Cylindrical battery and battery pack

Abstract

A cylindrical battery comprising a housing (10) and a battery cell (20) arranged in the housing (10), the battery cell (20) comprising a first electrode tab and a second electrode tab, the first electrode tab and the second electrode tab both being on the same side of the battery cell (20), and the first electrode tab and the second electrode tab having opposite polarities;the housing (10) comprises a circumferential side wall (11), a first end wall (12) and a second end wall (13) located at both ends of the circumferential side wall (11), wherein a terminal arrangement (14) is arranged on the first end wall (12), a first output terminal is arranged on the housing (10) of the cylindrical battery and a second output terminal is arranged on the first end wall (12), wherein a first insulation layer (30) and a second insulation layer (40) are arranged on an outer peripheral surface of the battery cell (20), wherein the first insulation layer (30) is arranged close to the first end wall (12), wherein the second insulation layer (40) is located on a side of the first insulation layer (30) opposite the first end wall (12), and wherein a thermal deformation temperature of the first insulation layer (30) is higher than a thermal deformation temperature of the second insulation layer (40);

Description

Technical field

[0001] This application relates to the technical field of batteries and accumulators in the area of ​​new energies. In particular, this application relates to a cylindrical battery and a battery pack. background

[0002] A battery pack is an important component of new energy vehicles, which typically comprise multiple batteries or accumulators. The battery pack consists of a battery cell with electrode tabs welded to terminals on the end cap, connecting the battery cell to external power-consuming devices. To ensure the battery cell's insulation performance, an insulating film is wrapped around its outer surface.

[0003] During battery use, current flows through the terminal and electrode tab. Since both are made of metal, significant heat is generated in the area where the electrode tab and terminal connect. The insulating film near this area can melt due to the high temperatures, causing it to detach from the battery cell and impairing the battery's normal operation. Summary

[0004] The technical problem to be solved by the present application is therefore to overcome the disadvantage in the prior art in which the insulating film near the connection area of ​​the electrode tab and connection is easily affected by high temperatures during battery operation, and to provide a cylindrical battery and battery pack.

[0005] To solve the above problem, the present application provides a cylindrical battery comprising a housing and a battery cell arranged within the housing. The battery cell has a first electrode tab and a second electrode tab, both located on the same side of the battery cell, and the first and second electrode tabs have opposite polarities. The housing has a circumferential side wall and a first end wall and a second end wall located at both ends of the circumferential side wall. A terminal arrangement is located on the first end wall, a first output terminal is located on the housing of the cylindrical battery, a second output terminal is located on the first end wall, and a first insulating layer and a second insulating layer are arranged on an outer circumferential surface of the battery cell.The first insulation layer is located near the first end wall, the second insulation layer is located on one side of the first insulation layer opposite the first end wall, and the thermal deformation temperature of the first insulation layer is higher than that of the second insulation layer.

[0006] Optionally, the heat deformation temperature of the first insulation layer is in a range of 220°C to 280°C and / or the heat deformation temperature of the second insulation layer is in a range of 100°C to 150°C.

[0007] Optionally, the housing serves as the first output connection, the connection arrangement serves as the second output connection, and the first electrode tab and the second electrode tab are electrically connected to the housing or the connection arrangement.

[0008] Optionally, along an axial direction of the battery cell, there is a distance between an edge of the first insulation layer facing the first end wall and the first end wall in a range of 0 to 4 mm.

[0009] Optionally, along the axial direction of the battery cell, one dimension of the first insulation layer is smaller than one dimension of the second insulation layer.

[0010] Optionally, the ratio of the dimension of the first insulation layer to the dimension of the second insulation layer along the axial direction of the battery cell is in a range of 0.04 to 0.21.

[0011] If the radius of the cylindrical battery is greater than or equal to 40 mm, the ratio of the dimension of the first insulation layer to the dimension of the second insulation layer may optionally be in a range of 0.06 to 0.18.

[0012] Optionally, the dimension of the first insulation layer along the axial direction of the battery cell is in a range of 8 mm to 18 mm.

[0013] Optionally, the first insulation layer and the second insulation layer have an overlapping section, and along the axial direction of the battery cell, one dimension of the overlapping section lies in a range of 0 to 4 mm.

[0014] Optionally, if the ratio of an area of ​​an end surface of the first electrode tab to an area of ​​an end surface of the second electrode tab is in a range of 0.5 to 1, the distance between an edge of the overlapping section near the first end wall and the first end wall is in a range of 10 mm to 18 mm.

