Cylindrical battery

Abstract

This invention relates to the field of battery technology and proposes a cylindrical battery, comprising: a single-cell battery casing structure; and a battery cell disposed within the single-cell battery casing structure. The battery cell includes a battery cell body, a first tab, and a second tab. The first tab and the second tab, which are spaced apart, extend from the same end of the battery cell body. The battery cell body has a winding center. The first tab and the second tab are arranged along the circumferential direction of the winding center, and along the radial direction of the winding center, the length of the first tab is greater than the length of the second tab. This allows the first tab and the second tab to have sufficient current carrying capacity while also maintaining a certain distance between them. This rational arrangement of the first tab and the second tab on the battery cell body increases the space utilization of the battery cell body, thereby improving the performance of the cylindrical battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cylindrical battery. Background Technology

[0002] In related technologies, cylindrical batteries may include tabs arranged at intervals. Due to the limitations of the tab structure, it is difficult to control the positional relationship between adjacent tabs, which may lead to unreasonable layout problems. Summary of the Invention

[0003] This invention provides a cylindrical battery to improve the performance of cylindrical batteries.

[0004] According to a first aspect of the present invention, a cylindrical battery is provided, comprising:

[0005] Single-cell battery casing structure;

[0006] A battery cell is disposed within a single battery casing structure. The battery cell includes a battery cell body, a first tab, and a second tab. The first tab and the second tab, which are spaced apart, extend from the same end of the battery cell body. The battery cell body has a winding center.

[0007] The first electrode and the second electrode are arranged along the circumferential direction of the winding center, and the length of the first electrode is greater than the length of the second electrode along the radial direction of the winding center.

[0008] The cylindrical battery of this invention includes a single-cell battery casing structure and a battery cell. The battery cell is disposed within the single-cell battery casing structure and includes a battery cell body, a first tab, and a second tab. By arranging the first tab and the second tab, which are spaced apart, along the circumferential direction of the winding center, and by ensuring that the length of the first tab is greater than the length of the second tab along the radial direction of the winding center, the first tab and the second tab can be provided with sufficient current carrying capacity while maintaining a certain distance between them. This allows the first tab and the second tab to be rationally arranged on the battery cell body, increasing the space utilization of the battery cell body and thereby improving the performance of the cylindrical battery. Attached Figure Description

[0009] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures.

[0010] in:

[0011] Figure 1This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0012] Figure 2 This is a schematic diagram of the structure of a battery cell according to an exemplary embodiment;

[0013] Figure 3 This is a schematic diagram of a partially unfolded structure of a battery core according to an exemplary embodiment;

[0014] Figure 4 This is a diagram illustrating the arrangement trend of the tab layers of a battery according to an exemplary embodiment.

[0015] The annotations in the attached figures are explained as follows:

[0016] 10. Single cell casing structure; 20. Cell; 21. Cell body; 211. Winding center; 22. First tab; 221. First single tab; 23. Second tab; 231. Second single tab; 24. Third tab; 25. Fourth tab; 30. Terminal structure. Detailed Implementation

[0017] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0018] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0019] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0020] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0021] One embodiment of the present invention provides a cylindrical battery, please refer to... Figures 1 to 3 The cylindrical battery includes: a single cell housing structure 10; and a cell 20 disposed within the single cell housing structure 10. The cell 20 includes a cell body 21, a first tab 22, and a second tab 23. The first tab 22 and the second tab 23, which are spaced apart, extend from the same end of the cell body 21. The cell body 21 forms a winding center 211. The first tab 22 and the second tab 23 are arranged along the circumferential direction of the winding center 211, and along the radial direction of the winding center 211, the length of the first tab 22 is greater than the length of the second tab 23.

[0022] An embodiment of the present invention provides a cylindrical battery comprising a single-cell battery housing structure 10 and a battery cell 20. The battery cell 20 is disposed within the single-cell battery housing structure 10 and includes a battery cell body 21, a first tab 22, and a second tab 23. By arranging the first tab 22 and the second tab 23, which are spaced apart, along the circumferential direction of the winding center 211, and by ensuring that the length of the first tab 22 is greater than the length of the second tab 23 along the radial direction of the winding center 211, the first tab 22 and the second tab 23 can be provided with sufficient current carrying capacity while maintaining a certain distance between them. This allows the first tab 22 and the second tab 23 to be rationally arranged on the battery cell body 21, increasing the space utilization of the battery cell body 21 and thereby improving the performance of the cylindrical battery.

