Tab and battery

Abstract

The utility model relates to a tab and a battery, and relates to the technical field of batteries, the tab comprises a polymer layer and a metal layer, the metal layer coats the peripheral wall of the polymer layer, and the polymer layer is used for realizing shrinkage and fracture when reaching a preset temperature and driving the metal layer to realize shrinkage and fracture. According to the tab and the battery, the tab can realize the automatic fusing function of the fuse structure, so that the independent fuse design in the battery is canceled, the condition that the internal resistance is increased due to the fuse design is avoided, and the energy efficiency of the battery is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a tab and a battery. Background Art

[0002] In order to protect the battery, a fuse structure is usually designed on the battery connector. When the current exceeds a certain value, the fuse will automatically blow to prevent safety accidents caused by excessive current. However, in the related art, the fuse design will increase the internal resistance of the connector and reduce the energy efficiency of the battery. Utility Model Content

[0003] In order to solve the above technical problems, an embodiment of the present application provides a pole ear and a battery, wherein the pole ear itself can realize the automatic fusing function of the fuse structure, thereby eliminating the separate fuse design in the battery, avoiding the increase of internal resistance due to the fuse design, and effectively improving the energy efficiency of the battery.

[0004] In a first aspect, a tab is provided, comprising:

[0005] polymer layer;

[0006] A metal layer, covering the peripheral wall of the polymer layer;

[0007] The polymer layer is used to shrink and break when reaching a preset temperature, and drives the metal layer to shrink and break.

[0008] According to the first aspect of the present application, the thickness of the polymer layer is A, the thickness of the metal layer coated on at least one side of the polymer layer is B, and A≥4B.

[0009] According to the first aspect of the present application, the tab further comprises:

[0010] A first connecting portion, used to connect a pole or a connecting piece;

[0011] A second connection part, used for connecting the winding core, wherein the second connection part is provided with a breakable part, and the breakable part is broken when the preset temperature is reached;

[0012] The third connection portion is located between the first connection portion and the second connection portion, and opposite sides of the third connection portion are respectively connected to the first connection portion and the second connection portion.

[0013] According to the first aspect of the present application, the breakable portion includes a plurality of hollow holes penetrating along the thickness direction of the pole ear, and the plurality of hollow holes are spaced apart along a first preset direction; wherein the first preset direction represents the length direction of the winding core.

[0014] According to the first aspect of the present application, the spacing between relatively close side edges of any two adjacent hollow holes in the first preset direction is the same.

[0015] According to the first aspect of the present application, the hollow hole is any one of a rectangular hole, a circular hole or a polygonal hole.

[0016] According to the first aspect of the present application, the length of the hollow hole in the first preset direction is C, the length in the second preset direction is D, the length of the tab in the first preset direction is E, and the length of the tab in the second preset direction is F; 0.3E≤C≤0.7E, 0.05F≤D≤0.2F;

[0017] Among them, the first preset direction represents the length direction of the winding core; the second preset direction represents the height direction of the winding core; and the first preset direction is perpendicular to the second preset direction.

[0018] According to the first aspect of the present application, the length of the first connecting portion in the second preset direction is H, the length of the second connecting portion in the second preset direction is K, the length of the third connecting portion in the second preset direction is M, and the length of the pole ear in the second preset direction is F; 0.3F≤H≤0.4F, 0.1F≤K≤0.2F, 0.4F≤M≤0.5F.

[0019] According to the first aspect of the present application, the length of the second connecting portion in the second preset direction is K, and the distance between the end surface of the winding core used to set the pole ear and the surface of the top cover facing the winding core in the second preset direction is J, K≤J;

[0020] Wherein, the second preset direction represents the height direction of the winding core, and the top cover is provided with the pole.

[0021] In a second aspect, a battery is also provided, comprising:

[0022] A shell with an opening, a winding core and a top cover are provided, wherein the top cover is used to seal the opening of the shell, the winding core is located in the cavity of the shell, and the winding core is provided with a pole ear as described in the previous embodiment.

[0023] The electrode ear and battery provided in the embodiment of the present application include a polymer layer and a metal layer, wherein the metal layer is coated on the peripheral wall of the polymer layer. When a short circuit occurs in the circuit, the temperature sensitivity of the polymer layer is utilized so that when the polymer layer reaches a preset temperature, it shrinks and breaks, and then drives the metal layer to shrink and break, thereby cutting off the circuit. In this way, the original separate fuse design in the battery can be eliminated, thereby avoiding the increase of internal resistance due to the fuse design, and effectively improving the energy efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0025] Figure 1 A cross-sectional view of a pole ear provided in accordance with an exemplary embodiment of the present application.

[0026] Figure 2 A schematic diagram of the structure of a winding core, a top cover and a pole ear provided in an exemplary embodiment of the present application.

