Battery and battery manufacturing method

Abstract

The invention discloses a battery and a battery manufacturing method, the battery comprises: a battery cell, the battery cell comprises: a first pole piece having an arc structure; the first pole piece is of an arc structure, the second pole piece is of an arc structure, the first pole piece and the second pole piece are arranged in a stacked mode in the thickness direction of the first pole piece, and the projection of the first pole piece falls within the projection range of the second pole piece. The battery disclosed by the invention can be matched with the shape of the electronic equipment, so that the cruising ability of the electronic equipment is relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and a battery manufacturing method. Background Art

[0002] In the related art, a battery is a cup, a tank or other container or a part of a composite container with an electrolyte solution and a metal electrode to generate an electric current, and is a device that can convert chemical energy into electrical energy. Among them, the use of batteries is very wide, and batteries can be used in a variety of electronic devices, such as mobile phones, tablets, electronic watches, electronic rings and electronic bracelets.

[0003] In the prior art, the shape of the electronic ring is annular, while the shape of the battery is usually square, which can be a square or a rectangle. Since the square space in the electronic ring is limited, the volume of the battery placed in the electronic ring is very small, which will result in a low battery life of the electronic ring. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery that can adapt to the shape of an electronic device, thereby making the electronic device have a longer battery life.

[0005] The invention also provides a battery manufacturing method.

[0006] A battery according to a first aspect of the present invention comprises:

[0007] A battery cell, the battery cell comprising:

[0008] The first pole piece has an arc structure;

[0009] The second pole piece is in an arc structure. Along the thickness direction of the first pole piece, the first pole piece and the second pole piece are stacked, and the projection of the first pole piece falls within the projection range of the second pole piece.

[0010] The battery according to the embodiment of the present invention has at least the following beneficial effects: the first pole piece is in an arc structure, the second pole piece is in an arc structure, and after the first pole piece and the second pole piece are stacked, the structure of the battery cell formed by the first pole piece and the second pole piece is in an arc shape. The shape of the formed battery cell is an arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring. In this way, the battery is larger in size, which can make the electronic device have a longer battery life.

[0011] According to some embodiments of the battery of the present invention, the battery cell further includes a first pole lug and a second pole lug, the first pole lug is connected to the first pole sheet, the second pole lug is connected to the second pole sheet, and the first pole lug and the second pole lug are respectively located at two ends of the battery cell.

[0012] In the battery according to some embodiments of the present invention, the width of the first pole ear is A, 3mm≤A≤10mm, the width of the second pole ear is B, 4mm≤B≤11mm; and / or the diameter of the battery cell is 15mm-125mm.

[0013] In batteries according to some embodiments of the present invention, a width of the first electrode tab is smaller than a width of the second electrode tab.

[0014] According to some embodiments of the present invention, the battery further comprises a shell and a cover plate, both the shell and the cover plate are in arc structure, the first pole tab is electrically connected to the shell, and the second pole tab is insulated and connected to the cover plate.

[0015] In batteries according to some embodiments of the present invention, both the first pole tab and the second pole tab protrude from the battery cell along a height direction of the battery cell.

[0016] In batteries according to some embodiments of the present invention, along a height direction of the battery cell, the first pole lug protrudes from one side of the battery cell, and the second pole lug protrudes from the other side of the battery cell.

[0017] In a battery according to some embodiments of the present invention, the first pole lug is connected to the first pole piece, the second pole lug is connected to the second pole piece, the battery cell includes a first side and a second side opposite to each other, the first pole lug is connected to the first side, and the second pole lug is connected to the second side.

[0018] The battery manufacturing method according to the second aspect of the present invention comprises the following steps:

[0019] Die-cutting the first pole piece and the second pole piece respectively so that both the first pole piece and the second pole piece have arc structures;

[0020] The first pole piece and the second pole piece are stacked to form a battery core.

