Battery and battery pack

Abstract

Battery, characterized in that it comprises: a cylindrical jelly roll comprising an electrode, a separator, and a tab, the electrode comprising a positive electrode and a negative electrode stacked on top of each other, the tab comprising a positive tab and a negative tab, the positive electrode provided with the positive tab extending outwardly from a side edge of the positive electrode, wherein the negative electrode provided with the negative tab extends outwardly from a side edge of the negative electrode, and wherein the separator is provided between the positive electrode and the negative electrode; wherein, in a state where the cylindrical jelly roll is unfolded, the width direction of the electrode is a first direction, the length direction of the electrode is a second direction, and the electrode is provided with a plurality of tabs at intervals along the length direction on one side in the first direction, a gap is formed between two adjacent tabs extending along the first direction, the gap is provided to be open at an end remote from the electrode, a distance between the end of the gap near the electrode and the electrode is h1 mm, the side of the separator near the tab extends beyond the electrode in the first direction, the distance between the side of the separator near the tab and the side of the electrode provided with the tab is h2 mm, where h1 > h2.

Description

TECHNICAL AREA

[0001] The present utility model relates to the technical field of batteries, in particular to a battery and a battery pack. BACKGROUND

[0002] Existing lithium-ion batteries can be divided into different types according to their appearance, such as cylindrical batteries, prismatic batteries, pouch batteries, and button batteries. Of these batteries, the cylindrical battery includes a cylindrical case and a jelly roll provided inside the case. The jelly roll is formed by winding a positive electrode, a negative electrode, and a separator positioned between the positive electrode and the negative electrode. The positive electrode is provided with a positive tab extending outward, and the negative electrode is provided with a negative tab extending outward. After the jelly roll is wound, the positive and negative tabs need to be folded over onto the end surface of the jelly roll so that the positive and negative tabs can be connected to the anode and cathode of the cylindrical battery, respectively.

[0003] After winding the jelly roll, folding the tabs may easily cause wrinkles on the electrodes and separator, which may also compromise the overall structural strength of the tab. SUMMARY OF THE UTILITY MODEL

[0004] The main object of the present utility model is to provide a battery that can prevent wrinkling of the separator and electrodes, which impairs battery performance, and also can ensure the structural strength of the tabs.

[0005] A further object of the utility model is to provide a battery pack containing the above-mentioned battery.

[0006] To solve the above technical problem, one aspect of the present utility model provides the following technical solution: A battery including a cylindrical jelly roll including an electrode, a separator, and a tab, the electrode including a positive electrode and a negative electrode stacked on top of each other, the tab including a positive tab and a negative tab, the positive electrode provided with the positive tab extending outward from a side edge of the positive electrode, the negative electrode provided with the negative tab extending outward from a side edge of the negative electrode, and the separator being provided between the positive electrode and the negative electrode;wherein, in a state where the cylindrical jelly roll is unfolded, the width direction of the electrode is a first direction, the length direction of the electrode is a second direction, and the electrode is provided with a plurality of tabs at intervals along the length direction on one side in the first direction, a gap is formed between two adjacent tabs extending along the first direction, the gap is provided to be open at an end remote from the electrode, a distance between the end of the gap near the electrode and the electrode is h1 mm, the side of the separator near the tab extends beyond the electrode in the first direction, the distance between the side of the separator near the tab and the side of the electrode provided with the tab is h2 mm, where h1 > h2.;

[0007] Another aspect of the present utility model provides a battery pack including the battery as described above.

[0008] The technical solution of the present application has the following advantages: In the technical solution of the present utility model, during the production of the cylindrical jelly roll, the positive electrode, the separator, and the negative electrode are stacked on top of each other. The separator is positioned between the positive electrode and the negative electrode. Then, the positive electrode, the separator, and the negative electrode are wound in the second direction to form the cylindrical jelly roll. After the electrode and the separator are wound, the tabs on the electrode must be folded over onto the end surface of the cylindrical jelly roll. The gap between two adjacent tabs among the plurality of tabs can be used to determine the folding position of the tab, so that the folding of the tabs can be started in the area where the gap is close to one end of the electrode.Furthermore, since h1>h2, the gap between the two adjacent tabs is located in the area where the tabs extend beyond the separator. Therefore, when the tabs are folded over, no wrinkling occurs on the separator, preventing contact between the positive and negative electrodes and causing a short circuit. Furthermore, the material structure of the separator is relatively soft. If wrinkling occurs on the separator, uneven surface heights will result. This then leads to poor surface height uniformity after the tabs are folded over, which affects the subsequent welding and easily leads to poor welding. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a cylindrical jelly roll according to an embodiment of the present invention; Fig. 2 is a schematic illustration of unfolding a cylindrical jelly roll according to an embodiment of the present invention; Fig. 3 is a schematic diagram of unfolding a positive electrode and a separator according to an embodiment of the present invention; Fig. 4 is a schematic diagram of unfolding a negative electrode and a separator according to an embodiment of the present invention; and Fig. 5 is a schematic illustration of unfolding a cylindrical jelly roll according to another embodiment of the present invention.