[0023] It should be noted that a cylindrical battery comprises a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell refers to a unit formed by winding stacked portions, which include a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged. Both the first and second electrodes are coated with active material.

[0024] Cylindrical batteries can be wound batteries, which involve winding a first electrode, a second electrode with the opposite electrical charge, and a separator disposed between the first and second electrodes to obtain a wound cell. After forming the wound cell, a winding center 211 is formed in the middle of the cell body 21. The winding center 211 can be a circular hole. For example, when the first electrode and the second electrode are positive and negative electrodes, respectively, positive and negative electrode tabs can also be formed on the first and second electrodes, respectively.

[0025] The first tab 22 and the second tab 23 can be formed on the first electrode and the second electrode respectively, so that the first tab 22 and the second tab 23 form the positive tab and the negative tab respectively. Along the radial direction of the winding center 211, the length of the first tab 22 is greater than the length of the second tab 23. While ensuring that the first tab 22 has sufficient current carrying capacity, the insulation distance between the first tab 22 and the second tab 23 can be easily controlled. For example, the side of the first tab 22 away from the winding center 211 and the side of the second tab 23 away from the winding center 211 are on the same turn of the cell 20. At this time, the side of the first tab 22 closer to the winding center 211 will be closer to the winding center 211 than the side of the second tab 23 closer to the winding center 211. Therefore, the insulation distance between the first tab 22 and the second tab 23 can be increased to avoid the risk of insulation failure of the first tab 22 and the second tab 23.

[0026] The first tab 22 and the second tab 23 can be formed simultaneously on the first electrode or the second electrode. In this case, the first tab 22 and the second tab 23, which are spaced apart, can simultaneously form positive or negative tabs. Along the radial direction of the winding center 211, the length of the first tab 22 is greater than the length of the second tab 23, which allows the first tab 22 and the second tab 23 to be more reasonably arranged on the cell body 21, thereby increasing the current carrying capacity of the first tab 22 and the second tab 23.

[0027] The radial direction of the winding center 211 can include multiple directions. The length of the first tab 22 can be obtained along the first radial direction of the winding center 211, and the length of the second tab 23 can be obtained along the second radial direction of the winding center 211. Further, the length of the first tab 22 can be considered as the distance from the side of the first tab 22 closest to the winding center 211 to the side of the first tab 22 furthest from the winding center 211, and the length of the second tab 23 can be considered as the distance from the side of the second tab 23 closest to the winding center 211 to the side of the second tab 23 furthest from the winding center 211. The radial direction of the winding center 211 is expressed as the direction from the center of the winding center 211 toward the circumferential outer edge of the cell body 21.

[0028] In one embodiment, the length difference between the first tab 22 and the second tab 23 is 0.2mm-10mm, thereby allowing the first tab 22 and the second tab 23 to be reasonably arranged on the cell body 21, increasing the space utilization of the cell body 21, and reasonably controlling the insulation distance between the first tab 22 and the second tab 23, thereby improving the safe use performance of the battery.

[0029] The length difference between the first electrode tab 22 and the second electrode tab 23 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, or 10mm, etc.

[0030] In one embodiment, combined Figure 3 As shown, the first electrode tab 22 and the second electrode tab 23 can be formed on the first electrode plate and the second electrode plate, respectively. Figure 3 The structure shown is the structure after the first electrode and the second electrode are stacked. It can be seen that the first single electrode tab 221 of the first electrode tab 22 is led out first, while the second single electrode tab 231 of the second electrode tab 23 is led out later. Therefore, after the first electrode tab 22 and the second electrode tab 23 are formed by winding, the first electrode tab 22 can be made closer to the winding center 211. Thus, the length of the first electrode tab 22 is greater than the length of the second electrode tab 23 in the radial direction along the winding center 211.

[0031] In one embodiment, along the radial direction of the winding center 211, the first electrode 22 includes a plurality of first single-piece electrodes 221, and the second electrode 23 includes a plurality of second single-piece electrodes 231. The number of first single-piece electrodes 221 is greater than the number of second single-piece electrodes 231, thereby making the length of the first electrode 22 greater than the length of the second electrode 23, thereby increasing the current carrying capacity of the first electrode 22.

