Cylindrical battery

Abstract

The utility model discloses a cylindrical battery which comprises a cylindrical shell, a negative current collector, a cylindrical battery cell and a positive current collector, the positive end of the cylindrical shell is a closed end, and the negative end of the cylindrical shell is an open end; the negative current collector is arranged at the open end of the cylindrical shell, the cylindrical battery core is packaged in the cylindrical shell, and the positive current collector is arranged in the closed end of the cylindrical shell; a negative pole and a positive pole are arranged on the negative current collector, the negative pole is circular, and a straight slot is formed in the upper end surface of the negative pole; the positive pole is square, and a cross groove is formed in the upper end face of the positive pole. According to the utility model, the square positive pole and the circular negative pole are positioned at the same end and are obviously distinguished in structural form, so that the positive pole and the negative pole can be quickly identified, the condition of short circuit in battery assembly is effectively avoided, and potential safety hazards are completely eradicated.

Description

Technical Field

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

[0002] In traditional cylindrical batteries, the positive and negative terminals are located at the same end. When batteries are connected in series or parallel to form battery packs with different voltages and capacities, the positive and negative terminals need to be distinguished before welding. However, in cylindrical batteries, the positive and negative terminals at the same end are all of the same structural form. When connecting batteries in series or parallel via busbars, the identical structure makes it difficult to identify and distinguish the positive and negative terminals, which can easily lead to short circuits and sparks between batteries, damaging the batteries and posing safety hazards. Furthermore, the internal welding of cylindrical batteries requires a stable structure to ensure maximum contact area and reduce connection resistance.

[0003] Therefore, a cylindrical battery is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a cylindrical battery to solve the technical problem that traditional cylindrical batteries have the same structure for both positive and negative terminals, making them difficult to identify and distinguish, which can easily lead to short circuits and battery damage.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A cylindrical battery includes a cylindrical casing, a negative current collector, a cylindrical cell, and a positive current collector. The positive terminal of the cylindrical casing is a closed end, and the negative terminal of the cylindrical casing is an open end. The negative current collector is disposed at the open end of the cylindrical casing, the cylindrical cell is encapsulated inside the cylindrical casing, and the positive current collector is disposed inside the closed end of the cylindrical casing. The negative current collector is provided with a negative electrode post and a positive electrode post.

[0007] The aforementioned negative electrode post is circular, with a slot on its upper surface; the aforementioned positive electrode post is square, with a cross slot on its upper surface.

[0008] As a further embodiment of this utility model, the negative electrode current collector includes a substrate and a lower plastic component located between the substrate and the cylindrical cell. The lower plastic component is provided with a current collector bending component, and the current collector bending component is provided with a negative electrode post that passes through the lower plastic component and the substrate. The negative electrode post that passes through the lower plastic component is located in an upper plastic component disposed on the substrate. A sealing ring is fitted on the negative electrode post below the upper plastic component. A negative electrode upper pressure plate is provided at the top of the upper plastic component, and the negative electrode post passes through the negative electrode upper pressure plate.

[0009] As a further embodiment of this utility model, the lower end face of the current collector bending component is located on the cylindrical battery cell, the middle section of the current collector bending component is Z-shaped inside the lower plastic component, and the upper end face of the current collector bending component is connected to the lower end face of the negative electrode post; both the center of the lower end face of the current collector bending component and the center of the middle section of the current collector bending component are provided with through holes.

[0010] As a further embodiment of this utility model, the lower plastic part is provided with inner groove 1 and inner groove 2 on both sides, which sink to the lower end face of the manifold bending part. The middle section of the manifold bending part is located between inner groove 1 and inner groove 2. Both inner groove 1 and inner groove 2 are provided with several overflow holes at their bottoms.

[0011] As a preferred embodiment of this utility model, both the upper plastic part on the substrate and the upper pressure plate of the negative electrode are circular.

[0012] As a further preferred embodiment of this utility model, a liquid injection hole is provided on the substrate above the first inner groove, an explosion-proof valve is provided on the substrate above the second inner groove, and an air hole is provided at the bottom of the second inner groove corresponding to the explosion-proof valve.

