Battery and battery pack

Abstract

The present disclosure relates to a battery and a battery pack. The battery comprises a cylindrical jelly roll. The cylindrical jelly roll comprises electrode sheets, a separator, and tabs. A gap is formed between each two adjacent tabs. A distance h1 mm exists between each electrode sheet and the end of the gap close to the electrode sheet, and the distance between the side of the separator close to the tabs and the side of the electrode sheet provided with the tabs is h2 mm, where h1>h2. The battery of the present disclosure can prevent the separator and the electrode sheets from wrinkling, affecting the performance of the battery, and also ensures the structural strength of the tabs.

Description

A battery and battery pack

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202423003628.5, filed on December 6, 2024, entitled “A Battery and Battery Pack”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to a battery and battery pack. Background Technology

[0004] Currently, lithium-ion batteries can be classified into various types based on their shape, including cylindrical batteries, prismatic batteries, pouch batteries, and button batteries. Cylindrical batteries consist of a cylindrical casing and a core within the casing. The core is formed by winding a positive electrode plate, a negative electrode plate, and a separator between the positive and negative electrodes. The positive electrode plate has a positive tab extending outwards, and the negative electrode plate has a negative tab extending outwards. After the core is wound, the positive and negative tabs need to be folded to the end face of the core so that they can be connected to the positive and negative terminals of the cylindrical battery.

[0005] Because when the electrode tab is folded after the core is wound, the electrode sheet and diaphragm are prone to wrinkling, which also affects the overall structural strength of the electrode tab. Summary of the Invention

[0006] The primary objective of this disclosure is to provide a battery that avoids wrinkling of the separator and electrodes, which would affect battery performance, and also ensures the structural strength of the tabs.

[0007] Another objective of this disclosure is to provide a battery pack employing the aforementioned battery.

[0008] To address the aforementioned technical problems, this disclosure provides the following technical solutions:

[0009] A battery includes a cylindrical core, the cylindrical core including an electrode, a separator, and tabs, the electrode including a positive electrode and a negative electrode stacked together, the tab including a positive tab and a negative tab, the positive tab extending outward from the side of the positive electrode, the negative tab extending outward from the side of the negative electrode, and the separator being disposed between the positive electrode and the negative electrode;

[0010] When the cylindrical core is unfolded, the width direction of the electrode sheet is the first direction, the length direction of the electrode sheet is the second direction, and multiple tabs are spaced apart along the length direction on one side of the electrode sheet in the first direction. A gap is formed between two adjacent tabs. The gap extends along the first direction and is open at the end of the gap away from the electrode sheet. There is a distance h1mm between the end of the gap near the electrode sheet and the electrode sheet. The diaphragm extends beyond the electrode sheet along the first direction on the side near the tab. The distance between the side of the diaphragm near the tab and the side of the electrode sheet with the tab is h2mm, where h1>h2.

[0011] This disclosure also relates to a battery pack including the battery described above.

[0012] Compared with the prior art, the battery disclosed in this embodiment has the following advantages:

[0013] In this disclosure, during the manufacturing of the cylindrical core, the positive electrode sheet, separator, and negative electrode sheet are stacked together, with the separator located between the positive and negative electrode sheets. Then, the positive electrode sheet, separator, and negative electrode sheet are wound along a second direction to form the cylindrical core. After the electrode sheet and separator are wound, the tabs on the electrode sheet need to be folded onto the end face of the cylindrical core. Among the multiple tabs, the gap between two adjacent tabs can be used to position the folding position of the tab, allowing the tab to start folding in the area near the end of the electrode sheet. At the same time, since h1 > h2, the gap between two adjacent tabs is located in the area where the tab extends beyond the separator. Therefore, when the tab is folded, the separator will not be wrinkled, avoiding contact between the positive and negative electrode sheets and causing a short circuit. Furthermore, the separator material is relatively soft. If the separator wrinkles, it will cause uneven surface height, which will result in poor surface height consistency after the tab is folded, affecting subsequent welding and easily leading to poor welding. Attached Figure Description

