Single battery, battery and electric device

Abstract

The utility model provides a single battery, a battery and a power utilization device, and belongs to the technical field of batteries. The single battery comprises a pole piece, the pole piece has a width direction, the pole piece comprises a body, at least one first tab and at least one second tab, and the first tab and the second tab are connected to the same side of the body along the width direction; the maximum sizes of the first tab and the second tab in the width direction are the same, the side, away from the body, of the first tab is arc-shaped in the direction perpendicular to the large surface of the pole piece, and the side, away from the body, of the second tab is linear. According to the pole piece, the side, away from the body, of the first pole lug is arranged to be arc-shaped, so that the pole piece is not prone to being turned over in the winding process, the side, away from the body, of the second pole lug is linear, the linear structure is easier to cut, the production difficulty of the second pole lug can be reduced, and therefore the production efficiency of the pole piece is improved; therefore, the stability and the production efficiency of the pole piece are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of single battery, in particular to a single battery, a battery and an electric device. BACKGROUND

[0002] With the rapid development of new energy industry, the demand gap for automobile power battery is getting bigger and bigger. Power battery manufacturing plants have sprung up at home and abroad. The electrode segment before the manufacturing process of the pole piece of the single battery has many design defects. During the winding process of the pole piece, the tab is prone to folding, which affects the production quality and production efficiency. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a single battery, a battery and an electric device.

[0004] In a first aspect, the present application provides a single battery, comprising a pole piece, the pole piece having a width direction, the pole piece comprising:

[0005] a body;

[0006] at least one first tab and at least one second tab, the first tab and the second tab being connected to the same side of the body along the width direction;

[0007] The maximum size of the first tab and the second tab in the width direction is the same, the pole piece has a large face, in a direction perpendicular to the large face of the pole piece, the projection of the side of the first tab away from the body on a plane parallel to the large face of the pole piece is arc-shaped, and the projection of the side of the second tab away from the body on a plane parallel to the large face of the pole piece is straight line-shaped.

[0008] In some embodiments, as viewed in a direction perpendicular to the large face of the pole piece, the outer contour shape of the first tab is semicircular, and the outer contour shape of the second tab is trapezoidal.

[0009] In some embodiments, the pole piece has a length direction perpendicular to the width direction, the first tab is one, the second tab is a plurality, the plurality of second tabs are arranged at intervals, and the first tab is arranged at one end of the plurality of second tabs along the length direction.

[0010] In some embodiments, along the length direction, the width of the plurality of second tabs gradually decreases from both ends of the pole piece to the middle of the pole piece.

[0011] In some embodiments, along the length direction, the second tab has two first side edges arranged opposite to each other, one side of the second tab away from the body is a second side edge, and the second side edge is arranged between the two first side edges.

[0012] An angle between the first side edge and one side of the body along the width direction is α, where α satisfies 86°≤α≤145°.

[0013] In some embodiments, the first side edge is provided with at least one first arc segment adjacent to one side of the body, and a convex surface of the first arc segment faces the other first side edge.

[0014] In some embodiments, an arc length of the first arc segment ranges from 1mm to 20mm.

[0015] In some embodiments, two ends of the second side edge along the length direction are respectively provided with first bevels, one end of the first bevel is connected with the second side edge, and the other end of the first bevel is connected with the first side edge.

[0016] In some embodiments, two ends of the second side edge along the length direction are respectively provided with second arc segments, one end of the second arc segment is connected with the second side edge, and the other end of the second arc segment is connected with the first side edge.

[0017] In some embodiments, an arc length of the second arc segment ranges from 1mm to 20mm, and / or, an arc length of the second arc segment ranges from 1mm to 20mm.

[0018] In a second aspect, the present application provides a battery cell, comprising the monomer battery cell.

[0019] In a third aspect, the present application provides a power consumption device, comprising the battery cell, and the battery cell is used for providing electric energy.

[0020] Embodiments of the present application have the following advantages: by arranging the first tab and the second tab on the same side of the body, and making the side of the first tab away from the body arc-shaped, the first tab is less likely to be folded during winding, thereby ensuring the stability of the first tab; in addition, the side of the second tab away from the body is linear, the linear structure is easier to cut, which can reduce the production difficulty of the second tab, thereby improving the production efficiency of the tab, thereby ensuring the stability and production efficiency of the tab.