[0032] Multiple first single-piece electrodes 221 can be folded together to form a first electrode 22, and multiple second single-piece electrodes 231 can be folded together to form a second electrode 23. By making the number of first single-piece electrodes 221 greater than the number of second single-piece electrodes 231, it can be ensured that the length of the first electrode 22 is greater than the length of the second electrode 23 after the multiple first single-piece electrodes 221 and the multiple second single-piece electrodes 231 are folded together.

[0033] In one embodiment, along the radial direction of the winding center 211, the first electrode tab 22 includes a plurality of first single-piece electrode tabs 221, and the second electrode tab 23 includes a plurality of second single-piece electrode tabs 231. The density of the plurality of first single-piece electrode tabs 221 is greater than that of the plurality of second single-piece electrode tabs 231, and the length of the first electrode tab 22 is greater than that of the second electrode tab 23. Therefore, the first electrode tab 22 can have a higher connection strength than the second electrode tab 23, and the first electrode tab 22 has a stronger current carrying capacity and is less prone to problems such as cold solder joints, which can ensure the connection stability between the first electrode tab 22 and the electrode lead-out structure.

[0034] In one embodiment, along the radial direction of the winding center 211, the first electrode 22 includes a plurality of first single-piece electrodes 221, and the second electrode 23 includes a plurality of second single-piece electrodes 231. The number of first single-piece electrodes 221 is not greater than the number of second single-piece electrodes 231, and the density of the plurality of first single-piece electrodes 221 is less than the density of the plurality of second single-piece electrodes 231. This allows the length of the first electrode 22 to be greater than the length of the second electrode 23. By controlling the density of the plurality of first single-piece electrodes 221 and the plurality of second single-piece electrodes 231, even with inconsistent quantities, the length of the first electrode 22 can still be greater than the length of the second electrode 23. This can, to some extent, avoid the problem of an excessive number of first single-piece electrodes 221, which would lead to an excessively heavy battery cell 20.

[0035] In one embodiment, along the radial direction of the winding center 211, the first electrode tab 22 includes a plurality of first single-piece electrode tabs 221, and the second electrode tab 23 includes a plurality of second single-piece electrode tabs 231. At least one of the plurality of first single-piece electrode tabs 221 has a length greater than the length of the second single-piece electrode tab 231, thereby also making the length of the first electrode tab 22 greater than the length of the second electrode tab 23. That is, the longer first single-piece electrode tab 221 can move closer to the position of the winding center 211 when it is coiled up, so that the first single-piece electrode tab 221 can extend toward the position closer to the winding center 211, thereby increasing the length dimension of the first electrode tab 22 along the radial direction of the winding center 211.

[0036] The length of the first single electrode tab 221 is the length of the first single electrode tab 221 along its lead-out direction, and the length of the second single electrode tab 231 is the length of the second single electrode tab 231 along its lead-out direction. Multiple first single electrode tabs 221 need to be gathered together to form a first electrode tab 22, and correspondingly, multiple second single electrode tabs 231 need to be gathered together to form a second electrode tab 23.

[0037] The lead-out direction of the first single-piece electrode 221 can be considered as the extension direction of the first single-piece electrode 221 after it is straightened. Correspondingly, the lead-out direction of the second single-piece electrode 231 can be considered as the extension direction of the second single-piece electrode 231 after it is straightened. The extension directions of the first single-piece electrode 221 and the second single-piece electrode 231 are both parallel to the axial direction of the winding center 211.

[0038] It should be noted that, along the radial direction of the winding center 211, the length of the first electrode tab 22 is greater than the length of the second electrode tab 23. The lengths of the first electrode tab 22 and the second electrode tab 23 can be controlled by controlling the tightness between the individual electrode tabs, or by controlling the number of individual electrode tabs, or by controlling the length of the individual electrode tab along its lead-out direction.