[0009] In the figures: 100-Cylindrical jelly roll; 101-Jelly roll layer; 1-Electrode; 11-Positive electrode; 12-Negative electrode; 2-Separator; 3-Tab; 31-Positive tab; 32-Negative tab; 33-First connecting part; 34-Second connecting part; 4-Gap DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] A specific embodiment of the present utility model is described in more detail below in conjunction with the attached drawings and examples. The following examples serve to illustrate the utility model and are not intended to limit the scope of protection of the present utility model.

[0011] It should be noted that the term "include" used in the description of the utility model refers to the presence of the features, integers, steps, operations, parts / components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, components, and / or groups thereof. It should be noted that when the description describes a part / component as being "connected" to another part / component, it may be directly connected to other parts / components, or intermediate parts / components may be present. The term "and / or" used here includes all or any unit and all combinations of one or more related elements listed.

[0012] As in the Fig. 1 and Fig. As shown in Fig. 4, one embodiment of the present utility model provides a battery including a cylindrical jelly roll 100 including an electrode 1, a separator 2, and a tab 3. The electrode 1 includes a positive electrode 11 and a negative electrode 12 stacked on top of each other. The tab 3 includes a positive tab 31 and a negative tab 32. The positive electrode 11 is provided with the positive tab 31 extending outward from the side edge of the positive electrode 11, and the negative electrode 12 is provided with the negative tab 32 extending outward from the side edge of the negative electrode 12. The separator 2 is provided between the positive electrode 11 and the negative electrode 12.

[0013] In a state where the cylindrical jelly roll 100 is unfolded, the width direction of the electrode 1 is a first direction, and the longitudinal direction of the electrode 1 is a second direction. The electrode 1 is provided with a plurality of tabs 3 at intervals along the longitudinal direction on one side in the first direction. A gap 4 extending in the first direction is formed between two adjacent tabs 3. The gap 4 is open at an end remote from the electrode 1. A distance between the end of the gap 4 near the electrode 1 and the electrode 1 is h1 mm. The side of the separator 2 near the tab 3 extends beyond the electrode 1 in the first direction. The distance between the side of the separator 2 near the tab 3 and the side of the electrode 1 provided with the tab 3 is h2 mm, where h1>h2.

[0014] Specifically, 0.5 mm≤h1≤5 mm, and the value of h1 can be 0.6 mm, 0.7 mm, 0.9 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, or 4.9 mm. It is understood that h1 should not be too small, otherwise the risk of folding and wrinkling of the separator 2 will be increased. Furthermore, it is understood that h1 should not be too large, otherwise the area of ​​the tab 3 for electrical connection may become small after the tab 3 is folded, resulting in a reduced overcurrent capacity.

[0015] It should be noted that when the cylindrical jelly roll 100 is not unfolded, the axial direction of the cylindrical jelly roll 100 is the first direction.

[0016] According to one embodiment of the present invention, in the manufacture of the cylindrical jelly roll 100, the positive electrode 11, the separator 2, and the negative electrode 12 are stacked on top of one another, the separator is positioned between the positive electrode 11 and the negative electrode 12, and then the positive electrode 11, the separator 2, and the negative electrode 12 are wound in the second direction to form the cylindrical jelly roll 100. After winding the electrode 1 and the separator 2, the tabs 3 on the electrode 1 must be folded over onto the end surface of the cylindrical jelly roll 100. The gap 4 between two adjacent tabs among the plurality of tabs 3 can be used to determine the folding position of the tab 3, so that the folding of the tab 3 can be started in the area where the gap 4 is near one end of the electrode 1.Furthermore, since h1>h2, the gap 4 between the two adjacent tabs 3 is located in the area where the tabs 3 extend beyond the separator 2. Therefore, when the tabs 3 are folded over, the separator 2 does not wrinkle, thereby preventing the positive electrode 11 and the negative electrode 12 from contacting and causing a short circuit. In addition, the material structure of the separator 2 is relatively soft. If wrinkling occurs on the separator 2, uneven surface heights will occur. This then leads to poor surface height uniformity after the tabs 3 are folded over, which affects the subsequent welding and easily leads to poor welding.