[0014] Figure 1 is a schematic diagram of a cylindrical winding core according to an embodiment of the present disclosure;

[0015] Figure 2 is a schematic diagram of the unfolding of a cylindrical core according to an embodiment of the present disclosure;

[0016] Figure 3 is a schematic diagram of the unfolded positive electrode and separator according to an embodiment of the present disclosure;

[0017] Figure 4 is a schematic diagram of the unfolded negative electrode sheet and separator according to an embodiment of the present disclosure;

[0018] Figure 5 is a schematic diagram of the unfolding of a cylindrical core according to another embodiment of this disclosure.

[0019] In the figure, 100 is the cylindrical core; 101 is the core layer; 1 is the electrode sheet; 11 is the positive electrode sheet; 12 is the negative electrode sheet; 2 is the diaphragm; 3 is the tab; 31 is the positive tab; 32 is the negative tab; 33 is the first connecting part; 34 is the second connecting part; and 4 is the gap. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0025] In the description of this disclosure, it should be understood that the term "comprising" as used herein means the presence of the stated features, integers, steps, operations, parts, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, parts, components, and / or groups thereof. It should be understood that when we say a part is "connected" to another part, it can be directly connected to the other part, or there may be intermediate parts. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0026] As shown in Figures 1, 2, and 4, this disclosure relates to a battery, including a cylindrical core 100. The cylindrical core 100 includes an electrode 1, a separator 2, and tabs 3. The electrode 1 includes a positive electrode 11 and a negative electrode 12 stacked together. The tabs 3 include a positive tab 31 and a negative tab 32. The positive tab 31 extends outward from the side of the positive electrode 11, and the negative tab 32 extends outward from the side of the negative electrode 12. The separator 2 is disposed between the positive electrode 11 and the negative electrode 12.

[0027] When the cylindrical core 100 is unfolded, the width direction of the electrode 1 is the first direction (X direction), and the length direction of the electrode 1 is the second direction (Y direction). On one side of the electrode 1 in the first direction, a plurality of tabs 3 are spaced apart along the length direction. A gap 4 is formed between two adjacent tabs 3. The gap 4 extends along the first direction and is open at the end away from the electrode 1. There is a distance h1mm between the end of the gap 4 near the electrode 1 and the electrode 1. The diaphragm 2 extends beyond the electrode 1 along the first direction on the side near the tab 3. The distance between the side of the diaphragm 2 near the tab 3 and the side of the electrode 1 with the tab 3 is h2mm, where h1>h2.

[0028] Specifically, 0.5mm ≤ h1 ≤ 5mm, and the value of h1 can be 0.6mm, 0.7mm, 0.9mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, or 4.9mm. Therefore, h1 cannot be too small, as this would increase the risk of the diaphragm 2 folding and wrinkling. h1 also cannot be too large, as this would result in a smaller area for electrical connection after the tab 3 folds, leading to a weakened current-carrying capacity.

[0029] It should be noted that when the cylindrical core 100 is not unfolded, the axial direction of the cylindrical core 100 is the first direction.

[0030] In this disclosure, during the manufacturing of the cylindrical core 100, the positive electrode 11, the separator 2, and the negative electrode 12 are stacked together, with the separator 2 located between the positive electrode 11 and the negative electrode 12. Then, the positive electrode 11, the separator 2, and the negative electrode 12 are wound along a second direction to form the cylindrical core 100. After the electrode 1 and the separator 2 are wound, the tabs 3 on the electrode 1 need to be folded onto the end face of the cylindrical core 100. Among the multiple tabs 3, the gap 4 between two adjacent tabs 3 can be used to position the folding position of the tab 3, facilitating the tab 3 to be positioned within the gap. 4. The area near one end of the electrode 1 begins to fold. At the same time, since h1 > h2, the gap 4 between two adjacent tabs 3 is located in the area where the tabs 3 extend beyond the diaphragm 2. Therefore, when the tabs 3 fold, the diaphragm 2 will not be wrinkled, thus avoiding contact between the positive electrode 11 and the negative electrode 12 and causing a short circuit. Furthermore, the material of the diaphragm 2 is relatively soft. If the diaphragm 2 wrinkles, it will cause uneven surface height, which will result in poor surface height consistency after the tabs 3 are folded, affecting subsequent welding and easily leading to poor welding.

