Cylindrical battery cover plate structure and cylindrical battery

Abstract

The utility model discloses a cylindrical battery cover plate structure and a cylindrical battery, and relates to the technical field of batteries. The cylindrical battery cover plate structure comprises a shell, a cylindrical battery cover plate and a cover plate, the positive electrode cover plate is connected with one end of the shell; the positive electrode confluence plate is close to one side of the positive electrode cover plate and is connected with the inner wall of the shell; wherein the shell and the positive electrode confluence plate are integrally formed, so that the positive electrode confluence plate is arranged in the shell according to a preset position. The utility model solves the problems that the positive and negative electrode cover plate structure of the conventional cylindrical battery consists of a terminal, an upper plastic (upper insulating part), a sealing ring, a top cover sheet, a lower plastic, a riveting pole and a confluence disc, the number of cover plate components is large, the assembly of structural parts is not facilitated, and the risk of liquid leakage exists in a sealing mode of compressing the sealing ring.

Description

Technical Field

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

[0002] With the continuous development of the new energy field, cylindrical batteries are being used more and more widely due to their advantages such as high energy density.

[0003] Currently, the positive and negative electrode cover structure of cylindrical batteries consists of terminals, upper plastic (upper insulating component), sealing rings, top cover sheet, lower plastic, riveted terminals, and busbars. This structure suffers from a large number of cover components, which hinders structural assembly, and the sealing method using compression sealing rings carries a risk of leakage. No effective solution has yet been proposed to address these issues. Utility Model Content

[0004] Purpose of the utility model: To provide a cylindrical battery cover structure and a cylindrical battery, so as to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A cylindrical battery cover structure, comprising:

[0006] case;

[0007] The positive electrode cover plate is connected to one end of the housing; and

[0008] The positive electrode busbar is located near the positive electrode cover and is connected to the inner wall of the housing.

[0009] The housing and the positive electrode busbar are integrally formed so that the positive electrode busbar is positioned inside the housing according to a preset location.

[0010] Preferably, the shell has an H-shaped cross-section.

[0011] Preferably, the positive electrode cover plate has grooves on the side near the positive electrode manifold for depressurization of the explosion-proof valve.

[0012] Preferably, the cross-section of the groove is V-shaped.

[0013] Preferably, the width of the groove is 0.5-0.7 mm and the depth of the groove is 0.6-0.7 mm.

[0014] Preferably, a gap is reserved between the positive electrode cover and the positive electrode busbar, and the positive electrode cover, the positive electrode busbar and the shell are arranged to form a cavity.

[0015] Preferably, the height of the spacing is greater than or equal to 0.5 mm.

[0016] Preferably, the positive electrode busbar has several through holes evenly distributed along its circumference.

[0017] Preferably, the through hole includes: a circular hole opened at the center of the housing, and a plurality of irregular holes evenly distributed around the circular hole.

[0018] Preferably, the positive electrode cover plate has a liquid injection hole on the side near the positive electrode manifold.

[0019] Preferably, the positive electrode cover is made of aluminum.

[0020] To achieve the above objectives, according to another aspect of this application, a cylindrical battery is also provided.

[0021] The cylindrical battery according to this application includes the cylindrical battery cover structure as described above;

[0022] It also includes: a negative electrode cover plate, which is connected to the housing on the side away from the positive electrode cover plate;

[0023] A core is provided on the side of the positive electrode busbar away from the positive electrode cover plate.

[0024] Beneficial effects: In this embodiment, a simplified structure is achieved by integral molding. The housing and the positive electrode busbar are integrally molded, so that the positive electrode busbar is set in the housing according to a preset position. This achieves the purpose of integral molding of the housing and the positive electrode busbar, thereby reducing the number of assembly parts, reducing assembly difficulty, and reducing production costs. It also solves the technical problems of the current cylindrical battery positive and negative electrode cover structure, which consists of terminals, upper plastic (upper insulating part), sealing ring, top cover, lower plastic, riveted electrode post and busbar. The cover assembly has a large number of components, which is not conducive to the assembly of structural parts. In addition, the sealing method of compression sealing ring has the risk of leakage. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cylindrical battery structure using the cylindrical battery cover plate structure of this utility model;

[0026] Figure 2 This is a cross-sectional view of a cylindrical battery using the cylindrical battery cover structure of this utility model;

[0027] Figure 3 This is a partially enlarged cross-sectional view of a cylindrical battery using a cylindrical battery cover structure, according to this utility model; and

[0028] Figure 4 This is a schematic diagram of the through-hole structure of the cylindrical battery cover plate of this utility model.