[0027] Figure 3 A schematic diagram of the structure of a pole ear provided in an exemplary embodiment of the present application.

[0028] Figure 4 A schematic diagram of the structure of a pole ear provided in another exemplary embodiment of the present application.

[0029] Figure numerals: 100 - ear; 110 - polymer layer; 120 - metal layer; 130 - first connecting portion; 140 - second connecting portion; 141 - hollow hole; 150 - third connecting portion; 160 - easy-to-break portion; 200 - winding core; 300 - top cover; 310 - connecting piece. DETAILED DESCRIPTION

[0030] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described here.

[0031] Figure 1 A cross-sectional view of a tab provided by an exemplary embodiment of the present application. Figure 1 As shown, the tab 100 provided in the embodiment of the present application may include a polymer layer 110 and a metal layer 120 , and the metal layer 120 is coated on the peripheral wall of the polymer layer 110 .

[0032] During the normal operation of the pole tab 100, current passes through the pole tab 100, and the temperature of the pole tab 100 increases. In the event of a short circuit, the pole tab 100 generates a large amount of heat, and the polymer layer 110 is sensitive to temperature. When the polymer layer 110 reaches a preset temperature (which can be set according to actual conditions, such as 150°C or 160°C), the polymer layer 110 will shrink (i.e., shrink due to high temperature) and break. When the polymer layer 110 shrinks and breaks, the polymer layer 110 will drive the external metal layer 120 to shrink and break, so that the pole tab 100 can be melted, the circuit can be cut off, safety accidents can be avoided, and the safety of the battery can be improved.

[0033] It should be understood that the tab 100 provided in the embodiment of the present application can realize the automatic fusing function of the fuse structure, that is, when a short circuit occurs in the circuit, the temperature sensitivity of the polymer layer 110 is utilized so that when the polymer layer 110 reaches a preset temperature, it shrinks and breaks, and then drives the metal layer 120 to shrink and break, thereby cutting off the circuit. In this way, the original separate fuse design in the battery can be eliminated, avoiding the increase of internal resistance due to the fuse design, and effectively improving the energy efficiency of the battery.

[0034] like Figure 1 As shown, the thickness of the polymer layer 110 is A, the thickness of the metal layer 120 coated on at least one side of the polymer layer 110 is B, and A ≥ 4 B. In this way, on the one hand, the overall structural strength of the polymer layer 110 can be ensured, and on the other hand, the polymer layer 110 can be broken at a high temperature, and the metal layer 120 can be driven to break.

[0035] In one embodiment, the thickness A of the polymer layer 110 may be selected within the range of 2-10 μm. For example, the thickness A may be 2 μm, 6 μm, 10 μm, etc.

[0036] In one embodiment, the thickness B of the metal layer 120 may be selected within the range of 1-4 μm. For example, the thickness B may be 1 μm, 2 μm, 4 μm, etc.

[0037] In one embodiment, the material of the polymer layer 110 can be PET polyethylene terephthalate, PP polypropylene, PI polyimide film, etc.

[0038] In one embodiment, the material of the metal layer 120 may be copper, aluminum, etc.

[0039] Figure 2 This is a schematic diagram of the structure of the winding core, the top cover and the tab provided by an exemplary embodiment of the present application. Figure 2As shown, an embodiment of the present application further provides a battery, which may include a shell, a winding core 200 and a top cover 300, wherein the winding core 200 is located in the cavity of the shell, and the winding core 200 is provided with a pole ear 100 as described in the previous embodiment, and the top cover 300 is used to seal the opening of the shell.

[0040] Figure 3 This is a schematic diagram of the structure of a tab provided by an exemplary embodiment of the present application. Figure 2 and Figure 3 As shown, a connecting piece 310 is provided on the top cover 300, and a pole is provided on the top cover 300, and the pole is connected to a part of the connecting piece 310. The pole lug 100 may include a first connecting portion 130, a second connecting portion 140 and a third connecting portion 150. The first connecting portion 130 is connected to another part of the connecting piece 310 to achieve current transmission. The second connecting portion 140 is used to connect the winding core 200. The third connecting portion 150 is located between the first connecting portion 130 and the second connecting portion 140. The opposite sides of the third connecting portion 150 are respectively connected to the first connecting portion 130 and the second connecting portion 140. The second connecting portion 140 is provided with a breakable portion 160, and the breakable portion 160 can be melted at the first time when the preset temperature is reached, thereby cutting off the circuit in time.

[0041] It should be noted that the location where the easily breakable portion 160 is provided is along the length direction of the tab 100 ( Figure 2 and Figure 3 The cross-sectional area in the direction indicated by the arrows P and Q in the middle is smaller than that in other parts, and the internal resistance is larger. When a short circuit occurs in the circuit, the temperature of the part where the fragile part 160 is provided is higher, causing the polymer layer 110 to shrink and break, and driving the metal layer 120 to break, thereby cutting off the circuit more quickly and improving the safety of the battery.