[0021] The battery manufacturing method according to the embodiment of the present invention has at least the following beneficial effects: by die-cutting the first pole piece and the second pole piece respectively, the first pole piece can be made into an arc shape, and the second pole piece can be made into an arc shape, and then the first pole piece and the second pole piece are stacked to form a battery cell. The shape of the formed battery cell is an arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring, so that the volume of the battery is larger, which can make the electronic device have a longer battery life.

[0022] The battery according to the third aspect of the present invention is manufactured by the battery manufacturing method described in the first aspect of the present invention.

[0023] The battery according to the embodiment of the present invention has at least the following beneficial effects: in the battery manufacturing method, after the first pole piece and the second pole piece are die-cut respectively, the shape of the first pole piece can be made into a circular arc shape, and the shape of the second pole piece can be made into a circular arc shape, and then the first pole piece and the second pole piece are stacked to form a battery cell. Among them, the shape of the formed battery cell is a circular arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring. In this way, the battery manufactured by the battery manufacturing method has a larger volume, which can make the electronic device have a longer battery life.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 A flowchart of a battery manufacturing method according to some embodiments of the present invention;

[0027] Figure 2 is a schematic diagram of a battery according to a first embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a battery according to a second embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of a battery according to a third embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of a battery according to a fourth embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of a battery according to a fifth embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of a battery according to a sixth embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of a battery according to a seventh embodiment of the present invention;

[0034] Fig. 9 is a schematic diagram of a battery according to an eighth embodiment of the present invention;

[0035] Fig.10 is a schematic diagram of a battery according to a ninth embodiment of the present invention;

[0036] Fig.11 is a schematic diagram of a battery according to a tenth embodiment of the present invention;

[0037] Fig.12is a schematic diagram of a battery according to an eleventh embodiment of the present invention;

[0038] Fig.13 is a schematic diagram of a battery according to a twelfth embodiment of the present invention;

[0039] Fig.14 is a schematic diagram of a battery according to a thirteenth embodiment of the present invention.

[0040] Reference numerals:

[0041] The battery cell 100 , the first side 110 , the second side 120 , the first pole piece 200 , the second pole piece 300 , the first pole tab 400 , the second pole tab 500 , the housing 600 , the cover plate 700 , and the pole 800 . DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0046] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] In the related art, a battery is a cup, a tank or other container or a part of a composite container with an electrolyte solution and a metal electrode to generate an electric current, and is a device that can convert chemical energy into electrical energy. Among them, the use of batteries is very wide, and batteries can be used in a variety of electronic devices, such as mobile phones, tablets, electronic watches, electronic rings and electronic bracelets.

[0048] In the prior art, the shape of the electronic ring is annular, while the shape of the battery is usually square, which can be a square or a rectangle. Since the square space in the electronic ring is limited, the volume of the battery placed in the electronic ring is very small, which will result in a low battery life of the electronic ring. To this end, the present application proposes a battery manufacturing method and a battery.

[0049] Please refer to Figure 1 In some embodiments, a battery manufacturing method comprises the following steps:

[0050] S100, die-cutting the first pole piece 200 and the second pole piece 300 respectively, so that the first pole piece 200 and the second pole piece 300 are both arc structures;

[0051] S200 , stacking the first pole piece 200 and the second pole piece 300 to form a battery cell 100 .

[0052] Specifically, by die-cutting the first pole piece 200 and the second pole piece 300 respectively, the shape of the first pole piece 200 can be made into an arc shape, and the shape of the second pole piece 300 can be made into an arc shape, and then the first pole piece 200 and the second pole piece 300 are stacked to form a battery cell 100. The battery cell 100 formed is in an arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring, so that the volume of the battery is larger, and the endurance of the electronic device can be longer. In the prior art, since the shape of the battery cell 100 is square, the space that the electronic ring can accommodate the battery cell 100 is small, so the endurance of the electronic ring is poor.

