A cylindrical lithium battery

Abstract

The utility model provides a kind of cylindrical lithium battery, comprising: cylindrical cell heat dissipation component, cylindrical cell heat dissipation component includes cylindrical cell structure and the heat dissipation structure wrapped in the cylindrical outer surface of cylindrical cell structure;Respectively set in the positive output component and negative output component of cylindrical cell heat dissipation component both ends;Insulating shell component, insulating shell component includes the insulating sleeve structure wrapped in the cylindrical outer surface of heat dissipation structure, the positive insulating cap structure threadedly connected in one end of insulating sleeve structure, the positive insulating cover structure fixedly connected in the inner circle of positive insulating cap structure and covers the outer circle edge of positive output component upper surface far from one end of cylindrical cell structure, the negative insulating cap structure threadedly connected in the one end of insulating sleeve structure far from positive insulating cap structure and the negative insulating cover structure fixedly connected in the inner circle of negative insulating cap structure and covers the outer circle edge of negative output component upper surface far from one end of cylindrical cell structure.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cylindrical lithium battery. Background Technology

[0002] Cylindrical lithium batteries are lithium-ion batteries with a cylindrical metal casing. Their model numbers are indicated by a five-digit code representing their diameter and height.

[0003] In existing technologies, most cylindrical lithium batteries use a metal casing to directly encase the battery cell, relying on natural air convection for heat dissipation. This leads to heat accumulation during high-rate charging and discharging, which can easily accelerate cell aging and even cause thermal runaway. The insulating casing of existing cylindrical lithium batteries is mostly encapsulated by a single injection-molded part, which is difficult to disassemble and maintain. Furthermore, the exposed current collector is prone to short circuits due to foreign object intrusion. The welding of the positive and negative terminals and the current collector of existing cylindrical lithium batteries usually uses planar contact, resulting in a small welding area. Under vibration or high-current conditions, there is a risk of poor welding or breakage. In addition, unreasonable tolerance design of the fit between the cap and the terminal may lead to increased contact resistance. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a cylindrical lithium battery that can effectively solve the shortcomings of the prior art.

[0005] A cylindrical lithium battery, comprising:

[0006] A cylindrical battery cell heat dissipation assembly, comprising a cylindrical battery cell structure and a heat dissipation structure wrapped around the cylindrical outer surface of the cylindrical battery cell structure;

[0007] A positive output component disposed at one end of the positive electrode of the cylindrical cell heat dissipation assembly;

[0008] A negative output component is disposed at one end of the negative electrode of the cylindrical cell heat dissipation assembly.

[0009] An insulating housing assembly includes an insulating sleeve structure wrapped around the outer surface of the cylindrical heat dissipation structure, a positive insulating cap structure threaded to one end of the insulating sleeve structure and wrapped around the outer surface of the cylindrical positive output component, a positive insulating cover structure fixedly connected to the inner ring of the positive insulating cap structure away from the cylindrical cell structure and covering the outer edge of the upper surface of the positive output component, a negative insulating cap structure threaded to the outer surface of the cylindrical negative output component and wrapped around the outer surface of the cylindrical negative output component and wrapped around the end of the insulating sleeve structure away from the positive insulating cap structure, and a negative insulating cover structure fixedly connected to the inner ring of the negative insulating cap structure away from the cylindrical cell structure and covering the outer edge of the upper surface of the negative output component.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: By wrapping a heat dissipation structure on the cylindrical outer surface of the cylindrical cell structure, the close fit between the heat dissipation structure and the cylindrical cell structure can evenly dissipate the heat inside the cell, reduce the interface thermal resistance, reduce the risk of local hot spots, avoid relying on natural air convection for heat dissipation, which would lead to heat accumulation during high-rate charging and discharging, and prevent the cell from aging faster or even causing thermal runaway; by setting the insulating shell assembly separately, the positive electrode insulating cap structure and the negative electrode insulating cap structure are both threadedly connected to the insulating sleeve structure to achieve quick assembly and disassembly of the insulating shell assembly. At the same time, the positive electrode insulating cover structure and the negative electrode insulating cover structure respectively cover the outer edge of the upper surface of the positive electrode output component and the negative electrode output component, preventing short circuits caused by foreign objects intruding due to the exposed edge of the current collector.

[0011] Furthermore, the positive output component includes a positive current collector plate disposed at one end of the positive electrode of the cylindrical cell structure, a positive electrode post welded to the positive current collector plate, and a positive electrode insulating cap sleeved on the positive electrode post.

[0012] Furthermore, a positive electrode welding groove is provided at the center of the top of the positive electrode current collector. The diameter of the positive electrode welding groove gradually decreases from top to bottom. The diameter of the top of the positive electrode welding groove is A, and the diameter of the bottom of the positive electrode welding groove is B.