[0039] The tightness between individual tabs can be considered as the clamping force formed between two adjacent individual tabs. When the clamping force between two adjacent individual tabs is relatively small, the tightness is small, and when the clamping force between two adjacent individual tabs is relatively large, the tightness is large. For example, when three first individual tabs 221 form a first tab 22 and three second individual tabs 231 form a second tab 23, the clamping force between the three first individual tabs 221 is relatively small, while the clamping force between the three second individual tabs 231 is relatively large. Therefore, the tightness between the three first individual tabs 221 is less than the tightness between the three second individual tabs 231. As a result, the length of the first tab 22 is greater than the length of the second tab 23 in the radial direction along the winding center 211.

[0040] For example, when a first electrode 22 is formed by three first single-piece electrodes 221 and a second electrode 23 is formed by three second single-piece electrodes 231, the length of the three first single-piece electrodes 221 along their lead-out direction is greater than the length of the three second single-piece electrodes 231 along their lead-out direction. At this time, when the three first single-piece electrodes 221 are gathered together, the three first single-piece electrodes 221 can extend as a whole toward the winding center 211. Correspondingly, the three second single-piece electrodes 231 can also extend as a whole toward the winding center 211. However, since the length of the first single-piece electrodes 221 along their lead-out direction is greater than the length of the second single-piece electrodes 231 along their lead-out direction, the extension length of the three first single-piece electrodes 221 toward the winding center 211 is greater than the extension length of the three second single-piece electrodes 231 toward the winding center 211. Therefore, the length of the first electrode 22 is greater than the length of the second electrode 23 in the radial direction along the winding center 211.

[0041] In some embodiments, it is not excluded that the thickness of the first single-piece tab 221 may be greater than the thickness of the second single-piece tab 231. Therefore, even if the number of the first single-piece tab 221 and the number of the second single-piece tab 231 are the same, the tightness of the first single-piece tab 221 and the tightness of the second single-piece tab 231 are the same, and the length of the first single-piece tab 221 and the length of the second single-piece tab 231 are the same, it can still be guaranteed that the length of the first single-piece tab 22 is greater than the length of the second single-piece tab 23 along the radial direction of the winding center 211.

[0042] In one embodiment, the first electrode 22 and the second electrode 23 have the same polarity, that is, the first electrode 22 and the second electrode 23 can simultaneously form a positive electrode or a negative electrode.

[0043] In one embodiment, the first electrode 22 and the second electrode 23 have opposite polarities, that is, one of the first electrode 22 and the second electrode 23 forms a positive electrode and the other forms a negative electrode.

[0044] In one embodiment, the first tab 22 forms part of the positive tab. Along the winding direction of the cell body 21, the positive tab includes a plurality of spaced positive tab layers, and the distance between adjacent positive tab layers gradually increases, then gradually decreases, and finally gradually increases again. The tab layer includes one or more positive monolithic tabs, thereby forming a relatively long first tab 22 on the cell body 21.

[0045] Along the winding direction of the battery cell body 21, the positive electrode tab includes multiple spaced positive electrode tab layers. That is, each turn of the positive electrode tab can include one or at least two positive electrode tab layers. For example, when the positive electrode tab includes only a long first tab 22, one positive electrode tab layer can be provided on one turn near the winding center 211. During this process, as the radius of each turn gradually increases, the distance between adjacent positive electrode tab layers gradually increases. After winding to a certain number of turns, multiple spaced positive electrode tab layers can be provided on one turn. During this process, from having one positive electrode tab layer on one turn to having multiple positive electrode tab layers, although the radius of the corresponding turn increases, the distance between adjacent positive electrode tab layers will decrease. However, as the radius of each subsequent turn gradually increases, the distance between adjacent positive electrode tab layers will gradually increase again. In this process, a long first tab 22 can be formed, and a short tab can also be formed.

[0046] In one embodiment, the second tab 23 forms part of the negative tab. Along the winding direction of the cell body 21, the negative tab includes a plurality of spaced negative tab layers. The distance between adjacent negative tab layers gradually increases, then gradually decreases, and finally gradually increases again. The negative tab layer includes one or more negative monolithic tabs, thereby forming at least one shorter second tab 23 on the cell body 21.