[0053] It should be noted that the first pole piece 200 includes a foil and an active material layer. When manufacturing the first pole piece 200, the shape of the foil is a long strip (rectangle), and after the active material layer is coated on the foil, the first pole piece 200 can be formed. The first pole piece 200 can be a positive pole piece, and the first pole piece 200 can also be a negative pole piece, which is mainly determined by the active material layer on the foil. After the first pole piece 200 is made, the rectangular first pole piece 200 can be cut into an arc structure by a die-cutting tool. The arc structure can also be called a horseshoe or a circular ring. Similarly, the second pole piece 300 includes a foil and an active material layer. When manufacturing the second pole piece 300, the shape of the foil is a long strip (rectangle), and after the active material layer is coated on the foil, the second pole piece 300 can be formed. The second pole piece 300 can be a positive pole piece, and the second pole piece 300 can also be a negative pole piece, which is mainly determined by the active material layer on the foil. After the second pole piece 300 is manufactured, the rectangular second pole piece 300 can be cut into an arc structure by a die cutting tool. The arc structure can also be called a horseshoe shape or a circular ring. After the first pole piece 200 and the second pole piece 300 are stacked, a battery cell 100 with an arc structure can be formed. The battery manufacturing method has the characteristics of simple steps.

[0054] In addition, it is further explained that, in addition to the die-cutting method of the first pole piece 200 and the second pole piece 300 respectively. Figure 13 to Figure 14 In some embodiments, the first pole piece 200 and the second pole piece 300 may be laminated and then hot pressed to form an arc structure. Compared with the hot pressing method, the die cutting method is simpler and has fewer steps, which can improve work efficiency and save manufacturing costs. In addition, the hot pressing method will also reduce the number of cycles of the battery cell 100, while the die cutting method can effectively avoid this problem.

[0055] In some embodiments, the battery is made by the battery manufacturing method in the above embodiment. Specifically, in the battery manufacturing method, by die-cutting the first pole piece 200 and the second pole piece 300 respectively, the shape of the first pole piece 200 can be made into an arc shape, and the shape of the second pole piece 300 can be made into an arc shape, and then the first pole piece 200 and the second pole piece 300 are stacked to form a battery cell 100. Among them, the shape of the formed battery cell 100 is an arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring. In this way, the battery made by the battery manufacturing method has a larger volume, which can make the electronic device have a stronger endurance.

[0056] Please refer to Figures 1 to 10In some embodiments, the battery includes: a battery cell 100. The battery includes a first pole piece 200 and a second pole piece 300. The first pole piece 200 has an arc structure. The second pole piece 300 has an arc structure. Along the thickness direction of the first pole piece 200, the first pole piece 200 and the second pole piece 300 are stacked, and the projection of the first pole piece 200 falls within the projection range of the second pole piece 300. The first pole piece 200 has an arc structure, and the second pole piece 300 has an arc structure. After the first pole piece 200 and the second pole piece 300 are stacked, the structure of the battery cell 100 formed by the first pole piece 200 and the second pole piece 300 is an arc shape. Among them, the shape of the formed battery cell 100 is an arc shape, which can be adapted to the shape of an electronic device, such as an electronic ring. In this way, the battery has a larger volume, which can make the electronic device have a stronger endurance.

[0057] The following is a description of the stacking arrangement of the first pole sheet 200 and the second pole sheet 300 along the thickness direction of the first pole sheet 200, and the projection of the first pole sheet 200 falls within the projection range of the second pole sheet 300. Specifically, the first pole sheet 200 is a positive pole sheet, the second pole sheet 300 is a negative pole sheet, and the width of the second pole sheet 300 is greater than the width of the first pole sheet 200, that is, the width of the negative pole sheet is greater than the width of the positive pole sheet, which can effectively avoid the problem of lithium plating in the battery.