[0021] In order to make the above objectives, characteristics and advantages of the present application more apparent and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0023] Figure 1 A structural schematic diagram of a first embodiment of a single battery provided by some embodiments of the present application is shown;

[0024] Figure 2 A structural schematic diagram of a second embodiment of a single battery provided by some embodiments of the present application is shown;

[0025] Figure 3 A structural schematic diagram of a third embodiment of a single battery provided by some embodiments of the present application is shown; Figure 2 An enlarged view of part A in FIG. 5;

[0026] Figure 4 A structural schematic diagram of a fourth embodiment of a single battery provided by some embodiments of the present application is shown;

[0027] Figure 5 A structural schematic diagram of a fifth embodiment of a single battery provided by some embodiments of the present application is shown;

[0028] Figure 6 An enlarged view of part B in FIG. 6; Figure 5 An enlarged view of part B in FIG. 6;

[0029] Figure 7 A structural schematic diagram of a fifth embodiment of a single battery provided by some embodiments of the present application is shown.

[0030] Main element symbol explanation:

[0031] 10-tab; 100-body; 200-first tab; 300-second tab; 310-first side edge; 320-second side edge; 330-first arc segment; 340-first bevel; 350-second arc segment.

[0032] X-width direction; Y-length direction. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be understood as a limitation to the present application.

[0034] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "overlying," "atop," and "on" as used herein refer to the relative positioning of elements when attached to one another as an aid to description. Relative terms are used herein to describe the relationships between elements as they are oriented in a particular direction.

[0035] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances.

[0036] In addition, the terms "first", "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the template herein is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] As Figures 1 to 7 Some embodiments of the present application provide a single battery, mainly for preventing the tab from being folded, while improving the production efficiency of the tab 10, which has a width direction X.

[0039] The tab 10 includes a body 100, at least one first tab 200 and at least one second tab 300.

[0040] The body 100 is a rectangular sheet structure. The number of first tabs 200 and second tabs 300 can be one, two or any number of values, which can be specifically set according to actual conditions.

[0041] The first tab 200 and the second tab 300 are both connected to the same side of the body 100 along the width direction X. By arranging the first tab 200 and the second tab 300 on the same side, the effective space utilization rate of the single battery can be increased, the manufacturing difficulty can be reduced, and the production efficiency can be improved. In addition, this design reduces the internal space occupation of the battery, making the battery structure more compact, which is beneficial to improve the energy density and volume utilization rate of the battery. Therefore, arranging the first tab 200 and the second tab 300 on the same side of the body 100 can optimize the tab distribution, reduce the internal resistance of the single battery, and improve the overall performance of the battery. In addition, by arranging the first tab 200 and the second tab 300 on the same side of the body 100, the internal resistance and power loss can be reduced, the power transmission efficiency can be improved, and the overall performance and safety of the battery can be improved.

[0042] During the production of the tab sheet 10, the tabs may be warped or folded during the winding process due to the structure and shape of the tabs.

[0043] The tab sheet 10 has a large face, which is a surface with the largest surface area of the tab sheet 10.

[0044] Therefore, in the present embodiment, the maximum dimensions of the first tab 200 and the second tab 300 in the width direction X are the same, so as to ensure the welding area between the first tab 200 and the body 100 and the welding area between the second tab 300 and the body 100, thereby improving the stability of the connection between the first tab 200 and the body 100 and the connection between the second tab 300 and the body 100.

[0045] In the direction perpendicular to the large face of the tab sheet 10, the projection of the side of the first tab 200 away from the body 100 on the plane parallel to the large face of the tab sheet 10 is arc-shaped, which is convex in the direction away from the body 100. It can be understood that the length of the first tab 200 in the width direction X gradually decreases from the side close to the body 100 to the side away from the body 100, so that the first tab 200 is not easy to be folded during the winding process of the tab sheet 10, thereby ensuring the stability of the first tab 200.

[0046] In addition, in the direction perpendicular to the large face of the tab sheet 10, the projection of the side of the second tab 300 away from the body 100 on the plane parallel to the large face of the tab sheet 10 is straight line-shaped. It can be understood that the straight line-shaped structure is easier to cut, which can reduce the production difficulty of the second tab 300, thereby improving the production efficiency of the tab sheet 10.