[0029] The attached figures are labeled as follows:

[0030] 10. Shell;

[0031] 20. Positive electrode cover; 201. Score;

[0032] 30. Positive busbar;

[0033] 40. Through hole; 401. Round hole; 402. Irregularly shaped hole;

[0034] 50. Cavity. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figure 1-4As shown, this application relates to a cylindrical battery cover structure and a cylindrical battery. The cylindrical battery cover structure includes a housing 10; the housing 10 is a shell-like protective body that provides good protection and can also cooperate with other components to achieve multiple functions. Preferably, the housing 10 is an H-shaped aluminum housing 10; this ensures good physical performance requirements, such as light weight and corrosion resistance; and is easy to implement and process.

[0040] The positive electrode cover 20 is connected to one end of the housing 10. The positive electrode cover 20 is a crucial component of the cylindrical battery, its main function being to achieve a mechanical seal inside the battery, thereby ensuring good assembly and structural stability. Of course, the connection methods between the positive electrode cover 20 and the housing 10 include, but are not limited to, welding.

[0041] The positive electrode busbar 30 is located near the positive electrode cover plate 20 and connected to the inner wall of the housing 10. The positive electrode busbar 30 is used to collect the current from multiple positive electrode tabs in the battery, which can achieve a good electrical connection effect.

[0042] It should be noted that the connection between the positive electrode busbar 30 and the inner wall of the housing 10 includes, but is not limited to, welding.

[0043] The housing 10 and the positive electrode busbar 30 are integrally formed, so that the positive electrode busbar 30 is disposed in the housing 10 according to a preset position. By adopting an integrally formed structure for the housing 10 and the positive electrode busbar 30, traditional assembly steps can be eliminated, and contact resistance problems in processes such as welding and pressing can be avoided.

[0044] By using a pre-set mold, the positive electrode busbar 30 is directly placed inside the housing 10 in a pre-set position to ensure precise docking between the electrode tab and the busbar.

[0045] The integrated structure has no additional connection points, reducing the potential for seal failure and mechanical fatigue.

[0046] This application optimizes the aluminum shell and cover plate structure, simplifies the cover plate structure design, improves the reliability of the battery structure, and reduces the manufacturing cost of structural components. At the same time, it optimizes the bending process after welding the cell busbar to prevent poor sealing and welding around the cover due to abnormal bending, thereby improving the process yield of the cell assembly process.

[0047] As can be seen from the above description, this application achieves the following technical effects:

[0048] In this embodiment, a simplified structure is achieved by integral molding. The housing 10 and the positive electrode busbar 30 are integrally molded, so that the positive electrode busbar 30 is set in the housing 10 according to a preset position. This achieves the purpose of integral molding of the housing 10 and the positive electrode busbar 30, thereby reducing the number of assembly parts, reducing assembly difficulty, and reducing production costs. This solves the technical problems of the current cylindrical battery positive and negative electrode cover structure, which consists of terminals, upper plastic (upper insulating part), sealing ring, top cover plate, lower plastic, riveted electrode post and busbar, resulting in a large number of cover components, which is not conducive to the assembly of structural parts, and the risk of leakage due to the sealing method of compression sealing ring.

[0049] Furthermore, the cross-section of the housing 10 is H-shaped. This ensures both good accommodating effect and good structural strength.

[0050] like Figure 3 As shown, the positive electrode cover 20 has a groove 201 for pressure relief of the explosion-proof valve on the side near the positive electrode manifold 30. It can be understood that by providing the groove 201, when the internal pressure of the battery rises abnormally, the groove 201 guides the pressure relief path, preventing the battery casing from bursting, thereby improving the safety of the battery.

