Cylindrical battery confluence plate

Abstract

The utility model discloses a cylindrical battery convergence plate. The cylindrical battery confluence plate can be applied to the technical field of battery protection, the confluence plate is arranged above a roll core of a cylindrical battery, and a shell is arranged on the outer side of the roll core; the convergence disc is of a circular structure with the concave interior, and a preset number of turns of through grooves are formed in the plane of the circular structure and used for releasing stress generated when the shell is subjected to external impact or the roll core is heated to expand. According to the scheme, the stability of the battery can be improved.

Description

Technical Field

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

[0002] Cylindrical lithium battery is a lithium battery with an overall cylindrical shape. Cylindrical lithium battery is a battery type that has been studied, analyzed, and discussed technically. Cylindrical lithium battery is mainly composed of positive electrode, negative electrode, diaphragm, positive and negative collector, valve, overcurrent protection device, insulation and shell. Cylindrical lithium battery mainly includes lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary material lithium battery. Each cylindrical lithium battery has different advantages. The battery is commonly used in laptops, digital cameras, lighting equipment, children's toy products, pneumatic tools, new energy vehicles, portable mobile energy and other fields.

[0003] Cylindrical batteries are relatively stable under normal circumstances, but when the cylindrical battery is subjected to external impact or its core part expands due to heat, the force of the core on the weld between the busbar and the tab will increase, which may cause the weld to crack, thereby reducing the weld's overcurrent capacity and increasing the temperature rise of the battery cell, thereby increasing the possibility of thermal runaway of the battery and reducing the stability of the battery. Utility Model Content

[0004] Based on this, it is necessary to provide a cylindrical battery busbar that can improve the stability of the battery in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a cylindrical battery busbar, the busbar is arranged above the winding core of the cylindrical battery, and a shell is arranged outside the winding core;

[0006] The busbar is a circular structure with a depression inside, and a preset number of through grooves are provided on the plane of the circular structure to release stress generated when the shell is subjected to external impact or the winding core expands due to heat.

[0007] In one embodiment, the through grooves are distributed on the inner and outer circles of the plane of the circular structure;

[0008] The through grooves of the inner ring and the through grooves of the outer ring work together to release stress generated when the housing is subjected to external impact or the winding core expands due to heat.

[0009] In one of the embodiments, a circular hole is provided at the center of the busbar, and the circular hole is used for injecting electrolyte and ensuring smooth splashing channel during thermal runaway.

[0010] In one of the embodiments, the cylindrical battery further includes a cover plate;

[0011] The cover plate is welded to the outer circumference of the busbar and to the center of the busbar.

[0012] In one embodiment, the area between the inner ring and the outer ring of the busbar is welded to the tab of the winding core.

[0013] In one of the embodiments, two adjacent circles of through grooves in the inner and outer circles of the plane of the circular structure are arranged in an annular staggered rotation.

[0014] In one embodiment, the housing is made of metal.

[0015] The above-mentioned cylindrical battery busbar is arranged above the winding core of the cylindrical battery, and an outer shell is arranged on the outer side of the winding core; the busbar is a circular structure with an internal depression, and a preset number of through grooves are arranged on the plane of the circular structure to release the stress generated when the outer shell is subjected to external impact or when the winding core is heated and expanded. Compared with the existing cylindrical battery busbar, the cylindrical battery busbar of the present application reduces the possibility of cracking of the weld by arranging an annular through groove on the busbar to release the stress, thereby ensuring the current capacity of the busbar and the lug welding point to prevent the increase of temperature rise, and achieving the technical effect of improving the stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional side view of a cylindrical battery in one embodiment;

[0017] Figure 2 A top view of a cylindrical battery busbar in one embodiment.

[0018] Marking instructions: 1-busbar; 2-winding core; 3-housing; 4-cover plate; 11-through slot. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] Cylindrical lithium batteries are lithium batteries with an overall cylindrical shape. Cylindrical lithium batteries are a type of battery that has been studied, analyzed, and discussed technically. Cylindrical lithium batteries are mainly composed of positive electrodes, negative electrodes, diaphragms, positive and negative collectors, valves, overcurrent protection devices, insulating parts, and shells. Cylindrical lithium batteries mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary material lithium batteries. Each type of cylindrical lithium battery has different advantages, and the battery is commonly used in laptops, digital cameras, lighting equipment, children's toy products, pneumatic tools, new energy vehicles, portable mobile energy and other fields. Cylindrical batteries are very stable under normal circumstances, but when the cylindrical battery is subjected to external impact or its winding core part is heated and expanded, the force of the winding core on the weld between the busbar and the pole ear will increase, which may cause the weld to crack, thereby causing the weld to have a reduced overcurrent capacity, and the temperature rise of the battery cell increases, thereby increasing the possibility of thermal runaway of the battery, resulting in poor stability of the battery. Based on this, the embodiment of the present application provides a cylindrical battery busbar to improve the above technical problems.

[0021] In one embodiment, Figure 1 is a cross-sectional side view of a cylindrical battery provided according to an embodiment of the present application, Figure 2 It is a top view of a cylindrical battery busbar provided according to an embodiment of the present application, wherein the busbar 1 is arranged above the winding core 2 of the cylindrical battery, and a shell 3 is arranged outside the winding core 2;

[0022] The busbar 1 is a circular structure with a depression inside, and a preset number of through grooves 11 are provided on the plane of the circular structure to release stress generated when the housing 3 is subjected to external impact or the winding core 2 expands due to heat.