[0017] In some embodiments of the present invention, the four sides of the separator 2 extend outward beyond the four sides of the electrode 1. This allows the separator 2 to completely cover the electrode 1, preventing the positive electrode 11 and the negative electrode 12 from contacting each other and causing a short circuit.

[0018] In the present 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.

[0019] If h1 / h2 is too small, it means that the distance between the gap 4 between the tabs 3 and the electrode 1 is too small, or the distance between the side of the separator 2 in the first direction and adjacent to the tab 3 and the side of the electrode 1 on which the tab 3 is provided is too large. In addition, if the distance between the gap 4 between the tabs 3 and the electrode 1 is too small, when the tabs 3 fold over, the risk of the tabs 3 causing the separator 2 to fold over increases, and the risk of wrinkles forming on the separator 2 also increases. If h1 / h2 is too large, it means that the distance between the gap 4 between the tabs 3 and the electrode 1 is too large, or the dimension of the side of the separator 2 in the first direction and adjacent to the tab 3 that extends beyond the side of the electrode 1 on which the tab 3 is provided is small.In this case, after the tab 3 is folded over, the area of ​​the tab 3 at the end surface of the cylindrical jelly roll 100 is smaller, and the area of ​​the tab 3 to be electrically connected is insufficient. Furthermore, the smaller dimension of the separator 2 extending beyond the electrode 1 also increases the risk of the positive electrode 11 and the negative electrode 12 contacting each other and causing a short circuit. Therefore, the ratio should be set to 1.05≤h1 / h2≤1.8 to prevent a battery short circuit and also prevent wrinkling of the separator 2.

[0020] In the present embodiment, the distance between the side of the tab 3 remote from the electrode 1 and the electrode 1 in the first direction is H mm, where 0.1≤(H-h1) / H≤0.5, 3 mm≤H≤9 mm. The value of (H-h1) / H may 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; and the value of H may be 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, or 8.5.

[0021] The distance between the side of the tab 3 far from the electrode 1 and the electrode 1 is H. That is, the dimension of the tab 3 in the first direction is H, and the distance between the end of the gap 4 near the electrode 1 and the electrode 1 is h1. Then, H-h1 is the dimension of the gap 4 in the first direction, and (H-h1) / H is not 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 the base of the tab 3 near the end of the electrode 1 is not provided with the gap 4, thereby enhancing the structural strength of the base of the tab 3. With this structure, when the tab 3 is folded, it is not easy to cause the base of the tab 3 to fold over, thus preventing the separator 2 from folding over and also preventing the separator 2 from wrinkling.In addition, (H-h1) / H is not too small, and the electrical connection area formed at the end of the cylindrical jelly roll 100 after the tab 3 is folded can meet the welding requirements, thus ensuring the stability of the electrical connection.

[0022] In the present embodiment, the dimension of the tab 3 in the second direction is L mm, where 2≤L≤9, 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.

[0023] In a state where the cylindrical jelly roll 100 is unfolded, the dimension of the tab 3 in the second direction is L. That is, the connection length of the connection between the tab 3 and the electrode 1 is L. The weldable area and the overcurrent capacity of the tab 3 after folding relate 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, that is, h1 is too large or L is too small, the dimension of the tab 3 available for welding after folding the tab 3 is small, and the overcurrent capacity of the battery cannot be met. If h1 / L is too small, that is, h1 is too small or L is too large, the tab 3 easily causes the separator 2 to fold over and form wrinkles after folding, and the risk of a short circuit is also increased.Therefore, to ensure the stability and overcurrent performance of the battery, the ratio is set to 0.15≤h1 / 1≤0.9.

[0024] In the present embodiment, the diameter of the cylindrical jelly roll is 100 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.

[0025] The larger the diameter D of the cylindrical jelly roll 100, the more layers of the electrode 1 are wound and the larger the required overcurrent area. To accommodate the overcurrent capacity, the dimension of the gap 4 between the tabs 3 in the first direction must not be too small, therefore, 0.002≤h1 / D≤0.16 must be set.

[0026] In the present embodiment, 0.5≤h1≤5 and / or 0.5≤h2≤4 is set.

[0027] When 0.5≤h2≤4 is set, the dimension of the separator 2 extending beyond the electrode 1 is not too small, thereby reducing the risk of a short circuit in the battery. And the dimension of the separator 2 extending beyond the electrode 1 is not too large, thereby reducing the risk of wrinkling of the separator 2. In addition, since the gap 4 must be set in the area not covered by the separator 2, the dimension of the separator 2 is not too large. This can prevent the dimension of the tab 3 in the first direction from being too large, or prevent the dimension of the gap 4 in the first direction from being too small, which affects the subsequent welding and overcurrent capacity. In addition, when setting 0.5≤h1≤5 h1 should not be too small, otherwise the risk of turning over and wrinkling of the separator 2 is increased.And h1 should not be too large, otherwise after the tab 3 is folded over, the area of ​​the tab 3 used for electrical connection will be small, resulting in lower overcurrent capacity.