[0013] Compared with the prior art, the cylindrical battery provided by this utility model has the following advantages: the square positive terminal and the circular negative terminal in the cylindrical battery are located at the same end, and their shapes and structures are clearly different, which can quickly identify the positive and negative terminals, making it suitable for mature fully automated production, effectively avoiding misalignment and short circuits, and eliminating safety hazards; the structural form of this utility model improves the stability of this utility model. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 This is an exploded structural diagram of an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the negative electrode current collector in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the lower plastic part in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the current collector bending component in an embodiment of this utility model.

[0020] Figure label:

[0021] 1- Cylindrical outer shell;

[0022] 2-Negative electrode current collector; 20-Substrate; 21-Lower plastic part; 22-Current collector bending part; 23-Negative electrode post; 24-Upper plastic part; 25-Negative electrode upper pressure plate;

[0023] 221-Through hole; 211-Inner groove one; 212-Inner groove two; 210-Overflow hole; 201-Injection hole; 202-Explosion-proof valve; 231-Sealing ring; 213-Air hole;

[0024] 3-Cylindrical cell; 4-Positive terminal; 5-Positive current collector. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0028] See appendix Figure 1-2 As shown, this utility model embodiment provides a cylindrical battery, including a cylindrical shell 1, a negative current collector 2, a cylindrical cell 3, and a positive current collector 9. The positive end of the cylindrical shell 1 is a closed end, and the positive current collector 9 is disposed inside the closed end of the cylindrical shell 1. The negative end of the cylindrical shell 1 is an open end, and the negative current collector 2 is disposed at the open end of the cylindrical shell 1. The cylindrical cell 3 is encapsulated inside the cylindrical shell 1. The negative current collector 2 is provided with a negative electrode post 23 and a positive electrode post 4.

[0029] During welding assembly, the positive current collector 9 is inserted into the closed end of the cylindrical shell 1 for welding, the cylindrical cell 3 is encapsulated inside the cylindrical shell 1, the negative current collector 2 is welded to the cylindrical cell 3, and the negative current collector 2 is sealed.

[0030] See Figure 1 As shown, the negative electrode post 23 is circular, with a slot on its upper surface; the positive electrode post 4 is square, with a cross-shaped slot on its upper surface. These different structural forms distinguish the positive and negative polarities, allowing for quick identification of the positive and negative electrode posts. This facilitates connection of the battery module to the busbar and avoids short circuits and arcing caused by incorrect placement of the positive and negative electrodes. The cylindrical battery's positive and negative terminals are designed with a flat-top structure, allowing direct connection to the module busbar on one side. This facilitates PCAK automation, improves reliability between series and parallel connections during soldering, and reduces module assembly costs.

[0031] See Figure 3 As shown, the negative current collector 2 includes a substrate 20 and a lower plastic part 21 located between the substrate 20 and the cylindrical cell 3. The lower plastic part 21 is provided with a current collector bending part 22. The current collector bending part 22 is provided with a negative electrode post 23 that passes through the lower plastic part 21 and the substrate 20. The negative electrode post 23 that passes through the lower plastic part 21 is located in an upper plastic part 24 disposed on the substrate 20. A sealing ring 231 is fitted on the negative electrode post 23 below the upper plastic part 24. A negative electrode upper pressure plate 25 is provided at the top of the upper plastic part 24. The negative electrode post 23 passes through the negative electrode upper pressure plate 25.

[0032] See Figure 5 As shown, the lower end face of the current collector bending component 22 is located on the cylindrical cell 3. The middle section of the current collector bending component 22 is Z-shaped inside the lower plastic part 21. The upper end face of the current collector bending component 22 is connected to the lower end face of the negative electrode post 23. A through hole 221 is provided at the center of the lower end face of the current collector bending component 22 and at the center of the middle section of the current collector bending component 22.

[0033] The lower end face of the current collector bending member 22 is connected to the upper end face of the cylindrical cell 3, and the upper end face of the current collector bending member 22 is connected to the lower end face of the negative electrode post 23 to improve the rate performance of this utility model.

[0034] See Figure 4 As shown, the lower plastic part 21 has two inner grooves, one 211 and the other 212, which sink to the lower end face of the current collector bending part 22. The middle section of the current collector bending part 22 is located between the inner grooves 211 and 212. The bottom of the inner grooves 211 and 212 are provided with several overflow holes 210 to improve the baking efficiency and liquid discharge efficiency of the battery.