[0031] In some embodiments, the four sides of the diaphragm 2 extend outward beyond the four sides of the electrode 1, thereby allowing the diaphragm 2 to completely cover the electrode 1, thus preventing the positive electrode 11 and the negative electrode 12 from coming into contact and causing a short circuit.

[0032] In this embodiment, 1.05 ≤ h1 / h2 ≤ 1.8. The value of h1 / h2 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.75 or 1.78.

[0033] If h1 / h2 is too small, it indicates that the distance between the gap 4 between the tabs 3 and the electrode 1 is too small, or that the distance between the side of the diaphragm 2 adjacent to the tab 3 in the first direction and the side of the electrode 1 with the tab 3 is too large. Simultaneously, if the distance between the gap 4 between the tabs 3 and the electrode 1 is too small, the risk of the tabs 3 causing the diaphragm 2 to fold when the tabs 3 are folded increases, increasing the risk of the diaphragm 2 wrinkling. If h1 / h2 is too large, it indicates that the distance between the gap 4 between the tabs 3 and the electrode 1 is too large, or... The diaphragm 2 has a smaller dimension on the side of the electrode 1 adjacent to the tab 3 in the first direction than the side of the electrode 1 where the tab 3 is located. This results in a smaller area of ​​the tab 3 at the end face of the cylindrical core 100 after folding, leading to insufficient electrical connection area for the tab 3. In addition, the smaller dimension of the diaphragm 2 beyond the electrode 1 also increases the risk of contact and short circuit between the positive electrode 11 and the negative electrode 12. Therefore, maintaining 1.05≤h1 / h2≤1.8 is necessary to avoid short circuits in the battery and to prevent wrinkles in the diaphragm 2.

[0034] In this embodiment, in the first direction, the distance between the side of the tab 3 away from the electrode 1 and the electrode 1 is H mm, where 0.1 ≤ (H-h1) / H ≤ 0.5, and 3 mm ≤ H ≤ 9 mm. The value of (H-h1) / H can be 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, or 0.49; the value of H can be 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, or 8.5.

[0035] The distance between the side of the tab 3 away from the electrode plate 1 and the electrode plate 1 is H, that is, the dimension of the tab 3 in the first direction is H. The distance between the end of the gap 4 near the electrode plate 1 and the electrode plate 1 is h1. Then H-h1 is the dimension of the gap 4 in the first direction. (H-h1) / H will not be too large. The dimension of the gap 4 in the first direction is smaller than the dimension of the tab 3 in the first direction, so that the root of the tab 3 near the electrode plate 1 is not provided with the gap 4. This can strengthen the structural strength of the root of the tab 3, so that when the tab 3 is folded, it is not easy to cause the root of the tab 3 to fold. Therefore, it will not cause the diaphragm 2 to fold, and will not cause the diaphragm 2 to wrinkle. At the same time, (H-h1) / H will not be too small, so that after the tab 3 is folded, the electrical connection area formed at the end of the cylindrical core 100 meets the welding requirements and ensures the stability of the electrical connection.

[0036] In this embodiment, the electrode tab 3 has a dimension of L mm in the second direction, where 2 ≤ L ≤ 9 and 0.15 ≤ h1 / L ≤ 0.9. The value of h1 / L can be 0.2, 0.22, 0.25, 0.27, 0.3, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.82, 0.85, 0.88, or 0.89. The value of L can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, or 8.5 mm.

