core package body 111 is. Reducing the distance d2 between the bottom surface of the upper shell 1212 and the top surface of the core package body 111 further compresses the space occupied by the tab 112, thereby further improving the energy density of the battery 100.

[0044] Please refer again Figure 2In this embodiment, the tab 112 is connected to the top wall of the pole 122, and the specific connection method is welding. The tab 112 is welded to the top wall of the pole 122 to form a first welding portion W1. Specifically, the tab 112 includes a connecting section 1121, a bent section 1122, and an extended section 1123. The connecting section 1121 is connected to the core package body 111, and the bent section 1122 and the extended section 1123 are connected to the connecting section 1121 in sequence. Among them, the extended section 1123 located at the end of the tab 112 away from the core package body 111 is connected to the top wall of the pole 122, and the first welding portion W1 is located in the extended section 1123. The tab 112 is connected to the core package body 111 through the connecting section 1121, so that the connecting section 1121 of the tab 112 is connected to the pole piece; then it is extended and accommodated in the accommodating cavity M of the pole post 122 through the bending section 1122 and the extension section 1123. The bending section 1122 and the extension section 1123 of the tab 112 extend in the accommodating cavity M to compress the space occupied by the tab 112; finally, it is connected to the top wall of the pole post 122 through the extension section 1123 at the end to realize the connection between the tab 112 and the inner surface of the pole post 122, thereby realizing the electrical connection between the pole piece, the tab 112 and the pole post 122.

[0045] In this embodiment, the extension section 1123 at the end is a rectangular sheet-like structure, and the top wall of the pole 122 is rectangular. Therefore, the extension section 1123 can match the shape of the top wall of the pole 122, which is conducive to increasing the welding area. Optionally, the extension section 1123 at the end can also be triangular, circular, or other shapes. Accordingly, the top wall of the pole 122 is also triangular or circular, so that the extension section 1123 can match the shape of the top wall of the pole 122.

[0046] In this embodiment, one pole 122 is connected to two tabs 112, and the total area of ​​welding between the two tabs 112 and one pole 122 is S. w , S w ≥200mm 2 That is, in this embodiment, the total welding area is the sum of the welding areas of the two first welding portions W1. w 200mm 2 , 400mm 2 , 500mm 2 , 600mm 2 , 800mm 2 , 900mm 2 or 1000mm 2It is understandable that the larger the total area of ​​the welding between the tab 112 and the pole 122, the higher the current capacity between the tab 112 and the pole 122, and the smaller the welding resistance, thereby effectively reducing the heat generation between the tab 112 and the pole 122. However, the welding area between the tab 112 and the pole 122 is also limited by the size of the top wall of the pole 122. In this embodiment, the top wall area of ​​the pole 122 is 1100mm 2 , that is, the ratio of the actual welding area to the weldable area of ​​the top wall is greater than or equal to 2 / 11.

[0047] Optionally, the inner surface of the pole 122 includes a top wall and a side wall, and the tab 112 may be further connected to the side wall of the pole 122 via a second weld portion W2. That is, the tab 112 is connected to the top wall of the pole 122 via the first weld portion W1, and / or the tab 112 is connected to the side wall of the pole 122 via the second weld portion W2. In this embodiment, the tab 112 is connected to the top wall of the pole 122 via the first weld portion W1.

[0048] Please also refer to Figures 4 to 8 In some other embodiments, the tab 112 is not only welded to the top wall of the pole 122, but also welded to the side wall of the pole 122, thereby further increasing the connection area between the tab 112 and the pole 122, improving the flow capacity between the tab 112 and the pole 122, and reducing the internal resistance of the connection between the tab 112 and the pole 122.

[0049] like Figure 4 、 Figure 5 and Figure 6 As shown, Figure 4 、 Figure 5 and Figure 6 This is a battery 100 provided in another embodiment of the present application. The structure of this embodiment is substantially the same as that of the previous embodiment, with the difference being the structure of the pole 122 and the tab 112 and the specific connection relationship between the pole 122 and the tab 112 .

[0050] Since a top cover assembly 120 is correspondingly arranged on two core packages 110, and a core package 110 is correspondingly provided with a tab 112, two tabs 112 connected to the two core packages 110 are provided in the accommodation cavity M of a pole 122 of the top cover assembly 120. Figure 4 shown.

[0051] like Figure 5As shown, the two tabs 112 each include a connecting section 1121, a curved section 1122, and an extended section 1123. The curved section 1122 of one tab 112 is partially connected to one inner sidewall of the pole 122, and the extended section 1123 is connected to the top wall of the pole 122; the curved section 1122 of the other tab 112 is partially connected to the other inner sidewall of the pole 122, and the extended section 1123 is connected to the top wall of the pole 122. As a result, both tabs 112 are sequentially connected to the inner sidewall and top wall of the pole 122, greatly increasing the connection area between the tab 112 and the pole 122 and reducing the internal resistance of the connection.

[0052] Optionally, in this embodiment, the angle α formed by the top wall of the pole 122 and the side wall of the pole 122 is an obtuse angle, such as Figure 6 Specifically, α=92°, α=95°, α=100°, α=105°, α=110°, α=115°, α=120°, α=125°, α=130°, α=135°, α=140°, α=145°, or α=150°. It is understood that the tab 112 is welded to the side wall and top wall of the tab 112 via the bent section 1122 and the extended section 1123, respectively. The top wall and side wall of the pole 122 are adjacent to each other at an obtuse angle, so that the tab 112 can extend along the side wall and top wall. The curved section 1122 and the extended section 1123 of the tab 112 also match the shapes of the sidewall and top wall of the pole 122, respectively, thereby further increasing the contact area between the curved section 1122 and the sidewall of the pole 122, and the contact area between the extended section 1123 and the top wall of the pole 122. Optionally, the top wall of the pole 122 and the sidewall of the pole 122 are connected by a rounded corner to reduce stress at the connection.

