Novel secondary cylindrical battery

Abstract

The utility model discloses a novel secondary cylindrical battery which comprises a cover plate assembly, a shell and a roll core, and an opening is formed in the shell to be communicated with an accommodating space in the shell; the shell comprises a side wall and a shell bottom cover, the shell bottom cover comprises a welding area and an anti-explosion area, the wall thickness of the welding area is uniform, the welding area is welded with the roll core, and the anti-explosion area is located in the center of the shell bottom cover; according to the novel secondary cylindrical battery provided by the utility model, the welding area of the bottom cover of the shell is welded with the roll core, so that the whole shell is electrified to transmit current, the contact area and the heat dissipation area are increased, and safety accidents such as battery fire caused by insufficient overcurrent area are solved. Meanwhile, the anti-explosion area is arranged in the center area of the bottom cover of the shell to serve as one anti-explosion mechanism, when the battery is subjected to thermal runaway, the anti-explosion area explodes, blockage is not prone to occurring, and therefore the safety of the battery is improved on the whole, and meanwhile the machining and manufacturing cost of the battery is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of secondary batteries, and in particular relates to a novel secondary cylindrical battery. Background Art

[0002] Traditional secondary cylindrical batteries transmit current through adapters that connect to the positive and negative tabs on the winding core, which then electrically connect to the positive and negative tabs, thereby outputting the current. However, due to the limited assembly space and flexibility within the battery, it is difficult to achieve sufficient thickness for the positive and negative adapters to support high current charging and discharging, especially for the positive adapter made of aluminum. Excessive current can lead to increased battery heat generation and even cause safety hazards such as battery fires.

[0003] Therefore, there is an urgent need for a new type of secondary cylindrical battery. By eliminating the positive or negative electrode adapter, the positive and negative electrodes of the battery can be directly welded to the shell, so that the entire shell can transmit current, increase the contact area, and increase the heat dissipation area, thereby solving safety accidents such as battery fires caused by insufficient overcurrent area. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of secondary cylindrical battery to avoid safety accidents caused by excessive heat generation during high current discharge. At the same time, an explosion-proof device is added at the center of the bottom of the battery to avoid fire and explosion accidents caused by thermal runaway due to battery abuse.

[0005] To achieve the above objectives, the technical solution of the battery bottom cover provided by the present invention is:

[0006] A novel secondary cylindrical battery includes a cover plate assembly, a shell, and a winding core. The shell is provided with an opening to connect the internal storage space thereof. The shell includes side walls and a shell bottom cover. The shell bottom cover includes a welding area and an explosion-proof area. The welding area has a uniform wall thickness and is welded to the winding core. The explosion-proof area is located in the center of the shell bottom cover.

[0007] Furthermore, the welding track when the welding zone is welded to the coil core is linear or curved or a combination of linear and curved, and there is at least one welding track.

[0008] Furthermore, a first explosion-proof mechanism is provided on the cover assembly, and a second explosion-proof mechanism is provided in the explosion-proof area at the center of the bottom cover of the shell.

[0009] Furthermore, the first explosion-proof mechanism is an explosion-proof valve

[0010] Furthermore, the shell is a columnar structure with an opening on one side.

[0011] The beneficial effects of the utility model are:

[0012] The novel secondary cylindrical battery provided by this utility model features a welded bottom cover welded to the winding core, allowing the entire housing to be charged for current transmission. This increases the contact area and heat dissipation, thus resolving safety issues such as battery fires caused by insufficient flow area. Furthermore, an explosion-proof zone is provided in the center of the bottom cover as part of the explosion-proof mechanism. In the event of thermal runaway, the explosion-proof zone explodes and is less susceptible to clogging, thereby improving overall battery safety and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 An exploded diagram of the structure of a novel secondary battery provided in an embodiment of the present application;

[0014] Figure 2 A top view of a novel secondary battery provided in an embodiment of the present application;

[0015] Figure 3 for Figure 2 Schematic diagram of the cross section along AA;

[0016] Figure 4 for Figure 3 Enlarged view of the structure at E in the middle;

[0017] Figure 5 for Figure 3 Schematic diagram of the new secondary battery structure from above;

[0018] Figure 6 for Figure 5 The welding trajectory is a schematic diagram of the curve;

[0019] Figure 7 for Figure 5 The welding trajectory is a structural diagram of a combination of straight lines and curves;

[0020] Among them: 1. secondary battery; 11. cover plate assembly; 111. first explosion-proof mechanism; 112. adapter plate; 12. electrode assembly; 121. first pole ear; 122. second pole ear; 13. shell; 131. shell side wall; 132. shell bottom cover; 1321. explosion-proof area; 1322. welding area; W1, penetration welding track. DETAILED DESCRIPTION

[0021] To address the issues raised in the prior art, the core inventive concept of this utility model is to weld the welding area of ​​the housing bottom cover to the winding core, thereby electrifying the entire housing to transmit current, increasing the contact area and heat dissipation, thereby resolving safety issues such as battery fires caused by insufficient flow area. Furthermore, an explosion-proof zone is provided in the center of the housing bottom cover as part of the explosion-proof mechanism. In the event of thermal runaway, the explosion-proof zone explodes and is less susceptible to clogging, thereby improving overall battery safety and reducing manufacturing costs.