[0015] Optionally, the ratio of the thickness of the first insulation layer to the thickness of the second insulation layer may be in the range of 0.6 to 1.2.

[0016] The present application also provides a battery pack comprising the cylindrical battery described above.

[0017] This application offers the following advantages: Using the technical solution of the present application, a first insulating layer and a second insulating layer are arranged on the outer circumferential surface of the battery cell, the first insulating layer being located near the terminal arrangement. During use of the cylindrical battery, the terminal arrangement generates a large amount of heat, while the first insulating layer has a higher thermal deformation temperature, enabling it to withstand the high temperature at the connection point and preventing the first insulating layer from detaching from the battery cell due to melting at high temperature.The second insulating layer is less affected by high temperatures; therefore, the thermal deformation temperature of the second insulating layer is set relatively lower to ensure good heat dissipation, thus preventing excessive heat buildup on the battery cell surface. Therefore, the technical solution of the present application overcomes the disadvantage in the prior art where the insulating film near the connection area of ​​the electrode tab and terminal is easily affected by high temperatures during battery operation. Brief description of the drawings

[0018] To better illustrate the technical solutions in the specific embodiments or in the prior art of the present application, a brief introduction to the drawings used in describing the specific embodiments or the prior art is given. It is understood that the drawings described below illustrate some embodiments of the present application. Those skilled in the art can derive other drawings from these without any creative effort. Fig. Figure 1 shows a structural representation of the cylindrical battery of the present application; Fig. 2 shows a structural representation of the in Fig. 1 shown first end wall and battery cell of the cylindrical battery; Fig. Figure 3 shows a front view of the in Fig. 2 shown first end wall and battery cell; Fig. Figure 4 shows a representation of the overlapping section between the first insulation layer and the second insulation layer of the in Fig. 2 battery cells shown. Reference figures:

[0019] 10 - Housing; 20 - Battery cell; 11 - Circumferential side wall; 12 - First end wall; 13 - Second end wall; 14 - Terminal arrangement; 30 - First insulation layer; 40 - Second insulation layer; 50 - Overlapping section. Detailed description

[0020] The technical solutions of the present application are now clearly and completely described with reference to the drawings. The described embodiments are, of course, only a part of the embodiments of the present application and not all embodiments. All other embodiments that are obtained by those skilled in the art based on the embodiments of the present application without any inventive effort fall within the scope of protection of the present application.

[0021] It should be noted that in the description of the present application, terms such as "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", and "outside", which indicate an orientation or positional relationship, are based on the orientation and positional relationships shown in the drawings and serve only for the convenience of description and simplification. They neither specify nor imply a particular orientation of the device or element in question, nor that it must be designed and operated in a particular orientation, and therefore cannot be understood as limitations of the present application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting a relative meaning.

[0022] In the description of the present application, it should be noted that the terms "installed," "connected," and "coupled" are to be understood in a broad sense unless expressly stated otherwise and limited. For example, they may refer to a fixed connection, detachable connection, or integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via intermediate media; or internal communication between two elements. Those skilled in the art may understand the specific meanings of these terms in the present application according to the respective situations.

[0023] Furthermore, the technical features involved in the various embodiments of the present application described below can be combined with each other, as long as they do not contradict each other.

[0024] As in the Fig. As shown in Figures 1 to 3, the cylindrical battery according to one embodiment of the cylindrical battery of the present application comprises a housing 10 and a battery cell 20 arranged in the housing 10. The battery cell 20 has a first electrode tab and a second electrode tab, both located on the same side of the battery cell 20, and the first electrode tab and the second electrode tab have opposite polarities. The housing 10 has a circumferential side wall 11, a first end wall 12, and a second end wall 13, located at both ends of the circumferential side wall 11, with a terminal arrangement 14 being arranged at the first end wall 12. A first output terminal is arranged on the housing 10 of the cylindrical battery, and a second output terminal is arranged at the first end wall 12.

[0025] Furthermore, a first insulation layer 30 and a second insulation layer 40 are arranged on the outer circumferential surface of the battery cell 20. The first insulation layer 30 is located near the first end wall 12, the second insulation layer 40 is located on one side of the first insulation layer 30 opposite the first end wall 12, and the thermal deformation temperature of the first insulation layer 30 is higher than that of the second insulation layer 40.