[0051] Furthermore, the cross-section of the notch 201 is V-shaped. It is understood that by adopting a V-shape, the triggering accuracy and intensity distribution of the explosion-proof valve can be optimized, which helps to reliably trigger under specific pressures and minimizes the uncertainty of material fracture.

[0052] It is important to know that the V-shaped notch 201 creates significant stress concentration points at the sharp part. When the pressure increases to a certain level, these points are the first to break, thereby controlling the location and timing of the pressure relief trigger point.

[0053] Furthermore, the width of the notch 201 is 0.5-0.7 mm, and the depth of the notch 201 is 0.6-0.7 mm. It is understood that by adopting the above-mentioned numerical range, good processing technology and battery safety can be ensured.

[0054] Specifically, the width of the notch 201 (0.5-0.7mm) directly affects the strength and trigger sensitivity of the notch 201.

[0055] The smaller width (0.5mm) enhances stress concentration, resulting in lower and more precise triggering pressure.

[0056] The larger width (0.7mm) increases the overall strength of the 201 notch structure and prevents accidental triggering.

[0057] Low-power batteries: Choose a smaller width to ensure lower trigger pressure.

[0058] High-power batteries: Choose a wider width to accommodate greater internal pressure.

[0059] The depth of the 201 notch (0.6-0.7 mm) determines the strength of the weak point of the 201 notch and directly affects the fracture pressure.

[0060] Within the range of 0.6-0.7mm, the trigger sensitivity of the 201 notch can be ensured, while avoiding excessive machining that would lead to insufficient overall strength of the cover plate.

[0061] Furthermore, a gap is reserved between the positive electrode cover plate 20 and the positive electrode manifold 30, and the positive electrode cover, the positive electrode manifold 30, and the housing 10 enclose a cavity 50. It is understood that by reserving a gap, the effect of placing other media can be achieved, thereby achieving a good fit. The cavity 50 can be used for liquid storage and gas collection, etc.

[0062] Furthermore, the height of the spacing is greater than or equal to 0.5 mm. This ensures sufficient space is provided.

[0063] Furthermore, the positive electrode busbar 30 has a plurality of through holes 40 evenly distributed along its circumference. This allows for good gas conduction while also optimizing current conduction and heat dissipation within the battery.

[0064] like Figure 4 As shown, the through hole 40 includes: a circular hole 401 opened at the center of the housing 10, and a plurality of irregularly shaped holes 402 evenly distributed around the circular hole 401. It can be understood that the circular hole 401, located at the center of the housing 10, typically serves as the main conductive path or gas venting channel. It has the following functions: current conduction: providing a central point for current flow; gas venting: providing a concentrated release channel for gas inside the battery, especially at high temperatures or during overcharging, helping to vent gas to prevent explosion; strength maintenance: circular holes can generally better distribute stress structurally, reducing material damage.

[0065] The irregularly shaped holes 402 surround the circular holes 401, forming a uniform distribution. Common shapes include rectangles, ovals, hexagons, or fan shapes. They have the following advantages: heat dissipation optimization: the design of the irregularly shaped holes 402 helps to improve air circulation, enhance heat exchange, and improve heat dissipation performance; current distribution: the unique geometry of the irregularly shaped holes 402 helps to distribute the current more evenly within the busbar, avoiding local overheating caused by excessive current concentration; gas circulation: it increases gas exhaust channels, reduces internal pressure buildup, and improves battery safety.

[0066] Furthermore, the positive electrode cover plate 20 has a liquid injection hole (not shown in the figure) on the side near the positive electrode manifold 30. It can be understood that this facilitates liquid injection.

[0067] Furthermore, the positive electrode cover 20 is made of aluminum. This ensures the battery's structural strength, sealing performance, and good thermal conductivity; it is also easy to implement and operate.

[0068] Specifically, the positive electrode side cover is a minimalist cover and is a top cover, eliminating the traditional plastic and bent manifold. The middle part of the cover is designed with explosion-proof grooves 201 to increase the explosion-proof pressure relief area.

[0069] This application also relates to a cylindrical battery, including the cylindrical battery cover structure as described above;

[0070] It also includes: a negative electrode cover plate (not shown in the figure), which is connected to the housing 10 on the side away from the positive electrode cover plate 20;

[0071] The positive electrode busbar 30 has a core (not shown in the figure) on the side away from the positive electrode cover plate 20.