[0047] Along the winding direction of the battery cell body 21, the negative electrode tab includes multiple spaced negative electrode tab layers. That is, each turn of the negative electrode tab can include one or at least two negative electrode tab layers. For example, when the negative electrode tab includes only a short second tab 23, then one negative electrode tab layer can be provided on one turn near the winding center 211. During this process, as the radius of each turn gradually increases, the distance between adjacent negative electrode tab layers gradually increases. After winding to a certain number of turns, multiple spaced negative electrode tab layers can be provided on one turn. During this process, from having one negative electrode tab layer on one turn to having multiple negative electrode tab layers, although the radius of the corresponding turn increases, the distance between adjacent negative electrode tab layers will decrease. However, as the radius of each subsequent turn gradually increases, the distance between adjacent negative electrode tab layers will eventually gradually increase again. During this process, a longer tab can be formed, and a relatively shorter second tab 23 can be formed.

[0048] In one embodiment, the first tab 22 forms part of the positive tab, the second tab 23 forms part of the negative tab, and the battery cell 20 is wound by a winding unit. Along the winding direction of the battery cell body 21, the winding unit includes multiple tab layers spaced apart. The distance between adjacent tab layers gradually increases, then gradually decreases, and finally gradually increases again. Each tab layer includes one or more monolithic tabs.

[0049] The winding unit may include a positive electrode sheet and a negative electrode sheet, which are stacked together. A diaphragm may be provided between the positive and negative electrode sheets. The winding unit includes multiple spaced tab layers, including a positive tab layer and a negative tab layer. Multiple spaced positive tab layers may be provided on the positive electrode sheet, and multiple spaced negative tab layers may be provided on the negative electrode sheet. After straightening the winding unit, it can be seen that the positive and negative tab layers are spaced apart and staggered. The overall trend of the distance between the positive and negative tab layers may be that it first gradually increases, then gradually decreases, and finally gradually increases again. Ultimately, a longer first tab 22, a shorter second tab 23, and other tabs can be formed on the cell body 21, which are not limited here.

[0050] It should be noted that, in combination Figure 4 As shown, Figure 4 This can be represented as an arrangement trend diagram of the positive electrode tab layers, where X represents the extension direction of multiple positive electrode tab layers, Y represents the distance between adjacent positive electrode tab layers, and S shows the changing trend of the distance between the positive electrode tab layers. Correspondingly, Figure 4 It can also be represented as an arrangement trend diagram of negative electrode tab layers, where X can represent the extension direction of multiple negative electrode tab layers, Y represents the distance between adjacent negative electrode tab layers, and S shows the changing trend of the distance between negative electrode tab layers.

[0051] Correspondingly, Figure 4 It can also be represented as an arrangement trend diagram of the tab layers of the winding unit, where X can represent the extension direction of multiple tab layers, Y represents the distance between adjacent tab layers, and S shows the changing trend of the distance between tab layers.

[0052] Figure 4 The reason it can be used to represent the changing trends of the three different distances mentioned above is that it is explained without considering the specific distance values; it is only used to show the trend of distance.

[0053] In one embodiment, such as Figure 2 As shown, there are two second tabs 23, and the first tab 22 is located between the two second tabs 23. On the basis of ensuring a reliable insulation distance between the second tabs 23 and the first tab 22, the current carrying capacity of the second tabs 23 can be guaranteed.

[0054] In one embodiment, such as Figure 2 As shown, the battery cell 20 also includes a third tab 24, which has the same polarity as the second tab 23. Along the radial direction of the winding center 211, the length of the third tab 24 is greater than the length of the second tab 23, which can further increase the current carrying capacity of the second tab 23 and the third tab 24 with the same polarity, and can improve the connection strength with the electrode lead-out structure.

[0055] In one embodiment, such as Figure 2 As shown, the battery cell 20 also includes two fourth tabs 25. The fourth tabs 25 have the same polarity as the first tab 22. The third tab 24 is located between the two fourth tabs 25. Along the radial direction of the winding center 211, the length of the fourth tab 25 is less than the length of the first tab 22. While ensuring that the first tab 22 and the fourth tab 25 have reliable current carrying capacity, it also ensures that the fourth tab 25 and the third tab 24 have reliable insulation capacity.

[0056] In one embodiment, the distances between the first tab 22, the second tab 23, the third tab 24, and the fourth tab 25 and the winding center 211 are all greater than 0. The first tab 22 and the fourth tab 25 have the same polarity, while the first tab 22 and the third tab 24 have the same polarity, and the first tab 22 and the second tab 23 have opposite polarities.