[0042] In one embodiment, the connecting piece 310 may not be provided between the first connecting portion 130 and the pole, and the first connecting portion 130 may be directly connected to the pole to achieve current transmission.

[0043] In one embodiment, the breakable portion 160 may include a hollow hole 141, and the hollow hole 141 is disposed along the length direction of the tab 100 ( Figure 2 and Figure 3 The cross-sectional area in the direction indicated by the arrows P and Q is smaller than that in other parts, and the internal resistance is larger, which can achieve the effect of rapid fuse.

[0044] In one embodiment, the breakable portion 160 may include a narrowing portion, the narrowing portion extending along the length direction of the tab 100 ( Figure 2 and Figure 3 The cross-sectional area in the direction indicated by the arrows P and Q in the middle is smaller than that in other parts, and the internal resistance is larger. Therefore, the narrowed part can also achieve the effect of rapid fuse.

[0045] like Figure 2 and Figure 3 As shown, the breakable portion 160 includes a plurality of hollow holes 141 penetrating along the thickness direction of the tab 100, and the plurality of hollow holes 141 are spaced apart along a first preset direction, which can be understood as Figure 2 The length direction of the middle winding core 200 ( Figure 2 and Figure 3 In this way, the parts where multiple hollow holes 141 are provided can all achieve the effect of rapid fusing, which can effectively improve the fusing efficiency and cut off the short-circuited circuit more quickly.

[0046] like Figure 2 and Figure 3 As shown, in the case of providing a plurality of hollow holes 141, any two adjacent hollow holes 141 are relatively close to the two side edges in the first preset direction ( Figure 2 and Figure 3 The spacing in the direction indicated by the arrows P and Q in the figure is the same, that is, the multiple hollow holes 141 are evenly distributed along the first preset direction. In this way, the evenly distributed multiple hollow holes 141 can help to achieve more uniform heating and fusing. During the fusing process, the stress distribution of the material will be more uniform, which helps to reduce the stress concentration and deformation that may occur during the fusing process, and can reduce the difficulty of fusing and the risk of deformation, thereby improving the fusing quality.

[0047] In one embodiment, the hollow hole 141 may be any one of a rectangular hole, a circular hole, and a polygonal hole.

[0048] The following describes the hollow hole 141 by taking a rectangular hole as an example. Figure 4 This is a schematic diagram of the structure of a tab provided by another exemplary embodiment of the present application. Figure 4 As shown, the hollow hole 141 can be set as a rectangular hole. This facilitates better design of structural dimensions and improves processing efficiency. Its specific dimension parameters will be described in detail later.

[0049] like Figure 4 As shown, the length of the hollow hole 141 in the first preset direction is C, and the length in the second preset direction is D. The length of the tab 100 in the first preset direction is E, and the length of the tab 100 in the second preset direction is F.

[0050] It should be noted that the first preset direction can be understood as the length direction of the core 200 ( Figure 2 and Figure 4 The second preset direction can be understood as the height direction of the winding core 200 ( Figure 2 and Figure 4The first preset direction is perpendicular to the second preset direction.

[0051] It should be noted that the length C can be taken in the range of 0.3E≤C≤0.7E, so that it can be ensured that the length of the hollow hole 141 in the first preset direction accounts for the length of the entire pole lug 100 in the first preset direction within a preferred range, which can ensure the overall strength of the pole lug 100, and at the same time ensure that the corresponding part of the hollow hole 141 can shrink and break at the preset temperature, so as to achieve the effect of cutting off the circuit. Similarly, the length D can be taken in the range of 0.05F≤D≤0.2F, so that it can be ensured that the length of the hollow hole 141 in the second preset direction accounts for the length of the entire pole lug 100 in the second preset direction within a preferred range, which can ensure the overall strength of the pole lug 100, and at the same time ensure that the corresponding part of the hollow hole 141 can shrink and break at the preset temperature, so as to achieve the effect of cutting off the circuit.

[0052] like Figure 3 As shown, the first connection portion 130 is in the second preset direction ( Figure 3 The length of the first connection part 130 in the direction indicated by the arrows R and S is H, and the length of the pole ear 100 in the second preset direction is F. The length H can be taken in the range of 0.3F≤H≤0.4F. In this way, it can be ensured that the first connection part 130 has sufficient length to connect the pole, which facilitates the welding of the first connection part 130 and the pole.

[0053] In one embodiment, the length H of the first connection portion 130 in the second preset direction can be selected to be 0.3F, 0.36F, 0.4F, etc.