[0047] As shown in FIG. 1, the first tab 200 and the second tab 300 are arranged on the same side of the body 100 along the width direction X. Figure 1As shown, in some embodiments of the present application, the first tab 200 has a semicircular outer profile shape as viewed in a direction perpendicular to the major surface of the pole piece 10. It can be understood that the length of the semicircular shape in the width direction X gradually decreases from the side close to the body 100 to the side away from the body 100, i.e., the length of the side of the first tab 200 away from the body 100 is less than the length of the side of the first tab 200 close to the body 100. By reducing the length of the side of the first tab 200 away from the body 100, the stability of the first tab 200 is improved, and the first tab 200 is prevented from being folded over.

[0048] In addition, the second tab 300 has a trapezoidal outer profile shape as viewed in a direction perpendicular to the major surface of the pole piece 10. It can be understood that, since the maximum dimension of the first tab 200 and the second tab 300 in the width direction X is the same, the maximum width of the first tab 200 is adjacent to the body 100, and thus the maximum width of the second tab 300 is also adjacent to the body 100. That is, the length of the second tab 300 in the width direction X gradually decreases from the side close to the body 100 to the side away from the body 100, i.e., the length of the side of the second tab 300 away from the body 100 is reduced to improve the stability of the second tab 300, thereby preventing the second tab 300 from being folded over.

[0049] It should be noted that, by setting the outer profile of the first tab 200 to be semicircular, i.e., the outer profile of the second tab 300 is formed by a smooth curve, the cutting difficulty of the first tab 200 is simplified. In addition, by setting the outer profile of the second tab 300 to be trapezoidal, i.e., the outer profile of the second tab 300 is formed by a plurality of straight line segments, the cutting difficulty of the second tab 300 is reduced, thereby improving the cutting efficiency of the second tab 300, and thus improving the production efficiency of the pole piece 10.

[0050] Since the tab arranged at one end of the pole piece 10 in the length direction Y of the pole piece 10 is located at the outermost side during winding, the tab at the outermost side is prone to being folded over.

[0051] Based on this, Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in some embodiments of this application, the electrode 10 has a length direction Y perpendicular to the width direction X. There is one first electrode tab 200 and multiple second electrode tabs 300, spaced apart. The first electrode tab 200 is located at one end of the multiple second electrode tabs 300 along the length direction Y. It can be understood that since the first electrode tab 200 is located at one end of the length direction Y of the body 100, after the electrode 10 is wound, the first electrode tab 200 will be on the outermost side after winding. Because the side of the first electrode tab 200 away from the body 100 is arc-shaped, by reducing the length of the side of the first electrode tab 200 away from the body 100, the first electrode tab 200 is prevented from folding, thereby ensuring the stability of the first electrode tab 200 and the second electrode tab 300 during the winding process of the electrode 10, ensuring production quality, and thus improving production efficiency.

[0052] Because the inner ring length is shorter than the outer ring length during the electrode winding process, if the spacing between adjacent electrodes is equal, the electrode distribution will be irregular during the winding of electrode sheet 10.

[0053] like Figure 1 As shown, in some embodiments of this application, along the length direction Y, the second electrode 300 has two first sides 310 disposed opposite to each other, and the side of the second electrode 300 opposite to the body 100 is a second side 320, which is disposed between the two first sides 310.

[0054] The angle between the first side 310 and one side of the body 100 along the width direction X is α, where α satisfies: 86°≤α≤145°. It can be understood that the value of α can be any value between 86° and 145°, and can be specifically set according to the actual situation.

[0055] It should be noted that if the length difference between the side of the second tab 300 adjacent to the body 100 and the side of the second tab 300 away from the body 100 is too large, it will affect the current conduction efficiency of the second tab 300; if the length difference between the side of the second tab 300 adjacent to the body 100 and the side of the second tab 300 away from the body 100 is too small, it will cause the second tab 300 to easily fold over when the electrode sheet 10 is wound.

[0056] Therefore, by controlling the included angle between the first side edge 310 and one side of the body 100 along the width direction X, the length of the second lug 300 away from one side of the body 100 along the length direction Y is adjusted, so as to control the length difference between the side of the second lug 300 adjacent to one side of the body 100 and the side of the second lug 300 away from the body 100, so as to ensure the current guiding efficiency and smoothness of the second lug 300 while preventing the second lug 300 from being folded, and improving the stability of the second lug 300.

[0057] As shown in Figure 2 and Figure 3 in some embodiments of the present application, the first side edge 310 adjacent to one side of the body 100 is provided with at least one first arc segment 330, and the convex surface of the first arc segment 330 faces the other first side edge 310. It should be noted that the number of first arc segments 330 can be one, two or any number of values, which can be specifically set according to actual conditions.