[0057] In one embodiment, the first tab 22 and the second tab 23 are arranged along the circumferential direction of the winding center 211. This not only simplifies the structure but also ensures that the first tab 22 and the second tab 23 have reliable current-carrying capacity while maintaining the insulation gap between them.

[0058] Combination Figure 2 As shown, the first electrode tab 22, the second electrode tab 23, the fourth electrode tab 25, the third electrode tab 24, the fourth electrode tab 25, and the second electrode tab 23 can be spaced apart along the circumferential direction of the winding center 211, so that the first electrode tab 22 and the two fourth electrode tabs 25 are used to form a positive electrode tab, while the two second electrode tabs 23 and the third electrode tab 24 can be used to form a negative electrode tab, or the first electrode tab 22 and the two fourth electrode tabs 25 are used to form a negative electrode tab, while the two second electrode tabs 23 and the third electrode tab 24 can be used to form a positive electrode tab.

[0059] In one embodiment, the end face area of ​​the first tab 22 away from the cell body 21 is larger than the end face area of ​​the second tab 23 away from the cell body 21, thereby allowing the first tab 22 to have a larger contact area with the electrode lead-out structure, thereby increasing the current carrying capacity between the first tab 22 and the electrode lead-out structure.

[0060] The end face area of ​​the first tab 22 away from the main body of the cell 21 is greater than that of the fourth tab 25 away from the main body of the cell 21, while the end face area of ​​the third tab 24 away from the main body of the cell 21 is greater than that of the second tab 23 away from the main body of the cell 21.

[0061] It should be noted that, with Figure 2 Taking the battery cell 20 as an example, the first tab 22 and two fourth tabs 25 are used to form the positive tab, while the two second tabs 23 and the third tab 24 can be used to form the negative tab. At this time, along the winding direction of the battery cell body 21, the positive tab includes multiple spaced-apart positive tab layers, and the distance between adjacent positive tab layers first gradually increases, then gradually decreases, and finally gradually increases again. Along the winding direction of the battery cell body 21, the negative tab includes multiple spaced-apart negative tab layers, and the distance between adjacent negative tab layers first gradually increases, then gradually decreases, and finally gradually increases again. Thus, after winding to form the battery cell 20, a structure like... Figure 2 The battery cell 20 is shown.

[0062] In one embodiment, such as Figure 1 As shown, the cylindrical battery also includes a terminal structure 30, which can be disposed on the single cell housing structure 10. The cell 20 can be electrically connected to the terminal structure 30. For example, the first tab 22 of the cell 20 can be electrically connected to the terminal structure 30, while the terminal structure 30 can be insulated from the single cell housing structure 10, and the second tab 23 of the cell 20 can be electrically connected to the single cell housing structure 10.

[0063] A cylindrical battery may include two terminal structures 30, and the first tab 22 and the second tab 23 of the cell 20 may be electrically connected to the two terminal structures 30 respectively.

[0064] In one embodiment, the single-cell battery casing structure 10 may include a cover plate and a casing component. The terminal post structure 30 may be disposed on the cover plate, and the casing component may have a receiving space, thereby achieving effective protection of the battery cell 20 after the cover plate and the casing component are connected. The cover plate and the casing component may be welded, or the cover plate and the casing component may be riveted.

[0065] An embodiment of the present invention also provides a battery pack including the cylindrical battery described above.

[0066] A cylindrical battery pack according to one embodiment of the present invention includes a single-cell battery housing structure 10 and a battery cell 20. The battery cell 20 is disposed within the single-cell battery housing structure 10. The battery cell 20 includes a battery cell body 21, a first tab 22, and a second tab 23. By arranging the first tab 22 and the second tab 23, which are spaced apart, along the circumferential direction of the winding center 211, and by arranging the first tab 22 longer than the second tab 23 along the radial direction of the winding center 211, the first tab 22 and the second tab 23 can be provided with sufficient current carrying capacity while maintaining a certain distance between them. This allows the first tab 22 and the second tab 23 to be rationally arranged on the battery cell body 21, increasing the space utilization of the battery cell body 21 and thereby improving the performance of the battery pack.

[0067] In one embodiment, the battery pack is a battery module or a battery pack.