[0013] Furthermore, the diameter of the positive electrode gradually increases from top to bottom, with the diameter of the top of the positive electrode being C and the diameter of the bottom of the positive electrode being D, where A < D < B.

[0014] Furthermore, the diameter of the inner hole of the positive electrode insulating cap is E, where C < E < D.

[0015] Furthermore, the negative electrode output component includes a negative electrode current collector plate disposed at one end of the negative electrode of the cylindrical cell structure, a negative electrode post welded to the negative electrode current collector plate, and a negative electrode insulating cap sleeved on the negative electrode post.

[0016] Furthermore, a negative electrode welding groove is provided at the center of the top of the negative electrode current collector. The diameter of the negative electrode welding groove gradually decreases from top to bottom, with the diameter of the top of the negative electrode welding groove being F and the diameter of the bottom of the negative electrode welding groove being G.

[0017] Furthermore, the diameter of the negative electrode gradually increases from top to bottom, with the diameter of the top of the negative electrode being H and the diameter of the bottom of the negative electrode being I, where F < I < G.

[0018] Furthermore, the diameter of the inner hole of the negative electrode insulating cap is J, where H < J < I.

[0019] Furthermore, the heat dissipation structure is specifically made of graphene. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the cylindrical lithium battery in the embodiment of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the cylindrical battery cell heat dissipation assembly with an insulating sleeve structure in an embodiment of this utility model.

[0022] Figure 3 This is a top view of the heat dissipation assembly of the cylindrical battery cell with an insulating sleeve in an embodiment of this utility model.

[0023] Figure 4 This is an exploded view of the positive output component and the positive insulating cap structure in an embodiment of this utility model;

[0024] Figure 5 This is an exploded view of the negative output component and the negative insulating cap structure in an embodiment of this utility model.

[0025] Explanation of key component symbols:

[0026] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model.

[0027] Cylindrical cell structure 11 Negative electrode insulating cover 33 Heat dissipation structure 12 Negative electrode welding groove 34 Positive output component 20 Insulating housing assembly 40 Positive current collector 21 Insulating sleeve structure 41 Positive terminal 22 Positive electrode insulating cap structure 42 Positive electrode insulating cap 23 Positive electrode insulating cover structure 43 Positive electrode welding groove 24 Negative electrode insulating cap structure 44 Negative output component 30 Negative electrode insulating cover structure 45 Negative collector disk 31 Detailed Implementation

[0028] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please see Figures 1 to 5A cylindrical lithium battery according to an embodiment of this utility model includes:

[0032] A cylindrical battery cell heat dissipation assembly 10, the cylindrical battery cell heat dissipation assembly 10 includes a cylindrical battery cell structure 11 and a heat dissipation structure 12 wrapped around the cylindrical outer surface of the cylindrical battery cell structure 11;

[0033] Furthermore, the heat dissipation structure 12 is specifically made of graphene.

[0034] Understandably, by wrapping the heat dissipation structure 12 on the cylindrical outer surface of the cylindrical cell structure 11, the close fit between the heat dissipation structure 12 and the cylindrical cell structure 11 can uniformly dissipate the heat inside the cell, reduce the interface thermal resistance, reduce the risk of local hot spots, avoid relying on natural air convection for heat dissipation, which would lead to heat accumulation during high-rate charging and discharging, and prevent the cell from aging faster or even causing thermal runaway.

[0035] Positive output component 20 is disposed at one positive end of the cylindrical cell heat dissipation assembly 10;

[0036] Furthermore, the positive output component 20 includes a positive current collector 21 disposed at one end of the positive electrode of the cylindrical cell structure 11, a positive electrode post 22 welded to the positive current collector 21, and a positive electrode insulating cap 23 sleeved on the positive electrode post 22.

[0037] Furthermore, a positive electrode welding groove 24 is provided at the center of the top of the positive electrode current collector 21. The diameter of the positive electrode welding groove 24 gradually decreases from top to bottom. The diameter of the top of the positive electrode welding groove 24 is A, and the diameter of the bottom of the positive electrode welding groove 24 is B.

[0038] Furthermore, the diameter of the positive electrode post 22 gradually increases from top to bottom, with the diameter of the top of the positive electrode post 22 being C and the diameter of the bottom of the positive electrode post 22 being D, where A < D < B.

[0039] Furthermore, the diameter of the inner hole of the positive electrode insulating cap 23 is E, where C < E < D.