[0058] As shown in Figure 2 and Figure 3 in some embodiments, the first side edge 310 adjacent to one side of the body 100 is provided with one first arc segment 330, so as to increase the distance between the two first arc segments 330 adjacent to one side of the body 100, which helps to increase the super welding area, thereby improving the stability of the connection between the second side edge 320 and the body 100.

[0059] As shown in Figure 5 and Figure 6 in some embodiments, the first side edge 310 adjacent to one side of the body 100 is provided with two first arc segments 330 connected to each other, so as to increase the distance between the two first arc segments 330 adjacent to one side of the body 100, which helps to increase the super welding area, thereby improving the stability of the connection between the second side edge 320 and the body 100.

[0060] As shown in Figure 4 in some embodiments of the present application, both ends of the second side edge 320 along the length direction Y are respectively provided with first bevels 340, one end of the first bevel 340 is connected with the second side edge 320, and the other end of the first bevel 340 is connected with the first side edge 310.

[0061] Since the outer contour of the second tab 300 is trapezoidal, and along the width direction X, the length of the second tab 300 gradually decreases from the side adjacent to the body 100 to the side away from the body 100. By arranging the first bevel 340 at both ends of the second side edge 320, that is, the first bevel 340 is located at the side of the second tab 300 away from the body 100, the width of the side of the second tab 300 away from the body 100 is further reduced, thereby avoiding the situation that the second tab 300 is folded during the winding process of the tab sheet 10.

[0062] In some embodiments, the two first bevels 340 are symmetrically arranged at both ends of the second side edge 320 along the length direction Y.

[0063] As shown in FIG. 1, in some embodiments of the present application, the two ends of the second side edge 320 along the length direction Y are respectively provided with a second arc segment 350, one end of the second arc segment 350 is connected with the second side edge 320, and the other end of the second arc segment 350 is connected with the first side edge 310. Figure 7

[0064] It should be noted that the concave surface of the second arc segment 350 faces the body 100, which ensures the smoothness of the connection between the first side edge 310 and the second side edge 320, facilitates cutting forming, facilitates cutting, improves cutting efficiency.

[0065] In some embodiments of the present application, the arc length of the first arc segment 330 ranges from 1-20 mm. It can be understood that the arc length of the first arc segment 330 can be any range in 1-20 mm, 2-20 mm, 3-20 mm, 4-20 mm, 5-20 mm, 6-20 mm, 7-20 mm, 8-20 mm, 9-20 mm, 10-20 mm, 11-20 mm, 12-20 mm, 13-20 mm, 14-20 mm, 15-20 mm, 16-20 mm, 17-20 mm, 18-20 mm, 19-20 mm, which can be specifically set according to actual conditions.

[0066] In some embodiments, the arc length of the second arc segment 350 ranges from 1-20 mm. It can be understood that the arc length of the second arc segment 350 can be any range in 1-20 mm, 2-20 mm, 3-20 mm, 4-20 mm, 5-20 mm, 6-20 mm, 7-20 mm, 8-20 mm, 9-20 mm, 10-20 mm, 11-20 mm, 12-20 mm, 13-20 mm, 14-20 mm, 15-20 mm, 16-20 mm, 17-20 mm, 18-20 mm, 19-20 mm, which can be specifically set according to actual conditions.

[0067] ​It should be noted that if the arc length of the first tab 200 is too small, the width of the first tab 200 will be too small, and the narrower tab 10 will reduce the contact area of the battery, resulting in a decrease in the output power and efficiency of the battery; if the arc length of the first tab 200 is too large, the width of the first tab 200 will be too large, although it can increase the contact area of the battery and improve the output power and efficiency of the battery. However, excessive current density can cause the battery to overheat or short circuit, thereby affecting the service life and safety of the battery.

[0068] Based on this, in some embodiments of the present application, the arc length of the first tab 200 ranges from 5 to 20 mm. It can be understood that the arc length of the first tab 200 can be any range of 5-20 mm, 6-20 mm, 7-20 mm, 8-20 mm, 9-20 mm, 10-20 mm, 11-20 mm, 12-20 mm, 13-20 mm, 14-20 mm, 15-20 mm, 16-20 mm, 17-20 mm, 18-20 mm, 19-20 mm, which can be set according to actual conditions.

[0069] It should be noted that the measurement method of the arc length can be measured by a length measuring instrument after the tab 10 is flattened after the monomer battery is disassembled.