[0026] Using the technical solution of this embodiment, a first insulating layer 30 and a second insulating layer 40 are arranged on the outer circumferential surface of the battery cell 20, the first insulating layer 30 being located near the terminal arrangement 14. During use of the cylindrical battery, the terminal arrangement 14 generates a large amount of heat, while the first insulating layer 30 has a higher thermal deformation temperature, enabling it to withstand the high temperature at the connection point and preventing the first insulating layer 30 from detaching from the battery cell 20 due to melting at high temperature.The second insulating layer 40 is comparatively less affected by high temperatures; therefore, the thermal deformation temperature of the second insulating layer 40 is comparatively lower, ensuring good heat dissipation and preventing excessive heat buildup on the surface of the battery cell 20. Thus, the technical solution of this embodiment overcomes the disadvantage of the prior art, where the insulating film near the connection area of ​​the electrode tab and terminal is easily affected by high temperatures during battery operation.

[0027] It should be noted that of the first and second electrode tabs, one is a positive electrode tab and the other is a negative electrode tab.

[0028] Furthermore, in this embodiment, the test method for the high temperature resistance of the first insulation layer 30 and the second insulation layer 40 refers to the national standard GB / T1634-2004 - Test methods for heat deflection temperature and heat resistance of plastics.

[0029] As in Fig. As shown in Figure 1, the cylindrical battery has an overall cylindrical structure, and the casing 10 of the cylindrical battery has a circumferential side wall 11, a first end wall 12, and a second end wall 13. The circumferential side wall 11 has a cylindrical structure, and the second end wall 13 is connected to the end of the circumferential side wall 11. They can be integrally formed or joined by welding, adhesive bonding, or fasteners. The circumferential side wall 11 and the second end wall 13 form an open-end structure.

[0030] From the Fig. 1 and Fig. Figure 2 shows that a connection arrangement 14 is located on the first end wall 12. During assembly, the first electrode tab and / or the second electrode tab of the battery cell 20 are first connected to the connection arrangement 14, i.e., the first end wall 12 is connected to the battery cell 20. Then, the battery cell 20 is placed in the space enclosed by the circumferential side wall 11 and the second end wall 13. At this point, the first end wall 12 covers the opening of the circumferential side wall 11, and finally, the first end wall 12 is welded to the circumferential side wall 11.

[0031] Furthermore, an insulating layer covers the battery cell 20 to isolate it from other structures. The insulating layer can be an insulating film that is attached circumferentially to the outer surface of the battery cell 20.

[0032] Furthermore, in order to reduce the effects of heat development at the connection arrangement 14 on the insulation layer, the insulation layer in this embodiment is divided into a first insulation layer 30 and a second insulation layer 40.

[0033] In particular, they cover, as can be seen from Fig. 2 and Fig. As can be seen in Figure 3, both the first insulating layer 30 and the second insulating layer 40 insulate the battery cell 20 around its circumference. The first insulating layer 30 and the second insulating layer 40 are distributed along the axial direction of the battery cell 20, with the first insulating layer 30 being located near the first end wall 12, i.e., near the junction. The thermal deformation temperature of the first insulating layer 30 is higher than that of the second insulating layer 40, and along the axial direction of the battery cell 20, the height of the first insulating layer 30 is less than that of the second insulating layer 40.

[0034] In this embodiment, the first insulating layer 30 is located near the terminal assembly 14 and has a higher thermal deformation temperature. Therefore, the heat generated by the terminal assembly 14 during operation of the cylindrical battery has only a minor effect on the first insulating layer 30. The first insulating layer 30 can withstand higher temperatures, thus preventing it from detaching from the battery cell 20 due to melting at high temperature.

[0035] Furthermore, due to the higher thermal deformation temperature of the first insulation layer 30, its heat dissipation capacity is correspondingly reduced. To ensure the overall heat dissipation capacity of the battery cell 20, the thermal deformation temperature of the second insulation layer 40 is set to be slightly lower than that of the first insulation layer 30. Since the second insulation layer 40 is located further away from the terminal assembly 14, the heat generated by the terminal assembly 14 has only a minor effect on the second insulation layer 40 and does not cause it to melt. Moreover, the second insulation layer 40 has a lower thermal deformation temperature and good heat dissipation capacity, thus ensuring the overall heat dissipation capacity of the battery cell 20.