[0040] Understandably, by setting the diameter of the positive electrode welding groove 24 to gradually decrease from top to bottom, with the diameter of the top of the positive electrode welding groove 24 being A, the diameter of the bottom of the positive electrode welding groove 24 being B, and the diameter of the bottom of the positive electrode post 22 being D, where A < D < B, the positive electrode welding groove 24 can play a positioning role, and the inverted conical setting of the positive electrode welding groove 24 can increase the welding contact area, enhance shear resistance and vibration resistance.

[0041] Understandably, by setting the diameter of the positive terminal 22 to gradually increase from top to bottom, with the diameter of the top of the positive terminal 22 being C, the diameter of the bottom of the positive terminal 22 being D, and the diameter of the inner hole of the positive terminal insulating cover 23 being E, where C < E < D, the positive terminal insulating cover 23 and the positive terminal 22 are interference-fitted to ensure stable contact between the positive terminal 22 and the external circuit.

[0042] A negative output component 30 is disposed at one negative end of the cylindrical cell heat dissipation assembly 10.

[0043] Furthermore, the negative output component 30 includes a negative current collector 31 disposed at one end of the negative electrode of the cylindrical cell structure 11, a negative electrode post 32 welded to the negative current collector 31, and a negative electrode insulating cap 33 sleeved on the negative electrode post 32.

[0044] Furthermore, a negative electrode welding groove 34 is provided at the center of the top of the negative electrode current collector 31. The diameter of the negative electrode welding groove 34 gradually decreases from top to bottom. The diameter of the top of the negative electrode welding groove 34 is F, and the diameter of the bottom of the negative electrode welding groove 34 is G.

[0045] Furthermore, the diameter of the negative electrode post 32 gradually increases from top to bottom, with the diameter of the top of the negative electrode post 32 being H and the diameter of the bottom of the negative electrode post 32 being I, where F < I < G.

[0046] Furthermore, the diameter of the inner hole of the negative electrode insulating cap 33 is J, where H < J < I.

[0047] Understandably, by setting the diameter of the negative electrode welding groove 34 to gradually decrease from top to bottom, with the diameter of the top of the negative electrode welding groove 34 being A, the diameter of the bottom of the negative electrode welding groove 34 being B, and the diameter of the bottom of the negative electrode post 32 being D, where A < D < B, the negative electrode welding groove 34 can play a positioning role, and the inverted conical setting of the negative electrode welding groove 34 can increase the welding contact area, enhance shear resistance and vibration resistance.

[0048] Understandably, by setting the diameter of the negative terminal 32 to gradually increase from top to bottom, with the diameter of the top of the negative terminal 32 being C, the diameter of the bottom of the negative terminal 32 being D, and the diameter of the inner hole of the negative terminal insulating cover 33 being E, where C < E < D, the negative terminal insulating cover 33 and the negative terminal 32 are interference-fitted to ensure stable contact between the negative terminal 32 and the external circuit.

[0049] An insulating housing assembly 40 includes an insulating sleeve structure 41 wrapped around the cylindrical outer surface of the heat dissipation structure 12, a positive electrode insulating cap structure 42 wrapped around the cylindrical outer surface of the positive electrode output component 20 and threaded to one end of the insulating sleeve structure 41, a positive electrode insulating cover structure 43 fixedly connected to the inner ring of the positive electrode insulating cap structure 42 away from the cylindrical cell structure 11 and covering the outer edge of the upper surface of the positive electrode output component 20, a negative electrode insulating cap structure 44 wrapped around the cylindrical outer surface of the negative electrode output component 30 and threaded to the end of the insulating sleeve structure 41 away from the positive electrode insulating cap structure 42, and a negative electrode insulating cover structure 45 fixedly connected to the inner ring of the negative electrode insulating cap structure 44 away from the cylindrical cell structure 11 and covering the outer edge of the upper surface of the negative electrode output component 30.

[0050] It should be noted that, specifically in this embodiment, the end of the positive electrode post 22 away from the cylindrical cell structure 11 passes through the positive electrode insulating cover structure 43 and extends toward the end away from the cylindrical cell structure 11, and the end of the negative electrode post 32 away from the cylindrical cell structure 11 passes through the negative electrode insulating cover structure 45 and is flush with the end of the negative electrode insulating cover structure 45 away from the cylindrical cell structure 11.

[0051] It should be noted that, specifically in this embodiment, thread sealant is applied between the positive electrode insulating cap structure 42 and the negative electrode insulating cap structure 44 and the insulating sleeve structure 41.