[0054] like Figure 3 As shown, the length of the second connection portion 140 in the second preset direction is K, and the length K can be within the range of 0.1F≤K≤0.2F, so that it can be ensured that there is a sufficiently large area of ​​the second connection portion 140 to set the hollow hole 141.

[0055] In one embodiment, the length K of the second connection portion 140 in the second preset direction can be selected to be 0.1F, 0.16F, 0.2F, etc.

[0056] like Figure 3 As shown, the length of the third connection part 150 in the third preset direction is M, and the length M can be within the range of 0.4F≤M≤0.5F. In this way, the third connection part 150 can be prevented from occupying too large a portion of the first connection part 130 and the third connection part 150.

[0057] It should be noted that after the pole or adapter 310 on the top cover 300 is connected to the first connecting portion 130, the top cover 300 needs to be pressed down to be assembled on the battery opening. At this time, the position of the top cover 300 moves downward. For example, the top cover 300 can be moved to Figure 3 At the position indicated by the middle arrow T, after the top cover 300 is pressed down and assembled into the battery opening, the distance between the end surface of the winding core 200 for setting the pole ear 100 and the surface of the top cover 300 facing the winding core 200 in the second preset direction is J, and the length of the second connecting portion 140 in the second preset direction is K.

[0058] It should be noted that the distance K and the distance J satisfy the following relationship: K≤J. Thus, after the second connection portion 140 of the tab 100 is broken, it can be avoided that the first and second broken ends overlap each other due to the short distance J, resulting in the tab 100 being unable to cut off the current in time.

[0059] It should be understood that, in actual applications, the position of the top cover 300 after moving downward may not only be moved to the position indicated by the arrow T, but also may be above or below the position indicated by the arrow T, as long as J≥K is ensured.

[0060] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0061] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0062] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0063] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0064] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A tab, characterized in that: include: A polymer layer (110); A metal layer (120) coated on the peripheral wall of the polymer layer (110); The polymer layer (110) is used to shrink and break when a preset temperature is reached, and drives the metal layer (120) to shrink and break.

2. The tab according to claim 1, characterized in that: The thickness of the polymer layer (110) is A, the thickness of the metal layer (120) coated on at least one side of the polymer layer (110) is B, and A≥4B.

3. The tab according to claim 1, characterized in that: The tab also includes: A first connecting portion (130) used for connecting a pole or a connecting piece (310); A second connecting portion (140) is used to connect the winding core (200), the second connecting portion (140) is provided with a breakable portion (160), and the breakable portion (160) breaks when the preset temperature is reached; The third connecting portion (150) is located between the first connecting portion (130) and the second connecting portion (140), and opposite sides of the third connecting portion (150) are respectively connected to the first connecting portion (130) and the second connecting portion (140).

4. The tab according to claim 3, characterized in that: The breakable portion (160) comprises a plurality of hollow holes (141) penetrating along the thickness direction of the tab, and the plurality of hollow holes (141) are distributed at intervals along a first preset direction; wherein the first preset direction represents the length direction of the winding core (200).

5. The electrode tab according to claim 4, characterized in that: The spacing between relatively close side edges of any two adjacent hollow holes (141) in the first preset direction is the same.

6. The tab according to claim 4, characterized in that: The hollow hole (141) is any one of a rectangular hole, a circular hole or a polygonal hole.

7. The tab according to claim 6, characterized in that: The length of the hollow hole (141) in the first preset direction is C, the length in the second preset direction is D, the length of the pole ear in the first preset direction is E, and the length of the pole ear in the second preset direction is F; 0.3E≤C≤0.7E, 0.05F≤D≤0.2F; Wherein, the first preset direction represents the length direction of the winding core (200); the second preset direction represents the height direction of the winding core (200); and the first preset direction is perpendicular to the second preset direction.

8. The tab according to claim 3, characterized in that: The length of the first connection portion (130) in the second preset direction is H, the length of the second connection portion (140) in the second preset direction is K, the length of the third connection portion (150) in the second preset direction is M, and the length of the tab in the second preset direction is F; 0.3F≤H≤0.4F, 0.1F≤K≤0.2F, 0.4F≤M≤0.5F.

9. The tab according to claim 3, characterized in that: The length of the second connecting portion (140) in the second preset direction is K, and the distance between the end surface of the winding core (200) used to set the pole ear and the surface of the top cover (300) facing the winding core (200) in the second preset direction is J, K≤J; The second preset direction represents the height direction of the winding core (200), and the top cover (300) is provided with the pole.

10. A battery, characterized in that: include: A shell body with an opening, a winding core (200) and a top cover (300) are provided, wherein the top cover (300) is used to seal the opening of the shell body, the winding core (200) is located in a cavity of the shell body, and the winding core (200) is provided with a pole ear as described in any one of claims 1 to 9.

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