[0028] As in Fig. 3, in the present embodiment, a plurality of positive tabs 31 are provided at intervals along the longitudinal direction on one side of the positive electrode 11 in the first direction. The gap 4 is provided between two adjacent positive tabs 31, and the distance between the end of the gap 4 near the positive electrode 11 and the positive electrode 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.

[0029] That is, when 0.5≤h3≤5 is set, the positive tab 31 is unlikely to cause wrinkling on the separator 2 after being turned over, and there is also sufficient overcurrent capacity.

[0030] As in Fig. 4, in the present embodiment, a plurality of negative tabs 32 are provided at intervals along the longitudinal direction on one side of the negative electrode 12 in the first direction. The gap 4 is provided between two adjacent negative tabs 32, and the distance between the end of the gap 4 near the negative electrode 12 and the negative electrode 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.

[0031] That is, when 0.5≤h4≤4 is set, the negative tab 32 is unlikely to cause wrinkling on the separator 2 after being turned over, and there is also sufficient overcurrent capacity.

[0032] In the present embodiment, the positive electrode 11 is provided with a plurality of positive tabs 31 at intervals along the longitudinal direction on one side in the first direction, and the gap 4 is provided between two adjacent positive tabs 31. The negative electrode 12 is provided with a plurality of negative tabs 32 at intervals along the longitudinal direction on one side in the first direction, and the gap 4 is provided between two adjacent negative tabs 32. The dimension of the gap 4 between the positive tabs 31 in the first direction is b1 mm, and the dimension of the gap 4 between the negative tabs 32 in the first direction is b2 mm, where -3≤b1b2≤2. The value of b1-b2 can be -2.5, -2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, or 1.8.

[0033] Specifically, when setting 3≤b1≤8, 3≤b2≤8, the value of b1 can be 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm and 7.5 mm, and the value of b2 can be 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm and 7.5 mm.

[0034] That is, by setting -3≤b1-b2≤2, the difference between the gap 4 of the positive tabs 31 and the gap 4 of the negative tabs 32 is small to control the spacing of the positive tabs 31 and the negative tabs 32. After the positive tabs 31 and the negative tabs 32 are folded over, the weldable area of ​​the positive tabs 31 and the negative tabs 32 on the end surface of the cylindrical jelly roll 100 is similar, whereby a balanced overcurrent capacity of the positive tabs 31 and the negative tabs 32 can be achieved.

[0035] As in Fig.As shown in Figure 5, in some embodiments, the tab 3 is trapezoidal. The two sides of the tab 3 in the first direction are each a first connecting part 33 and a second connecting part 34. The dimension of the first connecting part 33 in the second direction is larger than the dimension of the second connecting part 34 in the second direction.

[0036] That is, the tab 3 is trapezoidal, and the first connecting part 33 of the tab 3 is connected to the electrode 1. Thus, the structural strength of the base of the tab 3 can be increased. When the tab 3 is bent, it is unlikely to cause wrinkling of the separator 2.

[0037] In the present embodiment, the tab 3 is a rectangular tab 3, and the gap 4 is a rectangular gap 4. Thus, the dimension of the gap 4 can be better controlled, and the uniformity of the strength of the tab 3 in the exit direction is good.

[0038] In the present embodiment, the cylindrical jelly roll 100 comprises a plurality of jelly roll layers 101, and each of the jelly roll layers 101 includes the electrode 1 and the separator 2 stacked on top of each other. Each layer of the jelly roll layers 101 includes a plurality of the tabs 3 arranged at intervals along the circumferential direction. The gap 4 is provided between two adjacent tabs 3, and the distance between each gap 4 and the electrode 1 is equal. This facilitates the folding of the tabs 3 on the same jelly roll layer 101, thereby avoiding the risk of wrinkling of the separator 2 during local folding.

[0039] In the present embodiment, the battery also includes a housing in which the cylindrical jelly roll 100 is provided. The end of the housing is provided with an electrode. The tab 3 is electrically connected to the electrode or the housing.