[0036] Optionally, the heat deformation temperature of the first insulation layer 30 is in a range of 220°C to 280°C.

[0037] In particular, the thermal deformation temperature of the first insulation layer 30 must be neither too low nor too high. If the thermal deformation temperature is too high, this is detrimental to the heat dissipation of the cylindrical battery. If the thermal deformation temperature is too low, there is insufficient resistance to the high temperature generated by the connection arrangement 14.

[0038] For example, the heat deformation temperature of the first insulation layer can be 220°C, 240°C, 260°C or 280°C, or any value between two of these values.

[0039] Optionally, the heat deformation temperature of the second insulation layer 40 is in a range of 100°C to 150°C.

[0040] In particular, the thermal deformation temperature of the second insulating layer 40 must be neither too low nor too high. If the thermal deformation temperature is too high, this is detrimental to the heat dissipation of the cylindrical battery. If the thermal deformation temperature is too low, the second insulating layer 40 will rapidly undergo thermal deformation upon heating, which can easily lead to insulation failure; and the second insulating layer 40 may even deform or melt at normal operating temperatures of the cylindrical battery.

[0041] For example, the heat deformation temperature of the second insulation layer can be 100°C, 110°C, 120°C, 130°C, 140°C or 150°C, or any value between two of these values.

[0042] Furthermore, it must be ensured that the heat deformation temperature of the first insulation layer 30 is higher than the heat deformation temperature of the second insulation layer 40.

[0043] Furthermore, in the aforementioned arrangement of the first and second output terminals, the housing 10 serves as the first output terminal and the terminal assembly 14 as the second output terminal. In this case, the first electrode tab is electrically connected to the housing 10, and the second electrode tab is electrically connected to the terminal assembly 14.

[0044] As in Fig. As shown in Figure 3, in the technical solution of this embodiment, there is a distance d1 between the edge of the first insulation layer 30, which faces the first end wall 12, and the first end wall 12 in a range of 0 to 4 mm along the axial direction of the battery cell 20.

[0045] It should be noted that the above range does not include d1 0.

[0046] In particular, the first end wall 12 carries an overcurrent during operation of the cylindrical battery and therefore generates a large amount of heat, reaching a high temperature. The distance d1 should therefore be set to a suitable value.

[0047] First, the distance d1 must not be too small. If d1 is too small, this means that the first insulating layer 30 is too close to the first end wall 12, and when the cylindrical battery is in operation, heat can be transferred more easily from the first end wall 12 to the first insulating layer 30, which is more likely to cause it to melt.

[0048] Secondly, the distance d1 must not be too large. If d1 is too large, this means that the first insulation layer 30 is too far from the first end wall 12, resulting in a larger exposed area on the surface of the battery cell 20 and reducing the insulation and heat dissipation performance of the first insulation layer 30 with respect to the battery cell 20. Optionally, the distance d1 can be 0.5 mm, 1 mm, 2 mm, 3 mm, or 4 mm, or any value between these two values.

[0049] Furthermore, in the technical solution of this embodiment, the dimension d2 of the first insulation layer 30 should be smaller than the dimension d3 of the second insulation layer 40 along the axial direction of the battery cell 20.

[0050] Especially for insulation layers, improved high-temperature resistance leads to reduced heat dissipation. Therefore, if the dimension d2 of the first insulation layer 30 is too large, it will impair heat dissipation from the cylindrical battery, particularly in the area near the top of the battery where heat is concentrated. In this case, the heat cannot be dissipated to the outside, which can easily lead to thermal runaway of the cylindrical battery. Therefore, the dimension d2 of the first insulation layer 30 must be set relatively small.

[0051] Since the second insulating layer 40 has a relatively poor high-temperature resistance, it also exhibits a higher heat dissipation capacity. Accordingly, the dimension d3 of the second insulating layer 40 must be set relatively large to ensure the overall heat dissipation performance of the cylindrical battery.

[0052] Therefore, in this embodiment, taking into full consideration of the above factors, the dimension d2 of the first insulation layer 30 is smaller than the dimension d3 of the second insulation layer 40.

[0053] As in Fig. As shown in Figure 3, in the technical solution of this embodiment, the ratio of the dimension d2 of the first insulation layer 30 to the dimension d3 of the second insulation layer 40 lies in a range of 0.04 to 0.21 along the axial direction of the battery cell 20.