[0070] By adjusting the arc length range of the first tab 200, the effective contact area of the first tab 200 is controlled while the output power and efficiency of the battery are ensured, and the situation of the first tab 200 being folded during the winding process of the tab 10 is prevented.

[0071] The present application provides an electrode assembly, comprising a cathode tab 10, an anode tab 10 and a separator isolated between the cathode tab 10 and the anode tab 10. Wherein the cathode tab 10 and / or the anode tab 10 is the tab 10 described in any one of the above embodiments.

[0072] It can be understood that by setting the structure of the cathode tab 10 and / or the anode tab 10 as the tab 10 described in any one of the above embodiments, the situation of the tab 10 being folded during the winding process of the cathode tab 10 and / or the anode tab 10 is prevented.

[0073] In addition, the separator is used to electrically isolate the cathode tab 10 and the anode tab 10, and can flow electrolyte. The separator can be but is not limited to a separator film, and the separator is a commonly used component in the art, which is not limited and described here.

[0074] The present application provides a monomer battery, comprising a shell and the electrode assembly contained in the shell. The monomer battery has the beneficial effects of the tab 10 described in any one of the above embodiments, which will not be described one by one here.

[0075] The application provides a battery, comprising the single battery in any one of the above embodiments.

[0076] The application provides an electric device, comprising the battery in any one of the above embodiments, wherein the battery is used for providing electric energy.

[0077] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as a limitation, and thus other examples of the example embodiments can have different values.

[0078] It should be noted that like reference numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it is not necessary to further define and explain it in the subsequent views.

[0079] The above described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application.

Claims

1. A single cell characterized by, Comprising: a pole piece (10); the pole piece (10) has a width direction (X), the pole piece (10) comprising: a body (100); at least one first tab (200) and at least one second tab (300), the first tab (200) and the second tab (300) are both connected to the same side of the body (100) along the width direction (X); the maximum dimension of the first tab (200) and the second tab (300) in the width direction (X) is the same, the pole piece (10) has a large face, in the direction perpendicular to the large face of the pole piece (10), the projection of the side of the first tab (200) away from the body (100) on the plane parallel to the large face of the pole piece (10) is arc-shaped, and the projection of the side of the second tab (300) away from the body (100) on the plane parallel to the large face of the pole piece (10) is straight line-shaped.

2. The cell according to claim 1, wherein The outer contour shape of the first tab (200) is semicircular, and the outer contour shape of the second tab (300) is trapezoidal, as viewed in the direction perpendicular to the large face of the pole piece (10).

3. The cell according to claim 1, wherein The pole piece has a length direction (Y) perpendicular to the width direction (X), the first tab (200) is one, and the second tab (300) is multiple, the multiple second tabs (300) are arranged at intervals, and the first tab (200) is arranged at one end of the multiple second tabs (300) along the length direction (Y).

4. The cell according to claim 3, wherein Along the length direction (Y), the width of the multiple second tabs (300) gradually decreases from both ends of the pole piece to the middle of the pole piece.

5. The cell according to claim 3, wherein Along the length direction (Y), the second tab (300) has two first side edges (310) arranged opposite to each other, and the second side edge (320) of the second tab (300) away from the body (100) is arranged between the two first side edges (310). The included angle between the first side edge (310) and the side of the body (100) along the width direction (X) is α, wherein α satisfies: 86°≤α≤145°.

6. The cell according to claim 5, wherein The side of the body (100) adjacent to the first side edge (310) is provided with at least one first arc segment (330), and the convex surface of the first arc segment (330) faces the other first side edge (310).

7. The cell according to claim 5, wherein The two ends of the second side edge (320) along the length direction (Y) are respectively provided with first bevels (340), one end of the first bevel (340) is connected with the second side edge (320), and the other end of the first bevel (340) is connected with the first side edge (310).

8. The cell according to claim 6, wherein The two ends of the second side edge (320) along the length direction (Y) are respectively provided with second arc segments (350), one end of the second arc segment (350) is connected with the second side edge (320), and the other end of the second arc segment (350) is connected with the first side edge (310).

9. The cell according to claim 8, wherein The arc length of the first arc segment (330) ranges from 1 to 20 mm, and / or the arc length of the second arc segment (350) ranges from 1 to 20 mm.

10. A battery, characterized by The single battery as claimed in any one of claims 1 to 9.

11. An electrical device, characterized by The single battery as claimed in claim 10.

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