[0037] When the cylindrical core 100 is unfolded, the dimension of the tab 3 in the second direction is L, that is, the connection length of the tab 3 and the electrode 1 is L. The weldable area and current carrying capacity of the tab 3 after folding are related not only to the dimension of the gap 4 in the first direction, but also to the dimension of the tab 3 in the second direction. If h1 / L is too large, h1 will be too large, or L will be too small, which will result in the tab 3 having a smaller weldable area after folding, which will not meet the current carrying capacity of the battery. If h1 / L is too small, h1 will be too small, or L will be too large, which will result in the tab 3 easily causing the separator 2 to fold and wrinkle after folding, which will also increase the risk of short circuit. Therefore, in order to ensure the stability and current carrying capacity of the battery, 0.15≤h1 / L≤0.9 should be maintained.

[0038] In this embodiment, the diameter of the cylindrical core 100 is D mm, where 0.002 ≤ h1 / D ≤ 0.16. The value of h1 / D can be 0.005, 0.008, 0.01, 0.015, 0.02, 0.025, 0.03, 0.04, 0.06, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.152, 0.155, 0.158, or 0.159.

[0039] Since the larger the diameter D of the cylindrical core 100 is, the more layers the surface electrode 1 is wound up, and the larger the required flow area is. In order to meet the flow capacity, the size of the gap 4 between the tabs 3 in the first direction cannot be too small, so it is necessary to keep 0.002≤h1 / D≤0.16.

[0040] In this embodiment, 0.5≤h1≤5 and / or 0.5≤h2≤4.

[0041] Maintaining a size of 0.5 ≤ h2 ≤ 4 ensures that the separator 2 is not too small beyond the electrode 1, reducing the risk of short circuits in the battery. Conversely, the separator 2 is also not too large beyond the electrode 1, reducing the risk of wrinkles. Since the gap 4 needs to be placed in the area not covered by the separator 2, the size of the separator 2 is not too large, preventing the tab 3 from being too large in the first direction, or the gap 4 from being too small in the first direction, which would affect subsequent welding and current carrying capacity. Simultaneously, maintaining a size of 0.5 ≤ h1 ≤ 5 is crucial. If h1 is too small, it increases the risk of the separator 2 folding and wrinkling. If h1 is too large, after the tab 3 folds, the area for electrical connection of the tab 3 will be smaller, resulting in weaker current carrying capacity.

[0042] As shown in Figure 3, in this embodiment, the positive electrode sheet 11 has a plurality of positive electrode tabs 31 spaced apart along its length on one side in the first direction. A gap 4 is provided between two adjacent positive electrode tabs 31. The distance between the end of the gap 4 closest to the positive electrode sheet 11 and the positive electrode sheet 11 is h3 mm, where 0.5 ≤ h3 ≤ 5. The value of h3 can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.5, 3.8, 4, 4.2, 4.5, 4.6, 4.8, or 4.9.

[0043] That is, by maintaining 0.5≤h3≤5, the positive electrode tab 31 is less likely to cause the diaphragm 2 to wrinkle after being folded, and it also has sufficient current carrying capacity.

[0044] As shown in Figure 4, in this embodiment, the negative electrode sheet 12 has a plurality of negative electrode tabs 32 spaced apart along its length on one side in the first direction. A gap 4 is provided between two adjacent negative electrode tabs 32. The distance between the end of the gap 4 closest to the negative electrode sheet 12 and the negative electrode sheet 12 is h4 mm, where 0.5 ≤ h4 ≤ 4. The value of h4 can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.5, 3.8, or 3.9.

[0045] That is, by maintaining 0.5≤h4≤4, the negative electrode tab 32 is less likely to cause the diaphragm 2 to wrinkle after being folded, and it also has sufficient current carrying capacity.