[0022] The present invention is further described in detail below with reference to the embodiments.

[0023] Specific embodiments of the single battery provided by the utility model:

[0024] refer to Figure 1-Figure 3 As shown, the novel secondary cylindrical battery 1 of the embodiment of the present invention includes a cover plate assembly 11, a winding core 12 and a shell 13, wherein the shell 13 is open on one side, and the opening is connected to the internal accommodation space.

[0025] When the core is installed, the core 12 is assembled into the shell 13 through the opening of the shell 13 according to a certain polarity, and then the pressure applied to the core 12 makes the second pole ear 122 of the core 12 fit tightly with the welding area 1322 of the shell bottom cover 132, and then the shell 13 is electrically connected to the core 12 by welding, so as to output current to the outside through the shell 13; at the same time, the adapter piece 112 of the cover assembly 11 is electrically connected to the first pole ear 121 of the electrode assembly 12, and then the cover assembly 11 and the shell 13 are assembled and welded, and then sealed by liquid injection to form a complete new secondary cylindrical battery 1.

[0026] In some embodiments, as Figure 1-Figure 3 As shown, the cover assembly 11 is provided with a first explosion-proof mechanism 111 (the first explosion-proof mechanism is an explosion-proof valve), and the central area of ​​the bottom cover 132 of the housing 13 is provided with an explosion-proof area 1321, which serves as a second explosion-proof structure. This allows for a safer explosion and timely discharge of internal gases when thermal runaway occurs due to abuse of the secondary novel cylindrical battery 1, preventing fires, explosions, and other safety accidents.

[0027] In some embodiments, the explosion value settings of the first explosion-proof mechanism 111 and the second explosion-proof mechanism (explosion-proof zone 1321 ) may be the same or different.

[0028] Preferably, the explosion value of the second explosion-proof mechanism (explosion-proof zone 1321 ) is slightly greater than the explosion value of the first explosion-proof mechanism 111 .

[0029] In some embodiments, as Figure 3 and Figure 4The second explosion-proof mechanism (explosion-proof zone 1321) is set in the bottom center area of ​​the new secondary cylindrical battery 1, that is, the center area of ​​the bottom cover 132 of the shell, which corresponds to the center hole of the winding core 12. When the new secondary cylindrical battery 1 is abused and causes thermal runaway, when the second explosion-proof mechanism (explosion-proof zone 1321) explodes and opens, the foil inside the winding core 12 will not be blocked by the explosion zone 1321 under the action of pressure. Even if the explosion-proof zone 1321 is continuously exhausted, the pressure inside the new secondary cylindrical battery 1 is reduced, thereby ensuring the safety of the battery.

[0030] In some embodiments, as Figure 3 and Figure 4 The welding area 1322 on the bottom cover 132 of the housing is directly welded to the second tab 122 of the winding core 12, forming an electrical connection, thereby outputting current. The welding area 1322 on the bottom cover 132 is electrically connected to the second tab 122 of the winding core 12, making the entire housing 13 electrically charged and outputting current. The current output of the entire housing 13 greatly increases the flow and heat dissipation area, thus solving the problem of high-current charging and discharging, and preventing safety accidents such as fire caused by insufficient current flow and excessive heat generation of the adapter.

[0031] In some embodiments, such as Figure 5 、 Figure 6 and Figure 7 In the embodiment, the number of welding tracks W1 between the welding area 1322 of the housing bottom cover 132 and the second tab 122 of the winding core 12 is 2-6.

[0032] Preferably, if Figure 5 , the number of welding tracks W1 is 3.

[0033] In some embodiments, such as Figure 5 、 Figure 6 and Figure 7 In the embodiment, the welding track between the welding area 1322 of the housing bottom cover 132 and the second tab 122 of the winding core 12 is a straight line, a curved line, or a combination of a straight line and a curved line.

[0034] Preferably, if Figure 5 , the welding trajectory W1 is a straight line.

[0035] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A novel secondary cylindrical battery, comprising a cover plate assembly, a housing, and a winding core, characterized in that: The shell is provided with an opening to connect the internal accommodating space thereof; the shell includes side walls and a shell bottom cover, the shell bottom cover includes a welding area and an explosion-proof area, wherein the wall thickness of the welding area is uniform, the welding area is welded to the winding core, and the explosion-proof area is located in the center of the shell bottom cover.

2. The novel secondary cylindrical battery according to claim 1, characterized in that: The welding track when the welding zone is welded to the coil core is linear or curved or a combination of linear and curved, or one or more of these, and there is at least one welding track.

3. The novel secondary cylindrical battery according to claim 2, characterized in that: A first explosion-proof mechanism is provided on the cover plate assembly, and a second explosion-proof mechanism is provided in the explosion-proof area at the center of the bottom cover of the shell.

4. The novel secondary cylindrical battery according to claim 3, characterized in that: The first explosion-proof mechanism is an explosion-proof valve.

5. The novel secondary cylindrical battery according to claim 4, characterized in that: The shell is a columnar structure with an opening on one side.

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