[0054] As from Fig. As can be seen in Figure 3, the dimension d2 of the first insulation layer 30 refers to the in Fig. 3 shown direction to the height of the first insulation layer 30 in the vertical direction, and the dimension d3 of the second insulation layer 40 refers to the height of the second insulation layer 40 in the vertical direction.

[0055] First, the ratio of dimension d2 of the first insulation layer 30 to dimension d3 of the second insulation layer 40 must not be too large. If this ratio is too large, it means that the height of the first insulation layer 30 is relatively large compared to the height of the second insulation layer 40. As mentioned above, although the first insulation layer 30 has a higher high-temperature resistance, its heat dissipation capacity is comparatively lower. If the ratio of d2 to d3 is too large, the overall heat dissipation performance of the battery cell 20 is reduced. Since the height of the second insulation layer 40 is greater than that of the first insulation layer 30, the second insulation layer 40 also serves to secure and wrap the battery cell 20.If the dimension d3 of the second insulation layer 40 is relatively small, the winding and fastening capability of the second insulation layer 40 on the battery cell 20 decreases, causing the interior of the battery cell 20 to become loose and impairing the performance of the cylindrical battery.

[0056] Secondly, the ratio of dimension d2 of the first insulation layer 30 to dimension d3 of the second insulation layer 40 must not be too small. If this ratio is too small, it means that the height of the first insulation layer 30 is relatively low compared to the height of the second insulation layer 40. This would reduce the total surface area of ​​the first insulation layer 30, diminish its ability to withstand high temperatures, and facilitate heat transfer from the first end wall 12 further downwards from the first insulation layer 30 to the second insulation layer 40, potentially causing the second insulation layer 40 to melt.

[0057] Optionally, the ratio of dimension d2 of the first insulation layer 30 to dimension d3 of the second insulation layer 40 can be 0.04, 0.08, 0.1, 0.15, 0.2 or 0.21, or any value between two of these values.

[0058] Furthermore, in the technical solution of this embodiment, the dimension d2 of the first insulation layer 30 lies in a range of 8 mm to 18 mm along the axial direction of the battery cell 20.

[0059] In particular, the height d2 of the first insulation layer 30 should be within a suitable range. If the dimension d2 is too large, the first insulation layer 30 will be larger with poor heat dissipation, thus impairing the overall heat dissipation capacity of the cylindrical battery. If the dimension d2 is too small, the second insulation layer 40 will still be attached to the high-temperature area near the first end wall 12, which can easily lead to melting and insulation failure of the second insulation layer 40.

[0060] For example, the dimension d2 of the first insulation layer can be 8 mm, 9 mm, 10 mm, 12 mm, 15 mm or 18 mm, or any value between two of these values.

[0061] In the technical solution of this embodiment, if the radius of the cylindrical battery is greater than or equal to 40 mm, the ratio of the dimension d2 of the first insulation layer 30 to the dimension d3 of the second insulation layer 40 lies in a range of 0.06 to 0.18.

[0062] Specifically, for cylindrical batteries, the larger the radius, the larger the radius of the battery cell, and therefore the higher the energy density and the more heat is generated during operation. Particularly at the top (the position of the first end wall 12), where heat is more concentrated and the temperature is higher, the dimension d2 of the first insulation layer 30 should be appropriately increased to cope with the high temperature. That is, if the radius of the cylindrical battery is larger, the ratio of dimension d2 of the first insulation layer 30 to dimension d3 of the second insulation layer 40 should be appropriately increased.

[0063] As in Fig. As shown in Figure 4, in the technical solution of this embodiment the first insulating layer 30 and the second insulating layer 40 have an overlapping section 50, and along the axial direction of the battery cell 20 the dimension d4 of the overlapping section 50 lies in a range of 0 to 4 mm.

[0064] It should be noted that the above range does not include d4 0.

[0065] In particular, the overlapping section 50 can be formed in two ways: The first insulation layer 30 covers a part of the second insulation layer 40 downwards (towards the second end wall 13), or the second insulation layer 40 covers a part of the first insulation layer 30 upwards (towards the first end wall 12).

[0066] The reason for providing the overlapping section 50 in this embodiment is to ensure that the entire outer circumferential surface of the battery cell 20 is completely enclosed by the first insulating layer 30 and the second insulating layer 40, thereby ensuring the insulation performance for the battery cell 20 and improving heat dissipation.