[0058] For further information, please refer to Figure 3 , Figures 5 to 10In some embodiments, the battery cell 100 further includes a first pole ear 400 and a second pole ear 500, the first pole ear 400 is connected to the first pole piece 200, the second pole ear 500 is connected to the second pole piece 300, and the first pole ear 400 and the second pole ear 500 are respectively located at both ends of the battery cell 100. The first pole piece 200 can be a positive pole piece, and the first pole ear 400 can be a positive pole ear. The first pole piece 200 can be a negative pole piece, and the first pole ear 400 can be a negative pole ear. The second pole piece 300 can be a positive pole piece, and the second pole ear 500 can be a positive pole ear. The second pole piece 300 can be a negative pole piece, and the second pole ear 500 can be a negative pole ear. After the battery is placed in an electronic device, such as an electronic ring, the shape of the battery can be a semicircular ring, the diameter of the battery is greater than the diameter of a finger, and the first pole ear 400 and the second pole ear 500 are respectively located at both ends of the battery cell 100, it is convenient to layout other circuit components in the electronic device. For example, the circuit board is a flexible circuit board, the shape of the circuit board is an arc, one end of the circuit board is electrically connected to the first pole ear 400, and the other end of the circuit board is electrically connected to the second pole ear 500. Among them, the first pole ear 400 and the second pole ear 500 are respectively located at the two ends of the battery cell 100, and the size of the first pole ear 400 and the second pole ear 500 can also be equal to the size of the first pole sheet 200, thereby improving the charging efficiency of the battery cell 100. In addition, it is conceivable that the first pole ear 400 and the second pole ear 500 can also be located at the same end of the battery cell 100. When the length of the first pole ear 400 and the second pole ear 500 is too large, the first pole ear 400 and the second pole ear 500 can be bent respectively, for example, the first pole ear 400 and the second pole ear 500 are bent once or multiple times.

[0059] Please refer to Fig.11 and Fig.12 In some embodiments, in addition to the battery cell 100, the battery also includes a shell 600 and a cover plate 700. The shell 600 and the cover plate 700 are both arc structures, that is, the shell 600 and the cover plate 700 are horseshoe-shaped. The shell 600 has a storage cavity, the battery cell 100 is placed in the storage cavity, and the cover plate 700 and the shell 600 are welded. The first pole ear 400 of the battery cell 100 can be directly welded to the shell 600 to make the shell 600 charged. A pole 800 can be set on the cover plate 700, so as to be insulated and connected with the second pole ear 500, that is, the pole 800 and the cover plate 700 are insulated, and the pole 800 and the second pole ear 500 are electrically connected.

[0060] Further, in some embodiments, the width of the first pole tab 400 is A, 3mm≤A≤10mm, and the width of the second pole tab 500 is B, 4mm≤B≤11mm. Specifically, the width of the first pole tab 400 can be 3mm, 4mm, 5mm, 8mm, 9mm or 10mm, and the first pole tab 400 can be a positive pole tab. When the width of the first pole tab 400 is less than 3mm, due to the small width of the first pole tab 400, this will result in the first pole tab 400 having limited current carrying capacity, resulting in poor battery performance. When the width of the first pole tab 400 is greater than 10mm, this will result in excessive resistance of the first pole tab 400, which will cause the battery to age easily. The width of the second pole tab 500 may be 4 mm, 5 mm, 8 mm, 9 mm, 10 mm or 11 mm. The second pole tab 500 may be a negative pole tab. When the width of the second pole tab 500 is less than 4 mm, the second pole tab 500 has a limited current carrying capacity due to its small width, resulting in poor battery performance. When the width of the second pole tab 500 is greater than 11 mm, the resistance of the second pole tab 500 is too large, making the battery prone to aging.

[0061] Further, in some embodiments, the diameter of the battery cell 100 is 15 mm to 125 mm. The diameter of the battery cell 100 may be 15 mm, 20 mm, 40 mm, 50 mm, 90 mm, 100 mm or 125 mm. In addition, in some embodiments, the thickness of the battery cell 100 is 0.3 mm to 12 mm, which can ensure that the volume of the battery and the electronic device is compatible, so that the endurance of the electronic device is strong. In addition, the battery cell 100 includes a first pole piece 200 and a second pole piece 300, and the number of the first pole piece 200 and the second pole piece 300 may be 5 to 120.