[0040] After the tab 3 is folded onto the end surface of the cylindrical jelly roll 100, the tab 3 can be directly electrically connected to the electrode or indirectly electrically connected through a collector plate, and the tab 3 can be directly electrically connected to the housing or indirectly electrically connected through a collector plate. Specifically, two electrodes are provided at the end of the housing, and the positive tab 31 and the negative tab 32 are electrically connected to the two electrodes, respectively. Optionally, only one electrode is provided at the end of the housing, and one of the positive tab 31 and the negative tab 32 is electrically connected to the electrode, and the other is electrically connected to the housing.

[0041] An embodiment of the present utility model provides a battery pack including the battery described above.

[0042] The battery pack with the battery as described can ensure the performance and stability and also has high functionality.

[0043] It should be noted that the above-mentioned embodiments are only preferred embodiments of the present utility model. Other forms of changes or modifications can be made by a person skilled in the art based on the above description. The obvious changes or modifications derived therefrom still fall within the scope of protection of the present utility model.

Claims

[1] Battery, characterized by that it includes: a cylindrical jelly roll comprising an electrode, a separator, and a tab, the electrode comprising a positive electrode and a negative electrode stacked on top of each other, the tab comprising a positive tab and a negative tab, the positive electrode provided with the positive tab extending outwardly from a side edge of the positive electrode, wherein the negative electrode provided with the negative tab extends outwardly from a side edge of the negative electrode, and wherein the separator is provided between the positive electrode and the negative electrode; wherein, in a state where the cylindrical jelly roll is unfolded, the width direction of the electrode is a first direction, the length direction of the electrode is a second direction, and the electrode is provided with a plurality of tabs at intervals along the length direction on one side in the first direction, a gap is formed between two adjacent tabs extending along the first direction, the gap is provided to be open at an end remote from the electrode, a distance between the end of the gap near the electrode and the electrode is h1 mm, the side of the separator near the tab extends beyond the electrode in the first direction, the distance between the side of the separator near the tab and the side of the electrode provided with the tab is h2 mm, where h1 > h2. [2] Battery according to claim 1, characterized by that 1.05≤h1 / h2≤1.

8. [3] Battery according to one of the preceding claims, characterized by that the distance between the side of the tab remote from the electrode and the electrode in the first direction is H mm, where 0.1≤(H-h1) / H≤0.

5. [4] Battery according to one of the preceding claims, characterized by that the dimension of the tab in the second direction is L mm, where 0,15≤h1 / L≤0,9. [5] Battery according to one of the preceding claims, characterized by that 0.5≤h1≤5 and / or 0.5≤h2≤4. [6] Battery according to one of the preceding claims, characterized by that a plurality of positive tabs are provided at intervals along the longitudinal direction on one side of the positive electrode in the first direction, the gap is provided between two adjacent positive tabs, and the distance between the end of the gap near the positive electrode and the positive electrode is h3 mm, where 0.5≤h3≤5. [7] Battery according to one of the preceding claims, characterized by that a plurality of negative tabs are provided at intervals along the longitudinal direction on one side of the negative electrode in the first direction, the gap is provided between two adjacent negative tabs, and the distance between the end of the gap near the negative electrode and the negative electrode is h4 mm, where 0.5≤h4≤4. [8] Battery according to one of the preceding claims, characterized byin that the positive electrode is provided with a plurality of positive tabs at intervals along the longitudinal direction on one side in the first direction and a gap is provided between two adjacent positive tabs, the negative electrode is provided with a plurality of negative tabs at intervals along the longitudinal direction on one side in the first direction and the gap is provided between two adjacent negative tabs, the dimension of the gap between the positive tabs in the first direction is b1 mm and the dimension of the gap between the negative tabs in the first direction is b2 mm, where -3≤b1-b2≤2. [9] Battery according to one of the preceding claims, characterized bythat the tab is trapezoidal, the two sides of the tab in the first direction are a first connecting part and a second connecting part, respectively, wherein the dimension of the first connecting part in the second direction is greater than the dimension of the second connecting part in the second direction. [10] Battery according to one of the preceding claims, characterized by that the tab is a rectangular tab and the gap is a rectangular gap. [11] Battery according to one of the preceding claims, characterized by that the cylindrical jelly roll comprises a plurality of jelly roll layers, and each of the jelly roll layers comprises the electrode and the separator stacked on top of each other, wherein each layer of the jelly roll layers comprises a plurality of tabs arranged at intervals along the circumferential direction, wherein the gap is provided between two adjacent tabs, and the distance between each gap and the electrode is the same. [12] Battery according to one of the preceding claims, characterized by that it further comprises a housing in which the cylindrical jelly roll is provided, the end of the housing is provided with an electrode and the tab is electrically connected to the electrode or the housing. [13] Battery pack, characterized by that it comprises a battery according to one of claims 1 to 12.

Images