[0068] The battery module includes multiple cylindrical batteries, and may also include a bracket on which the batteries can be fixed.

[0069] The battery pack includes multiple cylindrical batteries and a housing, which is used to hold the multiple cylindrical batteries in place.

[0070] It should be noted that the battery pack includes cylindrical batteries, and there can be multiple cylindrical batteries housed within the casing. Alternatively, the multiple cylindrical batteries can be assembled into a battery module and then installed within the casing. In other words, the multiple cylindrical batteries can be directly housed within the casing, eliminating the need for grouping them; the casing itself can be used to secure the multiple cylindrical batteries.

[0071] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0072] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, characterized in that, include: Single cell housing structure (10). The battery cell (20) is disposed within the single-cell battery casing structure (10). The battery cell (20) includes a battery cell body (21), a first tab (22), two second tabs (23), a third tab (24), and two fourth tabs (25). The first tab (22) and the second tabs (23) are spaced apart and extend from the same end of the battery cell body (21). The battery cell body (21) has a winding center (211). The first tab (22) is located between the two second tabs (23), and the third tab (24) is located between the two fourth tabs (25). The first tab (22) and the second tab (23) have opposite polarities. The third tab (24) has the same polarity as the second tab (23), and the fourth tab (25) has the same polarity as the first tab (22). The first electrode tab (22) and the second electrode tab (23) are arranged along the circumferential direction of the winding center (211), and along the radial direction of the winding center (211), the length of the first electrode tab (22) is greater than the length of the second electrode tab (23), the length of the third electrode tab (24) is greater than the length of the second electrode tab (23), and the length of the fourth electrode tab (25) is less than the length of the first electrode tab (22). Along the radial direction of the winding center (211), the first electrode tab (22) includes a plurality of first single-piece electrode tabs (221), and the second electrode tab (23) includes a plurality of second single-piece electrode tabs (231).

2. The cylindrical battery according to claim 1, characterized in that, The length difference between the first electrode tab (22) and the second electrode tab (23) is 0.2mm-10mm.

3. The cylindrical battery according to claim 1, characterized in that, The number of the first monolithic tabs (221) is greater than the number of the second monolithic tabs (231).

4. The cylindrical battery according to claim 1, characterized in that, The density of the plurality of first monolithic tabs (221) is greater than the density of the plurality of second monolithic tabs (231).

5. The cylindrical battery according to claim 1, characterized in that, The number of the first single-piece tabs (221) is not greater than the number of the second single-piece tabs (231), and the density of the multiple first single-piece tabs (221) is less than the density of the multiple second single-piece tabs (231).

6. The cylindrical battery according to claim 1, characterized in that, At least one of the first monolithic tabs (221) has a length greater than the length of the second monolithic tab (231); Wherein, the length of the first single electrode (221) is the length of the first single electrode (221) along its lead-out direction, and the length of the second single electrode (231) is the length of the second single electrode (231) along its lead-out direction.

7. The cylindrical battery according to claim 1, characterized in that, The first tab (22) forms part of the positive tab. Along the winding direction of the cell body (21), the positive tab includes multiple positive tab layers spaced apart. The distance between adjacent positive tab layers gradually increases, then gradually decreases, and finally gradually increases again. The tab layer includes one or more positive monolithic tabs.

8. The cylindrical battery according to claim 7, characterized in that, The second tab (23) forms part of the negative tab. Along the winding direction of the battery cell body (21), the negative tab includes multiple negative tab layers spaced apart. The distance between adjacent negative tab layers gradually increases, then gradually decreases, and finally gradually increases again. The negative tab layer includes one or more negative monolithic tabs.

9. The cylindrical battery according to claim 1, characterized in that, The first tab (22) forms part of the positive tab, and the second tab (23) forms part of the negative tab. The battery cell (20) is wound by a winding unit. Along the winding direction of the battery cell body (21), the winding unit includes multiple tab layers spaced apart. The distance between adjacent tab layers gradually increases, then gradually decreases, and finally gradually increases again. Each tab layer includes one or more single tabs.

10. The cylindrical battery according to any one of claims 1 to 9, characterized in that, The end face area of ​​the first tab (22) away from the cell body (21) is greater than the end face area of ​​the second tab (23) away from the cell body (21).

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