[0052] Understandably, by setting the insulating housing assembly 40 in a split manner, the positive electrode insulating cap structure 42 and the negative electrode insulating cap structure 44 are both threadedly connected to the insulating sleeve structure 41 to achieve quick assembly and disassembly of the insulating housing assembly 40. At the same time, the positive electrode insulating cover structure 43 and the negative electrode insulating cover structure 45 respectively cover the outer edge of the upper surface of the positive electrode insulating cover 23 and the negative electrode insulating cover 33, thus preventing short circuits caused by foreign objects intruding due to the exposed edge of the current collector.

[0053] In summary, the cylindrical lithium battery in the above embodiments of this utility model, by wrapping a heat dissipation structure on the cylindrical outer surface of the cylindrical cell structure, and the close fit between the heat dissipation structure and the cylindrical cell structure, can uniformly dissipate the heat inside the cell, reduce interface thermal resistance, reduce the risk of local hot spots, avoid relying on natural air convection for heat dissipation, which would lead to heat accumulation during high-rate charging and discharging, and prevent the cell from aging faster or even causing thermal runaway; by setting the insulating shell assembly separately, the positive electrode insulating cap structure and the negative electrode insulating cap structure are both threadedly connected to the insulating sleeve structure to achieve quick assembly and disassembly of the insulating shell assembly. At the same time, the positive electrode insulating cover structure and the negative electrode insulating cover structure respectively cover the outer edge of the upper surface of the positive electrode output component and the negative electrode output component, preventing foreign objects from entering and causing short circuits due to the exposed edge of the current collector.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cylindrical lithium battery, characterized in that, include: A cylindrical battery cell heat dissipation assembly, comprising a cylindrical battery cell structure and a heat dissipation structure wrapped around the cylindrical outer surface of the cylindrical battery cell structure; A positive output component disposed at one end of the positive electrode of the cylindrical cell heat dissipation assembly; A negative output component is disposed at one end of the negative electrode of the cylindrical cell heat dissipation assembly. An insulating housing assembly includes an insulating sleeve structure wrapped around the outer surface of the cylindrical heat dissipation structure, a positive insulating cap structure threaded to one end of the insulating sleeve structure and wrapped around the outer surface of the cylindrical positive output component, a positive insulating cover structure fixedly connected to the inner ring of the positive insulating cap structure away from the cylindrical cell structure and covering the outer edge of the upper surface of the positive output component, a negative insulating cap structure threaded to the outer surface of the cylindrical negative output component and wrapped around the outer surface of the cylindrical negative output component and wrapped around the end of the insulating sleeve structure away from the positive insulating cap structure, and a negative insulating cover structure fixedly connected to the inner ring of the negative insulating cap structure away from the cylindrical cell structure and covering the outer edge of the upper surface of the negative output component.

2. The cylindrical lithium battery according to claim 1, characterized in that, The positive output component includes a positive current collector plate disposed at one end of the positive electrode of the cylindrical cell structure, a positive electrode post welded to the positive current collector plate, and a positive electrode insulating cap sleeved on the positive electrode post.

3. The cylindrical lithium battery according to claim 2, characterized in that, A positive electrode welding groove is provided at the center of the top of the positive electrode current collector. The diameter of the positive electrode welding groove gradually decreases from top to bottom. The diameter of the top of the positive electrode welding groove is A, and the diameter of the bottom of the positive electrode welding groove is B.

4. The cylindrical lithium battery according to claim 3, characterized in that, The diameter of the positive electrode gradually increases from top to bottom. The diameter of the top of the positive electrode is C, and the diameter of the bottom of the positive electrode is D, where A < D < B.

5. The cylindrical lithium battery according to claim 4, characterized in that, The diameter of the inner hole of the positive electrode insulating cap is E, where C < E < D.

6. The cylindrical lithium battery according to claim 1, characterized in that, The negative output component includes a negative current collector plate disposed at one end of the negative electrode of the cylindrical cell structure, a negative electrode post welded to the negative current collector plate, and a negative electrode insulating cap sleeved on the negative electrode post.

7. The cylindrical lithium battery according to claim 6, characterized in that, A negative electrode welding groove is provided at the center of the top of the negative electrode current collector. The diameter of the negative electrode welding groove gradually decreases from top to bottom. The diameter of the top of the negative electrode welding groove is F, and the diameter of the bottom of the negative electrode welding groove is G.

8. The cylindrical lithium battery according to claim 7, characterized in that, The diameter of the negative electrode gradually increases from top to bottom, with the diameter of the top of the negative electrode being H and the diameter of the bottom of the negative electrode being I, where F < I < G.

9. The cylindrical lithium battery according to claim 8, characterized in that, The diameter of the inner hole of the negative electrode insulating cap is J, where H < J < I.

10. The cylindrical lithium battery according to claim 1, characterized in that, The heat dissipation structure is specifically made of graphene.

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