[0062] Further, in some embodiments, the width of the first pole ear 400 is smaller than the width of the second pole ear 500. The first pole ear 400 may be a positive pole ear, and the first pole ear 400 may be a negative pole ear. The second pole ear 500 may be a positive pole ear, and the second pole ear 500 may be a negative pole ear. By setting the width of the first pole ear 400 to be smaller than the width of the second pole ear 500, it is convenient to distinguish which of the first pole ear 400 and the second pole ear 500 is the positive pole ear and the other is the negative pole ear. That is, after the battery is manufactured, when the battery is connected to an electronic device, the positive and negative electrodes of the battery can be distinguished by the inconsistency of the widths of the first pole ear 400 and the second pole ear 500, which can improve work efficiency.

[0063] Furthermore, the first pole tab 400 and the second pole tab 500 are respectively located at the two ends of the battery cell 100. On this basis, the first pole tab 400 and the second pole tab 500 have further configurations. For details, please refer to Fig. 9 and Fig.10 In some embodiments, the first pole tab 400 and the second pole tab 500 both protrude from the battery cell 100 along the height direction of the battery cell 100. The shape of the battery cell 100 is a horseshoe shape, and the length of the battery cell 100 refers to the distance between the two ends of the battery cell 100. The width of the battery cell 100 refers to the width of the first pole sheet 200 or the second pole sheet 300. The height of the battery cell 100 refers to the cumulative thickness of the first pole sheet 200 and the second pole sheet 300. That is, the sum of the thickness of all the first pole sheets 200 and all the second pole sheets 300. The height direction of the battery cell 100 can be the thickness direction of the first pole sheet 200. Among them, the first pole tab 400 and the second pole tab 500 both protrude from the battery cell 100 along the height direction of the battery cell 100, which can increase the contact area between the first pole tab 400 and the first pole sheet 200, and increase the contact area between the second pole tab 500 and the second pole sheet 300, thereby facilitating welding. In addition, after the first pole tab 400 and the second pole tab 500 protrude in the height direction of the battery cell 100, the first pole tab 400 will not extend the length of the first pole sheet 200 in disguised form, and the second pole tab 500 will not extend the length of the second pole sheet 300 in disguised form. That is, if the first pole tab 400 and the second pole tab 500 protrude relative to the end surface of the battery cell 100, the volume of the battery cell 100 will be too large, thereby reducing the energy density of the battery.

[0064] Furthermore, there are two ways for the first tab 400 and the second tab 500 to protrude from the battery cell 100 along the height direction of the battery cell 100. The first way is described below. Fig.10 In some embodiments, along the height direction of the battery cell 100, the first pole tab 400 protrudes from one side of the battery cell 100, and the second pole tab 500 protrudes from the other side of the battery cell 100. Specifically, the various configurations of the first pole tab 400 and the second pole tab 500 can make the battery more flexible, thereby adapting to different electronic devices and facilitating the layout of the electronic devices.

[0065] Further, the second method is introduced below, please refer to Fig. 9 In some embodiments, along the height direction of the battery cell 100, the first pole tab 400 and the second pole tab 500 both protrude relative to the same side of the battery cell 100. Specifically, the various configurations of the first pole tab 400 and the second pole tab 500 can make the battery more flexible, thereby adapting to different electronic devices and facilitating the layout of the electronic devices.