[0067] In some embodiments not shown, the following may be present: Fig. In the direction shown in Figure 3, the lower edge of the first insulation layer 30 and the upper edge of the second insulation layer 40 may also be arranged so that they butt up precisely against each other or have a certain distance from each other.

[0068] As in Fig. 4 is shown, and with reference to the in Fig. In the direction shown in Figure 4, the dimension d4 of the overlapping section 50 refers to the height value of the overlapping section 50.

[0069] First, the dimension d4 of the overlapping section 50 must not be too large. If the value of d4 is too large, it indicates that there is too much overlap between the first insulating layer 30 and the second insulating layer 40. On the one hand, a thicker overlapping section 50 will occupy space within the cylindrical battery, resulting in a reduced capacity. On the other hand, it indicates that there is too much overlap between the first insulating layer 30 and the second insulating layer 40, which facilitates heat transfer from the first insulating layer 30 downwards to the second insulating layer 40, potentially leading to melting of the second insulating layer 40.

[0070] Secondly, the dimension d4 of the overlapping section 50 must not be too small. If the value of d4 is too small, it indicates that there is insufficient overlap between the first insulation layer 30 and the second insulation layer 40, and heat cannot be quickly conducted from the first insulation layer through the second insulation layer, leading to excessive heat in the first insulation layer.

[0071] For example, the dimension d4 of the overlapping section 50 can be 0.05 mm, 1 mm, 1.5 mm, 2 mm, 3 mm or 4 mm, or any value between two of these values.

[0072] Furthermore, the technical solution of this embodiment is such that the ratio of an area of ​​an end surface of the first electrode tab to an area of ​​an end surface of the second electrode tab is in a range of 0.5 to 1, and the distance from the edge of the overlapping section 50 on the side near the first end wall 12 to the first end wall 12 is in a range of 10 mm to 18 mm.

[0073] Since the overlapping section 50 is formed by the overlap of the first insulation layer 30 and the second insulation layer 40, its thickness is particularly greater and impedes heat dissipation. Therefore, in this embodiment, it is necessary to keep the overlapping section 50 at a certain distance from the upper region (i.e., the first end wall 12) where heat is concentrated. That is, at the point where in Fig.In the content shown in Figure 4, the distance from the upper edge of the overlapping section 50 to the first end wall 12 lies in a range of 10 mm to 18 mm.

[0074] For example, the distance from the edge of the overlapping section 50 on the side near the first end wall 12 to the first end wall 12 can be 10 mm, 12 mm, 14 mm, 15 mm, 16 mm or 18 mm, or any value between two of these values.

[0075] Furthermore, in the technical solution of this embodiment, the ratio of the thickness of the first insulation layer 30 to the thickness of the second insulation layer 40 is in a range of 0.6 to 1.2.

[0076] Specifically, in this embodiment, priority is given to setting a greater thickness for the first insulation layer 30 compared to the second insulation layer 40 in order to improve the high-temperature resistance of the first insulation layer 30, thereby making it less likely that heat will be transferred from the first insulation layer 30 downwards to the second insulation layer 40.

[0077] First, the ratio of the thickness of the first insulating layer 30 to the thickness of the second insulating layer 40 must not be too large. If this ratio is too large, it means that the thickness of the first insulating layer 30 is relatively thick compared to the thickness of the second insulating layer 40. A thicker first insulating layer 30 takes up space in the cylindrical battery, thus reducing its capacity.

[0078] Secondly, the ratio of the thickness of the first insulation layer 30 to the thickness of the second insulation layer 40 must not be too small. If this ratio is too small, it means that the thickness of the first insulation layer 30 is close to that of the second insulation layer 40. A relatively thin first insulation layer 30 reduces its high-temperature resistance, which allows heat to be transferred more easily from the first insulation layer 30 down to the second insulation layer 40, potentially causing the second insulation layer 40 to melt.

[0079] For example, the ratio of the thickness of the first insulation layer 30 to the thickness of the second insulation layer 40 can be 0.6, 0.8, 1 or 1.2, or any value between two of these values.

[0080] The present application also provides a battery pack. According to one embodiment of the battery pack of the present application, it includes the cylindrical battery described above.

[0081] Obviously, the embodiments described above are merely examples for illustration and do not limit the possible implementations. For the average person skilled in the art, other forms of modification or variations can be made based on the above description. There is neither the need nor the possibility of listing all possible implementations here. Any obvious changes or modifications derived therefrom fall within the scope of protection of the present invention.