[0072] Specifically, the negative electrode cover is connected to the housing 10 and is usually located at the bottom of the battery or on the side away from the positive electrode cover 20. Its main function is to seal the negative terminal of the battery and protect it from external influences. The negative electrode cover usually needs to form a sealed connection with the housing 10 to ensure that the inside of the battery is not affected by external environments such as air and moisture, thereby avoiding corrosion and degradation of battery performance. The negative electrode cover needs to have a certain strength to withstand the pressure fluctuations generated inside the battery and prevent leakage or rupture.

[0073] The core refers to the electrolyte storage section between the negative and positive electrode materials in a battery, typically formed by winding multiple electrode sheets. Placing the core on the side of the positive electrode busbar 30 away from the positive electrode cover 20 can improve the battery's energy density and stability.

[0074] The core design is a key part of energy storage in batteries. By winding the electrode sheets, the internal reaction area of ​​the battery can be increased, thereby improving the charging and discharging efficiency of the battery.

[0075] This utility model also has the following beneficial effects:

[0076] 1. Solve the problems of complex cover plate structure, numerous parts, difficult assembly of cover plate structural components, and high cost;

[0077] 2. Solve the problem that during the battery cell assembly process, the cover plate needs to be bent by the busbar, which results in a low yield rate and occupies height space, affecting the battery cell capacity;

[0078] 3. Solve the problem of low pressure relief efficiency caused by the aluminum cover plate welded explosion-proof plate structure of the explosion-proof valve.

[0079] 4. By adopting a minimalist cover plate, a simple cover plate structure can be achieved;

[0080] 5. By using an H-shaped aluminum shell, the manifold and the aluminum shell can be integrally molded.

[0081] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A cylindrical battery cover structure, characterized in that, include: Shell (10); A positive electrode cover plate (20) is connected to one end of the housing (10); and The positive electrode busbar (30) is located near the positive electrode cover plate (20) and connected to the inner wall of the housing (10); The housing (10) and the positive electrode busbar (30) are integrally formed so that the positive electrode busbar (30) is set in the housing (10) according to a preset position.

2. The cylindrical battery cover structure according to claim 1, characterized in that, The shell (10) has an H-shaped cross-section.

3. The cylindrical battery cover structure according to claim 1, characterized in that, The positive electrode cover plate (20) is provided with a groove (201) for depressurization of the explosion-proof valve on the side near the positive electrode manifold (30).

4. The cylindrical battery cover structure according to claim 3, characterized in that, The cross-section of the notch (201) is V-shaped.

5. The cylindrical battery cover structure according to claim 3, characterized in that, The width of the groove (201) is 0.5-0.7 mm, and the depth of the groove (201) is 0.6-0.7 mm.

6. The cylindrical battery cover structure according to claim 1, characterized in that, A gap is reserved between the positive electrode cover plate (20) and the positive electrode manifold (30), and the positive electrode cover, the positive electrode manifold (30) and the shell (10) enclose a cavity (50).

7. The cylindrical battery cover structure according to claim 6, characterized in that, The height of the spacing is greater than or equal to 0.5 mm.

8. The cylindrical battery cover structure according to claim 1, characterized in that, The positive electrode busbar (30) has several through holes (40) evenly distributed along its circumference.

9. The cylindrical battery cover structure according to claim 8, characterized in that, The through hole (40) includes: a circular hole (401) opened at the center of the housing (10), and a plurality of irregular holes (402) evenly distributed around the circular hole (401).

10. The cylindrical battery cover structure according to claim 1, characterized in that, The positive electrode cover plate (20) has a liquid injection hole on the side near the positive electrode manifold (30).

11. The cylindrical battery cover structure according to claim 1, characterized in that, The positive electrode cover plate (20) is made of aluminum sheet.

12. A cylindrical battery, characterized in that, Includes the cylindrical battery cover structure as described in any one of claims 1-11; It also includes: a negative electrode cover plate, which is connected to the housing (10) on the side away from the positive electrode cover plate (20); The positive electrode manifold (30) has a core on the side away from the positive electrode cover plate (20).

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