[0023] It should be noted that the busbar 1 is circular in shape and is made of metal materials such as copper, aluminum, etc. The embodiment of the present application does not limit the type of material of the busbar 1. At the same time, the thickness of the busbar can generally be set to 0.3 mm, or it can be set to other thicknesses. The embodiment of the present application does not limit the thickness of the busbar 1. The busbar 1 is welded to the winding core 2 by welding. A preset number of through grooves 11 are provided on the busbar 1 to release the stress generated when the outer shell 3 is subjected to external impact or the winding core 2 is heated and expanded, thereby preventing the cylindrical battery from being damaged due to impact or heat, and greatly extending the service life of the cylindrical battery.

[0024] Optionally, the through grooves 11 are distributed on the inner circle and the outer circle of the plane of the circular structure. The through grooves 11 are distributed on the inner circle and the outer circle of the plane of the circular structure.

[0025] It should be noted that the two adjacent inner circles of through grooves 11 are evenly distributed at an angle of 90 degrees around the central axis, and the width can be set to 0.5mm, and the spacing can be set to 0.5mm; the two adjacent outer circles of through grooves 11 are evenly distributed at an angle of 90 degrees around the central axis, and the width can be set to 0.5mm, and the spacing can be set to 1.5mm, or can be set to other thicknesses and. The embodiment of the present application does not limit the thickness of the through grooves 11 and the spacing between two adjacent circles of through grooves 11.

[0026] Furthermore, the number of inner and outer circles distributed on the plane of the circular structure is at least two, and the number of inner and outer circles distributed on the plane of the circular structure may be the same or different. The embodiment of the present application does not limit the setting of the number of inner and outer circles.

[0027] Optionally, a circular hole 12 is provided at the center of the busbar 1, and the circular hole 12 is used for injecting electrolyte and ensuring smooth splashing channel during thermal runaway.

[0028] Optionally, the cylindrical battery further includes a cover plate 4 , which is welded to the outer circumference of the busbar 1 and to the center of the busbar 1 .

[0029] Optionally, the area between the inner ring and the outer ring of the busbar 1 is welded to the pole lug of the winding core 2 .

[0030] It should be noted that since the area between the inner ring and the outer ring is welded to the pole ear of the winding core 2, and the inner ring and the outer ring are both provided with a preset number of through grooves 11, the stress of the area between the inner ring and the outer ring can be released to prevent the welding point between the area between the inner ring and the outer ring and the pole ear of the winding core 2 from cracking, thereby improving the stability of the battery.

[0031] Optionally, two adjacent circles of through grooves 11 of the inner and outer circles of the plane of the circular structure are arranged in an annular staggered rotation.

[0032] It should be noted that the through grooves 11 of the inner and outer rings of the circular structure are arranged in an annular staggered manner with an angle of 45 degrees.

[0033] Optionally, the shell 3 is made of metal, such as steel, aluminum, etc. The embodiment of the present application does not limit the type of material of the inner side of the cover plate 1 and the inner step and the shell 3.

[0034] The above cylindrical battery busbar includes a busbar, a shell and a winding core. The busbar is located above the winding core, the shell is located outside the winding core, and the busbar is provided with a preset number of through grooves, which are used to release the stress generated when the shell is subjected to external impact or the winding core is heated and expanded. Compared with the existing cylindrical battery busbar, the cylindrical battery busbar of the present application reduces the possibility of cracking of the weld by providing an annular through groove on the busbar to release the stress, thereby ensuring the current capacity of the busbar and the lug welding point to prevent the increase of temperature rise, and achieving the technical effect of improving the stability of the battery.

[0035] It should be noted that the information involved in this application (including but not limited to the information related to the cylindrical battery busbar in this application, etc.) are all information or data fully authorized by all parties.

[0036] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A cylindrical battery busbar, characterized in that: The busbar is arranged above the winding core of the cylindrical battery, and a shell is arranged outside the winding core; The busbar is a circular structure with a depression inside, and a preset number of through grooves are arranged on the plane of the circular structure to release stress generated when the shell is subjected to external impact or the winding core expands due to heat.

2. The cylindrical battery busbar according to claim 1, characterized in that: The through grooves are distributed on the inner circle and the outer circle of the plane of the circular structure; The through grooves of the inner ring and the through grooves of the outer ring work together to release stress generated when the outer shell is subjected to external impact or when the winding core expands due to heat.

3. The cylindrical battery busbar according to claim 1, characterized in that: A circular hole is provided at the center of the busbar, and the circular hole is used for injecting electrolyte and ensuring smooth splashing channel during thermal runaway.

4. The cylindrical battery busbar according to claim 1, characterized in that: The cylindrical battery also includes a cover plate; The cover plate is welded to the outer circumference of the busbar and to the center of the busbar.

5. The cylindrical battery busbar according to claim 2, characterized in that: The area between the inner ring and the outer ring of the busbar is welded to the pole lug of the winding core.

6. The cylindrical battery busbar according to claim 2, characterized in that: The two adjacent circles of through grooves of the inner and outer circles of the plane of the circular structure are arranged in an annular staggered rotation.

7. The cylindrical battery busbar according to claim 1, characterized in that: The shell is made of metal.

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