Claims

[1] Cylindrical battery comprising a housing (10) and a battery cell (20) arranged in the housing (10), wherein the battery cell (20) comprises a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab are both located on the same side of the battery cell (20) and the first electrode tab and the second electrode tab have opposite polarities;the housing (10) comprises a circumferential side wall (11), a first end wall (12) and a second end wall (13) located at both ends of the circumferential side wall (11), wherein a connection arrangement (14) is arranged on the first end wall (12), a first output terminal is arranged on the housing (10) of the cylindrical battery and a second output terminal is arranged on the first end wall (12), wherein a first insulating layer (30) and a second insulating layer (40) are arranged on an outer circumferential surface of the battery cell (20), wherein the first insulating layer (30) is arranged near the first end wall (12), wherein the second insulating layer (40) is located on one side of the first insulating layer (30) opposite the first end wall (12), and wherein a heat deformation temperature of the first insulating layer (30) is higher than a heat deformation temperature of the second insulating layer (40). [2] Cylindrical battery according to claim 1, wherein the thermal deformation temperature of the first insulation layer (30) is in a range of 220 to 280°C and / or the thermal deformation temperature of the second insulation layer (40) is in a range of 100 to 150°C. [3] Cylindrical battery according to one of the preceding claims, wherein the housing (10) serves as the first output terminal, the connection arrangement (14) serves as the second output terminal, and the first electrode tab and the second electrode tab are electrically connected to the housing (10) and the connection arrangement (14), respectively. [4] Cylindrical battery according to one of the preceding claims, wherein the electrode tabs are welded to the output terminals on an end cover of the battery. [5] Cylindrical battery according to one of the preceding claims, wherein the second end wall (13) is connected to the end of the circumferential side wall (11) and these may be integrally formed or joined by welding, adhesive or fasteners. [6] Cylindrical battery according to one of the preceding claims, wherein along an axial direction of the battery cell (20) there is a distance (d1) between an edge of the first insulating layer (30) facing the first end wall (12) and the first end wall (12) in a range of 0 to 4 mm. [7] Cylindrical battery according to one of the preceding claims, wherein along the axial direction of the battery cell (20) a dimension (d2) of the first insulating layer (30) is smaller than a dimension (d3) of the second insulating layer (40). [8] Cylindrical battery according to one of the preceding claims, wherein along the axial direction of the battery cell (20) the ratio of the dimension (d2) of the first insulating layer (30) to the dimension (d3) of the second insulating layer (40) is in a range of 0.04 to 0.

21. [9] Cylindrical battery according to any of the preceding claims, wherein, if the radius of the cylindrical battery is greater than or equal to 40 mm, the ratio of the dimension (d2) of the first insulating layer (30) to the dimension (d3) of the second insulating layer (40) is in a range of 0.06 to 0.

18. [10] Cylindrical battery according to one of the preceding claims, wherein the dimension (d2) of the first insulating layer (30) is in a range of 8 mm to 18 mm along the axial direction of the battery cell (20). [11] Cylindrical battery according to one of the preceding claims, wherein the first insulating layer (30) and the second insulating layer (40) have an overlapping section (50) and a dimension (d4) of the overlapping section (50) along the axial direction of the battery cell (20) is in a range of 0 to 4 mm. [12] Cylindrical battery according to claim 11, wherein, if the ratio of an area of ​​an end surface of the first electrode tab to an area of ​​an end surface of the second electrode tab is in a range of 0.5 to 1, the distance between an edge of the overlapping section (50) on one side near the first end wall (12) and the first end wall (12) is in a range of 10 mm to 18 mm. [13] Cylindrical battery according to any one of claims 1 to 12, wherein the ratio of the thickness of the first insulating layer (30) to the thickness of the second insulating layer (40) is in a range of 0.6 to 1.

2. [14] Cylindrical battery according to any of the preceding claims, wherein the thickness of the first insulating layer (30) is greater than the thickness of the second insulating layer (40). [15] Cylindrical battery according to one of the preceding claims, wherein an insulating film is wrapped around the outer surface of the battery cell. [16] Battery pack comprising the cylindrical battery according to any one of claims 1 to 15. [17] Vehicle or new energy vehicle with a battery pack according to claim 16.

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