[0053] Optionally, in some other embodiments, the top wall of the pole 122 is perpendicular to the side wall of the pole 122. Such an M-shaped accommodating cavity has a simple structure and is easy to manufacture.

[0054] Optionally, in this embodiment, the two tabs 112 are connected to the top wall of the pole 122 through the first welding portion W1, and are connected to the side wall of the pole 122 through the second welding portion W2. The total welding area S of the two tabs 112 and the pole 122 is w ≥200mm 2 .

[0055] like Figure 7 and Figure 8 As shown, Figure 7 and Figure 8 This is a battery 100 provided in another embodiment of the present application. Figure 1 The structures of the embodiments are substantially the same, and the differences lie in the specific structure of the tab 112 and the specific connection relationship between the pole 122 and the tab 112 .

[0056] In this embodiment, the battery 100 includes two core packs 110, and a top cover assembly 120 is correspondingly arranged on the two core packs 110. The multiple positive tabs 112 of the two core packs 110 are clustered together to form a positive tab 112, which is located in the accommodating cavity M of a pole 122 of the top cover assembly 120, and a tab 112 connected to both core packs 110 is provided. Figure 7 shown.

[0057] In this embodiment, the tab 112 includes two connecting sections 1121, two curved sections 1122, and two extension sections 1123. The two connecting sections 1121 are respectively connected to the two core package bodies 111, and the two connecting sections 1121 are retracted and alternately connected with the curved sections 1122 and the extension sections 1123 in sequence. It can be understood that by arranging the curved sections 1122 and the extension sections 1123 to be alternately connected, the tab 112 is accommodated in the accommodating cavity M of the pole 122 in the form of an "S", which greatly compresses the space occupied by the tab 112, so that the tab 112 can be accommodated in the accommodating cavity M with a smaller space. Optionally, the tab 112 can also be accommodated in the accommodating cavity M of the pole 122 in other forms.

[0058] like Figure 8 As shown, one curved section 1122 is connected to one side wall of the pole 122, another curved section 1122 is connected to the other side wall of the pole 122, and the extension section 1123 at the end is connected to the top wall of the pole 122. As a result, the tab 112 is sequentially connected to the side wall and top wall of the pole 122, greatly increasing the connection area between the tab 112 and the pole 122, improving the flow rate between the tab 112 and the pole 122, and reducing the internal resistance of the connection between the tab 112 and the pole 122. In addition, the two curved sections 1122 are respectively welded to the two side walls of the pole 122, which plays a role in fixing the "S" shape of the tab 112.

[0059] The above is a description of the battery 100 provided in the embodiment of the present application.

[0060] The battery provided in the embodiment of the present application includes a core pack and a top cover assembly; the top wall and side walls of the pole in the top cover assembly are arranged to form a accommodating cavity to accommodate at least a portion of the pole ear extending from the core pack body, thereby avoiding the situation where the pole ear is connected to the outer surface of the pole and occupies too much space; when the battery volume and weight are certain, the space and weight proportion of the pole ear and the pole in the battery are greatly reduced by setting an accommodating cavity in the pole to accommodate at least a portion of the pole ear, thereby increasing the volume and weight proportion of the core pack body in the battery, and further increasing the battery capacity and energy density; on the basis of setting an accommodating cavity in the pole to accommodate the pole ear, the distance between the top wall of the pole and the top surface of the core pack body is further designed to be less than or equal to 30 mm, which can further reduce the space occupied between the pole and the core pack body, further compress the space proportion of the pole ear, and thus further improve the energy density of the battery.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: A core package, comprising a core package body and a tab connected to the core package body; A top cover assembly, the top cover assembly comprising a shell and a pole, the shell being disposed on the core package body, the pole being mounted on the shell, the top wall and side walls of the pole forming an accommodating cavity, and at least a portion of the pole lug being accommodated in the accommodating cavity; Wherein, the distance between the top wall of the pole and the top surface of the core package body is d, and d≤30mm.

2. The battery according to claim 1, wherein The shell includes an upper shell and a lower shell, the lower shell is arranged on the core package body, the upper shell cover is arranged on the lower shell, the pole is installed between the upper shell and the lower shell, and the distance between the top wall of the pole and the top surface of the lower shell is d1, d1≤15mm.

3. The battery according to claim 2, wherein The distance between the bottom surface of the lower shell and the top surface of the core package body is d2, and d2≤10mm.

4. The battery according to claim 1, wherein The electrode tab is connected to the top wall of the electrode column through a first welding portion.

5. The battery according to claim 4, wherein The tab includes a connecting section, a bending section, and an extending section, wherein the connecting section is connected to the core package body, and the bending section and the extending section are sequentially connected to the connecting section; The extension section located at the end of the pole tab away from the core package body is connected to the top wall of the pole, and the first welding portion is located in the extension section.

6. The battery according to claim 5, wherein The electrode tab is connected to the side wall of the electrode column through a second welding portion.

7. The battery according to claim 6, wherein The bent section is connected to the side wall of the pole, and the second welding portion is located in the bent section.

8. The battery according to claim 7, wherein An included angle α formed by the top wall of the pole and the side wall of the pole is an obtuse angle.

9. The battery according to claim 5, wherein There are at least two curved sections and at least two extended sections, and the two curved sections and the two extended sections are alternately connected to the connecting section in sequence.

10. The battery according to any one of claims 1 to 9, characterized in that: The total welding area between the tab and the pole is S w , S w ≥200mm 2 .

Images