[0035] Both the upper plastic part 24 and the upper negative electrode pressure plate 25 on the substrate 20 are circular.

[0036] An injection hole 201 is provided on the substrate 20 above the inner groove 1 211, and an explosion-proof valve 202 is provided on the substrate 20 above the inner groove 212. An air hole 213 is provided at the bottom of the inner groove 212 corresponding to the explosion-proof valve 202.

[0037] During electrolyte injection, the electrolyte enters through the injection hole 201, passes through several overflow holes 210, and enters the interior of the cylindrical outer shell 1. The through hole 221 located at the center of the lower end face of the current collector bending part 22 and the center of the middle section of the current collector bending part 22 corresponds to the center of the cylindrical battery cell 3, which facilitates the electrolyte to be injected for static lubrication. The generated gas is discharged to the outside through the vent 213 at the bottom of the inner groove 212 and the explosion-proof valve 202.

[0038] The cylindrical battery structure described above is stable. The square positive electrode post 4 and the circular negative electrode post 5 are located at the same end and have distinct structural forms, which can quickly identify the positive and negative polarities of the battery and prevent short circuits caused by incorrect mixing of the positive and negative electrodes of the battery cells during assembly.

[0039] The above description illustrates the basic principles of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The above embodiments and descriptions in the specification are only for illustrating the principles of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A cylindrical battery comprising a cylindrical outer case (1), a negative electrode current collector (2), a cylindrical battery cell (3), and a positive electrode current collector (9), characterized by: The positive end of the cylindrical shell (1) is a closed end, and the negative end of the cylindrical shell (1) is an open end; the negative current collector (2) is arranged at the open end of the cylindrical shell (1), the cylindrical battery core (3) is encapsulated inside the cylindrical shell (1), and the positive current collector (9) is arranged in the closed end of the cylindrical shell (1); the negative pole (23) and the positive pole (4) are arranged on the negative current collector (2); The negative pole (23) is circular, and a one-character groove is formed in the upper end face of the negative pole (23); the positive pole (4) is square, and a cross-shaped groove is formed in the upper end face of the positive pole (4).

2. The cylindrical battery according to claim 1, wherein: The negative current collector (2) comprises a substrate (20) and a lower plastic part (21) between the substrate (20) and the cylindrical battery core (3), the lower plastic part (21) is provided with a current collector bending part (22), the negative pole (23) penetrates through the lower plastic part (21) and the substrate (20), the negative pole (23) penetrating through the lower plastic part (21) is located in the upper plastic part (24) arranged on the substrate (20), a sealing ring (231) is sleeved on the negative pole (23) below the upper plastic part (24), the upper plastic part (24) is provided with a negative upper pressing plate (25) at the top end, and the negative pole (23) penetrates through the negative upper pressing plate (25).

3. The cylindrical battery of claim 2, wherein: The lower end face of the current collector bending part (22) is located on the cylindrical battery core (3), the middle section of the current collector bending part (22) is Z-shaped in the lower plastic part (21), and the upper end face of the current collector bending part (22) is connected with the lower end face of the negative pole (23); the center of the lower end face of the current collector bending part (22) and the center of the middle section of the current collector bending part (22) are both provided with a through hole (221).

4. The cylindrical battery according to claim 3, wherein: The two sides of the lower plastic part (21) are provided with an inner groove one (211) and an inner groove two (212) which are sunken to the lower end face of the current collector bending part (22), the middle section of the current collector bending part (22) is located between the inner groove one (211) and the inner groove two (212), and the bottoms of the inner groove one (211) and the inner groove two (212) are both provided with a plurality of overflow holes (210).

5. The cylindrical battery of claim 2, wherein: The upper plastic part (24) and the negative upper pressing plate (25) on the substrate (20) are both circular.

6. The cylindrical battery of claim 4, wherein: The substrate (20) above the inner groove one (211) is provided with a liquid injection hole (201), and the substrate (20) above the inner groove two (212) is provided with an explosion-proof valve (202), and the bottom of the inner groove two (212) corresponding to the explosion-proof valve (202) is provided with an air hole (213).

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