[0046] In this embodiment, the positive electrode 11 has a plurality of positive electrode tabs 31 spaced apart along its length on one side in the first direction, and a gap 4 is provided between two adjacent positive electrode tabs 31. The negative electrode 12 has a plurality of negative electrode tabs 32 spaced apart along its length on one side in the first direction, and a gap 4 is provided between two adjacent negative electrode tabs 32. The size of the gap 4 between the positive electrode tabs 31 in the first direction is b1 mm, and the size of the gap 4 between the negative electrode tabs 32 in the first direction is b2 mm, wherein -3 ≤ b1 - b2 ≤ 2. The values ​​of b1 - b2 can be -2.5, -2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, or 1.8.

[0047] Specifically, 3≤b1≤8, 3≤b2≤8, the value of b1 can be 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm and 7.5mm, and the value of b2 can be 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm and 7.5mm.

[0048] That is, by keeping -3≤b1-b2≤2, the difference between the gap 4 of the positive electrode 31 and the gap 4 of the negative electrode 32 is small, so as to control the slit size of the positive electrode 31 and the negative electrode 32. After the positive electrode 31 and the negative electrode 32 are folded, the weldable areas of the positive electrode 31 and the negative electrode 32 at the end face of the cylindrical core 100 are similar, so as to achieve a balance in the current carrying capacity of the positive electrode 31 and the negative electrode 32.

[0049] As shown in Figure 5, in some embodiments, the tab 3 is trapezoidal, and the two sides of the tab 3 in the first direction are respectively the first connecting part 33 and the second connecting part 34, and the size of the first connecting part 33 in the second direction is larger than the size of the second connecting part 34 in the second direction.

[0050] That is, the tab 3 is trapezoidal, and the first connecting part 33 of the tab 3 is connected to the electrode 1, which can increase the structural strength of the root of the tab 3 and make it less likely to cause the diaphragm 2 to wrinkle when the tab 3 is bent.

[0051] In this embodiment, the tab 3 is rectangular and the gap 4 is rectangular, which allows for better control of the size of the gap 4, and the tab 3 has good strength consistency in the lead-out direction.

[0052] In this embodiment, the cylindrical core 100 includes multiple core layers 101. Each core layer 101 includes the electrode sheet 1 and the diaphragm 2 stacked together. Each core layer 101 also includes a plurality of electrode tabs 3 arranged circumferentially. There is a gap 4 between two adjacent electrode tabs 3, and the distance between each gap 4 and the electrode sheet 1 is the same. This facilitates the folding of the electrode tabs 3 on the same core layer 101 and avoids the risk of increased wrinkling of the diaphragm 2 when folding locally.

[0053] In this embodiment, the battery further includes a housing, the cylindrical core 100 is disposed inside the housing, the end of the housing is provided with a terminal post, and the tab 3 is electrically connected to the terminal post or the housing.

[0054] After the tab 3 is folded to the end face of the cylindrical core 100, the tab 3 can be directly electrically connected to the pole post or indirectly electrically connected through the current collector. The tab 3 can also be directly electrically connected to the housing or indirectly electrically connected through the current collector. Specifically, the end of the housing is provided with two pole posts, and the positive tab 31 and the negative tab 32 are electrically connected to the two pole posts respectively. Alternatively, the end of the housing is provided with only one pole post, and one of the positive tab 31 and the negative tab 32 is electrically connected to the pole post, while the other is electrically connected to the housing.

[0055] This disclosure also relates to a battery pack including the battery.

[0056] The battery pack, by employing the aforementioned battery, ensures its performance and stability, and is highly practical.

[0057] The above description is only a preferred embodiment of this disclosure. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this disclosure, and these improvements and substitutions should also be considered within the scope of protection of this disclosure.