[0066] For further information, please refer to Figure 6In some embodiments, the first pole tab 400 is connected to the first pole piece 200, the second pole tab 500 is connected to the second pole piece 300, the battery cell 100 includes a first side 110 and a second side 120 opposite to each other, the first pole tab 400 is connected to the first side 110, and the second pole tab 500 is connected to the second side 120. Specifically, the first side 110 and the second side 120 of the battery cell 100 have the same area, and the first side 110 and the second side 120 are the surfaces with the largest area among all surfaces of the battery cell 100. When the first pole tab 400 is connected to the first side 110, and the second pole tab 500 is connected to the second side 120, one side of the battery can be made positive and the other side can be made negative, which can make the battery adapt to different electronic devices. In addition, the shape of the first pole tab 400 can be an arc shape, one end of the first pole tab 400 is connected to one end of the battery cell 100, and then the first pole tab 400 is connected to the arc surface of the battery cell 100 and extends to the other end of the battery cell 100. Similarly, the shape of the second pole ear 500 can be an arc shape, one end of the second pole ear 500 is connected to one end of the battery cell 100, and then the second pole ear 500 is connected to the arc surface of the battery cell 100 and extends to the other end of the battery cell 100. The above arrangement can reduce the occupation of the first pole ear 400 and the second pole ear 500 in the space of the battery, so that the battery has a higher energy density. Specifically, the length of the first pole ear 400 is relatively long. In order to avoid the length of the first pole ear 400 from increasing the volume of the battery too much, the first pole ear 400 needs to be bent or otherwise processed. After the first pole ear 400 is made into an arc shape and the first pole ear 400 is attached to the arc surface of the battery cell 100, the problem of low battery energy density caused by the excessive length of the first pole ear 400 can be effectively avoided. Similarly, the length of the second pole ear 500 is relatively long. In order to avoid the length of the second pole ear 500 from increasing the volume of the battery too much, the second pole ear 500 needs to be bent or otherwise processed. By making the second pole tab 500 into an arc shape and attaching the second pole tab 500 to the arc surface of the battery cell 100 , the problem of low battery energy density caused by the excessive length of the second pole tab 500 can be effectively avoided.

[0067] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: A battery cell, the battery cell comprising: The first pole piece has an arc structure; The second pole piece is in an arc structure. Along the thickness direction of the first pole piece, the first pole piece and the second pole piece are stacked, and the projection of the first pole piece falls within the projection range of the second pole piece.

2. The battery according to claim 1, characterized in that The battery cell further includes a first pole lug and a second pole lug, wherein the first pole lug is connected to the first pole sheet, and the second pole lug is connected to the second pole sheet, and the first pole lug and the second pole lug are respectively located at two ends of the battery cell.

3. The battery according to claim 2, characterized in that The width of the first pole ear is A, 3mm≤A≤10mm, the width of the second pole ear is B, 4mm≤B≤11mm; and / or the diameter of the battery cell is 15mm-125mm.

4. The battery according to claim 2, characterized in that The width of the first electrode tab is smaller than the width of the second electrode tab.

5. The battery according to claim 2, characterized in that The battery further comprises a shell and a cover plate, wherein the shell and the cover plate are both in an arc structure, the first pole tab is electrically connected to the shell, and the second pole tab is insulated and connected to the cover plate.

6. The battery according to claim 2, characterized in that The first pole tab and the second pole tab both protrude from the battery cell along a height direction of the battery cell.

7. The battery according to claim 6, characterized in that Along the height direction of the battery cell, the first pole tab protrudes from one side of the battery cell, and the second pole tab protrudes from the other side of the battery cell.

8. The battery according to claim 1, characterized in that The first pole tab is connected to the first pole piece, the second pole tab is connected to the second pole piece, the battery cell includes a first side and a second side opposite to each other, the first pole tab is connected to the first side, and the second pole tab is connected to the second side.

9. A battery manufacturing method, characterized in that: The following steps are involved: Die-cutting the first pole piece and the second pole piece respectively so that both the first pole piece and the second pole piece have arc structures; The first pole piece and the second pole piece are stacked to form a battery core.

10. A battery, characterized in that The battery is prepared by the battery manufacturing method according to claim 9.

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