Claims

1. A battery, characterized in that, The device includes a cylindrical core, which includes an electrode sheet, a separator, and tabs. The electrode sheet includes a positive electrode sheet and a negative electrode sheet stacked together. The tabs include a positive tab and a negative tab. The positive tab extends outward from the side of the positive electrode sheet, and the negative tab extends outward from the side of the negative electrode sheet. The separator is provided between the positive electrode sheet and the negative electrode sheet. When the cylindrical core is unfolded, the width direction of the electrode sheet is the first direction, the length direction of the electrode sheet is the second direction, and multiple tabs are spaced apart along the length direction on one side of the electrode sheet in the first direction. A gap is formed between two adjacent tabs. The gap extends along the first direction and is open at the end of the gap away from the electrode sheet. There is a distance h1mm between the end of the gap near the electrode sheet and the electrode sheet. The diaphragm extends beyond the electrode sheet along the first direction on the side near the tab. The distance between the side of the diaphragm near the tab and the side of the electrode sheet with the tab is h2mm, where h1>h2.

2. The battery according to claim 1, characterized in that, 1.05≤h1 / h2≤1.

8.

3. The battery according to claim 1 or 2, characterized in that, In the first direction, the distance between the side of the tab away from the electrode and the electrode is H mm, where 0.1 ≤ (H-h1) / H ≤ 0.

5.

4. The battery according to claim 3, characterized in that, 3mm≤Hmm≤9mm.

5. The battery according to any one of claims 1-4, characterized in that, The size of the electrode tab in the second direction is L mm, where 0.15 ≤ h1 / L ≤ 0.

9.

6. The battery according to claim 5, characterized in that, 2mm≤Lmm≤9mm.

7. The battery according to any one of claims 1-6, characterized in that, 0.5mm≤h1mm≤5mm and / or 0.5mm≤h2mm≤4mm.

8. The battery according to any one of claims 1-7, characterized in that, The positive electrode sheet has a plurality of positive electrode tabs spaced apart along its length on one side in the first direction, and a gap is provided between two adjacent positive electrode tabs. The distance between the end of the gap near the positive electrode sheet and the positive electrode sheet is h3mm, wherein 0.5mm≤h3mm≤5mm.

9. The battery according to any one of claims 1-8, characterized in that, The negative electrode sheet has a plurality of negative electrode tabs spaced apart along its length on one side in the first direction, and a gap is provided between two adjacent negative electrode tabs. The distance between the end of the gap near the negative electrode sheet and the negative electrode sheet is h4mm, wherein 0.5mm≤h4mm≤4mm.

10. The battery according to any one of claims 1-9, characterized in that, The positive electrode sheet has a plurality of positive tabs spaced apart along its length on one side in the first direction, and a gap is provided between two adjacent positive tabs. The negative electrode sheet has a plurality of negative tabs spaced apart along its length on one side in the first direction, and a gap is provided between two adjacent negative tabs. The size of the gap between the positive tabs in the first direction is b1mm, and the size of the gap between the negative tabs in the first direction is b2mm, wherein -3≤b1-b2≤2.

11. The battery according to claim 10, characterized in that, 3mm≤b1mm≤8mm, and / or 3mm≤b2mm≤8mm.

12. The battery according to any one of claims 1-11, characterized in that, The electrode tab is trapezoidal, with a first connecting portion and a second connecting portion on both sides in the first direction, and the size of the first connecting portion in the second direction is larger than the size of the second connecting portion in the second direction.

13. The battery according to any one of claims 1-12, characterized in that, The tab is rectangular, and the slit is rectangular.

14. The battery according to any one of claims 1-13, characterized in that, The cylindrical core includes multiple core layers, each core layer including the electrode sheet and the diaphragm stacked together, and each core layer including a plurality of electrode tabs arranged circumferentially, with a gap between two adjacent electrode tabs, and each gap being equidistant from the electrode sheet.

15. The battery according to any one of claims 1-14, characterized in that, It also includes a housing, the cylindrical core is disposed inside the housing, the end of the housing is provided with a pole post, and the pole lug is electrically connected to the pole post or the housing.

16. A battery pack, characterized in that, Includes the battery as described in any one of claims 1-15.

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